/**
 * VideoTube - Main Stylesheet
 * Dark theme, mobile-first responsive design
 */

/* ===== CSS Variables ===== */
:root {
    --primary: #ff6b00;
    --primary-hover: #ff8533;
    --primary-dark: #cc5500;
    --secondary: #1a1a2e;
    --bg-dark: #0f0f1a;
    --bg-darker: #0a0a12;
    --bg-card: #16162a;
    --bg-card-hover: #1e1e3a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6a6a7a;
    --border-color: #2a2a4a;
    --success: #00c853;
    --danger: #ff3d3d;
    --warning: #ffab00;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: 0.2s ease;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

/* Disable tap highlight on mobile */
a, button, input, select, textarea, 
.video-card, .related-video-item, .nav-link, 
.category-link, .btn, [onclick] {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

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

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

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

button {
    font-family: inherit;
    cursor: pointer;
}

/* ===== Layout Container ===== */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 15px;
}

@media (min-width: 768px) {
    .container {
        padding: 0 20px;
    }
}

/* ===== Header ===== */
.header {
    background: var(--bg-darker);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    gap: 15px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    flex-shrink: 0;
}

.logo img {
    height: 32px;
    width: auto;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Search Bar */
.search-bar {
    flex: 1;
    max-width: 500px;
    position: relative;
}

.search-bar form {
    display: flex;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 25px;
    overflow: hidden;
    transition: border-color var(--transition);
}

.search-bar form:focus-within {
    border-color: var(--primary);
}

.search-bar input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 10px 15px;
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
}

.search-bar input::placeholder {
    color: var(--text-muted);
}

.search-bar button {
    background: var(--primary);
    border: none;
    padding: 10px 18px;
    color: white;
    transition: background var(--transition);
}

.search-bar button:hover {
    background: var(--primary-hover);
}

/* Header Nav */
.header-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition);
}

.nav-link:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.nav-link.active {
    background: var(--primary);
    color: white;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    padding: 5px;
}

/* Desktop Nav & Search */
.search-desktop {
    display: flex;
    
}

.nav-desktop {
    display: flex;
}

/* Mobile Search Bar - Always Visible */
.mobile-search-bar {
    display: none;
    background: var(--bg-darker);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 0;
}

.mobile-search-bar form {
    display: flex;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 25px;
    overflow: hidden;
}

.mobile-search-bar input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 10px 15px;
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
}

.mobile-search-bar input::placeholder {
    color: var(--text-muted);
}

.mobile-search-bar button {
    background: var(--primary);
    border: none;
    padding: 10px 18px;
    color: white;
}

/* ===== Categories Dropdown (Desktop) ===== */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: 0.9rem;
    background: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.nav-dropdown-toggle:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.nav-dropdown-toggle.active {
    background: var(--primary);
    color: white;
}

.dropdown-arrow {
    font-size: 0.7rem;
    transition: transform var(--transition);
}

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

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.2s ease;
    z-index: 1000;
    box-shadow: var(--shadow);
    max-height: 400px;
    overflow-y: auto;
}

.nav-dropdown:hover .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: 10px 16px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition);
}

.dropdown-item:hover {
    background: var(--bg-card-hover);
    color: var(--primary);
}

.dropdown-item-all {
    color: var(--primary);
    font-weight: 500;
}

.dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 8px 0;
}

/* ===== Mobile Sidebar Menu ===== */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 9998;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

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

.mobile-sidebar {
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    max-width: 85vw;
    height: 100vh;
    background: var(--bg-darker);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    transition: right 0.3s ease;
    box-shadow: -5px 0 30px rgba(0, 0, 0, 0.5);
}

.mobile-sidebar.active {
    right: 0;
}

.mobile-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
}

.mobile-sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.mobile-sidebar-logo img {
    height: 28px;
    width: auto;
}

.mobile-sidebar-logo span {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.mobile-sidebar-close {
    background: var(--bg-card);
    border: none;
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all var(--transition);
}

.mobile-sidebar-close:hover {
    background: var(--primary);
    color: white;
}

