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Saxon FletcherandDanny White
ec24d69369
Replaces abs and from for foreground colours to potentially improve browser compatibility <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Style** * Improved semantic color calculations for broader browser compatibility. * Refined foreground, muted, and tertiary text colors for more consistent theme rendering. * Improved surface overlay contrast across different tones. * Fine-tuned the light theme’s link color brightness for better visual balance. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Co-authored-by: Danny White <3104761+dnywh@users.noreply.github.com>
234 lines
11 KiB
CSS
234 lines
11 KiB
CSS
/*
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* Core semantic color system.
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*
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* Themes override the small set of inputs below; every semantic color is then
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* derived from them in OKLCH. The stepped numeric scales (brand / warning /
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* destructive / secondary) are NOT derived here — they live as per-theme values
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* in the theme files and are mapped to utilities in packages/config/css/theme.css.
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*/
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:root {
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/*
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* Hue inputs. A single --hue used to drive both the neutral surface/text ramp
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* and the brand, so the two could never drift apart. They are now split so a
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* theme can run, say, a cool-gray surface against the green brand:
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* --surface-hue tints backgrounds, text and borders (the neutral ramp)
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* --primary-hue is the brand hue that --primary is built from
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* Both default to --hue (Supabase green ≈159° in OKLCH), so a theme that only
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* sets --hue keeps surfaces and brand locked together as before; override
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* either one to let them diverge. */
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--hue: 159;
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--surface-hue: var(--hue);
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--primary-hue: var(--hue);
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/* Root defaults mirror the dark theme (the app's default appearance). */
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--chroma: 0.016;
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--surface: 0.17;
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--foreground-lightness: 0.95;
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/* How far muted/tertiary text sits from --surface toward --foreground-lightness
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(0 = surface, 1 = full foreground) at --contrast 0.5; themes override. */
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--muted-foreground-level: 0.8;
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--tertiary-foreground-level: 0.65;
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/*
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* Global contrast knob, 0 to 1. Default 0.5 is the comfortable baseline; 0 keeps
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* borders and accent barely visible over muted surfaces; 1 pushes them to full
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* strength. Foreground hits --foreground-lightness at 0.5; below that it eases
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* toward the surface down to --contrast-text-floor at 0. Muted and tertiary
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* foreground lightness sits at the theme base level (a surface→foreground mix) at
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* 0.5 and eases up toward foreground or down toward half that base as contrast moves.
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*
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* --contrast-delta is -1 at 0, 0 at 0.5, +1 at 1 — shared offset from baseline;
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* --contrast-up / --contrast-down are its positive / negative halves.
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* --contrast-border ramps [floor, 1] over --contrast and squares it so most of
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* the range lives toward full strength. ((delta + 1) / 2 simplifies to contrast.)
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*/
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--contrast: 0.5;
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--contrast-delta: calc((var(--contrast) - 0.5) / 0.5);
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/* positive and negative halves of the delta, reused below */
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--contrast-up: max(0, var(--contrast-delta));
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--contrast-down: max(0, calc(var(--contrast-delta) * -1));
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--contrast-text-floor: 0.9;
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--contrast-border-floor: 0.05;
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--contrast-text: calc(1 - (1 - var(--contrast-text-floor)) * var(--contrast-down));
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--contrast-border-linear: calc(
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var(--contrast-border-floor) + (1 - var(--contrast-border-floor)) * var(--contrast)
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);
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--contrast-border: calc(var(--contrast-border-linear) * var(--contrast-border-linear));
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/*
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* Surface elevation. Each surface steps its lightness away from --background
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* by `--elevation-step * ratio`, where the ratios are shared across themes and
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* the step is signed: positive brightens as surfaces rise, negative darkens.
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*
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* The default step reproduces the historical behavior (≈3% per level mixed
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* toward the foreground): dark themes brighten and the light baseline darkens.
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* The light theme overrides --elevation-step (and lowers --surface for
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* headroom) so its higher surfaces brighten toward white instead — giving a
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* single "higher = lighter" model in both modes. 0 = flat (no elevation).
