/* ============================================================
   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%;
  scroll-behavior: smooth;
}

body {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 1rem;
  line-height: 1.7;
  color: #333333;
  background: #ffffff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: #333333;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #000000;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-family: Arial, sans-serif;
  font-weight: 700;
  color: #000000;
  line-height: 1.3;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.125rem;
}

p {
  margin-bottom: 1rem;
}

button {
  font-family: Arial, sans-serif;
  cursor: pointer;
  border: none;
  background: none;
}

/* ============================================================
   LAYOUT — 全站布局骨架
   ============================================================ */

/* --- 站点主体 --- */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

/* --- 统一容器宽度 --- */
.header-inner,
.inner-main,
.footer-inner,
.home-main {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.home-main {
  padding-top: 0;
}

/* --- 页头 --- */
.site-header {
  background: #ffffff;
  border-bottom: 2px solid #000000;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  flex-shrink: 0;
}

.brand-name {
  font-family: Arial, sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: #000000;
  letter-spacing: 0;
}

.brand-slogan {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 0.8125rem;
  color: #666666;
  margin-top: 2px;
}

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

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

.nav-list a {
  display: block;
  padding: 8px 16px;
  font-family: Arial, sans-serif;
  font-size: 0.9375rem;
  font-weight: 400;
  color: #333333;
  border-bottom: 2px solid transparent;
}

.nav-list a:hover {
  color: #000000;
  border-bottom-color: #000000;
}

.nav-list a.is-current {
  color: #000000;
  font-weight: 700;
  border-bottom-color: #000000;
}

/* --- 导航切换按钮（移动端） --- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  padding: 8px;
}

.nav-toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background: #000000;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* --- 页脚 --- */
.site-footer {
  background: #f5f5f5;
  border-top: 1px solid #dddddd;
  margin-top: auto;
}

.footer-inner {
  padding-top: 48px;
  padding-bottom: 24px;
}

.footer-brand {
  margin-bottom: 32px;
}

.footer-brand-name {
  font-family: Arial, sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: #000000;
  margin-bottom: 4px;
}

.footer-tagline {
  font-size: 0.875rem;
  color: #666666;
  margin-bottom: 0;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding: 32px 0;
  border-top: 1px solid #dddddd;
  border-bottom: 1px solid #dddddd;
}

.footer-col h3 {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.footer-col ul li {
  margin-bottom: 6px;
}

.footer-col ul a {
  font-size: 0.875rem;
  color: #666666;
}

.footer-col ul a:hover {
  color: #000000;
}

.footer-copyright {
  padding-top: 24px;
  text-align: center;
}

.footer-copyright p {
  font-size: 0.8125rem;
  color: #666666;
  margin-bottom: 0;
}

/* --- 面包屑 --- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0;
  font-size: 0.875rem;
  color: #666666;
}

.breadcrumb a {
  color: #666666;
}

.breadcrumb a:hover {
  color: #000000;
}

.breadcrumb-sep {
  color: #999999;
}

.breadcrumb-current {
  color: #333333;
  font-weight: 700;
}

/* --- 内页标题区 --- */
.inner-main {
  padding-top: 0;
  padding-bottom: 64px;
}

.page-header {
  padding: 32px 0 24px;
  border-bottom: 2px solid #000000;
  margin-bottom: 32px;
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.page-description {
  font-size: 1rem;
  color: #666666;
  max-width: 760px;
  margin-bottom: 0;
}

/* --- 区块标题 --- */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid #dddddd;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 48px;
  height: 2px;
  background: #000000;
}

.section-desc {
  font-size: 0.9375rem;
  color: #666666;
  margin-bottom: 24px;
  max-width: 760px;
}

.section-lead {
  font-size: 1rem;
  color: #333333;
  margin-bottom: 24px;
  max-width: 760px;
}

/* --- 内页通用相关推荐 --- */
.related-links {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid #dddddd;
}

.related-links h2,
.related-links .block-title {
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.related-list li {
  margin-bottom: 8px;
  padding-left: 16px;
  position: relative;
}

.related-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: #666666;
}

.related-list a {
  font-size: 0.9375rem;
  color: #333333;
}

.related-list a:hover {
  color: #000000;
  text-decoration: underline;
}

/* ============================================================
   COMPONENTS — 通用组件
   ============================================================ */

/* --- 文章卡片 --- */
.update-card {
  padding: 16px 0;
  border-bottom: 1px solid #eeeeee;
}

.update-card h3 {
  font-size: 1.0625rem;
  margin-bottom: 6px;
}

.update-card h3 a {
  color: #333333;
}

.update-card h3 a:hover {
  color: #000000;
  text-decoration: underline;
}

.update-summary {
  font-size: 0.875rem;
  color: #666666;
  margin-bottom: 6px;
  line-height: 1.6;
}

