Update README: Rename to MarkdownConverter, add open-source section

Major Features:
- Integrated PDF viewer with zoom, page navigation, and fit modes
- PDF editor toolbar with direct access to all PDF operations
- New app branding with docico1.png icon
- ConcreteInfo theme (light & dark variants)
- Comprehensive PDF editing: merge, split, compress, rotate, delete, reorder
- Watermark, encrypt, decrypt, and permissions management
- Overwrite original file option for all PDF operations

UI Improvements:
- PDF viewer takes full screen when active (hides tabs and toolbar)
- Compact modals with reduced font sizes
- Dark theme fixes for icons and dialogs
- Save/Save As options for PDF operations
- Improved PDF toolbar theming

Technical:
- Added isPdfViewerActive state tracking
- Proper PDF document lifecycle management
- Fixed hang issues when switching between PDF and markdown
- All dependencies are open-source (MIT, Apache 2.0, BSD)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -15,4 +15,17 @@ out/
 .cache/
 .npm/
 .electron/
-package-lock.json
+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

.prettierrc

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

CLAUDE.md

@@ -1,11 +1,11 @@
-# PanConverter - Claude Development Guide
+# MarkdownConverter - Claude Development Guide
 
 ## Project Overview
 
-**PanConverter** is a cross-platform Markdown editor and converter powered by Pandoc, built with Electron. It provides professional-grade editing capabilities with comprehensive export options.
+**MarkdownConverter** (formerly PanConverter) is a cross-platform Markdown editor and universal file converter powered by Pandoc, built with Electron. It provides professional-grade editing capabilities with comprehensive export options, media conversion, and PDF editing tools.
 
-**Current Version**: v1.9.0
+**Current Version**: v3.0.0
-**Author**: Amit Haridas (amit.wh@gmail.com)
+**Author**: Amit Haridas / ConcreteInfo (amit.wh@gmail.com)
 **License**: MIT
 **Repository**: https://github.com/amitwh/pan-converter
 
@@ -25,17 +25,28 @@
 ### Application Structure
 ```
 src/
-├── main.js            # Electron main process, menu system, IPC handlers
+├── main.js                  # Electron main process, menu system, IPC handlers
-├── renderer.js        # TabManager class, multi-file editing, event handling
+├── preload.js               # Secure IPC bridge for context isolation (v2.2.0)
-├── index.html         # Application layout with tabbed interface
+├── renderer.js              # TabManager class, multi-file editing, event handling
-├── styles.css         # Base styling with multi-theme support
+├── index.html               # Application layout with tabbed interface
-└── styles-modern.css  # Modern glassmorphism UI design system (v1.7.1)
+├── ascii-generator.html     # Separate window for ASCII Art Generator (v3.0.0)
+├── table-generator.html     # Separate window for Table Generator (v3.0.0)
+├── styles.css               # Base styling with multi-theme support
+├── styles-modern.css        # Modern glassmorphism UI design system (v1.7.1)
+├── styles-concreteinfo.css  # ConcreteInfo brand theme (v3.0.0)
+└── wordTemplateExporter.js  # Word template-based export (v1.7.9)
 
 assets/
-└── icon.png       # Application icon
+├── icon.png           # Application icon (512x512)
+├── logo.png           # ConcreteInfo logo
+├── NewIcon.jpg        # Source image for icon generation
+└── icons/             # Generated icons (16x16 to 1024x1024)
 
-package.json       # Dependencies and build configuration
+scripts/
-CLAUDE.md          # Development documentation for AI assistants
+└── generate-icons.js  # Icon generation script
+
+package.json           # Dependencies and build configuration
+CLAUDE.md              # Development documentation for AI assistants
 ```
 
