/**
 * BTC University - Library Page Styles
 * Reading materials browser with categories and search
 * 
 * Features:
 * - Category tabs/sidebar
 * - Resource cards (books, articles, videos, podcasts)
 * - Reading list functionality
 * - Search and filter
 */

/* ============================================
   LIBRARY PAGE LAYOUT
============================================ */

.library-page {
    display: flex;
    gap: var(--space-8);
    padding: var(--space-8) 0;
}

/* ============================================
   LIBRARY SIDEBAR
============================================ */

.library-sidebar {
    width: 16rem;
    flex-shrink: 0;
    position: sticky;
    top: calc(var(--header-height) + var(--space-8));
    height: fit-content;
}

/* Search */
.library-search {
    position: relative;
    margin-bottom: var(--space-6);
}

.library-search-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    padding-left: 2.5rem;
    background: var(--btcu-white);
    border: 1px solid var(--btcu-gray-200);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    color: var(--btcu-navy);
    transition: all var(--transition-fast);
}

.library-search-input:focus {
    outline: none;
    border-color: var(--btcu-gold);
    box-shadow: 0 0 0 3px rgba(201, 184, 150, 0.2);
}

.library-search-icon {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    width: 1.25rem;
    height: 1.25rem;
    color: var(--btcu-gray-400);
    pointer-events: none;
}

/* Category Navigation */
.library-categories {
    background: var(--btcu-white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--btcu-gray-200);
    overflow: hidden;
}

.library-category-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--btcu-gray-100);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
}

.library-category-list {
    padding: var(--space-2);
}

.library-category-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--btcu-gray-600);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.library-category-item:hover {
    background: var(--btcu-gray-100);
    color: var(--btcu-navy);
}

.library-category-item.active {
    background: var(--btcu-gold-light);
    color: var(--btcu-navy);
    font-weight: var(--font-medium);
}

.library-category-item svg {
    width: 1.25rem;
    height: 1.25rem;
    opacity: 0.7;
}

.library-category-item.active svg {
    opacity: 1;
    color: var(--btcu-gold-dark);
}

.library-category-count {
    margin-left: auto;
    font-size: var(--text-xs);
    color: var(--btcu-gray-400);
    background: var(--btcu-gray-100);
    padding: var(--space-0) var(--space-2);
    border-radius: var(--radius-full);
}

.library-category-item.active .library-category-count {
    background: rgba(201, 184, 150, 0.3);
    color: var(--btcu-navy);
}

/* Reading List Widget */
.library-reading-list {
    margin-top: var(--space-6);
    background: var(--btcu-white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--btcu-gray-200);
    overflow: hidden;
}

.library-reading-list-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--btcu-gray-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.library-reading-list-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.library-reading-list-title svg {
    width: 1rem;
    height: 1rem;
    color: var(--btcu-gold);
}

.library-reading-list-count {
    font-size: var(--text-xs);
    color: var(--btcu-gray-500);
}

.library-reading-list-items {
    padding: var(--space-3);
    max-height: 15rem;
    overflow-y: auto;
}

.library-reading-list-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.library-reading-list-item:hover {
    background: var(--btcu-gray-100);
}

.library-reading-list-item-icon {
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius-md);
    background: var(--btcu-gold-light);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.library-reading-list-item-icon svg {
    width: 1rem;
    height: 1rem;
    color: var(--btcu-navy);
}

.library-reading-list-item-info {
    flex: 1;
    min-width: 0;
}

.library-reading-list-item-title {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--btcu-navy);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.library-reading-list-item-type {
    font-size: var(--text-xs);
    color: var(--btcu-gray-400);
}

.library-reading-list-empty {
    padding: var(--space-6);
    text-align: center;
    color: var(--btcu-gray-400);
    font-size: var(--text-sm);
}

/* ============================================
   LIBRARY MAIN CONTENT
============================================ */

.library-main {
    flex: 1;
    min-width: 0;
}

/* Library Header */
.library-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.library-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
}

.library-subtitle {
    font-size: var(--text-sm);
    color: var(--btcu-gray-500);
    margin-top: var(--space-1);
}

.library-view-options {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

/* Resource Type Tabs */
.library-tabs {
    display: flex;
    gap: var(--space-1);
    padding: var(--space-1);
    background: var(--btcu-gray-100);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
    overflow-x: auto;
}

.library-tab {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--btcu-gray-600);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.library-tab:hover {
    color: var(--btcu-navy);
}

.library-tab.active {
    background: var(--btcu-white);
    color: var(--btcu-navy);
    box-shadow: var(--shadow-sm);
}

.library-tab svg {
    width: 1rem;
    height: 1rem;
}

.library-tab-count {
    font-size: var(--text-xs);
    color: var(--btcu-gray-400);
}

/* ============================================
   RESOURCE CARDS GRID
============================================ */

.library-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
    gap: var(--space-6);
}

/* Resource Card */
.resource-card {
    background: var(--btcu-white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--btcu-gray-200);
    overflow: hidden;
    transition: all var(--transition-default);
    display: flex;
    flex-direction: column;
}

.resource-card:hover {
    border-color: var(--btcu-gold);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

/* Resource Thumbnail */
.resource-card-thumbnail {
    position: relative;
    aspect-ratio: 3/2;
    background: linear-gradient(135deg, var(--btcu-navy) 0%, var(--btcu-navy-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.resource-card-thumbnail.book {
    background: linear-gradient(135deg, #2D3748 0%, #4A5568 100%);
}

.resource-card-thumbnail.article {
    background: linear-gradient(135deg, #1A365D 0%, #2C5282 100%);
}

