fix: resolve editor, batch conversion, and startup performance issues

- Remove popout preview button (HTML, JS, CSS)
- Fix Save/Save As flow for new untitled files
- Fix batch conversion menu items (wire show-batch-converter IPC)
- Add universal-convert-batch IPC handler for batch file conversion
- Lazy-load mermaid, pdfjs-dist, sidebar panels, command palette
- Switch highlight.js CSS from CDN to local
- Defer CodeMirror language extensions until first use
- Add show:false + ready-to-show for faster perceived startup
- Install mermaid as local dependency (remove CDN script tag)

.claude/settings.local.json

@@ -1,43 +0,0 @@
-{
-  "permissions": {
-    "allow": [
-      "Bash(git checkout:*)",
-      "Bash(npm install)",
-      "Bash(npm run build:*)",
-      "Bash(rmdir:*)",
-      "Bash(powershell:*)",
-      "Bash(npx electron-builder:*)",
-      "Bash(dir dist)",
-      "Bash(git tag:*)",
-      "Bash(git push:*)",
-      "Bash(gh release create:*)",
-      "Bash(gh auth:*)",
-      "Bash(gh release delete:*)",
-      "Bash(gh release list:*)",
-      "Bash(gh release upload:*)",
-      "Bash(npm install:*)",
-      "Bash(npm uninstall:*)",
-      "Bash(git add:*)",
-      "Bash(git commit:*)",
-      "Bash(npm start)",
-      "Read(//h/**)",
-      "Bash(cd:*)",
-      "Bash(npm run build:win-unsigned:*)",
-      "Bash(dir:*)",
-      "Bash(git merge:*)",
-      "Bash(timeout:*)",
-      "Bash(findstr:*)",
-      "Bash(git stash:*)",
-      "Bash(npm start:*)",
-      "Bash(gh release delete-asset:*)",
-      "Bash(git rm:*)",
-      "Bash(gh release view:*)",
-      "Bash(npm run build:linux:*)",
-      "Bash(git reset:*)",
-      "Read(//i/Template_exporter/**)",
-      "Bash(copy \"I:\\Template_exporter\\md_to_docx_converter.py\" \"H:\\Development\\pan-converter\\word-template-exporter\"\" && copy \"I:Template_exporterrequirements.txt\" \"H:Developmentpan-converterword-template-exporter\"\")",
-      "Bash(copy \"I:\\Template_exporter\\word_template.docx\" \"H:\\Development\\pan-converter\\word-template-exporter\"\")"
-    ],
-    "deny": []
-  }
-}

.continue/mcpServers/new-mcp-server.yaml

@@ -1,10 +0,0 @@
-name: New MCP server
-version: 0.0.1
-schema: v1
-mcpServers:
-  - name: New MCP server
-    command: npx
-    args:
-      - -y
-      - <your-mcp-server>
-    env: {}

.gitignore

@@ -16,3 +16,21 @@ out/
 .npm/
 .electron/
 package-lock.json
+
+# Screenshots and temp files
+*.png.bak
+Screen.png
+dark.png
+light.png
+pdf.png
+uvmodal.png
+nul
+*.tmp
+
+# Development screenshots
+pdf\ modal.png
+
+# Claude/AI development files
+.claude/
+CLAUDE.md
+agents.mdcoverage/

.prettierrc

@@ -0,0 +1,11 @@
+{
+  "semi": true,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "useTabs": false,
+  "trailingComma": "es5",
+  "bracketSpacing": true,
+  "arrowParens": "always",
+  "printWidth": 100,
+  "endOfLine": "auto"
+}

.vs/ProjectSettings.json

@@ -1,3 +0,0 @@
-{
-  "CurrentProjectSetting": null
-}

.vs/VSWorkspaceState.json

@@ -1,7 +0,0 @@
-{
-  "ExpandedNodes": [
-    ""
-  ],
-  "SelectedNode": "\\package.json",
-  "PreviewInSolutionExplorer": false
-}

.vs/pan-converter/v17/DocumentLayout.backup.json

@@ -1,41 +0,0 @@
-{
-  "Version": 1,
-  "WorkspaceRootPath": "H:\\Development\\pan-converter\\",
-  "Documents": [
-    {
-      "AbsoluteMoniker": "D:0:0:{A2FE74E1-B743-11D0-AE1A-00A0C90FFFC3}|\u003CMiscFiles\u003E|H:\\Development\\pan-converter\\package.json||{90A6B3A7-C1A3-4009-A288-E2FF89E96FA0}",
-      "RelativeMoniker": "D:0:0:{A2FE74E1-B743-11D0-AE1A-00A0C90FFFC3}|\u003CMiscFiles\u003E|solutionrelative:package.json||{90A6B3A7-C1A3-4009-A288-E2FF89E96FA0}"
-    }
-  ],
-  "DocumentGroupContainers": [
-    {
-      "Orientation": 0,
-      "VerticalTabListWidth": 256,
-      "DocumentGroups": [
-        {
-          "DockedWidth": 200,
-          "SelectedChildIndex": 0,
-          "Children": [
-            {
-              "$type": "Document",
-              "DocumentIndex": 0,
-              "Title": "package.json",
-              "DocumentMoniker": "H:\\Development\\pan-converter\\package.json",
-              "RelativeDocumentMoniker": "package.json",
-              "ToolTip": "H:\\Development\\pan-converter\\package.json",
-              "RelativeToolTip": "package.json",
-              "ViewState": "AgIAAAAAAAAAAAAAAAAAAAsAAAAqAAAAAAAAAA==",
-              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.001642|",
-              "WhenOpened": "2025-10-11T13:44:30.357Z",
-              "EditorCaption": ""
-            },
-            {
-              "$type": "Bookmark",
-              "Name": "ST:0:0:{cce594b6-0c39-4442-ba28-10c64ac7e89f}"
-            }
-          ]
-        }
-      ]
-    }
-  ]
-}

.vs/pan-converter/v17/DocumentLayout.json

@@ -1,41 +0,0 @@
-{
-  "Version": 1,
-  "WorkspaceRootPath": "H:\\Development\\pan-converter\\",
-  "Documents": [
-    {
-      "AbsoluteMoniker": "D:0:0:{A2FE74E1-B743-11D0-AE1A-00A0C90FFFC3}|\u003CMiscFiles\u003E|H:\\Development\\pan-converter\\package.json||{90A6B3A7-C1A3-4009-A288-E2FF89E96FA0}",
-      "RelativeMoniker": "D:0:0:{A2FE74E1-B743-11D0-AE1A-00A0C90FFFC3}|\u003CMiscFiles\u003E|solutionrelative:package.json||{90A6B3A7-C1A3-4009-A288-E2FF89E96FA0}"
-    }
-  ],
-  "DocumentGroupContainers": [
-    {
-      "Orientation": 0,
-      "VerticalTabListWidth": 256,
-      "DocumentGroups": [
-        {
-          "DockedWidth": 200,
-          "SelectedChildIndex": 0,
-          "Children": [
-            {
-              "$type": "Document",
-              "DocumentIndex": 0,
-              "Title": "package.json",
-              "DocumentMoniker": "H:\\Development\\pan-converter\\package.json",
-              "RelativeDocumentMoniker": "package.json",
-              "ToolTip": "H:\\Development\\pan-converter\\package.json",
-              "RelativeToolTip": "package.json",
-              "ViewState": "AgIAAAAAAAAAAAAAAAAAAAsAAAAqAAAAAAAAAA==",
-              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.001642|",
-              "WhenOpened": "2025-10-11T13:44:30.357Z",
-              "EditorCaption": ""
-            },
-            {
-              "$type": "Bookmark",
-              "Name": "ST:0:0:{cce594b6-0c39-4442-ba28-10c64ac7e89f}"
-            }
-          ]
-        }
-      ]
-    }
-  ]
-}

README.md

@@ -1,162 +1,156 @@
-# PanConverter
+# MarkdownConverter
 
-A cross-platform Markdown editor and converter powered by Pandoc.
-
-![PanConverter](assets/icon.png)
+A powerful cross-platform Markdown editor and document converter powered by Pandoc, built with Electron. 100% open-source with no proprietary dependencies.
 
 ## Features
 
-### ✨ Advanced Markdown Editor
-- 🗂️ **Tabbed Interface** - Work with multiple files simultaneously in separate tabs
-- 📝 **Rich Text Editor** - Full-featured editor with syntax highlighting and comprehensive toolbar
-- 🔍 **Find & Replace** - Powerful search and replace with match highlighting and navigation
-- 🔢 **Line Numbers** - Toggle line numbers for easier code editing and navigation
-- ↩️ **Smart Auto-Indentation** - Automatic list continuation and intelligent indentation
-- ⏪ **Undo/Redo** - Full undo/redo support with keyboard shortcuts
-- ⌨️ **Advanced Shortcuts** - Tab indentation, line selection, and smart text formatting
-- 📂 **File Association Support** - Open markdown files directly from file manager
+### Markdown Editor
+<img width="1920" height="1032" alt="image" src="https://github.com/user-attachments/assets/5f53ba94-7663-47c3-b12b-b7b8bd2645aa" />
+- **Multi-tab editing** - Work on multiple files simultaneously
+- **Live preview** - Real-time markdown rendering with syntax highlighting
+- **Dynamic splitter** - Drag to resize editor and preview panes
+- **25+ themes** - Light and dark themes including Atom One Light, Dracula, Nord, Sepia, and more
+- **Find & Replace** - Search and replace with regex support
+- **Line numbers** - Toggle line numbers in the editor
+- **Auto-save** - Automatic saving every 30 seconds
+- **Math support** - KaTeX integration for mathematical expressions
 
-### 🎨 Themes & Interface
-- 👁️ **Live Preview** - See your markdown rendered in real-time with synchronized scrolling
-- 🎨 **Multiple Themes** - Choose from Light, Dark, Solarized, Monokai, or GitHub themes
-- 💾 **Auto-Save** - Never lose your work with automatic saving every 30 seconds
-- 📊 **Enhanced Statistics** - Detailed document statistics including word count, character count, lines, paragraphs, sentences, and estimated reading time
-- 🕒 **Recent Files** - Quick access to recently opened files via File menu
-- 🧮 **Math Support** - Render mathematical expressions using KaTeX (supports $$, $, \\[\\], \\(\\) delimiters)
+### PDF Viewer & Editor
+<img width="1920" height="1032" alt="image" src="https://github.com/user-attachments/assets/f10f62be-af3d-496e-81df-37ab4f91abfd" />
 
-### 📤 Export & Conversion
-- 📄 **Enhanced PDF Export** - Robust PDF generation with multiple LaTeX engine fallbacks (XeLaTeX, PDFLaTeX, wkhtmltopdf)
-- 📄 **Document Export** - Convert to HTML, DOCX, LaTeX, RTF, ODT, EPUB, PowerPoint (PPTX), and OpenDocument Presentation (ODP)
-- 📊 **Spreadsheet Export** - Export markdown tables to CSV format for compatibility with any spreadsheet application
-- 📥 **Document Import** - Import DOCX, ODT, RTF, HTML, PDF, and presentation files to markdown
-- 📋 **Table Creation Helper** - Built-in table generator for easy markdown table creation
+- **Built-in PDF viewer** - Open and view PDF files directly in the app
+- **Page navigation** - Navigate pages with keyboard or buttons
+- **Zoom controls** - Zoom in/out, fit to width, fit to page
+- **Rotation** - Rotate pages left or right
+- **PDF Editor tools**:
+  - Merge multiple PDFs
+  - Split PDFs by page range
+  - Compress PDFs
+  - Rotate pages
+  - Delete pages
+  - Reorder pages
+  - Add watermarks
+  - Password protection
+  - Remove passwords
+  - Set permissions
 
-### 🖥️ Platform Support
-- **Cross-Platform** - Works seamlessly on Windows, macOS, and Linux
+### Export Options
+- **PDF** - Export to PDF with customizable page sizes and orientation
+- **DOCX** - Standard and Enhanced (template-based) Word export
+- **ODT** - OpenDocument format
+- **HTML** - Web-ready HTML export
+- **PowerPoint** - PPTX presentation export
+- **EPUB** - E-book format
+- **LaTeX** - Academic document format
+- **RTF** - Rich Text Format
+
+### Advanced Features
+- **Custom headers & footers** - Add headers/footers to exports with dynamic fields
+- **Page size configuration** - A3, A4, A5, B4, B5, Letter, Legal, Tabloid, or custom sizes
+- **Batch conversion** - Convert entire folders of markdown files
+- **ASCII Art Generator** - Create text banners and diagrams
+- **Word templates** - Use custom Word templates for enhanced exports
+- **Import documents** - Import from 30+ formats (DOCX, PDF, HTML, etc.)
 
 ## Installation
 
 ### Prerequisites
-- [Pandoc](https://pandoc.org/installing.html) must be installed for export functionality
-  - **Ubuntu/Debian**: `sudo apt-get install pandoc`
-  - **macOS**: `brew install pandoc`
-  - **Windows**: Download installer from Pandoc website
+- [Node.js](https://nodejs.org/) (v16 or later)
+- [Pandoc](https://pandoc.org/installing.html) (required for export functionality)
 
-### PDF Export Requirements
-For optimal PDF export, install a LaTeX engine (recommended):
-- **Ubuntu/Debian**: `sudo apt-get install texlive-xetex texlive-latex-base`
-- **macOS**: `brew install --cask mactex`
-- **Windows**: Install MiKTeX or TeX Live
-- **Alternative**: `sudo apt-get install wkhtmltopdf` (fallback option)
-
-### Download
-Download the latest release for your platform from the [Releases](https://github.com/amitwh/pan-converter/releases) page.
-
-#### Linux
-- **AppImage**: `PanConverter-1.5.0.AppImage` (universal, may require `--no-sandbox` flag)
-- **Debian Package**: `pan-converter_1.5.6_amd64.deb`
-- **Snap Package**: `pan-converter_1.5.6_amd64.snap`
-
-### Install from Source
+### Install Dependencies
 ```bash
-git clone https://github.com/amitwh/pan-converter.git
-cd pan-converter
 npm install
+```
+
+### Run the Application
+```bash
 npm start
 ```
 
-## Usage
+### Build for Distribution
+```bash
+# Windows
+npm run build:win
 
-### Basic Workflow
-1. **Write** - Use the editor to write your Markdown content
-2. **Preview** - Toggle the preview pane to see rendered output
-3. **Theme** - Choose your preferred theme from the View menu
-4. **Export** - Export your document to various formats
+# macOS
+npm run build:mac
 
-### Export Options
-- **Documents**: HTML, PDF, DOCX, LaTeX, RTF, ODT, EPUB
-- **Presentations**: PowerPoint (PPTX), OpenDocument Presentation (ODP)
-- **Spreadsheets**: CSV format for tables (compatible with Excel, LibreOffice, Google Sheets)
-- **Advanced Export Options**: Optional template support, metadata insertion, table of contents, section numbering, and PDF-specific settings
-- **Batch Conversion**: Convert entire folders of markdown files with progress tracking
-
-### Import & Conversion
-- **Import Documents**: Convert DOCX, ODT, RTF, HTML, PDF, and presentation files to Markdown
-- **Cross-Format Conversion**: Convert current file between multiple formats
-- **Smart Presentation Handling**: Automatic slide-level formatting for PPTX/ODP exports
-
-### Table Creation
-- Click the table button in the toolbar
-- Specify number of rows and columns
-- Automatically generates properly formatted Markdown tables
+# Linux
+npm run build:linux
+```
 
 ## Keyboard Shortcuts
 
-### File Operations
-- `Ctrl/Cmd + N` - New file/tab
-- `Ctrl/Cmd + T` - New tab
-- `Ctrl/Cmd + W` - Close current tab
-- `Ctrl/Cmd + Tab` - Switch to next tab
-- `Ctrl/Cmd + O` - Open file
-- `Ctrl/Cmd + S` - Save file
-- `Ctrl/Cmd + Shift + S` - Save as
-- `Ctrl/Cmd + I` - Import document
+| Action | Shortcut |
+|--------|----------|
+| New File | Ctrl+N |
+| Open File | Ctrl+O |
+| Open PDF | Ctrl+Shift+O |
+| Save | Ctrl+S |
+| Save As | Ctrl+Shift+S |
+| Export | Ctrl+E |
+| Print | Ctrl+P |
+| Find | Ctrl+F |
+| Undo | Ctrl+Z |
+| Redo | Ctrl+Shift+Z |
+| New Tab | Ctrl+T |
+| Close Tab | Ctrl+W |
+| Toggle Preview | Ctrl+Shift+P |
+| Zoom In | Ctrl+Shift++ |
+| Zoom Out | Ctrl+Shift+- |
 
-### Editor Features
-- `Ctrl/Cmd + F` - Find & Replace
-- `Ctrl/Cmd + Z` - Undo
-- `Ctrl/Cmd + Shift + Z` - Redo
-- `Tab` - Indent lines or insert 4 spaces
-- `Shift + Tab` - Outdent selected lines
-- `Enter` - Auto-continue lists with proper indentation
+## Themes
 
-### View & Navigation
-- `Ctrl/Cmd + P` - Toggle preview
-- `Ctrl/Cmd + Enter` - Toggle preview (alternative)
-- `Escape` - Close find dialog
+### Light Themes
+- Atom One Light (Default)
+- GitHub Light
+- Light
+- Solarized Light
+- Gruvbox Light
+- Ayu Light
+- Sepia
+- Paper
+- Rose Pine Dawn
+- Concrete Light
 
-## Building
+### Dark Themes
+- Dark
+- One Dark
+- Dracula
+- Nord
+- Monokai
+- Material
+- Gruvbox Dark
+- Tokyo Night
+- Palenight
+- Ayu Dark
+- Ayu Mirage
+- Oceanic Next
+- Cobalt2
+- Concrete Dark
+- Concrete Warm
 
-```bash
-# Install dependencies
-npm install
+## PDF Viewer
 
-# Generate icons
-npm run generate-icons
+Open PDF files directly in MarkdownConverter:
+- **File > Open PDF** or **Ctrl+Shift+O**
+- Navigate pages with arrow buttons or page input
+- Zoom controls: +/- buttons, Fit Width, Fit Page
+- Rotate pages left or right
+- Close PDF to return to editor
 
-# Build for current platform
-npm run build
+## Open Source
 
-# Build for specific platform
-npm run build:win    # Windows
-npm run build:mac    # macOS  
-npm run build:linux  # Linux (generates .deb, .AppImage, and .snap)
-
-# Build for all platforms
-npm run dist:all
-```
-
-## Version History
-
-- **v1.8.0** - Added enhanced Word export with template support to batch converter
-- **v1.7.9** - Enhanced Word Export with Template Support: Template-based DOCX generation with custom templates, table styling, ASCII art support, and red-colored flowchart arrows
-- **v1.5.6** - (Your release notes here)
-- **v1.5.5** - Refactored PDF export, simplified Pandoc pathing, and removed XLSX dependency.
-- **v1.3.1** - Bug fixes: Fixed file associations for double-clicking .md files, corrected 50/50 layout alignment for editor/preview panes
-- **v1.3.0** - Major update: Tabbed interface for multiple files, enhanced PDF export with LaTeX engines, fixed file associations, removed redundant converter menu, improved UI architecture
-- **v1.2.1** - Comprehensive editor enhancements: Find & Replace, Line Numbers, Undo/Redo, Auto-indentation, PowerPoint export, document conversion menu, table creation helper, spreadsheet export
-- **v1.1.0** - Added Excel/ODS spreadsheet export, updated author information, renamed to PanConverter
-- **v1.0.0** - Initial release with basic markdown editing, themes, and Pandoc export
-
-## Known Issues
-
-- AppImage may require `--no-sandbox` flag on some Linux systems
-- Windows/Mac builds require platform-specific build environments
-- Large files may cause performance issues
-
-## Contributing
-
-Contributions are welcome! Please feel free to submit a Pull Request to the [GitHub repository](https://github.com/amitwh/pan-converter).
+MarkdownConverter is 100% open-source. All dependencies are permissively licensed:
+- **Electron** - MIT License
+- **pdf-lib** - MIT License
+- **pdfjs-dist** - Apache 2.0 License
+- **marked** - MIT License
+- **highlight.js** - BSD 3-Clause License
+- **dompurify** - Apache 2.0/MIT License
+- **docx** - MIT License
+- **xlsx** - Apache 2.0 License (SheetJS Community Edition)
 
 ## License
 
@@ -164,13 +158,8 @@ MIT License - see LICENSE file for details.
 
 ## Author
 
-**Amit Haridas** - [amit.wh@gmail.com](mailto:amit.wh@gmail.com)
+Amit Haridas (amit.wh@gmail.com)
 
-## Acknowledgments
+## Version
 
-- Built with [Electron](https://www.electronjs.org/)
-- Markdown parsing by [marked](https://marked.js.org/)
-- Export functionality powered by [Pandoc](https://pandoc.org/)
-- Syntax highlighting by [highlight.js](https://highlightjs.org/)
-- Spreadsheet export by [XLSX](https://www.npmjs.com/package/xlsx)
-- HTML sanitization by [DOMPurify](https://www.npmjs.com/package/dompurify)
+v3.0.0

UPDATES.md

@@ -0,0 +1,217 @@
+# PanConverter - Updates & Changelog
+
+## Version 4.0.0 (2026-03-04)
+
+### Major Changes
+- **CodeMirror 6 Editor** — Replaced textarea with CodeMirror 6 featuring syntax highlighting, code folding, bracket matching, multiple cursors, and auto-indent
+- **Sidebar Panel System** — Collapsible sidebar with File Explorer, Git, Snippets, and Templates panels
+- **Command Palette** — Ctrl+Shift+P to search and execute all app actions
+- **Code Execution (REPL)** — Run JavaScript, Python, and Bash code blocks directly from the preview
+
+### New Features
+- Print Preview dialog with paper size, orientation, margins, scale, and page range controls
+- Image paste from clipboard and drag-drop support with auto-save to assets folder
+- Document templates library (10 templates: blog post, meeting notes, tech spec, changelog, README, project plan, API docs, tutorial, release notes, comparison)
+- Markdown extensions: footnotes, admonitions (note/warning/tip/danger/info), and [[toc]] table of contents
+- PlantUML diagram rendering alongside Mermaid
+- Welcome tab with onboarding and "What's New" feature showcase
+- System spell checking with context menu suggestions and dictionary support
+- Enhanced status bar with word count, character count, line/column, encoding, and language mode
+- Grouped toolbar with visual section separators
+- Breadcrumb bar showing current file path
+
+### New Export/Import Formats
+- Reveal.js slides (.html)
+- Beamer slides (.pdf)
+- Confluence/Jira wiki markup (.txt)
+- MOBI e-books (via Calibre)
+- Developer formats: JSON, YAML, XML, TOML
+
+### Security
+- Content Security Policy (CSP) meta tag
+- File size validation (50MB limit)
+- Error message sanitization (stripped file paths)
+- Conversion rate limiting (2-second debounce)
+
+### Dependencies Updated
+- marked: 16.x to 17.x (with marked-highlight extension)
+- pdfjs-dist: 3.x to 5.x (new worker model)
+- html2pdf.js: 0.10 to 0.14
+- pdfkit: 0.14 to 0.17
+- dompurify, docx, and others updated to latest
+
+### Testing
+- 80 tests across 7 test suites
+- New tests for sidebar manager, command palette, print preview, markdown extensions, and utility functions
+
+### Breaking Changes
+- Editor is now CodeMirror 6 (replaces textarea)
+- marked API changed to use marked.use() instead of marked.setOptions()
+- pdfjs-dist upgraded to v5 with new worker model
+
+---
+
+## Version 2.1.0 (December 14, 2025)
+
+### 🎨 UI/UX Improvements
+
+#### Subtle & Small Preview Popout Button
+- Redesigned popout button with minimalist aesthetic
+- Removed border for cleaner appearance
+- Reduced size: 11px font, 2px×6px padding (previously 14px font, 4px×8px padding)
+- Added opacity transition: 50% when idle, 100% on hover
+- Subtle background effect on hover instead of heavy border styling
+- **File**: `src/styles.css:195-211`
+
+#### Simplified Table Headers in Preview
+- Removed gradient background from table headers in modern theme
+- Changed from `var(--primary-gradient)` (purple gradient) to simple light gray (#f0f0f0)
+- Updated text color to dark (#333333) for better readability
+- Clean, professional appearance matching standard themes
+- **File**: `src/styles-modern.css:445-449`
+
+### 📥 Enhanced Import Capabilities
+
+#### Comprehensive Format-to-Markdown Conversion
+Dramatically expanded the "Import Document" feature to support 30+ file formats:
+
+**Supported Formats:**
+- **Documents**: DOCX, ODT, RTF, HTML, HTM, TEX, EPUB, PDF, TXT
+- **Presentations**: PPTX, ODP
+- **Markup Languages**: RST, Textile, MediaWiki, Org-mode, AsciiDoc, TWiki, OPML
+- **E-book Formats**: EPUB, FB2
+- **LaTeX Formats**: TEX, LATEX, LTX
+- **Web Formats**: HTML, HTM, XHTML
+- **Wiki Formats**: MediaWiki, DokuWiki, TikiWiki, TWiki
+- **Data Formats**: CSV, TSV, JSON
+
+**Format-Specific Optimizations:**
+- PDF text extraction with XeLaTeX engine
+- CSV/TSV automatic table conversion
+- JSON structure handling
+- Improved error messages with format hints
+
+**Access**: File → Import Document (Ctrl+I)
+**File**: `src/main.js:1933-1994`
+
+### 🎨 Exhaustive ASCII Art Generator
+
+#### 5 New Text Banner Styles
+Complete alphabet (A-Z) and numbers (0-9) support for all styles:
+
+1. **Standard** - Classic ASCII art with slashes and underscores
+2. **Banner** - Large format using # characters (7-line height)
+3. **Block** - Modern Unicode block characters (█ ╔ ╗ ═ ║)
+4. **Bubble** - Circular bubble letters (Ⓐ Ⓑ Ⓒ)
+5. **Digital** - Digital display style (▄ ▀ ▐ ▌)
+
+**File**: `src/renderer.js:3397-3537`
+
+#### 19 Professional ASCII Templates
+Organized into 4 categories with expanded options:
+
+**Arrows & Flow (4 templates):**
+- Arrow Right - Horizontal flow indicators
+- Arrow Down - Vertical flow indicators
+- Decision - Binary decision diagrams
+- Process Flow - Multi-step process visualization
+
+**Diagrams & Charts (6 templates):**
+- Flowchart - Advanced flowchart with decision branches and loops
+- Sequence - Sequence diagrams for User-System-Database interactions
+- Network - Server-client network topology
+- Hierarchy - Organizational tree structures
+- Timeline - Milestone visualization with dates
+- Table Simple - Basic table template with borders
+
+**Boxes & Containers (4 templates):**
+- Header - Section header with decorative borders
+- Note Box - Important notes with rounded corners (┏━━┓)
+- Warning Box - Warning messages with bold borders (╔═══╗)
+- Info Box - Information boxes with subtle styling (╭───╮)
+
+**Decorative Elements (6 templates):**
+- Divider - Horizontal section separator (═══)
+- Separator Fancy - Elegant rounded divider
+- Brackets - Japanese-style brackets 【 】
+- Banner Stars - Star-bordered banners
+- Checklist - Task lists with ✓ checkmarks
+- Progress Bar - Visual progress indicators
+
+**Features:**
+- All ASCII art automatically wrapped in code blocks for proper rendering
+- Preserved formatting in markdown preview and all export formats
+- Categorized template selection interface
+- Real-time preview generation
+
+**Access**: Tools → ASCII Art Generator
+**Files**: `src/renderer.js:3513-3671`, `src/index.html:427-466`
+
+### 📝 Technical Improvements
+
+- Enhanced ASCII art detection in Word template exporter
+- Improved monospace font rendering across all export formats
+- Better code block preservation in PDF and Word exports
+- Optimized template categorization and organization
+
+### 🔧 Files Modified
+
+- `src/styles.css` - Preview popout button styling
+- `src/styles-modern.css` - Table header simplification
+- `src/main.js` - Enhanced import function, version update
+- `src/renderer.js` - ASCII art generator enhancements
+- `src/index.html` - ASCII template UI organization
+- `package.json` - Version bump to 2.1.0
+
+---
+
+## Version 2.0.0 (Previous Release)
+
+### Major Features
+- Export Profiles - Save and reuse export configurations
+- Mermaid.js diagram support
+- Command Palette (Ctrl+Shift+P)
+- GitHub Light/Dark preview themes
+- Table Generator
+- ASCII Art Generator (basic)
+- Resizable Preview Pane
+- Pop-out Preview Window
+- Configurable page sizes (A3-A5, B4-B5, Letter, Legal, Tabloid, Custom)
+- Custom Headers & Footers for exports
+- Enhanced PDF and Word export with templates
+- 22 beautiful themes
+
+### Core Capabilities
+- Cross-platform markdown editor with live preview
+- Universal document conversion (30+ formats)
+- PDF Editor (merge, split, compress, rotate, watermark, encrypt)
+- Batch file conversion
+- File association support
+- Advanced export options
+- Multi-tab interface
+
+---
+
+## Installation & Usage
+
+### Prerequisites
+- **Pandoc** - Required for document conversion
+- **Optional**: LibreOffice, ImageMagick, FFmpeg for universal converter
+
+### Download
+Get the latest release from: https://github.com/amitwh/pan-converter/releases
+
+### Supported Platforms
+- Windows (x64)
+- Linux (AppImage, .deb, .snap)
+- macOS (planned)
+
+---
+
+## Contributing
+
+Contributions are welcome! Please see [CLAUDE.md](CLAUDE.md) for development guidelines.
+
+**Author**: Amit Haridas (amit.wh@gmail.com)
+**License**: MIT
+**Repository**: https://github.com/amitwh/pan-converter

assets/icon.svg

@@ -1,8 +0,0 @@
-<svg width="256" height="256" viewBox="0 0 256 256" xmlns="http://www.w3.org/2000/svg">
-  <rect width="256" height="256" rx="32" fill="#4A90E2"/>
-  <g transform="translate(40, 40)">
-    <path d="M20 40 L20 136 L80 136 L80 100 L56 100 L56 76 L80 76 L80 40 Z" fill="white" opacity="0.9"/>
-    <path d="M96 40 L96 136 L156 136 L156 100 L132 100 L132 88 L156 88 L156 52 L132 52 L132 40 Z" fill="white" opacity="0.9"/>
-  </g>
-  <text x="128" y="200" font-family="Arial, sans-serif" font-size="24" font-weight="bold" text-anchor="middle" fill="white">PAN</text>
-</svg>

eslint.config.js

@@ -0,0 +1,111 @@
+/**
+ * ESLint Configuration for PanConverter
+ * Uses flat config format (ESLint 9+)
+ */
+
+module.exports = [
+  {
+    // Global ignores
+    ignores: [
+      'node_modules/**',
+      'dist/**',
+      'coverage/**',
+      '*.min.js'
+    ]
+  },
+  {
+    // JavaScript files
+    files: ['**/*.js'],
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: 'module',
+      globals: {
+        // Node.js
+        require: 'readonly',
+        module: 'readonly',
+        exports: 'readonly',
+        __dirname: 'readonly',
+        __filename: 'readonly',
+        process: 'readonly',
+        Buffer: 'readonly',
+        console: 'readonly',
+        setTimeout: 'readonly',
+        setInterval: 'readonly',
+        clearTimeout: 'readonly',
+        clearInterval: 'readonly',
+        // Browser
+        window: 'readonly',
+        document: 'readonly',
+        localStorage: 'readonly',
+        alert: 'readonly',
+        prompt: 'readonly',
+        confirm: 'readonly',
+        Event: 'readonly',
+        CustomEvent: 'readonly',
+        HTMLElement: 'readonly',
+        MutationObserver: 'readonly',
+        TextEncoder: 'readonly',
+        FileReader: 'readonly',
+        requestAnimationFrame: 'readonly',
+        cancelAnimationFrame: 'readonly',
+        navigator: 'readonly',
+        location: 'readonly',
+        fetch: 'readonly',
+        URL: 'readonly',
+        Blob: 'readonly',
+        Image: 'readonly',
+        DragEvent: 'readonly',
+        ClipboardEvent: 'readonly',
+        KeyboardEvent: 'readonly',
+        MouseEvent: 'readonly',
+        NodeList: 'readonly',
+        HTMLInputElement: 'readonly',
+        HTMLTextAreaElement: 'readonly',
+        getComputedStyle: 'readonly',
+        // Electron
+        electronAPI: 'readonly',
+        // Libraries
+        marked: 'readonly',
+        DOMPurify: 'readonly',
+        hljs: 'readonly',
+        mermaid: 'readonly',
+        // Node.js global object
+        global: 'writable',
+        // Jest
+        jest: 'readonly',
+        describe: 'readonly',
+        test: 'readonly',
+        expect: 'readonly',
+        beforeEach: 'readonly',
+        afterEach: 'readonly',
+        beforeAll: 'readonly',
+        afterAll: 'readonly'
+      }
+    },
+    rules: {
+      // Error prevention
+      'no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
+      'no-undef': 'error',
+      'no-console': 'off', // Allow console for Electron apps
+
+      // Code quality
+      'eqeqeq': ['warn', 'always'],
+      'no-var': 'warn',
+      'prefer-const': 'warn',
+
+      // Style (handled by Prettier)
+      'semi': 'off',
+      'quotes': 'off',
+      'indent': 'off',
+
+      // Async handling
+      'no-async-promise-executor': 'warn',
+      'require-await': 'off',
+
+      // Security
+      'no-eval': 'error',
+      'no-implied-eval': 'error',
+      'no-new-func': 'error'
+    }
+  }
+];

jest.config.js

@@ -0,0 +1,61 @@
+/**
+ * Jest Configuration for PanConverter
+ * @version 2.2.0
+ */
+
+module.exports = {
+  // Test environment
+  testEnvironment: 'jsdom',
+
+  // Root directory
+  rootDir: '.',
+
+  // Test file patterns
+  testMatch: [
+    '**/tests/**/*.test.js',
+    '**/tests/**/*.spec.js'
+  ],
+
+  // Coverage configuration
+  collectCoverageFrom: [
+    'src/**/*.js',
+    '!src/main.js', // Main process needs electron-mock
+    '!src/renderer.js', // Large renderer file with duplicate declarations
+    '!src/preload.js', // Electron preload requires contextBridge
+    '!**/node_modules/**'
+  ],
+
+  // Coverage thresholds (raised with expanded test suite)
+  coverageThreshold: {
+    global: {
+      branches: 10,
+      functions: 15,
+      lines: 15,
+      statements: 15
+    }
+  },
+
+  // Transform settings (no transpilation needed for vanilla JS)
+  transform: {},
+
+  // Module paths
+  moduleDirectories: ['node_modules', 'src'],
+
+  // Setup files
+  setupFilesAfterEnv: ['<rootDir>/tests/setup.js'],
+
+  // Ignore patterns
+  testPathIgnorePatterns: [
+    '/node_modules/',
+    '/dist/'
+  ],
+
+  // Verbose output
+  verbose: true,
+
+  // Clear mocks between tests
+  clearMocks: true,
+
+  // Reset modules between tests
+  resetModules: true
+};

