/* ============================================================
   九一视频 · 整站样式表
   数字出版风：纸色底、深墨文字、朱砂强调
   ============================================================ */

/* ============================================================
   Base — 变量、重置、全局基础
   ============================================================ */

:root {
  --color-paper: #f5f1e8;
  --color-ink: #1f1d1a;
  --color-cinnabar: #a63a1b;
  --color-line: #e8e2d5;
  --color-card: #ffffff;
  --color-ink-soft: #4a453c;
  --color-ink-muted: #6b655a;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "SimSun", "Songti SC", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --shell-width: 960px;
  --sidebar-width: 180px;
  --content-max: 720px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --header-h: 60px;
}

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

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

body {
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  min-height: 100vh;
}

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

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

a:hover {
  color: #7c2a12;
  text-decoration: underline;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-ink);
}

h1 {
  font-size: 28px;
}

h2 {
  font-size: 20px;
}

h3 {
  font-size: 17px;
}

p {
  margin-bottom: 0.5em;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   Layout — 全站骨架、页头、页脚、主容器
   ============================================================ */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ----- 页头 ----- */

.site-header {
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-line);
  position: relative;
  z-index: 100;
}

.header-inner {
  max-width: var(--shell-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--color-ink);
  text-decoration: none;
}

.brand-link:hover {
  text-decoration: none;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-issue {
  font-size: 12px;
  color: var(--color-cinnabar);
  font-weight: 600;
  border: 1px solid var(--color-cinnabar);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  line-height: 1.4;
}

/* ----- 主导航 ----- */

.site-nav {
  max-width: var(--shell-width);
  margin: 0 auto;
  padding: 0 24px;
}

.nav-list {
  display: flex;
  gap: 4px;
  padding: 6px 0;
}

.nav-item {
  flex-shrink: 0;
}

.nav-link {
  display: block;
  padding: 6px 14px;
  font-size: 14px;
  color: var(--color-ink);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-link:hover {
  background-color: var(--color-line);
  text-decoration: none;
}

.nav-link.is-current {
  background-color: var(--color-cinnabar);
  color: #fff;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  width: 40px;
  height: 40px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.nav-toggle-icon {
  display: block;
  width: 18px;
  height: 2px;
  background-color: var(--color-ink);
  position: relative;
  transition: background-color 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background-color: var(--color-ink);
  transition: transform 0.2s ease;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.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;
}

/* ----- 主内容 ----- */

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

.inner-main {
  max-width: var(--shell-width);
  margin: 0 auto;
  padding: 0 24px 48px;
  width: 100%;
}

/* ----- 页脚 ----- */

.site-footer {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-line);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--shell-width);
  margin: 0 auto;
  padding: 40px 24px 28px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.footer-brand-desc {
  font-size: 13px;
  color: var(--color-ink-muted);
  line-height: 1.6;
}

.footer-col-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-ink);
}

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

.footer-link {
  font-size: 13px;
  color: var(--color-ink-soft);
}

.footer-link:hover {
  color: var(--color-cinnabar);
}

.footer-bottom {
  border-top: 1px solid var(--color-line);
  padding: 16px 24px;
  text-align: center;
}

.copyright {
  font-size: 12px;
  color: var(--color-ink-muted);
  max-width: var(--shell-width);
  margin: 0 auto;
}

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

/* ----- 面包屑 ----- */

.breadcrumb {
  font-size: 13px;
  color: var(--color-ink-muted);
  padding: 20px 0 0;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

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

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

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

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

/* ----- 页面标题区 ----- */

.page-header {
  padding: 20px 0 28px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 32px;
}

.page-title {
  font-size: 28px;
  line-height: 1.4;
  margin-bottom: 8px;
}

.page-description {
  font-size: 15px;
  color: var(--color-ink-soft);
  max-width: 640px;
  line-height: 1.7;
}

