Reorganize repository structure and add documentation

.gitignore

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 # JetBrains IDEs
 .idea/
 *.iml
+
+# VSCode
 .vscode/
 *.code-workspace
 

ARCHITECTURE.md

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+# Project Architecture
+
+This document provides an overview of the HPCSS ICT Revision Hub architecture and project organization.
+
+## Overview
+
+The HPCSS ICT Revision Hub is a modern, interactive learning platform built with Next.js 15, TypeScript, and Tailwind CSS. The application provides an immersive experience for students preparing for HKDSE ICT examinations.
+
+## Technology Stack
+
+### Core Framework
+- **Next.js 15** - React framework with App Router
+- **React 19** - UI library
+- **TypeScript** - Type-safe development
+- **Tailwind CSS 4** - Utility-first CSS framework
+
+### Key Libraries
+- **Framer Motion** - Animation library
+- **Lucide React** - Icon library
+- **Headless UI** - Accessible component primitives
+- **GSAP & Anime.js** - Advanced animations
+- **Three.js** - 3D graphics
+- **Google Gemini API** - AI-powered chat features
+
+### Mobile Development
+- **Capacitor** - Native mobile app wrapper for Android/iOS
+
+### Development Tools
+- **ESLint** - Code linting
+- **Size Limit** - Bundle size monitoring
+- **Lighthouse** - Performance auditing
+
+## Project Structure
+
+```
+sunset/
+├── src/                    # Main application source
+│   ├── app/               # Next.js App Router pages & routes
+│   ├── components/        # Reusable React components
+│   ├── contexts/          # React Context providers (theme, auth)
+│   ├── data/              # Static data and configuration
+│   ├── hooks/             # Custom React hooks
+│   ├── lib/               # Utility functions
+│   ├── services/          # API services and integrations
+│   └── types/             # TypeScript type definitions
+│
+├── docs/                   # Project documentation
+│   ├── design/            # Design specifications
+│   ├── implementation/    # Technical guides
+│   ├── planning/          # Project planning
+│   └── supabase-schema.sql # Database schema
+│
+├── scripts/               # Utility scripts
+│   ├── DELIVERY_CHECKLIST.js # Project status tracker
+│   └── update-apk.ps1     # Android APK automation
+│
+├── public/                # Static assets (images, icons, PWA)
+├── types/                 # Global TypeScript declarations
+├── new-design/            # Experimental Vite prototype
+└── archive/               # Archived legacy files
+```
+
+## Application Architecture
+
+### Routing Structure
+The application uses Next.js App Router with the following main routes:
+- `/` - Homepage with hero section and course cards
+- `/courses` - All courses listing
+- `/javascript` - JavaScript course content
+- `/python` - Python algorithms course
+- `/about` - About page
+- `/new-design` - Experimental immersive UI prototype
+
+### Component Hierarchy
+```
+App (layout.tsx)
+├── ThemeProvider (contexts/ThemeContext)
+├── AuthProvider (contexts/AuthContext)
+└── Page Content
+    ├── Header (navigation)
+    ├── HeroSection (landing)
+    ├── ResourceCards (course listings)
+    └── Footer
+```
+
+### State Management
+- **Theme Context**: Manages dark/light theme preferences
+- **Auth Context**: Handles user authentication state
+- React's built-in state management (useState, useReducer)
+- No external state management library required
+
+### Data Flow
+1. Static data stored in `src/data/` (courses, resources)
+2. API calls handled through `src/services/`
+3. Context providers manage global state
+4. Components consume data via props and hooks
+
+## Key Features
+
+### 1. Responsive Design
+- Mobile-first approach
+- Breakpoints: sm (640px), md (768px), lg (1024px), xl (1280px)
+- Adaptive layouts using Tailwind's responsive utilities
+
+### 2. Theme System
+- System preference detection
+- Manual theme toggle
+- CSS variables for consistent theming
+- Smooth theme transitions
+
+### 3. Authentication
+- JWT-based authentication
+- Supabase integration
+- Protected routes
+- Session management
+
+### 4. 3D Animations
+- Three.js scenes for immersive backgrounds
+- Scroll-triggered animations with Anime.js
+- GSAP for complex timeline animations
+- Performance-optimized rendering
