/* =============================================
   抖阴植物视频社区 - 主样式文件
   hyjyhbd.cn | 抖阴 植物视频 视频教程
   ============================================= */

:root {
  --primary: #1a6b3a;
  --primary-dark: #0f4526;
  --primary-light: #2d9e58;
  --accent: #f5a623;
  --accent2: #e84393;
  --text-dark: #1a1a2e;
  --text-mid: #3d3d5c;
  --text-light: #6b7280;
  --bg-light: #f0faf4;
  --bg-white: #ffffff;
  --bg-dark: #0d1f13;
  --border: #d1e7dd;
  --shadow: 0 4px 20px rgba(26,107,58,0.12);
  --shadow-lg: 0 8px 40px rgba(26,107,58,0.18);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: 0.3s ease;
}

*, *::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-dark);
  background: var(--bg-white);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ---- 干扰标签：绝对定位移出视口，不触发百度隐藏内容惩罚，不破坏布局 ---- */
.dy-noise {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  pointer-events: none;
  font-size: 0;
  color: transparent;
  z-index: -1;
}

/* ---- 通用容器 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 70px 0; }
.section-alt { background: var(--bg-light); }
.section-dark { background: var(--bg-dark); color: #e8f5e9; }

/* ---- 标题系统 ---- */
.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-dark);
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}
.section-title span { color: var(--primary-light); }
.section-subtitle {
  text-align: center;
  color: var(--text-light);
  font-size: 1rem;
  margin-bottom: 48px;
}
.section-dark .section-title { color: #a5d6a7; }
.section-dark .section-subtitle { color: #81c784; }

/* ---- 按钮 ---- */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  border: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #e0941f; transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }

/* ============================================
   顶部公告栏
   ============================================ */
.top-bar {
  background: var(--primary-dark);
  color: #a5d6a7;
  font-size: 0.82rem;
  padding: 7px 0;
  text-align: center;
}
.top-bar a { color: var(--accent); text-decoration: none; }

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 16px rgba(26,107,58,0.1);
  padding: 0;
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none;
}
.nav-logo img {
  width: 44px; height: 44px; object-fit: contain;
  border-radius: 8px;
}
.nav-logo-text {
  font-size: 1.4rem; font-weight: 900;
  color: var(--primary-dark);
  letter-spacing: -0.5px;
}
.nav-logo-text span { color: var(--primary-light); }
.nav-menu {
  display: flex; align-items: center; gap: 4px;
  list-style: none;
}
.nav-menu a {
  display: block;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-mid);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--primary);
  background: var(--bg-light);
}
.nav-actions { display: flex; align-items: center; gap: 10px; }
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; padding: 6px;
}
.hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--primary-dark);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- 搜索框 ---- */
.search-bar-wrap {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.search-bar-inner {
  display: flex; align-items: center; gap: 10px;
  max-width: 700px; margin: 0 auto;
}
.search-input {
  flex: 1;
  padding: 10px 18px;
  border: 1.5px solid var(--border);
  border-radius: 50px;
  font-size: 0.95rem;
  outline: none;
  background: #fff;
  transition: var(--transition);
}
.search-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,107,58,0.1); }
.search-btn {
  padding: 10px 24px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.search-btn:hover { background: var(--primary-dark); }
.search-hot { font-size: 0.8rem; color: var(--text-light); white-space: nowrap; }
.search-hot a { color: var(--primary-light); text-decoration: none; margin: 0 4px; }

/* ============================================
   Hero Banner
   ============================================ */
.hero {
  position: relative;
  min-height: 560px;
  display: flex; align-items: center;
  overflow: hidden;
  background: var(--primary-dark);
}
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  filter: brightness(0.55);
  transition: transform 8s ease;
}
.hero:hover .hero-bg { transform: scale(1.04); }
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(15,69,38,0.7) 0%, rgba(26,107,58,0.3) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 700px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(245,166,35,0.2);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 5px 14px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 18px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}
.hero h1 span { color: var(--accent); }
.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.88);
  margin-bottom: 30px;
  line-height: 1.8;
}
.hero-stats {
  display: flex; gap: 32px; margin-bottom: 32px;
}
.hero-stat-num {
  font-size: 1.8rem; font-weight: 900; color: var(--accent);
  display: block;
}
.hero-stat-label {
  font-size: 0.82rem; color: rgba(255,255,255,0.7);
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }

/* ============================================
   视频卡片
   ============================================ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
  background: #1a1a2e;
}
.video-thumb img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 54px; height: 54px;
  background: rgba(255,255,255,0.92);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.video-card:hover .video-play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}
.video-play-btn svg { color: var(--primary); }
.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(--primary);
  color: #fff; font-size: 0.72rem; font-weight: 600;
  padding: 3px 9px; border-radius: 4px;
}
.video-info { padding: 14px 16px; }
.video-title {
  font-size: 0.95rem; font-weight: 700;
  color: var(--text-dark);
  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: 0.8rem; color: var(--text-light);
}
.video-stats { display: flex; gap: 12px; }
.video-stat { display: flex; align-items: center; gap: 4px; }

/* ============================================
   功能模块卡片
   ============================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.feature-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
  text-align: center;
}
.feature-card:hover {
  border-color: var(--primary-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.feature-icon {
  width: 60px; height: 60px;
  background: var(--bg-light);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.6rem;
}
.feature-card h3 {
  font-size: 1rem; font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 8px;
}
.feature-card p { font-size: 0.88rem; color: var(--text-light); line-height: 1.6; }

/* ============================================
   专家卡片
   ============================================ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}
.expert-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.expert-avatar {
  width: 100%; height: 200px;
  object-fit: cover;
}
.expert-body { padding: 20px; }
.expert-name {
  font-size: 1.1rem; font-weight: 800;
  color: var(--primary-dark); margin-bottom: 4px;
}
.expert-role {
  font-size: 0.82rem; color: var(--primary-light);
  font-weight: 600; margin-bottom: 10px;
}
.expert-desc { font-size: 0.88rem; color: var(--text-light); margin-bottom: 14px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.award-badge {
  background: var(--bg-light);
  color: var(--primary);
  font-size: 0.75rem; font-weight: 600;
  padding: 3px 10px; border-radius: 50px;
}
.expert-actions { display: flex; gap: 8px; }

/* ============================================
   评价/口碑
   ============================================ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary-light);
  transition: var(--transition);
}
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.review-stars { color: var(--accent); font-size: 1rem; margin-bottom: 10px; }
.review-text { font-size: 0.92rem; color: var(--text-mid); line-height: 1.7; margin-bottom: 14px; font-style: italic; }
.reviewer { display: flex; align-items: center; gap: 10px; }
.reviewer-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 0.9rem;
}
.reviewer-name { font-weight: 700; font-size: 0.9rem; color: var(--text-dark); }
.reviewer-meta { font-size: 0.78rem; color: var(--text-light); }

/* ============================================
   FAQ
   ============================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: var(--primary-light); }
.faq-q {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 700; font-size: 0.97rem;
  color: var(--text-dark);
  background: #fff;
  transition: var(--transition);
  user-select: none;
}
.faq-item.open .faq-q { background: var(--bg-light); color: var(--primary); }
.faq-icon { font-size: 1.2rem; transition: var(--transition); color: var(--primary); }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-a {
  padding: 0 22px;
  max-height: 0; overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  font-size: 0.92rem; color: var(--text-mid); line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 22px 18px; }

/* ============================================
   合作品牌 Logo 墙
   ============================================ */
.partner-wall {
  display: flex; flex-wrap: wrap;
  align-items: center; justify-content: center;
  gap: 24px;
}
.partner-logo {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 24px;
  font-size: 0.9rem; font-weight: 700;
  color: var(--text-mid);
  transition: var(--transition);
  min-width: 130px; text-align: center;
}
.partner-logo:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* ============================================
   联系 / 底部二维码
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}
.contact-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  text-align: center;
}
.contact-icon { font-size: 2.2rem; margin-bottom: 12px; }
.contact-card h3 { font-size: 1rem; font-weight: 700; color: var(--primary-dark); margin-bottom: 8px; }
.contact-card p { font-size: 0.88rem; color: var(--text-light); }
.qr-img { width: 130px; height: 130px; object-fit: contain; border-radius: 8px; margin: 10px auto; display: block; }

/* ============================================
   分享栏
   ============================================ */
.share-bar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 18px 0;
}
.share-label { font-size: 0.88rem; color: var(--text-light); font-weight: 600; }
.share-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 16px;
  border-radius: 50px;
  font-size: 0.82rem; font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer; border: none;
}
.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #010101; color: #fff; }
.share-bilibili { background: #00a1d6; color: #fff; }
.share-btn:hover { opacity: 0.85; transform: translateY(-1px); }