.page-desc {
  font-size: 15px;
  color: var(--color-ink-soft);
  max-width: 640px;
  line-height: 1.7;
  margin-bottom: 8px;
}

/* ----- 区块标题 ----- */

.section-title {
  font-size: 20px;
  margin-bottom: 12px;
  padding-left: 12px;
  border-left: 3px solid var(--color-cinnabar);
}

.section-intro,
.section-desc {
  font-size: 14px;
  color: var(--color-ink-soft);
  margin-bottom: 24px;
  max-width: 640px;
}

/* ----- 文本链接 ----- */

.text-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-cinnabar);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

.text-link:hover {
  border-bottom-color: var(--color-cinnabar);
  text-decoration: none;
}

.text-link::after {
  content: "→";
  margin-left: 4px;
}

/* ----- 按钮 ----- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  min-height: 44px;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-cinnabar);
  color: #fff;
  border: 1px solid var(--color-cinnabar);
}

.btn-primary:hover {
  background-color: #7c2a12;
  border-color: #7c2a12;
  color: #fff;
  text-decoration: none;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-cinnabar);
  border: 1px solid var(--color-cinnabar);
}

.btn-secondary:hover {
  background-color: var(--color-cinnabar);
  color: #fff;
  text-decoration: none;
}

/* ----- 图片容器 ----- */

figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

figcaption {
  font-size: 12px;
  color: var(--color-ink-muted);
  padding: 8px 0;
  text-align: center;
  line-height: 1.5;
}

/* ============================================================
   Layout — 内页侧栏布局
   ============================================================ */

/* 内页侧栏布局：侧栏在前，主内容在后 */
.sidebar-left {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 32px;
  max-width: var(--shell-width);
  margin: 0 auto;
  padding: 0 24px 48px;
  width: 100%;
}

.sidebar-left .inner-main {
  max-width: none;
  padding: 0;
  min-width: 0;
}

/* 全局侧栏（pindao / wenda / fankui） */

.global-aside {
  padding-top: 24px;
}

.aside-nav-list {
  border: 1px solid var(--color-line);
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.aside-nav-item {
  border-bottom: 1px solid var(--color-line);
}

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

.aside-nav-link {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--color-ink);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.aside-nav-link:hover {
  background-color: var(--color-paper);
  text-decoration: none;
}

.aside-nav-item.is-current .aside-nav-link,
.aside-nav-link.is-current {
  background-color: var(--color-cinnabar);
  color: #fff;
  font-weight: 600;
}

/* 全局侧栏（zhuanti） */

.global-sidebar {
  padding-top: 24px;
}

.sidebar-nav-list {
  border: 1px solid var(--color-line);
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.sidebar-nav-item {
  border-bottom: 1px solid var(--color-line);
}

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

.sidebar-nav-link {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--color-ink);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.sidebar-nav-link:hover {
  background-color: var(--color-paper);
  text-decoration: none;
}

.sidebar-nav-item.is-current .sidebar-nav-link,
.sidebar-nav-link.is-current {
  background-color: var(--color-cinnabar);
  color: #fff;
  font-weight: 600;
}

/* 全局侧栏（gengxin） */

.global-side-nav {
  padding-top: 24px;
}

.side-nav-list {
  border: 1px solid var(--color-line);
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.side-nav-item {
  border-bottom: 1px solid var(--color-line);
}

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

.side-nav-link {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--color-ink);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.side-nav-link:hover {
  background-color: var(--color-paper);
  text-decoration: none;
}

.side-nav-item.is-current .side-nav-link,
.side-nav-link.is-current {
  background-color: var(--color-cinnabar);
  color: #fff;
  font-weight: 600;
}

/* ----- 页面辅助侧栏（pindao 频道速览 / shouce 页内目录） ----- */

.page-aside {
  padding-top: 24px;
}

.page-aside .aside-title,
.aside-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-cinnabar);
}

/* 频道速览 */

.aside-channel-list {
  border: 1px solid var(--color-line);
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.aside-channel-item {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-line);
  display: block;
}

