/* ============================================================
   base：基础重置与全站排版
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: #202124;
  background-color: #ffffff;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
p,
figure,
dl,
dd,
ol,
ul {
  margin: 0;
  padding: 0;
}

ol,
ul {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 600;
  line-height: 1.4;
  color: #202124;
}

a {
  color: #1a5fb4;
  text-decoration: none;
  text-underline-offset: 3px;
}

a:hover {
  color: #0b57d0;
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid #1a5fb4;
  outline-offset: 2px;
}

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

button {
  font: inherit;
  color: inherit;
}

table {
  border-collapse: collapse;
  width: 100%;
}

caption {
  text-align: left;
}

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

/* ============================================================
   layout：全站骨架（页头、导航、主容器、面包屑、页脚）
   ============================================================ */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: #ffffff;
}

.site-header {
  border-bottom: 1px solid #dadce0;
  background-color: #ffffff;
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 24px;
  min-height: 60px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #202124;
  font-weight: 600;
  font-size: 17px;
  padding: 10px 0;
}

.brand:hover {
  text-decoration: none;
  color: #0b57d0;
}

.brand-mark {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.brand-name {
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  padding: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  background-color: #ffffff;
  border: 1px solid #dadce0;
  border-radius: 4px;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: #202124;
}

.primary-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 20px;
}

.nav-list li {
  display: flex;
}

.nav-list a {
  display: inline-block;
  padding: 10px 2px;
  font-size: 15px;
  color: #3c4043;
  border-bottom: 2px solid transparent;
}

.nav-list a:hover {
  color: #0b57d0;
  text-decoration: none;
  border-bottom-color: #dadce0;
}

.nav-list a.is-current {
  color: #0b57d0;
  border-bottom-color: #1a5fb4;
  font-weight: 600;
}

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

.home-main {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 24px 56px;
}

.inner-main {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 24px 56px;
}

/* 页面布局：默认正文在前，侧栏在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 780px) 240px;
  gap: 40px;
  align-items: start;
  margin-top: 24px;
}

.page-layout > .content-column,
.page-layout > .page-content {
  min-width: 0;
}

.page-layout > .side-column,
.page-layout > .page-aside,
.page-layout > .page-sidebar {
  min-width: 0;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 16px 0 0;
  font-size: 13px;
  color: #5f6368;
}

.breadcrumb a {
  color: #1a5fb4;
}

.breadcrumb-sep {
  color: #9aa0a6;
}

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

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.breadcrumb-list li + li::before {
  content: "/";
  color: #9aa0a6;
  margin-right: 6px;
}

/* 页面标题区 */
.page-header {
  padding: 12px 0 0;
}

.page-title {
  font-size: 28px;
  font-weight: 600;
  line-height: 1.4;
  color: #202124;
  margin-top: 8px;
}

/* 页脚 */
.site-footer {
  flex-shrink: 0;
  background-color: #f4f5f7;
  border-top: 1px solid #dadce0;
  margin-top: 40px;
}

.footer-inner {
  max-width: 1060px;
  margin: 0 auto;
  padding: 36px 24px 24px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px;
}

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 12px;
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-list a {
  font-size: 14px;
  color: #3c4043;
  line-height: 1.6;
}

.footer-list a:hover {
  color: #0b57d0;
}

.footer-bottom {
  max-width: 1060px;
  margin: 0 auto;
  padding: 16px 24px 28px;
  border-top: 1px solid #dadce0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
}

.footer-copy,
.footer-note {
  font-size: 13px;
  color: #5f6368;
  line-height: 1.6;
}

/* ============================================================
   components：通用组件
   ============================================================ */
/* 版本条 / 校对条 */
.proof-bar {
  margin-top: 16px;
  padding: 10px 14px;
  background-color: #f4f5f7;
  border-left: 3px solid #dadce0;
  border-radius: 4px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 16px;
  font-size: 13px;
  color: #5f6368;
}

.proof-bar p {
  margin: 0;
}

.proof-status,
.proof-text,
.proof-label {
  color: #3c4043;
  font-weight: 600;
}