.mobile-sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 15px 0;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    color: var(--text-secondary);
    font-size: 1rem;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition);
}

.mobile-nav-link i:first-child {
    width: 24px;
    text-align: center;
    font-size: 1.1rem;
}

.mobile-nav-link:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.mobile-nav-link.active {
    background: var(--primary);
    color: white;
}

/* Mobile Accordion */
.mobile-nav-accordion {
    border-bottom: 1px solid var(--border-color);
}

.mobile-accordion-toggle {
    position: relative;
}

.accordion-arrow {
    margin-left: auto;
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.mobile-nav-accordion.open .accordion-arrow {
    transform: rotate(180deg);
}

.mobile-accordion-content {
    display: none;
    background: var(--bg-card);
    padding: 5px 0;
}

.mobile-nav-accordion.open .mobile-accordion-content {
    display: block;
}

.mobile-sub-link {
    display: block;
    padding: 12px 20px 12px 56px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: all var(--transition);
}

.mobile-sub-link:hover {
    color: var(--primary);
    background: var(--bg-card-hover);
}

.mobile-sub-link i {
    margin-right: 8px;
}

.mobile-sidebar-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.mobile-sidebar-footer p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Body no scroll when sidebar open */
body.menu-open {
    overflow: hidden;
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    .search-desktop {
        display: none;
    }
    
    .nav-desktop {
        display: none;
    }
    
    .mobile-search-bar {
        display: block;
    }
    
    .categories-bar {
        display: none;
    }
}

/* ===== Categories Bar ===== */
.categories-bar {
    background: var(--bg-darker);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.categories-bar::-webkit-scrollbar {
    display: none;
}

.categories-list {
    display: flex;
    gap: 5px;
    padding: 10px 0;
    white-space: nowrap;
}

.category-link {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    background: var(--bg-card);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.category-link:hover,
.category-link.active {
    background: var(--primary);
    color: white;
}

/* ===== Main Content ===== */
.main-content {
    padding: 20px 0;
    min-height: calc(100vh - 200px);
}

/* Section Titles */
.section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

.section-title h2 {
    font-size: 1.3rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title h2 .icon {
    color: var(--primary);
}

.section-title .view-all {
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 500;
}

/* ===== Video Grid ===== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

@media (min-width: 576px) {
    .video-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 768px) {
    .video-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }
}

@media (min-width: 1024px) {
    .video-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

@media (min-width: 1200px) {
    .video-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

/* Video Card */
.video-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    background: var(--bg-card-hover);
}

.video-card:hover .video-thumb img {
    transform: scale(1.05);
}

.video-thumb {
    position: relative;
    padding-top: 56.25%;
    overflow: hidden;
    background: var(--bg-darker);
}

.video-thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.video-thumb img.lazy {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-thumb img.lazy.loaded {
    opacity: 1;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.85);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.video-info {
    padding: 12px;
}

.video-title {
    font-size: 0.9rem;
    font-weight: 500;
    line-height: 1.4;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

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

.video-category {
    display: inline-block;
    margin-top: 8px;
    padding: 3px 8px;
    background: var(--secondary);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ===== Video Player Page ===== */
.video-player-section {
    margin-bottom: 30px;
}

.video-player-container {
    position: relative;
    padding-top: 56.25%;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.video-player-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-details {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    margin-top: 15px;
}

.video-details h1 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.video-stats {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 15px;
}

.video-stats .stat {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.video-stats .stat .icon {
    color: var(--primary);
}

.video-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.video-actions .btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    border: none;
    transition: all var(--transition);
}

.btn-like {
    background: var(--success);
    color: white;
}

.btn-dislike {
    background: var(--bg-darker);
    color: var(--text-secondary);
    border: 1px solid var(--border-color) !important;
}

.video-description {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.video-description h3 {
    font-size: 1rem;
    margin-bottom: 10px;
}

.video-description p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Video Tags */
.video-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

