/* =====================================================
   糖心vlog - 主样式文件
   品牌色: 主紫 #6B21A8 | 粉红 #EC4899 | 深色背景 #0F0A1E
   ===================================================== */

/* ---- 重置与基础 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: #0F0A1E;
  color: #E2D9F3;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: #C084FC; text-decoration: none; transition: color .25s; }
a:hover { color: #EC4899; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ---- CSS 变量 ---- */
:root {
  --purple-deep: #6B21A8;
  --purple-mid:  #9333EA;
  --purple-light:#C084FC;
  --pink:        #EC4899;
  --pink-light:  #F9A8D4;
  --gold:        #F59E0B;
  --dark-bg:     #0F0A1E;
  --dark-card:   #1A1030;
  --dark-border: #2D1B69;
  --text-main:   #E2D9F3;
  --text-muted:  #9CA3AF;
  --radius:      12px;
  --shadow:      0 8px 32px rgba(107,33,168,.35);
  --transition:  all .3s ease;
}

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #0F0A1E; }
::-webkit-scrollbar-thumb { background: var(--purple-mid); border-radius: 3px; }

/* =====================================================
   顶部导航
   ===================================================== */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(15,10,30,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--dark-border);
}
.header-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center;
  padding: 0 20px; height: 64px; gap: 24px;
}
.site-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.25rem; font-weight: 700;
  color: #fff; white-space: nowrap;
}
.site-logo img { width: 36px; height: 36px; border-radius: 8px; }
.site-logo span { background: linear-gradient(135deg,#C084FC,#EC4899); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

.main-nav { display: flex; align-items: center; gap: 4px; flex: 1; }
.main-nav a {
  padding: 6px 14px; border-radius: 8px;
  font-size: .9rem; color: var(--text-main);
  transition: var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  background: var(--dark-border);
  color: var(--purple-light);
}

/* 搜索框 */
.header-search {
  display: flex; align-items: center;
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 24px; overflow: hidden;
  transition: var(--transition);
}
.header-search:focus-within { border-color: var(--purple-mid); box-shadow: 0 0 0 3px rgba(147,51,234,.2); }
.header-search input {
  background: transparent; border: none; outline: none;
  color: var(--text-main); padding: 8px 16px;
  width: 200px; font-size: .88rem;
}
.header-search input::placeholder { color: var(--text-muted); }
.header-search button {
  background: linear-gradient(135deg,var(--purple-mid),var(--pink));
  border: none; cursor: pointer; padding: 8px 16px;
  color: #fff; font-size: .88rem;
  transition: var(--transition);
}
.header-search button:hover { opacity: .85; }

/* 汉堡菜单 */
.menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.menu-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--text-main); margin: 5px 0;
  transition: var(--transition);
}

/* 搜索栏（导航下方独立行） */
.search-bar-row {
  background: var(--dark-card);
  border-bottom: 1px solid var(--dark-border);
  padding: 10px 20px;
}
.search-bar-row .search-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; gap: 8px; align-items: center;
}
.search-bar-row input {
  flex: 1; background: var(--dark-bg);
  border: 1px solid var(--dark-border);
  border-radius: 24px; padding: 10px 20px;
  color: var(--text-main); font-size: .95rem; outline: none;
  transition: var(--transition);
}
.search-bar-row input:focus { border-color: var(--purple-mid); }
.search-bar-row button {
  background: linear-gradient(135deg,var(--purple-mid),var(--pink));
  border: none; border-radius: 24px; padding: 10px 28px;
  color: #fff; cursor: pointer; font-size: .95rem;
  transition: var(--transition);
}
.search-bar-row button:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.search-suggestions {
  display: none; position: absolute; top: 100%; left: 0; right: 0;
  background: var(--dark-card); border: 1px solid var(--dark-border);
  border-radius: 12px; margin-top: 4px; overflow: hidden; z-index: 100;
}

