docs: add comprehensive implementation plan for feature completeness

Create detailed roadmap to MVP and beyond: **Plan Overview:** - 15 phases covering all features from CLAUDE.md - Estimated 40-55 hours total development time - 4-6 week timeline with 4 sprints - Clear priority ordering (High/Medium/Low) **Phases Defined:** 1. ✅ Foundation - COMPLETE (Next.js 16, TypeScript, API client) 2. ✅ Core Color Components - COMPLETE (Picker, Display, Info, Playground) 3. 🚧 Color Manipulation Tools - IN PROGRESS (sliders, operations, history) 4. Palette Generation - 4 sub-pages (harmony, distinct, gradient, dashboard) 5. Accessibility Tools - Contrast checker, colorblind simulator 6. Named Colors Explorer - Searchable grid of 148 colors 7. Batch Operations - CSV/JSON upload and processing 8. Navigation & Layout - Navbar, theme toggle, command palette 9. Enhanced UI Components - 10+ additional components 10. State Management - Zustand stores + localStorage 11. Utility Functions - Color, export, keyboard helpers 12. Documentation - Docs page and in-app help 13. Testing - Unit tests (Vitest) + E2E (Playwright) 14. Performance Optimization - Code splitting, caching 15. CI/CD & Deployment - GitHub Actions, Vercel **Sprint 1 Priority (Week 1):** - Color manipulation tools (lighten, darken, saturate, etc.) - Navigation with theme toggle - Essential UI components (Slider, Tabs, Dialog) **Success Criteria for MVP:** - All color manipulation tools working - 2+ palette generation methods - Contrast checker functional - Named colors searchable - Export to CSS/JSON - Mobile responsive - Deployed to production **Timeline:** - Week 1: Core manipulation + navigation (12-15h) - Week 2: Palettes + state management (10-13h) - Week 3: Accessibility + extras (12-15h) - Week 4: Testing + deployment (6-12h) Ready to proceed with Sprint 1 implementation! 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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+# Pastel UI - Implementation Plan
+
+**Status**: In Progress
+**Started**: 2025-11-07
+**Target**: Feature Complete MVP
+
+## Overview
+
+This document outlines the complete implementation plan to achieve feature completeness for Pastel UI, a modern web application for color manipulation, palette generation, and accessibility analysis.
+
+## ✅ Completed Features
+
+### Phase 1: Foundation (DONE)
+- [x] Next.js 16 setup with TypeScript
+- [x] Tailwind CSS 4 configuration
+- [x] Project structure and directories
+- [x] Type-safe Pastel API client (all 21 endpoints)
+- [x] Base UI components (Button, Input)
+- [x] React Query integration
+- [x] Providers setup (QueryClient, Toaster)
+
+### Phase 2: Core Color Components (DONE)
+- [x] ColorPicker component with react-colorful
+- [x] ColorDisplay component for previews
+- [x] ColorInfo component with format display
+- [x] React Query hooks for all API endpoints
+- [x] Playground page with live color picking
+- [x] Copy to clipboard functionality
+- [x] Loading and error states
+
+## 🚧 Remaining Features
+
+### Phase 3: Color Manipulation Tools
+**Priority**: High
+**Estimated Time**: 4-6 hours
+
+#### 3.1 Manipulation Panel Component
+- [ ] Create `ManipulationPanel.tsx` with sliders
+- [ ] Lighten/Darken controls (0-100% range)
+- [ ] Saturate/Desaturate controls (0-100% range)
+- [ ] Hue rotation control (0-360° range)
+- [ ] Real-time preview while adjusting
+- [ ] Apply/Reset buttons
+- [ ] Debounced API calls for smooth UX
+
+#### 3.2 Color Operations
+- [ ] Complement color generator
+- [ ] Grayscale conversion
+- [ ] Color mixing interface
+  - [ ] Two color inputs
+  - [ ] Ratio slider (0-100%)
+  - [ ] Color space selection dropdown
+- [ ] Color history tracking (Zustand store)
+- [ ] Undo/Redo functionality
+
+#### 3.3 Enhanced Playground
+- [ ] Connect Quick Action buttons to mutations
+- [ ] Add color history sidebar
+- [ ] Keyboard shortcuts (Cmd+C copy, Cmd+Z undo)
+- [ ] Save favorite colors to localStorage
+- [ ] Export color as image/SVG
+
+### Phase 4: Palette Generation
+**Priority**: High
+**Estimated Time**: 6-8 hours
+
