/* =============================================
   萝莉岛 动漫视频分享平台 - 主样式文件
   网站：ztpktcpx.cn
   原创设计：竞速红 + 深空蓝 + 暗夜黑
   ============================================= */

/* ---- 基础重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --red:       #E63946;
    --red-dark:  #C1121F;
    --red-glow:  rgba(230,57,70,0.18);
    --navy:      #1D3557;
    --navy-light:#2E4A70;
    --sky:       #A8DADC;
    --sky-light: #CDE8EA;
    --white:     #F1FAEE;
    --dark:      #0B0C10;
    --dark2:     #14151C;
    --dark3:     #1E2030;
    --text:      #2B2D42;
    --text-muted:#6B7280;
    --border:    #D1D5DB;
    --radius:    10px;
    --radius-lg: 20px;
    --shadow:    0 4px 20px rgba(0,0,0,0.10);
    --shadow-red:0 6px 30px rgba(230,57,70,0.22);
    --trans:     0.3s cubic-bezier(.4,0,.2,1);
    --font:      'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
}

html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font); color: var(--text); background: var(--white); line-height: 1.75; overflow-x: hidden; }
a { color: inherit; text-decoration: none; transition: color var(--trans); }
a:hover { color: var(--red); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: var(--font); }

/* ---- 工具类 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }
.section-dark { background: var(--dark); color: var(--white); }
.section-navy { background: var(--navy); color: var(--white); }
.section-gray { background: #F8F9FB; }
.text-center { text-align: center; }
.text-red { color: var(--red); }
.text-white { color: var(--white); }
.fade-up { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ---- 标题样式 ---- */
.sec-title { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 900; color: var(--text); margin-bottom: 12px; letter-spacing: -0.5px; }
.sec-title span { color: var(--red); }
.sec-title.light { color: var(--white); }
.sec-sub { font-size: 1rem; color: var(--text-muted); margin-bottom: 48px; max-width: 600px; }
.sec-sub.light { color: rgba(255,255,255,0.7); }
.sec-header { margin-bottom: 48px; }
.sec-header.center { text-align: center; }
.sec-header.center .sec-sub { margin: 0 auto 0; }

/* ---- 按钮 ---- */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; border-radius: 50px; font-size: 0.95rem; font-weight: 700; transition: all var(--trans); }
.btn-red { background: var(--red); color: #fff; box-shadow: var(--shadow-red); }
.btn-red:hover { background: var(--red-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 10px 36px rgba(230,57,70,0.35); }
.btn-outline { border: 2px solid var(--red); color: var(--red); }
.btn-outline:hover { background: var(--red); color: #fff; }
.btn-navy { background: var(--navy); color: #fff; }
.btn-navy:hover { background: var(--navy-light); color: #fff; transform: translateY(-2px); }
.btn-ghost { border: 2px solid rgba(255,255,255,0.4); color: #fff; }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,0.1); }
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }

/* ============================================
   顶部导航
   ============================================ */
#site-header {
    position: sticky; top: 0; z-index: 1000;
    background: rgba(11,12,16,0.97);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(230,57,70,0.15);
    transition: box-shadow var(--trans);
}
#site-header.scrolled { box-shadow: 0 4px 24px rgba(0,0,0,0.4); }
.header-wrap { display: flex; align-items: center; gap: 24px; padding: 0 20px; height: 68px; max-width: 1300px; margin: 0 auto; }

/* Logo */
.site-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-badge {
    width: 44px; height: 44px; border-radius: 10px;
    background: linear-gradient(135deg, var(--red) 0%, var(--red-dark) 100%);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.3rem; font-weight: 900; color: #fff;
    box-shadow: 0 4px 14px rgba(230,57,70,0.4);
    letter-spacing: -1px;
}
.logo-text-wrap { display: flex; flex-direction: column; line-height: 1.2; }
.logo-name { font-size: 1.1rem; font-weight: 900; color: #fff; letter-spacing: 1px; }
.logo-slogan { font-size: 0.68rem; color: var(--sky); letter-spacing: 0.5px; }

