/* =========================================================
   蜜桃视频 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================= */

/* ---------------------------------------------------------
   1. base：变量、重置、排版基础
   --------------------------------------------------------- */
:root {
  --paper: #f4f1ea;
  --ink: #1b1a18;
  --graphite: #4a4740;
  --brick: #b5552f;
  --line: #e3ded3;
  --pine: #2f6b5e;
  --paper-soft: #fbf9f4;
  --ink-soft: #2a2824;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-narrow: "Arial Narrow", "Helvetica Neue Condensed", Arial, sans-serif;

  --container: 1160px;
  --doc-width: 820px;
  --gutter: 32px;
  --radius: 6px;
  --shadow-soft: 0 1px 0 var(--line);
  --ease: 180ms ease;
}

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

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

body.site-body {
  margin: 0;
  padding: 0;
  background-color: var(--paper);
  color: var(--graphite);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-align: left;
}

h1 { font-size: 40px; line-height: 1.15; }
h2 { font-size: 26px; line-height: 1.3; }
h3 { font-size: 18px; line-height: 1.45; }
h4 { font-size: 15px; line-height: 1.5; }

p {
  margin: 0 0 16px;
}

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

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

a {
  color: var(--ink);
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease), background-color var(--ease);
}

a:hover,
a:focus-visible {
  color: var(--brick);
}

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

figure {
  margin: 0;
}

dl,
dd,
dt {
  margin: 0;
}

strong {
  color: var(--ink);
  font-weight: 600;
}

:focus-visible {
  outline: 2px solid var(--brick);
  outline-offset: 3px;
}

/* 数字与英文窄体 */
.step-index,
.channel-index,
.category-index,
.route-index,
.step-two-index,
.error-code {
  font-family: var(--font-narrow);
  font-weight: 400;
}

/* ---------------------------------------------------------
   2. layout：页头、导航、主容器、页脚
   --------------------------------------------------------- */

/* 页头骨架 */
.site-header {
  position: relative;
  z-index: 40;
  background-color: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px var(--gutter);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
  color: var(--ink);
}

.brand:hover .brand-name {
  color: var(--brick);
}

.brand-name {
  font-size: 21px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.brand-tagline {
  font-size: 11px;
  line-height: 1.4;
  color: var(--graphite);
  letter-spacing: 0.02em;
}

/* 桌面标签式导航 */
.primary-nav.site-nav {
  flex: 1 1 auto;
  min-width: 0;
}

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

.nav-link {
  display: inline-block;
  padding: 8px 12px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--graphite);
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--ink);
  border-bottom-color: var(--line);
}

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

/* 描边命令按钮 */
.command-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  min-height: 40px;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--brick);
  background-color: #ffffff;
  border: 1px solid var(--brick);
  border-radius: var(--radius);
}

.command-btn:hover,
.command-btn:focus-visible {
  color: #ffffff;
  background-color: var(--brick);
}

/* 汉堡按钮：桌面隐藏 */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  background-color: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}

.menu-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--ink);
}

/* 移动导航 */
.mobile-nav {
  border-top: 1px solid var(--line);
  background-color: var(--paper);
}

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

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  max-width: var(--container);
  margin: 0 auto;
  padding: 8px var(--gutter) 16px;
}

.mobile-nav-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 4px;
  font-size: 15px;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}

.mobile-nav-list a:hover {
  color: var(--brick);
}

/* 主内容容器 */
.site-main {
  display: block;
}

.home-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter) 96px;
}

.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 28px var(--gutter) 88px;
}

.page-shell {
  width: 100%;
}

.doc-shell {
  max-width: var(--doc-width);
  margin: 0 auto;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--graphite);
}

.breadcrumb a {
  color: var(--graphite);
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

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

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

/* 内页标题区 */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.page-title {
  font-size: 40px;
  line-height: 1.15;
  font-weight: 600;
  color: var(--ink);
}

/* 页脚骨架 */
.site-footer {
  background-color: var(--ink);
  color: #d9d4c9;
  margin-top: 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px var(--gutter) 40px;
}

