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tickets/032-greyscale-theme-rework.md

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+# 032 — Rework colour themes as greyscale equivalents with accent-only colour
+
+## Summary
+
+Today's colour themes (`webapp/src/index.css`) only vary `--c-accent`/
+`--c-accent-soft`/`--c-accent-text` per theme (`html.red`, `.green`, `.blue`,
+`.yellow`, `.pink`, `.orange` at lines 97-130) — every theme shares the same
+dark `:root` surfaces/borders/text. `html.grey` (lines 75-95) is a Tailwind
+slate palette, which reads blue-tinted rather than neutral. The wishlist
+wants: `light`/`dark` as true black-and-white inverses of each other, `grey`
+as true neutral greyscale, and every other named theme (`red`/`green`/etc.)
+to desaturate its named hue to the matching greyscale lightness for
+surfaces/borders/text, reserving actual saturated colour for accents only.
+
+## Scope
+
+- `:root` (dark) and `html.light`: convert to a true black/white greyscale
+  scale (surfaces, borders, text all `#000`–`#fff` greys, inverted between
+  the two), replacing the current warm/cool-tinted neutrals.
+- `html.grey`: replace the slate-derived palette (lines 76-90) with the same
+  neutral greyscale scale as dark/light (i.e. `grey` becomes the canonical
+  greyscale theme other themes derive from), keeping only its own accent
+  distinct if one is still wanted.
+- `red`/`green`/`blue`/`yellow`/`pink`/`orange`: for each, desaturate that
+  hue to compute a matching greyscale lightness scale for
+  `--c-surface-*`/`--c-border-*`/`--c-text-*` (e.g. convert the hue to HSL,
+  zero the saturation, keep the lightness steps), then keep that theme's
+  actual saturated colour only on `--c-accent*`.
+- Document the derivation (e.g. a short comment or a small script/table) so a
+  new themed variant can be added consistently later.
+
+## Acceptance criteria
+
+- `light` and `dark` are literal greyscale inverses of each other (every
+  `--c-*` value in one is the other's lightness mirrored, no hue).
+- `grey` uses a neutral (zero-saturation) scale, not a blue-tinted one.
+- Each named colour theme's surfaces/borders/text render as neutral greys at
+  a lightness matching that colour's own luminance, with the named colour
+  visible only via `--c-accent*`.
+
+## Depends on
+
+None.
+
+## Depended on by
+
+- [033 — Downloadable/uploadable custom themes](033-custom-theme-download-upload.md)