/* 
 * TrendTube - Comprehensive Styles
 * Includes responsive navbar, footer, mobile optimization, and theme support
 */

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

:root {
    --primary-color: #FF0000;
    --primary-dark: #CC0000;
    --primary-light: #ff4444;
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #272727;
    --bg-hover: #3d3d3d;
    --text-primary: #ffffff;
    --text-secondary: #aaaaaa;
    --text-muted: #717171;
    --border-color: #303030;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --transition: all 0.3s ease;
    --header-height: 64px;
    --nav-width: 280px;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f9f9f9;
    --bg-tertiary: #f1f1f1;
    --bg-hover: #e5e5e5;
    --text-primary: #0f0f0f;
    --text-secondary: #606060;
    --text-muted: #909090;
    --border-color: #e0e0e0;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

body.menu-open { overflow: hidden; }

/* Header */
.header {
    background: var(--bg-secondary);
    padding: 12px 20px;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.header-container {
    max-width: 1800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.logo:hover { opacity: 0.9; }

.youtube-icon { width: 36px; height: 25px; }

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: var(--transition);
}

.mobile-menu-toggle:hover { background: var(--bg-hover); }

.hamburger-line {
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    margin: 2px 0;
    transition: var(--transition);
    border-radius: 2px;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) { opacity: 0; }

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Navigation */
.main-nav { display: flex; align-items: center; }

.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 4px;
}

.nav-item { position: relative; }

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
    white-space: nowrap;
}

.nav-link:hover { background: var(--bg-hover); }
.nav-link.active { background: var(--bg-tertiary); color: var(--primary-color); }
.nav-link svg { width: 20px; height: 20px; fill: currentColor; }

.submenu-arrow {
    width: 18px !important;
    height: 18px !important;
    margin-left: -4px;
    transition: var(--transition);
}

.has-submenu.open .submenu-arrow { transform: rotate(180deg); }

.submenu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    list-style: none;
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 100;
}

.has-submenu.open .submenu,
.has-submenu:hover .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.submenu li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    border-radius: 8px;
    transition: var(--transition);
}

.submenu li a:hover { background: var(--bg-hover); color: var(--primary-color); }
.submenu li a svg { width: 18px; height: 18px; fill: currentColor; }

/* Search */
.search-container {
    flex: 1;
    max-width: 500px;
    display: flex;
    align-items: center;
}

.search-container input {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: 40px 0 0 40px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    transition: var(--transition);
    min-width: 0;
}

.search-container input:focus { border-color: #1c62b9; }
.search-container input::placeholder { color: var(--text-muted); }

.search-btn {
    padding: 10px 20px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 40px 40px 0;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-btn:hover { background: var(--bg-hover); }
.search-icon { width: 22px; height: 22px; fill: var(--text-primary); }

.country-selector select {
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    outline: none;
    transition: var(--transition);
}

.country-selector select:hover { background: var(--bg-hover); }
.country-selector select:focus { border-color: var(--primary-color); }

.back-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 20px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.back-btn:hover { background: var(--bg-hover); }
.back-btn svg { width: 20px; height: 20px; fill: var(--text-primary); }

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1800px;
    margin: 0 auto;
    padding: 24px 20px;
    width: 100%;
}

.content-header { margin-bottom: 24px; }

.content-header h1 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 500;
    flex-wrap: wrap;
}

.trending-icon { width: 32px; height: 32px; fill: var(--primary-color); flex-shrink: 0; }
#countryName { color: var(--primary-color); }

/* Category Tabs */
.category-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 24px;
    overflow-x: auto;
    padding-bottom: 8px;
    scrollbar-width: thin;
    scrollbar-color: var(--bg-hover) transparent;
    -webkit-overflow-scrolling: touch;
}

.category-tabs::-webkit-scrollbar { height: 6px; }
.category-tabs::-webkit-scrollbar-track { background: transparent; }
.category-tabs::-webkit-scrollbar-thumb { background: var(--bg-hover); border-radius: 3px; }

