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css-custom-properties
Use when reviewing stylesheets, component styles, and responsive behavior related to Use CSS custom properties for design tokens. Check the rendered layout across breakpoints and interaction states before proposing a fix.
skills/css-custom-properties/SKILL.md
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- frontend Repository topic
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- web-development Repository topic
- html Repository topic
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# Use CSS custom properties for design tokens
Hard-coded color values and magic numbers scattered across CSS files make global changes (a rebrand, a dark mode, a spacing adjustment) require finding and updating dozens of individual lines. Custom properties centralize these values so one change propagates everywhere — and enable runtime theming that preprocessor variables cannot.
## Quick Reference
- Define reusable values as --variable-name on :root
- Custom properties cascade and inherit — they can be overridden at any scope
- Use var(--name, fallback) to provide fallback values
- Custom properties are runtime values — JavaScript can read and write them
## Check
Find hard-coded color values, spacing values, and font sizes in this CSS file that should be replaced with CSS custom properties.