body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: system-ui, sans-serif;
  background: #fafafa;
  color: #111;
}

main {
  text-align: center;
  padding: 1rem;
}

h1 {
  font-size: clamp(2rem, 6vw, 4rem);
  margin: 0 0 0.5rem;
}

@media (prefers-color-scheme: dark) {
  body { background: #111; color: #eee; }
}