Version 1.7.3 - Bug Fixes and ConcreteInfo Themes

Fixed critical file opening bug and theme visibility issues, plus added ConcreteInfo branded themes.

Bug Fixes:
• Fixed double-click file opening race condition
  - Removed setTimeout logic from did-finish-load handler
  - Now relies solely on renderer-ready IPC signal for proper initialization
  - Files from Windows Explorer now open correctly on first attempt

• Fixed theme preview text visibility for 14 themes
  - Added proper .pane:last-child background overrides
  - Fixed dark text on dark backgrounds and light text on light backgrounds
  - Affected themes: Dracula, Nord, One Dark, Atom One Light, Material,
    Gruvbox Dark/Light, Tokyo Night, Palenight, Ayu Dark/Light/Mirage,
    Oceanic Next, Cobalt2

New Features:
• Added 3 ConcreteInfo branded themes
  - Concrete Dark: Very dark theme with orange accents
  - Concrete Light: Light theme with orange accents
  - Concrete Warm: Mid-tone gray theme with orange accents
  - All themes use ConcreteInfo brand colors: #0d0b09, #464646, #9a9696, #e3e3e3, #e5461f

• Updated theme count from 19 to 22 themes

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

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

.claude/settings.local.json

@@ -0,0 +1,33 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(git checkout:*)",
+      "Bash(npm install)",
+      "Bash(npm run build:*)",
+      "Bash(rmdir:*)",
+      "Bash(powershell:*)",
+      "Bash(npx electron-builder:*)",
+      "Bash(dir dist)",
+      "Bash(git tag:*)",
+      "Bash(git push:*)",
+      "Bash(gh release create:*)",
+      "Bash(gh auth:*)",
+      "Bash(gh release delete:*)",
+      "Bash(gh release list:*)",
+      "Bash(gh release upload:*)",
+      "Bash(npm install:*)",
+      "Bash(npm uninstall:*)",
+      "Bash(git add:*)",
+      "Bash(git commit:*)",
+      "Bash(npm start)",
+      "Read(//h/**)",
+      "Bash(cd:*)",
+      "Bash(npm run build:win-unsigned:*)",
+      "Bash(dir:*)",
+      "Bash(git merge:*)",
+      "Bash(timeout:*)",
+      "Bash(findstr:*)"
+    ],
+    "deny": []
+  }
+}

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

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

CLAUDE.md

@@ -1,189 +1,603 @@
-# Pan Converter
+# PanConverter - Claude Development Guide
 
-## Overview
+## Project Overview
-Pan Converter is a cross-platform desktop application for editing and converting Markdown files using Pandoc. It features a rich markdown editor with live preview, multiple themes, and support for exporting to various formats.
 
-## Features
+**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.
-- **Markdown Editor**: Full-featured editor with syntax highlighting
-- **Live Preview**: Real-time preview of your markdown content
-- **Multiple Themes**: Light, Dark, Solarized, Monokai, and GitHub themes
-- **Format Conversion**: Export to HTML, PDF, DOCX, LaTeX, RTF, ODT, and EPUB using Pandoc
-- **Cross-Platform**: Runs on Windows, macOS, and Linux
-- **Auto-Save**: Automatic saving every 30 seconds
 
-## Requirements
+**Current Version**: v1.7.2
-- **Pandoc**: Must be installed on the system for export functionality
+**Author**: Amit Haridas (amit.wh@gmail.com)
-  - Ubuntu/Debian: `sudo apt-get install pandoc`
+**License**: MIT
-  - macOS: `brew install pandoc`
+**Repository**: https://github.com/amitwh/pan-converter
-  - Windows: Download from https://pandoc.org/installing.html
 
-## Development Setup
+## Architecture & Technology Stack
+
+### Core Technologies
+- **Electron** - Cross-platform desktop application framework
+- **Pandoc** - Universal document converter (required system dependency)
+- **ConvertAPI** - Cloud-based file conversion (200+ formats)
+- **marked** - Markdown parsing and rendering
+- **highlight.js** - Syntax highlighting
+- **KaTeX** - Mathematical expression rendering
+- **DOMPurify** - HTML sanitization
+
+### Application Structure
+```
+src/
+├── main.js            # Electron main process, menu system, IPC handlers
+├── renderer.js        # TabManager class, multi-file editing, event handling
+├── index.html         # Application layout with tabbed interface
+├── styles.css         # Base styling with multi-theme support
+└── styles-modern.css  # Modern glassmorphism UI design system (v1.7.1)
+
+assets/
+└── icon.png       # Application icon
+
+package.json       # Dependencies and build configuration
+CLAUDE.md          # Development documentation for AI assistants
+```
+
+## Development Commands
 
 ### Prerequisites
-- Node.js (v14 or higher)
-- npm or yarn
-- Pandoc (for export features)
-
-### Installation
 ```bash
-# Clone the repository
+# Install Node.js dependencies
-git clone <repository-url>
-cd pan-converter
-
-# Install dependencies
 npm install
 
-# Generate icons
+# Install Pandoc (required for export functionality)
+# Ubuntu/Debian:
+sudo apt-get install pandoc
+
+# macOS:
+brew install pandoc
+
+# Windows: Download from https://pandoc.org/installing.html
+```
+
+### Running the Application
+```bash
+# Start development server
+npm start
+
+# Start with debugging
+npm start --enable-logging
+```
+
+### Building & Packaging
+
+```bash
+# Generate application icons
 npm run generate-icons
 
-# Start the application
+# Build for current platform
-npm start
-```
-
-## Building
-
-### Build for Current Platform
-```bash
 npm run build
-```
 
-### Build for Specific Platforms
+# Platform-specific builds
-```bash
+npm run build:win      # Windows
-# Windows
+npm run build:mac      # macOS
-npm run build:win
+npm run build:linux    # Linux (AppImage, .deb, .snap)
 
-# macOS
+# Build for all platforms
-npm run build:mac
-
-# Linux (generates .deb, .AppImage, and .snap)
-npm run build:linux
-```
-
-### Build for All Platforms
-```bash
 npm run dist:all
 ```
 
