:root { color-scheme: light dark; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; line-height: 1.5;
  background: #ffffff; color: #1a1a1a; }
main { max-width: 36rem; margin: 0 auto; padding: 4rem 1.25rem; }
h1 { font-size: 1.75rem; line-height: 1.2; margin: 0 0 1rem; }
p { font-size: 1.125rem; margin: 0 0 1rem; }
@media (prefers-color-scheme: dark) { body { background: #111111; color: #f2f2f2; } }