/* Design tokens — the only place colors, type and spacing are defined.
   Palette and type follow the sibling course sites (studyMLBasic) so the
   courses look like one series. Change the theme here only. */

:root {
  color-scheme: light;

  /* Surfaces */
  --color-bg: #f4f6f9;
  --color-pane: #ffffff;
  --color-surface: #ffffff;
  --color-surface-2: #f7f9fc;
  --color-border: #e1e6ee;
  --color-border-strong: #c9d1dd;
  --color-text: #1d2433;
  --color-text-muted: #6b7587;

  /* Accents: indigo (primary) + amber (secondary / teacher) */
  --color-accent: #4f46e5;
  --color-accent-hover: #4338ca;
  --color-accent-contrast: #ffffff;
  --color-accent-soft: #eceefe;
  --color-accent2: #a16207;
  --color-accent2-soft: #fef6dc;
  --color-success: #1f7a45;
  --color-success-soft: #e3f6ec;
  --color-warning: #8a5a00;
  --color-warning-soft: #fff6d9;
  --color-danger: #c0392b;
  --color-danger-soft: #fdeaea;
  --color-more: #7b4fd1;
  --color-more-soft: #f1ebfd;
  --color-code-bg: #f6f8fb;
  --color-code-fg: #24292f;
  --color-code-def: #953800;
  --color-focus: #4f46e5;
  --gradient-brand: linear-gradient(135deg, #4f46e5, #f0a04b);
  --gradient-progress: linear-gradient(90deg, #4f46e5, #f5b041);
  --gradient-hero: radial-gradient(circle at 85% 20%, rgb(255 255 255 / 0.18), transparent 40%),
    linear-gradient(135deg, #3f3cbb 0%, #2b5b84 55%, #c48a00 100%);
  --hero-fg: #ffffff;

  /* Terminal (results pane is always dark, in both themes) */
  --term-bg: #0f1419;
  --term-head: #161b22;
  --term-tools: #12171e;
  --term-line: #262c36;
  --term-border: #30363d;
  --term-fg: #d7dde8;
  --term-title: #e6edf3;
  --term-muted: #7d8799;
  --term-err: #ff7b72;
  --term-ok: #4cc983;
  --term-sys: #79c0ff;
  --term-warn: #f2c14e;
  --term-dot-1: #ff5f57;
  --term-dot-2: #febc2e;
  --term-dot-3: #28c840;
  --term-ok-bg: #0f3a22;
  --term-err-bg: #3d1614;
  --term-done-bg: #13283f;

  /* Slides (stage keeps its own palette) */
  --s-bg: #ffffff;
  --s-fg: #1b2230;
  --s-muted: #6a7486;
  --s-line: #e3e8ef;
  --s-card: #f5f7fb;
  --s-accent: #4f46e5;
  --s-accent2: #a16207;
  --s-title-glow: radial-gradient(circle at 88% 12%, rgb(231 111 0 / 0.16), transparent 38%),
    radial-gradient(circle at 10% 95%, rgb(47 111 179 / 0.16), transparent 40%);
  --stage-shadow: 0 10px 40px rgb(15 25 45 / 0.18);
  --fullscreen-bg: #0b0e13;

  /* Whiteboard ink (slides) */
  --ink-1: #e53935;
  --ink-2: #1e63d6;
  --ink-3: #1f9d55;
  --ink-4: #ffb300;
  --ink-5: #1d2433;
  --ink-laser: #ff3b30;

  /* Chunk highlight palette (w04) */
  --chunk-1: #d9dcff;
  --chunk-2: #ffe1c7;
  --chunk-3: #d4f2dc;
  --chunk-4: #f6d6ef;
  --chunk-5: #fff1b8;
  --chunk-6: #d2f0f4;
  --chunk-overlap: #c9b8f5;

  /* Typography */
  --font-sans: "Pretendard Variable", Pretendard, -apple-system, "Segoe UI", "Malgun Gothic", sans-serif;
  --font-mono: "JetBrains Mono", "D2Coding", Consolas, "Courier New", monospace;
  --text-xs: 12px;
  --text-sm: 13.5px;
  --text-md: 15px;
  --text-lg: 16.5px;
  --text-xl: 22px;
  --text-2xl: 30px;
  --text-3xl: 32px;
  --leading-tight: 1.3;
  --leading-body: 1.65;
  --weight-regular: 400;
  --weight-medium: 600;
  --weight-bold: 700;
  --weight-heavy: 800;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --gutter: 16px;