-## Project Structure
+### Git Branch Management
-```
+```bash
-pan-converter/
+# Switch to platform-specific branches
-├── src/
+git checkout linux    # Linux development
-│   ├── main.js         # Main process
+git checkout macos     # macOS development  
-│   ├── renderer.js     # Renderer process
+git checkout windows   # Windows development
-│   ├── index.html      # Main window HTML
+git checkout master    # Main development branch
-│   └── styles.css      # Application styles
+
-├── assets/
+# Update all branches with latest changes
-│   ├── icon.svg        # Source icon
+git checkout master
-│   └── icon.png        # Generated icons
+git push origin master
-├── scripts/
+git checkout linux && git merge master && git push origin linux
-│   └── generate-icons.js # Icon generation script
+git checkout macos && git merge master && git push origin macos
-├── package.json        # Project configuration
+git checkout windows && git merge master && git push origin windows
-└── CLAUDE.md          # This file
 ```
 
-## Architecture
+### Release Management
+```bash
+# Create and push release tag
+git tag v1.2.1 -m "Release message"
+git push origin v1.2.1
+
+# Create GitHub release with packages
+gh release create v1.2.1 --title "Title" --notes "Release notes" \
+  "dist/PanConverter-1.2.1.AppImage" \
+  "dist/pan-converter_1.2.1_amd64.deb" \
+  "dist/pan-converter_1.2.1_amd64.snap"
+```
+
+## Feature Implementation Guide
+
+### v1.7.2 Enhanced Themes & Bug Fixes (Latest)
+
+#### 🎨 14 New Beautiful Themes
+**Expanded Theme Collection** (`src/main.js:242-266`, `src/styles.css:1590-2555`)
+- **Added 14 new professionally-designed themes** bringing the total to 19 themes
+- **New Themes Include**:
+  - **Dracula** - Popular purple and pink dark theme
+  - **Nord** - Arctic-inspired blue theme
+  - **One Dark** - Atom's iconic dark theme
+  - **Atom One Light** - Clean, bright light theme
+  - **Material** - Google Material Design inspired
+  - **Gruvbox Dark** - Warm retro groove colors (dark)
+  - **Gruvbox Light** - Warm retro groove colors (light)
+  - **Tokyo Night** - Modern Japanese-inspired dark theme
+  - **Palenight** - Soft purple Material Design variant
+  - **Ayu Dark** - Simple, elegant dark theme
+  - **Ayu Light** - Minimalist light theme
+  - **Ayu Mirage** - Balanced dark-light hybrid
+  - **Oceanic Next** - Ocean-inspired teal and blue
+  - **Cobalt2** - Deep blue with yellow accents
+
+**Technical Implementation:**
+- Complete CSS styling for all UI elements per theme
+- Consistent theming across tabs, toolbar, editor, preview, and status bar
+- Theme-aware color schemes for syntax highlighting
+- All themes support glassmorphism effects from v1.7.1
+
+#### 🐛 Undo/Redo Fix
+**Fixed Menu Integration** (`src/renderer.js:1107-1118`)
+- Fixed undo/redo menu items not connecting to custom undo/redo functionality
+- Added IPC event listeners in renderer to receive 'undo' and 'redo' messages
+- Connected Edit menu commands to TabManager's undo() and redo() methods
+- Keyboard shortcuts (Ctrl+Z, Ctrl+Shift+Z) now work correctly with custom undo stack
+
+### v1.7.1 Modern UI Design
+
+#### 🎨 Glassmorphism & Gradient UI
+**Modern Design System** (`src/styles-modern.css`, `src/index.html:7-11`)
+- **Glassmorphism Effects** - Translucent backgrounds with backdrop-filter blur
+- **Animated Gradient Background** - Purple-blue gradient that shifts colors dynamically
+- **CSS Custom Properties** - Centralized theming with CSS variables
+- **Modern Typography** - Inter font family for UI, JetBrains Mono for code
+- **Smooth Animations** - CSS transitions with cubic-bezier easing
+- **Enhanced Hover Effects** - Interactive elements with scale and transform effects
+- **Custom Scrollbars** - Styled scrollbars matching the modern aesthetic
+- **Progress Bars** - Shimmer animations and gradient fills
+
+**Design Features:**
+- Animated gradient background (15-second color shift loop)
+- Glass-effect tabs with blur and semi-transparency
+- Gradient-based buttons with hover/active states
+- Modern card-based dialogs with rounded corners
+- Enhanced typography with gradient text for headings
+- Ripple-like hover effects on interactive elements
+- Theme variables for consistent colors and spacing
+- Shadow effects with proper depth perception
+
+**Technical Implementation:**
+- Created comprehensive `styles-modern.css` file (780+ lines)
+- Google Fonts integration (Inter, JetBrains Mono)
+- CSS Grid and Flexbox for modern layouts
+- backdrop-filter for glassmorphism (with fallbacks)
+- CSS animations with @keyframes
+- RGB/RGBA color system with opacity control
+- CSS custom properties for easy theming
+
+### v1.7.0 PDF Editor & Universal Converter
+
+#### 📄 Comprehensive PDF Editor
+**Complete PDF Manipulation Suite** (`src/main.js:1566-2068`, `src/index.html:552-921`, `src/renderer.js:1951-2429`)
+- **Merge PDFs** - Combine multiple PDF files into a single document
+- **Split PDF** - Split PDFs by page ranges, intervals, or file size
+- **Compress PDF** - Reduce PDF file size with optimization
+- **Rotate Pages** - Rotate specific pages or entire documents (90°, 180°, 270°)
+- **Delete Pages** - Remove unwanted pages from PDFs
+- **Reorder Pages** - Rearrange pages in any order
+- **Add Watermark** - Text watermarks with customizable position, size, color, opacity
+- **Password Protection** - Encrypt PDFs with user and owner passwords
+- **Remove Password** - Decrypt password-protected PDFs
+- **Set Permissions** - Control printing, copying, modifying, and other document permissions
+
+**Technical Implementation:**
+- Uses `pdf-lib` (v1.17.1) for all PDF operations
+- Full async/await implementation for optimal performance
+- Comprehensive error handling and user feedback
+- Progress indicators for long-running operations
+- Page range parsing (e.g., "1-5, 7, 9-12")
+- RGB color conversion for watermarks
+- Support for encrypted PDFs
+
+**Watermark Features:**
+- Multiple positioning options (center, diagonal, corners, top/bottom)
+- Customizable font size (8-144px)
+- Adjustable opacity (0-100%)
+- Color picker for text color
+- Apply to all pages or custom page ranges
+
+**Security Features:**
+- 128-bit and 256-bit encryption support
+- User password (required to open PDF)
+- Owner password (required to modify permissions)
+- Granular permission controls:
+  - Allow/deny printing (high/low resolution)
+  - Allow/deny content modification
+  - Allow/deny content copying
+  - Allow/deny annotations
+  - Allow/deny form filling
+  - Allow/deny accessibility features
+  - Allow/deny document assembly
+  - Allow/deny high-quality printing
+
+#### 🔄 Universal File Converter
+**Open-Source Multi-Tool Converter** (`src/main.js:446-600`, `src/index.html:257-483`, `src/renderer.js:1372-1940`)
+- **LibreOffice** - Document conversions (DOCX, PDF, ODT, RTF, TXT, HTML, XLSX, PPTX)
+- **ImageMagick** - Image format conversions (JPG, PNG, GIF, TIFF, WebP, SVG, etc.)
+- **FFmpeg** - Video and audio conversions (MP4, AVI, MOV, MP3, WAV, etc.)
+- **Pandoc** - Document markup conversions (Markdown, HTML, LaTeX, EPUB, etc.)
+
+**Features:**
+- Single file and batch folder conversion
+- Tool-specific advanced options:
+  - ImageMagick: Quality, DPI, resize, compression type
+  - FFmpeg: Video/audio codecs, bitrate, preset, framerate
+  - LibreOffice: Export quality, page range, bookmarks
+- Automatic tool detection and availability checking
+- Recursive folder processing
+- 100% offline and open-source
+- No API keys required
+
+### v1.6.1 Bug Fixes
+
+#### 🐛 File Association Rendering Fix
+**Fixed Double-Click File Loading** (`src/main.js:1364-1379`)
+- Fixed critical issue where files opened via double-click weren't rendering
+- Added proper wait for renderer load state before sending file data
+- Implemented `did-finish-load` event listener to prevent race conditions
+- Files now render correctly when opened from Windows Explorer
+
+### v1.6.0 Enhanced Markdown Editor & ConvertAPI Integration
+
+#### ✨ Complete Markdown Toolbar
+**Additional Formatting Buttons** (`src/index.html:78-98`, `src/renderer.js:596-723`)
+- **Strikethrough** button - Wraps text with `~~strikethrough~~`
+- **Code Block** button - Inserts fenced code blocks with triple backticks
+- **Horizontal Rule** button - Adds section divider with `---`
+- Complete suite of markdown formatting tools now available
+
+#### 🔍 Fixed Find & Replace
+**Focus and Highlighting Improvements** (`src/renderer.js:725-870`)
+- Fixed focus issue - dialog no longer loses focus while typing
+- Visual highlighting with text selection showing current match
+- Smart auto-scroll to display matches prominently
+- Real-time match counting: "Match X of Y"
+- Replace single match or replace all functionality
+- Enter/Shift+Enter keyboard navigation
+
+#### 📏 Fixed Line Numbers
+**Line Counting and Synchronization** (`src/renderer.js:337-355`)
+- Fixed bug using `'\\n'` instead of `'\n'` for line splitting
+- Added scroll synchronization between line numbers and editor
+- Line numbers update correctly as you type
+- Smooth scrolling keeps line numbers aligned
+
+#### ☁️ ConvertAPI Cloud Integration
+**200+ Format Cloud Conversion** (`src/main.js:370-416`, `src/index.html:257-307`, `src/renderer.js:1540-1603`)
+- New **ConvertAPI menu** with cloud-based file conversion
+- Support for 200+ file formats: MD, DOCX, PDF, HTML, JPG, PNG, EPUB, ODT
+- Secure API key storage in localStorage for reuse
+- Real-time conversion status and progress tracking
+- Free tier: 250 conversions per month
+- Professional conversion dialog with format selection
+- Get API key at: https://www.convertapi.com
+
+**Technical Implementation:**
+- Installed `convertapi` npm package (v1.15.0)
+- IPC handlers for cloud conversion workflow
+- Error handling and user feedback dialogs
+- Async/await pattern for conversion operations
+
+### v1.5.0 Enhanced Features & Open Source Compatibility
+
+#### 🔧 Export Function Fixes & Optional Advanced Options
+**Export Dialog Enhancement** (`src/index.html:125-133`, `src/renderer.js:960-985`)
+- Fixed export function issues after advanced export options integration
+- Added optional advanced export options via checkbox toggle (unchecked by default)
+- Basic export options always visible, advanced options hidden until enabled
+- Clean UI separation between simple and advanced export workflows
+
+#### 🏗️ Open Source Compatibility & Dependency Removal
+**Removed Proprietary Dependencies** (`src/main.js:430-450`, `package.json:32-37`)
+- Removed bundled Pandoc binaries - now requires system-installed Pandoc
+- Replaced proprietary XLSX dependency with open-source CSV export
+- Removed non-essential bundled binaries to ensure open-source compatibility
+- Updated export functions to use system Pandoc installation
+
+#### ✨ Advanced User Experience Features
+**Auto-Save System** (`src/renderer.js:445-484`)
+- Automatic saving every 30 seconds with visual indicators
+- Smooth slide-in animation for auto-save notifications
+- Prevents data loss during extended editing sessions
+- Integrated with file opening and tab creation workflows
+
+**Enhanced Document Statistics** (`src/renderer.js:385-444`)
+- Comprehensive statistics: words, characters, lines, paragraphs, sentences
+- Estimated reading time calculation (200 words per minute)
+- Real-time updates as user types
+- Professional presentation in status bar
+
+**Recent Files Management** (`src/main.js:69-114`, `src/renderer.js:487-512`)
+- Recent files menu with last 10 opened files
+- Persistent storage via localStorage and user data directory
+- Menu integration with File > Recent Files submenu
+- Clear recent files functionality with menu rebuild
+
+**Mathematical Expression Support** (`src/renderer.js:1099-1130`, `src/renderer.js:292-306`)
+- KaTeX integration for rendering mathematical expressions
+- Support for multiple delimiters: $$, $, \\[\\], \\(\\)
+- Real-time math rendering in preview pane
+- Fallback handling for missing KaTeX library
+
+### v1.4.0 Advanced Export & Batch Processing
+
+#### 🔧 Fixed File Association Support
+**File Loading Fix** (`src/main.js:385-390`, `src/renderer.js:485-486`)
+- Fixed timing issue with file association loading
+- Added proper `renderer-ready` event to ensure TabManager is initialized
+- Files now open correctly when double-clicked or opened via right-click menu
+- Command-line file arguments are properly handled on startup
+
+#### 🎛️ Advanced Export Options Dialog
+**Template & Metadata Support** (`src/main.js:247-357`, `src/index.html:117-212`)
+- Comprehensive export options dialog with professional UI
+- Template selection (default or custom template files)
+- Metadata fields (title, author, date, subject) with dynamic field addition
+- Document options: Table of Contents, section numbering, citations
+- PDF-specific options: Engine selection (XeLaTeX, PDFLaTeX, LuaLaTeX), custom margins
+- Bibliography support: .bib, .yaml, .json files with CSL styling
+- All export formats now use enhanced options dialog
+
+#### 📁 Batch File Conversion System
+**Multi-File Processing** (`src/main.js:179-186`, `src/main.js:559-690`)
+- New "Batch" menu for converting entire folders
+- Recursive folder processing with progress tracking
+- Support for all export formats with advanced options
+- Real-time progress bar and file-by-file status updates
+- Maintains folder structure in output directory
+- Error handling with completion statistics
+
+#### 🎨 Enhanced UI Components
+**Dialog System** (`src/styles.css:838-1361`)
+- Professional modal dialogs with backdrop and animations
+- Theme-aware styling for all new components
+- Responsive layouts with proper accessibility
+- Form validation and user feedback systems
+- Progress indicators for long-running operations
+
+### v1.3.x Tabbed Interface & Enhanced Features
+
+#### 🗂️ Tabbed Multi-File Support (v1.3.0)
+**TabManager Class** (`src/renderer.js`)
+- Complete tab management system for multiple files
+- Tab switching, creation, and closure
+- State preservation per tab (content, cursor position, scroll)
+- File path tracking for each tab
+- Keyboard shortcuts: `Ctrl/Cmd+T` (new tab), `Ctrl/Cmd+W` (close tab)
+
+#### 🎯 Enhanced PDF Export (v1.3.0)
+**Multi-Engine Fallback System** (`src/main.js:239-280`)
+- Primary: XeLaTeX with proper margins
+- Fallback 1: PDFLaTeX
+- Fallback 2: wkhtmltopdf
+- Automatic engine detection and switching
+
+#### 📁 File Association Support (v1.3.1)
+**OS Integration** (`src/main.js:452-498`, `package.json:50-65`)
+- Double-click .md files to open in PanConverter
+- Command-line argument handling
+- Pending file queue for startup loading
+
+#### 🎨 Typography & Spacing (v1.3.2-1.3.3)
+**Preview Enhancement** (`src/styles.css`)
+- Restored ideal text spacing from v1.0
+- Font sizes increased to 15px for better readability
+- Comprehensive selector coverage for legacy and new containers
+- Theme-aware typography for all content types
+
+### v1.2.1 Comprehensive Editor Enhancements
+
+#### ✨ Advanced Editor Features
+
+**Find & Replace System** (`src/renderer.js:200-350`)
+- Dialog-based interface with match highlighting
+- Forward/backward navigation through matches
+- Replace single or replace all functionality
+- Real-time match counting and status display
+- Escape key closes dialog
+
+**Line Numbers** (`src/renderer.js:450-500`, `src/styles.css:517-598`)
+- Toggle-able line numbers with toolbar button
+- Synchronized scrolling with editor content
+- Theme-aware styling for all supported themes
+- Dynamic line number generation based on content
+
+**Undo/Redo System** (`src/renderer.js:100-150`)
+- Stack-based state management for editor history
+- Keyboard shortcuts: `Ctrl/Cmd+Z` (undo), `Ctrl/Cmd+Shift+Z` (redo)
+- Intelligent state saving on text changes
+- Memory-efficient history management
+
+**Smart Auto-Indentation** (`src/renderer.js:350-400`)
+- Automatic list continuation on Enter key
+- Proper indentation handling for nested lists
+- Support for ordered and unordered lists
+- Intelligent whitespace management
+
+**Enhanced Keyboard Shortcuts** (`src/renderer.js:400-450`)
+- `Tab`/`Shift+Tab` for line indentation/outdentation
+- `Enter` for auto-continuing lists
+- `Ctrl/Cmd+F` for find & replace dialog
+- `Escape` for closing dialogs
+
+**Word/Character Count** (`src/renderer.js:500-530`)
+- Live counting displayed in status bar
+- Updates automatically as content changes
+- Word and character statistics
+
+#### 📤 Export & Conversion Features
+
+**PowerPoint Export** (`src/main.js:330-350`)
+- Convert markdown to PPTX presentations
+- Automatic slide-level formatting (`--slide-level=2`)
+- Smart presentation structure handling
+
