/* ==========================================================================
   多瑙影视 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base：变量、重置、排版基线
   -------------------------------------------------------------------------- */
:root {
  --paper: #f7f4ee;
  --paper-sheet: #fffdf8;
  --ink: #1f2a35;
  --ink-soft: #5a6470;
  --ochre: #b4541f;
  --ochre-soft: #fbf0dd;
  --teal: #2f5d62;
  --rule: #ded6c8;
  --rule-strong: #c9bfae;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --shell: 1120px;
  --read: 760px;
  --rail: 220px;
  --gap: 32px;
}

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

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

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

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

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
}

a {
  color: var(--ochre);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease;
}

a:hover,
a:focus-visible {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

p {
  margin-bottom: 0;
}

h1, h2, h3 {
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

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

/* --------------------------------------------------------------------------
   layout：全站锁定骨架（页头 / 主容器 / 面包屑 / 页标题 / 页脚）
   -------------------------------------------------------------------------- */
.site-body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 页头 */
.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand-logo {
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.3;
  padding-left: 10px;
  border-left: 3px solid var(--ochre);
}

.brand-logo:hover,
.brand-logo:focus-visible {
  color: var(--ochre);
  text-decoration: none;
}

.brand-tagline {
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-soft);
  padding-left: 13px;
}

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

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

.nav-link {
  display: block;
  padding: 8px 11px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--ink);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--ochre);
  border-bottom-color: var(--rule-strong);
  text-decoration: none;
}

.nav-link.is-current {
  color: var(--ochre);
  border-bottom-color: var(--ochre);
  font-weight: 600;
}

/* 移动菜单按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  background: var(--paper-sheet);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
}

.mobile-menu {
  border-top: 1px solid var(--rule);
  background: var(--paper-sheet);
}

.mobile-menu[hidden] {
  display: none;
}

.mobile-nav-list {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 6px 0;
}

.mobile-nav-list li + li {
  border-top: 1px solid var(--rule);
}

.mobile-nav-list a {
  display: block;
  padding: 13px 24px;
  min-height: 48px;
  font-size: 15px;
  color: var(--ink);
}

.mobile-nav-list a:hover,
.mobile-nav-list a:focus-visible {
  background: var(--ochre-soft);
  color: var(--ochre);
  text-decoration: none;
}

/* 主容器 */
.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.home-main,
.inner-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 72px;
}

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

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

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--ochre);
}

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

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

/* 页面标题区 */
.page-header {
  padding: 18px 0 0;
}

.page-title {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
  padding-left: 14px;
  border-left: 4px solid var(--ochre);
}

.page-head,
.page-hero {
  padding: 16px 0 0;
  max-width: var(--read);
}

.page-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  margin-bottom: 10px;
}

.page-meta {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

/* 页脚 */
.site-footer {
  flex-shrink: 0;
  background: var(--paper-sheet);
  border-top: 1px solid var(--rule);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 40px 24px 28px;
  display: grid;
  grid-template-columns: minmax(220px, 1.4fr) repeat(3, minmax(140px, 1fr));
  gap: 32px;
}

.footer-brand {
  min-width: 0;
}

.footer-logo {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  padding-left: 10px;
  border-left: 3px solid var(--ochre);
  margin-bottom: 10px;
}

.footer-intro {
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 32em;
}

.footer-title {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}

.footer-links li + li {
  margin-top: 2px;
}

.footer-links a {
  display: block;
  padding: 5px 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--ochre);
}

.footer-bottom {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px 24px 28px;
  border-top: 1px solid var(--rule);
}

.footer-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.footer-copy {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   components：全站复用组件
   -------------------------------------------------------------------------- */

/* 区块标题 */
.section-title {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 14px;
}

.section-desc,
.section-intro {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 62em;
  margin-bottom: 20px;
}

.sub-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.module-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

/* 行内链接 */
.inline-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ochre);
  padding-bottom: 1px;
  border-bottom: 1px solid var(--rule-strong);
}

.inline-link:hover,
.inline-link:focus-visible {
  color: var(--teal);
  border-bottom-color: var(--teal);
  text-decoration: none;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  border-radius: 3px;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--ochre);
  color: #fffdf8;
  border-color: var(--ochre);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #9c4718;
  border-color: #9c4718;
  color: #fffdf8;
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule-strong);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  color: var(--ochre);
  border-color: var(--ochre);
  background: var(--ochre-soft);
  text-decoration: none;
}

