/* ============================================================================
   KEYFRAME / SIGNAL — design tokens
   Philosophy: brutalist-tech precision (Swiss grid discipline, terminal motifs).
   Derived from the Signal video system (src/signal/bits.tsx).
   Deviations from stock brutalism: warm bone ground instead of white; a single
   saturated accent (electric violet); hard OFFSET shadows, never blurred.
   ============================================================================ */

:root {
  /* color — semantic */
  --color-bg-primary: #f2efe7;        /* bone paper */
  --color-bg-secondary: #eae6da;      /* bone, one step down (cards/wells) */
  --color-bg-tertiary: #ffffff;       /* inputs, brightest surface */
  --color-bg-inverse: #16141a;        /* ink panels */

  --color-text-primary: #16141a;      /* ink */
  --color-text-secondary: rgba(22, 20, 26, 0.66);
  --color-text-tertiary: rgba(22, 20, 26, 0.42);
  --color-text-inverse: #f2efe7;
  --color-text-link: #4a22d0;         /* violet darkened for text-size use */

  --color-border-primary: rgba(22, 20, 26, 0.18);
  --color-border-secondary: rgba(22, 20, 26, 0.09);
  --color-border-focus: #5b2eff;

  --color-accent-primary: #5b2eff;    /* electric violet */
  --color-accent-primary-hover: #4a22d0;
  --color-accent-primary-active: #3d1cae;
  --color-accent-on-primary: #ffffff; /* text on violet — always white */
  --color-accent-secondary: #16141a;  /* ink blocks as secondary action */

  --color-status-success: #1e7d4e;
  --color-status-warning: #a86a00;
  --color-status-error: #c2372a;
  --color-status-info: #4a22d0;

  --color-surface-overlay: rgba(22, 20, 26, 0.72);
  --color-grid-line: rgba(22, 20, 26, 0.06); /* the tick grid */

  /* type */
  --font-family-display: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --font-family-wordmark: "Unbounded", "Space Grotesk", sans-serif;
  --font-family-body: "Inter", -apple-system, "Segoe UI", sans-serif;
  --font-family-mono: "Space Grotesk", ui-monospace, "SF Mono", monospace;

  --font-size-xs: 0.75rem;    /* 12 — status bars, fine print */
  --font-size-sm: 0.875rem;   /* 14 */
  --font-size-base: 1.0625rem;/* 17 — body */
  --font-size-md: 1.25rem;    /* 20 */
  --font-size-lg: 1.5rem;     /* 24 */
  --font-size-xl: 2rem;       /* 32 */
  --font-size-2xl: 2.75rem;   /* 44 */
  --font-size-3xl: 3.75rem;   /* 60 */
  --font-size-4xl: clamp(2.75rem, 7vw, 5.25rem); /* hero */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.06;
  --line-height-snug: 1.25;
  --line-height-normal: 1.55;
  --line-height-relaxed: 1.7;

  --letter-spacing-tight: -0.02em;    /* display */
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.14em;      /* status bars, eyebrows, chips */

  /* spacing — 4px base, Swiss discipline */
  --space-0: 0;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;
  --space-11: 192px;
  --space-12: 256px;

  /* layout */
  --max-width-content: 68ch;
  --max-width-wide: 1080px;
  --max-width-page: 1280px;

  /* radius — Signal is square. Radius is an exception, not a default. */
  --border-radius-sm: 0;
  --border-radius-md: 0;
  --border-radius-lg: 2px;
  --border-radius-full: 999px;        /* pin dots only */

  /* shadows — hard offsets, never blur (the VioletBlock rule) */
  --shadow-sm: 4px 4px 0 rgba(22, 20, 26, 0.92);
  --shadow-md: 8px 8px 0 rgba(22, 20, 26, 0.92);
  --shadow-lg: 14px 14px 0 rgba(22, 20, 26, 0.92);
  --shadow-violet: 8px 8px 0 rgba(91, 46, 255, 0.9);
  --shadow-focus: 0 0 0 3px rgba(91, 46, 255, 0.35);

  /* motion */
  --duration-instant: 50ms;
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --duration-slower: 600ms;
  --easing-default: cubic-bezier(0.4, 0, 0.2, 1);
  --easing-in: cubic-bezier(0.4, 0, 1, 1);
  --easing-out: cubic-bezier(0, 0, 0.2, 1);
  --easing-snap: cubic-bezier(0.34, 1.56, 0.64, 1); /* block snaps */
}

/* dark — the ink terminal. Not an inversion: violet brightens, shadows go violet. */
[data-theme="dark"] {
  --color-bg-primary: #16141a;
  --color-bg-secondary: #1e1b22;
  --color-bg-tertiary: #26232c;
  --color-bg-inverse: #f2efe7;

  --color-text-primary: #edeae1;
  --color-text-secondary: rgba(237, 234, 225, 0.68);
  --color-text-tertiary: rgba(237, 234, 225, 0.42);
  --color-text-inverse: #16141a;
  --color-text-link: #9d7dff;

  --color-border-primary: rgba(237, 234, 225, 0.2);
  --color-border-secondary: rgba(237, 234, 225, 0.1);

  --color-accent-primary: #6d43ff;
  --color-accent-primary-hover: #7f5bff;
  --color-accent-primary-active: #5b2eff;

  --color-surface-overlay: rgba(0, 0, 0, 0.78);
  --color-grid-line: rgba(237, 234, 225, 0.06);

  --shadow-sm: 4px 4px 0 rgba(0, 0, 0, 0.85);
  --shadow-md: 8px 8px 0 rgba(0, 0, 0, 0.85);
  --shadow-lg: 14px 14px 0 rgba(0, 0, 0, 0.85);
  --shadow-violet: 8px 8px 0 rgba(109, 67, 255, 0.85);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg-primary: #16141a;
    --color-bg-secondary: #1e1b22;
    --color-bg-tertiary: #26232c;
    --color-bg-inverse: #f2efe7;
    --color-text-primary: #edeae1;
    --color-text-secondary: rgba(237, 234, 225, 0.68);
    --color-text-tertiary: rgba(237, 234, 225, 0.42);
    --color-text-inverse: #16141a;
    --color-text-link: #9d7dff;
    --color-border-primary: rgba(237, 234, 225, 0.2);
    --color-border-secondary: rgba(237, 234, 225, 0.1);
    --color-accent-primary: #6d43ff;
    --color-accent-primary-hover: #7f5bff;
    --color-accent-primary-active: #5b2eff;
    --color-surface-overlay: rgba(0, 0, 0, 0.78);
    --color-grid-line: rgba(237, 234, 225, 0.06);
    --shadow-sm: 4px 4px 0 rgba(0, 0, 0, 0.85);
    --shadow-md: 8px 8px 0 rgba(0, 0, 0, 0.85);
    --shadow-lg: 14px 14px 0 rgba(0, 0, 0, 0.85);
    --shadow-violet: 8px 8px 0 rgba(109, 67, 255, 0.85);
  }
}