+**Spreadsheet Export** (`src/main.js:370-457`)
+- Export markdown tables to Excel (XLSX/XLS) and ODS formats
+- Multi-table support with separate worksheets
+- Automatic table detection and parsing
+- Error handling for files without tables
+
+**Document Import** (`src/main.js:280-315`)
+- Import DOCX, ODT, RTF, HTML, PDF, PPTX, ODP files
+- Automatic conversion to markdown format
+- File dialog with appropriate filters
+- Success notifications and error handling
+
+**Table Creation Helper** (`src/renderer.js:600-650`)
+- Built-in table generator with row/column specification
+- Automatic markdown table formatting
+- Proper header separation and alignment
+
+#### 🎨 Interface & Theming
+
+**Multi-Theme Support** (`src/styles.css:214-598`)
+- Light, Dark, Solarized, Monokai, GitHub themes
+- Complete theming for all UI components
+- Theme-aware styling for new features (find dialog, line numbers)
+- Persistent theme selection with local storage
+
+**Enhanced UI Components** (`src/index.html:94-108`)
+- Find & replace dialog with modern styling
+- Toolbar buttons for all new features
+- Status bar with live statistics
+- Responsive layout with proper spacing
+
+## File Structure & Key Components
 
 ### Main Process (`src/main.js`)
-- Manages application lifecycle
+- **Menu System**: Comprehensive menu with file operations, editing, conversion, view options, batch processing
-- Creates and manages windows
+- **IPC Handlers**: Communication between main and renderer processes
-- Handles file operations
+- **File Operations**: Open, save, import/export functionality with file association support
-- Manages menu bar
+- **Export System**: Advanced export with templates, metadata, and Pandoc integration
-- Communicates with renderer via IPC
+- **Batch Processing**: Multi-file conversion with progress tracking and error handling
+- **Theme Management**: Persistent theme storage and application
+- **Spreadsheet Export**: Table extraction and XLSX generation
+- **About Dialog**: Application information and feature list
 
 ### Renderer Process (`src/renderer.js`)
-- Handles UI interactions
+- **Editor Initialization**: CodeMirror-like functionality with custom implementation
-- Manages editor state
+- **TabManager System**: Multi-file editing with state management
-- Renders markdown preview
+- **Find & Replace Engine**: Search algorithms with regex support
-- Handles theme switching
+- **Undo/Redo Manager**: History stack management
-- Communicates with main process via IPC
+- **Auto-indentation Logic**: Smart list continuation
+- **Live Preview**: Real-time markdown rendering with DOMPurify
+- **Export Dialog Management**: Advanced options collection and validation
+- **Batch Conversion Interface**: Folder selection, progress tracking, and user feedback
+- **Event Handling**: Keyboard shortcuts and UI interactions
+- **Statistics Tracking**: Word/character counting
 
-### Key Libraries
+### Styling (`src/styles.css`)
-- **Electron**: Desktop application framework
+- **Base Styles**: Application layout and typography
-- **marked**: Markdown parsing
+- **Component Styles**: Toolbar, editor, preview, dialogs
-- **highlight.js**: Syntax highlighting
+- **Theme Implementations**: Complete styling for all themes
-- **DOMPurify**: HTML sanitization
+- **Responsive Design**: Flexible layouts and proper spacing
-- **electron-store**: Persistent storage
+- **Animation Support**: Smooth transitions and hover effects
-- **electron-builder**: Application packaging
 
-## Features Implementation
+### HTML Structure (`src/index.html`)
+- **Toolbar**: Feature buttons with SVG icons
+- **Tab Bar**: Multi-file navigation with close buttons
+- **Find Dialog**: Search and replace interface
+- **Export Options Dialog**: Advanced export configuration with templates and metadata
+- **Batch Conversion Dialog**: Folder selection and conversion progress
+- **Editor Container**: Line numbers and text editor with tab content management
+- **Preview Pane**: Rendered markdown display
+- **Status Bar**: Statistics and application status
 
-### Markdown Editor
+## Testing & Quality Assurance
-- Uses native textarea with custom styling
-- Supports common markdown shortcuts via toolbar
-- Tab key inserts 4 spaces for code indentation
-- Auto-save every 30 seconds when content changes
 
-### Live Preview
+### Manual Testing Checklist
-- Updates in real-time as you type
+- [ ] All keyboard shortcuts work correctly
-- Sanitized HTML output for security
+- [ ] Find & replace functions properly with edge cases
-- Syntax highlighting for code blocks
+- [ ] Line numbers sync correctly with content
-- GitHub-flavored markdown support
+- [ ] Undo/redo preserves cursor position
+- [ ] Auto-indentation works with various list types
+- [ ] File association loading (double-click .md files)
+- [ ] Export options dialog with templates and metadata
+- [ ] Batch conversion with progress tracking
+- [ ] All themes render correctly for new components
+- [ ] Export functions work with various document formats
+- [ ] Table creation and export functionality
+- [ ] Cross-platform compatibility
 
-### Theme System
+### Known Issues & Limitations
-- Themes stored in user preferences
+- AppImage may require `--no-sandbox` flag on some Linux systems
-- Applied via CSS classes on body element
+- Large files (>1MB) may cause performance issues
-- Persists across application restarts
+- Windows/Mac builds require platform-specific environments
-- Five built-in themes
+- Pandoc must be installed separately for export functionality
 
-### Export System
+## Deployment & Distribution
-- Uses Pandoc command-line tool
-- Supports multiple output formats
-- Maintains original file structure
-- Shows error messages if Pandoc not installed
 
-## Platform-Specific Branches
+### Release Packages
+- **Linux AppImage**: Universal Linux package (self-contained)
+- **Debian Package**: `.deb` for Ubuntu/Debian systems
+- **Snap Package**: Universal Linux package via Snap Store
+- **Future**: Windows `.exe` and macOS `.dmg` packages
 
-The repository maintains separate branches for platform-specific customizations:
+### Release Process
-- `master`: Main development branch
+1. Update version in `package.json`, `src/main.js`, and `README.md`
-- `linux`: Linux-specific configurations
+2. Commit changes and push to all platform branches
-- `macos`: macOS-specific configurations  
+3. Build platform-specific packages
-- `windows`: Windows-specific configurations
+4. Create Git tag and GitHub release
+5. Upload packages to GitHub release
+6. Update documentation and announce release
 
-## Debian Package
+## Contributing Guidelines
 
-The application can be built as a `.deb` package for Debian-based systems:
+### Code Style
-```bash
+- Use consistent indentation (2 spaces)
-npm run build:linux
+- Follow JavaScript ES6+ standards
-```
+- Comment complex functionality
+- Maintain separation between main and renderer processes
+- Use descriptive variable and function names
 
-The generated `.deb` file will:
+### Adding New Features
-- Install to `/opt/pan-converter`
+1. Plan feature implementation and UI integration
-- Create desktop entry for application menu
+2. Update relevant files (main.js, renderer.js, styles.css)
-- Set up proper file associations
+3. Test across all supported themes
-- Declare Pandoc as dependency
+4. Update documentation and README
+5. Test on multiple platforms if possible
+6. Submit pull request with detailed description
 
-## Testing
+### Bug Reporting
+- Include steps to reproduce
+- Specify platform and version information
+- Attach relevant screenshots or error logs
+- Check existing issues before creating new ones
 
-### Manual Testing
+## Future Roadmap
-1. File Operations: New, Open, Save, Save As
-2. Editor Features: Bold, Italic, Headings, Links, Code, Lists, Quotes
-3. Preview Toggle: Show/hide preview pane
-4. Theme Switching: Test all five themes
-5. Export Functions: Test each export format
-6. Auto-save: Verify 30-second auto-save works
 
-### Platform Testing
+### Planned Features
-Test on:
+- [ ] Collaborative editing capabilities
-- Windows 10/11
+- [ ] Plugin system for extensions
-- macOS 11+ (Big Sur and later)
+- [ ] Advanced markdown extensions (math, diagrams)
-- Ubuntu 20.04+, Debian 11+
+- [ ] Cloud synchronization options
+- [ ] Mobile companion app
+- [ ] Advanced export templates
+- [ ] Spell check and grammar checking
+- [ ] Version control integration
 
-## Known Issues
+### Technical Improvements
-- ICO and ICNS icons need manual conversion from PNG
+- [ ] Performance optimization for large files
-- Pandoc must be installed separately
+- [ ] Memory usage optimization
-- Large files may cause performance issues
+- [ ] Startup time improvements
+- [ ] Better error handling and user feedback
+- [ ] Automated testing suite
+- [ ] Continuous integration/deployment
 
-## Future Enhancements
+---
-- [ ] Add spell checking
-- [ ] Implement find and replace
-- [ ] Add custom CSS for preview
-- [ ] Support for markdown extensions
-- [ ] Plugin system for custom exporters
-- [ ] Cloud sync capabilities
-- [ ] Collaborative editing
 
-## License
+**Last Updated**: October 11, 2025
-MIT License
+**Claude Assistant**: Development completed for v1.7.2 with 14 new professionally-designed themes (Dracula, Nord, Tokyo Night, Gruvbox, Ayu, Material, Oceanic Next, Palenight, Cobalt2, and more) bringing total to 19 themes, plus fixed undo/redo menu integration for proper keyboard shortcut support.
-
-## Support
-For issues or feature requests, please open an issue on the GitHub repository.

EXPORT_FIX_SUMMARY.md

@@ -0,0 +1,103 @@
+# Export Functionality Fix - Summary
+
+## Issues Found and Fixed
+
+### 1. **Primary Issue: Pandoc Installation Problem**
+- **Problem**: Pandoc is installed but has a system error (paging file too small)
+- **Impact**: All pandoc-dependent exports (DOCX, LaTeX, etc.) were failing
+- **Solution**: Added robust fallback mechanisms
+
+### 2. **Export Function Improvements**
+
+#### Before (Issues):
+- ❌ No pandoc availability checking
+- ❌ Poor error messages
+- ❌ No fallback for missing pandoc
+- ❌ Limited debugging information
+
+#### After (Fixed):
+- ✅ **Pandoc Detection**: Automatically checks if pandoc is available
+- ✅ **Built-in HTML Export**: Works without pandoc using marked library
+- ✅ **Built-in PDF Export**: Works without pandoc using Electron's printToPDF
+- ✅ **Better Error Messages**: Clear instructions for users
+- ✅ **Comprehensive Logging**: Debug information in console
+- ✅ **Graceful Fallbacks**: Falls back to built-in converters when pandoc fails
+
+## How It Works Now
+
+### Export Process Flow:
+1. **User clicks export** → Check if file is saved
+2. **Select output location** → Show save dialog
+3. **Check pandoc availability** → Async pandoc detection
+4. **Choose export method**:
+   - **If pandoc available**: Use pandoc with format-specific options
+   - **If pandoc not available**: 
+     - HTML → Use built-in marked converter
+     - PDF → Use Electron's printToPDF
+     - Other formats → Show helpful error with installation guide
+
+### Supported Export Formats:
+
+#### ✅ **Always Work** (no pandoc required):
+- **HTML**: Built-in converter using marked library
+- **PDF**: Built-in converter using Electron
+
+#### ✅ **Work with Pandoc** (better quality):
+- **DOCX**: Microsoft Word format
+- **LaTeX**: LaTeX document
+- **RTF**: Rich Text Format  
+- **ODT**: OpenDocument Text
+- **EPUB**: E-book format
+- **PPTX**: PowerPoint presentations
+- **ODP**: OpenDocument Presentations
+
+## Testing the Fixes
+
+### Manual Test Procedure:
+1. **Start the application**: `npm start`
+2. **Open test file**: Load `test-export.md`
+3. **Test HTML export**: File → Export → HTML (should work)
+4. **Test PDF export**: File → Export → PDF (should work)
+5. **Test DOCX export**: File → Export → DOCX (will show pandoc error)
+
+### Expected Behavior:
+- **HTML/PDF exports**: Should work immediately and create files
+- **Other format exports**: Should show informative error about pandoc
+- **Console logs**: Should show debug information about export process
+
+## Fix Summary
+
+### Code Changes Made:
+1. **Added `checkPandocAvailability()` function** - Detects pandoc
+2. **Added `exportToHTML()` function** - Built-in HTML export
+3. **Added `exportToPDFElectron()` function** - Built-in PDF export
+4. **Added `exportWithPandoc()` helper** - Generic pandoc export
+5. **Added `exportWithPandocPDF()` helper** - PDF with fallbacks
+6. **Improved `exportFile()` function** - Main export logic with detection
+7. **Enhanced error handling** - Better user messages
+8. **Added comprehensive logging** - Debug information
+
+### Files Modified:
+- `src/main.js` - Enhanced export functionality
+- `test-export.md` - Created test file
+- `test-export-functionality.js` - Created test script
+
+## User Instructions
+
+### For Users Without Pandoc:
+- ✅ **HTML and PDF exports work perfectly**
+- ✅ **No additional software needed**
+- ✅ **Professional-looking output with proper styling**
+
+### For Users Who Want All Formats:
+1. **Install Pandoc**: Visit https://pandoc.org/installing.html
+2. **For PDF with LaTeX**: Also install MiKTeX or TeX Live
+3. **Restart the application** after installation
+4. **All export formats will then be available**
+
+## Result
+🎉 **Export functionality is now working reliably!**
+- Built-in exports (HTML, PDF) work without any dependencies
+- Clear error messages guide users for advanced formats
+- Robust error handling prevents crashes
+- Better user experience with informative dialogs

GEMINI.md

@@ -0,0 +1,82 @@
+# GEMINI.md
+
+## Project Overview
+
+This project is a cross-platform Markdown editor and converter named **PanConverter**. It is built using the Electron framework, allowing it to run on Windows, macOS, and Linux. The application provides a rich text editor for writing Markdown, a live preview pane, and robust export capabilities powered by Pandoc.
+
+The core technologies used are:
+- **Electron:** For creating the desktop application.
+- **JavaScript:** The primary programming language.
+- **Pandoc:** For converting Markdown to various formats like PDF, DOCX, HTML, etc.
+- **Marked:** For parsing and rendering the Markdown preview in real-time.
+- **CodeMirror:** As the underlying text editor component.
+- **highlight.js:** For syntax highlighting in the editor.
+- **DOMPurify:** To sanitize the HTML output in the preview pane for security.
+
+The application features a tabbed interface for working with multiple files, various themes, find and replace functionality, and detailed document statistics.
+
+## Building and Running
+
+To build and run this project locally, you will need to have Node.js and npm installed.
+
+### Installation
+
+1.  **Clone the repository:**
+    ```bash
+    git clone https://github.com/amitwh/pan-converter.git
+    cd pan-converter
+    ```
+
+2.  **Install dependencies:**
+    ```bash
+    npm install
+    ```
+
+### Running the Application
+
+To run the application in development mode, use the following command:
+
+```bash
+npm start
+```
+
+### Building the Application
+
+You can build the application for different platforms using the scripts defined in `package.json`.
+
+-   **Build for the current platform:**
+    ```bash
+    npm run build
+    ```
+
+-   **Build for a specific platform:**
+    ```bash
+    npm run build:win    # For Windows
+    npm run build:mac    # For macOS
+    npm run build:linux  # For Linux
+    ```
+
+-   **Build for all platforms at once:**
+    ```bash
+    npm run dist:all
+    ```
+
+The distributable files will be located in the `dist/` directory.
+
+### Testing
+
+The project does not have a dedicated test suite configured. The `test` script in `package.json` currently returns an error.
+
+```bash
+npm test
+```
+
+## Development Conventions
+
+-   **Code Style:** The codebase is written in JavaScript (ES6+). There is no linter or formatter configured, but the code generally follows standard JavaScript conventions.
+-   **Main vs. Renderer Process:** The application logic is split between the Electron main process (`src/main.js`) and the renderer process (`src/renderer.js`).
+    -   `src/main.js` handles window management, application menus, file system operations, and communication with the operating system.
+    -   `src/renderer.js` manages the user interface, editor functionality, and the Markdown preview.
+-   **Dependencies:** Project dependencies are managed through `package.json`. `devDependencies` are used for the build process, while `dependencies` are required for the application to run.
+-   **User Data:** The application stores settings and recent files in the user's application data directory.
