/**
 * Digital Library Stylesheet
 * Premium, Modern Design for Academic Repository
 * Skill Tech LMS
 */

:root {
    /* Primary Colors */
    --lib-primary: #1e3a5f;
    --lib-primary-light: #2d5a8a;
    --lib-primary-dark: #132740;
    --lib-accent: #c9a227;
    --lib-accent-light: #e5c35c;
    
    /* UI Colors */
    --lib-success: #10b981;
    --lib-warning: #f59e0b;
    --lib-danger: #ef4444;
    --lib-info: #3b82f6;
    
    /* Background Colors */
    --lib-bg-primary: #ffffff;
    --lib-bg-secondary: #f8fafc;
    --lib-bg-tertiary: #f1f5f9;
    --lib-bg-card: #ffffff;
    
    /* Text Colors */
    --lib-text-primary: #1e293b;
    --lib-text-secondary: #64748b;
    --lib-text-light: #94a3b8;
    --lib-text-inverse: #ffffff;
    
    /* Border & Shadow */
    --lib-border: #e2e8f0;
    --lib-border-light: #f1f5f9;
    --lib-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --lib-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --lib-shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
    --lib-shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
    
    /* Layout */
    --lib-header-height: 80px;
    --lib-nav-height: 56px;
    --lib-topbar-height: 40px;
    --lib-container-width: 1400px;
    
    /* Typography */
    --lib-font-primary: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --lib-font-display: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Transitions */
    --lib-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
[data-theme="dark"] {
    --lib-primary: #3b82f6;
    --lib-primary-light: #60a5fa;
    --lib-primary-dark: #1e40af;
    --lib-accent: #fbbf24;
    
    --lib-bg-primary: #0f172a;
    --lib-bg-secondary: #1e293b;
    --lib-bg-tertiary: #334155;
    --lib-bg-card: #1e293b;
    
    --lib-text-primary: #f1f5f9;
    --lib-text-secondary: #94a3b8;
    --lib-text-light: #64748b;
    
    --lib-border: #334155;
    --lib-border-light: #475569;
    
    --lib-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --lib-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --lib-shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--lib-font-primary);
    font-size: 15px;
    line-height: 1.6;
    color: var(--lib-text-primary);
    background: var(--lib-bg-secondary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* Ensure Montserrat is applied to all elements */
*, *::before, *::after {
    font-family: inherit;
}

input, button, select, textarea {
    font-family: var(--lib-font-primary);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--lib-transition);
}

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   TOP BAR
   ============================================ */
.library-topbar {
    background: var(--lib-primary-dark);
    height: var(--lib-topbar-height);
    display: flex;
    align-items: center;
    color: white;
}

.topbar-container {
    max-width: var(--lib-container-width);
    margin: 0 auto;
    padding: 0 30px;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.back-to-lms {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 13px;
    font-weight: 500;
}

.back-to-lms:hover {
    color: var(--lib-accent);
}

.topbar-brand {
    color: rgba(255, 255, 255, 0.8);
    font-size: 13px;
    font-weight: 500;
}

.topbar-info {
    color: rgba(255, 255, 255, 0.7);
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ============================================
   MAIN HEADER
   ============================================ */
.library-header {
    background: var(--lib-bg-primary);
    height: var(--lib-header-height);
    border-bottom: 1px solid var(--lib-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--lib-shadow-sm);
}

.header-container {
    max-width: var(--lib-container-width);
    margin: 0 auto;
    padding: 0 30px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

/* Brand */
.brand-link {
    display: flex;
    align-items: center;
    gap: 15px;
}

.brand-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--lib-primary) 0%, var(--lib-primary-light) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--lib-text-inverse);
    box-shadow: 0 4px 15px rgba(30, 58, 95, 0.3);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-family: var(--lib-font-display);
    font-size: 22px;
    font-weight: 700;
    color: var(--lib-primary);
    letter-spacing: -0.5px;
}

.brand-subtitle {
    font-size: 12px;
    color: var(--lib-text-secondary);
    font-weight: 500;
}