.footer-brand-name {
  display: block;
  margin-bottom: 10px;
  font-size: 20px;
  font-weight: 700;
  color: #f4f1ea;
}

.footer-desc {
  margin-bottom: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: #b7b1a6;
}

.footer-link {
  display: inline-block;
  font-size: 14px;
  color: #e8e3d8;
  border-bottom: 1px solid #6a655c;
}

.footer-link:hover {
  color: #ffffff;
  border-bottom-color: var(--brick);
}

.footer-title {
  margin-bottom: 14px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  color: #f4f1ea;
}

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

.footer-list a {
  display: block;
  padding: 8px 0;
  font-size: 14px;
  line-height: 1.5;
  color: #b7b1a6;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px var(--gutter) 28px;
  border-top: 1px solid #3a3733;
}

.footer-slogan {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: #8f897e;
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border: 1px solid #4a4740;
  border-radius: 50%;
  color: #e8e3d8;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  color: #ffffff;
  border-color: var(--brick);
}

.back-to-top-icon {
  display: block;
  width: 12px;
  height: 12px;
  border-left: 2px solid currentColor;
  border-top: 2px solid currentColor;
  transform: rotate(45deg) translate(2px, 2px);
}

/* ---------------------------------------------------------
   3. components：通用元件
   --------------------------------------------------------- */

/* 小标签 */
.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--brick);
  text-transform: uppercase;
}

/* 段落引导句 */
.hero-lead,
.page-lead,
.page-lede {
  font-size: 17px;
  line-height: 1.75;
  color: var(--graphite);
}

.section-note {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

/* 文本链接 */
.text-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--brick);
  border-bottom: 1px solid transparent;
}

.text-link:hover {
  border-bottom-color: var(--brick);
}

/* 主按钮 / 描边按钮 */
.btn-primary,
.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.3;
  border-radius: var(--radius);
}

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

.btn-primary:hover {
  background-color: #9c4626;
  border-color: #9c4626;
  color: #ffffff;
}

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

.btn-outline:hover {
  color: var(--brick);
  border-color: var(--brick);
}

/* 区块头 */
.section-head {
  margin-bottom: 28px;
}

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

.section-desc {
  max-width: 62ch;
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--graphite);
}

/* 区块脚注 */
.section-foot {
  margin: 24px 0 0;
}

/* 图片说明 */
figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--graphite);
}

/* 通用图片容器 */
.channel-figure img,
.doc-figure img,
.flow-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-soft);
}

/* 横向滚动区 */
.hscroll {
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.hscroll:focus-visible {
  outline: 2px solid var(--brick);
  outline-offset: 4px;
}

/* 相关内容条 */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 20px var(--gutter) 0;
  font-size: 14px;
}

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

.related-links-item {
  padding-bottom: 2px;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}

.related-links-item:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

/* ---------------------------------------------------------
   4. pages：首页
   --------------------------------------------------------- */

/* 首屏 */
.hero {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 56px;
  align-items: start;
  padding: 64px 0 72px;
}

.hero-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero h1 {
  margin-bottom: 20px;
  font-size: 44px;
  line-height: 1.12;
}

.hero-lead {
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
}

.hero-facts {
  display: flex;
  flex-direction: column;
  gap: 0;
  width: 100%;
  border-top: 1px solid var(--line);
}

.fact-item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.fact-item dt {
  flex: 0 0 96px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--brick);
}

.fact-item dd {
  font-size: 14px;
  line-height: 1.6;
  color: var(--graphite);
}

.hero-visual img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--paper-soft);
}

.hero-caption {
  margin-top: 12px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.hero-tags a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 999px;
  background-color: var(--paper-soft);
}

.hero-tags a:hover {
  color: var(--brick);
  border-color: var(--brick);
}

/* 首页区块通用间距 */
.home-main > section {
  padding: 64px 0;
  border-top: 1px solid var(--line);
}

.home-main > section:first-child {
  border-top: 0;
  padding-top: 0;
}

/* 快速开始三步 */
.step-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.step-item {
  padding: 26px 24px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step-item .step-index {
  display: block;
  margin-bottom: 12px;
  font-size: 28px;
  line-height: 1;
  color: var(--brick);
}

