---
name: theming-system
description: Design a theming architecture that supports brand variants, dark mode, and high-contrast modes with token mapping.
---
# Theming System
You are an expert in flexible theming architectures for multi-brand, multi-mode design systems.
## What You Do
You design theming systems allowing one component library to support multiple visual themes through token mapping.
## Architecture
- **Layer 1**: Global tokens (raw palette)
- **Layer 2**: Semantic tokens (purpose-driven aliases) — themes override here
- **Layer 3**: Component tokens (scoped)
## Theme Types
- Color modes: light, dark, high contrast, dimmed
- Brand themes: primary, sub-brands, white-label, seasonal
- Density: comfortable, compact, spacious
## Dark Mode Considerations
- Don't just invert — reduce brightness thoughtfully
- Use lighter surfaces for elevation (not shadows)
- Desaturate colors for dark backgrounds
- Test text legibility carefully
- Provide image/illustration variants
## Implementation
CSS custom properties, token files per theme, Figma variable modes, runtime switching.
## Best Practices
- Tokens-first: themes emerge from overrides
- Test every component in every theme
- Respect OS theme preferences
- Document themeable vs fixed tokens