/* 51吃瓜 - 主样式文件 */
:root {
  --primary: #e8192c;
  --primary-dark: #c0141f;
  --secondary: #ff6b35;
  --dark: #1a1a2e;
  --gray: #6c757d;
  --light-gray: #f8f9fa;
  --border: #e9ecef;
  --text: #333;
  --white: #fff;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --radius: 8px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', sans-serif;
  font-size: 15px;
  color: var(--text);
  background: #f5f5f5;
  line-height: 1.7;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }
.row { display: flex; flex-wrap: wrap; gap: 20px; }
.col-main { flex: 1; min-width: 0; }
.col-side { width: 300px; flex-shrink: 0; }

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: var(--dark);
  color: #aaa;
  font-size: 12px;
  padding: 6px 0;
}
.top-bar .container { display: flex; justify-content: space-between; align-items: center; }
.top-bar a { color: #ccc; }
.top-bar a:hover { color: var(--primary); }

/* ===== 头部 ===== */
.site-header {
  background: var(--white);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 20px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  width: 44px;
  height: 44px;
  background: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 20px;
  font-weight: 900;
}
.logo-text { line-height: 1.2; }
.logo-text strong { font-size: 22px; color: var(--primary); display: block; }
.logo-text span { font-size: 11px; color: var(--gray); }

/* ===== 导航 ===== */
.main-nav { background: var(--primary); }
.main-nav .container { display: flex; align-items: center; }
.nav-list { display: flex; }
.nav-list li a {
  display: block;
  padding: 12px 18px;
  color: rgba(255,255,255,0.9);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}
.nav-list li a:hover,
.nav-list li.active a {
  background: rgba(0,0,0,0.2);
  color: #fff;
}
.nav-hot { background: var(--secondary) !important; border-radius: 3px; }

/* ===== 搜索框 ===== */
.search-bar {
  background: #fff3f3;
  border-bottom: 1px solid #ffd0d0;
  padding: 10px 0;
}
.search-form {
  display: flex;
  max-width: 600px;
  margin: 0 auto;
  border: 2px solid var(--primary);
  border-radius: 25px;
  overflow: hidden;
  background: #fff;
}
.search-form input {
  flex: 1;
  border: none;
  outline: none;
  padding: 8px 18px;
  font-size: 14px;
  font-family: inherit;
}
.search-form button {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 8px 22px;
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  transition: background 0.2s;
}
.search-form button:hover { background: var(--primary-dark); }
.search-tips {
  text-align: center;
  margin-top: 6px;
  font-size: 12px;
  color: var(--gray);
}
.search-tips a {
  color: var(--primary);
  margin: 0 5px;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 10px 0;
  font-size: 13px;
  color: var(--gray);
}
.breadcrumb a { color: var(--gray); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ===== 主内容区 ===== */
.main-content { padding: 20px 0 40px; }

/* ===== 区块标题 ===== */
.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary);
}
.section-title h2 {
  font-size: 18px;
  color: var(--dark);
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-title h2::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 18px;
  background: var(--primary);
  border-radius: 2px;
}
.section-title a {
  font-size: 13px;
  color: var(--gray);
}
.section-title a:hover { color: var(--primary); }

/* ===== 头条区 ===== */
.headline-section { margin-bottom: 24px; }
.headline-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.headline-main {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--dark);
}
.headline-main img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  opacity: 0.85;
  transition: opacity 0.3s;
}
.headline-main:hover img { opacity: 1; }
.headline-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: #fff;
}
.headline-overlay .tag {
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 3px;
  display: inline-block;
  margin-bottom: 8px;
}
.headline-overlay h3 { font-size: 18px; line-height: 1.4; margin-bottom: 6px; }
.headline-overlay .meta { font-size: 12px; color: rgba(255,255,255,0.7); }
.headline-sub { display: flex; flex-direction: column; gap: 12px; }
.headline-sub-item {
  display: flex;
  gap: 12px;
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}
.headline-sub-item:hover { transform: translateY(-2px); }
.headline-sub-item img {
  width: 120px;
  height: 90px;
  object-fit: cover;
  flex-shrink: 0;
}
.headline-sub-info {
  padding: 10px 12px 10px 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.headline-sub-info h4 { font-size: 14px; line-height: 1.5; color: var(--dark); }
.headline-sub-info .meta { font-size: 12px; color: var(--gray); }