+-   **Pandoc Integration:** The application relies on a system-installed version of Pandoc for its export functionality. It does not bundle Pandoc.

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Amit Haridas
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.latex

@@ -0,0 +1,378 @@
+\hypertarget{panconverter}{%
+\section{PanConverter}\label{panconverter}}
+
+A cross-platform Markdown editor and converter powered by Pandoc.
+
+\begin{figure}
+\centering
+\includegraphics{assets/icon.png}
+\caption{PanConverter}
+\end{figure}
+
+\hypertarget{features}{%
+\subsection{Features}\label{features}}
+
+\hypertarget{advanced-markdown-editor}{%
+\subsubsection{✨ Advanced Markdown
+Editor}\label{advanced-markdown-editor}}
+
+\begin{itemize}
+\tightlist
+\item
+  🗂️ \textbf{Tabbed Interface} - Work with multiple files simultaneously
+  in separate tabs
+\item
+  📝 \textbf{Rich Text Editor} - Full-featured editor with syntax
+  highlighting and comprehensive toolbar
+\item
+  🔍 \textbf{Find \& Replace} - Powerful search and replace with match
+  highlighting and navigation
+\item
+  🔢 \textbf{Line Numbers} - Toggle line numbers for easier code editing
+  and navigation
+\item
+  ↩️ \textbf{Smart Auto-Indentation} - Automatic list continuation and
+  intelligent indentation
+\item
+  ⏪ \textbf{Undo/Redo} - Full undo/redo support with keyboard shortcuts
+\item
+  ⌨️ \textbf{Advanced Shortcuts} - Tab indentation, line selection, and
+  smart text formatting
+\item
+  📂 \textbf{File Association Support} - Open markdown files directly
+  from file manager
+\end{itemize}
+
+\hypertarget{themes-interface}{%
+\subsubsection{🎨 Themes \& Interface}\label{themes-interface}}
+
+\begin{itemize}
+\tightlist
+\item
+  👁️ \textbf{Live Preview} - See your markdown rendered in real-time
+  with synchronized scrolling
+\item
+  🎨 \textbf{Multiple Themes} - Choose from Light, Dark, Solarized,
+  Monokai, or GitHub themes
+\item
+  💾 \textbf{Auto-Save} - Never lose your work with automatic saving
+  every 30 seconds
+\end{itemize}
+
+\hypertarget{export-conversion}{%
+\subsubsection{📤 Export \& Conversion}\label{export-conversion}}
+
+\begin{itemize}
+\tightlist
+\item
+  📄 \textbf{Enhanced PDF Export} - Robust PDF generation with multiple
+  LaTeX engine fallbacks (XeLaTeX, PDFLaTeX, wkhtmltopdf)
+\item
+  📄 \textbf{Document Export} - Convert to HTML, DOCX, LaTeX, RTF, ODT,
+  EPUB, PowerPoint (PPTX), and OpenDocument Presentation (ODP)
+\item
+  📊 \textbf{Spreadsheet Export} - Export markdown tables to Excel
+  (XLSX/XLS) and OpenDocument Spreadsheet (ODS) formats
+\item
+  📥 \textbf{Document Import} - Import DOCX, ODT, RTF, HTML, PDF, and
+  presentation files to markdown
+\item
+  📋 \textbf{Table Creation Helper} - Built-in table generator for easy
+  markdown table creation
+\end{itemize}
+
+\hypertarget{platform-support}{%
+\subsubsection{🖥️ Platform Support}\label{platform-support}}
+
+\begin{itemize}
+\tightlist
+\item
+  \textbf{Cross-Platform} - Works seamlessly on Windows, macOS, and
+  Linux
+\end{itemize}
+
+\hypertarget{installation}{%
+\subsection{Installation}\label{installation}}
+
+\hypertarget{prerequisites}{%
+\subsubsection{Prerequisites}\label{prerequisites}}
+
+\begin{itemize}
+\tightlist
+\item
+  \href{https://pandoc.org/installing.html}{Pandoc} must be installed
+  for export functionality
+
+  \begin{itemize}
+  \tightlist
+  \item
+    \textbf{Ubuntu/Debian}: \texttt{sudo\ apt-get\ install\ pandoc}
+  \item
+    \textbf{macOS}: \texttt{brew\ install\ pandoc}
+  \item
+    \textbf{Windows}: Download installer from Pandoc website
+  \end{itemize}
+\end{itemize}
+
+\hypertarget{pdf-export-requirements}{%
+\subsubsection{PDF Export Requirements}\label{pdf-export-requirements}}
+
+For optimal PDF export, install a LaTeX engine (recommended): -
+\textbf{Ubuntu/Debian}:
+\texttt{sudo\ apt-get\ install\ texlive-xetex\ texlive-latex-base} -
+\textbf{macOS}: \texttt{brew\ install\ -\/-cask\ mactex} -
+\textbf{Windows}: Install MiKTeX or TeX Live - \textbf{Alternative}:
+\texttt{sudo\ apt-get\ install\ wkhtmltopdf} (fallback option)
+
+\hypertarget{download}{%
+\subsubsection{Download}\label{download}}
+
+Download the latest release for your platform from the
+\href{https://github.com/amitwh/pan-converter/releases}{Releases} page.
+
+\hypertarget{linux}{%
+\paragraph{Linux}\label{linux}}
+
+\begin{itemize}
+\tightlist
+\item
+  \textbf{AppImage}: \texttt{PanConverter-1.3.1.AppImage} (universal,
+  may require \texttt{-\/-no-sandbox} flag)
+\item
+  \textbf{Debian Package}: \texttt{pan-converter\_1.3.1\_amd64.deb}
+\item
+  \textbf{Snap Package}: \texttt{pan-converter\_1.3.1\_amd64.snap}
+\end{itemize}
+
+\hypertarget{install-from-source}{%
+\subsubsection{Install from Source}\label{install-from-source}}
+
+\begin{Shaded}
+\begin{Highlighting}[]
+\FunctionTok{git}\NormalTok{ clone https://github.com/amitwh/pan{-}converter.git}
+\BuiltInTok{cd}\NormalTok{ pan{-}converter}
+\ExtensionTok{npm}\NormalTok{ install}
+\ExtensionTok{npm}\NormalTok{ start}
+\end{Highlighting}
+\end{Shaded}
+
+\hypertarget{usage}{%
+\subsection{Usage}\label{usage}}
+
+\hypertarget{basic-workflow}{%
+\subsubsection{Basic Workflow}\label{basic-workflow}}
+
+\begin{enumerate}
+\def\labelenumi{\arabic{enumi}.}
+\tightlist
+\item
+  \textbf{Write} - Use the editor to write your Markdown content
+\item
+  \textbf{Preview} - Toggle the preview pane to see rendered output
+\item
+  \textbf{Theme} - Choose your preferred theme from the View menu
+\item
+  \textbf{Export} - Export your document to various formats
+\end{enumerate}
+
+\hypertarget{export-options}{%
+\subsubsection{Export Options}\label{export-options}}
+
+\begin{itemize}
+\tightlist
+\item
+  \textbf{Documents}: HTML, PDF, DOCX, LaTeX, RTF, ODT, EPUB
+\item
+  \textbf{Presentations}: PowerPoint (PPTX), OpenDocument Presentation
+  (ODP)
+\item
+  \textbf{Spreadsheets}: Excel (XLSX/XLS), OpenDocument Spreadsheet
+  (ODS)
+\end{itemize}
+
+\hypertarget{import-conversion}{%
+\subsubsection{Import \& Conversion}\label{import-conversion}}
+
+\begin{itemize}
+\tightlist
+\item
+  \textbf{Import Documents}: Convert DOCX, ODT, RTF, HTML, PDF, and
+  presentation files to Markdown
+\item
+  \textbf{Cross-Format Conversion}: Convert current file between
+  multiple formats
+\item
+  \textbf{Smart Presentation Handling}: Automatic slide-level formatting
+  for PPTX/ODP exports
+\end{itemize}
+
+\hypertarget{table-creation}{%
+\subsubsection{Table Creation}\label{table-creation}}
+
+\begin{itemize}
+\tightlist
+\item
+  Click the table button in the toolbar
+\item
+  Specify number of rows and columns
+\item
+  Automatically generates properly formatted Markdown tables
+\end{itemize}
+
+\hypertarget{keyboard-shortcuts}{%
+\subsection{Keyboard Shortcuts}\label{keyboard-shortcuts}}
+
+\hypertarget{file-operations}{%
+\subsubsection{File Operations}\label{file-operations}}
+
+\begin{itemize}
+\tightlist
+\item
+  \texttt{Ctrl/Cmd\ +\ N} - New file/tab
+\item
+  \texttt{Ctrl/Cmd\ +\ T} - New tab
+\item
+  \texttt{Ctrl/Cmd\ +\ W} - Close current tab
+\item
+  \texttt{Ctrl/Cmd\ +\ Tab} - Switch to next tab
+\item
+  \texttt{Ctrl/Cmd\ +\ O} - Open file
+\item
+  \texttt{Ctrl/Cmd\ +\ S} - Save file
+\item
+  \texttt{Ctrl/Cmd\ +\ Shift\ +\ S} - Save as
+\item
+  \texttt{Ctrl/Cmd\ +\ I} - Import document
+\end{itemize}
+
+\hypertarget{editor-features}{%
+\subsubsection{Editor Features}\label{editor-features}}
+
+\begin{itemize}
+\tightlist
+\item
+  \texttt{Ctrl/Cmd\ +\ F} - Find \& Replace
+\item
+  \texttt{Ctrl/Cmd\ +\ Z} - Undo
+\item
+  \texttt{Ctrl/Cmd\ +\ Shift\ +\ Z} - Redo
+\item
+  \texttt{Tab} - Indent lines or insert 4 spaces
+\item
+  \texttt{Shift\ +\ Tab} - Outdent selected lines
+\item
+  \texttt{Enter} - Auto-continue lists with proper indentation
+\end{itemize}
+
+\hypertarget{view-navigation}{%
+\subsubsection{View \& Navigation}\label{view-navigation}}
+
+\begin{itemize}
+\tightlist
+\item
+  \texttt{Ctrl/Cmd\ +\ P} - Toggle preview
+\item
+  \texttt{Ctrl/Cmd\ +\ Enter} - Toggle preview (alternative)
+\item
+  \texttt{Escape} - Close find dialog
+\end{itemize}
+
+\hypertarget{building}{%
+\subsection{Building}\label{building}}
+
+\begin{Shaded}
+\begin{Highlighting}[]
+\CommentTok{\# Install dependencies}
+\ExtensionTok{npm}\NormalTok{ install}
+
+\CommentTok{\# Generate icons}
+\ExtensionTok{npm}\NormalTok{ run generate{-}icons}
+
+\CommentTok{\# Build for current platform}
+\ExtensionTok{npm}\NormalTok{ run build}
+
+\CommentTok{\# Build for specific platform}
+\ExtensionTok{npm}\NormalTok{ run build:win    }\CommentTok{\# Windows}
+\ExtensionTok{npm}\NormalTok{ run build:mac    }\CommentTok{\# macOS  }
+\ExtensionTok{npm}\NormalTok{ run build:linux  }\CommentTok{\# Linux (generates .deb, .AppImage, and .snap)}
+
+\CommentTok{\# Build for all platforms}
+\ExtensionTok{npm}\NormalTok{ run dist:all}
+\end{Highlighting}
+\end{Shaded}
+
+\hypertarget{version-history}{%
+\subsection{Version History}\label{version-history}}
+
+\begin{itemize}
+\tightlist
+\item
+  \textbf{v1.3.1} - Bug fixes: Fixed file associations for
+  double-clicking .md files, corrected 50/50 layout alignment for
+  editor/preview panes
+\item
+  \textbf{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
+\item
+  \textbf{v1.2.1} - Comprehensive editor enhancements: Find \& Replace,
+  Line Numbers, Undo/Redo, Auto-indentation, PowerPoint export, document
+  conversion menu, table creation helper, spreadsheet export
+\item
+  \textbf{v1.1.0} - Added Excel/ODS spreadsheet export, updated author
+  information, renamed to PanConverter
+\item
+  \textbf{v1.0.0} - Initial release with basic markdown editing, themes,
+  and Pandoc export
+\end{itemize}
+
+\hypertarget{known-issues}{%
+\subsection{Known Issues}\label{known-issues}}
+
+\begin{itemize}
+\tightlist
+\item
+  AppImage may require \texttt{-\/-no-sandbox} flag on some Linux
+  systems
+\item
+  Windows/Mac builds require platform-specific build environments
+\item
+  Large files may cause performance issues
+\end{itemize}
+
+\hypertarget{contributing}{%
+\subsection{Contributing}\label{contributing}}
+
+Contributions are welcome! Please feel free to submit a Pull Request to
+the \href{https://github.com/amitwh/pan-converter}{GitHub repository}.
+
+\hypertarget{license}{%
+\subsection{License}\label{license}}
+
+MIT License - see LICENSE file for details.
+
+\hypertarget{author}{%
+\subsection{Author}\label{author}}
+
+\textbf{Amit Haridas} -
+\href{mailto:amit.wh@gmail.com}{\nolinkurl{amit.wh@gmail.com}}
+
+\hypertarget{acknowledgments}{%
+\subsection{Acknowledgments}\label{acknowledgments}}
+
+\begin{itemize}
+\tightlist
+\item
+  Built with \href{https://www.electronjs.org/}{Electron}
+\item
+  Markdown parsing by \href{https://marked.js.org/}{marked}
+\item
+  Export functionality powered by \href{https://pandoc.org/}{Pandoc}
+\item
+  Syntax highlighting by \href{https://highlightjs.org/}{highlight.js}
+\item
+  Spreadsheet export by \href{https://www.npmjs.com/package/xlsx}{XLSX}
+\item
+  HTML sanitization by
+  \href{https://www.npmjs.com/package/dompurify}{DOMPurify}
+\end{itemize}

README.md

@@ -6,24 +6,60 @@ A cross-platform Markdown editor and converter powered by Pandoc.
 
 ## Features
 
-- 📝 **Rich Markdown Editor** - Full-featured editor with syntax highlighting
+### ✨ Advanced Markdown Editor
-- 👁️ **Live Preview** - See your markdown rendered in real-time
+- 🗂️ **Tabbed Interface** - Work with multiple files simultaneously in separate tabs
+- 📝 **Rich Text Editor** - Full-featured editor with syntax highlighting and comprehensive toolbar
+- 🔍 **Find & Replace** - Powerful search and replace with match highlighting and navigation
+- 🔢 **Line Numbers** - Toggle line numbers for easier code editing and navigation
+- ↩️ **Smart Auto-Indentation** - Automatic list continuation and intelligent indentation
+- ⏪ **Undo/Redo** - Full undo/redo support with keyboard shortcuts
+- ⌨️ **Advanced Shortcuts** - Tab indentation, line selection, and smart text formatting
+- 📂 **File Association Support** - Open markdown files directly from file manager
+
+### 🎨 Themes & Interface
+- 👁️ **Live Preview** - See your markdown rendered in real-time with synchronized scrolling
 - 🎨 **Multiple Themes** - Choose from Light, Dark, Solarized, Monokai, or GitHub themes
-- 📤 **Export to Multiple Formats** - Convert to HTML, PDF, DOCX, LaTeX, RTF, ODT, and EPUB
+- 💾 **Auto-Save** - Never lose your work with automatic saving every 30 seconds
-- 💾 **Auto-Save** - Never lose your work with automatic saving
+- 📊 **Enhanced Statistics** - Detailed document statistics including word count, character count, lines, paragraphs, sentences, and estimated reading time
-- 🖥️ **Cross-Platform** - Works on Windows, macOS, and Linux
+- 🕒 **Recent Files** - Quick access to recently opened files via File menu
+- 🧮 **Math Support** - Render mathematical expressions using KaTeX (supports $$, $, \\[\\], \\(\\) delimiters)
+
+### 📤 Export & Conversion
+- 📄 **Enhanced PDF Export** - Robust PDF generation with multiple LaTeX engine fallbacks (XeLaTeX, PDFLaTeX, wkhtmltopdf)
+- 📄 **Document Export** - Convert to HTML, DOCX, LaTeX, RTF, ODT, EPUB, PowerPoint (PPTX), and OpenDocument Presentation (ODP)
+- 📊 **Spreadsheet Export** - Export markdown tables to CSV format for compatibility with any spreadsheet application
+- 📥 **Document Import** - Import DOCX, ODT, RTF, HTML, PDF, and presentation files to markdown
+- 📋 **Table Creation Helper** - Built-in table generator for easy markdown table creation
+
+### 🖥️ Platform Support
+- **Cross-Platform** - Works seamlessly on Windows, macOS, and Linux
 
 ## Installation
 
 ### Prerequisites
 - [Pandoc](https://pandoc.org/installing.html) must be installed for export functionality
+  - **Ubuntu/Debian**: `sudo apt-get install pandoc`
+  - **macOS**: `brew install pandoc`
+  - **Windows**: Download installer from Pandoc website
+
+### PDF Export Requirements
+For optimal PDF export, install a LaTeX engine (recommended):
+- **Ubuntu/Debian**: `sudo apt-get install texlive-xetex texlive-latex-base`
+- **macOS**: `brew install --cask mactex`
+- **Windows**: Install MiKTeX or TeX Live
+- **Alternative**: `sudo apt-get install wkhtmltopdf` (fallback option)
 
 ### Download
-Download the latest release for your platform from the [Releases](https://github.com/yourusername/pan-converter/releases) page.
+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/yourusername/pan-converter.git
+git clone https://github.com/amitwh/pan-converter.git
 cd pan-converter
 npm install
 npm start
@@ -31,45 +67,108 @@ npm start
 
 ## Usage
 
+### Basic Workflow
 1. **Write** - Use the editor to write your Markdown content
 2. **Preview** - Toggle the preview pane to see rendered output
 3. **Theme** - Choose your preferred theme from the View menu
-4. **Export** - Export your document to various formats via File > Export
+4. **Export** - Export your document to various formats
+
+### Export Options
+- **Documents**: HTML, PDF, DOCX, LaTeX, RTF, ODT, EPUB
+- **Presentations**: PowerPoint (PPTX), OpenDocument Presentation (ODP)
+- **Spreadsheets**: CSV format for tables (compatible with Excel, LibreOffice, Google Sheets)
+- **Advanced Export Options**: Optional template support, metadata insertion, table of contents, section numbering, and PDF-specific settings
+- **Batch Conversion**: Convert entire folders of markdown files with progress tracking
+
+### Import & Conversion
+- **Import Documents**: Convert DOCX, ODT, RTF, HTML, PDF, and presentation files to Markdown
+- **Cross-Format Conversion**: Convert current file between multiple formats
+- **Smart Presentation Handling**: Automatic slide-level formatting for PPTX/ODP exports
+
+### Table Creation
+- Click the table button in the toolbar
+- Specify number of rows and columns
+- Automatically generates properly formatted Markdown tables
 
 ## Keyboard Shortcuts
 
-- `Ctrl/Cmd + N` - New file
+### File Operations
+- `Ctrl/Cmd + N` - New file/tab
+- `Ctrl/Cmd + T` - New tab
+- `Ctrl/Cmd + W` - Close current tab
+- `Ctrl/Cmd + Tab` - Switch to next tab
 - `Ctrl/Cmd + O` - Open file
 - `Ctrl/Cmd + S` - Save file
 - `Ctrl/Cmd + Shift + S` - Save as
+- `Ctrl/Cmd + I` - Import document
+
+### Editor Features
+- `Ctrl/Cmd + F` - Find & Replace
+- `Ctrl/Cmd + Z` - Undo
+- `Ctrl/Cmd + Shift + Z` - Redo
+- `Tab` - Indent lines or insert 4 spaces
+- `Shift + Tab` - Outdent selected lines
+- `Enter` - Auto-continue lists with proper indentation
+
+### View & Navigation
 - `Ctrl/Cmd + P` - Toggle preview
 - `Ctrl/Cmd + Enter` - Toggle preview (alternative)
+- `Escape` - Close find dialog
 
 ## Building
 
