/* ==========================================================================
   囧次元 · vrhst.cn 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* ==========================================================================
   base
   ========================================================================== */

:root {
  --ink: #23282d;
  --ink-soft: #5b6570;
  --ink-faint: #838d96;
  --accent: #2f6f6a;
  --accent-deep: #245955;
  --blue: #3a6ea8;
  --line: #e8ebed;
  --line-strong: #d3d9dd;
  --surface: #f6f8f8;
  --paper: #ffffff;
  --radius: 8px;
  --radius-sm: 5px;
  --shell: 1120px;
  --body-col: 720px;
  --side-col: 260px;
  --gap-col: 40px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", "WenQuanYi Micro Hei", Arial, sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;
}

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

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

body.site-body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: normal;
}

p {
  margin: 0;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease;
}

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

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

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

figure {
  margin: 0;
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  cursor: pointer;
}

/* ==========================================================================
   layout · 全站骨架
   ========================================================================== */

.site-main {
  display: block;
}

.inner-main {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 64px;
}

.home-main {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 72px;
}

/* 顶部事实条 */
.fact-bar {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.fact-bar p {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 9px 24px;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.6;
}

/* 页头 */
.site-header {
  position: relative;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

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

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

.brand:hover,
.brand:focus-visible {
  color: var(--accent);
}

/* 主导航 */
.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item {
  position: relative;
}

.nav-item > a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 13px;
  border-bottom: 2px solid transparent;
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
}

.nav-item > a:hover,
.nav-item > a:focus-visible {
  border-bottom-color: var(--line-strong);
  color: var(--accent);
}

.nav-item > a.is-current {
  border-bottom-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.nav-sub {
  position: absolute;
  top: 100%;
  left: 0;
  display: none;
  min-width: 208px;
  padding: 8px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper);
  box-shadow: 0 8px 20px rgba(35, 40, 45, .08);
}

.nav-item.has-sub:hover .nav-sub,
.nav-item.has-sub:focus-within .nav-sub {
  display: block;
}

.nav-sub li a {
  display: block;
  padding: 9px 16px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.5;
}

.nav-sub li a:hover,
.nav-sub li a:focus-visible {
  background: var(--surface);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--paper);
  color: var(--ink);
  font-size: 14px;
  line-height: 1;
}

.nav-toggle::before {
  content: "菜单";
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 0;
  color: var(--ink-soft);
  font-size: 14px;
}

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

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

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

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

/* 页面标题区 */
.page-header {
  padding: 14px 0 26px;
  border-bottom: 1px solid var(--line);
}

.page-title {
  font-size: 32px;
  font-weight: 700;
}

.page-description {
  max-width: 62em;
  margin-top: 12px;
  color: var(--ink-soft);
  font-size: 16px;
}

.page-toc {
  margin-top: 20px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.toc-title {
  margin-bottom: 8px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
}

.page-toc ul,
.page-toc ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
}

.page-toc li a,
.toc-list li a {
  display: inline-block;
  padding: 3px 0;
  color: var(--accent);
  font-size: 14px;
  line-height: 1.6;
}

.page-toc li a:hover,
.toc-list li a:hover {
  color: var(--accent-deep);
  text-decoration: underline;
}

/* 内页两栏布局：主内容在前，aside 在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--body-col)) var(--side-col);
  gap: var(--gap-col);
  align-items: start;
  padding-top: 32px;
}

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

.sidebar-left .page-layout {
  grid-template-columns: var(--side-col) minmax(0, var(--body-col));
}

.sidebar-left .page-layout > .main-column,
.sidebar-left .page-layout > .content-column {
  order: 2;
}

.sidebar-left .page-layout > aside {
  order: 1;
}

/* 页脚 */
.site-footer {
  margin-top: 8px;
  border-top: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-soft);
  font-size: 14px;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(4, minmax(0, 1fr));
  gap: 32px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 40px 24px 28px;
}

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

.footer-name {
  color: var(--ink);
  font-size: 17px;
  font-weight: 700;
}

.footer-desc {
  margin-top: 8px;
  max-width: 34em;
  color: var(--ink-soft);
  font-size: 13.5px;
  line-height: 1.7;
}

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

.footer-title {
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.footer-group ul li + li {
  margin-top: 6px;
}

.footer-group ul li a {
  display: inline-block;
  padding: 2px 0;
  color: var(--ink-soft);
  font-size: 13.5px;
  line-height: 1.6;
}