.resource-card-thumbnail.video {
    background: linear-gradient(135deg, #742A2A 0%, #9B2C2C 100%);
}

.resource-card-thumbnail.podcast {
    background: linear-gradient(135deg, #22543D 0%, #276749 100%);
}

.resource-card-thumbnail-icon {
    width: 4rem;
    height: 4rem;
    color: var(--btcu-gold);
    opacity: 0.6;
    transition: all var(--transition-default);
}

.resource-card:hover .resource-card-thumbnail-icon {
    transform: scale(1.1);
    opacity: 0.8;
}

/* Resource Type Badge */
.resource-card-type {
    position: absolute;
    top: var(--space-3);
    left: var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--btcu-white);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
}

.resource-card-type svg {
    width: 0.875rem;
    height: 0.875rem;
}

/* Bookmark Button */
.resource-card-bookmark {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    border: none;
    border-radius: var(--radius-full);
    color: var(--btcu-white);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.resource-card-bookmark:hover {
    background: rgba(0, 0, 0, 0.6);
    transform: scale(1.1);
}

.resource-card-bookmark.active {
    background: var(--btcu-gold);
    color: var(--btcu-navy);
}

.resource-card-bookmark svg {
    width: 1rem;
    height: 1rem;
}

/* Duration/Length Badge */
.resource-card-duration {
    position: absolute;
    bottom: var(--space-3);
    right: var(--space-3);
    padding: var(--space-1) var(--space-2);
    background: rgba(0, 0, 0, 0.7);
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--btcu-white);
}

/* Resource Body */
.resource-card-body {
    padding: var(--space-5);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.resource-card-category {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--btcu-gold-dark);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    margin-bottom: var(--space-2);
}

.resource-card-title {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    margin-bottom: var(--space-2);
    line-height: var(--leading-snug);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.resource-card-author {
    font-size: var(--text-sm);
    color: var(--btcu-gray-500);
    margin-bottom: var(--space-3);
}

.resource-card-author strong {
    color: var(--btcu-gray-700);
}

.resource-card-description {
    font-size: var(--text-sm);
    color: var(--btcu-gray-500);
    line-height: var(--leading-relaxed);
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: var(--space-4);
}

/* Resource Meta */
.resource-card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--btcu-gray-100);
}

.resource-card-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-xs);
    color: var(--btcu-gray-500);
}

.resource-card-meta-item svg {
    width: 0.875rem;
    height: 0.875rem;
}

.resource-card-action {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--btcu-orange);
    text-decoration: none;
    transition: gap var(--transition-fast);
}

.resource-card:hover .resource-card-action {
    gap: var(--space-2);
}

.resource-card-action svg {
    width: 1rem;
    height: 1rem;
}

/* ============================================
   FEATURED RESOURCE
============================================ */

.featured-resource {
    display: flex;
    gap: var(--space-6);
    background: var(--btcu-white);
    border-radius: var(--radius-2xl);
    border: 2px solid var(--btcu-gold);
    overflow: hidden;
    margin-bottom: var(--space-8);
}

.featured-resource-thumbnail {
    width: 20rem;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--btcu-navy) 0%, var(--btcu-navy-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.featured-resource-thumbnail svg {
    width: 6rem;
    height: 6rem;
    color: var(--btcu-gold);
    opacity: 0.5;
}

.featured-resource-badge {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--btcu-gold);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    text-transform: uppercase;
}

.featured-resource-badge svg {
    width: 1rem;
    height: 1rem;
    opacity: 1;
}

.featured-resource-content {
    flex: 1;
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.featured-resource-category {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--btcu-gold-dark);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    margin-bottom: var(--space-2);
}

.featured-resource-title {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-3);
}

.featured-resource-description {
    font-size: var(--text-base);
    color: var(--btcu-gray-600);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-4);
}

.featured-resource-meta {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
}

.featured-resource-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--btcu-gray-500);
}

.featured-resource-meta-item svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--btcu-gold);
}

.featured-resource-actions {
    display: flex;
    gap: var(--space-3);
}

/* ============================================
   EMPTY STATE
============================================ */

.library-empty {
    text-align: center;
    padding: var(--space-16) var(--space-8);
}

.library-empty-icon {
    width: 5rem;
    height: 5rem;
    margin: 0 auto var(--space-6);
    color: var(--btcu-gray-300);
}

.library-empty-title {
    font-size: var(--text-xl);
    color: var(--btcu-gray-600);
    margin-bottom: var(--space-2);
}

.library-empty-description {
    font-size: var(--text-base);
    color: var(--btcu-gray-400);
    margin-bottom: var(--space-6);
}

/* ============================================
   RESPONSIVE STYLES
============================================ */

@media (max-width: 1024px) {
    .library-page {
        flex-direction: column;
    }
    
    .library-sidebar {
        width: 100%;
        position: static;
        display: flex;
        flex-wrap: wrap;
        gap: var(--space-4);
    }
    
    .library-search {
        flex: 1;
        min-width: 15rem;
        margin-bottom: 0;
    }
    
    .library-categories {
        flex: 1;
        min-width: 15rem;
    }
    
    .library-reading-list {
        flex: 1;
        min-width: 15rem;
        margin-top: 0;
    }
    
    .featured-resource {
        flex-direction: column;
    }
    
    .featured-resource-thumbnail {
        width: 100%;
        aspect-ratio: 2/1;
    }
}

@media (max-width: 768px) {
    .library-grid {
        grid-template-columns: 1fr;
    }
    
    .library-tabs {
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
    }
    
    .library-header {
        flex-direction: column;
        align-items: flex-start;
    }
}