/* ============================================
   黑丝 - 主样式文件
   costum.cn | 原创设计 © 2025
   ============================================ */

/* CSS变量 */
:root {
  --primary: #FF4E8A;
  --primary-dark: #E03070;
  --primary-light: #FF8CB4;
  --secondary: #7B2FBE;
  --secondary-dark: #5A1F8E;
  --accent: #FF9A3C;
  --accent2: #00C9A7;
  --bg-dark: #0F0B1E;
  --bg-card: #1A1530;
  --bg-card2: #221D3A;
  --text-main: #F0EAF8;
  --text-muted: #A89BC2;
  --text-light: #D4C8E8;
  --border: rgba(255,78,138,0.2);
  --shadow: 0 8px 32px rgba(123,47,190,0.25);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --transition: 0.3s ease;
  --font-main: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
}

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

/* 容器 */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.container-sm { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* ============ 头部导航 ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15, 11, 30, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 20px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img.logo-icon {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 8px;
}
.site-logo .logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  color: var(--text-light);
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--primary);
  background: rgba(255,78,138,0.1);
}
.header-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.btn-login {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  transition: all var(--transition);
}
.btn-login:hover { background: var(--primary); color: #fff; }
.btn-join {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition);
  box-shadow: 0 4px 15px rgba(255,78,138,0.3);
}
.btn-join:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(255,78,138,0.4); }
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  padding: 4px;
}
.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============ 搜索栏 ============ */
.search-bar-wrap {
  background: rgba(26, 21, 48, 0.9);
  border-bottom: 1px solid rgba(255,78,138,0.1);
  padding: 10px 0;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  max-width: 700px;
  margin: 0 auto;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,78,138,0.25);
  border-radius: 30px;
  overflow: hidden;
  transition: border-color var(--transition);
}
.search-bar-inner:focus-within { border-color: var(--primary); }
.search-bar-inner input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-main);
  font-size: 0.9rem;
  padding: 9px 18px;
  font-family: var(--font-main);
}
.search-bar-inner input::placeholder { color: var(--text-muted); }
.search-bar-inner button {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  padding: 9px 22px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: opacity var(--transition);
}
.search-bar-inner button:hover { opacity: 0.9; }
.search-hot-tags {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 700px;
  margin: 6px auto 0;
  font-size: 0.78rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.search-hot-tags span { color: var(--text-muted); }
.search-hot-tags a {
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(255,255,255,0.05);
  transition: all var(--transition);
}
.search-hot-tags a:hover { color: var(--primary); background: rgba(255,78,138,0.1); }

/* ============ Hero区域 ============ */
.hero-section {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--bg-dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner_hero.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.45;
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,11,30,0.92) 0%, rgba(123,47,190,0.3) 60%, rgba(15,11,30,0.8) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,78,138,0.15);
  border: 1px solid rgba(255,78,138,0.4);
  color: var(--primary-light);
  font-size: 0.8rem;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 18px;
}
.hero-badge .dot {
  width: 6px; height: 6px;
  background: var(--primary);
  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-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}
.hero-title .brand { color: var(--primary); }
.hero-title .highlight {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1rem;
  color: var(--text-light);
  margin-bottom: 28px;
  max-width: 560px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  padding: 12px 28px;
  border-radius: 30px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  box-shadow: 0 6px 20px rgba(255,78,138,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(255,78,138,0.45); color: #fff; }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1.5px solid rgba(255,255,255,0.3);
  color: var(--text-main);
  padding: 12px 28px;
  border-radius: 30px;
  font-size: 0.95rem;
  transition: all var(--transition);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 36px;
  flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-item .num {
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-item .label { font-size: 0.78rem; color: var(--text-muted); margin-top: 2px; }

/* ============ 通用区块 ============ */
.section { padding: 64px 0; }
.section-sm { padding: 40px 0; }
.section-header { text-align: center; margin-bottom: 44px; }
.section-tag {
  display: inline-block;
  background: rgba(255,78,138,0.12);
  border: 1px solid rgba(255,78,138,0.3);
  color: var(--primary);
  font-size: 0.78rem;
  padding: 3px 12px;
  border-radius: 12px;
  margin-bottom: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-title .brand { color: var(--primary); }
.section-desc { color: var(--text-muted); font-size: 0.95rem; max-width: 560px; margin: 0 auto; }
.section-header-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 12px;
}
.section-header-row .section-title { margin-bottom: 0; font-size: 1.4rem; }
.view-all {
  color: var(--primary);
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}
.view-all:hover { gap: 8px; color: var(--primary); }

