/* ============================
   香蕉视频 - 主样式文件
   ============================ */

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #f5c518;
  --primary-dark: #e0a800;
  --primary-light: #fff9e0;
  --secondary: #1a1a2e;
  --accent: #ff6b35;
  --text-main: #222;
  --text-sub: #555;
  --text-light: #888;
  --bg-light: #f8f8f8;
  --bg-white: #fff;
  --border: #e5e5e5;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-hover: 0 6px 24px rgba(0,0,0,0.14);
  --transition: 0.25s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text-main);
  background: var(--bg-light);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

a:hover { color: var(--primary-dark); }

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol { list-style: none; }

/* ============================
   顶部公告栏
   ============================ */
.top-notice {
  background: var(--secondary);
  color: #fff;
  text-align: center;
  font-size: 13px;
  padding: 6px 16px;
  letter-spacing: 0.5px;
}

.top-notice a { color: var(--primary); }

/* ============================
   头部导航
   ============================ */
.site-header {
  background: var(--bg-white);
  border-bottom: 3px solid var(--primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--secondary);
}

.site-logo img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 8px;
}

.site-logo span { color: var(--primary-dark); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav a {
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  transition: background var(--transition), color var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  background: var(--primary-light);
  color: var(--primary-dark);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-submit {
  background: var(--primary);
  color: var(--secondary);
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition);
}

.btn-submit:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

/* ============================
   搜索栏
   ============================ */
.search-bar-wrap {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
}

.search-bar-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-form {
  display: flex;
  flex: 1;
  max-width: 600px;
  border: 2px solid var(--primary);
  border-radius: 24px;
  overflow: hidden;
  background: var(--bg-white);
}

.search-form input {
  flex: 1;
  border: none;
  outline: none;
  padding: 10px 18px;
  font-size: 15px;
  font-family: inherit;
  background: transparent;
}

.search-form button {
  background: var(--primary);
  border: none;
  padding: 10px 22px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--secondary);
  transition: background var(--transition);
}

.search-form button:hover { background: var(--primary-dark); }

.search-hot-tags {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-light);
  flex-wrap: wrap;
}

.search-hot-tags span { color: var(--text-sub); }

.hot-tag {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 3px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.hot-tag:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary-dark);
}

/* ============================
   面包屑
   ============================ */
.breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 20px;
  font-size: 13px;
  color: var(--text-light);
}

.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--primary-dark); }
.breadcrumb span { margin: 0 6px; }

/* ============================
   主体布局
   ============================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.main-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 24px;
  padding: 24px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

/* ============================
   首屏 Hero
   ============================ */
.hero-section {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  margin-bottom: 24px;
  max-height: 420px;
}

.hero-section img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(26,26,46,0.85) 40%, transparent);
  display: flex;
  align-items: center;
  padding: 40px;
}

.hero-content {
  max-width: 520px;
  color: #fff;
}

.hero-badge {
  display: inline-block;
  background: var(--primary);
  color: var(--secondary);
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.hero-content h1 {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 12px;
}

.hero-content p {
  font-size: 15px;
  opacity: 0.88;
  margin-bottom: 20px;
}

.hero-stats {
  display: flex;
  gap: 24px;
  margin-bottom: 20px;
}

.hero-stat {
  text-align: center;
}

.hero-stat .num {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary);
}

.hero-stat .label {
  font-size: 12px;
  opacity: 0.8;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary);
  color: var(--secondary);
  padding: 12px 24px;
  border-radius: 24px;
  font-size: 15px;
  font-weight: 700;
  transition: background var(--transition), transform var(--transition);
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: var(--secondary);
  transform: translateY(-2px);
}

/* ============================
   模块通用样式
   ============================ */
.section-block {
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 24px;
  overflow: hidden;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px 14px;
  border-bottom: 2px solid var(--primary-light);
}

.section-title-group {}

.section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 18px;
  background: var(--primary);
  border-radius: 2px;
}

.section-subtitle {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 2px;
}

.view-more {
  font-size: 13px;
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.view-more:hover { color: var(--accent); }

.section-body { padding: 16px 20px; }

/* ============================
   视频卡片
   ============================ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.video-grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.video-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.video-grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.video-card {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-white);
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition), transform var(--transition);
  cursor: pointer;
}

