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Add a dark and light mode toggle to the header

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A sun and moon button at the end of the nav (and the Store's nav) swaps
the mode and remembers the choice in the browser. Until it is pressed the
site follows the device setting. A head script sets html[data-theme]
before first paint, so light styles now key off data-theme instead of a
media query, and motifs render both images with CSS showing one.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012aSbo2D1qP8cMFQCykf7kx
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Claude
2026-10-18 19:57:05 +00:00
parent 7aa2910b12
commit 4614cd25a0
15 changed files with 200 additions and 106 deletions
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docs/components.md
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@@ -76,6 +76,6 @@ import PageShell from "@gk/ui/components/PageShell.astro";
</PageShell>
```
The site is dark by default and turns light when the device is set to light (`prefers-color-scheme`). Colors come from the tokens in `tokens.css`, which has the light values too, so a component that uses `var(--gk-…)` needs nothing more. For a translucent color use a channel token, as in `rgba(var(--gk-gold-rgb), 0.35)`, never a hardcoded rgba. In SVG markup use `style="fill:var(--gk-gold)"`.
The site follows the device's light or dark setting until the visitor presses the sun and moon toggle in the header (`ThemeToggle`), which saves their choice in the browser. A script in PageShell's head sets `<html data-theme="light">` or `"dark"` before the page paints; without script the site stays dark. Style light mode with `:root[data-theme="light"]` (in a component, `:global(:root[data-theme="light"]) .x`), not a `prefers-color-scheme` media query, so the toggle can override it. Colors come from the tokens in `tokens.css`, which has the light values too, so a component that uses `var(--gk-…)` needs nothing more. For a translucent color use a channel token, as in `rgba(var(--gk-gold-rgb), 0.35)`, never a hardcoded rgba. In SVG markup use `style="fill:var(--gk-gold)"`.
Motif images come in a light recolor and, for seals, a gold foil version for each mode. Show a motif with `Motif` (or `Seal`), which picks the right file for the device; a plain `<img>` stays dark. Pass `foil` only to a seal standing alone at 120px or more and half opacity or more. After changing a motif SVG, run `node packages/ui/scripts/light-motifs.mjs` to rewrite the `light/`, `foil/` and `foil-light/` versions.
Motif images come in a light recolor and, for seals, a gold foil version for each mode. Show a motif with `Motif` (or `Seal`), which renders both files and shows the one for the current mode; a plain `<img>` stays dark. Pass `foil` only to a seal standing alone at 120px or more and half opacity or more. After changing a motif SVG, run `node packages/ui/scripts/light-motifs.mjs` to rewrite the `light/`, `foil/` and `foil-light/` versions.