---
name: moai-foundation-uiux
description: Core UI/UX Foundation - Enterprise design systems, component architecture, accessibility, icons, and theming integration
version: 2.0.0
modularized: true
last_updated: 2025-11-30
compliance_score: 80
auto_trigger_keywords:
  - foundation
  - testing
  - uiux
color: red
---

## Quick Reference (30 seconds)

# Core UI/UX Foundation

Enterprise-grade UI/UX foundation integrating design systems (W3C DTCG 2025.10), component architecture (React 19, Vue 3.5), accessibility (WCAG 2.2), icon libraries (200K+ icons), and theming systems.

**Unified Capabilities**:
- **Design Systems**: W3C DTCG 2025.10 tokens, Style Dictionary 4.0, Figma MCP workflows
- **Component Architecture**: Atomic Design, React 19, Vue 3.5, shadcn/ui, Radix UI primitives
- **Accessibility**: WCAG 2.2 AA/AAA compliance, keyboard navigation, screen reader optimization
- **Icon Libraries**: 10+ ecosystems (Lucide, React Icons 35K+, Tabler 5900+, Iconify 200K+)
- **Theming**: CSS variables, light/dark modes, theme provider, brand customization

**When to Use**:
- Building modern UI component libraries with design system foundations
- Implementing accessible, enterprise-grade user interfaces
- Setting up design token architecture for multi-platform projects
- Integrating comprehensive icon systems with optimal bundle sizes
- Creating customizable theming systems with dark mode support

**Module Organization**:
- **Components**: [Component Architecture](modules/component-architecture.md) (Atomic Design, component patterns, props APIs)
- **Design Systems**: [Design System Tokens](modules/design-system-tokens.md) (DTCG tokens, Style Dictionary, Figma MCP)
- **Accessibility**: [Accessibility WCAG](modules/accessibility-wcag.md) (WCAG 2.2 compliance, testing, navigation)
- **Icons**: [Icon Libraries](modules/icon-libraries.md) (10+ libraries, selection guide, performance optimization)
- **Theming**: [Theming System](modules/theming-system.md) (theme system, CSS variables, brand customization)
- **Examples**: [Examples](examples.md) (practical implementation examples)
- **Reference**: [Reference](reference.md) (external documentation links)

---

## Implementation Guide

### Foundation Stack (November 2025)

**Core Technologies**:
- React 19 (Server Components, Concurrent Rendering)
- TypeScript 5.5 (Full type safety, improved inference)
- Tailwind CSS 3.4 (JIT compilation, CSS variables, dark mode)
- Radix UI (Unstyled accessible primitives)
- W3C DTCG 2025.10 (Design token specification)
- Style Dictionary 4.0 (Token transformation)
- Figma MCP (Design-to-code automation)
- Storybook 8.x (Component documentation)

**Quick Decision Matrix**:
| Need | Module | Key Tools |
|------|--------|-----------|
| Design tokens | [Design System Tokens](modules/design-system-tokens.md) | DTCG 2025.10, Style Dictionary 4.0 |
| Component patterns | [Component Architecture](modules/component-architecture.md) | Atomic Design, React 19, shadcn/ui |
| Accessibility | [Accessibility WCAG](modules/accessibility-wcag.md) | WCAG 2.2, jest-axe, keyboard nav |
| Icons | [Icon Libraries](modules/icon-libraries.md) | Lucide, React Icons, Tabler, Iconify |
| Theming | [Theming System](modules/theming-system.md) | CSS variables, Theme Provider |
| Examples | [Examples](examples.md) | React/Vue implementations |

---

## Quick Start Workflows

### 1. Design System Setup (30 minutes)

**Step 1**: Initialize design tokens
```json
{
  "$schema": "https://tr.designtokens.org/format/",
  "$tokens": {
    "color": {
      "$type": "color",
      "primary": { "500": { "$value": "#3b82f6" } }
    },
    "spacing": {
      "$type": "dimension",
      "md": { "$value": "1rem" }
    }
  }
}
```

**Step 2**: Transform tokens with Style Dictionary
```bash
npm install --save-dev style-dictionary
npx style-dictionary build
```

**Step 3**: Integrate with components
```typescript
import { colors, spacing } from '@/tokens'
```

**See**: [Design System Tokens](modules/design-system-tokens.md) for complete token architecture

---

### 2. Component Library Setup (45 minutes)

**Step 1**: Initialize shadcn/ui
```bash
npx shadcn-ui@latest init
npx shadcn-ui@latest add button form dialog
```

**Step 2**: Setup Atomic Design structure
```
components/
├── atoms/      (Button, Input, Label)
├── molecules/  (FormGroup, Card)
├── organisms/  (DataTable, Modal)
```

