:root{
  /* ===== Typography ===== */
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  --font-serif: ui-serif, Georgia, "Times New Roman", Times, serif;

  /* Type scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;

  /* Line heights */
  --lh-tight: 1.2;
  --lh-base: 1.5;
  --lh-loose: 1.7;

  /* Font weights */
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  /* ===== Spacing scale ===== */
  --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 / shadow ===== */
  --radius-1: 0.5rem;
  --radius-2: 0.75rem;
  --radius-3: 1rem;

  /* ===== Colors ===== */
  --c-bg: #ffffff;
  --c-surface: #ffffff;
  --c-text: #111827;
  --c-muted: #6b7280;
  --c-border: #e5e7eb;

  --c-brand: #2563eb;
  --c-brand-contrast: #ffffff;

  --c-link: var(--c-brand);
  --c-link-hover: #1d4ed8;

  /* ===== Layout tokens ===== */
  --container-max: 1200px;
}