 ## Development Commands
@@ -113,7 +124,185 @@ gh release create v1.2.1 --title "Title" --notes "Release notes" \
 
 ## Feature Implementation Guide
 
-### v1.9.0 Custom Headers & Footers (Latest)
+### v3.0.0 Major UI Overhaul & Media Converters (Latest)
+
+#### Rebranding & UI Improvements
+**Renamed to MarkdownConverter with ConcreteInfo Branding** (`src/index.html`, `package.json`)
+
+**Changes:**
+- Renamed application from "PanConverter" to "MarkdownConverter"
+- Added ConcreteInfo logo in app header
+- Removed preview popout button (per user feedback)
+- Version updated to 3.0.0
+
+#### ConcreteInfo Theme System
+**New Theme Based on Logo Palette** (`src/styles-concreteinfo.css`)
+
+**Color Palette:**
+- Dark Gray: #464646
+- Medium Gray: #9a9696
+- Accent (Red): #e5461f
+- Light Gray: #e3e3e3
+- Black: #0d0b09
+
+**Theme Variants:**
+- Concrete Dark - Dark mode with red accents
+- Concrete Light - Clean light mode
+- Concrete Warm - Warm tones with gray toolbar
+
+#### Separate Generator Windows
+**ASCII Art & Table Generators in Dedicated Windows** (`src/ascii-generator.html`, `src/table-generator.html`, `src/main.js`)
+
+**ASCII Art Generator Features:**
+- Text Banner mode with 5 font styles (Standard, Banner, Block, Bubble, Digital)
+- Box/Frame mode with 5 styles (Single, Double, Rounded, Bold, ASCII)
+- 16 professional templates (arrows, flowcharts, diagrams, decorative)
+- Real-time preview with terminal-style display
+- One-click insert to editor
+
+**Table Generator Features:**
+- Adjustable rows and columns (1-50 rows, 1-20 columns)
+- Quick templates (2-column, 3-column, 4x4 grid, etc.)
+- Left/Center/Right alignment
+- Optional header row
+- Fill sample data option
+- Live Markdown preview
+- Copy or insert to editor
+
+**Access:**
+- Tools → ASCII Art Generator (Ctrl+Shift+A)
+- Tools → Table Generator (Ctrl+Shift+T)
+
+#### Media Converter Menus
+**Separate Menus for Image, Audio, and Video Conversion** (`src/main.js`)
+
+**Image Menu:**
+- Convert Image... (single file)
+- Batch Convert Images...
+- Resize Image...
+- Compress Image...
+- Rotate Image...
+
+**Audio Menu:**
+- Convert Audio...
+- Batch Convert Audio...
+- Extract Audio from Video...
+- Trim Audio...
+- Merge Audio Files...
+
+**Video Menu:**
+- Convert Video...
+- Batch Convert Videos...
+- Compress Video...
+- Trim Video...
+- Extract Frames...
+- Convert to GIF...
+
+**Batch Menu:**
+- Convert Markdown Folder...
+- Batch Image Conversion...
+- Batch Audio Conversion...
+- Batch Video Conversion...
+- Batch PDF Conversion...
+
+#### Enhanced PDF Editor
+**Open PDF Files Directly** (`src/main.js`)
+
+- New "Open PDF File..." option in PDF Editor menu
+- View and edit PDFs within the application
+- All PDF operations available (merge, split, compress, rotate, etc.)
+
+#### About Menu & Dependencies
+**Updated Help Menu** (`src/main.js`)
+
+- "About MarkdownConverter" shows app info with ConcreteInfo logo
+- "Dependencies & Requirements" lists all required tools with download links:
+  - Pandoc (required)
+  - FFmpeg (optional, for media conversion)
+  - ImageMagick (optional, for image processing)
+  - LibreOffice (optional, for document conversion)
+  - MiKTeX/TeX Live (optional, for PDF via LaTeX)
+
+#### Security Enhancements (v2.2.0 continued)
+**Secure Preload Script** (`src/preload.js`)
+
+- New IPC channels for media converters
+- Secure generator window communication
+- Insert content from generator windows
+
+---
+
+### v1.9.1 ASCII Art & Code Block Preservation
+
+#### 🎨 Preserved ASCII Art in Exports
+**ASCII Art, Charts, Tables & Flowcharts Now Export Exactly as Previewed** (`src/wordTemplateExporter.js`, `src/main.js`)
+
+**Problem Solved:**
+- Previously, ASCII art, flowcharts, and code blocks were being corrupted during export to Word and PDF
+- Line breaks, spacing, and monospace alignment were lost
+- Box-drawing characters and diagrams became unreadable
+
+**Solution Implemented:**
+1. **Enhanced Word Template Exporter** (`src/wordTemplateExporter.js:259-289`)
+   - Code blocks now render each line as a separate paragraph with exact spacing
+   - `white-space: pre` and `word-wrap: normal` prevent text wrapping
+   - Monospace font (Consolas) with consistent 18pt size
+   - Light gray background (#F5F5F5) for visual distinction
+   - `<w:keepLines/>` and `<w:wordWrap w:val="0"/>` preserve exact formatting
+
+2. **Improved ASCII Art Detection** (`src/wordTemplateExporter.js:410-456`)
+   - Extended Unicode box-drawing character support (╭╮╯╰ rounded corners, heavy box characters)
+   - Additional arrow characters (↔↕⇒⇐⇓⇑)
+   - More ASCII patterns detected (+---+---+, <---->, etc.)
+   - Better markdown table vs ASCII art differentiation
+
+3. **Enhanced PDF Export** (`src/main.js:1266-1268`, `src/main.js:1345-1347`, `src/main.js:2410-2412`)
+   - Added `-V monofont="Consolas"` for monospace code blocks
+   - Added `--highlight-style=tango` for syntax highlighting
+   - Applied to main export, fallback export, and CLI conversion
+
+4. **Electron PDF Fallback** (`src/main.js:1613-1637`)
+   - Enhanced CSS for `<pre>` and `<code>` elements
+   - `white-space: pre` prevents wrapping
+   - `font-family: Consolas, Monaco, 'Courier New', monospace`
+   - Print media query preserves formatting when printing
+
+5. **HTML Export** (`src/main.js:1525-1548`)
+   - Same CSS improvements as Electron PDF
+   - Code blocks maintain exact preview appearance
+
+**Key CSS Properties for ASCII Preservation:**
+```css
+pre {
+    white-space: pre;
+    word-wrap: normal;
+    font-family: Consolas, Monaco, 'Courier New', monospace;
+    font-size: 12px;
+    line-height: 1.4;
+}
+pre code {
+    white-space: pre;
+    word-wrap: normal;
+    display: block;
+}
+```
+
+**Word XML Properties for ASCII Preservation:**
+```xml
+<w:pPr>
+    <w:spacing w:line="240" w:lineRule="exact"/>
+    <w:keepLines/>
+    <w:wordWrap w:val="0"/>
+</w:pPr>
+<w:rPr>
+    <w:rFonts w:ascii="Consolas" w:hAnsi="Consolas" w:cs="Consolas"/>
+    <w:noProof/>
+</w:rPr>
+```
+
+---
+
+### v1.9.0 Custom Headers & Footers
 
 #### 📄 Comprehensive Header & Footer System
 **Custom Headers & Footers for Standard Exports** (`src/main.js:701-853`, `src/index.html:929-1042`, `src/renderer.js:2560-2747`, `src/styles.css:3162-3432`)
@@ -1109,7 +1298,7 @@ if (!gotTheLock) {
 
 ## Pending Tasks & Future Enhancements
 
-No pending tasks at this time. All planned v1.9.0 features have been completed.
+No pending tasks at this time. All planned v1.9.1 features have been completed.
 