/* 导航链接 */
.site-nav { display: flex; align-items: center; gap: 4px; flex: 1; }
.site-nav a {
    padding: 8px 14px; border-radius: 8px;
    font-size: 0.9rem; font-weight: 600; color: rgba(255,255,255,0.8);
    transition: all var(--trans); white-space: nowrap;
}
.site-nav a:hover, .site-nav a.active { color: #fff; background: rgba(230,57,70,0.15); }
.site-nav a.nav-cta { background: var(--red); color: #fff; padding: 8px 18px; margin-left: 8px; }
.site-nav a.nav-cta:hover { background: var(--red-dark); }

/* 搜索框 */
.header-search { position: relative; flex-shrink: 0; }
.header-search input {
    width: 220px; padding: 9px 40px 9px 16px; border-radius: 50px;
    border: 1.5px solid rgba(255,255,255,0.15);
    background: rgba(255,255,255,0.08); color: #fff; font-size: 0.88rem;
    transition: all var(--trans);
}
.header-search input::placeholder { color: rgba(255,255,255,0.4); }
.header-search input:focus { outline: none; border-color: var(--red); background: rgba(255,255,255,0.12); width: 260px; }
.header-search button { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); color: rgba(255,255,255,0.5); font-size: 1rem; }
.header-search button:hover { color: var(--red); }

/* 汉堡菜单 */
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 6px; }
.hamburger span { display: block; width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: all var(--trans); }
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================================
   全站搜索栏（导航下方）
   ============================================ */
.global-search-bar {
    background: var(--dark2); border-bottom: 1px solid rgba(255,255,255,0.06);
    padding: 14px 0;
}
.search-inner { display: flex; align-items: center; gap: 12px; max-width: 800px; margin: 0 auto; padding: 0 20px; }
.search-inner input {
    flex: 1; padding: 12px 20px; border-radius: 50px;
    border: 2px solid rgba(230,57,70,0.3);
    background: rgba(255,255,255,0.06); color: #fff; font-size: 0.95rem;
    transition: all var(--trans);
}
.search-inner input::placeholder { color: rgba(255,255,255,0.35); }
.search-inner input:focus { outline: none; border-color: var(--red); background: rgba(255,255,255,0.1); }
.search-inner .search-btn {
    padding: 12px 28px; border-radius: 50px; background: var(--red); color: #fff;
    font-size: 0.95rem; font-weight: 700; white-space: nowrap;
    transition: all var(--trans);
}
.search-inner .search-btn:hover { background: var(--red-dark); transform: translateY(-1px); }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; max-width: 800px; margin-left: auto; margin-right: auto; padding: 0 20px; }
.search-tag { padding: 4px 12px; border-radius: 50px; background: rgba(255,255,255,0.07); color: rgba(255,255,255,0.6); font-size: 0.8rem; cursor: pointer; transition: all var(--trans); }
.search-tag:hover { background: rgba(230,57,70,0.2); color: var(--red); }

/* ============================================
   首页 Banner
   ============================================ */
#hero-banner {
    position: relative; min-height: 92vh; display: flex; align-items: center;
    overflow: hidden; background: var(--dark);
}
.hero-bg {
    position: absolute; inset: 0;
    background-image: url('/images/banner.jpg');
    background-size: cover; background-position: center;
    transform: scale(1.05);
    transition: transform 8s ease;
}
#hero-banner:hover .hero-bg { transform: scale(1); }
.hero-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(105deg, rgba(11,12,16,0.88) 0%, rgba(29,53,87,0.55) 60%, rgba(11,12,16,0.4) 100%);
}
.hero-content { position: relative; z-index: 2; max-width: 720px; padding: 0 20px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 16px; border-radius: 50px;
    background: rgba(230,57,70,0.18); border: 1px solid rgba(230,57,70,0.4);
    color: var(--red); font-size: 0.82rem; font-weight: 700;
    margin-bottom: 24px; letter-spacing: 1px;
}
.hero-badge::before { content: '●'; font-size: 0.6rem; animation: pulse 1.5s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.3} }
.hero-h1 { font-size: clamp(2.4rem, 6vw, 4.2rem); font-weight: 900; color: #fff; line-height: 1.15; margin-bottom: 20px; letter-spacing: -1px; }
.hero-h1 em { color: var(--red); font-style: normal; }
.hero-desc { font-size: 1.05rem; color: rgba(255,255,255,0.78); margin-bottom: 36px; line-height: 1.8; max-width: 560px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 48px; }
.hero-stats { display: flex; gap: 32px; flex-wrap: wrap; }
.hero-stat-num { font-size: 1.8rem; font-weight: 900; color: var(--red); }
.hero-stat-label { font-size: 0.8rem; color: rgba(255,255,255,0.55); margin-top: 2px; }
.hero-scroll-hint {
    position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
    display: flex; flex-direction: column; align-items: center; gap: 6px;
    color: rgba(255,255,255,0.4); font-size: 0.75rem; z-index: 2;
    animation: bounce 2s infinite;
}
@keyframes bounce { 0%,100%{transform:translateX(-50%) translateY(0)} 50%{transform:translateX(-50%) translateY(8px)} }
.hero-scroll-hint::after { content: '↓'; font-size: 1.2rem; }