.footer-group ul li a:hover,
.footer-group ul li a:focus-visible {
  color: var(--accent);
}

.footer-bottom {
  border-top: 1px solid var(--line);
}

.footer-bottom p {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px 24px 22px;
  color: var(--ink-faint);
  font-size: 13px;
  line-height: 1.7;
}

/* ==========================================================================
   components · 通用模块
   ========================================================================== */

/* 区块标题 */
.section-head {
  margin-bottom: 20px;
}

.section-head h2 {
  font-size: 22px;
}

.section-head p {
  max-width: 62em;
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 15px;
}

.content-section + .content-section,
.section + .section {
  margin-top: 44px;
}

.content-section > h2,
.section > h2 {
  font-size: 22px;
}

.content-section > p,
.section-lead {
  max-width: 62em;
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 15px;
}

.section-more {
  margin-top: 16px;
  font-size: 15px;
}

.section-more a {
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid var(--line-strong);
}

.section-more a:hover {
  border-bottom-color: var(--accent);
}

.section-next {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 15px;
}

.section-next a {
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid var(--line-strong);
}

.section-next a:hover {
  border-bottom-color: var(--accent);
}

/* 编号与字段名 */
.need-no,
.direction-no,
.stage-no,
.entry-index,
.item-no,
.stage-item .stage-no,
.field,
.related-links-label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: .02em;
}

/* 图片容器 */
figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  background: var(--surface);
  object-fit: cover;
}

figcaption {
  margin-top: 8px;
  color: var(--ink-faint);
  font-size: 13px;
  line-height: 1.6;
}

.hero-figure {
  margin-top: 26px;
}

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

.content-media {
  margin-top: 32px;
}

.content-media img {
  aspect-ratio: 16 / 7;
}

.section-media {
  margin: 20px 0 24px;
}

.section-media img {
  aspect-ratio: 16 / 8;
}

.media-figure {
  margin: 20px 0 24px;
}

.media-figure img {
  aspect-ratio: 16 / 7;
}

.faq-figure {
  margin: 20px 0 24px;
}

.faq-figure img {
  aspect-ratio: 16 / 7;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  border-color: var(--accent-deep);
  background: var(--accent-deep);
  color: #fff;
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

/* 相关内容栏（aside） */
.related-column,
.related-sidebar,
.inner-aside {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.related-title,
.aside-title {
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 15px;
  font-weight: 600;
}

.related-list li,
.aside-list li {
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.related-list li:last-child,
.aside-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.related-list li a,
.aside-list li a {
  display: inline-block;
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.6;
}

.related-list li a:hover,
.aside-list li a:hover {
  color: var(--accent-deep);
  text-decoration: underline;
}

.related-list li p {
  margin-top: 4px;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.65;
}

/* 内页顶部横向相关链接（process） */
.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  margin-top: 36px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.related-links-label {
  color: var(--ink-soft);
}

.related-links-item {
  display: inline-block;
  padding: 3px 0;
  border-bottom: 1px solid var(--line-strong);
  font-size: 14px;
}

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

/* ==========================================================================
   pages · 首页
   ========================================================================== */

/* 首屏需求判断区 */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  padding: 40px 0 8px;
  border-bottom: 1px solid var(--line);
}

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

.hero-title {
  font-size: 34px;
  font-weight: 700;
}

.hero-lead {
  max-width: 34em;
  margin-top: 14px;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.7;
}

.hero-note {
  max-width: 36em;
  margin-top: 12px;
  color: var(--ink-soft);
  font-size: 15px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.hero-toc {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.hero-toc .toc-title {
  margin-bottom: 10px;
}

.toc-list {
  counter-reset: toc;
}

.toc-list li {
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.toc-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

/* 常见需求归拢 */
.needs {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

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

.need-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) 150px 96px;
  gap: 16px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.need-desc {
  min-width: 0;
  font-size: 15px;
}

.need-map {
  color: var(--ink-soft);
  font-size: 13.5px;
}

.need-link {
  justify-self: end;
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid var(--line-strong);
  font-size: 14px;
  white-space: nowrap;
}

.need-link:hover {
  border-bottom-color: var(--accent);
}

/* 服务方向总览 */
.directions {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

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

.direction-item {
  display: grid;
  grid-template-columns: 46px 200px minmax(0, 1fr) 96px;
  gap: 16px;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

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

.direction-scene {
  min-width: 0;
  color: var(--ink-soft);
  font-size: 14.5px;
}

