:root {
  color-scheme: light dark;
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-muted: #f1f5f9;
  --color-text: #0f172a;
  --color-text-muted: #475569;
  --color-border: #e2e8f0;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-soft: #eff6ff;
  --color-success: #059669;
  --color-warning: #d97706;
  --color-danger: #dc2626;

  --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;

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --shadow-sm: 0 1px 3px rgb(15 23 42 / 0.1);
  --shadow-md: 0 8px 24px rgb(15 23 42 / 0.12);
  --content-width: 72rem;
  --reading-width: 42rem;
  --transition-fast: 150ms ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #020617;
    --color-surface: #0f172a;
    --color-surface-muted: #1e293b;
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-border: #1e293b;
    --color-primary: #60a5fa;
    --color-primary-hover: #93c5fd;
    --color-primary-soft: rgb(59 130 246 / 0.12);
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-danger: #f87171;
    --shadow-sm: 0 1px 3px rgb(0 0 0 / 0.3);
    --shadow-md: 0 8px 24px rgb(0 0 0 / 0.28);
  }
}