package.json

@@ -1,13 +1,20 @@
 {
-  "name": "pan-converter",
-  "version": "1.9.0",
-  "description": "Cross-platform Markdown editor and converter using Pandoc",
+  "name": "markdown-converter",
+  "version": "4.0.0",
+  "description": "Professional Markdown editor and universal file converter with PDF editing, batch processing, and syntax highlighting",
   "main": "src/main.js",
   "scripts": {
     "start": "electron .",
-    "test": "echo \"Error: no test specified\" && exit 1",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:coverage": "jest --coverage",
+    "lint": "eslint src tests",
+    "lint:fix": "eslint src tests --fix",
+    "format": "prettier --write src tests",
+    "format:check": "prettier --check src tests",
     "build": "electron-builder",
-    "build:win": "cross-env CSC_LINK=code-signing-cert.pfx CSC_KEY_PASSWORD=PanConverter2024! electron-builder --win",
+    "build:win": "electron-builder --win",
+    "build:win-signed": "cross-env CSC_LINK=code-signing-cert.pfx CSC_KEY_PASSWORD=%CSC_KEY_PASSWORD% electron-builder --win",
     "build:win-unsigned": "cross-env CSC_IDENTITY_AUTO_DISCOVERY=false electron-builder --win",
     "build:mac": "electron-builder --mac",
     "build:linux": "electron-builder --linux",
@@ -19,35 +26,69 @@
     "markdown",
     "pandoc",
     "converter",
-    "editor"
+    "editor",
+    "pdf",
+    "audio",
+    "video",
+    "image"
   ],
-  "author": "Amit Haridas <amit.wh@gmail.com>",
+  "author": "ConcreteInfo <amit.wh@gmail.com>",
   "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/amitwh/markdown-converter"
+  },
   "devDependencies": {
+    "@testing-library/dom": "^10.4.1",
     "cross-env": "^10.0.0",
     "electron": "^37.4.0",
     "electron-builder": "^26.0.12",
+    "eslint": "^9.39.2",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-prettier": "^5.5.4",
+    "jest": "^30.2.0",
+    "jest-environment-jsdom": "^30.2.0",
+    "prettier": "^3.7.4",
     "sharp": "^0.34.3"
   },
   "dependencies": {
+    "@codemirror/autocomplete": "^6.20.1",
+    "@codemirror/commands": "^6.10.2",
+    "@codemirror/lang-css": "^6.3.1",
+    "@codemirror/lang-html": "^6.4.11",
+    "@codemirror/lang-javascript": "^6.2.5",
+    "@codemirror/lang-json": "^6.0.2",
+    "@codemirror/lang-markdown": "^6.5.0",
+    "@codemirror/lang-python": "^6.2.1",
+    "@codemirror/language": "^6.12.2",
+    "@codemirror/lint": "^6.9.5",
+    "@codemirror/search": "^6.6.0",
+    "@codemirror/state": "^6.5.4",
+    "@codemirror/theme-one-dark": "^6.1.3",
+    "@codemirror/view": "^6.39.16",
     "codemirror": "^6.0.2",
     "core-util-is": "^1.0.3",
-    "docx": "^9.5.1",
+    "docx": "^9.6.0",
     "docx4js": "^3.3.0",
-    "dompurify": "^3.2.6",
+    "dompurify": "^3.3.1",
     "electron-store": "^10.1.0",
     "highlight.js": "^11.11.1",
-    "html2pdf.js": "^0.10.1",
-    "marked": "^16.2.1",
+    "html2pdf.js": "^0.14.0",
+    "marked": "^17.0.3",
+    "marked-footnote": "^1.4.0",
+    "marked-highlight": "^2.2.3",
+    "mermaid": "^11.12.3",
     "pdf-lib": "^1.17.1",
-    "pdfkit": "^0.14.0",
+    "pdfjs-dist": "^5.5.207",
+    "pdfkit": "^0.17.2",
     "pizzip": "^3.2.0",
+    "simple-git": "^3.32.3",
     "tslib": "^2.8.1",
     "xlsx": "^0.18.5"
   },
   "build": {
-    "appId": "com.panconverter.app",
-    "productName": "PanConverter",
+    "appId": "com.concreteinfo.markdownconverter",
+    "productName": "MarkdownConverter",
     "directories": {
       "output": "dist"
     },
@@ -73,10 +114,18 @@
         "description": "Markdown Document",
         "mimeType": "text/markdown",
         "role": "Editor"
+      },
+      {
+        "ext": "pdf",
+        "name": "PDF Document",
+        "description": "PDF Document",
+        "mimeType": "application/pdf",
+        "role": "Editor"
       }
     ],
     "mac": {
-      "category": "public.app-category.productivity"
+      "category": "public.app-category.productivity",
+      "identity": null
     },
     "win": {
       "target": [
@@ -110,7 +159,7 @@
       "displayLanguageSelector": true,
       "createDesktopShortcut": true,
       "createStartMenuShortcut": true,
-      "shortcutName": "PanConverter",
+      "shortcutName": "MarkdownConverter",
       "runAfterFinish": true,
       "menuCategory": "Productivity",
       "license": "LICENSE",
@@ -123,16 +172,29 @@
       "target": [
         "deb",
         "AppImage",
-        "snap"
+        "snap",
+        "rpm"
       ],
-      "category": "Utility"
+      "category": "Utility",
+      "maintainer": "ConcreteInfo <amit.wh@gmail.com>"
     },
     "deb": {
       "depends": [
-        "pandoc"
+        "pandoc",
+        "ffmpeg",
+        "imagemagick",
+        "libreoffice-common"
       ],
-      "description": "Markdown editor and converter using Pandoc",
-      "maintainer": "Amit Haridas <amit.wh@gmail.com>"
+      "description": "Professional Markdown editor and universal file converter",
+      "maintainer": "ConcreteInfo <amit.wh@gmail.com>"
+    },
+    "rpm": {
+      "depends": [
+        "pandoc",
+        "ffmpeg",
+        "ImageMagick",
+        "libreoffice-core"
+      ]
     }
   }
 }

scripts/generate-icons.js

@@ -1,43 +1,82 @@
+/**
+ * Icon Generator for MarkdownConverter
+ * Generates all required icon sizes from NewIcon.jpg
+ */
+
 const sharp = require('sharp');
 const fs = require('fs');
 const path = require('path');
 
-const sizes = {
-    'icon.png': 512,
-    'icon@2x.png': 1024,
-    'icon.ico': 256,
-    'icon.icns': 512
-};
+// Source image
+const sourceImage = path.join(__dirname, '..', 'assets', 'docico1.png');
+const assetsDir = path.join(__dirname, '..', 'assets');
 
-const svgPath = path.join(__dirname, '..', 'assets', 'icon.svg');
-const svgBuffer = fs.readFileSync(svgPath);
+// Icon sizes needed for different platforms
+const iconSizes = [16, 24, 32, 48, 64, 128, 256, 512, 1024];
 
 async function generateIcons() {
-    for (const [filename, size] of Object.entries(sizes)) {
-        const outputPath = path.join(__dirname, '..', 'assets', filename);
+  console.log('Generating icons from docico1.png...');
 
-        if (filename.endsWith('.png')) {
-            await sharp(svgBuffer)
-                .resize(size, size)
-                .png()
-                .toFile(outputPath);
-            console.log(`Generated ${filename}`);
-        } else if (filename.endsWith('.ico')) {
-            // For ICO, we'll just use the PNG version
-            await sharp(svgBuffer)
-                .resize(size, size)
-                .png()
-                .toFile(outputPath.replace('.ico', '.png'));
-            console.log(`Generated ${filename.replace('.ico', '.png')} (use png2ico to convert)`);
-        } else if (filename.endsWith('.icns')) {
-            // For ICNS, we'll just use the PNG version
-            await sharp(svgBuffer)
-                .resize(size, size)
-                .png()
-                .toFile(outputPath.replace('.icns', '.png'));
-            console.log(`Generated ${filename.replace('.icns', '.png')} (use png2icns to convert)`);
-        }
+  // Check if source exists
+  if (!fs.existsSync(sourceImage)) {
+    console.error('Source image not found:', sourceImage);
+    process.exit(1);
+  }
+
+  try {
+    // Generate main icon.png (512x512)
+    await sharp(sourceImage)
+      .resize(512, 512, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
+      .png()
+      .toFile(path.join(assetsDir, 'icon.png'));
+    console.log('Generated icon.png (512x512)');
+
+    // Generate icon@2x.png (1024x1024)
+    await sharp(sourceImage)
+      .resize(1024, 1024, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
+      .png()
+      .toFile(path.join(assetsDir, 'icon@2x.png'));
+    console.log('Generated icon@2x.png (1024x1024)');
+
+    // Create icons directory for multi-size icons
+    const iconsDir = path.join(assetsDir, 'icons');
+    if (!fs.existsSync(iconsDir)) {
+      fs.mkdirSync(iconsDir, { recursive: true });
     }
+
+    // Generate all sizes
+    for (const size of iconSizes) {
+      await sharp(sourceImage)
+        .resize(size, size, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
+        .png()
+        .toFile(path.join(iconsDir, `${size}x${size}.png`));
+      console.log(`Generated icons/${size}x${size}.png`);
+    }
+
+    // Generate favicon
+    await sharp(sourceImage)
+      .resize(32, 32, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
+      .png()
+      .toFile(path.join(assetsDir, 'favicon.png'));
+    console.log('Generated favicon.png (32x32)');
+
+    // Generate tray icon (smaller, for system tray)
+    await sharp(sourceImage)
+      .resize(24, 24, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
+      .png()
+      .toFile(path.join(assetsDir, 'tray-icon.png'));
+    console.log('Generated tray-icon.png (24x24)');
+
+    console.log('\nIcon generation complete!');
+    console.log('\nFor Windows .ico file, use an online converter or:');
+    console.log('  magick convert assets/icons/*.png assets/icon.ico');
+    console.log('\nFor macOS .icns file, use:');
+    console.log('  iconutil -c icns assets/icon.iconset -o assets/icon.icns');
+
+  } catch (error) {
+    console.error('Error generating icons:', error);
+    process.exit(1);
+  }
 }
 
-generateIcons().catch(console.error);
+generateIcons();

src/ascii-generator.html

@@ -0,0 +1,601 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>ASCII Art Generator - MarkdownConverter</title>
+    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap" rel="stylesheet">
+    <style>
+        :root {
+            --ci-dark-gray: #464646;
+            --ci-medium-gray: #9a9696;
+            --ci-accent: #e5461f;
+            --ci-light-gray: #e3e3e3;
+            --ci-black: #0d0b09;
+            --ci-white: #ffffff;
+            --ci-bg: #f5f5f5;
+        }
+
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+        }
+
+        body {
+            font-family: 'Inter', system-ui, sans-serif;
+            background: var(--ci-bg);
+            color: var(--ci-dark-gray);
+            min-height: 100vh;
+        }
+
+        .header {
+            background: linear-gradient(135deg, var(--ci-dark-gray) 0%, var(--ci-black) 100%);
+            padding: 16px 24px;
+            border-bottom: 3px solid var(--ci-accent);
+            display: flex;
+            align-items: center;
+            justify-content: space-between;
+        }
+
+        .header h1 {
+            color: var(--ci-white);
+            font-size: 1.25rem;
+            font-weight: 600;
+        }
+
+        .container {
+            padding: 24px;
+            max-width: 100%;
+        }
+
+        .section {
+            background: var(--ci-white);
+            border-radius: 12px;
+            padding: 20px;
+            margin-bottom: 20px;
+            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
+        }
+
+        .section-title {
+            font-weight: 600;
+            margin-bottom: 16px;
+            color: var(--ci-dark-gray);
+            font-size: 0.95rem;
+        }
+
+        .mode-tabs {
+            display: flex;
+            gap: 8px;
+            margin-bottom: 20px;
+        }
+
+        .mode-tab {
+            padding: 10px 20px;
+            border: 2px solid var(--ci-light-gray);
+            background: var(--ci-white);
+            border-radius: 8px;
+            font-size: 0.875rem;
+            font-weight: 500;
+            cursor: pointer;
+            transition: all 0.2s;
+        }
+
+        .mode-tab:hover {
+            border-color: var(--ci-accent);
+        }
+
+        .mode-tab.active {
+            background: var(--ci-accent);
+            border-color: var(--ci-accent);
+            color: var(--ci-white);
+        }
+
+        .form-group {
+            margin-bottom: 16px;
+        }
+
+        .form-label {
+            display: block;
+            font-size: 0.875rem;
+            font-weight: 500;
+            margin-bottom: 8px;
+            color: var(--ci-dark-gray);
+        }
+
+        .form-input, .form-select, .form-textarea {
+            width: 100%;
+            padding: 10px 14px;
+            border: 2px solid var(--ci-light-gray);
+            border-radius: 8px;
+            font-size: 0.875rem;
+            font-family: inherit;
+            transition: border-color 0.2s;
+        }
+
+        .form-input:focus, .form-select:focus, .form-textarea:focus {
+            outline: none;
+            border-color: var(--ci-accent);
+        }
+
+        .form-textarea {
+            min-height: 80px;
+            resize: vertical;
+        }
+
+        .preview-container {
+            background: var(--ci-black);
+            border-radius: 8px;
+            padding: 16px;
+            min-height: 200px;
+            max-height: 350px;
+            overflow: auto;
+        }
+
+        .preview-content {
+            font-family: 'JetBrains Mono', monospace;
+            font-size: 12px;
+            line-height: 1.3;
+            color: #00ff00;
+            white-space: pre;
+        }
+
+        .template-grid {
+            display: grid;
+            grid-template-columns: repeat(4, 1fr);
+            gap: 8px;
+            margin-bottom: 16px;
+        }
+
+        .template-btn {
+            padding: 8px 12px;
+            border: 2px solid var(--ci-light-gray);
+            background: var(--ci-white);
+            border-radius: 6px;
+            font-size: 0.75rem;
+            cursor: pointer;
+            transition: all 0.2s;
+        }
+
+        .template-btn:hover {
+            border-color: var(--ci-accent);
+            background: rgba(229, 70, 31, 0.05);
+        }
+
+        .template-btn.active {
+            border-color: var(--ci-accent);
+            background: rgba(229, 70, 31, 0.1);
+        }
+
+        .footer {
+            display: flex;
+            justify-content: flex-end;
+            gap: 12px;
+            padding: 16px 24px;
+            background: var(--ci-white);
+            border-top: 1px solid var(--ci-light-gray);
+            position: sticky;
+            bottom: 0;
+        }
+
+        .btn {
+            padding: 10px 24px;
+            border-radius: 8px;
+            font-size: 0.875rem;
+            font-weight: 500;
+            cursor: pointer;
+            transition: all 0.2s;
+            border: none;
+        }
+
+        .btn-primary {
+            background: var(--ci-accent);
+            color: var(--ci-white);
+        }
+
+        .btn-primary:hover {
+            background: #c93a18;
+            transform: translateY(-1px);
+        }
+
+        .btn-secondary {
+            background: var(--ci-light-gray);
+            color: var(--ci-dark-gray);
+        }
+
+        .btn-secondary:hover {
+            background: #d0d0d0;
+        }
+
+        .mode-section {
+            display: none;
+        }
+
+        .mode-section.active {
+            display: block;
+        }
+
+        .template-category {
+            margin-bottom: 16px;
+        }
+
+        .template-category-title {
+            font-size: 0.8rem;
+            color: var(--ci-medium-gray);
+            margin-bottom: 8px;
+            text-transform: uppercase;
+            letter-spacing: 0.05em;
+        }
+    </style>
+</head>
+<body>
+    <div class="header">
+        <h1>ASCII Art Generator</h1>
+    </div>
+
+    <div class="container">
+        <div class="section">
+            <div class="mode-tabs">
+                <button class="mode-tab active" data-mode="text">Text Banner</button>
+                <button class="mode-tab" data-mode="box">Box/Frame</button>
+                <button class="mode-tab" data-mode="templates">Templates</button>
+            </div>
+
+            <!-- Text Banner Mode -->
+            <div id="text-mode" class="mode-section active">
+                <div class="form-group">
+                    <label class="form-label">Text to Convert</label>
+                    <input type="text" id="text-input" class="form-input" placeholder="Enter your text..." maxlength="30">
+                </div>
+                <div class="form-group">
+                    <label class="form-label">Style</label>
+                    <select id="font-style" class="form-select">
+                        <option value="standard">Standard</option>
+                        <option value="banner">Banner</option>
+                        <option value="block">Block</option>
+                        <option value="bubble">Bubble</option>
+                        <option value="digital">Digital</option>
+                    </select>
+                </div>
+            </div>
+
+            <!-- Box/Frame Mode -->
+            <div id="box-mode" class="mode-section">
+                <div class="form-group">
+                    <label class="form-label">Text Content</label>
+                    <textarea id="box-text" class="form-textarea" placeholder="Enter text for the box..."></textarea>
+                </div>
+                <div class="form-group">
+                    <label class="form-label">Box Style</label>
+                    <select id="box-style" class="form-select">
+                        <option value="single">Single Line</option>
+                        <option value="double">Double Line</option>
+                        <option value="rounded">Rounded</option>
+                        <option value="bold">Bold</option>
+                        <option value="ascii">ASCII (+|-)</option>
+                    </select>
+                </div>
+                <div class="form-group">
+                    <label class="form-label">Padding</label>
+                    <input type="number" id="box-padding" class="form-input" min="0" max="10" value="2" style="width: 100px;">
+                </div>
+            </div>
+
+            <!-- Templates Mode -->
+            <div id="templates-mode" class="mode-section">
+                <div class="template-category">
+                    <div class="template-category-title">Arrows & Flow</div>
+                    <div class="template-grid">
+                        <button class="template-btn" data-template="arrow-right">Arrow Right</button>
+                        <button class="template-btn" data-template="arrow-down">Arrow Down</button>
+                        <button class="template-btn" data-template="decision">Decision</button>
+                        <button class="template-btn" data-template="process">Process Flow</button>
+                    </div>
+                </div>
+                <div class="template-category">
+                    <div class="template-category-title">Diagrams</div>
+                    <div class="template-grid">
+                        <button class="template-btn" data-template="flowchart">Flowchart</button>
+                        <button class="template-btn" data-template="sequence">Sequence</button>
+                        <button class="template-btn" data-template="network">Network</button>
+                        <button class="template-btn" data-template="hierarchy">Hierarchy</button>
+                    </div>
+                </div>
+                <div class="template-category">
+                    <div class="template-category-title">Boxes & Containers</div>
+                    <div class="template-grid">
+                        <button class="template-btn" data-template="header">Header</button>
+                        <button class="template-btn" data-template="note">Note Box</button>
+                        <button class="template-btn" data-template="warning">Warning</button>
+                        <button class="template-btn" data-template="info">Info Box</button>
+                    </div>
+                </div>
+                <div class="template-category">
+                    <div class="template-category-title">Decorative</div>
+                    <div class="template-grid">
+                        <button class="template-btn" data-template="divider">Divider</button>
+                        <button class="template-btn" data-template="separator">Separator</button>
+                        <button class="template-btn" data-template="banner">Banner</button>
+                        <button class="template-btn" data-template="checklist">Checklist</button>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <div class="section">
+            <div class="section-title">Preview</div>
+            <div class="preview-container">
+                <div id="preview" class="preview-content"></div>
+            </div>
+        </div>
+    </div>
+
+    <div class="footer">
+        <button class="btn btn-secondary" id="btn-generate">Generate Preview</button>
+        <button class="btn btn-primary" id="btn-insert">Insert to Editor</button>
+    </div>
+
+    <script>
+        // ASCII Art Generator Logic
+        const FONTS = {
+            standard: {
+                height: 5,
+                chars: {
+                    'A': ['  /\\  ', ' /  \\ ', '/----\\', '|    |', '|    |'],
+                    'B': ['|----\\', '|    |', '|----/', '|    \\', '|----/'],
+                    'C': ['/----\\', '|     ', '|     ', '|     ', '\\----/'],
+                    'D': ['|----\\', '|    |', '|    |', '|    |', '|----/'],
+                    'E': ['|----', '|    ', '|--- ', '|    ', '|----'],
+                    'F': ['|----', '|    ', '|--- ', '|    ', '|    '],
+                    'G': ['/----\\', '|     ', '| |--\\', '|    |', '\\----/'],
+                    'H': ['|    |', '|    |', '|----/', '|    |', '|    |'],
+                    'I': ['|---|', '  |  ', '  |  ', '  |  ', '|---|'],
+                    'J': ['    |', '    |', '    |', '|   |', '\\---/'],
+                    'K': ['|   /', '|  / ', '|--  ', '|  \\ ', '|   \\'],
+                    'L': ['|    ', '|    ', '|    ', '|    ', '|----'],
+                    'M': ['|\\  /|', '| \\/ |', '|    |', '|    |', '|    |'],
+                    'N': ['|\\   |', '| \\  |', '|  \\ |', '|   \\|', '|    |'],
+                    'O': ['/----\\', '|    |', '|    |', '|    |', '\\----/'],
+                    'P': ['|----\\', '|    |', '|----/', '|     ', '|     '],
+                    'Q': ['/----\\', '|    |', '|  \\ |', '|   \\|', '\\----\\'],
+                    'R': ['|----\\', '|    |', '|----/', '|  \\  ', '|   \\ '],
+                    'S': ['/----\\', '|     ', '\\----\\', '     |', '\\----/'],
+                    'T': ['-----', '  |  ', '  |  ', '  |  ', '  |  '],
+                    'U': ['|    |', '|    |', '|    |', '|    |', '\\----/'],
+                    'V': ['|    |', '|    |', ' \\  / ', '  \\/  ', '      '],
+                    'W': ['|    |', '|    |', '|    |', '| /\\ |', '|/  \\|'],
+                    'X': ['\\    /', ' \\  / ', '  \\/  ', '  /\\  ', ' /  \\ '],
+                    'Y': ['\\   /', ' \\ / ', '  |  ', '  |  ', '  |  '],
+                    'Z': ['-----', '   / ', '  /  ', ' /   ', '-----'],
+                    ' ': ['     ', '     ', '     ', '     ', '     '],
+                    '0': ['/---\\', '|   |', '| / |', '|/  |', '\\---/'],
+                    '1': ['  /| ', ' / | ', '   | ', '   | ', ' ----'],
+                    '2': ['/---\\', '    |', ' ---/', '/    ', '-----'],
+                    '3': ['----\\', '    |', ' ---/', '    |', '----/'],
+                    '4': ['|   |', '|   |', '-----', '    |', '    |'],
+                    '5': ['-----', '|    ', '----\\', '    |', '----/'],
+                    '6': ['/----', '|    ', '|---\\', '|   |', '\\---/'],
+                    '7': ['-----', '   / ', '  /  ', ' /   ', '/    '],
+                    '8': ['/---\\', '|   |', ' --- ', '|   |', '\\---/'],
+                    '9': ['/---\\', '|   |', '\\----', '    |', '----/']
+                }
+            },
+            banner: {
+                height: 7,
+                chars: {
+                    'A': [' ##### ', ' ##   ##', '##     ##', '#########', '##     ##', '##     ##', '##     ##'],
+                    'B': ['######## ', '##     ##', '##     ##', '######## ', '##     ##', '##     ##', '######## '],
+                    'C': [' ###### ', '##    ##', '##      ', '##      ', '##      ', '##    ##', ' ###### '],
+                    'D': ['######## ', '##     ##', '##     ##', '##     ##', '##     ##', '##     ##', '######## '],
+                    'E': ['########', '##      ', '##      ', '###### ', '##      ', '##      ', '########'],
+                    'F': ['########', '##      ', '##      ', '###### ', '##      ', '##      ', '##      '],
+                    'G': [' ###### ', '##    ##', '##      ', '##  ####', '##    ##', '##    ##', ' ###### '],
+                    'H': ['##     ##', '##     ##', '##     ##', '#########', '##     ##', '##     ##', '##     ##'],
+                    'I': ['####', ' ## ', ' ## ', ' ## ', ' ## ', ' ## ', '####'],
+                    'J': ['      ##', '      ##', '      ##', '      ##', '##    ##', '##    ##', ' ###### '],
+                    'K': ['##    ##', '##   ## ', '##  ##  ', '#####   ', '##  ##  ', '##   ## ', '##    ##'],
+                    'L': ['##      ', '##      ', '##      ', '##      ', '##      ', '##      ', '########'],
+                    'M': ['##     ##', '###   ###', '#### ####', '## ### ##', '##     ##', '##     ##', '##     ##'],
+                    'N': ['##    ##', '###   ##', '####  ##', '## ## ##', '##  ####', '##   ###', '##    ##'],
+                    'O': [' ####### ', '##     ##', '##     ##', '##     ##', '##     ##', '##     ##', ' ####### '],
+                    'P': ['######## ', '##     ##', '##     ##', '######## ', '##       ', '##       ', '##       '],
+                    'Q': [' ####### ', '##     ##', '##     ##', '##     ##', '##  ## ##', '##    ## ', ' ##### ##'],
+                    'R': ['######## ', '##     ##', '##     ##', '######## ', '##   ##  ', '##    ## ', '##     ##'],
+                    'S': [' ###### ', '##    ##', '##      ', ' ###### ', '      ##', '##    ##', ' ###### '],
+                    'T': ['########', '   ##   ', '   ##   ', '   ##   ', '   ##   ', '   ##   ', '   ##   '],
+                    'U': ['##     ##', '##     ##', '##     ##', '##     ##', '##     ##', '##     ##', ' ####### '],
+                    'V': ['##     ##', '##     ##', '##     ##', '##     ##', ' ##   ## ', '  ## ##  ', '   ###   '],
+                    'W': ['##      ##', '##  ##  ##', '##  ##  ##', '##  ##  ##', '##  ##  ##', '##  ##  ##', ' ###  ### '],
+                    'X': ['##     ##', ' ##   ## ', '  ## ##  ', '   ###   ', '  ## ##  ', ' ##   ## ', '##     ##'],
+                    'Y': ['##    ##', ' ##  ## ', '  ####  ', '   ##   ', '   ##   ', '   ##   ', '   ##   '],
+                    'Z': ['########', '     ## ', '    ##  ', '   ##   ', '  ##    ', ' ##     ', '########'],
+                    ' ': ['       ', '       ', '       ', '       ', '       ', '       ', '       '],
+                    '0': [' ###### ', '##    ##', '##    ##', '##    ##', '##    ##', '##    ##', ' ###### '],
+                    '1': ['   ##   ', ' ####   ', '   ##   ', '   ##   ', '   ##   ', '   ##   ', ' ###### '],
+                    '2': [' ###### ', '##    ##', '     ## ', '   ##   ', '  ##    ', ' ##     ', '########'],
+                    '3': [' ###### ', '##    ##', '     ## ', '  ####  ', '     ## ', '##    ##', ' ###### '],
+                    '4': ['    ##  ', '   ###  ', '  # ##  ', ' #  ##  ', '########', '    ##  ', '    ##  '],
+                    '5': ['########', '##      ', '####### ', '      ##', '      ##', '##    ##', ' ###### '],
+                    '6': [' ###### ', '##      ', '####### ', '##    ##', '##    ##', '##    ##', ' ###### '],
+                    '7': ['########', '##   ## ', '    ##  ', '   ##   ', '  ##    ', '  ##    ', '  ##    '],
+                    '8': [' ###### ', '##    ##', '##    ##', ' ###### ', '##    ##', '##    ##', ' ###### '],
+                    '9': [' ###### ', '##    ##', '##    ##', ' #######', '      ##', '##    ##', ' ###### ']
+                }
+            },
+            block: {
+                height: 6,
+                chars: {
+                    'A': ['█████╗ ', '██╔══██╗', '███████║', '██╔══██║', '██║  ██║', '╚═╝  ╚═╝'],
+                    'B': ['██████╗ ', '██╔══██╗', '██████╔╝', '██╔══██╗', '██████╔╝', '╚═════╝ '],
+                    'C': ['█████╗ ', '██╔══██╗', '██║     ', '██║     ', '╚█████╔╝', ' ╚════╝ '],
+                    'D': ['██████╗ ', '██╔══██╗', '██║  ██║', '██║  ██║', '██████╔╝', '╚═════╝ '],
+                    'E': ['███████╗', '██╔════╝', '█████╗  ', '██╔══╝  ', '███████╗', '╚══════╝'],
+                    'F': ['███████╗', '██╔════╝', '█████╗  ', '██╔══╝  ', '██║     ', '╚═╝     '],
+                    'G': ['█████╗ ', '██╔══██╗', '██║  ███', '██║   ██', '╚█████╔╝', ' ╚════╝ '],
+                    'H': ['██╗  ██╗', '██║  ██║', '███████║', '██╔══██║', '██║  ██║', '╚═╝  ╚═╝'],
+                    'I': ['██╗', '██║', '██║', '██║', '██║', '╚═╝'],
+                    'J': ['    ██╗', '    ██║', '    ██║', '██  ██║', '╚████╔╝', ' ╚═══╝ '],
+                    'K': ['██╗  ██╗', '██║ ██╔╝', '█████╔╝ ', '██╔═██╗ ', '██║  ██╗', '╚═╝  ╚═╝'],
+                    'L': ['██╗     ', '██║     ', '██║     ', '██║     ', '███████╗', '╚══════╝'],
+                    'M': ['███╗   ███╗', '████╗ ████║', '██╔████╔██║', '██║╚██╔╝██║', '██║ ╚═╝ ██║', '╚═╝     ╚═╝'],
+                    'N': ['███╗   ██╗', '████╗  ██║', '██╔██╗ ██║', '██║╚██╗██║', '██║ ╚████║', '╚═╝  ╚═══╝'],
+                    'O': ['█████╗ ', '██╔══██╗', '██║  ██║', '██║  ██║', '╚█████╔╝', ' ╚════╝ '],
+                    'P': ['██████╗ ', '██╔══██╗', '██████╔╝', '██╔═══╝ ', '██║     ', '╚═╝     '],
+                    'Q': ['█████╗ ', '██╔══██╗', '██║  ██║', '██║  ██║', '╚██████╗', ' ╚═══██╝'],
+                    'R': ['██████╗ ', '██╔══██╗', '██████╔╝', '██╔══██╗', '██║  ██║', '╚═╝  ╚═╝'],
+                    'S': ['█████╗ ', '██╔══╝ ', '█████╗ ', '╚══██║ ', '█████║ ', '╚════╝ '],
+                    'T': ['████████╗', '╚══██╔══╝', '   ██║   ', '   ██║   ', '   ██║   ', '   ╚═╝   '],
+                    'U': ['██╗  ██╗', '██║  ██║', '██║  ██║', '██║  ██║', '╚█████╔╝', ' ╚════╝ '],
+                    'V': ['██╗   ██╗', '██║   ██║', '██║   ██║', '╚██╗ ██╔╝', ' ╚████╔╝ ', '  ╚═══╝  '],
+                    'W': ['██╗    ██╗', '██║    ██║', '██║ █╗ ██║', '██║███╗██║', '╚███╔███╔╝', ' ╚══╝╚══╝ '],
+                    'X': ['██╗  ██╗', '╚██╗██╔╝', ' ╚███╔╝ ', ' ██╔██╗ ', '██╔╝ ██╗', '╚═╝  ╚═╝'],
+                    'Y': ['██╗   ██╗', '╚██╗ ██╔╝', ' ╚████╔╝ ', '  ╚██╔╝  ', '   ██║   ', '   ╚═╝   '],
+                    'Z': ['███████╗', '╚════██║', '  ███╔═╝', ' ██╔══╝ ', '███████╗', '╚══════╝'],
+                    ' ': ['   ', '   ', '   ', '   ', '   ', '   ']
+                }
+            }
+        };
+
+        const TEMPLATES = {
+            'arrow-right': '    ┌─────────────────────┐\n──▶│  Process or Action  │──▶\n    └─────────────────────┘',
+            'arrow-down': '        │\n        ▼\n┌───────────────┐\n│   Process     │\n└───────────────┘\n        │\n        ▼',
+            'decision': '       ╱╲\n      ╱  ╲\n     ╱ ?  ╲\n    ╱      ╲\n   ╱────────╲\n  ╱          ╲\n YES        NO\n  │          │\n  ▼          ▼',
+            'process': '┌─────┐   ┌─────┐   ┌─────┐\n│  1  │──▶│  2  │──▶│  3  │\n└─────┘   └─────┘   └─────┘',
+            'flowchart': '┌─────────────┐\n│   START    │\n└──────┬──────┘\n       │\n       ▼\n┌─────────────┐\n│  Process A  │\n└──────┬──────┘\n       │\n       ▼\n   ╱────────╲\n  ╱ Decision ╲\n  ╲    ?    ╱\n   ╲────────╱\n    │      │\n   YES    NO\n    │      │\n    ▼      ▼\n┌──────┐ ┌──────┐\n│  B   │ │  C   │\n└──────┘ └──────┘',
+            'sequence': ' User      System     Database\n   │           │           │\n   │  Request  │           │\n   ├──────────►│           │\n   │           │  Query    │\n   │           ├──────────►│\n   │           │           │\n   │           │  Result   │\n   │           │◄──────────┤\n   │  Response │           │\n   │◄──────────┤           │\n   │           │           │',
+            'network': '          ┌─────────┐\n          │ Server  │\n          └────┬────┘\n               │\n     ┌─────────┼─────────┐\n     │         │         │\n┌────┴────┐ ┌──┴──┐ ┌────┴────┐\n│ Client1 │ │ DB  │ │ Client2 │\n└─────────┘ └─────┘ └─────────┘',
+            'hierarchy': '            ┌─────────┐\n            │   CEO   │\n            └────┬────┘\n       ┌─────────┼─────────┐\n       │         │         │\n   ┌───┴───┐ ┌───┴───┐ ┌───┴───┐\n   │  VP1  │ │  VP2  │ │  VP3  │\n   └───┬───┘ └───┬───┘ └───┬───┘\n       │         │         │\n   ┌───┴───┐ ┌───┴───┐ ┌───┴───┐\n   │ Team1 │ │ Team2 │ │ Team3 │\n   └───────┘ └───────┘ └───────┘',
+            'header': '╔════════════════════════════════════╗\n║            SECTION TITLE           ║\n╚════════════════════════════════════╝',
+            'note': '┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓\n┃  NOTE:                         ┃\n┃  This is an important note     ┃\n┃  that requires attention!      ┃\n┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛',
+            'warning': '╔════════════════════════════════════╗\n║  ⚠️  WARNING                       ║\n║                                    ║\n║  Critical information here!        ║\n╚════════════════════════════════════╝',
+            'info': '╭────────────────────────────────────╮\n│  ℹ️  INFO                          │\n│                                    │\n│  Helpful information here.         │\n╰────────────────────────────────────╯',
+            'divider': '════════════════════════════════════════',
+            'separator': '╭──────────────────────────────────────╮\n│                                      │\n╰──────────────────────────────────────╯',
+            'banner': '★══════════════════════════════════════★\n║          YOUR TITLE HERE            ║\n★══════════════════════════════════════★',
+            'checklist': '☐ Task 1 - Not completed\n☑ Task 2 - Completed  \n☐ Task 3 - Not completed\n☐ Task 4 - Not completed'
+        };
+
+        const BOX_STYLES = {
+            single: { tl: '┌', tr: '┐', bl: '└', br: '┘', h: '─', v: '│' },
+            double: { tl: '╔', tr: '╗', bl: '╚', br: '╝', h: '═', v: '║' },
+            rounded: { tl: '╭', tr: '╮', bl: '╰', br: '╯', h: '─', v: '│' },
+            bold: { tl: '┏', tr: '┓', bl: '┗', br: '┛', h: '━', v: '┃' },
+            ascii: { tl: '+', tr: '+', bl: '+', br: '+', h: '-', v: '|' }
+        };
+
+        let currentMode = 'text';
+        let currentTemplate = null;
+
+        // Mode switching
+        document.querySelectorAll('.mode-tab').forEach(tab => {
+            tab.addEventListener('click', () => {
+                document.querySelectorAll('.mode-tab').forEach(t => t.classList.remove('active'));
+                tab.classList.add('active');
+                currentMode = tab.dataset.mode;
+
+                document.querySelectorAll('.mode-section').forEach(s => s.classList.remove('active'));
+                document.getElementById(currentMode + '-mode').classList.add('active');
+
+                generatePreview();
+            });
+        });
+
+        // Template selection
+        document.querySelectorAll('.template-btn').forEach(btn => {
+            btn.addEventListener('click', () => {
+                document.querySelectorAll('.template-btn').forEach(b => b.classList.remove('active'));
+                btn.classList.add('active');
+                currentTemplate = btn.dataset.template;
+                generatePreview();
+            });
+        });
+
+        // Generate text banner
+        function generateTextBanner(text, style) {
+            const font = FONTS[style] || FONTS.standard;
+            const lines = Array(font.height).fill('');
+
+            for (const char of text.toUpperCase()) {
+                const charArt = font.chars[char] || font.chars[' '];
+                if (charArt) {
+                    for (let i = 0; i < font.height; i++) {
+                        lines[i] += charArt[i] + ' ';
+                    }
+                }
+            }
+
+            return lines.join('\n');
+        }
+
+        // Generate box
+        function generateBox(text, style, padding) {
+            const box = BOX_STYLES[style] || BOX_STYLES.single;
+            const lines = text.split('\n');
+            const maxLen = Math.max(...lines.map(l => l.length)) + padding * 2;
+
+            let result = box.tl + box.h.repeat(maxLen + 2) + box.tr + '\n';
+
+            // Add padding lines at top
+            for (let i = 0; i < Math.floor(padding / 2); i++) {
+                result += box.v + ' '.repeat(maxLen + 2) + box.v + '\n';
+            }
+
+            // Add text lines
+            for (const line of lines) {
+                const paddedLine = ' '.repeat(padding) + line.padEnd(maxLen - padding) + ' ';
+                result += box.v + ' ' + paddedLine + box.v + '\n';
+            }
+
+            // Add padding lines at bottom
+            for (let i = 0; i < Math.floor(padding / 2); i++) {
+                result += box.v + ' '.repeat(maxLen + 2) + box.v + '\n';
+            }
+
+            result += box.bl + box.h.repeat(maxLen + 2) + box.br;
+            return result;
+        }
+
+        // Generate preview
+        function generatePreview() {
+            let result = '';
+
+            if (currentMode === 'text') {
+                const text = document.getElementById('text-input').value || 'HELLO';
+                const style = document.getElementById('font-style').value;
+                result = generateTextBanner(text, style);
+            } else if (currentMode === 'box') {
+                const text = document.getElementById('box-text').value || 'Your text here';
+                const style = document.getElementById('box-style').value;
+                const padding = parseInt(document.getElementById('box-padding').value) || 2;
+                result = generateBox(text, style, padding);
+            } else if (currentMode === 'templates') {
+                result = currentTemplate ? TEMPLATES[currentTemplate] : 'Select a template...';
+            }
+
+            document.getElementById('preview').textContent = result;
+        }
+
+        // Event listeners for live preview
+        document.getElementById('text-input').addEventListener('input', generatePreview);
+        document.getElementById('font-style').addEventListener('change', generatePreview);
+        document.getElementById('box-text').addEventListener('input', generatePreview);
+        document.getElementById('box-style').addEventListener('change', generatePreview);
+        document.getElementById('box-padding').addEventListener('input', generatePreview);
+
+        document.getElementById('btn-generate').addEventListener('click', generatePreview);
+
+        document.getElementById('btn-insert').addEventListener('click', () => {
+            const content = document.getElementById('preview').textContent;
+            if (content && window.electronAPI) {
+                // Wrap in code block for markdown
+                const wrapped = '```\n' + content + '\n```';
+                window.electronAPI.send('insert-generated-content', wrapped);
+                window.close();
+            }
+        });
+
+        // Initial preview
+        generatePreview();
+    </script>
+</body>
+</html>