/* =====================================================
   Hero Banner
   ===================================================== */
.hero-banner {
  position: relative; min-height: 560px;
  display: flex; align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background-image: url('../images/banner_bg.jpg');
  background-size: cover; background-position: center;
  filter: brightness(.55) saturate(1.2);
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(107,33,168,.6) 0%, rgba(15,10,30,.8) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 1280px; margin: 0 auto; padding: 80px 20px;
  text-align: center;
}
.hero-badge {
  display: inline-block;
  background: rgba(236,72,153,.2); border: 1px solid var(--pink);
  color: var(--pink-light); padding: 4px 16px; border-radius: 20px;
  font-size: .82rem; margin-bottom: 20px; letter-spacing: .05em;
}
.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900; line-height: 1.15;
  color: #fff; margin-bottom: 20px;
}
.hero-content h1 em {
  font-style: normal;
  background: linear-gradient(135deg,#C084FC,#EC4899);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: 1.1rem; color: rgba(255,255,255,.8);
  max-width: 640px; margin: 0 auto 32px;
}
.hero-stats {
  display: flex; justify-content: center; gap: 40px;
  margin-bottom: 36px; flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 2rem; font-weight: 800;
  background: linear-gradient(135deg,#C084FC,#EC4899);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-stat .label { font-size: .8rem; color: rgba(255,255,255,.6); }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  background: linear-gradient(135deg,var(--purple-mid),var(--pink));
  color: #fff; padding: 14px 32px; border-radius: 32px;
  font-weight: 600; font-size: 1rem; border: none; cursor: pointer;
  transition: var(--transition); display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(236,72,153,.4); color: #fff; }
.btn-outline {
  background: transparent;
  border: 2px solid var(--purple-light);
  color: var(--purple-light); padding: 12px 32px; border-radius: 32px;
  font-weight: 600; font-size: 1rem; cursor: pointer;
  transition: var(--transition); display: inline-flex; align-items: center; gap: 8px;
}
.btn-outline:hover { background: var(--purple-light); color: #0F0A1E; }

/* =====================================================
   通用区块
   ===================================================== */
.section { padding: 80px 20px; }
.section-inner { max-width: 1280px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
  display: inline-block;
  background: linear-gradient(135deg,rgba(147,51,234,.2),rgba(236,72,153,.2));
  border: 1px solid var(--dark-border);
  color: var(--purple-light); padding: 4px 16px; border-radius: 20px;
  font-size: .8rem; margin-bottom: 12px; letter-spacing: .08em;
}
.section-header h2 {
  font-size: clamp(1.6rem,3vw,2.4rem);
  font-weight: 800; color: #fff; margin-bottom: 12px;
}
.section-header h2 span {
  background: linear-gradient(135deg,#C084FC,#EC4899);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.section-header p { color: var(--text-muted); font-size: 1rem; max-width: 560px; margin: 0 auto; }

/* 分隔线 */
.divider {
  width: 60px; height: 4px; margin: 16px auto 0;
  background: linear-gradient(135deg,var(--purple-mid),var(--pink));
  border-radius: 2px;
}

/* =====================================================
   视频卡片
   ===================================================== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: var(--purple-mid);
}
.video-thumb {
  position: relative; overflow: hidden;
  aspect-ratio: 16/9;
}
.video-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.play-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,.45);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity .3s;
}
.video-card:hover .play-overlay { opacity: 1; }
.play-btn {
  width: 56px; height: 56px; border-radius: 50%;
  background: linear-gradient(135deg,var(--purple-mid),var(--pink));
  display: flex; align-items: center; justify-content: center;
  transform: scale(.8); transition: transform .3s;
  box-shadow: 0 4px 20px rgba(236,72,153,.5);
}
.video-card:hover .play-btn { transform: scale(1); }
.play-btn svg { width: 22px; height: 22px; fill: #fff; margin-left: 3px; }
.video-duration {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,.75); color: #fff;
  padding: 2px 8px; border-radius: 4px; font-size: .75rem;
}
.video-info { padding: 14px 16px; }
.video-title {
  font-size: .95rem; font-weight: 600; color: #fff;
  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; align-items: center;
  font-size: .78rem; color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tag {
  display: inline-block; padding: 2px 8px; border-radius: 4px;
  font-size: .72rem; font-weight: 600;
  background: rgba(147,51,234,.2); color: var(--purple-light);
  margin-bottom: 8px;
}

/* =====================================================
   特性/功能卡片
   ===================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(135deg,var(--purple-mid),var(--pink));
  transform: scaleX(0); transform-origin: left; transition: transform .3s;
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover { border-color: var(--purple-mid); transform: translateY(-4px); }
.feature-icon {
  width: 52px; height: 52px; border-radius: 12px;
  background: linear-gradient(135deg,rgba(147,51,234,.2),rgba(236,72,153,.2));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 16px;
}
.feature-card h3 { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
.feature-card p { font-size: .875rem; color: var(--text-muted); line-height: 1.6; }

