docs/EN/MARKDOWN_VIDEO_PLAN.md



Markdown-to-Video Roadmap

Vision

• Markdown-to-Video Generator: Write markdown, export video—powered entirely by native web technologies
• Markdown controls everything: Content, timing, transitions, templates, and visual styling all defined in .md files
• Self-contained architecture: Built on Electron + native Web APIs (Canvas, MediaRecorder, Web Audio, File System)
• Flexible slide creation: Multiple slide break modes (--- separators, # H1 headers, ## H2 headers, or auto-detection)

Core Philosophy: Markdown as Video Source

• Input: Markdown file with YAML frontmatter for video configuration
• Parser: Custom MarkdownParser extracts slides, metadata, and asset references
• Renderer: Canvas-based slide compositor using HTML/CSS → Canvas 2D API
• Encoder: Native MediaRecorder API generates WebM video streams today, with planned OS-level pipelines (Media Foundation, AVFoundation, GStreamer) delivering MP4/GIF output without third-party libraries
• Export: Files saved via secure IPC bridge with path validation

Guiding Principles

• Markdown-first workflow: Deck authoring, timeline preview, and video export driven by .md source
• Native APIs only: MediaRecorder (video encoding), Canvas 2D (rendering), Web Audio (future audio mixing)
• Preview = Export fidelity: Same timeline engine powers live preview and final video output
• Security-first: All file I/O flows through security-core.js with path validation and rate limiting
• Zero-config experience: Sensible defaults with frontmatter-based overrides and shareable presentation presets

Completed Foundation

• Markdown-to-HTML pipeline in the Electron renderer.
• Baseline slide templates, theming, and live preview.
• Project structure separating main, renderer, and shared modules.
• Refactored renderer UI (src/renderer/index.html) into a markdown-first workflow with restored Templates tab.
• Comprehensive Markdown Syntax Dictionary (markdown-syntax.js) - 50+ patterns supporting CommonMark + GFM
• Auto-pagination System (slide-paginator.js) - Intelligent slide splitting based on visual line count (max 6 lines/slide)
• Interactive Preview Controls - Pause/resume with click, Space, P, ESC keyboard shortcuts
• Dark Blue Theme - Complete UI redesign with cohesive color scheme (#0a1628 background, #3b82f6 primary)

Immediate Sprint Focus (Current Work)

Phase 1: Core Functionality (COMPLETED)

• Rebuild src/renderer/js/app.js – Complete renderer controller:

  • Parse markdown via MarkdownParser when user clicks "Sync Markdown"
  • Extract frontmatter (template, video.*, theme.accent) and body content
  • Generate slide array with auto-calculated durations based on content density
  • Populate Timeline tab with per-slide timings, page indicators, line counts, and duration
  • Update stage preview rendering with full markdown syntax support
  • Apply selected template and accent color to CSS variables
  • Enable Preview Timeline with pause/resume controls (click, Space, P, ESC)
  • Full support for 15+ content types (H1-H6, lists, tables, blockquotes, code, HTML, etc.)
  • Continuation markers for paginated slides ("↪ continued", "continues →")
  • Page indicators in top-right corner of slides

• Extend src/shared/markdown-parser.js to:

  • Emit scene-level metadata including slide index, title, subtitle, and content items
  • Calculate per-slide durations using heuristics (H1=2s, list items=1s each, text=0.3s per word, code=0.5s per line)
  • Support frontmatter parsing for template ID, video settings, and custom metadata
  • Return asset references (images from ![alt](src) syntax) for checklist validation
  • Provide getSummary() method returning totalSlides, paginatedSlides, estimatedDuration, and titles
  • NEW: Integration with MarkdownSyntax dictionary for comprehensive pattern recognition
  • NEW: Auto-pagination support with enablePagination and maxLinesPerSlide options
  • NEW: Visual line tracking - slides include visualLines, totalPages, pageNumber properties

• Wire template selection bidirectionally:

  • Clicking a template card in Templates tab updates state.template
  • Upsert template: <id> into markdown frontmatter via upsertFrontmatterValue()
  • Trigger syncMarkdown() to refresh timeline and reapply template CSS
  • Show active template name in "Active template:" hint label

• Surface validation diagnostics:

