body {
  margin: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, BlinkMacSystemFont;
  background: linear-gradient(135deg, #0f172a, #020617);
  color: #fff;
}

.card {
  background: rgba(255,255,255,0.05);
  padding: 40px;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 20px 40px rgba(0,0,0,.4);
  max-width: 420px;
}

h1 {
  margin: 0 0 12px;
  font-size: 28px;
}

p {
  margin: 0;
  opacity: 0.8;
  line-height: 1.6;
}