/* ========================================
   51 - 主样式文件
   品牌色：深红 #C0392B | 暗黑 #0D0D0D | 深灰 #1A1A2E
   辅助色：金黄 #F39C12 | 青蓝 #16A085
   ======================================== */

/* ---- 基础重置 ---- */
*, *::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', 'Hiragino Sans GB', sans-serif;
  background: #0D0D0D;
  color: #E8E8E8;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: #E74C3C; text-decoration: none; transition: color .25s; }
a:hover { color: #FF6B6B; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ---- 容器 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 70px 0; }
.section-alt { background: #111122; }

/* ---- 标题系统 ---- */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: #FFFFFF;
  text-align: center;
  margin-bottom: 12px;
  position: relative;
}
.section-title span { color: #E74C3C; }
.section-subtitle {
  text-align: center;
  color: #999;
  font-size: .95rem;
  margin-bottom: 48px;
}
.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, #E74C3C, #F39C12);
  margin: 12px auto 0;
  border-radius: 2px;
}

/* ---- 顶部公告栏 ---- */
.top-bar {
  background: linear-gradient(90deg, #C0392B, #922B21);
  color: #fff;
  font-size: .82rem;
  padding: 6px 0;
  text-align: center;
  letter-spacing: .5px;
}
.top-bar a { color: #FFD700; }

/* ---- 头部导航 ---- */
.site-header {
  background: rgba(13,13,13,.97);
  border-bottom: 1px solid #2a2a3e;
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
}
.logo-wrap { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-wrap img { height: 42px; width: auto; }
.logo-text { font-size: 1.4rem; font-weight: 800; color: #fff; letter-spacing: 1px; }
.logo-text span { color: #E74C3C; }

/* 主导航 */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  color: #CCC;
  font-size: .9rem;
  padding: 6px 14px;
  border-radius: 4px;
  transition: all .2s;
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: #fff;
  background: rgba(231,76,60,.15);
}
.main-nav a.active { color: #E74C3C; }

/* 汉堡菜单 */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 5px; }
.hamburger span { display: block; width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: all .3s; }

/* ---- 搜索栏 ---- */
.search-bar-wrap {
  background: #111122;
  border-bottom: 1px solid #1e1e35;
  padding: 10px 0;
}
.search-form {
  display: flex;
  max-width: 680px;
  margin: 0 auto;
  background: #1A1A2E;
  border: 1px solid #2a2a4a;
  border-radius: 30px;
  overflow: hidden;
  transition: border-color .2s;
}
.search-form:focus-within { border-color: #E74C3C; }
.search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: #eee;
  font-size: .9rem;
  padding: 10px 20px;
}
.search-input::placeholder { color: #666; }
.search-btn {
  background: linear-gradient(135deg, #E74C3C, #C0392B);
  border: none;
  color: #fff;
  padding: 10px 22px;
  cursor: pointer;
  font-size: .9rem;
  transition: opacity .2s;
}
.search-btn:hover { opacity: .85; }

/* ---- 面包屑 ---- */
.breadcrumb {
  padding: 12px 0;
  font-size: .82rem;
  color: #888;
}
.breadcrumb a { color: #888; }
.breadcrumb a:hover { color: #E74C3C; }
.breadcrumb span { margin: 0 6px; }

/* ---- Hero Banner ---- */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #0a0a1a;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero-banner.jpg');
  background-size: cover;
  background-position: center;
  opacity: .45;
  filter: blur(1px);
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,13,13,.85) 40%, rgba(192,57,43,.2));
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
}
.hero-badge {
  display: inline-block;
  background: rgba(231,76,60,.2);
  border: 1px solid rgba(231,76,60,.5);
  color: #E74C3C;
  font-size: .78rem;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 18px;
  letter-spacing: 1px;
}
.hero h1 {
  font-size: 2.8rem;
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 18px;
  text-shadow: 0 2px 20px rgba(0,0,0,.5);
}
.hero h1 em { color: #E74C3C; font-style: normal; }
.hero p {
  font-size: 1.05rem;
  color: #CCC;
  margin-bottom: 30px;
  max-width: 520px;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  background: linear-gradient(135deg, #E74C3C, #C0392B);
  color: #fff;
  padding: 13px 32px;
  border-radius: 6px;
  font-size: .95rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform .2s, box-shadow .2s;
  display: inline-block;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(231,76,60,.4); color: #fff; }
.btn-outline {
  background: transparent;
  color: #fff;
  padding: 12px 30px;
  border-radius: 6px;
  font-size: .95rem;
  border: 1px solid rgba(255,255,255,.4);
  cursor: pointer;
  transition: all .2s;
  display: inline-block;
}
.btn-outline:hover { border-color: #E74C3C; color: #E74C3C; background: rgba(231,76,60,.08); }

