/* ============================================================
   base - 基础变量与重置
   ============================================================ */
:root {
  --color-primary: #1a3a5c;
  --color-accent: #e67e22;
  --color-bg: #f8f9fa;
  --color-text: #333333;
  --color-white: #ffffff;
  --color-border: #e5e8eb;
  --color-muted: #6b7a8a;
  --container-width: 1200px;
  --header-height: 72px;
  --radius: 8px;
  --font-family: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent);
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 20px;
}

p {
  margin-bottom: 1em;
}

time {
  color: var(--color-muted);
  font-size: 14px;
}

/* ============================================================
   layout - 全站骨架布局
   ============================================================ */

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

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

/* 页头 */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  z-index: 2;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0;
  line-height: 1.2;
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.2;
}

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

.nav-list {
  display: flex;
  gap: 32px;
}

.nav-list a {
  display: inline-block;
  padding: 8px 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nav-list a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.nav-list a.is-current {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  font-weight: 700;
}

/* 汉堡按钮（默认隐藏） */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.nav-toggle-icon {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-primary);
  position: relative;
  transition: background-color 0.3s;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background-color: var(--color-primary);
  transition: transform 0.3s;
}

.nav-toggle-icon::before {
  top: -7px;
}

.nav-toggle-icon::after {
  top: 7px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: rotate(-45deg);
  top: 0;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 40px;
}

.footer-brand .footer-site-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 4px;
}

.footer-brand .footer-slogan {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 12px;
}

.footer-brand .footer-desc {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.65);
}

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

.footer-col h3 {
  font-size: 16px;
  color: var(--color-white);
  margin-bottom: 12px;
  font-weight: 600;
}

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

.footer-col ul a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
}

.footer-col ul a:hover {
  color: var(--color-accent);
}

.footer-legal {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 20px;
  margin-top: 8px;
}

.footer-legal p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 4px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 24px;
  padding: 16px 0 0;
}

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

.breadcrumb a:hover {
  color: var(--color-accent);
}

.breadcrumb-sep {
  color: var(--color-muted);
}

.breadcrumb-current {
  color: var(--color-muted);
}

/* 内页容器 */
.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 48px;
  flex: 1 0 auto;
  width: 100%;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.page-description {
  font-size: 16px;
  color: var(--color-muted);
  line-height: 1.6;
  max-width: 720px;
}

/* 通用区块标题 */
.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 24px;
  position: relative;
  padding-left: 14px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

/* 按钮 */
.btn {
  display: inline-block;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s;
  border: 2px solid transparent;
  text-align: center;
  min-height: 44px;
  line-height: 1.4;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: #14304f;
  color: var(--color-white);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* ============================================================
   components - 通用组件
   ============================================================ */

/* 首页 Hero */
.hero-section {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: center;
  padding: 40px 0;
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.hero-media {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(26, 58, 92, 0.12);
}

.hero-media img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 4px;
  background-color: var(--color-accent);
  color: var(--color-white);
  align-self: flex-start;
}

.tag-hot {
  background-color: #d9534f;
}

.hero-content h1 {
  font-size: 32px;
  line-height: 1.3;
  color: var(--color-primary);
}

.hero-summary {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-muted);
}

/* 频道导航标签 */
.channel-nav-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
}

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

.channel-tag {
  display: inline-block;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: all 0.2s;
}

.channel-tag:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* 最新资讯列表 */
.latest-news-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.news-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.news-item h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.news-item h3 a {
  color: var(--color-primary);
  transition: color 0.2s;
}

.news-item h3 a:hover {
  color: var(--color-accent);
}

.news-summary {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

/* 专题卡片 */
.topic-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
}

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

.topic-card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: box-shadow 0.2s;
}

.topic-card:hover {
  box-shadow: 0 6px 20px rgba(26, 58, 92, 0.1);
}

.topic-card img,
.topic-card .topic-cover {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.topic-card h3 {
  font-size: 18px;
  padding: 16px 16px 0;
}

.topic-card h3 a {
  color: var(--color-primary);
}

.topic-card h3 a:hover {
  color: var(--color-accent);
}

.topic-card p {
  font-size: 14px;
  color: var(--color-muted);
  padding: 8px 16px 16px;
  margin-bottom: 0;
}

