/* ==========================================================================
   糖豆视频 · 整站样式表
   版本：1.0
   说明：本站为视频内容导航站，样式遵循百科索引风格，浅灰底、蓝链接。
   ========================================================================== */

/* ==========================================================================
   Base / Reset
   ========================================================================== */
*, *::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: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #202124;
  background-color: #f7f8fa;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: #0b57d0;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.15s ease;
}

a:hover {
  color: #0842a0;
}

ul, ol {
  padding-left: 1.4em;
}

h1, h2, h3, h4 {
  line-height: 1.35;
  font-weight: 700;
  color: #202124;
}

h1 {
  font-size: 28px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 17px;
}

p {
  margin-bottom: 0.8em;
}

/* ==========================================================================
   Layout / 全站骨架
   ========================================================================== */
.site-header {
  background-color: #ffffff;
  border-bottom: 1px solid #e0e2e6;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand-link {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: #202124;
  letter-spacing: 0.5px;
}

.brand-name::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: #0b57d0;
  margin-right: 10px;
  border-radius: 2px;
}

.site-nav .nav-list {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 2px;
}

.site-nav .nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: #5f6368;
  text-decoration: none;
  border-radius: 4px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.site-nav .nav-list a:hover {
  background-color: #f1f3f4;
  color: #202124;
}

.site-nav .nav-list a.is-current {
  color: #0b57d0;
  font-weight: 600;
  background-color: #e8f0fe;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 44px;
  height: 44px;
  padding: 10px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #202124;
  border-radius: 1px;
}

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

.site-main.home-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 48px;
}

.site-main.inner-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 24px 48px;
}

.site-footer {
  background-color: #ffffff;
  border-top: 1px solid #e0e2e6;
  margin-top: auto;
}

.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-col h2 {
  font-size: 16px;
  margin-bottom: 12px;
  color: #202124;
}

.footer-col p {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 12px;
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

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

.footer-col ul a {
  font-size: 14px;
  color: #5f6368;
  text-decoration: none;
}

.footer-col ul a:hover {
  color: #0b57d0;
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid #e0e2e6;
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: #5f6368;
  margin: 0;
}

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

/* 面包屑导航 */
.breadcrumb {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.breadcrumb a {
  color: #0b57d0;
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  color: #9aa0a6;
  margin: 0 2px;
}

.breadcrumb-current {
  color: #5f6368;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid #e0e2e6;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: #202124;
  margin-bottom: 8px;
}

.page-description {
  font-size: 16px;
  color: #5f6368;
  max-width: 780px;
}

.page-intro {
  font-size: 16px;
  color: #5f6368;
  margin-bottom: 28px;
  max-width: 780px;
}

/* 正文区与侧栏布局 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 32px;
  align-items: start;
}

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

/* 侧栏 */
.page-aside {
  min-width: 0;
}

.aside-block,
.aside-module {
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.aside-block h2,
.aside-module h2,
.aside-title {
  font-size: 16px;
  font-weight: 700;
  color: #202124;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #f1f3f4;
}

.aside-nav,
.aside-nav-list,
.toc-list,
.aside-status-list {
  list-style: none;
  padding: 0;
}

.aside-nav li,
.aside-nav-list li,
.toc-list li {
  margin-bottom: 6px;
}

.aside-nav a,
.aside-nav-list a,
.toc-list a {
  font-size: 14px;
  color: #0b57d0;
  text-decoration: none;
  display: block;
  padding: 4px 0;
}

.aside-nav a:hover,
.aside-nav-list a:hover,
.toc-list a:hover {
  text-decoration: underline;
}

/* 状态标记 */
.status-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 3px;
  line-height: 1.6;
}

.status-verified {
  background-color: #e6f4ea;
  color: #188038;
}

.status-pending {
  background-color: #fef7e0;
  color: #b06000;
}

.status-changed {
  background-color: #fce8e6;
  color: #d93025;
}

.status-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 1px 8px;
  border-radius: 3px;
  line-height: 1.5;
}

/* 相关链接区块 */
.related-links {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid #e0e2e6;
}

.related-links h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.related-links ul {
  list-style: none;
  padding: 0;
}

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

.related-links ul a {
  font-size: 15px;
}

/* 图片容器 */
figure {
  margin: 0;
}

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

figcaption {
  font-size: 13px;
  color: #5f6368;
  margin-top: 8px;
  line-height: 1.5;
}

