/* ==========================================================================
   天美官网 · 全站样式
   base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base
   -------------------------------------------------------------------------- */

:root {
  --ink: #14171A;
  --paper: #F6F3ED;
  --accent: #D9480F;
  --tint: #F5DED3;
  --muted: #5B6169;
  --footer-bg: #EDE8DE;
  --line: #14171A;
  --hairline: #C9C2B6;
  --white: #FFFDFA;
  --radius: 2px;
  --shell: 1180px;
  --gutter: 32px;
  --header-h: 72px;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
}

p {
  margin: 0;
}

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

dl,
dd,
dt {
  margin: 0;
}

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover,
a:focus-visible {
  color: var(--accent);
  text-decoration-thickness: 2px;
}

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

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

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

figure {
  margin: 0;
}

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

/* --------------------------------------------------------------------------
   layout · 全站骨架
   -------------------------------------------------------------------------- */

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--paper);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--paper);
  border-bottom: 2px solid var(--line);
}

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  flex: 0 0 auto;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  text-decoration: none;
  padding: 6px 10px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

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

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

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

.nav-item > a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 10px;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.nav-item > a:hover,
.nav-item > a:focus-visible {
  color: var(--accent);
  text-decoration: none;
}

.nav-item.is-current > a,
.nav-item > a.is-current {
  border-bottom-color: var(--accent);
  font-weight: 700;
}

.header-cta {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  background: var(--ink);
  color: var(--white);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.header-cta:hover,
.header-cta:focus-visible {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
  text-decoration: none;
}

.header-cta-arrow {
  font-size: 14px;
  line-height: 1;
}

.menu-toggle {
  display: none;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  padding: 0;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

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

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

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

.home-main {
  width: 100%;
}

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

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

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

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

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

/* 页面标题区 */
.page-header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--line);
}

.page-title {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.22;
  color: var(--ink);
}

/* 内页通用 */
.inner-main p {
  color: var(--ink);
}

.section {
  padding: 56px 0;
  border-top: 2px solid var(--line);
}

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

.section-title {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
}

.section-desc {
  margin-top: 10px;
  font-size: 16px;
  color: var(--muted);
  max-width: 720px;
}

.section-lead {
  margin-top: 10px;
  font-size: 16px;
  color: var(--muted);
  max-width: 720px;
}

.section-intro {
  margin-top: 10px;
  font-size: 16px;
  color: var(--muted);
  max-width: 720px;
}

.section-footnote {
  margin-top: 24px;
  font-size: 15px;
  color: var(--muted);
}

.section-footnote a {
  color: var(--ink);
  font-weight: 700;
}

/* 页脚 */
.site-footer {
  background: var(--footer-bg);
  border-top: 2px solid var(--line);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px var(--gutter) 32px;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(0, 2fr);
  gap: 32px 48px;
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.footer-brand-line {
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
  max-width: 280px;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(0, 1.4fr);
  gap: 24px 32px;
}

.footer-group-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 12px;
}

.footer-links li + li {
  margin-top: 8px;
}

.footer-links a {
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

.footer-about-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.footer-bottom {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px var(--gutter) 28px;
  border-top: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-copy {
  font-size: 13px;
  color: var(--muted);
}

.footer-top-link {
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 1px;
}

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

/* --------------------------------------------------------------------------
   components · 通用组件
   -------------------------------------------------------------------------- */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  transition: background-color 120ms linear, color 120ms linear, border-color 120ms linear;
}

.btn-primary {
  background: var(--ink);
  color: var(--white);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
  text-decoration: none;
}

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

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

/* 箭头链接 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--ink);
}

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

.link-arrow span:last-child {
  font-size: 15px;
}

/* 文本链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

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

.inline-link {
  display: inline-block;
  min-height: 44px;
  line-height: 44px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

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

/* 分类筛选条 */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.filter-btn {
  min-height: 44px;
  padding: 0 16px;
  font-size: 15px;
  color: var(--ink);
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  border-left-width: 2px;
}

