:root { color-scheme: light dark; font-family: system-ui, sans-serif; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: #f4f6f8; color: #20262e; }
main { max-width: 36rem; padding: 3rem; }
h1 { font-size: 1.75rem; }
p { line-height: 1.6; color: #52606d; }
@media (prefers-color-scheme: dark) {
  body { background: #15191e; color: #edf1f5; }
  p { color: #aab4bf; }
}