.proof-desc,
.proof-note,
.proof-date {
  color: #5f6368;
}

.proof-link {
  color: #1a5fb4;
}

.proof-anchors {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
}

.proof-anchors a {
  color: #1a5fb4;
  font-size: 13px;
}

/* 本页目录 */
.topic-toc,
.page-toc {
  margin-top: 24px;
  background-color: #f4f5f7;
  border: 1px solid #dadce0;
  border-radius: 4px;
  padding: 14px 18px;
}

.toc-title {
  font-size: 14px;
  font-weight: 600;
  color: #3c4043;
  margin-bottom: 8px;
}

.toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}

.toc-list a {
  font-size: 14px;
  color: #1a5fb4;
}

/* 页面导语 */
.page-title-block {
  margin-top: 16px;
}

.page-lead {
  font-size: 16px;
  color: #3c4043;
  line-height: 1.75;
}

.page-lead + .page-lead {
  margin-top: 8px;
}

.page-head {
  margin-top: 12px;
}

/* 正文小节 */
.content-section,
.section-block,
.section {
  margin-top: 32px;
}

.content-section > h2,
.section-block > h2,
.section > h2,
.read-next > h2,
.read-more > h2 {
  font-size: 20px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #dadce0;
}

.content-section > p,
.section-block > p,
.section > p {
  color: #202124;
  margin-bottom: 14px;
}

.content-section > p:last-child,
.section-block > p:last-child,
.section > p:last-child {
  margin-bottom: 0;
}

.section-note {
  margin-top: 14px;
  font-size: 14px;
  color: #5f6368;
}

.section-note a {
  color: #1a5fb4;
}

/* 图片与图注 */
.content-figure,
.section-figure,
.topic-figure,
.term-figure,
.media-figure {
  margin: 18px 0;
  border: 1px solid #dadce0;
  border-radius: 4px;
  overflow: hidden;
  background-color: #f4f5f7;
}

.content-figure img,
.section-figure img,
.topic-figure img,
.term-figure img,
.media-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.content-figure figcaption,
.section-figure figcaption,
.topic-figure figcaption,
.term-figure figcaption,
.media-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: #5f6368;
  line-height: 1.6;
  background-color: #ffffff;
  border-top: 1px solid #dadce0;
}

/* 表格通用 */
.table-wrap,
.table-scroll {
  overflow-x: auto;
  margin: 16px 0;
  border: 1px solid #dadce0;
  border-radius: 4px;
}

.data-table,
.channel-table,
.status-table,
.term-table {
  width: 100%;
  min-width: 520px;
  font-size: 14px;
  background-color: #ffffff;
}

.data-table caption,
.channel-table caption,
.status-table caption,
.term-table caption {
  padding: 10px 14px;
  font-size: 13px;
  color: #5f6368;
  text-align: left;
  border-bottom: 1px solid #dadce0;
  background-color: #f4f5f7;
}

.data-table th,
.data-table td,
.channel-table th,
.channel-table td,
.status-table th,
.status-table td,
.term-table th,
.term-table td {
  padding: 10px 14px;
  border-bottom: 1px solid #dadce0;
  text-align: left;
  vertical-align: top;
  line-height: 1.6;
}

.data-table thead th,
.channel-table thead th,
.status-table thead th,
.term-table thead th {
  background-color: #f4f5f7;
  font-weight: 600;
  color: #3c4043;
  white-space: nowrap;
}

.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td,
.channel-table tbody tr:last-child th,
.channel-table tbody tr:last-child td,
.status-table tbody tr:last-child th,
.status-table tbody tr:last-child td,
.term-table tbody tr:last-child th,
.term-table tbody tr:last-child td {
  border-bottom: none;
}

.channel-table tbody th {
  font-weight: 600;
  color: #202124;
  white-space: nowrap;
}

/* 编号流程 */
.step-flow,
.order-flow,
.precheck-list,
.step-list,
.process-list,
.check-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

.step-flow .step-item,
.order-flow .order-item {
  position: relative;
  padding: 14px 16px 14px 52px;
  background-color: #ffffff;
  border: 1px solid #dadce0;
  border-radius: 4px;
  counter-increment: stepflow;
}