/* ============================================
   视频卡片
   ============================================ */
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.video-card {
    background: #fff; border-radius: var(--radius-lg); overflow: hidden;
    box-shadow: var(--shadow); transition: all var(--trans); cursor: pointer;
    border: 1px solid var(--border);
}
.video-card:hover { transform: translateY(-6px); box-shadow: 0 16px 48px rgba(0,0,0,0.14); }
.video-thumb-wrap { position: relative; aspect-ratio: 16/9; overflow: hidden; background: var(--dark); }
.video-thumb-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--trans); }
.video-card:hover .video-thumb-wrap img { transform: scale(1.06); }
.video-play-btn {
    position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
    background: rgba(0,0,0,0); transition: background var(--trans);
}
.video-card:hover .video-play-btn { background: rgba(0,0,0,0.35); }
.play-circle {
    width: 60px; height: 60px; border-radius: 50%;
    background: rgba(230,57,70,0.9); display: flex; align-items: center; justify-content: center;
    opacity: 0; transform: scale(0.7); transition: all var(--trans);
    box-shadow: 0 4px 20px rgba(230,57,70,0.5);
}
.video-card:hover .play-circle { opacity: 1; transform: scale(1); }
.play-arrow { width: 0; height: 0; border-style: solid; border-width: 10px 0 10px 18px; border-color: transparent transparent transparent #fff; margin-left: 4px; }
.video-tag { position: absolute; top: 12px; left: 12px; padding: 4px 10px; border-radius: 50px; background: var(--red); color: #fff; font-size: 0.75rem; font-weight: 700; }
.video-duration { position: absolute; bottom: 10px; right: 10px; padding: 3px 8px; border-radius: 4px; background: rgba(0,0,0,0.75); color: #fff; font-size: 0.75rem; font-weight: 600; }
.video-body { padding: 16px; }
.video-title { font-size: 0.95rem; font-weight: 700; color: var(--text); margin-bottom: 8px; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-meta { display: flex; justify-content: space-between; align-items: center; font-size: 0.78rem; color: var(--text-muted); margin-bottom: 10px; }
.video-stats { display: flex; gap: 12px; font-size: 0.78rem; color: var(--text-muted); }
.video-stats span { display: flex; align-items: center; gap: 4px; }

/* ============================================
   功能模块卡片
   ============================================ */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px; }
.feature-card {
    background: #fff; border-radius: var(--radius-lg); padding: 32px 28px;
    border: 1px solid var(--border); transition: all var(--trans);
    position: relative; overflow: hidden;
}
.feature-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--red), var(--red-dark));
    transform: scaleX(0); transition: transform var(--trans); transform-origin: left;
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.10); }
.feat-icon { font-size: 2.4rem; margin-bottom: 16px; }
.feat-title { font-size: 1.05rem; font-weight: 800; color: var(--text); margin-bottom: 10px; }
.feat-desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; }

/* ============================================
   AI 赋能区
   ============================================ */
.ai-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.ai-card {
    background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg); padding: 28px 24px;
    transition: all var(--trans);
}
.ai-card:hover { background: rgba(230,57,70,0.1); border-color: rgba(230,57,70,0.3); transform: translateY(-4px); }
.ai-icon { font-size: 2rem; margin-bottom: 14px; }
.ai-title { font-size: 1rem; font-weight: 800; color: #fff; margin-bottom: 10px; }
.ai-desc { font-size: 0.87rem; color: rgba(255,255,255,0.65); line-height: 1.7; }
.ai-desc strong { color: var(--red); }