/* ===== 热点资讯 ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.news-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}
.news-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.12);
}
.news-card-img {
  position: relative;
  overflow: hidden;
}
.news-card-img img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  transition: transform 0.3s;
}
.news-card:hover .news-card-img img { transform: scale(1.05); }
.news-card-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 3px;
}
.news-card-body { padding: 14px; }
.news-card-body h3 {
  font-size: 15px;
  line-height: 1.5;
  margin-bottom: 8px;
  color: var(--dark);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card-body p {
  font-size: 13px;
  color: var(--gray);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 10px;
}
.news-card-meta {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--gray);
}
.news-card-stats { display: flex; gap: 10px; }
.news-card-stats span { display: flex; align-items: center; gap: 3px; }

/* ===== 视频区 ===== */
.video-section { margin: 24px 0; }
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.video-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}
.video-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}
.video-thumb {
  position: relative;
  overflow: hidden;
  background: var(--dark);
}
.video-thumb img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  transition: transform 0.3s, opacity 0.3s;
}
.video-card:hover .video-thumb img {
  transform: scale(1.05);
  opacity: 0.8;
}
.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 48px;
  height: 48px;
  background: rgba(232,25,44,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.25s ease;
  color: #fff;
  font-size: 18px;
}
.video-card:hover .video-play-btn { transform: translate(-50%, -50%) scale(1); }
.video-duration {
  position: absolute;
  bottom: 6px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 11px;
  padding: 1px 5px;
  border-radius: 3px;
}
.video-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 3px;
}
.video-info { padding: 10px 12px 12px; }
.video-info h4 {
  font-size: 13px;
  line-height: 1.5;
  color: var(--dark);
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--gray);
}
.video-stats { display: flex; gap: 8px; }

/* ===== 行业观察 ===== */
.industry-list { display: flex; flex-direction: column; gap: 12px; }
.industry-item {
  display: flex;
  gap: 14px;
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  padding: 12px;
  transition: transform 0.2s;
}
.industry-item:hover { transform: translateX(4px); }
.industry-item img {
  width: 100px;
  height: 72px;
  object-fit: cover;
  border-radius: 6px;
  flex-shrink: 0;
}
.industry-info { flex: 1; }
.industry-info h4 { font-size: 14px; line-height: 1.5; margin-bottom: 4px; }
.industry-info p { font-size: 12px; color: var(--gray); line-height: 1.5; }
.industry-info .meta { font-size: 11px; color: var(--gray); margin-top: 4px; }

/* ===== 专题策划 ===== */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.topic-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--dark);
  height: 160px;
}
.topic-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.7;
  transition: opacity 0.3s, transform 0.3s;
}
.topic-card:hover img { opacity: 0.85; transform: scale(1.05); }
.topic-overlay {
  position: absolute;
  inset: 0;
  padding: 16px;
  background: linear-gradient(135deg, rgba(232,25,44,0.7), rgba(0,0,0,0.5));
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  color: #fff;
}
.topic-overlay .label {
  font-size: 11px;
  background: rgba(255,255,255,0.2);
  padding: 2px 8px;
  border-radius: 3px;
  display: inline-block;
  margin-bottom: 6px;
  width: fit-content;
}
.topic-overlay h3 { font-size: 16px; margin-bottom: 4px; }
.topic-overlay p { font-size: 12px; opacity: 0.85; }

/* ===== 热门阅读 ===== */
.hot-list { display: flex; flex-direction: column; }
.hot-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.hot-item:last-child { border-bottom: none; }
.hot-rank {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  background: var(--light-gray);
  color: var(--gray);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.hot-item:nth-child(1) .hot-rank { background: var(--primary); color: #fff; }
.hot-item:nth-child(2) .hot-rank { background: #ff6b35; color: #fff; }
.hot-item:nth-child(3) .hot-rank { background: #ffc107; color: #fff; }
.hot-info h4 { font-size: 14px; line-height: 1.5; margin-bottom: 3px; }
.hot-info .meta { font-size: 12px; color: var(--gray); }

/* ===== 推荐作者 ===== */
.author-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.author-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}
.author-card:hover { transform: translateY(-3px); }
.author-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 10px;
  border: 3px solid var(--border);
}
.author-card h4 { font-size: 14px; margin-bottom: 4px; }
.author-card .role { font-size: 12px; color: var(--primary); margin-bottom: 6px; }
.author-card .desc { font-size: 12px; color: var(--gray); line-height: 1.5; }
.author-card .stats { font-size: 11px; color: var(--gray); margin-top: 8px; }
.follow-btn {
  display: inline-block;
  margin-top: 10px;
  padding: 5px 16px;
  border: 1px solid var(--primary);
  color: var(--primary);
  border-radius: 20px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.follow-btn:hover { background: var(--primary); color: #fff; }