.step-flow {
  counter-reset: stepflow;
}

.step-flow .step-item::before {
  content: counter(stepflow);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: #1a5fb4;
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.step-flow .step-item h3,
.order-flow .order-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.step-flow .step-item p,
.order-flow .order-item p {
  font-size: 15px;
  color: #3c4043;
  line-height: 1.7;
}

.step-flow .step-item .step-num {
  position: absolute;
  left: 14px;
  top: 14px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: #1a5fb4;
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

/* 带 step-num 的流程不再使用伪元素序号 */
.step-flow .step-item:has(.step-num)::before {
  display: none;
}

.order-flow {
  counter-reset: orderflow;
}

.order-flow .order-item {
  padding-left: 52px;
}

.order-flow .order-item::before {
  content: counter(orderflow);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: #f4f5f7;
  color: #1a5fb4;
  border: 1px solid #dadce0;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

/* 清单 */
.check-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.7;
  color: #3c4043;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #1a5fb4;
}

/* 规则列表 */
.rule-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
}

.rule-list .rule-item {
  padding: 12px 14px;
  background-color: #f4f5f7;
  border-radius: 4px;
  font-size: 15px;
  line-height: 1.7;
  color: #3c4043;
}

.rule-list .rule-item strong {
  color: #202124;
  font-weight: 600;
  margin-right: 4px;
}

/* 延伸阅读 */
.reading-list,
.read-next-list,
.read-more-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}

.reading-list li,
.read-next-list li,
.read-more-list li {
  padding: 10px 14px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  font-size: 15px;
  line-height: 1.7;
  background-color: #ffffff;
}

.reading-list a,
.read-next-list a,
.read-more-list a {
  color: #1a5fb4;
}

/* 侧栏通用 */
.side-block,
.side-box,
.sidebar-block,
.aside-block {
  background-color: #f4f5f7;
  border: 1px solid #dadce0;
  border-radius: 4px;
  padding: 16px;
  margin-bottom: 20px;
}

.side-block:last-child,
.side-box:last-child,
.sidebar-block:last-child,
.aside-block:last-child {
  margin-bottom: 0;
}

.side-title,
.sidebar-title,
.aside-title {
  font-size: 15px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid #dadce0;
}

.side-list,
.sidebar-list,
.aside-list,
.aside-link-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.side-list li,
.sidebar-list li,
.aside-list li,
.aside-link-list li {
  font-size: 14px;
  line-height: 1.6;
  color: #3c4043;
}

.side-list a,
.sidebar-list a,
.aside-list a,
.aside-link-list a {
  color: #1a5fb4;
}

.side-label {
  display: block;
  font-weight: 600;
  color: #202124;
  font-size: 13px;
}

.side-text {
  font-size: 14px;
  color: #3c4043;
  line-height: 1.7;
}

.side-link {
  color: #1a5fb4;
}

.side-item {
  font-size: 14px;
  line-height: 1.6;
}

.side-item a {
  color: #1a5fb4;
}

.aside-link-note {
  font-size: 13px;
  color: #5f6368;
  line-height: 1.6;
  margin-top: 8px;
}

/* 侧栏小表 */
.side-table {
  width: 100%;
  font-size: 13px;
  border-collapse: collapse;
}

.side-table th,
.side-table td {
  padding: 6px 4px;
  border-bottom: 1px solid #dadce0;
  text-align: left;
  vertical-align: top;
  line-height: 1.5;
}

.side-table th {
  font-weight: 600;
  color: #3c4043;
  white-space: nowrap;
}

.side-table tbody tr:last-child th,
.side-table tbody tr:last-child td {
  border-bottom: none;
}

/* 内容边界提示条 */
.content-boundary {
  margin-top: 32px;
  padding: 14px 18px;
  background-color: #fbe9e7;
  border-left: 3px solid #c5221f;
  border-radius: 4px;
}

.content-boundary p {
  font-size: 14px;
  color: #5f6368;
  line-height: 1.7;
}

/* ============================================================
   pages：首页
   ============================================================ */
.version-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  padding: 12px 0;
  border-bottom: 1px solid #dadce0;
  font-size: 13px;
  color: #5f6368;
}

