body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        .card {
            border: none;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        .card-header {
            background: linear-gradient(135deg, #007bff, #0056b3);
            color: white;
            border-radius: 15px 15px 0 0 !important;
            padding: 2rem;
        }
        .btn-primary {
            background: linear-gradient(135deg, #007bff, #0056b3);
            border: none;
            border-radius: 50px;
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,123,255,0.4);
        }
        .form-control {
            border-radius: 10px;
            border: 2px solid #e9ecef;
            padding: 12px 15px;
            transition: all 0.3s ease;
        }
        .form-control:focus {
            border-color: #007bff;
            box-shadow: 0 0 0 0.2rem rgba(0,123,255,0.25);
        }
        .alert {
            border-radius: 10px;
            border: none;
        }
        .back-link {
            color: #6c757d;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .back-link:hover {
            color: #007bff;
        }