/* 滚动数字统计 */
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-num { font-size: 1.8rem; font-weight: 800; color: #E74C3C; }
.stat-label { font-size: .78rem; color: #888; margin-top: 2px; }

/* ---- 动漫视频卡片 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.video-card {
  background: #111122;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid #1e1e35;
  transition: transform .25s, box-shadow .25s;
  cursor: pointer;
}
.video-card:hover { transform: translateY(-5px); box-shadow: 0 12px 35px rgba(0,0,0,.5); }
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #0a0a1a;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,.4);
  opacity: 0;
  transition: opacity .25s;
}
.video-card:hover .play-btn { opacity: 1; }
.play-icon {
  width: 54px;
  height: 54px;
  background: rgba(231,76,60,.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(.85);
  transition: transform .2s;
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  border-left: 20px solid #fff;
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  margin-left: 4px;
}
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: #E74C3C;
  color: #fff;
  font-size: .72rem;
  padding: 2px 8px;
  border-radius: 3px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,.75);
  color: #fff;
  font-size: .72rem;
  padding: 2px 7px;
  border-radius: 3px;
}
.video-info { padding: 14px; }
.video-title {
  font-size: .92rem;
  font-weight: 600;
  color: #EEE;
  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;
  gap: 14px;
  font-size: .78rem;
  color: #888;
}
.video-meta span { display: flex; align-items: center; gap: 4px; }

/* ---- 分类标签栏 ---- */
.tag-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.tag-btn {
  background: #1A1A2E;
  border: 1px solid #2a2a4a;
  color: #AAA;
  padding: 6px 18px;
  border-radius: 20px;
  font-size: .85rem;
  cursor: pointer;
  transition: all .2s;
}
.tag-btn:hover, .tag-btn.active {
  background: #E74C3C;
  border-color: #E74C3C;
  color: #fff;
}

/* ---- 专家卡片 ---- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.expert-card {
  background: #111122;
  border: 1px solid #1e1e35;
  border-radius: 12px;
  padding: 28px 20px;
  text-align: center;
  transition: transform .25s, border-color .25s;
}
.expert-card:hover { transform: translateY(-4px); border-color: #E74C3C; }
.expert-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 14px;
  border: 3px solid #E74C3C;
}
.expert-name { font-size: 1.05rem; font-weight: 700; color: #fff; margin-bottom: 4px; }
.expert-title { font-size: .8rem; color: #E74C3C; margin-bottom: 10px; }
.expert-desc { font-size: .82rem; color: #999; line-height: 1.6; margin-bottom: 14px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 16px; }
.award-tag {
  background: rgba(243,156,18,.15);
  border: 1px solid rgba(243,156,18,.3);
  color: #F39C12;
  font-size: .72rem;
  padding: 2px 8px;
  border-radius: 3px;
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  padding: 6px 14px;
  font-size: .78rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all .2s;
}
.btn-sm-primary { background: #E74C3C; color: #fff; border: none; }
.btn-sm-primary:hover { background: #C0392B; }
.btn-sm-outline { background: transparent; color: #AAA; border: 1px solid #444; }
.btn-sm-outline:hover { border-color: #E74C3C; color: #E74C3C; }

/* ---- AI赋能模块 ---- */
.ai-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.ai-card {
  background: linear-gradient(135deg, #111122, #1A1A2E);
  border: 1px solid #2a2a4a;
  border-radius: 12px;
  padding: 30px 24px;
  position: relative;
  overflow: hidden;
  transition: border-color .25s, transform .25s;
}
.ai-card:hover { border-color: #E74C3C; transform: translateY(-3px); }
.ai-card::before {
  content: '';
  position: absolute;
  top: -30px;
  right: -30px;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(231,76,60,.15), transparent);
  border-radius: 50%;
}
.ai-icon {
  width: 52px;
  height: 52px;
  background: rgba(231,76,60,.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 16px;
}
.ai-card h3 { font-size: 1.05rem; color: #fff; margin-bottom: 10px; }
.ai-card p { font-size: .85rem; color: #999; line-height: 1.7; }