.step-item h3 {
  margin-bottom: 10px;
}

.step-action {
  margin-bottom: 8px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--graphite);
}

.step-result {
  margin: 0;
  padding-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--pine);
  border-top: 1px dashed var(--line);
}

/* 任务分组 */
.task-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.task-card {
  display: flex;
  flex-direction: column;
  padding: 26px 24px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.task-card h3 {
  margin-bottom: 10px;
}

.task-desc {
  margin-bottom: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.task-links {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: auto;
  border-top: 1px solid var(--line);
}

.task-links li {
  border-bottom: 1px solid var(--line);
}

.task-links a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--ink);
}

.task-links a::after {
  content: "→";
  margin-left: auto;
  color: var(--brick);
}

.task-links a:hover {
  color: var(--brick);
}

/* 频道谱系横滑带 */
.channel-track {
  display: flex;
  gap: 16px;
  min-width: 100%;
  width: max-content;
}

.channel-chip {
  flex: 0 0 236px;
  padding: 22px 20px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.channel-chip .channel-index {
  display: block;
  margin-bottom: 10px;
  font-size: 24px;
  line-height: 1;
  color: var(--brick);
}

.channel-chip h3 {
  margin-bottom: 8px;
}

.channel-chip p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--graphite);
}

/* 专题路线预览 */
.topic-layout {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 40px;
  align-items: start;
}

.topic-visual img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-soft);
}

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

.topic-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.topic-item h3 {
  margin-bottom: 8px;
}

.topic-desc {
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.topic-meta {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--pine);
}

/* 卡片字段预览 */
.field-layout {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 40px;
  align-items: start;
}

.field-visual img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-soft);
}

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

.field-points li {
  padding: 14px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
  border-bottom: 1px solid var(--line);
}

.field-points li strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  color: var(--ink);
}

/* 问题分流目录 */
.issue-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.issue-item {
  display: flex;
  flex-direction: column;
  padding: 22px 20px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.issue-item h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

.issue-item p {
  margin-bottom: 16px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--graphite);
}

.issue-item .text-link {
  margin-top: auto;
}

/* 站点边界短块 */
.boundary-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.boundary-list li {
  padding: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
  border-top: 2px solid var(--ink);
}

/* ---------------------------------------------------------
   5. pages：频道总览
   --------------------------------------------------------- */

.page-title-block {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: end;
  margin-bottom: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.page-title-main .eyebrow {
  margin-bottom: 10px;
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.page-meta-item {
  min-width: 88px;
}

.page-meta-item dt,
.meta-item dt {
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--brick);
}

.page-meta-item dd,
.meta-item dd {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 68fr) minmax(0, 32fr);
  gap: 48px;
  align-items: start;
}

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

.page-aside {
  min-width: 0;
  padding-left: 32px;
  border-left: 1px solid var(--line);
}

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

.channel-range h2 {
  margin-bottom: 14px;
}

.channel-range > p {
  margin-bottom: 20px;
  font-size: 15px;
  line-height: 1.75;
}

.range-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.range-point {
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.range-point-index {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-narrow);
  font-size: 20px;
  color: var(--brick);
}

.channel-figure {
  margin-bottom: 44px;
}

.channel-figure img {
  height: 300px;
}

.channel-archive h2 {
  margin-bottom: 10px;
}

.channel-card {
  padding: 26px 0;
  border-top: 1px solid var(--line);
}

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

.channel-card-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}

.channel-card-head .channel-index {
  font-size: 24px;
  line-height: 1;
  color: var(--brick);
}

.channel-name {
  font-size: 19px;
  line-height: 1.4;
}

.channel-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 32px;
}

.channel-field {
  min-width: 0;
}

.channel-field dt {
  margin-bottom: 3px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--graphite);
}

.channel-field dd {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.channel-judge {
  margin-top: 48px;
}

.channel-judge > p {
  margin-bottom: 20px;
  font-size: 15px;
  line-height: 1.75;
}

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

.judge-item {
  padding: 20px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.7;
}