.tab-btn {
    padding: 10px 18px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
}

.tab-btn:hover { background: var(--bg-hover); }
.tab-btn.active { background: var(--text-primary); color: var(--bg-primary); }

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.video-card {
    background: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    animation: fadeInUp 0.4s ease forwards;
    opacity: 0;
}

.video-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.video-card:hover .thumbnail img { transform: scale(1.05); }
.video-card:hover .play-overlay { opacity: 1; }

.thumbnail {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--bg-tertiary);
}

.thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.play-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: var(--transition);
}

.play-overlay svg {
    width: 60px;
    height: 60px;
    fill: white;
    filter: drop-shadow(0 2px 8px rgba(0,0,0,0.3));
}

.duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.85);
    color: var(--text-primary);
    padding: 3px 6px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.video-info-card { padding: 14px; }

.video-info-card h3 {
    font-size: 15px;
    font-weight: 500;
    line-height: 1.4;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.channel-name { color: var(--text-secondary); font-size: 13px; margin-bottom: 4px; }

.video-meta-card {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 13px;
    flex-wrap: wrap;
}

.video-meta-card span::after { content: '•'; margin-left: 8px; }
.video-meta-card span:last-child::after { content: ''; }

/* Loader */
.loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px;
    gap: 16px;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }
.loader p { color: var(--text-secondary); font-size: 14px; }

.no-results {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    text-align: center;
}

.no-results-icon { width: 80px; height: 80px; fill: var(--text-muted); margin-bottom: 20px; }
.no-results h2 { font-size: 24px; margin-bottom: 8px; }
.no-results p { color: var(--text-secondary); }

/* Watch Page */
.watch-page .main-content { padding: 0; }

.watch-content {
    flex: 1;
    padding: 24px;
    max-width: 1800px;
    margin: 0 auto;
    width: 100%;
}

.watch-container {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 24px;
}

.video-player-section { flex: 1; }

.video-player-wrapper {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.video-player {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-player iframe { width: 100%; height: 100%; border: none; }

.player-loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: white;
}

.player-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    background: var(--bg-secondary);
    padding: 40px;
    text-align: center;
}

.player-error svg { width: 60px; height: 60px; fill: #ff6b6b; margin-bottom: 16px; }
.player-error h3 { margin-bottom: 8px; }
.player-error p { color: var(--text-secondary); font-size: 14px; }

.error-home-btn {
    margin-top: 20px;
    padding: 12px 24px;
    background: var(--primary-color);
    border-radius: 8px;
    color: white;
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

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

.video-actions { display: flex; gap: 12px; margin-top: 16px; flex-wrap: wrap; }

.action-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 20px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.action-btn:hover { background: var(--bg-hover); }
.action-btn svg { width: 20px; height: 20px; fill: currentColor; }
.youtube-btn:hover { background: var(--primary-color); color: white; }
.youtube-btn:hover svg { fill: white; }

.video-info { padding: 20px 0; }

.video-title {
    font-size: 22px;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 16px;
}

.video-meta {
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 16px;
}

.video-stats { display: flex; flex-wrap: wrap; gap: 20px; }

.stat {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 14px;
}

.stat svg { width: 20px; height: 20px; fill: var(--text-secondary); }

.channel-info {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
}

.channel-thumbnail {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex-shrink: 0;
}

.channel-thumbnail img { width: 100%; height: 100%; object-fit: cover; }
.channel-thumbnail svg { width: 32px; height: 32px; fill: var(--text-muted); }
.channel-details h3 { font-size: 16px; font-weight: 500; margin-bottom: 4px; }
.channel-details p { color: var(--text-muted); font-size: 13px; }

.video-description { padding: 16px 0; }
.video-description h4 { font-size: 14px; font-weight: 500; margin-bottom: 12px; color: var(--text-secondary); }