src/command-palette.js

@@ -0,0 +1,109 @@
+class CommandPalette {
+    constructor() {
+        this.overlay = document.getElementById('command-palette-overlay');
+        this.input = document.getElementById('command-palette-input');
+        this.results = document.getElementById('command-palette-results');
+        this.commands = [];
+        this.selectedIndex = 0;
+        this.filteredCommands = [];
+        this.setupEventListeners();
+    }
+
+    register(label, shortcut, action) {
+        this.commands.push({ label, shortcut, action });
+    }
+
+    open() {
+        this.overlay.classList.remove('hidden');
+        this.input.value = '';
+        this.input.focus();
+        this.selectedIndex = 0;
+        this.renderResults('');
+    }
+
+    close() {
+        this.overlay.classList.add('hidden');
+    }
+
+    isOpen() {
+        return !this.overlay.classList.contains('hidden');
+    }
+
+    setupEventListeners() {
+        this.input.addEventListener('input', () => {
+            this.selectedIndex = 0;
+            this.renderResults(this.input.value);
+        });
+
+        this.overlay.addEventListener('click', (e) => {
+            if (e.target === this.overlay) this.close();
+        });
+
+        this.input.addEventListener('keydown', (e) => {
+            if (e.key === 'Escape') {
+                e.preventDefault();
+                this.close();
+            } else if (e.key === 'Enter') {
+                e.preventDefault();
+                this.executeSelected();
+            } else if (e.key === 'ArrowDown') {
+                e.preventDefault();
+                this.selectedIndex = Math.min(this.selectedIndex + 1, this.filteredCommands.length - 1);
+                this.updateSelection();
+            } else if (e.key === 'ArrowUp') {
+                e.preventDefault();
+                this.selectedIndex = Math.max(this.selectedIndex - 1, 0);
+                this.updateSelection();
+            }
+        });
+    }
+
+    renderResults(query) {
+        this.filteredCommands = query
+            ? this.commands.filter(cmd => cmd.label.toLowerCase().includes(query.toLowerCase()))
+            : [...this.commands];
+
+        this.results.innerHTML = this.filteredCommands.map((cmd, i) => `
+            <div class="command-item ${i === this.selectedIndex ? 'selected' : ''}" data-index="${i}">
+                <span class="command-label">${this.highlightMatch(cmd.label, query)}</span>
+                ${cmd.shortcut ? `<span class="command-shortcut">${cmd.shortcut}</span>` : ''}
+            </div>
+        `).join('');
+
+        this.results.querySelectorAll('.command-item').forEach((el) => {
+            el.addEventListener('click', () => {
+                const idx = parseInt(el.dataset.index);
+                this.filteredCommands[idx].action();
+                this.close();
+            });
+            el.addEventListener('mouseenter', () => {
+                this.selectedIndex = parseInt(el.dataset.index);
+                this.updateSelection();
+            });
+        });
+    }
+
+    highlightMatch(text, query) {
+        if (!query) return text;
+        const regex = new RegExp(`(${query.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')})`, 'gi');
+        return text.replace(regex, '<strong>$1</strong>');
+    }
+
+    updateSelection() {
+        this.results.querySelectorAll('.command-item').forEach((el, i) => {
+            el.classList.toggle('selected', i === this.selectedIndex);
+        });
+        // Scroll selected into view
+        const selected = this.results.querySelector('.command-item.selected');
+        if (selected) selected.scrollIntoView({ block: 'nearest' });
+    }
+
+    executeSelected() {
+        if (this.filteredCommands[this.selectedIndex]) {
+            this.filteredCommands[this.selectedIndex].action();
+            this.close();
+        }
+    }
+}
+
+module.exports = { CommandPalette };

src/editor/codemirror-setup.js

@@ -0,0 +1,123 @@
+// CodeMirror 6 wrapper module
+// Provides createEditor() and getLanguageExtension() for the rest of the app.
+
+const {
+  EditorView,
+  keymap,
+  lineNumbers,
+  highlightActiveLine,
+  drawSelection,
+} = require('@codemirror/view');
+const { EditorState } = require('@codemirror/state');
+const { markdown, markdownLanguage } = require('@codemirror/lang-markdown');
+// Language extensions loaded lazily on first use
+let _javascript, _html, _css, _json, _python;
+const {
+  defaultKeymap,
+  history,
+  historyKeymap,
+  indentWithTab,
+} = require('@codemirror/commands');
+const {
+  searchKeymap,
+  highlightSelectionMatches,
+} = require('@codemirror/search');
+const {
+  autocompletion,
+  completionKeymap,
+} = require('@codemirror/autocomplete');
+const {
+  bracketMatching,
+  foldGutter,
+  indentOnInput,
+} = require('@codemirror/language');
+const { oneDark } = require('@codemirror/theme-one-dark');
+
+/**
+ * Create a CodeMirror 6 editor instance.
+ *
+ * @param {HTMLElement} parentElement - DOM element to mount the editor in
+ * @param {Object}  options
+ * @param {string}  options.content          - initial document content (default '')
+ * @param {Function} options.onChange        - called with new content string on every doc change
+ * @param {Function} options.onUpdate       - called with the EditorView on every update (selection, doc change, etc.)
+ * @param {boolean} options.isDark           - apply oneDark theme when true (default false)
+ * @param {boolean} options.showLineNumbers  - show line-number gutter (default true)
+ * @returns {EditorView} the created editor view
+ */
+function createEditor(parentElement, options = {}) {
+  const {
+    content = '',
+    onChange = () => {},
+    onUpdate = null,
+    isDark = false,
+    showLineNumbers = true,
+  } = options;
+
+  const extensions = [
+    markdown({ base: markdownLanguage }),
+    history(),
+    drawSelection(),
+    highlightActiveLine(),
+    bracketMatching(),
+    indentOnInput(),
+    highlightSelectionMatches(),
+    autocompletion(),
+    foldGutter(),
+    keymap.of([
+      ...defaultKeymap,
+      ...historyKeymap,
+      ...searchKeymap,
+      ...completionKeymap,
+      indentWithTab,
+    ]),
+    EditorView.updateListener.of((update) => {
+      if (update.docChanged) {
+        onChange(update.state.doc.toString());
+      }
+      if (onUpdate && (update.docChanged || update.selectionSet)) {
+        onUpdate(update.view);
+      }
+    }),
+    EditorView.lineWrapping,
+  ];
+
+  if (showLineNumbers) {
+    extensions.push(lineNumbers());
+  }
+
+  if (isDark) {
+    extensions.push(oneDark);
+  }
+
+  const state = EditorState.create({ doc: content, extensions });
+  const view = new EditorView({ state, parent: parentElement });
+  return view;
+}
+
+/**
+ * Return the appropriate CodeMirror language extension for a given language name.
+ *
+ * Supported values: javascript, js, html, css, json, python, py, markdown.
+ * Falls back to markdown when the language is unrecognised.
+ *
+ * @param {string} lang - language identifier
+ * @returns {Extension} CodeMirror language extension
+ */
+function getLanguageExtension(lang) {
+  const loaders = {
+    javascript: () => { if (!_javascript) _javascript = require('@codemirror/lang-javascript').javascript; return _javascript(); },
+    html: () => { if (!_html) _html = require('@codemirror/lang-html').html; return _html(); },
+    css: () => { if (!_css) _css = require('@codemirror/lang-css').css; return _css(); },
+    json: () => { if (!_json) _json = require('@codemirror/lang-json').json; return _json(); },
+    python: () => { if (!_python) _python = require('@codemirror/lang-python').python; return _python(); },
+    markdown: () => markdown({ base: markdownLanguage }),
+  };
+  loaders.js = loaders.javascript;
+  loaders.py = loaders.python;
+
+  const loader = loaders[lang];
+  return loader ? loader() : markdown({ base: markdownLanguage });
+}
+
+module.exports = { createEditor, getLanguageExtension };

src/fonts.css

@@ -0,0 +1,75 @@
+/* Local Font Definitions for MarkdownConverter */
+
+/* Inter Font Family */
+@font-face {
+    font-family: 'Inter';
+    font-style: normal;
+    font-weight: 300;
+    font-display: swap;
+    src: url('../assets/fonts/Inter-Light.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'Inter';
+    font-style: normal;
+    font-weight: 400;
+    font-display: swap;
+    src: url('../assets/fonts/Inter-Regular.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'Inter';
+    font-style: normal;
+    font-weight: 500;
+    font-display: swap;
+    src: url('../assets/fonts/Inter-Medium.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'Inter';
+    font-style: normal;
+    font-weight: 600;
+    font-display: swap;
+    src: url('../assets/fonts/Inter-SemiBold.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'Inter';
+    font-style: normal;
+    font-weight: 700;
+    font-display: swap;
+    src: url('../assets/fonts/Inter-Bold.woff2') format('woff2');
+}
+
+/* JetBrains Mono Font Family - For code, markdown editor, and ASCII art */
+@font-face {
+    font-family: 'JetBrains Mono';
+    font-style: normal;
+    font-weight: 400;
+    font-display: swap;
+    src: url('../assets/fonts/JetBrainsMono-Regular.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'JetBrains Mono';
+    font-style: normal;
+    font-weight: 500;
+    font-display: swap;
+    src: url('../assets/fonts/JetBrainsMono-Medium.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'JetBrains Mono';
+    font-style: normal;
+    font-weight: 600;
+    font-display: swap;
+    src: url('../assets/fonts/JetBrainsMono-SemiBold.woff2') format('woff2');
+}
+
+@font-face {
+    font-family: 'JetBrains Mono';
+    font-style: normal;
+    font-weight: 700;
+    font-display: swap;
+    src: url('../assets/fonts/JetBrainsMono-Bold.woff2') format('woff2');
+}

src/index.html

@@ -2,18 +2,29 @@
 <html lang="en">
 <head>
     <meta charset="UTF-8">
+    <meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdn.jsdelivr.net; style-src 'self' 'unsafe-inline' https://cdnjs.cloudflare.com; img-src 'self' data: blob: file:; font-src 'self' data:; connect-src 'self' https://www.plantuml.com;">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>PanConverter - Markdown Editor</title>
-    <link rel="preconnect" href="https://fonts.googleapis.com">
-    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
-    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap" rel="stylesheet">
+    <title>MarkdownConverter</title>
+    <link rel="stylesheet" href="fonts.css">
     <link rel="stylesheet" href="styles.css">
     <link rel="stylesheet" href="styles-modern.css">
-    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/6.65.7/codemirror.min.css">
-    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/default.min.css">
+    <link rel="stylesheet" href="styles-concreteinfo.css">
+    <link rel="stylesheet" href="styles-sidebar.css">
+    <link rel="stylesheet" href="styles-welcome.css">
+    <link rel="stylesheet" href="../node_modules/highlight.js/styles/default.css">
 </head>
 <body>
     <div class="container">
+        <!-- App Header with ConcreteInfo Logo -->
+        <div class="app-header" id="app-header">
+            <div class="app-header-left">
+                <img src="../assets/logo.png" alt="MarkdownConverter" class="app-logo" id="app-logo">
+                <span class="app-title">MarkdownConverter</span>
+            </div>
+            <div class="app-header-right">
+                <span class="app-version">v4.0.0</span>
+            </div>
+        </div>
         <div class="tab-bar" id="tab-bar">
             <div class="tab active" data-tab-id="1">
                 <span class="tab-title">Untitled</span>
@@ -22,105 +33,122 @@
             <button class="new-tab-button" id="new-tab-btn" title="New tab">+</button>
         </div>
         <div class="toolbar">
-            <button id="btn-bold" title="Bold">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <path d="M6 4h8a4 4 0 0 1 4 4 4 4 0 0 1-4 4H6z"></path>
-                    <path d="M6 12h9a4 4 0 0 1 4 4 4 4 0 0 1-4 4H6z"></path>
-                </svg>
-            </button>
-            <button id="btn-italic" title="Italic">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <line x1="19" y1="4" x2="10" y2="4"></line>
-                    <line x1="14" y1="20" x2="5" y2="20"></line>
-                    <line x1="15" y1="4" x2="9" y2="20"></line>
-                </svg>
-            </button>
-            <button id="btn-heading" title="Heading">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <polyline points="4 7 4 4 20 4 20 7"></polyline>
-                    <line x1="9" y1="20" x2="15" y2="20"></line>
-                    <line x1="12" y1="4" x2="12" y2="20"></line>
-                </svg>
-            </button>
-            <button id="btn-link" title="Link">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path>
-                    <path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path>
-                </svg>
-            </button>
-            <button id="btn-code" title="Code">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <polyline points="16 18 22 12 16 6"></polyline>
-                    <polyline points="8 6 2 12 8 18"></polyline>
-                </svg>
-            </button>
-            <button id="btn-list" title="List">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <line x1="8" y1="6" x2="21" y2="6"></line>
-                    <line x1="8" y1="12" x2="21" y2="12"></line>
-                    <line x1="8" y1="18" x2="21" y2="18"></line>
-                    <line x1="3" y1="6" x2="3.01" y2="6"></line>
-                    <line x1="3" y1="12" x2="3.01" y2="12"></line>
-                    <line x1="3" y1="18" x2="3.01" y2="18"></line>
-                </svg>
-            </button>
-            <button id="btn-quote" title="Quote">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <path d="M3 21c3 0 7-1 7-8V5c0-1.25-.756-2.017-2-2H4c-1.25 0-2 .75-2 1.972V11c0 1.25.75 2 2 2 1 0 1 0 1 1v1c0 1-1 2-2 2s-1 .008-1 1.031V20c0 1 0 1 1 1z"></path>
-                    <path d="M15 21c3 0 7-1 7-8V5c0-1.25-.757-2.017-2-2h-4c-1.25 0-2 .75-2 1.972V11c0 1.25.75 2 2 2h.75c0 2.25.25 4-2.75 4v3c0 1 0 1 1 1z"></path>
-                </svg>
-            </button>
-            <button id="btn-table" title="Insert Table">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <rect x="3" y="3" width="18" height="18" rx="2" ry="2"></rect>
-                    <line x1="3" y1="9" x2="21" y2="9"></line>
-                    <line x1="3" y1="15" x2="21" y2="15"></line>
-                    <line x1="9" y1="3" x2="9" y2="21"></line>
-                    <line x1="15" y1="3" x2="15" y2="21"></line>
-                </svg>
-            </button>
-            <button id="btn-strikethrough" title="Strikethrough">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <path d="M16 4H9a3 3 0 0 0-2.83 4"></path>
-                    <path d="M14 12a4 4 0 0 1 0 8H6"></path>
-                    <line x1="4" y1="12" x2="20" y2="12"></line>
-                </svg>
-            </button>
-            <button id="btn-code-block" title="Code Block">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <rect x="2" y="6" width="20" height="12" rx="2"></rect>
-                    <path d="m10 10-2 2 2 2"></path>
-                    <path d="m14 10 2 2-2 2"></path>
-                </svg>
-            </button>
-            <button id="btn-horizontal-rule" title="Horizontal Rule">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <line x1="3" y1="12" x2="21" y2="12"></line>
-                    <line x1="3" y1="6" x2="21" y2="6"></line>
-                    <line x1="3" y1="18" x2="21" y2="18"></line>
-                </svg>
-            </button>
+            <div class="toolbar-group">
+                <!-- Format: Bold, Italic, Strikethrough -->
+                <button id="btn-bold" title="Bold (Ctrl+B)">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <path d="M6 4h8a4 4 0 0 1 4 4 4 4 0 0 1-4 4H6z"></path>
+                        <path d="M6 12h9a4 4 0 0 1 4 4 4 4 0 0 1-4 4H6z"></path>
+                    </svg>
+                </button>
+                <button id="btn-italic" title="Italic (Ctrl+I)">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <line x1="19" y1="4" x2="10" y2="4"></line>
+                        <line x1="14" y1="20" x2="5" y2="20"></line>
+                        <line x1="15" y1="4" x2="9" y2="20"></line>
+                    </svg>
+                </button>
+                <button id="btn-strikethrough" title="Strikethrough">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <path d="M16 4H9a3 3 0 0 0-2.83 4"></path>
+                        <path d="M14 12a4 4 0 0 1 0 8H6"></path>
+                        <line x1="4" y1="12" x2="20" y2="12"></line>
+                    </svg>
+                </button>
+            </div>
             <div class="toolbar-separator"></div>
-            <button id="btn-find" title="Find & Replace (Ctrl+F)">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <circle cx="11" cy="11" r="8"></circle>
-                    <path d="m21 21-4.35-4.35"></path>
-                </svg>
-            </button>
-            <button id="btn-line-numbers" title="Toggle Line Numbers">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <path d="M3 6h18"></path>
-                    <path d="M3 12h18"></path>
-                    <path d="M3 18h18"></path>
-                </svg>
-            </button>
+            <div class="toolbar-group">
+                <!-- Structure: Heading, List, Quote -->
+                <button id="btn-heading" title="Heading">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <polyline points="4 7 4 4 20 4 20 7"></polyline>
+                        <line x1="9" y1="20" x2="15" y2="20"></line>
+                        <line x1="12" y1="4" x2="12" y2="20"></line>
+                    </svg>
+                </button>
+                <button id="btn-list" title="List">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <line x1="8" y1="6" x2="21" y2="6"></line>
+                        <line x1="8" y1="12" x2="21" y2="12"></line>
+                        <line x1="8" y1="18" x2="21" y2="18"></line>
+                        <line x1="3" y1="6" x2="3.01" y2="6"></line>
+                        <line x1="3" y1="12" x2="3.01" y2="12"></line>
+                        <line x1="3" y1="18" x2="3.01" y2="18"></line>
+                    </svg>
+                </button>
+                <button id="btn-quote" title="Quote">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <path d="M3 21c3 0 7-1 7-8V5c0-1.25-.756-2.017-2-2H4c-1.25 0-2 .75-2 1.972V11c0 1.25.75 2 2 2 1 0 1 0 1 1v1c0 1-1 2-2 2s-1 .008-1 1.031V20c0 1 0 1 1 1z"></path>
+                        <path d="M15 21c3 0 7-1 7-8V5c0-1.25-.757-2.017-2-2h-4c-1.25 0-2 .75-2 1.972V11c0 1.25.75 2 2 2h.75c0 2.25.25 4-2.75 4v3c0 1 0 1 1 1z"></path>
+                    </svg>
+                </button>
+            </div>
             <div class="toolbar-separator"></div>
-            <button id="btn-preview-toggle" title="Toggle Preview">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"></path>
-                    <circle cx="12" cy="12" r="3"></circle>
-                </svg>
-            </button>
+            <div class="toolbar-group">
+                <!-- Insert: Link, Code, Code Block, Table, HR -->
+                <button id="btn-link" title="Link">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path>
+                        <path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path>
+                    </svg>
+                </button>
+                <button id="btn-code" title="Inline Code (Ctrl+`)">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <polyline points="16 18 22 12 16 6"></polyline>
+                        <polyline points="8 6 2 12 8 18"></polyline>
+                    </svg>
+                </button>
+                <button id="btn-code-block" title="Code Block">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <rect x="2" y="6" width="20" height="12" rx="2"></rect>
+                        <path d="m10 10-2 2 2 2"></path>
+                        <path d="m14 10 2 2-2 2"></path>
+                    </svg>
+                </button>
+                <button id="btn-table" title="Insert Table">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <rect x="3" y="3" width="18" height="18" rx="2" ry="2"></rect>
+                        <line x1="3" y1="9" x2="21" y2="9"></line>
+                        <line x1="3" y1="15" x2="21" y2="15"></line>
+                        <line x1="9" y1="3" x2="9" y2="21"></line>
+                        <line x1="15" y1="3" x2="15" y2="21"></line>
+                    </svg>
+                </button>
+                <button id="btn-horizontal-rule" title="Horizontal Rule">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <line x1="3" y1="12" x2="21" y2="12"></line>
+                        <line x1="3" y1="6" x2="21" y2="6"></line>
+                        <line x1="3" y1="18" x2="21" y2="18"></line>
+                    </svg>
+                </button>
+            </div>
+            <div class="toolbar-separator"></div>
+            <div class="toolbar-group">
+                <!-- View: Find, Line Numbers, Preview -->
+                <button id="btn-find" title="Find & Replace (Ctrl+F)">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <circle cx="11" cy="11" r="8"></circle>
+                        <path d="m21 21-4.35-4.35"></path>
+                    </svg>
+                </button>
+                <button id="btn-line-numbers" title="Toggle Line Numbers">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <path d="M3 6h18"></path>
+                        <path d="M3 12h18"></path>
+                        <path d="M3 18h18"></path>
+                    </svg>
+                </button>
+                <button id="btn-preview-toggle" title="Toggle Preview (Ctrl+Shift+P)">
+                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                        <path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"></path>
+                        <circle cx="12" cy="12" r="3"></circle>
+                    </svg>
+                </button>
+            </div>
+        </div>
+
+        <div class="breadcrumb-bar" id="breadcrumb-bar">
+            <span class="breadcrumb-path" id="breadcrumb-path">Untitled</span>
         </div>
 
         <!-- Find & Replace Dialog -->
@@ -148,6 +176,19 @@
                 </div>
                 <div class="export-dialog-body">
                     <!-- Simple/Advanced Export Toggle -->
+                    <!-- Export Profiles -->
+                    <div class="export-section export-profiles">
+                        <label>Export Profile:</label>
+                        <div class="profile-controls">
+                            <select id="export-profile-select">
+                                <option value="">Custom Settings</option>
+                            </select>
+                            <button id="save-profile-btn" type="button" title="Save current settings as profile">💾 Save</button>
+                            <button id="delete-profile-btn" type="button" title="Delete selected profile">🗑️ Delete</button>
+                        </div>
+                        <small class="export-help">Save and reuse your favorite export configurations</small>
+                    </div>
+
                     <div class="export-section export-mode-toggle">
                         <label class="checkbox-label">
                             <input type="checkbox" id="advanced-export-toggle">
@@ -243,6 +284,37 @@
                     </div> <!-- End advanced-export-options -->
 
                     <!-- Basic Export Options (always visible) -->
+                    <div class="export-section basic-options">
+                        <label>Page Size & Orientation:</label>
+                        <div class="form-row">
+                            <label for="page-size">Size:</label>
+                            <select id="page-size">
+                                <option value="a4">A4 (210×297mm)</option>
+                                <option value="a3">A3 (297×420mm)</option>
+                                <option value="a5">A5 (148×210mm)</option>
+                                <option value="b4">B4 (250×353mm)</option>
+                                <option value="b5">B5 (176×250mm)</option>
+                                <option value="letter">Letter (8.5×11in)</option>
+                                <option value="legal">Legal (8.5×14in)</option>
+                                <option value="tabloid">Tabloid (11×17in)</option>
+                                <option value="custom">Custom...</option>
+                            </select>
+                        </div>
+                        <div class="form-row">
+                            <label for="page-orientation">Orientation:</label>
+                            <select id="page-orientation">
+                                <option value="portrait">Portrait</option>
+                                <option value="landscape">Landscape</option>
+                            </select>
+                        </div>
+                        <div id="custom-page-size" class="form-row" style="display: none;">
+                            <label>Custom Size:</label>
+                            <input type="text" id="custom-width" placeholder="Width (e.g., 210mm)" style="width: 45%; display: inline-block;">
+                            <span style="display: inline-block; width: 5%; text-align: center;">×</span>
+                            <input type="text" id="custom-height" placeholder="Height (e.g., 297mm)" style="width: 45%; display: inline-block;">
+                        </div>
+                    </div>
+
                     <div class="export-section basic-options">
                         <label>Quick Export Settings:</label>
                         <div class="checkbox-group">
@@ -258,6 +330,250 @@
             </div>
         </div>
 
