/* SPDX-License-Identifier: MIT OR Apache-2.0
   flowRS's design tokens: flowRS's own work, under MIT OR Apache-2.0 (at your option), the licence
   of the runtime crates. Every exported app ships a copy (ui/tokens.css); the root NOTICE says so. */
/* ============================================================================
   flowRS design tokens: one schema (--fr-*), two skins.

   This is the ONLY file in the front-end that may spell a colour as a hex literal
   (crates/flowrs-ui/js-test/tokens.test.mjs fails on one anywhere else). Everything
   else reads a token: CSS through var(--fr-…), the canvases through crate::kit::tokens,
   which reads this file at compile time.

   Skins override values only, never names. `Instrument` (dark) is the IDE's look and the
   default; `Paper` (light) is the OpenUI-grade app skin: grey surfaces, one accent, 16 px
   card corners, 24 px gaps, faint borders, 90–200 ms ease-out motion. A skin applies to
   the element that carries `data-skin` and everything inside it, so a page can show both.

   Every pair a reader depends on is measured, after alpha blending, by the tests:
   text ≥ 4.5:1 on every surface it sits on (WCAG 1.4.3), marks and control edges ≥ 3:1
   (1.4.11), the focus ring ≥ 3:1, and the state colours and the held wire ≥ ΔE 6 apart
   for normal, protan and deutan vision (flowrs-critic's tokens test, flowrs-viz's metric).
   Chart palettes are dpb-plot's validated slots and blue ramp (crates/dpb-plot/src/colour.rs).

   Three layers:
     1. the Instrument values (the default, and any [data-skin="instrument"] subtree);
     2. the Paper values;
     3. tokens derived from those, and the legacy names main.css and views.css were written
        against. They are declared on every skin root so they resolve inside that skin:
        a custom property's var() is resolved where it is declared, then inherited.
   ============================================================================ */

/* 1. Instrument (dark) ------------------------------------------------------ */
:root,
[data-skin="instrument"] {
  color-scheme: dark;

  /* Surfaces: elevation by lightness, with a faint blue bias */
  --fr-bg: #090c12; /* the page */
  --fr-surface-1: #0f131c; /* rails, panels */
  --fr-surface-2: #161c28; /* cards, controls */
  --fr-surface-3: #1f2836; /* raised, selected */
  --fr-surface-sunk: #0b0f16; /* wells: inputs, code, readouts */
  --fr-hi: rgba(255, 255, 255, 0.05); /* a card's inner top-highlight */

  /* Ink layers: one ink at an alpha, so a layer stacks on any surface */
  --fr-layer-hover: rgba(238, 242, 248, 0.05);
  --fr-layer-pressed: rgba(238, 242, 248, 0.09);
  --fr-layer-track: rgba(238, 242, 248, 0.08);
  --fr-overlay: rgba(4, 7, 12, 0.62);

  /* Hairlines */
  --fr-border: #222b3a;
  --fr-border-2: #2c3849;
  --fr-border-3: #3a4658;
  --fr-border-control: #67758a; /* an input's edge: 3:1 on every surface */

  /* Text (4.5:1 or better on every surface and on a hovered one) */
  --fr-text: #eef2f8;
  --fr-text-soft: #d3dbe6;
  --fr-text-2: #a9b4c6;
  --fr-text-3: #8e9aad; /* muted: was #6a7688, 3.22:1 on surface-3; now 5.21:1 */
  --fr-text-disabled: rgba(238, 242, 248, 0.38);
  --fr-console-text: #b6f0c9;

  /* Brand: the cyan-to-emerald flow; the accent is the signature teal */
  --fr-accent: #35e0c4;
  --fr-accent-2: #46a6ff;
  --fr-accent-ink: #04140f; /* text on the accent */
  --fr-accent-text: #35e0c4; /* the accent as text on a surface */
  --fr-accent-soft: rgba(53, 224, 196, 0.12);
  --fr-accent-glow: rgba(53, 224, 196, 0.35);
  --fr-focus: #35e0c4;
  --fr-focus-glow: rgba(53, 224, 196, 0.22);
  --fr-white: #ffffff;

  /* State: reserved for meaning, never a series. Each has a mark, a text and a soft tint. */
  --fr-good: #4ade80; /* was #34d399, ΔE 5.8 from the accent for deutan vision; now 8.3 */
  --fr-warn: #f4b740;
  --fr-crit: #ff5d6c;
  --fr-info: #46a6ff;
  --fr-good-text: #6fe39a;
  --fr-warn-text: #f7c75f;
  --fr-crit-text: #ff8a95;
  --fr-info-text: #8ec2ff;
  --fr-good-soft: rgba(74, 222, 128, 0.14);
  --fr-warn-soft: rgba(244, 183, 64, 0.14);
  --fr-crit-soft: rgba(255, 93, 108, 0.14);
  --fr-info-soft: rgba(70, 166, 255, 0.14);