/* 等宽标签 */
.mono-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--teal);
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 1px 8px;
  line-height: 1.7;
}

/* 折叠问答 */
.faq-item {
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: var(--paper-sheet);
}

.faq-item + .faq-item {
  margin-top: 8px;
}

.faq-question {
  display: block;
  padding: 13px 44px 13px 16px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  position: relative;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
  color: var(--ochre);
}

.faq-item[open] .faq-question::after {
  content: "–";
}

.faq-item[open] .faq-question {
  border-bottom: 1px solid var(--rule);
  color: var(--ochre);
}

.faq-answer {
  padding: 12px 16px 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.faq-answer p + p {
  margin-top: 8px;
}

/* 侧栏目录（题材索引 / 观看答疑） */
.sidebar {
  min-width: 0;
}

.sidebar-title {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule-strong);
  margin-bottom: 12px;
}

.sidebar-note {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 相关链接列表 */
.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
}

.related-link,
.related-links-item {
  font-size: 14px;
  font-weight: 600;
  color: var(--ochre);
}

.related-link-item,
.related-item {
  min-width: 0;
}

/* 图片容器通用约束 */
figure {
  min-width: 0;
}

figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: var(--paper-sheet);
}

figcaption {
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink-soft);
  padding-top: 8px;
}

/* --------------------------------------------------------------------------
   pages：首页
   -------------------------------------------------------------------------- */

/* 首屏 */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  gap: 44px;
  align-items: start;
  padding: 40px 0 44px;
  border-bottom: 1px solid var(--rule);
}

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

.hero-copy h1 {
  font-size: 34px;
  font-weight: 600;
  line-height: 1.32;
  color: var(--ink);
  padding-left: 14px;
  border-left: 4px solid var(--ochre);
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 22px;
  max-width: 34em;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 18px;
  border-top: 1px dashed var(--rule-strong);
}

.tag-link {
  display: inline-block;
  font-size: 13px;
  line-height: 1.5;
  padding: 5px 11px;
  min-height: 32px;
  color: var(--teal);
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  border-radius: 2px;
}

.tag-link:hover,
.tag-link:focus-visible {
  color: var(--ochre);
  border-color: var(--ochre);
  text-decoration: none;
}

.hero-media {
  min-width: 0;
  margin: 0;
}

.hero-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
}

.hero-media figcaption {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  padding-top: 10px;
}

/* 题材目录预览 + 最近收录 */
.preview-band {
  padding: 44px 0;
  border-bottom: 1px solid var(--rule);
}

.preview-grid {
  display: grid;
  grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  gap: var(--gap);
  align-items: start;
}

.alpha-preview,
.recent-slate {
  min-width: 0;
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 20px 22px 22px;
}

.alpha-segments {
  margin-bottom: 14px;
}

.alpha-row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 9px 0;
  border-bottom: 1px dashed var(--rule);
}

.alpha-row:first-child {
  border-top: 1px dashed var(--rule);
}

.alpha-key {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--teal);
  white-space: nowrap;
}

.alpha-items {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.slate-list {
  margin-bottom: 14px;
}

.slate-row {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px dashed var(--rule);
}

.slate-row:first-child {
  border-top: 1px dashed var(--rule);
}

.slate-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ochre);
  white-space: nowrap;
}

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

/* 频道对照速览 */
.channel-glance {
  padding: 44px 0;
  border-bottom: 1px solid var(--rule);
}

.channel-rows {
  border-top: 1px solid var(--rule);
}

.channel-row {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) 116px;
  gap: 20px;
  align-items: center;
  padding: 15px 0 15px 12px;
  border-bottom: 1px solid var(--rule);
  border-left: 3px solid transparent;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.channel-row:hover,
.channel-row:focus-within {
  border-left-color: var(--ochre);
  background: var(--paper-sheet);
}

.channel-row .channel-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  padding-left: 0;
  border-left: 0;
}

.channel-dir {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.channel-row .row-link {
  justify-self: end;
  font-size: 14px;
  font-weight: 600;
  color: var(--ochre);
  white-space: nowrap;
}

.channel-row .row-link:hover,
.channel-row .row-link:focus-visible {
  color: var(--teal);
}

/* 专题档案摘录 */
.topic-excerpt {
  padding: 44px 0;
  border-bottom: 1px solid var(--rule);
}