+
+### 5. AI Integration (Experimental)
+- Google Gemini API for intelligent tutoring
+- Available in `/new-design` route
+- Requires `GEMINI_API_KEY` environment variable
+
+## Build & Deployment
+
+### Development
+```bash
+npm run dev              # Start dev server with Turbopack
+npm run type-check       # TypeScript validation
+npm run lint             # Code linting
+```
+
+### Production Build
+```bash
+npm run build            # Production build
+npm run start            # Start production server
+npm run build:production # Build with NODE_ENV=production
+```
+
+### Performance Monitoring
+```bash
+npm run size             # Check bundle sizes
+npm run lighthouse       # Run Lighthouse audit
+npm run perf:analyze     # Bundle analysis
+```
+
+### Mobile Development
+```bash
+npm run android:sync     # Sync to Android project
+npm run android:open     # Open in Android Studio
+npm run android:apk      # Build APK
+npm run android:update   # Automated APK update
+```
+
+## Database Schema
+
+The application uses Supabase for backend services. Database schema is documented in `docs/supabase-schema.sql`.
+
+Key tables:
+- Users and authentication
+- Course progress tracking
+- User preferences
+- Content management
+
+## Environment Variables
+
+Create `.env.local` in the project root:
+
+```env
+# Required for AI features
+GEMINI_API_KEY=your-api-key
+
+# Supabase (if using backend)
+NEXT_PUBLIC_SUPABASE_URL=your-supabase-url
+NEXT_PUBLIC_SUPABASE_ANON_KEY=your-anon-key
+```
+
+## Development Guidelines
+
+### Code Style
+- TypeScript for type safety
+- Functional components with hooks
+- Tailwind CSS for styling (avoid inline styles)
+- Follow existing component patterns
+
+### File Naming
+- Components: PascalCase (e.g., `HeroSection.tsx`)
+- Utilities: camelCase (e.g., `utils.ts`)
+- Constants: UPPERCASE (e.g., `RESOURCES.ts`)
+
+### Component Structure
+```typescript
+// 1. Imports
+import { useState } from 'react';
+import { ComponentProps } from './types';
+
+// 2. Types/Interfaces
+interface Props {
+  title: string;
+}
+
+// 3. Component
+export function Component({ title }: Props) {
+  // 4. Hooks
+  const [state, setState] = useState();
+
+  // 5. Effects
+  useEffect(() => {}, []);
+
+  // 6. Handlers
+  const handleClick = () => {};
+
+  // 7. Render
+  return <div>{title}</div>;
+}
+```
+
+### Best Practices
+1. Keep components small and focused
+2. Extract reusable logic into custom hooks
+3. Use TypeScript for all new code
+4. Write descriptive commit messages
+5. Test responsive behavior
+6. Optimize images and assets
+7. Monitor bundle size
+
+## Performance Considerations
+
+### Optimization Strategies
+- **Code Splitting**: Automatic with Next.js App Router
+- **Image Optimization**: Use Next.js `<Image>` component
+- **Lazy Loading**: Dynamic imports for heavy components
+- **CSS Purging**: Tailwind removes unused styles
+- **Bundle Analysis**: Regular size monitoring
+
+### Target Metrics
+- First Contentful Paint (FCP): < 1.8s
+- Largest Contentful Paint (LCP): < 2.5s
+- Time to Interactive (TTI): < 3.8s
+- Total Blocking Time (TBT): < 200ms
+- Cumulative Layout Shift (CLS): < 0.1
+
+## Testing
+
+Currently, the project focuses on manual testing and type checking. Future additions may include:
+- Unit tests with Jest
+- Component tests with React Testing Library
+- E2E tests with Playwright
+- Visual regression tests
+
+## Deployment
+
+The application can be deployed to:
+- **Vercel** (recommended for Next.js)
+- **Netlify**
+- **Docker containers**
+- **Static hosting** (with `next export`)
+
+Mobile apps can be distributed via:
+- Google Play Store (Android)
+- Apple App Store (iOS)
+- Direct APK download
+
+## Contributing
+
+1. Follow the established code style
+2. Keep changes minimal and focused
+3. Update documentation for significant changes
+4. Test responsive behavior on multiple devices
+5. Check performance impact of changes
+
+## Resources
+
+- [Next.js Documentation](https://nextjs.org/docs)
+- [React Documentation](https://react.dev)
+- [Tailwind CSS Documentation](https://tailwindcss.com/docs)
+- [TypeScript Handbook](https://www.typescriptlang.org/docs)
+- [Capacitor Documentation](https://capacitorjs.com/docs)
+
+## License
+
+See the main repository for license information.