/* ==========================================================================
   base — 变量、重置、排版基础
   ========================================================================== */

:root {
  --ink: #12161c;
  --ink-soft: #2b323c;
  --paper: #f7f4ee;
  --paper-raised: #fffdf9;
  --cinnabar: #b23a2f;
  --cinnabar-deep: #8f2c23;
  --muted: #6b7280;
  --line: #d9d3c6;
  --line-strong: #c3bba9;

  --font-serif: "Songti SC", "SimSun", "Noto Serif CJK SC", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;

  --container: 1180px;
  --reading: 760px;
  --gutter: 24px;
  --header-h: 64px;
  --radius: 6px;
  --radius-sm: 4px;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

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

figure {
  margin: 0;
}

h1,
h2,
h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--ink);
  margin: 0;
  line-height: 1.3;
}

p {
  margin: 0 0 1em;
}

p:last-child {
  margin-bottom: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--ink);
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
}

button {
  font-family: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

.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;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius-sm);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 12px;
}

/* ==========================================================================
   layout — 容器、页头、全屏索引、正文骨架、页脚
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.site-main {
  display: block;
  padding-bottom: 72px;
}

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

/* 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(247, 244, 238, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(120%) blur(6px);
}

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

.brand-mark {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.04em;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.brand-mark:hover {
  color: var(--cinnabar);
}

.menu-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--paper-raised);
  font-size: 14px;
  color: var(--ink-soft);
}

.menu-toggle:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

.menu-toggle-label {
  letter-spacing: 0.08em;
}

.menu-toggle-bars {
  display: inline-block;
  width: 16px;
  height: 10px;
  border-top: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  position: relative;
}

.menu-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  margin-top: -0.75px;
  border-top: 1.5px solid currentColor;
}

/* 全屏栏目索引 */
.site-index {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: rgba(18, 22, 28, 0.55);
  padding: 0;
  overflow-y: auto;
}

.site-index[hidden] {
  display: none;
}

.site-index-panel {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
  min-height: 100%;
  background: var(--paper);
  padding: 56px 32px 48px;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.index-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--paper-raised);
  font-size: 0;
  line-height: 1;
}

.index-close::before,
.index-close::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 1.5px;
  background: var(--ink);
  transform-origin: center;
}

.index-close::before {
  transform: translate(-50%, -50%) rotate(45deg);
}

.index-close::after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.index-close:hover {
  border-color: var(--cinnabar);
}

.index-close:hover::before,
.index-close:hover::after {
  background: var(--cinnabar);
}

.index-eyebrow {
  margin: 0 0 20px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.index-list {
  display: flex;
  flex-direction: column;
}

.index-list li {
  border-top: 1px solid var(--line);
}

.index-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.index-list a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
  min-height: 56px;
  padding: 12px 4px;
  transition: background-color 0.15s ease;
}

.index-list a:hover {
  background: rgba(178, 58, 47, 0.06);
}

.index-list a.is-current .index-name {
  color: var(--cinnabar);
}

.index-list a.is-current .index-name::after {
  content: "·当前";
  margin-left: 8px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cinnabar);
}

.index-name {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
}

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

/* 阅读进度线 */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 160;
  background: transparent;
  pointer-events: none;
}

.reading-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--cinnabar);
  transition: width 0.1s linear;
}

/* 内页骨架：面包屑与标题区 */
.breadcrumb {
  max-width: var(--container);
  margin: 0 auto;
  padding: 20px var(--gutter) 0;
  font-size: 13px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: var(--line-strong);
}

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

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

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

.page-header {
  max-width: var(--container);
  margin: 0 auto;
  padding: 12px var(--gutter) 0;
}

.page-title {
  font-size: 40px;
  line-height: 1.25;
  font-weight: 700;
  color: var(--ink);
}