/* ==========================================================================
   Components / 首页模块
   ========================================================================== */

/* 首屏摘要区 */
.hero-summary {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 36px;
  margin-bottom: 32px;
}

.hero-copy h1 {
  font-size: 28px;
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero-copy p {
  color: #5f6368;
  margin-bottom: 12px;
  max-width: 560px;
}

.hero-figure {
  border-radius: 8px;
  overflow: hidden;
}

.hero-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.hero-figure figcaption {
  padding: 8px 12px;
  background-color: #f8f9fa;
}

/* 栏目索引网格 */
.column-index {
  margin-bottom: 32px;
}

.column-index > h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

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

.index-card {
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 20px;
  text-decoration: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.index-card:hover {
  border-color: #0b57d0;
  box-shadow: 0 2px 8px rgba(11, 87, 208, 0.08);
}

.index-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: #0b57d0;
}

.index-card p {
  font-size: 14px;
  color: #5f6368;
  margin: 0;
  line-height: 1.6;
}

/* 今日焦点 */
.featured-topic {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: center;
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 32px;
}

.featured-topic-copy h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

.featured-topic-copy p {
  color: #5f6368;
  margin-bottom: 12px;
}

.text-link {
  font-weight: 600;
}

.featured-figure {
  border-radius: 8px;
  overflow: hidden;
}

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

.featured-figure figcaption {
  padding: 8px 12px;
  background-color: #f8f9fa;
}

/* 观看路线四步 */
.manual-steps {
  margin-bottom: 32px;
}

.manual-steps > h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

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

.step-item {
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 20px;
}

.step-num {
  display: inline-block;
  width: 28px;
  height: 28px;
  background-color: #0b57d0;
  color: #ffffff;
  border-radius: 50%;
  text-align: center;
  line-height: 28px;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

.step-item p {
  font-size: 14px;
  color: #5f6368;
  margin: 0;
  line-height: 1.6;
}

.steps-footnote {
  margin-top: 16px;
  font-size: 14px;
  color: #5f6368;
}

.steps-footnote a {
  font-weight: 600;
}

/* 最近修订 */
.recent-changes {
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 28px;
  margin-bottom: 32px;
}

.recent-changes > h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

.change-list {
  padding-left: 1.4em;
  margin-bottom: 16px;
}

.change-list li {
  margin-bottom: 16px;
}

.change-list h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.change-list p {
  font-size: 14px;
  color: #5f6368;
  margin: 0;
}

/* 补充入口 */
.supplementary-links {
  margin-bottom: 32px;
}

.supplementary-links > h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

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

.supp-card {
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 24px;
  text-decoration: none;
  transition: border-color 0.15s ease;
}

.supp-card:hover {
  border-color: #0b57d0;
}

.supp-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: #0b57d0;
}

.supp-card p {
  font-size: 14px;
  color: #5f6368;
  margin: 0;
}

/* ==========================================================================
   Components / 频道地图页
   ========================================================================== */

.topic-group {
  margin-bottom: 36px;
}

.topic-group > h2 {
  font-size: 20px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 2px solid #e8f0fe;
}

.topic-desc {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 16px;
}

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

.channel-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 16px;
  transition: border-color 0.15s ease;
}

.channel-item:hover {
  border-color: #0b57d0;
}

.channel-media {
  border-radius: 6px;
  overflow: hidden;
}

.channel-media img {
  width: 120px;
  height: 80px;
  object-fit: cover;
}

.channel-body h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.channel-body p {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 4px;
  line-height: 1.6;
}

.channel-body .channel-entry {
  margin-top: 6px;
}

/* 侧栏状态说明 */
.status-list {
  list-style: none;
  padding: 0;
}

.status-list li {
  margin-bottom: 10px;
  font-size: 14px;
  color: #5f6368;
}

.aside-note {
  font-size: 13px;
  color: #5f6368;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #f1f3f4;
}

/* 频道页相关链接（导航式） */
.related-links-label {
  font-size: 14px;
  color: #5f6368;
  margin-right: 8px;
}

.related-links-item {
  font-size: 14px;
  margin-right: 12px;
}

/* ==========================================================================
   Components / 观看路线页
   ========================================================================== */

