/* ============ COMPLETE EBOOKS LIBRARY CSS ============ */
/* Optimized for 500+ books with Apple-style mobile grid */

:root {
    /* Apple-inspired Color Palette */
    --gray-50: #f5f5f7;
    --gray-100: #e5e5e7;
    --gray-200: #d2d2d7;
    --gray-300: #c7c7cc;
    --gray-400: #aeaeb2;
    --gray-500: #8e8e93;
    --gray-600: #636366;
    --gray-700: #48484a;
    --gray-800: #3a3a3c;
    --gray-900: #1d1d1f;
    
    --blue-50: #f0f7ff;
    --blue-100: #e1effe;
    --blue-500: #007AFF;
    --blue-600: #0056CC;
    --blue-700: #0044A3;
    
    --green-500: #34C759;
    --green-600: #2DA84A;
    --red-500: #FF3B30;
    --orange-500: #FF9500;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-display: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing */
    --space-xxs: 0.25rem;
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height: 64px;
}

/* ============ BASE STYLES ============ */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.5;
    color: var(--gray-900);
    background-color: var(--gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ============ NAVIGATION ============ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: var(--space-sm) 0;
    backdrop-filter: blur(10px);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--gray-900);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.logo-highlight {
    color: var(--blue-500);
}

.nav-actions {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}

.nav-menu-btn,
.nav-search-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-600);
    transition: all var(--transition-normal);
}

.nav-menu-btn:hover,
.nav-search-btn:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.mobile-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: var(--space-md);
    z-index: 999;
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--transition-normal);
}

.mobile-nav:not([hidden]) {
    transform: translateY(0);
    opacity: 1;
}

.mobile-nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.mobile-nav-link {
    display: block;
    padding: var(--space-sm);
    text-decoration: none;
    color: var(--gray-600);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background: var(--blue-50);
    color: var(--blue-600);
}

/* ============ SEARCH OVERLAY ============ */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1001;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding-top: 20vh;
}

.search-overlay:not([hidden]) {
    display: flex;
}

.search-form {
    width: 90%;
    max-width: 600px;
}

.search-input-wrapper {
    position: relative;
}

#global-search {
    width: 100%;
    padding: var(--space-lg) var(--space-xl);
    font-size: 1.25rem;
    border-radius: var(--radius-xl);
    border: none;
    background: white;
    box-shadow: var(--shadow-2xl);
}

.search-submit-btn,
.search-close-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray-500);
    padding: var(--space-sm);
}

.search-submit-btn {
    right: var(--space-lg);
}

.search-close-btn {
    right: calc(var(--space-lg) + 40px);
}

/* ============ HERO SECTION ============ */
.hero-section {
    padding: var(--space-2xl) 0;
    text-align: center;
    background: linear-gradient(135deg, var(--blue-50), white);
}

.hero-title {
    font-size: clamp(1.75rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--space-md);
    color: var(--gray-900);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* ============ STATS SECTION ============ */
.stats-section {
    padding: var(--space-xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-md);
}

.stat-card {
    background: white;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--blue-500);
    margin-bottom: var(--space-xs);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ============ CONTROLS SECTION ============ */
.controls-section {
    padding: var(--space-xl) 0;
    background: white;
    border-top: 1px solid var(--gray-200);
    border-bottom: 1px solid var(--gray-200);
}

.controls-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.search-control {
    width: 100%;
}

.search-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

#ebook-search {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    padding-right: 120px;
    font-size: 1rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-xl);
    background: white;
    transition: all var(--transition-normal);
}

#ebook-search:focus {
    outline: none;
    border-color: var(--blue-500);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.search-clear-btn,
.search-action-btn {
    position: absolute;
    right: var(--space-md);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray-500);
    padding: var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-clear-btn {
    right: calc(var(--space-md) + 40px);
}

.filters-control {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.filter-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-xxs);
}

.filter-select {
    padding: var(--space-sm);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    background: white;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.filter-select:focus {
    outline: none;
    border-color: var(--blue-500);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

/* ============ EBOOKS GRID - APPLE BOOKS STYLE ============ */
/* Optimized for 500+ books - 4 columns on mobile, 6 on desktop */

.ebooks-grid {
    --grid-gap: 1rem;
    --grid-min-item-width: 120px; /* Smaller for more columns */
    