+        <!-- Print Preview Dialog -->
+        <div class="export-dialog hidden" id="print-preview-overlay">
+            <div class="export-dialog-content print-preview-dialog">
+                <div class="export-dialog-header">
+                    <h3>Print Preview</h3>
+                    <button id="print-preview-close" title="Close" style="background:none;border:none;color:white;font-size:24px;cursor:pointer;">&times;</button>
+                </div>
+                <div class="print-preview-body">
+                    <div class="print-preview-sidebar">
+                        <div class="print-option-group">
+                            <label>Paper Size</label>
+                            <select id="print-paper-size">
+                                <option value="A3">A3</option>
+                                <option value="A4" selected>A4</option>
+                                <option value="A5">A5</option>
+                                <option value="Letter">Letter</option>
+                                <option value="Legal">Legal</option>
+                                <option value="Tabloid">Tabloid</option>
+                            </select>
+                        </div>
+                        <div class="print-option-group">
+                            <label>Orientation</label>
+                            <select id="print-orientation">
+                                <option value="portrait" selected>Portrait</option>
+                                <option value="landscape">Landscape</option>
+                            </select>
+                        </div>
+                        <div class="print-option-group">
+                            <label>Margins</label>
+                            <select id="print-margins">
+                                <option value="default" selected>Default</option>
+                                <option value="narrow">Narrow</option>
+                                <option value="wide">Wide</option>
+                                <option value="none">None</option>
+                            </select>
+                        </div>
+                        <div class="print-option-group">
+                            <label>Scale</label>
+                            <div class="scale-control">
+                                <input type="range" id="print-scale" min="50" max="200" value="100">
+                                <span id="print-scale-value">100%</span>
+                            </div>
+                        </div>
+                        <div class="print-option-group">
+                            <label class="checkbox-label">
+                                <input type="checkbox" id="print-headers" checked>
+                                Headers &amp; Footers
+                            </label>
+                        </div>
+                        <div class="print-option-group">
+                            <label class="checkbox-label">
+                                <input type="checkbox" id="print-background" checked>
+                                Background Colors
+                            </label>
+                        </div>
+                        <div class="print-option-group">
+                            <label>Pages</label>
+                            <select id="print-pages">
+                                <option value="all" selected>All</option>
+                                <option value="custom">Custom Range</option>
+                            </select>
+                            <input type="text" id="print-page-range" placeholder="e.g., 1-3, 5" class="hidden print-range-input">
+                        </div>
+                        <div class="print-actions">
+                            <button class="btn-primary" id="print-execute">Print</button>
+                            <button class="btn-secondary" id="print-cancel">Cancel</button>
+                        </div>
+                    </div>
+                    <div class="print-preview-content">
+                        <iframe id="print-preview-frame" style="width:100%;height:100%;border:none;background:white;"></iframe>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <!-- Command Palette -->
+        <div class="command-palette-overlay hidden" id="command-palette-overlay">
+            <div class="command-palette">
+                <input type="text" class="command-palette-input" id="command-palette-input" placeholder="Type a command..." autocomplete="off">
+                <div class="command-palette-results" id="command-palette-results"></div>
+            </div>
+        </div>
+
+        <!-- Table Generator Dialog -->
+        <div id="table-generator-dialog" class="export-dialog hidden">
+            <div class="export-dialog-content" style="max-width: 500px;">
+                <div class="export-dialog-header">
+                    <h3>📊 Table Generator</h3>
+                    <button id="table-dialog-close" title="Close">×</button>
+                </div>
+                <div class="export-dialog-body">
+                    <div class="export-section">
+                        <label for="table-rows">Number of Rows:</label>
+                        <input type="number" id="table-rows" min="1" max="50" value="3" style="width: 100px;">
+                        <small>Total rows including header (if enabled)</small>
+                    </div>
+
+                    <div class="export-section">
+                        <label for="table-cols">Number of Columns:</label>
+                        <input type="number" id="table-cols" min="1" max="20" value="3" style="width: 100px;">
+                    </div>
+
+                    <div class="export-section">
+                        <label class="checkbox-label">
+                            <input type="checkbox" id="table-has-header" checked>
+                            Include Header Row
+                        </label>
+                        <small>First row will be formatted as table headers</small>
+                    </div>
+
+                    <div class="export-section">
+                        <label for="table-alignment">Column Alignment:</label>
+                        <select id="table-alignment">
+                            <option value="left">Left</option>
+                            <option value="center">Center</option>
+                            <option value="right">Right</option>
+                        </select>
+                        <small>Applies to all columns</small>
+                    </div>
+
+                    <div class="export-section">
+                        <label for="table-preview">Preview:</label>
+                        <pre id="table-preview" style="background: #f5f5f5; padding: 10px; border-radius: 4px; font-size: 12px; max-height: 300px; overflow: auto;"></pre>
+                    </div>
+                </div>
+                <div class="export-dialog-footer">
+                    <button id="table-generate-preview" class="btn-secondary">Update Preview</button>
+                    <button id="table-insert" class="btn-primary">Insert Table</button>
+                    <button id="table-cancel" class="btn-secondary">Cancel</button>
+                </div>
+            </div>
+        </div>
+
+        <!-- ASCII Art Generator Dialog -->
+        <div id="ascii-art-dialog" class="export-dialog hidden">
+            <div class="export-dialog-content" style="max-width: 700px;">
+                <div class="export-dialog-header">
+                    <h3>🎨 ASCII Art Generator</h3>
+                    <button id="ascii-dialog-close" title="Close">×</button>
+                </div>
+                <div class="export-dialog-body">
+                    <div class="export-section">
+                        <label>Mode:</label>
+                        <div style="display: flex; gap: 10px; margin-bottom: 10px;">
+                            <button id="ascii-mode-text" class="btn-secondary ascii-mode-btn active">Text Banner</button>
+                            <button id="ascii-mode-box" class="btn-secondary ascii-mode-btn">Box/Frame</button>
+                            <button id="ascii-mode-templates" class="btn-secondary ascii-mode-btn">Templates</button>
+                        </div>
+                    </div>
+
+                    <!-- Text Banner Mode -->
+                    <div id="ascii-text-mode" class="ascii-mode-section">
+                        <div class="export-section">
+                            <label for="ascii-text-input">Text to Convert:</label>
+                            <input type="text" id="ascii-text-input" placeholder="Enter your text..." maxlength="50">
+                        </div>
+                        <div class="export-section">
+                            <label for="ascii-font-style">Style:</label>
+                            <select id="ascii-font-style">
+                                <option value="standard">Standard</option>
+                                <option value="banner">Banner</option>
+                                <option value="block">Block</option>
+                                <option value="bubble">Bubble</option>
+                                <option value="digital">Digital</option>
+                            </select>
+                        </div>
+                    </div>
+
+                    <!-- Box/Frame Mode -->
+                    <div id="ascii-box-mode" class="ascii-mode-section hidden">
+                        <div class="export-section">
+                            <label for="ascii-box-text">Text Content:</label>
+                            <textarea id="ascii-box-text" rows="3" placeholder="Enter text for the box..."></textarea>
+                        </div>
+                        <div class="export-section">
+                            <label for="ascii-box-style">Box Style:</label>
+                            <select id="ascii-box-style">
+                                <option value="single">Single Line (─│┌┐└┘)</option>
+                                <option value="double">Double Line (═║╔╗╚╝)</option>
+                                <option value="rounded">Rounded (─│╭╮╰╯)</option>
+                                <option value="bold">Bold (━┃┏┓┗┛)</option>
+                                <option value="ascii">ASCII (+|-)</option>
+                            </select>
+                        </div>
+                        <div class="export-section">
+                            <label for="ascii-box-padding">Padding:</label>
+                            <input type="number" id="ascii-box-padding" min="1" max="10" value="2" style="width: 80px;">
+                        </div>
+                    </div>
+
+                    <!-- Templates Mode -->
+                    <div id="ascii-templates-mode" class="ascii-mode-section hidden">
+                        <div class="export-section">
+                            <label>Arrows & Flow:</label>
+                            <div style="display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 15px;">
+                                <button class="btn-secondary ascii-template-btn" data-template="arrow-right">Arrow →</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="arrow-down">Arrow ↓</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="decision">Decision</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="process-flow">Process Flow</button>
+                            </div>
+
+                            <label>Diagrams & Charts:</label>
+                            <div style="display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 15px;">
+                                <button class="btn-secondary ascii-template-btn" data-template="flowchart">Flowchart</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="sequence">Sequence</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="network">Network</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="hierarchy">Hierarchy</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="timeline">Timeline</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="table-simple">Table</button>
+                            </div>
+
+                            <label>Boxes & Containers:</label>
+                            <div style="display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 15px;">
+                                <button class="btn-secondary ascii-template-btn" data-template="header">Header</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="note-box">Note Box</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="warning-box">Warning</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="info-box">Info Box</button>
+                            </div>
+
+                            <label>Decorative Elements:</label>
+                            <div style="display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 15px;">
+                                <button class="btn-secondary ascii-template-btn" data-template="divider">Divider</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="separator-fancy">Separator</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="brackets">Brackets</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="banner-stars">Banner</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="check">Checklist ✓</button>
+                                <button class="btn-secondary ascii-template-btn" data-template="progress-bar">Progress Bar</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <div class="export-section">
+                        <label for="ascii-preview">Preview:</label>
+                        <pre id="ascii-preview" style="background: #f5f5f5; padding: 15px; border-radius: 4px; font-size: 12px; max-height: 400px; overflow: auto; font-family: 'Courier New', monospace; line-height: 1.2;"></pre>
+                    </div>
+                </div>
+                <div class="export-dialog-footer">
+                    <button id="ascii-generate" class="btn-secondary">Generate Preview</button>
+                    <button id="ascii-insert" class="btn-primary">Insert ASCII Art</button>
+                    <button id="ascii-cancel" class="btn-secondary">Cancel</button>
+                </div>
+            </div>
+        </div>
+
         <!-- Universal File Converter Dialog -->
         <div id="universal-converter-dialog" class="export-dialog hidden">
             <div class="export-dialog-content">
@@ -650,10 +966,13 @@
                             </div>
                         </div>
                         <div class="export-section">
-                            <label>Output File:</label>
+                            <label class="checkbox-inline"><input type="checkbox" id="compress-overwrite"> Overwrite original file</label>
+                        </div>
+                        <div class="export-section" id="compress-saveas-section">
+                            <label>Save As:</label>
                             <div class="folder-input-group">
-                                <input type="text" id="compress-output-path" placeholder="Choose output location..." readonly>
-                                <button id="browse-compress-output">Browse</button>
+                                <input type="text" id="compress-output-path" placeholder="Select save location..." readonly>
+                                <button id="browse-compress-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -681,10 +1000,13 @@
                             </select>
                         </div>
                         <div class="export-section">
-                            <label>Output File:</label>
+                            <label class="checkbox-inline"><input type="checkbox" id="rotate-overwrite"> Overwrite original file</label>
+                        </div>
+                        <div class="export-section" id="rotate-saveas-section">
+                            <label>Save As:</label>
                             <div class="folder-input-group">
-                                <input type="text" id="rotate-output-path" placeholder="Choose output location..." readonly>
-                                <button id="browse-rotate-output">Browse</button>
+                                <input type="text" id="rotate-output-path" placeholder="Select save location..." readonly>
+                                <button id="browse-rotate-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -704,10 +1026,13 @@
                             <small>Separate page numbers/ranges with commas</small>
                         </div>
                         <div class="export-section">
-                            <label>Output File:</label>
+                            <label class="checkbox-inline"><input type="checkbox" id="delete-overwrite"> Overwrite original file</label>
+                        </div>
+                        <div class="export-section" id="delete-saveas-section">
+                            <label>Save As:</label>
                             <div class="folder-input-group">
-                                <input type="text" id="delete-output-path" placeholder="Choose output location..." readonly>
-                                <button id="browse-delete-output">Browse</button>
+                                <input type="text" id="delete-output-path" placeholder="Select save location..." readonly>
+                                <button id="browse-delete-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -733,10 +1058,13 @@
                             </div>
                         </div>
                         <div class="export-section">
-                            <label>Output File:</label>
+                            <label class="checkbox-inline"><input type="checkbox" id="reorder-overwrite"> Overwrite original file</label>
+                        </div>
+                        <div class="export-section" id="reorder-saveas-section">
+                            <label>Save As:</label>
                             <div class="folder-input-group">
-                                <input type="text" id="reorder-output-path" placeholder="Choose output location..." readonly>
-                                <button id="browse-reorder-output">Browse</button>
+                                <input type="text" id="reorder-output-path" placeholder="Select save location..." readonly>
+                                <button id="browse-reorder-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -789,10 +1117,13 @@
                             <input type="text" id="watermark-custom-pages" placeholder="e.g., 1-5, 7, 9-12" class="hidden">
                         </div>
                         <div class="export-section">
-                            <label>Output File:</label>
+                            <label class="checkbox-inline"><input type="checkbox" id="watermark-overwrite"> Overwrite original file</label>
+                        </div>
+                        <div class="export-section" id="watermark-saveas-section">
+                            <label>Save As:</label>
                             <div class="folder-input-group">
-                                <input type="text" id="watermark-output-path" placeholder="Choose output location..." readonly>
-                                <button id="browse-watermark-output">Browse</button>
+                                <input type="text" id="watermark-output-path" placeholder="Select save location..." readonly>
+                                <button id="browse-watermark-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -838,10 +1169,13 @@
                             <small>These permissions apply when owner password is set</small>
                         </div>
                         <div class="export-section">
-                            <label>Output File:</label>
+                            <label class="checkbox-inline"><input type="checkbox" id="encrypt-overwrite"> Overwrite original file</label>
+                        </div>
+                        <div class="export-section" id="encrypt-saveas-section">
+                            <label>Save As:</label>
                             <div class="folder-input-group">
-                                <input type="text" id="encrypt-output-path" placeholder="Choose output location..." readonly>
-                                <button id="browse-encrypt-output">Browse</button>
+                                <input type="text" id="encrypt-output-path" placeholder="Select save location..." readonly>
+                                <button id="browse-encrypt-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -861,10 +1195,13 @@
                             <small>Enter the password to unlock and remove protection</small>
                         </div>
                         <div class="export-section">
-                            <label>Output File:</label>
+                            <label class="checkbox-inline"><input type="checkbox" id="decrypt-overwrite"> Overwrite original file</label>
+                        </div>
+                        <div class="export-section" id="decrypt-saveas-section">
+                            <label>Save As:</label>
                             <div class="folder-input-group">
-                                <input type="text" id="decrypt-output-path" placeholder="Choose output location..." readonly>
-                                <button id="browse-decrypt-output">Browse</button>
+                                <input type="text" id="decrypt-output-path" placeholder="Select save location..." readonly>
+                                <button id="browse-decrypt-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -901,10 +1238,13 @@
                             </div>
                         </div>
                         <div class="export-section">
-                            <label>Output File:</label>
+                            <label class="checkbox-inline"><input type="checkbox" id="permissions-overwrite"> Overwrite original file</label>
+                        </div>
+                        <div class="export-section" id="permissions-saveas-section">
+                            <label>Save As:</label>
                             <div class="folder-input-group">
-                                <input type="text" id="permissions-output-path" placeholder="Choose output location..." readonly>
-                                <button id="browse-permissions-output">Browse</button>
+                                <input type="text" id="permissions-output-path" placeholder="Select save location..." readonly>
+                                <button id="browse-permissions-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -964,7 +1304,7 @@
                             </div>
                             <div class="hf-logo-row">
                                 <label>Header Logo/Image:</label>
-                                <input type="file" id="header-logo" accept="image/*">
+                                <button id="header-logo-browse" class="browse-btn">Browse...</button>
                                 <button id="header-logo-clear" class="clear-btn">Clear</button>
                                 <span id="header-logo-preview" class="logo-preview"></span>
                             </div>
@@ -992,7 +1332,7 @@
                             </div>
                             <div class="hf-logo-row">
                                 <label>Footer Logo/Image:</label>
-                                <input type="file" id="footer-logo" accept="image/*">
+                                <button id="footer-logo-browse" class="browse-btn">Browse...</button>
                                 <button id="footer-logo-clear" class="clear-btn">Clear</button>
                                 <span id="footer-logo-preview" class="logo-preview"></span>
                             </div>
@@ -1041,23 +1381,186 @@
             </div>
         </div>
 
-        <div class="editor-container">
+        <div class="main-content" id="main-content">
+            <!-- Sidebar -->
+            <div class="sidebar collapsed" id="sidebar">
+                <div class="sidebar-icons">
+                    <button class="sidebar-icon" data-panel="explorer" title="File Explorer (Ctrl+Shift+E)">
+                        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <path d="M22 19a2 2 0 01-2 2H4a2 2 0 01-2-2V5a2 2 0 012-2h5l2 3h9a2 2 0 012 2z"/>
+                        </svg>
+                    </button>
+                    <button class="sidebar-icon" data-panel="git" title="Git (Ctrl+Shift+G)">
+                        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <line x1="6" y1="3" x2="6" y2="15"/>
+                            <circle cx="18" cy="6" r="3"/>
+                            <circle cx="6" cy="6" r="3"/>
+                            <path d="M18 9a9 9 0 01-9 9"/>
+                        </svg>
+                    </button>
+                    <button class="sidebar-icon" data-panel="snippets" title="Snippets (Ctrl+Shift+S)">
+                        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <polyline points="16 18 22 12 16 6"/>
+                            <polyline points="8 6 2 12 8 18"/>
+                        </svg>
+                    </button>
+                    <button class="sidebar-icon" data-panel="templates" title="Templates">
+                        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <rect x="3" y="3" width="18" height="18" rx="2" ry="2"/>
+                            <line x1="3" y1="9" x2="21" y2="9"/>
+                            <line x1="9" y1="21" x2="9" y2="9"/>
+                        </svg>
+                    </button>
+                </div>
+                <div class="sidebar-panel" id="sidebar-panel">
+                    <div class="sidebar-panel-header">
+                        <span class="sidebar-panel-title"></span>
+                        <button class="sidebar-panel-close" title="Close panel">&times;</button>
+                    </div>
+                    <div class="sidebar-panel-content" id="sidebar-panel-content"></div>
+                </div>
+            </div>
+
+            <!-- Editor Container -->
+            <div class="editor-container">
             <div class="tab-content active" id="tab-content-1" data-tab-id="1">
                 <div id="editor-pane-1" class="pane">
                     <div class="editor-wrapper">
-                        <div id="line-numbers-1" class="line-numbers hidden"></div>
-                        <textarea id="editor-1" class="editor-textarea"></textarea>
+                        <div id="editor-cm-1" class="codemirror-container"></div>
                     </div>
                 </div>
+                <div class="pane-resizer" id="pane-resizer-1" title="Drag to resize"></div>
                 <div id="preview-pane-1" class="pane">
                     <div id="preview-1" class="preview-content"></div>
                 </div>
             </div>
+
+            <!-- PDF Viewer Container (hidden by default) -->
+            <div id="pdf-viewer-container" class="pdf-viewer-container hidden">
+                <div class="pdf-viewer-toolbar pdf-toolbar-main">
+                    <!-- Navigation -->
+                    <button id="pdf-prev-page" title="Previous Page">◀</button>
+                    <span id="pdf-page-info">Page <input type="number" id="pdf-page-input" min="1" value="1"> of <span id="pdf-total-pages">0</span></span>
+                    <button id="pdf-next-page" title="Next Page">▶</button>
+                    <div class="pdf-toolbar-separator"></div>
+                    <!-- Zoom -->
+                    <button id="pdf-zoom-out" title="Zoom Out">−</button>
+                    <span id="pdf-zoom-level">100%</span>
+                    <button id="pdf-zoom-in" title="Zoom In">+</button>
+                    <button id="pdf-fit-width" title="Fit Width">↔</button>
+                    <button id="pdf-fit-page" title="Fit Page">⬜</button>
+                    <div class="pdf-toolbar-separator"></div>
+                    <!-- Rotation -->
+                    <button id="pdf-rotate-left" title="Rotate Left">↺</button>
+                    <button id="pdf-rotate-right" title="Rotate Right">↻</button>
+                    <div class="pdf-toolbar-separator"></div>
+                    <!-- PDF Editor Functions -->
+                    <button id="pdf-tb-merge" class="pdf-editor-btn" title="Merge PDFs">
+                        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <rect x="3" y="3" width="7" height="9" rx="1"></rect>
+                            <rect x="14" y="3" width="7" height="9" rx="1"></rect>
+                            <path d="M12 15v6m-3-3h6"></path>
+                        </svg>
+                        <span>Merge</span>
+                    </button>
+                    <button id="pdf-tb-split" class="pdf-editor-btn" title="Split PDF">
+                        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <rect x="3" y="3" width="18" height="9" rx="1"></rect>
+                            <path d="M12 12v9M9 18l3 3 3-3"></path>
+                        </svg>
+                        <span>Split</span>
+                    </button>
+                    <button id="pdf-tb-compress" class="pdf-editor-btn" title="Compress PDF">
+                        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <path d="M4 14h16M4 10h16M7 6l5 4 5-4M7 18l5-4 5 4"></path>
+                        </svg>
+                        <span>Compress</span>
+                    </button>
+                    <button id="pdf-tb-rotate" class="pdf-editor-btn" title="Rotate Pages">
+                        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <path d="M21 12a9 9 0 11-6.219-8.56"></path>
+                            <polyline points="21 3 21 9 15 9"></polyline>
+                        </svg>
+                        <span>Rotate</span>
+                    </button>
+                    <button id="pdf-tb-delete" class="pdf-editor-btn" title="Delete Pages">
+                        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <path d="M3 6h18M8 6V4a2 2 0 012-2h4a2 2 0 012 2v2m3 0v14a2 2 0 01-2 2H7a2 2 0 01-2-2V6h14z"></path>
+                        </svg>
+                        <span>Delete</span>
+                    </button>
+                    <button id="pdf-tb-reorder" class="pdf-editor-btn" title="Reorder Pages">
+                        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <line x1="3" y1="6" x2="21" y2="6"></line>
+                            <line x1="3" y1="12" x2="21" y2="12"></line>
+                            <line x1="3" y1="18" x2="21" y2="18"></line>
+                            <polyline points="7 9 4 12 7 15"></polyline>
+                            <polyline points="17 9 20 12 17 15"></polyline>
+                        </svg>
+                        <span>Reorder</span>
+                    </button>
+                    <button id="pdf-tb-watermark" class="pdf-editor-btn" title="Add Watermark">
+                        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <path d="M12 2L2 7l10 5 10-5-10-5z"></path>
+                            <path d="M2 17l10 5 10-5M2 12l10 5 10-5"></path>
+                        </svg>
+                        <span>Watermark</span>
+                    </button>
+                    <button id="pdf-tb-encrypt" class="pdf-editor-btn" title="Encrypt PDF">
+                        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <rect x="3" y="11" width="18" height="11" rx="2" ry="2"></rect>
+                            <path d="M7 11V7a5 5 0 0110 0v4"></path>
+                        </svg>
+                        <span>Encrypt</span>
+                    </button>
+                    <button id="pdf-tb-decrypt" class="pdf-editor-btn" title="Decrypt PDF">
+                        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                            <rect x="3" y="11" width="18" height="11" rx="2" ry="2"></rect>
+                            <path d="M7 11V7a5 5 0 019.9-1"></path>
+                        </svg>
+                        <span>Decrypt</span>
+                    </button>
+                    <div class="pdf-toolbar-separator"></div>
+                    <!-- File Info and Close -->
+                    <span id="pdf-filename" class="pdf-filename"></span>
+                    <button id="pdf-close" title="Close PDF">✕</button>
+                </div>
+                <div id="pdf-viewer" class="pdf-viewer">
+                    <canvas id="pdf-canvas"></canvas>
+                </div>
+            </div>
+            </div>
         </div>
 
-        <div class="status-bar">
-            <span id="status-text">Ready</span>
-            <span id="word-count">Words: 0 | Characters: 0</span>
+        <!-- Bottom Panel (REPL Output) -->
+        <div class="bottom-panel collapsed" id="bottom-panel">
+            <div class="bottom-panel-header">
+                <span class="bottom-panel-title">Output</span>
+                <div class="bottom-panel-actions">
+                    <button class="bottom-panel-btn" id="repl-clear" title="Clear output">Clear</button>
+                    <button class="bottom-panel-btn" id="bottom-panel-toggle" title="Toggle panel">&#x25BC;</button>
+                </div>
+            </div>
+            <div class="bottom-panel-content" id="repl-output"></div>
+        </div>
+
+        <div class="status-bar" id="status-bar">
+            <div class="status-bar-left">
+                <span class="status-item" id="status-text">Ready</span>
+                <span class="status-separator">|</span>
+                <span class="status-item" id="status-file-path" title=""></span>
+            </div>
+            <div class="status-bar-right">
+                <span class="status-item" id="word-count">Words: 0</span>
+                <span class="status-separator">|</span>
+                <span class="status-item" id="char-count">Chars: 0</span>
+                <span class="status-separator">|</span>
+                <span class="status-item" id="line-col">Ln 1, Col 1</span>
+                <span class="status-separator">|</span>
+                <span class="status-item" id="encoding">UTF-8</span>
+                <span class="status-separator">|</span>
+                <span class="status-item" id="language-mode">Markdown</span>
+            </div>
         </div>
     </div>
 

src/preload.js

@@ -0,0 +1,422 @@
+/**
+ * Preload Script for PanConverter
+ *
+ * This script creates a secure bridge between the main process and renderer process.
+ * It exposes only specific IPC channels, preventing direct Node.js access in the renderer.
+ *
+ * Security Benefits:
+ * - No direct access to Node.js APIs (fs, path, child_process, etc.)
+ * - All IPC channels are explicitly whitelisted
+ * - Prevents XSS from escalating to full system access
+ *
+ * @version 4.0.0
+ */
+
+const { contextBridge, ipcRenderer } = require('electron');
+
+// Define allowed IPC channels for security
+const ALLOWED_SEND_CHANNELS = [
+  // File operations
+  'save-file',
+  'save-current-file',
+  'set-current-file',
+  'save-recent-files',
+  'clear-recent-files',
+  'renderer-ready',
+
+  // Theme
+  'get-theme',
+
+  // Print
+  'do-print',
+  'do-print-with-options',
+
+  // Export
+  'export-with-options',
+  'export-spreadsheet',
+
+  // Batch conversion
+  'batch-convert',
+  'select-folder',
+
+  // Universal converter
+  'universal-convert',
+  'universal-convert-batch',
+
+  // Image converter
+  'image-convert',
+  'image-batch-convert',
+  'image-resize',
+  'image-compress',
+  'image-rotate',
+
+  // Audio converter
+  'audio-convert',
+  'audio-batch-convert',
+  'audio-extract',
+  'audio-trim',
+  'audio-merge',
+
+  // Video converter
+  'video-convert',
+  'video-batch-convert',
+  'video-compress',
+  'video-trim',
+  'video-frames',
+  'video-gif',
+
+  // Header/Footer
+  'get-header-footer-settings',
+  'save-header-footer-settings',
+  'browse-header-footer-logo',
+  'save-header-footer-logo',
+  'clear-header-footer-logo',
+
+  // Page settings
+  'get-page-settings',
+  'update-page-settings',
+
+  // Template settings
+  'set-custom-start-page',
+
+  // PDF operations
+  'process-pdf-operation',
+  'get-pdf-page-count',
+  'select-pdf-folder',
+
+  // ASCII generator (separate window)
+  'open-ascii-generator',
+
+  // Table generator (separate window)
+  'open-table-generator',
+
+  // Insert generated content
+  'insert-generated-content',
+
+  // Image paste/drop
+  'save-pasted-image',
+
+  // Templates
+  'load-template',
+
+  // File Explorer
+  'list-directory',
+
+  // Git
+  'git-status',
+  'git-stage',
+  'git-commit',
+  'git-log',
+
+  // Snippets
+  'get-snippets',
+  'save-snippet',
+  'delete-snippet',
+
+  // Code execution (REPL)
+  'execute-code',
+
+  // File open by path
+  'open-file-path',
+
+  // PDF editor from toolbar
+  'show-pdf-editor-from-toolbar',
+
+  // Menu triggers
+  'menu-open',
+  'export',
+
+  // Git diff
+  'git-diff'
+];
+
+const ALLOWED_RECEIVE_CHANNELS = [
+  // File operations
+  'file-new',
+  'file-opened',
+  'file-save',
+  'get-content-for-save',
+  'get-content-for-spreadsheet',
+  'recent-files-cleared',
+
+  // UI toggles
+  'toggle-preview',
+  'toggle-find',
+
+  // Theme
+  'theme-changed',
+  'theme-data',
+
+  // Edit operations
+  'undo',
+  'redo',
+
+  // Font
+  'adjust-font-size',
+
+  // Print
+  'print-preview',
+  'print-preview-styled',
+
+  // Export dialogs
+  'show-export-dialog',
+  'show-batch-dialog',
+  'show-universal-converter-dialog',
+  'show-table-generator',
+  'show-pdf-editor-dialog',
+
+  // Converter dialogs
+  'show-image-converter',
+  'show-audio-converter',
+  'show-video-converter',
+
+  // PDF viewer
+  'open-pdf-viewer',
+
+  // Conversion status
+  'conversion-status',
+  'conversion-complete',
+  'batch-progress',
+  'image-conversion-complete',
+  'audio-conversion-complete',
+  'video-conversion-complete',
+
+  // Folder selection
+  'folder-selected',
+  'pdf-folder-selected',
+
+  // Header/Footer
+  'header-footer-settings-data',
+  'header-footer-logo-selected',
+  'header-footer-logo-saved',
+
+  // Page settings
+  'page-settings-data',
+
+  // PDF operations
+  'pdf-page-count',
+  'pdf-operation-complete',
+  'pdf-operation-error',
+
+  // ASCII Art Generator
+  'show-ascii-generator-window',
+  'show-ascii-generator',
+
+  // Table Generator
+  'show-table-generator-window',
+
+  // Header/Footer dialog
+  'open-header-footer-dialog',
+  'header-footer-logo-cleared',
+
+  // PDF operation progress
+  'pdf-operation-progress',
+
+  // Insert content from generator windows
+  'insert-content',
+
+  // Batch converter
+  'show-batch-converter',
+
+  // v4 menu-triggered events
+  'load-template-menu',
+  'toggle-command-palette',
+  'toggle-sidebar-panel',
+  'toggle-bottom-panel'
+];
+
+/**
+ * Secure API exposed to renderer process
+ * Access via window.electronAPI in renderer
+ */
+contextBridge.exposeInMainWorld('electronAPI', {
+  // ============================================
+  // SEND METHODS (Renderer -> Main)
+  // ============================================
+
+  /**
+   * Send a message to the main process
+   * @param {string} channel - IPC channel name
+   * @param {any} data - Data to send
+   */
+  send: (channel, data) => {
+    if (ALLOWED_SEND_CHANNELS.includes(channel)) {
+      ipcRenderer.send(channel, data);
+    } else {
+      console.warn(`[Preload] Blocked send to unauthorized channel: ${channel}`);
+    }
+  },
+
+  /**
+   * Invoke a main process handler and get a response
+   * @param {string} channel - IPC channel name
+   * @param {any} data - Data to send
+   * @returns {Promise<any>} Response from main process
+   */
+  invoke: async (channel, data) => {
+    if (ALLOWED_SEND_CHANNELS.includes(channel)) {
+      return await ipcRenderer.invoke(channel, data);
+    } else {
+      console.warn(`[Preload] Blocked invoke to unauthorized channel: ${channel}`);
+      return null;
+    }
+  },
+
+  // ============================================
+  // RECEIVE METHODS (Main -> Renderer)
+  // ============================================
+
+  /**
+   * Register a listener for messages from main process
+   * @param {string} channel - IPC channel name
+   * @param {Function} callback - Function to call with received data
+   * @returns {Function} Cleanup function to remove listener
+   */
+  on: (channel, callback) => {
+    if (ALLOWED_RECEIVE_CHANNELS.includes(channel)) {
+      const subscription = (event, ...args) => callback(...args);
+      ipcRenderer.on(channel, subscription);
+
+      // Return cleanup function
+      return () => {
+        ipcRenderer.removeListener(channel, subscription);
+      };
+    } else {
+      console.warn(`[Preload] Blocked listener for unauthorized channel: ${channel}`);
+      return () => {}; // No-op cleanup
+    }
+  },
+
+  /**
+   * Register a one-time listener for messages from main process
+   * @param {string} channel - IPC channel name
+   * @param {Function} callback - Function to call with received data
+   */
+  once: (channel, callback) => {
+    if (ALLOWED_RECEIVE_CHANNELS.includes(channel)) {
+      ipcRenderer.once(channel, (event, ...args) => callback(...args));
+    } else {
+      console.warn(`[Preload] Blocked once listener for unauthorized channel: ${channel}`);
+    }
+  },
+
+  /**
+   * Remove all listeners for a channel
+   * @param {string} channel - IPC channel name
+   */
+  removeAllListeners: (channel) => {
+    if (ALLOWED_RECEIVE_CHANNELS.includes(channel)) {
+      ipcRenderer.removeAllListeners(channel);
+    }
+  },
+
+  // ============================================
+  // CONVENIENCE METHODS
+  // ============================================
+
+  // File Operations
+  file: {
+    save: (filePath, content) => ipcRenderer.send('save-file', { path: filePath, content }),
+    saveCurrent: (content) => ipcRenderer.send('save-current-file', content),
+    setCurrent: (filePath) => ipcRenderer.send('set-current-file', filePath),
+    saveRecent: (recentFiles) => ipcRenderer.send('save-recent-files', recentFiles),
+    clearRecent: () => ipcRenderer.send('clear-recent-files'),
+    rendererReady: () => ipcRenderer.send('renderer-ready')
+  },
+
+  // Theme Operations
+  theme: {
+    get: () => ipcRenderer.send('get-theme')
+  },
+
+  // Print Operations
+  print: {
+    doPrint: (options) => ipcRenderer.send('do-print', options)
+  },
+
+  // Export Operations
+  export: {
+    withOptions: (format, options) => ipcRenderer.send('export-with-options', { format, options }),
+    spreadsheet: (content, format) => ipcRenderer.send('export-spreadsheet', { content, format })
+  },
+
+  // Batch Conversion
+  batch: {
+    convert: (inputFolder, outputFolder, format, options) => {
+      ipcRenderer.send('batch-convert', { inputFolder, outputFolder, format, options });
+    },
+    selectFolder: (type) => ipcRenderer.send('select-folder', type)
+  },
+
+  // Universal Converter
+  converter: {
+    convert: (tool, fromFormat, toFormat, filePath) => {
+      ipcRenderer.send('universal-convert', { tool, fromFormat, toFormat, filePath });
+    },
+    convertBatch: (tool, fromFormat, toFormat, inputFolder, outputFolder) => {
+      ipcRenderer.send('universal-convert-batch', { tool, fromFormat, toFormat, inputFolder, outputFolder });
+    }
+  },
+
+  // Header/Footer Operations
+  headerFooter: {
+    getSettings: () => ipcRenderer.send('get-header-footer-settings'),
+    saveSettings: (settings) => ipcRenderer.send('save-header-footer-settings', settings),
+    browseLogo: (position) => ipcRenderer.send('browse-header-footer-logo', position),
+    saveLogo: (position, filePath) => ipcRenderer.send('save-header-footer-logo', { position, filePath }),
+    clearLogo: (position) => ipcRenderer.send('clear-header-footer-logo', position)
+  },
+
+  // Page Settings
+  page: {
+    getSettings: () => ipcRenderer.send('get-page-settings'),
+    updateSettings: (settings) => ipcRenderer.send('update-page-settings', settings),
+    setCustomStartPage: (pageNumber) => ipcRenderer.send('set-custom-start-page', pageNumber)
+  },
+
+  // PDF Operations
+  pdf: {
+    processOperation: (data) => ipcRenderer.send('process-pdf-operation', data),
+    getPageCount: (filePath) => ipcRenderer.send('get-pdf-page-count', filePath),
+    selectFolder: (inputId) => ipcRenderer.send('select-pdf-folder', inputId)
+  },
+
+  // Image Converter Operations
+  image: {
+    convert: (data) => ipcRenderer.send('image-convert', data),
+    batchConvert: (data) => ipcRenderer.send('image-batch-convert', data),
+    resize: (data) => ipcRenderer.send('image-resize', data),
+    compress: (data) => ipcRenderer.send('image-compress', data),
+    rotate: (data) => ipcRenderer.send('image-rotate', data)
+  },
+
+  // Audio Converter Operations
+  audio: {
+    convert: (data) => ipcRenderer.send('audio-convert', data),
+    batchConvert: (data) => ipcRenderer.send('audio-batch-convert', data),
+    extract: (data) => ipcRenderer.send('audio-extract', data),
+    trim: (data) => ipcRenderer.send('audio-trim', data),
+    merge: (data) => ipcRenderer.send('audio-merge', data)
+  },
+
+  // Video Converter Operations
+  video: {
+    convert: (data) => ipcRenderer.send('video-convert', data),
+    batchConvert: (data) => ipcRenderer.send('video-batch-convert', data),
+    compress: (data) => ipcRenderer.send('video-compress', data),
+    trim: (data) => ipcRenderer.send('video-trim', data),
+    extractFrames: (data) => ipcRenderer.send('video-frames', data),
+    toGif: (data) => ipcRenderer.send('video-gif', data)
+  },
+
+  // Generator Windows
+  generators: {
+    openAscii: () => ipcRenderer.send('open-ascii-generator'),
+    openTable: () => ipcRenderer.send('open-table-generator')
+  }
+});
+
+// Log successful preload initialization
+console.log('[Preload] Secure IPC bridge initialized');
+console.log('[Preload] Allowed send channels:', ALLOWED_SEND_CHANNELS.length);
+console.log('[Preload] Allowed receive channels:', ALLOWED_RECEIVE_CHANNELS.length);

src/print-preview.js

@@ -0,0 +1,139 @@
+class PrintPreview {
+    constructor() {
+        this.overlay = document.getElementById('print-preview-overlay');
+        this._lastContent = '';
+        this.setupEventListeners();
+    }
+
+    open(htmlContent) {
+        this._lastContent = htmlContent;
+        this.overlay.classList.remove('hidden');
+        this.updatePreview(htmlContent);
+        this.updateScaleLabel();
+    }
+
+    close() {
+        this.overlay.classList.add('hidden');
+    }
+
+    setupEventListeners() {
+        document.getElementById('print-preview-close')?.addEventListener('click', () => this.close());
+        document.getElementById('print-cancel')?.addEventListener('click', () => this.close());
+        document.getElementById('print-execute')?.addEventListener('click', () => this.executePrint());
+
+        // Update preview on option changes
+        ['print-paper-size', 'print-orientation', 'print-margins'].forEach(id => {
+            document.getElementById(id)?.addEventListener('change', () => this.refreshPreview());
+        });
+
+        // Scale slider
+        const scaleSlider = document.getElementById('print-scale');
+        scaleSlider?.addEventListener('input', () => this.updateScaleLabel());
+
+        // Page range toggle
+        document.getElementById('print-pages')?.addEventListener('change', (e) => {
+            const rangeInput = document.getElementById('print-page-range');
+            if (rangeInput) {
+                rangeInput.classList.toggle('hidden', e.target.value !== 'custom');
+            }
+        });
+
+        // Close on overlay click
+        this.overlay?.addEventListener('click', (e) => {
+            if (e.target === this.overlay) this.close();
+        });
+
+        // Close on Escape
+        document.addEventListener('keydown', (e) => {
+            if (e.key === 'Escape' && !this.overlay.classList.contains('hidden')) {
+                this.close();
+            }
+        });
+    }
+
+    updateScaleLabel() {
+        const scale = document.getElementById('print-scale')?.value || 100;
+        const label = document.getElementById('print-scale-value');
+        if (label) label.textContent = `${scale}%`;
+    }
+
+    updatePreview(htmlContent) {
+        const frame = document.getElementById('print-preview-frame');
+        if (!frame) return;
+
+        this._lastContent = htmlContent;
+
+        const orientation = document.getElementById('print-orientation')?.value || 'portrait';
+        const paperSize = document.getElementById('print-paper-size')?.value || 'A4';
+
+        // Get dimensions for paper size
+        const sizes = {
+            'A3': { width: '297mm', height: '420mm' },
+            'A4': { width: '210mm', height: '297mm' },
+            'A5': { width: '148mm', height: '210mm' },
+            'Letter': { width: '8.5in', height: '11in' },
+            'Legal': { width: '8.5in', height: '14in' },
+            'Tabloid': { width: '11in', height: '17in' },
+        };
+
+        const size = sizes[paperSize] || sizes['A4'];
+        const width = orientation === 'landscape' ? size.height : size.width;
+        const height = orientation === 'landscape' ? size.width : size.height;
+
+        const previewHtml = `
+            <!DOCTYPE html>
+            <html>
+            <head>
+                <style>
+                    body {
+                        margin: 20px;
+                        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
+                        font-size: 14px;
+                        line-height: 1.6;
+                    }
+                    @page { size: ${width} ${height}; }
+                    pre { background: #f5f5f5; padding: 12px; border-radius: 6px; overflow-x: auto; }
+                    code { background: #f0f0f0; padding: 2px 6px; border-radius: 3px; font-size: 13px; }
+                    pre code { background: none; padding: 0; }
+                    table { border-collapse: collapse; width: 100%; }
+                    th, td { border: 1px solid #ddd; padding: 8px; }
+                    blockquote { border-left: 4px solid #ddd; margin-left: 0; padding-left: 16px; color: #666; }
+                    img { max-width: 100%; }
+                    h1, h2, h3 { margin-top: 1.5em; }
+                </style>
+            </head>
+            <body>${htmlContent || ''}</body>
+            </html>
+        `;
+
+        frame.srcdoc = previewHtml;
+    }
+
+    refreshPreview() {
+        if (this._lastContent) {
+            this.updatePreview(this._lastContent);
+        }
+    }
+
+    getOptions() {
+        return {
+            paperSize: document.getElementById('print-paper-size')?.value || 'A4',
+            orientation: document.getElementById('print-orientation')?.value || 'portrait',
+            margins: document.getElementById('print-margins')?.value || 'default',
+            scale: parseInt(document.getElementById('print-scale')?.value || '100'),
+            headers: document.getElementById('print-headers')?.checked ?? true,
+            background: document.getElementById('print-background')?.checked ?? true,
+            pages: document.getElementById('print-pages')?.value || 'all',
+            pageRange: document.getElementById('print-page-range')?.value || '',
+        };
+    }
+
+    executePrint() {
+        const options = this.getOptions();
+        const { ipcRenderer } = require('electron');
+        ipcRenderer.send('do-print-with-options', options);
+        this.close();
+    }
+}
+
+module.exports = { PrintPreview };