.video-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.video-thumb {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  overflow: hidden;
  background: #111;
}

.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);
}

.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  background: rgba(0,0,0,0.35);
  transition: opacity var(--transition);
}

.video-card:hover .play-btn { opacity: 1; }

.play-btn svg {
  width: 54px;
  height: 54px;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.5));
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.72);
  color: #fff;
  font-size: 12px;
  padding: 2px 7px;
  border-radius: 4px;
}

.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: var(--secondary);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

.video-info {
  padding: 12px;
}

.video-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--text-main);
}

.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-light);
}

.video-author {
  display: flex;
  align-items: center;
  gap: 5px;
}

.video-author img {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  object-fit: cover;
}

.video-stats {
  display: flex;
  gap: 10px;
}

.video-stats span {
  display: flex;
  align-items: center;
  gap: 3px;
}

/* ============================
   文章列表
   ============================ */
.article-list { }

.article-item {
  display: flex;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.article-item:last-child { border-bottom: none; }

.article-item:hover { background: var(--primary-light); margin: 0 -20px; padding: 14px 20px; border-radius: var(--radius); }

.article-thumb {
  flex-shrink: 0;
  width: 120px;
  height: 80px;
  border-radius: 6px;
  overflow: hidden;
}

.article-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-content { flex: 1; }

.article-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-desc {
  font-size: 13px;
  color: var(--text-sub);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-light);
}

.article-tag {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

/* ============================
   作者卡片
   ============================ */
.author-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.author-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 16px;
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition);
}

.author-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.author-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 10px;
  border: 3px solid var(--primary);
}

.author-name {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.author-desc {
  font-size: 12px;
  color: var(--text-sub);
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.author-stats {
  display: flex;
  justify-content: center;
  gap: 16px;
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 12px;
}

.author-stats strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
}

.btn-follow {
  display: inline-block;
  background: var(--primary);
  color: var(--secondary);
  padding: 6px 20px;
  border-radius: 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background var(--transition);
}

.btn-follow:hover { background: var(--primary-dark); }

/* ============================
   侧边栏
   ============================ */
.sidebar { }

.sidebar-block {
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  overflow: hidden;
}

.sidebar-title {
  font-size: 15px;
  font-weight: 700;
  padding: 14px 16px;
  border-bottom: 2px solid var(--primary-light);
  display: flex;
  align-items: center;
  gap: 6px;
}

.sidebar-title::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 15px;
  background: var(--primary);
  border-radius: 2px;
}

.sidebar-body { padding: 12px 16px; }

.hot-rank-list { }

.hot-rank-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

.hot-rank-item:last-child { border-bottom: none; }

.rank-num {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: var(--bg-light);
  color: var(--text-light);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.rank-num.top1 { background: #ff4757; color: #fff; }
.rank-num.top2 { background: #ff6b35; color: #fff; }
.rank-num.top3 { background: var(--primary); color: var(--secondary); }

.rank-title {
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.rank-views { font-size: 12px; color: var(--text-light); flex-shrink: 0; }

/* ============================
   评论区
   ============================ */
.comment-section {
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 24px;
}

.comment-form {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.comment-form textarea {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  min-height: 70px;
  outline: none;
  transition: border-color var(--transition);
}

.comment-form textarea:focus { border-color: var(--primary); }

.btn-comment {
  background: var(--primary);
  color: var(--secondary);
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  align-self: flex-end;
  transition: background var(--transition);
}

.btn-comment:hover { background: var(--primary-dark); }

.comment-list { }

.comment-item {
  display: flex;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.comment-item:last-child { border-bottom: none; }

.comment-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: var(--primary-dark);
  flex-shrink: 0;
}

.comment-body { flex: 1; }

.comment-user {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.comment-text {
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 8px;
}

.comment-footer {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--text-light);
}

.comment-like {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  transition: color var(--transition);
}

.comment-like:hover { color: var(--accent); }

/* ============================
   FAQ
   ============================ */
.faq-list { }

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
}

.faq-question {
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-white);
  transition: background var(--transition);
}

.faq-question:hover { background: var(--primary-light); }

.faq-question.active { background: var(--primary-light); color: var(--primary-dark); }