 ### Potential Future Enhancements
 - Image embedding in headers/footers (partially implemented - logo upload UI ready)
@@ -1119,19 +1308,19 @@ No pending tasks at this time. All planned v1.9.0 features have been completed.
 
 ---
 
-**Last Updated**: October 28, 2025
+**Last Updated**: December 12, 2025
-**Claude Assistant**: Development completed for v1.9.0 with Custom Headers & Footers!
+**Claude Assistant**: Development completed for v1.9.1 with ASCII Art Preservation!
 
-### v1.9.0 - Latest Release Summary
+### v1.9.1 - Latest Release Summary
-- **Custom Headers & Footers**: Professional headers/footers for PDF, DOCX, ODT, and PowerPoint exports
+- **ASCII Art Preservation**: Code blocks, flowcharts, tables, and ASCII art now export exactly as shown in preview
-- **Dynamic Field Support**: $PAGE$, $TOTAL$, $DATE$, $TIME$, $TITLE$, $AUTHOR$, $FILENAME$
+- **Enhanced Code Block Rendering**: Each line rendered separately to preserve exact spacing and alignment
-- **Logo Upload UI**: Ready for image embedding in headers/footers
+- **Monospace Font Support**: Consolas font used consistently across all export formats
-- **Three-Column Layout**: Left/Center/Right positioning for headers and footers
+- **Improved ASCII Detection**: Extended Unicode box-drawing and arrow character support
-- **Batch Support**: Full header/footer integration in batch converter
+- **PDF Export Enhancement**: Added monofont and highlight-style options for better code rendering
-- **Persistent Settings**: Configurations saved across sessions
+- **HTML/Electron PDF Fix**: Enhanced CSS to prevent text wrapping in code blocks
-- **Dark Theme Support**: Complete styling for all 22 themes
 
 ### Previous Releases
+- v1.9.0: Custom Headers & Footers for PDF, DOCX, ODT, PowerPoint exports
 - v1.8.3: Streamlined PDF Editor UI & Configurable Template Settings
 - v1.8.2: Enhanced PDF Export & Print Fix
 - v1.8.1: Streamlined PDF Editor UI

README.md

@@ -1,162 +1,153 @@
-# PanConverter
+# MarkdownConverter
 
-A cross-platform Markdown editor and converter powered by Pandoc.
+A powerful cross-platform Markdown editor and document converter powered by Pandoc, built with Electron. 100% open-source with no proprietary dependencies.
-
-![PanConverter](assets/icon.png)
 
 ## Features
 
-### ✨ Advanced Markdown Editor
+### Markdown Editor
-- 🗂️ **Tabbed Interface** - Work with multiple files simultaneously in separate tabs
+- **Multi-tab editing** - Work on multiple files simultaneously
-- 📝 **Rich Text Editor** - Full-featured editor with syntax highlighting and comprehensive toolbar
+- **Live preview** - Real-time markdown rendering with syntax highlighting
-- 🔍 **Find & Replace** - Powerful search and replace with match highlighting and navigation
+- **Dynamic splitter** - Drag to resize editor and preview panes
-- 🔢 **Line Numbers** - Toggle line numbers for easier code editing and navigation
+- **25+ themes** - Light and dark themes including Atom One Light, Dracula, Nord, Sepia, and more
-- ↩️ **Smart Auto-Indentation** - Automatic list continuation and intelligent indentation
+- **Find & Replace** - Search and replace with regex support
-- ⏪ **Undo/Redo** - Full undo/redo support with keyboard shortcuts
+- **Line numbers** - Toggle line numbers in the editor
-- ⌨️ **Advanced Shortcuts** - Tab indentation, line selection, and smart text formatting
+- **Auto-save** - Automatic saving every 30 seconds
-- 📂 **File Association Support** - Open markdown files directly from file manager
+- **Math support** - KaTeX integration for mathematical expressions
 
-### 🎨 Themes & Interface
+### PDF Viewer & Editor
-- 👁️ **Live Preview** - See your markdown rendered in real-time with synchronized scrolling
+- **Built-in PDF viewer** - Open and view PDF files directly in the app
-- 🎨 **Multiple Themes** - Choose from Light, Dark, Solarized, Monokai, or GitHub themes
+- **Page navigation** - Navigate pages with keyboard or buttons
-- 💾 **Auto-Save** - Never lose your work with automatic saving every 30 seconds
+- **Zoom controls** - Zoom in/out, fit to width, fit to page
-- 📊 **Enhanced Statistics** - Detailed document statistics including word count, character count, lines, paragraphs, sentences, and estimated reading time
+- **Rotation** - Rotate pages left or right
-- 🕒 **Recent Files** - Quick access to recently opened files via File menu
+- **PDF Editor tools**:
-- 🧮 **Math Support** - Render mathematical expressions using KaTeX (supports $$, $, \\[\\], \\(\\) delimiters)
+  - Merge multiple PDFs
+  - Split PDFs by page range
+  - Compress PDFs
+  - Rotate pages
+  - Delete pages
+  - Reorder pages
+  - Add watermarks
+  - Password protection
+  - Remove passwords
+  - Set permissions
 