/* Search */
.header-search {
    flex: 1;
    max-width: 600px;
}

.search-form {
    width: 100%;
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--lib-bg-tertiary);
    border: 2px solid transparent;
    border-radius: 50px;
    transition: var(--lib-transition);
    overflow: hidden;
}

.search-input-wrapper:focus-within {
    background: var(--lib-bg-primary);
    border-color: var(--lib-primary);
    box-shadow: 0 0 0 4px rgba(30, 58, 95, 0.1);
}

.search-icon {
    position: absolute;
    left: 20px;
    color: var(--lib-text-light);
    font-size: 16px;
}

.search-input {
    flex: 1;
    padding: 14px 20px 14px 50px;
    border: none;
    background: transparent;
    font-size: 15px;
    color: var(--lib-text-primary);
    outline: none;
    font-family: inherit;
}

.search-input::placeholder {
    color: var(--lib-text-light);
}

.search-btn {
    padding: 10px 25px;
    margin: 4px;
    background: linear-gradient(135deg, var(--lib-primary) 0%, var(--lib-primary-light) 100%);
    color: var(--lib-text-inverse);
    border: none;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--lib-transition);
}

.search-btn:hover {
    transform: translateX(-2px);
    box-shadow: 0 4px 15px rgba(30, 58, 95, 0.3);
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.action-btn {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--lib-bg-tertiary);
    border: 1px solid var(--lib-border);
    color: var(--lib-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    cursor: pointer;
    transition: var(--lib-transition);
}

.action-btn:hover {
    background: var(--lib-primary);
    color: var(--lib-text-inverse);
    border-color: var(--lib-primary);
    transform: translateY(-2px);
}

.mobile-menu-btn {
    display: none;
}

/* ============================================
   NAVIGATION BAR
   ============================================ */
.library-nav {
    background: var(--lib-primary);
    height: var(--lib-nav-height);
    position: sticky;
    top: var(--lib-header-height);
    z-index: 999;
}

.nav-container {
    max-width: var(--lib-container-width);
    margin: 0 auto;
    padding: 0 30px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 5px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--lib-transition);
    white-space: nowrap;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--lib-text-inverse);
}

.nav-link.active {
    background: rgba(255, 255, 255, 0.15);
    color: var(--lib-text-inverse);
}

.nav-link i {
    font-size: 14px;
    flex-shrink: 0;
}

.nav-link span {
    white-space: nowrap;
}

/* Desktop/Mobile visibility for nav items */
.nav-item-mobile {
    display: none;
}

.nav-item-desktop {
    display: block;
}

/* Medium screens - show fewer items */
@media (max-width: 1200px) {
    .nav-item-desktop:nth-child(n+5) {
        display: none;
    }
    
    /* Show first category in More dropdown on medium screens */
    .nav-item.dropdown.nav-item-desktop {
        display: block;
    }
}

/* Dropdown */
.dropdown-arrow {
    font-size: 10px;
    margin-left: 4px;
    transition: transform 0.3s;
}

.nav-item.active .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--lib-bg-primary);
    border-radius: 12px;
    box-shadow: var(--lib-shadow-lg);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--lib-transition);
    z-index: 1000;
}

.nav-item.active .dropdown-menu,
.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(5px);
}

.dropdown-menu li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--lib-text-primary);
    border-radius: 8px;
    font-size: 14px;
}

.dropdown-menu li a:hover {
    background: var(--lib-bg-tertiary);
    color: var(--lib-primary);
}

.dropdown-menu li a i {
    width: 20px;
    color: var(--lib-text-secondary);
}

/* Nav Stats */
.nav-stats {
    display: flex;
    gap: 15px;
}

.stat-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 13px;
    font-weight: 500;
}

.stat-badge i {
    color: var(--lib-accent);
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.library-main {
    min-height: calc(100vh - var(--lib-header-height) - var(--lib-nav-height) - var(--lib-topbar-height));
    padding: 40px 0;
}

.main-container {
    max-width: var(--lib-container-width);
    margin: 0 auto;
    padding: 0 30px;
}

/* Page Header */
.page-header {
    margin-bottom: 40px;
}

.page-title {
    font-family: var(--lib-font-display);
    font-size: 36px;
    font-weight: 700;
    color: var(--lib-text-primary);
    margin-bottom: 10px;
}

