/* ===================================================
   17c官网 - 主样式文件
   域名: www.5uobswa.cn
   =================================================== */

/* ---- 重置与基础 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: #222;
  background: #f5f6fa;
  line-height: 1.7;
}
a { color: #e84118; text-decoration: none; transition: color .2s; }
a:hover { color: #c0392b; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ---- 容器 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }
.section { padding: 40px 0; }
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a1a2e;
  border-left: 4px solid #e84118;
  padding-left: 12px;
  margin-bottom: 24px;
}
.section-title span { color: #e84118; }

/* ---- 顶部公告栏 ---- */
.top-bar {
  background: #1a1a2e;
  color: #ccc;
  font-size: .8rem;
  padding: 6px 0;
}
.top-bar .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 6px; }
.top-bar a { color: #e84118; }

/* ---- 页头 ---- */
.site-header {
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,.08);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  flex-wrap: wrap;
  gap: 12px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-img { width: 48px; height: 48px; border-radius: 8px; }
.logo-text { font-size: 1.6rem; font-weight: 900; color: #e84118; letter-spacing: -1px; }
.logo-sub { font-size: .75rem; color: #888; display: block; }
.header-right { display: flex; align-items: center; gap: 16px; }
.header-tag {
  background: #e84118;
  color: #fff;
  font-size: .75rem;
  padding: 3px 10px;
  border-radius: 20px;
  white-space: nowrap;
}

/* ---- 导航 ---- */
.main-nav { background: #1a1a2e; }
.nav-list { display: flex; flex-wrap: wrap; }
.nav-list li a {
  display: block;
  color: #ddd;
  padding: 12px 18px;
  font-size: .9rem;
  font-weight: 500;
  transition: background .2s, color .2s;
}
.nav-list li a:hover,
.nav-list li a.active { background: #e84118; color: #fff; }
.nav-list li a .nav-badge {
  background: #e84118;
  color: #fff;
  font-size: .65rem;
  padding: 1px 5px;
  border-radius: 10px;
  margin-left: 4px;
  vertical-align: middle;
}
.nav-list li a.active .nav-badge { background: #fff; color: #e84118; }

/* ---- 搜索框 ---- */
.search-bar {
  background: #f0f2f5;
  padding: 12px 0;
  border-bottom: 1px solid #e0e0e0;
}
.search-inner {
  display: flex;
  align-items: center;
  max-width: 600px;
  margin: 0 auto;
  background: #fff;
  border: 2px solid #e84118;
  border-radius: 30px;
  overflow: hidden;
  padding: 0 4px 0 16px;
}
.search-inner input {
  flex: 1;
  border: none;
  outline: none;
  font-size: .95rem;
  padding: 8px 0;
  background: transparent;
  color: #333;
}
.search-inner button {
  background: #e84118;
  color: #fff;
  border: none;
  padding: 8px 20px;
  border-radius: 26px;
  cursor: pointer;
  font-size: .9rem;
  font-weight: 600;
  transition: background .2s;
}
.search-inner button:hover { background: #c0392b; }

/* ---- 面包屑 ---- */
.breadcrumb {
  background: #fff;
  padding: 8px 0;
  font-size: .82rem;
  color: #888;
  border-bottom: 1px solid #eee;
}
.breadcrumb a { color: #e84118; }
.breadcrumb span { margin: 0 6px; }

/* ---- 英雄横幅 ---- */
.hero-banner {
  position: relative;
  overflow: hidden;
  background: #1a1a2e;
  max-height: 420px;
}
.hero-banner img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  opacity: .85;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 60px;
  background: linear-gradient(90deg, rgba(26,26,46,.85) 40%, transparent);
}
.hero-overlay h1 { font-size: 2.2rem; color: #fff; font-weight: 900; line-height: 1.3; }
.hero-overlay p { color: #eee; font-size: 1rem; margin: 10px 0 20px; max-width: 480px; }
.btn-primary {
  display: inline-block;
  background: #e84118;
  color: #fff;
  padding: 10px 28px;
  border-radius: 30px;
  font-weight: 700;
  font-size: .95rem;
  transition: background .2s, transform .2s;
}
.btn-primary:hover { background: #c0392b; color: #fff; transform: translateY(-2px); }
.btn-outline {
  display: inline-block;
  border: 2px solid #e84118;
  color: #e84118;
  padding: 8px 22px;
  border-radius: 30px;
  font-weight: 600;
  font-size: .9rem;
  transition: all .2s;
}
.btn-outline:hover { background: #e84118; color: #fff; }