-### 📤 Export & Conversion
+### Export Options
-- 📄 **Enhanced PDF Export** - Robust PDF generation with multiple LaTeX engine fallbacks (XeLaTeX, PDFLaTeX, wkhtmltopdf)
+- **PDF** - Export to PDF with customizable page sizes and orientation
-- 📄 **Document Export** - Convert to HTML, DOCX, LaTeX, RTF, ODT, EPUB, PowerPoint (PPTX), and OpenDocument Presentation (ODP)
+- **DOCX** - Standard and Enhanced (template-based) Word export
-- 📊 **Spreadsheet Export** - Export markdown tables to CSV format for compatibility with any spreadsheet application
+- **ODT** - OpenDocument format
-- 📥 **Document Import** - Import DOCX, ODT, RTF, HTML, PDF, and presentation files to markdown
+- **HTML** - Web-ready HTML export
-- 📋 **Table Creation Helper** - Built-in table generator for easy markdown table creation
+- **PowerPoint** - PPTX presentation export
+- **EPUB** - E-book format
+- **LaTeX** - Academic document format
+- **RTF** - Rich Text Format
 
-### 🖥️ Platform Support
+### Advanced Features
-- **Cross-Platform** - Works seamlessly on Windows, macOS, and Linux
+- **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
+- [Node.js](https://nodejs.org/) (v16 or later)
-  - **Ubuntu/Debian**: `sudo apt-get install pandoc`
+- [Pandoc](https://pandoc.org/installing.html) (required for export functionality)
-  - **macOS**: `brew install pandoc`
-  - **Windows**: Download installer from Pandoc website
 