.topic-block {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: var(--gap);
  align-items: start;
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 20px;
}

.topic-block + .topic-block {
  margin-top: 20px;
}

.topic-block .topic-media {
  min-width: 0;
  margin: 0;
}

.topic-block .topic-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: 3px;
}

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

.topic-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ochre);
  margin-bottom: 6px;
}

.topic-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.topic-scope {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.topic-points {
  margin-bottom: 14px;
}

.topic-points li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

.topic-points li + li {
  margin-top: 4px;
}

.topic-points li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--ochre);
  font-weight: 700;
}

/* 观看答疑中心 */
.faq-center {
  padding: 44px 0;
  border-bottom: 1px solid var(--rule);
}

.faq-layout {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: var(--gap);
  align-items: start;
}

.faq-layout.sidebar-left {
  grid-template-columns: var(--rail) minmax(0, 1fr);
}

.faq-toc {
  min-width: 0;
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 16px 16px 18px;
}

.toc-title {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule-strong);
  margin-bottom: 10px;
}

.toc-list li + li {
  border-top: 1px dashed var(--rule);
}

.toc-list a {
  display: block;
  padding: 8px 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}

.toc-list a:hover,
.toc-list a:focus-visible {
  color: var(--ochre);
}

.faq-list {
  min-width: 0;
}

/* 三种进入方式 */
.entry-paths {
  padding: 44px 0;
  border-bottom: 1px solid var(--rule);
}

.path-rows {
  border-top: 1px solid var(--rule);
}

.path-row {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr) 132px;
  gap: 20px;
  align-items: center;
  padding: 15px 0 15px 12px;
  border-bottom: 1px solid var(--rule);
  border-left: 3px solid transparent;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.path-row:hover,
.path-row:focus-within {
  border-left-color: var(--teal);
  background: var(--paper-sheet);
}

.path-row .path-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.path-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.path-row .row-link {
  justify-self: end;
  font-size: 14px;
  font-weight: 600;
  color: var(--ochre);
  white-space: nowrap;
}

.path-row .row-link:hover,
.path-row .row-link:focus-visible {
  color: var(--teal);
}

/* 内容说明与纠错 */
.content-boundary {
  padding: 44px 0 0;
}

.boundary-box {
  background: var(--ochre-soft);
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  padding: 22px 24px 24px;
}

.boundary-box .boundary-list {
  margin-bottom: 16px;
}

.boundary-box .boundary-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

.boundary-box .boundary-list li + li {
  margin-top: 8px;
}

.boundary-box .boundary-list li::before {
  content: "§";
  position: absolute;
  left: 2px;
  font-family: var(--mono);
  color: var(--ochre);
}

/* --------------------------------------------------------------------------
   pages：题材索引
   -------------------------------------------------------------------------- */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--rail);
  gap: var(--gap);
  align-items: start;
  padding-top: 28px;
}

.page-layout.sidebar-left {
  grid-template-columns: var(--rail) minmax(0, 1fr);
}

.page-main {
  min-width: 0;
  max-width: var(--read);
}

.letter-nav-list {
  border-top: 1px solid var(--rule);
}

.letter-nav-item {
  border-bottom: 1px solid var(--rule);
}

.letter-link {
  display: block;
  padding: 9px 2px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
}

.letter-link:hover,
.letter-link:focus-visible {
  color: var(--ochre);
  padding-left: 6px;
  border-left: 2px solid var(--ochre);
}

.letter-range {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--teal);
}

.letter-desc {
  display: block;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin-top: 2px;
}

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

.page-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
}

.page-figure-caption {
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink-soft);
  padding-top: 8px;
}

.genre-section {
  padding: 24px 0;
  border-top: 1px solid var(--rule);
  scroll-margin-top: 96px;
}

.genre-section:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.group-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.group-code {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--ochre);
  background: var(--ochre-soft);
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  padding: 1px 8px;
}

.group-intro {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.genre-list {
  border-top: 1px solid var(--rule);
}

.genre-item {
  padding: 14px 0 14px 12px;
  border-bottom: 1px solid var(--rule);
  border-left: 3px solid transparent;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.genre-item:hover,
.genre-item:focus-within {
  border-left-color: var(--ochre);
  background: var(--paper-sheet);
}

.genre-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}

.genre-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

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

.tag,
.tag-channel,
.tag-topic {
  display: inline-block;
  font-size: 12px;
  line-height: 1.6;
  padding: 1px 8px;
  margin-right: 6px;
  border-radius: 2px;
  border: 1px solid var(--rule);
  background: var(--paper-sheet);
  color: var(--teal);
}

