* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: #111827;
  color: #f3f4f6;
  text-align: center;
}
main { padding: 24px; }
h1 { font-size: clamp(2rem, 6vw, 3.5rem); margin: 0 0 12px; }
p { font-size: 1.1rem; color: #d1d5db; margin: 0 0 24px; }
small { color: #9ca3af; }