:root {
  color-scheme: light dark;

  --brand-blue-900: #0c1e4a;
  --brand-blue-700: #1e3a8a;
  --brand-blue-500: #2563eb;
  --brand-blue-300: #60a5fa;
  --brand-teal-700: #0f766e;
  --brand-teal-500: #14b8a6;
  --brand-teal-300: #5eead4;

  --brand-gradient: linear-gradient(135deg, #1e3a8a 0%, #2563eb 35%, #0d9488 70%, #14b8a6 100%);
  --brand-gradient-soft: linear-gradient(135deg, rgba(37, 99, 235, 0.18) 0%, rgba(20, 184, 166, 0.18) 100%);
  --brand-glow: 0 0 0 1px rgba(37, 99, 235, 0.4), 0 12px 40px -12px rgba(37, 99, 235, 0.55);

  --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: 160px;

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;

  --font-display: "Space Grotesk", ui-sans-serif, sans-serif;
  --font-body: "General Sans", "Space Grotesk", ui-sans-serif, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  --fs-overline: 12px;
  --fs-caption: 13px;
  --fs-body: 16px;
  --fs-body-lg: 18px;
  --fs-h5: 20px;
  --fs-h4: 26px;
  --fs-h3: 34px;
  --fs-h2: 46px;
  --fs-h1: 64px;
  --fs-display: clamp(38px, 8.5vw, 96px);

  --fw-thin: 200;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-black: 800;

  --lh-tight: 1.05;
  --lh-snug: 1.2;
  --lh-normal: 1.55;
  --lh-loose: 1.75;

  --transition-fast: 140ms cubic-bezier(0.2, 0.8, 0.2, 1);
  --transition-base: 240ms cubic-bezier(0.2, 0.8, 0.2, 1);
  --transition-slow: 480ms cubic-bezier(0.2, 0.8, 0.2, 1);

  --z-base: 1;
  --z-elevated: 10;
  --z-nav: 50;
  --z-modal: 100;

  --container-max: 1240px;
  --container-pad: clamp(20px, 4vw, 48px);

  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
}

:root,
:root[data-theme="light"] {
  --bg-page: #f7f9fc;
  --bg-surface: #ffffff;
  --bg-elevated: #ffffff;
  --bg-muted: #eef2f7;
  --bg-inverse: #0a1220;

  --ink-1: #0a1220;
  --ink-2: #1f2937;
  --ink-3: #475569;
  --ink-4: #64748b;
  --ink-onbrand: #ffffff;

  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-default: rgba(15, 23, 42, 0.14);
  --border-strong: rgba(15, 23, 42, 0.24);

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 1px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 20px -8px rgba(15, 23, 42, 0.14), 0 4px 8px -4px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 28px 60px -20px rgba(15, 23, 42, 0.18), 0 12px 24px -12px rgba(15, 23, 42, 0.1);

  --mesh-1: radial-gradient(at 12% 18%, rgba(37, 99, 235, 0.22) 0px, transparent 50%);
  --mesh-2: radial-gradient(at 88% 12%, rgba(20, 184, 166, 0.22) 0px, transparent 50%);
  --mesh-3: radial-gradient(at 60% 90%, rgba(96, 165, 250, 0.18) 0px, transparent 55%);
}

:root[data-theme="dark"] {
  --bg-page: #0a1220;
  --bg-surface: #111a2e;
  --bg-elevated: #1a2540;
  --bg-muted: #131c33;
  --bg-inverse: #f7f9fc;

  --ink-1: #f8fafc;
  --ink-2: #e2e8f0;
  --ink-3: #94a3b8;
  --ink-4: #64748b;
  --ink-onbrand: #ffffff;

  --border-subtle: rgba(148, 163, 184, 0.1);
  --border-default: rgba(148, 163, 184, 0.18);
  --border-strong: rgba(148, 163, 184, 0.3);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 12px 28px -10px rgba(0, 0, 0, 0.5), 0 4px 10px -4px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 32px 64px -16px rgba(0, 0, 0, 0.6), 0 12px 28px -8px rgba(0, 0, 0, 0.4);

  --mesh-1: radial-gradient(at 12% 18%, rgba(37, 99, 235, 0.35) 0px, transparent 50%);
  --mesh-2: radial-gradient(at 88% 12%, rgba(20, 184, 166, 0.32) 0px, transparent 50%);
  --mesh-3: radial-gradient(at 60% 90%, rgba(30, 58, 138, 0.45) 0px, transparent 55%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg-page: #0a1220;
    --bg-surface: #111a2e;
    --bg-elevated: #1a2540;
    --bg-muted: #131c33;
    --bg-inverse: #f7f9fc;

    --ink-1: #f8fafc;
    --ink-2: #e2e8f0;
    --ink-3: #94a3b8;
    --ink-4: #64748b;
    --ink-onbrand: #ffffff;

    --border-subtle: rgba(148, 163, 184, 0.1);
    --border-default: rgba(148, 163, 184, 0.18);
    --border-strong: rgba(148, 163, 184, 0.3);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 12px 28px -10px rgba(0, 0, 0, 0.5), 0 4px 10px -4px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 32px 64px -16px rgba(0, 0, 0, 0.6), 0 12px 28px -8px rgba(0, 0, 0, 0.4);

    --mesh-1: radial-gradient(at 12% 18%, rgba(37, 99, 235, 0.35) 0px, transparent 50%);
    --mesh-2: radial-gradient(at 88% 12%, rgba(20, 184, 166, 0.32) 0px, transparent 50%);
    --mesh-3: radial-gradient(at 60% 90%, rgba(30, 58, 138, 0.45) 0px, transparent 55%);
  }
}