  /* A held wire carries the previous step. Lavender, lighter than every ownership
     colour: was #c084fc, ΔE 2.6 from the borrow blue for deutan vision; now 8.2 (protan)
     from --fr-accent-2 and 10.4 from the borrow wire. */
  --fr-held: #d8b4fe;

  /* Wires by ownership mode (the canvas) */
  --fr-wire-move: #ff9f4a;
  --fr-wire-borrow: #4a9eff;
  --fr-wire-borrow-mut: #ff5252;
  --fr-wire-clone: #4ade80;
  --fr-wire-copy: #9aa4b2;

  /* Chart: one hue for one series, dpb-plot's dark slots for categories (at most six,
     the rest fold into "other"), its blue ramp with the anchor flipped so low values
     recede into the dark surface. */
  --fr-cat-1: #3987e5;
  --fr-cat-2: #d95926;
  --fr-cat-3: #199e70;
  --fr-cat-4: #c98500;
  --fr-cat-5: #d55181;
  --fr-cat-6: #008300;
  --fr-cat-other: #898781;
  --fr-seq-1: #0d366b;
  --fr-seq-2: #104281;
  --fr-seq-3: #1c5cab;
  --fr-seq-4: #2a78d6;
  --fr-seq-5: #3987e5;
  --fr-seq-6: #6da7ec;
  --fr-seq-7: #9ec5f4;
  --fr-seq-8: #b7d3f6;
  --fr-seq-9: #cde2fb;
  --fr-chart-grid: rgba(238, 242, 248, 0.07);
  --fr-chart-axis: #3a4658;

  /* Instruments */
  --fr-track: #2b3440; /* a gauge's or bar's empty track */
  --fr-needle: #e6edf3;
  --fr-knob-hi: #2b3646;
  --fr-knob-lo: #10151e;
  --fr-led-off: #232b37;

  /* Layout */
  --fr-radius-card: 14px;
  --fr-pad-card: 16px;
  --fr-gap-card: 16px;
  --fr-gap-stack: 12px;

  /* Elevation */
  --fr-shadow-1: 0 1px 2px rgba(0, 0, 0, 0.5);
  --fr-shadow-2: 0 6px 18px rgba(0, 0, 0, 0.4);
  --fr-shadow-3: 0 24px 60px rgba(0, 0, 0, 0.55);
  --fr-shadow-card: 0 6px 18px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.05);

  /* The one main action: the flow gradient */
  --fr-primary-fill: linear-gradient(120deg, #46a6ff 0%, #35e0c4 100%);

  /* Named colours a person's graph may ask for (a game sprite's "green") */
  --fr-swatch-red: #ef4444;
  --fr-swatch-green: #22c55e;
  --fr-swatch-blue: #3b82f6;
  --fr-swatch-yellow: #eab308;
  --fr-swatch-orange: #f97316;
  --fr-swatch-purple: #a855f7;
  --fr-swatch-pink: #ec4899;
  --fr-swatch-white: #f8fafc;
  --fr-swatch-cyan: #38bdf8;
  --fr-swatch-lime: #84cc16;
  --fr-swatch-gold: #f59e0b;
  --fr-swatch-gray: #9ca3af;

  /* The block diagram's node families (the AST bridge's rir.* constructs) */
  --fr-node-structure: #64748b;
  --fr-node-item: #8b5cf6;
  --fr-node-block: #334155;
  --fr-node-binding: #0ea5e9;
  --fr-node-control: #f59e0b;
  --fr-node-call: #10b981;
  --fr-node-closure: #ec4899;
  --fr-node-operator: #3b82f6;
  --fr-node-data: #14b8a6;
  --fr-node-jump: #ef4444;
  --fr-node-leaf: #4b5563;
  --fr-node-unknown: #3a4048;

  /* The status bar's dot */
  --fr-status-idle: #8a8a8a;
  --fr-status-busy: #ffb74a;
}

/* 2. Paper (light) ---------------------------------------------------------- */
[data-skin="paper"] {
  color-scheme: light;

  /* Surfaces: grey page, white cards (cards rise by being lighter) */
  --fr-bg: #f3f4f6;
  --fr-surface-1: #f9fafb;
  --fr-surface-2: #ffffff;
  --fr-surface-3: #eceef1;
  --fr-surface-sunk: #f3f4f6;
  --fr-hi: rgba(255, 255, 255, 0);

