{"id":"e6ee3918-61ad-4aed-bed7-e7f915debe23","shortId":"8NwN2b","kind":"skill","title":"radix-ui-design-system","tagline":"Build accessible design systems with Radix UI primitives. Headless component customization, theming strategies, and compound component patterns for production-grade UI libraries.","description":"# Radix UI Design System\n\nBuild production-ready, accessible design systems using Radix UI primitives with full customization control and zero style opinions.\n\n## Overview\n\nRadix UI provides unstyled, accessible components (primitives) that you can customize to match any design system. This skill guides you through building scalable component libraries with Radix UI, focusing on accessibility-first design, theming architecture, and composable patterns.\n\n**Key Strengths:**\n- **Headless by design**: Full styling control without fighting defaults\n- **Accessibility built-in**: WAI-ARIA compliant, keyboard navigation, screen reader support\n- **Composable primitives**: Build complex components from simple building blocks\n- **Framework agnostic**: Works with React, but styles work anywhere\n\n## When to Use This Skill\n\n- Creating a custom design system from scratch\n- Building accessible UI component libraries\n- Implementing complex interactive components (Dialog, Dropdown, Tabs, etc.)\n- Migrating from styled component libraries to unstyled primitives\n- Setting up theming systems with CSS variables or Tailwind\n- Need full control over component behavior and styling\n- Building applications requiring WCAG 2.1 AA/AAA compliance\n\n## Do not use this skill when\n\n- You need pre-styled components out of the box (use shadcn/ui, Mantine, etc.)\n- Building simple static pages without interactivity\n- The project doesn't use React 16.8+ (Radix requires hooks)\n- You need components for frameworks other than React\n\n---\n\n## Core Principles\n\n### 1. Accessibility First\n\nEvery Radix primitive is built with accessibility as the foundation:\n\n- **Keyboard Navigation**: Full keyboard support (Tab, Arrow keys, Enter, Escape)\n- **Screen Readers**: Proper ARIA attributes and live regions\n- **Focus Management**: Automatic focus trapping and restoration\n- **Disabled States**: Proper handling of disabled and aria-disabled\n\n**Rule**: Never override accessibility features. Enhance, don't replace.\n\n### 2. Headless Architecture\n\nRadix provides **behavior**, you provide **appearance**:\n\n```tsx\n// ❌ Don't fight pre-styled components\n\n \n\n {/* Portal renders outside DOM hierarchy */}\n \n {/* Overlay (backdrop) */}\n \n \n {/* Content (modal) */}\n \n Title\n Description\n \n {/* Your content here */}\n \n \n \n \n \n \n \n );\n}\n```\n\n---\n\n## Theming Strategies\n\n### Strategy 1: CSS Variables (Framework-Agnostic)\n\n**Best for**: Maximum portability, SSR-friendly\n\n```css\n/* globals.css */\n:root {\n --color-primary: 220 90% 56%;\n --color-surface: 0 0% 100%;\n --radius-base: 0.5rem;\n --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);\n}\n\n[data-theme=\"dark\"] {\n --color-primary: 220 90% 66%;\n --color-surface: 222 47% 11%;\n}\n```\n\n```tsx\n// Component.tsx\n\n```\n\n### Strategy 2: Tailwind + CVA (Class Variance Authority)\n\n**Best for**: Tailwind projects, variant-heavy components\n\n```tsx\n// button.tsx\nimport { cva, type VariantProps } from 'class-variance-authority';\nimport { cn } from '@/lib/utils';\n\nconst buttonVariants = cva(\n // Base styles\n \"inline-flex items-center justify-center rounded-md font-medium transition-colors focus-visible:outline-none disabled:pointer-events-none disabled:opacity-50\",\n {\n variants: {\n variant: {\n default: \"bg-primary text-primary-foreground hover:bg-primary/90\",\n destructive: \"bg-destructive text-destructive-foreground hover:bg-destructive/90\",\n outline: \"border border-input bg-background hover:bg-accent\",\n ghost: \"hover:bg-accent hover:text-accent-foreground\",\n },\n size: {\n default: \"h-10 px-4 py-2\",\n sm: \"h-9 rounded-md px-3\",\n lg: \"h-11 rounded-md px-8\",\n icon: \"h-10 w-10\",\n },\n },\n defaultVariants: {\n variant: \"default\",\n size: \"default\",\n },\n }\n);\n\ninterface ButtonProps extends VariantProps {\n children: React.ReactNode;\n}\n\nexport function Button({ variant, size, children }: ButtonProps) {\n return (\n \n );\n}\n```\n\n### Strategy 3: Stitches (CSS-in-JS)\n\n**Best for**: Runtime theming, scoped styles\n\n```tsx\nimport { styled } from '@stitches/react';\nimport * as Dialog from '@radix-ui/react-dialog';\n\nconst StyledContent = styled(Dialog.Content, {\n backgroundColor: '$surface',\n borderRadius: '$md',\n padding: '$6',\n \n variants: {\n size: {\n small: { width: '300px' },\n medium: { width: '500px' },\n large: { width: '700px' },\n },\n },\n \n defaultVariants: {\n size: 'medium',\n },\n});\n```\n\n---\n\n## Component Patterns\n\n### Pattern 1: Compound Components with Context\n\n**Use case**: Share state between primitive parts\n\n```tsx\n// Select.tsx\nimport * as Select from '@radix-ui/react-select';\nimport { CheckIcon, ChevronDownIcon } from '@radix-ui/react-icons';\n\nexport function CustomSelect({ items, placeholder, onValueChange }) {\n return (\n \n \n \n \n \n \n \n\n \n \n \n {items.map((item) => (\n \n {item.label}\n \n \n \n \n ))}\n \n \n \n \n );\n}\n```\n\n### Pattern 2: Polymorphic Components with `asChild`\n\n**Use case**: Render as different elements without losing behavior\n\n```tsx\n// ✅ Render as Next.js Link but keep Radix behavior\n\n Open Settings\n\n\n// ✅ Render as custom component\n\n }>Action\n\n```\n\n**Why `asChild` matters**: Prevents nested button/link issues in accessibility tree.\n\n### Pattern 3: Controlled vs Uncontrolled\n\n```tsx\n// Uncontrolled (Radix manages state)\n\n Tab 1\n\n\n// Controlled (You manage state)\nconst [activeTab, setActiveTab] = useState('tab1');\n\n\n Tab 1\n\n```\n\n**Rule**: Use controlled when you need to sync with external state (URL, Redux, etc.).\n\n### Pattern 4: Animation with Framer Motion\n\n```tsx\nimport * as Dialog from '@radix-ui/react-dialog';\nimport { motion, AnimatePresence } from 'framer-motion';\n\nexport function AnimatedDialog({ open, onOpenChange }) {\n return (\n \n \n \n {open && (\n <>\n \n \n \n \n \n \n {/* Content */}\n \n \n \n )}\n \n \n \n );\n}\n```\n\n---\n\n## Common Primitives Reference\n\n### Dialog (Modal)\n\n```tsx\n {/* State container */}\n {/* Opens dialog */}\n {/* Renders in portal */}\n {/* Backdrop */}\n {/* Modal content */}\n {/* Required for a11y */}\n {/* Required for a11y */}\n {/* Closes dialog */}\n \n \n\n```\n\n### Dropdown Menu\n\n```tsx\n\n \n \n \n \n \n \n \n \n \n {/* Nested menus */}\n \n \n \n \n \n\n```\n\n### Tabs\n\n```tsx\n\n \n \n \n \n \n \n\n```\n\n### Tooltip\n\n```tsx\n\n \n \n \n \n Tooltip text\n \n \n \n \n\n```\n\n### Popover\n\n```tsx\n\n \n \n \n Content\n \n \n \n \n\n```\n\n---\n\n## Accessibility Checklist\n\n### Every