/* =====================================================
   专家卡片
   ===================================================== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}
.expert-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  overflow: hidden; transition: var(--transition);
  text-align: center;
}
.expert-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--purple-mid); }
.expert-avatar {
  width: 100%; height: 240px; object-fit: cover;
  object-position: top;
}
.expert-info { padding: 20px; }
.expert-name { font-size: 1.1rem; font-weight: 700; color: #fff; margin-bottom: 4px; }
.expert-role { font-size: .82rem; color: var(--purple-light); margin-bottom: 12px; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 16px; }
.expert-tag {
  padding: 3px 10px; border-radius: 20px; font-size: .72rem;
  background: rgba(147,51,234,.15); border: 1px solid var(--dark-border);
  color: var(--text-muted);
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  padding: 7px 16px; border-radius: 20px; font-size: .8rem;
  cursor: pointer; transition: var(--transition);
}
.btn-sm-primary {
  background: linear-gradient(135deg,var(--purple-mid),var(--pink));
  color: #fff; border: none;
}
.btn-sm-outline {
  background: transparent; border: 1px solid var(--dark-border);
  color: var(--text-muted);
}
.btn-sm-outline:hover { border-color: var(--purple-light); color: var(--purple-light); }

/* =====================================================
   评价/评论
   ===================================================== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  padding: 24px; transition: var(--transition);
}
.review-card:hover { border-color: var(--purple-mid); transform: translateY(-3px); }
.review-stars { color: var(--gold); font-size: 1rem; margin-bottom: 12px; }
.review-text { font-size: .9rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 16px; font-style: italic; }
.review-user { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg,var(--purple-mid),var(--pink));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; color: #fff; font-size: .9rem; flex-shrink: 0;
}
.review-name { font-weight: 600; color: #fff; font-size: .88rem; }
.review-date { font-size: .75rem; color: var(--text-muted); }

/* =====================================================
   FAQ
   ===================================================== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  margin-bottom: 12px; overflow: hidden;
}
.faq-question {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 24px; cursor: pointer;
  font-weight: 600; color: #fff; font-size: .95rem;
  transition: var(--transition);
}
.faq-question:hover { color: var(--purple-light); }
.faq-icon {
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--dark-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; color: var(--purple-light);
  transition: transform .3s; flex-shrink: 0;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0; overflow: hidden;
  transition: max-height .4s ease, padding .3s;
  padding: 0 24px;
}
.faq-item.open .faq-answer {
  max-height: 300px; padding: 0 24px 18px;
}
.faq-answer p { color: var(--text-muted); font-size: .9rem; line-height: 1.7; }

/* =====================================================
   社区/合作
   ===================================================== */
.partner-grid {
  display: flex; flex-wrap: wrap; gap: 16px; justify-content: center;
}
.partner-logo {
  background: var(--dark-card); border: 1px solid var(--dark-border);
  border-radius: 10px; padding: 16px 28px;
  font-weight: 700; color: var(--text-muted);
  transition: var(--transition); font-size: .9rem;
}
.partner-logo:hover { border-color: var(--purple-mid); color: var(--purple-light); }

/* 社区动物视频区 */
.community-tabs {
  display: flex; gap: 8px; margin-bottom: 28px; flex-wrap: wrap;
}
.tab-btn {
  padding: 8px 20px; border-radius: 24px;
  background: var(--dark-card); border: 1px solid var(--dark-border);
  color: var(--text-muted); cursor: pointer; font-size: .88rem;
  transition: var(--transition);
}
.tab-btn.active, .tab-btn:hover {
  background: linear-gradient(135deg,var(--purple-mid),var(--pink));
  border-color: transparent; color: #fff;
}

/* =====================================================
   联系我们
   ===================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.contact-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius); padding: 28px;
  transition: var(--transition);
}
.contact-card:hover { border-color: var(--purple-mid); }
.contact-icon { font-size: 2rem; margin-bottom: 12px; }
.contact-card h3 { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
.contact-card p { font-size: .88rem; color: var(--text-muted); line-height: 1.7; }

/* QR码区 */
.qr-row {
  display: flex; gap: 40px; justify-content: center;
  flex-wrap: wrap; margin-top: 40px;
}
.qr-item { text-align: center; }
.qr-item img { width: 140px; height: 140px; border-radius: 12px; margin: 0 auto 10px; border: 2px solid var(--dark-border); }
.qr-item p { font-size: .82rem; color: var(--text-muted); }