/* 编辑推荐 */
.editor-pick-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
}

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

.pick-item {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--color-border);
}

.pick-reason {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: rgba(230, 126, 34, 0.1);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.pick-item h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.pick-item h3 a {
  color: var(--color-primary);
}

.pick-item h3 a:hover {
  color: var(--color-accent);
}

.pick-item p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

/* 反馈区 */
.feedback-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 48px;
}

.feedback-content {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
}

.feedback-content p {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 12px;
}

/* 频道卡片（频道分类页） */
.channel-section {
  margin-bottom: 40px;
}

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

.channel-card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: box-shadow 0.2s;
}

.channel-card:hover {
  box-shadow: 0 6px 20px rgba(26, 58, 92, 0.1);
}

.channel-media {
  overflow: hidden;
}

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

.channel-body {
  padding: 20px;
}

.channel-name {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.channel-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

.channel-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.channel-link:hover {
  color: var(--color-primary);
}

/* 频道内容预览 */
.channel-preview-section {
  margin-bottom: 40px;
}

.preview-intro {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.preview-group {
  margin-bottom: 32px;
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--color-border);
}

.preview-channel-name {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.preview-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.preview-item {
  padding: 12px;
  background-color: var(--color-bg);
  border-radius: 4px;
}

.preview-item a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  display: block;
  margin-bottom: 4px;
}

.preview-item a:hover {
  color: var(--color-accent);
}

.preview-summary {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

/* 相关链接侧栏（频道页） */
.related-links {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.related-title {
  font-size: 20px;
  color: var(--color-primary);
  margin-bottom: 20px;
}

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

.related-col h3 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.related-col ul li {
  margin-bottom: 8px;
}

.related-col ul a {
  font-size: 14px;
  color: var(--color-muted);
}

.related-col ul a:hover {
  color: var(--color-accent);
}

/* 两栏布局（指南页、解读页） */
.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
}

.layout-shell.sidebar-right {
  grid-template-columns: minmax(0, 1fr) 320px;
}

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

/* 侧栏 */
.sidebar {
  min-width: 0;
}

.sidebar-block,
.sidebar-card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.sidebar-block h3,
.sidebar-card h2 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-links li {
  margin-bottom: 10px;
}

.sidebar-links a {
  font-size: 14px;
  color: var(--color-text);
  display: block;
  padding: 6px 0;
  transition: color 0.2s;
}

.sidebar-links a:hover {
  color: var(--color-accent);
}

/* 指南文章 */
.guide-article {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
}

.article-media {
  margin-bottom: 24px;
  border-radius: var(--radius);
  overflow: hidden;
}

.article-media img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.article-media figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 8px 12px;
  background-color: var(--color-bg);
}

.guide-article > p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 20px;
}

.guide-section {
  margin-bottom: 32px;
}

.guide-section h2 {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.guide-section p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 16px;
}

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

.step-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px;
  background-color: var(--color-bg);
  border-radius: 4px;
  font-size: 15px;
  line-height: 1.6;
}

/* 深度解读文章 */
.article-body {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
}

.article-section {
  margin-bottom: 32px;
}

.article-section h2,
.article-section h3 {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.article-section p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 16px;
}

.related-inline {
  background-color: var(--color-bg);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 24px;
}

.related-inline h3 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.related-inline ul li {
  margin-bottom: 8px;
}

.related-inline ul a {
  font-size: 14px;
  color: var(--color-primary);
}

.related-inline ul a:hover {
  color: var(--color-accent);
}

/* 专题页 */
.topic-list-section {
  margin-bottom: 48px;
}

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

.topic-content {
  padding: 0;
}

.topic-content h3 {
  font-size: 18px;
  padding: 16px 16px 0;
}

.topic-content h3 a {
  color: var(--color-primary);
}

.topic-content h3 a:hover {
  color: var(--color-accent);
}

.topic-content p {
  font-size: 14px;
  color: var(--color-muted);
  padding: 8px 16px;
  margin-bottom: 0;
}

.topic-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  margin: 0 16px 16px;
}

.topic-link:hover {
  color: var(--color-primary);
}

.topic-intro-section {
  margin-bottom: 48px;
}

.intro-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.intro-item {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--color-border);
}