/* 页脚 */
.site-footer {
  background: var(--ink);
  color: #d8d3c8;
  padding: 56px 0 0;
  font-size: 14px;
  line-height: 1.8;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1.1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(217, 211, 198, 0.22);
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: #f7f4ee;
  margin: 0 0 12px;
}

.footer-intro {
  color: #b6b1a6;
  margin: 0;
}

.footer-heading {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #948f84;
  margin: 0 0 14px;
}

.footer-nav .footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}

.footer-links a {
  color: #d8d3c8;
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: transparent;
}

.footer-links a:hover {
  color: #fff;
  text-decoration-color: var(--cinnabar);
}

.footer-col p {
  margin: 0 0 10px;
  color: #b6b1a6;
}

.footer-col p:last-child {
  margin-bottom: 0;
}

.footer-bottom {
  padding: 20px 0 28px;
}

.footer-bottom p {
  margin: 0;
  font-size: 13px;
  color: #918c81;
}

/* ==========================================================================
   components — 通用文字块、链接、按钮、表格、折叠、图片容器
   ========================================================================== */

.section-eyebrow,
.page-eyebrow,
.section-intro,
.section-sub,
.section-lead {
  color: var(--muted);
}

.section-eyebrow,
.page-eyebrow {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 14px;
}

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

.section-head h2 {
  font-size: 28px;
  margin-bottom: 10px;
}

.section-sub {
  font-size: 15px;
  margin: 0;
  max-width: 62ch;
}

.section-intro {
  font-size: 15px;
  margin: 0 0 20px;
  max-width: 68ch;
}

.section-lead {
  font-size: 15px;
  margin: 0 0 20px;
  max-width: 68ch;
}

.section-title {
  font-size: 26px;
  margin: 0 0 12px;
}

.section-note {
  font-size: 14px;
  color: var(--muted);
  margin: 16px 0 0;
}

.section-more {
  margin: 28px 0 0;
}

.link-inline,
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  font-size: 14px;
  color: var(--cinnabar);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: rgba(178, 58, 47, 0.4);
}

.link-inline::after,
.text-link::after {
  content: "→";
  font-size: 13px;
  transition: transform 0.15s ease;
}

.link-inline:hover,
.text-link:hover {
  color: var(--cinnabar-deep);
  text-decoration-color: var(--cinnabar-deep);
}

.link-inline:hover::after,
.text-link:hover::after {
  transform: translateX(3px);
}

.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

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

.btn-primary:hover {
  background: var(--cinnabar-deep);
}

.btn-ghost {
  border: 1px solid var(--line-strong);
  color: var(--ink);
  background: var(--paper-raised);
}

.btn-ghost:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 14px;
}

.tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cinnabar);
  border: 1px solid rgba(178, 58, 47, 0.35);
  border-radius: 999px;
}

.issue-no {
  font-family: var(--font-sans);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* 图片与图注通用约束 */
figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--line);
}

figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* 表格通用 */
.table-wrap,
.table-scroll {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
}

.channel-table,
.data-table {
  min-width: 640px;
  font-size: 14px;
  line-height: 1.65;
}

.channel-table thead th,
.data-table thead th {
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: #efeae0;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-strong);
  white-space: nowrap;
}

.channel-table tbody td,
.data-table tbody td {
  padding: 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  color: var(--ink-soft);
}

.channel-table tbody tr:last-child td,
.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.channel-table tbody tr {
  transition: background-color 0.15s ease;
}

.channel-table tbody tr:hover {
  background: rgba(178, 58, 47, 0.05);
}

.channel-table tbody th {
  text-align: left;
  font-weight: 600;
  color: var(--ink);
  padding: 14px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.channel-table tbody tr:last-child th {
  border-bottom: 0;
}

/* 折叠问答通用 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}

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

.faq-item summary {
  position: relative;
  display: block;
  padding: 18px 44px 18px 4px;
  min-height: 44px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--cinnabar);
  line-height: 1;
}