+#### 4.1 Palette Components
+- [ ] `PaletteGrid.tsx` - Display palette as grid/list
+- [ ] `PaletteSwatch.tsx` - Individual color in palette
+- [ ] `PaletteExport.tsx` - Export menu component
+- [ ] `ColorStopEditor.tsx` - Gradient stop editor
+
+#### 4.2 Harmony Palettes Page (`/palettes/harmony`)
+- [ ] Base color picker
+- [ ] Harmony type selector:
+  - [ ] Monochromatic
+  - [ ] Analogous
+  - [ ] Complementary
+  - [ ] Split-complementary
+  - [ ] Triadic
+  - [ ] Tetradic
+- [ ] Live preview of generated palette
+- [ ] Adjust harmony angles (advanced mode)
+- [ ] Export palette
+
+#### 4.3 Distinct Colors Page (`/palettes/distinct`)
+- [ ] Count selector (2-100 colors)
+- [ ] Distance metric selection (CIE76, CIEDE2000)
+- [ ] Optional fixed colors input
+- [ ] Progress indicator with estimated time
+- [ ] Cancel button for long operations
+- [ ] Statistics display (min/avg distance, generation time)
+- [ ] Regenerate button
+
+#### 4.4 Gradient Creator Page (`/palettes/gradient`)
+- [ ] Multiple color stops editor (add/remove/reorder)
+- [ ] Stop count selector (2-1000 steps)
+- [ ] Color space dropdown (RGB, HSL, Lab, LCH, OkLab, OkLCH)
+- [ ] Live gradient preview (horizontal/vertical/radial)
+- [ ] Export as CSS gradient code
+- [ ] Export as color array
+- [ ] Copy individual colors from gradient
+
+#### 4.5 Palette Dashboard Page (`/palettes`)
+- [ ] Overview of all palette types
+- [ ] Quick links to each generator
+- [ ] Recent palettes gallery (localStorage)
+- [ ] Saved palettes management
+- [ ] Share palette via URL
+
+#### 4.6 Export Functionality
+- [ ] Export formats:
+  - [ ] CSS variables (`:root { --color-1: #...}`)
+  - [ ] SCSS variables (`$color-1: #...`)
+  - [ ] Tailwind config (`colors: { primary: '#...' }`)
+  - [ ] JSON (`{"colors": [...]}`)
+  - [ ] SVG swatches (visual export)
+  - [ ] PNG image (rendered swatches)
+- [ ] Copy to clipboard
+- [ ] Download as file
+- [ ] Variable naming options
+
+### Phase 5: Accessibility Tools
+**Priority**: High
+**Estimated Time**: 5-7 hours
+
+#### 5.1 Accessibility Components
+- [ ] `ContrastChecker.tsx` - WCAG contrast analysis
+- [ ] `ColorBlindSimulator.tsx` - Simulation previews
+- [ ] `WCAGBadge.tsx` - AA/AAA compliance indicators
+- [ ] `AccessibilityReport.tsx` - Full report component
+
+#### 5.2 Contrast Checker Page (`/accessibility/contrast`)
+- [ ] Foreground color picker
+- [ ] Background color picker
+- [ ] Live contrast ratio calculation
+- [ ] WCAG 2.1 compliance display:
+  - [ ] Normal text (AA: 4.5:1, AAA: 7:1)
+  - [ ] Large text (AA: 3:1, AAA: 4.5:1)
+  - [ ] UI components (AA: 3:1)
+- [ ] Pass/Fail badges with explanations
+- [ ] Text preview with actual contrast
+- [ ] Suggestions for improvement
+- [ ] Swap colors button
+- [ ] Share contrast check via URL
+
+#### 5.3 Color Blindness Simulator Page (`/accessibility/colorblind`)
+- [ ] Color input (single or batch)
+- [ ] Simulation type selector:
+  - [ ] Protanopia (red-blind)
+  - [ ] Deuteranopia (green-blind)
+  - [ ] Tritanopia (blue-blind)
+- [ ] Side-by-side comparison view
+- [ ] Batch simulation for palettes
+- [ ] Download simulated palette
+- [ ] Educational information about each type
+
+#### 5.4 Accessibility Dashboard Page (`/accessibility`)
+- [ ] Overview of tools
+- [ ] Quick contrast check widget
+- [ ] Recent accessibility checks
+- [ ] Educational resources links
+
+#### 5.5 Text Color Optimizer
+- [ ] Background color input
+- [ ] Automatic best text color calculation
+- [ ] WCAG compliance guarantee
+- [ ] Light vs Dark comparison
+- [ ] Integrate into Contrast Checker page
+
+### Phase 6: Named Colors Explorer
+**Priority**: Medium
+**Estimated Time**: 3-4 hours
+
+#### 6.1 Components
+- [ ] `NamedColorsGrid.tsx` - Grid of all colors
+- [ ] `ColorCard.tsx` - Individual color card
+- [ ] `ColorSearch.tsx` - Search and filter UI
+
+#### 6.2 Named Colors Page (`/names`)
+- [ ] Display all 148 CSS/X11 named colors
+- [ ] Grid view with color swatches and names
+- [ ] Search by name or hex value
+- [ ] Filter by:
+  - [ ] Hue range (red, blue, green, etc.)
