/* ==========================================
   CSS CUSTOM PROPERTIES (Light & Dark Theme)
   ========================================== */
:root {
    /* Primary Colors */
    --primary-start: #667eea;
    --primary-end: #764ba2;
    --primary-gradient: linear-gradient(135deg, var(--primary-start) 0%, var(--primary-end) 100%);
    
    /* Light Theme */
    --bg-primary: #fafafa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f5f7fa;
    --bg-elevated: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #555555;
    --text-tertiary: #888888;
    --text-muted: #aaaaaa;
    --border-color: #e5e7eb;
    --border-hover: #d1d5db;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 35px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.15);
    --overlay-bg: rgba(0, 0, 0, 0.5);
    --card-hover-border: rgba(102, 126, 234, 0.3);
    --nav-bg: rgba(255, 255, 255, 0.95);
    --bottom-nav-bg: rgba(255, 255, 255, 0.98);
    --input-bg: #fafafa;
    --input-focus-bg: #ffffff;
    --tag-bg: rgba(102, 126, 234, 0.1);
    --tag-text: var(--primary-start);
    --badge-local-bg: rgba(102, 126, 234, 0.85);
    --badge-url-bg: rgba(16, 185, 129, 0.85);
    --badge-embed-bg: rgba(245, 158, 11, 0.85);
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --bg-elevated: #1e1e32;
    --text-primary: #e4e4eb;
    --text-secondary: #b0b0c0;
    --text-tertiary: #8888a0;
    --text-muted: #666680;
    --border-color: #2a2a40;
    --border-hover: #3a3a55;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 35px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.6);
    --overlay-bg: rgba(0, 0, 0, 0.7);
    --card-hover-border: rgba(102, 126, 234, 0.4);
    --nav-bg: rgba(26, 26, 46, 0.95);
    --bottom-nav-bg: rgba(26, 26, 46, 0.98);
    --input-bg: #16213e;
    --input-focus-bg: #1a1a2e;
    --tag-bg: rgba(102, 126, 234, 0.2);
    --tag-text: #8b9cf7;
    --badge-local-bg: rgba(102, 126, 234, 0.75);
    --badge-url-bg: rgba(16, 185, 129, 0.75);
    --badge-embed-bg: rgba(245, 158, 11, 0.75);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    transition: background var(--transition-base), color var(--transition-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==========================================
   Scroll Animations
   ========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes shimmer {
    0%, 100% { background-position: 0% center; }
    50% { background-position: 100% center; }
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes slideInFromBottom {
    from {
        opacity: 0;
        transform: translateY(100%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes titleLine {
    0%, 100% { width: 60px; }
    50% { width: 80px; }
}

@keyframes ripple {
    0% {
        transform: translate(-50%, -50%) scale(0);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -50%) scale(4);
        opacity: 0;
    }
}

/* Scroll Animation Classes */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.animate-on-scroll-visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-on-scroll:nth-child(1) { transition-delay: 0.05s; }
.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.15s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.25s; }
.animate-on-scroll:nth-child(6) { transition-delay: 0.3s; }

/* Navigation */
.navbar {
    background: var(--nav-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-base);
    border-bottom: 1px solid var(--border-color);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: transform var(--transition-fast);
    letter-spacing: -0.5px;
    position: relative;
}

.logo:hover {
    transform: scale(1.03);
}

.logo::after {
    content: '';
    position: absolute;
    top: -8px;
    right: -16px;
    width: 6px;
    height: 6px;
    background: var(--primary-start);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.5);
        opacity: 0.5;
    }
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu li {
    position: relative;
}

.nav-menu li::after {
    content: '';
    position: absolute;
    right: -16px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    background: var(--border-color);
    border-radius: 50%;
    opacity: 0.5;
}

.nav-menu li:last-child::after {
    display: none;
}

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 14px;
    position: relative;
    transition: all var(--transition-fast);
    padding: 8px 16px;
    letter-spacing: 0.3px;
    border-radius: var(--radius-full);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    border-radius: 1px;
    transition: width var(--transition-base);
}

.nav-menu a:hover {
    color: var(--primary-start);
    background: var(--tag-bg);
}

.nav-menu a.active {
    color: var(--primary-start);
    background: var(--tag-bg);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 60%;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--text-primary);
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.nav-toggle:hover {
    background: var(--bg-tertiary);
}

/* Nav search icon */
.nav-search-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    text-decoration: none;
    border-radius: var(--radius-sm);
}

