Responsive Design System Creator

I need a responsive design system for my web application.

**Brand Guidelines:**
- Primary colors: [hex codes]
- Secondary colors: [hex codes]
- Typography: [font families]

**Target Devices:**
- Mobile: [specific sizes if any]
- Tablet: [specific sizes]
- Desktop: [min/max widths]

**Design Preferences:**
- Spacing scale: [4px/8px base]
- Border radius style: [sharp/rounded/pill]
- Shadow depth: [flat/subtle/prominent]

**Implementation:**
- CSS approach: [CSS custom properties/Tailwind/Sass]
- Component library: [if any]

Please create:
1. Breakpoint system with media queries
2. Spacing scale (padding/margin)
3. Typography scale with responsive sizing
4. Color palette with semantic naming
5. Component spacing guidelines
6. Grid system configuration
7. Documentation for team usage