/* ---- 社区功能 ---- */
.community-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.community-card {
  background: #111122;
  border: 1px solid #1e1e35;
  border-radius: 10px;
  padding: 24px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  transition: border-color .2s;
}
.community-card:hover { border-color: #16A085; }
.comm-icon {
  width: 48px;
  height: 48px;
  background: rgba(22,160,133,.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}
.comm-content h4 { color: #fff; font-size: .95rem; margin-bottom: 6px; }
.comm-content p { color: #888; font-size: .82rem; line-height: 1.6; }

/* ---- 合作品牌Logo墙 ---- */
.partner-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: #111122;
  border: 1px solid #1e1e35;
  border-radius: 8px;
  padding: 16px 28px;
  color: #888;
  font-size: .9rem;
  font-weight: 600;
  transition: all .2s;
  min-width: 120px;
  text-align: center;
}
.partner-item:hover { border-color: #E74C3C; color: #E74C3C; }

/* ---- 用户评论 ---- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: #111122;
  border: 1px solid #1e1e35;
  border-radius: 10px;
  padding: 22px;
  transition: border-color .2s;
}
.review-card:hover { border-color: #F39C12; }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #E74C3C, #C0392B);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}
.reviewer-info { flex: 1; }
.reviewer-name { color: #fff; font-size: .9rem; font-weight: 600; }
.reviewer-tag { color: #888; font-size: .75rem; }
.review-stars { color: #F39C12; font-size: .9rem; margin-bottom: 10px; }
.review-text { color: #AAA; font-size: .85rem; line-height: 1.7; }
.review-date { color: #666; font-size: .75rem; margin-top: 10px; }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: #111122;
  border: 1px solid #1e1e35;
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  padding: 18px 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  color: #EEE;
  font-size: .95rem;
  font-weight: 600;
  transition: color .2s;
}
.faq-question:hover { color: #E74C3C; }
.faq-question .faq-icon {
  color: #E74C3C;
  font-size: 1.2rem;
  transition: transform .3s;
  flex-shrink: 0;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
}
.faq-answer-inner {
  padding: 0 22px 18px;
  color: #999;
  font-size: .88rem;
  line-height: 1.8;
  border-top: 1px solid #1e1e35;
  padding-top: 14px;
}
.faq-item.open .faq-answer { max-height: 300px; }

/* ---- 联系我们 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info h3 { color: #fff; font-size: 1.2rem; margin-bottom: 20px; }
.contact-item {
  display: flex;
  gap: 14px;
  margin-bottom: 18px;
  align-items: flex-start;
}
.contact-icon {
  width: 40px;
  height: 40px;
  background: rgba(231,76,60,.15);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-detail { color: #AAA; font-size: .88rem; line-height: 1.6; }
.contact-detail strong { color: #EEE; display: block; margin-bottom: 2px; }
.qr-row { display: flex; gap: 24px; flex-wrap: wrap; }
.qr-item { text-align: center; }
.qr-item img { width: 120px; height: 120px; border-radius: 8px; margin-bottom: 8px; }
.qr-item p { color: #888; font-size: .78rem; }

/* ---- 社交分享 ---- */
.share-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 20px;
}
.share-btn {
  padding: 9px 20px;
  border-radius: 6px;
  font-size: .85rem;
  cursor: pointer;
  border: none;
  transition: opacity .2s;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 6px;
}
.share-btn:hover { opacity: .85; }
.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #000; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; }

/* ---- How-To 加入指南 ---- */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.howto-step {
  background: #111122;
  border: 1px solid #1e1e35;
  border-radius: 10px;
  padding: 24px 20px;
  position: relative;
  text-align: center;
  counter-increment: step;
}
.howto-step::before {
  content: counter(step);
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 28px;
  background: #E74C3C;
  color: #fff;
  border-radius: 50%;
  font-size: .85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 28px;
}
.howto-step h4 { color: #fff; font-size: .95rem; margin-bottom: 8px; margin-top: 6px; }
.howto-step p { color: #888; font-size: .82rem; line-height: 1.6; }

