/* Materials Page Styles */

.materials-page {
    /* Scoped container for all materials-specific styles */
}

/* Loading Container */
.materials-page .loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
    padding: 2rem;
}

.materials-page .loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-light);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

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

/* Header */
.materials-page .materials-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-light);
}

.materials-page .header-left h1 {
    margin: 0 0 0.5rem 0;
    font-size: 2rem;
    color: var(--primary);
}

.materials-page .header-left p {
    margin: 0;
    color: var(--text-medium);
    font-size: 1rem;
}

/* Filter Section - Clean minimal style */
.materials-page .filter-section {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: end;
    margin-bottom: 2rem;
    padding: 0;
    background: transparent;
    border-radius: 0;
    box-shadow: none;
}

.materials-page .filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 150px;
    position: relative;
}

.materials-page .filter-group label {
    font-weight: 500;
    color: var(--text-dark);
    font-size: 0.9rem;
}

.materials-page .search-group {
    flex: 1;
    min-width: 200px;
}

/* Unified input and select styles */
.materials-page .filter-input,
.materials-page .filter-select {
    padding: 0.8rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    background: var(--white);
    transition: none;
    color: var(--text-dark);
    width: 100%;
}

.materials-page .filter-input:focus,
.materials-page .filter-select:focus {
    outline: none;
    border-color: var(--border);
}

/* Search clear button - positioned absolute */
.materials-page .search-clear-btn {
    position: absolute;
    right: 0.5rem;
    bottom: 0.5rem;
    background: none;
    border: none;
    color: var(--text-medium);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.materials-page .search-clear-btn:hover {
    background: var(--bg-light);
}

/* Clean reset button */
.materials-page .reset-filters-btn {
    padding: 0.8rem 1.2rem;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-medium);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    transition: var(--transition);
}

.materials-page .reset-filters-btn:hover {
    border-color: var(--text-medium);
    color: var(--text-dark);
}

/* Materials Content */
.materials-page .materials-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.materials-page .results-info {
    font-weight: 500;
    color: var(--text-dark);
}

/* Empty State */
.materials-page .empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.materials-page .empty-icon {
    margin-bottom: 1.5rem;
}

.materials-page .empty-icon i {
    font-size: 4rem;
    color: var(--text-medium);
    opacity: 0.5;
}

.materials-page .empty-state h3 {
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.materials-page .empty-state p {
    margin-bottom: 2rem;
    color: var(--text-medium);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* Materials Grid */
.materials-page .materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

/* Material Card */
.materials-page .material-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid var(--border-light);
}

.materials-page .material-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.materials-page .material-thumbnail {
    position: relative;
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
}

.materials-page .material-thumbnail.article {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.materials-page .material-thumbnail.video {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.materials-page .material-thumbnail.series {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
}

.materials-page .material-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.materials-page .thumbnail-icon {
    font-size: 2.5rem;
    opacity: 0.9;
}

.materials-page .material-type-badge {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    background: rgba(0, 0, 0, 0.7);
    color: var(--white);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: capitalize;
}

.materials-page .material-duration {
    position: absolute;
    bottom: 0.75rem;
    right: 0.75rem;
    background: rgba(0, 0, 0, 0.7);
    color: var(--white);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.materials-page .material-content {
    padding: 1.5rem;
}

.materials-page .material-subject {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1rem;
}

.materials-page .material-subject.mathematics {
    background: #dbeafe;
    color: #1d4ed8;
}

.materials-page .material-subject.physics {
    background: #fef3c7;
    color: #92400e;
}

.materials-page .material-subject.chemistry {
    background: #dcfce7;
    color: #166534;
}

.materials-page .material-title {
    margin: 0 0 0.75rem 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.materials-page .material-description {
    margin: 0 0 1.5rem 0;
    color: var(--text-medium);
    line-height: 1.5;
    font-size: 0.9rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.materials-page .material-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.materials-page .material-difficulty {
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: capitalize;
}

.materials-page .material-difficulty.beginner {
    background: #dcfce7;
    color: #166534;
}

.materials-page .material-difficulty.intermediate {
    background: #fef3c7;
    color: #92400e;
}

.materials-page .material-difficulty.advanced {
    background: #fee2e2;
    color: #dc2626;
}

