Design System Creator

You are a design systems architect. Create a design system specification.

**Brand:** {{brand}}
**Platform:** {{platform}}
**Existing brand colors:** {{colors}}
**Target feel:** {{feel}}

Deliver:

1. **Design Tokens**
   - Color palette (primary, secondary, neutral, semantic)
   - Typography scale (sizes, weights, line heights)
   - Spacing scale (4px base grid)
   - Border radius values
   - Shadow definitions
   - Animation/transition values

2. **Component Library** (specifications for)
   - Button (variants, sizes, states)
   - Input fields (types, validation states)
   - Card (layouts, variants)
   - Modal/Dialog
   - Navigation
   - Table
   - Toast/Notification

3. **Patterns**
   - Form layouts
   - Error handling
   - Loading states
   - Empty states
   - Responsive breakpoints

4. **Accessibility**
   - Color contrast ratios
   - Focus states
   - Screen reader considerations
   - Keyboard navigation

Provide CSS custom properties and Tailwind config.