.page-subtitle {
    font-size: 16px;
    color: var(--lib-text-secondary);
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 25px;
    font-size: 14px;
}

.breadcrumb a {
    color: var(--lib-text-secondary);
}

.breadcrumb a:hover {
    color: var(--lib-primary);
}

.breadcrumb .separator {
    color: var(--lib-text-light);
}

.breadcrumb .current {
    color: var(--lib-text-primary);
    font-weight: 500;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero-section {
    background: linear-gradient(135deg, var(--lib-primary) 0%, var(--lib-primary-light) 50%, #4a7ab0 100%);
    border-radius: 24px;
    padding: 60px;
    margin-bottom: 50px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="rgba(255,255,255,0.05)"/></svg>');
    background-size: 100px;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
}

.hero-title {
    font-family: var(--lib-font-display);
    font-size: 42px;
    font-weight: 700;
    color: var(--lib-text-inverse);
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 30px;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.hero-stat {
    text-align: center;
}

.hero-stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--lib-accent);
}

.hero-stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 5px;
}

/* ============================================
   SECTION HEADERS
   ============================================ */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
}

.section-title {
    font-family: var(--lib-font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--lib-text-primary);
}

.section-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--lib-primary);
    font-weight: 600;
    font-size: 14px;
}

.section-link:hover {
    gap: 12px;
}

/* ============================================
   CATEGORY CARDS
   ============================================ */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 50px;
}

.category-card {
    background: var(--lib-bg-card);
    border-radius: 16px;
    padding: 25px 20px;
    text-align: center;
    border: 1px solid var(--lib-border);
    transition: var(--lib-transition);
    cursor: pointer;
    opacity: 0;
    transform: translateY(20px);
}

.category-card.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.category-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--lib-shadow-lg);
    border-color: transparent;
}

.category-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 15px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--lib-text-inverse);
    transition: var(--lib-transition);
}

.category-card:hover .category-icon {
    transform: scale(1.1) rotate(5deg);
}

.category-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--lib-text-primary);
    margin-bottom: 5px;
}

.category-count {
    font-size: 13px;
    color: var(--lib-text-secondary);
}

/* ============================================
   RESOURCE CARDS
   ============================================ */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.resource-card {
    background: var(--lib-bg-card);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
    display: flex;
    flex-direction: column;
    position: relative;
}

.resource-card.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.resource-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.resource-card:hover .resource-cover-img {
    transform: scale(1.03);
}

.resource-cover {
    position: relative;
    display: flex;
    justify-content: center;
    padding: 20px 20px 16px;
    background: linear-gradient(180deg, var(--lib-bg-tertiary) 0%, var(--lib-bg-secondary) 100%);
    text-decoration: none;
}

.resource-cover-img {
    width: 160px;
    height: 220px;
    border-radius: 6px;
    overflow: hidden;
    background: linear-gradient(145deg, var(--lib-primary) 0%, var(--lib-primary-dark) 100%);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18),
                0 2px 8px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
    position: relative;
}

.resource-cover-img::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to right, rgba(255,255,255,0.1) 0%, transparent 5%, transparent 95%, rgba(0,0,0,0.1) 100%);
    pointer-events: none;
}

.resource-cover-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.resource-cover-placeholder {
    font-size: 42px;
    color: rgba(255, 255, 255, 0.2);
}

.resource-type-badge {
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 10px;
    background: var(--lib-bg-card);
    border-radius: 20px;
    color: var(--lib-text-secondary);
    font-size: 10px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    white-space: nowrap;
}

.resource-type-badge i {
    color: var(--lib-primary);
    font-size: 10px;
}

.featured-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 8px;
    background: linear-gradient(135deg, var(--lib-accent) 0%, #e5b820 100%);
    border-radius: 4px;
    color: var(--lib-primary-dark);
    font-size: 9px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 6px rgba(201, 162, 39, 0.4);
}

.resource-content {
    padding: 16px 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
    text-align: center;
}

.resource-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--lib-text-primary);
    margin-bottom: 6px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color 0.2s ease;
}