.nav-search-icon:hover {
    color: var(--primary-start);
}

.nav-search-icon svg {
    width: 22px;
    height: 22px;
}

/* Theme toggle button */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    border: none;
    background: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.theme-toggle:hover {
    color: var(--primary-start);
}

.theme-toggle svg {
    width: 22px;
    height: 22px;
}

/* Hero Section */
.hero {
    background: var(--primary-gradient);
    color: #fff;
    padding: 100px 20px 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
    animation: float 15s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: linear-gradient(to top, var(--bg-primary), transparent);
    pointer-events: none;
}

@keyframes heroFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.15);
    color: #fff;
    animation: shimmer 3s ease-in-out infinite;
    letter-spacing: -0.5px;
}

.hero p {
    font-size: 18px;
    margin-bottom: 32px;
    opacity: 0.95;
    animation: fadeInUp 0.8s ease-out 0.15s both;
}

.hero .btn-primary {
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.btn-primary {
    display: inline-block;
    background: #fff;
    color: var(--primary-start);
    padding: 14px 32px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 15px;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.3px;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.4s, height 0.4s;
}

.btn-primary:hover::before {
    width: 300%;
    height: 300%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.25);
}

.btn-primary:active {
    transform: translateY(-1px) scale(0.98);
}

/* Featured Section */
.featured-section {
    padding: 80px 0 60px;
    background: var(--bg-primary);
    position: relative;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    color: var(--text-primary);
    position: relative;
    display: inline-block;
    width: 100%;
    letter-spacing: -0.3px;
}

.section-title::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 40px;
    background: var(--primary-gradient);
    opacity: 0.08;
    border-radius: var(--radius-full);
    z-index: -1;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary-gradient);
    margin: 16px auto 0;
    border-radius: var(--radius-full);
    animation: titleLine 2s ease-in-out infinite;
    position: relative;
}

@keyframes titleLine {
    0%, 100% {
        width: 60px;
        opacity: 1;
    }
    50% {
        width: 90px;
        opacity: 0.7;
    }
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.video-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    position: relative;
    border: 1px solid var(--border-color);
}

.video-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, transparent 60%, rgba(102, 126, 234, 0.03) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
    z-index: 1;
}

.video-card:hover::after {
    opacity: 1;
}

.video-card:hover,
.video-card:active {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--card-hover-border);
}

.video-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    transition: border-color var(--transition-base);
    pointer-events: none;
    z-index: 1;
}

.video-card:hover::before {
    border-color: var(--card-hover-border);
}

.video-cover {
    position: relative;
    width: 100%;
    aspect-ratio: 16/10;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    overflow: hidden;
}

.video-cover::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.4) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 1;
}

.video-card:hover .video-cover::before {
    opacity: 1;
}

.video-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.video-card:hover .video-cover img {
    transform: scale(1.1);
}

/* Video type badge */
.video-type-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 600;
    z-index: 2;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    letter-spacing: 0.3px;
}

.video-type-badge.local {
    background: var(--badge-local-bg);
    color: #fff;
}

.video-type-badge.url {
    background: var(--badge-url-bg);
    color: #fff;
}

.video-type-badge.embed {
    background: var(--badge-embed-bg);
    color: #fff;
}

/* Play count overlay */
.video-play-count {
    position: absolute;
    bottom: 10px;
    left: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: rgba(0,0,0,0.6);
    border-radius: var(--radius-full);
    color: #fff;
    font-size: 12px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.video-play-count svg {
    width: 14px;
    height: 14px;
}

.cover-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-gradient);
    color: #fff;
    font-size: 48px;
    opacity: 0.8;
}

.play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.85);
    width: 56px;
    height: 56px;
    background: rgba(255,255,255,0.95);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-start);
    font-size: 22px;
    opacity: 0;
    transition: all var(--transition-base);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.video-card:hover .play-icon {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.video-info {
    padding: 16px 18px 18px;
    position: relative;
    background: var(--bg-secondary);
}

.video-info h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-primary);
    transition: color var(--transition-fast);
    line-height: 1.4;
}

.video-card:hover .video-info h3 {
    color: var(--primary-start);
}

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

.video-info .category-tag {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    background: var(--tag-bg);
    border-radius: var(--radius-sm);
    color: var(--tag-text);
    font-size: 12px;
    font-weight: 500;
    transition: background var(--transition-fast);
}

