docs: add comprehensive implementation plan for unit conversion app

Add detailed implementation plan covering: - Innovative UX features (real-time conversion, visual comparison, power user features) - Technical architecture with Next.js 16, TypeScript, and Tailwind CSS 4 - Component structure and state management design - 8-phase implementation roadmap - Design system with category-based color palette - Support for 13+ unit categories from convert-units library - Performance targets and accessibility requirements - Mobile-first responsive design strategy 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
2025-11-08 09:09:16 +01:00
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+# Unit Conversion App - Implementation Plan
+
+## Project Overview
+
+A spectacular, innovative unit conversion application built with modern web technologies to provide the best user experience for converting between various measurement units.
+
+**Tech Stack:**
+- Next.js 16
+- TypeScript
+- Tailwind CSS 4
+- convert-units library
+- Static Site Generation
+
+## Innovative UX Features
+
+### 1. Real-time Bidirectional Conversion
+- As you type in one field, all other compatible units update instantly
+- No "convert" button needed - everything is live
+- Smooth, debounced updates for performance
+
+### 2. Smart Context-Aware Interface
+- Auto-detect measurement type from input
+- Suggest most relevant units based on context
+- Fuzzy search: type "kilo" → finds "kilogram", "kilometer"
+- Intelligent unit suggestions based on user's location/preferences
+
+### 3. Visual Comparison
+- Show visual representations (bars, icons) to understand magnitude differences
+- Animated transitions between conversions
+- Color-coded categories:
+  - Length: Blue
+  - Mass: Green
+  - Volume: Purple
+  - Area: Orange
+  - Temperature: Red
+  - Time: Indigo
+  - Digital: Cyan
+  - Energy: Yellow
+  - Others: Gray
+
+### 4. Power User Features
+- **Keyboard Shortcuts:**
+  - `Tab` - Cycle through units
+  - `/` - Focus search
+  - `Esc` - Clear inputs
+  - `Ctrl/Cmd + K` - Command palette
+  - `Ctrl/Cmd + C` - Copy result
+- Quick access to favorite/recent conversions
+- One-click copy results
+- Conversion history with undo/redo
+- URL-based sharing of conversions
+
+### 5. Mobile-First Design
+- Large touch targets (min 44px)
+- Swipe gestures to switch between categories
+- Optimized for one-handed use
+- Bottom sheet UI for unit selection on mobile
+- Haptic feedback on interactions
+
+## Technical Architecture
+
+### Pages Structure
+```
+app/
+├── page.tsx              # Home - Main conversion interface
+├── layout.tsx            # Root layout with metadata
+├── categories/
+│   └── page.tsx          # Browse all unit categories
+├── [category]/
+│   └── page.tsx          # Category-specific converter
+└── about/
+    └── page.tsx          # About the app
+```
+
+### Component Structure
+```
+components/
+├── converter/
+│   ├── MainConverter.tsx       # Main conversion interface
+│   ├── UnitInput.tsx          # Individual unit input field
+│   ├── UnitSelector.tsx       # Unit selection dropdown
+│   ├── CategoryTabs.tsx       # Category navigation
+│   └── VisualComparison.tsx   # Visual magnitude display
+├── search/
+│   ├── FuzzySearch.tsx        # Fuzzy search component
+│   └── CommandPalette.tsx     # Keyboard command interface
+├── history/
+│   ├── ConversionHistory.tsx  # History sidebar
+│   └── HistoryItem.tsx        # Individual history entry
+└── ui/
+    ├── Button.tsx
+    ├── Input.tsx
+    ├── Card.tsx
+    └── Badge.tsx
+```
+
+### State Management
+```typescript
+// Global state structure
+interface AppState {
+  currentCategory: string | null;
+  selectedUnits: {
+    from: string;
+    to: string[];
+  };
+  inputValue: number | null;
+  history: ConversionRecord[];
+  favorites: string[];
+  preferences: UserPreferences;
+}
+```
+
+### Data Layer
+```typescript
+// Unit metadata
+interface UnitInfo {
+  abbr: string;
+  measure: string;
+  system: 'metric' | 'imperial' | 'other';
+  plural: string;
+  singular: string;
+  description?: string;
+}
+
+// Conversion record
+interface ConversionRecord {
+  id: string;
+  timestamp: number;
+  from: { value: number; unit: string };
+  to: { value: number; unit: string };
+  category: string;
+}
+```
+
+## Implementation Phases
+
+### Phase 1: Project Setup
+- [x] Initialize git repository