.intro-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.intro-item p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.intro-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.intro-link:hover {
  color: var(--color-primary);
}

.topic-sidebar {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--color-border);
  margin-top: 48px;
}

.topic-sidebar h2 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-list li {
  margin-bottom: 10px;
}

.sidebar-list a {
  font-size: 14px;
  color: var(--color-text);
  display: block;
  padding: 6px 0;
  transition: color 0.2s;
}

.sidebar-list a:hover {
  color: var(--color-accent);
}

/* 404 页面 */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1 0 auto;
}

.error-box {
  text-align: center;
  max-width: 480px;
  width: 100%;
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 48px 32px;
  border: 1px solid var(--color-border);
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-box h1 {
  font-size: 24px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.error-btn {
  display: inline-block;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius);
  min-height: 44px;
  line-height: 1.4;
  transition: background-color 0.2s;
}

.error-btn:hover {
  background-color: #14304f;
  color: var(--color-white);
}

/* ============================================================
   pages - 首页特有模块
   ============================================================ */

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

.site-home .hero-section {
  padding-top: 48px;
}

/* ============================================================
   responsive - 响应式规则
   ============================================================ */

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

  .hero-media img {
    height: 280px;
  }

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

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

  .layout-shell,
  .layout-shell.sidebar-right {
    grid-template-columns: 1fr;
  }

  .sidebar {
    margin-top: 0;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* 手机端 768px 断点 */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 20px;
  }

  h3 {
    font-size: 17px;
  }

  .header-inner {
    height: 64px;
    padding: 0 16px;
  }

  .brand-name {
    font-size: 18px;
  }

  .brand-slogan {
    font-size: 11px;
  }

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

  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 8px 16px 16px;
  }

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

  .nav-list li {
    border-bottom: 1px solid var(--color-border);
  }

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

  .nav-list a {
    display: block;
    padding: 14px 8px;
    font-size: 15px;
    border-bottom: none;
  }

  .nav-list a.is-current {
    border-bottom: none;
    background-color: rgba(230, 126, 34, 0.08);
    border-radius: 4px;
    padding-left: 12px;
  }

  /* 首页 */
  .hero-section {
    padding: 24px 16px;
    gap: 20px;
  }

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

  .hero-content h1 {
    font-size: 26px;
  }

  .channel-nav-section,
  .latest-news-section,
  .topic-section,
  .editor-pick-section,
  .feedback-section {
    padding: 24px 16px;
  }

  .channel-tags {
    gap: 8px;
  }

  .channel-tag {
    padding: 8px 14px;
    font-size: 13px;
  }

  .news-item {
    padding: 16px 0;
  }

  .news-item h3 {
    font-size: 16px;
  }

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

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

  .feedback-content {
    padding: 24px;
  }

  /* 内页 */
  .inner-main {
    padding: 0 16px 32px;
  }

  .breadcrumb {
    padding-top: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
  }

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

  .page-title {
    font-size: 26px;
  }

  .page-description {
    font-size: 15px;
  }

  .section-title {
    font-size: 20px;
    margin-bottom: 16px;
  }

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

  .channel-media img {
    height: 140px;
  }

  .channel-body {
    padding: 16px;
  }

  .preview-group {
    padding: 16px;
  }

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

  .guide-article,
  .article-body {
    padding: 20px;
  }

  .article-media img {
    height: 180px;
  }

  .step-item {
    flex-direction: column;
    gap: 4px;
    padding: 12px;
  }

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

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

  .intro-item {
    padding: 16px;
  }

  .topic-sidebar {
    padding: 16px;
    margin-top: 32px;
  }

  /* 页脚 */
  .footer-inner {
    padding: 32px 16px 20px;
    gap: 24px;
  }

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

  .footer-col h3 {
    font-size: 15px;
    margin-bottom: 8px;
  }

  .footer-legal {
    padding-top: 16px;
  }

  /* 404 */
  .error-main {
    padding: 48px 16px;
  }

  .error-box {
    padding: 32px 20px;
  }

  .error-code {
    font-size: 56px;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .brand-slogan {
    display: none;
  }

  .btn {
    display: block;
    width: 100%;
  }

  .footer-legal p {
    font-size: 12px;
  }
}