/* =============================================
   男同视频 - 主样式文件
   Brand: 男同视频 | Domain: bsdj0a.cn
   ============================================= */

/* === CSS变量 === */
:root {
  --primary: #6B21A8;
  --primary-dark: #4C1D95;
  --primary-light: #9333EA;
  --accent: #EC4899;
  --accent-light: #F472B6;
  --blue: #2563EB;
  --blue-light: #60A5FA;
  --dark: #0F0A1E;
  --dark-2: #1A1033;
  --dark-3: #241545;
  --card-bg: #1E1040;
  --text: #E2D9F3;
  --text-muted: #9D8EC0;
  --border: #3B2D6B;
  --gradient-main: linear-gradient(135deg, #6B21A8 0%, #2563EB 100%);
  --gradient-accent: linear-gradient(135deg, #EC4899 0%, #9333EA 100%);
  --gradient-dark: linear-gradient(180deg, #0F0A1E 0%, #1A1033 100%);
  --shadow: 0 4px 24px rgba(107,33,168,0.3);
  --shadow-lg: 0 8px 40px rgba(107,33,168,0.4);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s ease;
}

/* === 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', '微软雅黑', 'Helvetica Neue', Arial, sans-serif;
  background: var(--dark);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--accent-light); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; outline: none; }

/* === 滚动条 === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark-2); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* === 通用工具类 === */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }
.text-center { text-align: center; }
.text-gradient {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.text-gradient-accent {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.5px;
}
.badge-primary { background: rgba(107,33,168,0.3); color: var(--primary-light); border: 1px solid var(--primary); }
.badge-accent { background: rgba(236,72,153,0.2); color: var(--accent-light); border: 1px solid var(--accent); }
.badge-blue { background: rgba(37,99,235,0.2); color: var(--blue-light); border: 1px solid var(--blue); }

/* === 按钮 === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}
.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 4px 20px rgba(107,33,168,0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(107,33,168,0.6);
  color: #fff;
}
.btn-accent {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(236,72,153,0.4);
}
.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(236,72,153,0.6);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--primary-light);
  color: var(--primary-light);
  background: rgba(107,33,168,0.1);
}
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* === 节标题 === */
.section-header { margin-bottom: 50px; }
.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(107,33,168,0.2);
  border: 1px solid var(--primary);
  border-radius: 20px;
  font-size: 13px;
  color: var(--primary-light);
  margin-bottom: 16px;
  letter-spacing: 1px;
}
.section-title {
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}
.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
}
.section-header.text-center .section-desc { margin: 0 auto; }

/* === 分割线 === */
.divider {
  width: 60px;
  height: 4px;
  background: var(--gradient-main);
  border-radius: 2px;
  margin: 16px 0;
}
.divider-center { margin: 16px auto; }

/* =============================================
   顶部公告栏
   ============================================= */
.top-bar {
  background: var(--gradient-main);
  padding: 8px 0;
  font-size: 13px;
  text-align: center;
  color: rgba(255,255,255,0.9);
}
.top-bar a { color: #fff; font-weight: 600; }
.top-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.top-bar-links { display: flex; gap: 20px; }
.top-bar-links a { color: rgba(255,255,255,0.85); font-size: 12px; }
.top-bar-links a:hover { color: #fff; }