src/repl/repl-panel.js

@@ -0,0 +1,49 @@
+class ReplPanel {
+    constructor() {
+        this.panel = document.getElementById('bottom-panel');
+        this.output = document.getElementById('repl-output');
+        this.setupEventListeners();
+    }
+
+    setupEventListeners() {
+        document.getElementById('bottom-panel-toggle')?.addEventListener('click', () => this.toggle());
+        document.getElementById('repl-clear')?.addEventListener('click', () => this.clear());
+    }
+
+    toggle() {
+        this.panel.classList.toggle('collapsed');
+        const btn = document.getElementById('bottom-panel-toggle');
+        if (btn) btn.textContent = this.panel.classList.contains('collapsed') ? '\u25BC' : '\u25B2';
+    }
+
+    show() {
+        this.panel.classList.remove('collapsed');
+        const btn = document.getElementById('bottom-panel-toggle');
+        if (btn) btn.textContent = '\u25B2';
+    }
+
+    clear() {
+        if (this.output) this.output.innerHTML = '';
+    }
+
+    appendOutput(command, result) {
+        const entry = document.createElement('div');
+        entry.className = 'repl-entry';
+        entry.innerHTML = `
+            <div class="repl-command">\u25B6 ${command}</div>
+            ${result.stdout ? `<div class="repl-stdout">${this.escapeHtml(result.stdout)}</div>` : ''}
+            ${result.stderr ? `<div class="repl-stderr">${this.escapeHtml(result.stderr)}</div>` : ''}
+            ${result.error ? `<div class="repl-error">Error: ${this.escapeHtml(result.error)}</div>` : ''}
+        `;
+        this.output?.appendChild(entry);
+        this.output?.scrollTo(0, this.output.scrollHeight);
+    }
+
+    escapeHtml(text) {
+        const div = document.createElement('div');
+        div.textContent = text;
+        return div.innerHTML;
+    }
+}
+
+module.exports = { ReplPanel };

src/sidebar/explorer-panel.js

@@ -0,0 +1,70 @@
+const path = require('path');
+
+function renderExplorerPanel(container, { listDirectory, onFileOpen, currentDir }) {
+    container.innerHTML = `
+        <div class="explorer-panel">
+            <div class="explorer-toolbar">
+                <input type="text" class="explorer-path" id="explorer-path" value="${currentDir || ''}" placeholder="Open a folder..." readonly>
+                <button class="explorer-browse-btn" id="explorer-browse" title="Browse folder">&#x1F4C2;</button>
+            </div>
+            <div class="explorer-tree" id="explorer-tree"></div>
+        </div>
+    `;
+
+    document.getElementById('explorer-browse')?.addEventListener('click', async () => {
+        const dir = await listDirectory(null); // null means open folder dialog
+        if (dir) {
+            document.getElementById('explorer-path').value = dir.path;
+            renderTree(document.getElementById('explorer-tree'), dir.entries, listDirectory, onFileOpen, dir.path);
+        }
+    });
+
+    if (currentDir) {
+        listDirectory(currentDir).then(dir => {
+            if (dir) renderTree(document.getElementById('explorer-tree'), dir.entries, listDirectory, onFileOpen, currentDir);
+        });
+    }
+}
+
+function renderTree(container, entries, listDirectory, onFileOpen, basePath) {
+    container.innerHTML = entries.map(entry => {
+        if (entry.isDirectory) {
+            return `<div class="tree-item tree-folder collapsed" data-path="${entry.path}">
+                <span class="tree-icon">&#x25B6;</span>
+                <span class="tree-name">${entry.name}</span>
+                <div class="tree-children"></div>
+            </div>`;
+        }
+        return `<div class="tree-item tree-file" data-path="${entry.path}">
+            <span class="tree-icon">${getFileIcon(entry.name)}</span>
+            <span class="tree-name">${entry.name}</span>
+        </div>`;
+    }).join('');
+
+    container.querySelectorAll('.tree-folder').forEach(el => {
+        el.querySelector('.tree-name').addEventListener('click', async () => {
+            const isCollapsed = el.classList.contains('collapsed');
+            if (isCollapsed) {
+                const dir = await listDirectory(el.dataset.path);
+                if (dir) {
+                    const childContainer = el.querySelector('.tree-children');
+                    renderTree(childContainer, dir.entries, listDirectory, onFileOpen, el.dataset.path);
+                }
+            }
+            el.classList.toggle('collapsed');
+            el.querySelector('.tree-icon').textContent = el.classList.contains('collapsed') ? '\u25B6' : '\u25BC';
+        });
+    });
+
+    container.querySelectorAll('.tree-file').forEach(el => {
+        el.addEventListener('click', () => onFileOpen(el.dataset.path));
+    });
+}
+
+function getFileIcon(filename) {
+    const ext = filename.split('.').pop().toLowerCase();
+    const icons = { md: '\u{1F4DD}', js: '\u{1F4DC}', json: '{}', html: '\u{1F310}', css: '\u{1F3A8}', py: '\u{1F40D}', pdf: '\u{1F4D5}', txt: '\u{1F4C4}' };
+    return icons[ext] || '\u{1F4C4}';
+}
+
+module.exports = { renderExplorerPanel };

src/sidebar/git-panel.js

@@ -0,0 +1,84 @@
+function renderGitPanel(container, { gitStatus, gitDiff, gitStage, gitCommit, gitLog }) {
+    container.innerHTML = `
+        <div class="git-panel">
+            <div class="git-section">
+                <h4 class="git-section-title">Changes</h4>
+                <div class="git-changes" id="git-changes">
+                    <p class="git-loading">Loading...</p>
+                </div>
+            </div>
+            <div class="git-section">
+                <h4 class="git-section-title">Commit</h4>
+                <textarea class="git-commit-input" id="git-commit-msg" placeholder="Commit message..." rows="3"></textarea>
+                <button class="git-commit-btn" id="git-commit-btn">Commit</button>
+            </div>
+            <div class="git-section">
+                <h4 class="git-section-title">Recent Commits</h4>
+                <div class="git-log" id="git-log"></div>
+            </div>
+        </div>
+    `;
+
+    loadGitStatus();
+
+    async function loadGitStatus() {
+        const status = await gitStatus();
+        const changesEl = document.getElementById('git-changes');
+        if (!status || !changesEl) return;
+
+        if (status.error) {
+            changesEl.innerHTML = `<p class="git-info">${status.error}</p>`;
+            return;
+        }
+
+        const files = [
+            ...status.modified.map(f => ({ file: f, status: 'M', color: '#f59e0b' })),
+            ...status.not_added.map(f => ({ file: f, status: '?', color: '#6b7280' })),
+            ...status.created.map(f => ({ file: f, status: 'A', color: '#10b981' })),
+            ...status.deleted.map(f => ({ file: f, status: 'D', color: '#ef4444' })),
+            ...status.staged.map(f => ({ file: f, status: 'S', color: '#3b82f6' })),
+        ];
+
+        if (files.length === 0) {
+            changesEl.innerHTML = '<p class="git-info">No changes</p>';
+        } else {
+            changesEl.innerHTML = files.map(f => `
+                <div class="git-file" data-file="${f.file}">
+                    <span class="git-file-status" style="color:${f.color}">${f.status}</span>
+                    <span class="git-file-name">${f.file}</span>
+                    <button class="git-stage-btn" data-file="${f.file}" title="Stage file">+</button>
+                </div>
+            `).join('');
+
+            changesEl.querySelectorAll('.git-stage-btn').forEach(btn => {
+                btn.addEventListener('click', async (e) => {
+                    e.stopPropagation();
+                    await gitStage([btn.dataset.file]);
+                    loadGitStatus();
+                });
+            });
+        }
+
+        // Load log
+        const log = await gitLog();
+        const logEl = document.getElementById('git-log');
+        if (log && logEl) {
+            logEl.innerHTML = (log.all || []).slice(0, 10).map(entry => `
+                <div class="git-log-entry">
+                    <div class="git-log-msg">${entry.message}</div>
+                    <div class="git-log-meta">${entry.date?.substring(0, 10) || ''} &middot; ${entry.author_name || ''}</div>
+                </div>
+            `).join('') || '<p class="git-info">No commits</p>';
+        }
+    }
+
+    document.getElementById('git-commit-btn')?.addEventListener('click', async () => {
+        const msg = document.getElementById('git-commit-msg')?.value?.trim();
+        if (!msg) return;
+        await gitCommit(msg);
+        document.getElementById('git-commit-msg').value = '';
+        loadGitStatus();
+    });
+}
+
+module.exports = { renderGitPanel };

src/sidebar/sidebar-manager.js

@@ -0,0 +1,50 @@
+class SidebarManager {
+    constructor() {
+        this.sidebar = document.getElementById('sidebar');
+        this.panelContent = document.getElementById('sidebar-panel-content');
+        this.panelTitle = document.querySelector('.sidebar-panel-title');
+        this.activePanel = null;
+        this.panels = new Map();
+        this.setupEventListeners();
+    }
+
+    setupEventListeners() {
+        document.querySelectorAll('.sidebar-icon').forEach(btn => {
+            btn.addEventListener('click', () => this.togglePanel(btn.dataset.panel));
+        });
+        document.querySelector('.sidebar-panel-close')?.addEventListener('click', () => this.collapse());
+    }
+
+    registerPanel(name, { title, render }) {
+        this.panels.set(name, { title, render });
+    }
+
+    togglePanel(name) {
+        if (this.activePanel === name) {
+            this.collapse();
+        } else {
+            this.expand(name);
+        }
+    }
+
+    expand(name) {
+        const panel = this.panels.get(name);
+        if (!panel) return;
+        this.sidebar.classList.remove('collapsed');
+        this.panelTitle.textContent = panel.title;
+        this.panelContent.innerHTML = '';
+        panel.render(this.panelContent);
+        this.activePanel = name;
+        document.querySelectorAll('.sidebar-icon').forEach(btn => {
+            btn.classList.toggle('active', btn.dataset.panel === name);
+        });
+    }
+
+    collapse() {
+        this.sidebar.classList.add('collapsed');
+        this.activePanel = null;
+        document.querySelectorAll('.sidebar-icon').forEach(btn => btn.classList.remove('active'));
+    }
+}
+
+module.exports = { SidebarManager };

src/sidebar/snippets-panel.js

@@ -0,0 +1,71 @@
+function renderSnippetsPanel(container, { getSnippets, saveSnippet, deleteSnippet, onInsert }) {
+    container.innerHTML = `
+        <div class="snippets-panel">
+            <div class="snippets-toolbar">
+                <input type="text" class="snippets-search" id="snippets-search" placeholder="Search snippets...">
+                <button class="snippets-add-btn" id="snippets-add" title="Add snippet">+</button>
+            </div>
+            <div class="snippets-list" id="snippets-list"></div>
+        </div>
+    `;
+
+    let snippets = [];
+
+    async function loadSnippets() {
+        snippets = await getSnippets() || [];
+        renderList(document.getElementById('snippets-search')?.value || '');
+    }
+
+    function renderList(query) {
+        const list = document.getElementById('snippets-list');
+        if (!list) return;
+
+        const filtered = query
+            ? snippets.filter(s => s.name.toLowerCase().includes(query.toLowerCase()) || (s.language || '').toLowerCase().includes(query.toLowerCase()))
+            : snippets;
+
+        list.innerHTML = filtered.length ? filtered.map(s => `
+            <div class="snippet-item" data-id="${s.id}">
+                <div class="snippet-header">
+                    <span class="snippet-name">${s.name}</span>
+                    <span class="snippet-lang">${s.language || 'text'}</span>
+                </div>
+                <pre class="snippet-preview"><code>${(s.code || '').substring(0, 100)}${(s.code || '').length > 100 ? '...' : ''}</code></pre>
+                <div class="snippet-actions">
+                    <button class="snippet-insert" data-id="${s.id}" title="Insert">Insert</button>
+                    <button class="snippet-delete" data-id="${s.id}" title="Delete">&times;</button>
+                </div>
+            </div>
+        `).join('') : '<p class="git-info">No snippets yet. Click + to add one.</p>';
+
+        list.querySelectorAll('.snippet-insert').forEach(btn => {
+            btn.addEventListener('click', () => {
+                const s = snippets.find(sn => sn.id === btn.dataset.id);
+                if (s) onInsert(s.code);
+            });
+        });
+
+        list.querySelectorAll('.snippet-delete').forEach(btn => {
+            btn.addEventListener('click', async () => {
+                await deleteSnippet(btn.dataset.id);
+                loadSnippets();
+            });
+        });
+    }
+
+    document.getElementById('snippets-search')?.addEventListener('input', (e) => renderList(e.target.value));
+
+    document.getElementById('snippets-add')?.addEventListener('click', () => {
+        const name = prompt('Snippet name:');
+        if (!name) return;
+        const language = prompt('Language (e.g., javascript, python, html):') || 'text';
+        const code = prompt('Paste your code snippet:');
+        if (!code) return;
+
+        saveSnippet({ id: Date.now().toString(), name, language, code }).then(() => loadSnippets());
+    });
+
+    loadSnippets();
+}
+
+module.exports = { renderSnippetsPanel };

src/sidebar/templates-panel.js

@@ -0,0 +1,34 @@
+const fs = require('fs');
+const path = require('path');
+
+const templates = [
+    { name: 'Blog Post', file: 'blog-post.md', description: 'Article with frontmatter' },
+    { name: 'Meeting Notes', file: 'meeting-notes.md', description: 'Agenda, notes, action items' },
+    { name: 'Technical Spec', file: 'technical-spec.md', description: 'Requirements and architecture' },
+    { name: 'Changelog', file: 'changelog.md', description: 'Keep a Changelog format' },
+    { name: 'README', file: 'readme.md', description: 'Project documentation' },
+    { name: 'Project Plan', file: 'project-plan.md', description: 'Goals, milestones, timeline' },
+    { name: 'API Docs', file: 'api-docs.md', description: 'API endpoint documentation' },
+    { name: 'Tutorial', file: 'tutorial.md', description: 'Step-by-step guide' },
+    { name: 'Release Notes', file: 'release-notes.md', description: 'Version release summary' },
+    { name: 'Comparison', file: 'comparison.md', description: 'Feature comparison table' },
+];
+
+function renderTemplatesPanel(container, onSelect) {
+    container.innerHTML = `
+        <div class="panel-list">
+            ${templates.map(t => `
+                <div class="panel-list-item template-item" data-file="${t.file}">
+                    <div class="panel-list-item-title">${t.name}</div>
+                    <div class="panel-list-item-desc">${t.description}</div>
+                </div>
+            `).join('')}
+        </div>
+    `;
+
+    container.querySelectorAll('.template-item').forEach(el => {
+        el.addEventListener('click', () => onSelect(el.dataset.file));
+    });
+}
+
+module.exports = { renderTemplatesPanel, templates };

src/styles-concreteinfo.css

@@ -0,0 +1,969 @@
+/**
+ * ConcreteInfo Theme for MarkdownConverter
+ * Based on logo palette: #464646, #9a9696, #e5461f, #e3e3e3, #0d0b09
+ * Version: 3.0.0
+ */
+
+/* ============================================
+   CSS Variables - ConcreteInfo Theme
+   ============================================ */
+:root {
+  /* Primary Colors from Logo Palette */
+  --ci-dark-gray: #464646;
+  --ci-medium-gray: #9a9696;
+  --ci-accent: #e5461f;
+  --ci-light-gray: #e3e3e3;
+  --ci-black: #0d0b09;
+
+  /* Extended Palette */
+  --ci-accent-hover: #c93a18;
+  --ci-accent-light: rgba(229, 70, 31, 0.1);
+  --ci-white: #ffffff;
+  --ci-bg: #f5f5f5;
+  --ci-border: #d0d0d0;
+
+  /* Semantic Colors */
+  --ci-success: #28a745;
+  --ci-warning: #ffc107;
+  --ci-danger: #dc3545;
+  --ci-info: #17a2b8;
+
+  /* Typography */
+  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
+  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
+
+  /* Spacing */
+  --spacing-xs: 4px;
+  --spacing-sm: 8px;
+  --spacing-md: 16px;
+  --spacing-lg: 24px;
+  --spacing-xl: 32px;
+
+  /* Border Radius */
+  --radius-sm: 4px;
+  --radius-md: 8px;
+  --radius-lg: 12px;
+  --radius-full: 9999px;
+
+  /* Shadows */
+  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
+  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
+  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
+  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
+
+  /* Transitions */
+  --transition-fast: 150ms ease;
+  --transition-normal: 250ms ease;
+  --transition-slow: 350ms ease;
+}
+
+/* ============================================
+   ConcreteInfo Theme Application
+   ============================================ */
+body.theme-concreteinfo {
+  background: var(--ci-bg);
+  color: var(--ci-dark-gray);
+}
+
+body.theme-concreteinfo .toolbar {
+  background: linear-gradient(135deg, var(--ci-dark-gray) 0%, var(--ci-black) 100%);
+  border-bottom: 3px solid var(--ci-accent);
+}
+
+body.theme-concreteinfo .toolbar button {
+  color: var(--ci-white);
+  background: transparent;
+  border: 1px solid transparent;
+  transition: all var(--transition-fast);
+}
+
+body.theme-concreteinfo .toolbar button:hover {
+  background: var(--ci-accent);
+  border-color: var(--ci-accent);
+  transform: translateY(-1px);
+}
+
+body.theme-concreteinfo .tab-bar {
+  background: var(--ci-dark-gray);
+  border-bottom: 2px solid var(--ci-accent);
+}
+
+body.theme-concreteinfo .tab {
+  background: var(--ci-medium-gray);
+  color: var(--ci-white);
+  border: none;
+  margin: 2px;
+  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
+  transition: all var(--transition-fast);
+}
+
+body.theme-concreteinfo .tab:hover {
+  background: var(--ci-accent-light);
+}
+
+body.theme-concreteinfo .tab.active {
+  background: var(--ci-accent);
+  color: var(--ci-white);
+}
+
+body.theme-concreteinfo .editor-textarea {
+  background: var(--ci-white);
+  color: var(--ci-black);
+  border: 1px solid var(--ci-border);
+  font-family: var(--font-mono);
+}
+
+body.theme-concreteinfo .preview-content {
+  background: var(--ci-white);
+  color: var(--ci-dark-gray);
+  border-left: 3px solid var(--ci-accent);
+}
+
+body.theme-concreteinfo .status-bar {
+  background: var(--ci-dark-gray);
+  color: var(--ci-light-gray);
+  border-top: 2px solid var(--ci-accent);
+}
+
+/* ============================================
+   Modern Modal Styles
+   ============================================ */
+.modal-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: rgba(13, 11, 9, 0.7);
+  backdrop-filter: blur(4px);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 10000;
+  opacity: 0;
+  visibility: hidden;
+  transition: all var(--transition-normal);
+}
+
+.modal-overlay.active {
+  opacity: 1;
+  visibility: visible;
+}
+
+.modal-content {
+  background: var(--ci-white);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-xl);
+  max-width: 600px;
+  width: 90%;
+  max-height: 85vh;
+  overflow: hidden;
+  transform: scale(0.9) translateY(20px);
+  transition: transform var(--transition-normal);
+}
+
+.modal-overlay.active .modal-content {
+  transform: scale(1) translateY(0);
+}
+
+.modal-header {
+  background: linear-gradient(135deg, var(--ci-dark-gray) 0%, var(--ci-black) 100%);
+  color: var(--ci-white);
+  padding: var(--spacing-md) var(--spacing-lg);
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  border-bottom: 3px solid var(--ci-accent);
+}
+
+.modal-header h3 {
+  margin: 0;
+  font-size: 1.25rem;
+  font-weight: 600;
+  font-family: var(--font-sans);
+}
+
+.modal-close {
+  background: transparent;
+  border: none;
+  color: var(--ci-white);
+  font-size: 1.5rem;
+  cursor: pointer;
+  width: 32px;
+  height: 32px;
+  border-radius: var(--radius-full);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: all var(--transition-fast);
+}
+
+.modal-close:hover {
+  background: var(--ci-accent);
+  transform: rotate(90deg);
+}
+
+.modal-body {
+  padding: var(--spacing-lg);
+  overflow-y: auto;
+  max-height: 60vh;
+}
+
+.modal-footer {
+  padding: var(--spacing-md) var(--spacing-lg);
+  background: var(--ci-light-gray);
+  display: flex;
+  justify-content: flex-end;
+  gap: var(--spacing-sm);
+  border-top: 1px solid var(--ci-border);
+}
+
+/* ============================================
+   Button Styles
+   ============================================ */
+.btn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: var(--spacing-xs);
+  padding: var(--spacing-sm) var(--spacing-md);
+  font-family: var(--font-sans);
+  font-size: 0.875rem;
+  font-weight: 500;
+  border-radius: var(--radius-md);
+  border: none;
+  cursor: pointer;
+  transition: all var(--transition-fast);
+}
+
+.btn-primary {
+  background: var(--ci-accent);
+  color: var(--ci-white);
+}
+
+.btn-primary:hover {
+  background: var(--ci-accent-hover);
+  transform: translateY(-1px);
+  box-shadow: var(--shadow-md);
+}
+
+.btn-secondary {
+  background: var(--ci-medium-gray);
+  color: var(--ci-white);
+}
+
+.btn-secondary:hover {
+  background: var(--ci-dark-gray);
+}
+
+.btn-outline {
+  background: transparent;
+  border: 2px solid var(--ci-accent);
+  color: var(--ci-accent);
+}
+
+.btn-outline:hover {
+  background: var(--ci-accent);
+  color: var(--ci-white);
+}
+
+.btn-ghost {
+  background: transparent;
+  color: var(--ci-dark-gray);
+}
+
+.btn-ghost:hover {
+  background: var(--ci-light-gray);
+}
+
+/* ============================================
+   Form Controls
+   ============================================ */
+.form-group {
+  margin-bottom: var(--spacing-md);
+}
+
+.form-label {
+  display: block;
+  margin-bottom: var(--spacing-xs);
+  font-weight: 500;
+  color: var(--ci-dark-gray);
+  font-size: 0.875rem;
+}
+
+.form-input,
+.form-select {
+  width: 100%;
+  padding: var(--spacing-sm) var(--spacing-md);
+  font-family: var(--font-sans);
+  font-size: 0.875rem;
+  border: 2px solid var(--ci-border);
+  border-radius: var(--radius-md);
+  background: var(--ci-white);
+  color: var(--ci-dark-gray);
+  transition: all var(--transition-fast);
+}
+
+.form-input:focus,
+.form-select:focus {
+  outline: none;
+  border-color: var(--ci-accent);
+  box-shadow: 0 0 0 3px var(--ci-accent-light);
+}
+
+.form-input::placeholder {
+  color: var(--ci-medium-gray);
+}
+
+/* ============================================
+   App Header with Logo
+   ============================================ */
+.app-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 6px 16px;
+  background: #ffffff;
+  border-bottom: 2px solid #e1e4e8;
+  min-height: 36px;
+}
+
+.app-header-left {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.app-header-right {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.app-logo {
+  height: 22px;
+  width: auto;
+}
+
+.app-title {
+  color: #24292e;
+  font-size: 0.95rem;
+  font-weight: 600;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
+}
+
+.app-version {
+  color: #6a737d;
+  font-size: 0.7rem;
+  font-family: 'SFMono-Regular', Consolas, monospace;
+}
+
+/* Dark theme header adjustments */
+body.theme-dark .app-header,
+body.theme-dracula .app-header,
+body.theme-onedark .app-header,
+body.theme-tokyonight .app-header,
+body.theme-monokai .app-header,
+body.theme-cobalt2 .app-header,
+body.theme-gruvbox-dark .app-header,
+body.theme-ayu-dark .app-header,
+body.theme-ayu-mirage .app-header,
+body.theme-palenight .app-header,
+body.theme-oceanic-next .app-header,
+body.theme-nord .app-header,
+body.theme-concrete-dark .app-header {
+  background: #1f2937;
+  border-bottom-color: #374151;
+}
+
+body.theme-dark .app-title,
+body.theme-dracula .app-title,
+body.theme-onedark .app-title,
+body.theme-tokyonight .app-title,
+body.theme-monokai .app-title,
+body.theme-cobalt2 .app-title,
+body.theme-gruvbox-dark .app-title,
+body.theme-ayu-dark .app-title,
+body.theme-ayu-mirage .app-title,
+body.theme-palenight .app-title,
+body.theme-oceanic-next .app-title,
+body.theme-nord .app-title,
+body.theme-concrete-dark .app-title {
+  color: #f3f4f6;
+}
+
+body.theme-dark .app-version,
+body.theme-dracula .app-version,
+body.theme-onedark .app-version,
+body.theme-tokyonight .app-version,
+body.theme-monokai .app-version,
+body.theme-cobalt2 .app-version,
+body.theme-gruvbox-dark .app-version,
+body.theme-ayu-dark .app-version,
+body.theme-ayu-mirage .app-version,
+body.theme-palenight .app-version,
+body.theme-oceanic-next .app-version,
+body.theme-nord .app-version,
+body.theme-concrete-dark .app-version {
+  color: #9ca3af;
+}
+
+body.theme-dark .app-logo,
+body.theme-dracula .app-logo,
+body.theme-onedark .app-logo,
+body.theme-tokyonight .app-logo,
+body.theme-monokai .app-logo,
+body.theme-cobalt2 .app-logo,
+body.theme-gruvbox-dark .app-logo,
+body.theme-ayu-dark .app-logo,
+body.theme-ayu-mirage .app-logo,
+body.theme-palenight .app-logo,
+body.theme-oceanic-next .app-logo,
+body.theme-nord .app-logo,
+body.theme-concrete-dark .app-logo {
+  filter: none;
+}
+
+/* ============================================
+   Converter Cards
+   ============================================ */
+.converter-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+  gap: var(--spacing-md);
+  padding: var(--spacing-md);
+}
+
+.converter-card {
+  background: var(--ci-white);
+  border-radius: var(--radius-lg);
+  padding: var(--spacing-lg);
+  text-align: center;
+  border: 2px solid var(--ci-border);
+  transition: all var(--transition-fast);
+  cursor: pointer;
+}
+
+.converter-card:hover {
+  border-color: var(--ci-accent);
+  transform: translateY(-4px);
+  box-shadow: var(--shadow-lg);
+}
+
+.converter-card-icon {
+  font-size: 2.5rem;
+  margin-bottom: var(--spacing-md);
+}
+
+.converter-card-title {
+  font-weight: 600;
+  color: var(--ci-dark-gray);
+  margin-bottom: var(--spacing-xs);
+}
+
+.converter-card-desc {
+  font-size: 0.875rem;
+  color: var(--ci-medium-gray);
+}
+
+/* ============================================
+   Progress Bar
+   ============================================ */
+.progress-bar {
+  height: 8px;
+  background: var(--ci-light-gray);
+  border-radius: var(--radius-full);
+  overflow: hidden;
+}
+
+.progress-fill {
+  height: 100%;
+  background: linear-gradient(90deg, var(--ci-accent) 0%, var(--ci-accent-hover) 100%);
+  border-radius: var(--radius-full);
+  transition: width var(--transition-normal);
+}
+
+/* ============================================
+   File Drop Zone
+   ============================================ */
+.drop-zone {
+  border: 2px dashed var(--ci-border);
+  border-radius: var(--radius-lg);
+  padding: var(--spacing-xl);
+  text-align: center;
+  transition: all var(--transition-fast);
+  cursor: pointer;
+}
+
+.drop-zone:hover,
+.drop-zone.drag-over {
+  border-color: var(--ci-accent);
+  background: var(--ci-accent-light);
+}
+
+.drop-zone-icon {
+  font-size: 3rem;
+  color: var(--ci-medium-gray);
+  margin-bottom: var(--spacing-md);
+}
+
+.drop-zone-text {
+  color: var(--ci-dark-gray);
+  font-weight: 500;
+}
+
+.drop-zone-hint {
+  color: var(--ci-medium-gray);
+  font-size: 0.875rem;
+  margin-top: var(--spacing-xs);
+}
+
+/* ============================================
+   Syntax Highlighting for Editor
+   ============================================ */
+.editor-syntax .md-heading {
+  color: var(--ci-accent);
+  font-weight: bold;
+}
+
+.editor-syntax .md-bold {
+  color: var(--ci-dark-gray);
+  font-weight: bold;
+}
+
+.editor-syntax .md-italic {
+  color: var(--ci-dark-gray);
+  font-style: italic;
+}
+
+.editor-syntax .md-code {
+  background: var(--ci-light-gray);
+  color: var(--ci-accent);
+  font-family: var(--font-mono);
+  padding: 2px 4px;
+  border-radius: var(--radius-sm);
+}
+
+.editor-syntax .md-link {
+  color: var(--ci-info);
+  text-decoration: underline;
+}
+
+.editor-syntax .md-list {
+  color: var(--ci-accent);
+}
+
+.editor-syntax .md-blockquote {
+  color: var(--ci-medium-gray);
+  border-left: 3px solid var(--ci-accent);
+  padding-left: var(--spacing-md);
+}
+
+/* ============================================
+   ASCII Art Generator Styles
+   ============================================ */
+.ascii-preview {
+  font-family: var(--font-mono);
+  font-size: 12px;
+  line-height: 1.2;
+  background: var(--ci-black);
+  color: #00ff00;
+  padding: var(--spacing-md);
+  border-radius: var(--radius-md);
+  overflow-x: auto;
+  white-space: pre;
+}
+
+.ascii-controls {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--spacing-sm);
+  margin-bottom: var(--spacing-md);
+}
+
+/* ============================================
+   Table Generator Styles
+   ============================================ */
+.table-generator-grid {
+  display: grid;
+  gap: 1px;
+  background: var(--ci-border);
+  border: 1px solid var(--ci-border);
+  border-radius: var(--radius-md);
+  overflow: hidden;
+}
+
+.table-generator-cell {
+  background: var(--ci-white);
+  padding: var(--spacing-sm);
+  min-width: 80px;
+  min-height: 32px;
+}
+
+.table-generator-cell input {
+  width: 100%;
+  border: none;
+  background: transparent;
+  text-align: center;
+  font-family: var(--font-mono);
+}
+
+.table-generator-cell.header {
+  background: var(--ci-light-gray);
+  font-weight: 600;
+}
+
+/* ============================================
+   PDF Viewer/Editor Styles
+   ============================================ */
+.pdf-viewer {
+  background: var(--ci-dark-gray);
+  padding: var(--spacing-md);
+  border-radius: var(--radius-md);
+  min-height: 400px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.pdf-page {
+  background: var(--ci-white);
+  box-shadow: var(--shadow-lg);
+  max-width: 100%;
+}
+
+.pdf-toolbar {
+  display: flex;
+  align-items: center;
+  gap: var(--spacing-sm);
+  padding: var(--spacing-sm);
+  background: var(--ci-light-gray);
+  border-radius: var(--radius-md);
+  margin-bottom: var(--spacing-md);
+}
+
+/* ============================================
+   Dark Mode for ConcreteInfo Theme
+   ============================================ */
+body.theme-concreteinfo-dark {
+  --ci-bg: #1a1a1a;
+  --ci-white: #2a2a2a;
+  --ci-light-gray: #3a3a3a;
+  --ci-border: #4a4a4a;
+}
+
+body.theme-concreteinfo-dark .editor-textarea,
+body.theme-concreteinfo-dark .preview-content {
+  background: #2a2a2a;
+  color: #e0e0e0;
+}
+
+body.theme-concreteinfo-dark .modal-content {
+  background: #2a2a2a;
+  color: #e0e0e0;
+}
+
+body.theme-concreteinfo-dark .modal-body {
+  background: #2a2a2a;
+}
+
+body.theme-concreteinfo-dark .modal-footer {
+  background: #1a1a1a;
+}
+
+/* ============================================
+   Animations
+   ============================================ */
+@keyframes fadeIn {
+  from { opacity: 0; }
+  to { opacity: 1; }
+}
+
+@keyframes slideUp {
+  from { transform: translateY(20px); opacity: 0; }
+  to { transform: translateY(0); opacity: 1; }
+}
+
+@keyframes pulse {
+  0%, 100% { transform: scale(1); }
+  50% { transform: scale(1.05); }
+}
+
+.animate-fade-in {
+  animation: fadeIn var(--transition-normal);
+}
+
+.animate-slide-up {
+  animation: slideUp var(--transition-normal);
+}
+
+.animate-pulse {
+  animation: pulse 2s infinite;
+}
+
+/* ============================================
+   Responsive Design
+   ============================================ */
+@media (max-width: 768px) {
+  .modal-content {
+    width: 95%;
+    max-height: 90vh;
+  }
+
+  .converter-grid {
+    grid-template-columns: 1fr;
+  }
+
+  .app-header {
+    flex-wrap: wrap;
+  }
+}
+
+/* ============================================
+   Concrete Dark Theme
+   ============================================ */
+body.theme-concrete-dark {
+  background: #1a1a1a;
+  color: #e3e3e3;
+}
+
+body.theme-concrete-dark .toolbar {
+  background: linear-gradient(135deg, #0d0b09 0%, #1a1a1a 100%);
+  border-bottom: 3px solid #e5461f;
+}
+
+body.theme-concrete-dark .toolbar button {
+  color: #e3e3e3;
+}
+
+body.theme-concrete-dark .toolbar button:hover {
+  background: #e5461f;
+}
+
+body.theme-concrete-dark .tab-bar {
+  background: #0d0b09;
+  border-bottom: 2px solid #e5461f;
+}
+
+body.theme-concrete-dark .tab {
+  background: #2a2a2a;
+  color: #e3e3e3;
+  border-radius: 4px 4px 0 0;
+}
+
+body.theme-concrete-dark .tab.active {
+  background: #464646;
+  border-bottom: 2px solid #e5461f;
+}
+
+body.theme-concrete-dark .editor-textarea,
+body.theme-concrete-dark .editor-pane {
+  background: #1a1a1a;
+  color: #e3e3e3;
+}
+
+body.theme-concrete-dark .preview-content {
+  background: #1a1a1a;
+  color: #e3e3e3;
+}
+
+body.theme-concrete-dark .status-bar {
+  background: #0d0b09;
+  color: #9a9696;
+  border-top: 1px solid #464646;
+}
+
+body.theme-concrete-dark .export-dialog-content,
+body.theme-concrete-dark .batch-dialog-content {
+  background: #2a2a2a;
+  color: #e3e3e3;
+}
+
+body.theme-concrete-dark .export-dialog-header,
+body.theme-concrete-dark .batch-dialog-header {
+  background: #1a1a1a;
+  border-bottom: 2px solid #e5461f;
+}
+
+body.theme-concrete-dark .export-dialog-footer,
+body.theme-concrete-dark .batch-dialog-footer {
+  background: #1a1a1a;
+}
+
+body.theme-concrete-dark input,
+body.theme-concrete-dark select,
+body.theme-concrete-dark textarea {
+  background: #1a1a1a;
+  color: #e3e3e3;
+  border-color: #464646;
+}
+
+body.theme-concrete-dark input:focus,
+body.theme-concrete-dark select:focus,
+body.theme-concrete-dark textarea:focus {
+  border-color: #e5461f;
+}
+
+body.theme-concrete-dark .line-numbers {
+  background: #0d0b09;
+  color: #9a9696;
+}
+
+/* ============================================
+   Concrete Light Theme
+   ============================================ */
+body.theme-concrete-light {
+  background: #f5f5f5;
+  color: #464646;
+}
+
+body.theme-concrete-light .toolbar {
+  background: #ffffff;
+  border-bottom: 3px solid #e5461f;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
+}
+
+body.theme-concrete-light .toolbar button {
+  color: #464646;
+}
+
+body.theme-concrete-light .toolbar button:hover {
+  background: #e5461f;
+  color: #ffffff;
+}
+
+body.theme-concrete-light .tab-bar {
+  background: #ffffff;
+  border-bottom: 2px solid #e3e3e3;
+}
+
+body.theme-concrete-light .tab {
+  background: #f5f5f5;
+  color: #464646;
+  border-radius: 4px 4px 0 0;
+}
+
+body.theme-concrete-light .tab.active {
+  background: #ffffff;
+  border-bottom: 2px solid #e5461f;
+  color: #e5461f;
+}
+
+body.theme-concrete-light .editor-textarea,
+body.theme-concrete-light .editor-pane {
+  background: #ffffff;
+  color: #464646;
+}
+
+body.theme-concrete-light .preview-content {
+  background: #ffffff;
+  color: #464646;
+}
+
+body.theme-concrete-light .status-bar {
+  background: #ffffff;
+  color: #9a9696;
+  border-top: 1px solid #e3e3e3;
+}
+
+body.theme-concrete-light .export-dialog-content,
+body.theme-concrete-light .batch-dialog-content {
+  background: #ffffff;
+  color: #464646;
+}
+
+body.theme-concrete-light .export-dialog-header,
+body.theme-concrete-light .batch-dialog-header {
+  background: #f5f5f5;
+  border-bottom: 2px solid #e5461f;
+}
+
+body.theme-concrete-light .line-numbers {
+  background: #f5f5f5;
+  color: #9a9696;
+}
+
+/* ============================================
+   Concrete Warm Theme
+   ============================================ */
+body.theme-concrete-warm {
+  background: #faf8f5;
+  color: #464646;
+}
+
+body.theme-concrete-warm .toolbar {
+  background: linear-gradient(135deg, #464646 0%, #5a5a5a 100%);
+  border-bottom: 3px solid #e5461f;
+}
+
+body.theme-concrete-warm .toolbar button {
+  color: #faf8f5;
+}
+
+body.theme-concrete-warm .toolbar button:hover {
+  background: #e5461f;
+}
+
+body.theme-concrete-warm .tab-bar {
+  background: #464646;
+  border-bottom: 2px solid #e5461f;
+}
+
+body.theme-concrete-warm .tab {
+  background: #6a6a6a;
+  color: #faf8f5;
+  border-radius: 4px 4px 0 0;
+}
+
+body.theme-concrete-warm .tab.active {
+  background: #faf8f5;
+  color: #e5461f;
+  border-bottom: 2px solid #e5461f;
+}
+
+body.theme-concrete-warm .editor-textarea,
+body.theme-concrete-warm .editor-pane {
+  background: #faf8f5;
+  color: #464646;
+}
+
+body.theme-concrete-warm .preview-content {
+  background: #faf8f5;
+  color: #464646;
+}
+
+body.theme-concrete-warm .status-bar {
+  background: #f0ebe4;
+  color: #9a9696;
+  border-top: 1px solid #e3e3e3;
+}
+
+body.theme-concrete-warm .export-dialog-content,
+body.theme-concrete-warm .batch-dialog-content {
+  background: #faf8f5;
+  color: #464646;
+}
+
+body.theme-concrete-warm .export-dialog-header,
+body.theme-concrete-warm .batch-dialog-header {
+  background: #f0ebe4;
+  border-bottom: 2px solid #e5461f;
+}
+
+body.theme-concrete-warm h1,
+body.theme-concrete-warm h2,
+body.theme-concrete-warm h3,
+body.theme-concrete-warm h4,
+body.theme-concrete-warm h5,
+body.theme-concrete-warm h6 {
+  color: #e5461f;
+}
+
+body.theme-concrete-warm a {
+  color: #e5461f;
+}
+
+body.theme-concrete-warm .line-numbers {
+  background: #f0ebe4;
+  color: #9a9696;
+}