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

.filter-btn.is-active {
  background: var(--tint);
  border-left: 4px solid var(--accent);
  padding-left: 14px;
  font-weight: 700;
}

/* 字段标签与值 */
.field-label {
  display: block;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 4px;
}

.field-value {
  display: block;
  font-size: 16px;
  color: var(--ink);
  line-height: 1.65;
}

/* 元信息标签 */
.meta-tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  font-size: 13px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* 图片容器 */
.hero-media,
.delivery-figure,
.focus-media,
.process-figure,
.section-figure,
.content-figure,
.contact-figure,
.positioning-figure {
  border: 2px solid var(--line);
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
}

.hero-media img,
.delivery-figure img,
.focus-media img,
.process-figure img,
.section-figure img,
.content-figure img,
.contact-figure img,
.positioning-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

.media-caption,
.figure-caption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--hairline);
  background: var(--white);
}

/* 折叠问答 */
.faq-item {
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.faq-item + .faq-item {
  margin-top: 12px;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  padding: 12px 16px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  flex: 0 0 auto;
  width: 24px;
  text-align: center;
  font-size: 22px;
  line-height: 1;
  color: var(--accent);
}

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

.faq-answer {
  padding: 0 16px 18px;
  border-top: 1px solid var(--hairline);
}

.faq-answer p {
  margin-top: 12px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
}

/* 编号有序列表 */
.checklist,
.prep-list {
  counter-reset: step;
}

.prep-item {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hairline);
}

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

.prep-index {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: 15px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
}

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

.prep-name {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.prep-text {
  margin-top: 6px;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.7;
}

/* 下一步列表（多个内页共用） */
.next-list {
  display: grid;
  gap: 12px;
}

.next-item > a,
.next-link {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 56px;
  padding: 14px 18px;
  background: var(--white);
  border: 2px solid var(--line);
  border-left-width: 2px;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
}

.next-item > a:hover,
.next-item > a:focus-visible,
.next-link:hover,
.next-link:focus-visible {
  border-left-width: 4px;
  border-left-color: var(--accent);
  color: var(--ink);
  text-decoration: none;
}

.next-name {
  flex: 0 0 auto;
  font-size: 16px;
  font-weight: 700;
}

.next-desc {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 14px;
  color: var(--muted);
}

.next-arrow {
  flex: 0 0 auto;
  font-size: 15px;
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */

.hero {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px var(--gutter) 64px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

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

.hero-kicker {
  display: inline-block;
  padding: 4px 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--tint);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  margin-bottom: 18px;
}

.hero-title {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.18;
  color: var(--ink);
}

.hero-lead {
  margin-top: 18px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 560px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.hero-facts {
  margin-top: 32px;
  border-top: 2px solid var(--line);
}

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

.fact-index {
  flex: 0 0 auto;
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.fact-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

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

.hero-media img {
  aspect-ratio: 4 / 3;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 服务方向总览 */
.directions {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px var(--gutter);
  border-top: 2px solid var(--line);
}

.direction-list {
  border-top: 2px solid var(--line);
}

.direction-row {
  display: grid;
  grid-template-columns: minmax(160px, 1.1fr) minmax(0, 1.9fr) minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 20px 24px;
  padding: 18px 12px 18px 14px;
  border-bottom: 1px solid var(--hairline);
  border-left: 2px solid transparent;
  transition: border-left-color 120ms linear;
}

.direction-row:hover {
  border-left-color: var(--accent);
}

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

.direction-name .field-value {
  font-size: 17px;
  font-weight: 700;
}

/* 主推荐与次推荐 */
.recommend {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px var(--gutter);
  border-top: 2px solid var(--line);
}

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

.recommend-primary {
  grid-column: 1 / -1;
  padding: 28px;
  background: var(--white);
  border: 2px solid var(--line);
  border-left: 6px solid var(--accent);
  border-radius: var(--radius);
}

.recommend-tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  background: var(--tint);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
}

.recommend-title {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.35;
}

.recommend-desc {
  margin-top: 10px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 720px;
}