/* =============================================
   导航栏
   ============================================= */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15,10,30,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(107,33,168,0.3);
  padding: 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: 20px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-logo img.logo-img {
  height: 44px;
  width: auto;
}
.nav-logo .logo-text {
  font-size: 20px;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.nav-item { position: relative; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: 8px;
  white-space: nowrap;
  transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: #fff;
  background: rgba(107,33,168,0.2);
}
.nav-link .arrow { font-size: 10px; transition: var(--transition); }
.nav-item:hover .arrow { transform: rotate(180deg); }
/* 下拉菜单 */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 180px;
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
  z-index: 100;
}
.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  top: 100%;
}
.nav-dropdown a {
  display: block;
  padding: 8px 14px;
  font-size: 13px;
  color: var(--text-muted);
  border-radius: 6px;
  transition: var(--transition);
}
.nav-dropdown a:hover {
  background: rgba(107,33,168,0.2);
  color: var(--primary-light);
}
/* 搜索框 */
.nav-search {
  position: relative;
  flex-shrink: 0;
}
.nav-search input {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 8px 16px 8px 38px;
  font-size: 13px;
  color: var(--text);
  width: 200px;
  transition: var(--transition);
  outline: none;
}
.nav-search input::placeholder { color: var(--text-muted); }
.nav-search input:focus {
  border-color: var(--primary);
  background: rgba(107,33,168,0.1);
  width: 240px;
}
.nav-search .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 14px;
  pointer-events: none;
}
.nav-search .search-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--gradient-main);
  border: none;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 11px;
  color: #fff;
}
/* 汉堡菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* =============================================
   Hero Banner
   ============================================= */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner-hero.jpg');
  background-size: cover;
  background-position: center;
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(15,10,30,0.92) 0%, rgba(15,10,30,0.7) 50%, rgba(15,10,30,0.4) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  padding: 80px 0;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(236,72,153,0.15);
  border: 1px solid rgba(236,72,153,0.4);
  border-radius: 20px;
  font-size: 13px;
  color: var(--accent-light);
  margin-bottom: 20px;
}
.hero-tag .dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.hero h1 {
  font-size: clamp(32px, 5vw, 60px);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  color: #fff;
}
.hero h1 .highlight {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 16px;
  color: rgba(255,255,255,0.75);
  margin-bottom: 32px;
  max-width: 520px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 28px;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}
.hero-stat .label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* =============================================
   视频卡片
   ============================================= */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--dark-3);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(236,72,153,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 20px;
  padding-left: 4px;
  box-shadow: 0 0 30px rgba(236,72,153,0.6);
  transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1.1); }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
}
.video-tag-badge {
  position: absolute;
  top: 8px;
  left: 8px;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}
.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}
.video-meta-left { display: flex; align-items: center; gap: 12px; }
.video-stat { display: flex; align-items: center; gap: 4px; }
.video-author { display: flex; align-items: center; gap: 6px; margin-top: 10px; }
.video-author-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
}
.video-author-name { font-size: 12px; color: var(--text-muted); }

/* =============================================
   特色卡片
   ============================================= */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-main);
  transform: scaleX(0);
  transition: var(--transition);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--primary);
}
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(107,33,168,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
  border: 1px solid rgba(107,33,168,0.3);
}
.feature-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: #fff;
}
.feature-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* =============================================
   专家卡片
   ============================================= */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}
.expert-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  text-align: center;
}
.expert-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}
.expert-img-wrap {
  position: relative;
  height: 220px;
  overflow: hidden;
}
.expert-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.expert-card:hover .expert-img-wrap img { transform: scale(1.05); }
.expert-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(15,10,30,0.9) 0%, transparent 60%);
}
.expert-body { padding: 20px; }
.expert-name {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}
.expert-role {
  font-size: 13px;
  color: var(--primary-light);
  margin-bottom: 12px;
}
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 16px; }
.expert-tag {
  font-size: 11px;
  padding: 3px 10px;
  background: rgba(107,33,168,0.2);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-muted);
}
.expert-actions { display: flex; gap: 10px; justify-content: center; }
.expert-social { display: flex; gap: 10px; justify-content: center; margin-top: 12px; }
.expert-social a {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
}
.expert-social a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* =============================================
   评论/口碑
   ============================================= */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
  position: relative;
}
.review-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
}
.review-quote {
  font-size: 40px;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 12px;
  font-family: Georgia, serif;
}
.review-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-size: 14px; font-weight: 600; color: #fff; }
.review-meta { font-size: 12px; color: var(--text-muted); }
.review-stars { color: #FBBF24; font-size: 13px; margin-top: 2px; }

/* =============================================
   FAQ
   ============================================= */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: var(--primary); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  transition: var(--transition);
  gap: 16px;
}
.faq-question:hover { color: var(--primary-light); }
.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(107,33,168,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--primary-light);
  flex-shrink: 0;
  transition: var(--transition);
}
.faq-item.open .faq-icon { background: var(--primary); color: #fff; transform: rotate(45deg); }
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* =============================================
   合作品牌Logo墙
   ============================================= */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
  min-width: 120px;
  text-align: center;
}
.partner-item:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(107,33,168,0.1);
  transform: translateY(-2px);
}

/* =============================================
   联系我们
   ============================================= */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  transition: var(--transition);
}
.contact-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}
.contact-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin: 0 auto 16px;
  box-shadow: 0 4px 20px rgba(107,33,168,0.4);
}
.contact-label { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.contact-value { font-size: 14px; color: var(--text-muted); }
.qr-wrap { text-align: center; }
.qr-wrap img { width: 140px; height: auto; border-radius: 8px; margin: 0 auto 8px; }
.qr-label { font-size: 12px; color: var(--text-muted); }