 ```bash
+# Install dependencies
+npm install
+
+# Generate icons
+npm run generate-icons
+
 # Build for current platform
 npm run build
 
 # Build for specific platform
-npm run build:win
+npm run build:win    # Windows
-npm run build:mac
+npm run build:mac    # macOS  
-npm run build:linux
+npm run build:linux  # Linux (generates .deb, .AppImage, and .snap)
 
 # Build for all platforms
 npm run dist:all
 ```
 
+## Version History
+
+- **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.
+Contributions are welcome! Please feel free to submit a Pull Request to the [GitHub repository](https://github.com/amitwh/pan-converter).
 
 ## License
 
-MIT License - see LICENSE file for details
+MIT License - see LICENSE file for details.
+
+## Author
+
+**Amit Haridas** - [amit.wh@gmail.com](mailto:amit.wh@gmail.com)
 
 ## Acknowledgments
 
 - Built with [Electron](https://www.electronjs.org/)
 - Markdown parsing by [marked](https://marked.js.org/)
 - Export functionality powered by [Pandoc](https://pandoc.org/)
+- Syntax highlighting by [highlight.js](https://highlightjs.org/)
+- Spreadsheet export by [XLSX](https://www.npmjs.com/package/xlsx)
+- HTML sanitization by [DOMPurify](https://www.npmjs.com/package/dompurify)

package.json

@@ -1,23 +1,30 @@
 {
   "name": "pan-converter",
-  "version": "1.0.0",
+  "version": "1.7.3",
   "description": "Cross-platform Markdown editor and converter using Pandoc",
   "main": "src/main.js",
   "scripts": {
     "start": "electron .",
     "test": "echo \"Error: no test specified\" && exit 1",
     "build": "electron-builder",
-    "build:win": "electron-builder --win",
+    "build:win": "cross-env CSC_LINK=code-signing-cert.pfx CSC_KEY_PASSWORD=PanConverter2024! 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",
     "dist": "electron-builder --publish=never",
     "dist:all": "electron-builder -mwl",
     "generate-icons": "node scripts/generate-icons.js"
   },
-  "keywords": ["markdown", "pandoc", "converter", "editor"],
+  "keywords": [
-  "author": "Your Name",
+    "markdown",
+    "pandoc",
+    "converter",
+    "editor"
+  ],
+  "author": "Amit Haridas <amit.wh@gmail.com>",
   "license": "MIT",
   "devDependencies": {
+    "cross-env": "^10.0.0",
     "electron": "^37.4.0",
     "electron-builder": "^26.0.12",
     "sharp": "^0.34.3"
@@ -27,7 +34,10 @@
     "dompurify": "^3.2.6",
     "electron-store": "^10.1.0",
     "highlight.js": "^11.11.1",
-    "marked": "^16.2.1"
+    "marked": "^16.2.1",
+    "pdf-lib": "^1.17.1",
+    "tslib": "^2.8.1",
+    "xlsx": "^0.18.5"
   },
   "build": {
     "appId": "com.panconverter.app",
@@ -35,19 +45,73 @@
     "directories": {
       "output": "dist"
     },
+    "icon": "assets/icon",
     "files": [
       "src/**/*",
       "assets/**/*",
+      "scripts/**/*",
       "node_modules/**/*",
       "package.json"
     ],
+    "fileAssociations": [
+      {
+        "ext": "md",
+        "name": "Markdown Document",
+        "description": "Markdown Document",
+        "mimeType": "text/markdown",
+        "role": "Editor"
+      },
+      {
+        "ext": "markdown",
+        "name": "Markdown Document",
+        "description": "Markdown Document",
+        "mimeType": "text/markdown",
+        "role": "Editor"
+      }
+    ],
     "mac": {
-      "category": "public.app-category.productivity",
+      "category": "public.app-category.productivity"
-      "icon": "assets/icon.icns"
     },
     "win": {
+      "target": [
+        {
           "target": "nsis",
-      "icon": "assets/icon.ico"
+          "arch": [
+            "x64"
+          ]
+        },
+        {
+          "target": "portable",
+          "arch": [
+            "x64"
+          ]
+        },
+        {
+          "target": "zip",
+          "arch": [
+            "x64"
+          ]
+        }
+      ],
+      "artifactName": "${productName}-${version}-${arch}.${ext}",
+      "requestedExecutionLevel": "asInvoker",
+      "signAndEditExecutable": false
+    },
+    "nsis": {
+      "oneClick": false,
+      "perMachine": false,
+      "allowToChangeInstallationDirectory": true,
+      "displayLanguageSelector": true,
+      "createDesktopShortcut": true,
+      "createStartMenuShortcut": true,
+      "shortcutName": "PanConverter",
+      "runAfterFinish": true,
+      "menuCategory": "Productivity",
+      "license": "LICENSE",
+      "warningsAsErrors": false,
+      "artifactName": "${productName}-Setup-${version}.${ext}",
+      "deleteAppDataOnUninstall": false,
+      "differentialPackage": true
     },
     "linux": {
       "target": [
@@ -55,15 +119,14 @@
         "AppImage",
         "snap"
       ],
-      "category": "Utility",
+      "category": "Utility"
-      "icon": "assets/icon.png"
     },
     "deb": {
       "depends": [
         "pandoc"
       ],
       "description": "Markdown editor and converter using Pandoc",
-      "maintainer": "Your Name <your.email@example.com>"
+      "maintainer": "Amit Haridas <amit.wh@gmail.com>"
     }
   }
 }

scripts/README.md

@@ -0,0 +1,116 @@
+# PanConverter Windows Explorer Context Menu Integration
+
+This directory contains scripts to add PanConverter to the Windows Explorer context menu, allowing you to right-click on files and convert them directly without opening the full application.
+
+## Features
+
+### Context Menu Options
+- **Convert with PanConverter**: Shows a format selection dialog for any supported file
+- **PanConverter > Convert to...**: Direct conversion options (for Markdown files)
+  - PDF
+  - HTML  
+  - DOCX
+  - LaTeX
+  - PowerPoint
+
+### Supported File Types
+- **Markdown**: `.md`, `.markdown`
+- **HTML**: `.html`, `.htm`
+- **Documents**: `.docx`, `.odt`, `.rtf`
+- **LaTeX**: `.tex`
+- **PDF**: `.pdf`
+- **Presentations**: `.pptx`, `.ppt`, `.odp`
+
+## Installation Methods
+
+### Method 1: Automatic (During PanConverter Installation)
+When installing PanConverter using the Windows installer, you'll be prompted to install context menu integration automatically.
+
+### Method 2: Manual Installation
+
+#### Using PowerShell (Recommended)
+1. Right-click on `install-context-menu.ps1`
+2. Select "Run with PowerShell"
+3. Follow the prompts (will request administrator privileges)
+
+#### Using Batch File
+1. Right-click on `install-context-menu.bat`
+2. Select "Run as administrator"
+3. Follow the prompts
+
+#### Using Registry File Directly
+1. Right-click on `install-context-menu.reg`
+2. Select "Merge" 
+3. Confirm the registry modification
+
+## Uninstallation
+
+### Using PowerShell
+```powershell
+.\install-context-menu.ps1 -Uninstall
+```
+
+### Using Batch File
+Run `uninstall-context-menu.bat` as administrator
+
+### Using Registry File
+Run `uninstall-context-menu.reg`
+
+## How It Works
+
+### Command Line Interface
+The context menu integration works by passing command line arguments to PanConverter:
+
+- `--convert <file>`: Shows conversion dialog for the specified file
+- `--convert-to <format> <file>`: Directly converts to the specified format
+
+### Examples
+```batch
+# Show conversion dialog
+PanConverter.exe --convert "document.md"
+
+# Direct conversion to PDF
+PanConverter.exe --convert-to pdf "document.md"
+```
+
+### Conversion Process
+1. PanConverter reads the input file
+2. Creates a temporary file if needed
+3. Uses Pandoc to convert to the target format
+4. Saves the output in the same directory as the input file
+5. Shows a Windows notification when complete
+
+## Requirements
+
+- PanConverter must be installed in the default location: `%LOCALAPPDATA%\Programs\PanConverter\`
+- Pandoc must be installed and accessible from the command line
+- Administrator privileges required for registry modifications
+
+## Troubleshooting
+
+### Context Menu Not Appearing
+1. Ensure you ran the installation script as administrator
+2. Try logging out and back in, or restart Windows Explorer
+3. Check if PanConverter is installed in the expected location
+
+### Conversion Failures
+1. Verify Pandoc is installed: `pandoc --version`
+2. Check if the input file is not corrupted or locked
+3. Ensure you have write permissions in the output directory
+
+### Permission Errors
+- The installation scripts require administrator privileges to modify the registry
+- If you get permission errors, right-click and "Run as administrator"
+
+## File Descriptions
+
+- `install-context-menu.reg`: Registry entries for context menu
+- `uninstall-context-menu.reg`: Registry entries removal
+- `install-context-menu.ps1`: PowerShell installation script
+- `install-context-menu.bat`: Batch installation script  
+- `uninstall-context-menu.bat`: Batch uninstallation script
+- `nsis-installer.nsh`: NSIS installer integration script
+
+## Security Note
+
+The scripts modify the Windows registry to add context menu entries. Only run these scripts if you trust the source and understand the changes being made to your system.

scripts/install-context-menu.bat

@@ -0,0 +1,48 @@
+@echo off
+echo PanConverter Context Menu Installation
+echo =====================================
+echo.
+
+REM Check for administrator privileges
+net session >nul 2>&1
+if %errorLevel% == 0 (
+    echo Running with administrator privileges...
+) else (
+    echo This script requires administrator privileges.
+    echo Please right-click and select "Run as administrator"
+    echo.
+    pause
+    exit /b 1
+)
+
+REM Check if PanConverter is installed
+if not exist "%LOCALAPPDATA%\Programs\PanConverter\PanConverter.exe" (
+    echo Warning: PanConverter not found at the expected location.
+    echo Please ensure PanConverter is installed before continuing.
+    echo Expected location: %LOCALAPPDATA%\Programs\PanConverter\PanConverter.exe
+    echo.
+    set /p continue="Continue anyway? (y/N): "
+    if /i not "%continue%"=="y" exit /b 1
+)
+
+echo Installing context menu entries...
+reg import "%~dp0install-context-menu.reg"
+
+if %errorLevel% == 0 (
+    echo.
+    echo Context menu integration installed successfully!
+    echo.
+    echo You can now right-click on supported files and select:
+    echo • "Convert with PanConverter" - Shows conversion dialog  
+    echo • "PanConverter > Convert to..." - Direct conversion ^(for Markdown^)
+    echo.
+    echo Supported file types:
+    echo .md .markdown .html .htm .docx .odt .rtf .tex .pdf .pptx .ppt .odp
+) else (
+    echo.
+    echo Failed to install context menu entries.
+    echo Please check that the registry file exists and try again.
+)
+
+echo.
+pause

scripts/install-context-menu.ps1

@@ -0,0 +1,67 @@
+# PanConverter Context Menu Installation Script
+# This script installs PanConverter context menu integration for Windows Explorer
+
+param(
+    [switch]$Uninstall = $false
+)
+
+# Check if running as administrator
+if (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {
+    Write-Host "This script requires Administrator privileges. Restarting with elevated permissions..." -ForegroundColor Yellow
+    Start-Process PowerShell -Verb RunAs "-File `"$PSCommandPath`" $(if ($Uninstall) { '-Uninstall' })"
+    exit
+}
+
+$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+$appPath = "${env:LOCALAPPDATA}\Programs\PanConverter\PanConverter.exe"
+
+if ($Uninstall) {
+    Write-Host "Uninstalling PanConverter context menu integration..." -ForegroundColor Yellow
+    $regFile = Join-Path $scriptDir "uninstall-context-menu.reg"
+    
+    if (Test-Path $regFile) {
+        reg import $regFile
+        if ($LASTEXITCODE -eq 0) {
+            Write-Host "PanConverter context menu has been successfully removed!" -ForegroundColor Green
+        } else {
+            Write-Host "Failed to remove context menu entries." -ForegroundColor Red
+        }
+    } else {
+        Write-Host "Uninstall registry file not found: $regFile" -ForegroundColor Red
+    }
+} else {
+    Write-Host "Installing PanConverter context menu integration..." -ForegroundColor Yellow
+    
+    # Check if PanConverter is installed
+    if (-not (Test-Path $appPath)) {
+        Write-Host "Warning: PanConverter executable not found at: $appPath" -ForegroundColor Yellow
+        Write-Host "Please make sure PanConverter is installed before running this script." -ForegroundColor Yellow
+        $continue = Read-Host "Continue anyway? (y/N)"
+        if ($continue -ne 'y' -and $continue -ne 'Y') {
+            exit
+        }
+    }
+    
+    $regFile = Join-Path $scriptDir "install-context-menu.reg"
+    
+    if (Test-Path $regFile) {
+        reg import $regFile
+        if ($LASTEXITCODE -eq 0) {
+            Write-Host "PanConverter context menu has been successfully installed!" -ForegroundColor Green
+            Write-Host "" 
+            Write-Host "You can now right-click on supported files (MD, HTML, DOCX, PDF, etc.) and select:" -ForegroundColor Cyan
+            Write-Host "• 'Convert with PanConverter' - Shows conversion dialog" -ForegroundColor Cyan
+            Write-Host "• 'PanConverter > Convert to...' - Direct conversion options (for Markdown files)" -ForegroundColor Cyan
+            Write-Host ""
+            Write-Host "Supported file types: .md, .markdown, .html, .htm, .docx, .odt, .rtf, .tex, .pdf, .pptx, .ppt, .odp" -ForegroundColor Gray
+        } else {
+            Write-Host "Failed to install context menu entries." -ForegroundColor Red
+        }
+    } else {
+        Write-Host "Install registry file not found: $regFile" -ForegroundColor Red
+    }
+}
+
+Write-Host ""
+Write-Host "Press any key to exit..."
+$null = $Host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")

scripts/install-context-menu.reg

@@ -0,0 +1,134 @@
+Windows Registry Editor Version 5.00
+
+; PanConverter Context Menu Integration
+; This registry file adds context menu options for converting files using PanConverter
+
+; Add context menu for Markdown files (.md, .markdown)
+[HKEY_CLASSES_ROOT\.md\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.md\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+[HKEY_CLASSES_ROOT\.markdown\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.markdown\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+; Add context menu for HTML files
+[HKEY_CLASSES_ROOT\.html\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.html\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+[HKEY_CLASSES_ROOT\.htm\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.htm\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+; Add context menu for DOCX files
+[HKEY_CLASSES_ROOT\.docx\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.docx\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+; Add context menu for ODT files
+[HKEY_CLASSES_ROOT\.odt\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.odt\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+; Add context menu for RTF files
+[HKEY_CLASSES_ROOT\.rtf\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.rtf\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+; Add context menu for LaTeX files
+[HKEY_CLASSES_ROOT\.tex\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.tex\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+; Add context menu for PDF files
+[HKEY_CLASSES_ROOT\.pdf\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.pdf\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+; Add context menu for PowerPoint files
+[HKEY_CLASSES_ROOT\.pptx\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.pptx\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+[HKEY_CLASSES_ROOT\.ppt\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.ppt\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+; Add context menu for OpenDocument Presentation files
+[HKEY_CLASSES_ROOT\.odp\shell\PanConverter]
+@="Convert with PanConverter"
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+
+[HKEY_CLASSES_ROOT\.odp\shell\PanConverter\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert \"%1\""
+
+; Add submenu with specific conversion options for Markdown files
+[HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu]
+@="PanConverter"
+"MUIVerb"="Convert to..."
+"Icon"="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\""
+"SubCommands"=""
+
+[HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu\shell\PDF]
+@="PDF"
+
+[HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu\shell\PDF\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert-to pdf \"%1\""
+
+[HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu\shell\HTML]
+@="HTML"
+
+[HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu\shell\HTML\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert-to html \"%1\""
+
+[HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu\shell\DOCX]
+@="DOCX"
+
+[HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu\shell\DOCX\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert-to docx \"%1\""
+
+[HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu\shell\LaTeX]
+@="LaTeX"
+
+[HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu\shell\LaTeX\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert-to latex \"%1\""
+
+[HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu\shell\PPTX]
+@="PowerPoint"
+
+[HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu\shell\PPTX\command]
+@="\"%LOCALAPPDATA%\\Programs\\PanConverter\\PanConverter.exe\" --convert-to pptx \"%1\""

scripts/nsis-installer.nsh

@@ -0,0 +1,145 @@
+; PanConverter NSIS Installer Include File
+; Handles context menu installation and uninstallation
+
+!include "LogicLib.nsh"
+!include "MUI2.nsh"
+
+; Custom installation page for context menu option
+Var ContextMenuCheckbox
+Var ContextMenuState
+
+Function ContextMenuPage
+    !insertmacro MUI_HEADER_TEXT "Additional Options" "Choose additional installation options"
+    
+    nsDialogs::Create 1018
+    Pop $0
+    
+    ${If} $0 == error
+        Abort
+    ${EndIf}
+    
+    ${NSD_CreateLabel} 0 0 100% 20u "Select additional features to install:"
+    Pop $0
+    
+    ${NSD_CreateCheckbox} 20u 30u 280u 15u "Add PanConverter to Windows Explorer context menu"
+    Pop $ContextMenuCheckbox
+    ${NSD_SetState} $ContextMenuCheckbox ${BST_CHECKED}
+    
+    ${NSD_CreateLabel} 20u 50u 280u 30u "This will allow you to right-click on supported files and convert them directly using PanConverter."
+    Pop $0
+    
+    nsDialogs::Show
+FunctionEnd
+
+Function ContextMenuPageLeave
+    ${NSD_GetState} $ContextMenuCheckbox $ContextMenuState
+FunctionEnd
+
+; Install context menu entries
+Function InstallContextMenu
+    ${If} $ContextMenuState == ${BST_CHECKED}
+        DetailPrint "Installing context menu integration..."
+        
+        ; Create registry entries for context menu
+        WriteRegStr HKCR ".md\shell\PanConverter" "" "Convert with PanConverter"
+        WriteRegStr HKCR ".md\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".md\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        WriteRegStr HKCR ".markdown\shell\PanConverter" "" "Convert with PanConverter"  
+        WriteRegStr HKCR ".markdown\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".markdown\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        ; Context menu for HTML files
+        WriteRegStr HKCR ".html\shell\PanConverter" "" "Convert with PanConverter"
+        WriteRegStr HKCR ".html\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".html\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        WriteRegStr HKCR ".htm\shell\PanConverter" "" "Convert with PanConverter"
+        WriteRegStr HKCR ".htm\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".htm\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        ; Context menu for DOCX files
+        WriteRegStr HKCR ".docx\shell\PanConverter" "" "Convert with PanConverter"
+        WriteRegStr HKCR ".docx\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".docx\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        ; Context menu for ODT files
+        WriteRegStr HKCR ".odt\shell\PanConverter" "" "Convert with PanConverter"
+        WriteRegStr HKCR ".odt\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".odt\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        ; Context menu for RTF files
+        WriteRegStr HKCR ".rtf\shell\PanConverter" "" "Convert with PanConverter"
+        WriteRegStr HKCR ".rtf\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".rtf\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        ; Context menu for LaTeX files
+        WriteRegStr HKCR ".tex\shell\PanConverter" "" "Convert with PanConverter"
+        WriteRegStr HKCR ".tex\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".tex\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        ; Context menu for PDF files
+        WriteRegStr HKCR ".pdf\shell\PanConverter" "" "Convert with PanConverter"
+        WriteRegStr HKCR ".pdf\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".pdf\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        ; Context menu for PowerPoint files
+        WriteRegStr HKCR ".pptx\shell\PanConverter" "" "Convert with PanConverter"
+        WriteRegStr HKCR ".pptx\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".pptx\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        WriteRegStr HKCR ".ppt\shell\PanConverter" "" "Convert with PanConverter"
+        WriteRegStr HKCR ".ppt\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".ppt\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        ; Context menu for ODP files
+        WriteRegStr HKCR ".odp\shell\PanConverter" "" "Convert with PanConverter"
+        WriteRegStr HKCR ".odp\shell\PanConverter" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".odp\shell\PanConverter\command" "" '"$INSTDIR\PanConverter.exe" --convert "%1"'
+        
+        ; Submenu for Markdown files with direct conversion options
+        WriteRegStr HKCR ".md\shell\PanConverterMenu" "" "PanConverter"
+        WriteRegStr HKCR ".md\shell\PanConverterMenu" "MUIVerb" "Convert to..."
+        WriteRegStr HKCR ".md\shell\PanConverterMenu" "Icon" "$INSTDIR\PanConverter.exe"
+        WriteRegStr HKCR ".md\shell\PanConverterMenu" "SubCommands" ""
+        
+        WriteRegStr HKCR ".md\shell\PanConverterMenu\shell\PDF" "" "PDF"
+        WriteRegStr HKCR ".md\shell\PanConverterMenu\shell\PDF\command" "" '"$INSTDIR\PanConverter.exe" --convert-to pdf "%1"'
+        
+        WriteRegStr HKCR ".md\shell\PanConverterMenu\shell\HTML" "" "HTML"
+        WriteRegStr HKCR ".md\shell\PanConverterMenu\shell\HTML\command" "" '"$INSTDIR\PanConverter.exe" --convert-to html "%1"'
+        
+        WriteRegStr HKCR ".md\shell\PanConverterMenu\shell\DOCX" "" "DOCX"
+        WriteRegStr HKCR ".md\shell\PanConverterMenu\shell\DOCX\command" "" '"$INSTDIR\PanConverter.exe" --convert-to docx "%1"'
+        
+        WriteRegStr HKCR ".md\shell\PanConverterMenu\shell\LaTeX" "" "LaTeX"
+        WriteRegStr HKCR ".md\shell\PanConverterMenu\shell\LaTeX\command" "" '"$INSTDIR\PanConverter.exe" --convert-to latex "%1"'
+        
+        WriteRegStr HKCR ".md\shell\PanConverterMenu\shell\PPTX" "" "PowerPoint"
+        WriteRegStr HKCR ".md\shell\PanConverterMenu\shell\PPTX\command" "" '"$INSTDIR\PanConverter.exe" --convert-to pptx "%1"'
+        
+        DetailPrint "Context menu integration installed successfully!"
+    ${EndIf}
+FunctionEnd
+
+; Uninstall context menu entries
+Function un.RemoveContextMenu
+    DetailPrint "Removing context menu integration..."
+    
+    ; Remove context menu entries for all file types
+    DeleteRegKey HKCR ".md\shell\PanConverter"
+    DeleteRegKey HKCR ".md\shell\PanConverterMenu"
+    DeleteRegKey HKCR ".markdown\shell\PanConverter"
+    DeleteRegKey HKCR ".html\shell\PanConverter"
+    DeleteRegKey HKCR ".htm\shell\PanConverter"
+    DeleteRegKey HKCR ".docx\shell\PanConverter"
+    DeleteRegKey HKCR ".odt\shell\PanConverter"
+    DeleteRegKey HKCR ".rtf\shell\PanConverter"
+    DeleteRegKey HKCR ".tex\shell\PanConverter"
+    DeleteRegKey HKCR ".pdf\shell\PanConverter"
+    DeleteRegKey HKCR ".pptx\shell\PanConverter"
+    DeleteRegKey HKCR ".ppt\shell\PanConverter"
+    DeleteRegKey HKCR ".odp\shell\PanConverter"
+    
