body {
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      font-family: Arial, sans-serif;
      background: #f4f4f4;
    }
  
  .login-container {
      background: white;
      padding: 2rem;
      border-radius: 12px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      width: 300px;
    }
    h2 {
      text-align: center;
      margin-bottom: 1.5rem;
    }
    input {
      width: 100%;
      padding: 0.6rem;
      margin: 0.5rem 0;
      border: 1px solid #ccc;
      border-radius: 8px;
    }
    button {
      width: 100%;
      padding: 0.7rem;
      border: none;
      border-radius: 8px;
      background: #2563eb;
      color: white;
      font-weight: bold;
      cursor: pointer;
    }
    button:hover {
      background: #1e40af;
    }
    .message {
      margin-top: 1rem;
      text-align: center;
      font-weight: bold;
    }
    .error {
      color: red;
    }
    .success {
      color: green;
    }