/* =============================================
   社区模块
   ============================================= */
.community-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.community-tab {
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 500;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}
.community-tab.active, .community-tab:hover {
  background: var(--gradient-main);
  border-color: transparent;
  color: #fff;
}

/* =============================================
   AI赋能模块
   ============================================= */
.ai-section {
  background: linear-gradient(135deg, rgba(107,33,168,0.1) 0%, rgba(37,99,235,0.1) 100%);
  border-top: 1px solid rgba(107,33,168,0.2);
  border-bottom: 1px solid rgba(107,33,168,0.2);
}
.ai-feature-list { display: flex; flex-direction: column; gap: 16px; }
.ai-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}
.ai-feature-item:hover {
  border-color: var(--primary);
  background: rgba(107,33,168,0.1);
}
.ai-feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.ai-feature-title { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 4px; }
.ai-feature-desc { font-size: 13px; color: var(--text-muted); }

/* =============================================
   分享按钮
   ============================================= */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 14px; color: var(--text-muted); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}
.share-btn:hover { transform: translateY(-2px); }
.share-btn.weixin:hover { background: #07C160; border-color: #07C160; color: #fff; }
.share-btn.weibo:hover { background: #E6162D; border-color: #E6162D; color: #fff; }
.share-btn.douyin:hover { background: #010101; border-color: #69C9D0; color: #69C9D0; }
.share-btn.bilibili:hover { background: #00A1D6; border-color: #00A1D6; color: #fff; }
.share-btn.qq:hover { background: #12B7F5; border-color: #12B7F5; color: #fff; }

/* =============================================
   页脚
   ============================================= */
.footer {
  background: var(--dark-2);
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo-text {
  font-size: 22px;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.footer-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-social a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}
.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}
.footer-links a:hover { color: var(--primary-light); padding-left: 4px; }
.footer-qr-row {
  display: flex;
  gap: 24px;
  margin-top: 20px;
}
.footer-qr { text-align: center; }
.footer-qr img { width: 90px; height: 90px; border-radius: 8px; margin-bottom: 6px; }
.footer-qr span { font-size: 11px; color: var(--text-muted); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary-light); }
.footer-bottom-links { display: flex; gap: 16px; }

/* =============================================
   面包屑
   ============================================= */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  padding: 16px 0;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary-light); }
.breadcrumb .sep { color: var(--border); }
.breadcrumb .current { color: var(--primary-light); }

/* =============================================
   页面头部横幅（内页）
   ============================================= */
.page-hero {
  position: relative;
  padding: 60px 0;
  overflow: hidden;
  background: var(--dark-2);
  border-bottom: 1px solid var(--border);
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(107,33,168,0.2) 0%, transparent 70%);
  pointer-events: none;
}
.page-hero-title {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}
.page-hero-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
}

/* =============================================
   侧边栏
   ============================================= */
.sidebar-widget {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}
.widget-title {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.widget-title::before {
  content: '';
  width: 4px;
  height: 16px;
  background: var(--gradient-main);
  border-radius: 2px;
  display: inline-block;
}
.hot-list { display: flex; flex-direction: column; gap: 12px; }
.hot-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px;
  border-radius: 8px;
  transition: var(--transition);
  cursor: pointer;
}
.hot-item:hover { background: rgba(107,33,168,0.1); }
.hot-rank {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}
.hot-rank.r1 { background: #EF4444; color: #fff; }
.hot-rank.r2 { background: #F97316; color: #fff; }
.hot-rank.r3 { background: #EAB308; color: #fff; }
.hot-rank.rn { background: var(--dark-3); color: var(--text-muted); }
.hot-title { font-size: 13px; color: var(--text); flex: 1; }
.hot-views { font-size: 11px; color: var(--text-muted); }

/* =============================================
   加载动画
   ============================================= */
.skeleton {
  background: linear-gradient(90deg, var(--dark-3) 25%, var(--dark-2) 50%, var(--dark-3) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 6px;
}
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* =============================================
   统计数字
   ============================================= */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
}
.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  transition: var(--transition);
}
.stat-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}
.stat-num {
  font-size: 36px;
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
  margin-bottom: 6px;
}
.stat-label { font-size: 14px; color: var(--text-muted); }

/* =============================================
   标签云
   ============================================= */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 12px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}
.tag-item:hover {
  background: rgba(107,33,168,0.2);
  border-color: var(--primary);
  color: var(--primary-light);
}

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-search input { width: 160px; }
}