/* --- 频道标签 --- */
.channel-tag {
  display: inline-block;
  padding: 6px 16px;
  font-family: Arial, sans-serif;
  font-size: 0.875rem;
  font-weight: 400;
  color: #333333;
  background: #ffffff;
  border: 1px solid #dddddd;
  border-radius: 4px;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.channel-tag:hover {
  background: #000000;
  color: #ffffff;
  border-color: #000000;
}

/* --- 专题卡片 --- */
.topic-card {
  background: #ffffff;
  border: 1px solid #dddddd;
  border-radius: 6px;
  overflow: hidden;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.topic-card:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

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

.topic-card h3 {
  font-size: 1.0625rem;
  padding: 16px 16px 4px;
}

.topic-card h3 a {
  color: #333333;
}

.topic-card h3 a:hover {
  color: #000000;
}

.topic-card p {
  font-size: 0.875rem;
  color: #666666;
  padding: 0 16px 16px;
  margin-bottom: 0;
  line-height: 1.6;
}

/* --- 编辑推荐条目 --- */
.pick-card {
  display: flex;
  gap: 16px;
  padding: 16px;
  background: #ffffff;
  border: 1px solid #eeeeee;
  border-radius: 6px;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.pick-card:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.pick-card h3 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.pick-card h3 a {
  color: #333333;
}

.pick-card h3 a:hover {
  color: #000000;
  text-decoration: underline;
}

.pick-reason {
  font-size: 0.875rem;
  color: #666666;
  margin-bottom: 0;
  line-height: 1.6;
}

/* --- 图片容器 --- */
figure {
  margin: 0;
}

.content-figure,
.content-media {
  margin: 24px 0;
}

.content-figure img,
.content-media img {
  width: 100%;
  height: auto;
  max-height: 480px;
  object-fit: cover;
  border: 1px solid #eeeeee;
  border-radius: 4px;
}

.content-figure figcaption,
.content-media figcaption {
  font-size: 0.8125rem;
  color: #666666;
  padding: 8px 4px 0;
  text-align: center;
  font-style: italic;
}

/* --- 更多链接 --- */
.more-link {
  display: inline-block;
  margin-top: 16px;
  font-family: Arial, sans-serif;
  font-size: 0.875rem;
  font-weight: 700;
  color: #000000;
  border-bottom: 1px solid #000000;
  padding-bottom: 2px;
}

.more-link:hover {
  color: #666666;
  border-bottom-color: #666666;
}

/* ============================================================
   PAGES — 首页
   ============================================================ */

/* --- Hero 区 --- */
.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 48px 0;
  border-bottom: 2px solid #000000;
}

.hero-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border: 1px solid #eeeeee;
  border-radius: 4px;
}

.hero-content h1 {
  font-size: 2.25rem;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-description {
  font-size: 1rem;
  color: #666666;
  line-height: 1.7;
  margin-bottom: 24px;
}

.hero-cta {
  display: inline-block;
  padding: 12px 28px;
  font-family: Arial, sans-serif;
  font-size: 0.9375rem;
  font-weight: 700;
  color: #ffffff;
  background: #000000;
  border-radius: 4px;
  transition: background 0.2s ease;
}

.hero-cta:hover {
  background: #333333;
  color: #ffffff;
}

/* --- 频道分类导航带 --- */
.channel-strip {
  padding: 32px 0;
  border-bottom: 1px solid #eeeeee;
}

.channel-strip .section-title {
  margin-bottom: 16px;
}

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

/* --- 首页两栏布局 --- */
.home-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 48px;
  padding: 48px 0;
}

/* --- 最新更新 --- */
.latest-updates {
  margin-bottom: 48px;
}

.update-list li {
  margin-bottom: 0;
}

.update-list li:last-child .update-card {
  border-bottom: none;
}

.update-card .update-date {
  font-size: 0.8125rem;
  color: #999999;
  font-family: Arial, sans-serif;
}

/* --- 编辑推荐 --- */
.pick-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* --- 首页侧栏 --- */
.home-side-col {
  border-left: 1px solid #eeeeee;
  padding-left: 32px;
}

.topic-recommend {
  margin-bottom: 32px;
}

.topic-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.side-note {
  padding: 16px;
  background: #f5f5f5;
  border-left: 3px solid #000000;
  border-radius: 0 4px 4px 0;
}

.side-note-text {
  font-size: 0.875rem;
  color: #666666;
  margin-bottom: 0;
  line-height: 1.6;
}

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

.channel-grid-section {
  margin-bottom: 48px;
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.channel-card {
  background: #ffffff;
  border: 1px solid #dddddd;
  border-radius: 6px;
  overflow: hidden;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.channel-card:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.channel-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.channel-content {
  padding: 16px;
}