+  - [ ] Brightness (light, medium, dark)
+  - [ ] Saturation (vivid, muted, gray)
+- [ ] Sort options:
+  - [ ] Alphabetical
+  - [ ] By hue
+  - [ ] By brightness
+  - [ ] By saturation
+- [ ] Click color to use in playground
+- [ ] Find nearest named color for custom input
+- [ ] Copy color on click
+- [ ] Favorites/bookmarks
+
+### Phase 7: Batch Operations
+**Priority**: Medium
+**Estimated Time**: 4-5 hours
+
+#### 7.1 Components
+- [ ] `BatchUploader.tsx` - File upload interface
+- [ ] `BatchOperationSelector.tsx` - Operation picker
+- [ ] `BatchPreview.tsx` - Results preview table
+- [ ] `BatchExporter.tsx` - Download results
+
+#### 7.2 Batch Page (`/batch`)
+- [ ] File upload (CSV, JSON)
+  - [ ] CSV format: `color\n#ff0099\nrgb(255,0,153)`
+  - [ ] JSON format: `{"colors": ["#ff0099", "rgb(255,0,153)"]}`
+- [ ] Manual color list input
+- [ ] Operation selection:
+  - [ ] Format conversion
+  - [ ] Lighten/Darken
+  - [ ] Saturate/Desaturate
+  - [ ] Rotate hue
+  - [ ] Complement
+  - [ ] Grayscale
+  - [ ] Color blindness simulation
+- [ ] Progress bar for processing
+- [ ] Results preview table
+- [ ] Export results in multiple formats
+- [ ] Error handling for invalid colors
+
+### Phase 8: Navigation & Layout
+**Priority**: High
+**Estimated Time**: 3-4 hours
+
+#### 8.1 Layout Components
+- [ ] `Navbar.tsx` - Top navigation
+  - [ ] Logo
+  - [ ] Main navigation links
+  - [ ] Theme toggle (dark/light mode)
+  - [ ] Command palette trigger (Cmd+K)
+- [ ] `Sidebar.tsx` - Side navigation (optional)
+- [ ] `Footer.tsx` - Footer with links
+- [ ] `MobileMenu.tsx` - Responsive mobile menu
+
+#### 8.2 Theme System
+- [ ] Theme provider with context
+- [ ] Theme toggle component
+- [ ] System preference detection
+- [ ] Persist theme to localStorage
+- [ ] Smooth theme transitions
+
+#### 8.3 Command Palette
+- [ ] Install cmdk (already installed)
+- [ ] `CommandPalette.tsx` component
+- [ ] Keyboard shortcut (Cmd+K)
+- [ ] Search all features
+- [ ] Quick navigation
+- [ ] Recent colors/palettes
+- [ ] Keyboard shortcuts reference
+
+### Phase 9: Enhanced UI Components
+**Priority**: Medium
+**Estimated Time**: 4-5 hours
+
+#### 9.1 Additional UI Components
+- [ ] `Slider.tsx` - For manipulation controls
+- [ ] `Tabs.tsx` - For format switching
+- [ ] `Dialog.tsx` - For modals
+- [ ] `DropdownMenu.tsx` - For menus
+- [ ] `Select.tsx` - For selections
+- [ ] `Label.tsx` - Form labels
+- [ ] `Card.tsx` - Container component
+- [ ] `Badge.tsx` - For status indicators
+- [ ] `Tooltip.tsx` - For helpful hints
+- [ ] `Separator.tsx` - Visual divider
+
+#### 9.2 Color-Specific UI
+- [ ] `ColorSwatch.tsx` - Small color preview
+- [ ] `ColorInput.tsx` - Validated color input
+- [ ] `ColorHistory.tsx` - History timeline
+- [ ] `ColorFavorites.tsx` - Saved colors
+
+### Phase 10: State Management & Persistence
+**Priority**: Medium
+**Estimated Time**: 3-4 hours
+
+#### 10.1 Zustand Stores
+- [ ] `colorStore.ts` - Current color state
+- [ ] `historyStore.ts` - Color history with undo/redo
+- [ ] `preferencesStore.ts` - User preferences
+  - [ ] Theme preference
+  - [ ] Preferred color formats
