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swarm-ui: fix WCAG contrast failures in the light-theme accent slots

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argus review: the literal Catppuccin Latte accent hexes (base08-0F)
fail badly as StatusChip fill-text (green/amber/red/yellow on
--purple-dim/base03: 1.4:1-3:1, need 4.5:1) and even as plain text on
--bg/base00 in the agent/dashboard packages that also import this file
(2.3:1-4.8:1). Root cause: Latte's own accents are calibrated against
Lattes near-white base/crust, not a mid-gray surface1; the Mocha row
does not hit this because Mochas pastel accents are already light, so
they contrast fine against a dark surface1 - Lattes saturated-but-mid
accents do not have the same headroom against Lattes own lighter
surface1.

Fix: darken each accent slot from stock Latte (same hue/saturation,
lower HSL lightness via binary search) until real WCAG contrast against
base03 clears 4.5:1 with margin - verified this also clears >7:1
against base00, so both the swarm-ui chip case and the plain-text case
elsewhere are covered by one set of values. base00-07 stay stock Latte
(no contrast role, just surfaces/foreground). Yellow and peach read
closer to olive/brown than a bright yellow/orange once darkened this
far - an inherent property of darkening a warm hue in sRGB, not a
mapping mistake; boosting saturation further did not rescue it
(checked).

Verified with headless-chromium screenshots against the built swarm-ui
bundle: StatusChip text (the exact case argus flagged) and every chip
tone on /components now read clearly.
This commit is contained in:
iris 2026-08-18 22:57:47 +02:00 • committed by mara
commit 72e087b086
2 changed files with 53 additions and 20 deletions
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15
docs/web-ui/css-vars.md
View file

@ -18,12 +18,17 @@ for the raw `--baseNN` slots directly. (`base.css` holds only the shared
`body` typography — it references the palette but no longer defines it.) `body` typography — it references the palette but no longer defines it.)
`colors.css` ships two rows of the same 16 slots: an unconditional `colors.css` ships two rows of the same 16 slots: an unconditional
Catppuccin Mocha (dark) default, and a Catppuccin Latte (light) row gated Catppuccin Mocha (dark) default, and a Catppuccin-Latte-derived (light)
behind `@media (prefers-color-scheme: light)` — both ported through the row gated behind `@media (prefers-color-scheme: light)` — both use the
identical slot mapping, so which row is active never changes what a slot identical slot mapping, so which row is active never changes what a slot
means. This is the OS/browser-level default only; it's what a client with means. The light row's `base00`-`base07` (surfaces/foreground) are stock
no more specific theme decision gets (see "Theme swapping" below for how a Latte hexes; `base08`-`base0F` (the eight chromatic slots) are darkened
stylix deployment or a future per-user override supersede it). from stock Latte to actually clear WCAG AA against how this app uses
them (real contrast failures found in review — see the comment above
those declarations in `colors.css` for the numbers and why). This is the
OS/browser-level default only; it's what a client with no more specific
theme decision gets (see "Theme swapping" below for how a stylix
deployment or a future per-user override supersede it).
Both are deliberately standalone, not `@import`ed into the page bundles: Both are deliberately standalone, not `@import`ed into the page bundles:
each package re-exports them (`src/{colors,theme}.css` → each package re-exports them (`src/{colors,theme}.css` →

58
frontend/packages/shared/src/colors.css
View file

@ -30,13 +30,16 @@
--base0F: #f5c2e7; /* extra accent — pink */ --base0F: #f5c2e7; /* extra accent — pink */
} }
/* Light-mode default — Catppuccin Latte, the standard light complement /* Light-mode default. base00-07 (surfaces/foreground) are stock
to the Mocha defaults above, ported through the identical base16 Catppuccin Latte — no contrast issue there, they're the ends of the
slot mapping (down to the same base0C sky-over-teal substitution) so bg/fg scale. base08-0F (the eight chromatic "tone" slots: red through
a swap between the two rows never changes which semantic role a slot pink) are deliberately NOT stock Latte hexes — see the comment right
plays. This is a *default*, not a user preference store: it only above those declarations below for why; don't reuse stock Catppuccin
applies when nothing more specific has already decided the palette. Latte's own accent hexes there if this ever gets regenerated.
A stylix-generated colors.css (nix/host-modules/hive-c0re/theme.nix)
This is a *default*, not a user preference store: it only applies
when nothing more specific has already decided the palette. A
stylix-generated colors.css (nix/host-modules/hive-c0re/theme.nix)
replaces this entire file wholesale — a fixed, unconditional `:root` replaces this entire file wholesale — a fixed, unconditional `:root`
block with no media query in it at all — so a stylix-themed block with no media query in it at all — so a stylix-themed
deployment is naturally unaffected by, and never fights, this block. deployment is naturally unaffected by, and never fights, this block.
@ -59,13 +62,38 @@
--base05: #4c4f69; /* default foreground */ --base05: #4c4f69; /* default foreground */
--base06: #dc8a78; /* light foreground */ --base06: #dc8a78; /* light foreground */
--base07: #7287fd; /* lightest */ --base07: #7287fd; /* lightest */
--base08: #d20f39; /* red */ /* base08-0F: darkened from stock Catppuccin Latte's own accent
--base09: #fe640b; /* orange / peach */ hexes (same hue/saturation, lower HSL lightness), not a literal
--base0A: #df8e1d; /* yellow */ upstream port like base00-07 above. argus's review on this PR
--base0B: #40a02b; /* green */ computed real WCAG contrast ratios and found the literal Latte
--base0C: #04a5e5; /* cyan (our sky — note: Catppuccin's base0C is teal) */ accents fail badly as `StatusChip` fill-text (green/amber/red/
--base0D: #1e66f5; /* blue */ yellow on `--purple-dim`/base03: 1.4:1-3:1, need 4.5:1) and even
--base0E: #8839ef; /* magenta / mauve */ as plain text on `--bg`/base00 in the agent/dashboard packages
--base0F: #ea76cb; /* extra accent — pink */ that also consume this same file (2.3:1-4.8:1). Root cause:
Latte's own accent colors are calibrated against Latte's
near-white `base`/`crust`, not against a mid-gray `surface1` —
the Mocha row doesn't have this problem because Mocha's pastel
accents are already *light*, so they contrast fine against a
*dark* surface1; Latte's saturated-but-mid-brightness accents
don't have the equivalent headroom against Latte's own
(much lighter) surface1. Each value below was picked by holding
the stock Latte hue+saturation fixed and binary-searching HSL
lightness down to the point real contrast against base03 clears
4.5:1 with a small margin (also verified against base00: all
land above 7:1 there) — same hue identity, same base16 role,
just dark/saturated enough to actually be legible as filled-chip
or plain text either way. Yellow and peach read closer to
olive/brown than a bright yellow/orange once darkened this far —
an inherent property of darkening a warm hue in sRGB (Bezold-
Brücke shift), not a mapping mistake; boosting saturation
further didn't rescue it (verified). */
--base08: #9c0b2a; /* red */
--base09: #883201; /* orange / peach */
--base0A: #6d450e; /* yellow */
--base0B: #235818; /* green */
--base0C: #025374; /* cyan (our sky — note: Catppuccin's base0C is teal) */
--base0D: #0843b8; /* blue */
--base0E: #6311ce; /* magenta / mauve */
--base0F: #8f166e; /* extra accent — pink */
} }
} }