.channel-content h3 {
  font-size: 1.0625rem;
  margin-bottom: 6px;
}

.channel-content p {
  font-size: 0.875rem;
  color: #666666;
  margin-bottom: 12px;
  line-height: 1.6;
}

.channel-link {
  font-family: Arial, sans-serif;
  font-size: 0.875rem;
  font-weight: 700;
  color: #000000;
  border-bottom: 1px solid #000000;
  padding-bottom: 1px;
}

.channel-link:hover {
  color: #666666;
  border-bottom-color: #666666;
}

.channel-notes-section {
  margin-bottom: 48px;
}

.notes-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.note-item {
  padding: 20px;
  background: #f5f5f5;
  border-left: 3px solid #000000;
  border-radius: 0 4px 4px 0;
}

.note-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.note-item p {
  font-size: 0.875rem;
  color: #666666;
  margin-bottom: 0;
  line-height: 1.6;
}

.channel-tip {
  margin-top: 24px;
  padding: 16px 20px;
  background: #ffffff;
  border: 1px solid #dddddd;
  border-radius: 4px;
  font-size: 0.875rem;
  color: #666666;
  line-height: 1.6;
}

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

.topics-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 48px;
}

.topic-list-section {
  margin-bottom: 32px;
}

.topic-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid #eeeeee;
}

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

.topic-item-media img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid #eeeeee;
}

.topic-item-content h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.topic-item-content h3 a {
  color: #333333;
}

.topic-item-content h3 a:hover {
  color: #000000;
  text-decoration: underline;
}

.topic-item-summary {
  font-size: 0.9375rem;
  color: #666666;
  margin-bottom: 8px;
  line-height: 1.6;
}

.topic-item-meta {
  font-size: 0.8125rem;
  color: #999999;
  font-family: Arial, sans-serif;
  margin-bottom: 0;
}

.topics-aside {
  border-left: 1px solid #eeeeee;
  padding-left: 32px;
}

.topic-detail-section {
  position: sticky;
  top: 96px;
}

.topic-detail-card {
  padding: 24px;
  background: #f5f5f5;
  border-radius: 6px;
  border: 1px solid #eeeeee;
}

.topic-detail-card h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #dddddd;
}

.topic-detail-card p {
  font-size: 0.875rem;
  color: #666666;
  line-height: 1.7;
}

.topic-detail-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}

.topic-detail-links a {
  font-family: Arial, sans-serif;
  font-size: 0.875rem;
  font-weight: 700;
  color: #000000;
  border-bottom: 1px solid #000000;
  padding-bottom: 1px;
  align-self: flex-start;
}

.topic-detail-links a:hover {
  color: #666666;
  border-bottom-color: #666666;
}

.related-guide {
  margin-top: 32px;
  padding: 20px;
  background: #ffffff;
  border: 1px solid #dddddd;
  border-radius: 6px;
}

.related-guide h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.related-guide p {
  font-size: 0.875rem;
  color: #666666;
  margin-bottom: 0;
  line-height: 1.6;
}

.related-guide a {
  color: #000000;
  font-weight: 700;
  border-bottom: 1px solid #000000;
  padding-bottom: 1px;
}

.related-guide a:hover {
  color: #666666;
  border-bottom-color: #666666;
}

/* ============================================================
   PAGES — 实用指南页
   ============================================================ */

.page-content {
  max-width: 860px;
}

.content-section {
  margin-bottom: 48px;
}

.content-section h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid #dddddd;
}

.content-media-inline {
  margin: 24px 0;
}

.content-media-inline img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.method-steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 24px;
}

.method-step {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: #ffffff;
  border: 1px solid #eeeeee;
  border-radius: 6px;
}

.step-number {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-family: Arial, sans-serif;
  font-size: 1.125rem;
  font-weight: 700;
  color: #ffffff;
  background: #000000;
  border-radius: 50%;
}

.step-body h3 {
  font-size: 1.0625rem;
  margin-bottom: 6px;
}

.step-body p {
  font-size: 0.9375rem;
  color: #666666;
  margin-bottom: 0;
  line-height: 1.7;
}

.tip-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.tip-item {
  padding: 20px;
  background: #f5f5f5;
  border-left: 3px solid #000000;
  border-radius: 0 4px 4px 0;
}

.tip-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.tip-item p {
  font-size: 0.875rem;
  color: #666666;
  margin-bottom: 0;
  line-height: 1.6;
}

.tracking-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.tracking-card {
  padding: 20px;
  background: #ffffff;
  border: 1px solid #dddddd;
  border-radius: 6px;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.tracking-card:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.tracking-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.tracking-card p {
  font-size: 0.875rem;
  color: #666666;
  margin-bottom: 0;
  line-height: 1.6;
}

/* ============================================================
   PAGES — 深度解读页
   ============================================================ */

.article-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px;
}

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

.content-block {
  margin-bottom: 40px;
}

.block-title {
  font-size: 1.5rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid #dddddd;
}