Component Must Have:\n\n- [ ] **Focus Management**: Visible focus indicators on all interactive elements\n- [ ] **Keyboard Navigation**: Full keyboard support (Tab, Arrows, Enter, Esc)\n- [ ] **ARIA Labels**: Meaningful labels for screen readers\n- [ ] **Color Contrast**: WCAG AA minimum (4.5:1 for text, 3:1 for UI)\n- [ ] **Error States**: Clear error messages with `aria-invalid` and `aria-describedby`\n- [ ] **Loading States**: Proper `aria-busy` during async operations\n\n### Dialog-Specific:\n- [ ] `Dialog.Title` is present (required for screen readers)\n- [ ] `Dialog.Description` provides context\n- [ ] Focus trapped inside modal when open\n- [ ] Escape key closes dialog\n- [ ] Focus returns to trigger on close\n\n### Dropdown-Specific:\n- [ ] Arrow keys navigate items\n- [ ] Type-ahead search works\n- [ ] First/last item wrapping behavior\n- [ ] Selected state indicated visually and with ARIA\n\n---\n\n## Best Practices\n\n### ✅ Do This\n\n1. **Always use `asChild` to avoid wrapper divs**\n ```tsx\n \n \n \n ```\n\n2. **Provide semantic HTML**\n ```tsx\n \n
\n {/* content */}\n
\n \n ```\n\n3. **Use CSS variables for theming**\n ```css\n .dialog-content {\n background: hsl(var(--surface));\n color: hsl(var(--on-surface));\n }\n ```\n\n4. **Compose primitives for complex components**\n ```tsx\n function CommandPalette() {\n return (\n \n \n {/* Radix Combobox inside Dialog */}\n \n \n );\n }\n ```\n\n### ❌ Don't Do This\n\n1. **Don't skip accessibility parts**\n ```tsx\n // ❌ Missing Title and Description\n \n
Content
\n \n ```\n\n2. **Don't fight the primitives**\n ```tsx\n // ❌ Overriding internal behavior\n e.stopPropagation()}>\n ```\n\n3. **Don't mix controlled and uncontrolled**\n ```tsx\n // ❌ Inconsistent state management\n \n ```\n\n4. **Don't ignore keyboard navigation**\n ```tsx\n // ❌ Disabling keyboard behavior\n e.preventDefault()}>\n ```\n\n---\n\n## Real-World Examples\n\n### Example 1: Command Palette (Combo Dialog)\n\n```tsx\nimport * as Dialog from '@radix-ui/react-dialog';\nimport { Command } from 'cmdk';\n\nexport function CommandPalette() {\n const [open, setOpen] = useState(false);\n\n useEffect(() => {\n const down = (e: KeyboardEvent) => {\n if (e.key === 'k' && (e.metaKey || e.ctrlKey)) {\n e.preventDefault();\n setOpen((open) => !open);\n }\n };\n document.addEventListener('keydown', down);\n return () => document.removeEventListener('keydown', down);\n }, []);\n\n return (\n \n \n \n \n \n \n \n No results found.\n \n Calendar\n Search Emoji\n \n \n \n \n \n \n );\n}\n```\n\n### Example 2: Dropdown Menu with Icons\n\n```tsx\nimport * as DropdownMenu from '@radix-ui/react-dropdown-menu';\nimport { DotsHorizontalIcon } from '@radix-ui/react-icons';\n\nexport function ActionsMenu() {\n return (\n \n \n \n \n\n \n \n \n Edit\n \n \n Duplicate\n \n \n \n Delete\n \n \n \n \n );\n}\n```\n\n### Example 3: Form with Radix Select + React Hook Form\n\n```tsx\nimport * as Select from '@radix-ui/react-select';\nimport { useForm, Controller } from 'react-hook-form';\n\ninterface FormData {\n country: string;\n}\n\nexport function CountryForm() {\n const { control, handleSubmit } = useForm();\n\n return (\n
