/* ============================================================
   Base — 全局基础样式
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333333;
  background-color: #f5f5f5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border: 0;
}

a {
  color: #1a73e8;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #1558b0;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: #333333;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

/* ============================================================
   Layout — 全站统一外壳
   ============================================================ */

/* 页头 */
.site-header {
  background-color: #ffffff;
  border-bottom: 1px solid #e0e0e0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: #333333;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.brand:hover .brand-name {
  color: #1a73e8;
}

/* 主导航 */
.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: #555555;
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-list li a:hover {
  color: #1a73e8;
  background-color: #f0f4fb;
}

.nav-list li a.is-current {
  color: #1a73e8;
  background-color: #e8f0fe;
  font-weight: 600;
}

/* 汉堡按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: 1px solid #e0e0e0;
  border-radius: 4px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: #333333;
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* 页脚 */
.site-footer {
  background-color: #ffffff;
  border-top: 1px solid #e0e0e0;
  margin-top: auto;
  flex-shrink: 0;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.footer-brand .footer-logo {
  font-size: 18px;
  font-weight: 700;
  color: #333333;
}

.footer-tagline {
  margin-top: 8px;
  font-size: 14px;
  color: #777777;
  line-height: 1.6;
}

.footer-links h3 {
  font-size: 15px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 12px;
}

.footer-links ul {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 16px;
}

.footer-links ul li a {
  font-size: 14px;
  color: #666666;
}

.footer-links ul li a:hover {
  color: #1a73e8;
}

.footer-info {
  grid-column: 1 / -1;
  border-top: 1px solid #eeeeee;
  padding-top: 16px;
  font-size: 13px;
  color: #999999;
  line-height: 1.6;
}

.copyright {
  margin-top: 4px;
}

/* 内页统一外壳 */
.inner-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 48px;
  width: 100%;
  flex: 1 0 auto;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: #888888;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: #666666;
}

.breadcrumb a:hover {
  color: #1a73e8;
}

.breadcrumb-sep {
  color: #bbbbbb;
  font-size: 12px;
}

.breadcrumb-current {
  color: #333333;
  font-weight: 500;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid #e0e0e0;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: #333333;
  margin-bottom: 8px;
}

.page-description {
  font-size: 15px;
  color: #666666;
  max-width: 720px;
  line-height: 1.7;
}

/* ============================================================
   Components — 通用组件
   ============================================================ */

/* 区块标题 */
.section-title {
  font-size: 22px;
  font-weight: 700;
  color: #333333;
  margin-bottom: 8px;
}

.section-intro,
.section-desc,
.section-description {
  font-size: 14px;
  color: #777777;
  margin-bottom: 24px;
  max-width: 720px;
  line-height: 1.7;
}

/* 按钮 */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
  background-color: #1a73e8;
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #1558b0;
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(26, 115, 232, 0.25);
}

.btn-secondary {
  background-color: #ffffff;
  color: #333333;
  border: 1px solid #e0e0e0;
}

.btn-secondary:hover {
  border-color: #1a73e8;
  color: #1a73e8;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

/* 相关链接（首页底部） */
.related-links {
  max-width: 1200px;
  margin: 0 auto;
  padding: 8px 20px 32px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.related-links-label {
  font-size: 13px;
  color: #999999;
  flex-shrink: 0;
}

.related-links-item {
  font-size: 13px;
  color: #666666;
  padding: 4px 0;
}

.related-links-item:hover {
  color: #1a73e8;
}

/* 内页相关推荐区块 */
.related-links .related-title {
  font-size: 18px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 12px;
}

.related-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.related-links ul li a {
  font-size: 14px;
  color: #666666;
  padding: 4px 0;
}

.related-links ul li a:hover {
  color: #1a73e8;
}

/* ============================================================
   Pages — 首页
   ============================================================ */

.home-main {
  width: 100%;
}

/* Hero 区 */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px 48px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero-content h1 {
  font-size: 32px;
  font-weight: 700;
  color: #333333;
  line-height: 1.3;
  margin-bottom: 12px;
}

.hero-slogan {
  font-size: 18px;
  font-weight: 600;
  color: #1a73e8;
  margin-bottom: 10px;
}

.hero-desc {
  font-size: 15px;
  color: #666666;
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-figure {
  border-radius: 8px;
  overflow: hidden;
  background-color: #e0e0e0;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.hero-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

/* 频道索引（首页标签带） */
.channel-index {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px;
}

.channel-index h2 {
  font-size: 22px;
  font-weight: 700;
  color: #333333;
  margin-bottom: 8px;
}

.channel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.channel-tags li a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 20px;
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  color: #555555;
  transition: border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.channel-tags li a:hover {
  border-color: #1a73e8;
  color: #1a73e8;
  box-shadow: 0 2px 8px rgba(26, 115, 232, 0.1);
}

