:root { color-scheme: light dark; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
  background: #f6f6f4;
  color: #222;
}
main { max-width: 32rem; padding: 2rem 1.25rem; }
h1 { font-weight: 600; margin: 0 0 .5rem; }
p { margin: 0; color: #555; }
@media (prefers-color-scheme: dark) {
  body { background: #161616; color: #e6e6e6; }
  p { color: #a0a0a0; }
}