.direction-link {
  justify-self: end;
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid var(--line-strong);
  font-size: 14px;
  white-space: nowrap;
}

.direction-link:hover {
  border-bottom-color: var(--accent);
}

/* 合作流程四阶段预览 */
.stages {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

.stage-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.stage-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper);
}

.stage-card:hover {
  border-color: var(--line-strong);
}

.stage-card .stage-name {
  margin-top: 8px;
  font-size: 17px;
}

.stage-point {
  flex: 1 1 auto;
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.7;
}

.stage-link {
  align-self: flex-start;
  margin-top: 14px;
  padding: 4px 0;
  border-bottom: 1px solid var(--line-strong);
  font-size: 14px;
}

.stage-link:hover {
  border-bottom-color: var(--accent);
}

/* 交付范围与验收口径摘要 */
.delivery {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

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

.delivery-col {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.col-title {
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
}

.delivery-list li {
  position: relative;
  padding: 7px 0 7px 16px;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.7;
}

.delivery-list li::before {
  content: "";
  position: absolute;
  top: 17px;
  left: 0;
  width: 6px;
  height: 1px;
  background: var(--accent);
}

/* 排错与支持入口 */
.support {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

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

.support-group {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.group-name {
  margin-bottom: 10px;
  font-size: 16px;
}

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

.support-list li a {
  display: inline-block;
  padding: 3px 0;
  color: var(--accent);
  font-size: 14px;
  line-height: 1.6;
}

.support-list li a:hover {
  color: var(--accent-deep);
  text-decoration: underline;
}

/* 站内栏目索引 */
.sitemap {
  padding: 40px 0 8px;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 20px;
}

.sitemap-col {
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.sitemap-col .col-title {
  margin-bottom: 8px;
  padding-bottom: 8px;
  font-size: 15px;
}

.sitemap-col p {
  color: var(--ink-soft);
  font-size: 13.5px;
  line-height: 1.65;
}

.sitemap-col a {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 0;
  border-bottom: 1px solid var(--line-strong);
  font-size: 14px;
}

.sitemap-col a:hover {
  border-bottom-color: var(--accent);
}

/* ==========================================================================
   pages · 服务方向（service）
   ========================================================================== */

.dimension-list {
  margin-top: 20px;
  border-top: 1px solid var(--line);
}

.dimension-item {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

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

.dimension-item dd {
  margin: 0;
  min-width: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

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

.direction-entry h3 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 18px;
}

.entry-body {
  margin-top: 10px;
}

.entry-scene,
.entry-advice {
  min-width: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

.entry-advice {
  margin-top: 8px;
}

.not-applicable-list {
  margin-top: 20px;
  border-top: 1px solid var(--line);
}

.not-applicable-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.na-desc {
  font-size: 15px;
}

.na-path {
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 14.5px;
}

.na-path a {
  border-bottom: 1px solid var(--line-strong);
}

.na-path a:hover {
  border-bottom-color: var(--accent);
}

/* ==========================================================================
   pages · 合作流程（process）
   ========================================================================== */

/* 该页 page-layout 为外层容器，main 与 aside 平级 */
.page-layout.layout-shell {
  grid-template-columns: minmax(0, var(--body-col)) var(--side-col);
}

.layout-shell > .inner-main {
  width: auto;
  max-width: none;
  margin: 0;
  padding: 0;
}

.process-overview > h2,
.process-duties > h2,
.process-checkpoints > h2 {
  font-size: 22px;
}

.process-overview > p,
.process-duties > p,
.process-checkpoints > p {
  max-width: 62em;
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 15px;
}

.process-duties,
.process-checkpoints {
  margin-top: 44px;
}

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

.stage-item {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.stage-item .stage-no {
  color: var(--ink-faint);
}

.stage-item .stage-name {
  margin-top: 6px;
  font-size: 16px;
}

.stage-node {
  flex: 1 1 auto;
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.7;
}

.stage-item a {
  align-self: flex-start;
  margin-top: 12px;
  padding: 3px 0;
  border-bottom: 1px solid var(--line-strong);
  font-size: 14px;
}

.stage-item a:hover {
  border-bottom-color: var(--accent);
}

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

.duty-block h3 {
  font-size: 18px;
}

.duty-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  margin-top: 12px;
}

.duty-col {
  min-width: 0;
}

.duty-col h4 {
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
}

.duty-col ul li {
  position: relative;
  padding: 6px 0 6px 14px;
  font-size: 14.5px;
  line-height: 1.7;
}