  --fr-layer-hover: rgba(20, 23, 28, 0.04);
  --fr-layer-pressed: rgba(20, 23, 28, 0.08);
  --fr-layer-track: rgba(20, 23, 28, 0.07);
  --fr-overlay: rgba(20, 23, 28, 0.4);

  /* Faint hairlines: felt rather than seen */
  --fr-border: rgba(20, 23, 28, 0.08);
  --fr-border-2: rgba(20, 23, 28, 0.12);
  --fr-border-3: rgba(20, 23, 28, 0.2);
  --fr-border-control: #7a818c;

  --fr-text: #14171c;
  --fr-text-soft: #2b313b;
  --fr-text-2: #454d5a;
  --fr-text-3: #5b6370;
  --fr-text-disabled: rgba(20, 23, 28, 0.38);
  --fr-console-text: #14532d;

  /* One accent: the brand teal, deepened to read on white */
  --fr-accent: #0b7a69;
  --fr-accent-2: #2563c9;
  --fr-accent-ink: #ffffff;
  --fr-accent-text: #08695a;
  --fr-accent-soft: rgba(11, 122, 105, 0.1);
  --fr-accent-glow: rgba(11, 122, 105, 0.18);
  --fr-focus: #0b7a69;
  --fr-focus-glow: rgba(11, 122, 105, 0.16);

  /* State, spread in lightness so they stay apart for protan and deutan vision */
  --fr-good: #0f6a31;
  --fr-warn: #c16e2d;
  --fr-crit: #bb0916;
  --fr-info: #2563c9;
  --fr-good-text: #0f6a31;
  --fr-warn-text: #8a4a12;
  --fr-crit-text: #a8121c;
  --fr-info-text: #1d55ad;
  --fr-good-soft: rgba(15, 106, 49, 0.1);
  --fr-warn-soft: rgba(193, 110, 45, 0.12);
  --fr-crit-soft: rgba(187, 9, 22, 0.08);
  --fr-info-soft: rgba(37, 99, 201, 0.1);
  --fr-held: #45257d;

  --fr-wire-move: #b45309;
  --fr-wire-borrow: #2563c9;
  --fr-wire-borrow-mut: #bb0916;
  --fr-wire-clone: #0f6a31;
  --fr-wire-copy: #5b6370;

  /* dpb-plot's light slots (each 3:1 on the card) and its blue ramp, low = light */
  --fr-cat-1: #2a78d6;
  --fr-cat-2: #e96632;
  --fr-cat-3: #0ba370;
  --fr-cat-4: #bd7f03;
  --fr-cat-5: #d76c95;
  --fr-cat-6: #008300;
  --fr-cat-other: #898781;
  --fr-seq-1: #cde2fb;
  --fr-seq-2: #b7d3f6;
  --fr-seq-3: #9ec5f4;
  --fr-seq-4: #6da7ec;
  --fr-seq-5: #3987e5;
  --fr-seq-6: #2a78d6;
  --fr-seq-7: #1c5cab;
  --fr-seq-8: #104281;
  --fr-seq-9: #0d366b;
  --fr-chart-grid: rgba(20, 23, 28, 0.07);
  --fr-chart-axis: rgba(20, 23, 28, 0.2);

  --fr-track: #e3e6ea;
  --fr-needle: #14171c;
  --fr-knob-hi: #ffffff;
  --fr-knob-lo: #dfe3e8;
  --fr-led-off: #d5d9df;

  --fr-radius-card: 16px;
  --fr-pad-card: 20px;
  --fr-gap-card: 24px;
  --fr-gap-stack: 16px;

  /* Two layers, negative spread, low alpha: soft lift, not an outline */
  --fr-shadow-1: 0 1px 3px -2px rgba(0, 0, 0, 0.06), 0 2px 5px -2px rgba(0, 0, 0, 0.06);
  --fr-shadow-2: 0 4px 8px -4px rgba(0, 0, 0, 0.08), 0 12px 24px -8px rgba(0, 0, 0, 0.08);
  --fr-shadow-3: 0 16px 32px -8px rgba(0, 0, 0, 0.16), 0 32px 64px -12px rgba(0, 0, 0, 0.22);
  /* A card is its fill and a faint border; no shadow on top of both (P16). */
  --fr-shadow-card: none;

