Individual skill

dark-mode-css

Use when reviewing stylesheets, component styles, and responsive behavior related to Support dark mode with prefers-color-scheme. Check the rendered layout across breakpoints and interaction states before proposing a fix.

skills/dark-mode-css/SKILL.md

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frontend Repository topic
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guidelines Repository topic
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web-development Repository topic
html Repository topic
css Repository topic
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# Support dark mode with prefers-color-scheme

More than half of users prefer dark mode for reduced eye strain, especially in low-light environments. Users with photosensitivity rely on it. Implementing dark mode via prefers-color-scheme respects the user's OS preference without them needing to find a toggle, and CSS custom properties make it a clean, maintainable addition rather than a disruptive refactor.

## Quick Reference

- Use @media (prefers-color-scheme: dark) to apply dark mode styles
- Define light/dark colors as CSS custom properties on :root for easy switching
- Support a manual toggle by storing preference in localStorage and setting a data-theme attribute
- Ensure dark mode colors maintain WCAG contrast ratios

## Check

Check if this CSS supports dark mode. Look for prefers-color-scheme usage or a data-theme attribute pattern. Identify any hard-coded colors that would look wrong in dark mode.