.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 32px;
  align-items: start;
}

.route-intro {
  margin-bottom: 32px;
}

.route-intro p {
  color: #5f6368;
  max-width: 780px;
}

.route-steps {
  margin-bottom: 36px;
}

.route-steps .step-item {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 24px;
  align-items: start;
  margin-bottom: 20px;
  padding: 24px;
}

.route-steps .step-content h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: #0b57d0;
}

.route-steps .step-content p {
  font-size: 15px;
  color: #5f6368;
  margin-bottom: 8px;
}

.step-figure {
  border-radius: 6px;
  overflow: hidden;
}

.step-figure img {
  width: 100%;
  height: 120px;
  object-fit: cover;
}

.step-figure figcaption {
  font-size: 12px;
  padding: 6px 8px;
  background-color: #f8f9fa;
  margin: 0;
}

/* 入口状态提示 */
.verify-tips {
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 32px;
}

.verify-tips h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.verify-tips p {
  font-size: 15px;
  color: #5f6368;
  margin-bottom: 12px;
}

.verify-tips ul {
  margin-bottom: 12px;
}

.verify-tips ul li {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 6px;
}

/* FAQ */
.faq-section {
  margin-bottom: 36px;
}

.faq-section h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.faq-item {
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: #0b57d0;
}

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

.faq-item summary:hover {
  background-color: #f8f9fa;
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: #5f6368;
  margin: 0;
}

/* 状态点 */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 6px;
}

.status-ok .status-dot {
  background-color: #188038;
}

.status-warn .status-dot {
  background-color: #f9ab00;
}

.status-change .status-dot {
  background-color: #d93025;
}

/* ==========================================================================
   Components / 专题集页
   ========================================================================== */

.feature-grid {
  margin-bottom: 36px;
}

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

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

.feature-card {
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.feature-card:hover {
  border-color: #0b57d0;
  box-shadow: 0 2px 8px rgba(11, 87, 208, 0.06);
}

.card-media {
  overflow: hidden;
}

.card-media figure {
  margin: 0;
}

.card-media img {
  width: 100%;
  height: 150px;
  object-fit: cover;
}

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

.card-body h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.card-tag {
  font-size: 13px;
  color: #0b57d0;
  font-weight: 600;
  margin-bottom: 8px;
}

.card-body p {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 10px;
  line-height: 1.6;
}

.card-links {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.card-links li {
  font-size: 13px;
}

.card-links a {
  color: #0b57d0;
}

/* 关联说明 */
.relation-notes {
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 36px;
}

.relation-notes h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.relation-notes p {
  font-size: 15px;
  color: #5f6368;
  margin-bottom: 12px;
}

.relation-list {
  padding-left: 1.4em;
}

.relation-list li {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 8px;
}

/* ==========================================================================
   Components / 修订记录页
   ========================================================================== */

.batch-section {
  margin-bottom: 36px;
}

.batch-section > h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.batch-section > p {
  font-size: 15px;
  color: #5f6368;
  margin-bottom: 20px;
}

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

.batch-item {
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 20px 24px;
  transition: background-color 0.15s ease;
}

.batch-item:hover {
  background-color: #f8f9fa;
}

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

.batch-scope {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 8px;
}

.batch-item ul {
  font-size: 14px;
  color: #5f6368;
  padding-left: 1.4em;
}

.batch-item ul li {
  margin-bottom: 4px;
}

/* 未覆盖说明 */
.uncovered-section {
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 32px;
}

.uncovered-section h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.uncovered-section p {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 12px;
}

.uncovered-list {
  padding-left: 1.4em;
  margin-bottom: 12px;
}

.uncovered-list li {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 6px;
}

.batch-figure {
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 32px;
}

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

.batch-figure figcaption {
  padding: 8px 12px;
  background-color: #f8f9fa;
}

/* ==========================================================================
   Components / 图例说明页
   ========================================================================== */

.legend-intro {
  margin-bottom: 32px;
}

.legend-intro h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.legend-intro p {
  font-size: 15px;
  color: #5f6368;
  margin-bottom: 12px;
}

.legend-media {
  border-radius: 8px;
  overflow: hidden;
  margin-top: 16px;
}

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

.legend-media figcaption {
  padding: 8px 12px;
  background-color: #f8f9fa;
}

.legend-table-section {
  margin-bottom: 32px;
}

.legend-table-section h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.legend-table-section > p {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 16px;
}