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

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

.faq-answer {
  padding: 0 4px 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.faq-answer p {
  margin: 0 0 10px;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* 字段说明列表 */
.field-list {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.field-list dt {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  padding: 16px 0 4px;
  border-top: 1px solid var(--line);
}

.field-list dt:first-of-type {
  border-top: 0;
  padding-top: 4px;
}

.field-list dd {
  margin: 0 0 16px;
  font-size: 15px;
  color: var(--ink-soft);
}

/* 步骤列表（内页通用） */
.step-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
  counter-reset: step;
}

.step-list li {
  position: relative;
  padding-left: 44px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.step-list li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--cinnabar);
  border: 1px solid rgba(178, 58, 47, 0.4);
  border-radius: 50%;
}

.step-list li strong {
  color: var(--ink);
}

/* 相关内容横条 */
.related-links {
  max-width: var(--container);
  margin: 48px auto 0;
  padding: 18px var(--gutter) 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
}

.related-links-label {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.related-links-item {
  font-size: 14px;
  color: var(--ink-soft);
  min-height: 32px;
  display: inline-flex;
  align-items: center;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: var(--line-strong);
}

.related-links-item:hover {
  color: var(--cinnabar);
  text-decoration-color: var(--cinnabar);
}

/* ==========================================================================
   pages — 首页
   ========================================================================== */

/* 编辑部头条区 */
.lead-section {
  padding: 40px 0 56px;
  border-bottom: 1px solid var(--line);
}

.lead-feature {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.lead-cover {
  position: relative;
  margin: 0;
}

.lead-cover img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

.cover-caption {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}

.lead-text {
  padding-top: 4px;
  min-width: 0;
}

.lead-text h1 {
  font-size: 38px;
  line-height: 1.28;
  margin: 0 0 18px;
}

.lead-summary {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 26px;
  max-width: 38em;
}

/* 次要导览 */
.lead-secondary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.secondary-item {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  min-width: 0;
}

.secondary-media {
  margin: 0;
}

.secondary-media img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

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

.secondary-title {
  font-size: 19px;
  line-height: 1.45;
  margin: 0 0 8px;
}

.secondary-body p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0 0 10px;
}

/* 任务分组三栏 */
.task-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.task-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
}

.task-col {
  padding: 24px 28px 8px 0;
  border-right: 1px solid var(--line);
  min-width: 0;
}

.task-col:last-child {
  border-right: 0;
  padding-right: 0;
}

.task-col + .task-col {
  padding-left: 28px;
}

.task-index {
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cinnabar);
  margin: 0 0 10px;
}

.task-name {
  font-size: 20px;
  margin: 0 0 12px;
  line-height: 1.4;
}

.task-scene {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

/* 频道索引预览 */
.channel-preview {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.channel-figure {
  margin: 0 0 28px;
}

.channel-figure img {
  width: 100%;
  aspect-ratio: 21 / 8;
  object-fit: cover;
  border-radius: var(--radius);
}

/* 专题片单预览 */
.topic-preview {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.topic-item {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.topic-item:last-of-type {
  border-bottom: 1px solid var(--line);
}

.topic-cover {
  margin: 0;
}

.topic-cover img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.topic-cover figcaption {
  margin-top: 8px;
}

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

.topic-title {
  font-size: 22px;
  line-height: 1.4;
  margin: 0 0 10px;
}

.topic-scope {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 12px;
}

.topic-progress {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 8px;
}

.progress-value {
  font-variant-numeric: tabular-nums;
  color: var(--cinnabar);
  font-weight: 600;
}

.topic-channels {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 12px;
}

/* 观看指南三步条 */
.steps-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  counter-reset: none;
}

.step-col {
  position: relative;
  padding: 24px 22px 20px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.step-no {
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cinnabar);
  margin: 0 0 10px;
}

.step-name {
  font-size: 19px;
  margin: 0 0 10px;
  line-height: 1.4;
}

.step-action {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

/* 入口核验清单预览 */
.check-preview {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.check-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.check-list {
  border-top: 1px solid var(--line);
}