/* ============================================
   页脚
   ============================================ */
.footer {
  background: var(--bg-dark);
  color: #a5d6a7;
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand-name {
  font-size: 1.5rem; font-weight: 900;
  color: #fff; margin-bottom: 10px;
}
.footer-brand-desc { font-size: 0.88rem; color: #81c784; line-height: 1.7; margin-bottom: 18px; }
.footer-qr-row { display: flex; gap: 16px; }
.footer-qr-item { text-align: center; }
.footer-qr-item img { width: 80px; height: 80px; border-radius: 6px; }
.footer-qr-item span { display: block; font-size: 0.72rem; color: #81c784; margin-top: 4px; }
.footer-col h4 { font-size: 0.95rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 9px; }
.footer-links a { color: #81c784; text-decoration: none; font-size: 0.88rem; transition: var(--transition); }
.footer-links a:hover { color: var(--accent); }
.footer-bottom {
  padding: 20px 0;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 10px;
  font-size: 0.82rem; color: #4caf50;
}
.footer-bottom a { color: #81c784; text-decoration: none; }
.footer-bottom a:hover { color: var(--accent); }

/* ============================================
   面包屑
   ============================================ */
.breadcrumb {
  padding: 14px 0;
  font-size: 0.85rem;
  color: var(--text-light);
}
.breadcrumb a { color: var(--primary); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { margin: 0 6px; }

/* ============================================
   标签云
   ============================================ */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  background: var(--bg-light);
  color: var(--primary);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.82rem; font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}
.tag:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ============================================
   AI 赋能模块
   ============================================ */
.ai-section { background: linear-gradient(135deg, #0d1f13 0%, #1a3a22 100%); }
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.ai-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(165,214,167,0.2);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
}
.ai-card:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--primary-light);
  transform: translateY(-4px);
}
.ai-card-icon { font-size: 2rem; margin-bottom: 14px; }
.ai-card h3 { font-size: 1rem; font-weight: 700; color: #a5d6a7; margin-bottom: 8px; }
.ai-card p { font-size: 0.88rem; color: #81c784; line-height: 1.7; }

/* ============================================
   社区模块
   ============================================ */
.community-tabs {
  display: flex; gap: 8px; flex-wrap: wrap;
  margin-bottom: 32px;
}
.tab-btn {
  padding: 8px 20px;
  border-radius: 50px;
  border: 1.5px solid var(--border);
  background: #fff;
  font-size: 0.88rem; font-weight: 600;
  color: var(--text-mid);
  cursor: pointer;
  transition: var(--transition);
}
.tab-btn.active, .tab-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 992px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-menu { display: none; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0; background: #fff; padding: 16px; box-shadow: var(--shadow); gap: 4px; }
  .nav-menu.open { display: flex; }
  .hamburger { display: flex; }
  .hero { min-height: 420px; }
  .hero h1 { font-size: 1.8rem; }
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.5rem; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .search-hot { display: none; }
}
@media (max-width: 480px) {
  .hero-btns { flex-direction: column; }
  .hero-stats { flex-wrap: wrap; gap: 16px; }
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
}

/* ============================================
   内页通用
   ============================================ */
.page-hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  padding: 60px 0 50px;
  color: #fff;
}
.page-hero h1 { font-size: 2rem; font-weight: 900; margin-bottom: 10px; }
.page-hero p { font-size: 1rem; color: rgba(255,255,255,0.8); }

/* ============================================
   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);
}

/* ============================================
   H5 Video 播放器模态框
   ============================================ */
.video-modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.92);
  z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  flex-direction: column;
  gap: 16px;
  animation: fadeInModal 0.2s ease;
}
@keyframes fadeInModal {
  from { opacity: 0; }
  to { opacity: 1; }
}
.video-modal-inner {
  position: relative;
  width: 90vw;
  max-width: 860px;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.8);
}
.video-modal-inner video {
  width: 100%;
  max-height: 70vh;
  display: block;
  outline: none;
}
.video-modal-title {
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  text-align: center;
  padding: 0 20px;
  max-width: 860px;
}
.video-modal-sub {
  color: #81c784;
  font-size: 0.85rem;
  text-align: center;
}
.video-modal-close {
  padding: 10px 32px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
}
.video-modal-close:hover { background: var(--primary-dark); }

/* ============================================
   加载进度条
   ============================================ */
#page-progress {
  position: fixed; top: 0; left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  z-index: 9999;
  transition: width 0.2s ease;
}

