:root { color-scheme: light dark; }
body { font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; max-width: 36rem; margin: 5rem auto; padding: 0 1rem; line-height: 1.55; }
h1 { font-weight: 500; letter-spacing: -0.01em; }
p { color: #555; }
@media (prefers-color-scheme: dark) {
  p { color: #aaa; }
}