.materials-page .material-stats {
    display: flex;
    gap: 1rem;
}

.materials-page .material-stat {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.85rem;
    color: var(--text-medium);
}

.materials-page .material-stat i {
    font-size: 1rem;
}

/* Pagination */
.materials-page .pagination-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 0;
    border-top: 1px solid var(--border-light);
}

.materials-page .pagination-section.column {
    flex-direction: column;
    gap: 1rem;
}

.materials-page .pagination-controls {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.materials-page .pagination-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--white);
    border: 2px solid var(--border-light);
    border-radius: 8px;
    color: var(--text-dark);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.materials-page .pagination-btn:not(:disabled):hover {
    border-color: var(--primary);
    color: var(--primary);
}

.materials-page .pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.materials-page .pagination-info {
    color: var(--text-medium);
    font-weight: 500;
}

/* Modal */
.materials-page .modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.materials-page .modal-overlay.show {
    opacity: 1;
}

.materials-page .modal-content {
    background: var(--white);
    border-radius: 12px;
    max-width: 800px;
    max-height: 90vh;
    width: 90%;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.materials-page .modal-overlay.show .modal-content {
    transform: scale(1);
}

.materials-page .modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-light);
}

.materials-page .modal-header h3 {
    margin: 0;
    font-size: 1.3rem;
    color: var(--text-dark);
}

.materials-page .modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-medium);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: background 0.3s ease;
}

.materials-page .modal-close:hover {
    background: var(--bg-light);
}

.materials-page .modal-body {
    padding: 2rem;
}

.materials-page .modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border-light);
}

/* Material Detail Modal Specific */
.materials-page .material-detail-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.materials-page .material-detail-header {
    display: flex;
    gap: 1.5rem;
}

.materials-page .material-detail-thumbnail {
    width: 150px;
    height: 100px;
    border-radius: 8px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.materials-page .material-detail-thumbnail.article {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.materials-page .material-detail-thumbnail.video {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.materials-page .material-detail-thumbnail.series {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
}

.materials-page .thumbnail-placeholder {
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    text-align: center;
    opacity: 0.9;
}

.materials-page .material-detail-info {
    flex: 1;
}

.materials-page .material-type-inline {
    padding: 0.2rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 4px;
    text-transform: uppercase;
}

.materials-page .material-type-inline.article {
    background: #dbeafe;
    color: #1d4ed8;
}

.materials-page .material-type-inline.video {
    background: #fef3c7;
    color: #92400e;
}

.materials-page .material-type-inline.series {
    background: #dcfce7;
    color: #166534;
}

.materials-page .material-detail-info h4 {
    margin: 0.5rem 0 1rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.materials-page .material-detail-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin: 1rem 0;
}

.materials-page .meta-item {
    font-size: 0.875rem;
    color: #64748b;
}

.materials-page .meta-item strong {
    color: #1e293b;
}

.materials-page .material-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.materials-page .tag {
    background: #f1f5f9;
    color: #475569;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}


/* Responsive Design */
@media (max-width: 768px) {
    .materials-page .materials-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .materials-page .filter-section {
        flex-direction: column;
        align-items: stretch;
    }

    .materials-page .filter-group {
        min-width: auto;
    }

    .materials-page .materials-grid {
        grid-template-columns: 1fr;
    }

    .materials-page .material-detail-header {
        flex-direction: column;
    }

    .materials-page .material-detail-thumbnail {
        width: 100%;
        height: 120px;
    }

    .materials-page .material-detail-meta {
        grid-template-columns: 1fr;
    }

    .materials-page .pagination-section {
        flex-direction: column;
        gap: 1rem;
    }

    .materials-page .pagination-controls {
        flex-direction: column;
        gap: 1rem;
    }

    .materials-page .modal-content {
        width: 95%;
        margin: 1rem;
    }

    .materials-page .modal-header,
    .materials-page .modal-body,
    .materials-page .modal-footer {
        padding: 1rem 1.5rem;
    }

    .materials-page .modal-footer {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .materials-page .search-group {
        min-width: auto;
    }

    .materials-page .material-card {
        margin-bottom: 1rem;
    }

    .materials-page .pagination-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }
}