/* ============================================
   专家展示
   ============================================ */
.experts-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 28px; }
.expert-card {
    background: #fff; border-radius: var(--radius-lg); overflow: hidden;
    box-shadow: var(--shadow); border: 1px solid var(--border); transition: all var(--trans);
    display: flex; flex-direction: column;
}
.expert-card:hover { transform: translateY(-5px); box-shadow: 0 16px 48px rgba(0,0,0,0.12); }
.expert-img-wrap { position: relative; height: 220px; overflow: hidden; background: var(--dark); }
.expert-img-wrap img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.expert-badge { position: absolute; bottom: 14px; left: 14px; padding: 5px 12px; border-radius: 50px; background: var(--red); color: #fff; font-size: 0.75rem; font-weight: 700; }
.expert-body { padding: 20px 22px; flex: 1; display: flex; flex-direction: column; }
.expert-name { font-size: 1.15rem; font-weight: 900; color: var(--text); margin-bottom: 4px; }
.expert-role { font-size: 0.85rem; color: var(--red); font-weight: 700; margin-bottom: 12px; }
.expert-bio { font-size: 0.87rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 14px; flex: 1; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.expert-tag { padding: 4px 10px; border-radius: 50px; background: #F1FAEE; border: 1px solid var(--border); font-size: 0.75rem; color: var(--text-muted); }
.expert-btns { display: flex; gap: 10px; }

/* ============================================
   用户评价
   ============================================ */
.reviews-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.review-card {
    background: #fff; border-radius: var(--radius-lg); padding: 24px;
    border: 1px solid var(--border); box-shadow: var(--shadow); transition: all var(--trans);
}
.review-card:hover { transform: translateY(-3px); box-shadow: 0 10px 32px rgba(0,0,0,0.10); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.review-avatar { width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, var(--red), var(--navy)); display: flex; align-items: center; justify-content: center; font-size: 1.1rem; font-weight: 900; color: #fff; flex-shrink: 0; }
.review-name { font-size: 0.95rem; font-weight: 700; color: var(--text); }
.review-label { font-size: 0.75rem; color: var(--text-muted); }
.review-stars { color: #F59E0B; font-size: 0.9rem; margin-left: auto; }
.review-text { font-size: 0.88rem; color: var(--text-muted); line-height: 1.75; margin-bottom: 12px; }
.review-date { font-size: 0.75rem; color: #9CA3AF; }

/* ============================================
   FAQ
   ============================================ */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: #fff; border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; transition: all var(--trans); }
.faq-item:hover { border-color: rgba(230,57,70,0.3); }
.faq-item.open { border-color: var(--red); box-shadow: 0 4px 16px var(--red-glow); }
.faq-q {
    display: flex; justify-content: space-between; align-items: center;
    padding: 18px 22px; cursor: pointer; font-size: 0.95rem; font-weight: 700; color: var(--text);
    user-select: none;
}
.faq-icon { width: 22px; height: 22px; border-radius: 50%; background: #F3F4F6; display: flex; align-items: center; justify-content: center; font-size: 1rem; color: var(--text-muted); transition: all var(--trans); flex-shrink: 0; }
.faq-item.open .faq-icon { background: var(--red); color: #fff; transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s ease; }
.faq-item.open .faq-a { max-height: 300px; }
.faq-a-inner { padding: 0 22px 18px; font-size: 0.88rem; color: var(--text-muted); line-height: 1.8; }

/* ============================================
   合作品牌
   ============================================ */
.partners-grid { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
.partner-item {
    padding: 16px 28px; border-radius: var(--radius); background: #fff;
    border: 1px solid var(--border); font-size: 1rem; font-weight: 800;
    color: var(--text-muted); transition: all var(--trans);
    display: flex; align-items: center; justify-content: center; min-width: 120px;
}
.partner-item:hover { border-color: var(--red); color: var(--red); transform: translateY(-2px); box-shadow: var(--shadow-red); }

/* ============================================
   社区数据统计
   ============================================ */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 20px; }
.stat-card {
    background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg); padding: 28px 24px; text-align: center;
    transition: all var(--trans);
}
.stat-card:hover { background: rgba(230,57,70,0.1); border-color: rgba(230,57,70,0.3); }
.stat-num { font-size: 2.2rem; font-weight: 900; color: var(--red); margin-bottom: 6px; }
.stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.6); }

