/* ============================================
   51视频 - 原创样式表
   品牌色系：深靛蓝 #1a1e3a / 霓虹紫 #7c3aed / 樱粉 #f43f8e / 金橙 #f59e0b
   ============================================ */

/* CSS Variables */
:root {
    --color-bg: #0d0f1c;
    --color-bg-alt: #141729;
    --color-bg-card: #1a1e3a;
    --color-bg-card-hover: #222750;
    --color-primary: #7c3aed;
    --color-primary-light: #a78bfa;
    --color-accent: #f43f8e;
    --color-accent-light: #fb7bb8;
    --color-gold: #f59e0b;
    --color-gold-light: #fbbf24;
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-dim: #64748b;
    --color-border: #2d3258;
    --color-white: #ffffff;
    --font-main: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-hover: 0 8px 40px rgba(124,58,237,0.25);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --container-max: 1280px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
a { color: var(--color-primary-light); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--color-accent); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* Container */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 20px; }

/* ============================================
   Header & Navigation
   ============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(13, 15, 28, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}
.logo-link { display: flex; align-items: center; flex-shrink: 0; }
.logo-img { height: 42px; width: auto; }
.nav-list {
    display: flex;
    gap: 8px;
}
.nav-list a {
    display: block;
    padding: 8px 16px;
    color: var(--color-text);
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.nav-list a:hover, .nav-list a.nav-active {
    color: var(--color-white);
    background: var(--color-primary);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* Search Bar */
.search-bar-wrap {
    background: var(--color-bg-alt);
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
}
.search-form {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
}
.search-input {
    flex: 1;
    padding: 10px 18px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-right: none;
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    color: var(--color-text);
    font-size: 14px;
    outline: none;
    transition: var(--transition);
}
.search-input:focus { border-color: var(--color-primary); }
.search-input::placeholder { color: var(--color-text-dim); }
.search-btn {
    padding: 10px 24px;
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 14px;
    font-weight: 600;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    transition: var(--transition);
}
.search-btn:hover { background: var(--color-accent); }

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    margin-top: 110px;
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    filter: brightness(0.35) saturate(1.2);
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(124,58,237,0.4) 0%, rgba(244,63,142,0.3) 50%, rgba(13,15,28,0.8) 100%);
}
.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 60px 20px;
}
.hero-title {
    font-size: 42px;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: 20px;
    line-height: 1.3;
    text-shadow: 0 2px 20px rgba(124,58,237,0.5);
}
.hero-desc {
    font-size: 18px;
    color: var(--color-text);
    max-width: 720px;
    margin: 0 auto 32px;
    line-height: 1.8;
}
.hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}
.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
    flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-num {
    display: block;
    font-size: 32px;
    font-weight: 800;
    color: var(--color-gold);
    text-shadow: 0 0 20px rgba(245,158,11,0.4);
}
.stat-label {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    text-align: center;
}
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-white);
    box-shadow: 0 4px 20px rgba(124,58,237,0.4);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(124,58,237,0.6);
    color: var(--color-white);
}
.btn-outline {
    border: 2px solid var(--color-primary-light);
    color: var(--color-primary-light);
    background: transparent;
}
.btn-outline:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}
.btn-secondary {
    background: var(--color-bg-card);
    color: var(--color-primary-light);
    border: 1px solid var(--color-border);
}
.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}
.btn-sm { padding: 8px 18px; font-size: 13px; border-radius: var(--radius-sm); background: var(--color-primary); color: var(--color-white); }
.btn-sm:hover { background: var(--color-accent); color: var(--color-white); }
.btn-outline-sm { background: transparent; border: 1px solid var(--color-primary-light); color: var(--color-primary-light); }
.btn-outline-sm:hover { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-white); }

/* ============================================
   Breadcrumb
   ============================================ */
.breadcrumb-nav {
    padding: 12px 0;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
}
.breadcrumb {
    display: flex;
    gap: 8px;
    font-size: 13px;
    color: var(--color-text-dim);
}
.breadcrumb li::after { content: " / "; margin-left: 8px; color: var(--color-text-dim); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-primary-light); }

