body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f172a;
  color: #ffffff;
}

.container {
  max-width: 480px;
  margin: auto;
  padding: 20px;
  text-align: center;
}

h1 {
  margin-bottom: 25px;
  font-size: 24px;
  letter-spacing: 1px;
}

.btn {
  display: block;
  background: #2563eb;
  color: white;
  padding: 14px;
  margin: 12px 0;
  border-radius: 10px;
  text-decoration: none;
  font-weight: bold;
  transition: 0.2s;
}

.btn:hover {
  background: #1e40af;
}

footer {
  margin-top: 30px;
  font-size: 12px;
  opacity: 0.6;
}