.status-table {
  width: 100%;
  border-collapse: collapse;
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  overflow: hidden;
  font-size: 14px;
}

.status-table th,
.status-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid #e0e2e6;
  vertical-align: top;
}

.status-table th {
  background-color: #f8f9fa;
  font-weight: 600;
  color: #202124;
}

.status-table tr:last-child td {
  border-bottom: none;
}

.status-table td {
  color: #5f6368;
  line-height: 1.6;
}

/* 核验建议 */
.verify-tips .tip-list {
  padding-left: 1.4em;
  margin-bottom: 12px;
}

.tip-list li {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 8px;
}

/* ==========================================================================
   Components / 站点说明页
   ========================================================================== */

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

.section-block h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.section-block p {
  font-size: 15px;
  color: #5f6368;
  margin-bottom: 12px;
  max-width: 780px;
}

.content-figure {
  border-radius: 8px;
  overflow: hidden;
  margin-top: 16px;
}

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

.content-figure figcaption {
  padding: 8px 12px;
  background-color: #f8f9fa;
}

.work-list,
.boundary-list {
  padding-left: 1.4em;
  margin-bottom: 12px;
}

.work-list li,
.boundary-list li {
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 8px;
  line-height: 1.6;
}

/* ==========================================================================
   Components / 404页
   ========================================================================== */

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

.error-panel {
  max-width: 560px;
  text-align: center;
  background-color: #ffffff;
  border: 1px solid #e0e2e6;
  border-radius: 8px;
  padding: 48px 40px;
}

.error-panel h1 {
  font-size: 28px;
  margin-bottom: 16px;
}

.error-lead {
  font-size: 18px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 8px;
}

.error-desc {
  font-size: 15px;
  color: #5f6368;
  margin-bottom: 24px;
}

.error-actions {
  margin-bottom: 32px;
}

.error-home {
  display: inline-block;
  background-color: #0b57d0;
  color: #ffffff;
  text-decoration: none;
  padding: 10px 24px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  transition: background-color 0.15s ease;
}

.error-home:hover {
  background-color: #0842a0;
  color: #ffffff;
}

.error-suggest {
  text-align: left;
  border-top: 1px solid #e0e2e6;
  padding-top: 20px;
}

.error-suggest h2 {
  font-size: 16px;
  margin-bottom: 12px;
}

.error-suggest ul {
  list-style: none;
  padding: 0;
}

.error-suggest ul li {
  margin-bottom: 8px;
}

.error-suggest ul a {
  font-size: 15px;
}

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

/* 平板与窄桌面 */
@media (max-width: 1024px) {
  .index-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .page-layout,
  .layout-shell {
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 24px;
  }
}

/* 移动端断点 */
@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
    min-height: 56px;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex-basis: 100%;
    display: block;
  }

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

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

  .site-nav .nav-list a {
    padding: 12px 8px;
    border-radius: 0;
    border-bottom: 1px solid #f1f3f4;
  }

  .site-nav .nav-list a.is-current {
    background-color: transparent;
  }

  .site-main.home-main,
  .site-main.inner-main {
    padding: 20px 16px 40px;
  }

  .hero-summary {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 24px 20px;
  }

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

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

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

  .featured-topic {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 24px 20px;
  }

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

  .steps-row {
    grid-template-columns: 1fr;
  }

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

  .page-layout,
  .layout-shell {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-aside {
    order: 2;
  }

  .channel-item {
    grid-template-columns: 100px 1fr;
    gap: 12px;
    padding: 12px;
  }

  .channel-media img {
    width: 100px;
    height: 70px;
  }

  .route-steps .step-item {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px;
  }

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

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

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

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

/* 小屏手机 */
@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

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

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

  .status-table {
    font-size: 13px;
  }

  .status-table th,
  .status-table td {
    padding: 10px 12px;
  }
}

/* ==========================================================================
   Accessibility / 无障碍
   ========================================================================== */

:focus-visible {
  outline: 2px solid #0b57d0;
  outline-offset: 2px;
}

.nav-toggle:focus-visible,
.brand-link:focus-visible,
a:focus-visible {
  outline: 2px solid #0b57d0;
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}