/* ============================================================
   FengYao Design Tokens — official brand book v1.0
   Royal Blue primary · Azure→Deep Blue gradient · Cyan Spark accent
   Navy text · Midnight dark surface · Inter / Noto Sans typography
   ============================================================ */

:root,
[data-theme='light'] {
  /* Surfaces — cool, clean */
  --color-bg: #f6f8fc;
  --color-surface: #ffffff;
  --color-surface-2: #fbfcfe;
  --color-surface-offset: #eef2fa;
  --color-surface-offset-2: #e4ebf6;
  --color-surface-dynamic: #d8e0f0;
  --color-divider: #e4e9f2;
  --color-border: #d4deec;

  /* Text — Navy */
  --color-text: #0e1b33;
  --color-text-muted: #5a6478;
  --color-text-faint: #8a93a6;
  --color-text-inverse: #ffffff;

  /* Primary — Royal Blue */
  --color-primary: #1b4fe0;
  --color-primary-hover: #0b2fb6;
  --color-primary-active: #08218a;
  --color-primary-highlight: #e0e8fc;

  /* Accent — Azure (gradient top) */
  --color-accent: #2e6bff;
  --color-accent-hover: #1b4fe0;
  --color-accent-highlight: #e6eeff;

  /* Brand gradient stops */
  --color-grad-from: #2e6bff;
  --color-grad-to: #0b2fb6;

  /* Spark — Cyan (decorative only) */
  --color-spark: #38bdf8;

  /* Semantic */
  --color-success: #1f8a3b;
  --color-error: #c0392b;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  /* Transition */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows — cool blue tone */
  --shadow-sm: 0 1px 2px oklch(0.2 0.03 250 / 0.06);
  --shadow-md: 0 4px 16px oklch(0.2 0.03 250 / 0.10);
  --shadow-lg: 0 16px 40px oklch(0.2 0.03 250 / 0.16);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 1080px;
  --content-wide: 1240px;

  /* Fonts — brand stack */
  --font-display: 'Inter', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* Type scale (fluid) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.4rem + 2.5vw, 3.25rem);
  --text-3xl: clamp(2.5rem, 1.2rem + 5vw, 4.5rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
}

[data-theme='dark'] {
  /* Midnight surfaces */
  --color-bg: #0a1330;
  --color-surface: #0f1a3d;
  --color-surface-2: #131e45;
  --color-surface-offset: #0e1838;
  --color-surface-offset-2: #16224a;
  --color-surface-dynamic: #1c2a52;
  --color-divider: #1a2444;
  --color-border: #263258;

  --color-text: #e6ecfa;
  --color-text-muted: #9aa4bc;
  --color-text-faint: #6b7693;
  --color-text-inverse: #0e1b33;

  --color-primary: #5b8bff;
  --color-primary-hover: #2e6bff;
  --color-primary-active: #1b4fe0;
  --color-primary-highlight: #1c2a52;

  --color-accent: #5b9bff;
  --color-accent-hover: #2e6bff;
  --color-accent-highlight: #1c2a52;

  --color-grad-from: #2e6bff;
  --color-grad-to: #0b2fb6;

  --color-spark: #38bdf8;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 4px 16px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 16px 40px oklch(0 0 0 / 0.55);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0a1330;
    --color-surface: #0f1a3d;
    --color-surface-2: #131e45;
    --color-surface-offset: #0e1838;
    --color-surface-offset-2: #16224a;
    --color-surface-dynamic: #1c2a52;
    --color-divider: #1a2444;
    --color-border: #263258;
    --color-text: #e6ecfa;
    --color-text-muted: #9aa4bc;
    --color-text-faint: #6b7693;
    --color-text-inverse: #0e1b33;
    --color-primary: #5b8bff;
    --color-primary-hover: #2e6bff;
    --color-primary-active: #1b4fe0;
    --color-primary-highlight: #1c2a52;
    --color-accent: #5b9bff;
    --color-accent-hover: #2e6bff;
    --color-accent-highlight: #1c2a52;
    --color-grad-from: #2e6bff;
    --color-grad-to: #0b2fb6;
    --color-spark: #38bdf8;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
    --shadow-md: 0 4px 16px oklch(0 0 0 / 0.4);
    --shadow-lg: 0 16px 40px oklch(0 0 0 / 0.55);
  }
}