body {
  font-family: system-ui, -apple-system, sans-serif;
  background-color: #0f172a;
  color: #f8fafc;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.card {
  background-color: #1e293b;
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
  text-align: center;
}