:root {
  /* Geist already sits in the same geometric-sans family as x.ai's UI type.
     Metrics below bias toward large, airy display with tight tracking. */
  --font-sans: 'Geist', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  --font-display: var(--font-sans);
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.75rem;
  --text-5xl: 3.75rem;
  /* Between 5xl and display — hero H1 max on large screens */
  --text-hero: 5rem;
  --text-display: 6.5rem;
  /* Display headlines: very tight; body: open for long reading */
  --line-height-tight: 1.08;
  --line-height-snug: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  /* Relative tracking so large type scales cleanly */
  --letter-spacing-tighter: -0.04em;
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.06em;
}