.resource-card:hover .resource-title {
    color: var(--lib-primary);
}

.resource-author {
    font-size: 12px;
    color: var(--lib-text-light);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.resource-author i {
    font-size: 10px;
    color: var(--lib-text-light);
}

.resource-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    font-size: 11px;
    color: var(--lib-text-light);
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--lib-border-light);
}

.resource-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.resource-meta i {
    font-size: 10px;
    color: var(--lib-text-light);
}

.resource-actions {
    padding: 0 20px 20px;
}

.resource-btn {
    width: 100%;
    padding: 10px 16px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.resource-btn-primary {
    background: var(--lib-primary);
    color: var(--lib-text-inverse);
}

.resource-btn-primary:hover {
    background: var(--lib-primary-light);
    box-shadow: 0 4px 12px rgba(30, 58, 95, 0.25);
}

.resource-btn-secondary {
    background: transparent;
    color: var(--lib-primary);
    border: 1px solid var(--lib-border);
}

.resource-btn-secondary:hover {
    border-color: var(--lib-primary);
    background: rgba(30, 58, 95, 0.05);
}

/* ============================================
   FEATURED SECTION
   ============================================ */
.featured-section {
    background: var(--lib-bg-card);
    border-radius: 24px;
    padding: 40px;
    margin-bottom: 50px;
    border: 1px solid var(--lib-border);
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.featured-item {
    display: flex;
    gap: 20px;
    padding: 20px;
    background: var(--lib-bg-tertiary);
    border-radius: 16px;
    transition: var(--lib-transition);
}

.featured-item:hover {
    background: var(--lib-bg-secondary);
    transform: translateX(5px);
}

.featured-cover {
    width: 108px;
    height: 150px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--lib-primary) 0%, var(--lib-primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
}

.featured-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.featured-cover i {
    font-size: 32px;
    color: rgba(255, 255, 255, 0.4);
}

.featured-info {
    flex: 1;
}

.featured-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--lib-text-primary);
    margin-bottom: 6px;
}

.featured-author {
    font-size: 13px;
    color: var(--lib-text-secondary);
    margin-bottom: 10px;
}

.featured-desc {
    font-size: 13px;
    color: var(--lib-text-light);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
}

.featured-stats {
    display: flex;
    gap: 15px;
    font-size: 12px;
    color: var(--lib-text-light);
}

.featured-stats span {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* ============================================
   SINGLE ITEM VIEW
   ============================================ */
.item-detail {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 50px;
    margin-bottom: 50px;
}

.item-cover-section {
    position: sticky;
    top: calc(var(--lib-header-height) + var(--lib-nav-height) + 30px);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.item-cover {
    width: 217px;
    height: 300px;
    border-radius: 12px;
    background: linear-gradient(145deg, var(--lib-primary) 0%, var(--lib-primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2),
                0 5px 15px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    position: relative;
}

.item-cover::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to right, rgba(255,255,255,0.1) 0%, transparent 5%, transparent 95%, rgba(0,0,0,0.1) 100%);
    pointer-events: none;
}

.item-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.item-cover i {
    font-size: 80px;
    color: rgba(255, 255, 255, 0.3);
}

.item-download-btn {
    width: 217px;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--lib-primary) 0%, var(--lib-primary-light) 100%);
    color: var(--lib-text-inverse);
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: var(--lib-transition);
    margin-bottom: 15px;
}

.item-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--lib-shadow-md);
}

.item-secondary-btn {
    width: 217px;
    padding: 12px 24px;
    background: var(--lib-bg-tertiary);
    color: var(--lib-text-primary);
    border: 1px solid var(--lib-border);
    border-radius: 10px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--lib-transition);
}

.item-secondary-btn:hover {
    border-color: var(--lib-primary);
    color: var(--lib-primary);
}

.item-info-section h1 {
    font-family: var(--lib-font-display);
    font-size: 32px;
    font-weight: 700;
    color: var(--lib-text-primary);
    margin-bottom: 15px;
    line-height: 1.3;
}

