/* Design tokens — single source of truth for color, type, space, motion. */
:root,
[data-theme="dark"] {
  --color-bg: #050816;
  --color-bg-secondary: #0b1023;
  --color-surface: rgba(255, 255, 255, 0.04);
  --color-surface-hover: rgba(255, 255, 255, 0.07);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.16);

  --color-text: #f4f6fb;
  --color-text-secondary: rgba(244, 246, 251, 0.68);
  --color-text-muted: rgba(244, 246, 251, 0.44);

  --color-accent: #4f8cff;
  --color-accent-purple: #7b61ff;
  --color-accent-cyan: #00d4ff;
  --color-success: #3ddc97;

  --shadow-color: 220 60% 2%;
  --shadow-sm: 0 1px 2px hsl(var(--shadow-color) / 0.4);
  --shadow-md: 0 8px 24px -8px hsl(var(--shadow-color) / 0.55);
  --shadow-lg: 0 24px 48px -12px hsl(var(--shadow-color) / 0.65);
  --shadow-glow: 0 0 32px -4px rgba(79, 140, 255, 0.35);

  --scrim: rgba(2, 4, 12, 0.6);
}

[data-theme="light"] {
  --color-bg: #f6f8fc;
  --color-bg-secondary: #ffffff;
  --color-surface: rgba(11, 16, 35, 0.035);
  --color-surface-hover: rgba(11, 16, 35, 0.06);
  --color-border: rgba(11, 16, 35, 0.08);
  --color-border-strong: rgba(11, 16, 35, 0.16);

  --color-text: #0b1023;
  --color-text-secondary: rgba(11, 16, 35, 0.68);
  --color-text-muted: rgba(11, 16, 35, 0.48);

  --color-accent: #3d6fe0;
  --color-accent-purple: #6a4ee0;
  --color-accent-cyan: #0098b8;
  --color-success: #1f9e6f;

  --shadow-color: 220 40% 60%;
  --shadow-sm: 0 1px 2px hsl(var(--shadow-color) / 0.12);
  --shadow-md: 0 8px 24px -8px hsl(var(--shadow-color) / 0.2);
  --shadow-lg: 0 24px 48px -12px hsl(var(--shadow-color) / 0.25);
  --shadow-glow: 0 0 32px -4px rgba(61, 111, 224, 0.25);

  --scrim: rgba(11, 16, 35, 0.4);
}

:root {
  --gradient-primary: linear-gradient(
    135deg,
    var(--color-accent),
    var(--color-accent-purple)
  );
  --gradient-cyan: linear-gradient(
    135deg,
    var(--color-accent-cyan),
    var(--color-accent)
  );
  --gradient-mesh: radial-gradient(
      40% 40% at 20% 20%,
      rgba(79, 140, 255, 0.35),
      transparent 70%
    ),
    radial-gradient(35% 35% at 80% 15%, rgba(123, 97, 255, 0.3), transparent 70%),
    radial-gradient(45% 45% at 50% 90%, rgba(0, 212, 255, 0.18), transparent 70%);

  /* Type */
  --font-display: "Sora", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;

  --text-xs: clamp(0.75rem, 0.72rem + 0.1vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.85rem + 0.1vw, 0.9375rem);
  --text-base: clamp(1rem, 0.97rem + 0.15vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.08rem + 0.2vw, 1.25rem);
  --text-xl: clamp(1.375rem, 1.3rem + 0.35vw, 1.625rem);
  --text-2xl: clamp(1.75rem, 1.6rem + 0.7vw, 2.25rem);
  --text-3xl: clamp(2.25rem, 1.95rem + 1.4vw, 3.25rem);
  --text-hero: clamp(2.75rem, 2.1rem + 3vw, 5.25rem);

  --leading-tight: 1.1;
  --leading-snug: 1.3;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* Space (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;

  /* Radius */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 999px;

  /* Motion */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-base: 300ms;
  --duration-slow: 600ms;

  /* Layout */
  --container-width: 1180px;
  --nav-height: 76px;

  /* Z-index scale */
  --z-nav: 100;
  --z-palette: 200;
  --z-toast: 300;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --duration-fast: 0.01ms;
    --duration-base: 0.01ms;
    --duration-slow: 0.01ms;
  }
}