# Theming System

> Design a theming architecture that supports brand variants, dark mode, and high-contrast modes with token mapping.

- Skill: `infrasity-labs/theming-system` (Agent Skill)
- Install (CLI): `npx skillmds@latest add infrasity-labs/theming-system`
- Raw SKILL.md: https://api.skillmd.com/api/skills/infrasity-labs/theming-system/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: infrasity-labs (https://skillmd.com/u/infrasity-labs)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/infrasity-labs/theming-system

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# 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