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

.aside-channel-name {
  display: block;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.aside-channel-desc {
  display: block;
  font-size: 12px;
  color: var(--color-ink-muted);
  line-height: 1.5;
}

/* 页内目录 */

.aside-inner {
  border: 1px solid var(--color-line);
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: 16px;
}

.aside-list li {
  margin-bottom: 4px;
}

.aside-link {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-ink);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.aside-link:hover {
  background-color: var(--color-paper);
  border-left-color: var(--color-cinnabar);
  text-decoration: none;
}

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

.home-main {
  max-width: var(--shell-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

/* ----- 首页首屏：左目录 + 右封面焦点 ----- */

.hero-section {
  padding: 32px 0 40px;
}

.hero-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  align-items: start;
}

.hero-toc {
  border: 1px solid var(--color-line);
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: 20px 16px;
}

.toc-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-line);
}

.toc-item {
  margin-bottom: 4px;
}

.toc-link {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--color-ink);
  border-left: 2px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.toc-link:hover {
  background-color: var(--color-paper);
  border-left-color: var(--color-cinnabar);
  text-decoration: none;
}

.hero-focus {
  min-width: 0;
}

.hero-figure {
  width: 100%;
  aspect-ratio: 16 / 7;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 24px;
  background-color: var(--color-line);
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-kicker {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-cinnabar);
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.hero-title {
  font-size: 28px;
  margin-bottom: 12px;
}

.hero-slogan {
  font-size: 17px;
  font-family: var(--font-serif);
  color: var(--color-ink);
  margin-bottom: 12px;
  font-weight: 600;
}

.hero-desc {
  font-size: 14px;
  color: var(--color-ink-soft);
  max-width: 560px;
  margin-bottom: 24px;
}

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

/* ----- 首页模块通用 ----- */

.home-module {
  padding: 40px 0;
  border-top: 1px solid var(--color-line);
}

.module-head {
  margin-bottom: 28px;
}

.module-kicker {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.module-title {
  font-size: 20px;
  margin-bottom: 8px;
}

.module-desc {
  font-size: 14px;
  color: var(--color-ink-soft);
  max-width: 640px;
}

/* ----- 频道主次网格 ----- */

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

.channel-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s ease;
}

.channel-card:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.channel-featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.channel-figure {
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: var(--color-line);
}

.channel-featured .channel-figure {
  height: 100%;
  aspect-ratio: auto;
  min-height: 200px;
}

.channel-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.channel-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.channel-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-cinnabar);
  letter-spacing: 0.04em;
}

.channel-name {
  font-size: 17px;
  margin-bottom: 4px;
}

.channel-desc {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
  flex: 1;
}

.channel-meta {
  display: flex;
  gap: 16px;
  padding-top: 8px;
  border-top: 1px solid var(--color-line);
  margin-top: auto;
}

.meta-item {
  font-size: 12px;
  color: var(--color-ink-muted);
}

.meta-item::before {
  content: "·";
  color: var(--color-cinnabar);
  margin-right: 4px;
  font-weight: 700;
}

/* ----- 专题横卡 ----- */

.topic-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.topic-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: grid;
  grid-template-columns: 280px 1fr;
  transition: box-shadow 0.2s ease;
}

.topic-card:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.topic-figure {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 10;
  background-color: var(--color-line);
}

.topic-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.topic-body {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.topic-issue {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-cinnabar);
}

.topic-name {
  font-size: 17px;
  margin-bottom: 4px;
}

.topic-audience,
.topic-path {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
}

.topic-audience strong,
.topic-path strong {
  color: var(--color-ink);
  font-weight: 600;
  margin-right: 4px;
}

/* ----- 辑目时间线（首页） ----- */

.timeline {
  position: relative;
  padding-left: 24px;
  margin-bottom: 24px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background-color: var(--color-line);
}