.description-content {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    max-height: 100px;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.description-content.expanded { max-height: none; }
.description-content a { color: #4dabf7; text-decoration: none; }
.description-content a:hover { text-decoration: underline; }
.description-content .timestamp { color: var(--primary-color); font-weight: 500; }

.show-more-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    padding: 8px 0;
    transition: var(--transition);
}

.show-more-btn:hover { color: var(--text-primary); }

.video-tags { padding: 16px 0; border-top: 1px solid var(--border-color); }
.tags-container { display: flex; flex-wrap: wrap; gap: 8px; }

.tag {
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border-radius: 16px;
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.tag:hover { background: var(--bg-hover); color: var(--primary-color); }

.related-videos-section { position: sticky; top: 80px; height: fit-content; }

.related-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 20px;
}

.related-title svg { width: 24px; height: 24px; fill: var(--primary-color); }

.related-videos-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: calc(100vh - 180px);
    overflow-y: auto;
    padding-right: 8px;
}

.related-videos-grid::-webkit-scrollbar { width: 6px; }
.related-videos-grid::-webkit-scrollbar-track { background: transparent; }
.related-videos-grid::-webkit-scrollbar-thumb { background: var(--bg-hover); border-radius: 3px; }

.no-related, .error-related { text-align: center; padding: 20px; color: var(--text-muted); }
.error-related { color: #ff6b6b; }

.related-video-card {
    display: flex;
    gap: 12px;
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.related-video-card:hover { background: var(--bg-tertiary); }
.related-video-card .thumbnail { width: 168px; min-width: 168px; aspect-ratio: 16/9; border-radius: 8px; }
.related-video-card .thumbnail img { border-radius: 8px; }

.related-video-info { flex: 1; display: flex; flex-direction: column; gap: 6px; min-width: 0; }

.related-video-info h4 {
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-video-info .channel-name { font-size: 12px; }
.related-video-info .video-meta-card { font-size: 12px; }

.related-loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    gap: 12px;
}

.related-loader .spinner { width: 32px; height: 32px; }
.related-loader p { font-size: 13px; color: var(--text-muted); }

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 16px;
    max-width: 400px;
    width: 100%;
    overflow: hidden;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 { font-size: 18px; font-weight: 500; }

.modal-close {
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
    border-radius: 50%;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover { background: var(--bg-hover); }
.modal-body { padding: 20px; }

.share-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.share-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 12px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
}

.share-option:hover { background: var(--bg-hover); }
.share-option svg { width: 28px; height: 28px; fill: currentColor; }
.share-url { display: flex; gap: 8px; }

.share-url input {
    flex: 1;
    padding: 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 13px;
    outline: none;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 48px 20px 24px;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.footer-container { max-width: 1800px; margin: 0 auto; }

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 { font-size: 16px; font-weight: 600; margin-bottom: 16px; color: var(--text-primary); }
.footer-logo { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; }
.footer-logo .youtube-icon { width: 32px; height: 22px; }
.footer-logo span { font-size: 20px; font-weight: 700; color: var(--text-primary); }
.footer-description { color: var(--text-secondary); font-size: 14px; line-height: 1.6; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-bottom p { color: var(--text-secondary); font-size: 14px; margin-bottom: 8px; }
.footer-bottom .disclaimer { font-size: 12px; color: var(--text-muted); }
.footer-social { display: flex; justify-content: center; gap: 16px; margin-top: 16px; }

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: 50%;
    transition: var(--transition);
}

.social-link:hover { background: var(--primary-color); }
.social-link svg { width: 20px; height: 20px; fill: var(--text-primary); }

/* Scroll to Top */
.scroll-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 900;
    box-shadow: var(--shadow);
}

.scroll-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.scroll-to-top:hover { background: var(--primary-dark); transform: translateY(-2px); }
.scroll-to-top svg { width: 24px; height: 24px; fill: white; }

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

.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-hover) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

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

/* Responsive - Tablets */
@media (max-width: 1200px) {
    .watch-container { grid-template-columns: 1fr 350px; }
    .related-video-card .thumbnail { width: 140px; min-width: 140px; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
}

