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