.video-info .category-tag:hover {
    background: var(--tag-text);
    color: #fff;
}

.video-info .play-count {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
}

.video-info .play-count svg {
    width: 14px;
    height: 14px;
}

/* Category Filter */
.category-filter {
    display: flex;
    gap: 12px;
    padding: 25px 20px;
    background: var(--bg-secondary);
    overflow-x: auto;
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
    scrollbar-width: none;
    position: relative;
}

.category-filter::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.3), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.category-filter:hover::after {
    opacity: 1;
}

.category-filter::-webkit-scrollbar {
    display: none;
}

.category-filter a {
    padding: 10px 24px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    font-weight: 500;
    font-size: 14px;
    position: relative;
    overflow: hidden;
    color: var(--text-secondary);
    -webkit-tap-highlight-color: transparent;
}

.category-filter a::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.4s, height 0.4s;
}

.category-filter a:hover::before {
    width: 200%;
    height: 200%;
}

.category-filter a.active,
.category-filter a:hover {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
    transform: translateY(-2px);
}

.category-filter a:active {
    transform: translateY(0) scale(0.95);
}

/* Swipe CTA */
.swipe-cta {
    background: var(--primary-gradient);
    color: #fff;
    padding: 100px 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-base);
}

.swipe-cta:hover {
    transform: scale(1.01);
}

.swipe-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    animation: patternMove 20s linear infinite;
}

@keyframes patternMove {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(60px, 60px);
    }
}

.swipe-cta h2 {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 15px;
    position: relative;
    z-index: 1;
}

.swipe-cta p {
    font-size: 18px;
    margin-bottom: 35px;
    opacity: 0.95;
    position: relative;
    z-index: 1;
}

.swipe-cta .btn-primary {
    background: #fff;
    color: var(--primary-start);
    position: relative;
    z-index: 1;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.swipe-cta .btn-primary:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

/* Swipe Mode Button */
.swipe-mode-btn {
    text-align: center;
    padding: 50px 20px;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    padding: 40px 20px;
    flex-wrap: wrap;
}

.page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    height: auto;
    padding: 0 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: all var(--transition-base);
    -webkit-tap-highlight-color: transparent;
}

.page-btn:hover,
.page-btn:active {
    border-color: var(--primary-start);
    color: var(--primary-start);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.page-btn.active {
    background: var(--primary-gradient);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.page-btn:active {
    transform: translateY(0) scale(0.95);
}

.page-ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    color: var(--text-tertiary);
    font-size: 16px;
}

/* 404 Error Page */
.error-page {
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
}

.error-content {
    text-align: center;
    max-width: 500px;
}

.error-code {
    font-size: 120px;
    font-weight: 900;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 20px;
}

.error-content h1 {
    font-size: 28px;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.error-content p {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 30px;
}

.error-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-secondary {
    display: inline-block;
    padding: 12px 30px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    -webkit-tap-highlight-color: transparent;
}

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

/* Video Detail */
.video-detail {
    background: #000;
    max-width: 900px;
    margin: 0 auto;
}

.video-player {
    width: 100%;
    aspect-ratio: 9/16;
    max-height: 80vh;
    background: #000;
    position: relative;
}

.video-player video,
.video-player iframe {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Mute hint overlay */
.mute-hint {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.7);
    color: #fff;
    padding: 8px 16px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
    z-index: 10;
}

.video-detail-info {
    padding: 25px;
    background: var(--bg-secondary);
}

.video-detail-info h1 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.video-meta {
    display: flex;
    gap: 20px;
    color: var(--text-tertiary);
    margin-bottom: 18px;
    font-size: 14px;
}

.video-desc {
    color: var(--text-secondary);
    line-height: 1.8;
}

.related-videos {
    padding: 50px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.related-videos h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-primary);
}

/* Footer */
.footer {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
    padding: 60px 20px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.5), transparent);
}

.footer::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.footer-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-brand {
    margin-bottom: 30px;
}

.footer-brand .logo {
    font-size: 28px;
    margin-bottom: 12px;
    display: inline-block;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    transition: color var(--transition-fast);
    padding: 8px 16px;
    border-radius: var(--radius-full);
}

.footer-links a:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.footer-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    margin: 30px 0;
}

.footer p {
    opacity: 0.6;
    font-size: 14px;
    position: relative;
    z-index: 1;
}