  /* One accent, solid */
  --fr-primary-fill: #0b7a69;
}

/* 3. Derived tokens and legacy names, resolved under each skin -------------- */
:root,
[data-skin] {
  /* Brand gradient and focus */
  --fr-flow: linear-gradient(120deg, var(--fr-accent-2) 0%, var(--fr-accent) 100%);
  --fr-ring: 0 0 0 2px var(--fr-focus), 0 0 0 5px var(--fr-focus-glow);
  --fr-wire-held: var(--fr-held);
  --fr-status-ready: var(--fr-good);
  --fr-status-error: var(--fr-crit);

  /* Type: Geist and Geist Mono (styles/fonts.css). Ramp 12/14/16/18/24/28/32. */
  --fr-font-ui: "Geist", ui-sans-serif, -apple-system, system-ui, "Segoe UI", sans-serif;
  --fr-font-mono: "Geist Mono", ui-monospace, "SF Mono", "JetBrains Mono", monospace;
  --fr-fs-xs: 12px;
  --fr-fs-sm: 14px;
  --fr-fs-md: 16px;
  --fr-fs-lg: 18px;
  --fr-fs-xl: 24px;
  --fr-fs-2xl: 28px;
  --fr-fs-3xl: 32px;
  --fr-fw-regular: 400;
  --fr-fw-medium: 500;
  --fr-fw-strong: 600;
  --fr-lh-body: 1.5;
  --fr-lh-heading: 1.25;
  --fr-lh-display: 1.1;
  --fr-tracking: -0.01em;
  --fr-tracking-display: -0.02em;
  --fr-tracking-caps: 0.04em;

  /* Space: a 4 px grid */
  --fr-space-0: 0px;
  --fr-space-half: 2px;
  --fr-space-1: 4px;
  --fr-space-2: 8px;
  --fr-space-3: 12px;
  --fr-space-4: 16px;
  --fr-space-5: 20px;
  --fr-space-6: 24px;
  --fr-space-8: 32px;
  --fr-space-10: 40px;
  --fr-space-12: 48px;

  /* Radius: three on a screen (card, control, pill) */
  --fr-radius-control: 10px;
  --fr-radius-full: 999px;
  --fr-radius-mark: 3px;

  /* Motion: 90 ms press, 120–160 ms fades, 200 ms moves, 300 ms panels; ease-out in,
     ease-in out. Zero under prefers-reduced-motion (below). */
  --fr-dur-press: 90ms;
  --fr-dur-fast: 120ms;
  --fr-dur-base: 160ms;
  --fr-dur-slow: 200ms;
  --fr-dur-panel: 300ms;
  --fr-ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --fr-ease-in: cubic-bezier(0.4, 0, 1, 1);
  --fr-ease-standard: cubic-bezier(0.2, 0.7, 0.2, 1);

  /* Legacy names: main.css and views.css were written against these */
  --bg: var(--fr-bg);
  --panel: var(--fr-surface-1);
  --panel-2: var(--fr-surface-2);
  --panel-3: var(--fr-surface-3);
  --hi: var(--fr-hi);
  --border: var(--fr-border);
  --border-2: var(--fr-border-2);
  --text: var(--fr-text);
  --text-2: var(--fr-text-2);
  --muted: var(--fr-text-3);
  --accent: var(--fr-accent);
  --accent-2: var(--fr-accent-2);
  --accent-ink: var(--fr-accent-ink);
  --accent-glow: var(--fr-accent-glow);
  --flow: var(--fr-flow);
  --good: var(--fr-good);
  --warn: var(--fr-warn);
  --crit: var(--fr-crit);
  --held: var(--fr-held);
  --origin-human: var(--fr-accent);
  --origin-agent: var(--fr-accent-2);
  --origin-mixed: var(--fr-warn);
  --origin-imported: var(--fr-text-2);
  --origin-unknown: var(--fr-text-3);
  --r-sm: 7px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-xl: 20px;
  --sh-1: var(--fr-shadow-1);
  --sh-2: var(--fr-shadow-2);
  --sh-3: var(--fr-shadow-3);
  --ring: var(--fr-ring);
  --ease: var(--fr-ease-standard);
  --fast: var(--fr-dur-fast) var(--fr-ease-standard);
  --med: var(--fr-dur-slow) var(--fr-ease-standard);
  --font-ui: var(--fr-font-ui);
  --font-mono: var(--fr-font-mono);
}

/* Reduced motion: every duration token goes to zero, and anything that still animates
   (a transition or keyframe written with a literal time) is cut to a single frame. */
@media (prefers-reduced-motion: reduce) {
  :root,
  [data-skin] {
    --fr-dur-press: 0ms;
    --fr-dur-fast: 0ms;
    --fr-dur-base: 0ms;
    --fr-dur-slow: 0ms;
    --fr-dur-panel: 0ms;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}