.judge-counter {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-narrow);
  font-size: 20px;
  color: var(--brick);
}

/* 侧栏 */
.aside-block {
  margin-bottom: 32px;
}

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

.aside-title {
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.4;
  color: var(--ink);
}

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

.aside-list li {
  padding: 10px 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--graphite);
  border-bottom: 1px solid var(--line);
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.aside-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  padding-bottom: 6px;
}

.aside-links a:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

.aside-cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--brick);
  border: 1px solid var(--brick);
  border-radius: var(--radius);
  background-color: #ffffff;
}

.aside-cta:hover {
  color: #ffffff;
  background-color: var(--brick);
}

/* 底部入口条 */
.next-bar {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 2px solid var(--ink);
}

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

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

.next-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.next-link:hover {
  border-color: var(--brick);
}

.next-link-label {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.next-link-desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--graphite);
}

/* ---------------------------------------------------------
   6. pages：专题路线
   --------------------------------------------------------- */

.page-head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: end;
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.page-head-main .eyebrow {
  margin-bottom: 8px;
}

.route-intro {
  margin-bottom: 48px;
}

.route-intro h2 {
  margin-bottom: 14px;
}

.route-intro > p {
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.75;
}

.route-intro > p a {
  color: var(--brick);
  border-bottom: 1px solid var(--brick);
}

.route-intro-note {
  margin-top: 14px;
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--graphite);
  background-color: var(--paper-soft);
  border-left: 2px solid var(--brick);
}

.route-item {
  display: grid;
  grid-template-columns: 40fr 60fr;
  gap: 40px;
  align-items: start;
  padding: 40px 0;
  border-top: 1px solid var(--line);
}

.route-media img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-soft);
}

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

.route-index {
  margin-bottom: 6px;
  font-family: var(--font-narrow);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--brick);
}

.route-body h2 {
  margin-bottom: 12px;
}

.route-desc {
  margin-bottom: 18px;
  font-size: 15px;
  line-height: 1.75;
}

.route-tags {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.tag-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--graphite);
}

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

.tag-item {
  padding: 3px 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink);
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.route-body h3 {
  margin-bottom: 12px;
  font-size: 15px;
  color: var(--graphite);
}

.route-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 18px;
  counter-reset: route-step;
}

.route-steps li {
  position: relative;
  padding: 10px 0 10px 34px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
  border-bottom: 1px solid var(--line);
  counter-increment: route-step;
}

.route-steps li::before {
  content: counter(route-step);
  position: absolute;
  left: 0;
  top: 10px;
  width: 22px;
  font-family: var(--font-narrow);
  font-size: 15px;
  color: var(--brick);
}

.route-steps strong {
  display: block;
  font-size: 14px;
  color: var(--ink);
}

.route-pace {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--pine);
}

.route-pace-label {
  margin-right: 6px;
  letter-spacing: 0.08em;
}

/* 互查入口条 */
.entry-bar {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px solid var(--ink);
}

.entry-bar h2 {
  margin-bottom: 10px;
  font-size: 20px;
}

.entry-bar > p {
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.7;
}

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

.entry-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.entry-link:hover {
  border-color: var(--brick);
}

.entry-link-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.entry-link-desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--graphite);
}

/* ---------------------------------------------------------
   7. pages：快速开始
   --------------------------------------------------------- */

.page-shell .page-title-block {
  display: block;
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.page-shell .page-title-block .eyebrow {
  margin-bottom: 10px;
}

.meta-list {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.meta-item {
  min-width: 100px;
}

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

.flow-intro h2 {
  margin-bottom: 14px;
}

.flow-intro > p {
  max-width: 68ch;
  margin-bottom: 14px;
  font-size: 15px;
  line-height: 1.75;
}

.flow-prereq {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--graphite);
  background-color: var(--paper-soft);
  border-left: 2px solid var(--pine);
}

.field-label {
  margin-right: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--pine);
}

.flow-figure {
  margin-bottom: 48px;
}

.flow-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.flow-steps h2 {
  margin-bottom: 24px;
}

.step-block {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

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

.step-block .step-index {
  font-size: 40px;
  line-height: 1;
  color: var(--line);
}