.duty-col ul li::before {
  content: "";
  position: absolute;
  top: 16px;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line-strong);
}

.duty-col-client ul li::before {
  background: var(--accent);
}

.duty-col-site ul li::before {
  background: var(--blue);
}

.checkpoint-steps {
  margin-top: 20px;
  border-top: 1px solid var(--line);
}

.checkpoint-step {
  display: grid;
  grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.checkpoint-step h3 {
  font-size: 16px;
}

.step-action,
.step-output {
  min-width: 0;
  font-size: 14.5px;
  line-height: 1.75;
}

.step-action {
  color: var(--ink);
}

.step-output {
  grid-column: 2;
  color: var(--ink-soft);
}

/* ==========================================================================
   pages · 交付范围（scope）
   ========================================================================== */

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

.item-block h3 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 18px;
}

.item-detail {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 6px 20px;
  margin-top: 12px;
}

.item-detail dt {
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
}

.item-detail dd {
  margin: 0 0 8px;
  min-width: 0;
  font-size: 14.5px;
  line-height: 1.75;
}

.acceptance-list,
.boundary-list {
  margin-top: 20px;
  border-top: 1px solid var(--line);
}

.acceptance-item,
.boundary-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.acceptance-item h3,
.boundary-item h3 {
  font-size: 16px;
}

.acceptance-item p,
.boundary-item p {
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ==========================================================================
   pages · 问题解答（faq）
   ========================================================================== */

.faq-categories > h2,
.faq-group > h2,
.faq-fallback > h2 {
  font-size: 22px;
}

.section-intro {
  max-width: 62em;
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 15px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.category-item {
  min-width: 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.category-item h3 {
  font-size: 16px;
}

.category-item h3 a {
  display: inline-block;
  padding: 2px 0;
}

.category-item p {
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.7;
}

.faq-group {
  margin-top: 44px;
}

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

.faq-item summary {
  position: relative;
  display: block;
  padding: 15px 34px 15px 0;
  color: var(--ink);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after {
  content: "展开";
  position: absolute;
  top: 17px;
  right: 0;
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
}

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

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

.faq-body {
  padding: 2px 0 18px;
}

.faq-symptom,
.faq-cause {
  min-width: 0;
  font-size: 14.5px;
  line-height: 1.75;
}

.faq-symptom {
  color: var(--ink);
}

.faq-cause {
  margin-top: 8px;
  color: var(--ink-soft);
}

.faq-symptom .field,
.faq-cause .field {
  display: inline-block;
  min-width: 62px;
  margin-right: 8px;
  color: var(--accent);
}

.faq-steps {
  margin-top: 10px;
  padding-left: 0;
  counter-reset: faq-step;
}

.faq-steps li {
  position: relative;
  padding: 5px 0 5px 30px;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.75;
  counter-increment: faq-step;
}

.faq-steps li::before {
  content: counter(faq-step);
  position: absolute;
  top: 7px;
  left: 0;
  width: 20px;
  height: 20px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 18px;
  text-align: center;
}

.faq-fallback {
  margin-top: 44px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.faq-fallback > p {
  max-width: 62em;
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 15px;
}

.fallback-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin-top: 14px;
}

.fallback-links li a {
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid var(--line-strong);
  font-size: 15px;
}

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

/* ==========================================================================
   pages · 404
   ========================================================================== */

.error-main {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 72px;
}

.error-hero {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--line);
}

.error-code {
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .06em;
}

.error-title {
  margin-top: 10px;
  font-size: 30px;
  font-weight: 700;
}

.error-summary {
  max-width: 46em;
  margin-top: 12px;
  color: var(--ink-soft);
  font-size: 16px;
}

.error-home-link {
  display: inline-block;
  margin-top: 20px;
  padding: 4px 0;
  border-bottom: 1px solid var(--line-strong);
  font-size: 15px;
}

.error-home-link:hover {
  border-bottom-color: var(--accent);
}

.error-routes {
  padding: 36px 0 0;
}

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

.section-desc {
  max-width: 62em;
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 15px;
}

.error-route-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}

.error-route-item {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.error-route-item a {
  display: flex;
  align-items: center;
  min-height: 56px;
  padding: 14px 18px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
}

.error-route-item a:hover,
.error-route-item a:focus-visible {
  color: var(--accent);
}

/* ==========================================================================
   responsive
   ========================================================================== */