/* Bottom Navigation (Mobile H5) */
.bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--bottom-nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 -2px 20px rgba(0,0,0,0.08);
    z-index: 1000;
    padding-bottom: env(safe-area-inset-bottom);
}

.bottom-nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.3), transparent);
}

.bottom-nav-list {
    display: flex;
    height: 100%;
    list-style: none;
}

.bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    text-decoration: none;
    color: var(--text-tertiary);
    transition: all var(--transition-base);
    position: relative;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
    touch-action: manipulation;
    overflow: hidden;
}

.bottom-nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 40px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: 0 0 3px 3px;
    transition: transform var(--transition-base);
}

.bottom-nav-item::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    transition: width var(--transition-base), height var(--transition-base);
}

.bottom-nav-item:active::after {
    width: 150%;
    height: 150%;
}

.bottom-nav-item.active::before {
    transform: translateX(-50%) scaleX(1);
}

.bottom-nav-item.active {
    color: var(--primary-start);
}

.bottom-nav-item.active svg {
    transform: translateY(-2px);
    filter: drop-shadow(0 2px 4px rgba(102, 126, 234, 0.3));
}

.bottom-nav-item:active {
    background: rgba(102, 126, 234, 0.05);
}

.bottom-nav-item svg {
    width: 24px;
    height: 24px;
    transition: all var(--transition-base);
}

.bottom-nav-item:active svg {
    transform: scale(0.85) translateY(-2px);
}

.bottom-nav-item span {
    font-size: 11px;
    font-weight: 500;
    transition: color var(--transition-base);
}

/* ==========================================
   DOUYIN-STYLE SWIPE PLAYER (Enhanced)
   ========================================== */
.swipe-player {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: #000;
    overflow: hidden;
    z-index: 9999;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
}

.swipe-container {
    width: 100%;
    height: 100%;
    position: relative;
}

.swipe-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transform: scale(0.95);
    transition: opacity var(--transition-base),
                transform var(--transition-base);
    pointer-events: none;
}

.swipe-item.active {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}

.video-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #000;
}

.video-wrapper video,
.video-wrapper iframe {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #000;
}

/* Top bar */
.swipe-topbar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 15px;
    background: linear-gradient(180deg, rgba(0,0,0,0.6) 0%, transparent 100%);
    z-index: 100;
}

.back-btn {
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    min-width: 44px;
    -webkit-tap-highlight-color: transparent;
}

.back-btn:hover {
    background: rgba(255,255,255,0.1);
}

.topbar-title {
    color: #fff;
    font-size: 16px;
    font-weight: 500;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.action-icon-btn {
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    min-width: 44px;
    -webkit-tap-highlight-color: transparent;
}

.action-icon-btn:hover {
    background: rgba(255,255,255,0.1);
}

/* Side action buttons */
.side-actions {
    position: absolute;
    right: 15px;
    bottom: 150px;
    display: flex;
    flex-direction: column;
    gap: 25px;
    z-index: 100;
}

.side-action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
    transition: transform var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.side-action-btn:active {
    transform: scale(0.9);
}

.side-action-btn span {
    font-size: 12px;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.side-action-btn svg {
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
    transition: transform var(--transition-fast), fill var(--transition-fast);
}

.side-action-btn:active svg {
    transform: scale(1.2);
}

/* Video info overlay */
.video-info-overlay {
    position: absolute;
    bottom: 80px;
    left: 15px;
    right: 80px;
    color: #fff;
    z-index: 100;
}

.video-author {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: bold;
    border: 2px solid #fff;
}

.author-info h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.author-info p {
    font-size: 13px;
    opacity: 0.8;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

.video-description {
    font-size: 14px;
    line-height: 1.6;
    opacity: 0.9;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Progress bar */
.progress-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: rgba(255,255,255,0.2);
    z-index: 100;
}

.progress-fill {
    height: 100%;
    background: #fff;
    width: 0%;
    transition: width 0.1s linear;
}

/* Play hint */
.play-hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    opacity: 0;
    color: rgba(255,255,255,0.8);
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
    z-index: 100;
}

/* Toast hint */
.toast-hint {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: #fff;
    padding: 16px 28px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    opacity: 0;
    transition: all var(--transition-base);
    z-index: 10000;
    pointer-events: none;
    box-shadow: 0 8px 30px rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.1);
    max-width: 80%;
    text-align: center;
}

.toast-hint.show {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

/* Loading indicator */
.loading-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    color: #fff;
    z-index: 100;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255,255,255,0.2);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Error state */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    color: #fff;
}