.check-list li {
  position: relative;
  padding: 14px 0 14px 32px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 22px;
  width: 12px;
  height: 12px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
}

.check-aside {
  padding: 24px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.aside-title {
  font-size: 18px;
  margin: 0 0 12px;
  line-height: 1.4;
}

.check-aside p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 12px;
}

/* 首页 FAQ */
.faq-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

/* 编辑说明摘要条 */
.about-strip {
  padding: 40px 0;
}

.about-strip-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 32px;
  padding: 24px 28px;
  background: var(--ink);
  border-radius: var(--radius);
}

.about-strip-inner p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.6;
  color: #f0ece3;
  max-width: 62ch;
}

.about-strip-inner .link-inline {
  color: #f0ece3;
  text-decoration-color: rgba(240, 236, 227, 0.45);
}

.about-strip-inner .link-inline:hover {
  color: #fff;
  text-decoration-color: var(--cinnabar);
}

/* ==========================================================================
   pages — 频道索引
   ========================================================================== */

.page-title-block {
  padding: 20px 0 32px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.page-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 68ch;
  margin: 0;
}

.page-figure {
  margin: 0 0 40px;
}

.page-figure img {
  width: 100%;
  aspect-ratio: 21 / 8;
  object-fit: cover;
  border-radius: var(--radius);
}

.usage-order {
  margin-bottom: 48px;
}

.usage-order h2 {
  font-size: 26px;
  margin: 0 0 12px;
}

.usage-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 20px;
  list-style: none;
  counter-reset: usage;
}

.usage-steps li {
  position: relative;
  padding: 18px 18px 18px 18px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  min-width: 0;
}

.usage-steps li strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--ink);
}

.channel-table-block {
  margin-bottom: 48px;
}

.channel-table-block h2 {
  font-size: 26px;
  margin: 0 0 12px;
}

.field-notes {
  margin-bottom: 48px;
  max-width: var(--reading);
}

.field-notes h2 {
  font-size: 26px;
  margin: 0 0 12px;
}

.related-topics {
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.related-topics h2 {
  font-size: 24px;
  margin: 0 0 12px;
}

.related-entries {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 8px;
}

.related-entry {
  padding: 22px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.related-entry h3 {
  font-size: 18px;
  margin: 0 0 8px;
  line-height: 1.45;
}

.related-entry p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 12px;
}

/* ==========================================================================
   pages — 专题片单
   ========================================================================== */

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

.topic-anchor-bar {
  margin-bottom: 40px;
}

.topic-anchor-list {
  display: flex;
  flex-wrap: nowrap;
  gap: 12px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 6px;
}

.topic-anchor-list li {
  flex: 0 0 auto;
}

.topic-anchor-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  min-height: 44px;
  padding: 8px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--paper-raised);
  transition: border-color 0.15s ease, color 0.15s ease;
}

.topic-anchor-list a:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

.topic-anchor-no {
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cinnabar);
}

.topic-anchor-name {
  font-size: 14px;
  color: inherit;
}

.topic-entry {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  padding: 32px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.topic-entry:last-of-type {
  border-bottom: 1px solid var(--line);
}

.topic-entry .topic-cover img {
  aspect-ratio: 3 / 4;
}

.topic-cover-cap {
  margin-top: 8px;
}

.topic-entry .topic-body {
  min-width: 0;
}

.topic-no {
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cinnabar);
  margin: 0 0 8px;
}

.topic-entry .topic-title {
  font-size: 24px;
  margin: 0 0 12px;
}

.topic-summary {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

.topic-channel {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 14px;
}

.topic-channel a {
  color: var(--cinnabar);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: rgba(178, 58, 47, 0.4);
  margin-right: 4px;
}

.topic-channel a:hover {
  color: var(--cinnabar-deep);
  text-decoration-color: var(--cinnabar-deep);
}