.timeline-item {
  position: relative;
  padding-bottom: 24px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -24px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-cinnabar);
  border: 2px solid var(--color-paper);
}

.timeline-content {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.timeline-issue {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-cinnabar);
  margin-bottom: 4px;
}

.timeline-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.timeline-desc {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
  margin-bottom: 8px;
}

.timeline-scope {
  font-size: 12px;
  color: var(--color-ink-muted);
}

.timeline-scope strong {
  color: var(--color-ink);
  font-weight: 600;
  margin-right: 4px;
}

.module-footer-link {
  padding-top: 8px;
}

/* ----- 双栏引导 ----- */

.guide-duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.guide-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.guide-title {
  font-size: 17px;
  margin-bottom: 4px;
}

.guide-desc {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
}

.guide-points {
  margin-bottom: 8px;
}

.guide-points li {
  font-size: 13px;
  color: var(--color-ink-soft);
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
  line-height: 1.5;
}

.guide-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-cinnabar);
}

.guide-card .btn {
  align-self: flex-start;
  margin-top: auto;
}

/* ----- 反馈条 ----- */

.feedback-inner {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.feedback-title {
  font-size: 20px;
  margin-bottom: 8px;
}

.feedback-desc {
  font-size: 14px;
  color: var(--color-ink-soft);
  max-width: 520px;
}

/* ============================================================
   Pages — 频道索引 pindao
   ============================================================ */

/* ----- 频道档案 ----- */

.channel-archive {
  margin-bottom: 40px;
}

.channel-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
}

.channel-item-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 16px 20px;
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-line);
}

.channel-item-head .channel-name {
  font-size: 17px;
  margin-bottom: 0;
}

.channel-count {
  font-size: 12px;
  color: var(--color-ink-muted);
  font-weight: 600;
}

.channel-item-body {
  padding: 20px;
}

.channel-detail {
  margin-bottom: 12px;
}

.channel-detail-row {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 16px;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 13px;
}

.channel-detail-row:last-child {
  border-bottom: none;
}

.channel-detail-label {
  color: var(--color-cinnabar);
  font-weight: 600;
}

.channel-detail-value {
  color: var(--color-ink-soft);
  line-height: 1.6;
}

.channel-path-link {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-cinnabar);
  margin-top: 8px;
}

.channel-path-link:hover {
  text-decoration: underline;
}

/* 频道档案配图 */

.channel-figure {
  margin-bottom: 40px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-line);
  aspect-ratio: 16 / 6;
}

.channel-figure-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.channel-figure-caption {
  background-color: var(--color-card);
  padding: 10px;
}

/* ----- 频道边界对比 ----- */

.channel-compare {
  margin-bottom: 40px;
}

.compare-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 16px;
}

.compare-title {
  font-size: 16px;
  margin-bottom: 8px;
  padding-left: 12px;
  border-left: 3px solid var(--color-cinnabar);
}

.compare-text {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
  margin-bottom: 12px;
}

.compare-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-cinnabar);
}

/* ----- 频道小结 ----- */

.channel-summary {
  margin-bottom: 32px;
}

.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.summary-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 16 / 7;
}

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

.summary-caption {
  background-color: var(--color-card);
  padding: 8px;
}

.summary-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

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

/* ============================================================
   Pages — 专题选编 zhuanti
   ============================================================ */

.page-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 32px;
  max-width: var(--shell-width);
  margin: 0 auto;
  padding: 0 24px 48px;
  width: 100%;
}

.page-layout .inner-main {
  max-width: none;
  padding: 0;
  min-width: 0;
}

/* ----- 专题横卡列表 ----- */

.topic-card-list {
  margin-bottom: 40px;
}

.topic-card-list .topic-card {
  margin-bottom: 20px;
}

.topic-card-media {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 10;
  background-color: var(--color-line);
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  overflow: hidden;
}

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

.topic-card-body {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.topic-structure {
  margin-top: 4px;
}

