/* ===================================================
   海角 TangXin - 主样式文件
   btmmlv.cn | 影视传媒 & 视频社区
   =================================================== */

/* ---- CSS变量 ---- */
:root {
  --primary: #E8336D;
  --primary-dark: #c0255a;
  --secondary: #F5A623;
  --accent: #9B59B6;
  --dark: #1a1a2e;
  --dark2: #16213e;
  --dark3: #0f3460;
  --text: #333344;
  --text-light: #666677;
  --bg: #f9f9fc;
  --bg2: #ffffff;
  --border: #e8e8f0;
  --radius: 12px;
  --radius-sm: 6px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 30px rgba(232,51,109,0.2);
  --transition: all 0.3s ease;
  --gradient: linear-gradient(135deg, #E8336D, #F5A623);
  --gradient-dark: linear-gradient(135deg, #1a1a2e, #0f3460);
}

/* ---- 重置 & 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', 'Hiragino Sans GB', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; outline: none; }

/* ---- 工具类 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 70px 0; }
.section-alt { background: var(--bg2); }
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.hidden { display: none !important; }

/* ---- 标题样式 ---- */
.section-header { text-align: center; margin-bottom: 50px; }
.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}
.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--gradient);
  border-radius: 2px;
}
.section-header p { color: var(--text-light); font-size: 1rem; margin-top: 16px; }

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 15px rgba(232,51,109,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(232,51,109,0.4);
  color: #fff;
}
.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
  background: transparent;
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }
.btn-dark {
  background: var(--dark);
  color: #fff;
}
.btn-dark:hover { background: var(--dark3); color: #fff; }

/* ---- 顶部公告栏 ---- */
.top-bar {
  background: var(--gradient-dark);
  color: rgba(255,255,255,0.85);
  font-size: 0.8rem;
  padding: 6px 0;
  text-align: center;
}
.top-bar a { color: var(--secondary); }

/* ---- 导航栏 ---- */
.navbar {
  background: #fff;
  box-shadow: 0 2px 15px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}
.navbar.scrolled { box-shadow: 0 4px 20px rgba(0,0,0,0.12); }
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.nav-logo img {
  height: 42px;
  width: auto;
}
.nav-logo .brand-name {
  font-size: 1.4rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-menu a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--primary);
  background: rgba(232,51,109,0.06);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 4px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- 搜索框 ---- */
.search-bar {
  background: linear-gradient(135deg, #f8f0ff, #fff0f5);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.search-inner {
  display: flex;
  align-items: center;
  max-width: 600px;
  margin: 0 auto;
  background: #fff;
  border-radius: 50px;
  border: 2px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
}
.search-inner:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232,51,109,0.1);
}
.search-inner input {
  flex: 1;
  padding: 10px 20px;
  border: none;
  outline: none;
  font-size: 0.95rem;
  color: var(--text);
  background: transparent;
}
.search-inner button {
  padding: 10px 24px;
  background: var(--gradient);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 0 50px 50px 0;
  transition: var(--transition);
}
.search-inner button:hover { opacity: 0.9; }

/* ---- 面包屑 ---- */
.breadcrumb {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
}
.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-light);
}
.breadcrumb ol li a { color: var(--text-light); }
.breadcrumb ol li a:hover { color: var(--primary); }
.breadcrumb ol li.active { color: var(--primary); }
.breadcrumb ol li:not(:last-child)::after {
  content: '›';
  margin-left: 8px;
  color: var(--border);
}

/* ---- 英雄区 ---- */
.hero {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--gradient-dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero-banner.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.35;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.9) 0%, rgba(15,52,96,0.7) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 650px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(232,51,109,0.2);
  border: 1px solid rgba(232,51,109,0.4);
  color: #ff6b9d;
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 16px;
}
.hero h1 span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  color: rgba(255,255,255,0.8);
  font-size: 1.1rem;
  margin-bottom: 30px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.hero-stat .num {
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat .label { font-size: 0.8rem; color: rgba(255,255,255,0.6); margin-top: 2px; }

/* ---- 视频卡片 ---- */
.video-card {
  background: var(--bg2);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--dark);
}
.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(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent var(--primary);
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--gradient);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}
.video-info { padding: 14px; }
.video-info h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 8px;
  line-height: 1.4;
  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: 0.8rem;
  color: var(--text-light);
}
.video-stats { display: flex; gap: 12px; }
.video-stats span { display: flex; align-items: center; gap: 4px; }

/* ---- 分类标签 ---- */
.category-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.tab-btn {
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 2px solid var(--border);
  color: var(--text-light);
  background: var(--bg2);
  transition: var(--transition);
  cursor: pointer;
}
.tab-btn:hover, .tab-btn.active {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(232,51,109,0.05);
}

/* ---- 功能卡片 ---- */
.feature-card {
  background: var(--bg2);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(232,51,109,0.2);
}
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(232,51,109,0.1), rgba(245,166,35,0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 16px;
}
.feature-card h3 { font-size: 1.05rem; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.feature-card p { font-size: 0.88rem; color: var(--text-light); line-height: 1.7; }