.recommend-points {
  margin: 16px 0 20px;
  display: grid;
  gap: 8px;
}

.recommend-points li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.recommend-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 2px;
  background: var(--accent);
}

.recommend-secondary {
  padding: 24px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.recommend-secondary .recommend-title {
  font-size: 19px;
}

.recommend-secondary .recommend-desc {
  margin-top: 0;
  font-size: 15px;
  flex: 1 1 auto;
}

.recommend-secondary .link-arrow {
  align-self: flex-start;
}

/* 交付资源摘要 */
.delivery-brief {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px var(--gutter);
  border-top: 2px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 40px;
  align-items: start;
}

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

.delivery-desc {
  margin-top: 12px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 520px;
}

.delivery-notes {
  margin-top: 20px;
  display: grid;
  gap: 10px;
}

.delivery-notes li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.delivery-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 2px;
  background: var(--accent);
}

.delivery-media {
  min-width: 0;
  display: grid;
  gap: 20px;
}

.file-sample-list {
  border-top: 2px solid var(--line);
}

.file-sample {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.7fr) minmax(0, 0.7fr) minmax(0, 1.4fr);
  gap: 8px 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--hairline);
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}

.file-name {
  font-weight: 700;
}

.file-format {
  color: var(--muted);
}

.file-version {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.file-usage {
  color: var(--muted);
}

.delivery-figure img {
  aspect-ratio: 16 / 10;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 协作节点条 */
.node-strip {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px var(--gutter);
  border-top: 2px solid var(--line);
}

.node-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.node-item {
  padding: 18px 16px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.node-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 12px;
  font-size: 15px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--white);
  background: var(--ink);
  border-radius: var(--radius);
}

.node-name {
  display: block;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.node-output {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

/* 常见问题摘要 */
.faq-brief {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px var(--gutter);
  border-top: 2px solid var(--line);
}

.faq-list {
  max-width: 860px;
}

/* 合作启动区 */
.start-block {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px var(--gutter);
  border-top: 2px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

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

.start-desc {
  margin-top: 12px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 520px;
}

.start-checklist {
  min-width: 0;
  padding: 24px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.start-checklist-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
}

.checklist-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--hairline);
}

.checklist-name {
  flex: 0 0 auto;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.checklist-hint {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.65;
}

.start-checklist .link-arrow {
  margin-top: 18px;
}

/* 相关内容导航 */
.related-links {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 24px var(--gutter) 56px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  border-top: 2px solid var(--line);
}

.related-links-label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.related-links-item {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
}

.related-links-item:hover,
.related-links-item:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   pages · 服务能力
   -------------------------------------------------------------------------- */

.page-hero {
  margin-bottom: 40px;
}

.page-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: start;
}

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

.page-hero-lead {
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 720px;
}

.page-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.capability-ledger {
  padding: 40px 0;
  border-top: 2px solid var(--line);
}

.ledger-list {
  border-top: 2px solid var(--line);
}

.ledger-row {
  display: grid;
  grid-template-columns: minmax(150px, 1fr) minmax(0, 1.9fr) minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 20px 24px;
  padding: 18px 12px 18px 14px;
  border-bottom: 1px solid var(--hairline);
  border-left: 2px solid transparent;
  transition: border-left-color 120ms linear;
}

.ledger-row:hover {
  border-left-color: var(--accent);
}

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

.ledger-name .field-value {
  font-size: 17px;
  font-weight: 700;
}

.scope-compare {
  padding: 48px 0;
  border-top: 2px solid var(--line);
}

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

.scope-col {
  padding: 24px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.scope-in {
  border-top: 6px solid var(--accent);
}

.scope-out {
  border-top: 6px solid var(--muted);
}

.scope-col-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 14px;
}

.scope-list {
  display: grid;
  gap: 10px;
}

.scope-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 2px;
  background: var(--accent);
}

.scope-out .scope-list li::before {
  background: var(--muted);
}

.focus-directions {
  padding: 48px 0;
  border-top: 2px solid var(--line);
}

.focus-media {
  margin-bottom: 24px;
}

.focus-media img {
  aspect-ratio: 16 / 7;
  width: 100%;
  height: auto;
  object-fit: cover;
}