.structure-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-ink-muted);
  margin-bottom: 6px;
}

.structure-list {
  list-style: decimal;
  padding-left: 20px;
}

.structure-list li {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
  padding: 2px 0;
}

/* ----- 观看路径提示 ----- */

.path-tip {
  margin-bottom: 40px;
}

.path-tip-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.path-tip-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-cinnabar);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.path-tip-text {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
}

.path-tip-text strong {
  color: var(--color-ink);
  font-weight: 600;
}

.path-tip img {
  width: 100%;
  max-height: 200px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-top: 16px;
}

/* ----- 专题与频道对照 ----- */

.topic-channel-note {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 40px;
}

.note-text {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.7;
  margin-bottom: 16px;
}

.note-list {
  margin-bottom: 16px;
}

.note-item {
  font-size: 13px;
  color: var(--color-ink-soft);
  padding: 6px 0;
  padding-left: 16px;
  position: relative;
  line-height: 1.5;
}

.note-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-cinnabar);
}

.note-item strong {
  color: var(--color-ink);
  font-weight: 600;
  margin-right: 4px;
}

/* ----- 相关链接 ----- */

.related-links {
  background-color: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.related-text {
  font-size: 13px;
  color: var(--color-ink-soft);
  margin-bottom: 0;
}

.related-link-group {
  display: flex;
  gap: 20px;
}

/* ============================================================
   Pages — 更新进展 gengxin
   ============================================================ */

/* ----- 辑目时间线（内页） ----- */

.revision-timeline {
  margin-bottom: 40px;
}

.timeline-figure {
  width: 100%;
  aspect-ratio: 16 / 6;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-line);
  margin-bottom: 24px;
}

.timeline-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.timeline-list {
  position: relative;
  padding-left: 28px;
}

.timeline-list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background-color: var(--color-line);
}

.timeline-item {
  position: relative;
  padding-bottom: 20px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--color-cinnabar);
  border: 3px solid var(--color-paper);
}

.revision-entry {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.revision-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.revision-issue {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-cinnabar);
  background-color: var(--color-paper);
  border: 1px solid var(--color-line);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
}

.revision-type {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-ink-soft);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
}

.revision-title {
  font-size: 16px;
  margin-bottom: 8px;
}

.revision-desc {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
  margin-bottom: 8px;
}

.revision-scope {
  font-size: 12px;
  color: var(--color-ink-muted);
  line-height: 1.5;
}

.revision-scope strong {
  color: var(--color-ink);
  font-weight: 600;
  margin-right: 4px;
}

.revision-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-cinnabar);
  display: inline-block;
  margin-top: 8px;
}

/* ----- 影响范围 ----- */

.impact-note {
  margin-bottom: 40px;
}

.impact-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-cinnabar);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.impact-text {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.7;
}

/* ----- 涉及栏目速览 ----- */

.revision-aside {
  padding-top: 24px;
}

.revision-aside .aside-list {
  border: 1px solid var(--color-line);
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.revision-aside .aside-item {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-line);
}

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

.aside-item-title {
  font-size: 15px;
  margin-bottom: 4px;
}

.aside-link {
  color: var(--color-ink);
}

.aside-link:hover {
  color: var(--color-cinnabar);
}

.aside-item-desc {
  font-size: 12px;
  color: var(--color-ink-muted);
  line-height: 1.5;
}

/* ============================================================
   Pages — 使用手册 shouce
   ============================================================ */

/* ----- 页面结构总览 ----- */

.manual-section {
  margin-bottom: 40px;
}

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

.structure-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-title {
  font-size: 16px;
  margin-bottom: 4px;
}

.card-text {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
  flex: 1;
}

/* ----- 浏览起点 ----- */

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

.start-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
}

.start-index {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-cinnabar);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.start-body {
  min-width: 0;
}

.start-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.start-text {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
  margin-bottom: 8px;
}

.start-path {
  font-size: 13px;
  color: var(--color-ink);
  background-color: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  display: inline-block;
}

