@media (max-width: 768px) {
  .header h1 {
    font-size: 32px;
  }

  .header .subtitle {
    font-size: 16px;
    text-align: center;
  }

  .card-header {
    font-size: 16px;
  }

  .code-grid {
    flex-direction: column;
  }

  .code-card {
    width: 93%;
  }

  .form-group .btn-magic {
    padding: 12px 16px;
    font-size: 16px;
  }
}