**Step 3**: Implement with accessibility
```typescript
<Button aria-label="Submit form" variant="primary">
  Submit
</Button>
```

**See**: [Component Architecture](modules/component-architecture.md) for patterns and examples

---

### 3. Icon System Integration (15 minutes)

**Step 1**: Choose icon library
```bash
# General purpose
npm install lucide-react

# Maximum variety
npm install @iconify/react

# Dashboard optimized
npm install @tabler/icons-react
```

**Step 2**: Implement type-safe icons
```typescript
import { Heart, Search } from 'lucide-react'

<Search className="w-5 h-5 text-gray-600" />
```

**See**: [Icon Libraries](modules/icon-libraries.md) for library comparison and optimization

---

### 4. Theme System Setup (30 minutes)

**Step 1**: Configure CSS variables
```css
:root {
  --primary: 222.2 47.4% 11.2%;
  --background: 0 0% 100%;
}

.dark {
  --primary: 210 40% 98%;
  --background: 222.2 84% 4.9%;
}
```

**Step 2**: Implement Theme Provider
```typescript
<ThemeProvider attribute="class" defaultTheme="system">
  <App />
</ThemeProvider>
```

**See**: [Theming System](modules/theming-system.md) for complete theme system

---

## Key Principles

**1. Design Token First**:
- Single source of truth for design decisions
- Semantic naming (`color.primary.500` not `blue-500`)
- Multi-theme support (light/dark)
- Platform-agnostic transformation

**2. Accessibility by Default**:
- WCAG 2.2 AA minimum (4.5:1 text contrast)
- Keyboard navigation for all interactive elements
- ARIA attributes for screen readers
- Focus management and visible indicators

**3. Component Composition**:
- Atomic Design hierarchy (Atoms → Molecules → Organisms)
- Props API for reusability
- Variant-based styling (not separate components)
- Type-safe with TypeScript

**4. Performance Optimization**:
- Tree-shaking for icons (import specific, not *)
- Lazy loading for large components
- React.memo for expensive renders
- Bundle size monitoring

---

## Tool Ecosystem

| Category | Tool | Version | Purpose |
|----------|------|---------|---------|
| **Design Tokens** | W3C DTCG | 2025.10 | Token specification |
| | Style Dictionary | 4.0+ | Token transformation |
| **Components** | React | 19 | UI framework |
| | shadcn/ui | Latest | Component library |
| | Radix UI | Latest | Accessible primitives |
| **Icons** | Lucide | Latest | 1000+ modern icons |
| | React Icons | Latest | 35K+ multi-library |
| | Iconify | Latest | 200K+ universal |
| **Theming** | Tailwind CSS | 3.4 | Utility-first CSS |
| | CSS Variables | Native | Theme tokens |
| **Accessibility** | axe DevTools | Latest | Accessibility testing |
| | jest-axe | Latest | Automated a11y tests |
| **Documentation** | Storybook | 8.x | Component docs |
| | Figma MCP | Latest | Design-to-code |

---

## Module Cross-Reference

### [Component Architecture](modules/component-architecture.md)
**Focus**: Component architecture and implementation patterns

**Key Topics**:
- Atomic Design (Atoms, Molecules, Organisms)
- React 19 + Server Components
- Vue 3.5 + Composition API
- shadcn/ui component patterns
- Props API design
- Storybook integration

**When to Use**: Building or architecting UI component libraries

---

### [Design System Tokens](modules/design-system-tokens.md)
**Focus**: Design token architecture and tooling

**Key Topics**:
- W3C DTCG 2025.10 token structure
- Style Dictionary configuration
- Multi-theme support
- Figma MCP workflow
- Semantic naming conventions

**When to Use**: Setting up design system foundations

---

### [Accessibility WCAG](modules/accessibility-wcag.md)
**Focus**: WCAG 2.2 compliance and accessibility testing

**Key Topics**:
- Color contrast validation (4.5:1 AA, 7:1 AAA)
- Keyboard navigation patterns
- Screen reader optimization (ARIA)
- Focus management
- Automated testing (jest-axe)