/* ============================================
   联系区域
   ============================================ */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info-list { display: flex; flex-direction: column; gap: 18px; }
.contact-item { display: flex; align-items: flex-start; gap: 14px; }
.contact-icon { width: 42px; height: 42px; border-radius: 10px; background: var(--red-glow); display: flex; align-items: center; justify-content: center; font-size: 1.1rem; flex-shrink: 0; }
.contact-detail h5 { font-size: 0.85rem; font-weight: 700; color: var(--text); margin-bottom: 3px; }
.contact-detail p { font-size: 0.87rem; color: var(--text-muted); }

/* ============================================
   页脚
   ============================================ */
#site-footer { background: var(--dark); color: rgba(255,255,255,0.7); padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; max-width: 1200px; margin: 0 auto; padding: 0 20px 48px; }
.footer-brand-desc { font-size: 0.87rem; color: rgba(255,255,255,0.5); line-height: 1.8; margin: 16px 0 20px; }
.footer-social { display: flex; gap: 10px; }
.social-btn { width: 36px; height: 36px; border-radius: 8px; background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center; font-size: 0.8rem; font-weight: 700; color: rgba(255,255,255,0.6); transition: all var(--trans); }
.social-btn:hover { background: var(--red); color: #fff; }
.footer-col h4 { font-size: 0.95rem; font-weight: 800; color: #fff; margin-bottom: 18px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 0.87rem; color: rgba(255,255,255,0.5); transition: color var(--trans); }
.footer-links a:hover { color: var(--red); }
.footer-qr-wrap { display: flex; gap: 16px; }
.footer-qr-item { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.footer-qr { width: 80px; height: 80px; background: #fff; border-radius: 8px; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.footer-qr-label { font-size: 0.72rem; color: rgba(255,255,255,0.45); }
.footer-contact-info { display: flex; flex-direction: column; gap: 8px; margin-top: 14px; font-size: 0.82rem; color: rgba(255,255,255,0.45); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 20px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; max-width: 1200px; margin: 0 auto; }
.footer-copyright { font-size: 0.82rem; color: rgba(255,255,255,0.35); }
.footer-icp { font-size: 0.82rem; color: rgba(255,255,255,0.3); }
.footer-icp a { color: rgba(255,255,255,0.35); }
.footer-icp a:hover { color: var(--red); }

/* 分享按钮 */
.share-bar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.share-label { font-size: 0.85rem; color: var(--text-muted); }
.share-btn { padding: 7px 16px; border-radius: 50px; font-size: 0.82rem; font-weight: 700; border: 1.5px solid var(--border); color: var(--text-muted); transition: all var(--trans); }
.share-btn:hover { border-color: var(--red); color: var(--red); }

/* ============================================
   视频弹窗
   ============================================ */
.video-modal { position: fixed; inset: 0; z-index: 9999; background: rgba(0,0,0,0.92); display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: opacity var(--trans); }
.video-modal.active { opacity: 1; pointer-events: all; }
.video-modal-box { position: relative; width: 90%; max-width: 900px; background: var(--dark); border-radius: var(--radius-lg); overflow: hidden; }
.video-modal-close { position: absolute; top: 14px; right: 14px; z-index: 10; width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,0.15); color: #fff; font-size: 1.1rem; display: flex; align-items: center; justify-content: center; transition: all var(--trans); }
.video-modal-close:hover { background: var(--red); }
.video-modal-box video { width: 100%; display: block; }
.video-modal-info { padding: 16px 20px; background: #111; color: rgba(255,255,255,0.8); font-size: 0.9rem; }

/* Toast */
#toast { position: fixed; bottom: 32px; left: 50%; transform: translateX(-50%) translateY(20px); background: var(--dark); color: #fff; padding: 12px 24px; border-radius: 50px; font-size: 0.9rem; z-index: 9998; opacity: 0; transition: all var(--trans); border: 1px solid rgba(255,255,255,0.15); pointer-events: none; }
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============================================
   面包屑
   ============================================ */
.breadcrumb { padding: 14px 0; font-size: 0.85rem; color: var(--text-muted); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--red); }
.breadcrumb span { margin: 0 6px; }

/* ============================================
   内页 Hero
   ============================================ */
.page-hero { background: linear-gradient(135deg, var(--dark) 0%, var(--navy) 100%); padding: 60px 0 50px; }
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 900; color: #fff; margin-bottom: 10px; }
.page-hero p { font-size: 1rem; color: rgba(255,255,255,0.65); }