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

.focus-block {
  padding: 24px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.focus-title {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
}

.focus-block p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.focus-block p + p {
  margin-top: 10px;
}

.focus-points {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--hairline);
  display: grid;
  gap: 8px;
}

.focus-points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.focus-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 2px;
  background: var(--accent);
}

.next-steps {
  padding: 48px 0 0;
  border-top: 2px solid var(--line);
}

/* --------------------------------------------------------------------------
   pages · 合作流程
   -------------------------------------------------------------------------- */

.page-head {
  margin-bottom: 40px;
}

.page-head-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: start;
}

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

.page-lead {
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 720px;
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.node-section {
  padding: 40px 0;
  border-top: 2px solid var(--line);
}

.node-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--hairline);
}

.node-row .node-index {
  width: 48px;
  height: 48px;
  margin: 0;
  font-size: 18px;
}

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

.node-row .node-name {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
}

.node-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px 24px;
}

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

.node-field dt {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 4px;
}

.node-field dd {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.process-figure {
  margin: 32px 0;
}

.process-figure img {
  aspect-ratio: 16 / 7;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.prep-section {
  padding: 40px 0;
  border-top: 2px solid var(--line);
}

.blocker-section {
  padding: 40px 0;
  border-top: 2px solid var(--line);
}

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

.blocker-item {
  padding: 20px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.blocker-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.blocker-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.next-section {
  padding: 40px 0 0;
  border-top: 2px solid var(--line);
}

/* --------------------------------------------------------------------------
   pages · 交付标准（左侧栏）
   -------------------------------------------------------------------------- */

.page-layout {
  display: grid;
  gap: 40px;
  align-items: start;
}

.page-layout.sidebar-left {
  grid-template-columns: minmax(220px, 260px) minmax(0, 1fr);
}

.page-layout.sidebar-right {
  grid-template-columns: minmax(0, 1fr) minmax(220px, 280px);
}

/* 左侧栏可能出现在 body / 祖先节点上 */
.sidebar-left .page-layout {
  grid-template-columns: minmax(220px, 260px) minmax(0, 1fr);
}

.content-aside {
  min-width: 0;
  padding: 20px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.aside-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.aside-note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 16px;
}

.res-index {
  border-top: 1px solid var(--hairline);
}

.res-index-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--hairline);
}

.res-index-link {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
}

.res-index-link:hover,
.res-index-link:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

.res-index-count {
  flex: 0 0 auto;
  font-size: 13px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.aside-extra {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 2px solid var(--line);
}

.aside-extra-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 8px;
}

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

.content-section {
  padding: 32px 0;
  border-top: 2px solid var(--line);
}

.content-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.content-main .page-header {
  margin-bottom: 24px;
}

.section-figure {
  margin: 20px 0;
}

.section-figure img {
  aspect-ratio: 16 / 7;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.table-wrap {
  margin-top: 20px;
  overflow-x: auto;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.data-table {
  min-width: 560px;
  font-size: 15px;
}

.table-caption {
  padding: 12px 16px;
  text-align: left;
  font-size: 13px;
  color: var(--muted);
  border-bottom: 1px solid var(--hairline);
}

.data-table thead th {
  padding: 12px 16px;
  text-align: left;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: var(--tint);
  border-bottom: 2px solid var(--line);
  white-space: nowrap;
}

.data-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--hairline);
  vertical-align: top;
  line-height: 1.65;
}

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

.cell-name {
  font-weight: 700;
}

.cell-version {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  white-space: nowrap;
}

.cell-use {
  color: var(--muted);
}

.table-note {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.rule-columns {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.rule-col {
  min-width: 0;
  padding: 20px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.rule-col-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

.rule-item {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.rule-item + .rule-item {
  margin-top: 10px;
}

.rule-item::before {
  counter-increment: rule;
  content: counter(rule) ".";
  position: absolute;
  left: 0;
  top: 0;
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.accept-list {
  margin-top: 20px;
  display: grid;
  gap: 16px;
}