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

.step-name {
  margin-bottom: 16px;
  font-size: 20px;
}

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

.step-col {
  min-width: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.step-col-title {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--brick);
}

.selfcheck {
  margin-top: 56px;
}

.selfcheck h2 {
  margin-bottom: 12px;
}

.selfcheck > p {
  margin-bottom: 24px;
  font-size: 15px;
  line-height: 1.75;
}

.selfcheck-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.selfcheck-item {
  padding: 20px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.selfcheck-item h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

.selfcheck-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.fallback-note {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 2px solid var(--ink);
}

.fallback-note h2 {
  margin-bottom: 12px;
  font-size: 20px;
}

.fallback-note > p {
  margin-bottom: 20px;
  font-size: 15px;
  line-height: 1.75;
}

.fallback-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 20px;
  border-top: 1px solid var(--line);
}

.fallback-list li {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 0;
  font-size: 14px;
  line-height: 1.7;
  border-bottom: 1px solid var(--line);
}

.fallback-list li strong {
  flex: 0 0 auto;
  font-size: 13px;
  color: var(--ink);
}

.fallback-list li a {
  color: var(--brick);
  border-bottom: 1px solid transparent;
}

.fallback-list li a:hover {
  border-bottom-color: var(--brick);
}

.fallback-action {
  margin: 0;
}

/* ---------------------------------------------------------
   8. pages：卡片字段
   --------------------------------------------------------- */

.container.inner-shell {
  width: 100%;
}

.page-hero {
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.page-hero-main .eyebrow {
  margin-bottom: 8px;
}

.page-hero-main .page-lead {
  max-width: 68ch;
}

.page-hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: end;
}

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

.field-intro {
  margin-bottom: 44px;
}

.field-intro h2 {
  margin-bottom: 14px;
}

.field-intro p {
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.75;
}

.field-table-wrap {
  margin-bottom: 48px;
}

.field-table-wrap h2 {
  margin-bottom: 10px;
}

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: #ffffff;
}

.field-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.7;
}

.field-table thead th {
  padding: 14px 18px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink);
  background-color: var(--paper-soft);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.field-table tbody th {
  padding: 14px 18px;
  text-align: left;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  white-space: nowrap;
}

.field-table tbody td {
  padding: 14px 18px;
  color: var(--graphite);
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

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

.field-annotate {
  margin-bottom: 48px;
}

.field-annotate h2 {
  margin-bottom: 20px;
}

.annotate-grid {
  display: grid;
  grid-template-columns: 60fr 40fr;
  gap: 36px;
  align-items: start;
}

.annotate-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-soft);
}

.annotate-notes {
  min-width: 0;
}

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

.read-item {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.read-index {
  font-family: var(--font-narrow);
  font-size: 15px;
  line-height: 1.6;
  color: var(--brick);
}

.read-body {
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.field-misread {
  margin-bottom: 48px;
}

.field-misread h2 {
  margin-bottom: 10px;
}

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

.misread-item {
  padding: 18px 20px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.misread-wrong {
  margin-bottom: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
  text-decoration: line-through;
}

.misread-right {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.misread-right::before {
  content: "更正 ";
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--pine);
}

.field-missing {
  margin-bottom: 48px;
}

.field-missing h2 {
  margin-bottom: 10px;
}

.step-two {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.step-two-item {
  padding: 22px 20px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step-two-index {
  display: block;
  margin-bottom: 8px;
  font-size: 24px;
  line-height: 1;
  color: var(--brick);
}

.step-two-item h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

.step-two-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.field-links {
  padding-top: 32px;
  border-top: 2px solid var(--ink);
}

.field-links h2 {
  margin-bottom: 20px;
  font-size: 20px;
}

.link-bar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.link-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.link-card:hover {
  border-color: var(--brick);
}

.link-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.link-card-desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--graphite);
}

/* ---------------------------------------------------------
   9. pages：问题反馈
   --------------------------------------------------------- */

