/* 🔄 Einfacher Loading Spinner */
    #loadingSpinner {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        z-index: 9999;
        display: none;
    }
    
    .spinner {
        width: 60px;
        height: 60px;
        border: 5px solid rgba(0, 123, 255, 0.3);
        border-top: 5px solid #007bff;
        border-radius: 50%;
        animation: spin 0.8s linear infinite;
    }
    
    @keyframes spin {
        0% { transform: rotate(0deg); }
        100% { transform: rotate(360deg); }
    }