.accept-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding: 18px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.accept-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 15px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
}

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

.accept-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.accept-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.accept-change {
  margin-top: 24px;
  padding: 20px;
  background: var(--tint);
  border: 2px solid var(--line);
  border-left: 6px solid var(--accent);
  border-radius: var(--radius);
}

.accept-change-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.accept-change-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  max-width: 720px;
}

.next-step {
  padding-bottom: 0;
}

.next-links {
  margin-top: 20px;
  display: grid;
  gap: 10px;
}

.next-link-item {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  align-items: center;
  gap: 16px;
}

.next-link-item .next-link {
  min-height: 44px;
  padding: 10px 16px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  font-weight: 700;
  text-decoration: none;
  color: var(--ink);
}

.next-link-item .next-link:hover,
.next-link-item .next-link:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.next-link-desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
  min-width: 0;
}

/* --------------------------------------------------------------------------
   pages · 常见问题（右侧栏）
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
}

.page-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: start;
  margin-bottom: 32px;
}

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

.page-heading-lead {
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 720px;
}

.page-heading-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

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

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

.content-figure {
  margin-bottom: 24px;
}

.content-figure img {
  aspect-ratio: 16 / 7;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.content-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--hairline);
  background: var(--white);
}

.faq-section {
  padding-top: 8px;
}

.faq-section > h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
}

.faq-section .faq-item {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.faq-link {
  display: inline-block;
  margin-top: 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.page-aside {
  min-width: 0;
  display: grid;
  gap: 20px;
  position: sticky;
  top: calc(var(--header-h) + 16px);
}

.aside-block {
  padding: 18px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.aside-index {
  display: grid;
  gap: 6px;
  border-top: 1px solid var(--hairline);
  padding-top: 10px;
}

.aside-index li {
  min-width: 0;
}

.aside-link {
  display: block;
  min-height: 36px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
  text-decoration: none;
}

.aside-link:hover,
.aside-link:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

.aside-note-list {
  display: grid;
  gap: 8px;
}

.aside-note-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.aside-note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 2px;
  background: var(--accent);
}

/* --------------------------------------------------------------------------
   pages · 关于与工作方式
   -------------------------------------------------------------------------- */

.page-head-body {
  margin-bottom: 40px;
}

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

.page-meta-tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  font-size: 13px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.section-positioning {
  padding-top: 40px;
  border-top: 2px solid var(--line);
}

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

.positioning-text {
  min-width: 0;
}

.positioning-text p {
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 560px;
}

.positioning-figure {
  min-width: 0;
}

.positioning-figure img {
  aspect-ratio: 4 / 3;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.section-workstyle {
  padding: 48px 0;
  border-top: 2px solid var(--line);
}

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

.workstyle-card {
  padding: 24px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.workstyle-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  margin-bottom: 12px;
  font-size: 16px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--white);
  background: var(--ink);
  border-radius: var(--radius);
}

.workstyle-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.workstyle-card p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.workstyle-card p + p {
  margin-top: 8px;
}

.section-boundary {
  padding: 48px 0;
  border-top: 2px solid var(--line);
}

.boundary-list {
  border-top: 2px solid var(--line);
}

.boundary-item {
  display: grid;
  grid-template-columns: minmax(160px, 0.7fr) minmax(0, 2fr);
  gap: 12px 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hairline);
}

.boundary-name {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.boundary-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  min-width: 0;
}

.section-next {
  padding: 48px 0 0;
  border-top: 2px solid var(--line);
}

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

.next-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 120px;
  padding: 24px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  min-width: 0;
}

.next-card:hover,
.next-card:focus-visible {
  border-left: 4px solid var(--accent);
  color: var(--ink);
  text-decoration: none;
}

.next-card-label {
  font-size: 18px;
  font-weight: 700;
}

.next-card-desc {
  flex: 1 1 auto;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.next-card-arrow {
  font-size: 15px;
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   pages · 联系合作
   -------------------------------------------------------------------------- */