/* ============ 视频卡片 ============ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.video-grid-4 { grid-template-columns: repeat(4, 1fr); }
.video-grid-3 { grid-template-columns: repeat(3, 1fr); }
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  border: 1px solid rgba(255,255,255,0.05);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(255,78,138,0.2);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-card2);
}
.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); }
.play-btn-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .play-btn-overlay { opacity: 1; }
.play-btn-overlay .play-icon {
  width: 52px;
  height: 52px;
  background: rgba(255,78,138,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.85);
  transition: transform var(--transition);
  box-shadow: 0 0 20px rgba(255,78,138,0.5);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon svg { width: 20px; height: 20px; fill: #fff; margin-left: 3px; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: 4px;
}
.video-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.badge-hot { background: var(--primary); color: #fff; }
.badge-new { background: var(--accent2); color: #fff; }
.badge-hd { background: var(--accent); color: #fff; }
.video-info { padding: 14px; }
.video-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.video-meta .author { display: flex; align-items: center; gap: 5px; }
.video-meta .author img {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  object-fit: cover;
}
.video-stats { display: flex; gap: 10px; }
.video-stats span { display: flex; align-items: center; gap: 3px; }

/* ============ 分类导航标签 ============ */
.category-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.tab-btn {
  padding: 7px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text-muted);
  transition: all var(--transition);
}
.tab-btn:hover, .tab-btn.active {
  background: rgba(255,78,138,0.15);
  border-color: var(--primary);
  color: var(--primary);
}

/* ============ 专家展示 ============ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px 18px;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.05);
  transition: all var(--transition);
}
.expert-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,78,138,0.2);
  box-shadow: var(--shadow);
}
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
  overflow: hidden;
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.expert-name { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.expert-role { font-size: 0.8rem; color: var(--primary); margin-bottom: 8px; }
.expert-desc { font-size: 0.8rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 14px; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 5px; justify-content: center; margin-bottom: 14px; }
.expert-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(123,47,190,0.2);
  color: var(--primary-light);
  border: 1px solid rgba(123,47,190,0.3);
}
.expert-actions { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  font-size: 0.78rem;
  padding: 5px 12px;
  border-radius: 16px;
  transition: all var(--transition);
}
.btn-sm-primary {
  background: var(--primary);
  color: #fff;
}
.btn-sm-outline {
  border: 1px solid var(--primary);
  color: var(--primary);
}
.btn-sm-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-sm-outline:hover { background: rgba(255,78,138,0.1); }

/* ============ FAQ ============ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.open { border-color: rgba(255,78,138,0.3); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  transition: color var(--transition);
  gap: 12px;
}
.faq-question:hover { color: var(--primary); }
.faq-item.open .faq-question { color: var(--primary); }
.faq-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255,78,138,0.1);
  border: 1px solid rgba(255,78,138,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition), background var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); }
.faq-icon svg { width: 12px; height: 12px; fill: var(--primary); }
.faq-item.open .faq-icon svg { fill: #fff; }
.faq-answer {
  display: none;
  padding: 0 22px 18px;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer { display: block; }

/* ============ 用户评论 ============ */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 22px;
  border: 1px solid rgba(255,255,255,0.05);
  transition: all var(--transition);
}
.review-card:hover {
  border-color: rgba(255,78,138,0.2);
  transform: translateY(-2px);
}
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-user-info .name { font-size: 0.9rem; font-weight: 600; }
.review-user-info .date { font-size: 0.75rem; color: var(--text-muted); }
.review-stars { display: flex; gap: 2px; margin-bottom: 10px; }
.review-stars .star { color: var(--accent); font-size: 0.9rem; }
.review-text { font-size: 0.85rem; color: var(--text-light); line-height: 1.7; }
.review-tag {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(255,78,138,0.1);
  color: var(--primary-light);
}

/* ============ 合作品牌 ============ */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: all var(--transition);
  white-space: nowrap;
}
.partner-item:hover {
  border-color: rgba(255,78,138,0.3);
  color: var(--primary-light);
  background: rgba(255,78,138,0.05);
}

/* ============ 功能特性 ============ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.05);
  transition: all var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,78,138,0.2);
  box-shadow: var(--shadow);
}
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
}
.feature-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; }
.feature-desc { font-size: 0.8rem; color: var(--text-muted); line-height: 1.6; }

/* ============ 联系/社区 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.contact-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 22px;
  border: 1px solid rgba(255,255,255,0.06);
  transition: all var(--transition);
}
.contact-card:hover { border-color: rgba(255,78,138,0.25); }
.contact-card .icon { font-size: 2rem; margin-bottom: 12px; }
.contact-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.contact-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; }
.qr-wrap { text-align: center; margin-top: 14px; }
.qr-wrap img {
  width: 120px;
  height: 120px;
  border-radius: 8px;
  margin: 0 auto 6px;
  border: 2px solid rgba(255,78,138,0.2);
}
.qr-wrap p { font-size: 0.75rem; color: var(--text-muted); }

/* ============ 分享按钮 ============ */
.share-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.share-bar .label { font-size: 0.85rem; color: var(--text-muted); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  transition: all var(--transition);
  border: 1px solid transparent;
}
.share-wechat { background: rgba(9,187,7,0.15); color: #09BB07; border-color: rgba(9,187,7,0.3); }
.share-weibo { background: rgba(230,22,45,0.12); color: #E6162D; border-color: rgba(230,22,45,0.3); }
.share-douyin { background: rgba(0,0,0,0.3); color: #fff; border-color: rgba(255,255,255,0.15); }
.share-bilibili { background: rgba(0,161,214,0.12); color: #00A1D6; border-color: rgba(0,161,214,0.3); }
.share-btn:hover { transform: translateY(-1px); opacity: 0.85; }