/* 最新更新 */
.latest-updates {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px;
}

.latest-updates h2 {
  font-size: 22px;
  font-weight: 700;
  color: #333333;
  margin-bottom: 8px;
}

.update-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.update-card {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

.update-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.update-card a {
  display: block;
  height: 100%;
  color: #333333;
}

.update-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  background-color: #f0f0f0;
}

.card-body {
  padding: 16px;
}

.card-body h3 {
  font-size: 15px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 8px;
  line-height: 1.4;
}

.card-body h3:hover {
  color: #1a73e8;
}

.card-meta {
  font-size: 13px;
  color: #999999;
  margin-bottom: 8px;
}

.badge {
  display: inline-block;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 500;
  color: #1a73e8;
  background-color: #e8f0fe;
  border-radius: 12px;
}

/* 专题推荐（首页） */
.topic-recommendations {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px;
}

.topic-recommendations h2 {
  font-size: 22px;
  font-weight: 700;
  color: #333333;
  margin-bottom: 8px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.topic-card {
  display: block;
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

.topic-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.topic-card-inner {
  padding: 24px;
}

.topic-card-inner h3 {
  font-size: 18px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 10px;
}

.topic-card-inner h3:hover {
  color: #1a73e8;
}

.topic-card-inner p {
  font-size: 14px;
  color: #666666;
  line-height: 1.7;
  margin-bottom: 16px;
}

.topic-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  color: #1a73e8;
  min-height: 32px;
}

.topic-link:hover {
  color: #1558b0;
}

/* 观看指南入口（首页） */
.guide-entry {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px;
}

.guide-entry h2 {
  font-size: 22px;
  font-weight: 700;
  color: #333333;
  margin-bottom: 8px;
}

.guide-entry-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.guide-card {
  display: block;
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  transition: box-shadow 0.2s ease;
}

.guide-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.guide-card-inner {
  padding: 24px;
}

.guide-card-inner h3 {
  font-size: 17px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 8px;
}

.guide-card-inner h3:hover {
  color: #1a73e8;
}

.guide-card-inner p {
  font-size: 14px;
  color: #666666;
  line-height: 1.7;
  margin-bottom: 12px;
}

.guide-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  color: #1a73e8;
  min-height: 32px;
}

.guide-link:hover {
  color: #1558b0;
}

/* ============================================================
   Pages — 频道分类页
   ============================================================ */

.channel-index-section,
.channel-scope-section {
  margin-bottom: 40px;
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.channel-card {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}

.channel-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.channel-media {
  overflow: hidden;
  background-color: #f0f0f0;
}

.channel-media img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.channel-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.channel-name {
  font-size: 16px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 8px;
}

.channel-desc {
  font-size: 13px;
  color: #777777;
  line-height: 1.6;
  margin-bottom: 12px;
  flex: 1;
}

.channel-link {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  font-weight: 500;
  color: #1a73e8;
  min-height: 32px;
}

.channel-link:hover {
  color: #1558b0;
}

/* 收录范围列表 */
.scope-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.scope-item {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 20px;
}

.scope-title {
  font-size: 15px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 8px;
}

.scope-item p {
  font-size: 14px;
  color: #666666;
  line-height: 1.7;
}

/* ============================================================
   Pages — 内容专题页
   ============================================================ */

.topic-section,
.topic-preview-section {
  margin-bottom: 40px;
}

.topic-section .topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.topic-card {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s ease;
}

.topic-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.topic-cover {
  overflow: hidden;
  background-color: #f0f0f0;
}

.topic-cover img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.topic-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.topic-name {
  font-size: 16px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 8px;
}

.topic-desc {
  font-size: 13px;
  color: #777777;
  line-height: 1.6;
  margin-bottom: 10px;
  flex: 1;
}

.topic-reason {
  font-size: 13px;
  color: #555555;
  line-height: 1.6;
  margin-bottom: 12px;
}

.topic-reason strong {
  color: #1a73e8;
  font-weight: 600;
}

.topic-link {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  font-weight: 500;
  color: #1a73e8;
  min-height: 32px;
}

.topic-link:hover {
  color: #1558b0;
}

/* 专题预览 */
.preview-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.preview-item {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  transition: box-shadow 0.2s ease;
}

.preview-item:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.preview-media {
  flex-shrink: 0;
  width: 200px;
  overflow: hidden;
  background-color: #f0f0f0;
}

.preview-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.preview-content {
  padding: 16px;
  display: flex;
  flex-direction: column;
}

.preview-name {
  font-size: 15px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 8px;
}

.preview-desc {
  font-size: 13px;
  color: #777777;
  line-height: 1.6;
  margin-bottom: 10px;
  flex: 1;
}