.version-status {
  color: #3c4043;
}

.version-anchors {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
}

.version-anchors a {
  font-size: 13px;
  color: #1a5fb4;
}

/* 首屏：左索引列 + 右主视觉 */
.hero-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  margin-top: 32px;
}

.hero-index {
  background-color: #f4f5f7;
  border: 1px solid #dadce0;
  border-radius: 4px;
  padding: 16px;
}

.hero-index-title {
  font-size: 15px;
  font-weight: 600;
  color: #202124;
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid #dadce0;
}

.hero-index-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-index-list li a {
  display: block;
  padding: 8px 6px;
  border-radius: 4px;
  color: #1a5fb4;
  border-left: 2px solid transparent;
}

.hero-index-list li a:hover {
  background-color: #ffffff;
  text-decoration: none;
  border-left-color: #1a5fb4;
}

.index-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: #1a5fb4;
  line-height: 1.5;
}

.index-desc {
  display: block;
  font-size: 13px;
  color: #5f6368;
  line-height: 1.5;
}

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

.hero-figure {
  margin: 0 0 20px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  overflow: hidden;
  background-color: #f4f5f7;
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.hero-title {
  font-size: 28px;
  font-weight: 600;
  line-height: 1.4;
  color: #202124;
  margin-bottom: 12px;
}

.hero-lead {
  font-size: 16px;
  color: #3c4043;
  line-height: 1.75;
}

.hero-lead + .hero-lead {
  margin-top: 8px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background-color: #1a5fb4;
  color: #ffffff;
  border-color: #1a5fb4;
}

.btn-primary:hover {
  background-color: #0b57d0;
  border-color: #0b57d0;
  color: #ffffff;
  text-decoration: none;
}

.btn-secondary {
  background-color: #ffffff;
  color: #1a5fb4;
  border-color: #dadce0;
}

.btn-secondary:hover {
  background-color: #f4f5f7;
  border-color: #1a5fb4;
  color: #0b57d0;
  text-decoration: none;
}

/* 首页各区块 */
.channels-overview,
.entry-cards,
.topics-overview,
.precheck,
.terms-preview,
.page-division {
  margin-top: 44px;
}

.channels-overview > h2,
.entry-cards > h2,
.topics-overview > h2,
.precheck > h2,
.terms-preview > h2,
.page-division > h2 {
  font-size: 20px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid #dadce0;
}

.section-intro {
  font-size: 15px;
  color: #5f6368;
  line-height: 1.7;
  margin-bottom: 16px;
}

.section-more {
  margin-top: 14px;
  font-size: 14px;
}

.section-more a {
  color: #1a5fb4;
}

/* 频道速览表（首页） */
.channels-overview .channel-table {
  border: 1px solid #dadce0;
  border-radius: 4px;
  overflow: hidden;
}

/* 条目信息卡 */
.entry-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.entry-card {
  display: flex;
  flex-direction: column;
  border: 1px solid #dadce0;
  border-radius: 4px;
  overflow: hidden;
  background-color: #ffffff;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.entry-card:hover {
  border-color: #1a5fb4;
  background-color: #f8f9fb;
}

.entry-cover {
  margin: 0;
  background-color: #f4f5f7;
  border-bottom: 1px solid #dadce0;
}

.entry-cover img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.entry-title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: #202124;
  padding: 12px 14px 0;
}

.entry-meta {
  padding: 8px 14px 14px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 10px;
  font-size: 13px;
  line-height: 1.6;
}

.entry-meta dt {
  color: #5f6368;
  white-space: nowrap;
}

.entry-meta dd {
  color: #3c4043;
  margin: 0;
}

/* 专题片单导览 */
.topics-figure {
  margin: 0 0 20px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  overflow: hidden;
  background-color: #f4f5f7;
}

.topics-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.topic-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.topic-item {
  border: 1px solid #dadce0;
  border-radius: 4px;
  padding: 16px;
  background-color: #ffffff;
}

.topic-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.topic-name a {
  color: #1a5fb4;
}

.topic-lead {
  font-size: 14px;
  color: #5f6368;
  line-height: 1.7;
  margin-bottom: 12px;
}

.topic-timeline {
  counter-reset: topicnode;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.topic-timeline li {
  position: relative;
  padding-left: 30px;
  font-size: 14px;
  line-height: 1.6;
  color: #3c4043;
  counter-increment: topicnode;
}