.item-type-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--lib-bg-tertiary);
    border-radius: 50px;
    font-size: 14px;
    color: var(--lib-text-secondary);
    margin-bottom: 20px;
}

/* Metadata & tags below cover (view page) */
.item-cover-meta {
    width: 217px;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--lib-border);
}

.item-cover-meta .item-meta-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-bottom: 20px;
    padding: 0;
    background: transparent;
    border-radius: 0;
}

.item-cover-meta .item-meta-item {
    display: flex;
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--lib-border-light);
}

.item-cover-meta .item-meta-item:last-of-type {
    border-bottom: none;
}

.item-cover-meta .item-meta-label {
    font-size: 12px;
    color: var(--lib-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

.item-cover-meta .item-meta-value {
    font-size: 14px;
    color: var(--lib-text-primary);
    font-weight: 500;
    text-align: right;
    word-break: break-word;
}

.item-cover-meta .item-meta-link:hover {
    text-decoration: underline;
}

.item-tags-block {
    padding: 20px 0 0;
    border-top: 1px solid var(--lib-border);
}

.item-tags-heading {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 600;
    color: var(--lib-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.item-tags-heading i {
    color: var(--lib-primary);
}

.item-cover-meta .item-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.item-cover-meta .item-tag {
    padding: 6px 14px;
    background: var(--lib-bg-tertiary);
    border-radius: 20px;
    font-size: 13px;
    color: var(--lib-text-secondary);
    transition: var(--lib-transition);
    border: 1px solid var(--lib-border);
}

.item-cover-meta .item-tag:hover {
    background: var(--lib-primary);
    color: var(--lib-text-inverse);
    border-color: var(--lib-primary);
}

.item-meta-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 30px;
    padding: 25px;
    background: var(--lib-bg-tertiary);
    border-radius: 16px;
}

.item-meta-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.item-meta-label {
    font-size: 12px;
    color: var(--lib-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.item-meta-value {
    font-size: 15px;
    color: var(--lib-text-primary);
    font-weight: 500;
}

.item-description {
    margin-bottom: 30px;
}

.item-description h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--lib-text-primary);
    margin-bottom: 15px;
}

.item-description p,
.item-description-content p {
    color: var(--lib-text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}

.item-description-content {
    color: var(--lib-text-secondary);
    line-height: 1.8;
}

.item-description-content h1,
.item-description-content h2,
.item-description-content h3,
.item-description-content h4 {
    color: var(--lib-text-primary);
    margin: 20px 0 12px;
    font-weight: 600;
}

.item-description-content h1 { font-size: 22px; }
.item-description-content h2 { font-size: 18px; }
.item-description-content h3 { font-size: 16px; }
.item-description-content h4 { font-size: 14px; }

.item-description-content ul,
.item-description-content ol {
    margin: 12px 0;
    padding-left: 24px;
}

.item-description-content li {
    margin-bottom: 6px;
}

.item-description-content a {
    color: var(--lib-primary);
}

.item-description-content a:hover {
    text-decoration: underline;
}

.item-description-content blockquote {
    border-left: 4px solid var(--lib-primary);
    padding-left: 16px;
    margin: 16px 0;
    color: var(--lib-text-light);
}

/* Tags section - below description */
.item-tags-section {
    margin-top: 32px;
    padding-top: 28px;
    border-top: 1px solid var(--lib-border);
}

.item-tags-section .item-tags-heading {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
    color: var(--lib-text-primary);
    margin: 0 0 16px;
    text-transform: none;
    letter-spacing: 0;
}

.item-tags-section .item-tags-heading i {
    color: var(--lib-primary);
}

.item-tags-section .item-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.item-tags-section .item-tag {
    display: inline-flex;
    align-items: center;
    padding: 8px 18px;
    background: var(--lib-bg-tertiary);
    border: 1px solid var(--lib-border);
    border-radius: 24px;
    font-size: 14px;
    font-weight: 500;
    color: var(--lib-text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
}

.item-tags-section .item-tag:hover {
    background: var(--lib-primary);
    color: var(--lib-text-inverse);
    border-color: var(--lib-primary);
}