.error-state p {
    font-size: 16px;
}

.error-state button {
    padding: 10px 30px;
    background: #fff;
    color: #000;
    border: none;
    border-radius: var(--radius-full);
    font-size: 14px;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.error-state button:hover {
    transform: scale(1.05);
}

/* ==========================================
   Skeleton Loading Animation
   ========================================== */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-tertiary) 25%,
        var(--border-color) 50%,
        var(--bg-tertiary) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

.skeleton-text {
    height: 14px;
    margin-bottom: 8px;
    border-radius: var(--radius-sm);
}

.skeleton-text:last-child {
    width: 70%;
    margin-bottom: 0;
}

.skeleton-title {
    height: 20px;
    width: 80%;
    margin-bottom: 12px;
    border-radius: var(--radius-sm);
}

.skeleton-image {
    width: 100%;
    aspect-ratio: 16/10;
    border-radius: var(--radius-lg);
}

.skeleton-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.skeleton-card .skeleton-image {
    border-radius: 0;
}

.skeleton-card .skeleton-content {
    padding: 16px;
}

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

/* ==========================================
   Ripple Effect for Buttons
   ========================================== */
.ripple {
    position: relative;
    overflow: hidden;
}

.ripple-effect {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
}

/* ==========================================
   Page Transitions
   ========================================== */
.page-transition-enter {
    opacity: 0;
    transform: translateY(10px);
}

.page-transition-enter-active {
    opacity: 1;
    transform: translateY(0);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.page-transition-exit {
    opacity: 1;
}

.page-transition-exit-active {
    opacity: 0;
    transition: opacity var(--transition-base);
}

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

    .animate-on-scroll {
        opacity: 1;
        transform: none;
    }

    .video-card:hover {
        transform: none;
    }

    .video-card:hover .video-cover img {
        transform: none;
    }

    .hero::before {
        animation: none;
    }
}

/* ==========================================
   Responsive - Enhanced Breakpoints
   ========================================== */

/* Large screens (1024px+) */
@media (min-width: 1024px) {
    .container {
        padding: 0 40px;
    }

    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        gap: 28px;
    }
}

/* Tablets (768px - 1023px) */
@media (max-width: 1023px) {
    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
        gap: 20px;
    }

    .hero h1 {
        font-size: 42px;
    }

    .section-title {
        font-size: 28px;
    }
}

/* Mobile (max-width: 768px) */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: block;
    }

    .nav-right {
        display: flex;
        align-items: center;
        gap: 8px;
    }

    /* Show bottom nav on mobile */
    .bottom-nav {
        display: block;
    }

    /* Add bottom padding to prevent content from being hidden behind bottom nav */
    .footer {
        padding-bottom: 80px;
    }

    .swipe-mode-btn {
        padding-bottom: 80px;
    }

    .pagination {
        padding-bottom: 80px;
    }

    .hero {
        padding: 100px 20px 80px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 16px;
    }

    .section-title {
        font-size: 28px;
    }

    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 20px;
    }

    .swipe-cta h2 {
        font-size: 28px;
    }

    .side-actions {
        right: 10px;
        bottom: 120px;
        gap: 20px;
    }

    .side-action-btn svg {
        width: 28px;
        height: 28px;
    }

    .video-info-overlay {
        bottom: 60px;
        left: 10px;
        right: 70px;
    }
}

/* Small mobile (max-width: 480px) */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero p {
        font-size: 14px;
    }

    .video-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .section-title {
        font-size: 24px;
    }

    .swipe-cta {
        padding: 60px 16px;
    }

    .swipe-cta h2 {
        font-size: 24px;
    }

    .swipe-cta p {
        font-size: 15px;
    }

    .error-code {
        font-size: 80px;
    }

    .error-content h1 {
        font-size: 22px;
    }

    .page-btn {
        min-width: 44px;
        min-height: 44px;
        padding: 8px 12px;
        font-size: 13px;
    }

    .category-filter {
        padding: 16px;
        gap: 8px;
    }

    .category-filter a {
        padding: 8px 18px;
        font-size: 13px;
    }

    .bottom-nav-item svg {
        width: 22px;
        height: 22px;
    }

    .bottom-nav-item span {
        font-size: 10px;
    }
}

/* Search Page Styles */
.search-container {
    padding: 40px 20px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    position: relative;
    overflow: hidden;
}