src/styles-sidebar.css

@@ -0,0 +1,268 @@
+/* Sidebar */
+.main-content {
+    display: flex;
+    flex: 1;
+    overflow: hidden;
+    min-height: 0;
+}
+
+.sidebar {
+    display: flex;
+    flex-shrink: 0;
+    height: 100%;
+    transition: width 0.2s ease;
+}
+
+.sidebar.collapsed {
+    width: 48px;
+}
+
+.sidebar:not(.collapsed) {
+    width: 328px; /* 48px icons + 280px panel */
+}
+
+.sidebar-icons {
+    display: flex;
+    flex-direction: column;
+    width: 48px;
+    background: var(--gray-100, #f3f4f6);
+    border-right: 1px solid var(--gray-200, #e5e7eb);
+    padding: 8px 0;
+    gap: 4px;
+    align-items: center;
+}
+
+.sidebar-icon {
+    width: 36px;
+    height: 36px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    border: none;
+    background: transparent;
+    border-radius: 8px;
+    cursor: pointer;
+    color: var(--gray-500, #6b7280);
+    transition: all 0.15s ease;
+}
+
+.sidebar-icon:hover {
+    background: var(--gray-200, #e5e7eb);
+    color: var(--gray-700, #374151);
+}
+
+.sidebar-icon.active {
+    background: var(--gray-200, #e5e7eb);
+    color: var(--primary-dark, #5661b3);
+    box-shadow: inset 3px 0 0 var(--primary-dark, #5661b3);
+}
+
+.sidebar-panel {
+    width: 280px;
+    background: var(--gray-50, #f9fafb);
+    border-right: 1px solid var(--gray-200, #e5e7eb);
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+}
+
+.sidebar.collapsed .sidebar-panel {
+    display: none;
+}
+
+.sidebar-panel-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 12px 16px;
+    border-bottom: 1px solid var(--gray-200, #e5e7eb);
+    font-weight: 600;
+    font-size: 13px;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    color: var(--gray-600, #4b5563);
+}
+
+.sidebar-panel-close {
+    background: none;
+    border: none;
+    font-size: 18px;
+    cursor: pointer;
+    color: var(--gray-400, #9ca3af);
+    padding: 0 4px;
+    border-radius: 4px;
+}
+
+.sidebar-panel-close:hover {
+    background: var(--gray-200, #e5e7eb);
+    color: var(--gray-600, #4b5563);
+}
+
+.sidebar-panel-content {
+    flex: 1;
+    overflow-y: auto;
+    padding: 12px;
+}
+
+/* Dark theme support */
+body[class*="dark"] .sidebar-icons,
+body[class*="dark"] .sidebar-panel {
+    background: #1e1e1e;
+    border-color: #333;
+}
+
+body[class*="dark"] .sidebar-icon {
+    color: #888;
+}
+
+body[class*="dark"] .sidebar-icon:hover {
+    background: #333;
+    color: #ccc;
+}
+
+body[class*="dark"] .sidebar-icon.active {
+    background: #333;
+    color: #8b9aff;
+    box-shadow: inset 3px 0 0 #8b9aff;
+}
+
+body[class*="dark"] .sidebar-panel-header {
+    border-color: #333;
+    color: #ccc;
+}
+
+/* Panel list items (templates, etc.) */
+.panel-list-item {
+    padding: 10px 12px;
+    border-radius: 6px;
+    cursor: pointer;
+    margin-bottom: 4px;
+}
+.panel-list-item:hover {
+    background: var(--gray-200, #e5e7eb);
+}
+.panel-list-item-title {
+    font-size: 13px;
+    font-weight: 500;
+    color: var(--gray-800, #1f2937);
+}
+.panel-list-item-desc {
+    font-size: 11px;
+    color: var(--gray-500, #6b7280);
+    margin-top: 2px;
+}
+
+body[class*="dark"] .panel-list-item:hover {
+    background: #333;
+}
+body[class*="dark"] .panel-list-item-title {
+    color: #ddd;
+}
+body[class*="dark"] .panel-list-item-desc {
+    color: #888;
+}
+
+/* Explorer Panel */
+.explorer-toolbar {
+    display: flex;
+    gap: 4px;
+    margin-bottom: 8px;
+}
+.explorer-path {
+    flex: 1;
+    padding: 6px 8px;
+    border: 1px solid var(--gray-300, #d1d5db);
+    border-radius: 6px;
+    font-size: 12px;
+    background: white;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+.explorer-browse-btn {
+    border: 1px solid var(--gray-300, #d1d5db);
+    border-radius: 6px;
+    background: white;
+    cursor: pointer;
+    padding: 4px 8px;
+}
+.tree-item {
+    padding: 3px 0;
+    cursor: pointer;
+    font-size: 13px;
+    user-select: none;
+}
+.tree-item:hover {
+    background: var(--gray-100, #f3f4f6);
+    border-radius: 4px;
+}
+.tree-icon {
+    margin-right: 4px;
+    font-size: 12px;
+}
+.tree-children {
+    padding-left: 16px;
+}
+.tree-folder.collapsed .tree-children {
+    display: none;
+}
+.tree-name {
+    font-size: 13px;
+}
+
+/* Git Panel */
+.git-section { margin-bottom: 16px; }
+.git-section-title { font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--gray-500); margin-bottom: 8px; }
+.git-file { display: flex; align-items: center; padding: 4px 6px; border-radius: 4px; font-size: 13px; gap: 6px; }
+.git-file:hover { background: var(--gray-100, #f3f4f6); }
+.git-file-status { font-weight: 700; font-family: monospace; width: 16px; text-align: center; }
+.git-file-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.git-stage-btn { border: none; background: var(--gray-200); border-radius: 4px; cursor: pointer; font-size: 14px; width: 22px; height: 22px; }
+.git-commit-input { width: 100%; padding: 8px; border: 1px solid var(--gray-300); border-radius: 6px; font-size: 13px; font-family: inherit; resize: vertical; box-sizing: border-box; }
+.git-commit-btn { width: 100%; margin-top: 8px; padding: 8px; background: var(--primary-dark, #5661b3); color: white; border: none; border-radius: 6px; font-size: 13px; cursor: pointer; }
+.git-commit-btn:hover { opacity: 0.9; }
+.git-log-entry { padding: 6px 0; border-bottom: 1px solid var(--gray-100); }
+.git-log-msg { font-size: 13px; }
+.git-log-meta { font-size: 11px; color: var(--gray-500); margin-top: 2px; }
+.git-info { font-size: 13px; color: var(--gray-500); padding: 8px 0; }
+.git-loading { font-size: 13px; color: var(--gray-400); }
+
+/* Snippets Panel */
+.snippets-toolbar { display: flex; gap: 4px; margin-bottom: 8px; }
+.snippets-search { flex: 1; padding: 6px 10px; border: 1px solid var(--gray-300); border-radius: 6px; font-size: 13px; }
+.snippets-add-btn { width: 32px; border: 1px solid var(--gray-300); border-radius: 6px; background: white; font-size: 18px; cursor: pointer; }
+.snippet-item { padding: 8px; border: 1px solid var(--gray-200); border-radius: 6px; margin-bottom: 6px; }
+.snippet-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
+.snippet-name { font-size: 13px; font-weight: 500; }
+.snippet-lang { font-size: 11px; background: var(--gray-100); padding: 2px 6px; border-radius: 4px; color: var(--gray-500); }
+.snippet-preview { font-size: 12px; background: var(--gray-50); padding: 6px; border-radius: 4px; margin: 4px 0; overflow: hidden; max-height: 60px; }
+.snippet-preview code { font-family: 'JetBrains Mono', monospace; }
+.snippet-actions { display: flex; gap: 4px; }
+.snippet-insert { font-size: 12px; padding: 4px 8px; border: 1px solid var(--gray-300); border-radius: 4px; background: white; cursor: pointer; }
+.snippet-delete { font-size: 14px; padding: 4px 8px; border: 1px solid var(--gray-300); border-radius: 4px; background: white; cursor: pointer; color: #ef4444; }
+
+/* Dark theme for sidebar panels */
+body[class*="dark"] .explorer-path,
+body[class*="dark"] .explorer-browse-btn,
+body[class*="dark"] .snippets-search,
+body[class*="dark"] .snippets-add-btn,
+body[class*="dark"] .snippet-insert,
+body[class*="dark"] .snippet-delete {
+    background: #2d2d2d;
+    border-color: #444;
+    color: #ccc;
+}
+body[class*="dark"] .git-commit-input {
+    background: #2d2d2d;
+    border-color: #444;
+    color: #ccc;
+}
+body[class*="dark"] .snippet-item {
+    border-color: #444;
+}
+body[class*="dark"] .snippet-preview {
+    background: #2d2d2d;
+}
+body[class*="dark"] .tree-item:hover,
+body[class*="dark"] .git-file:hover {
+    background: #333;
+}

src/styles-welcome.css

@@ -0,0 +1,24 @@
+.welcome-container { padding: 40px; max-width: 900px; margin: 0 auto; }
+.welcome-hero { text-align: center; margin-bottom: 40px; }
+.welcome-title { font-size: 32px; font-weight: 700; color: var(--gray-800, #1f2937); }
+.welcome-version { font-size: 14px; color: var(--primary-dark, #5661b3); margin-top: 4px; font-weight: 500; }
+.welcome-subtitle { font-size: 16px; color: var(--gray-500, #6b7280); margin-top: 8px; }
+.welcome-grid { display: grid; gap: 32px; }
+.welcome-section h2 { font-size: 18px; margin-bottom: 16px; color: var(--gray-700, #374151); }
+.welcome-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
+.welcome-card { padding: 20px; border: 1px solid var(--gray-200, #e5e7eb); border-radius: 12px; cursor: pointer; text-align: center; transition: all 0.2s; }
+.welcome-card:hover { border-color: var(--primary-dark, #5661b3); box-shadow: 0 4px 12px rgba(0,0,0,0.08); transform: translateY(-2px); }
+.welcome-card-icon { font-size: 28px; margin-bottom: 8px; }
+.welcome-card h3 { font-size: 15px; margin-bottom: 4px; }
+.welcome-card p { font-size: 13px; color: var(--gray-500); }
+.welcome-card kbd { display: inline-block; margin-top: 8px; padding: 2px 8px; background: var(--gray-100); border: 1px solid var(--gray-300); border-radius: 4px; font-size: 12px; font-family: 'JetBrains Mono', monospace; }
+.welcome-features { list-style: none; padding: 0; }
+.welcome-features li { padding: 6px 0; font-size: 14px; border-bottom: 1px solid var(--gray-100, #f3f4f6); }
+.welcome-features strong { color: var(--primary-dark, #5661b3); }
+.welcome-recent-item { padding: 8px 12px; border-radius: 6px; cursor: pointer; margin-bottom: 4px; }
+.welcome-recent-item:hover { background: var(--gray-100); }
+.welcome-recent-name { font-size: 14px; font-weight: 500; display: block; }
+.welcome-recent-path { font-size: 12px; color: var(--gray-500); display: block; margin-top: 2px; overflow: hidden; text-overflow: ellipsis; }
+.welcome-muted { color: var(--gray-400); font-size: 14px; }
+.welcome-footer { margin-top: 32px; text-align: center; }
+.welcome-checkbox { font-size: 13px; color: var(--gray-500); cursor: pointer; }

src/styles.css

@@ -10,6 +10,10 @@ body {
     height: 100vh;
 }
 
+.hidden {
+    display: none !important;
+}
+
 .container {
     display: flex;
     flex-direction: column;
@@ -135,11 +139,18 @@ body {
     background: #d0d0d0;
 }
 
+.toolbar-group {
+    display: flex;
+    align-items: center;
+    gap: 2px;
+}
 .toolbar-separator {
     width: 1px;
-    height: 24px;
-    background: #ccc;
-    margin: 0 8px;
+    height: 20px;
+    background: rgba(0, 0, 0, 0.12);
+    margin: 0 6px;
+    align-self: center;
+    flex-shrink: 0;
 }
 
 /* Editor Container */
@@ -156,9 +167,28 @@ body {
 }
 
 .pane:first-child {
-    border-right: 1px solid #ddd;
+    border-right: none;
 }
 
+/* Pane Resizer */
+.pane-resizer {
+    width: 6px;
+    background: #e0e0e0;
+    cursor: col-resize;
+    position: relative;
+    flex-shrink: 0;
+    transition: background 0.2s;
+}
+
+.pane-resizer:hover {
+    background: #999;
+}
+
+.pane-resizer:active {
+    background: #666;
+}
+
+
 .editor-textarea {
     width: 100%;
     height: 100%;
@@ -171,6 +201,20 @@ body {
     resize: none;
 }
 
+/* CodeMirror container */
+.codemirror-container {
+    height: 100%;
+    overflow: auto;
+}
+.codemirror-container .cm-editor {
+    height: 100%;
+    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
+    font-size: 14px;
+}
+.codemirror-container .cm-scroller {
+    overflow: auto;
+}
+
 .pane:last-child {
     padding: 0;
     background: #fff;
@@ -207,21 +251,78 @@ body {
     background: #fff;
 }
 
-#preview {
+/* GitHub Light Theme for Preview (Default) */
+#preview, [id^="preview-"], .preview-content {
     max-width: 800px;
     margin: 0 auto;
     font-size: 15px;
+    padding: 20px;
+    background: #ffffff;
+    color: #24292f;
+    line-height: 1.6;
 }
 
+/* Bottom Panel (REPL Output) */
+.bottom-panel { display: flex; flex-direction: column; border-top: 1px solid var(--gray-200, #e5e7eb); flex-shrink: 0; }
+.bottom-panel.collapsed { height: 0; overflow: hidden; border: none; }
+.bottom-panel:not(.collapsed) { height: 200px; }
+.bottom-panel-header { display: flex; justify-content: space-between; align-items: center; padding: 6px 12px; background: var(--gray-50, #f9fafb); border-bottom: 1px solid var(--gray-200); }
+.bottom-panel-title { font-size: 13px; font-weight: 600; color: var(--gray-600); }
+.bottom-panel-actions { display: flex; gap: 4px; }
+.bottom-panel-btn { font-size: 12px; padding: 4px 8px; border: 1px solid var(--gray-300); border-radius: 4px; background: white; cursor: pointer; }
+.bottom-panel-content { flex: 1; overflow-y: auto; padding: 12px; font-family: 'JetBrains Mono', monospace; font-size: 13px; background: #1e1e1e; color: #d4d4d4; }
+.repl-entry { margin-bottom: 8px; }
+.repl-command { color: #569cd6; margin-bottom: 2px; }
+.repl-stdout { color: #d4d4d4; white-space: pre-wrap; }
+.repl-stderr { color: #f44747; white-space: pre-wrap; }
+.repl-error { color: #f44747; }
+
+/* Code Run Button */
+.code-run-btn {
+    position: absolute;
+    top: 6px;
+    right: 6px;
+    padding: 4px 10px;
+    font-size: 12px;
+    background: var(--primary-dark, #5661b3);
+    color: white;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+    opacity: 0;
+    transition: opacity 0.2s;
+}
+pre:hover .code-run-btn { opacity: 1; }
+
+/* Dark theme bottom panel */
+body[class*="dark"] .bottom-panel-header { background: #1e1e1e; border-color: #333; }
+body[class*="dark"] .bottom-panel-btn { background: #2d2d2d; border-color: #444; color: #ccc; }
+body[class*="dark"] .bottom-panel-title { color: #ccc; }
+
 /* Status Bar */
 .status-bar {
     display: flex;
     justify-content: space-between;
-    padding: 4px 12px;
+    align-items: center;
+    padding: 2px 12px;
     background: #f5f5f5;
     border-top: 1px solid #ddd;
     font-size: 12px;
     color: #666;
+    min-height: 24px;
+    flex-shrink: 0;
+}
+.status-bar-left, .status-bar-right {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+}
+.status-separator {
+    color: var(--gray-300, #d1d5db);
+    margin: 0 2px;
+}
+.status-item {
+    white-space: nowrap;
 }
 
 /* Preview Styles */
@@ -251,22 +352,25 @@ body {
     line-height: 1.6;
 }
 
-#preview code, .preview-content code {
+#preview code, .preview-content code, [id^="preview-"] code {
     padding: 0.2em 0.4em;
     margin: 0;
     font-size: 85%;
-    background-color: rgba(27,31,35,0.05);
-    border-radius: 3px;
-    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
+    background-color: #f6f8fa;
+    border: 1px solid #d0d7de;
+    border-radius: 6px;
+    font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, 'Liberation Mono', monospace;
+    color: #24292f;
 }
 
-#preview pre, .preview-content pre {
+#preview pre, .preview-content pre, [id^="preview-"] pre {
     padding: 16px;
     overflow: auto;
     font-size: 85%;
     line-height: 1.45;
     background-color: #f6f8fa;
-    border-radius: 3px;
+    border: 1px solid #d0d7de;
+    border-radius: 6px;
     margin-bottom: 16px;
 }
 
@@ -289,6 +393,126 @@ body {
     margin-bottom: 16px;
 }
 
+/* GitHub Dark Theme for Preview */
+body.theme-dark #preview,
+body.theme-dark [id^="preview-"],
+body.theme-dark .preview-content {
+    background: #0d1117;
+    color: #c9d1d9;
+}
+
+body.theme-dark #preview h1,
+body.theme-dark [id^="preview-"] h1,
+body.theme-dark .preview-content h1 {
+    color: #c9d1d9;
+    border-bottom-color: #21262d;
+}
+
+body.theme-dark #preview h2,
+body.theme-dark [id^="preview-"] h2,
+body.theme-dark .preview-content h2 {
+    color: #c9d1d9;
+    border-bottom-color: #21262d;
+}
+
+body.theme-dark #preview h3,
+body.theme-dark #preview h4,
+body.theme-dark #preview h5,
+body.theme-dark #preview h6,
+body.theme-dark [id^="preview-"] h3,
+body.theme-dark [id^="preview-"] h4,
+body.theme-dark [id^="preview-"] h5,
+body.theme-dark [id^="preview-"] h6,
+body.theme-dark .preview-content h3,
+body.theme-dark .preview-content h4,
+body.theme-dark .preview-content h5,
+body.theme-dark .preview-content h6 {
+    color: #c9d1d9;
+}
+
+body.theme-dark #preview p,
+body.theme-dark [id^="preview-"] p,
+body.theme-dark .preview-content p {
+    color: #c9d1d9;
+}
+
+body.theme-dark #preview code,
+body.theme-dark [id^="preview-"] code,
+body.theme-dark .preview-content code {
+    background-color: #161b22;
+    border-color: #30363d;
+    color: #c9d1d9;
+}
+
+body.theme-dark #preview pre,
+body.theme-dark [id^="preview-"] pre,
+body.theme-dark .preview-content pre {
+    background-color: #161b22;
+    border-color: #30363d;
+}
+
+body.theme-dark #preview blockquote,
+body.theme-dark [id^="preview-"] blockquote,
+body.theme-dark .preview-content blockquote {
+    color: #8b949e;
+    border-left-color: #3b434b;
+}
+
+body.theme-dark #preview a,
+body.theme-dark [id^="preview-"] a,
+body.theme-dark .preview-content a {
+    color: #58a6ff;
+}
+
+body.theme-dark #preview a:hover,
+body.theme-dark [id^="preview-"] a:hover,
+body.theme-dark .preview-content a:hover {
+    color: #79c0ff;
+}
+
+body.theme-dark #preview table,
+body.theme-dark [id^="preview-"] table,
+body.theme-dark .preview-content table {
+    border-color: #30363d;
+}
+
+body.theme-dark #preview table th,
+body.theme-dark [id^="preview-"] table th,
+body.theme-dark .preview-content table th {
+    background-color: #161b22;
+    color: #c9d1d9;
+    border-color: #30363d;
+}
+
+body.theme-dark #preview table td,
+body.theme-dark [id^="preview-"] table td,
+body.theme-dark .preview-content table td {
+    border-color: #30363d;
+    color: #c9d1d9;
+}
+
+body.theme-dark #preview hr,
+body.theme-dark [id^="preview-"] hr,
+body.theme-dark .preview-content hr {
+    background-color: #21262d;
+    border-color: #21262d;
+}
+
+body.theme-dark #preview ul,
+body.theme-dark #preview ol,
+body.theme-dark [id^="preview-"] ul,
+body.theme-dark [id^="preview-"] ol,
+body.theme-dark .preview-content ul,
+body.theme-dark .preview-content ol {
+    color: #c9d1d9;
+}
+
+body.theme-dark #preview li,
+body.theme-dark [id^="preview-"] li,
+body.theme-dark .preview-content li {
+    color: #c9d1d9;
+}
+
 #preview ul, #preview ol, .preview-content ul, .preview-content ol {
     padding-left: 2em;
     margin-bottom: 16px;
@@ -326,10 +550,11 @@ body {
 
 #preview table th, .preview-content table th {
     font-weight: 600;
+    background-color: #f6f8fa;
 }
 
 #preview table tr:nth-child(2n), .preview-content table tr:nth-child(2n) {
-    background-color: #f6f8fa;
+    background-color: #ffffff;
 }
 
 /* Theme: Dark */
@@ -851,52 +1076,82 @@ body.theme-github .status-bar {
 
 .export-dialog-content {
     background: #fff;
-    border-radius: 8px;
-    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
-    width: 90%;
-    max-width: 600px;
-    max-height: 90vh;
+    border-radius: 6px;
+    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
+    width: 85%;
+    max-width: 450px;
+    max-height: 80vh;
     overflow-y: auto;
     position: relative;
+    font-size: 12px;
 }
 
 .export-dialog-header {
     display: flex;
     align-items: center;
     justify-content: space-between;
-    padding: 16px 20px;
+    padding: 12px 16px;
     border-bottom: 1px solid #eee;
 }
 
 .export-dialog-header h3 {
     margin: 0;
-    font-size: 18px;
+    font-size: 14px;
     font-weight: 600;
 }
 
 .export-dialog-body {
-    padding: 20px;
+    padding: 14px 16px;
 }
 
 .export-section {
-    margin-bottom: 20px;
+    margin-bottom: 14px;
 }
 
 .export-section label {
     display: block;
-    font-weight: 600;
-    margin-bottom: 8px;
+    font-weight: 500;
+    margin-bottom: 4px;
     color: #333;
+    font-size: 12px;
+}
+
+.export-section label.checkbox-inline {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    cursor: pointer;
+    font-weight: 400;
+}
+
+.export-section label.checkbox-inline input[type="checkbox"] {
+    width: auto;
+    margin: 0;
+}
+
+/* PDF Editor buttons */
+#add-merge-file {
+    padding: 5px 10px;
+    font-size: 12px;
+    background: #4a90d9;
+    color: #fff;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+}
+
+#add-merge-file:hover {
+    background: #357abd;
 }
 
 .export-section select,
 .export-section input[type="text"],
 .export-section input[type="number"] {
     width: 100%;
-    padding: 8px 12px;
+    padding: 5px 8px;
     border: 1px solid #ddd;
     border-radius: 4px;
-    font-size: 14px;
+    font-size: 12px;
 }
 
 .export-section select:focus,
@@ -1100,9 +1355,10 @@ body.theme-dark #add-metadata-field {
 
 /* PDF Editor Specific Styles */
 .pdf-editor-content {
-    max-width: 600px !important;
-    max-height: 85vh;
+    max-width: 450px !important;
+    max-height: 75vh;
     overflow-y: auto;
+    font-size: 12px;
 }
 
 .pdf-editor-body {
@@ -1238,12 +1494,13 @@ body.theme-dark #export-dialog-close:hover {
 
 .batch-dialog-content {
     background: #fff;
-    border-radius: 8px;
-    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
-    width: 90%;
-    max-width: 500px;
-    max-height: 80vh;
+    border-radius: 6px;
+    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
+    width: 85%;
+    max-width: 450px;
+    max-height: 75vh;
     overflow-y: auto;
+    font-size: 12px;
 }
 
 .batch-dialog-header {
@@ -1516,6 +1773,42 @@ body.theme-github .line-numbers {
     color: #586069;
 }
 
+/* Export Profiles Styles */
+.export-profiles {
+    border-bottom: 1px solid #ddd;
+    padding-bottom: 15px;
+    margin-bottom: 15px;
+}
+
+.profile-controls {
+    display: flex;
+    gap: 8px;
+    align-items: center;
+    margin-top: 8px;
+}
+
+.profile-controls select {
+    flex: 1;
+    padding: 8px;
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    font-size: 14px;
+}
+
+.profile-controls button {
+    padding: 8px 12px;
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    background: #f5f5f5;
+    cursor: pointer;
+    font-size: 13px;
+    transition: all 0.2s;
+}
+
+.profile-controls button:hover {
+    background: #e8e8e8;
+}
+
 /* Advanced Export Toggle Styles */
 .export-mode-toggle {
     border-bottom: 1px solid #ddd;
@@ -2936,6 +3229,250 @@ body.theme-concrete-warm .status-bar {
     color: #e3e3e3;
 }
 
+/* ========================================
+   Sepia Theme - Warm reading theme
+   ======================================== */
+body.theme-sepia {
+    background: #f4ecd8;
+    color: #5b4636;
+}
+
+body.theme-sepia .tab-bar {
+    background: #e8dcc8;
+    border-bottom-color: #d4c4a8;
+}
+
+body.theme-sepia .tab {
+    background: #e8dcc8;
+    border-color: #d4c4a8;
+    color: #5b4636;
+}
+
+body.theme-sepia .tab.active {
+    background: #f4ecd8;
+    border-bottom-color: #8b7355;
+}
+
+body.theme-sepia .toolbar {
+    background: #e8dcc8;
+    border-bottom-color: #d4c4a8;
+}
+
+body.theme-sepia .toolbar button {
+    color: #5b4636;
+}
+
+body.theme-sepia .toolbar button:hover {
+    background: #d4c4a8;
+}
+
+body.theme-sepia .editor-textarea {
+    background: #f4ecd8;
+    color: #5b4636;
+}
+
+body.theme-sepia .pane:last-child {
+    background: #f4ecd8;
+}
+
+body.theme-sepia .preview-content {
+    color: #5b4636;
+}
+
+body.theme-sepia .preview-content h1,
+body.theme-sepia .preview-content h2 {
+    color: #3d2914;
+    border-bottom-color: #d4c4a8;
+}
+
+body.theme-sepia .preview-content code {
+    background: #e8dcc8;
+    color: #8b4513;
+}
+
+body.theme-sepia .preview-content pre {
+    background: #e8dcc8;
+    border-color: #d4c4a8;
+}
+
+body.theme-sepia .preview-content a {
+    color: #8b4513;
+}
+
+body.theme-sepia .preview-content blockquote {
+    border-left-color: #8b7355;
+    background: #e8dcc8;
+}
+
+body.theme-sepia .status-bar {
+    background: #e8dcc8;
+    border-top-color: #d4c4a8;
+    color: #5b4636;
+}
+
+/* ========================================
+   Paper Theme - Clean white paper
+   ======================================== */
+body.theme-paper {
+    background: #ffffff;
+    color: #1a1a1a;
+}
+
+body.theme-paper .tab-bar {
+    background: #f8f8f8;
+    border-bottom-color: #e0e0e0;
+}
+
+body.theme-paper .tab {
+    background: #f0f0f0;
+    border-color: #e0e0e0;
+    color: #333;
+}
+
+body.theme-paper .tab.active {
+    background: #ffffff;
+    border-bottom-color: #1a1a1a;
+}
+
+body.theme-paper .toolbar {
+    background: #f8f8f8;
+    border-bottom-color: #e0e0e0;
+}
+
+body.theme-paper .toolbar button {
+    color: #333;
+}
+
+body.theme-paper .toolbar button:hover {
+    background: #e8e8e8;
+}
+
+body.theme-paper .editor-textarea {
+    background: #ffffff;
+    color: #1a1a1a;
+}
+
+body.theme-paper .pane:last-child {
+    background: #ffffff;
+}
+
+body.theme-paper .preview-content {
+    color: #1a1a1a;
+}
+
+body.theme-paper .preview-content h1,
+body.theme-paper .preview-content h2 {
+    color: #000;
+    border-bottom-color: #e0e0e0;
+}
+
+body.theme-paper .preview-content code {
+    background: #f5f5f5;
+    color: #c41a16;
+}
+
+body.theme-paper .preview-content pre {
+    background: #f5f5f5;
+    border-color: #e0e0e0;
+}
+
+body.theme-paper .preview-content a {
+    color: #0366d6;
+}
+
+body.theme-paper .preview-content blockquote {
+    border-left-color: #ddd;
+    background: #f9f9f9;
+}
+
+body.theme-paper .status-bar {
+    background: #f8f8f8;
+    border-top-color: #e0e0e0;
+    color: #333;
+}
+
+/* ========================================
+   Rose Pine Dawn - Warm rose-tinted light
+   ======================================== */
+body.theme-rosepine-dawn {
+    background: #faf4ed;
+    color: #575279;
+}
+
+body.theme-rosepine-dawn .tab-bar {
+    background: #f2e9e1;
+    border-bottom-color: #dfdad9;
+}
+
+body.theme-rosepine-dawn .tab {
+    background: #f2e9e1;
+    border-color: #dfdad9;
+    color: #575279;
+}
+
+body.theme-rosepine-dawn .tab.active {
+    background: #faf4ed;
+    border-bottom-color: #907aa9;
+}
+
+body.theme-rosepine-dawn .toolbar {
+    background: #f2e9e1;
+    border-bottom-color: #dfdad9;
+}
+
+body.theme-rosepine-dawn .toolbar button {
+    color: #575279;
+}
+
+body.theme-rosepine-dawn .toolbar button:hover {
+    background: #dfdad9;
+}
+
+body.theme-rosepine-dawn .editor-textarea {
+    background: #faf4ed;
+    color: #575279;
+}
+
+body.theme-rosepine-dawn .pane:last-child {
+    background: #faf4ed;
+}
+
+body.theme-rosepine-dawn .preview-content {
+    color: #575279;
+}
+
+body.theme-rosepine-dawn .preview-content h1,
+body.theme-rosepine-dawn .preview-content h2 {
+    color: #286983;
+    border-bottom-color: #dfdad9;
+}
+
+body.theme-rosepine-dawn .preview-content code {
+    background: #f2e9e1;
+    color: #b4637a;
+}
+
+body.theme-rosepine-dawn .preview-content pre {
+    background: #f2e9e1;
+    border-color: #dfdad9;
+}
+
+body.theme-rosepine-dawn .preview-content a {
+    color: #56949f;
+}
+
+body.theme-rosepine-dawn .preview-content blockquote {
+    border-left-color: #907aa9;
+    background: #f2e9e1;
+    color: #797593;
+}
+
+body.theme-rosepine-dawn .status-bar {
+    background: #f2e9e1;
+    border-top-color: #dfdad9;
+    color: #575279;
+}
+
 /* Print Styles */
 @media print {
     /* Hide UI elements for clean print output */
@@ -3312,6 +3849,22 @@ body.printing-no-styles .preview-content pre,
     background: var(--button-hover, #5a6268);
 }
 
