Closes the two color-quality items from THEMING_AUDIT P3.
P3-2 · forced-colors (Windows High Contrast): under @media (forced-colors: active) the
browser auto-maps borders/text/backgrounds to system colors BUT drops box-shadow — so
the box-shadow focus ring (--focus-ring) vanishes and keyboard focus disappears. The
foundation now always emits a system-colored outline fallback:
@media (forced-colors: active) {
:focus-visible { outline: 2px solid Highlight; outline-offset: 2px; }
}
Components that already focus via outline (e.g. Button) keep theirs by specificity; this
is the fallback for the box-shadow ones. renderForcedColorsBlock in render-css.ts.
P3-3 · role border ramp: the per-role `border` slot moved step 6 -> 7. In Radix's
functional scale 6 is a subtle separator and 7 is the UI element border; step 6 read
washed-out on real element borders (outline/surface/controls). element/hover/active
(3/4/5) stay — Radix-canonical for component bg. DEFAULT_COLOR_ROLE_SLOT_STEPS.
- generated/base.css regenerated (forced-colors block + --color-{role}-border -> step 7).
- Verified in browser: --color-primary-border now resolves to primitive-7 (oklch 0.80
0.092 vs the softer step-6 0.86 0.072); checkbox borders render defined, not broken.
- test: renderStaticCss emits the forced-colors outline block.
- docs: THEMING §28 + audit P3-1/2/3 marked resolved + README ref row.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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