/* ---- 底部 ---- */
.site-footer {
  background: #080810;
  border-top: 1px solid #1e1e35;
  padding: 50px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo-wrap { margin-bottom: 16px; }
.footer-brand p { color: #777; font-size: .85rem; line-height: 1.8; }
.footer-col h4 { color: #EEE; font-size: .95rem; margin-bottom: 16px; font-weight: 600; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { color: #777; font-size: .85rem; transition: color .2s; }
.footer-col ul li a:hover { color: #E74C3C; }
.footer-bottom {
  border-top: 1px solid #1e1e35;
  padding: 18px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.footer-bottom p { color: #666; font-size: .8rem; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: #666; font-size: .8rem; }
.footer-links a:hover { color: #E74C3C; }
.update-time { color: #555; font-size: .78rem; }

/* ---- 弹幕效果 ---- */
.danmaku-wrap {
  position: relative;
  overflow: hidden;
  height: 40px;
  background: rgba(0,0,0,.3);
  border-radius: 6px;
  margin-top: 16px;
}
.danmaku-inner {
  display: flex;
  gap: 40px;
  white-space: nowrap;
  animation: danmaku 20s linear infinite;
  padding: 10px 0;
}
.danmaku-item { color: #CCC; font-size: .82rem; }
.danmaku-item span { color: #E74C3C; margin-right: 6px; }
@keyframes danmaku { from { transform: translateX(100%); } to { transform: translateX(-100%); } }

/* ---- 标签云 ---- */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-cloud a {
  background: #1A1A2E;
  border: 1px solid #2a2a4a;
  color: #AAA;
  font-size: .8rem;
  padding: 4px 12px;
  border-radius: 4px;
  transition: all .2s;
}
.tag-cloud a:hover { background: #E74C3C; border-color: #E74C3C; color: #fff; }

/* ---- 内页 Hero ---- */
.page-hero {
  background: linear-gradient(135deg, #0a0a1a, #1A1A2E);
  padding: 60px 0 40px;
  border-bottom: 1px solid #1e1e35;
}
.page-hero h1 { font-size: 2.2rem; color: #fff; margin-bottom: 10px; }
.page-hero p { color: #888; font-size: .95rem; }

/* ---- 分页 ---- */
.pagination {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 40px;
}
.page-btn {
  width: 36px;
  height: 36px;
  background: #111122;
  border: 1px solid #1e1e35;
  color: #AAA;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
  cursor: pointer;
  transition: all .2s;
}
.page-btn:hover, .page-btn.active { background: #E74C3C; border-color: #E74C3C; color: #fff; }

/* ---- 侧边栏 ---- */
.sidebar { position: sticky; top: 90px; }
.sidebar-widget {
  background: #111122;
  border: 1px solid #1e1e35;
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}
.sidebar-widget h3 { color: #fff; font-size: .95rem; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 1px solid #1e1e35; }
.sidebar-list li { padding: 8px 0; border-bottom: 1px solid #1a1a2e; }
.sidebar-list li:last-child { border-bottom: none; }
.sidebar-list a { color: #AAA; font-size: .85rem; display: flex; justify-content: space-between; }
.sidebar-list a:hover { color: #E74C3C; }
.sidebar-count { color: #666; font-size: .78rem; }

/* ---- 直播/在线标识 ---- */
.live-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(231,76,60,.15);
  border: 1px solid rgba(231,76,60,.4);
  color: #E74C3C;
  font-size: .75rem;
  padding: 3px 10px;
  border-radius: 20px;
}
.live-dot {
  width: 7px;
  height: 7px;
  background: #E74C3C;
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .3; } }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .hero h1 { font-size: 1.9rem; }
  .section { padding: 50px 0; }
  .section-title { font-size: 1.6rem; }
  .main-nav { display: none; position: fixed; top: 68px; left: 0; right: 0; background: #0D0D0D; flex-direction: column; padding: 20px; gap: 0; border-bottom: 1px solid #1e1e35; z-index: 999; }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; border-bottom: 1px solid #1e1e35; }
  .hamburger { display: flex; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .community-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .hero-stats { gap: 20px; }
  .expert-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.5rem; }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { text-align: center; }
  .video-grid { grid-template-columns: 1fr 1fr; }
}