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(var(--grid-min-item-width), 1fr));
    gap: var(--grid-gap);
    align-items: start;
}

/* Apple Books Style Grid Items - COMPACT */
.ebook-card.apple-style-grid-item {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--gray-200);
    height: 100%;
}

.ebook-card.apple-style-grid-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--blue-500);
}

/* Compact Cover */
.ebook-cover-container {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.ebook-cover-container .apple-cover {
    aspect-ratio: 2/3;
    background: linear-gradient(135deg, var(--gray-100), var(--gray-200));
    background-size: cover;
    background-position: center;
    transition: transform var(--transition-slow);
    cursor: pointer;
}

.ebook-card.apple-style-grid-item:hover .apple-cover {
    transform: scale(1.05);
}

/* Featured Badge */
.featured-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: linear-gradient(135deg, var(--red-500), #ff6b6b);
    color: white;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.3px;
    text-transform: uppercase;
    box-shadow: 0 2px 8px rgba(255, 59, 48, 0.3);
    z-index: 2;
}

/* Cover Overlay */
.cover-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.ebook-cover-container:hover .cover-overlay {
    opacity: 1;
}

.cover-hint {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Compact Content */
.ebook-content.apple-content {
    padding: var(--space-sm);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

/* Compact Title */
.ebook-title.apple-title {
    font-size: 0.8125rem;
    font-weight: 600;
    line-height: 1.3;
    margin: 0;
    color: var(--gray-900);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.2rem;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.ebook-title.apple-title:hover {
    color: var(--blue-500);
}

/* Compact Author */
.ebook-author.apple-author {
    font-size: 0.75rem;
    color: var(--gray-600);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-weight: 500;
}

/* Compact Meta */
.ebook-meta.apple-meta {
    display: flex;
    gap: 4px;
    margin-top: 4px;
    flex-wrap: wrap;
}

.ebook-category.apple-category,
.ebook-duration.apple-duration {
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.625rem;
    font-weight: 600;
    letter-spacing: 0.2px;
}

.ebook-category.apple-category {
    background: rgba(52, 199, 89, 0.1);
    color: var(--green-500);
    border: 1px solid rgba(52, 199, 89, 0.2);
}

.ebook-duration.apple-duration {
    background: rgba(0, 122, 255, 0.1);
    color: var(--blue-500);
    border: 1px solid rgba(0, 122, 255, 0.2);
}

/* Compact Stats */
.ebook-stats.apple-stats {
    margin-top: auto;
    padding-top: 8px;
    border-top: 1px solid var(--gray-200);
}

.ebook-stats.apple-stats .download-count {
    font-size: 0.6875rem;
    color: var(--gray-500);
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 500;
}

/* Compact Read Button */
.btn-read.apple-read-btn {
    width: 100%;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    background: linear-gradient(135deg, var(--green-500), var(--green-600));
    color: white;
    margin-top: 8px;
    min-height: 36px;
}

.btn-read.apple-read-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(52, 199, 89, 0.3);
    background: linear-gradient(135deg, var(--green-600), #1F8A3A);
}

.btn-read.apple-read-btn svg {
    width: 14px;
    height: 14px;
}

/* ============ LIST VIEW ============ */
.ebook-card.apple-list-item {
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    display: none;
    padding: var(--space-md);
    gap: var(--space-md);
    align-items: center;
}

.ebooks-grid.list-view .ebook-card.apple-list-item {
    display: grid;
    grid-template-columns: auto 1fr;
}

.ebook-card.apple-list-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--blue-500);
}

/* List View Cover */
.ebook-card.apple-list-item .list-cover {
    width: 60px;
    height: 90px;
    border-radius: var(--radius-md);
    background-size: cover;
    background-position: center;
    flex-shrink: 0;
    cursor: pointer;
    transition: transform var(--transition-normal);
}

.ebook-card.apple-list-item:hover .list-cover {
    transform: scale(1.05);
}

/* List Content */
.ebook-card.apple-list-item .list-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ebook-card.apple-list-item .list-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-900);
    margin: 0;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.ebook-card.apple-list-item .list-title:hover {
    color: var(--blue-500);
}

.ebook-card.apple-list-item .list-author {
    font-size: 0.8125rem;
    color: var(--gray-600);
    margin: 0;
    font-weight: 500;
}