.page-title-area {
  margin-bottom: 40px;
}

.page-title-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: start;
}

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

.page-meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.contact-prep {
  padding: 40px 0;
  border-top: 2px solid var(--line);
}

.contact-prep-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.prep-column,
.order-column {
  min-width: 0;
}

.prep-column > h2,
.order-column > h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 10px;
}

.prep-column .section-intro,
.order-column .section-intro {
  margin-bottom: 20px;
}

.prep-hint {
  margin-top: 4px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.order-list {
  display: grid;
  gap: 16px;
}

.order-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 18px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  align-items: start;
}

.order-index {
  grid-row: 1 / span 3;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 15px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
}

.order-name {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.order-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.order-item .inline-link {
  justify-self: start;
  min-height: 36px;
  line-height: 36px;
  font-size: 14px;
}

.contact-figure {
  margin: 8px 0 40px;
}

.contact-figure img {
  aspect-ratio: 16 / 6;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.contact-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--hairline);
  background: var(--white);
}

.entry-section {
  padding: 40px 0;
  border-top: 2px solid var(--line);
}

.entry-section > h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 10px;
}

.entry-section .section-intro {
  margin-bottom: 20px;
}

.entry-list {
  border-top: 2px solid var(--line);
}

.entry-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--hairline);
}

.entry-text {
  min-width: 0;
}

.entry-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 4px;
}

.entry-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.entry-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
}

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

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

.boundary-section {
  padding: 40px 0 0;
  border-top: 2px solid var(--line);
}

.boundary-section > h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}

.boundary-section .boundary-list {
  border-top: 2px solid var(--line);
}

.boundary-section .boundary-list li {
  padding: 12px 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  border-bottom: 1px solid var(--hairline);
}

.boundary-more {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */

.error-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 64px var(--gutter) 72px;
  width: 100%;
}

.error-hero {
  padding-bottom: 40px;
  border-bottom: 2px solid var(--line);
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.error-title {
  margin-top: 16px;
  font-size: 36px;
  font-weight: 700;
  line-height: 1.25;
}

.error-lead {
  margin-top: 14px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 620px;
}

.error-home-link {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  margin-top: 24px;
  padding: 0 20px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  background: var(--ink);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
}

.error-home-link:hover,
.error-home-link:focus-visible {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
  text-decoration: none;
}

.error-guide {
  padding-top: 40px;
}

.error-link-list {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.error-link-item {
  padding: 18px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.error-link-item a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.error-link-desc {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* 跳转链接 */
.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 60;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--white);
  font-size: 14px;
  text-decoration: none;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 12px;
  color: var(--white);
}

/* --------------------------------------------------------------------------
   responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1180px) {
  :root {
    --gutter: 24px;
  }

  .hero-title {
    font-size: 38px;
  }

  .footer-nav {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .footer-group.footer-about {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .header-inner {
    gap: 16px;
  }

  .menu-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: var(--header-h);
    padding: 0 var(--gutter) 16px;
    background: var(--paper);
    border-bottom: 2px solid var(--line);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: 8px;
  }

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

  .nav-item > a {
    display: flex;
    width: 100%;
    min-height: 48px;
    padding: 0 4px;
    border-bottom: 1px solid var(--hairline);
  }

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

  .header-cta {
    margin-left: auto;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding-top: 40px;
    padding-bottom: 48px;
  }

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

  .hero-lead {
    max-width: none;
  }

  .direction-row,
  .ledger-row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 14px 20px;
  }

  .direction-name,
  .ledger-name {
    grid-column: 1 / -1;
  }

  .delivery-brief,
  .start-block,
  .positioning-grid,
  .contact-prep-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .node-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .focus-grid,
  .blocker-grid,
  .scope-columns,
  .rule-columns,
  .next-grid,
  .error-link-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

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

  .page-layout.sidebar-left > .content-main,
  .sidebar-left .page-layout > .content-main {
    order: 1;
  }

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

  .page-aside {
    position: static;
  }

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --header-h: 60px;
  }

  body {
    font-size: 15px;
  }

  .header-inner {
    gap: 10px;
  }

  .brand {
    font-size: 17px;
    padding: 5px 8px;
  }

  .header-cta {
    min-height: 40px;
    padding: 0 12px;
    font-size: 14px;
  }

