/* ============================================================
   GradSpark — Design Tokens (Stage 1)
   Source of truth: design-tokens/tokens.json
   Two themes: default (light) and [data-theme="dark"]
   Never hard-code values in component CSS — use these vars.
   ============================================================ */

:root {
  /* ---------- Color · Primitives ---------- */
  --color-blue-50:  #EFF6FF;
  --color-blue-100: #DBEAFE;
  --color-blue-200: #BFDBFE;
  --color-blue-300: #93C5FD;
  --color-blue-400: #60A5FA;
  --color-blue-500: #2563EB;
  --color-blue-600: #1D4ED8;
  --color-blue-700: #1E40AF;
  --color-blue-800: #1E3A8A;
  --color-blue-900: #172554;

  --color-green-50:  #ECFDF5;
  --color-green-100: #D1FAE5;
  --color-green-200: #A7F3D0;
  --color-green-300: #6EE7B7;
  --color-green-400: #34D399;
  --color-green-500: #10B981;
  --color-green-600: #059669;
  --color-green-700: #047857;
  --color-green-800: #065F46;
  --color-green-900: #064E3B;

  --color-red-50:  #FEF2F2;
  --color-red-100: #FEE2E2;
  --color-red-300: #FCA5A5;
  --color-red-500: #EF4444;
  --color-red-600: #DC2626;
  --color-red-700: #B91C1C;
  --color-red-900: #7F1D1D;

  --color-amber-100: #FEF3C7;
  --color-amber-300: #FCD34D;
  --color-amber-500: #F59E0B;
  --color-amber-700: #B45309;

  --color-neutral-0:    #FFFFFF;
  --color-neutral-50:   #F9FAFB;
  --color-neutral-100:  #F3F4F6;
  --color-neutral-200:  #E5E7EB;
  --color-neutral-300:  #D1D5DB;
  --color-neutral-400:  #9CA3AF;
  --color-neutral-500:  #6B7280;
  --color-neutral-600:  #4B5563;
  --color-neutral-700:  #374151;
  --color-neutral-800:  #1F2937;
  --color-neutral-900:  #111827;
  --color-neutral-1000: #000000;

  /* ---------- Color · Semantic (Light) ---------- */
  --bg-canvas:         var(--color-neutral-100);
  --bg-surface:        var(--color-neutral-0);
  --bg-surface-raised: var(--color-neutral-0);
  --bg-muted:          var(--color-neutral-100);
  --bg-inverse:        var(--color-neutral-900);

  --text-primary:   var(--color-neutral-800);
  --text-secondary: var(--color-neutral-600);
  --text-tertiary:  var(--color-neutral-500);
  --text-inverse:   var(--color-neutral-0);
  --text-disabled:  var(--color-neutral-400);
  --text-link:      var(--color-blue-500);

  --border-default: var(--color-neutral-200);
  --border-strong:  var(--color-neutral-300);
  --border-focus:   var(--color-blue-500);
  --border-danger:  var(--color-red-500);

  /* ---------- Action ---------- */
  --action-primary-default:     var(--color-blue-500);
  --action-primary-hover:       var(--color-blue-600);
  --action-primary-active:      var(--color-blue-700);
  --action-primary-disabled-bg: var(--color-neutral-200);
  --action-primary-disabled-fg: var(--color-neutral-400);
  --action-primary-fg:          var(--color-neutral-0);

  --action-secondary-default: var(--color-green-500);
  --action-secondary-hover:   var(--color-green-600);
  --action-secondary-active:  var(--color-green-700);
  --action-secondary-fg:      var(--color-neutral-0);

  --action-danger-default: var(--color-red-500);
  --action-danger-hover:   var(--color-red-600);
  --action-danger-active:  var(--color-red-700);
  --action-danger-fg:      var(--color-neutral-0);

  --action-outline-border:   var(--color-neutral-300);
  --action-outline-hover-bg: var(--color-neutral-100);
  --action-ghost-hover-bg:   var(--color-neutral-100);

  /* ---------- Status ---------- */
  --status-success-bg:     var(--color-green-100);
  --status-success-fg:     var(--color-green-700);
  --status-success-border: var(--color-green-300);

  --status-warning-bg:     var(--color-amber-100);
  --status-warning-fg:     var(--color-amber-700);
  --status-warning-border: var(--color-amber-300);

  --status-danger-bg:     var(--color-red-100);
  --status-danger-fg:     var(--color-red-700);
  --status-danger-border: var(--color-red-300);

  --status-info-bg:     var(--color-blue-100);
  --status-info-fg:     var(--color-blue-700);
  --status-info-border: var(--color-blue-300);

