/* Menu Filter Styles */
#lstTainguyen .list-group-item,
#lstDangtl .list-group-item,
#lstTacgia .list-group-item {
    cursor: pointer;
    transition: all 0.2s ease;
}

    #lstTainguyen .list-group-item:hover,
    #lstDangtl .list-group-item:hover,
    #lstTacgia .list-group-item:hover {
        background-color: #e9ecef;
        transform: translateX(2px);
    }

    #lstTainguyen .list-group-item.active,
    #lstDangtl .list-group-item.active,
    #lstTacgia .list-group-item.active {
        background-color: #0d6efd;
        color: white;
        border-color: #0d6efd;
    }

        #lstTainguyen .list-group-item.active .badge,
        #lstDangtl .list-group-item.active .badge,
        #lstTacgia .list-group-item.active .badge {
            background-color: white !important;
            color: #0d6efd !important;
        }

.stat-card {
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

    .stat-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 16px rgba(0,0,0,0.15) !important;
    }

.facet-item {
    cursor: pointer;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

    .facet-item:hover {
        background-color: #f8f9fa !important;
        border-left-color: #0d6efd;
        transform: translateX(2px);
    }

    .facet-item.active {
        background-color: #0d6efd !important;
        color: white !important;
        border-left-color: #0b5ed7;
    }

        .facet-item.active .badge {
            background-color: white !important;
            color: #0d6efd !important;
        }

.bg-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

#active-filters .badge {
    cursor: pointer;
    transition: all 0.2s;
}

    #active-filters .badge:hover {
        transform: scale(1.05);
        box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    }

/* ============================================================================
   COLLECTION & COURSE METADATA STYLES
   ============================================================================ */

/* Metadata Container */
#collectionMetadata {
    animation: fadeInUp 0.4s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Breadcrumb Styling */
.collection-breadcrumb,
.course-breadcrumb {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border: 1px solid #dee2e6;
    border-radius: 0.75rem;
    padding: 1rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

    .collection-breadcrumb ol,
    .course-breadcrumb ol {
        list-style: none;
        padding: 0;
        margin: 0;
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 0.5rem;
    }

    .collection-breadcrumb li,
    .course-breadcrumb li {
        list-style: none;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .collection-breadcrumb a,
    .course-breadcrumb a {
        color: #0d6efd;
        text-decoration: none;
        font-weight: 500;
        transition: all 0.2s ease;
        padding: 0.25rem 0.5rem;
        border-radius: 0.375rem;
    }

        .collection-breadcrumb a:hover,
        .course-breadcrumb a:hover {
            background-color: #0d6efd;
            color: white;
            transform: translateY(-1px);
        }

    .collection-breadcrumb .bi-chevron-right,
    .course-breadcrumb .bi-chevron-right {
        color: #6c757d;
        font-size: 0.75rem;
    }

/* SubCollections Grid */
.subcollections-container {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    border: 2px solid #81c784;
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

    .subcollections-container h3 {
        color: #2e7d32;
        font-weight: 700;
        margin-bottom: 1rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

        .subcollections-container h3 i {
            font-size: 1.75rem;
        }

.subcollection-item {
    background: white;
    border: 2px solid transparent;
    border-radius: 0.625rem;
    padding: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    display: block;
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
}

    .subcollection-item::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 4px;
        height: 100%;
        background: linear-gradient(180deg, #4caf50 0%, #66bb6a 100%);
        transform: scaleY(0);
        transition: transform 0.3s ease;
    }

    .subcollection-item:hover {
        border-color: #4caf50;
        box-shadow: 0 8px 24px rgba(76, 175, 80, 0.2);
        transform: translateY(-4px);
    }

        .subcollection-item:hover::before {
            transform: scaleY(1);
        }

    .subcollection-item .bi-folder-fill,
    .subcollection-item .bi-folder {
        font-size: 1.5rem;
        transition: transform 0.3s ease;
    }

    .subcollection-item:hover .bi-folder-fill,
    .subcollection-item:hover .bi-folder {
        transform: scale(1.1);
    }