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

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

  .sidebar-left .page-layout > .main-column,
  .sidebar-left .page-layout > .content-column,
  .sidebar-left .page-layout > aside {
    order: 0;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }

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

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

  .need-item {
    grid-template-columns: 40px minmax(0, 1fr) 130px;
  }

  .need-item .need-link {
    grid-column: 2 / -1;
    justify-self: start;
  }

  .direction-item {
    grid-template-columns: 40px 180px minmax(0, 1fr);
  }

  .direction-item .direction-link {
    grid-column: 2 / -1;
    justify-self: start;
  }

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

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

@media (max-width: 768px) {
  body.site-body {
    font-size: 15.5px;
  }

  .fact-bar p {
    padding: 8px 16px;
    font-size: 12.5px;
  }

  .header-inner {
    padding: 12px 16px;
  }

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

  .nav-toggle::before {
    content: "菜单";
  }

  .nav-toggle[aria-expanded="true"]::before {
    content: "收起";
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    box-shadow: 0 10px 22px rgba(35, 40, 45, .08);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 16px 14px;
  }

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

  .nav-item > a {
    min-height: 46px;
    padding: 0 4px;
    border-bottom: 1px solid var(--line);
    border-left: 2px solid transparent;
  }

  .nav-item > a.is-current {
    border-bottom-color: var(--line);
    border-left-color: var(--accent);
    padding-left: 10px;
  }

  .nav-sub {
    position: static;
    display: block;
    min-width: 0;
    padding: 0 0 6px;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .nav-sub li a {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 0 4px 0 18px;
    border-bottom: 1px solid var(--line);
  }

  .home-main,
  .inner-main,
  .error-main {
    padding: 0 16px 56px;
  }

  .breadcrumb {
    padding-top: 16px;
    font-size: 13px;
  }

  .page-header {
    padding: 12px 0 20px;
  }

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

  .page-description {
    font-size: 15px;
  }

  .page-toc {
    padding: 12px 14px;
  }

  .page-toc ul,
  .page-toc ol {
    gap: 4px 18px;
  }

  .page-layout {
    padding-top: 24px;
    gap: 28px;
  }

  .hero {
    padding: 28px 0 4px;
  }

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

  .hero-lead {
    font-size: 16px;
  }

  .hero-toc {
    padding: 16px;
  }

  .section-head h2,
  .content-section > h2,
  .section > h2,
  .process-overview > h2,
  .process-duties > h2,
  .process-checkpoints > h2,
  .faq-categories > h2,
  .faq-group > h2,
  .faq-fallback > h2,
  .section-title {
    font-size: 19px;
  }

  .needs,
  .directions,
  .stages,
  .delivery,
  .support,
  .sitemap {
    padding: 28px 0;
  }

  .need-item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 8px 12px;
    align-items: start;
  }

  .need-map {
    grid-column: 2;
  }

  .need-item .need-link {
    grid-column: 2;
  }

  .direction-item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 8px 12px;
    align-items: start;
  }

  .direction-scene {
    grid-column: 2;
  }

  .direction-item .direction-link {
    grid-column: 2;
  }

  .stage-grid,
  .stage-strip,
  .support-groups,
  .sitemap-grid,
  .category-grid,
  .error-route-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .checkpoint-step {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .step-output {
    grid-column: 1;
  }

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

  .item-detail dd {
    margin-bottom: 10px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 30px 16px 22px;
  }

  .footer-bottom p {
    padding: 14px 16px 20px;
  }

  .error-hero {
    padding: 36px 0 24px;
  }

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

@media (max-width: 420px) {
  .hero-actions .btn {
    flex: 1 1 auto;
  }

  .related-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .faq-symptom .field,
  .faq-cause .field {
    display: block;
    min-width: 0;
    margin: 0 0 2px;
  }
}

/* ==========================================================================
   动效增强（不影响初始可见性）
   ========================================================================== */

@media (prefers-reduced-motion: no-preference) {
  .stage-card,
  .stage-item,
  .support-group,
  .sitemap-col,
  .category-item,
  .error-route-item {
    transition: border-color .2s ease, box-shadow .2s ease;
  }

  .stage-card:hover,
  .stage-item:hover,
  .support-group:hover,
  .sitemap-col:hover,
  .category-item:hover,
  .error-route-item:hover {
    border-color: var(--line-strong);
    box-shadow: 0 2px 10px rgba(35, 40, 45, .05);
  }
}