.topic-timeline li::before {
  content: counter(topicnode);
  position: absolute;
  left: 0;
  top: 1px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: #f4f5f7;
  border: 1px solid #dadce0;
  color: #1a5fb4;
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

/* 观看前四项确认 */
.precheck-list {
  counter-reset: precheck;
}

.precheck-step {
  position: relative;
  padding: 14px 16px 14px 52px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  background-color: #ffffff;
  counter-increment: precheck;
}

.precheck-step::before {
  content: counter(precheck);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: #1a5fb4;
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.precheck-step h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.precheck-step p {
  font-size: 15px;
  color: #3c4043;
  line-height: 1.7;
}

/* 术语摘录 */
.term-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}

.term-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  background-color: #ffffff;
}

.term-name {
  font-size: 15px;
  font-weight: 600;
  color: #1a5fb4;
}

.term-ref {
  font-size: 13px;
  color: #5f6368;
  line-height: 1.6;
}

.term-ref a {
  color: #1a5fb4;
  text-decoration: underline;
  text-decoration-style: dashed;
  text-underline-offset: 3px;
}

/* 页面分工 */
.division-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.division-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 10px 14px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  font-size: 15px;
  line-height: 1.7;
}

.division-list a {
  font-weight: 600;
  color: #1a5fb4;
}

.division-list span {
  color: #5f6368;
  font-size: 14px;
}

/* ============================================================
   pages：内页通用
   ============================================================ */
.basis-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.basis-item {
  border: 1px solid #dadce0;
  border-radius: 4px;
  padding: 14px;
  background-color: #ffffff;
}

.basis-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 6px;
}

.basis-item p {
  font-size: 14px;
  color: #3c4043;
  line-height: 1.7;
}

/* 误区列表 */
.misconception-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

.misconception-item {
  padding: 14px 16px;
  border: 1px solid #dadce0;
  border-left: 3px solid #dadce0;
  border-radius: 4px;
  background-color: #ffffff;
}

.misconception-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 4px;
}

.misconception-item p {
  font-size: 14px;
  color: #3c4043;
  line-height: 1.7;
}

/* 专题页 */
.topic-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 16px;
}

.topic-list .topic-item {
  padding: 18px;
}

.topic-intro {
  font-size: 15px;
  color: #3c4043;
  line-height: 1.7;
  margin-bottom: 10px;
}

.topic-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  font-size: 13px;
  color: #5f6368;
  margin-bottom: 12px;
}

.topic-meta dt {
  display: inline;
  font-weight: 600;
  color: #3c4043;
}

.topic-meta dd {
  display: inline;
  margin: 0 0 0 4px;
}

.topic-nodes {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

.topic-nodes .node-item {
  position: relative;
  padding-left: 34px;
  font-size: 14px;
  line-height: 1.7;
  color: #3c4043;
}

.topic-nodes .node-index {
  position: absolute;
  left: 0;
  top: 2px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: #f4f5f7;
  border: 1px solid #dadce0;
  color: #1a5fb4;
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.topic-link {
  font-size: 14px;
}

.topic-link a {
  color: #1a5fb4;
}

.reading-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.reading-card {
  border: 1px solid #dadce0;
  border-radius: 4px;
  padding: 14px;
  background-color: #ffffff;
}

.reading-card h3 {
  font-size: 15px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 6px;
}

.reading-card p {
  font-size: 14px;
  color: #3c4043;
  line-height: 1.7;
}

.materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 16px;
}

.materials-col h3 {
  font-size: 16px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 10px;
}

.material-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.material-item {
  padding: 10px 14px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  background-color: #ffffff;
}

.material-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: #202124;
  line-height: 1.5;
}

.material-use {
  display: block;
  font-size: 13px;
  color: #5f6368;
  line-height: 1.6;
}

/* 观看指南 */
.prep-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 16px;
}

.prep-col h3 {
  font-size: 16px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 10px;
}

/* 术语索引 */
.initial-index {
  margin: 16px 0;
  overflow-x: auto;
}

.initial-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.initial-list li {
  min-width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #dadce0;
  border-radius: 4px;
  background-color: #f4f5f7;
  font-size: 14px;
  color: #3c4043;
}