+  - [ ] Default export format
+- [ ] `palettesStore.ts` - Saved palettes
+
+#### 10.2 LocalStorage Integration
+- [ ] Persist color history (last 50 colors)
+- [ ] Persist saved palettes
+- [ ] Persist user preferences
+- [ ] Clear data functionality
+
+#### 10.3 URL State
+- [ ] Share colors via URL (`?color=ff0099`)
+- [ ] Share palettes via URL (`?palette=ff0099,00ccff,ffcc00`)
+- [ ] Share contrast checks via URL
+
+### Phase 11: Utility Functions
+**Priority**: Medium
+**Estimated Time**: 2-3 hours
+
+#### 11.1 Color Utilities (`lib/utils/color.ts`)
+- [ ] `parseColor(input: string)` - Parse any format
+- [ ] `validateColor(input: string)` - Validate color
+- [ ] `formatColor(color, format)` - Format conversion
+- [ ] `getContrastRatio(fg, bg)` - WCAG contrast
+- [ ] `isLightColor(color)` - Light/dark detection
+
+#### 11.2 Export Utilities (`lib/utils/export.ts`)
+- [ ] `exportAsCSS(colors)` - CSS variables
+- [ ] `exportAsSCSS(colors)` - SCSS variables
+- [ ] `exportAsTailwind(colors)` - Tailwind config
+- [ ] `exportAsJSON(colors)` - JSON format
+- [ ] `exportAsSVG(colors)` - SVG swatches
+- [ ] `exportAsPNG(colors)` - PNG image
+
+#### 11.3 Keyboard Shortcuts (`lib/hooks/useKeyboard.ts`)
+- [ ] Cmd+K - Command palette
+- [ ] Cmd+C - Copy current color
+- [ ] Cmd+V - Paste color
+- [ ] Cmd+Z - Undo
+- [ ] Cmd+Shift+Z - Redo
+- [ ] Cmd+D - Toggle dark mode
+- [ ] Cmd+/ - Show shortcuts help
+
+### Phase 12: Documentation & Help
+**Priority**: Low
+**Estimated Time**: 2-3 hours
+
+#### 12.1 Docs Page (`/docs`)
+- [ ] Getting started guide
+- [ ] Feature overview
+- [ ] API integration guide
+- [ ] Keyboard shortcuts reference
+- [ ] Export format examples
+- [ ] Color theory basics
+- [ ] WCAG guidelines explanation
+
+#### 12.2 In-App Help
+- [ ] Tooltips on hover
+- [ ] Help icons with popovers
+- [ ] Onboarding tour (optional)
+- [ ] Feature flags for tours
+
+### Phase 13: Testing
+**Priority**: Medium
+**Estimated Time**: 4-6 hours
+
+#### 13.1 Unit Tests (Vitest)
+- [ ] Test color utilities
+- [ ] Test export utilities
+- [ ] Test component rendering
+- [ ] Test API client
+- [ ] Test stores (Zustand)
+
+#### 13.2 E2E Tests (Playwright)
+- [ ] Test playground flow
+- [ ] Test palette generation
+- [ ] Test accessibility tools
+- [ ] Test batch operations
+- [ ] Test named colors search
+
+#### 13.3 Accessibility Testing
+- [ ] Keyboard navigation test
+- [ ] Screen reader compatibility
+- [ ] Color contrast verification
+- [ ] ARIA labels audit
+
+### Phase 14: Performance Optimization
+**Priority**: Low
+**Estimated Time**: 2-3 hours
+
+#### 14.1 Code Splitting
+- [ ] Dynamic imports for heavy components
+- [ ] Route-based code splitting (already done)
+- [ ] Lazy load color picker libraries
+
+#### 14.2 Caching Strategy
+- [ ] API response caching (React Query)
+- [ ] Image caching
+- [ ] Static asset optimization
+
+#### 14.3 Bundle Optimization
+- [ ] Analyze bundle size
+- [ ] Tree-shake unused code
+- [ ] Optimize images
+- [ ] Target < 200KB initial bundle
+
+### Phase 15: CI/CD & Deployment
+**Priority**: High
+**Estimated Time**: 2-3 hours
+
+#### 15.1 GitHub Actions
+- [ ] `.github/workflows/ci.yml`