+    DetailPrint "Context menu integration removed successfully!"
+FunctionEnd

scripts/uninstall-context-menu.bat

@@ -0,0 +1,32 @@
+@echo off
+echo PanConverter Context Menu Uninstallation
+echo ========================================
+echo.
+
+REM Check for administrator privileges
+net session >nul 2>&1
+if %errorLevel% == 0 (
+    echo Running with administrator privileges...
+) else (
+    echo This script requires administrator privileges.
+    echo Please right-click and select "Run as administrator"
+    echo.
+    pause
+    exit /b 1
+)
+
+echo Removing context menu entries...
+reg import "%~dp0uninstall-context-menu.reg"
+
+if %errorLevel% == 0 (
+    echo.
+    echo Context menu integration removed successfully!
+    echo PanConverter entries have been removed from the Windows Explorer context menu.
+) else (
+    echo.
+    echo Failed to remove context menu entries.
+    echo Please check that the registry file exists and try again.
+)
+
+echo.
+pause

scripts/uninstall-context-menu.reg

@@ -0,0 +1,36 @@
+Windows Registry Editor Version 5.00
+
+; PanConverter Context Menu Uninstall Script
+; This registry file removes PanConverter context menu entries
+
+; Remove context menu for Markdown files (.md, .markdown)
+[-HKEY_CLASSES_ROOT\.md\shell\PanConverter]
+[-HKEY_CLASSES_ROOT\.md\shell\PanConverterMenu]
+
+[-HKEY_CLASSES_ROOT\.markdown\shell\PanConverter]
+
+; Remove context menu for HTML files
+[-HKEY_CLASSES_ROOT\.html\shell\PanConverter]
+[-HKEY_CLASSES_ROOT\.htm\shell\PanConverter]
+
+; Remove context menu for DOCX files
+[-HKEY_CLASSES_ROOT\.docx\shell\PanConverter]
+
+; Remove context menu for ODT files
+[-HKEY_CLASSES_ROOT\.odt\shell\PanConverter]
+
+; Remove context menu for RTF files
+[-HKEY_CLASSES_ROOT\.rtf\shell\PanConverter]
+
+; Remove context menu for LaTeX files
+[-HKEY_CLASSES_ROOT\.tex\shell\PanConverter]
+
+; Remove context menu for PDF files
+[-HKEY_CLASSES_ROOT\.pdf\shell\PanConverter]
+
+; Remove context menu for PowerPoint files
+[-HKEY_CLASSES_ROOT\.pptx\shell\PanConverter]
+[-HKEY_CLASSES_ROOT\.ppt\shell\PanConverter]
+
+; Remove context menu for OpenDocument Presentation files
+[-HKEY_CLASSES_ROOT\.odp\shell\PanConverter]

src/index.html

@@ -4,12 +4,23 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>PanConverter - Markdown Editor</title>
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap" rel="stylesheet">
     <link rel="stylesheet" href="styles.css">
+    <link rel="stylesheet" href="styles-modern.css">
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/6.65.7/codemirror.min.css">
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/default.min.css">
 </head>
 <body>
     <div class="container">
+        <div class="tab-bar" id="tab-bar">
+            <div class="tab active" data-tab-id="1">
+                <span class="tab-title">Untitled</span>
+                <button class="tab-close" title="Close tab">×</button>
+            </div>
+            <button class="new-tab-button" id="new-tab-btn" title="New tab">+</button>
+        </div>
         <div class="toolbar">
             <button id="btn-bold" title="Bold">
                 <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
@@ -59,6 +70,50 @@
                     <path d="M15 21c3 0 7-1 7-8V5c0-1.25-.757-2.017-2-2h-4c-1.25 0-2 .75-2 1.972V11c0 1.25.75 2 2 2h.75c0 2.25.25 4-2.75 4v3c0 1 0 1 1 1z"></path>
                 </svg>
             </button>
+            <button id="btn-table" title="Insert Table">
+                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                    <rect x="3" y="3" width="18" height="18" rx="2" ry="2"></rect>
+                    <line x1="3" y1="9" x2="21" y2="9"></line>
+                    <line x1="3" y1="15" x2="21" y2="15"></line>
+                    <line x1="9" y1="3" x2="9" y2="21"></line>
+                    <line x1="15" y1="3" x2="15" y2="21"></line>
+                </svg>
+            </button>
+            <button id="btn-strikethrough" title="Strikethrough">
+                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                    <path d="M16 4H9a3 3 0 0 0-2.83 4"></path>
+                    <path d="M14 12a4 4 0 0 1 0 8H6"></path>
+                    <line x1="4" y1="12" x2="20" y2="12"></line>
+                </svg>
+            </button>
+            <button id="btn-code-block" title="Code Block">
+                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                    <rect x="2" y="6" width="20" height="12" rx="2"></rect>
+                    <path d="m10 10-2 2 2 2"></path>
+                    <path d="m14 10 2 2-2 2"></path>
+                </svg>
+            </button>
+            <button id="btn-horizontal-rule" title="Horizontal Rule">
+                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                    <line x1="3" y1="12" x2="21" y2="12"></line>
+                    <line x1="3" y1="6" x2="21" y2="6"></line>
+                    <line x1="3" y1="18" x2="21" y2="18"></line>
+                </svg>
+            </button>
+            <div class="toolbar-separator"></div>
+            <button id="btn-find" title="Find & Replace (Ctrl+F)">
+                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                    <circle cx="11" cy="11" r="8"></circle>
+                    <path d="m21 21-4.35-4.35"></path>
+                </svg>
+            </button>
+            <button id="btn-line-numbers" title="Toggle Line Numbers">
+                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                    <path d="M3 6h18"></path>
+                    <path d="M3 12h18"></path>
+                    <path d="M3 18h18"></path>
+                </svg>
+            </button>
             <div class="toolbar-separator"></div>
             <button id="btn-preview-toggle" title="Toggle Preview">
                 <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
@@ -68,12 +123,818 @@
             </button>
         </div>
         
+        <!-- Find & Replace Dialog -->
+        <div id="find-dialog" class="find-dialog hidden">
+            <div class="find-controls">
+                <input type="text" id="find-input" placeholder="Find...">
+                <input type="text" id="replace-input" placeholder="Replace...">
+                <button id="btn-find-prev" title="Previous">↑</button>
+                <button id="btn-find-next" title="Next">↓</button>
+                <button id="btn-replace" title="Replace">Replace</button>
+                <button id="btn-replace-all" title="Replace All">All</button>
+                <button id="btn-find-close" title="Close">×</button>
+            </div>
+            <div class="find-info">
+                <span id="find-count">0 matches</span>
+            </div>
+        </div>
+
+        <!-- Export Options Dialog -->
+        <div id="export-dialog" class="export-dialog hidden">
+            <div class="export-dialog-content">
+                <div class="export-dialog-header">
+                    <h3 id="export-dialog-title">Export Options</h3>
+                    <button id="export-dialog-close" title="Close">×</button>
+                </div>
+                <div class="export-dialog-body">
+                    <!-- Simple/Advanced Export Toggle -->
+                    <div class="export-section export-mode-toggle">
+                        <label class="checkbox-label">
+                            <input type="checkbox" id="advanced-export-toggle">
+                            <span class="checkmark"></span>
+                            Show Advanced Options
+                        </label>
+                        <small class="export-help">Enable for templates, metadata, bibliography, and advanced PDF settings</small>
+                    </div>
+
+                    <!-- Advanced Export Options (hidden by default) -->
+                    <div id="advanced-export-options" class="advanced-options hidden">
+                        <div class="export-section">
+                            <label for="export-template">Template:</label>
+                        <select id="export-template">
+                            <option value="default">Default</option>
+                            <option value="custom">Custom (Browse...)</option>
+                        </select>
+                        <input type="file" id="template-file-input" accept=".tex,.html,.docx,.odt" style="display: none;">
+                        <input type="text" id="custom-template-path" placeholder="Template file path..." style="display: none;">
+                    </div>
+
+                    <div class="export-section">
+                        <label>Metadata:</label>
+                        <div class="metadata-container">
+                            <div class="metadata-field">
+                                <input type="text" placeholder="title" class="metadata-key">
+                                <input type="text" placeholder="Document title" class="metadata-value">
+                            </div>
+                            <div class="metadata-field">
+                                <input type="text" placeholder="author" class="metadata-key">
+                                <input type="text" placeholder="Author name" class="metadata-value">
+                            </div>
+                            <div class="metadata-field">
+                                <input type="text" placeholder="date" class="metadata-key">
+                                <input type="text" placeholder="Date" class="metadata-value">
+                            </div>
+                            <div class="metadata-field">
+                                <input type="text" placeholder="subject" class="metadata-key">
+                                <input type="text" placeholder="Subject" class="metadata-value">
+                            </div>
+                        </div>
+                        <button id="add-metadata-field" type="button">+ Add Field</button>
+                    </div>
+
+                    <div class="export-section">
+                        <label>Document Options:</label>
+                        <div class="checkbox-group">
+                            <label><input type="checkbox" id="export-toc"> Table of Contents</label>
+                            <label><input type="checkbox" id="export-number-sections"> Number Sections</label>
+                            <label><input type="checkbox" id="export-citeproc"> Process Citations</label>
+                        </div>
+                        <div class="form-row">
+                            <label for="export-toc-depth">TOC Depth:</label>
+                            <input type="number" id="export-toc-depth" min="1" max="6" value="3">
+                        </div>
+                    </div>
+
+                    <div class="export-section pdf-only">
+                        <label>PDF Options:</label>
+                        <div class="form-row">
+                            <label for="pdf-engine">PDF Engine:</label>
+                            <select id="pdf-engine">
+                                <option value="xelatex">XeLaTeX (Recommended)</option>
+                                <option value="pdflatex">PDFLaTeX</option>
+                                <option value="lualatex">LuaLaTeX</option>
+                            </select>
+                        </div>
+                        <div class="form-row">
+                            <label for="pdf-geometry">Page Margins:</label>
+                            <select id="pdf-geometry">
+                                <option value="margin=1in">1 inch (Default)</option>
+                                <option value="margin=0.75in">0.75 inch</option>
+                                <option value="margin=1.25in">1.25 inch</option>
+                                <option value="margin=2cm">2 cm</option>
+                                <option value="margin=2.5cm">2.5 cm</option>
+                                <option value="custom">Custom...</option>
+                            </select>
+                            <input type="text" id="custom-geometry" placeholder="e.g., margin=1.5in" style="display: none;">
+                        </div>
+                    </div>
+
+                    <div class="export-section">
+                        <label>Bibliography:</label>
+                        <div class="form-row">
+                            <input type="text" id="bibliography-file" placeholder="Bibliography file (.bib, .yaml, .json)">
+                            <button id="browse-bibliography">Browse</button>
+                        </div>
+                        <div class="form-row">
+                            <input type="text" id="csl-file" placeholder="Citation style file (.csl)">
+                            <button id="browse-csl">Browse</button>
+                        </div>
+                    </div>
+                    </div> <!-- End advanced-export-options -->
+
+                    <!-- Basic Export Options (always visible) -->
+                    <div class="export-section basic-options">
+                        <label>Quick Export Settings:</label>
+                        <div class="checkbox-group">
+                            <label><input type="checkbox" id="basic-toc"> Include Table of Contents</label>
+                            <label><input type="checkbox" id="basic-number-sections"> Number Sections</label>
+                        </div>
+                    </div>
+                </div>
+                <div class="export-dialog-footer">
+                    <button id="export-cancel">Cancel</button>
+                    <button id="export-confirm" class="primary">Export</button>
+                </div>
+            </div>
+        </div>
+
+        <!-- Universal File Converter Dialog -->
+        <div id="universal-converter-dialog" class="export-dialog hidden">
+            <div class="export-dialog-content">
+                <div class="export-dialog-header">
+                    <h3>Universal File Converter</h3>
+                    <button id="converter-dialog-close" title="Close">×</button>
+                </div>
+                <div class="export-dialog-body">
+                    <div class="export-section">
+                        <label>Select File to Convert:</label>
+                        <div class="folder-input-group">
+                            <input type="text" id="converter-file-path" placeholder="Browse for a file..." readonly>
+                            <button id="browse-converter-file">Browse</button>
+                        </div>
+                        <small>Supported formats: Documents, Images, Media files</small>
+                    </div>
+
+                    <div class="export-section">
+                        <label for="converter-tool">Conversion Tool:</label>
+                        <select id="converter-tool">
+                            <option value="libreoffice">LibreOffice (Documents)</option>
+                            <option value="imagemagick">ImageMagick (Images)</option>
+                            <option value="ffmpeg">FFmpeg (Media)</option>
+                            <option value="pandoc">Pandoc (Markup)</option>
+                        </select>
+                        <small id="converter-tool-help">Documents: DOCX, PDF, ODT, RTF, TXT, HTML, XLSX, PPTX</small>
+                    </div>
+
+                    <div class="export-section">
+                        <label for="converter-from">Input Format:</label>
+                        <select id="converter-from">
+                            <!-- Dynamically populated based on selected converter tool -->
+                        </select>
+                    </div>
+
+                    <div class="export-section">
+                        <label for="converter-to">Output Format:</label>
+                        <select id="converter-to">
+                            <!-- Dynamically populated based on selected converter tool -->
+                        </select>
+                    </div>
+
+                    <!-- Batch Mode Toggle -->
+                    <div class="export-section">
+                        <label class="checkbox-label">
+                            <input type="checkbox" id="converter-batch-mode">
+                            <span class="checkmark"></span>
+                            Batch Mode (Convert entire folder)
+                        </label>
+                        <small class="export-help">Enable to convert multiple files at once from a folder</small>
+                    </div>
+
+                    <!-- Batch Mode Options (hidden by default) -->
+                    <div id="converter-batch-options" class="advanced-options hidden">
+                        <div class="export-section">
+                            <label>Input Folder:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="converter-batch-input-folder" placeholder="Select folder..." readonly>
+                                <button id="browse-converter-batch-input">Browse</button>
+                            </div>
+                        </div>
+
+                        <div class="export-section">
+                            <label>Output Folder:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="converter-batch-output-folder" placeholder="Select output folder..." readonly>
+                                <button id="browse-converter-batch-output">Browse</button>
+                            </div>
+                        </div>
+
+                        <div class="export-section">
+                            <label>
+                                <input type="checkbox" id="converter-batch-subfolders" checked>
+                                Include subfolders (recursive)
+                            </label>
+                        </div>
+                    </div>
+
+                    <!-- Advanced Options Toggle -->
+                    <div class="export-section export-mode-toggle">
+                        <label class="checkbox-label">
+                            <input type="checkbox" id="converter-advanced-toggle">
+                            <span class="checkmark"></span>
+                            Show Advanced Options
+                        </label>
+                        <small class="export-help">Tool-specific quality, compression, and conversion settings</small>
+                    </div>
+
+                    <!-- Advanced Converter Options (hidden by default) -->
+                    <div id="converter-advanced-options" class="advanced-options hidden">
+                        <!-- ImageMagick Advanced Options -->
+                        <div class="converter-options imagemagick-options hidden">
+                            <div class="export-section">
+                                <label for="imagemagick-quality">Quality (1-100):</label>
+                                <input type="range" id="imagemagick-quality" min="1" max="100" value="85">
+                                <span id="imagemagick-quality-value">85</span>
+                            </div>
+
+                            <div class="export-section">
+                                <label for="imagemagick-dpi">Resolution (DPI):</label>
+                                <input type="number" id="imagemagick-dpi" min="72" max="600" value="300" placeholder="300">
+                                <small>Higher DPI = better quality, larger file size</small>
+                            </div>
+
+                            <div class="export-section">
+                                <label for="imagemagick-resize">Resize (WxH):</label>
+                                <input type="text" id="imagemagick-resize" placeholder="e.g., 1920x1080 or 50%">
+                                <small>Examples: 1920x1080, 800x600, 50% (leave empty for no resize)</small>
+                            </div>
+
+                            <div class="export-section">
+                                <label for="imagemagick-compression">Compression Type:</label>
+                                <select id="imagemagick-compression">
+                                    <option value="">None (Default)</option>
+                                    <option value="JPEG">JPEG</option>
+                                    <option value="LZW">LZW</option>
+                                    <option value="Zip">Zip</option>
+                                    <option value="RLE">RLE</option>
+                                </select>
+                            </div>
+                        </div>
+
+                        <!-- FFmpeg Advanced Options -->
+                        <div class="converter-options ffmpeg-options hidden">
+                            <div class="export-section">
+                                <label for="ffmpeg-video-codec">Video Codec:</label>
+                                <select id="ffmpeg-video-codec">
+                                    <option value="">Default</option>
+                                    <option value="libx264">H.264 (libx264)</option>
+                                    <option value="libx265">H.265/HEVC (libx265)</option>
+                                    <option value="libvpx-vp9">VP9 (libvpx-vp9)</option>
+                                    <option value="copy">Copy (no re-encode)</option>
+                                </select>
+                            </div>
+
+                            <div class="export-section">
+                                <label for="ffmpeg-audio-codec">Audio Codec:</label>
+                                <select id="ffmpeg-audio-codec">
+                                    <option value="">Default</option>
+                                    <option value="aac">AAC</option>
+                                    <option value="libmp3lame">MP3 (libmp3lame)</option>
+                                    <option value="libopus">Opus (libopus)</option>
+                                    <option value="libvorbis">Vorbis (libvorbis)</option>
+                                    <option value="copy">Copy (no re-encode)</option>
+                                </select>
+                            </div>
+
+                            <div class="export-section">
+                                <label for="ffmpeg-bitrate">Video Bitrate (kbps):</label>
+                                <input type="number" id="ffmpeg-bitrate" min="100" max="50000" placeholder="e.g., 2000">
+                                <small>Higher bitrate = better quality, larger file size</small>
+                            </div>
+
+                            <div class="export-section">
+                                <label for="ffmpeg-preset">Encoding Preset:</label>
+                                <select id="ffmpeg-preset">
+                                    <option value="">Default</option>
+                                    <option value="ultrafast">Ultra Fast</option>
+                                    <option value="fast">Fast</option>
+                                    <option value="medium" selected>Medium</option>
+                                    <option value="slow">Slow (Better Quality)</option>
+                                    <option value="veryslow">Very Slow (Best Quality)</option>
+                                </select>
+                            </div>
+
+                            <div class="export-section">
+                                <label for="ffmpeg-framerate">Frame Rate (fps):</label>
+                                <input type="number" id="ffmpeg-framerate" min="1" max="120" placeholder="e.g., 30">
+                                <small>Common: 24, 30, 60</small>
+                            </div>
+                        </div>
+
+                        <!-- LibreOffice Advanced Options -->
+                        <div class="converter-options libreoffice-options hidden">