.page-feedback .breadcrumb {
  display: none;
}

.page-hero-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: end;
}

.page-hero-text {
  min-width: 0;
}

.page-hero-text .eyebrow {
  margin-bottom: 8px;
}

.section {
  margin-bottom: 56px;
}

.section:last-child {
  margin-bottom: 0;
}

.section-intro .section-head h2 {
  margin-bottom: 16px;
}

.section-body p {
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.75;
}

.section-categories .section-head h2 {
  margin-bottom: 10px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.category-card {
  display: flex;
  flex-direction: column;
  padding: 22px 20px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.category-card-wide {
  grid-column: span 3;
}

.category-index {
  display: block;
  margin-bottom: 8px;
  font-size: 22px;
  line-height: 1;
  color: var(--brick);
}

.category-name {
  margin-bottom: 8px;
  font-size: 16px;
}

.category-desc {
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.category-page {
  margin-bottom: 14px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--pine);
}

.category-link {
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--brick);
  border-bottom: 1px solid transparent;
}

.category-link:hover {
  border-bottom-color: var(--brick);
}

.section-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-soft);
}

.section-checks .section-head h2 {
  margin-bottom: 10px;
}

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

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

.check-summary {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 52px;
  padding: 12px 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.check-summary::before {
  content: "+";
  flex: 0 0 22px;
  font-family: var(--font-narrow);
  font-size: 20px;
  line-height: 1;
  color: var(--brick);
}

.check-block[open] .check-summary::before {
  content: "−";
}

.check-summary:hover {
  color: var(--brick);
}

.check-body {
  padding: 4px 0 20px 32px;
}

.check-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.check-step {
  padding: 12px 0;
  border-top: 1px dashed var(--line);
}

.check-step-title {
  margin-bottom: 4px;
  font-size: 14px;
  color: var(--ink);
}

.check-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.template-block {
  padding: 24px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.template-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.template-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

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

.template-field {
  font-size: 14px;
  color: var(--ink);
}

.template-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.section-skip h2 {
  margin-bottom: 16px;
}

.skip-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.skip-item {
  padding: 18px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
  border-top: 2px solid var(--line);
}

.skip-title {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  color: var(--ink);
}

.section-entry {
  padding-top: 32px;
  border-top: 2px solid var(--ink);
}

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

.entry-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.entry-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.entry-card:hover {
  border-color: var(--brick);
}

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

.entry-desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--graphite);
}

/* ---------------------------------------------------------
   10. pages：站点边界
   --------------------------------------------------------- */

.doc-shell .page-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.doc-section {
  margin-bottom: 48px;
}

.doc-section:last-child {
  margin-bottom: 0;
}

.doc-block h2 {
  margin-bottom: 14px;
}

.doc-block p {
  font-size: 15px;
  line-height: 1.8;
}

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

.doc-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.boundary-item {
  padding: 16px 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
  border-top: 1px solid var(--line);
}

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

.criteria-label {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--brick);
}

.criteria-list,
.standard-list,
.not-do-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.criteria-list li,
.standard-list li,
.not-do-list li {
  padding: 12px 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
  border-top: 1px solid var(--line);
}

.standard-group {
  margin-bottom: 20px;
}

.standard-group h3 {
  margin-bottom: 8px;
  font-size: 15px;
}

/* ---------------------------------------------------------
   11. pages：404
   --------------------------------------------------------- */

.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 80px var(--gutter) 96px;
}

.error-hero {
  max-width: 640px;
  margin-bottom: 56px;
}

.error-code {
  margin: 0 0 12px;
  font-size: 56px;
  line-height: 1;
  color: var(--line);
}

.error-title {
  margin-bottom: 16px;
}

.error-lead {
  margin-bottom: 28px;
  font-size: 16px;
  line-height: 1.75;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
}

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

.section-title {
  margin-bottom: 10px;
  font-size: 22px;
}

.error-suggest .section-desc {
  margin-bottom: 20px;
}

.error-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.error-list li a {
  display: flex;
  align-items: center;
  min-height: 56px;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.error-note {
  font-size: 14px;
  line-height: 1.7;
}

.error-note a {
  color: var(--brick);
  border-bottom: 1px solid var(--brick);
}