.content-block p {
  font-size: 1rem;
  color: #333333;
  line-height: 1.8;
  margin-bottom: 16px;
}

.content-figure {
  margin: 24px 0;
}

.article-sidebar {
  border-left: 1px solid #eeeeee;
  padding-left: 32px;
}

.sidebar-card {
  margin-bottom: 24px;
  padding: 20px;
  background: #f5f5f5;
  border-radius: 6px;
}

.sidebar-card h2 {
  font-size: 1rem;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #dddddd;
}

.sidebar-list li {
  margin-bottom: 8px;
  padding-left: 16px;
  position: relative;
}

.sidebar-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: #666666;
}

.sidebar-list a {
  font-size: 0.875rem;
  color: #333333;
}

.sidebar-list a:hover {
  color: #000000;
  text-decoration: underline;
}

/* ============================================================
   PAGES — 404 页
   ============================================================ */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
}

.error-content {
  text-align: center;
  max-width: 520px;
}

.error-code {
  font-family: Arial, sans-serif;
  font-size: 6rem;
  font-weight: 700;
  color: #000000;
  line-height: 1;
  margin-bottom: 24px;
}

.error-content h1 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 1rem;
  color: #666666;
  margin-bottom: 32px;
}

.btn-home {
  display: inline-block;
  padding: 12px 32px;
  font-family: Arial, sans-serif;
  font-size: 0.9375rem;
  font-weight: 700;
  color: #ffffff;
  background: #000000;
  border-radius: 4px;
  transition: background 0.2s ease;
}

.btn-home:hover {
  background: #333333;
  color: #ffffff;
}

/* ============================================================
   RESPONSIVE — 响应式
   ============================================================ */

/* --- 平板 --- */
@media (max-width: 1024px) {
  .hero-section {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .home-layout {
    grid-template-columns: 1fr 300px;
    gap: 32px;
  }

  .topics-layout {
    grid-template-columns: 1fr 320px;
    gap: 32px;
  }

  .article-layout {
    grid-template-columns: 1fr 280px;
    gap: 32px;
  }

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

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

/* --- 手机端 --- */
@media (max-width: 768px) {
  .header-inner {
    min-height: 60px;
    flex-wrap: wrap;
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .brand-logo {
    order: 1;
  }

  .brand-name {
    font-size: 1.25rem;
  }

  .brand-slogan {
    font-size: 0.75rem;
  }

  .nav-toggle {
    display: flex;
    order: 2;
    margin-left: auto;
  }

  .site-nav {
    order: 3;
    width: 100%;
    flex-basis: 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    width: 100%;
    padding: 8px 0;
    border-top: 1px solid #eeeeee;
  }

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

  .nav-list a {
    padding: 12px 8px;
    font-size: 1rem;
    border-bottom: 1px solid #eeeeee;
  }

  .nav-list a.is-current {
    border-bottom-color: #eeeeee;
    background: #f5f5f5;
  }

  .home-main,
  .inner-main,
  .footer-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-section {
    padding: 32px 0;
  }

  .hero-content h1 {
    font-size: 1.75rem;
  }

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

  .home-layout {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px 0;
  }

  .home-side-col {
    border-left: none;
    border-top: 1px solid #eeeeee;
    padding-left: 0;
    padding-top: 32px;
  }

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

  .pick-card {
    flex-direction: column;
    gap: 8px;
  }

  .page-header {
    padding: 24px 0 16px;
    margin-bottom: 24px;
  }

  .page-title {
    font-size: 1.625rem;
  }

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

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

  .topics-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .topic-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .topic-item-media img {
    height: 180px;
  }

  .topics-aside {
    border-left: none;
    border-top: 1px solid #eeeeee;
    padding-left: 0;
    padding-top: 32px;
    margin-top: 32px;
  }

  .topic-detail-section {
    position: static;
  }

  .article-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .article-sidebar {
    border-left: none;
    border-top: 1px solid #eeeeee;
    padding-left: 0;
    padding-top: 32px;
    margin-top: 32px;
  }

  .method-step {
    flex-direction: column;
    gap: 12px;
  }

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

  .footer-links {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 24px 0;
  }

  .footer-copyright {
    text-align: left;
  }

  .error-code {
    font-size: 4rem;
  }
}

/* --- 小屏手机 --- */
@media (max-width: 480px) {
  .channel-tags {
    gap: 8px;
  }

  .channel-tag {
    padding: 6px 12px;
    font-size: 0.8125rem;
  }

  .topic-cards {
    grid-template-columns: 1fr;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .footer-col h3 {
    margin-bottom: 8px;
  }

  .hero-cta {
    width: 100%;
    text-align: center;
  }

  .content-media-inline img {
    height: 200px;
  }

  .content-figure img {
    height: 220px;
  }
}