:root { color-scheme: light dark; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: #f6f7f4; color: #1c2a1e;
}
main { text-align: center; padding: 24px; }
h1 { font-size: 2rem; margin: 0 0 8px; }
p { font-size: 1.125rem; margin: 0; opacity: .75; }
@media (prefers-color-scheme: dark) {
  body { background: #121812; color: #e6efe6; }
}