.faq-arrow {
  transition: transform var(--transition);
  font-size: 12px;
}

.faq-question.active .faq-arrow { transform: rotate(180deg); }

.faq-answer {
  display: none;
  padding: 14px 18px;
  font-size: 14px;
  color: var(--text-sub);
  border-top: 1px solid var(--border);
  background: var(--bg-light);
  line-height: 1.8;
}

.faq-answer.open { display: block; }

/* ============================
   专题卡片
   ============================ */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px;
}

.topic-card {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition), transform var(--transition);
}

.topic-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.topic-card img {
  width: 100%;
  height: 120px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.topic-card:hover img { transform: scale(1.06); }

.topic-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.75));
  padding: 20px 12px 10px;
  color: #fff;
}

.topic-name {
  font-size: 14px;
  font-weight: 700;
}

.topic-count {
  font-size: 11px;
  opacity: 0.8;
}

/* ============================
   页脚
   ============================ */
.site-footer {
  background: var(--secondary);
  color: rgba(255,255,255,0.75);
  margin-top: 40px;
}

.footer-top {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px 30px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-brand {}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.footer-logo img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 8px;
}

.footer-desc {
  font-size: 13px;
  line-height: 1.8;
  margin-bottom: 16px;
}

.footer-domain {
  font-size: 13px;
  color: var(--primary);
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--primary); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 16px 20px;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--primary); }

/* ============================
   互动按钮
   ============================ */
.action-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 12px 0;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 14px;
  border-radius: 20px;
  font-size: 13px;
  border: 1px solid var(--border);
  cursor: pointer;
  background: var(--bg-white);
  color: var(--text-sub);
  transition: all var(--transition);
}

.action-btn:hover,
.action-btn.active {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary-dark);
}

/* ============================
   标签
   ============================ */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0;
}

.tag {
  background: var(--bg-light);
  border: 1px solid var(--border);
  color: var(--text-sub);
  padding: 4px 12px;
  border-radius: 14px;
  font-size: 12px;
  cursor: pointer;
  transition: all var(--transition);
}

.tag:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary-dark);
}

/* ============================
   通知/徽章
   ============================ */
.badge {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 8px;
  vertical-align: middle;
}

.badge-yellow {
  background: var(--primary);
  color: var(--secondary);
}

/* ============================
   分页
   ============================ */
.pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  padding: 20px 0;
}

.page-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  cursor: pointer;
  background: var(--bg-white);
  transition: all var(--transition);
}

.page-btn:hover,
.page-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--secondary);
  font-weight: 700;
}

/* ============================
   响应式
   ============================ */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  .sidebar { display: none; }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .video-grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .header-inner { height: 56px; }
  .site-logo { font-size: 18px; }
  .site-logo img { width: 36px; height: 36px; }
  .main-nav { display: none; }
  .hero-content h1 { font-size: 22px; }
  .hero-section img { height: 260px; }
  .hero-section { max-height: 260px; }
  .hero-overlay { padding: 20px; }
  .video-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .video-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .author-grid { grid-template-columns: repeat(2, 1fr); }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr; gap: 20px; padding: 24px 20px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .search-hot-tags { display: none; }
}

@media (max-width: 480px) {
  .video-grid-2,
  .video-grid-3,
  .video-grid-4 { grid-template-columns: 1fr; }
  .hero-stats { gap: 14px; }
  .hero-stat .num { font-size: 18px; }
}

/* ============================
   懒加载占位
   ============================ */
img[data-src] {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ============================
   内页通用
   ============================ */
.page-hero {
  background: linear-gradient(135deg, var(--secondary) 0%, #2d2d5e 100%);
  color: #fff;
  padding: 40px 20px;
  text-align: center;
}

.page-hero h1 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 8px;
}

.page-hero p {
  font-size: 15px;
  opacity: 0.8;
}

.content-page {
  max-width: 900px;
  margin: 30px auto;
  padding: 0 20px;
}

.content-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px;
  margin-bottom: 24px;
}

.content-card h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

.content-card p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.9;
  margin-bottom: 12px;
}

/* 移动端汉堡菜单 */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition);
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: flex; }
}

/* 搜索提示 */
.search-no-result {
  display: none;
  background: var(--primary-light);
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 14px;
  color: var(--primary-dark);
  margin-top: 8px;
}