/* ---- 专家卡片 ---- */
.expert-card {
  background: var(--bg2);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.expert-avatar {
  width: 100%;
  aspect-ratio: 1;
  overflow: hidden;
}
.expert-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.expert-card:hover .expert-avatar img { transform: scale(1.05); }
.expert-info { padding: 20px; }
.expert-info h3 { font-size: 1.05rem; font-weight: 700; color: var(--dark); margin-bottom: 4px; }
.expert-title { font-size: 0.82rem; color: var(--primary); font-weight: 600; margin-bottom: 10px; }
.expert-desc { font-size: 0.85rem; color: var(--text-light); line-height: 1.6; margin-bottom: 14px; }
.expert-actions { display: flex; gap: 8px; justify-content: center; }

/* ---- 评价卡片 ---- */
.review-card {
  background: var(--bg2);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
  transition: var(--transition);
}
.review-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.review-stars { color: var(--secondary); font-size: 0.9rem; margin-bottom: 10px; }
.review-text { font-size: 0.9rem; color: var(--text); line-height: 1.7; margin-bottom: 14px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
}
.review-name { font-size: 0.88rem; font-weight: 600; color: var(--dark); }
.review-date { font-size: 0.78rem; color: var(--text-light); }

/* ---- FAQ ---- */
.faq-item {
  background: var(--bg2);
  border-radius: var(--radius);
  margin-bottom: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(232,51,109,0.3); }
.faq-question {
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--dark);
  user-select: none;
}
.faq-question:hover { color: var(--primary); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(232,51,109,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); color: #fff; }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}
.faq-answer-inner {
  padding: 0 24px 18px;
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.8;
}

/* ---- 合作品牌 ---- */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-light);
  transition: var(--transition);
  min-width: 120px;
  text-align: center;
}
.partner-item:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* ---- 联系区域 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info h3 { font-size: 1.3rem; font-weight: 700; color: var(--dark); margin-bottom: 20px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}
.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(232,51,109,0.1), rgba(245,166,35,0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.contact-item .label { font-size: 0.8rem; color: var(--text-light); margin-bottom: 2px; }
.contact-item .value { font-size: 0.95rem; font-weight: 600; color: var(--dark); }
.qr-codes { display: flex; gap: 24px; justify-content: center; }
.qr-item { text-align: center; }
.qr-item img {
  width: 130px;
  height: 130px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  margin-bottom: 8px;
}
.qr-item p { font-size: 0.82rem; color: var(--text-light); }

/* ---- 分享按钮 ---- */
.share-section { text-align: center; padding: 40px 0; }
.share-section h4 { font-size: 1rem; color: var(--text-light); margin-bottom: 16px; }
.share-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
  color: #fff;
}
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; color: #fff; }
.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #000; }
.share-bilibili { background: #00A1D6; }

/* ---- 页脚 ---- */
.footer {
  background: var(--gradient-dark);
  color: rgba(255,255,255,0.8);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand .logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-brand .logo-wrap img { height: 38px; filter: brightness(0) invert(1); opacity: 0.9; }
.footer-brand .brand-name {
  font-size: 1.3rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-brand p { font-size: 0.88rem; line-height: 1.8; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-link {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.8);
  transition: var(--transition);
}
.social-link:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.65);
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--secondary); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.6); }
.footer-bottom a:hover { color: var(--secondary); }

/* ---- 统计数字 ---- */
.stats-section {
  background: var(--gradient-dark);
  padding: 50px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}
.stat-item .num {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-item .label { font-size: 0.88rem; color: rgba(255,255,255,0.7); margin-top: 4px; }

/* ---- 图片画廊 ---- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.gallery-item {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3/4;
  position: relative;
  cursor: pointer;
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.gallery-item:hover img { transform: scale(1.05); }
.gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 50%);
  opacity: 0;
  transition: var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 16px;
}
.gallery-item:hover .gallery-overlay { opacity: 1; }
.gallery-overlay span { color: #fff; font-size: 0.9rem; font-weight: 600; }

/* ---- 内页横幅 ---- */
.page-banner {
  background: var(--gradient-dark);
  padding: 60px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../images/hero-banner.jpg') center/cover;
  opacity: 0.15;
}
.page-banner-content { position: relative; z-index: 1; }
.page-banner h1 { font-size: 2.2rem; font-weight: 800; color: #fff; margin-bottom: 10px; }
.page-banner p { color: rgba(255,255,255,0.75); font-size: 1rem; }

/* ---- 加入社区 ---- */
.join-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-item { text-align: center; }
.step-num {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
}
.step-item h4 { font-size: 0.95rem; font-weight: 700; color: var(--dark); margin-bottom: 6px; }
.step-item p { font-size: 0.85rem; color: var(--text-light); }