/* ===== FAQ ===== */
.faq-list { display: flex; flex-direction: column; gap: 10px; }
.faq-item {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.faq-question {
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--dark);
  user-select: none;
}
.faq-question:hover { color: var(--primary); }
.faq-question::after {
  content: '+';
  font-size: 20px;
  color: var(--primary);
  transition: transform 0.3s;
  flex-shrink: 0;
}
.faq-item.open .faq-question::after { transform: rotate(45deg); }
.faq-answer {
  display: none;
  padding: 0 18px 14px;
  font-size: 14px;
  color: var(--gray);
  line-height: 1.8;
  border-top: 1px solid var(--border);
}
.faq-item.open .faq-answer { display: block; }

/* ===== 用户评论 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.review-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}
.review-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}
.review-user h5 { font-size: 14px; margin-bottom: 2px; }
.review-stars { color: #ffc107; font-size: 13px; }
.review-text { font-size: 13px; color: var(--gray); line-height: 1.7; }
.review-date { font-size: 11px; color: #bbb; margin-top: 8px; }

/* ===== 侧边栏 ===== */
.sidebar-widget {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  overflow: hidden;
}
.widget-title {
  background: var(--primary);
  color: #fff;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
}
.widget-body { padding: 14px 16px; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
  background: var(--light-gray);
  color: var(--gray);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 20px;
  transition: all 0.2s;
}
.tag-item:hover { background: var(--primary); color: #fff; }
.sidebar-news-list { display: flex; flex-direction: column; }
.sidebar-news-item {
  display: flex;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.sidebar-news-item:last-child { border-bottom: none; }
.sidebar-news-item img {
  width: 72px;
  height: 52px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
}
.sidebar-news-item h5 { font-size: 13px; line-height: 1.5; color: var(--dark); }
.sidebar-news-item .meta { font-size: 11px; color: var(--gray); margin-top: 3px; }

/* ===== 联系/投稿 ===== */
.contact-section {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border-radius: var(--radius);
  padding: 30px;
  text-align: center;
  margin: 24px 0;
}
.contact-section h2 { font-size: 22px; margin-bottom: 10px; }
.contact-section p { font-size: 14px; opacity: 0.9; margin-bottom: 20px; }
.contact-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn-white {
  background: #fff;
  color: var(--primary);
  padding: 10px 24px;
  border-radius: 25px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s;
}
.btn-white:hover { background: var(--dark); color: #fff; }
.btn-outline {
  border: 2px solid #fff;
  color: #fff;
  padding: 10px 24px;
  border-radius: 25px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s;
}
.btn-outline:hover { background: rgba(255,255,255,0.2); }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--dark);
  color: rgba(255,255,255,0.7);
  padding: 40px 0 0;
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 30px;
  padding-bottom: 30px;
}
.footer-brand .logo-text strong { color: #fff; font-size: 20px; }
.footer-brand p { font-size: 13px; line-height: 1.8; margin: 12px 0; }
.footer-col h4 {
  color: #fff;
  font-size: 14px;
  margin-bottom: 14px;
  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: 13px; color: rgba(255,255,255,0.6); }
.footer-col ul li a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 16px 0;
  text-align: center;
  font-size: 12px;
  color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: rgba(255,255,255,0.5); margin: 0 8px; }
.footer-bottom a:hover { color: var(--primary); }

/* ===== 滚动公告 ===== */
.ticker-wrap {
  background: #fff8f8;
  border-bottom: 1px solid #ffd0d0;
  padding: 8px 0;
  overflow: hidden;
}
.ticker-label {
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 3px;
  margin-right: 12px;
  flex-shrink: 0;
}
.ticker-inner { display: flex; align-items: center; }
.ticker-content {
  overflow: hidden;
  flex: 1;
}
.ticker-text {
  white-space: nowrap;
  font-size: 13px;
  color: var(--text);
  animation: ticker 30s linear infinite;
}
.ticker-text a { margin-right: 40px; color: var(--text); }
.ticker-text a:hover { color: var(--primary); }
@keyframes ticker {
  0% { transform: translateX(100%); }
  100% { transform: translateX(-100%); }
}

/* ===== 分页 ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin: 24px 0;
}
.page-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
}
.page-btn:hover, .page-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .col-side { width: 260px; }
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .headline-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .topic-grid { grid-template-columns: 1fr; }
  .author-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: 1fr; }
  .row { flex-direction: column; }
  .col-side { width: 100%; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-list li a { padding: 10px 12px; font-size: 13px; }
}
@media (max-width: 480px) {
  .news-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .author-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .header-inner { flex-wrap: wrap; }
}