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .site-nav { display: none; position: fixed; top: 68px; left: 0; right: 0; background: var(--dark); flex-direction: column; padding: 20px; gap: 4px; border-bottom: 1px solid rgba(255,255,255,0.08); z-index: 999; }
    .site-nav.open { display: flex; }
    .site-nav a { padding: 12px 16px; border-radius: 8px; }
    .hamburger { display: flex; }
    .header-search { display: none; }
    .hero-h1 { font-size: 2rem; }
    .hero-stats { gap: 20px; }
    .video-grid { grid-template-columns: 1fr; }
    .feature-grid { grid-template-columns: 1fr; }
    .experts-grid { grid-template-columns: 1fr; }
    .reviews-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .section { padding: 50px 0; }
    .ai-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
    .hero-btns { flex-direction: column; }
    .stats-grid { grid-template-columns: 1fr; }
    .partners-grid { gap: 10px; }
    .partner-item { min-width: 90px; padding: 12px 16px; }
}

/* ============================================
   关于页 / 补充样式
   ============================================ */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
@media (max-width: 768px) {
    .about-grid { grid-template-columns: 1fr; gap: 32px; }
}
/* 视频分类标签按钮 */
.video-tab-btn { padding: 8px 18px; border-radius: 50px; font-size: 0.85rem; font-weight: 700; border: 1.5px solid var(--border); color: var(--text-muted); background: #fff; cursor: pointer; transition: all var(--trans); }
.video-tab-btn.active, .video-tab-btn:hover { background: var(--red); color: #fff; border-color: var(--red); }
/* 专家标签 */
.expert-tag { display: inline-block; padding: 3px 10px; border-radius: 50px; background: var(--red-glow); color: var(--red); font-size: 0.75rem; font-weight: 700; }
/* 合作品牌 */
.partners-grid { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }
.partner-item { padding: 14px 24px; border-radius: var(--radius); background: #fff; border: 1.5px solid var(--border); font-size: 0.9rem; font-weight: 700; color: var(--text); transition: all var(--trans); }
.partner-item:hover { border-color: var(--red); color: var(--red); box-shadow: var(--shadow-red); }
/* 社区统计 */
.stats-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.stat-card { text-align: center; }
.stat-num { font-size: clamp(1.4rem, 2.5vw, 2rem); font-weight: 900; color: var(--red); }
.stat-label { font-size: 0.8rem; color: rgba(255,255,255,0.55); margin-top: 4px; }
@media (max-width: 768px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
/* 评论网格 */
.reviews-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.review-card { background: #fff; border-radius: var(--radius-lg); padding: 24px; border: 1px solid var(--border); transition: all var(--trans); }
.review-card:hover { box-shadow: var(--shadow); border-color: var(--red); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.review-avatar { width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, var(--red), var(--navy)); display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 900; font-size: 1.1rem; flex-shrink: 0; }
.review-name { font-weight: 800; font-size: 0.95rem; color: var(--text); }
.review-label { font-size: 0.78rem; color: var(--text-muted); }
.review-stars { margin-left: auto; color: #F59E0B; font-size: 0.9rem; }
.review-text { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 12px; }
.review-date { font-size: 0.75rem; color: var(--border); }
/* 联系页 */
.contact-detail h5 { font-size: 0.82rem; font-weight: 700; color: var(--text-muted); margin-bottom: 3px; }
.contact-detail p { font-size: 0.92rem; color: var(--text); font-weight: 600; }
.contact-icon { width: 40px; height: 40px; border-radius: 10px; background: var(--red-glow); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; flex-shrink: 0; }
/* 专家卡片补充 */
.expert-btns { display: flex; gap: 10px; flex-wrap: wrap; }
.btn-sm { padding: 7px 16px; font-size: 0.82rem; }
.btn-outline { background: transparent; border: 2px solid var(--navy); color: var(--navy); }
.btn-outline:hover { background: var(--navy); color: #fff; }
.btn-navy { background: var(--navy); color: #fff; }
.btn-navy:hover { background: var(--navy-light); }
/* 英雄区滚动提示 */
.hero-scroll-hint { position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%); color: rgba(255,255,255,0.5); font-size: 0.8rem; animation: bounce 2s infinite; }
@keyframes bounce { 0%,100%{transform:translateX(-50%) translateY(0)} 50%{transform:translateX(-50%) translateY(-8px)} }
/* section-sm */
.section-sm { padding: 28px 0; }