/* ============ 面包屑 ============ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 14px 0;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: rgba(255,255,255,0.2); }
.breadcrumb .current { color: var(--text-light); }

/* ============ 底部 ============ */
#site-footer {
  background: #080614;
  border-top: 1px solid rgba(255,78,138,0.1);
  padding: 56px 0 24px;
  margin-top: 80px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo-text {
  font-size: 1.3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.footer-brand p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: all var(--transition);
}
.social-icon:hover { background: rgba(255,78,138,0.15); border-color: var(--primary); color: var(--primary); }
.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 0.83rem; color: var(--text-muted); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }
.footer-qr-row {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.footer-qr-item { text-align: center; }
.footer-qr-item img {
  width: 90px;
  height: 90px;
  border-radius: 8px;
  border: 1px solid rgba(255,78,138,0.2);
  margin-bottom: 6px;
}
.footer-qr-item p { font-size: 0.72rem; color: var(--text-muted); }

/* ============ 背景装饰 ============ */
.bg-section-alt { background: rgba(26,21,48,0.5); }
.bg-gradient-section {
  background: linear-gradient(180deg, var(--bg-dark) 0%, rgba(26,21,48,0.8) 50%, var(--bg-dark) 100%);
}
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,78,138,0.3), transparent);
  margin: 0;
}

/* ============ 标签/徽章 ============ */
.tag {
  display: inline-block;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}
.tag-pink { background: rgba(255,78,138,0.15); color: var(--primary); border: 1px solid rgba(255,78,138,0.3); }
.tag-purple { background: rgba(123,47,190,0.15); color: #b47aff; border: 1px solid rgba(123,47,190,0.3); }
.tag-teal { background: rgba(0,201,167,0.12); color: var(--accent2); border: 1px solid rgba(0,201,167,0.3); }
.tag-orange { background: rgba(255,154,60,0.12); color: var(--accent); border: 1px solid rgba(255,154,60,0.3); }

/* ============ 加入社区CTA ============ */
.cta-section {
  background: linear-gradient(135deg, rgba(255,78,138,0.12) 0%, rgba(123,47,190,0.15) 100%);
  border: 1px solid rgba(255,78,138,0.2);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
}
.cta-section h2 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; margin-bottom: 14px; }
.cta-section p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 28px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ============ 滚动动画 ============ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ============ 响应式 ============ */
@media (max-width: 1100px) {
  .video-grid-4 { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .video-grid-4, .video-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-section { min-height: 400px; }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(15,11,30,0.98);
    padding: 16px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
  }
  .mobile-menu-btn { display: flex; }
  .header-actions .btn-login { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .hero-stats { gap: 20px; }
  .cta-section { padding: 36px 20px; }
}
@media (max-width: 540px) {
  .video-grid, .video-grid-4, .video-grid-3 { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: 1fr; }
  .container { padding: 0 14px; }
}
@media (max-width: 380px) {
  .video-grid, .video-grid-4, .video-grid-3 { grid-template-columns: 1fr; }
}

/* ============ 内页专用 ============ */
.page-hero {
  background: linear-gradient(135deg, rgba(255,78,138,0.1) 0%, rgba(123,47,190,0.15) 100%);
  border-bottom: 1px solid rgba(255,78,138,0.15);
  padding: 40px 0 32px;
}
.page-hero h1 { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 800; margin-bottom: 8px; }
.page-hero p { color: var(--text-muted); font-size: 0.95rem; }

/* ============ 加载更多 ============ */
.load-more-wrap { text-align: center; margin-top: 36px; }
.btn-load-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--text-light);
  padding: 11px 32px;
  border-radius: 30px;
  font-size: 0.9rem;
  transition: all var(--transition);
}
.btn-load-more:hover { border-color: var(--primary); color: var(--primary); background: rgba(255,78,138,0.05); }

/* ============ 直播标识 ============ */
.live-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #E6162D;
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}
.live-badge::before {
  content: '';
  width: 5px;
  height: 5px;
  background: #fff;
  border-radius: 50%;
  animation: pulse 1s infinite;
}

/* ============ 视频播放模态框 ============ */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal-box {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  max-width: 800px;
  width: 100%;
  overflow: hidden;
  border: 1px solid rgba(255,78,138,0.2);
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.modal-header h3 { font-size: 0.95rem; font-weight: 600; }
.modal-close {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  color: var(--text-muted);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.modal-close:hover { background: rgba(255,78,138,0.2); color: var(--primary); }
.modal-video {
  aspect-ratio: 16/9;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.modal-video-placeholder {
  text-align: center;
}
.modal-video-placeholder .big-play {
  width: 72px;
  height: 72px;
  background: rgba(255,78,138,0.2);
  border: 2px solid var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  font-size: 1.8rem;
}

/* ============ 滚动条 ============ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: rgba(255,78,138,0.3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,78,138,0.5); }

/* ============ 选中文字 ============ */
::selection { background: rgba(255,78,138,0.3); color: var(--text-main); }