body {
      background: linear-gradient(135deg, #2980b9, #6dd5fa);
      min-height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      font-family: 'Segoe UI', sans-serif;
    }
    .login-box {
      background: white;
      padding: 40px;
      border-radius: 15px;
      box-shadow: 0 15px 25px rgba(0, 0, 0, 0.2);
      max-width: 400px;
      width: 100%;
    }
    .login-box h2 {
      margin-bottom: 30px;
      color: #2c3e50;
      text-align: center;
    }
    .form-control {
      margin-bottom: 20px;
      height: 45px;
      font-size: 16px;
    }
    .btn-primary {
      width: 100%;
      padding: 10px;
      font-size: 18px;
    }
    .message {
      margin-top: 15px;
      text-align: center;
      color: red;
    }