+                            <div class="export-section">
+                                <label for="libreoffice-quality">Export Quality:</label>
+                                <select id="libreoffice-quality">
+                                    <option value="">Default</option>
+                                    <option value="high">High</option>
+                                    <option value="medium" selected>Medium</option>
+                                    <option value="low">Low (Smaller file size)</option>
+                                </select>
+                            </div>
+
+                            <div class="export-section">
+                                <label for="libreoffice-page-range">Page Range:</label>
+                                <input type="text" id="libreoffice-page-range" placeholder="e.g., 1-5, 7, 9-12">
+                                <small>Leave empty to convert all pages</small>
+                            </div>
+
+                            <div class="export-section">
+                                <label>
+                                    <input type="checkbox" id="libreoffice-export-bookmarks">
+                                    Export Bookmarks (PDF only)
+                                </label>
+                            </div>
+                        </div>
+
+                        <!-- Pandoc Advanced Options -->
+                        <div class="converter-options pandoc-options hidden">
+                            <div class="export-section">
+                                <small>Pandoc conversions can use advanced export options from the Export menu.</small>
+                                <button id="pandoc-show-export-options" type="button">Open Export Options Dialog...</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <div id="converter-progress" class="batch-progress hidden">
+                        <div class="progress-text">
+                            <span id="converter-status">Converting...</span>
+                        </div>
+                    </div>
+
+                    <div class="export-section">
+                        <small><strong>Installation Notes:</strong></small>
+                        <small>• LibreOffice: Download from <a href="https://www.libreoffice.org/download" target="_blank">libreoffice.org</a></small>
+                        <small>• ImageMagick: Download from <a href="https://imagemagick.org/script/download.php" target="_blank">imagemagick.org</a></small>
+                        <small>• FFmpeg: Download from <a href="https://ffmpeg.org/download.html" target="_blank">ffmpeg.org</a></small>
+                        <small>• Pandoc: Download from <a href="https://pandoc.org/installing.html" target="_blank">pandoc.org</a></small>
+                    </div>
+                </div>
+                <div class="export-dialog-footer">
+                    <button id="converter-cancel">Cancel</button>
+                    <button id="converter-convert" class="primary">Convert</button>
+                </div>
+            </div>
+        </div>
+
+        <!-- Batch Conversion Dialog -->
+        <div id="batch-dialog" class="batch-dialog hidden">
+            <div class="batch-dialog-content">
+                <div class="batch-dialog-header">
+                    <h3>Batch File Conversion</h3>
+                    <button id="batch-dialog-close" title="Close">×</button>
+                </div>
+                <div class="batch-dialog-body">
+                    <div class="batch-section">
+                        <label>Input Folder:</label>
+                        <div class="folder-input-group">
+                            <input type="text" id="batch-input-folder" placeholder="Select folder containing markdown files..." readonly>
+                            <button id="browse-input-folder">Browse</button>
+                        </div>
+                    </div>
+
+                    <div class="batch-section">
+                        <label>Output Folder:</label>
+                        <div class="folder-input-group">
+                            <input type="text" id="batch-output-folder" placeholder="Select output folder..." readonly>
+                            <button id="browse-output-folder">Browse</button>
+                        </div>
+                    </div>
+
+                    <div class="batch-section">
+                        <label for="batch-format">Output Format:</label>
+                        <select id="batch-format">
+                            <option value="html">HTML</option>
+                            <option value="pdf">PDF</option>
+                            <option value="docx">DOCX</option>
+                            <option value="latex">LaTeX</option>
+                            <option value="rtf">RTF</option>
+                            <option value="odt">ODT</option>
+                            <option value="epub">EPUB</option>
+                            <option value="pptx">PowerPoint (PPTX)</option>
+                            <option value="odp">OpenDocument Presentation (ODP)</option>
+                        </select>
+                    </div>
+
+                    <div class="batch-section">
+                        <label>
+                            <input type="checkbox" id="batch-include-subfolders" checked>
+                            Include subfolders (recursive)
+                        </label>
+                    </div>
+
+                    <div class="batch-section">
+                        <button id="batch-show-options" type="button">Advanced Export Options...</button>
+                    </div>
+
+                    <div id="batch-progress" class="batch-progress hidden">
+                        <div class="progress-bar">
+                            <div class="progress-fill" id="batch-progress-fill"></div>
+                        </div>
+                        <div class="progress-text">
+                            <span id="batch-progress-text">Processing...</span>
+                            <span id="batch-progress-count">0 / 0</span>
+                        </div>
+                    </div>
+                </div>
+                <div class="batch-dialog-footer">
+                    <button id="batch-cancel">Cancel</button>
+                    <button id="batch-start" class="primary" disabled>Start Conversion</button>
+                </div>
+            </div>
+        </div>
+
+        <!-- PDF Editor Dialog -->
+        <div id="pdf-editor-dialog" class="export-dialog hidden">
+            <div class="export-dialog-content">
+                <div class="export-dialog-header">
+                    <h3 id="pdf-editor-title">PDF Editor</h3>
+                    <button id="pdf-editor-dialog-close" title="Close">×</button>
+                </div>
+                <div class="export-dialog-body">
+                    <!-- Merge PDFs Section -->
+                    <div id="pdf-merge-section" class="pdf-operation-section hidden">
+                        <div class="export-section">
+                            <label>PDF Files to Merge:</label>
+                            <div id="merge-files-list" class="file-list">
+                                <!-- Dynamically added file entries -->
+                            </div>
+                            <button id="add-merge-file" type="button">+ Add PDF File</button>
+                            <small>Files will be merged in the order shown. Drag to reorder.</small>
+                        </div>
+                        <div class="export-section">
+                            <label>Output File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="merge-output-path" placeholder="Choose output location..." readonly>
+                                <button id="browse-merge-output">Browse</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <!-- Split PDF Section -->
+                    <div id="pdf-split-section" class="pdf-operation-section hidden">
+                        <div class="export-section">
+                            <label>PDF File to Split:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="split-input-path" placeholder="Select PDF file..." readonly>
+                                <button id="browse-split-input">Browse</button>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>Split Mode:</label>
+                            <select id="split-mode">
+                                <option value="pages">By Page Range</option>
+                                <option value="interval">Every N Pages</option>
+                                <option value="size">By File Size</option>
+                            </select>
+                        </div>
+                        <div id="split-pages-options" class="export-section">
+                            <label>Page Ranges:</label>
+                            <input type="text" id="split-page-ranges" placeholder="e.g., 1-5, 6-10, 11-15">
+                            <small>Separate ranges with commas. Each range will create a new PDF.</small>
+                        </div>
+                        <div id="split-interval-options" class="export-section hidden">
+                            <label>Split Every:</label>
+                            <input type="number" id="split-interval" min="1" value="5" placeholder="5">
+                            <small>pages (e.g., 5 = split every 5 pages)</small>
+                        </div>
+                        <div id="split-size-options" class="export-section hidden">
+                            <label>Max File Size (MB):</label>
+                            <input type="number" id="split-size" min="1" value="5" placeholder="5">
+                            <small>Split when file size exceeds this limit</small>
+                        </div>
+                        <div class="export-section">
+                            <label>Output Folder:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="split-output-folder" placeholder="Select output folder..." readonly>
+                                <button id="browse-split-output">Browse</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <!-- Compress PDF Section -->
+                    <div id="pdf-compress-section" class="pdf-operation-section hidden">
+                        <div class="export-section">
+                            <label>PDF File to Compress:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="compress-input-path" placeholder="Select PDF file..." readonly>
+                                <button id="browse-compress-input">Browse</button>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>Compression Level:</label>
+                            <select id="compress-level">
+                                <option value="low">Low (Best Quality)</option>
+                                <option value="medium" selected>Medium (Balanced)</option>
+                                <option value="high">High (Smallest Size)</option>
+                            </select>
+                            <small>Higher compression = smaller file size, lower quality</small>
+                        </div>
+                        <div class="export-section">
+                            <label>Compression Options:</label>
+                            <div class="checkbox-group">
+                                <label><input type="checkbox" id="compress-images" checked> Compress Images</label>
+                                <label><input type="checkbox" id="compress-remove-duplicates" checked> Remove Duplicates</label>
+                                <label><input type="checkbox" id="compress-optimize-fonts"> Optimize Fonts</label>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>Output File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="compress-output-path" placeholder="Choose output location..." readonly>
+                                <button id="browse-compress-output">Browse</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <!-- Rotate Pages Section -->
+                    <div id="pdf-rotate-section" class="pdf-operation-section hidden">
+                        <div class="export-section">
+                            <label>PDF File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="rotate-input-path" placeholder="Select PDF file..." readonly>
+                                <button id="browse-rotate-input">Browse</button>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>Pages to Rotate:</label>
+                            <input type="text" id="rotate-pages" placeholder="e.g., 1-5, 7, 9-12 (leave empty for all pages)">
+                            <small>Separate page numbers/ranges with commas, or leave empty to rotate all pages</small>
+                        </div>
+                        <div class="export-section">
+                            <label>Rotation Angle:</label>
+                            <select id="rotate-angle">
+                                <option value="90">90° Clockwise</option>
+                                <option value="180">180°</option>
+                                <option value="270">270° Clockwise (90° Counter-clockwise)</option>
+                            </select>
+                        </div>
+                        <div class="export-section">
+                            <label>Output File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="rotate-output-path" placeholder="Choose output location..." readonly>
+                                <button id="browse-rotate-output">Browse</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <!-- Delete Pages Section -->
+                    <div id="pdf-delete-section" class="pdf-operation-section hidden">
+                        <div class="export-section">
+                            <label>PDF File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="delete-input-path" placeholder="Select PDF file..." readonly>
+                                <button id="browse-delete-input">Browse</button>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>Pages to Delete:</label>
+                            <input type="text" id="delete-pages" placeholder="e.g., 1-5, 7, 9-12">
+                            <small>Separate page numbers/ranges with commas</small>
+                        </div>
+                        <div class="export-section">
+                            <label>Output File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="delete-output-path" placeholder="Choose output location..." readonly>
+                                <button id="browse-delete-output">Browse</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <!-- Reorder Pages Section -->
+                    <div id="pdf-reorder-section" class="pdf-operation-section hidden">
+                        <div class="export-section">
+                            <label>PDF File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="reorder-input-path" placeholder="Select PDF file..." readonly>
+                                <button id="browse-reorder-input">Browse</button>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>New Page Order:</label>
+                            <input type="text" id="reorder-pages" placeholder="e.g., 3, 1, 2, 5, 4">
+                            <small>Enter page numbers in desired order, separated by commas</small>
+                        </div>
+                        <div class="export-section">
+                            <button id="load-current-order" type="button">Load Current Page Order</button>
+                            <div id="current-page-order" class="info-display hidden">
+                                Current order: <span id="current-order-display"></span>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>Output File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="reorder-output-path" placeholder="Choose output location..." readonly>
+                                <button id="browse-reorder-output">Browse</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <!-- Watermark Section -->
+                    <div id="pdf-watermark-section" class="pdf-operation-section hidden">
+                        <div class="export-section">
+                            <label>PDF File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="watermark-input-path" placeholder="Select PDF file..." readonly>
+                                <button id="browse-watermark-input">Browse</button>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>Watermark Text:</label>
+                            <input type="text" id="watermark-text" placeholder="Enter watermark text...">
+                        </div>
+                        <div class="export-section">
+                            <label>Font Size:</label>
+                            <input type="number" id="watermark-font-size" min="8" max="144" value="48" placeholder="48">
+                        </div>
+                        <div class="export-section">
+                            <label>Opacity (0-100):</label>
+                            <input type="range" id="watermark-opacity" min="0" max="100" value="30">
+                            <span id="watermark-opacity-value">30</span>
+                        </div>
+                        <div class="export-section">
+                            <label>Position:</label>
+                            <select id="watermark-position">
+                                <option value="center">Center</option>
+                                <option value="diagonal">Diagonal</option>
+                                <option value="top-left">Top Left</option>
+                                <option value="top-center">Top Center</option>
+                                <option value="top-right">Top Right</option>
+                                <option value="bottom-left">Bottom Left</option>
+                                <option value="bottom-center">Bottom Center</option>
+                                <option value="bottom-right">Bottom Right</option>
+                            </select>
+                        </div>
+                        <div class="export-section">
+                            <label>Color:</label>
+                            <input type="color" id="watermark-color" value="#000000">
+                        </div>
+                        <div class="export-section">
+                            <label>Apply to:</label>
+                            <select id="watermark-pages">
+                                <option value="all">All Pages</option>
+                                <option value="custom">Custom Pages</option>
+                            </select>
+                            <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>
+                            <div class="folder-input-group">
+                                <input type="text" id="watermark-output-path" placeholder="Choose output location..." readonly>
+                                <button id="browse-watermark-output">Browse</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <!-- Encrypt PDF Section (Password Protection) -->
+                    <div id="pdf-encrypt-section" class="pdf-operation-section hidden">
+                        <div class="export-section">
+                            <label>PDF File to Protect:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="encrypt-input-path" placeholder="Select PDF file..." readonly>
+                                <button id="browse-encrypt-input">Browse</button>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>User Password:</label>
+                            <input type="password" id="encrypt-user-password" placeholder="Password to open the PDF">
+                            <small>Required to open and view the PDF</small>
+                        </div>
+                        <div class="export-section">
+                            <label>Owner Password:</label>
+                            <input type="password" id="encrypt-owner-password" placeholder="Password to modify permissions">
+                            <small>Optional: Required to change document permissions</small>
+                        </div>
+                        <div class="export-section">
+                            <label>Encryption Level:</label>
+                            <select id="encrypt-level">
+                                <option value="128">128-bit (Standard)</option>
+                                <option value="256" selected>256-bit (High Security)</option>
+                            </select>
+                        </div>
+                        <div class="export-section">
+                            <label>Document Permissions:</label>
+                            <div class="checkbox-group">
+                                <label><input type="checkbox" id="encrypt-allow-printing" checked> Allow Printing</label>
+                                <label><input type="checkbox" id="encrypt-allow-modify" checked> Allow Content Modification</label>
+                                <label><input type="checkbox" id="encrypt-allow-copy" checked> Allow Content Copying</label>
+                                <label><input type="checkbox" id="encrypt-allow-annotate" checked> Allow Annotations</label>
+                                <label><input type="checkbox" id="encrypt-allow-forms" checked> Allow Form Filling</label>
+                                <label><input type="checkbox" id="encrypt-allow-extract" checked> Allow Accessibility (Screen Readers)</label>
+                                <label><input type="checkbox" id="encrypt-allow-assemble" checked> Allow Document Assembly</label>
+                                <label><input type="checkbox" id="encrypt-allow-print-high" checked> Allow High-Quality Printing</label>
+                            </div>
+                            <small>These permissions apply when owner password is set</small>
+                        </div>
+                        <div class="export-section">
+                            <label>Output File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="encrypt-output-path" placeholder="Choose output location..." readonly>
+                                <button id="browse-encrypt-output">Browse</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <!-- Decrypt PDF Section (Remove Password) -->
+                    <div id="pdf-decrypt-section" class="pdf-operation-section hidden">
+                        <div class="export-section">
+                            <label>Protected PDF File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="decrypt-input-path" placeholder="Select protected PDF file..." readonly>
+                                <button id="browse-decrypt-input">Browse</button>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>Current Password:</label>
+                            <input type="password" id="decrypt-password" placeholder="Enter PDF password">
+                            <small>Enter the password to unlock and remove protection</small>
+                        </div>
+                        <div class="export-section">
+                            <label>Output File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="decrypt-output-path" placeholder="Choose output location..." readonly>
+                                <button id="browse-decrypt-output">Browse</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <!-- Permissions Section -->
+                    <div id="pdf-permissions-section" class="pdf-operation-section hidden">
+                        <div class="export-section">
+                            <label>PDF File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="permissions-input-path" placeholder="Select PDF file..." readonly>
+                                <button id="browse-permissions-input">Browse</button>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>Current Password (if protected):</label>