.topic-items {
  list-style: none;
  counter-reset: item;
  border-top: 1px solid var(--line);
  margin: 0 0 14px;
}

.topic-items li {
  position: relative;
  padding: 10px 0 10px 34px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.topic-items li::before {
  counter-increment: item;
  content: counter(item, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 10px;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}

.topic-entry .topic-progress {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}

.reading-notes {
  padding: 48px 0 0;
}

.reading-notes h2 {
  font-size: 26px;
  margin: 0 0 24px;
}

.reading-notes-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.reading-notes-col {
  min-width: 0;
}

.reading-notes-col h3 {
  font-size: 18px;
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.note-list {
  list-style: none;
}

.note-list li {
  position: relative;
  padding: 8px 0 8px 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 6px;
  height: 1px;
  background: var(--cinnabar);
}

.related-channels,
.guide-entry {
  padding: 40px 0 0;
}

.related-channels h2,
.guide-entry h2 {
  font-size: 24px;
  margin: 0 0 12px;
}

.related-channel-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 8px;
}

.related-channel-list li {
  padding: 16px 18px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.related-channel-list a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: var(--line-strong);
}

.related-channel-list a:hover {
  color: var(--cinnabar);
  text-decoration-color: var(--cinnabar);
}

.related-channel-desc {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.guide-entry-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 8px;
}

.guide-entry-list li {
  min-width: 0;
}

.guide-entry-list a {
  display: flex;
  align-items: center;
  min-height: 52px;
  padding: 12px 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper-raised);
  font-size: 15px;
  color: var(--ink);
  transition: border-color 0.15s ease, color 0.15s ease;
}

.guide-entry-list a:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

/* ==========================================================================
   pages — 观看指南（主栏 + 侧栏）
   ========================================================================== */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 48px;
  align-items: start;
  padding-top: 32px;
}

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

.page-aside {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: calc(var(--header-h) + 20px);
}

.content-section {
  margin-bottom: 44px;
}

.content-section h2 {
  font-size: 26px;
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.content-section > p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 38em;
}

.guide-section {
  margin-bottom: 44px;
}

.guide-section h2 {
  font-size: 26px;
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.guide-figure {
  margin: 0 0 28px;
}

.guide-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
}

.step-item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 18px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  align-items: start;
}

.step-item:last-child {
  border-bottom: 1px solid var(--line);
}

.step-marker {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border: 1px solid rgba(178, 58, 47, 0.4);
  border-radius: 50%;
  font-family: var(--font-serif);
  font-size: 18px;
  font-variant-numeric: tabular-nums;
  color: var(--cinnabar);
}

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

.step-title {
  font-size: 18px;
  margin: 0 0 8px;
  line-height: 1.45;
}

.step-body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 8px;
}

.step-check {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}

.judge-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}

.judge-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.judge-title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 8px;
  line-height: 1.5;
}

.judge-item p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 8px;
}

.judge-meta {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}

.table-caption {
  caption-side: top;
  text-align: left;
  font-size: 13px;
  color: var(--muted);
  padding: 0 0 10px;
}

.record-table {
  min-width: 560px;
}

.aside-block {
  padding: 22px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.aside-heading {
  font-size: 17px;
  margin: 0 0 12px;
  line-height: 1.45;
}

.aside-block p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.aside-block p:last-child {
  margin-bottom: 0;
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 12px;
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.aside-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: 14px;
  color: var(--cinnabar);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: rgba(178, 58, 47, 0.35);
}

.aside-links a:hover {
  color: var(--cinnabar-deep);
  text-decoration-color: var(--cinnabar-deep);
}

.aside-note {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

/* ==========================================================================
   pages — 入口核验
   ========================================================================== */

