:root {
  --bg: #ffffff;
  --fg: #111318;
  --muted: #5f6368;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e8e8ea;
    --muted: #9aa0a6;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 16px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
}
main { text-align: center; }
h1 { margin: 0 0 0.5rem; font-size: clamp(2rem, 8vw, 4rem); }
p { margin: 0; color: var(--muted); font-size: 1.25rem; }