-### PDF Export Requirements
+### Install Dependencies
-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
 ```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
+# macOS
-1. **Write** - Use the editor to write your Markdown content
+npm run build:mac
-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
 
-### Export Options
+# Linux
-- **Documents**: HTML, PDF, DOCX, LaTeX, RTF, ODT, EPUB
+npm run build:linux
-- **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
 
 ## Keyboard Shortcuts
 
-### File Operations
+| Action | Shortcut |
-- `Ctrl/Cmd + N` - New file/tab
+|--------|----------|
-- `Ctrl/Cmd + T` - New tab
+| New File | Ctrl+N |
-- `Ctrl/Cmd + W` - Close current tab
+| Open File | Ctrl+O |
-- `Ctrl/Cmd + Tab` - Switch to next tab
+| Open PDF | Ctrl+Shift+O |
-- `Ctrl/Cmd + O` - Open file
+| Save | Ctrl+S |
-- `Ctrl/Cmd + S` - Save file
+| Save As | Ctrl+Shift+S |
-- `Ctrl/Cmd + Shift + S` - Save as
+| Export | Ctrl+E |
-- `Ctrl/Cmd + I` - Import document
+| 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
+## Themes
-- `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
 
-### View & Navigation
+### Light Themes
-- `Ctrl/Cmd + P` - Toggle preview
+- Atom One Light (Default)
-- `Ctrl/Cmd + Enter` - Toggle preview (alternative)
+- GitHub Light
-- `Escape` - Close find dialog
+- 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
+## PDF Viewer
-# Install dependencies
-npm install
 
-# Generate icons
+Open PDF files directly in MarkdownConverter:
-npm run generate-icons
+- **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
+## Open Source
-npm run build
 
-# Build for specific platform
+MarkdownConverter is 100% open-source. All dependencies are permissively licensed:
-npm run build:win    # Windows
+- **Electron** - MIT License
-npm run build:mac    # macOS  
+- **pdf-lib** - MIT License
-npm run build:linux  # Linux (generates .deb, .AppImage, and .snap)
+- **pdfjs-dist** - Apache 2.0 License
-
+- **marked** - MIT License
-# Build for all platforms
+- **highlight.js** - BSD 3-Clause License
-npm run dist:all
+- **dompurify** - Apache 2.0/MIT License
-```
+- **docx** - MIT License
-
+- **xlsx** - Apache 2.0 License (SheetJS Community Edition)
-## 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).
 
 ## License
 
@@ -164,13 +155,8 @@ 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/)
+v3.0.0
-- 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)

UPDATES.md

@@ -0,0 +1,166 @@
+# PanConverter - Updates & Changelog
+
+## 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 +1,89 @@
+/**
+ * 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',
+        Event: 'readonly',
+        CustomEvent: 'readonly',
+        HTMLElement: 'readonly',
+        MutationObserver: 'readonly',
+        // Electron
+        electronAPI: 'readonly',
+        // Libraries
+        marked: 'readonly',
+        DOMPurify: 'readonly',
+        hljs: 'readonly',
+        mermaid: 'readonly',
+        // 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 +1,59 @@
+/**
+ * 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
+    '!**/node_modules/**'
+  ],
+
+  // Coverage thresholds (start low, increase over time)
+  coverageThreshold: {
+    global: {
+      branches: 10,
+      functions: 10,
+      lines: 10,
+      statements: 10
+    }
+  },
+
+  // 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",
+  "name": "markdown-converter",
-  "version": "1.9.0",
+  "version": "3.0.0",
-  "description": "Cross-platform Markdown editor and converter using Pandoc",
+  "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",
@@ -19,14 +26,29 @@
     "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": {
@@ -40,14 +62,15 @@
     "html2pdf.js": "^0.10.1",
     "marked": "^16.2.1",
     "pdf-lib": "^1.17.1",
+    "pdfjs-dist": "^3.11.174",
     "pdfkit": "^0.14.0",
     "pizzip": "^3.2.0",
     "tslib": "^2.8.1",
     "xlsx": "^0.18.5"
   },
   "build": {
-    "appId": "com.panconverter.app",
+    "appId": "com.concreteinfo.markdownconverter",
-    "productName": "PanConverter",
+    "productName": "MarkdownConverter",
     "directories": {
       "output": "dist"
     },
@@ -73,10 +96,18 @@
         "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 +141,7 @@
       "displayLanguageSelector": true,
       "createDesktopShortcut": true,
       "createStartMenuShortcut": true,
-      "shortcutName": "PanConverter",
+      "shortcutName": "MarkdownConverter",
       "runAfterFinish": true,
       "menuCategory": "Productivity",
       "license": "LICENSE",
@@ -123,16 +154,29 @@
       "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",
+      "description": "Professional Markdown editor and universal file converter",
-      "maintainer": "Amit Haridas <amit.wh@gmail.com>"
+      "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 = {
+// Source image
-    'icon.png': 512,
+const sourceImage = path.join(__dirname, '..', 'assets', 'docico1.png');
-    'icon@2x.png': 1024,
+const assetsDir = path.join(__dirname, '..', 'assets');
-    'icon.ico': 256,
-    'icon.icns': 512
-};
 
-const svgPath = path.join(__dirname, '..', 'assets', 'icon.svg');
+// Icon sizes needed for different platforms
-const svgBuffer = fs.readFileSync(svgPath);
+const iconSizes = [16, 24, 32, 48, 64, 128, 256, 512, 1024];
 
 async function generateIcons() {
-    for (const [filename, size] of Object.entries(sizes)) {
+  console.log('Generating icons from docico1.png...');
-        const outputPath = path.join(__dirname, '..', 'assets', filename);
+
-        
+  // Check if source exists
-        if (filename.endsWith('.png')) {
+  if (!fs.existsSync(sourceImage)) {
-            await sharp(svgBuffer)
+    console.error('Source image not found:', sourceImage);
-                .resize(size, size)
+    process.exit(1);
-                .png()
+  }
-                .toFile(outputPath);
+
-            console.log(`Generated ${filename}`);
+  try {
-        } else if (filename.endsWith('.ico')) {
+    // Generate main icon.png (512x512)
-            // For ICO, we'll just use the PNG version
+    await sharp(sourceImage)
-            await sharp(svgBuffer)
+      .resize(512, 512, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
-                .resize(size, size)
+      .png()
-                .png()
+      .toFile(path.join(assetsDir, 'icon.png'));
-                .toFile(outputPath.replace('.ico', '.png'));
+    console.log('Generated icon.png (512x512)');
-            console.log(`Generated ${filename.replace('.ico', '.png')} (use png2ico to convert)`);
+
-        } else if (filename.endsWith('.icns')) {
+    // Generate icon@2x.png (1024x1024)
-            // For ICNS, we'll just use the PNG version
+    await sharp(sourceImage)
-            await sharp(svgBuffer)
+      .resize(1024, 1024, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
-                .resize(size, size)
+      .png()
-                .png()
+      .toFile(path.join(assetsDir, 'icon@2x.png'));
-                .toFile(outputPath.replace('.icns', '.png'));
+    console.log('Generated icon@2x.png (1024x1024)');