**When to Use**: Ensuring accessibility compliance

---

### [Icon Libraries](modules/icon-libraries.md)
**Focus**: Icon library selection and integration

**Key Topics**:
- 10+ library comparison (Lucide, React Icons, Tabler, Iconify)
- Bundle size optimization
- Tree-shaking strategies
- Type-safe icon components
- Performance patterns

**When to Use**: Integrating icon systems with optimal bundle sizes

---

### [Theming System](modules/theming-system.md)
**Focus**: Theme system implementation

**Key Topics**:
- CSS variable architecture
- Light/dark mode switching
- System preference detection
- Brand customization
- Tailwind CSS integration

**When to Use**: Implementing customizable theming

---

### [Examples](examples.md)
**Focus**: Practical code examples

**Key Topics**:
- Button component (React, Vue)
- Form validation (Zod + React Hook Form)
- Data table (TanStack Table)
- Modal dialog (focus trap)
- Theme provider
- Icon usage patterns

**When to Use**: Reference implementations

---

### [Reference](reference.md)
**Focus**: External documentation links

**Key Topics**:
- Official documentation (DTCG, WCAG, Figma, Storybook)
- Library references (React, Tailwind, Radix UI)
- Tool documentation (Style Dictionary, jest-axe)
- Best practice guides

**When to Use**: Finding official resources

---

## Best Practices

**DO**:
- ✅ Use semantic design tokens (`color.primary.500` not `blue-500`)
- ✅ Follow Atomic Design hierarchy (Atoms → Molecules → Organisms)
- ✅ Verify 4.5:1 contrast ratio for all text (WCAG AA)
- ✅ Implement keyboard navigation for all interactive elements
- ✅ Tree-shake icons (import specific, avoid `import *`)
- ✅ Use CSS variables for theme customization
- ✅ Document all props with TypeScript types
- ✅ Test components with jest-axe for accessibility

**DON'T**:
- ❌ Hardcode colors (use design tokens)
- ❌ Skip ARIA labels on icon-only buttons
- ❌ Import entire icon libraries (`import * from 'lucide-react'`)
- ❌ Forget to test dark mode
- ❌ Ignore keyboard navigation
- ❌ Skip focus indicators
- ❌ Use inline styles (use Tailwind classes)
- ❌ Forget loading states

---

## Works Well With

**Skills**:
- `moai-lang-unified` - TypeScript and JavaScript best practices
- `moai-foundation-core` - TRUST 5 quality validation
- `moai-library-nextra` - Documentation generation
- `moai-library-shadcn` - shadcn/ui specialized patterns (complementary)

**Agents**:
- `code-frontend` - Frontend component implementation
- `design-uiux` - Design system architecture
- `mcp-figma` - Figma integration workflows
- `core-quality` - Accessibility and quality validation

**Commands**:
- `/moai:2-run` - TDD implementation cycle
- `/moai:3-sync` - Documentation generation

---

## Migration from Legacy Skills

This skill consolidates 4 previous skills:

**moai-component-designer** → [Component Architecture](modules/component-architecture.md)
- Atomic Design patterns
- React 19 / Vue 3.5 examples
- Component architecture

**moai-design-systems** → [Design System Tokens](modules/design-system-tokens.md) + [Accessibility WCAG](modules/accessibility-wcag.md)
- DTCG token architecture
- Figma MCP workflows
- WCAG 2.2 compliance

**moai-icons-vector** → [Icon Libraries](modules/icon-libraries.md)
- Icon library comparison
- Performance optimization
- Integration patterns

**moai-library-shadcn** (partially) → [Component Architecture](modules/component-architecture.md) + [Theming System](modules/theming-system.md)
- shadcn/ui patterns
- Theme system
- Component composition

**Note**: `moai-library-shadcn` remains as a complementary skill for shadcn/ui-specific advanced patterns.

---

## Official Resources

- W3C DTCG: https://designtokens.org
- WCAG 2.2: https://www.w3.org/WAI/WCAG22/quickref/
- React 19: https://react.dev
- Tailwind CSS: https://tailwindcss.com
- Radix UI: https://www.radix-ui.com
- shadcn/ui: https://ui.shadcn.com
- Storybook: https://storybook.js.org
- Figma MCP: https://help.figma.com/hc/en-us/articles/32132100833559
- Style Dictionary: https://styledictionary.com
- Lucide Icons: https://lucide.dev
- Iconify: https://iconify.design

---

**Last Updated**: 2025-11-26
**Status**: Production Ready
**Version**: 1.0.0