.search-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.search-container::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, rgba(102, 126, 234, 0.03) 0%, transparent 70%);
    pointer-events: none;
}

.search-form {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    gap: 12px;
    position: relative;
    z-index: 1;
}

.search-input {
    flex: 1;
    padding: 16px 28px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 16px;
    transition: all var(--transition-base);
    outline: none;
    background: var(--input-bg);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

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

.search-input:focus::placeholder {
    color: var(--text-tertiary);
}

.search-input:focus {
    border-color: var(--primary-start);
    background: var(--input-focus-bg);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15), var(--shadow-md);
}

.search-btn {
    padding: 16px 32px;
    background: var(--primary-gradient);
    color: #fff;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.search-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.4s, height 0.4s;
}

.search-btn:hover::before {
    width: 300%;
    height: 300%;
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.search-btn:active {
    transform: translateY(0) scale(0.95);
}

.search-result-header {
    margin: 40px 0 30px;
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.search-result-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
}

.search-result-header h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.search-result-header .highlight {
    color: var(--primary-start);
    font-weight: 700;
    position: relative;
    padding: 2px 8px;
    background: linear-gradient(180deg, transparent 60%, rgba(102, 126, 234, 0.15) 60%);
}

.search-result-header p {
    color: var(--text-tertiary);
    font-size: 14px;
}

.search-result-header strong {
    color: var(--primary-start);
    font-weight: 700;
}

.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-tertiary);
    animation: fadeInUp 0.6s ease-out;
}

.empty-state svg {
    margin-bottom: 20px;
    opacity: 0.3;
    animation: float 3s ease-in-out infinite;
}

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

.empty-state p {
    font-size: 16px;
}

/* Skeleton Loading Animation */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-tertiary) 0%,
        var(--border-color) 50%,
        var(--bg-tertiary) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.skeleton-title {
    height: 20px;
    width: 80%;
}

.skeleton-cover {
    width: 100%;
    padding-top: 56.25%;
    border-radius: var(--radius-md);
}

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

/* Admin Styles */
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.admin-header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.btn-primary {
    padding: 10px 24px;
    background: var(--primary-gradient);
    color: #fff;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    display: inline-block;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:active {
    transform: translateY(-1px) scale(0.98);
}

.admin-table-container {
    width: 100%;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.admin-table-container table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table-container th {
    background: var(--bg-tertiary);
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.admin-table-container td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.admin-table-container tr:hover {
    background: var(--bg-tertiary);
}

.admin-table-container a {
    color: var(--primary-start);
    margin-right: 15px;
    transition: color var(--transition-base);
}

.admin-table-container a:hover {
    color: var(--primary-end);
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
}

.pagination a {
    padding: 8px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    -webkit-tap-highlight-color: transparent;
}

.pagination a:hover,
.pagination a.active {
    background: var(--primary-gradient);
    color: #fff;
}

/* Admin Form Styles */
.admin-form {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    max-width: 800px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="url"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 15px;
    transition: border-color var(--transition-base);
    outline: none;
    background: var(--input-bg);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-start);
    background: var(--input-focus-bg);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.form-actions .btn-primary {
    padding: 12px 30px;
}

.form-actions .btn-secondary {
    padding: 12px 30px;
    background: var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: background var(--transition-base);
}

.form-actions .btn-secondary:hover {
    background: var(--border-hover);
}

/* Responsive Admin */
@media (max-width: 768px) {
    .admin-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

    .admin-table-container {
        overflow-x: auto;
    }

    .admin-form {
        padding: 20px;
    }

    .form-actions {
        flex-direction: column;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* Stats Dashboard */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 25px;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    margin-bottom: 15px;
    background: var(--primary-gradient);
}

.stat-content h3 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.stat-content p {
    color: var(--text-tertiary);
    font-size: 14px;
}

.stat-link {
    position: absolute;
    bottom: 20px;
    right: 20px;
    color: var(--primary-start);
    font-size: 14px;
    font-weight: 500;
    transition: color var(--transition-base);
}

.stat-link:hover {
    color: var(--primary-end);
}

/* Quick Actions */
.quick-actions {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 25px;
    box-shadow: var(--shadow-sm);
}

.quick-actions h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.action-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-weight: 500;
    transition: all var(--transition-base);
    -webkit-tap-highlight-color: transparent;
}

.action-btn:hover {
    background: var(--primary-start);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