.subcollection-name {
    font-weight: 600;
    color: #212529;
    font-size: 0.95rem;
    line-height: 1.4;
    margin-bottom: 0.5rem;
}

.subcollection-code {
    font-family: 'Courier New', monospace;
    font-size: 0.75rem;
    color: #6c757d;
    font-weight: 600;
    background: #f8f9fa;
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    margin-right: 0.375rem;
}

.subcollection-count {
    font-size: 0.875rem;
    color: #6c757d;
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

    .subcollection-count i {
        color: #4caf50;
    }

/* Collection Hierarchy Styles */
.collection-hierarchy,
.course-hierarchy {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border: 2px solid #64b5f6;
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    font-size: 0.9rem;
}

    .collection-hierarchy h3,
    .course-hierarchy h3 {
        color: #1565c0;
        font-weight: 700;
        margin-bottom: 1rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

        .collection-hierarchy h3 i,
        .course-hierarchy h3 i {
            font-size: 1.75rem;
        }

.hierarchy-node {
    transition: all 0.2s ease;
    border-radius: 0.5rem;
    padding: 0.5rem 0.75rem;
    margin: 0.25rem 0;
}

    .hierarchy-node:hover {
        background: rgba(33, 150, 243, 0.1);
    }

    .hierarchy-node.current {
        background: linear-gradient(90deg, rgba(33, 150, 243, 0.2) 0%, rgba(33, 150, 243, 0.05) 100%);
        border-left: 4px solid #2196f3;
        font-weight: 600;
        position: relative;
    }

        .hierarchy-node.current::after {
            content: '';
            position: absolute;
            right: 0.75rem;
            top: 50%;
            transform: translateY(-50%);
            width: 8px;
            height: 8px;
            background: #2196f3;
            border-radius: 50%;
            box-shadow: 0 0 0 4px rgba(33, 150, 243, 0.2);
        }

    .hierarchy-node a {
        color: #212529;
        text-decoration: none;
        transition: color 0.2s ease;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

        .hierarchy-node a:hover {
            color: #1976d2;
        }

    .hierarchy-node .bi-folder-fill,
    .hierarchy-node .bi-folder {
        font-size: 1.25rem;
    }

.hierarchy-badge {
    background: rgba(33, 150, 243, 0.1);
    color: #1565c0;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 0.375rem;
    font-weight: 600;
}

.hierarchy-code {
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    color: #5c6bc0;
    background: rgba(92, 107, 192, 0.1);
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-weight: 600;
}

/* Responsive Grid for SubCollections */
@media (max-width: 768px) {
    .subcollections-grid {
        grid-template-columns: 1fr !important;
    }

    .subcollection-item {
        padding: 0.875rem;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .subcollections-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

/* Separator between metadata and results */
.metadata-results-separator {
    border-top: 3px solid #dee2e6;
    margin: 2rem 0;
    position: relative;
}

    .metadata-results-separator::before {
        content: 'KẾT QUẢ TÌM KIẾM';
        position: absolute;
        top: -0.75rem;
        left: 50%;
        transform: translateX(-50%);
        background: white;
        padding: 0 1rem;
        font-size: 0.875rem;
        font-weight: 700;
        color: #6c757d;
        letter-spacing: 0.05em;
    }

/* Smooth transitions */
#collectionMetadata > * {
    animation: slideInUp 0.4s ease-out;
    animation-fill-mode: both;
}

    #collectionMetadata > *:nth-child(1) {
        animation-delay: 0.1s;
    }

    #collectionMetadata > *:nth-child(2) {
        animation-delay: 0.2s;
    }

    #collectionMetadata > *:nth-child(3) {
        animation-delay: 0.3s;
    }

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(15px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Empty state styling */
.metadata-empty {
    text-align: center;
    padding: 2rem;
    color: #6c757d;
    font-style: italic;
}

    .metadata-empty i {
        font-size: 3rem;
        margin-bottom: 1rem;
        opacity: 0.5;
    }