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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a language learning application built with React, Waku, and Bun. It focuses on Thai language learning with features for:
+
+- Flashcard-based study using Spaced Repetition System (SRS)
+- Detailed phonetic analysis and syllable breakdown
+- Tone pattern visualization and practice
+- User progress tracking
+- Lessons and organized learning content
+
+## Commands
+
+### Development
+
+```bash
+# Start the development server
+bun run dev
+
+# Build the project
+bun run build
+
+# Start the production server
+bun run start
+```
+
+## Architecture
+
+### Framework and Runtime
+
+- **Waku**: Server-side rendering (SSR) framework
+- **React**: UI framework (v19.1)
+- **Bun**: JavaScript runtime
+- **TypeScript**: Type system
+
+### Database
+
+The project uses SQLite databases (managed in `src/lib/db/`) with schemas for:
+
+- User accounts and progress tracking
+- Language expressions and translations
+- Syllable breakdowns and phonetic information
+- Flashcards and lessons
+- Spaced repetition data
+
+### Key Components
+
+1. **Server Actions** (`src/actions/`)
+   - Server-side functions marked with `"use server";`
+   - Handle database operations and server-side logic
+   - Examples: authentication, database operations, language processing
+
+2. **Client Components** (`src/components/`)
+   - React components marked with `"use client";`
+   - Import and call server actions
+   - Manage UI state and user interactions
+
+3. **SRS System** (`src/lib/services/srs*.ts`)
+   - Implements spaced repetition algorithms
+   - Tracks user progress and schedules reviews
+   - Multiple implementations for different tracking approaches
+
+4. **Language Processing** (`src/lib/lang/`, `src/zoom/`)
+   - Thai language syllable parsing and phonetic analysis
+   - Tone pattern visualization and analysis
+   - Text parsing and hierarchical display
+
+5. **Database Handlers** (`src/lib/db/`)
+   - Connection management
+   - CRUD operations for all entities
+   - Query functions for app features
+
+### Data Flow
+
+1. Server components fetch initial data
+2. Client components render UI and handle user interactions
+3. User actions trigger server actions
+4. Server actions update the database
+5. UI updates with new data from server actions
+
+### Key Files
+
+- `waku.config.ts`: Waku framework configuration
+- `src/lib/db/schema.sql`: Main database schema
+- `src/lib/db/prosodyschema.sql`: Phonetic analysis schema
+- `src/lib/services/srs_streamlined.ts`: Main SRS implementation
+- `src/actions/`: Server actions for various features
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