/* Admin Layout */
.admin-layout {
    display: flex;
    min-height: 100vh;
    background: var(--bg-tertiary);
}

.admin-sidebar {
    width: 250px;
    background: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
    padding: 30px 0;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    z-index: 100;
    scrollbar-width: none !important;
    -ms-overflow-style: none !important;
}

.admin-sidebar::-webkit-scrollbar {
    width: 0 !important;
    display: none !important;
}

.admin-sidebar::-webkit-scrollbar-track {
    display: none !important;
}

.admin-sidebar::-webkit-scrollbar-thumb {
    display: none !important;
}

.admin-sidebar h2 {
    padding: 0 25px 25px;
    font-size: 20px;
    font-weight: 700;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 20px;
}

.admin-sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
    min-height: 0;
}

.nav-badge {
    display: inline-block;
    background: #ef4444;
    color: #fff;
    font-size: 11px;
    padding: 1px 7px;
    border-radius: 10px;
    margin-left: 6px;
    line-height: 1.6;
}

.admin-sidebar nav a {
    padding: 12px 25px;
    color: rgba(255,255,255,0.7);
    transition: all var(--transition-base);
    font-weight: 500;
    -webkit-tap-highlight-color: transparent;
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-decoration: none;
}

.nav-group-items a {
    padding-left: 38px !important;
    font-size: 14px;
}

.admin-sidebar nav a:hover,
.admin-sidebar nav a.active {
    background: rgba(255,255,255,0.1);
    color: #fff;
    border-left: 3px solid var(--primary-start);
}

.nav-divider {
    padding: 10px 25px 5px;
    color: rgba(255,255,255,0.3);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 10px;
}

.nav-group {
    position: relative;
}

.nav-group-header {
    padding: 12px 25px;
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    user-select: none;
    transition: all 0.2s;
}

.nav-group-header:hover {
    color: #fff;
    background: rgba(255,255,255,0.06);
}

.nav-group-arrow {
    font-size: 16px;
    opacity: 0.4;
    transition: all 0.2s;
}

.nav-group:hover .nav-group-arrow {
    opacity: 1;
}

.nav-group-items {
    display: none;
}

.logout-link {
    color: rgba(255,100,100,0.7) !important;
}

.logout-link:hover {
    color: #ff6b6b !important;
    border-left-color: #ff6b6b !important;
}

.admin-sidebar-footer {
    padding: 10px 0 15px;
    border-top: 1px solid rgba(255,255,255,0.1);
    flex-shrink: 0;
}

.admin-sidebar-footer .footer-link {
    display: block;
    padding: 10px 25px;
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
    white-space: nowrap;
}

.admin-sidebar-footer .footer-link:hover {
    background: rgba(255,255,255,0.05);
    color: #fff;
}

.admin-sidebar-footer .logout-link {
    color: rgba(255,100,100,0.7) !important;
}

.admin-sidebar-footer .logout-link:hover {
    color: #ff6b6b !important;
    background: rgba(255,100,100,0.1);
}

.admin-user-info {
    margin: 10px 25px 0;
    padding: 10px 15px;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: rgba(255,255,255,0.5);
    text-align: center;
}

.admin-main {
    flex: 1;
    margin-left: 250px;
    padding: 30px;
}

@media (max-width: 768px) {
    .admin-layout {
        flex-direction: column;
    }

    .admin-sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }

    .admin-main {
        margin-left: 0;
        padding: 20px;
    }

    .admin-sidebar nav {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .admin-sidebar nav a {
        padding: 10px 15px;
        font-size: 14px;
    }
}

/* Admin Filter Bar */
.admin-filter-bar {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
}

.filter-form {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.filter-input {
    padding: 10px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    min-width: 200px;
    transition: border-color var(--transition-base);
    outline: none;
    background: var(--input-bg);
    color: var(--text-primary);
}

.filter-input:focus {
    border-color: var(--primary-start);
    background: var(--input-focus-bg);
}

.filter-select {
    padding: 10px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    background: var(--input-bg);
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition-base);
}

.filter-select:focus {
    border-color: var(--primary-start);
}

.btn-filter {
    padding: 10px 24px;
    background: var(--primary-gradient);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    -webkit-tap-highlight-color: transparent;
}

.btn-filter:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-reset {
    padding: 10px 24px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: background var(--transition-base);
    border: none;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.btn-reset:hover {
    background: var(--border-color);
}