.ebook-card.apple-list-item .list-description {
    font-size: 0.8125rem;
    color: var(--gray-600);
    line-height: 1.4;
    margin: 4px 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* List Actions */
.ebook-card.apple-list-item .list-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-top: 8px;
}

.btn-read-list {
    padding: 6px 12px;
    background: linear-gradient(135deg, var(--green-500), var(--green-600));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 4px;
}

.btn-read-list:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(52, 199, 89, 0.3);
}

.btn-share-list {
    padding: 6px 12px;
    background: rgba(0, 122, 255, 0.1);
    color: var(--blue-500);
    border: 1px solid rgba(0, 122, 255, 0.2);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 4px;
}

.btn-share-list:hover {
    background: rgba(0, 122, 255, 0.2);
}

/* ============ VIEW CONTROLS ============ */
.view-controls {
    display: inline-flex;
    gap: 2px;
    background: var(--gray-100);
    padding: 4px;
    border-radius: var(--radius-lg);
}

.view-btn {
    padding: 8px 16px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--gray-600);
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-normal);
}

.view-btn:hover {
    background: rgba(255, 255, 255, 0.5);
}

.view-btn.active {
    background: white;
    color: var(--blue-500);
    box-shadow: var(--shadow-sm);
}

/* ============ FEATURED & CATEGORIES ============ */
.featured-section,
.categories-section,
.all-ebooks-section {
    padding: var(--space-xl) 0;
}

.section-header {
    margin-bottom: var(--space-lg);
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-xs);
}

.section-subtitle {
    color: var(--gray-600);
    font-size: 1rem;
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.category-card {
    background: white;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--gray-200);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: var(--blue-500);
    box-shadow: var(--shadow-lg);
}

/* ============ LOAD MORE ============ */
.load-more-container {
    text-align: center;
    margin-top: var(--space-xl);
    padding: var(--space-lg) 0;
}

#load-more-btn {
    padding: var(--space-md) var(--space-xl);
    background: var(--blue-500);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

#load-more-btn:hover {
    background: var(--blue-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.remaining-count {
    display: block;
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: var(--space-xs);
}

/* ============ NO RESULTS ============ */
#no-results {
    text-align: center;
    padding: var(--space-2xl) var(--space-md);
    color: var(--gray-500);
}

.no-results-icon {
    margin-bottom: var(--space-md);
    color: var(--gray-400);
    opacity: 0.5;
}

.no-results-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--gray-700);
}

.no-results-text {
    margin-bottom: var(--space-lg);
    font-size: 1rem;
}

#clear-search-btn {
    padding: var(--space-sm) var(--space-lg);
    background: var(--blue-500);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

#clear-search-btn:hover {
    background: var(--blue-600);
    transform: translateY(-1px);
}

/* ============ RESULTS COUNT ============ */
.results-count {
    font-size: 1rem;
    color: var(--gray-600);
    font-weight: 500;
}

#ebooks-count {
    font-weight: 700;
    color: var(--blue-500);
}

/* ============ RESPONSIVE DESIGN - APPLE BOOKS STYLE ============ */
/* Ultra Compact Mobile Grid - 4 columns on small phones */
@media (max-width: 360px) {
    .ebooks-grid {
        --grid-gap: 0.75rem;
        --grid-min-item-width: 80px; /* Even smaller for 4 columns */
        grid-template-columns: repeat(4, 1fr);
    }
    
    .ebook-card.apple-style-grid-item {
        border-radius: var(--radius-md);
    }
    
    .ebook-content.apple-content {
        padding: 8px;
    }
    
    .ebook-title.apple-title {
        font-size: 0.75rem;
        min-height: 1.8rem;
    }
    
    .ebook-author.apple-author {
        font-size: 0.6875rem;
    }
    
    .btn-read.apple-read-btn {
        padding: 6px 8px;
        font-size: 0.6875rem;
        min-height: 32px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Standard Mobile - 3 columns */
@media (min-width: 361px) and (max-width: 480px) {
    .ebooks-grid {
        --grid-gap: 0.875rem;
        --grid-min-item-width: 100px;
        grid-template-columns: repeat(3, 1fr);
    }
    
    .ebook-card.apple-style-grid-item {
        border-radius: var(--radius-lg);
    }
    