  • Show/hide markdownDiagnostics panel based on parse success/failure
  • Display human-friendly error messages (e.g., "Missing closing frontmatter delimiter", "Invalid slide structure")
  • Highlight unsynced state when editor content changes before next sync
  • Clear diagnostics automatically on successful sync

New Features Completed Beyond Original Scope

1. Comprehensive Markdown Syntax Dictionary (src/shared/markdown-syntax.js)

• 50+ regex patterns covering CommonMark + GitHub Flavored Markdown
• Block-level syntax: ATX headings (# to ######), Setext headings (underlines), unordered lists (-, *, +), ordered lists, task lists, code blocks (fenced and indented), tables, blockquotes, horizontal rules, HTML blocks
• Inline syntax: bold (text), italic (text), strikethrough (text), inline code (code), links, images
• Special syntax: YAML frontmatter, footnotes, math blocks (LaTeX)
• API: detectBlockType(line, nextLine) and parseInline(text) methods
• Documentation: MARKDOWN_SYNTAX.md (EN/TH) with complete syntax reference

2. Auto-pagination System (src/shared/slide-paginator.js)

Status: Needs Integration with Presentation Rendering - Currently standalone, not yet used in actual rendering

• Visual line calculation with content-specific weights:
  • H1 = 2.5 lines, H2 = 2 lines, H3-H6 = 1.5-1 lines
  • List/blockquote items = 1.2 lines each
  • Code blocks = 1 line per line (more readable)
  • Tables = 2.5 (header) + rows × 0.8
  • Images = 4 lines, HTML = 3 lines
• Intelligent splitting algorithms:
  • Balanced page distribution (30% threshold)
  • Smart block splitting for code, tables, blockquotes
  • Atomic blocks (images, HTML, HR) never split
  • Continuation markers automatically added
• API: applyPagination(slides, config) returns paginated slide array
• Documentation: AUTO_PAGINATION.md (EN/TH) with examples and algorithm details

Required Work:

• Integrate with Smart Layout Engine: Use line calculation logic with ensureContentWithinBounds()
• Integrate with Slide Renderer: Make slides split automatically during actual rendering, not just parsing
• Configure via Presentation Settings: Add maxLinesPerSlide to presentation-config.js
• Work with Safe Zones: Calculate actual available space before splitting slides

3. Interactive Preview Controls

• Pause/resume mechanism:
  • Click anywhere on preview stage to pause/resume (preview mode only)
  • Keyboard shortcuts: Space or P to toggle, ESC to stop preview
  • Promise-based waiting with 100ms polling for instant response

4. Presentation Mode (PowerPoint-style Navigation)

• Manual slide navigation with forward/back controls:
  • "Presentation Mode" button alongside main controls
  • Left/Right arrow buttons for navigation
  • Keyboard shortcuts: ← → for prev/next, Space for next, Home/End for first/last
  • Slide counter display (e.g., "1 / 15")
  • ESC to exit presentation mode
• Fullscreen support:
  • Fullscreen button in top-right corner during presentation
  • F key toggle for fullscreen
  • Proper fullscreen styling (borderless, full viewport)
• Visual design:
  • Semi-transparent navigation controls at bottom center
  • Circular prev/next buttons with hover effects
  • Disabled state for first/last slide boundaries
  • Backdrop blur for better readability

5. Application Reset Function

• Reset Button after Export Video
  • Reset application to initial state
  • Clear all markdown content and slides
  • Reset all settings to defaults
  • Confirmation dialog before execution
  • Automatically stop playback or presentation
  • Reset template to 'modern'
  • Clear timeline and asset checklist