.tag-channel {
  border-color: var(--rule-strong);
  color: var(--teal);
}

.tag-topic {
  border-color: var(--rule-strong);
  color: var(--ochre);
}

.index-notes {
  padding: 28px 0 0;
  border-top: 1px solid var(--rule);
}

.index-notes-text {
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

/* --------------------------------------------------------------------------
   pages：频道对照
   -------------------------------------------------------------------------- */
.compare-dimensions,
.compare-channels,
.choose-advice,
.related-entry {
  padding: 36px 0;
  border-bottom: 1px solid var(--rule);
}

.compare-dimensions {
  padding-top: 32px;
}

.dimension-list {
  border-top: 1px solid var(--rule);
}

.dimension-item {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr);
  gap: 20px;
  align-items: baseline;
  padding: 13px 0 13px 12px;
  border-bottom: 1px solid var(--rule);
  border-left: 3px solid transparent;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.dimension-item:hover {
  border-left-color: var(--ochre);
  background: var(--paper-sheet);
}

.dimension-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.dimension-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.channel-block {
  min-width: 0;
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--teal);
  border-radius: 3px;
  padding: 18px 16px 20px;
}

.channel-block .channel-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

.channel-tagline {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--rule);
  margin-bottom: 12px;
}

.channel-dl {
  display: grid;
  gap: 2px;
}

.channel-dl dt {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ochre);
  margin-top: 8px;
}

.channel-dl dt:first-of-type {
  margin-top: 0;
}

.channel-dl dd {
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink);
}

.compare-figure {
  margin: 0;
  padding: 32px 0 0;
}

.compare-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
}

.advice-list {
  counter-reset: advice;
  border-top: 1px solid var(--rule);
}

.advice-item {
  counter-increment: advice;
  position: relative;
  padding: 16px 0 16px 44px;
  border-bottom: 1px solid var(--rule);
}

.advice-item::before {
  content: counter(advice, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 17px;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--ochre);
}

.advice-scene {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}

.advice-body {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

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

.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}

.related-entry .related-list {
  padding-top: 4px;
}

.related-item .related-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--ochre);
}

/* --------------------------------------------------------------------------
   pages：专题档案
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--shell);
  margin: 0 auto;
}

.topic-intro {
  padding: 28px 0 0;
}

.topic-intro > p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: var(--read);
  margin-bottom: 16px;
}

.topic-index-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
}

.topic-index-item {
  min-width: 0;
}

.topic-card {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: var(--gap);
  align-items: start;
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
  scroll-margin-top: 96px;
}

.topic-card .topic-media {
  min-width: 0;
  margin: 0;
}

.topic-card .topic-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
}

.topic-media-caption {
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink-soft);
  padding-top: 8px;
}

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

.topic-no {
  margin-bottom: 8px;
}

.topic-title {
  font-size: 21px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}

.topic-card .topic-scope {
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 16px;
}

.topic-subtitle {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--rule-strong);
  margin-bottom: 10px;
}

.topic-compose-list {
  margin-bottom: 18px;
}

.topic-compose-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

.topic-compose-list li + li {
  margin-top: 5px;
}

.topic-compose-list li::before {
  content: "·";
  position: absolute;
  left: 5px;
  color: var(--ochre);
  font-weight: 700;
}

.topic-meta-block {
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 14px 16px 16px;
}

.topic-channel {
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 12px;
}

.topic-channel a {
  font-weight: 600;
  color: var(--ochre);
}

.topic-order-list {
  counter-reset: order;
}

.topic-order-list li {
  counter-increment: order;
  position: relative;
  padding-left: 26px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

.topic-order-list li + li {
  margin-top: 5px;
}

.topic-order-list li::before {
  content: counter(order) ".";
  position: absolute;
  left: 0;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--teal);
}

.topic-usage {
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
}

.usage-list {
  margin-bottom: 14px;
}

.usage-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.usage-list li + li {
  margin-top: 6px;
}

.usage-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--rule-strong);
}

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

.usage-link a {
  font-weight: 600;
  color: var(--ochre);
}

.related-links-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.topic-archive .related-links,
.related-links[aria-label="相关内容"] {
  margin-top: 24px;
}