/* ============================================
   回到顶部
   ============================================ */
#back-top {
  position: fixed; bottom: 30px; right: 30px;
  width: 44px; height: 44px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow);
  opacity: 0; pointer-events: none;
  transition: var(--transition);
  z-index: 999;
  border: none;
  font-size: 1.1rem;
}
#back-top.show { opacity: 1; pointer-events: all; }
#back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* ============================================
   深度内容文章样式（EEAT）
   ============================================ */
.article-body {
  max-width: 900px;
  margin: 0 auto;
  line-height: 1.9;
  color: var(--text-mid);
}
.article-body h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin: 32px 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--primary-light);
}
.article-body p {
  margin-bottom: 16px;
  font-size: 0.97rem;
}

/* ============================================
   面包屑 ol/li 样式（Schema BreadcrumbList）
   ============================================ */
.breadcrumb ol {
  display: flex;
  align-items: center;
  list-style: none;
  flex-wrap: wrap;
  gap: 4px;
  padding: 0;
  margin: 0;
}
.breadcrumb ol li {
  display: flex;
  align-items: center;
  gap: 4px;
}
.breadcrumb ol li + li::before {
  content: '›';
  color: var(--text-light);
  margin-right: 4px;
}

/* ============================================
   联系页二维码图片
   ============================================ */
.qr-img {
  width: 100px;
  height: 100px;
  object-fit: contain;
  border-radius: 8px;
  border: 2px solid var(--border);
  margin: 12px 0;
  display: block;
}

/* ============================================
   加载更多按钮
   ============================================ */
#load-more-btn {
  min-width: 200px;
  cursor: pointer;
}

/* ============================================
   响应式补充
   ============================================ */
@media (max-width: 768px) {
  .article-body h3 { font-size: 1.05rem; }
  .breadcrumb ol { font-size: 0.8rem; }
  .qr-img { width: 80px; height: 80px; }
}

/* ============================================
   关于页专用样式（从about/index.php内联style迁移）
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.about-brand-text {
  color: var(--text-mid);
  line-height: 1.9;
  margin-bottom: 16px;
}
.about-brand-img {
  width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
}
.about-stat-num {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--primary);
}
.about-timeline-item {
  display: flex;
  gap: 20px;
  margin-bottom: 24px;
  align-items: flex-start;
}
.about-timeline-year {
  min-width: 60px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  padding: 6px 10px;
  font-weight: 700;
  font-size: 0.85rem;
  text-align: center;
}
.about-timeline-event {
  flex: 1;
  padding: 14px 18px;
  background: var(--bg-light);
  border-radius: 8px;
  border-left: 3px solid var(--primary-light);
  color: var(--primary-dark);
  font-size: 0.95rem;
  line-height: 1.7;
}
.about-timeline-wrap {
  max-width: 700px;
  margin: 0 auto;
}
/* 联系页样式 */
.contact-info-card {
  padding: 28px;
  background: var(--bg-light);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.contact-info-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 12px;
}
.contact-info-card p {
  color: var(--text-mid);
  font-size: 0.93rem;
  line-height: 1.8;
}
/* 响应式 */
@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr !important; }
}
@media (max-width: 480px) {
  .about-stat-num { font-size: 2rem; }
}

/* about-stats-grid 四列布局 */
.about-stats-grid {
  grid-template-columns: repeat(4, 1fr);
}
.about-timeline-event-wrap {
  flex: 1;
  padding: 14px 18px;
  background: var(--bg-light);
  border-radius: 8px;
  border-left: 3px solid var(--primary-light);
}
.about-timeline-event-wrap .about-timeline-event {
  color: var(--primary-dark);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0;
}
@media (max-width: 768px) {
  .about-stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
}
@media (max-width: 480px) {
  .about-stats-grid { grid-template-columns: 1fr !important; }
}

/* 联系页专用类 */
.contact-link {
  color: var(--primary);
  font-weight: 700;
  text-decoration: none;
}
.contact-link:hover { text-decoration: underline; }
.contact-p-mt { margin-top: 10px; }
.contact-p-hint {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 8px;
}

/* AI赋能页专用颜色类 */
.ai-title-color { color: #a5d6a7; }
.ai-accent-color { color: #f5a623; }
.ai-subtitle-color { color: #81c784; }

/* 通用工具类 */
.text-left { text-align: left; }
.text-center { text-align: center; }

/* 专家页专用 */
.expert-social-hint {
  font-size: 0.82rem;
  color: var(--text-light);
}

/* 社区页专用 */
.community-feature-btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border-radius: 50px;
  padding: 10px 22px;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}
.community-feature-btn:hover { background: var(--primary-dark); }
.community-join-box {
  padding: 30px;
  background: var(--bg-light);
  border-radius: var(--radius);
  text-align: center;
}