6. Programmer's PowerPoint - Code Editor Themes

• New Code Editor Style Themes in templates.js:
  • Monokai: Classic theme with warm tones (magenta, green, cyan)
  • Solarized Dark: Precision colors designed for readability
  • SynthWave '84: Retro futuristic 80s aesthetic (hot pink, mint, yellow)
  • Dracula: Dark theme for night coders
  • Full syntax highlighting support with theme-specific colors
• Enhanced Content Styles in style.css:
  • .content-h1: Gradient text with glow effect
  • .content-h2: Border-left accent with text shadow
  • .content-blockquote: Styled quote marks with inset shadow
  • .content-code-block: Top gradient border with hover animation
  • Syntax highlighting colors: keyword, string, number, comment, function, variable
• Advanced Transitions in slide-renderer.js:
  • Glitch: Digital glitch effect with random offsets and hue rotation
  • Matrix: Digital rain effect simulation
  • Cube: 3D cube rotation transition
  • Pixelate: Blur-based pixelation effect
• CSS Animations:
  • @keyframes matrixScroll: Scrolling matrix effect
  • @keyframes glitchSkew: Skew animation for glitch
  • @keyframes pixelateIn: Blur in animation
  • @keyframes codeHighlight: Code block hover glow
  • @keyframes textGlow: Heading pulsing glow effect
• Visual feedback:
  • Pause overlay with semi-transparent backdrop (blur 8px)
  • Large pause icon with pulse animation
  • Instructions: "Paused" text + keyboard hints
  • Z-index 1000 for always-on-top display
• State management:
  • isPaused boolean flag
  • pauseResolve function reference for promise resolution
  • Cleanup on preview stop
• Documentation: PREVIEW_CONTROLS.md (EN/TH) with usage guide

7. Enhanced Timeline Visualization

• Pagination indicators: Show "[1/2]", "[2/2]" badges for multi-page slides
• Line count display: "8 lines", "5 lines" to show content density
• Continuation indicators: "↪ continued" for split content
• Duration display: Accurate timing per slide with total duration

8. Smart Layout Measurement & Safe Zones

• Introduced shared SMART_SAFE_ZONE heuristics and padding helpers to derive consistent insets for measurement and stage rendering
• Synced typography, screen-type classes, and scene structure between the hidden measurement stage and the live stage frame
• Reused measurement-stage results to auto-scale overflowing content while keeping metadata (data-safe-*) available for diagnostics
• Filtered preview carry-over to exclude heading blocks and rely on authored titles instead of synthetic "Slide N" labels

9. Presentation Configuration System (src/renderer/js/presentation-config.js)

• Replaced rigid template catalogue with flexible presentation settings presets (fonts, clamp sizes, colors, backgrounds, animations)
• Introduced configuration API (getCurrentConfig, setConfig, updateConfigPart, loadPreset, resetConfig) for fine-grained control
• Defined curated preset families (Default, Professional, Minimal, Creative) plus font/background/transition option catalogs
• Auto-applies presentation variables to CSS custom properties (fonts, font sizes, colors, safe spacing) without external libraries
• Supports JSON import/export for sharing configuration profiles across markdown decks
• Typography & Layout Controls - Complete document formatting system:
  • Font size controls (H1, H2, Body Text) with responsive clamp (min, base vw, max)
  • Line height adjustments (heading, body) for optimal readability
  • Paragraph spacing controls (before/after) in rem units
  • Heading spacing controls (before/after) for visual hierarchy
  • Indentation controls (first-line, blockquote) for document structure
  • List indent and text alignment options (left, center, right, justify)
• UI & Visual Effects Configuration:
  • Preview slide opacity control (0-1 range)
  • Pause overlay blur effect (px)
  • Navigation button border width (px)
  • Gradient backdrop effects (spread %, blur px)
• Border & Accent Width Controls:
  • Heading accent border width (H2 left border)
  • Blockquote border width (left accent line)
  • Image border width (frame around images)
  • Link underline thickness
  • Table border width (grid lines)
  • Horizontal rule (HR) border width
• Single Source of Truth Architecture:
  • All default values centralized in CONFIG_PRESETS.default.config
  • CSS variables dynamically applied via applyConfigToDOM()
  • Live preview with instant feedback on all changes
  • Bidirectional sync between UI controls and configuration
  • Frontmatter persistence (save/load all settings to markdown YAML)
• Developer Experience:
  • Zero hardcoded values in CSS or JavaScript
  • Maintainable: change one config value, updates everywhere
  • Extensible: easy to add new styling properties
  • Type-safe: clear property structure with fallback values

Demo Files Created

• workspace/complete-syntax-demo.md - 25 slides demonstrating all Markdown syntax patterns
• workspace/pagination-demo.md - 20+ slides showing auto-pagination with various content lengths

Latest Updates (October 2025)

10. Mode Isolation System (Exclusive Mode Switching)

Problem Identified: UI elements from different modes were overlapping and causing conflicts in display and functionality

