/* System font stack — zero external requests, works offline */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-mono: 'Courier New', Courier, monospace;
}
body { font-family: var(--font-sans); }