/* ---- AI功能 ---- */
.ai-card {
  background: linear-gradient(135deg, var(--dark), var(--dark3));
  border-radius: var(--radius);
  padding: 28px;
  color: #fff;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}
.ai-card::before {
  content: '';
  position: absolute;
  top: -30px;
  right: -30px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: rgba(232,51,109,0.15);
}
.ai-card:hover { transform: translateY(-4px); }
.ai-card .icon { font-size: 2rem; margin-bottom: 14px; }
.ai-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.ai-card p { font-size: 0.85rem; color: rgba(255,255,255,0.7); line-height: 1.7; }

/* ---- 弹幕效果 ---- */
.danmaku-container {
  background: var(--dark);
  border-radius: var(--radius);
  padding: 20px;
  overflow: hidden;
  position: relative;
  height: 80px;
  margin-bottom: 20px;
}
.danmaku-track {
  position: absolute;
  white-space: nowrap;
  animation: danmaku 12s linear infinite;
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
}
.danmaku-track:nth-child(2) { top: 30px; animation-delay: -4s; animation-duration: 15s; }
.danmaku-track:nth-child(3) { top: 55px; animation-delay: -8s; animation-duration: 10s; }
@keyframes danmaku {
  from { transform: translateX(100vw); }
  to { transform: translateX(-100%); }
}

/* ---- 直播卡片 ---- */
.live-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: #ff4444;
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}
.live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #fff;
  animation: pulse 1.2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ---- 加载动画 ---- */
.loading-skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---- 悬浮按钮 ---- */
.float-btns {
  position: fixed;
  right: 20px;
  bottom: 80px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 999;
}
.float-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 4px 15px rgba(232,51,109,0.35);
  transition: var(--transition);
  cursor: pointer;
}
.float-btn:hover { transform: scale(1.1); }
.back-top {
  background: rgba(26,26,46,0.85);
  backdrop-filter: blur(10px);
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}
.back-top.visible { opacity: 1; pointer-events: all; }

/* ---- 通知提示 ---- */
.toast {
  position: fixed;
  top: 80px;
  right: 20px;
  background: var(--dark);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  z-index: 9999;
  transform: translateX(120%);
  transition: transform 0.3s ease;
}
.toast.show { transform: translateX(0); }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .join-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  html { font-size: 15px; }
  .nav-menu { display: none; position: absolute; top: 70px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 16px; box-shadow: 0 8px 20px rgba(0,0,0,0.1); gap: 4px; }
  .nav-menu.open { display: flex; }
  .nav-toggle { display: flex; }
  .hero h1 { font-size: 2rem; }
  .hero-stats { gap: 20px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .section-header h2 { font-size: 1.6rem; }
  .join-steps { grid-template-columns: repeat(2, 1fr); }
  .qr-codes { flex-direction: column; align-items: center; }
}
@media (max-width: 480px) {
  .container { padding: 0 14px; }
  .hero h1 { font-size: 1.6rem; }
  .hero-stats { flex-direction: column; gap: 12px; }
  .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .join-steps { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ---- 懒加载图片 ---- */
img[data-src] { opacity: 0; transition: opacity 0.4s ease; }
img.loaded { opacity: 1; }

/* ---- 内页文章 ---- */
.article-content { max-width: 860px; margin: 0 auto; }
.article-content h2 { font-size: 1.4rem; font-weight: 700; color: var(--dark); margin: 30px 0 14px; }
.article-content h3 { font-size: 1.15rem; font-weight: 600; color: var(--dark); margin: 24px 0 10px; }
.article-content p { font-size: 0.95rem; color: var(--text); line-height: 1.9; margin-bottom: 16px; }
.article-content ul { padding-left: 20px; margin-bottom: 16px; }
.article-content ul li { font-size: 0.95rem; color: var(--text); line-height: 1.8; margin-bottom: 6px; list-style: disc; }

/* ---- 标签云 ---- */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  padding: 5px 14px;
  background: rgba(232,51,109,0.08);
  color: var(--primary);
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px solid rgba(232,51,109,0.2);
  transition: var(--transition);
}
.tag:hover { background: var(--primary); color: #fff; }

/* ---- 视频分类横幅 ---- */
.cat-banner {
  border-radius: var(--radius);
  padding: 24px;
  background: var(--gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
}
.cat-banner h2 { font-size: 1.4rem; font-weight: 800; }
.cat-banner p { font-size: 0.88rem; opacity: 0.85; margin-top: 4px; }

/* ---- 侧边栏 ---- */
.sidebar { display: flex; flex-direction: column; gap: 24px; }
.sidebar-widget {
  background: var(--bg2);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.sidebar-widget h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--primary);
  display: inline-block;
}
.hot-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
}
.hot-list li:last-child { border-bottom: none; }
.hot-rank {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}
.hot-rank.top1 { background: #E8336D; color: #fff; }
.hot-rank.top2 { background: #F5A623; color: #fff; }
.hot-rank.top3 { background: #9B59B6; color: #fff; }