console.log(data))}>\n (\n \n \n \n \n \n \n \n \n \n United States\n Canada\n United Kingdom\n \n \n \n \n )}\n />\n \n \n );\n}\n```\n\n---\n\n## Troubleshooting\n\n### Problem: Dialog doesn't close on Escape key\n\n**Cause**: `onEscapeKeyDown` event prevented or `open` state not synced\n\n**Solution**:\n```tsx\n\n {/* Don't prevent default on escape */}\n\n```\n\n### Problem: Dropdown menu positioning is off\n\n**Cause**: Parent container has `overflow: hidden` or transform\n\n**Solution**:\n```tsx\n// Use Portal to render outside overflow container\n\n \n\n```\n\n### Problem: Animations don't work\n\n**Cause**: Portal content unmounts immediately\n\n**Solution**:\n```tsx\n// Use forceMount + AnimatePresence\n\n \n {open && }\n \n\n```\n\n### Problem: TypeScript errors with `asChild`\n\n**Cause**: Type inference issues with polymorphic components\n\n**Solution**:\n```tsx\n// Explicitly type your component\n\n \n\n```\n\n---\n\n## Performance Optimization\n\n### 1. Code Splitting\n\n```tsx\n// Lazy load heavy primitives\nconst Dialog = lazy(() => import('@radix-ui/react-dialog'));\nconst DropdownMenu = lazy(() => import('@radix-ui/react-dropdown-menu'));\n```\n\n### 2. Portal Container Reuse\n\n```tsx\n// Create portal container once\n\n {/* All tooltips share portal container */}\n ...\n ...\n\n```\n\n### 3. Memoization\n\n```tsx\n// Memoize expensive render functions\nconst SelectItems = memo(({ items }) => (\n items.map((item) => )\n));\n```\n\n---\n\n## Integration with Popular Tools\n\n### shadcn/ui (Built on Radix)\n\nshadcn/ui is a collection of copy-paste components built with Radix + Tailwind.\n\n```bash\nnpx shadcn-ui@latest init\nnpx shadcn-ui@latest add dialog\n```\n\n**When to use shadcn vs raw Radix**:\n- Use shadcn: Quick prototyping, standard designs\n- Use raw Radix: Full customization, unique designs\n\n### Radix Themes (Official Styled System)\n\n```tsx\nimport { Theme, Button, Dialog } from '@radix-ui/themes';\n\nfunction App() {\n return (\n \n \n \n );\n}\n```\n\n---\n\n## Related Skills\n\n- `@tailwind-design-system` - Tailwind + Radix integration patterns\n- `@react-patterns` - React composition patterns\n- `@frontend-design` - Overall frontend architecture\n- `@accessibility-compliance` - WCAG compliance testing\n\n---\n\n## Resources\n\n### Official Documentation\n- [Radix UI Docs](https://www.radix-ui.com/primitives)\n- [Radix Colors](https://www.radix-ui.com/colors) - Accessible color system\n- [Radix Icons](https://www.radix-ui.com/icons) - Icon library\n\n### Community Resources\n- [shadcn/ui](https://ui.shadcn.com) - Component collection\n- [Radix UI Discord](https://discord.com/invite/7Xb99uG) - Community support\n- [CVA Documentation](https://cva.style/docs) - Variant management\n\n### Examples\n- [Radix Playground](https://www.radix-ui.com/primitives/docs/overview/introduction#try-it-out)\n- [shadcn/ui Source](https://github.com/shadcn-ui/ui) - Production examples\n\n---\n\n## Quick Reference\n\n### Installation\n```bash\nnpm install @radix-ui/react-{primitive-name}\n```\n\n### Basic Pattern\n```tsx\n\n \n \n \n \n\n```\n\n### Key Props\n- `asChild` - Render as child element\n- `defaultValue` - Uncontrolled default\n- `value` / `onValueChange` - Controlled state\n- `open` / `onOpenChange` - Open state\n- `side` / `align` - Positioning\n\n---\n\n**Remember**: Radix gives you **behavior**, you give it **beauty**. Accessibility is built-in, customization is unlimited.\n\n## Limitations\n- Use this skill only when the task clearly matches the scope described above.\n- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.\n- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are 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