/* =====================================================
   分享栏
   ===================================================== */
.share-bar {
  display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
}
.share-label { font-size: .88rem; color: var(--text-muted); }
.share-btn {
  padding: 7px 18px; border-radius: 20px; font-size: .82rem;
  cursor: pointer; border: 1px solid var(--dark-border);
  color: var(--text-muted); background: var(--dark-card);
  transition: var(--transition); display: flex; align-items: center; gap: 6px;
}
.share-btn:hover { border-color: var(--purple-mid); color: var(--purple-light); }

/* =====================================================
   页脚
   ===================================================== */
.site-footer {
  background: #080512;
  border-top: 1px solid var(--dark-border);
  padding: 60px 20px 24px;
}
.footer-inner { max-width: 1280px; margin: 0 auto; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px; margin-bottom: 48px;
}
.footer-brand .site-logo { margin-bottom: 16px; font-size: 1.1rem; }
.footer-brand p { font-size: .875rem; color: var(--text-muted); line-height: 1.7; max-width: 300px; }
.footer-col h4 { font-size: .9rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: .85rem; color: var(--text-muted); transition: color .2s; }
.footer-col ul li a:hover { color: var(--purple-light); }
.footer-bottom {
  border-top: 1px solid var(--dark-border);
  padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
}
.footer-bottom p { font-size: .82rem; color: var(--text-muted); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: .82rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--purple-light); }

/* 更新时间 */
.update-time { font-size: .78rem; color: var(--text-muted); margin-top: 6px; }

/* =====================================================
   面包屑
   ===================================================== */
.breadcrumb {
  background: var(--dark-card);
  border-bottom: 1px solid var(--dark-border);
  padding: 12px 20px;
}
.breadcrumb-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; gap: 8px;
  font-size: .82rem; color: var(--text-muted);
}
.breadcrumb-inner a { color: var(--text-muted); }
.breadcrumb-inner a:hover { color: var(--purple-light); }
.breadcrumb-inner .sep { color: var(--dark-border); }
.breadcrumb-inner .current { color: var(--purple-light); }

/* =====================================================
   内页 Hero
   ===================================================== */
.page-hero {
  background: linear-gradient(135deg,rgba(107,33,168,.3),rgba(15,10,30,1));
  padding: 60px 20px;
  border-bottom: 1px solid var(--dark-border);
  text-align: center;
}
.page-hero h1 { font-size: clamp(1.8rem,4vw,2.8rem); font-weight: 800; color: #fff; margin-bottom: 12px; }
.page-hero h1 span { background: linear-gradient(135deg,#C084FC,#EC4899); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.page-hero p { color: var(--text-muted); font-size: 1rem; max-width: 600px; margin: 0 auto; }

/* =====================================================
   AI 区块
   ===================================================== */
.ai-section { background: linear-gradient(135deg,rgba(107,33,168,.1),rgba(15,10,30,1)); }
.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px; align-items: center;
}
.ai-img { border-radius: var(--radius); overflow: hidden; }
.ai-img img { width: 100%; border-radius: var(--radius); }
.ai-content h2 { font-size: clamp(1.5rem,3vw,2.2rem); font-weight: 800; color: #fff; margin-bottom: 16px; }
.ai-content h2 span { background: linear-gradient(135deg,#C084FC,#EC4899); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.ai-content p { color: var(--text-muted); margin-bottom: 24px; line-height: 1.8; }
.ai-features { display: flex; flex-direction: column; gap: 12px; margin-bottom: 28px; }
.ai-feature-item {
  display: flex; align-items: flex-start; gap: 12px;
  background: var(--dark-card); border: 1px solid var(--dark-border);
  border-radius: 10px; padding: 14px 16px;
}
.ai-feature-item .icon { font-size: 1.3rem; flex-shrink: 0; }
.ai-feature-item h4 { font-size: .9rem; font-weight: 600; color: #fff; margin-bottom: 4px; }
.ai-feature-item p { font-size: .82rem; color: var(--text-muted); margin: 0; }

/* =====================================================
   统计条
   ===================================================== */
.stats-bar {
  background: linear-gradient(135deg,var(--purple-deep),#1A1030);
  padding: 40px 20px;
}
.stats-inner {
  max-width: 1280px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4,1fr); gap: 24px;
  text-align: center;
}
.stat-item .num {
  font-size: 2.2rem; font-weight: 900;
  background: linear-gradient(135deg,#C084FC,#EC4899);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-item .label { font-size: .85rem; color: rgba(255,255,255,.6); margin-top: 4px; }