/* ---- 热点滚动条 ---- */
.hot-ticker {
  background: #fff;
  border-bottom: 2px solid #e84118;
  padding: 8px 0;
  overflow: hidden;
}
.ticker-inner { display: flex; align-items: center; gap: 16px; }
.ticker-label {
  background: #e84118;
  color: #fff;
  font-size: .8rem;
  padding: 3px 12px;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}
.ticker-track {
  overflow: hidden;
  flex: 1;
}
.ticker-list {
  display: flex;
  gap: 40px;
  animation: ticker 30s linear infinite;
  white-space: nowrap;
}
.ticker-list a { font-size: .85rem; color: #444; }
.ticker-list a:hover { color: #e84118; }
@keyframes ticker { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* ---- 主体两栏布局 ---- */
.main-layout { display: grid; grid-template-columns: 1fr 320px; gap: 24px; padding: 24px 0; }
.main-content { min-width: 0; }
.sidebar { min-width: 0; }

/* ---- 头条新闻 ---- */
.headline-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.headline-main { position: relative; border-radius: 10px; overflow: hidden; }
.headline-main img { width: 100%; height: 260px; object-fit: cover; transition: transform .4s; }
.headline-main:hover img { transform: scale(1.04); }
.headline-caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,.75));
  padding: 30px 16px 14px;
}
.headline-caption h2 { color: #fff; font-size: 1.1rem; line-height: 1.4; }
.headline-caption .meta { color: #ccc; font-size: .75rem; margin-top: 4px; }
.headline-sub { display: flex; flex-direction: column; gap: 10px; }
.headline-sub-item {
  display: flex;
  gap: 10px;
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
  transition: box-shadow .2s;
}
.headline-sub-item:hover { box-shadow: 0 4px 12px rgba(0,0,0,.12); }
.headline-sub-item img { width: 100px; height: 70px; object-fit: cover; flex-shrink: 0; }
.headline-sub-info { padding: 8px; flex: 1; }
.headline-sub-info h3 { font-size: .88rem; color: #222; line-height: 1.4; }
.headline-sub-info .meta { font-size: .75rem; color: #999; margin-top: 4px; }

/* ---- 视频卡片区 ---- */
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.video-card {
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,.07);
  transition: box-shadow .25s, transform .25s;
  cursor: pointer;
}
.video-card:hover { box-shadow: 0 6px 20px rgba(0,0,0,.14); transform: translateY(-4px); }
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: #111;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s, opacity .3s;
}
.video-card:hover .video-thumb img { transform: scale(1.06); opacity: .85; }
.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity .3s;
}
.video-card:hover .play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(232,65,24,.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,.4);
  transition: transform .2s;
}
.play-icon:hover { transform: scale(1.1); }
.play-icon svg { width: 22px; height: 22px; fill: #fff; margin-left: 4px; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,.75);
  color: #fff;
  font-size: .72rem;
  padding: 2px 6px;
  border-radius: 4px;
}
.video-views {
  position: absolute;
  bottom: 8px;
  left: 8px;
  background: rgba(0,0,0,.6);
  color: #fff;
  font-size: .7rem;
  padding: 2px 6px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 3px;
}
.video-info { padding: 12px; }
.video-info h3 { font-size: .9rem; color: #1a1a2e; line-height: 1.4; margin-bottom: 6px; }
.video-meta { display: flex; justify-content: space-between; font-size: .75rem; color: #999; }
.video-stats { display: flex; gap: 10px; font-size: .75rem; color: #bbb; margin-top: 6px; }
.video-stats span { display: flex; align-items: center; gap: 3px; }
.video-tag {
  display: inline-block;
  background: #fff0ec;
  color: #e84118;
  font-size: .7rem;
  padding: 2px 8px;
  border-radius: 10px;
  margin-top: 6px;
}

/* ---- 热点资讯列表 ---- */
.news-list { display: flex; flex-direction: column; gap: 14px; }
.news-item {
  display: flex;
  gap: 14px;
  background: #fff;
  border-radius: 8px;
  padding: 12px;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
  transition: box-shadow .2s;
}
.news-item:hover { box-shadow: 0 4px 14px rgba(0,0,0,.1); }
.news-item img { width: 120px; height: 80px; object-fit: cover; border-radius: 6px; flex-shrink: 0; }
.news-body { flex: 1; }
.news-body h3 { font-size: .95rem; color: #1a1a2e; line-height: 1.4; margin-bottom: 6px; }
.news-body p { font-size: .82rem; color: #666; line-height: 1.5; }
.news-meta { display: flex; gap: 12px; font-size: .75rem; color: #aaa; margin-top: 6px; flex-wrap: wrap; }
.news-meta .cat { color: #e84118; font-weight: 600; }
.news-meta .hot { color: #e84118; }