  /* ---------- Spacing (4px grid) ---------- */
  --space-0:   0px;
  --space-0_5: 2px;
  --space-1:   4px;
  --space-2:   8px;
  --space-3:   12px;
  --space-4:   16px;
  --space-5:   20px;
  --space-6:   24px;
  --space-7:   28px;
  --space-8:   32px;
  --space-10:  40px;
  --space-12:  48px;
  --space-14:  56px;
  --space-16:  64px;
  --space-20:  80px;
  --space-24:  96px;
  --space-32:  128px;

  /* ---------- Radius ---------- */
  --radius-none: 0px;
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  24px;
  --radius-pill: 9999px;

  /* ---------- Typography ---------- */
  --font-sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", SFMono-Regular, Consolas, monospace;

  --fw-regular:  400;
  --fw-medium:   500;
  --fw-semibold: 600;
  --fw-bold:     700;

  /* ---------- Elevation ---------- */
  --shadow-1: 0 1px 2px rgba(17,24,39,0.06), 0 1px 1px rgba(17,24,39,0.04);
  --shadow-2: 0 4px 8px rgba(17,24,39,0.08), 0 1px 2px rgba(17,24,39,0.04);
  --shadow-3: 0 8px 16px rgba(17,24,39,0.10), 0 2px 4px rgba(17,24,39,0.06);
  --shadow-4: 0 16px 32px rgba(17,24,39,0.14), 0 4px 8px rgba(17,24,39,0.08);
  --shadow-focus: 0 0 0 4px rgba(37, 99, 235, 0.20);

  /* ---------- Layout ---------- */
  --bp-mobile:  375px;
  --bp-tablet:  768px;
  --bp-laptop:  1024px;
  --bp-desktop: 1280px;
  --bp-wide:    1440px;

  --container-max: 1280px;
  --container-pad: var(--space-20);

  /* ---------- Motion ---------- */
  --duration-1: 80ms;
  --duration-2: 120ms;
  --duration-3: 160ms;
  --duration-4: 220ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   Dark theme — only the semantic / action layer flips.
   Primitives stay constant; everything else aliases through.
   ============================================================ */
[data-theme="dark"] {
  --bg-canvas:         var(--color-neutral-900);
  --bg-surface:        var(--color-neutral-800);
  --bg-surface-raised: var(--color-neutral-700);
  --bg-muted:          var(--color-neutral-800);
  --bg-inverse:        var(--color-neutral-0);

  --text-primary:   var(--color-neutral-50);
  --text-secondary: var(--color-neutral-300);
  --text-tertiary:  var(--color-neutral-400);
  --text-inverse:   var(--color-neutral-900);
  --text-disabled:  var(--color-neutral-500);
  --text-link:      var(--color-blue-400);

  --border-default: var(--color-neutral-700);
  --border-strong:  var(--color-neutral-600);
  --border-focus:   var(--color-blue-400);

  --action-primary-hover:       var(--color-blue-400);
  --action-primary-active:      var(--color-blue-300);
  --action-primary-disabled-bg: var(--color-neutral-700);
  --action-primary-disabled-fg: var(--color-neutral-500);

  --action-secondary-hover: var(--color-green-400);
  --action-secondary-active: var(--color-green-300);

  --action-danger-hover: var(--color-red-600);
  --action-danger-active: var(--color-red-700);

  --action-outline-border:   var(--color-neutral-600);
  --action-outline-hover-bg: var(--color-neutral-700);
  --action-ghost-hover-bg:   var(--color-neutral-700);

  --shadow-1: 0 1px 2px rgba(0,0,0,0.40);
  --shadow-2: 0 4px 8px rgba(0,0,0,0.45);
  --shadow-3: 0 8px 16px rgba(0,0,0,0.50);
  --shadow-4: 0 16px 32px rgba(0,0,0,0.55);
  --shadow-focus: 0 0 0 4px rgba(96, 165, 250, 0.30);

  /* Status tint backgrounds — light-mode pastels (#D1FAE5 etc.) blow out
     the dark canvas. Flip to translucent vibrant so the matching `*-700`
     text on top stays readable through the alpha blend. The mid/strong
     tones (`*-500`, `*-700`) are kept as-is so badge fills and text
     colours don't shift. */
  --color-green-50:  rgba(16, 185, 129, 0.10);
  --color-green-100: rgba(16, 185, 129, 0.18);
  --color-amber-50:  rgba(245, 158, 11, 0.10);
  --color-amber-100: rgba(245, 158, 11, 0.20);
  --color-red-50:    rgba(239, 68, 68, 0.10);
  --color-red-100:   rgba(239, 68, 68, 0.18);
  --color-blue-50:   rgba(37, 99, 235, 0.10);
  --color-blue-100:  rgba(37, 99, 235, 0.18);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}