.initial-list a {
  color: #1a5fb4;
}

.term-table .term-row th {
  font-weight: 600;
  color: #202124;
  white-space: nowrap;
}

.compare-item {
  padding: 14px 16px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  background-color: #ffffff;
  margin-top: 12px;
}

.compare-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 6px;
}

.compare-item p {
  font-size: 14px;
  color: #3c4043;
  line-height: 1.7;
}

.mapping-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
}

.mapping-item {
  padding: 10px 14px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  font-size: 15px;
  line-height: 1.7;
  background-color: #ffffff;
}

.mapping-item a {
  color: #1a5fb4;
}

.read-next {
  margin-top: 32px;
}

/* 反馈页 */
.type-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.type-card {
  border: 1px solid #dadce0;
  border-radius: 4px;
  padding: 14px;
  background-color: #ffffff;
}

.type-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 6px;
}

.type-signal {
  font-size: 13px;
  color: #1a5fb4;
  font-weight: 600;
  margin-bottom: 6px;
}

.type-card p {
  font-size: 14px;
  color: #3c4043;
  line-height: 1.7;
}

.step-list {
  counter-reset: selfcheck;
}

.step-list .step-item {
  position: relative;
  padding-left: 46px;
  counter-increment: selfcheck;
}

.step-list .step-item .step-num {
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: #1a5fb4;
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.step-body {
  font-size: 15px;
  color: #3c4043;
  line-height: 1.7;
}

.process-list {
  counter-reset: processorder;
}

.process-item {
  position: relative;
  padding: 14px 16px 14px 52px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  background-color: #ffffff;
  counter-increment: processorder;
}

.process-item::before {
  content: counter(processorder);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: #f4f5f7;
  border: 1px solid #dadce0;
  color: #1a5fb4;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.process-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.process-item p {
  font-size: 15px;
  color: #3c4043;
  line-height: 1.7;
}

/* FAQ 折叠 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.faq-item {
  border: 1px solid #dadce0;
  border-radius: 4px;
  background-color: #ffffff;
  overflow: hidden;
}

.faq-item summary {
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 600;
  color: #202124;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: #1a5fb4;
  line-height: 1;
}

.faq-item[open] summary::after {
  content: "\2212";
}

.faq-item summary:hover {
  background-color: #f4f5f7;
}

.faq-body {
  padding: 0 16px 14px;
  border-top: 1px solid #dadce0;
  font-size: 15px;
  color: #3c4043;
  line-height: 1.75;
  padding-top: 12px;
}

/* 关于本站 */
.dual-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 16px;
}

.panel {
  border: 1px solid #dadce0;
  border-radius: 4px;
  padding: 16px;
  background-color: #ffffff;
}

.panel h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}

.panel-do h3 {
  color: #1a5fb4;
}

.panel-dont h3 {
  color: #c5221f;
}

.panel-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.panel-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: #3c4043;
  line-height: 1.7;
}

.panel-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #dadce0;
}

.panel-do .panel-list li::before {
  background-color: #1a5fb4;
}

.panel-dont .panel-list li::before {
  background-color: #c5221f;
}

.boundary-note {
  margin-top: 24px;
  padding: 14px 18px;
  background-color: #fbe9e7;
  border-left: 3px solid #c5221f;
  border-radius: 4px;
}

.boundary-title {
  font-size: 15px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 6px;
}

.boundary-note p {
  font-size: 14px;
  color: #5f6368;
  line-height: 1.7;
}

.layer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.layer-item {
  border: 1px solid #dadce0;
  border-radius: 4px;
  padding: 14px;
  background-color: #ffffff;
}

.layer-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 6px;
}

.layer-item p {
  font-size: 14px;
  color: #3c4043;
  line-height: 1.7;
}

.layer-link {
  margin-top: 8px;
  font-size: 14px;
}

.layer-link a {
  color: #1a5fb4;
}

.section-source .check-list {
  margin-top: 12px;
  margin-bottom: 14px;
}

/* ============================================================
   pages：404
   ============================================================ */
.error-main {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px 56px;
}