/* =====================================================
   响应式
   ===================================================== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 768px) {
  .main-nav { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: rgba(15,10,30,.98); padding: 16px; border-bottom: 1px solid var(--dark-border); }
  .main-nav.open { display: flex; }
  .menu-toggle { display: block; }
  .header-search { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 20px; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .stats-inner { grid-template-columns: repeat(2,1fr); }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .hero-content { padding: 48px 16px; }
  .section { padding: 48px 16px; }
  .video-grid { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: 1fr 1fr; }
}

/* =====================================================
   动画
   ===================================================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp .6s ease forwards; }
.fade-in-delay-1 { animation-delay: .1s; opacity: 0; }
.fade-in-delay-2 { animation-delay: .2s; opacity: 0; }
.fade-in-delay-3 { animation-delay: .3s; opacity: 0; }

/* 懒加载占位 */
img[data-src] { background: var(--dark-card); min-height: 80px; }

/* 视频模态框 */
.video-modal {
  display: none; position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,.85); align-items: center; justify-content: center;
}
.video-modal.open { display: flex; }
.modal-inner {
  background: var(--dark-card); border-radius: var(--radius);
  padding: 24px; max-width: 800px; width: 90%; position: relative;
}
.modal-close {
  position: absolute; top: 12px; right: 16px;
  background: none; border: none; color: var(--text-muted);
  font-size: 1.5rem; cursor: pointer; line-height: 1;
}
.modal-video { width: 100%; aspect-ratio: 16/9; background: #000; border-radius: 8px; }

/* =====================================================
   v2.0 补充样式 - 百度SEO EEAT优化
   ===================================================== */

/* 无障碍跳过链接 */
.skip-link {
  position: absolute; top: -100px; left: 16px;
  background: var(--purple-mid); color: #fff;
  padding: 8px 16px; border-radius: 4px;
  font-size: .88rem; z-index: 9999;
  transition: top .2s;
}
.skip-link:focus { top: 8px; }

/* 导航滚动阴影 */
.site-header.scrolled {
  box-shadow: 0 4px 24px rgba(0,0,0,.5);
}

/* 下拉导航 */
.nav-dropdown { position: relative; }
.nav-has-drop { cursor: pointer; }
.drop-arrow { font-size: .7rem; margin-left: 2px; }
.nav-drop-menu {
  display: none; position: absolute; top: calc(100% + 8px); left: 0;
  background: var(--dark-card); border: 1px solid var(--dark-border);
  border-radius: var(--radius); min-width: 180px; z-index: 200;
  box-shadow: 0 8px 32px rgba(0,0,0,.4);
  overflow: hidden;
}
.nav-drop-menu a {
  display: block; padding: 10px 18px;
  font-size: .88rem; color: var(--text-muted);
  border-bottom: 1px solid var(--dark-border);
  transition: var(--transition);
}
.nav-drop-menu a:last-child { border-bottom: none; }
.nav-drop-menu a:hover { background: var(--dark-border); color: var(--purple-light); }

/* header-actions 包装 */
.header-actions {
  display: flex; align-items: center; gap: 12px; margin-left: auto;
}

/* 搜索热搜标签 */
.search-hot-tags {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-size: .78rem; color: var(--text-muted); margin-left: 8px;
}
.search-hot-tags a {
  color: var(--text-muted); padding: 2px 10px;
  background: var(--dark-card); border: 1px solid var(--dark-border);
  border-radius: 12px; transition: var(--transition);
}
.search-hot-tags a:hover { color: var(--purple-light); border-color: var(--purple-mid); }

/* 视频模态框 H5 video 版 */
.modal-video-wrap {
  position: relative; width: 100%;
  aspect-ratio: 16/9; background: #000;
  border-radius: 8px; overflow: hidden;
}
.modal-video-el {
  width: 100%; height: 100%; display: block;
  background: #000; outline: none;
}
.modal-video-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,.55);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 16px; cursor: pointer;
  transition: opacity .3s;
}
.modal-video-overlay:hover { background: rgba(0,0,0,.45); }
.modal-play-btn { transition: transform .2s; }
.modal-play-btn:hover { transform: scale(1.1); }
.modal-video-title {
  color: #fff; font-size: .95rem; font-weight: 600;
  text-align: center; padding: 0 20px;
  text-shadow: 0 2px 8px rgba(0,0,0,.8);
}
.modal-info { padding: 12px 0 0; }
.modal-desc { font-size: .82rem; color: var(--text-muted); text-align: center; }

/* 分享栏容器 */
.share-bar {
  background: #1A1030;
  border-top: 1px solid var(--dark-border);
  padding: 16px 20px;
}
.share-bar-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.share-label { font-size: .88rem; color: var(--text-muted); }

