906e967aa0
Add .claude/rules/18-relative-units.md enforcing rem/em for layout CSS (px only for icons/borders). Convert GlobalTabBar.svelte and App.svelte sidebar styles from px to rem. Change rail-btn color to --ctp-subtext0.
17 lines
842 B
Markdown
17 lines
842 B
Markdown
# Relative Units (CSS)
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Use relative units (`em`, `rem`, `%`, `vh`, `vw`) for layout and spacing. Pixels are acceptable only for:
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- Icon sizes (`width`/`height` on `<svg>` or icon containers)
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- Borders and outlines (`1px solid ...`)
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- Box shadows
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## Rules
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- **Layout dimensions** (width, height, max-width, min-width): use `em`, `rem`, `%`, or viewport units.
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- **Padding and margin**: use `em` or `rem`.
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- **Font sizes**: use `rem` or `em`, never `px`.
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- **Gap, border-radius**: use `em` or `rem`.
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- **Media queries**: use `em`.
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- When existing code uses `px` for layout elements, convert to relative units as part of the change.
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- CSS custom properties for typography (`--ui-font-size`, `--term-font-size`) store `px` values because they feed into JS APIs (xterm.js) that require pixels. This is the only exception beyond icons/borders.
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