@media (max-width: 768px) {
    .filter-form {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-input,
    .filter-select,
    .btn-filter,
    .btn-reset {
        width: 100%;
    }
}

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

.wechat-header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 10px 20px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.wechat-user {
    display: flex;
    align-items: center;
    gap: 10px;
}

.wechat-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.wechat-nickname {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

.wechat-login-btn {
    display: inline-block;
    padding: 6px 16px;
    background: #07c160;
    color: #fff;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
    transition: background var(--transition-base);
    -webkit-tap-highlight-color: transparent;
}

.wechat-login-btn:hover {
    background: #06ad56;
}

.wechat-logout {
    font-size: 12px;
    color: var(--text-tertiary);
    transition: color var(--transition-base);
}

.wechat-logout:hover {
    color: var(--primary-start);
}

/* WeChat specific body padding when header is shown */
body.wechat-mode {
    padding-top: 0;
}

@media (max-width: 768px) {
    .wechat-header-inner {
        padding: 8px 15px;
    }

    .wechat-avatar {
        width: 28px;
        height: 28px;
    }

    .wechat-nickname {
        font-size: 13px;
    }
}

/* Contact Modal */
.contact-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: none;
    align-items: center;
    justify-content: center;
}

.contact-modal.active {
    display: flex;
}

.contact-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--overlay-bg);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.contact-modal-content {
    position: relative;
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    padding: 30px;
    max-width: 400px;
    width: 90%;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease-out;
}

.contact-modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: all var(--transition-base);
    min-height: 44px;
    min-width: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
}

.contact-modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.contact-modal-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 20px 0;
    padding-right: 40px;
}

.contact-modal-body {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.contact-item:hover {
    background: var(--border-color);
    transform: translateX(4px);
}

.contact-icon {
    color: var(--primary-start);
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-label {
    font-size: 12px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-value {
    font-size: 15px;
    color: var(--text-primary);
    text-decoration: none;
    word-break: break-all;
    transition: color var(--transition-fast);
}

.contact-value:hover {
    color: var(--primary-start);
}

/* Contact modal loading, error and empty states */
.contact-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 30px;
    color: var(--text-tertiary);
}

.loading-spinner-small {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-start);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.contact-error {
    text-align: center;
    padding: 30px;
    color: var(--text-danger, #e53e3e);
    font-size: 14px;
}

.contact-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 30px;
    color: var(--text-tertiary);
}

.contact-empty svg {
    opacity: 0.3;
}

.contact-empty p {
    margin: 0;
    font-size: 14px;
}

/* Detail Page Action Buttons */
.video-detail-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 15px;
    margin-bottom: 15px;
}

.video-detail-header h1 {
    flex: 1;
    margin: 0;
}

.video-detail-actions {
    display: flex;
    gap: 10px;
    flex-shrink: 0;
}

.detail-action-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-base);
    -webkit-tap-highlight-color: transparent;
}

.detail-action-btn:hover {
    background: var(--primary-start);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.detail-action-btn svg {
    flex-shrink: 0;
}

/* Toast Hint (for detail page) */
.toast-hint {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-size: 14px;
    z-index: 9999;
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.toast-hint.show {
    opacity: 1;
}

/* Responsive for contact modal */
@media (max-width: 768px) {
    .contact-modal-content {
        padding: 24px;
        width: 95%;
    }

    .contact-modal-title {
        font-size: 20px;
    }

    .video-detail-header {
        flex-direction: column;
    }

    .video-detail-actions {
        align-self: flex-start;
    }

    .detail-action-btn {
        padding: 6px 12px;
        font-size: 13px;
    }
}

/* Additional mobile touch optimizations */
@media (max-width: 768px) {
    .btn-primary,
    .btn-secondary,
    .btn-filter,
    .btn-reset,
    .search-btn,
    .action-btn,
    .detail-action-btn,
    .page-btn,
    .wechat-login-btn,
    .contact-modal-close,
    .back-btn,
    .action-icon-btn {
        min-height: 44px;
    }

    input,
    select,
    textarea {
        font-size: 16px; /* Prevents iOS zoom on focus */
    }

    /* Ensure all interactive elements have proper touch targets */
    .nav-item,
    .category-filter a,
    .btn-secondary {
        min-height: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    /* Smooth scrolling for mobile */
    html {
        scroll-behavior: smooth;
    }

    /* Prevent horizontal scroll on mobile */
    body {
        max-width: 100vw;
        overflow-x: hidden;
    }
}