/* 页脚徽章 */
.footer-badges {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px;
}
.footer-badge {
  font-size: .72rem; padding: 3px 10px; border-radius: 12px;
  background: rgba(147,51,234,.15); border: 1px solid var(--dark-border);
  color: var(--text-muted);
}

/* 页脚友情链接行 */
.footer-links-row {
  border-top: 1px solid var(--dark-border);
  padding: 16px 0;
  display: flex; flex-wrap: wrap; gap: 16px;
  font-size: .8rem; color: var(--text-muted);
  margin-bottom: 8px;
}
.footer-links-row a { color: var(--text-muted); }
.footer-links-row a:hover { color: var(--purple-light); }

/* 页脚法律链接 */
.footer-legal-links { display: flex; gap: 16px; flex-wrap: wrap; }
.footer-legal-links a { font-size: .8rem; color: var(--text-muted); }
.footer-legal-links a:hover { color: var(--purple-light); }
.footer-copy p { font-size: .82rem; color: var(--text-muted); }

/* 触屏 hover 效果 */
.video-card.touch-hover .play-overlay { opacity: 1; }
.video-card.touch-hover .play-btn { transform: scale(1); }

/* 内页通用 prose 文章样式 */
.prose-content {
  max-width: 800px; margin: 0 auto;
  color: var(--text-muted); line-height: 1.9;
}
.prose-content h2 {
  font-size: 1.4rem; font-weight: 700; color: #fff;
  margin: 36px 0 14px; padding-bottom: 8px;
  border-bottom: 2px solid var(--dark-border);
}
.prose-content h3 {
  font-size: 1.1rem; font-weight: 600; color: var(--purple-light);
  margin: 24px 0 10px;
}
.prose-content p { margin-bottom: 14px; }
.prose-content ul { padding-left: 20px; margin-bottom: 14px; }
.prose-content ul li { list-style: disc; margin-bottom: 6px; }
.prose-content a { color: var(--purple-light); }
.prose-content a:hover { color: var(--pink); }

/* 视频详情页 */
.video-detail-wrap {
  display: grid; grid-template-columns: 2fr 1fr; gap: 32px;
  align-items: start;
}
@media (max-width: 900px) {
  .video-detail-wrap { grid-template-columns: 1fr; }
}

/* 视频卡片 - 链接包裹版 */
.video-card-link {
  display: block; color: inherit; text-decoration: none;
}
.video-card-link:hover { color: inherit; }

/* 面包屑结构化 */
.breadcrumb ol {
  display: flex; align-items: center; gap: 8px;
  list-style: none; font-size: .82rem; color: var(--text-muted);
}
.breadcrumb ol li a { color: var(--text-muted); }
.breadcrumb ol li a:hover { color: var(--purple-light); }
.breadcrumb ol li.current { color: var(--purple-light); }
.breadcrumb ol li .sep { color: var(--dark-border); }

/* 视频页筛选标签 */
.video-filter-bar {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-bottom: 32px; align-items: center;
}
.video-filter-bar .filter-label {
  font-size: .82rem; color: var(--text-muted);
}

/* JSON-LD VideoObject 辅助隐藏元素 */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* 合作品牌增强 */
.partner-logo-link {
  display: flex; align-items: center; justify-content: center;
  background: var(--dark-card); border: 1px solid var(--dark-border);
  border-radius: 10px; padding: 16px 28px;
  font-weight: 700; color: var(--text-muted);
  transition: var(--transition); font-size: .9rem;
  text-decoration: none;
}
.partner-logo-link:hover { border-color: var(--purple-mid); color: var(--purple-light); }

/* 专家卡片按钮改为链接 */
.expert-link-btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 7px 16px; border-radius: 20px; font-size: .8rem;
  cursor: pointer; transition: var(--transition); text-decoration: none;
}
.expert-link-btn.primary {
  background: linear-gradient(135deg,var(--purple-mid),var(--pink));
  color: #fff; border: none;
}
.expert-link-btn.outline {
  background: transparent; border: 1px solid var(--dark-border);
  color: var(--text-muted);
}
.expert-link-btn.outline:hover { border-color: var(--purple-light); color: var(--purple-light); }

/* 移动端搜索热词隐藏 */
@media (max-width: 768px) {
  .search-hot-tags { display: none; }
  .nav-drop-menu { position: static; box-shadow: none; border: none; background: transparent; }
  .nav-drop-menu a { padding: 8px 28px; }
}