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*/
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--elevation-1: 1;
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--elevation-2: 1.5;
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--elevation-3: 2;
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--elevation-4: 3;
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/* Signed span surface→foreground (+ in dark, − in light). */
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--tone-span: calc(var(--foreground-lightness) - var(--surface));
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--elevation-step: calc(var(--tone-span) * 0.04);
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/*
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* Foreground overlays for muted / accent / tertiary. Alpha is tuned so each level
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* matches the lightness delta of the same elevation ratio on --background; a
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* translucent --foreground layer then composites with whatever surface sits
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* beneath (lightens in dark, darkens in light). Steps: muted (e1) → accent
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* (e2) → tertiary (e3).
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*/
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/* max(span, -span) is equivalent to abs(span), but works across the browser
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versions supported by Tailwind v4. */
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--surface-overlay-unit: calc(
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var(--elevation-step) / max(var(--tone-span), calc(var(--tone-span) * -1))
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);
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--muted-alpha: calc(var(--surface-overlay-unit) * var(--elevation-1));
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--accent-alpha: calc(var(--surface-overlay-unit) * var(--elevation-2));
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--tertiary-alpha: calc(var(--surface-overlay-unit) * var(--elevation-3));
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/*
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* Status hues stay anchored to amber / red but pull a fraction of the way
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* toward the brand --primary-hue for harmony, then clamp to their perceptual
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* category so "warning" always reads amber and "destructive" always reads red
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* no matter what --primary-hue is. --status-hue-pull: 0 = fixed amber/red,
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* 1 = fully brand-relative. At the default --primary-hue the pull term is 0, so
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* these resolve to their bases (warning 75 / destructive 25 / info 288).
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* --brand-hue-reference is the --primary-hue at which pull is zero; keep it
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* equal to the default brand hue.
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* Warning sits at 75 (amber), not higher toward yellow — yellow can't darken
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* without going olive, so it loses contrast on light surfaces. Info is a violet
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* (matching the "no additional charge" badge); like the others it pulls a touch
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* with the brand --primary-hue but clamps so it always reads violet.
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*/
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--brand-hue-reference: 159;
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--status-hue-pull: 0.15;
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--warning-hue: clamp(
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65,
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calc(75 + (var(--primary-hue) - var(--brand-hue-reference)) * var(--status-hue-pull)),
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95
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);
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--destructive-hue: clamp(
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12,
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calc(25 + (var(--primary-hue) - var(--brand-hue-reference)) * var(--status-hue-pull)),
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42
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);
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--info-hue: clamp(
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272,
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calc(288 + (var(--primary-hue) - var(--brand-hue-reference)) * var(--status-hue-pull)),
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302
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);
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/*
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* Expressive (status) colors are deliberately NOT derived from the neutral
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* surface→foreground span the way text and surfaces are. An expressive color
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* has its own identity; tying its lightness to the theme's text ramp is what
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* left warning under-saturated in light mode and too dark in dark mode.
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*
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* Instead each is anchored to a fixed target lightness near its hue's chroma
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* peak and a single shared --expressive-chroma. That chroma is a flat constant,
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* deliberately NOT derived from the neutral --chroma knob: status colors must
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* stay legible even when the brand is dialed toward grayscale. It sits inside
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* sRGB at these lightnesses, so no gamut mapping is required.
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*
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* The dark-mode lightness anchors live here; light mode runs darker (set in
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* light.css) so the fills hold contrast against the near-white surface.
