Tommy D. Rossi
67 lines
2.2 KiB
Markdown
67 lines
2.2 KiB
Markdown
# Website
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## Tailwind dark mode
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Dark mode uses `prefers-color-scheme` media query, configured in `globals.css`:
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```css
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@custom-variant dark (@media (prefers-color-scheme: dark));
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```
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### `@variant dark` rules
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1. **Must be nested inside a selector**, never at the top level:
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```css
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/* WRONG - silently produces no output */
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@variant dark {
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.my-class {
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color: white;
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}
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}
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/* CORRECT - nest inside the selector */
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.my-class {
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@variant dark {
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color: white;
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}
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}
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/* CORRECT - define variables inside :root */
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:root {
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@variant dark {
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--my-var: white;
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}
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}
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```
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2. **Only works in CSS files that are part of the Tailwind compilation chain.** Files must be imported via CSS `@import` from `globals.css` (which has `@import "tailwindcss"`). JS/TS `import "file.css"` in route files does NOT go through Tailwind — `@variant dark` will silently fail.
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```css
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/* globals.css — this is the Tailwind entry point */
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@import 'tailwindcss';
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@import './editorial.css'; /* editorial page styles (class names, layout) */
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@import './editorial-prism.css'; /* prism syntax highlighting */
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@custom-variant dark (@media (prefers-color-scheme: dark));
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```
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If you create a new CSS file that needs `@variant dark`, add it as a CSS `@import` in `globals.css`. Do NOT import it from a `.tsx` file.
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### For many dark overrides, use CSS variables on `:root`
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For files with many dark mode selectors (like prism syntax colors), define CSS variables in `:root { @variant dark { ... } }` and reference them in selectors. This avoids repeating `@variant dark` in every rule.
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## Images must not cause layout shift
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Every `<img>` must have explicit `width` and `height` attributes matching the intrinsic pixel dimensions of the source file. Add `style={{ height: "auto" }}` to keep it responsive. This lets the browser reserve the correct aspect ratio space before the image loads, preventing layout shift.
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```tsx
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<img src='/photo.png' width={1280} height={800} style={{ maxWidth: '100%', height: 'auto' }} />
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```
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Use `sips -g pixelWidth -g pixelHeight <file>` to get dimensions on macOS.
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## No localStorage dark mode toggle
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There is no JS-based `.dark` class toggle. Do not add inline scripts to toggle `.dark` on `<html>`. The site follows the OS preference only via `prefers-color-scheme`.
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