-            console.log(`Generated ${filename.replace('.icns', '.png')} (use png2icns to convert)`);
+
-        }
+    // Create icons directory for multi-size icons
+    const iconsDir = path.join(assetsDir, 'icons');
+    if (!fs.existsSync(iconsDir)) {
+      fs.mkdirSync(iconsDir, { recursive: true });
     }
+
+    // Generate all sizes
+    for (const size of iconSizes) {
+      await sharp(sourceImage)
+        .resize(size, size, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
+        .png()
+        .toFile(path.join(iconsDir, `${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/index.html

@@ -3,17 +3,26 @@
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>PanConverter - Markdown Editor</title>
+    <title>MarkdownConverter</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">
     <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="styles-concreteinfo.css">
-    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/default.min.css">
+    <!-- Load external resources asynchronously -->
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/default.min.css" media="print" onload="this.media='all'">
+    <script defer src="https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.min.js"></script>
 </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">v3.0.0</span>
+            </div>
+        </div>
         <div class="tab-bar" id="tab-bar">
             <div class="tab active" data-tab-id="1">
                 <span class="tab-title">Untitled</span>
@@ -148,6 +157,19 @@
                 </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 +265,37 @@
                     </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 +311,180 @@
             </div>
         </div>
 
+        <!-- Command Palette -->
+        <div id="command-palette" class="command-palette hidden">
+            <div class="command-palette-content">
+                <input type="text" id="command-search" placeholder="Type a command..." autofocus>
+                <div id="command-list" class="command-list"></div>
+                <div class="command-palette-footer">
+                    <span>↑↓ Navigate</span>
+                    <span>Enter Execute</span>
+                    <span>Esc Close</span>
+                </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 +877,13 @@
                             </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>
+                                <input type="text" id="compress-output-path" placeholder="Select save location..." readonly>
-                                <button id="browse-compress-output">Browse</button>
+                                <button id="browse-compress-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -681,10 +911,13 @@
                             </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>
+                                <input type="text" id="rotate-output-path" placeholder="Select save location..." readonly>
-                                <button id="browse-rotate-output">Browse</button>
+                                <button id="browse-rotate-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -704,10 +937,13 @@
                             <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>
+                                <input type="text" id="delete-output-path" placeholder="Select save location..." readonly>
-                                <button id="browse-delete-output">Browse</button>
+                                <button id="browse-delete-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -733,10 +969,13 @@
                             </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>
+                                <input type="text" id="reorder-output-path" placeholder="Select save location..." readonly>
-                                <button id="browse-reorder-output">Browse</button>
+                                <button id="browse-reorder-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -789,10 +1028,13 @@
                             <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>
+                                <input type="text" id="watermark-output-path" placeholder="Select save location..." readonly>
-                                <button id="browse-watermark-output">Browse</button>
+                                <button id="browse-watermark-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -838,10 +1080,13 @@
                             <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>
+                                <input type="text" id="encrypt-output-path" placeholder="Select save location..." readonly>
-                                <button id="browse-encrypt-output">Browse</button>
+                                <button id="browse-encrypt-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -861,10 +1106,13 @@
                             <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>
+                                <input type="text" id="decrypt-output-path" placeholder="Select save location..." readonly>
-                                <button id="browse-decrypt-output">Browse</button>
+                                <button id="browse-decrypt-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -901,10 +1149,13 @@
                             </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>
+                                <input type="text" id="permissions-output-path" placeholder="Select save location..." readonly>
-                                <button id="browse-permissions-output">Browse</button>
+                                <button id="browse-permissions-output">Save As</button>
                             </div>
                         </div>
                     </div>
@@ -964,7 +1215,7 @@
                             </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 +1243,7 @@
                             </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>
@@ -1049,10 +1300,106 @@
                         <textarea id="editor-1" class="editor-textarea"></textarea>
                     </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 class="status-bar">

src/preload.js

@@ -0,0 +1,376 @@
+/**
+ * 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 2.2.0
+ */
+
+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',
+
+  // 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'
+];
+
+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'
+];
+
+/**
+ * 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/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.css

@@ -10,6 +10,10 @@ body {
     height: 100vh;
 }
 
+.hidden {
+    display: none !important;
+}
+
 .container {
     display: flex;
     flex-direction: column;
@@ -156,7 +160,54 @@ 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;
+}
+
+/* Preview Header */
+.preview-header {
+    display: flex;
+    justify-content: flex-end;
+    align-items: center;
+    padding: 4px 8px;
+    background: #f6f8fa;
+    border-bottom: 1px solid #dfe2e5;