Solution - Built a comprehensive exclusive mode switching system:

Mode Manager (src/renderer/js/mode-manager.js)

• Singleton Pattern: Created ModeManager class with single instance for entire app
• 3 Strictly Separated Modes:
  • Intro Mode: Initial screen with no systems active (static display only)
  • Presentation Mode: Presentation mode with keyboard navigation + Smart Layout only
  • Editor Mode: Edit mode with content editable + drag & drop + Safe Zone border only

Robust Control System

• System Flags Tracking: Monitors active systems (smartLayout, dragDrop, contentEditable, safeZoneBorder, etc.)
• UI Visibility Control:
  • hideAllModeUI() - Hides all UI elements from all modes
  • showPresentationUI() - Shows only navigation controls, exit button, fullscreen button, edit button
  • showEditorUI() - Shows only save button, cancel button, exit button
• Smart Layout Management:
  • Intro Mode: detach() observers completely
  • Presentation Mode: reattach() observers for auto-adjustment
  • Editor Mode: detach() observers to prevent resizing during editing
• Mode Switching Flow:

  switchMode(newMode) {
    1. shutdownMode(currentMode)  // Shutdown old mode completely
    2. currentMode = newMode       // Change mode
    3. setDisplayMode(newMode)     // Update config
    4. activateMode(newMode)       // Activate new mode exclusively
    5. dispatch 'modeChanged' event
  }
  

Integration with Existing Systems

• app.js Integration:

  • init(): Calls switchToIntroMode() instead of setDisplayMode('intro')
  • startPresentationMode(): Calls switchToPresentationMode()
  • exitPresentationMode(): Calls switchToIntroMode()
  • Removed all manual UI show/hide logic (Mode Manager handles it)

• slide-editor.js Integration:

  • enterEditMode(): Calls switchToEditorMode()
  • exitEditMode(): Calls switchToPresentationMode()
  • enterDragMode(): Calls switchToEditorMode()
  • exitDragMode(): Calls switchToPresentationMode()
  • Removed manual Smart Layout detach/reattach (Mode Manager handles it)
  • Removed manual Safe Zone show/hide (Mode Manager handles it)

Smart Layout Protection

• Guard in ensureContentWithinBounds():

  function ensureContentWithinBounds() {
    const modeManager = getModeManager();
    if (modeManager && !modeManager.isSystemActive('smartLayout')) {
      return; // Don't execute if Smart Layout is disabled
    }
    // ... continue with calculations
  }
  

Results

• No UI Overlap: Each mode shows only its relevant UI elements
• No Smart Layout Interference: Auto-sizing only works in Presentation Mode
• Safe Edit Mode: Editing works without interference from other systems
• Single Source of Control: ModeManager is the only controller for all modes

Documentation and Maintenance

• Created docs/TH/MODE_ISOLATION_FIX.md with detailed fix documentation
• Added code comments indicating "Mode Manager handles this - no manual control needed"
• Removed redundant code from app.js and slide-editor.js

Strict Separation of 3 Display Logic Systems

Complete Separation of Three Display Logic Systems

Principle: Each display mode has completely separate logic and Safe Zone systems to prevent modifications in one area from breaking others.

1. Intro Scene System (Small Preview with UI Sidebar)

• Purpose: Display slide previews in a small area of the UI page with side control panels
• Characteristics:
  • Fixed screen size (1280x720 fallback)
  • Hard-coded Safe Zone optimized for small display area
  • No dynamic calculation needed due to fixed dimensions
• Core Functions (marked LOCKED - do not modify):
  • getStagePreviewData() - Extract slide preview data
  • renderStagePreview() - Render preview to DOM
  • updateStagePreview() - Update preview when slides change
• Status: Working perfectly - do not modify or link to other modes

2. Presentation Mode - Small Screen (Normal Size Presentation)

• Purpose: Presentation mode on standard screens (not fullscreen) at 1920x1080 or smaller
• Characteristics:
  • Supports navigation with arrow keys (← →)
  • Ratio-based Safe Zone calculation for standard screens
  • Safe boundaries approximately 8-9% of width/height
• Color Zones:
  • Red Zone: Area outside screen bounds - no content allowed
  • Green Zone: Safe area inside boundaries - content safe here
• Calculation:
  • No hard-coded pixels
  • Calculated from actual screen size ratio
  • Formula: safeInset = screenDimension × SAFE_ZONE_RATIO

