.login-options {
            display: flex;
            gap: 20px;
            margin: 30px 0;
            align-items: stretch;
        }
        .login-card {
            flex: 1;
            padding: 25px;
            border-radius: 8px;
            background: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            display: flex;
            flex-direction: column;
        }
        .card-content {
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .card-button {
            margin-top: auto;
            padding: 20px 15px 0 15px;
        }
        .btn-cac, .btn-manual {
            width: calc(100% - 10px);
            margin: 0 5px;
            padding: 12px;
            font-size: 16px;
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .btn-cac {
            background-color: #007bff;
            color: white;
            border: none;
        }
        .btn-manual {
            background-color: #6c757d;
            color: white;
            border: none;
        }
        .btn-cac:hover, .btn-manual:hover {
            opacity: 0.9;
        }
        .icon {
            font-size: 18px;
        }
    .spinner {
        border: 3px solid rgba(0, 0, 0, 0.1);
        border-radius: 50%;
        border-top: 3px solid #007bff;
        width: 20px;
        height: 20px;
        animation: spin 1s linear infinite;
    }
    
    @keyframes spin {
        0% { transform: rotate(0deg); }
        100% { transform: rotate(360deg); }
    }