  /* Layout */
  --measure: 72ch;
  --doc-w: 920px;
  --nav-w: 290px;
  --out-w: 430px;
  --topbar-h: 46px;

  /* Shape */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgb(20 30 50 / 0.06), 0 4px 16px rgb(20 30 50 / 0.06);
  --shadow-md: 0 8px 24px rgb(20 30 50 / 0.14);
  --focus-ring: 0 0 0 3px var(--color-focus);

  /* Motion */
  --dur-fast: 120ms;
  --dur-med: 220ms;
}

/* Dark: by OS preference unless the user forced light, or by manual toggle */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --color-bg: #0e1116;
    --color-pane: #151a21;
    --color-surface: #1a2029;
    --color-surface-2: #1f2631;
    --color-border: #2a323e;
    --color-border-strong: #3a4452;
    --color-text: #e3e8f0;
    --color-text-muted: #95a0b2;
    --color-accent: #8b95fa;
    --color-accent-hover: #a5adfb;
    --color-accent-contrast: #10132a;
    --color-accent-soft: #23284a;
    --color-accent2: #f2c14e;
    --color-accent2-soft: #33290f;
    --color-success: #4cc983;
    --color-success-soft: #132e20;
    --color-warning: #f2c14e;
    --color-warning-soft: #33290f;
    --color-danger: #ff7b72;
    --color-danger-soft: #3a1a18;
    --color-more: #b695ff;
    --color-more-soft: #271d3d;
    --color-code-bg: #11161d;
    --color-code-fg: #d6deeb;
    --color-code-def: #ffa657;
    --color-focus: #8b95fa;
    --s-bg: #161b23;
    --s-fg: #e7ecf3;
    --s-muted: #95a0b2;
    --s-line: #2b3340;
    --s-card: #1d2430;
    --s-accent: #8b95fa;
    --s-accent2: #f2c14e;
    --chunk-1: #2c3272;
    --chunk-2: #5a3517;
    --chunk-3: #1d4a2c;
    --chunk-4: #4f2346;
    --chunk-5: #4d4312;
    --chunk-6: #184a52;
    --chunk-overlap: #4a3a86;
    --ink-5: #f2f4f8;
    --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.3), 0 6px 20px rgb(0 0 0 / 0.25);
    --shadow-md: 0 8px 24px rgb(0 0 0 / 0.45);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #0e1116;
  --color-pane: #151a21;
  --color-surface: #1a2029;
  --color-surface-2: #1f2631;
  --color-border: #2a323e;
  --color-border-strong: #3a4452;
  --color-text: #e3e8f0;
  --color-text-muted: #95a0b2;
  --color-accent: #8b95fa;
  --color-accent-hover: #a5adfb;
  --color-accent-contrast: #10132a;
  --color-accent-soft: #23284a;
  --color-accent2: #f2c14e;
  --color-accent2-soft: #33290f;
  --color-success: #4cc983;
  --color-success-soft: #132e20;
  --color-warning: #f2c14e;
  --color-warning-soft: #33290f;
  --color-danger: #ff7b72;
  --color-danger-soft: #3a1a18;
  --color-more: #b695ff;
  --color-more-soft: #271d3d;
  --color-code-bg: #11161d;
  --color-code-fg: #d6deeb;
  --color-code-def: #ffa657;
  --color-focus: #8b95fa;
  --s-bg: #161b23;
  --s-fg: #e7ecf3;
  --s-muted: #95a0b2;
  --s-line: #2b3340;
  --s-card: #1d2430;
  --s-accent: #8b95fa;
  --s-accent2: #f2c14e;
  --chunk-1: #2c3272;
  --chunk-2: #5a3517;
  --chunk-3: #1d4a2c;
  --chunk-4: #4f2346;
  --chunk-5: #4d4312;
  --chunk-6: #184a52;
  --chunk-overlap: #4a3a86;
  --ink-5: #f2f4f8;
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.3), 0 6px 20px rgb(0 0 0 / 0.25);
  --shadow-md: 0 8px 24px rgb(0 0 0 / 0.45);
}