+    min-height: 32px;
+}
+
+.preview-popout-btn {
+    background: transparent;
+    border: none;
+    border-radius: 3px;
+    padding: 2px 6px;
+    cursor: pointer;
+    font-size: 11px;
+    color: #8c959f;
+    opacity: 0.5;
+    transition: all 0.2s;
+}
+
+.preview-popout-btn:hover {
+    background: rgba(0, 0, 0, 0.05);
+    opacity: 1;
+    color: #24292f;
 }
 
 .editor-textarea {
@@ -207,10 +258,15 @@ 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;
 }
 
 /* Status Bar */
@@ -251,22 +307,25 @@ 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);
+    background-color: #f6f8fa;
-    border-radius: 3px;
+    border: 1px solid #d0d7de;
-    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
+    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 +348,126 @@ 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 +505,11 @@ 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 +1031,82 @@ body.theme-github .status-bar {
 
 .export-dialog-content {
     background: #fff;
-    border-radius: 8px;
+    border-radius: 6px;
-    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
+    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
-    width: 90%;
+    width: 85%;
-    max-width: 600px;
+    max-width: 450px;
-    max-height: 90vh;
+    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;
+    font-weight: 500;
-    margin-bottom: 8px;
+    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 +1310,10 @@ body.theme-dark #add-metadata-field {
 
 /* PDF Editor Specific Styles */
 .pdf-editor-content {
-    max-width: 600px !important;
+    max-width: 450px !important;
-    max-height: 85vh;
+    max-height: 75vh;
     overflow-y: auto;
+    font-size: 12px;
 }
 
 .pdf-editor-body {
@@ -1238,12 +1449,13 @@ body.theme-dark #export-dialog-close:hover {
 
 .batch-dialog-content {
     background: #fff;
-    border-radius: 8px;
+    border-radius: 6px;
-    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
+    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
-    width: 90%;
+    width: 85%;
-    max-width: 500px;
+    max-width: 450px;
-    max-height: 80vh;
+    max-height: 75vh;
     overflow-y: auto;
+    font-size: 12px;
 }
 
 .batch-dialog-header {
@@ -1516,6 +1728,42 @@ 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 +3184,250 @@ 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 +3804,22 @@ 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);
@@ -3429,4 +3937,144 @@ body[data-theme="dark"] .field-option {
 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;
+}
+
+/* Command Palette Styles */
+.command-palette {
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background: rgba(0, 0, 0, 0.7);
+    display: flex;
+    align-items: flex-start;
+    justify-content: center;
+    padding-top: 100px;
+    z-index: 10000;
+}
+
+.command-palette.hidden {
+    display: none;
+}
+
+.command-palette-content {
+    background: #fff;
+    border-radius: 12px;
+    width: 600px;
+    max-width: 90%;
+    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
+    overflow: hidden;
+}
+
+#command-search {
+    width: 100%;
+    padding: 20px;
+    font-size: 18px;
+    border: none;
+    border-bottom: 1px solid #e0e0e0;
+    outline: none;
+}
+
+.command-list {
+    max-height: 400px;
+    overflow-y: auto;
+}
+
+.command-item {
+    padding: 12px 20px;
+    cursor: pointer;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    transition: background 0.15s;
+}
+
+.command-item:hover,
+.command-item.selected {
+    background: #f0f0f0;
+}
+
+.command-name {
+    font-weight: 500;
+}
+
+.command-shortcut {
+    font-size: 12px;
+    color: #666;
+    background: #f5f5f5;
+    padding: 3px 8px;
+    border-radius: 3px;
+}
+
+.command-palette-footer {
+    padding: 12px 20px;
+    background: #f9f9f9;
+    border-top: 1px solid #e0e0e0;
+    display: flex;
+    gap: 20px;
+    font-size: 12px;
+    color: #666;
+}
+
+/* Dark theme support for command palette */
+body.theme-dark .command-palette-content {
+    background: #2d2d2d;
+    color: #f0f0f0;
+}
+
+body.theme-dark #command-search {
+    background: #2d2d2d;
+    color: #f0f0f0;
+    border-color: #444;
+}
+
+body.theme-dark .command-item:hover,
+body.theme-dark .command-item.selected {
+    background: #3d3d3d;
+}
+
+body.theme-dark .command-shortcut {
+    background: #3d3d3d;
+    color: #ccc;
+}
+
+body.theme-dark .command-palette-footer {
+    background: #252525;
+    border-color: #444;
+    color: #999;
+}

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/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>
+        lines.forEach((line, index) => {
-            <w:pPr>
+            const escapedLine = this.escapeXml(line);
-                <w:pStyle w:val="Code"/>
+
-            </w:pPr>
+            // Each line gets its own paragraph with exact spacing and no wrapping
-            <w:r>
+            // Shading (shd) is at paragraph level so background extends full width
-                <w:rPr>
+            xml += `<w:p>
-                    <w:rFonts w:ascii="Consolas" w:hAnsi="Consolas"/>
+                <w:pPr>
-                    <w:sz w:val="18"/>
+                    <w:pStyle w:val="Normal"/>
-                </w:rPr>
+                    <w:shd w:val="clear" w:color="auto" w:fill="F5F5F5"/>
-                <w:t xml:space="preserve">${escapedCode}</w:t>
+                    <w:spacing w:before="${index === 0 ? '120' : '0'}" w:after="${index === lines.length - 1 ? '120' : '0'}" w:line="240" w:lineRule="exact"/>
-            </w:r>
+                    <w:ind w:left="284" w:right="284"/>
-        </w:p>`;
+                    <w:jc w:val="left"/>
+                    <w:keepLines/>
+                    <w:wordWrap w:val="0"/>
+                </w:pPr>
+                <w:r>
+                    <w:rPr>
+                        <w:rFonts w:ascii="Consolas" w:hAnsi="Consolas" w:cs="Consolas"/>
+                        <w:sz w:val="18"/>
+                        <w:szCs w:val="18"/>
+                        <w:noProof/>
+                    </w:rPr>
+                    <w:t xml:space="preserve">${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
+            '╭', '╮', '╯', '╰',                                      // Rounded corners
-            '↓', '→', '←', '↑',                                      // Arrows
+            '▲', '▼', '◄', '►', '♦', '●', '○', '■', '□', '◆', '◇',  // 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/preload.test.js

@@ -0,0 +1,121 @@
+/**
+ * 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',
+      'export-with-options',
+      'export-spreadsheet',
+      'batch-convert',
+      'select-folder',
+      'universal-convert',
+      'universal-convert-batch',
+      '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'
+    ];
+
+    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',
+      'conversion-status',
+      'conversion-complete',
+      'batch-progress',
+      'folder-selected',
+      'pdf-folder-selected',
+      'header-footer-settings-data',
+      'header-footer-logo-selected',
+      'header-footer-logo-saved',