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

.page-title-section .page-lead {
  margin: 0;
}

.entry-check-main .content-section > p {
  max-width: 38em;
}

.content-figure {
  margin: 24px 0 28px;
}

.content-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
}

.scope-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 8px;
}

.scope-col {
  padding: 20px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.scope-col h3 {
  font-size: 16px;
  margin: 0 0 10px;
  line-height: 1.5;
}

.scope-col p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 8px;
}

.scope-col p:last-child {
  margin-bottom: 0;
}

.scope-col ul {
  list-style: none;
}

.scope-col li {
  position: relative;
  padding: 4px 0 4px 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.scope-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 1px;
  background: var(--cinnabar);
}

.check-table {
  min-width: 680px;
}

.table-note {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  margin: 12px 0 0;
}

.field-item {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.field-item:first-child {
  border-top: 0;
}

.field-item dt {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
  padding: 0;
  border: 0;
}

.field-item dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.plain-list {
  list-style: none;
}

.plain-list li {
  position: relative;
  padding: 6px 0 6px 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 6px;
  height: 1px;
  background: var(--cinnabar);
}

.entry-check-aside .aside-block p {
  max-width: none;
}

/* ==========================================================================
   pages — 常见问题
   ========================================================================== */

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

.page-lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 68ch;
  margin: 0;
}

.faq-figure {
  margin: 0 0 40px;
}

.faq-figure img {
  width: 100%;
  aspect-ratio: 21 / 8;
  object-fit: cover;
  border-radius: var(--radius);
}

.figure-caption {
  margin-top: 10px;
}

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

.faq-group-head {
  margin-bottom: 8px;
}

.faq-group-head h2 {
  font-size: 24px;
  margin: 0 0 8px;
}

.faq-group-head p {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
  max-width: 62ch;
}

.faq-exits {
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.faq-exits h2 {
  font-size: 24px;
  margin: 0 0 20px;
}

.exit-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.exit-item {
  min-width: 0;
}

.exit-item a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 44px;
  padding: 18px 20px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.15s ease;
}

.exit-item a:hover {
  border-color: var(--cinnabar);
}

.exit-name {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.45;
}

.exit-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ==========================================================================
   pages — 编辑说明
   ========================================================================== */

.about-body {
  max-width: 820px;
}

.about-cover {
  margin: 0 0 40px;
}

.about-cover img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
}

.about-section {
  margin-bottom: 44px;
}

.about-section h2 {
  font-size: 26px;
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.about-section > p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 38em;
  margin: 0 0 16px;
}

.boundary-list {
  list-style: none;
  border-top: 1px solid var(--line);
}

.boundary-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.boundary-name {
  display: inline-block;
  min-width: 6em;
  margin-right: 12px;
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--ink);
}

.structure-item {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.structure-item:last-of-type {
  border-bottom: 1px solid var(--line);
}

.structure-item h3 {
  font-size: 18px;
  margin: 0 0 8px;
  line-height: 1.45;
}

.structure-item p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.image-note {
  padding: 16px 20px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 16px;
}

.image-note h3 {
  font-size: 16px;
  margin: 0 0 6px;
  line-height: 1.5;
}

.image-note p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.about-inline-figure {
  margin: 24px 0 0;
}

.about-inline-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
}

.correction-steps {
  list-style: none;
  counter-reset: none;
}

.correction-steps li {
  position: relative;
  padding: 16px 0 16px 52px;
  border-top: 1px solid var(--line);
}

.correction-steps li:last-child {
  border-bottom: 1px solid var(--line);
}

.step-index {
  position: absolute;
  left: 0;
  top: 18px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--cinnabar);
  border: 1px solid rgba(178, 58, 47, 0.4);
  border-radius: 50%;
}

.correction-steps h3 {
  font-size: 17px;
  margin: 0 0 6px;
  line-height: 1.45;
}

.correction-steps p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.about-more {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
}

/* ==========================================================================
   pages — 404
   ========================================================================== */