  .header-cta-text {
    display: none;
  }

  .header-cta-arrow {
    font-size: 16px;
  }

  .site-nav {
    top: var(--header-h);
  }

  .inner-main {
    padding-top: 16px;
    padding-bottom: 48px;
  }

  .page-title {
    font-size: 27px;
  }

  .page-header {
    margin-bottom: 20px;
    padding-bottom: 16px;
  }

  .section {
    padding: 36px 0;
  }

  .section-title {
    font-size: 21px;
  }

  .hero {
    padding-top: 28px;
    padding-bottom: 36px;
  }

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

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

  .hero-kicker {
    font-size: 12px;
  }

  .hero-actions .btn {
    flex: 1 1 100%;
  }

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

  .directions,
  .recommend,
  .delivery-brief,
  .node-strip,
  .faq-brief,
  .start-block {
    padding: 36px var(--gutter);
  }

  .related-links {
    padding: 20px var(--gutter) 40px;
  }

  .direction-row,
  .ledger-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
    padding: 16px 10px 16px 12px;
  }

  .direction-name,
  .ledger-name {
    grid-column: auto;
  }

  .filter-btn {
    padding: 0 12px;
    font-size: 14px;
  }

  .filter-btn.is-active {
    padding-left: 10px;
  }

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

  .recommend-primary,
  .recommend-secondary {
    padding: 20px;
  }

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

  .file-sample {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 4px 12px;
  }

  .file-name {
    grid-column: 1 / -1;
  }

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

  .node-item {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 4px 12px;
    align-items: center;
  }

  .node-item .node-index {
    grid-row: 1 / span 2;
    margin-bottom: 0;
  }

  .node-item .node-output {
    margin-top: 0;
  }

  .faq-question {
    font-size: 15px;
    padding: 12px 14px;
  }

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

  .faq-answer p {
    font-size: 15px;
  }

  .start-checklist {
    padding: 18px;
  }

  .checklist-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  .page-hero-inner,
  .page-head-row,
  .page-heading,
  .page-title-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

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

  .ledger-row:hover,
  .direction-row:hover {
    border-left-color: transparent;
  }

  .scope-col,
  .focus-block,
  .blocker-item,
  .rule-col,
  .workstyle-card,
  .next-card {
    padding: 18px;
  }

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

  .boundary-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 14px 0;
  }

  .node-row {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 14px;
    padding: 20px 0;
  }

  .node-row .node-index {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }

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

  .prep-item {
    gap: 12px;
  }

  .prep-index {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }

  .next-item > a,
  .next-link {
    flex-wrap: wrap;
    gap: 4px 12px;
    padding: 12px 14px;
  }

  .next-desc {
    flex-basis: 100%;
  }

  .content-aside {
    padding: 16px;
  }

  .accept-item {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 12px;
    padding: 16px;
  }

  .accept-num {
    width: 30px;
    height: 30px;
    font-size: 14px;
  }

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

  .next-link-item .next-link {
    justify-self: start;
  }

  .next-link-desc {
    padding-left: 2px;
  }

  .page-aside {
    gap: 16px;
  }

  .aside-block {
    padding: 16px;
  }

  .order-item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 4px 12px;
    padding: 16px;
  }

  .order-index {
    width: 30px;
    height: 30px;
    font-size: 14px;
  }

  .entry-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

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

  .error-main {
    padding-top: 40px;
    padding-bottom: 48px;
  }

  .error-code {
    font-size: 48px;
  }

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

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

  .footer-inner {
    padding: 32px var(--gutter) 24px;
    gap: 24px;
  }

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

  .footer-group.footer-about {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    padding: 14px var(--gutter) 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .data-table {
    min-width: 480px;
    font-size: 14px;
  }

  .data-table thead th,
  .data-table tbody td {
    padding: 10px 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .btn,
  .direction-row,
  .ledger-row {
    transition: none;
  }
}

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}