/* ======================================
   新增补充样式 - 修复版
   ====================================== */

/* ---- 面包屑导航（可见HTML版） ---- */
.breadcrumb-nav {
  background: #111122;
  border-bottom: 1px solid #1e1e35;
  padding: 10px 0;
}
.breadcrumb-nav .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.breadcrumb-nav .breadcrumb li { display: flex; align-items: center; }
.breadcrumb-nav .breadcrumb a { color: #888; font-size: .82rem; }
.breadcrumb-nav .breadcrumb a:hover { color: #E74C3C; }
.breadcrumb-nav .breadcrumb span { color: #ccc; font-size: .82rem; }
.breadcrumb-nav .bc-sep { color: #555; font-size: .82rem; margin: 0 4px; }

/* ---- 时间线 ---- */
.timeline { max-width: 800px; margin: 0 auto; position: relative; }
.timeline::before {
  content: '';
  position: absolute;
  left: 80px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, #E74C3C, #9B59B6);
}
.timeline-item {
  display: flex;
  gap: 30px;
  margin-bottom: 30px;
  position: relative;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: 74px;
  top: 8px;
  width: 14px;
  height: 14px;
  background: #E74C3C;
  border-radius: 50%;
  border: 2px solid #0D0D0D;
  z-index: 1;
}
.timeline-year {
  min-width: 60px;
  color: #E74C3C;
  font-weight: 800;
  font-size: 1rem;
  padding-top: 4px;
  text-align: right;
}
.timeline-content {
  background: #111122;
  border: 1px solid #1e1e35;
  border-radius: 8px;
  padding: 16px 20px;
  flex: 1;
}
.timeline-content h4 { color: #fff; font-size: .95rem; margin-bottom: 8px; }
.timeline-content p { color: #888; font-size: .85rem; line-height: 1.7; }

/* ---- 信任徽章 ---- */
.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #111122;
  border: 1px solid #1e1e35;
  color: #AAA;
  font-size: .78rem;
  padding: 4px 10px;
  border-radius: 4px;
}

/* ---- 视觉隐藏（SEO可访问性） ---- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ---- 搜索栏 ---- */
.search-bar-wrap {
  background: #111122;
  border-bottom: 1px solid #1e1e35;
  padding: 10px 0;
}
.search-form { display: flex; gap: 8px; max-width: 600px; margin: 0 auto; }
.search-input {
  flex: 1;
  background: #1A1A2E;
  border: 1px solid #2a2a4a;
  border-radius: 6px;
  padding: 8px 16px;
  color: #EEE;
  font-size: .88rem;
  outline: none;
}
.search-input:focus { border-color: #E74C3C; }
.search-btn {
  background: #E74C3C;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 8px 20px;
  font-size: .88rem;
  cursor: pointer;
  transition: background .2s;
}
.search-btn:hover { background: #C0392B; }

/* ---- 分享按钮 ---- */
.share-section { background: #111122; border-top: 1px solid #1e1e35; padding: 20px 0; }
.share-bar { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.share-btn {
  background: #1A1A2E;
  border: 1px solid #2a2a4a;
  color: #AAA;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: .82rem;
  cursor: pointer;
  transition: all .2s;
}
.share-btn:hover { border-color: #E74C3C; color: #E74C3C; }

/* ---- 底部ICP备案 ---- */
.footer-icp { border-top: 1px solid #1e1e35; padding: 16px 0; text-align: center; }
.footer-icp a { color: #555; font-size: .78rem; }
.footer-icp a:hover { color: #E74C3C; }

/* ---- 关于页响应式 ---- */
@media (max-width: 768px) {
  .about-intro-grid { grid-template-columns: 1fr !important; }
  .timeline::before { left: 50px; }
  .timeline-item::before { left: 44px; }
  .timeline-year { min-width: 40px; font-size: .85rem; }
  .timeline-content { padding: 12px 14px; }
  .qr-row { flex-direction: column; align-items: center; }
}