.item-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.item-tag {
    padding: 6px 14px;
    background: var(--lib-bg-tertiary);
    border-radius: 20px;
    font-size: 13px;
    color: var(--lib-text-secondary);
    transition: var(--lib-transition);
}

.item-tag:hover {
    background: var(--lib-primary);
    color: var(--lib-text-inverse);
}

/* ============================================
   FILTERS & SIDEBAR
   ============================================ */
.browse-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 40px;
}

.filters-sidebar {
    position: sticky;
    top: calc(var(--lib-header-height) + var(--lib-nav-height) + 30px);
    height: fit-content;
}

.filter-card {
    background: var(--lib-bg-card);
    border-radius: 16px;
    padding: 25px;
    margin-bottom: 20px;
    border: 1px solid var(--lib-border);
}

.filter-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--lib-text-primary);
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--lib-border);
}

.filter-list {
    list-style: none;
}

.filter-list li {
    margin-bottom: 12px;
}

.filter-list a,
.filter-list label {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    color: var(--lib-text-secondary);
    border-radius: 8px;
    transition: var(--lib-transition);
    cursor: pointer;
}

.filter-list a:hover,
.filter-list label:hover {
    background: var(--lib-bg-tertiary);
    color: var(--lib-text-primary);
}

.filter-list a.active {
    background: var(--lib-primary);
    color: var(--lib-text-inverse);
}

.filter-list input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--lib-primary);
}

.filter-count {
    margin-left: auto;
    font-size: 12px;
    padding: 2px 8px;
    background: var(--lib-bg-tertiary);
    border-radius: 10px;
}

/* ============================================
   PAGINATION
   ============================================ */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 40px;
}

.pagination a,
.pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    background: var(--lib-bg-card);
    border: 1px solid var(--lib-border);
    border-radius: 8px;
    color: var(--lib-text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: var(--lib-transition);
}

.pagination a:hover {
    background: var(--lib-primary);
    color: var(--lib-text-inverse);
    border-color: var(--lib-primary);
}

.pagination .active {
    background: var(--lib-primary);
    color: var(--lib-text-inverse);
    border-color: var(--lib-primary);
}

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

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
    text-align: center;
    padding: 80px 40px;
    background: var(--lib-bg-card);
    border-radius: 24px;
    border: 2px dashed var(--lib-border);
}

.empty-state-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto 25px;
    background: var(--lib-bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: var(--lib-text-light);
}

.empty-state h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--lib-text-primary);
    margin-bottom: 10px;
}

.empty-state p {
    color: var(--lib-text-secondary);
    max-width: 400px;
    margin: 0 auto;
}

/* ============================================
   FOOTER
   ============================================ */
.library-footer {
    background: var(--lib-primary-dark);
    padding: 60px 0 30px;
    margin-top: 60px;
}

.footer-container {
    max-width: var(--lib-container-width);
    margin: 0 auto;
    padding: 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 50px;
    margin-bottom: 50px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 22px;
    font-weight: 700;
    color: var(--lib-text-inverse);
    margin-bottom: 20px;
}

.footer-logo i {
    color: var(--lib-accent);
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 25px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--lib-text-inverse);
    transition: var(--lib-transition);
}

.social-link:hover {
    background: var(--lib-accent);
    color: var(--lib-primary-dark);
    transform: translateY(-3px);
}

.footer-links h4,
.footer-contact h4 {
    color: var(--lib-text-inverse);
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    transition: var(--lib-transition);
}

.footer-links a:hover {
    color: var(--lib-accent);
    padding-left: 5px;
}

.contact-list {
    list-style: none;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.contact-list i {
    color: var(--lib-accent);
    width: 20px;
}

.contact-list a {
    color: rgba(255, 255, 255, 0.7);
}

.contact-list a:hover {
    color: var(--lib-accent);
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

.footer-bottom a {
    color: var(--lib-accent);
}

.footer-bottom a:hover {
    text-decoration: underline;
}

/* ============================================
   MOBILE OVERLAY
   ============================================ */
.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: var(--lib-transition);
}

.mobile-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.5s ease forwards;
}

