# Architecture

This section covers the technical architecture, design decisions, and implementation details of the Leptos ShadCN UI library.

## 🏗️ Architecture Overview

The Leptos ShadCN UI library is built on several key architectural principles:

- **Component-Based**: Modular, reusable UI components
- **Type-Safe**: Full Rust type safety with compile-time checks
- **Reactive**: Built on Leptos signals for reactive updates
- **Accessible**: WCAG 2.1 compliant components
- **Customizable**: Flexible theming and styling system

## 📁 Structure

### [Design Decisions](./design-decisions/)
Architecture Decision Records (ADRs) documenting key technical choices:
- TDD-first approach
- Testing pyramid strategy
- API contracts and testing
- Package management strategy
- Leptos versioning strategy
- Rust coding standards

### [Migration Guides](./migration-guides/)
Guides for upgrading between versions:
- Leptos 0.8.8 migration
- Signal integration updates
- Breaking changes documentation

### [Coverage Analysis](./coverage/)
Test coverage documentation and analysis:
- Coverage remediation plans
- Tool recommendations
- Achievement summaries
- Zero coverage priority plans

### [Performance](./performance/)
Performance analysis and optimization:
- Benchmarks and metrics
- Performance audit results
- Optimization strategies
- Load testing results

## 🔧 Technical Details

### Core Technologies
- **Leptos**: Reactive web framework
- **Tailwind CSS**: Utility-first styling
- **WebAssembly**: Client-side execution
- **Rust**: Type-safe systems programming

### Component Architecture
- **Props**: Type-safe component properties
- **Signals**: Reactive state management
- **Events**: Event handling and callbacks
- **Styling**: CSS-in-Rust approach

## 📊 Quality Metrics

- **Test Coverage**: 90%+ across all components
- **Performance**: Sub-100ms component rendering
- **Accessibility**: WCAG 2.1 AA compliance
- **Bundle Size**: Optimized for production

## 🔄 Development Workflow

1. **Design**: Create ADRs for major decisions
2. **Implement**: Follow TDD approach
3. **Test**: Comprehensive test coverage
4. **Review**: Code and architecture review
5. **Document**: Update documentation

## 📈 Future Architecture

See our [Roadmap](../roadmap/README.md) for planned architectural improvements and new features.