/* ---------------------------------------------------------
   12. responsive：1024 / 768 / 520
   --------------------------------------------------------- */

@media (max-width: 1024px) {
  :root {
    --gutter: 24px;
  }

  .nav-list {
    gap: 0;
  }

  .nav-link {
    padding: 8px 9px;
    font-size: 13px;
  }

  .header-inner {
    gap: 20px;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 36px;
    padding: 40px 0 56px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-visual img {
    height: 360px;
  }

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

  .step-row .step-item:last-child,
  .task-grid .task-card:last-child {
    grid-column: span 2;
  }

  .topic-layout,
  .field-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .topic-visual img,
  .field-visual img {
    height: 300px;
  }

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

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

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }

  .page-aside {
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 28px;
  }

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

  .route-item {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .route-media img {
    height: 260px;
  }

  .annotate-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .annotate-figure img {
    height: 300px;
  }

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

  .category-card-wide {
    grid-column: span 2;
  }

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

  .link-bar .link-card:last-child {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .primary-nav.site-nav {
    display: none;
  }

  .header-inner {
    flex-wrap: nowrap;
    padding: 14px var(--gutter);
  }

  .brand {
    flex: 1 1 auto;
    min-width: 0;
  }

  .brand-tagline {
    display: none;
  }

  .command-btn {
    min-height: 38px;
    padding: 6px 12px;
    font-size: 13px;
  }

  .menu-toggle {
    display: flex;
  }

  .inner-main {
    padding-top: 20px;
  }

  .page-title {
    font-size: 30px;
  }

  .page-header {
    margin-bottom: 24px;
    padding-bottom: 18px;
  }

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

  .hero-visual img {
    height: 280px;
  }

  .home-main > section {
    padding: 48px 0;
  }

  .page-title-block,
  .page-head,
  .page-hero,
  .page-hero-inner {
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: start;
  }

  .page-meta,
  .meta-list {
    gap: 18px;
  }

  .channel-fields {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .range-points,
  .judge-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .next-links,
  .entry-bar-links,
  .entry-row,
  .skip-list {
    grid-template-columns: 1fr;
  }

  .step-block {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .step-block .step-index {
    font-size: 30px;
  }

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

  .selfcheck-grid,
  .step-two {
    grid-template-columns: 1fr;
  }

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

  .template-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .check-body {
    padding-left: 0;
  }

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

  .footer-bottom {
    flex-wrap: wrap;
  }
}

@media (max-width: 520px) {
  :root {
    --gutter: 18px;
  }

  body.site-body {
    font-size: 16px;
  }

  h1,
  .page-title {
    font-size: 28px;
  }

  h2 {
    font-size: 21px;
  }

  .hero h1 {
    font-size: 27px;
  }

  .hero-actions {
    width: 100%;
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-outline {
    flex: 1 1 auto;
    padding: 10px 16px;
    font-size: 14px;
  }

  .hero-visual img {
    height: 220px;
  }

  .step-row,
  .task-grid,
  .issue-grid,
  .category-grid,
  .link-bar {
    grid-template-columns: 1fr;
  }

  .step-row .step-item:last-child,
  .task-grid .task-card:last-child,
  .category-card-wide,
  .link-bar .link-card:last-child {
    grid-column: auto;
  }

  .channel-chip {
    flex: 0 0 78vw;
  }

  .topic-visual img,
  .field-visual img,
  .channel-figure img,
  .flow-figure img,
  .section-media img,
  .annotate-figure img,
  .doc-figure img,
  .route-media img {
    height: 200px;
  }

  .fact-item {
    flex-direction: column;
    gap: 4px;
  }

  .fact-item dt {
    flex: none;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-bottom: 28px;
  }

  .footer-list a {
    min-height: 44px;
  }

  .error-main {
    padding-top: 56px;
  }

  .error-code {
    font-size: 44px;
  }

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

  .misread-item,
  .template-block {
    padding: 16px;
  }

  .doc-block p,
  .section-body p,
  .route-desc {
    font-size: 15px;
  }
}

/* 动效增强：不依赖 JS，且不影响初始可见 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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