.error-inner {
  margin-top: 24px;
}

.error-panel {
  margin-top: 24px;
  padding: 28px 24px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  background-color: #f4f5f7;
}

.error-code {
  font-size: 13px;
  font-weight: 600;
  color: #5f6368;
  margin-bottom: 6px;
}

.error-panel h1 {
  font-size: 26px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 12px;
}

.error-lead {
  font-size: 16px;
  color: #3c4043;
  line-height: 1.75;
  margin-bottom: 16px;
}

.error-reasons {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.error-reasons li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  color: #3c4043;
  line-height: 1.7;
}

.error-reasons li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #9aa0a6;
}

.error-back {
  font-size: 15px;
}

.error-home-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 20px;
  background-color: #1a5fb4;
  color: #ffffff;
  border-radius: 4px;
  font-weight: 600;
}

.error-home-link:hover {
  background-color: #0b57d0;
  color: #ffffff;
  text-decoration: none;
}

.error-entries {
  margin-top: 32px;
}

.error-entries h2 {
  font-size: 18px;
  font-weight: 600;
  color: #202124;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #dadce0;
}

.error-entry-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.error-entry-list li {
  padding: 10px 14px;
  border: 1px solid #dadce0;
  border-radius: 4px;
  font-size: 15px;
  line-height: 1.7;
}

.error-entry-list a {
  color: #1a5fb4;
}

/* 页脚关于栏（存在时） */
.footer-about {
  font-size: 13px;
  color: #5f6368;
  line-height: 1.7;
}

/* ============================================================
   responsive：断点 1080 / 860 / 560
   ============================================================ */
@media (max-width: 1080px) {
  .page-layout {
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 28px;
  }

  .hero-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 28px;
  }

  .footer-inner {
    gap: 24px;
  }
}

@media (max-width: 860px) {
  .header-inner {
    padding: 0 20px;
    min-height: 56px;
    gap: 12px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .primary-nav {
    flex-basis: 100%;
    margin-left: 0;
    order: 3;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 4px 0 12px;
    border-top: 1px solid #dadce0;
  }

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

  .nav-list li {
    width: 100%;
  }

  .nav-list a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 10px 4px;
    border-bottom: 1px solid #f1f3f4;
    font-size: 15px;
  }

  .nav-list a.is-current {
    border-bottom-color: #f1f3f4;
    border-left: 3px solid #1a5fb4;
    padding-left: 10px;
  }

  .home-main,
  .inner-main {
    padding: 0 20px 44px;
  }

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

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

  .hero-index {
    order: 2;
  }

  .hero-main {
    order: 1;
  }

  .hero-index-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .hero-index-list li {
    flex: 1 1 200px;
  }

  .hero-index-list li a {
    border: 1px solid #dadce0;
    background-color: #ffffff;
    border-left-width: 2px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 28px 20px 20px;
    gap: 24px;
  }

  .footer-bottom {
    padding: 14px 20px 24px;
  }

  .error-main {
    padding: 0 20px 44px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }

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

  .brand {
    font-size: 16px;
  }

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

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

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

  .content-section > h2,
  .section-block > h2,
  .section > h2,
  .channels-overview > h2,
  .entry-cards > h2,
  .topics-overview > h2,
  .precheck > h2,
  .terms-preview > h2,
  .page-division > h2,
  .read-next > h2,
  .read-more > h2 {
    font-size: 18px;
  }

  .version-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-layout {
    margin-top: 24px;
  }

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

  .btn {
    width: 100%;
  }

  .channels-overview,
  .entry-cards,
  .topics-overview,
  .precheck,
  .terms-preview,
  .page-division {
    margin-top: 32px;
  }

  .topic-columns,
  .entry-card-grid,
  .term-list,
  .basis-grid,
  .reading-grid,
  .materials-grid,
  .prep-columns,
  .type-grid,
  .dual-panel,
  .layer-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .error-panel {
    padding: 22px 16px;
  }

  .error-panel h1 {
    font-size: 22px;
  }

  .division-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  .proof-bar {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .toc-list a {
    display: inline-block;
    min-height: 32px;
  }

  .initial-list {
    flex-wrap: nowrap;
  }
}