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*/
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--expressive-chroma: 0.14;
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--warning-lightness: 0.8;
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--destructive-lightness: 0.75;
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--info-lightness: 0.7;
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/* shadcn semantic pairs */
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--background: oklch(var(--surface) calc(var(--chroma) * 0.5) var(--surface-hue));
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--foreground-chroma: calc(var(--chroma) * 0.55);
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--foreground: oklch(
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calc(var(--surface) + var(--tone-span) * var(--contrast-text)) var(--foreground-chroma)
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var(--surface-hue)
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);
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/* Inverse of --foreground: canvas-coloured text for use on inverted fills
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(bg-foreground, bg-black / dark:bg-white, etc). Not the same as
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--primary-foreground, which stays dark for the vivid primary fill. */
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--foreground-contrast: oklch(var(--surface) calc(var(--chroma) * 0.55) var(--surface-hue));
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--card: oklch(from var(--background) calc(l + var(--elevation-step) * var(--elevation-1)) c h);
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--card-foreground: var(--foreground);
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--popover: oklch(from var(--background) calc(l + var(--elevation-step) * var(--elevation-2)) c h);
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--popover-foreground: var(--foreground);
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/* Primary is the brand-derived accent: a fixed, vivid Supabase green on
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--primary-hue, mode-invariant and decoupled from the --chroma knob so it
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holds its identity even as neutrals desaturate. NOTE: the `brand` utility
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(--color-brand in theme.css) is deliberately NOT this — it maps to the
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per-theme --brand-default scale (master behavior) while we resolve how
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`brand` is used across the interface. */
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--primary: oklch(0.76 0.15 var(--primary-hue));
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--primary-foreground: oklch(
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min(var(--surface), var(--foreground-lightness)) calc(var(--chroma) * 0.45) var(--primary-hue)
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);
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--secondary: oklch(
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from var(--background) calc(l + var(--elevation-step) * var(--elevation-3)) c h
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);
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--secondary-foreground: var(--foreground);
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--tertiary: oklch(from var(--foreground) l c h / var(--tertiary-alpha));
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--tertiary-foreground-mix: calc(
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var(--tertiary-foreground-level) + (1 - var(--tertiary-foreground-level)) * var(--contrast-up) -
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var(--tertiary-foreground-level) * 0.5 * var(--contrast-down)
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);
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--tertiary-foreground: oklch(
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calc(var(--surface) + var(--tone-span) * var(--tertiary-foreground-mix))
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var(--foreground-chroma) var(--surface-hue)
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);
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--muted: oklch(from var(--foreground) l c h / var(--muted-alpha));
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--muted-foreground-mix: calc(
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var(--muted-foreground-level) + (1 - var(--muted-foreground-level)) * var(--contrast-up) -
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var(--muted-foreground-level) * 0.5 * var(--contrast-down)
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);
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--muted-foreground: oklch(
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calc(var(--surface) + var(--tone-span) * var(--muted-foreground-mix)) var(--foreground-chroma)
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var(--surface-hue)
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);
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--accent: oklch(from var(--foreground) l c h / var(--accent-alpha));
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--accent-foreground: var(--foreground);
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--warning: oklch(var(--warning-lightness) var(--expressive-chroma) var(--warning-hue));
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--destructive: oklch(
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var(--destructive-lightness) var(--expressive-chroma) var(--destructive-hue)
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);
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/*
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* Text that sits on the solid fill: dark ink on light fills (amber), white on
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* dark fills (red). The clamp turns the fill's own lightness into a hard flip
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* around L≈0.62 — (0.62 − l) is negative for light fills (→ floor 0.12) and
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* positive for dark fills (→ ceil 0.99) — so on-colors stay legible and keep
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* flipping correctly if the anchors are retuned. A trace of hue chroma keeps
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* the ink from reading as flat gray.
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*/
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--warning-foreground: oklch(
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from var(--warning) clamp(0.12, calc((0.62 - l) * 100), 0.99) calc(c * 0.08) h
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);
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--destructive-foreground: oklch(
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from var(--destructive) clamp(0.12, calc((0.62 - l) * 100), 0.99) calc(c * 0.08) h
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);
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--info: oklch(var(--info-lightness) var(--expressive-chroma) var(--info-hue));
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--info-foreground: oklch(
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from var(--info) clamp(0.12, calc((0.62 - l) * 100), 0.99) calc(c * 0.08) h
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);
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/* Status border tokens for subtle / tinted surfaces */
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--border-destructive: oklch(from var(--destructive) l c h / 30%);
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--border-warning: oklch(from var(--warning) l c h / 30%);
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--border-info: oklch(from var(--info) l c h / 30%);
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--border-brand: oklch(from var(--primary) l c h / 30%);
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--border: oklch(
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from var(--foreground) l calc(c * 0.54) h / calc(2% + 20% * var(--contrast-border))
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);
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--input: oklch(
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from var(--foreground) l calc(c * 0.5) h / calc(3% + 38% * var(--contrast-border))
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);
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--ring: oklch(from var(--primary) l c h / 55%);
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}
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