+  - [ ] Lint job (ESLint)
+  - [ ] Type check job (TypeScript)
+  - [ ] Test job (Vitest)
+  - [ ] Build job (Next.js)
+  - [ ] E2E test job (Playwright)
+
+#### 15.2 Vercel Deployment
+- [ ] Connect to Vercel
+- [ ] Configure environment variables
+- [ ] Set up preview deployments
+- [ ] Configure production domain
+- [ ] Set up analytics (optional)
+
+#### 15.3 Environment Configuration
+- [ ] `.env.example` updates
+- [ ] Production API URL configuration
+- [ ] Error tracking setup (Sentry - optional)
+
+## Implementation Priority Order
+
+### Sprint 1: Core Functionality (Week 1)
+1. Phase 3: Color Manipulation Tools ⭐⭐⭐
+2. Phase 8: Navigation & Layout ⭐⭐⭐
+3. Phase 9.1: Essential UI Components ⭐⭐
+
+### Sprint 2: Palette Features (Week 2)
+4. Phase 4: Palette Generation ⭐⭐⭐
+5. Phase 10: State Management ⭐⭐
+
+### Sprint 3: Accessibility & Extras (Week 3)
+6. Phase 5: Accessibility Tools ⭐⭐⭐
+7. Phase 6: Named Colors Explorer ⭐⭐
+8. Phase 7: Batch Operations ⭐⭐
+
+### Sprint 4: Polish & Launch (Week 4)
+9. Phase 11: Utility Functions ⭐⭐
+10. Phase 13: Testing ⭐⭐
+11. Phase 15: CI/CD & Deployment ⭐⭐⭐
+12. Phase 12: Documentation ⭐
+13. Phase 14: Performance Optimization ⭐
+
+## Success Criteria
+
+### MVP Requirements (Before Launch)
+- [x] Color picker working with live preview
+- [ ] All color manipulation tools functional
+- [ ] At least 2 palette generation methods
+- [ ] Contrast checker working
+- [ ] Named colors searchable
+- [ ] Export to CSS/JSON working
+- [ ] Mobile responsive
+- [ ] Basic keyboard shortcuts
+- [ ] Error handling throughout
+- [ ] Deployed to production
+
+### Nice-to-Have Features
+- [ ] Color history with undo/redo
+- [ ] Saved palettes
+- [ ] Batch operations
+- [ ] Command palette
+- [ ] Comprehensive docs
+- [ ] E2E tests
+- [ ] Performance < 200KB
+
+## Technical Debt & Known Issues
+
+### Current Issues
+- [ ] Warning about multiple lockfiles (not critical)
+- [ ] React Compiler not enabled (requires babel plugin)
+- [ ] TypeScript ESLint rules simplified (can be re-enabled)
+
+### Future Improvements
+- [ ] Add Storybook for component documentation
+- [ ] Set up visual regression testing
+- [ ] Add internationalization (i18n)
+- [ ] Progressive Web App (PWA) features
+- [ ] Offline support with Service Worker
+- [ ] Color palette AI suggestions (ML integration)
+
+## Timeline Estimate
+
+**Total Estimated Time**: 40-55 hours
+**Target Completion**: 4-6 weeks (part-time development)
+
+### Weekly Breakdown
+- **Week 1**: Core manipulation + navigation (12-15h)
+- **Week 2**: Palettes + state management (10-13h)
+- **Week 3**: Accessibility + extras (12-15h)
+- **Week 4**: Testing + deployment + docs (6-12h)
+
+## Notes
+
+- All components should follow established patterns
+- Maintain type safety throughout
+- Follow accessibility best practices
+- Keep bundle size under 200KB initial load
+- Test on mobile devices regularly
+- Document complex logic with comments
+- Use React Query for all API calls
+- Implement proper error boundaries
+- Add loading states for all async operations
+
+---
+
+**Last Updated**: 2025-11-07
+**Next Review**: After Sprint 1 completion