3. Presentation Mode - Large Screen (Full Screen Large Display)

• Purpose: Fullscreen mode on large screens (2560x1440+) or projectors
• Characteristics:
  • Automatic fullscreen mode entry
  • Smart Layout Engine measures and optimizes content for available space
  • Wider Safe Zone to accommodate projector overscan
• Color Zones (stricter than small screens):
  • Red Zone: Danger area 10-15% from edge - absolutely no content
  • Yellow Zone: Warning area 5-10% - content may be cut on some projectors
  • Green Zone: Safe area 80% center - content displays confidently
• Calculation:
  • Dynamic calculation from actual screen size
  • Ratio adjusts based on screen type (normal/large/ultra)
  • Example formula:

    baseRatio = 0.08 (8%)
    maxRatio = 0.16 (16%)
    actualInset = clamp(screenSize × baseRatio, MIN_PIXELS, screenSize × maxRatio)
    

Code Protection from Modifications

• Added warning comments to all Intro Scene related functions
• Used clear @LOCKED and DO NOT MODIFY tags
• Separated comments into large blocks with border lines (==== lines)
• Specified reasons and impacts of modifications in comments
• No emojis in comments (may cause encoding issues)

Smart Layout and Safe Zone System

• Separated Safe Zone constants for each mode
• Intro Scene uses hard-coded constants
• Presentation Mode will create separate calculation functions
• Create computePresentationSafeZone() for presentation mode
• Create computeLargeScreenSafeZone() for large screens
• Test Safe Zone calculations on multiple screen sizes

Outstanding Work

Smart Layout Engine

• Integrate Auto-pagination with Smart Layout:
  • Use line calculation logic from slide-paginator.js with ensureContentWithinBounds()
  • Make slides split automatically during actual rendering, not just parsing
  • Calculate available space within Safe Zones before deciding to split pages
  • Add maxLinesPerSlide configuration to presentation-config.js
• Rebuild layout-schema.js with a durable LayoutNode model and accurate per-section metrics aggregation
• Feed the layout tree into renderSlideToStage so DOM output follows block semantics instead of raw HTML
• Extend the measurement stage to consume layout tree data and refactor line/column calculations
• Add unit tests covering smart layout behaviours (observers, smart-list balancing, layout tree diffing)

Cross-module Coordination (Markdown → Layout → Renderer)

• Author a layout-contract.md document defining the shared JSON schema for slides/sections/blocks/inlines plus diagnostics
• Refine markdown-syntax.js so it exposes a single detection/tokenization API and stores the metadata the parser requires
• Update markdown-parser.js to consume that metadata and emit content items ready to map directly into layout blocks (e.g., link, inline emphasis)
• Extend layout-schema.js to cover additional block types (heading, link, rich inline text) with metrics the renderer can consume immediately
• Rework app.js to render purely from the layout tree, return measurement/diagnostic updates into the tree, and surface state changes to the UI
• Introduce a feedback loop (diagnostics channel) between measurement stage ↔ layout-schema ↔ markdown-parser so heuristics can adapt

Timeline & Metadata Model

• Extend markdown frontmatter for per-slide timing, transitions, narration cues, and media assets.
• Generate a shared timeline model (scenes, tracks, assets) for preview and export.
• Implement validation with actionable errors for missing or invalid metadata.

Presentation Settings System (Template Replacement) - COMPLETED

• Replace template cards UI with configurable presentation presets powered by presentation-config.js
• Round-trip presentation settings to markdown frontmatter (fonts, colors, animation choices)
• Expose granular controls (font families, clamp ranges, backgrounds, borders, effects) with live preview updates
• Update parser/exporter to consume presentation settings instead of legacy template identifiers
• Complete Word/Excel-style Document Formatting:
  • 11 UI controls for styling properties (borders, effects, visual elements)
  • Typography controls (8 inputs for spacing, indentation, alignment)
  • Font size controls (9 inputs for H1, H2, Text with min/base/max)
  • Line height controls (2 inputs for heading and body)
  • All settings saved to frontmatter with presentation.styles.* namespace
  • Full English translation of all UI labels and preset descriptions