/* ============================================
   Section Common
   ============================================ */
.section { padding: 64px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-title {
    font-size: 32px;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: 16px;
    position: relative;
    display: inline-block;
}
.section-title::after {
    content: "";
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    margin: 12px auto 0;
    border-radius: 2px;
}
.section-desc {
    font-size: 16px;
    color: var(--color-text-muted);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
}
.section-more { text-align: center; margin-top: 40px; }

/* ============================================
   Video Grid & Cards
   ============================================ */
.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.video-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}
.video-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--color-primary);
}
.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--color-bg);
}
.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }

/* Play Overlay */
.play-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.35);
    opacity: 0;
    transition: var(--transition);
}
.video-card:hover .play-overlay { opacity: 1; }
.play-btn-circle {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: rgba(124,58,237,0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: 0 0 30px rgba(124,58,237,0.5);
}
.play-btn-circle:hover {
    background: var(--color-accent);
    transform: scale(1.1);
}
.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.75);
    color: var(--color-white);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}
.video-tag {
    position: absolute;
    top: 8px;
    left: 8px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-white);
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}
.video-info { padding: 16px; }
.video-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.video-meta {
    display: flex;
    gap: 12px;
    font-size: 12px;
    color: var(--color-text-dim);
}
.video-desc {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-top: 8px;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ============================================
   Services Grid
   ============================================ */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.service-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}
.service-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-hover);
}
.service-icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: block;
}
.service-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 12px;
}
.service-card p {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ============================================
   Entertainment Grid
   ============================================ */
.entertainment-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 16px;
}
.ent-card {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 3/4;
}
.ent-card.ent-large {
    grid-row: span 2;
    aspect-ratio: auto;
}
.ent-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.ent-card:hover img { transform: scale(1.08); }
.ent-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px;
    background: linear-gradient(transparent, rgba(0,0,0,0.85));
}
.ent-tag {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-white);
    padding: 2px 10px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    margin-bottom: 8px;
}
.ent-overlay h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 4px;
}
.ent-overlay p {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* ============================================
   AI Section
   ============================================ */
.ai-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}
.ai-image {
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
}
.ai-image img { width: 100%; }
.ai-features { display: flex; flex-direction: column; gap: 24px; }
.ai-feature {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
}
.ai-feature:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-hover);
}
.ai-feature h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-primary-light);
    margin-bottom: 8px;
}
.ai-feature p {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ============================================
   Community Section
   ============================================ */
.community-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.comm-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition);
}
.comm-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-accent);
    box-shadow: 0 8px 40px rgba(244,63,142,0.2);
}
.comm-icon {
    font-size: 36px;
    margin-bottom: 12px;
}
.comm-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 10px;
}
.comm-card p {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
}
.community-banner {
    margin-top: 40px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
}
.community-banner img { width: 100%; }

/* ============================================
   Experts Section
   ============================================ */
.experts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.expert-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}
.expert-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-gold);
    box-shadow: 0 8px 40px rgba(245,158,11,0.2);
}
.expert-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 16px;
    border: 3px solid var(--color-primary);
}
.expert-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 4px;
}
.expert-role {
    font-size: 14px;
    color: var(--color-primary-light);
    margin-bottom: 12px;
}
.expert-desc {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 12px;
}
.expert-tags {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 16px;
}
.expert-tags span {
    background: rgba(124,58,237,0.2);
    color: var(--color-primary-light);
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 12px;
}
.expert-actions {
    display: flex;
    gap: 8px;
    justify-content: center;
}

/* ============================================
   Partners Section
   ============================================ */
.partners-wall {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
    margin-bottom: 48px;
}
.partner-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 16px 32px;
    transition: var(--transition);
}
.partner-item:hover {
    border-color: var(--color-primary);
    background: var(--color-bg-card-hover);
}
.partner-item span {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text-muted);
}