+.browse-btn {
+    padding: 6px 12px;
+    background: var(--accent-color, #007bff);
+    color: white;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 13px;
+    transition: background 0.2s ease;
+    margin-right: 8px;
+}
+
+.browse-btn:hover {
+    background: var(--accent-hover, #0056b3);
+}
+
 .clear-btn {
     padding: 6px 12px;
     background: var(--danger-color, #dc3545);
@@ -3430,3 +3983,78 @@ body[data-theme="dark"] .field-option:hover {
     background: #0d6efd;
     color: white;
 }
+/* Mermaid Diagram Styles */
+.mermaid {
+    background: #f9f9f9;
+    padding: 20px;
+    border-radius: 8px;
+    margin: 20px 0;
+    text-align: center;
+    border: 1px solid #e0e0e0;
+}
+
+.mermaid svg {
+    max-width: 100%;
+    height: auto;
+}
+
+body.theme-dark .mermaid {
+    background: #2d2d2d;
+    border-color: #444;
+}
+
+body.theme-solarized .mermaid {
+    background: #fdf6e3;
+    border-color: #eee8d5;
+}
+
+body.theme-monokai .mermaid {
+    background: #2f2f2f;
+    border-color: #49483e;
+}
+
+body.theme-github .mermaid {
+    background: #f6f8fa;
+    border-color: #e1e4e8;
+}
+
+/* Task List Styles */
+.preview-content input[type="checkbox"] {
+    margin-right: 6px;
+    pointer-events: none;
+}
+.preview-content li.task-list-item {
+    list-style: none;
+    margin-left: -20px;
+}
+
+/* Admonition Styles */
+.admonition {
+    border-left: 4px solid;
+    border-radius: 4px;
+    padding: 12px 16px;
+    margin: 16px 0;
+}
+.admonition-title {
+    font-weight: 600;
+    margin-bottom: 8px;
+}
+.admonition-note, .admonition-info { border-color: #3b82f6; background: #eff6ff; }
+.admonition-warning { border-color: #f59e0b; background: #fffbeb; }
+.admonition-tip { border-color: #10b981; background: #ecfdf5; }
+.admonition-danger { border-color: #ef4444; background: #fef2f2; }
+
+/* TOC Styles */
+.toc { background: #f9fafb; border: 1px solid #e5e7eb; border-radius: 8px; padding: 16px; margin: 16px 0; }
+.toc h2 { font-size: 14px; margin-bottom: 8px; }
+.toc ul { list-style: none; padding: 0; }
+.toc li { padding: 2px 0; }
+.toc .toc-h1 { padding-left: 0; }
+.toc .toc-h2 { padding-left: 16px; }
+.toc .toc-h3 { padding-left: 32px; }
+.toc .toc-h4 { padding-left: 48px; }
+.toc a { color: #5661b3; text-decoration: none; }
+.toc a:hover { text-decoration: underline; }
+
+/* Command Palette Styles */
+/* Command Palette styles moved to styles-modern.css */

src/table-generator.html

@@ -0,0 +1,545 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Table Generator - MarkdownConverter</title>
+    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap" rel="stylesheet">
+    <style>
+        :root {
+            --ci-dark-gray: #464646;
+            --ci-medium-gray: #9a9696;
+            --ci-accent: #e5461f;
+            --ci-light-gray: #e3e3e3;
+            --ci-black: #0d0b09;
+            --ci-white: #ffffff;
+            --ci-bg: #f5f5f5;
+        }
+
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+        }
+
+        body {
+            font-family: 'Inter', system-ui, sans-serif;
+            background: var(--ci-bg);
+            color: var(--ci-dark-gray);
+            min-height: 100vh;
+            display: flex;
+            flex-direction: column;
+        }
+
+        .header {
+            background: linear-gradient(135deg, var(--ci-dark-gray) 0%, var(--ci-black) 100%);
+            padding: 16px 24px;
+            border-bottom: 3px solid var(--ci-accent);
+            display: flex;
+            align-items: center;
+            justify-content: space-between;
+        }
+
+        .header h1 {
+            color: var(--ci-white);
+            font-size: 1.25rem;
+            font-weight: 600;
+        }
+
+        .container {
+            padding: 24px;
+            flex: 1;
+            overflow: auto;
+        }
+
+        .section {
+            background: var(--ci-white);
+            border-radius: 12px;
+            padding: 20px;
+            margin-bottom: 20px;
+            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
+        }
+
+        .section-title {
+            font-weight: 600;
+            margin-bottom: 16px;
+            color: var(--ci-dark-gray);
+            font-size: 0.95rem;
+        }
+
+        .controls-row {
+            display: flex;
+            gap: 16px;
+            flex-wrap: wrap;
+            margin-bottom: 20px;
+        }
+
+        .control-group {
+            display: flex;
+            flex-direction: column;
+            gap: 6px;
+        }
+
+        .control-label {
+            font-size: 0.8rem;
+            font-weight: 500;
+            color: var(--ci-medium-gray);
+        }
+
+        .form-input, .form-select {
+            padding: 8px 12px;
+            border: 2px solid var(--ci-light-gray);
+            border-radius: 6px;
+            font-size: 0.875rem;
+            font-family: inherit;
+            transition: border-color 0.2s;
+            min-width: 100px;
+        }
+
+        .form-input:focus, .form-select:focus {
+            outline: none;
+            border-color: var(--ci-accent);
+        }
+
+        .checkbox-label {
+            display: flex;
+            align-items: center;
+            gap: 8px;
+            font-size: 0.875rem;
+            cursor: pointer;
+        }
+
+        .checkbox-label input {
+            width: 16px;
+            height: 16px;
+            accent-color: var(--ci-accent);
+        }
+
+        .table-container {
+            overflow-x: auto;
+            margin-bottom: 20px;
+        }
+
+        .editable-table {
+            width: 100%;
+            border-collapse: collapse;
+            font-size: 0.875rem;
+        }
+
+        .editable-table th,
+        .editable-table td {
+            border: 1px solid var(--ci-light-gray);
+            padding: 0;
+        }
+
+        .editable-table th {
+            background: var(--ci-dark-gray);
+            color: var(--ci-white);
+        }
+
+        .editable-table input {
+            width: 100%;
+            padding: 10px 12px;
+            border: none;
+            font-family: inherit;
+            font-size: 0.875rem;
+            background: transparent;
+        }
+
+        .editable-table input:focus {
+            outline: 2px solid var(--ci-accent);
+            outline-offset: -2px;
+            background: rgba(229, 70, 31, 0.05);
+        }
+
+        .editable-table th input {
+            color: var(--ci-white);
+            font-weight: 600;
+        }
+
+        .editable-table th input::placeholder {
+            color: rgba(255, 255, 255, 0.5);
+        }
+
+        .preview-container {
+            background: var(--ci-black);
+            border-radius: 8px;
+            padding: 16px;
+            max-height: 250px;
+            overflow: auto;
+        }
+
+        .preview-content {
+            font-family: 'JetBrains Mono', monospace;
+            font-size: 13px;
+            line-height: 1.4;
+            color: #00ff00;
+            white-space: pre;
+        }
+
+        .footer {
+            display: flex;
+            justify-content: space-between;
+            gap: 12px;
+            padding: 16px 24px;
+            background: var(--ci-white);
+            border-top: 1px solid var(--ci-light-gray);
+        }
+
+        .footer-left {
+            display: flex;
+            gap: 8px;
+        }
+
+        .footer-right {
+            display: flex;
+            gap: 12px;
+        }
+
+        .btn {
+            padding: 10px 20px;
+            border-radius: 8px;
+            font-size: 0.875rem;
+            font-weight: 500;
+            cursor: pointer;
+            transition: all 0.2s;
+            border: none;
+        }
+
+        .btn-primary {
+            background: var(--ci-accent);
+            color: var(--ci-white);
+        }
+
+        .btn-primary:hover {
+            background: #c93a18;
+            transform: translateY(-1px);
+        }
+
+        .btn-secondary {
+            background: var(--ci-light-gray);
+            color: var(--ci-dark-gray);
+        }
+
+        .btn-secondary:hover {
+            background: #d0d0d0;
+        }
+
+        .btn-outline {
+            background: transparent;
+            border: 2px solid var(--ci-accent);
+            color: var(--ci-accent);
+        }
+
+        .btn-outline:hover {
+            background: var(--ci-accent);
+            color: var(--ci-white);
+        }
+
+        .btn-sm {
+            padding: 6px 12px;
+            font-size: 0.75rem;
+        }
+
+        .quick-templates {
+            display: flex;
+            gap: 8px;
+            flex-wrap: wrap;
+        }
+
+        .template-chip {
+            padding: 6px 12px;
+            background: var(--ci-light-gray);
+            border-radius: 20px;
+            font-size: 0.75rem;
+            cursor: pointer;
+            transition: all 0.2s;
+            border: none;
+        }
+
+        .template-chip:hover {
+            background: var(--ci-accent);
+            color: var(--ci-white);
+        }
+    </style>
+</head>
+<body>
+    <div class="header">
+        <h1>Table Generator</h1>
+    </div>
+
+    <div class="container">
+        <div class="section">
+            <div class="section-title">Table Settings</div>
+            <div class="controls-row">
+                <div class="control-group">
+                    <span class="control-label">Rows</span>
+                    <input type="number" id="rows" class="form-input" min="1" max="50" value="4" style="width: 80px;">
+                </div>
+                <div class="control-group">
+                    <span class="control-label">Columns</span>
+                    <input type="number" id="cols" class="form-input" min="1" max="20" value="4" style="width: 80px;">
+                </div>
+                <div class="control-group">
+                    <span class="control-label">Alignment</span>
+                    <select id="alignment" class="form-select">
+                        <option value="left">Left</option>
+                        <option value="center">Center</option>
+                        <option value="right">Right</option>
+                    </select>
+                </div>
+                <div class="control-group" style="justify-content: flex-end;">
+                    <label class="checkbox-label">
+                        <input type="checkbox" id="has-header" checked>
+                        Include Header Row
+                    </label>
+                </div>
+            </div>
+            <div class="quick-templates">
+                <button class="template-chip" data-rows="3" data-cols="2">2-Column (3 rows)</button>
+                <button class="template-chip" data-rows="5" data-cols="3">3-Column (5 rows)</button>
+                <button class="template-chip" data-rows="4" data-cols="4">4x4 Grid</button>
+                <button class="template-chip" data-rows="10" data-cols="3">Data Table (10 rows)</button>
+                <button class="template-chip" data-rows="2" data-cols="5">Wide Table</button>
+            </div>
+        </div>
+
+        <div class="section">
+            <div class="section-title">Edit Table Content</div>
+            <div class="table-container">
+                <table class="editable-table" id="editable-table">
+                    <!-- Generated dynamically -->
+                </table>
+            </div>
+        </div>
+
+        <div class="section">
+            <div class="section-title">Markdown Preview</div>
+            <div class="preview-container">
+                <div id="preview" class="preview-content"></div>
+            </div>
+        </div>
+    </div>
+
+    <div class="footer">
+        <div class="footer-left">
+            <button class="btn btn-secondary btn-sm" id="btn-clear">Clear All</button>
+            <button class="btn btn-outline btn-sm" id="btn-fill-sample">Fill Sample Data</button>
+        </div>
+        <div class="footer-right">
+            <button class="btn btn-secondary" id="btn-copy">Copy Markdown</button>
+            <button class="btn btn-primary" id="btn-insert">Insert to Editor</button>
+        </div>
+    </div>
+
+    <script>
+        let currentRows = 4;
+        let currentCols = 4;
+        let hasHeader = true;
+        let alignment = 'left';
+
+        // Generate the editable table
+        function generateEditableTable() {
+            const table = document.getElementById('editable-table');
+            hasHeader = document.getElementById('has-header').checked;
+            alignment = document.getElementById('alignment').value;
+
+            let html = '';
+
+            for (let i = 0; i < currentRows; i++) {
+                html += '<tr>';
+                for (let j = 0; j < currentCols; j++) {
+                    const isHeader = hasHeader && i === 0;
+                    const tag = isHeader ? 'th' : 'td';
+                    const placeholder = isHeader ? `Header ${j + 1}` : `Cell ${i},${j + 1}`;
+                    html += `<${tag}><input type="text" data-row="${i}" data-col="${j}" placeholder="${placeholder}"></${tag}>`;
+                }
+                html += '</tr>';
+            }
+
+            table.innerHTML = html;
+
+            // Add event listeners for live preview
+            table.querySelectorAll('input').forEach(input => {
+                input.addEventListener('input', updatePreview);
+            });
+
+            updatePreview();
+        }
+
+        // Get table data
+        function getTableData() {
+            const data = [];
+            for (let i = 0; i < currentRows; i++) {
+                const row = [];
+                for (let j = 0; j < currentCols; j++) {
+                    const input = document.querySelector(`input[data-row="${i}"][data-col="${j}"]`);
+                    row.push(input ? input.value || '' : '');
+                }
+                data.push(row);
+            }
+            return data;
+        }
+
+        // Generate markdown table
+        function generateMarkdown(data) {
+            if (data.length === 0 || data[0].length === 0) return '';
+
+            // Calculate column widths
+            const colWidths = [];
+            for (let j = 0; j < data[0].length; j++) {
+                let maxWidth = 3; // Minimum width for separator
+                for (let i = 0; i < data.length; i++) {
+                    maxWidth = Math.max(maxWidth, (data[i][j] || '').length);
+                }
+                colWidths.push(maxWidth);
+            }
+
+            // Generate alignment function
+            const alignCell = (text, width) => {
+                text = text || '';
+                const padding = width - text.length;
+                if (alignment === 'center') {
+                    const left = Math.floor(padding / 2);
+                    const right = padding - left;
+                    return ' '.repeat(left) + text + ' '.repeat(right);
+                } else if (alignment === 'right') {
+                    return ' '.repeat(padding) + text;
+                }
+                return text + ' '.repeat(padding);
+            };
+
+            // Generate separator based on alignment
+            const getSeparator = (width) => {
+                if (alignment === 'center') {
+                    return ':' + '-'.repeat(width - 2) + ':';
+                } else if (alignment === 'right') {
+                    return '-'.repeat(width - 1) + ':';
+                }
+                return '-'.repeat(width);
+            };
+
+            let markdown = '';
+            const startRow = hasHeader ? 0 : -1;
+
+            for (let i = startRow; i < data.length; i++) {
+                if (i === -1) {
+                    // Generate empty header for tables without header
+                    markdown += '| ' + colWidths.map(w => ' '.repeat(w)).join(' | ') + ' |\n';
+                } else {
+                    const row = data[i];
+                    const cells = row.map((cell, j) => alignCell(cell, colWidths[j]));
+                    markdown += '| ' + cells.join(' | ') + ' |\n';
+                }
+
+                // Add separator after first row
+                if ((hasHeader && i === 0) || (!hasHeader && i === -1)) {
+                    const separators = colWidths.map(w => getSeparator(w));
+                    markdown += '| ' + separators.join(' | ') + ' |\n';
+                }
+            }
+
+            return markdown;
+        }
+
+        // Update preview
+        function updatePreview() {
+            const data = getTableData();
+            const markdown = generateMarkdown(data);
+            document.getElementById('preview').textContent = markdown;
+        }
+
+        // Event listeners
+        document.getElementById('rows').addEventListener('change', (e) => {
+            currentRows = parseInt(e.target.value) || 4;
+            generateEditableTable();
+        });
+
+        document.getElementById('cols').addEventListener('change', (e) => {
+            currentCols = parseInt(e.target.value) || 4;
+            generateEditableTable();
+        });
+
+        document.getElementById('alignment').addEventListener('change', () => {
+            updatePreview();
+        });
+
+        document.getElementById('has-header').addEventListener('change', () => {
+            generateEditableTable();
+        });
+
+        // Quick templates
+        document.querySelectorAll('.template-chip').forEach(chip => {
+            chip.addEventListener('click', () => {
+                currentRows = parseInt(chip.dataset.rows);
+                currentCols = parseInt(chip.dataset.cols);
+                document.getElementById('rows').value = currentRows;
+                document.getElementById('cols').value = currentCols;
+                generateEditableTable();
+            });
+        });
+
+        // Clear all
+        document.getElementById('btn-clear').addEventListener('click', () => {
+            document.querySelectorAll('#editable-table input').forEach(input => {
+                input.value = '';
+            });
+            updatePreview();
+        });
+
+        // Fill sample data
+        document.getElementById('btn-fill-sample').addEventListener('click', () => {
+            const sampleHeaders = ['Name', 'Description', 'Status', 'Priority', 'Due Date'];
+            const sampleData = [
+                ['Task 1', 'First task description', 'In Progress', 'High', '2024-01-15'],
+                ['Task 2', 'Second task description', 'Completed', 'Medium', '2024-01-10'],
+                ['Task 3', 'Third task description', 'Pending', 'Low', '2024-01-20'],
+                ['Task 4', 'Fourth task description', 'In Review', 'High', '2024-01-18']
+            ];
+
+            for (let i = 0; i < currentRows; i++) {
+                for (let j = 0; j < currentCols; j++) {
+                    const input = document.querySelector(`input[data-row="${i}"][data-col="${j}"]`);
+                    if (input) {
+                        if (hasHeader && i === 0) {
+                            input.value = sampleHeaders[j % sampleHeaders.length];
+                        } else {
+                            const dataRow = hasHeader ? i - 1 : i;
+                            if (dataRow < sampleData.length && j < sampleData[dataRow].length) {
+                                input.value = sampleData[dataRow][j];
+                            } else {
+                                input.value = `Data ${i}-${j + 1}`;
+                            }
+                        }
+                    }
+                }
+            }
+            updatePreview();
+        });
+
+        // Copy markdown
+        document.getElementById('btn-copy').addEventListener('click', () => {
+            const markdown = document.getElementById('preview').textContent;
+            navigator.clipboard.writeText(markdown).then(() => {
+                const btn = document.getElementById('btn-copy');
+                btn.textContent = 'Copied!';
+                setTimeout(() => {
+                    btn.textContent = 'Copy Markdown';
+                }, 2000);
+            });
+        });
+
+        // Insert to editor
+        document.getElementById('btn-insert').addEventListener('click', () => {
+            const content = document.getElementById('preview').textContent;
+            if (content && window.electronAPI) {
+                window.electronAPI.send('insert-generated-content', '\n' + content + '\n');
+                window.close();
+            }
+        });
+
+        // Initialize
+        generateEditableTable();
+    </script>
+</body>
+</html>

src/templates/api-docs.md

@@ -0,0 +1,90 @@
+# API Documentation
+
+**Base URL:** `https://api.example.com/v1`
+**Version:** 1.0
+**Date:** {{DATE}}
+
+## Authentication
+
+All requests require an API key in the header:
+
+```
+Authorization: Bearer YOUR_API_KEY
+```
+
+## Endpoints
+
+### Get All Resources
+
+```
+GET /resources
+```
+
+**Query Parameters:**
+
+| Parameter | Type | Required | Description |
+|-----------|------|----------|-------------|
+| page | integer | No | Page number (default: 1) |
+| limit | integer | No | Items per page (default: 20) |
+
+**Response:**
+
+```json
+{
+  "data": [],
+  "total": 0,
+  "page": 1
+}
+```
+
+### Get Resource by ID
+
+```
+GET /resources/:id
+```
+
+**Response:**
+
+```json
+{
+  "id": "1",
+  "name": "Resource name",
+  "created_at": "2024-01-01T00:00:00Z"
+}
+```
+
+### Create Resource
+
+```
+POST /resources
+```
+
+**Request Body:**
+
+```json
+{
+  "name": "New resource",
+  "description": "Description"
+}
+```
+
+### Update Resource
+
+```
+PUT /resources/:id
+```
+
+### Delete Resource
+
+```
+DELETE /resources/:id
+```
+
+## Error Codes
+
+| Code | Description |
+|------|-------------|
+| 400 | Bad Request |
+| 401 | Unauthorized |
+| 404 | Not Found |
+| 500 | Internal Server Error |

src/templates/blog-post.md

@@ -0,0 +1,20 @@
+---
+title: Blog Post Title
+date: {{DATE}}
+author: Your Name
+tags: []
+---
+
+# Blog Post Title
+
+## Introduction
+
+Write your introduction here.
+
+## Main Content
+
+Your main content goes here.
+
+## Conclusion
+
+Wrap up your thoughts.

src/templates/changelog.md

@@ -0,0 +1,20 @@
+# Changelog
+
+## [Unreleased]
+
+### Added
+- New feature
+
+### Changed
+- Updated feature
+
+### Fixed
+- Bug fix
+
+### Removed
+- Removed feature
+
+## [1.0.0] - {{DATE}}
+
+### Added
+- Initial release

src/templates/comparison.md

@@ -0,0 +1,59 @@
+# Comparison: [Option A] vs [Option B]
+
+**Date:** {{DATE}}
+**Author:** Your Name
+
+## Overview
+
+Brief description of what is being compared and why.
+
+## Feature Comparison
+
+| Feature | Option A | Option B |
+|---------|----------|----------|
+| Feature 1 | Yes | Yes |
+| Feature 2 | Yes | No |
+| Feature 3 | No | Yes |
+| Feature 4 | Partial | Yes |
+
+## Pricing
+
+| Plan | Option A | Option B |
+|------|----------|----------|
+| Free | Limited | Limited |
+| Pro | $10/mo | $15/mo |
+| Enterprise | Custom | Custom |
+
+## Pros and Cons
+
+### Option A
+
+**Pros:**
+- Pro 1
+- Pro 2
+
+**Cons:**
+- Con 1
+- Con 2
+
+### Option B
+
+**Pros:**
+- Pro 1
+- Pro 2
+
+**Cons:**
+- Con 1
+- Con 2
+
+## Performance
+
+| Metric | Option A | Option B |
+|--------|----------|----------|
+| Speed | Fast | Moderate |
+| Memory | Low | Medium |
+| Scalability | Good | Excellent |
+
+## Recommendation
+
+Based on the analysis above, [Option A/B] is recommended for [use case] because [reason].

src/templates/meeting-notes.md

@@ -0,0 +1,26 @@
+# Meeting Notes
+
+**Date:** {{DATE}}
+**Attendees:**
+- Name 1
+- Name 2
+
+## Agenda
+
+1. Topic 1
+2. Topic 2
+
+## Discussion
+
+### Topic 1
+
+Notes here.
+
+## Action Items
+
+- [ ] Action item 1 — Owner — Due date
+- [ ] Action item 2 — Owner — Due date
+
+## Next Meeting
+
+Date: TBD

src/templates/project-plan.md

@@ -0,0 +1,54 @@
+# Project Plan: [Project Name]
+
+**Date:** {{DATE}}
+**Project Lead:** Your Name
+**Status:** Planning
+
+## Goals
+
+1. Primary goal
+2. Secondary goal
+
+## Scope
+
+### In Scope
+- Item 1
+- Item 2
+
+### Out of Scope
+- Item 1
+
+## Milestones
+
+| Milestone | Target Date | Status |
+|-----------|-------------|--------|
+| Kickoff | {{DATE}} | Not Started |
+| MVP | TBD | Not Started |
+| Launch | TBD | Not Started |
+
+## Resources
+
+| Role | Person | Allocation |
+|------|--------|------------|
+| Lead | Name | 100% |
+| Developer | Name | 50% |
+
+## Risks
+
+| Risk | Impact | Likelihood | Mitigation |
+|------|--------|------------|------------|
+| Risk 1 | High | Medium | Plan |
+
+## Timeline
+
+### Phase 1: Planning
+- [ ] Define requirements
+- [ ] Create design documents
+
+### Phase 2: Development
+- [ ] Implement core features
+- [ ] Write tests
+
+### Phase 3: Launch
+- [ ] Deploy to production
+- [ ] Monitor and iterate

src/templates/readme.md

@@ -0,0 +1,38 @@
+# Project Name
+
+Brief description of the project.
+
+## Features
+
+- Feature 1
+- Feature 2
+
+## Installation
+
+```bash
+npm install project-name
+```
+
+## Usage
+
+```javascript
+const project = require('project-name');
+```
+
+## Configuration
+
+| Option | Default | Description |
+|--------|---------|-------------|
+| option1 | true | Description |
+
+## Contributing
+
+1. Fork the repository
+2. Create your feature branch
+3. Commit your changes
+4. Push to the branch
+5. Open a Pull Request
+
+## License
+
+MIT

src/templates/release-notes.md

@@ -0,0 +1,42 @@
+# Release Notes - v1.0.0
+
+**Release Date:** {{DATE}}
+
+## Highlights
+
+Brief summary of the most important changes in this release.
+
+## New Features
+
+- **Feature 1:** Description of the new feature
+- **Feature 2:** Description of the new feature
+
+## Improvements
+
+- Improved performance of feature X
+- Updated dependency Y to version Z
+
+## Bug Fixes
+
+- Fixed issue where X would cause Y (#123)
+- Resolved crash when performing Z (#456)
+
+## Breaking Changes
+
+- Changed API endpoint from `/old` to `/new`
+- Removed deprecated method `oldMethod()`
+
+## Migration Guide
+
+### From v0.9.x to v1.0.0
+
+1. Update configuration file format
+2. Replace deprecated API calls
+
+## Known Issues
+
+- Issue description (#789)
+
+## Contributors
+
+Thanks to everyone who contributed to this release.

src/templates/technical-spec.md

@@ -0,0 +1,42 @@
+# Technical Specification: [Feature Name]
+
+**Version:** 1.0
+**Date:** {{DATE}}
+**Author:** Your Name
+**Status:** Draft
+
+## Overview
+
+Brief description of what this feature does.
+
+## Requirements
+
+### Functional Requirements
+1. Requirement 1
+2. Requirement 2
+
+### Non-Functional Requirements
+1. Performance requirement
+2. Security requirement
+
+## Architecture
+
+Describe the technical approach.
+
+## API Design
+
+### Endpoints
+
+| Method | Path | Description |
+|--------|------|-------------|
+| GET | /api/resource | Get resource |
+
+## Testing Strategy
+
+Describe how this will be tested.
+
+## Timeline
+
+| Phase | Duration | Deliverables |
+|-------|----------|-------------|
+| Phase 1 | 1 week | Core implementation |

src/templates/tutorial.md

@@ -0,0 +1,71 @@
+# Tutorial: [Topic Name]
+
+**Date:** {{DATE}}
+**Difficulty:** Beginner / Intermediate / Advanced
+**Time:** ~30 minutes
+
+## Prerequisites
+
+- Prerequisite 1
+- Prerequisite 2
+
+## What You Will Learn
+
+- Learning objective 1
+- Learning objective 2
+
+## Step 1: Getting Started
+
+Description of the first step.
+
+```bash
+# Example command
+echo "Hello, World!"
+```
+
+## Step 2: Core Concepts
+
+Explain the main concepts here.
+
+### Key Concept A
+
+Details about concept A.
+
+### Key Concept B
+
+Details about concept B.
+
+## Step 3: Building the Feature
+
+Walk through the implementation.
+
+```javascript
+// Example code
+function example() {
+    return 'Hello';
+}
+```
+
+## Step 4: Testing
+
+How to verify everything works.
+
+## Common Issues
+
+### Issue 1
+**Problem:** Description of the problem.
+**Solution:** How to fix it.
+
+### Issue 2
+**Problem:** Description of the problem.
+**Solution:** How to fix it.
+
+## Next Steps
+
+- Suggested follow-up 1
+- Suggested follow-up 2
+
+## Resources
+
+- [Resource 1](https://example.com)
+- [Resource 2](https://example.com)

src/welcome.js

@@ -0,0 +1,78 @@
+function createWelcomeContent(recentFiles = []) {
+    const recentHtml = recentFiles.length
+        ? recentFiles.map(f => {
+            const name = f.split(/[/\\]/).pop();
+            return `<div class="welcome-recent-item" data-path="${f}"><span class="welcome-recent-name">${name}</span><span class="welcome-recent-path">${f}</span></div>`;
+        }).join('')
+        : '<p class="welcome-muted">No recent files</p>';
+
+    return `
+    <div class="welcome-container">
+        <div class="welcome-hero">
+            <h1 class="welcome-title">MarkdownConverter</h1>
+            <p class="welcome-version">Version 4.0.0</p>
+            <p class="welcome-subtitle">Professional Markdown Editor & Universal Document Converter</p>
+        </div>
+
+        <div class="welcome-grid">
+            <div class="welcome-section">
+                <h2>Quick Start</h2>
+                <div class="welcome-cards">
+                    <div class="welcome-card" data-action="new-file">
+                        <div class="welcome-card-icon">+</div>
+                        <h3>New Document</h3>
+                        <p>Create a blank document</p>
+                        <kbd>Ctrl+N</kbd>
+                    </div>
+                    <div class="welcome-card" data-action="open-file">
+                        <div class="welcome-card-icon">&#128194;</div>
+                        <h3>Open File</h3>
+                        <p>Open an existing file</p>
+                        <kbd>Ctrl+O</kbd>
+                    </div>
+                    <div class="welcome-card" data-action="open-template">
+                        <div class="welcome-card-icon">&#128203;</div>
+                        <h3>From Template</h3>
+                        <p>Start from a template</p>
+                    </div>
+                    <div class="welcome-card" data-action="command-palette">
+                        <div class="welcome-card-icon">&#8984;</div>
+                        <h3>Command Palette</h3>
+                        <p>Search all actions</p>
+                        <kbd>Ctrl+Shift+P</kbd>
+                    </div>
+                </div>
+            </div>
+
+            <div class="welcome-section">
+                <h2>What's New in v4.0.0</h2>
+                <ul class="welcome-features">
+                    <li><strong>CodeMirror Editor</strong> — Syntax highlighting, code folding, multiple cursors</li>
+                    <li><strong>Sidebar Panels</strong> — File Explorer, Git, Snippets, Templates</li>
+                    <li><strong>Command Palette</strong> — Quick access to all actions</li>
+                    <li><strong>Code Execution</strong> — Run JS, Python, Bash from code blocks</li>
+                    <li><strong>Print Preview</strong> — Full print customization dialog</li>
+                    <li><strong>New Formats</strong> — Reveal.js, YAML, JSON, Confluence, and more</li>
+                    <li><strong>Spell Checking</strong> — System dictionary with suggestions</li>
+                    <li><strong>Markdown Extensions</strong> — Footnotes, admonitions, TOC</li>
+                    <li><strong>Image Handling</strong> — Paste and drag-drop images</li>
+                    <li><strong>PlantUML</strong> — Diagram rendering in preview</li>
+                </ul>
+            </div>
+
+            <div class="welcome-section">
+                <h2>Recent Files</h2>
+                <div class="welcome-recent">${recentHtml}</div>
+            </div>
+        </div>
+
+        <div class="welcome-footer">
+            <label class="welcome-checkbox">
+                <input type="checkbox" id="show-welcome-startup" checked>
+                Show this tab on startup
+            </label>
+        </div>
+    </div>`;
+}
+
+module.exports = { createWelcomeContent };

src/wordTemplateExporter.js

@@ -10,9 +10,10 @@ const PizZip = require('pizzip');
 const Docx = require('docx4js').default;
 
 class WordTemplateExporter {
-    constructor(templatePath, startPage = 3) {
+    constructor(templatePath, startPage = 3, pageSettings = null) {
         this.templatePath = templatePath || path.join(__dirname, '../word_template.docx');
         this.startPage = startPage; // Which page to start inserting content
+        this.pageSettings = pageSettings; // Page size and orientation settings
     }
 
     /**
@@ -25,7 +26,12 @@ class WordTemplateExporter {
             const zip = new PizZip(templateBuffer);
 
             // Extract document.xml
-            const documentXml = zip.file('word/document.xml').asText();
+            let documentXml = zip.file('word/document.xml').asText();
+
+            // Set page size if settings provided
+            if (this.pageSettings) {
+                documentXml = this.setPageSize(documentXml);
+            }
 
             // Parse markdown and generate Word XML
             const newContentXml = this.markdownToWordXml(markdownContent);
@@ -47,6 +53,56 @@ class WordTemplateExporter {
         }
     }
 
+    /**
+     * Set page size in document XML
+     */
+    setPageSize(documentXml) {
+        // Import PAGE_SIZES from main process (need to pass as parameter)
+        const PAGE_SIZES = {
+            a4: { width: 11906, height: 16838 },
+            a3: { width: 16838, height: 23811 },
+            a5: { width: 8391, height: 11906 },
+            b4: { width: 14170, height: 20015 },
+            b5: { width: 9979, height: 14170 },
+            letter: { width: 12240, height: 15840 },
+            legal: { width: 12240, height: 20160 },
+            tabloid: { width: 15840, height: 24480 }
+        };
+
+        let width, height;
+        const pageSize = PAGE_SIZES[this.pageSettings.size];
+
+        if (pageSize) {
+            width = pageSize.width;
+            height = pageSize.height;
+        } else {
+            // Default to A4
+            width = 11906;
+            height = 16838;
+        }
+
+        // Swap dimensions for landscape
+        if (this.pageSettings.orientation === 'landscape') {
+            [width, height] = [height, width];
+        }
+
+        // Update all <w:pgSz> elements in section properties
+        const pgSzRegex = /<w:pgSz[^>]*\/>/g;
+        let modifiedXml = documentXml.replace(pgSzRegex, () => {
+            return `<w:pgSz w:w="${width}" w:h="${height}" w:orient="${this.pageSettings.orientation}"/>`;
+        });
+
+        // If no pgSz found, add it to all sectPr elements
+        if (!pgSzRegex.test(documentXml)) {
+            const sectPrRegex = /<w:sectPr[^>]*>/g;
+            modifiedXml = modifiedXml.replace(sectPrRegex, (match) => {
+                return `${match}<w:pgSz w:w="${width}" w:h="${height}" w:orient="${this.pageSettings.orientation}"/>`;
+            });
+        }
+
+        return modifiedXml;
+    }
+
     /**
      * Insert markdown content after the specified page in the document
      * @param {string} documentXml - The document XML
@@ -253,23 +309,42 @@ class WordTemplateExporter {
     }
 