Phase 2: Enhanced Export (Next Priority)

• Browser preview consumes timeline model flawlessly with full markdown rendering
• Improve native WebM export quality:
  • Enhanced MediaRecorder API with frame-perfect timing control
  • Quality/bitrate configuration options (target: 1080p at 5-10 Mbps)
  • Progress reporting with per-slide render updates and percentage display
  • Abort/cancel functionality for long renders
• Add a render job manager handling queueing, progress reporting, and cancellations
• Export progress modal with real-time preview thumbnails

Visual Enhancements

• Support slide-specific background images/videos with aspect-ratio aware cropping.
• Introduce a declarative animation DSL covering transitions, text motion, and keyframed positioning.
• Build custom components (no external libraries):
  • Chart renderer using Canvas 2D API
  • Syntax highlighter using regex tokenization
  • Component registry for extensible markdown → visual mappings

Audio & Narration (Future)

• Support synchronized narration tracks sourced from audio files.
• Mix audio using native Web Audio API:
  • Build custom ducking algorithm for background music
  • Synchronize audio with video timeline
  • No external audio processing libraries
• Add scenario tests validating audio/video sync quality.

Collaboration & Templates

• Ship selectable markdown + CSS template packs within the UI.
• Provide a shared asset workspace with versioned references.
• Define naming conventions and folder layout for video-safe media assets.

Phased Implementation Plan

Phase 1 – Timeline Core (COMPLETED)

• Rebuild app.js to parse markdown and populate timeline UI
• Extend markdown-parser.js with frontmatter and duration heuristics
• Wire bidirectional template selection (UI ↔ frontmatter)
• Surface validation diagnostics in Markdown tab
• BONUS: Comprehensive Markdown Syntax Dictionary with 50+ patterns
• BONUS: Auto-pagination system with visual line calculation
• BONUS: Interactive preview controls (pause/resume, keyboard shortcuts)
• BONUS: Enhanced timeline visualization with pagination indicators and line metrics
• BONUS: Presentation mode with navigation controls and fullscreen support
• BONUS: Application reset workflow and safeguarded smart layout safe zones
• BONUS: Code editor themed styling plus advanced transitions/animations
• BONUS: Template-free presentation configuration system with shareable presets
• Add unit tests for parsing, timing calculations, and error cases (deferred to Phase 2)

Phase 2 – Enhanced Video Export (Next Priority)

• Improve MediaRecorder-based WebM export quality and frame timing (target: 1080p @ 5-10 Mbps)
• Implement native render progress tracking with per-slide updates and percentage display
• Add resolution/FPS/quality controls synced to frontmatter
• Support abort/cancel during export with cleanup and partial file deletion
• Export progress modal with live thumbnail preview
• Unit tests for markdown-syntax.js, slide-paginator.js, pause/resume mechanism
• Create integration tests for sample deck → video output

Native OS Encoding Roadmap (Security-first, No Third-party Libraries)

• Design shared frame extraction pipeline (HTML → RGBA buffers/PNG frames) compatible with all native encoders
• Windows: implement a sealed Media Foundation bridge that writes H.264/AAC MP4 via sandboxed worker process
• macOS: build an AVFoundation exporter (AVAssetWriter) for H.264/AAC MP4 with strict file-path validation
• Linux: integrate system GStreamer/VA-API pipeline (appsrc → x264enc → mp4mux) executed under security-core supervision
• Add GIF output using the same native pipelines (MF Transform, AVFoundation ImageDestination, or GStreamer gifenc)
• Instrument security hooks (path allow-list, rate limits, checksum validation) for every native encoder invocation

Phase 3 – Audio Integration (Future)

• Parse narration file references from slide metadata
• Load and validate audio assets via secure IPC
• Mix narration + background music using Web Audio API
• Synchronize audio with video timeline during preview and export
• Add waveform visualization in Timeline tab

Phase 4 – Visual Enhancements (Future)

• Build custom chart renderer (Canvas-based, no libraries)
• Implement syntax highlighter using regex tokenization
• Support slide-specific background images/videos
• Create declarative animation DSL for keyframe-based transitions
• Add component registry for extensible markdown → visual mappings