+- [ ] Initialize Next.js 16 project with TypeScript
+- [ ] Configure Tailwind CSS 4
+- [ ] Install convert-units library
+- [ ] Set up project structure
+- [ ] Configure static export
+
+### Phase 2: Core Conversion Engine
+- [ ] Create convert-units wrapper/service
+- [ ] Implement real-time conversion logic
+- [ ] Build unit metadata system
+- [ ] Add input validation and error handling
+- [ ] Create conversion utilities
+
+### Phase 3: Main UI Components
+- [ ] Build MainConverter component
+- [ ] Create UnitInput with live updates
+- [ ] Implement UnitSelector dropdown
+- [ ] Add CategoryTabs navigation
+- [ ] Design responsive layout with Tailwind CSS 4
+
+### Phase 4: Enhanced UX Features
+- [ ] Implement fuzzy search for units
+- [ ] Add visual comparison bars
+- [ ] Create command palette
+- [ ] Build keyboard shortcuts system
+- [ ] Add smooth animations
+
+### Phase 5: User Preferences & History
+- [ ] Implement localStorage for history
+- [ ] Add favorites system
+- [ ] Create conversion history UI
+- [ ] Add undo/redo functionality
+- [ ] Build user preferences panel
+
+### Phase 6: Mobile Optimization
+- [ ] Optimize touch targets
+- [ ] Implement swipe gestures
+- [ ] Create bottom sheet UI
+- [ ] Add haptic feedback
+- [ ] Test on various devices
+
+### Phase 7: Accessibility & Polish
+- [ ] WCAG 2.1 AA compliance
+- [ ] Screen reader optimization
+- [ ] Keyboard navigation testing
+- [ ] Add dark mode support
+- [ ] Performance optimization
+
+### Phase 8: Static Generation & Deployment
+- [ ] Configure Next.js static export
+- [ ] Optimize bundle size
+- [ ] Add SEO metadata
+- [ ] Generate sitemap
+- [ ] Deploy to hosting platform
+
+## Design System
+
+### Color Palette (Category-based)
+```css
+/* Length */
+--color-length: #3B82F6;      /* Blue */
+
+/* Mass */
+--color-mass: #10B981;        /* Green */
+
+/* Volume */
+--color-volume: #8B5CF6;      /* Purple */
+
+/* Area */
+--color-area: #F59E0B;        /* Orange */
+
+/* Temperature */
+--color-temperature: #EF4444; /* Red */
+
+/* Time */
+--color-time: #6366F1;        /* Indigo */
+
+/* Digital */
+--color-digital: #06B6D4;     /* Cyan */
+
+/* Energy */
+--color-energy: #EAB308;      /* Yellow */
+```
+
+### Typography
+- **Headings:** Inter (system font fallback)
+- **Body:** System UI stack
+- **Mono:** JetBrains Mono (for numbers)
+
+### Spacing Scale
+- Tailwind CSS 4 default scale
+- Custom breakpoints for mobile-first design
+
+## Supported Unit Categories
+
+Based on convert-units library:
+
+1. **Length**: mm, cm, m, km, in, ft, yd, mi
+2. **Mass**: mcg, mg, g, kg, oz, lb, mt, t
+3. **Volume**: ml, l, tsp, Tbs, fl-oz, cup, pnt, qt, gal
+4. **Area**: mm2, cm2, m2, ha, km2, in2, ft2, ac, mi2
+5. **Temperature**: C, F, K, R
+6. **Time**: ns, mu, ms, s, min, h, d, week, month, year
+7. **Digital**: b, Kb, Mb, Gb, Tb, B, KB, MB, GB, TB
+8. **Energy**: J, kJ, Wh, kWh, eV, cal, kcal
+9. **Frequency**: Hz, kHz, MHz, GHz
+10. **Speed**: m/s, km/h, mph, knot, ft/s
+11. **Pressure**: Pa, hPa, kPa, MPa, bar, torr, psi
+12. **Angle**: deg, rad, grad, arcmin, arcsec
+13. **Others**: ea (each), dz (dozen)
+
+## Performance Targets
+
+- **First Contentful Paint**: < 1.0s
+- **Time to Interactive**: < 2.0s
+- **Lighthouse Score**: > 95
+- **Bundle Size**: < 100KB (gzipped)
+
+## Accessibility Requirements
+
+- WCAG 2.1 AA compliance
+- Keyboard navigation for all features
+- Screen reader support with ARIA labels
+- Focus indicators
+- Color contrast ratios ≥ 4.5:1
+- Reduced motion support
+
+## Browser Support
+
+- Chrome/Edge (last 2 versions)
+- Firefox (last 2 versions)
+- Safari (last 2 versions)
+- Mobile Safari iOS 14+
+- Chrome Android (last 2 versions)
+
+## Future Enhancements
+
+- Custom unit creation
+- Multi-unit conversions (e.g., feet + inches)
+- Currency conversion
+- Unit conversion formulas display
+- Share conversions as images
+- PWA support with offline capability
+- Multi-language support
+- Voice input for conversions
+- API for programmatic access
+
+## Development Guidelines
+
+1. **Code Style**: Follow Airbnb TypeScript style guide
+2. **Commits**: Conventional commits format
+3. **Testing**: Unit tests for conversion logic
+4. **Documentation**: JSDoc for all components
+5. **Performance**: Monitor bundle size and runtime performance
+
+---
+
+**Project Start Date:** 2025-11-08
+**Target Completion:** TBD
+**Version:** 1.0.0