@media (max-width: 992px) {
    .watch-container { grid-template-columns: 1fr; }
    .related-videos-section { position: static; }
    .related-videos-grid { max-height: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
    .related-video-card { flex-direction: column; }
    .related-video-card .thumbnail { width: 100%; }
    .mobile-menu-toggle { display: flex; }
    
    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: var(--nav-width);
        height: calc(100vh - var(--header-height));
        background: var(--bg-secondary);
        border-right: 1px solid var(--border-color);
        transform: translateX(-100%);
        transition: var(--transition);
        overflow-y: auto;
        z-index: 999;
    }
    
    .main-nav.active { transform: translateX(0); box-shadow: var(--shadow-lg); }
    .nav-menu { flex-direction: column; align-items: stretch; padding: 16px; gap: 4px; }
    .nav-item { width: 100%; }
    .nav-link { width: 100%; padding: 14px 16px; border-radius: 10px; }
    
    .submenu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        max-height: 0;
        overflow: hidden;
        border: none;
        box-shadow: none;
        padding: 0;
        margin-left: 16px;
        background: transparent;
    }
    
    .has-submenu.open .submenu { max-height: 500px; padding: 8px 0; }
    .submenu li a { padding: 12px 16px; }
    .header-container { gap: 12px; }
    .country-selector { display: none; }
}

/* Mobile */
@media (max-width: 768px) {
    :root { --header-height: 56px; }
    .header { padding: 10px 16px; }
    .header-container { flex-wrap: wrap; gap: 10px; }
    .logo-text { font-size: 18px; }
    .search-container { order: 3; max-width: 100%; width: 100%; }
    .back-btn span { display: none; }
    .back-btn { padding: 10px; border-radius: 50%; }
    .content-header h1 { font-size: 20px; }
    .category-tabs { gap: 8px; margin: 0 -16px 24px; padding: 0 16px 8px; }
    .tab-btn { padding: 8px 14px; font-size: 13px; }
    .video-grid { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
    .watch-content { padding: 16px; }
    .video-title { font-size: 18px; }
    .video-stats { gap: 12px; }
    .stat { font-size: 13px; }
    .video-actions { flex-wrap: wrap; }
    .action-btn { flex: 1; min-width: 120px; justify-content: center; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-section:first-child { text-align: center; }
    .footer-logo { justify-content: center; }
    .main-content { padding: 20px 16px; }
}

/* Small Mobile */
@media (max-width: 480px) {
    .header { padding: 8px 12px; }
    .logo-text { display: none; }
    .youtube-icon { width: 32px; height: 22px; }
    .search-container input { padding: 10px 14px; font-size: 14px; }
    .search-btn { padding: 10px 14px; }
    .main-content { padding: 16px 12px; }
    .content-header h1 { font-size: 18px; }
    .trending-icon { width: 24px; height: 24px; }
    .video-grid { grid-template-columns: 1fr; }
    .video-info-card h3 { font-size: 14px; }
    .watch-content { padding: 12px; }
    .video-title { font-size: 16px; }
    .channel-thumbnail { width: 40px; height: 40px; }
    .channel-details h3 { font-size: 14px; }
    .related-videos-grid { grid-template-columns: 1fr; }
    .modal-content { margin: 12px; }
    .share-options { grid-template-columns: 1fr; }
    .scroll-to-top { bottom: 16px; right: 16px; width: 44px; height: 44px; }
    .footer { padding: 32px 16px 20px; }
    .footer-links a { font-size: 13px; }
}

/* Touch devices */
@media (hover: none) and (pointer: coarse) {
    .video-card:hover { transform: none; }
    .video-card:hover .thumbnail img { transform: none; }
    .video-card:active { transform: scale(0.98); }
    .play-overlay { display: none; }
    .related-video-card:hover { background: transparent; }
    .related-video-card:active { background: var(--bg-tertiary); }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
}