/* ---- 专题策划 ---- */
.topics-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.topic-card {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,.08);
}
.topic-card img { width: 100%; height: 180px; object-fit: cover; transition: transform .4s; }
.topic-card:hover img { transform: scale(1.05); }
.topic-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(transparent 30%, rgba(0,0,0,.7));
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 16px;
}
.topic-badge {
  background: #e84118;
  color: #fff;
  font-size: .7rem;
  padding: 2px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 6px;
  width: fit-content;
}
.topic-overlay h3 { color: #fff; font-size: 1rem; line-height: 1.4; }
.topic-overlay .meta { color: #ccc; font-size: .75rem; margin-top: 4px; }

/* ---- 热门阅读 ---- */
.hot-reads { display: flex; flex-direction: column; gap: 10px; }
.hot-read-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
  transition: box-shadow .2s;
}
.hot-read-item:hover { box-shadow: 0 3px 10px rgba(0,0,0,.1); }
.rank-num {
  width: 28px;
  height: 28px;
  background: #f0f0f0;
  color: #888;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  font-weight: 700;
  flex-shrink: 0;
}
.rank-num.top3 { background: #e84118; color: #fff; }
.hot-read-info h4 { font-size: .88rem; color: #1a1a2e; line-height: 1.4; }
.hot-read-info .meta { font-size: .75rem; color: #aaa; margin-top: 3px; }

/* ---- 推荐作者 ---- */
.authors-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.author-card {
  background: #fff;
  border-radius: 10px;
  padding: 20px 16px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,.07);
  transition: box-shadow .2s, transform .2s;
}
.author-card:hover { box-shadow: 0 6px 18px rgba(0,0,0,.12); transform: translateY(-3px); }
.author-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 10px;
  border: 3px solid #e84118;
}
.author-name { font-size: .95rem; font-weight: 700; color: #1a1a2e; }
.author-title { font-size: .78rem; color: #e84118; margin: 4px 0; }
.author-desc { font-size: .78rem; color: #888; line-height: 1.5; }
.author-stats { display: flex; justify-content: center; gap: 16px; margin-top: 10px; font-size: .75rem; color: #aaa; }
.author-stats strong { color: #e84118; display: block; font-size: .95rem; }
.btn-follow {
  display: inline-block;
  margin-top: 12px;
  border: 1.5px solid #e84118;
  color: #e84118;
  padding: 5px 18px;
  border-radius: 20px;
  font-size: .8rem;
  transition: all .2s;
}
.btn-follow:hover { background: #e84118; color: #fff; }

/* ---- FAQ ---- */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
  overflow: hidden;
}
.faq-q {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  cursor: pointer;
  font-weight: 600;
  color: #1a1a2e;
  font-size: .95rem;
  transition: background .2s;
}
.faq-q:hover { background: #fff5f3; }
.faq-q .q-icon { color: #e84118; font-size: 1.1rem; font-weight: 700; flex-shrink: 0; margin-right: 10px; }
.faq-q .arrow { color: #e84118; font-size: 1rem; transition: transform .3s; flex-shrink: 0; }
.faq-item.open .faq-q .arrow { transform: rotate(180deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, padding .3s;
  padding: 0 18px;
  font-size: .88rem;
  color: #555;
  line-height: 1.7;
}
.faq-item.open .faq-a { max-height: 300px; padding: 12px 18px 16px; }

/* ---- 用户评论 ---- */
.reviews-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.review-card {
  background: #fff;
  border-radius: 10px;
  padding: 18px;
  box-shadow: 0 2px 8px rgba(0,0,0,.07);
  border-left: 3px solid #e84118;
}
.review-header { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #e84118, #f39c12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}
.review-user strong { font-size: .9rem; color: #1a1a2e; display: block; }
.review-user span { font-size: .75rem; color: #aaa; }
.review-stars { color: #f39c12; font-size: .9rem; margin-bottom: 8px; }
.review-text { font-size: .85rem; color: #555; line-height: 1.6; }
.review-date { font-size: .75rem; color: #bbb; margin-top: 8px; }

/* ---- 投稿/联系 ---- */
.contact-section {
  background: linear-gradient(135deg, #1a1a2e 0%, #2c3e50 100%);
  color: #fff;
  padding: 50px 0;
  text-align: center;
}
.contact-section h2 { font-size: 1.8rem; margin-bottom: 12px; }
.contact-section p { color: #ccc; margin-bottom: 24px; font-size: .95rem; }
.contact-cards { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; margin-top: 24px; }
.contact-card {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 10px;
  padding: 20px 28px;
  min-width: 180px;
  text-align: center;
  transition: background .2s;
}
.contact-card:hover { background: rgba(255,255,255,.15); }
.contact-card .icon { font-size: 2rem; margin-bottom: 8px; }
.contact-card h4 { color: #fff; font-size: .95rem; margin-bottom: 4px; }
.contact-card p { color: #aaa; font-size: .82rem; margin: 0; }

