/* Loading state cho archive products */
.is-loading-archive {
    position: relative;
    min-height: 200px;
}

.is-loading-archive::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    z-index: 10;
}

.is-loading-archive::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 11;
}

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

/* Smooth transitions cho products list */
.catexams-ls {
    transition: opacity 0.3s ease;
}

.catexams-ls.is-loading-archive {
    opacity: 0.6;
}

/* Error message styling */
.ajax-error {
    padding: 15px;
    margin: 10px 0;
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 4px;
    color: #721c24;
    text-align: center;
}

/* Success message styling */
.ajax-success {
    padding: 15px;
    margin: 10px 0;
    background: #d4edda;
    border: 1px solid #c3e6cb;
    border-radius: 4px;
    color: #155724;
    text-align: center;
}