/* --------------------------------------------------------------------------
   pages：观看答疑
   -------------------------------------------------------------------------- */
.faq-sidebar {
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 16px 16px 18px;
}

.sidebar-nav {
  min-width: 0;
}

.sidebar-list {
  border-top: 1px solid var(--rule);
}

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

.sidebar-list a {
  display: block;
  padding: 9px 2px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}

.sidebar-list a:hover,
.sidebar-list a:focus-visible {
  color: var(--ochre);
  padding-left: 6px;
  border-left: 2px solid var(--ochre);
}

.sidebar-desc {
  display: block;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin-top: 2px;
}

.faq-main {
  min-width: 0;
  max-width: var(--read);
}

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

.faq-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
}

.faq-figure figcaption {
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink-soft);
  padding-top: 8px;
}

.faq-group {
  padding: 24px 0;
  border-top: 1px solid var(--rule);
  scroll-margin-top: 96px;
}

.faq-group:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.faq-group-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  padding-left: 12px;
  border-left: 3px solid var(--ochre);
  margin-bottom: 6px;
}

.faq-group-lead {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.faq-closing {
  padding: 28px 0 0;
  border-top: 1px solid var(--rule);
}

.faq-closing-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.faq-closing > p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.faq-closing-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.faq-closing-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--ochre);
}

/* --------------------------------------------------------------------------
   pages：收录动态
   -------------------------------------------------------------------------- */
.page-head-inner {
  min-width: 0;
}

.slate-section,
.slate-types,
.slate-check {
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
}

.slate-inner,
.slate-types-inner,
.slate-check-inner {
  max-width: 820px;
  margin: 0 auto;
}

.section-head {
  margin-bottom: 4px;
}

.slate-figure {
  margin: 0 0 24px;
}

.slate-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
}

.slate-caption {
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink-soft);
  padding-top: 8px;
}

.slate-list {
  border-top: 1px solid var(--rule);
}

.slate-section .slate-row {
  display: grid;
  grid-template-columns: 108px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 16px 0 16px 12px;
  border-bottom: 1px solid var(--rule);
  border-left: 3px solid transparent;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.slate-section .slate-row:hover {
  border-left-color: var(--ochre);
  background: var(--paper-sheet);
}

.slate-section .slate-code {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--teal);
  white-space: nowrap;
  padding-top: 1px;
}

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

.slate-scope {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
  margin-bottom: 4px;
}

.slate-type {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  padding: 0 8px;
  border-radius: 2px;
  border: 1px solid var(--rule-strong);
  margin-bottom: 6px;
}

.slate-type-add {
  color: var(--teal);
  background: var(--paper-sheet);
}

.slate-type-adjust {
  color: var(--ochre);
  background: var(--ochre-soft);
}

.slate-type-revise {
  color: var(--ink-soft);
  background: var(--paper-sheet);
}

.slate-section .slate-text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.type-list {
  border-top: 1px solid var(--rule);
}

.type-item {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr);
  gap: 20px;
  align-items: baseline;
  padding: 13px 0 13px 12px;
  border-bottom: 1px solid var(--rule);
  border-left: 3px solid transparent;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.type-item:hover {
  border-left-color: var(--teal);
  background: var(--paper-sheet);
}

.type-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.type-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.check-list {
  border-top: 1px solid var(--rule);
  margin-bottom: 14px;
}

.check-item {
  padding: 13px 0 13px 12px;
  border-bottom: 1px solid var(--rule);
  border-left: 3px solid transparent;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.check-item:hover {
  border-left-color: var(--ochre);
  background: var(--paper-sheet);
}

.check-label {
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink);
}

.check-note {
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.check-note a {
  font-weight: 600;
  color: var(--ochre);
}

.check-entry {
  font-size: 14px;
}

.entry-link {
  font-weight: 600;
  color: var(--ochre);
}

/* --------------------------------------------------------------------------
   pages：内容说明
   -------------------------------------------------------------------------- */
.notes-figure {
  margin: 28px 0 0;
}

.notes-figure img {
  width: 100%;
  max-width: var(--read);
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
}

.notes-figure-caption {
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink-soft);
  padding-top: 8px;
}

.notes-section {
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
  max-width: var(--read);
}

.notes-related {
  border-bottom: 0;
}

.notes-boundary .boundary-list {
  background: var(--ochre-soft);
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  padding: 18px 20px;
}

.boundary-item {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.boundary-item + .boundary-item {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--rule-strong);
}

