* {
    box-sizing: border-box;
    font-family: Arial, sans-serif;
  }
  
  body {
    margin: 0;
    background: linear-gradient(135deg, #0f172a, #1e293b);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .container {
    width: 100%;
    padding: 20px;
  }
  
  .card {
    background: #ffffff;
    max-width: 420px;
    margin: auto;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
    text-align: center;
  }
  
  h1 {
    margin-bottom: 10px;
    color: #0f172a;
  }
  
  p {
    color: #64748b;
    font-size: 14px;
    margin-bottom: 25px;
  }
  
  form {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  
  input, select {
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #cbd5e1;
    font-size: 14px;
  }
  
  button {
    padding: 12px;
    border: none;
    border-radius: 8px;
    background: #2563eb;
    color: white;
    font-size: 15px;
    cursor: pointer;
  }
  
  button:hover {
    background: #1d4ed8;
  }
  
  .switch {
    margin-top: 10px;
    font-size: 13px;
  }
  
  .switch a {
    color: #2563eb;
    cursor: pointer;
    font-weight: bold;
  }
  
  .hidden {
    display: none;
  }
  
  /* Responsive */
  @media (max-width: 480px) {
    .card {
      padding: 20px;
    }
  }