    .ebook-content.apple-content {
        padding: 10px;
    }
    
    .ebook-title.apple-title {
        font-size: 0.8125rem;
    }
    
    .ebooks-grid.list-view .ebook-card.apple-list-item {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .ebook-card.apple-list-item .list-cover {
        width: 80px;
        height: 120px;
        margin: 0 auto;
    }
    
    .ebook-card.apple-list-item .list-actions {
        justify-content: center;
    }
}

/* Large Mobile - 4 columns */
@media (min-width: 481px) and (max-width: 767px) {
    .ebooks-grid {
        --grid-gap: 1rem;
        --grid-min-item-width: 110px;
        grid-template-columns: repeat(4, 1fr);
    }
    
    .filters-control {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Tablet - 5 columns */
@media (min-width: 768px) and (max-width: 1023px) {
    .ebooks-grid {
        --grid-gap: 1rem;
        --grid-min-item-width: 140px;
        grid-template-columns: repeat(5, 1fr);
    }
    
    .filters-control {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Desktop - 6 columns */
@media (min-width: 1024px) {
    .ebooks-grid {
        --grid-gap: 1.25rem;
        --grid-min-item-width: 150px;
        grid-template-columns: repeat(6, 1fr);
    }
    
    .ebook-title.apple-title {
        font-size: 0.875rem;
    }
    
    .ebook-author.apple-author {
        font-size: 0.8125rem;
    }
}

/* Large Desktop - 7 columns */
@media (min-width: 1440px) {
    .ebooks-grid {
        grid-template-columns: repeat(7, 1fr);
    }
}

/* ============ DARK MODE ============ */
@media (prefers-color-scheme: dark) {
    body {
        background: var(--gray-900);
        color: var(--gray-100);
    }
    
    .site-header {
        background: var(--gray-900);
        border-color: var(--gray-800);
    }
    
    .nav-logo {
        color: var(--gray-100);
    }
    
    .nav-menu-btn,
    .nav-search-btn {
        color: var(--gray-400);
    }
    
    .nav-menu-btn:hover,
    .nav-search-btn:hover {
        background: var(--gray-800);
        color: var(--gray-100);
    }
    
    .mobile-nav {
        background: var(--gray-900);
        border-color: var(--gray-800);
    }
    
    .hero-section {
        background: linear-gradient(135deg, var(--gray-800), var(--gray-900));
    }
    
    .stat-card,
    .category-card,
    .ebook-card.apple-style-grid-item,
    .ebook-card.apple-list-item {
        background: var(--gray-800);
        border-color: var(--gray-700);
        color: var(--gray-100);
    }
    
    .stat-number {
        color: #64d2ff;
    }
    
    .ebook-title.apple-title,
    .list-title {
        color: var(--gray-100);
    }
    
    .ebook-title.apple-title:hover,
    .list-title:hover {
        color: #64d2ff;
    }
    
    .ebook-author.apple-author,
    .list-author,
    .ebook-description,
    .list-description {
        color: var(--gray-400);
    }
    
    .ebook-cover-container .apple-cover {
        background: linear-gradient(135deg, var(--gray-700), var(--gray-800));
    }
    
    #ebook-search,
    .filter-select,
    #global-search {
        background: var(--gray-800);
        border-color: var(--gray-700);
        color: var(--gray-100);
    }
    
    #ebook-search:focus,
    .filter-select:focus {
        border-color: #64d2ff;
    }
    
    .view-controls {
        background: var(--gray-800);
    }
    
    .view-btn.active {
        background: var(--gray-700);
        color: #64d2ff;
    }
    
    .ebook-stats.apple-stats {
        border-color: var(--gray-700);
    }
    
    .download-count {
        color: var(--gray-500);
    }
}

/* ============ ACCESSIBILITY ============ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--blue-500);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============ UTILITY CLASSES ============ */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }
.mt-5 { margin-top: var(--space-xl); }

.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }
.mb-5 { margin-bottom: var(--space-xl); }

.hidden {
    display: none !important;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-1 { gap: var(--space-xs); }
.gap-2 { gap: var(--space-sm); }
.gap-3 { gap: var(--space-md); }
.gap-4 { gap: var(--space-lg); }
.gap-5 { gap: var(--space-xl); }