.preview-note {
  font-size: 13px;
  color: #1a73e8;
  font-weight: 500;
}

/* 相关推荐 */
.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.related-list li a {
  font-size: 14px;
  color: #666666;
  padding: 4px 0;
}

.related-list li a:hover {
  color: #1a73e8;
}

/* ============================================================
   Pages — 观看指南页
   ============================================================ */

.layout-shell {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
}

.layout-shell.sidebar-left {
  grid-template-columns: 280px 1fr;
}

/* 指南目录（侧栏） */
.guide-toc {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 20px;
  position: sticky;
  top: 84px;
}

.guide-toc h2 {
  font-size: 16px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 12px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toc-list li a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: #555555;
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.toc-list li a:hover {
  color: #1a73e8;
  background-color: #f0f4fb;
}

/* 指南内容 */
.guide-content {
  min-width: 0;
}

.guide-section {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
}

.guide-section h2 {
  font-size: 20px;
  font-weight: 700;
  color: #333333;
  margin-bottom: 12px;
}

.guide-section > p {
  font-size: 14px;
  color: #666666;
  line-height: 1.7;
  margin-bottom: 16px;
}

.guide-figure {
  border-radius: 8px;
  overflow: hidden;
  background-color: #f0f0f0;
  margin-bottom: 20px;
}

.guide-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: #888888;
  background-color: #fafafa;
  border-top: 1px solid #eeeeee;
}

.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 20px;
}

.guide-steps li {
  padding-left: 20px;
  position: relative;
}

.guide-steps li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #1a73e8;
}

.guide-steps li h3 {
  font-size: 15px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 4px;
}

.guide-steps li p {
  font-size: 14px;
  color: #666666;
  line-height: 1.7;
}

.guide-section > p a {
  font-weight: 500;
}

/* 指南页 FAQ 预览 */
.guide-qa-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 16px;
}

.qa-item {
  padding: 16px;
  background-color: #fafafa;
  border-radius: 6px;
  border: 1px solid #eeeeee;
}

.qa-item h3 {
  font-size: 14px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 6px;
}

.qa-item p {
  font-size: 14px;
  color: #666666;
  line-height: 1.7;
}

/* 指南页相关链接 */
.guide-related {
  margin-top: 24px;
}

.guide-related h2 {
  font-size: 18px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 12px;
}

.guide-related .related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 0;
}

.guide-related .related-links li a {
  font-size: 14px;
  color: #666666;
  padding: 4px 0;
}

.guide-related .related-links li a:hover {
  color: #1a73e8;
}

/* ============================================================
   Pages — 常见问题页
   ============================================================ */

.faq-categories,
.faq-list,
.faq-related {
  margin-bottom: 40px;
}

.content-media-inline {
  border-radius: 8px;
  overflow: hidden;
  background-color: #f0f0f0;
  margin-bottom: 16px;
  max-width: 720px;
}

.content-media-inline img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.content-media-inline figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: #888888;
  background-color: #fafafa;
  border-top: 1px solid #eeeeee;
}

.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.category-tag {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 20px;
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  color: #555555;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.category-tag:hover {
  border-color: #1a73e8;
  color: #1a73e8;
}

/* FAQ 分组 */
.faq-group-title {
  font-size: 17px;
  font-weight: 600;
  color: #333333;
  margin: 24px 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid #e8f0fe;
}

.faq-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.faq-item {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  overflow: hidden;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: #333333;
  cursor: pointer;
  min-height: 48px;
  list-style: none;
  transition: background-color 0.2s ease;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: #999999;
  flex-shrink: 0;
  margin-left: 12px;
  transition: transform 0.2s ease;
}

.faq-item[open] summary {
  background-color: #f8fafc;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item summary:hover {
  background-color: #f8fafc;
}

.faq-answer {
  padding: 0 20px 16px;
  border-top: 1px solid #f0f0f0;
}

.faq-answer p {
  padding-top: 12px;
  font-size: 14px;
  color: #666666;
  line-height: 1.7;
}

.faq-answer p a {
  font-weight: 500;
}

/* FAQ 相关链接 */
.faq-related .related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 0;
}

.faq-related .related-links .related-link {
  font-size: 14px;
  color: #666666;
  padding: 4px 0;
}

.faq-related .related-links .related-link:hover {
  color: #1a73e8;
}

/* ============================================================
   Pages — 长尾文章页
   ============================================================ */

.layout-shell .article-content {
  min-width: 0;
}

.content-section {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
}

.content-section .section-title {
  font-size: 20px;
  font-weight: 700;
  color: #333333;
  margin-bottom: 12px;
}

.content-section p {
  font-size: 14px;
  color: #666666;
  line-height: 1.7;
  margin-bottom: 12px;
}

.content-section p a {
  font-weight: 500;
}

.content-figure {
  border-radius: 8px;
  overflow: hidden;
  background-color: #f0f0f0;
  margin: 16px 0;
}