/* Stagger animation for grid items */
.resources-grid .resource-card:nth-child(1) { animation-delay: 0.1s; }
.resources-grid .resource-card:nth-child(2) { animation-delay: 0.15s; }
.resources-grid .resource-card:nth-child(3) { animation-delay: 0.2s; }
.resources-grid .resource-card:nth-child(4) { animation-delay: 0.25s; }
.resources-grid .resource-card:nth-child(5) { animation-delay: 0.3s; }
.resources-grid .resource-card:nth-child(6) { animation-delay: 0.35s; }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1200px) {
    .hero-section {
        padding: 40px;
    }
    
    .hero-title {
        font-size: 34px;
    }
    
    .item-detail {
        grid-template-columns: 280px 1fr;
        gap: 30px;
    }
    
    .browse-layout {
        grid-template-columns: 250px 1fr;
        gap: 30px;
    }
}

@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
    
    .nav-stats {
        display: none;
    }
    
    .browse-layout {
        grid-template-columns: 1fr;
    }
    
    .filters-sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 20px;
    }
    
    .filter-card {
        margin-bottom: 0;
    }
}

@media (max-width: 768px) {
    .library-topbar {
        display: none;
    }
    
    .header-container {
        padding: 0 20px;
        gap: 15px;
    }
    
    .brand-text {
        display: none;
    }
    
    .header-search {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .library-nav {
        height: auto;
    }
    
    .nav-container {
        flex-direction: column;
        padding: 0;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--lib-header-height);
        left: 0;
        width: 280px;
        height: calc(100vh - var(--lib-header-height));
        background: var(--lib-bg-primary);
        flex-direction: column;
        align-items: stretch;
        padding: 20px;
        transform: translateX(-100%);
        transition: var(--lib-transition);
        z-index: 999;
        overflow-y: auto;
        gap: 5px;
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-link {
        color: var(--lib-text-primary);
        padding: 12px 15px;
        white-space: normal;
    }
    
    .nav-link.active {
        background: var(--lib-primary);
        color: var(--lib-text-inverse);
    }
    
    /* Show mobile nav items, hide desktop specific */
    .nav-item-mobile {
        display: block;
    }
    
    .nav-item-desktop {
        display: none;
    }
    
    .nav-stats {
        display: none;
    }
    
    .hero-section {
        padding: 30px 20px;
        border-radius: 16px;
    }
    
    .hero-title {
        font-size: 26px;
    }
    
    .hero-subtitle {
        font-size: 15px;
    }
    
    .hero-stats {
        gap: 20px;
    }
    
    .hero-stat-value {
        font-size: 28px;
    }
    
    .section-title {
        font-size: 22px;
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .category-card {
        padding: 20px 15px;
    }
    
    .resources-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: 16px;
    }
    
    .resource-cover {
        padding: 16px 16px 12px;
    }
    
    .resource-cover-img {
        width: 140px;
        height: 190px;
    }
    
    .resource-content {
        padding: 12px 16px;
    }
    
    .resource-actions {
        padding: 0 16px 16px;
    }
    
    .item-detail {
        grid-template-columns: 1fr;
    }
    
    .item-cover-section {
        position: static;
        align-items: center;
    }
    
    .item-cover,
    .item-download-btn,
    .item-secondary-btn,
    .item-cover-meta {
        width: 100%;
        max-width: 280px;
    }
    
    .item-cover {
        height: auto;
        aspect-ratio: 217/300;
        margin: 0 auto 20px;
    }
    
    .item-meta-grid {
        grid-template-columns: 1fr;
    }
    
    .item-cover-meta .item-meta-item {
        flex-wrap: wrap;
    }
    
    .featured-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .page-title {
        font-size: 28px;
    }
    
    .main-container {
        padding: 0 20px;
    }
}

@media (max-width: 480px) {
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 15px;
    }
    
    .brand-icon {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
    
    .action-btn {
        width: 38px;
        height: 38px;
    }
    
    .pagination {
        flex-wrap: wrap;
    }
}

/* Print Styles */
@media print {
    .library-topbar,
    .library-header,
    .library-nav,
    .library-footer,
    .mobile-overlay {
        display: none !important;
    }
    
    .library-main {
        padding: 0;
    }
}