.error-main {
  padding-top: 72px;
}

.error-wrap {
  max-width: 720px;
}

.error-main h1 {
  font-size: 40px;
  line-height: 1.3;
  margin: 0 0 16px;
}

.error-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 28px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 44px;
}

.error-section {
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.error-section h2 {
  font-size: 22px;
  margin: 0 0 16px;
}

.error-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.error-list li {
  min-width: 0;
}

.error-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper-raised);
  font-size: 14px;
  color: var(--ink);
  transition: border-color 0.15s ease, color 0.15s ease;
}

.error-list a:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

.error-note {
  margin-top: 32px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.error-note a {
  color: var(--cinnabar);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: rgba(178, 58, 47, 0.4);
}

.error-note a:hover {
  color: var(--cinnabar-deep);
  text-decoration-color: var(--cinnabar-deep);
}

/* ==========================================================================
   responsive — 1024 / 768 / 480
   ========================================================================== */

@media (max-width: 1024px) {
  .lead-feature {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
  }

  .lead-text h1 {
    font-size: 32px;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 32px;
  }

  .topic-entry {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 24px;
  }

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

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
  }

  .site-main {
    padding-bottom: 56px;
  }

  .page-title {
    font-size: 28px;
    line-height: 1.3;
  }

  .lead-section {
    padding: 28px 0 40px;
  }

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

  .lead-text h1 {
    font-size: 28px;
    line-height: 1.32;
  }

  .lead-summary {
    font-size: 15px;
    margin-bottom: 20px;
  }

  .lead-secondary {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    margin-top: 28px;
    padding-top: 24px;
  }

  .secondary-item {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 16px;
  }

  .task-section,
  .channel-preview,
  .topic-preview,
  .steps-section,
  .check-preview,
  .faq-section {
    padding: 40px 0;
  }

  .section-head h2 {
    font-size: 23px;
  }

  .task-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .task-col {
    padding: 20px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .task-col + .task-col {
    padding-left: 0;
  }

  .task-col:last-child {
    border-bottom: 0;
  }

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

  .topic-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    padding: 24px 0;
  }

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

  .steps-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

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

  .about-strip-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 22px;
  }

  .about-strip-inner p {
    font-size: 16px;
  }

  .page-title-block,
  .page-head,
  .page-hero,
  .page-title-section {
    padding: 16px 0 24px;
    margin-bottom: 28px;
  }

  .page-title-section {
    margin-bottom: 0;
  }

  .page-lead,
  .page-lede {
    font-size: 15px;
  }

  .page-figure,
  .faq-figure {
    margin-bottom: 28px;
  }

  .page-figure img,
  .faq-figure img {
    aspect-ratio: 16 / 9;
  }

  .usage-order,
  .channel-table-block,
  .field-notes {
    margin-bottom: 36px;
  }

  .usage-order h2,
  .channel-table-block h2,
  .field-notes h2,
  .reading-notes h2,
  .about-section h2,
  .content-section h2,
  .guide-section h2 {
    font-size: 22px;
  }

  .usage-steps {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .related-entries {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .topic-anchor-bar {
    margin-bottom: 28px;
  }

  .topic-entry {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
    padding: 24px 0;
  }

  .topic-entry .topic-cover img {
    aspect-ratio: 16 / 9;
  }

  .topic-entry .topic-title {
    font-size: 21px;
  }

  .reading-notes {
    padding-top: 36px;
  }

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

  .related-channel-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .guide-entry-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding-top: 24px;
  }

  .page-aside {
    position: static;
    top: auto;
    gap: 16px;
  }

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

  .step-item {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 14px;
    padding: 16px 0;
  }

  .step-marker {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }

  .scope-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .channel-table,
  .data-table,
  .record-table,
  .check-table {
    min-width: 0;
  }

  /* 表格转纵向条目，字段名在左 */
  .channel-table thead,
  .data-table thead {
    display: none;
  }

  .channel-table tbody,
  .channel-table tr,
  .channel-table th,
  .channel-table td,
  .data-table tbody,
  .data-table tr,
  .data-table td {
    display: block;
    width: 100%;
  }