.content-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.content-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: #888888;
  background-color: #fafafa;
  border-top: 1px solid #eeeeee;
}

/* 侧栏（相关推荐） */
.sidebar-area {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 20px;
  position: sticky;
  top: 84px;
}

.sidebar-title {
  font-size: 16px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 12px;
}

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-list li a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: #555555;
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.sidebar-list li a:hover {
  color: #1a73e8;
  background-color: #f0f4fb;
}

/* ============================================================
   Pages — 404 页
   ============================================================ */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  min-height: 60vh;
}

.error-panel {
  text-align: center;
  max-width: 480px;
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 48px 32px;
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  color: #1a73e8;
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 22px;
  font-weight: 600;
  color: #333333;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 14px;
  color: #777777;
  line-height: 1.7;
  margin-bottom: 24px;
}

.error-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  background-color: #1a73e8;
  color: #ffffff;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  transition: background-color 0.2s ease;
}

.error-btn:hover {
  background-color: #1558b0;
  color: #ffffff;
}

/* ============================================================
   Responsive — 响应式
   ============================================================ */

/* 平板及以下 */
@media (max-width: 992px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-figure img {
    height: 260px;
  }

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

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

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

  .preview-item {
    flex-direction: column;
  }

  .preview-media {
    width: 100%;
  }

  .preview-media img {
    height: 160px;
  }
}

/* 手机端 */
@media (max-width: 768px) {
  .header-inner {
    height: 56px;
    padding: 0 16px;
  }

  .brand-name {
    font-size: 17px;
  }

  /* 汉堡菜单 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: #ffffff;
    border-bottom: 1px solid #e0e0e0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 2px;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-list li a {
    padding: 12px 16px;
    font-size: 15px;
    border-radius: 4px;
  }

  .nav-list li a.is-current {
    background-color: #e8f0fe;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 20px;
  }

  .footer-info {
    grid-column: 1;
  }

  /* 内页 */
  .inner-main {
    padding: 16px 16px 40px;
  }

  .page-header {
    margin-bottom: 24px;
    padding-bottom: 16px;
  }

  .page-title {
    font-size: 22px;
  }

  .page-description {
    font-size: 14px;
  }

  .breadcrumb {
    margin-bottom: 16px;
    font-size: 13px;
  }

  /* 首页 */
  .hero {
    padding: 24px 16px 32px;
  }

  .hero-content h1 {
    font-size: 24px;
  }

  .hero-slogan {
    font-size: 16px;
  }

  .hero-desc {
    font-size: 14px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    width: 100%;
  }

  .hero-figure img {
    height: 200px;
  }

  .channel-index,
  .latest-updates,
  .topic-recommendations,
  .guide-entry {
    padding: 24px 16px;
  }

  .channel-index h2,
  .latest-updates h2,
  .topic-recommendations h2,
  .guide-entry h2 {
    font-size: 19px;
  }

  .channel-tags {
    gap: 8px;
  }

  .channel-tags li a {
    padding: 8px 14px;
    font-size: 13px;
    min-height: 36px;
  }

  .update-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .update-card img {
    height: 180px;
  }

  .topic-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .topic-card-inner {
    padding: 20px;
  }

  .guide-entry-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .guide-card-inner {
    padding: 20px;
  }

  .related-links {
    padding: 8px 16px 24px;
  }

  /* 频道页 */
  .channel-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .channel-media img {
    height: 120px;
  }

  .scope-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 专题页 */
  .topic-section .topic-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .topic-cover img {
    height: 180px;
  }

  .preview-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 指南页 */
  .layout-shell,
  .layout-shell.sidebar-left {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .guide-toc {
    display: none;
  }

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

  .guide-section h2 {
    font-size: 18px;
  }

  .guide-figure img {
    height: 160px;
  }

  /* FAQ 页 */
  .faq-item summary {
    padding: 14px 16px;
    font-size: 14px;
  }

  .faq-answer {
    padding: 0 16px 14px;
  }

  .category-tags {
    gap: 8px;
  }

  .category-tag {
    padding: 8px 14px;
    font-size: 13px;
    min-height: 36px;
  }

  .content-media-inline img {
    height: 160px;
  }

  /* 长尾文章页 */
  .content-section {
    padding: 20px 16px;
  }

  .content-section .section-title {
    font-size: 18px;
  }

  .content-figure img {
    height: 180px;
  }

  .sidebar-area {
    margin-top: 24px;
    position: static;
  }

  /* 404 */
  .error-main {
    padding: 40px 16px;
  }

  .error-panel {
    padding: 36px 20px;
  }

  .error-code {
    font-size: 48px;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .channel-grid {
    grid-template-columns: 1fr;
  }

  .channel-media img {
    height: 160px;
  }

  .footer-links ul {
    grid-template-columns: 1fr;
  }
}