/* ----- 内容边界 ----- */

.boundary-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.boundary-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.boundary-title {
  font-size: 15px;
  margin-bottom: 8px;
  padding-left: 12px;
  border-left: 3px solid var(--color-cinnabar);
}

.boundary-text {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
}

.manual-figure {
  width: 100%;
  aspect-ratio: 16 / 6;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-line);
}

.manual-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure-caption {
  background-color: var(--color-card);
  padding: 8px;
}

/* ============================================================
   Pages — 内容问答 wenda
   ============================================================ */

/* 内容问答页布局：main 直接包含面包屑 + header，然后才是 layout-shell */
.site-main.inner-main .layout-shell {
  padding: 0;
}

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

/* ----- 问题分类导航 ----- */

.faq-category {
  margin-bottom: 40px;
}

.section-head {
  margin-bottom: 8px;
}

.section-kicker {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.category-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: box-shadow 0.2s ease;
}

.category-card:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.category-name {
  font-size: 15px;
  margin-bottom: 4px;
}

.category-scene {
  font-size: 12px;
  color: var(--color-ink-muted);
  line-height: 1.5;
  flex: 1;
  min-width: 0;
  word-break: break-word;
}

.category-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-cinnabar);
}

/* ----- 问答分组 ----- */

.faq-groups {
  margin-bottom: 40px;
}

.faq-group {
  margin-bottom: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-line);
}

.group-head {
  margin-bottom: 16px;
}

.group-kicker {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.group-title {
  font-size: 20px;
  margin-bottom: 6px;
}

.group-desc {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
}

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

.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  line-height: 1.5;
  transition: background-color 0.2s ease;
}

.faq-item summary:hover {
  background-color: var(--color-paper);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 18px;
  color: var(--color-cinnabar);
  font-weight: 700;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-question {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
}

.faq-answer {
  padding: 0 20px 16px;
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.7;
  border-top: 1px solid var(--color-line);
  padding-top: 12px;
}

/* 问答配图 */

.faq-figure {
  width: 100%;
  aspect-ratio: 16 / 6;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-line);
  margin-top: 32px;
}

.faq-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.faq-figure-caption {
  background-color: var(--color-card);
  padding: 8px;
}

/* ============================================================
   Pages — 内容反馈 fankui
   ============================================================ */

/* ----- 反馈步骤 ----- */

.feedback-steps {
  margin-bottom: 40px;
}

.feedback-figure {
  width: 100%;
  aspect-ratio: 16 / 6;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-line);
  margin-bottom: 24px;
}

.feedback-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feedback-caption {
  background-color: var(--color-card);
  padding: 8px;
}

.steps-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.steps-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-cinnabar);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

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

.step-title {
  font-size: 15px;
  margin-bottom: 6px;
}

.step-text {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
}

/* ----- 反馈类型 ----- */

.feedback-types {
  margin-bottom: 40px;
}

.types-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.type-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.type-card-title {
  font-size: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-line);
}

.type-card-scene {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
}

.type-card-info {
  font-size: 12px;
  color: var(--color-ink-muted);
  line-height: 1.6;
  flex: 1;
}

.type-card-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-cinnabar);
  margin-top: auto;
  padding-top: 8px;
}

/* ----- 关联问答条 ----- */

.faq-link-block {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-cinnabar);
  border-radius: var(--radius-md);
  padding: 24px;
}

.faq-link-content .section-title {
  margin-bottom: 8px;
}

.faq-link-text {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.6;
  margin-bottom: 16px;
}

.faq-link-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  background-color: var(--color-cinnabar);
  color: #fff;
  border: 1px solid var(--color-cinnabar);
  min-height: 44px;
  transition: background-color 0.2s ease;
}

.faq-link-button:hover {
  background-color: #7c2a12;
  text-decoration: none;
  color: #fff;
}