@media (max-width: 768px) {
  .section { padding: 50px 0; }
  .nav-menu, .nav-search { display: none; }
  .nav-toggle { display: flex; }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15,10,30,0.98);
    padding: 20px;
    overflow-y: auto;
    z-index: 999;
    gap: 4px;
  }
  .nav-menu.open .nav-search {
    display: block;
    margin: 12px 0;
  }
  .nav-menu.open .nav-search input { width: 100%; }
  .nav-dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    background: rgba(255,255,255,0.03);
    margin-top: 4px;
    display: none;
  }
  .nav-item.open .nav-dropdown { display: block; }
  .hero { min-height: 480px; }
  .hero-content { padding: 50px 0; }
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .top-bar-inner { flex-direction: column; gap: 4px; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .expert-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 28px; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .video-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .share-bar { gap: 8px; }
  .share-btn { padding: 6px 12px; font-size: 12px; }
}

/* =============================================
   动画
   ============================================= */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}
.animate-fade-up { animation: fadeInUp 0.6s ease forwards; }
.animate-fade { animation: fadeIn 0.6s ease forwards; }

/* =============================================
   辅助样式
   ============================================= */
.glow-text {
  text-shadow: 0 0 20px rgba(236,72,153,0.5);
}
.bg-dark-card { background: var(--card-bg); }
.border-gradient {
  border: 1px solid transparent;
  background-clip: padding-box;
  position: relative;
}
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.w-full { width: 100%; }
.hidden { display: none !important; }
.relative { position: relative; }
.overflow-hidden { overflow: hidden; }
.rounded { border-radius: var(--radius); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: 50px; }

/* =============================================
   无障碍跳转链接
   ============================================= */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: 0 0 8px 0;
  font-size: 14px;
  z-index: 99999;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; }

/* =============================================
   导航Logo：favicon小图标 + 品牌Logo图片
   ============================================= */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}
.logo-favicon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  flex-shrink: 0;
}
.logo-main {
  height: 44px;
  width: auto;
  max-width: 120px;
  object-fit: contain;
  flex-shrink: 0;
}
@media (max-width: 480px) {
  .logo-main { display: none; }
}

/* =============================================
   导航栏滚动效果
   ============================================= */
.navbar.scrolled {
  box-shadow: 0 4px 30px rgba(0,0,0,0.6);
  background: rgba(15,10,30,0.98);
}

/* =============================================
   面包屑导航（独立nav区域）
   ============================================= */
.breadcrumb-nav {
  background: var(--dark-2);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.breadcrumb-nav .breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-muted);
  list-style: none;
  padding: 0;
  margin: 0;
}
.breadcrumb-nav .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb-nav .breadcrumb li::before {
  content: '›';
  color: var(--border);
}
.breadcrumb-nav .breadcrumb li:first-child::before { display: none; }
.breadcrumb-nav .breadcrumb a {
  color: var(--text-muted);
  transition: var(--transition);
}
.breadcrumb-nav .breadcrumb a:hover { color: var(--primary-light); }
.breadcrumb-nav .breadcrumb li:last-child span { color: var(--primary-light); }

/* =============================================
   导航下拉菜单（has-dropdown）
   ============================================= */
.nav-item.has-dropdown { position: relative; }
.nav-item.has-dropdown .nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 200px;
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.25s, transform 0.25s, visibility 0.25s;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
}
.nav-item.has-dropdown:hover .nav-dropdown,
.nav-item.has-dropdown.open .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dropdown .dropdown-item {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
}
.nav-dropdown .dropdown-item:hover {
  background: rgba(107,33,168,0.15);
  color: var(--primary-light);
}

/* =============================================
   页脚Logo展示区
   ============================================= */
.footer-logo-bar {
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

/* =============================================
   搜索框聚焦效果
   ============================================= */
.nav-search.focused input,
.nav-search input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(107,33,168,0.2);
}

/* =============================================
   视频标签徽章定位
   ============================================= */
.video-tag-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  font-size: 11px;
  padding: 3px 10px;
}

/* =============================================
   移动端响应式补充
   ============================================= */
@media (max-width: 900px) {
  .nav-menu { display: none; }
  .nav-search { display: none; }
  .nav-toggle { display: flex; }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15,10,30,0.98);
    padding: 20px;
    overflow-y: auto;
    z-index: 999;
    gap: 4px;
  }
  .nav-item.has-dropdown .nav-dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    background: rgba(255,255,255,0.03);
    margin-top: 4px;
    display: none;
    border: none;
  }
  .nav-item.has-dropdown.open .nav-dropdown { display: block; }
}