:root { color-scheme: dark; }
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(circle at 30% 20%, #1e293b, #0b1120 70%);
  color: #e2e8f0;
  padding: 1.5rem;
}
.card {
  text-align: center;
  max-width: 32rem;
}
.logo {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #38bdf8;
  margin-bottom: 2rem;
}
h1 {
  font-size: clamp(2rem, 6vw, 3.25rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1rem;
}
p {
  font-size: 1.05rem;
  color: #94a3b8;
}