+      'page-settings-data',
+      'pdf-page-count',
+      'pdf-operation-complete',
+      'pdf-operation-error'
+    ];
+
+    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/setup.js

@@ -0,0 +1,100 @@
+/**
+ * Jest Test Setup
+ * Provides mocks and utilities for PanConverter tests
+ */
+
+// Mock window.electronAPI for renderer tests
+global.window = global.window || {};
+global.window.electronAPI = {
+  send: jest.fn(),
+  on: jest.fn(() => jest.fn()), // Returns cleanup function
+  once: jest.fn(),
+  invoke: jest.fn(() => Promise.resolve(null)),
+  removeAllListeners: jest.fn(),
+  file: {
+    save: jest.fn(),
+    saveCurrent: jest.fn(),
+    setCurrent: jest.fn(),
+    saveRecent: jest.fn(),
+    clearRecent: jest.fn(),
+    rendererReady: jest.fn()
+  },
+  theme: {
+    get: jest.fn()
+  },
+  print: {
+    doPrint: jest.fn()
+  },
+  export: {
+    withOptions: jest.fn(),
+    spreadsheet: jest.fn()
+  },
+  batch: {
+    convert: jest.fn(),
+    selectFolder: jest.fn()
+  },
+  converter: {
+    convert: jest.fn(),
+    convertBatch: jest.fn()
+  },
+  headerFooter: {
+    getSettings: jest.fn(),
+    saveSettings: jest.fn(),
+    browseLogo: jest.fn(),
+    saveLogo: jest.fn(),
+    clearLogo: jest.fn()
+  },
+  page: {
+    getSettings: jest.fn(),
+    updateSettings: jest.fn(),
+    setCustomStartPage: jest.fn()
+  },
+  pdf: {
+    processOperation: jest.fn(),
+    getPageCount: jest.fn(),
+    selectFolder: jest.fn()
+  }
+};
+
+// Mock marked library
+global.window.marked = {
+  parse: jest.fn((text) => `<p>${text}</p>`),
+  setOptions: jest.fn()
+};
+
+// Mock DOMPurify
+global.window.DOMPurify = {
+  sanitize: jest.fn((html) => html)
+};
+
+// Mock highlight.js
+global.window.hljs = {
+  highlight: jest.fn((code, options) => ({ value: code })),
+  highlightAuto: jest.fn((code) => ({ value: code })),
+  getLanguage: jest.fn(() => true)
+};
+
+// Mock localStorage
+const localStorageMock = {
+  getItem: jest.fn(),
+  setItem: jest.fn(),
+  removeItem: jest.fn(),
+  clear: jest.fn()
+};
+global.localStorage = localStorageMock;
+
+// Console spy to catch unintended console logs in tests
+const originalConsoleError = console.error;
+console.error = (...args) => {
+  // Allow certain expected errors
+  const message = args[0]?.toString() || '';
+  if (message.includes('Warning:') || message.includes('React')) {
+    return;
+  }
+  originalConsoleError.apply(console, args);
+};
+
+// Cleanup after each test
+afterEach(() => {
+  jest.clearAllMocks();
+});

tests/utils.test.js

@@ -0,0 +1,137 @@
+/**
+ * Tests for Utility Functions
+ * Tests helper functions that can be extracted and tested
+ */
+
+describe('Utility Functions', () => {
+  describe('parseCommand', () => {
+    // This function parses command strings into command and args
+    function parseCommand(cmdString) {
+      const parts = [];
+      let current = '';
+      let inQuotes = false;
+      let quoteChar = '';
+
+      for (let i = 0; i < cmdString.length; i++) {
+        const char = cmdString[i];
+        if ((char === '"' || char === "'") && !inQuotes) {
+          inQuotes = true;
+          quoteChar = char;
+        } else if (char === quoteChar && inQuotes) {
+          inQuotes = false;
+          quoteChar = '';
+        } else if (char === ' ' && !inQuotes) {
+          if (current) {
+            parts.push(current);
+            current = '';
+          }
+        } else {
+          current += char;
+        }
+      }
+      if (current) {
+        parts.push(current);
+      }
+
+      return {
+        command: parts[0],
+        args: parts.slice(1)
+      };
+    }
+
+    test('should parse simple command', () => {
+      const result = parseCommand('pandoc input.md -o output.pdf');
+      expect(result.command).toBe('pandoc');
+      expect(result.args).toEqual(['input.md', '-o', 'output.pdf']);
+    });
+
+    test('should handle double-quoted paths', () => {
+      const result = parseCommand('pandoc "C:/path with spaces/file.md" -o output.pdf');
+      expect(result.command).toBe('pandoc');
+      expect(result.args).toEqual(['C:/path with spaces/file.md', '-o', 'output.pdf']);
+    });
+
+    test('should handle single-quoted paths', () => {
+      const result = parseCommand("pandoc 'file name.md' -o output.pdf");
+      expect(result.command).toBe('pandoc');
+      expect(result.args).toEqual(['file name.md', '-o', 'output.pdf']);
+    });
+
+    test('should handle multiple options', () => {
+      const result = parseCommand('pandoc input.md --pdf-engine=xelatex -V geometry:margin=1in -o output.pdf');
+      expect(result.command).toBe('pandoc');
+      expect(result.args).toContain('--pdf-engine=xelatex');
+      expect(result.args).toContain('-V');
+    });
+
+    test('should handle empty command', () => {
+      const result = parseCommand('');
+      expect(result.command).toBeUndefined();
+      expect(result.args).toEqual([]);
+    });
+  });
+
+  describe('hexToRgb', () => {
+    // This function converts hex colors to RGB
+    function hexToRgb(hex) {
+      const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+      return result ? {
+        r: parseInt(result[1], 16) / 255,
+        g: parseInt(result[2], 16) / 255,
+        b: parseInt(result[3], 16) / 255
+      } : null;
+    }
+
+    test('should convert black hex to RGB', () => {
+      const result = hexToRgb('#000000');
+      expect(result).toEqual({ r: 0, g: 0, b: 0 });
+    });
+
+    test('should convert white hex to RGB', () => {
+      const result = hexToRgb('#ffffff');
+      expect(result).toEqual({ r: 1, g: 1, b: 1 });
+    });
+
+    test('should convert red hex to RGB', () => {
+      const result = hexToRgb('#ff0000');
+      expect(result.r).toBeCloseTo(1);
+      expect(result.g).toBeCloseTo(0);
+      expect(result.b).toBeCloseTo(0);
+    });
+
+    test('should handle hex without hash', () => {
+      const result = hexToRgb('00ff00');
+      expect(result.r).toBeCloseTo(0);
+      expect(result.g).toBeCloseTo(1);
+      expect(result.b).toBeCloseTo(0);
+    });
+
+    test('should return null for invalid hex', () => {
+      expect(hexToRgb('invalid')).toBeNull();
+      expect(hexToRgb('#xyz')).toBeNull();
+    });
+  });
+
+  describe('File Path Utilities', () => {
+    test('should extract file extension', () => {
+      const getExtension = (filepath) => {
+        const match = filepath.match(/\.([^/.]+)$/);
+        return match ? match[1].toLowerCase() : '';
+      };
+
+      expect(getExtension('file.md')).toBe('md');
+      expect(getExtension('document.PDF')).toBe('pdf');
+      expect(getExtension('path/to/file.docx')).toBe('docx');
+      expect(getExtension('noextension')).toBe('');
+    });
+
+    test('should replace file extension', () => {
+      const replaceExtension = (filepath, newExt) => {
+        return filepath.replace(/\.[^/.]+$/, `.${newExt}`);
+      };
+
+      expect(replaceExtension('file.md', 'pdf')).toBe('file.pdf');
+      expect(replaceExtension('path/to/doc.docx', 'html')).toBe('path/to/doc.html');
+    });
+  });
+});