.video-tags a {
    display: inline-block;
    padding: 5px 12px;
    background: var(--secondary);
    border-radius: 15px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.video-tags a:hover {
    background: var(--primary);
    color: white;
}

/* ===== Sidebar ===== */
/* Video Page Wrapper */
.video-page-wrapper {
    display: flex;
    gap: 20px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 15px;
    justify-content: center;
}

.video-page-wrapper .content-with-sidebar {
    flex: 1;
    max-width: 1200px;
}

.sidebar-left {
    width: 160px;
    flex-shrink: 0;
    display: none;
}

@media (min-width: 1400px) {
    .sidebar-left {
        display: block;
    }
}

.sticky-ad {
    position: sticky;
    top: 100px;
}

.content-with-sidebar {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

@media (min-width: 1024px) {
    .content-with-sidebar {
        grid-template-columns: 1fr 350px;
    }
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.sidebar-widget {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
}

.sidebar-widget h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary);
}

/* Related Videos */
.related-videos {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.related-video-item {
    display: flex;
    gap: 12px;
    padding: 8px;
    background: var(--bg-darker);
    border-radius: var(--radius);
    transition: all var(--transition);
    text-decoration: none;
    color: inherit;
}

.related-video-item:link,
.related-video-item:visited,
.related-video-item:active {
    color: inherit;
    text-decoration: none;
}

.related-video-item:hover {
    background: var(--bg-card-hover);
    color: inherit;
}

.related-video-item .thumb {
    flex-shrink: 0;
    width: 120px;
    height: 68px;
    border-radius: 6px;
    overflow: hidden;
    position: relative;
    background: #000;
}

.related-video-item .thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    background: #000;
}

.related-video-item .info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.related-video-item .info h4 {
    font-size: 0.85rem;
    font-weight: 500;
    line-height: 1.4;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin: 0 0 6px 0;
}

.related-video-item:hover .info h4 {
    color: var(--primary);
}

.related-video-item .info .meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 5px;
}

.related-video-item .info .meta i {
    font-size: 0.7rem;
}

/* Related Video Duration Badge */
.related-duration {
    position: absolute;
    bottom: 4px;
    right: 4px;
    background: rgba(0, 0, 0, 0.85);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 500;
}

/* Ad Banners */
.ad-banner {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px dashed var(--border-color);
}

.ad-banner.header-ad {
    margin-bottom: 20px;
}

.ad-banner.sidebar-ad {
    min-height: 250px;
}

/* ===== Pagination ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 5px;
    margin-top: 40px;
    padding: 20px 0;
}

.pagination a,
.pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    background: var(--bg-card);
    border-radius: var(--radius);
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.pagination a:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.pagination .active {
    background: var(--primary);
    color: white;
}

.pagination .disabled {
    opacity: 0.5;
    pointer-events: none;
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
    padding: 40px 0 20px;
    margin-top: 50px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: repeat(3, 1fr);
    }
}

.footer-section h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary);
}

.footer-section p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ===== Tags Cloud ===== */
.tags-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tags-cloud a {
    padding: 6px 14px;
    background: var(--secondary);
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.tags-cloud a:hover {
    background: var(--primary);
    color: white;
}

/* ===== Search Results ===== */
.search-results-header {
    margin-bottom: 25px;
}

.search-results-header h1 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.search-results-header p {
    color: var(--text-secondary);
}

/* ===== Category Page ===== */
.category-header {
    background: linear-gradient(135deg, var(--bg-card), var(--secondary));
    border-radius: var(--radius-lg);
    padding: 30px;
    margin-bottom: 30px;
}

.category-header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.category-header p {
    color: var(--text-secondary);
}

/* ===== No Results ===== */
.no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.no-results .icon {
    font-size: 4rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.no-results h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
}

/* ===== Loading Skeleton ===== */
.skeleton {
    background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-card-hover) 50%, var(--bg-card) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-muted { color: var(--text-muted); }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.hidden { display: none; }

/* ===== Print Styles ===== */
@media print {
    .header, .footer, .sidebar, .ad-banner, .pagination {
        display: none;
    }
}