/* HowTo Steps */
.howto-section { margin-top: 48px; }
.howto-section h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-white);
    text-align: center;
    margin-bottom: 32px;
}
.howto-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.howto-step {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px 20px;
    text-align: center;
    transition: var(--transition);
}
.howto-step:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}
.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-white);
    font-size: 18px;
    font-weight: 800;
    margin-bottom: 12px;
}
.howto-step h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 8px;
}
.howto-step p {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ============================================
   FAQ Section
   ============================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition);
}
.faq-item:hover { border-color: var(--color-primary); }
.faq-question {
    width: 100%;
    text-align: left;
    padding: 18px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--color-white);
    background: var(--color-bg-card);
    transition: var(--transition);
    position: relative;
    padding-right: 48px;
}
.faq-question::after {
    content: "+";
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 22px;
    color: var(--color-primary-light);
    transition: var(--transition);
}
.faq-question[aria-expanded="true"]::after {
    content: "−";
    color: var(--color-accent);
}
.faq-question:hover { background: var(--color-bg-card-hover); }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}
.faq-answer.open { max-height: 300px; }
.faq-answer p {
    padding: 0 24px 18px;
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.8;
    background: var(--color-bg-card);
}

/* ============================================
   Reviews Section
   ============================================ */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.review-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
}
.review-card:hover {
    border-color: var(--color-gold);
    box-shadow: 0 8px 30px rgba(245,158,11,0.15);
}
.review-stars {
    color: var(--color-gold);
    font-size: 18px;
    margin-bottom: 12px;
    letter-spacing: 2px;
}
.review-text {
    font-size: 14px;
    color: var(--color-text);
    line-height: 1.8;
    margin-bottom: 16px;
    font-style: italic;
}
.review-author { border-top: 1px solid var(--color-border); padding-top: 12px; }
.author-name {
    display: block;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-white);
}
.author-info {
    font-size: 12px;
    color: var(--color-text-dim);
}

/* ============================================
   Contact Section
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 40px;
}
.contact-info-card, .contact-community-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 32px;
}
.contact-info-card h3, .contact-community-card h3,
.contact-info-card h2, .contact-community-card h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 20px;
}
.contact-list li {
    padding: 8px 0;
    font-size: 14px;
    color: var(--color-text-muted);
    border-bottom: 1px solid rgba(45,50,88,0.5);
}
.contact-list li:last-child { border-bottom: none; }
.contact-list strong { color: var(--color-text); }
.qrcode-row {
    display: flex;
    gap: 24px;
    margin-top: 20px;
}
.qrcode-item {
    text-align: center;
}
.qrcode-item img {
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    border: 1px solid var(--color-border);
}
.qrcode-item span {
    font-size: 12px;
    color: var(--color-text-dim);
}

/* ============================================
   Share Section
   ============================================ */
.share-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 24px;
}
.share-btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-white);
    transition: var(--transition);
}
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #161823; border: 1px solid var(--color-border); }
.share-bilibili { background: #00a1d6; }
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; color: var(--color-white); }

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    padding: 48px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 32px;
    padding-bottom: 32px;
}
.footer-brand p {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-top: 12px;
}
.footer-logo { height: 36px; width: auto; margin-bottom: 8px; }
.footer-links h4, .footer-contact h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 16px;
}
.footer-links ul li { margin-bottom: 8px; }
.footer-links a {
    font-size: 13px;
    color: var(--color-text-muted);
}
.footer-links a:hover { color: var(--color-primary-light); }
.footer-contact p {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}
.footer-qrcode {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}
.footer-qrcode img {
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}
.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding: 16px 0;
    text-align: center;
}
.footer-bottom p {
    font-size: 13px;
    color: var(--color-text-dim);
}

/* ============================================
   Page Hero (Inner Pages)
   ============================================ */
.page-hero {
    background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-bg-card) 100%);
    padding: 48px 0;
    margin-top: 110px;
    border-bottom: 1px solid var(--color-border);
}
.page-hero h1 {
    font-size: 36px;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: 16px;
}
.page-desc {
    font-size: 16px;
    color: var(--color-text-muted);
    line-height: 1.8;
    max-width: 800px;
}
.star-hero {
    background: linear-gradient(135deg, rgba(124,58,237,0.15) 0%, var(--color-bg-card) 100%);
}