     /**
-     * Create code block XML
+     * Create code block XML - renders each line as separate paragraph
+     * to preserve exact formatting like in preview (monospace, no wrapping)
+     * Background shading applied at paragraph level to extend full width
      */
     createCodeBlockXml(code) {
-        const escapedCode = this.escapeXml(code);
+        const lines = code.split('\n');
+        let xml = '';
 
-        return `<w:p>
-            <w:pPr>
-                <w:pStyle w:val="Code"/>
-            </w:pPr>
-            <w:r>
-                <w:rPr>
-                    <w:rFonts w:ascii="Consolas" w:hAnsi="Consolas"/>
-                    <w:sz w:val="18"/>
-                </w:rPr>
-                <w:t xml:space="preserve">${escapedCode}</w:t>
-            </w:r>
-        </w:p>`;
+        lines.forEach((line, index) => {
+            const escapedLine = this.escapeXml(line);
+
+            // Each line gets its own paragraph with exact spacing and no wrapping
+            // Shading (shd) is at paragraph level so background extends full width
+            xml += `<w:p>
+                <w:pPr>
+                    <w:pStyle w:val="Normal"/>
+                    <w:shd w:val="clear" w:color="auto" w:fill="F5F5F5"/>
+                    <w:spacing w:before="${index === 0 ? '120' : '0'}" w:after="${index === lines.length - 1 ? '120' : '0'}" w:line="240" w:lineRule="exact"/>
+                    <w:ind w:left="284" w:right="284"/>
+                    <w:jc w:val="left"/>
+                    <w:keepLines/>
+                    <w:wordWrap w:val="0"/>
+                </w:pPr>
+                <w:r>
+                    <w:rPr>
+                        <w:rFonts w:ascii="Consolas" w:hAnsi="Consolas" w:cs="Consolas"/>
+                        <w:sz w:val="18"/>
+                        <w:szCs w:val="18"/>
+                        <w:noProof/>
+                    </w:rPr>
+                    <w:t xml:space="preserve">${escapedLine}</w:t>
+                </w:r>
+            </w:p>`;
+        });
+
+        return xml;
     }
 
     /**
@@ -287,6 +362,7 @@ class WordTemplateExporter {
 
     /**
      * Create table XML from markdown table lines with template styling
+     * Uses full-width tables with equal column distribution matching template style
      */
     createTableXml(tableLines) {
         // Parse table
@@ -308,13 +384,19 @@ class WordTemplateExporter {
         // Calculate number of columns
         const numCols = Math.max(...rows.map(row => row.length));
 
+        // Calculate column width in twips (1440 twips = 1 inch)
+        // Assume standard page width of 9360 twips (6.5 inches usable)
+        const totalTableWidth = 9360;
+        const colWidth = Math.floor(totalTableWidth / numCols);
+
         // Build table XML
         let tableXml = '<w:tbl>';
 
-        // Table properties - use template table style
+        // Table properties - use template table style with full width
         tableXml += `<w:tblPr>
             <w:tblStyle w:val="TableGrid"/>
-            <w:tblW w:w="5000" w:type="pct"/>
+            <w:tblW w:w="0" w:type="auto"/>
+            <w:tblLayout w:type="fixed"/>
             <w:tblLook w:val="04A0" w:firstRow="1" w:lastRow="0" w:firstColumn="0" w:lastColumn="0" w:noHBand="0" w:noVBand="1"/>
             <w:tblBorders>
                 <w:top w:val="single" w:sz="8" w:space="0" w:color="F58220"/>
@@ -326,20 +408,22 @@ class WordTemplateExporter {
             </w:tblBorders>
         </w:tblPr>`;
 
-        // Table grid
+        // Table grid with explicit column widths
         tableXml += '<w:tblGrid>';
         for (let i = 0; i < numCols; i++) {
-            tableXml += '<w:gridCol/>';
+            tableXml += `<w:gridCol w:w="${colWidth}"/>`;
         }
         tableXml += '</w:tblGrid>';
 
         // Table rows
         rows.forEach((rowCells, rowIndex) => {
             const isHeader = rowIndex === 0;
-            const isEvenRow = rowIndex % 2 === 0;
 
             tableXml += '<w:tr>';
 
+            // Row properties for consistent height
+            tableXml += '<w:trPr><w:trHeight w:val="0" w:hRule="atLeast"/></w:trPr>';
+
             // Pad row to have same number of columns
             while (rowCells.length < numCols) {
                 rowCells.push('');
@@ -349,9 +433,14 @@ class WordTemplateExporter {
                 tableXml += '<w:tc>';
                 tableXml += '<w:tcPr>';
 
+                // Cell width
+                tableXml += `<w:tcW w:w="${colWidth}" w:type="dxa"/>`;
+
                 // Cell shading - orange for header, white for data rows
                 if (isHeader) {
-                    tableXml += '<w:shd w:val="clear" w:color="FFFFFF" w:fill="F58220"/>';
+                    tableXml += '<w:shd w:val="clear" w:color="auto" w:fill="F58220"/>';
+                } else {
+                    tableXml += '<w:shd w:val="clear" w:color="auto" w:fill="FFFFFF"/>';
                 }
 
                 // Cell borders
@@ -361,12 +450,21 @@ class WordTemplateExporter {
                     '<w:bottom w:val="single" w:sz="8" w:space="0" w:color="F58220"/>' +
                     '<w:right w:val="single" w:sz="8" w:space="0" w:color="F58220"/>' +
                     '</w:tcBorders>';
+
+                // Cell margins for proper padding
+                tableXml += '<w:tcMar>' +
+                    '<w:top w:w="80" w:type="dxa"/>' +
+                    '<w:left w:w="120" w:type="dxa"/>' +
+                    '<w:bottom w:w="80" w:type="dxa"/>' +
+                    '<w:right w:w="120" w:type="dxa"/>' +
+                    '</w:tcMar>';
+
                 tableXml += '</w:tcPr>';
 
                 // Cell content
                 tableXml += '<w:p>';
                 tableXml += '<w:pPr>';
-                tableXml += '<w:spacing w:before="100" w:after="100"/>';
+                tableXml += '<w:spacing w:before="0" w:after="0" w:line="240" w:lineRule="auto"/>';
                 tableXml += '</w:pPr>';
 
                 const runs = this.parseInlineFormatting(cellText);
@@ -388,6 +486,9 @@ class WordTemplateExporter {
 
         tableXml += '</w:tbl>';
 
+        // Add spacing after table
+        tableXml += '<w:p><w:pPr><w:spacing w:before="120" w:after="0"/></w:pPr></w:p>';
+
         return tableXml;
     }
 
@@ -397,15 +498,22 @@ class WordTemplateExporter {
     isAsciiArt(line) {
         // Don't treat markdown tables as ASCII art
         if (line.trim().startsWith('|') && line.trim().endsWith('|')) {
-            return false;
+            // Check if it's a proper markdown table (has multiple cells)
+            const cells = line.split('|').filter(c => c.trim());
+            if (cells.length >= 2) {
+                return false;
+            }
         }
 
-        // Common ASCII art characters
+        // Common ASCII art characters (Unicode box drawing and symbols)
         const asciiArtChars = [
             '─', '│', '┌', '┐', '└', '┘', '├', '┤', '┬', '┴', '┼',  // Box drawing
             '═', '║', '╔', '╗', '╚', '╝', '╠', '╣', '╦', '╩', '╬',  // Double box
-            '▲', '▼', '◄', '►', '♦', '●', '○', '■', '□',             // Shapes
-            '↓', '→', '←', '↑',                                      // Arrows
+            '╭', '╮', '╯', '╰',                                      // Rounded corners
+            '▲', '▼', '◄', '►', '♦', '●', '○', '■', '□', '◆', '◇',  // Shapes
+            '↓', '→', '←', '↑', '↔', '↕', '⇒', '⇐', '⇓', '⇑',      // Arrows
+            '┃', '━', '┏', '┓', '┗', '┛', '┣', '┫', '┳', '┻', '╋',  // Heavy box
+            '░', '▒', '▓', '█',                                      // Shading
         ];
 
         // Check for box drawing characters
@@ -415,14 +523,18 @@ class WordTemplateExporter {
 
         // Check for ASCII box patterns with regular characters
         const asciiPatterns = [
-            /^\s*\+[-=_]+\+/,                    // +-----+
+            /^\s*\+[-=_+]+\+/,                   // +-----+ or +=====+
             /^\s*\|[-=_]{3,}\|/,                 // |-----|
             /^\s*[-=_]{5,}$/,                    // -----
+            /^\s*\+[-]+\+[-]+\+/,                // +---+---+
             /^\s*\([A-Z][a-z]+\)\s*\|\|/,       // (Deformable) ||
             /^\s*\|\s+[A-Z\s]+[-:]\s+[A-Z]/,    // | TILE ADHESIVE - TYPE
             /^\s*\|\s*\[[^\]]+\]/,              // | [BIS Mark / CE Mark]
             /^\s*\|\s{2,}\w+.*\|\|/,            // ||  text  ||
-            /^\s*\[[^\]]+\]/,                   // [Step in brackets]
+            /^\s*\[[^\]]+\]\s*$/,               // [Step in brackets]
+            /^\s*<[-=]+>/,                       // <----> or <====>
+            /^\s*\/[-_\\\/]+\//,                 // /----/
+            /^\s*\*[-=\*]+\*/,                   // *----*
         ];
 
         return asciiPatterns.some(pattern => pattern.test(line));
@@ -430,6 +542,7 @@ class WordTemplateExporter {
 
     /**
      * Create ASCII art XML with monospace font
+     * Background shading applied at paragraph level to extend full width
      */
     createAsciiArtXml(asciiContent) {
         // Split ASCII art into individual lines and create a paragraph for each
@@ -437,10 +550,13 @@ class WordTemplateExporter {
         let xml = '';
 
         lines.forEach((line, index) => {
+            // Shading (shd) is at paragraph level so background extends full width
             xml += `<w:p>
                 <w:pPr>
+                    <w:pStyle w:val="Normal"/>
+                    <w:shd w:val="clear" w:color="auto" w:fill="F5F5F5"/>
                     <w:spacing w:before="${index === 0 ? '120' : '0'}" w:after="${index === lines.length - 1 ? '120' : '0'}" w:line="240" w:lineRule="exact"/>
-                    <w:ind w:left="0" w:right="0"/>
+                    <w:ind w:left="284" w:right="284"/>
                     <w:jc w:val="left"/>
                     <w:keepLines/>
                     <w:wordWrap w:val="0"/>
@@ -453,7 +569,6 @@ class WordTemplateExporter {
             if (hasArrow) {
                 // Split line into parts and color arrows red
                 let remainingLine = line;
-                let processedText = '';
 
                 while (remainingLine.length > 0) {
                     let foundArrow = false;
@@ -479,7 +594,6 @@ class WordTemplateExporter {
                                     <w:rFonts w:ascii="Consolas" w:hAnsi="Consolas" w:cs="Consolas"/>
                                     <w:sz w:val="16"/>
                                     <w:szCs w:val="16"/>
-                                    <w:shd w:val="clear" w:color="auto" w:fill="F5F5F5"/>
                                     <w:noProof/>
                                 </w:rPr>
                                 <w:t xml:space="preserve">${beforeArrow}</w:t>
@@ -494,7 +608,6 @@ class WordTemplateExporter {
                                 <w:sz w:val="16"/>
                                 <w:szCs w:val="16"/>
                                 <w:color w:val="FF0000"/>
-                                <w:shd w:val="clear" w:color="auto" w:fill="F5F5F5"/>
                                 <w:noProof/>
                             </w:rPr>
                             <w:t xml:space="preserve">${escapedArrow}</w:t>
@@ -510,7 +623,6 @@ class WordTemplateExporter {
                                 <w:rFonts w:ascii="Consolas" w:hAnsi="Consolas" w:cs="Consolas"/>
                                 <w:sz w:val="16"/>
                                 <w:szCs w:val="16"/>
-                                <w:shd w:val="clear" w:color="auto" w:fill="F5F5F5"/>
                                 <w:noProof/>
                             </w:rPr>
                             <w:t xml:space="preserve">${escapedRemaining}</w:t>
@@ -526,7 +638,6 @@ class WordTemplateExporter {
                         <w:rFonts w:ascii="Consolas" w:hAnsi="Consolas" w:cs="Consolas"/>
                         <w:sz w:val="16"/>
                         <w:szCs w:val="16"/>
-                        <w:shd w:val="clear" w:color="auto" w:fill="F5F5F5"/>
                         <w:noProof/>
                     </w:rPr>
                     <w:t xml:space="preserve">${escapedLine}</w:t>

tests/command-palette.test.js

@@ -0,0 +1,144 @@
+/**
+ * @jest-environment jsdom
+ */
+
+/**
+ * Tests for CommandPalette
+ * Tests command registration, filtering, execution, and keyboard navigation
+ */
+
+describe('CommandPalette', () => {
+    let CommandPalette;
+
+    beforeEach(() => {
+        document.body.innerHTML = `
+            <div class="command-palette-overlay hidden" id="command-palette-overlay">
+                <div class="command-palette">
+                    <input type="text" id="command-palette-input">
+                    <div id="command-palette-results"></div>
+                </div>
+            </div>
+        `;
+        CommandPalette = require('../src/command-palette').CommandPalette;
+    });
+
+    test('starts hidden', () => {
+        const palette = new CommandPalette();
+        expect(palette.isOpen()).toBe(false);
+    });
+
+    test('opens and focuses input', () => {
+        const palette = new CommandPalette();
+        palette.open();
+        expect(palette.isOpen()).toBe(true);
+    });
+
+    test('closes', () => {
+        const palette = new CommandPalette();
+        palette.open();
+        palette.close();
+        expect(palette.isOpen()).toBe(false);
+    });
+
+    test('registers and renders commands', () => {
+        const palette = new CommandPalette();
+        palette.register('Test Command', 'Ctrl+T', () => {});
+        palette.register('Another Command', '', () => {});
+        palette.open();
+        const items = document.querySelectorAll('.command-item');
+        expect(items.length).toBe(2);
+    });
+
+    test('filters commands by search', () => {
+        const palette = new CommandPalette();
+        palette.register('Save File', 'Ctrl+S', () => {});
+        palette.register('Open File', 'Ctrl+O', () => {});
+        palette.register('Bold Text', 'Ctrl+B', () => {});
+        palette.renderResults('file');
+        const items = document.querySelectorAll('.command-item');
+        expect(items.length).toBe(2);
+    });
+
+    test('executes command', () => {
+        const palette = new CommandPalette();
+        const action = jest.fn();
+        palette.register('Test', '', action);
+        palette.open();
+        palette.executeSelected();
+        expect(action).toHaveBeenCalled();
+    });
+
+    test('highlights matching text', () => {
+        const palette = new CommandPalette();
+        const result = palette.highlightMatch('Save File', 'save');
+        expect(result).toContain('<strong>');
+        expect(result).toContain('Save');
+    });
+
+    test('highlightMatch returns original text when no query', () => {
+        const palette = new CommandPalette();
+        const result = palette.highlightMatch('Save File', '');
+        expect(result).toBe('Save File');
+    });
+
+    test('filters case-insensitively', () => {
+        const palette = new CommandPalette();
+        palette.register('Save File', '', () => {});
+        palette.register('Open File', '', () => {});
+        palette.renderResults('SAVE');
+        const items = document.querySelectorAll('.command-item');
+        expect(items.length).toBe(1);
+    });
+
+    test('shows all commands when query is empty', () => {
+        const palette = new CommandPalette();
+        palette.register('Cmd1', '', () => {});
+        palette.register('Cmd2', '', () => {});
+        palette.register('Cmd3', '', () => {});
+        palette.renderResults('');
+        const items = document.querySelectorAll('.command-item');
+        expect(items.length).toBe(3);
+    });
+
+    test('displays shortcut when provided', () => {
+        const palette = new CommandPalette();
+        palette.register('Save File', 'Ctrl+S', () => {});
+        palette.open();
+        const shortcut = document.querySelector('.command-shortcut');
+        expect(shortcut).not.toBeNull();
+        expect(shortcut.textContent).toBe('Ctrl+S');
+    });
+
+    test('does not display shortcut when empty', () => {
+        const palette = new CommandPalette();
+        palette.register('Test Command', '', () => {});
+        palette.open();
+        const shortcut = document.querySelector('.command-shortcut');
+        expect(shortcut).toBeNull();
+    });
+
+    test('closes on overlay click', () => {
+        const palette = new CommandPalette();
+        palette.open();
+        // Simulate click on the overlay itself
+        const event = new Event('click', { bubbles: true });
+        Object.defineProperty(event, 'target', { value: palette.overlay });
+        palette.overlay.dispatchEvent(event);
+        expect(palette.isOpen()).toBe(false);
+    });
+
+    test('executeSelected does nothing when no commands', () => {
+        const palette = new CommandPalette();
+        palette.open();
+        // Should not throw
+        expect(() => palette.executeSelected()).not.toThrow();
+    });
+
+    test('closes after executing command', () => {
+        const palette = new CommandPalette();
+        palette.register('Test', '', jest.fn());
+        palette.open();
+        palette.executeSelected();
+        expect(palette.isOpen()).toBe(false);
+    });
+});

tests/main-utils.test.js

@@ -0,0 +1,100 @@
+/**
+ * Tests for Main Process Utilities
+ * Tests sanitization, rate limiting, and other main process helpers
+ */
+
+describe('sanitizeErrorMessage', () => {
+    const sanitizeErrorMessage = (message) => {
+        if (typeof message !== 'string') return String(message);
+        return message
+            .replace(/[A-Z]:\\[^\s"']+\\([^\s"'\\]+)/gi, '$1')
+            .replace(/\/[^\s"']+\/([^\s"'/]+)/g, '$1');
+    };
+
+    test('strips Windows absolute paths', () => {
+        expect(sanitizeErrorMessage('Error in C:\\Users\\test\\file.js'))
+            .toBe('Error in file.js');
+    });
+
+    test('strips Unix absolute paths', () => {
+        expect(sanitizeErrorMessage('Error in /home/user/project/file.js'))
+            .toBe('Error in file.js');
+    });
+
+    test('handles non-string input', () => {
+        expect(sanitizeErrorMessage(42)).toBe('42');
+        expect(sanitizeErrorMessage(null)).toBe('null');
+    });
+
+    test('preserves messages without paths', () => {
+        expect(sanitizeErrorMessage('Something went wrong'))
+            .toBe('Something went wrong');
+    });
+
+    test('strips nested Windows paths', () => {
+        expect(sanitizeErrorMessage('Cannot read C:\\Users\\admin\\AppData\\Local\\config.json'))
+            .toBe('Cannot read config.json');
+    });
+
+    test('strips nested Unix paths', () => {
+        expect(sanitizeErrorMessage('File not found: /var/log/app/error.log'))
+            .toBe('File not found: error.log');
+    });
+
+    test('handles undefined input', () => {
+        expect(sanitizeErrorMessage(undefined)).toBe('undefined');
+    });
+});
+
+describe('createRateLimiter', () => {
+    const createRateLimiter = (minIntervalMs = 2000) => {
+        let lastCall = 0;
+        return function canProceed() {
+            const now = Date.now();
+            if (now - lastCall < minIntervalMs) return false;
+            lastCall = now;
+            return true;
+        };
+    };
+
+    test('allows first call', () => {
+        const limiter = createRateLimiter(1000);
+        expect(limiter()).toBe(true);
+    });
+
+    test('blocks rapid calls', () => {
+        const limiter = createRateLimiter(1000);
+        limiter(); // first call
+        expect(limiter()).toBe(false); // too soon
+    });
+
+    test('allows call after interval', () => {
+        jest.useFakeTimers();
+        const limiter = createRateLimiter(1000);
+        limiter();
+        jest.advanceTimersByTime(1001);
+        expect(limiter()).toBe(true);
+        jest.useRealTimers();
+    });
+
+    test('uses default interval of 2000ms', () => {
+        jest.useFakeTimers();
+        const limiter = createRateLimiter();
+        limiter();
+        jest.advanceTimersByTime(1999);
+        expect(limiter()).toBe(false);
+        jest.advanceTimersByTime(2);
+        expect(limiter()).toBe(true);
+        jest.useRealTimers();
+    });
+
+    test('resets after successful call', () => {
+        jest.useFakeTimers();
+        const limiter = createRateLimiter(500);
+        limiter();
+        jest.advanceTimersByTime(501);
+        limiter(); // resets the timer
+        expect(limiter()).toBe(false); // too soon after second call
+        jest.useRealTimers();
+    });
+});

tests/markdown-extensions.test.js

@@ -0,0 +1,130 @@
+/**
+ * Tests for Markdown Extensions
+ * Tests TOC generation, admonition parsing, and PlantUML encoding
+ */
+
+describe('Markdown Extensions', () => {
+    describe('TOC generation from headings', () => {
+        test('extracts all heading levels', () => {
+            const html = '<h1>Title</h1><h2>Section 1</h2><h2>Section 2</h2><h3>Subsection</h3>';
+            const headingRegex = /<h([1-6])[^>]*>(.*?)<\/h[1-6]>/gi;
+            const toc = [];
+            let match;
+            while ((match = headingRegex.exec(html)) !== null) {
+                toc.push({ level: parseInt(match[1]), text: match[2] });
+            }
+            expect(toc).toHaveLength(4);
+            expect(toc[0]).toEqual({ level: 1, text: 'Title' });
+            expect(toc[3]).toEqual({ level: 3, text: 'Subsection' });
+        });
+
+        test('handles empty HTML', () => {
+            const html = '<p>No headings here</p>';
+            const headingRegex = /<h([1-6])[^>]*>(.*?)<\/h[1-6]>/gi;
+            const toc = [];
+            let match;
+            while ((match = headingRegex.exec(html)) !== null) {
+                toc.push({ level: parseInt(match[1]), text: match[2] });
+            }
+            expect(toc).toHaveLength(0);
+        });
+
+        test('handles headings with attributes', () => {
+            const html = '<h1 id="title" class="main">Title</h1><h2 id="sec">Section</h2>';
+            const headingRegex = /<h([1-6])[^>]*>(.*?)<\/h[1-6]>/gi;
+            const toc = [];
+            let match;
+            while ((match = headingRegex.exec(html)) !== null) {
+                toc.push({ level: parseInt(match[1]), text: match[2] });
+            }
+            expect(toc).toHaveLength(2);
+            expect(toc[0].text).toBe('Title');
+        });
+    });
+
+    describe('Admonition regex matching', () => {
+        test('matches note admonition', () => {
+            const src = ':::note\nThis is a note.\n:::\n';
+            const match = src.match(/^:::(note|warning|tip|danger|info)\s*\n([\s\S]*?)^:::\s*$/m);
+            expect(match).not.toBeNull();
+            expect(match[1]).toBe('note');
+            expect(match[2].trim()).toBe('This is a note.');
+        });
+
+        test('matches all admonition types', () => {
+            const types = ['note', 'warning', 'tip', 'danger', 'info'];
+            types.forEach(type => {
+                const src = `:::${type}\nContent\n:::\n`;
+                const match = src.match(/^:::(note|warning|tip|danger|info)\s*\n([\s\S]*?)^:::\s*$/m);
+                expect(match).not.toBeNull();
+                expect(match[1]).toBe(type);
+            });
+        });
+
+        test('does not match invalid admonition type', () => {
+            const src = ':::custom\nContent\n:::\n';
+            const match = src.match(/^:::(note|warning|tip|danger|info)\s*\n([\s\S]*?)^:::\s*$/m);
+            expect(match).toBeNull();
+        });
+
+        test('captures multiline content', () => {
+            const src = ':::warning\nLine 1\nLine 2\nLine 3\n:::\n';
+            const match = src.match(/^:::(note|warning|tip|danger|info)\s*\n([\s\S]*?)^:::\s*$/m);
+            expect(match).not.toBeNull();
+            expect(match[2]).toContain('Line 1');
+            expect(match[2]).toContain('Line 3');
+        });
+    });
+
+    describe('PlantUML hex encoding', () => {
+        const plantumlEncode = (text) => {
+            const hex = Array.from(Buffer.from(text, 'utf-8'))
+                .map(b => b.toString(16).padStart(2, '0'))
+                .join('');
+            return '~h' + hex;
+        };
+
+        test('encodes simple text', () => {
+            const encoded = plantumlEncode('A -> B');
+            expect(encoded).toBe('~h41202d3e2042');
+        });
+
+        test('encodes empty string', () => {
+            expect(plantumlEncode('')).toBe('~h');
+        });
+
+        test('encodes special characters', () => {
+            const encoded = plantumlEncode('@startuml');
+            expect(encoded).toMatch(/^~h[0-9a-f]+$/);
+            // '@' is 0x40, 's' is 0x73
+            expect(encoded.startsWith('~h40')).toBe(true);
+        });
+    });
+
+    describe('Slug generation for TOC anchors', () => {
+        const slugify = (text) => {
+            return text
+                .toLowerCase()
+                .replace(/[^\w\s-]/g, '')
+                .replace(/\s+/g, '-')
+                .replace(/-+/g, '-')
+                .trim();
+        };
+
+        test('converts heading to slug', () => {
+            expect(slugify('Hello World')).toBe('hello-world');
+        });
+
+        test('removes special characters', () => {
+            expect(slugify('What is C++?')).toBe('what-is-c');
+        });
+
+        test('collapses multiple dashes', () => {
+            expect(slugify('Hello   World')).toBe('hello-world');
+        });
+
+        test('handles already lowercase text', () => {
+            expect(slugify('simple')).toBe('simple');
+        });
+    });
+});

tests/preload.test.js

@@ -0,0 +1,175 @@
+/**
+ * Tests for Preload Script Security
+ * Verifies that the IPC bridge is properly configured
+ */
+
+describe('Preload Security', () => {
+  describe('Allowed Channels', () => {
+    const EXPECTED_SEND_CHANNELS = [
+      'save-file',
+      'save-current-file',
+      'set-current-file',
+      'save-recent-files',
+      'clear-recent-files',
+      'renderer-ready',
+      'get-theme',
+      'do-print',
+      'do-print-with-options',
+      'export-with-options',
+      'export-spreadsheet',
+      'batch-convert',
+      'select-folder',
+      'universal-convert',
+      'universal-convert-batch',
+      'image-convert',
+      'image-batch-convert',
+      'image-resize',
+      'image-compress',
+      'image-rotate',
+      'audio-convert',
+      'audio-batch-convert',
+      'audio-extract',
+      'audio-trim',
+      'audio-merge',
+      'video-convert',
+      'video-batch-convert',
+      'video-compress',
+      'video-trim',
+      'video-frames',
+      'video-gif',
+      'get-header-footer-settings',
+      'save-header-footer-settings',
+      'browse-header-footer-logo',
+      'save-header-footer-logo',
+      'clear-header-footer-logo',
+      'get-page-settings',
+      'update-page-settings',
+      'set-custom-start-page',
+      'process-pdf-operation',
+      'get-pdf-page-count',
+      'select-pdf-folder',
+      'open-ascii-generator',
+      'open-table-generator',
+      'insert-generated-content',
+      'save-pasted-image',
+      'load-template',
+      'list-directory',
+      'open-file-path',
+      'git-status',
+      'git-stage',
+      'git-commit',
+      'git-log',
+      'git-diff',
+      'get-snippets',
+      'save-snippet',
+      'delete-snippet',
+      'execute-code',
+      'show-pdf-editor-from-toolbar',
+      'menu-open',
+      'export'
+    ];
+
+    const EXPECTED_RECEIVE_CHANNELS = [
+      'file-new',
+      'file-opened',
+      'file-save',
+      'get-content-for-save',
+      'get-content-for-spreadsheet',
+      'recent-files-cleared',
+      'toggle-preview',
+      'toggle-find',
+      'theme-changed',
+      'theme-data',
+      'undo',
+      'redo',
+      'adjust-font-size',
+      'print-preview',
+      'print-preview-styled',
+      'show-export-dialog',
+      'show-batch-dialog',
+      'show-universal-converter-dialog',
+      'show-table-generator',
+      'show-pdf-editor-dialog',
+      'show-image-converter',
+      'show-audio-converter',
+      'show-video-converter',
+      'open-pdf-viewer',
+      'conversion-status',
+      'conversion-complete',
+      'batch-progress',
+      'image-conversion-complete',
+      'audio-conversion-complete',
+      'video-conversion-complete',
+      'folder-selected',
+      'pdf-folder-selected',
+      'header-footer-settings-data',
+      'header-footer-logo-selected',
+      'header-footer-logo-saved',
+      'header-footer-logo-cleared',
+      'page-settings-data',
+      'pdf-page-count',
+      'pdf-operation-complete',
+      'pdf-operation-error',
+      'pdf-operation-progress',
+      'show-ascii-generator-window',
+      'show-ascii-generator',
+      'show-table-generator-window',
+      'open-header-footer-dialog',
+      'insert-content',
+      'load-template-menu',
+      'toggle-command-palette',
+      'toggle-sidebar-panel',
+      'toggle-bottom-panel'
+    ];
+
+    test('should define all expected send channels', () => {
+      // This test documents expected channels
+      expect(EXPECTED_SEND_CHANNELS.length).toBeGreaterThan(0);
+    });
+
+    test('should define all expected receive channels', () => {
+      // This test documents expected channels
+      expect(EXPECTED_RECEIVE_CHANNELS.length).toBeGreaterThan(0);
+    });
+  });
+
+  describe('electronAPI Interface', () => {
+    test('should expose send method', () => {
+      expect(window.electronAPI.send).toBeDefined();
+      expect(typeof window.electronAPI.send).toBe('function');
+    });
+
+    test('should expose on method', () => {
+      expect(window.electronAPI.on).toBeDefined();
+      expect(typeof window.electronAPI.on).toBe('function');
+    });
+
+    test('should expose once method', () => {
+      expect(window.electronAPI.once).toBeDefined();
+      expect(typeof window.electronAPI.once).toBe('function');
+    });
+
+    test('should expose invoke method', () => {
+      expect(window.electronAPI.invoke).toBeDefined();
+      expect(typeof window.electronAPI.invoke).toBe('function');
+    });
+
+    test('should expose file convenience methods', () => {
+      expect(window.electronAPI.file).toBeDefined();
+      expect(window.electronAPI.file.save).toBeDefined();
+      expect(window.electronAPI.file.saveCurrent).toBeDefined();
+      expect(window.electronAPI.file.setCurrent).toBeDefined();
+    });
+
+    test('should expose theme convenience methods', () => {
+      expect(window.electronAPI.theme).toBeDefined();
+      expect(window.electronAPI.theme.get).toBeDefined();
+    });
+
+    test('should expose pdf convenience methods', () => {
+      expect(window.electronAPI.pdf).toBeDefined();
+      expect(window.electronAPI.pdf.processOperation).toBeDefined();
+      expect(window.electronAPI.pdf.getPageCount).toBeDefined();
+    });
+  });
+});

tests/print-preview.test.js

@@ -0,0 +1,109 @@
+/**
+ * @jest-environment jsdom
+ */
+
+/**
+ * Tests for PrintPreview
+ * Tests print dialog options, open/close, and preview rendering
+ */
+
+describe('PrintPreview', () => {
+    beforeEach(() => {
+        // Mock electron require for executePrint
+        jest.mock('electron', () => ({
+            ipcRenderer: { send: jest.fn(), invoke: jest.fn() }
+        }), { virtual: true });
+
+        document.body.innerHTML = `
+            <div class="dialog-overlay hidden" id="print-preview-overlay">
+                <button id="print-preview-close"></button>
+                <button id="print-cancel"></button>
+                <button id="print-execute"></button>
+                <select id="print-paper-size"><option value="A4">A4</option><option value="Letter">Letter</option></select>
+                <select id="print-orientation"><option value="portrait">Portrait</option><option value="landscape">Landscape</option></select>
+                <select id="print-margins"><option value="default">Default</option></select>
+                <input type="range" id="print-scale" value="100">
+                <span id="print-scale-value">100%</span>
+                <input type="checkbox" id="print-headers" checked>
+                <input type="checkbox" id="print-background" checked>
+                <select id="print-pages"><option value="all">All</option><option value="custom">Custom</option></select>
+                <input type="text" id="print-page-range" class="hidden">
+                <iframe id="print-preview-frame"></iframe>
+            </div>
+        `;
+    });
+
+    test('getOptions returns default values', () => {
+        const { PrintPreview } = require('../src/print-preview');
+        const preview = new PrintPreview();
+        const options = preview.getOptions();
+        expect(options.paperSize).toBe('A4');
+        expect(options.orientation).toBe('portrait');
+        expect(options.scale).toBe(100);
+        expect(options.headers).toBe(true);
+        expect(options.background).toBe(true);
+        expect(options.pages).toBe('all');
+        expect(options.margins).toBe('default');
+        expect(options.pageRange).toBe('');
+    });
+
+    test('opens and closes', () => {
+        const { PrintPreview } = require('../src/print-preview');
+        const preview = new PrintPreview();
+        preview.open('<p>Test</p>');
+        expect(document.getElementById('print-preview-overlay').classList.contains('hidden')).toBe(false);
+        preview.close();
+        expect(document.getElementById('print-preview-overlay').classList.contains('hidden')).toBe(true);
+    });
+
+    test('updateScaleLabel reflects slider value', () => {
+        const { PrintPreview } = require('../src/print-preview');
+        const preview = new PrintPreview();
+        document.getElementById('print-scale').value = '75';
+        preview.updateScaleLabel();
+        expect(document.getElementById('print-scale-value').textContent).toBe('75%');
+    });
+
+    test('close button closes preview', () => {
+        const { PrintPreview } = require('../src/print-preview');
+        const preview = new PrintPreview();
+        preview.open('<p>Test</p>');
+        document.getElementById('print-preview-close').click();
+        expect(document.getElementById('print-preview-overlay').classList.contains('hidden')).toBe(true);
+    });
+
+    test('cancel button closes preview', () => {
+        const { PrintPreview } = require('../src/print-preview');
+        const preview = new PrintPreview();
+        preview.open('<p>Test</p>');
+        document.getElementById('print-cancel').click();
+        expect(document.getElementById('print-preview-overlay').classList.contains('hidden')).toBe(true);
+    });
+
+    test('getOptions reflects changed values', () => {
+        const { PrintPreview } = require('../src/print-preview');
+        const preview = new PrintPreview();
+
+        // Change paper size to Letter
+        const paperSelect = document.getElementById('print-paper-size');
+        paperSelect.value = 'Letter';
+
+        // Change scale
+        document.getElementById('print-scale').value = '50';
+
+        // Uncheck headers
+        document.getElementById('print-headers').checked = false;
+
+        const options = preview.getOptions();
+        expect(options.paperSize).toBe('Letter');
+        expect(options.scale).toBe(50);
+        expect(options.headers).toBe(false);
+    });
+
+    test('stores last content for refresh', () => {
+        const { PrintPreview } = require('../src/print-preview');
+        const preview = new PrintPreview();
+        preview.open('<p>Hello World</p>');
+        expect(preview._lastContent).toBe('<p>Hello World</p>');
+    });
+});