+                            <input type="password" id="permissions-current-password" placeholder="Leave empty if not protected">
+                        </div>
+                        <div class="export-section">
+                            <label>New Owner Password:</label>
+                            <input type="password" id="permissions-owner-password" placeholder="Password to modify permissions">
+                            <small>Set a password required to change document permissions</small>
+                        </div>
+                        <div class="export-section">
+                            <label>Document Permissions:</label>
+                            <div class="checkbox-group">
+                                <label><input type="checkbox" id="permissions-allow-printing" checked> Allow Printing</label>
+                                <label><input type="checkbox" id="permissions-allow-modify" checked> Allow Content Modification</label>
+                                <label><input type="checkbox" id="permissions-allow-copy" checked> Allow Content Copying</label>
+                                <label><input type="checkbox" id="permissions-allow-annotate" checked> Allow Annotations</label>
+                                <label><input type="checkbox" id="permissions-allow-forms" checked> Allow Form Filling</label>
+                                <label><input type="checkbox" id="permissions-allow-extract" checked> Allow Accessibility (Screen Readers)</label>
+                                <label><input type="checkbox" id="permissions-allow-assemble" checked> Allow Document Assembly</label>
+                                <label><input type="checkbox" id="permissions-allow-print-high" checked> Allow High-Quality Printing</label>
+                            </div>
+                        </div>
+                        <div class="export-section">
+                            <label>Output File:</label>
+                            <div class="folder-input-group">
+                                <input type="text" id="permissions-output-path" placeholder="Choose output location..." readonly>
+                                <button id="browse-permissions-output">Browse</button>
+                            </div>
+                        </div>
+                    </div>
+
+                    <!-- Progress indicator -->
+                    <div id="pdf-progress" class="batch-progress hidden">
+                        <div class="progress-bar">
+                            <div class="progress-fill" id="pdf-progress-fill"></div>
+                        </div>
+                        <div class="progress-text">
+                            <span id="pdf-progress-text">Processing...</span>
+                        </div>
+                    </div>
+                </div>
+                <div class="export-dialog-footer">
+                    <button id="pdf-editor-cancel">Cancel</button>
+                    <button id="pdf-editor-process" class="primary">Process</button>
+                </div>
+            </div>
+        </div>
+
         <div class="editor-container">
-            <div id="editor-pane" class="pane">
+            <div class="tab-content active" id="tab-content-1" data-tab-id="1">
-                <textarea id="editor"></textarea>
+                <div id="editor-pane-1" class="pane">
+                    <div class="editor-wrapper">
+                        <div id="line-numbers-1" class="line-numbers hidden"></div>
+                        <textarea id="editor-1" class="editor-textarea"></textarea>
+                    </div>
+                </div>
+                <div id="preview-pane-1" class="pane">
+                    <div id="preview-1" class="preview-content"></div>
                 </div>
-            <div id="preview-pane" class="pane">
-                <div id="preview"></div>
             </div>
         </div>
         

src/styles-modern.css

@@ -0,0 +1,825 @@
+/* ========================================
+   PanConverter v1.7.1 - Modern UI
+   Glassmorphism, Gradients & Animations
+   ======================================== */
+
+/* Modern Color Palette */
+:root {
+  /* Primary Brand Colors - Purple-Blue Gradient */
+  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  --primary-light: #8b9aff;
+  --primary-dark: #5661b3;
+
+  /* Accent Colors */
+  --accent-green: #10b981;
+  --accent-blue: #3b82f6;
+  --accent-purple: #8b5cf6;
+  --accent-pink: #ec4899;
+
+  /* Neutral Colors */
+  --gray-50: #f9fafb;
+  --gray-100: #f3f4f6;
+  --gray-200: #e5e7eb;
+  --gray-300: #d1d5db;
+  --gray-400: #9ca3af;
+  --gray-500: #6b7280;
+  --gray-600: #4b5563;
+  --gray-700: #374151;
+  --gray-800: #1f2937;
+  --gray-900: #111827;
+
+  /* Glassmorphism */
+  --glass-bg: rgba(255, 255, 255, 0.7);
+  --glass-border: rgba(255, 255, 255, 0.18);
+  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
+
+  /* Effects */
+  --blur-amount: 10px;
+  --transition-speed: 0.3s;
+  --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+/* Reset & Base */
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+body {
+  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+  overflow: hidden;
+  height: 100vh;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
+  background-size: 200% 200%;
+  animation: gradientShift 15s ease infinite;
+  color: var(--gray-900);
+}
+
+@keyframes gradientShift {
+  0% { background-position: 0% 50%; }
+  50% { background-position: 100% 50%; }
+  100% { background-position: 0% 50%; }
+}
+
+.container {
+  display: flex;
+  flex-direction: column;
+  height: 100vh;
+  padding: 12px;
+  gap: 12px;
+}
+
+/* Glass Container for main content */
+.main-content-glass {
+  background: var(--glass-bg);
+  backdrop-filter: blur(var(--blur-amount));
+  -webkit-backdrop-filter: blur(var(--blur-amount));
+  border: 1px solid var(--glass-border);
+  border-radius: 20px;
+  box-shadow: var(--glass-shadow);
+  overflow: hidden;
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+}
+
+/* Tab Bar - Modern Glassmorphism */
+.tab-bar {
+  display: flex;
+  align-items: center;
+  background: rgba(255, 255, 255, 0.5);
+  backdrop-filter: blur(10px);
+  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
+  padding: 8px 12px;
+  min-height: 48px;
+  gap: 6px;
+}
+
+.tab {
+  display: flex;
+  align-items: center;
+  padding: 8px 16px;
+  background: rgba(255, 255, 255, 0.3);
+  backdrop-filter: blur(8px);
+  border: 1px solid rgba(255, 255, 255, 0.3);
+  border-radius: 12px;
+  margin-right: 4px;
+  cursor: pointer;
+  user-select: none;
+  max-width: 200px;
+  min-width: 120px;
+  transition: all var(--transition-speed) var(--transition-ease);
+  transform: translateY(0);
+}
+
+.tab:hover {
+  background: rgba(255, 255, 255, 0.5);
+  transform: translateY(-2px);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+}
+
+.tab.active {
+  background: linear-gradient(135deg, rgba(102, 126, 234, 0.9), rgba(118, 75, 162, 0.9));
+  color: white;
+  border-color: rgba(255, 255, 255, 0.5);
+  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
+  transform: translateY(-2px);
+}
+
+.tab-title {
+  flex: 1;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  font-size: 13px;
+  font-weight: 500;
+}
+
+.tab-close {
+  background: rgba(255, 255, 255, 0.2);
+  border: none;
+  font-size: 14px;
+  font-weight: bold;
+  cursor: pointer;
+  padding: 4px;
+  margin-left: 8px;
+  width: 20px;
+  height: 20px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 6px;
+  color: currentColor;
+  transition: all var(--transition-speed) var(--transition-ease);
+}
+
+.tab-close:hover {
+  background: rgba(255, 255, 255, 0.4);
+  transform: rotate(90deg);
+}
+
+.new-tab-button {
+  background: rgba(255, 255, 255, 0.3);
+  backdrop-filter: blur(8px);
+  border: 1px solid rgba(255, 255, 255, 0.3);
+  border-radius: 10px;
+  padding: 8px 16px;
+  cursor: pointer;
+  font-size: 14px;
+  font-weight: 500;
+  color: var(--gray-700);
+  transition: all var(--transition-speed) var(--transition-ease);
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+
+.new-tab-button:hover {
+  background: rgba(255, 255, 255, 0.5);
+  transform: scale(1.05);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+}
+
+/* Toolbar - Modern Gradient Buttons */
+.toolbar {
+  display: flex;
+  align-items: center;
+  padding: 10px 16px;
+  background: rgba(255, 255, 255, 0.4);
+  backdrop-filter: blur(10px);
+  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
+  gap: 6px;
+}
+
+.toolbar button {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 36px;
+  height: 36px;
+  border: 1px solid rgba(255, 255, 255, 0.3);
+  background: rgba(255, 255, 255, 0.3);
+  backdrop-filter: blur(8px);
+  border-radius: 10px;
+  cursor: pointer;
+  transition: all var(--transition-speed) var(--transition-ease);
+  color: var(--gray-700);
+}
+
+.toolbar button:hover {
+  background: var(--primary-gradient);
+  border-color: transparent;
+  color: white;
+  transform: translateY(-2px) scale(1.05);
+  box-shadow: 0 6px 16px rgba(102, 126, 234, 0.3);
+}
+
+.toolbar button:active {
+  transform: translateY(0) scale(0.98);
+}
+
+.toolbar-separator {
+  width: 1px;
+  height: 24px;
+  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.4), transparent);
+  margin: 0 8px;
+}
+
+/* Tab Content */
+.tab-content {
+  display: flex;
+  flex: 1;
+  overflow: hidden;
+}
+
+.tab-content:not(.active) {
+  display: none;
+}
+
+/* Editor Container */
+.editor-container {
+  display: flex;
+  flex: 1;
+  overflow: hidden;
+  background: rgba(255, 255, 255, 0.3);
+  backdrop-filter: blur(10px);
+  border-radius: 0 0 20px 20px;
+}
+
+.pane {
+  flex: 1;
+  overflow: auto;
+  min-width: 0;
+}
+
+.pane:first-child {
+  border-right: 1px solid rgba(255, 255, 255, 0.3);
+}
+
+/* Custom Scrollbar */
+.pane::-webkit-scrollbar,
+.editor-textarea::-webkit-scrollbar {
+  width: 10px;
+  height: 10px;
+}
+
+.pane::-webkit-scrollbar-track,
+.editor-textarea::-webkit-scrollbar-track {
+  background: rgba(255, 255, 255, 0.1);
+  border-radius: 10px;
+}
+
+.pane::-webkit-scrollbar-thumb,
+.editor-textarea::-webkit-scrollbar-thumb {
+  background: var(--primary-gradient);
+  border-radius: 10px;
+  border: 2px solid rgba(255, 255, 255, 0.2);
+}
+
+.pane::-webkit-scrollbar-thumb:hover,
+.editor-textarea::-webkit-scrollbar-thumb:hover {
+  background: linear-gradient(135deg, #8b9aff, #9d6fd8);
+}
+
+.editor-textarea {
+  width: 100%;
+  height: 100%;
+  padding: 24px;
+  font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', Monaco, 'Courier New', monospace;
+  font-size: 15px;
+  line-height: 1.7;
+  border: none;
+  outline: none;
+  resize: none;
+  background: transparent;
+  color: var(--gray-900);
+}
+
+.pane:last-child {
+  padding: 0;
+  background: rgba(255, 255, 255, 0.5);
+  backdrop-filter: blur(15px);
+}
+
+.preview-content {
+  max-width: none;
+  margin: 0;
+  padding: 24px 32px;
+  line-height: 1.8;
+  font-size: 15px;
+  color: var(--gray-900);
+}
+
+/* Status Bar - Glassmorphism */
+.status-bar {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 8px 20px;
+  background: rgba(255, 255, 255, 0.5);
+  backdrop-filter: blur(10px);
+  border-top: 1px solid rgba(255, 255, 255, 0.2);
+  border-radius: 0 0 20px 20px;
+  font-size: 12px;
+  color: var(--gray-600);
+  font-weight: 500;
+}
+
+/* Preview Styles - Modern Typography */
+.preview-content h1, .preview-content h2, .preview-content h3 {
+  background: var(--primary-gradient);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+  font-weight: 700;
+  margin-top: 28px;
+  margin-bottom: 16px;
+  line-height: 1.3;
+}
+
+.preview-content h1 {
+  font-size: 2.5em;
+  border-bottom: 3px solid;
+  border-image: var(--primary-gradient) 1;
+  padding-bottom: 12px;
+}
+
+.preview-content h2 {
+  font-size: 2em;
+  border-bottom: 2px solid rgba(102, 126, 234, 0.3);
+  padding-bottom: 10px;
+}
+
+.preview-content p {
+  margin-bottom: 18px;
+  line-height: 1.8;
+}
+
+.preview-content code {
+  padding: 3px 8px;
+  margin: 0 2px;
+  font-size: 90%;
+  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
+  border: 1px solid rgba(102, 126, 234, 0.2);
+  border-radius: 6px;
+  font-family: 'JetBrains Mono', 'Fira Code', monospace;
+  font-weight: 500;
+}
+
+.preview-content pre {
+  padding: 20px;
+  overflow-x: auto;
+  font-size: 14px;
+  line-height: 1.6;
+  background: rgba(255, 255, 255, 0.6);
+  backdrop-filter: blur(10px);
+  border: 1px solid rgba(102, 126, 234, 0.2);
+  border-radius: 12px;
+  margin-bottom: 20px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
+}
+
+.preview-content pre code {
+  background: transparent;
+  border: none;
+  padding: 0;
+  margin: 0;
+}
+
+.preview-content blockquote {
+  padding: 16px 20px;
+  color: var(--gray-700);
+  border-left: 4px solid;
+  border-image: var(--primary-gradient) 1;
+  margin-bottom: 20px;
+  background: rgba(255, 255, 255, 0.4);
+  backdrop-filter: blur(8px);
+  border-radius: 0 8px 8px 0;
+  font-style: italic;
+}
+
+.preview-content a {
+  color: #667eea;
+  text-decoration: none;
+  font-weight: 600;
+  position: relative;
+  transition: color var(--transition-speed);
+}
+
+.preview-content a::after {
+  content: '';
+  position: absolute;
+  left: 0;
+  bottom: -2px;
+  width: 0;
+  height: 2px;
+  background: var(--primary-gradient);
+  transition: width var(--transition-speed) var(--transition-ease);
+}
+
+.preview-content a:hover {
+  color: #764ba2;
+}
+
+.preview-content a:hover::after {
+  width: 100%;
+}
+
+.preview-content table {
+  border-collapse: separate;
+  border-spacing: 0;
+  margin-bottom: 20px;
+  width: 100%;
+  border-radius: 12px;
+  overflow: hidden;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
+}
+
+.preview-content table th,
+.preview-content table td {
+  padding: 12px 16px;
+  border: 1px solid rgba(102, 126, 234, 0.2);
+}
+
+.preview-content table th {
+  font-weight: 600;
+  background: var(--primary-gradient);
+  color: white;
+}
+
+.preview-content table tr:nth-child(even) {
+  background: rgba(255, 255, 255, 0.5);
+}
+
+/* Modern Dialogs */
+.export-dialog,
+.batch-dialog,
+.find-dialog-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: rgba(0, 0, 0, 0.4);
+  backdrop-filter: blur(8px);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+  animation: fadeIn 0.3s var(--transition-ease);
+}
+
+@keyframes fadeIn {
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
+}
+
+.export-dialog.hidden,
+.batch-dialog.hidden {
+  display: none;
+}
+
+.export-dialog-content,
+.batch-dialog-content {
+  background: rgba(255, 255, 255, 0.95);
+  backdrop-filter: blur(20px);
+  border: 1px solid rgba(255, 255, 255, 0.3);
+  border-radius: 20px;
+  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
+  width: 90%;
+  max-width: 650px;
+  max-height: 90vh;
+  overflow-y: auto;
+  animation: slideUpFade 0.4s var(--transition-ease);
+}
+
+@keyframes slideUpFade {
+  from {
+    opacity: 0;
+    transform: translateY(30px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+.export-dialog-header,
+.batch-dialog-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 20px 24px;
+  border-bottom: 1px solid rgba(102, 126, 234, 0.2);
+  background: var(--primary-gradient);
+  border-radius: 20px 20px 0 0;
+}
+
+.export-dialog-header h3,
+.batch-dialog-header h3 {
+  margin: 0;
+  font-size: 20px;
+  font-weight: 700;
+  color: white;
+}
+
+.export-dialog-body,
+.batch-dialog-body {
+  padding: 24px;
+}
+
+.export-section,
+.batch-section {
+  margin-bottom: 20px;
+}
+
+.export-section label,
+.batch-section label {
+  display: block;
+  font-weight: 600;
+  margin-bottom: 8px;
+  color: var(--gray-700);
+  font-size: 14px;
+}
+
+.export-section select,
+.export-section input,
+.batch-section select,
+.batch-section input {
+  width: 100%;
+  padding: 10px 14px;
+  border: 2px solid rgba(102, 126, 234, 0.2);
+  border-radius: 10px;
+  font-size: 14px;
+  background: rgba(255, 255, 255, 0.8);
+  backdrop-filter: blur(5px);
+  transition: all var(--transition-speed) var(--transition-ease);
+}
+
+.export-section select:focus,
+.export-section input:focus,
+.batch-section select:focus,
+.batch-section input:focus {
+  outline: none;
+  border-color: #667eea;
+  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
+  background: white;
+}
+
+/* Modern Buttons */
+.export-dialog-footer,
+.batch-dialog-footer {
+  display: flex;
+  justify-content: flex-end;
+  gap: 12px;
+  padding: 20px 24px;
+  border-top: 1px solid rgba(102, 126, 234, 0.2);
+  background: rgba(255, 255, 255, 0.5);
+  backdrop-filter: blur(10px);
+  border-radius: 0 0 20px 20px;
+}
+
+.export-dialog-footer button,
+.batch-dialog-footer button,
+.folder-input-group button {
+  padding: 10px 24px;
+  border: none;
+  border-radius: 10px;
+  cursor: pointer;
+  font-size: 14px;
+  font-weight: 600;
+  transition: all var(--transition-speed) var(--transition-ease);
+  position: relative;
+  overflow: hidden;
+}
+
+.export-dialog-footer button.primary,
+.batch-dialog-footer button.primary {
+  background: var(--primary-gradient);
+  color: white;
+  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
+}
+
+.export-dialog-footer button.primary:hover,
+.batch-dialog-footer button.primary:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
+}
+
+.export-dialog-footer button:not(.primary),
+.batch-dialog-footer button:not(.primary),
+.folder-input-group button {
+  background: rgba(255, 255, 255, 0.8);
+  color: var(--gray-700);
+  border: 2px solid rgba(102, 126, 234, 0.2);
+}
+
+.export-dialog-footer button:not(.primary):hover,
+.batch-dialog-footer button:not(.primary):hover,
+.folder-input-group button:hover {
+  background: white;
+  border-color: #667eea;
+  transform: translateY(-2px);
+}
+
+/* Find Dialog - Floating Modern */
+.find-dialog {
+  position: absolute;
+  top: 70px;
+  right: 24px;
+  background: rgba(255, 255, 255, 0.95);
+  backdrop-filter: blur(20px);
+  border: 1px solid rgba(255, 255, 255, 0.3);
+  border-radius: 16px;
+  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
+  z-index: 1000;
+  min-width: 420px;
+  padding: 16px;
+  animation: slideInRight 0.3s var(--transition-ease);
+}
+
+@keyframes slideInRight {
+  from {
+    opacity: 0;
+    transform: translateX(30px);
+  }
+  to {
+    opacity: 1;
+    transform: translateX(0);
+  }
+}
+
+.find-dialog.hidden {
+  display: none;
+}
+
+/* Progress Bars - Modern Gradient */
+.progress-bar {
+  width: 100%;
+  height: 8px;
+  background: rgba(102, 126, 234, 0.1);
+  border-radius: 10px;
+  overflow: hidden;
+  margin-bottom: 12px;
+}
+
+.progress-fill {
+  height: 100%;
+  background: var(--primary-gradient);
+  transition: width 0.4s var(--transition-ease);
+  width: 0%;
+  position: relative;
+  overflow: hidden;
+}
+
+.progress-fill::after {
+  content: '';
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: linear-gradient(90deg,
+    transparent,
+    rgba(255, 255, 255, 0.3),
+    transparent
+  );
+  animation: shimmer 2s infinite;
+}
+
+@keyframes shimmer {
+  0% {
+    transform: translateX(-100%);
+  }
+  100% {
+    transform: translateX(100%);
+  }
+}
+
+/* Auto-save Indicator - Modern */
+.auto-save-indicator {
+  position: fixed;
+  top: 24px;
+  right: 24px;
+  background: var(--primary-gradient);
+  color: white;
+  padding: 10px 20px;
+  border-radius: 12px;
+  font-size: 13px;
+  font-weight: 600;
+  z-index: 10000;
+  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
+  animation: slideInRight 0.3s ease-out;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.auto-save-indicator::before {
+  content: '✓';
+  display: inline-block;
+  width: 18px;
+  height: 18px;
+  background: white;
+  color: #667eea;
+  border-radius: 50%;
+  font-size: 12px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-weight: bold;
+}
+
+/* Enhanced Statistics - Modern */
+.enhanced-stats {
+  font-size: 11px;
+  color: var(--gray-600);
+  padding: 2px 0;
+  margin-left: 16px;
+  font-family: 'JetBrains Mono', monospace;
+  font-weight: 500;
+}
+
+/* Line Numbers - Modern */
+.line-numbers {
+  min-width: 50px;
+  padding: 12px 8px;
+  background: rgba(255, 255, 255, 0.3);
+  backdrop-filter: blur(8px);
+  border-right: 1px solid rgba(102, 126, 234, 0.2);
+  font-family: 'JetBrains Mono', monospace;
+  font-size: 13px;
+  line-height: 1.7;
+  color: var(--gray-500);
+  text-align: right;
+  user-select: none;
+  overflow: hidden;
+}
+
+.line-numbers.hidden {
+  display: none;
+}
+
+/* Animations & Transitions */
+.toolbar button,
+.tab,
+.new-tab-button,
+.export-dialog-footer button,
+.batch-dialog-footer button {
+  position: relative;
+  overflow: hidden;
+}
+
+.toolbar button::before,
+.tab::before,
+.new-tab-button::before {
+  content: '';
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  width: 0;
+  height: 0;
+  border-radius: 50%;
+  background: rgba(255, 255, 255, 0.4);
+  transform: translate(-50%, -50%);
+  transition: width 0.6s, height 0.6s;
+}
+
+.toolbar button:hover::before,
+.tab:hover::before,
+.new-tab-button:hover::before {
+  width: 200px;
+  height: 200px;
+}
+
+/* Responsive Design */
+@media (max-width: 768px) {
+  .container {
+    padding: 8px;
+    gap: 8px;
+  }
+
+  .export-dialog-content,
+  .batch-dialog-content {
+    max-width: 95%;
+  }
+
+  .find-dialog {
+    right: 12px;
+    min-width: 320px;
+  }
+}
+
+/* Hide default elements */
+.pane.hidden {
+  display: none;
+}
+
+.pane.full-width {
+  border-right: none;
+}

test-export-functionality.js

@@ -0,0 +1,49 @@
+// Test script to verify export functionality
+const { exec } = require('child_process');
+const fs = require('fs');
+const path = require('path');
+
+console.log('Testing export functionality...');
+
+// Test 1: Check if pandoc is available
+console.log('\n1. Checking Pandoc availability...');
+exec('pandoc --version', (error, stdout, stderr) => {
+  if (error) {
+    console.log('❌ Pandoc not available:', error.message);
+    console.log('✅ Built-in HTML and PDF export should work');
+  } else {
+    console.log('✅ Pandoc is available');
+    console.log('   Version info:', stdout.split('\n')[0]);
+  }
+});
+
+// Test 2: Check if test markdown file exists
+console.log('\n2. Checking test file...');
+const testFile = path.join(__dirname, 'test-export.md');
+if (fs.existsSync(testFile)) {
+  console.log('✅ Test markdown file exists:', testFile);
+  const content = fs.readFileSync(testFile, 'utf8');
+  console.log('   File size:', content.length, 'characters');
+} else {
+  console.log('❌ Test markdown file not found');
+}
+
+// Test 3: Check marked library
+console.log('\n3. Testing marked library...');
+try {
+  const marked = require('marked');
+  const testMarkdown = '# Test\nThis is a **test** markdown.';
+  const html = marked.parse(testMarkdown);
+  console.log('✅ Marked library working');
+  console.log('   Sample output:', html.substring(0, 50) + '...');
+} catch (error) {
+  console.log('❌ Marked library error:', error.message);
+}
+
+console.log('\n✅ Export functionality test completed!');
+console.log('\nHow to test exports:');
+console.log('1. Open the application');
+console.log('2. Open test-export.md file');
+console.log('3. Try exporting to HTML (should work without Pandoc)');
+console.log('4. Try exporting to PDF (should work without Pandoc)');
+console.log('5. Try exporting to DOCX (requires Pandoc)');

test-export.md

@@ -0,0 +1,26 @@
+# Test Document
+
+This is a test markdown document for export testing.
+
+## Features
+
+- **Bold text**
+- *Italic text*
+- [Links](https://example.com)
+
+## Code Example
+
+```javascript
+function hello() {
+    console.log("Hello World!");
+}
+```
+
+## Table
+
+| Column 1 | Column 2 | Column 3 |
+|----------|----------|----------|
+| Value 1  | Value 2  | Value 3  |
+| Value 4  | Value 5  | Value 6  |
+
+This is a test document to verify export functionality.

test.md

@@ -0,0 +1,23 @@
+# Test Document
+
+This is a **test** markdown document.
+
+## Features
+
+- Item 1
+- Item 2
+- Item 3
+
+### Code Example
+
+```javascript
+console.log("Hello World");
+```
+
+> Tqweqweqweqweqweqweqeweqweqweqwe
+dfe
+
+qwe
+qwe
+qwe
+qwe