.loading {
    display: none;
    text-align: center;
    padding: 20px;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.9);
    z-index: 1000;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.loading-spinner {
    display: inline-block;
    width: 50px;
    height: 50px;
    border: 3px solid #f3f3f3;
    border-radius: 50%;
    border-top: 3px solid #3498db;
    animation: spin 1s linear infinite;
    margin-bottom: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}