/* ----- 侧栏辅助说明 ----- */

.aside-note {
  margin-top: 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px;
}

.aside-note-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-ink);
}

.aside-note-text {
  font-size: 12px;
  color: var(--color-ink-muted);
  line-height: 1.6;
  margin-bottom: 10px;
}

.aside-note-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-cinnabar);
}

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

.error-main {
  max-width: var(--shell-width);
  margin: 0 auto;
  padding: 60px 24px;
  width: 100%;
}

.error-panel {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 64px;
  font-weight: 700;
  color: var(--color-cinnabar);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 24px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.7;
  margin-bottom: 12px;
}

.error-tip {
  font-size: 13px;
  color: var(--color-ink-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

.error-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  background-color: var(--color-cinnabar);
  color: #fff;
  border: 1px solid var(--color-cinnabar);
  min-height: 44px;
  transition: background-color 0.2s ease;
}

.error-link:hover {
  background-color: #7c2a12;
  text-decoration: none;
  color: #fff;
}

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

/* ----- 中等屏幕（≤1024px） ----- */

@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 24px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

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

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

/* ----- 移动端（≤768px） ----- */

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

  .nav-toggle {
    display: flex;
  }

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

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

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

  .nav-item {
    width: 100%;
  }

  .nav-link {
    padding: 12px 8px;
    font-size: 15px;
    border-radius: 0;
    border-bottom: 1px solid var(--color-line);
  }

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

  /* 首页 */
  .home-main {
    padding: 0 16px 40px;
  }

  .hero-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* 移动端顺序：先右列封面焦点区，再左列页内目录 */
  .hero-toc {
    order: 2;
  }

  .hero-focus {
    order: 1;
  }

  .hero-figure {
    aspect-ratio: 16 / 9;
  }

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

  .channel-featured {
    grid-template-columns: 1fr;
  }

  .channel-featured .channel-figure {
    aspect-ratio: 16 / 9;
    min-height: 0;
  }

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

  .topic-figure {
    aspect-ratio: 16 / 9;
  }

  .guide-duo {
    grid-template-columns: 1fr;
  }

  .feedback-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
  }

  /* 内页布局 */
  .sidebar-left {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0 16px 40px;
  }

  .page-layout {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0 16px 40px;
  }

  /* 移动端：辅助侧栏排到主内容之后 */
  .sidebar-left .global-aside,
  .sidebar-left .page-aside,
  .sidebar-left .global-side-nav,
  .sidebar-left .revision-aside,
  .page-layout .global-sidebar {
    order: 2;
    padding-top: 0;
    margin-top: 32px;
  }

  .sidebar-left .inner-main,
  .page-layout .inner-main {
    order: 1;
  }

  .inner-main {
    padding: 0 16px 40px;
  }

  .breadcrumb {
    padding-top: 16px;
  }

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

  /* 频道索引 */
  .channel-item-head {
    flex-direction: column;
    gap: 4px;
  }

  .channel-detail-row {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 8px 0;
  }

  .summary-grid {
    grid-template-columns: 1fr;
  }

  /* 专题选编 */
  .topic-card-media {
    aspect-ratio: 16 / 9;
  }

  .path-tip-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .related-links {
    flex-direction: column;
    align-items: flex-start;
  }

  /* 使用手册 */
  .structure-grid {
    grid-template-columns: 1fr;
  }

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

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

  /* 内容问答 */
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 内容反馈 */
  .steps-list {
    grid-template-columns: 1fr;
  }

  .types-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    padding: 12px 16px;
  }

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

  .error-panel {
    padding: 40px 24px;
  }
}

/* ----- 小屏手机（≤480px） ----- */

@media (max-width: 480px) {
  .category-grid {
    grid-template-columns: 1fr;
  }

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

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

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

  .channel-meta {
    flex-direction: column;
    gap: 4px;
  }

  .topic-body {
    padding: 16px;
  }

  .timeline-content {
    padding: 14px 16px;
  }

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

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}