body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #0b0f21;
  color: #f1f7ff;
  font-family: system-ui, sans-serif;
}
.card {
  text-align: center;
  padding: 2rem 3rem;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  background: rgba(12, 37, 78, 0.85);
}
h1 { margin: 0 0 0.4rem; }
p { margin: 0; opacity: 0.9; }