/* ---- 侧边栏 ---- */
.sidebar-widget {
  background: #fff;
  border-radius: 10px;
  padding: 18px;
  box-shadow: 0 2px 8px rgba(0,0,0,.07);
  margin-bottom: 20px;
}
.widget-title {
  font-size: 1rem;
  font-weight: 700;
  color: #1a1a2e;
  border-bottom: 2px solid #e84118;
  padding-bottom: 8px;
  margin-bottom: 14px;
}
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
  background: #f5f6fa;
  color: #555;
  font-size: .78rem;
  padding: 4px 12px;
  border-radius: 20px;
  transition: all .2s;
  cursor: pointer;
}
.tag-item:hover { background: #e84118; color: #fff; }
.tag-item.hot { background: #fff0ec; color: #e84118; }
.sidebar-news { display: flex; flex-direction: column; gap: 12px; }
.sidebar-news-item { display: flex; gap: 10px; }
.sidebar-news-item img { width: 72px; height: 50px; object-fit: cover; border-radius: 5px; flex-shrink: 0; }
.sidebar-news-item h4 { font-size: .82rem; color: #1a1a2e; line-height: 1.4; }
.sidebar-news-item .meta { font-size: .72rem; color: #aaa; margin-top: 3px; }
.sidebar-rank { display: flex; flex-direction: column; gap: 10px; }
.sidebar-rank-item { display: flex; align-items: center; gap: 10px; }
.s-rank { width: 22px; height: 22px; background: #f0f0f0; color: #888; border-radius: 4px; display: flex; align-items: center; justify-content: center; font-size: .75rem; font-weight: 700; flex-shrink: 0; }
.s-rank.r1 { background: #e84118; color: #fff; }
.s-rank.r2 { background: #e67e22; color: #fff; }
.s-rank.r3 { background: #f39c12; color: #fff; }
.sidebar-rank-item span { font-size: .82rem; color: #333; line-height: 1.4; }
.sidebar-rank-item span:hover { color: #e84118; cursor: pointer; }

/* ---- 社交分享 ---- */
.share-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.share-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .2s;
}
.share-btn:hover { opacity: .85; }
.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-qq { background: #1d6fa4; color: #fff; }
.share-link { background: #555; color: #fff; }

/* ---- 页脚 ---- */
.site-footer { background: #1a1a2e; color: #aaa; padding: 40px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; padding-bottom: 32px; }
.footer-brand .logo-text { color: #e84118; font-size: 1.4rem; }
.footer-brand p { font-size: .82rem; margin-top: 10px; line-height: 1.7; color: #888; }
.footer-col h4 { color: #fff; font-size: .95rem; margin-bottom: 14px; font-weight: 700; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { color: #888; font-size: .82rem; transition: color .2s; }
.footer-col ul li a:hover { color: #e84118; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 16px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: .78rem;
}
.footer-bottom a { color: #888; }
.footer-bottom a:hover { color: #e84118; }
.update-time { color: #e84118; font-size: .78rem; }

/* ---- 返回顶部 ---- */
#back-top {
  position: fixed;
  bottom: 30px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: #e84118;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(232,65,24,.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s, transform .3s;
  z-index: 999;
}
#back-top.show { opacity: 1; pointer-events: all; }
#back-top:hover { transform: translateY(-3px); }

/* ---- 标签页 ---- */
.tab-nav { display: flex; border-bottom: 2px solid #eee; margin-bottom: 16px; }
.tab-btn {
  padding: 8px 18px;
  font-size: .88rem;
  color: #888;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color .2s, border-color .2s;
}
.tab-btn.active { color: #e84118; border-color: #e84118; font-weight: 700; }

/* ---- 分页 ---- */
.pagination { display: flex; gap: 6px; justify-content: center; margin-top: 24px; }
.page-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: #fff;
  color: #555;
  font-size: .88rem;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
  cursor: pointer;
  transition: all .2s;
}
.page-btn:hover, .page-btn.active { background: #e84118; color: #fff; }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .main-layout { grid-template-columns: 1fr; }
  .sidebar { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .hero-overlay { padding: 0 24px; }
  .hero-overlay h1 { font-size: 1.4rem; }
  .headline-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .topics-grid { grid-template-columns: 1fr; }
  .authors-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .sidebar { grid-template-columns: 1fr; }
  .nav-list { overflow-x: auto; flex-wrap: nowrap; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .authors-grid { grid-template-columns: 1fr; }
  .hero-banner { max-height: 280px; }
  .hero-banner img { height: 280px; }
  .hero-overlay h1 { font-size: 1.2rem; }
}