:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: #0f0f23; color: #e2e8f0;
}
main { text-align: center; padding: 2rem; max-width: 600px; }
h1 { font-size: clamp(1.5rem, 5vw, 2.5rem); color: #a78bfa; }
p { opacity: 0.8; line-height: 1.6; }