Phase 5 – Stabilization & Polish (Future)

• Performance profiling and asset caching optimization
• Improve error messages with contextual fix suggestions
• Documentation refresh with video tutorials
• Ship sample markdown decks demonstrating all features

Architecture Impact

• [x] Extended src/shared/markdown-parser.js: Emits timeline JSON with scene metadata, durations, asset references, pagination info
• [x] NEW src/shared/markdown-syntax.js: Dictionary-based pattern library with 50+ regex patterns for all CommonMark + GFM syntax
• [x] NEW src/shared/slide-paginator.js: Visual line calculation and intelligent slide splitting with content-aware algorithms
• New src/shared/timeline-engine.js: Compose timeline model, calculate timecodes, manage playback state (future)
• [x] Updated src/renderer/js/app.js: Consumes parsed markdown for preview with pause/resume, timeline population, full syntax rendering, 13 new DOM references for styling controls, frontmatter save/load for all styling properties
• [x] Enhanced src/renderer/js/video-renderer.js: Canvas-based slide rendering with full markdown support (export ready, quality enhancement pending)
• [x] Secure asset workspace: Standardized workspace/ folder with demo files and emoji-cleaner.js
• [x] NEW src/renderer/js/presentation-config.js: Centralised presentation settings engine replacing fixed templates with 30+ configurable properties, CSS variable system, and frontmatter integration
• [x] Enhanced src/renderer/css/style.css: Converted all hardcoded values to CSS variables (23+ new variables), added .slide-table, .slide-hr, .timeline-page-indicator classes for consistent theming
• [x] Updated src/renderer/index.html: Added 30+ new UI controls organized in 3 sections (UI Effects, Border Widths, Typography), full English translation, improved help text

Current Technology Stack (Updated)

• Electron 28.0.0: Desktop application framework
• MediaRecorder API: Native WebM video encoding (VP8/VP9 codec)
• Planned native encoders: Windows Media Foundation, macOS AVFoundation, Linux GStreamer/VA-API (system-provided, no third-party libraries)
• Canvas 2D API: Slide rendering from HTML/CSS → Canvas with full markdown syntax support
• Tailwind CSS (local - 407KB): UI styling loaded from src/renderer/vendor/tailwind.js
• Web Audio API (future): Native audio mixing and ducking
• Custom Modules:
  • MarkdownParser (src/shared/markdown-parser.js) - Parser with frontmatter, duration heuristics, pagination integration
  • MarkdownSyntax (src/shared/markdown-syntax.js) - Pattern dictionary with 50+ regex for CommonMark + GFM
  • SlidePaginator (src/shared/slide-paginator.js) - Visual line calculation and intelligent splitting
  • VideoRenderer (src/renderer/js/video-renderer.js) - Canvas-based slide rendering
  • PresentationConfig (src/renderer/js/presentation-config.js) - Template-free configuration presets and runtime styling engine
  • SecurityCore (src/shared/security-core.js) - Path validation and rate limiting for file operations

Quality Strategy

• Unit tests for markdown-syntax.js (pattern detection, inline parsing)
• Unit tests for slide-paginator.js (line calculation, splitting algorithms)
• Unit tests for markdown-parser.js (parsing, frontmatter, duration calculation, pagination integration)
• Integration tests for markdown → timeline → video workflow
• Snapshot tests for rendered HTML structures
• Manual QA checklist for export quality across resolutions/FPS
• Error handling validation (missing files, invalid frontmatter, etc.)
• Pause/resume mechanism tests (promise resolution, keyboard shortcuts)

Documentation & Adoption

• Produce bilingual guides: Created 6 comprehensive documentation files
  • MARKDOWN_SYNTAX.md (EN/TH) - Complete syntax reference with examples
  • AUTO_PAGINATION.md (EN/TH) - Pagination system guide with algorithms
  • PREVIEW_CONTROLS.md (EN/TH) - Interactive controls usage guide
• Publish sample decks: Created demo markdown files
  • workspace/complete-syntax-demo.md - 25 slides demonstrating all syntax patterns
  • workspace/pagination-demo.md - 20+ slides showing auto-pagination
• Schedule user testing sessions and collect feedback for iterative refinement
• Produce video tutorials for export workflows and troubleshooting