.boundary-mark {
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ochre);
  text-align: center;
}

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

.boundary-heading {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 3px;
}

.boundary-text {
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.step-list {
  counter-reset: step;
  border-top: 1px solid var(--rule);
}

.step-item {
  counter-increment: step;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  grid-template-areas:
    "index heading"
    "index text";
  gap: 2px 14px;
  padding: 16px 0 16px 12px;
  border-bottom: 1px solid var(--rule);
  border-left: 3px solid transparent;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.step-item:hover {
  border-left-color: var(--ochre);
  background: var(--paper-sheet);
}

.step-index {
  grid-area: index;
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--teal);
  line-height: 1.7;
}

.step-index::before {
  content: counter(step, decimal-leading-zero);
}

.step-heading {
  grid-area: heading;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.step-text {
  grid-area: text;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.fix-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--gap);
  align-items: start;
}

.fix-checklist,
.fix-flow {
  min-width: 0;
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 18px 18px 20px;
}

.fix-subtitle {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule-strong);
  margin-bottom: 12px;
}

.checklist-item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 8px 0;
}

.checklist-item + .checklist-item {
  border-top: 1px dashed var(--rule);
}

.checklist-name {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ochre);
  line-height: 1.7;
}

.checklist-desc {
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.flow-item {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 8px 0;
}

.flow-item + .flow-item {
  border-top: 1px dashed var(--rule);
}

.flow-index {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.75;
  color: var(--teal);
}

.flow-text {
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.clarify-list {
  border-top: 1px solid var(--rule);
}

.clarify-item {
  padding: 12px 0 12px 12px;
  border-bottom: 1px solid var(--rule);
  border-left: 3px solid transparent;
}

.clarify-item:hover {
  border-left-color: var(--teal);
  background: var(--paper-sheet);
}

.clarify-text {
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink);
}

.notes-related .related-links {
  border-top: 1px solid var(--rule);
  padding-top: 14px;
}

.notes-related .related-item a {
  font-size: 14px;
  font-weight: 600;
  color: var(--ochre);
}

/* --------------------------------------------------------------------------
   pages：404
   -------------------------------------------------------------------------- */
.error-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 64px 24px 80px;
  width: 100%;
}

.error-panel {
  max-width: 620px;
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--ochre);
  border-radius: 3px;
  padding: 32px 30px 30px;
}

.error-code {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--ochre);
  margin-bottom: 8px;
}

.error-title {
  font-size: 30px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
  margin-bottom: 12px;
}

.error-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 20px;
}

.error-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  padding: 16px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 20px;
}

.error-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--ochre);
}

.error-actions {
  font-size: 14px;
}

.btn-home {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  color: #fffdf8;
  background: var(--ochre);
  border: 1px solid var(--ochre);
  border-radius: 3px;
}

.btn-home:hover,
.btn-home:focus-visible {
  background: #9c4718;
  border-color: #9c4718;
  color: #fffdf8;
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   responsive：1024 / 768 / 520 三档
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .header-inner {
    padding: 12px 20px;
    gap: 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
  }

  .nav-list.is-open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--paper-sheet);
    border-bottom: 1px solid var(--rule);
    padding: 4px 0;
    z-index: 50;
  }

  .nav-list.is-open li + li {
    border-top: 1px solid var(--rule);
  }

  .nav-list.is-open .nav-link {
    padding: 13px 20px;
    min-height: 48px;
    border-bottom: 0;
    border-left: 3px solid transparent;
  }

  .nav-list.is-open .nav-link.is-current {
    border-left-color: var(--ochre);
    background: var(--ochre-soft);
  }

  .site-nav {
    position: static;
  }

  .home-main,
  .inner-main {
    padding: 0 20px 60px;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding: 32px 0 36px;
  }

  .hero-copy h1 {
    font-size: 30px;
  }

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

  .channel-row,
  .path-row {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 6px 16px;
  }

  .channel-row .row-link,
  .path-row .row-link {
    grid-column: 2;
    justify-self: start;
  }

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

  .faq-layout,
  .faq-layout.sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .faq-toc {
    padding: 14px 16px;
  }

  .toc-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0 6px;
  }

  .toc-list li {
    border-top: 0 !important;
  }

  .toc-list a {
    padding: 6px 10px;
    border: 1px solid var(--rule);
    border-radius: 2px;
    background: var(--paper);
    font-size: 13px;
  }