/* ============================================
   Tag Cloud
   ============================================ */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.tag-item {
    display: inline-block;
    padding: 6px 16px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 13px;
    color: var(--color-text-muted);
    transition: var(--transition);
}
.tag-item:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

/* ============================================
   Stats Grid (About Page)
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin: 32px 0 48px;
}
.stat-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition);
}
.stat-card:hover {
    border-color: var(--color-gold);
    box-shadow: 0 4px 20px rgba(245,158,11,0.15);
}
.stat-number {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--color-gold);
    margin-bottom: 4px;
}
.stat-text {
    font-size: 14px;
    color: var(--color-text-muted);
}

/* ============================================
   Timeline (About Page)
   ============================================ */
.timeline {
    position: relative;
    padding-left: 40px;
    margin-top: 32px;
}
.timeline::before {
    content: "";
    position: absolute;
    left: 12px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
}
.timeline-item {
    position: relative;
    margin-bottom: 32px;
    padding-left: 24px;
}
.timeline-item::before {
    content: "";
    position: absolute;
    left: -34px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 2px solid var(--color-bg);
}
.timeline-date {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-primary-light);
    margin-bottom: 4px;
}
.timeline-content h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 4px;
}
.timeline-content p {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ============================================
   Topic List (Community Page)
   ============================================ */
.topic-list { max-width: 800px; margin: 0 auto; }
.topic-item {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin-bottom: 12px;
    transition: var(--transition);
}
.topic-item:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
}
.topic-rank {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: var(--color-bg);
    color: var(--color-text-dim);
    font-size: 14px;
    font-weight: 800;
    flex-shrink: 0;
}
.topic-rank.hot {
    background: linear-gradient(135deg, var(--color-accent), var(--color-gold));
    color: var(--color-white);
}
.topic-content h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 2px;
}
.topic-content p {
    font-size: 12px;
    color: var(--color-text-dim);
}

/* ============================================
   Lazy Image Placeholder
   ============================================ */
.lazy-img {
    opacity: 1;
    transition: opacity 0.5s ease;
}
.lazy-img.loaded { opacity: 1; }

/* ============================================
   Mobile Responsive
   ============================================ */
@media (max-width: 1024px) {
    .video-grid { grid-template-columns: repeat(2, 1fr); }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .community-grid { grid-template-columns: repeat(2, 1fr); }
    .experts-grid { grid-template-columns: repeat(2, 1fr); }
    .reviews-grid { grid-template-columns: repeat(2, 1fr); }
    .entertainment-grid { grid-template-columns: repeat(2, 1fr); }
    .ent-card.ent-large { grid-row: span 1; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .howto-steps { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .ai-showcase { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .hero-section { min-height: 480px; margin-top: 100px; }
    .hero-title { font-size: 28px; }
    .hero-desc { font-size: 15px; }
    .hero-stats { gap: 24px; }
    .stat-num { font-size: 24px; }
    .section { padding: 40px 0; }
    .section-title { font-size: 24px; }
    .section-desc { font-size: 14px; }
    .video-grid { grid-template-columns: 1fr; }
    .services-grid { grid-template-columns: 1fr; }
    .community-grid { grid-template-columns: 1fr; }
    .experts-grid { grid-template-columns: 1fr; }
    .reviews-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .entertainment-grid { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .howto-steps { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .page-hero { margin-top: 100px; padding: 32px 0; }
    .page-hero h1 { font-size: 26px; }

    /* Mobile Nav */
    .main-nav {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--color-bg-alt);
        border-bottom: 1px solid var(--color-border);
        padding: 16px;
    }
    .main-nav.open { display: block; }
    .nav-list {
        flex-direction: column;
        gap: 4px;
    }
    .nav-list a {
        padding: 12px 16px;
    }
    .mobile-menu-btn { display: flex; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 24px; }
    .hero-btns { flex-direction: column; align-items: center; }
    .btn { width: 100%; max-width: 280px; }
    .entertainment-grid { grid-template-columns: 1fr; }
    .qrcode-row { flex-direction: column; align-items: center; }
    .share-buttons { flex-direction: column; align-items: center; }
}