  .channel-table tbody tr,
  .data-table tbody tr {
    padding: 14px 16px;
    border-bottom: 1px solid var(--line);
  }

  .channel-table tbody tr:last-child,
  .data-table tbody tr:last-child {
    border-bottom: 0;
  }

  .channel-table tbody th,
  .channel-table tbody td,
  .data-table tbody td {
    padding: 0 0 10px;
    border: 0;
    font-size: 14px;
    line-height: 1.7;
    white-space: normal;
    overflow-wrap: anywhere;
  }

  .channel-table tbody th {
    font-family: var(--font-serif);
    font-size: 17px;
    padding-bottom: 8px;
  }

  .channel-table tbody td::before,
  .data-table tbody td::before {
    display: block;
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 2px;
  }

  .channel-table tbody tr > *:last-child,
  .data-table tbody tr > *:last-child {
    padding-bottom: 0;
  }

  .field-list dt {
    font-size: 15px;
  }

  .field-list dd {
    font-size: 14px;
  }

  .about-body {
    max-width: 100%;
  }

  .about-cover {
    margin-bottom: 28px;
  }

  .about-cover img,
  .about-inline-figure img {
    aspect-ratio: 16 / 9;
  }

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

  .about-section > p {
    font-size: 15px;
  }

  .boundary-name {
    display: block;
    margin: 0 0 2px;
    min-width: 0;
  }

  .correction-steps li {
    padding: 14px 0 14px 46px;
  }

  .step-index {
    width: 28px;
    height: 28px;
    top: 16px;
  }

  .exit-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .faq-group {
    margin-bottom: 32px;
  }

  .faq-group-head h2,
  .faq-exits h2 {
    font-size: 21px;
  }

  .faq-item summary {
    font-size: 16px;
    padding: 16px 40px 16px 2px;
  }

  .faq-answer {
    font-size: 14px;
    padding: 0 2px 16px;
  }

  .related-links {
    margin-top: 36px;
    gap: 8px 16px;
  }

  .error-main {
    padding-top: 48px;
  }

  .error-main h1 {
    font-size: 30px;
  }

  .error-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding-bottom: 28px;
  }

  .site-footer {
    padding-top: 40px;
  }

  .footer-nav .footer-links {
    gap: 4px 16px;
  }

  .site-index-panel {
    padding: 56px 20px 40px;
    border-left: 0;
    border-right: 0;
  }

  .index-list a {
    min-height: 48px;
  }
}

@media (max-width: 480px) {
  :root {
    --gutter: 16px;
  }

  body {
    font-size: 15px;
  }

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

  .menu-toggle {
    padding: 0 10px;
    font-size: 13px;
  }

  .lead-text h1 {
    font-size: 25px;
  }

  .secondary-item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 14px;
  }

  .secondary-title {
    font-size: 17px;
  }

  .section-head h2 {
    font-size: 21px;
  }

  .step-col {
    padding: 20px 18px 16px;
  }

  .check-aside {
    padding: 20px;
  }

  .page-title {
    font-size: 25px;
  }

  .topic-entry .topic-title {
    font-size: 19px;
  }

  .about-strip-inner {
    padding: 18px;
  }

  .about-strip-inner p {
    font-size: 15px;
  }

  .step-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
  }

  .step-marker {
    width: 34px;
    height: 34px;
    font-size: 14px;
  }

  .step-title {
    font-size: 16px;
  }

  .aside-block {
    padding: 18px;
  }

  .error-main h1 {
    font-size: 26px;
  }
}

/* 程序验收反馈：移动端防溢出 */
@media (max-width: 768px) {
  .site-main,
  .site-main * {
    min-width: 0;
    max-width: 100%;
  }

  .site-main :is(h1, h2, h3, h4, p, a, span) {
    overflow-wrap: anywhere;
  }
}