  .page-layout,
  .page-layout.sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    padding-top: 22px;
  }

  .page-main,
  .faq-main {
    max-width: none;
  }

  .sidebar {
    order: 2;
  }

  .page-main,
  .faq-main {
    order: 1;
  }

  .letter-nav-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    border-top: 0;
  }

  .letter-nav-item {
    border-bottom: 0;
  }

  .letter-link {
    padding: 7px 11px;
    border: 1px solid var(--rule);
    border-radius: 2px;
    background: var(--paper);
    font-size: 13px;
  }

  .letter-link:hover,
  .letter-link:focus-visible {
    padding-left: 11px;
    border-left: 1px solid var(--ochre);
  }

  .sidebar-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    border-top: 0;
  }

  .sidebar-list li {
    border-bottom: 0;
  }

  .sidebar-list a {
    padding: 7px 11px;
    border: 1px solid var(--rule);
    border-radius: 2px;
    background: var(--paper);
    font-size: 13px;
  }

  .sidebar-list a:hover,
  .sidebar-list a:focus-visible {
    padding-left: 11px;
    border-left: 1px solid var(--ochre);
  }

  .sidebar-desc {
    display: none;
  }

  .channel-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .footer-inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

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

@media (max-width: 768px) {
  .brand-logo {
    font-size: 18px;
  }

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

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

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

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

  .hero-media img {
    aspect-ratio: 16 / 10;
  }

  .alpha-row,
  .slate-row {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 10px;
  }

  .channel-row,
  .path-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 14px 0 14px 12px;
  }

  .channel-row .row-link,
  .path-row .row-link {
    grid-column: 1;
    justify-self: start;
    margin-top: 4px;
  }

  .dimension-item,
  .type-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

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

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

  .slate-section .slate-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .slate-section .slate-code {
    padding-top: 0;
  }

  .compare-figure img,
  .slate-figure img {
    aspect-ratio: 16 / 9;
  }

  .error-panel {
    padding: 26px 22px 24px;
  }

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

  .footer-inner {
    padding: 32px 20px 24px;
  }

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

@media (max-width: 520px) {
  .header-inner {
    padding: 10px 16px;
  }

  .home-main,
  .inner-main {
    padding: 0 16px 48px;
  }

  .hero {
    padding: 24px 0 28px;
  }

  .hero-copy h1 {
    font-size: 24px;
    padding-left: 12px;
    border-left-width: 3px;
  }

  .hero-lead {
    font-size: 15px;
  }

  .hero-actions {
    gap: 10px;
  }

  .btn {
    flex: 1 1 auto;
    min-width: 132px;
  }

  .page-title {
    font-size: 24px;
    padding-left: 12px;
    border-left-width: 3px;
  }

  .preview-band,
  .channel-glance,
  .topic-excerpt,
  .faq-center,
  .entry-paths,
  .content-boundary {
    padding: 32px 0;
  }

  .content-boundary {
    padding-bottom: 0;
  }

  .alpha-preview,
  .recent-slate {
    padding: 16px 16px 18px;
  }

  .alpha-row,
  .slate-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
    padding: 9px 0;
  }

  .alpha-key,
  .slate-code {
    font-size: 12px;
  }

  .topic-block {
    padding: 16px;
  }

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

  .faq-question {
    padding: 12px 40px 12px 14px;
    font-size: 14px;
  }

  .faq-answer {
    padding: 11px 14px 13px;
    font-size: 13px;
  }

  .boundary-box {
    padding: 18px 16px 20px;
  }

  .page-figure img,
  .faq-figure img,
  .notes-figure img {
    aspect-ratio: 4 / 3;
  }

  .topic-card .topic-media img {
    aspect-ratio: 16 / 10;
  }

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

  .topic-meta-block {
    padding: 12px 14px 14px;
  }

  .fix-checklist,
  .fix-flow {
    padding: 16px 14px 18px;
  }

  .checklist-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .step-item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 2px 10px;
  }

  .slate-inner,
  .slate-types-inner,
  .slate-check-inner {
    max-width: none;
  }

  .error-main {
    padding: 40px 16px 56px;
  }

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

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 28px 16px 20px;
  }

  .footer-brand {
    grid-column: auto;
  }

  .footer-links a {
    padding: 8px 0;
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .footer-bottom {
    padding: 14px 16px 22px;
  }
}

/* 尊重减弱动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}