/* 官网独立展示标题仅用于首页；正文与辅助页面继续复用工作台五档字阶。
   原生 CSS 不支持 rpx，移动端按 375 设计宽的 2rpx = 1px 换算。 */
:root {
  --av5-color-primary: #245bdb;
  --av5-color-page: #f5f6f8;
  --av5-color-text: #1f2329;
  --av5-color-text-secondary: #646a73;
  --av5-color-text-muted: #6a7078;
  --av5-color-border: #e5e6eb;
  --av5-color-danger: #a8071a;
  --av5-color-danger-soft: #fff6f5;
  --av5-font-title: 18px;
  --av5-line-title: 26px;
  --av5-font-subtitle: 16px;
  --av5-line-subtitle: 22px;
  --av5-font-body: 14px;
  --av5-line-body: 20px;
  --av5-font-table: 13px;
  --av5-line-table: 18px;
  --av5-font-note: 12px;
  --av5-line-note: 17px;
  --av5-control-height: 40px;
  --av5-radius-control: 6px;
  --av5-radius-card: 10px;
  --av5-radius-floating: 8px;
  --av5-content-max: 1248px;
  --website-color-surface: #ffffff;
  --website-color-primary-soft: #eef3ff;
  --website-color-night: #0d1830;
  --website-color-night-end: #173354;
  --website-color-halo: #234871;
  --website-color-on-night: #f4f7fd;
  --website-color-on-night-secondary: #c7d2e4;
  --website-color-on-night-muted: #a9bcd4;
  --website-color-night-line: #3b5574;
  --website-color-night-panel: #142943;
  --website-color-link: #b7d3ff;
  --website-font-display: 32px;
  --website-line-display: 42px;
  --website-font-section: 26px;
  --website-line-section: 36px;
  --website-font-copy: 16px;
  --website-line-copy: 28px;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 24px; }
body {
  margin: 0;
  background: var(--av5-color-page);
  color: var(--av5-color-text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: var(--av5-font-body);
  line-height: var(--av5-line-body);
  overflow-wrap: anywhere;
}
a { color: var(--av5-color-primary); text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--av5-color-primary); outline-offset: 4px; }
h1, h2, h3, p, ul, ol { margin-top: 0; }
h1, h2 { margin-bottom: 16px; font-size: var(--av5-font-title); line-height: var(--av5-line-title); font-weight: 650; }
h3 { margin-bottom: 12px; font-size: var(--av5-font-subtitle); line-height: var(--av5-line-subtitle); font-weight: 600; }
p { margin-bottom: 16px; }
ul, ol { padding-left: 22px; }
li + li { margin-top: 8px; }
.container { width: min(calc(100% - 40px), var(--av5-content-max)); margin-inline: auto; }
.skip-link { position: absolute; top: 8px; left: 20px; z-index: 2; padding: 12px 16px; transform: translateY(-180%); background: var(--website-color-surface); border: 1px solid var(--av5-color-primary); border-radius: var(--av5-radius-control); }
.skip-link:focus { transform: translateY(0); }
.site-header { background: var(--website-color-surface); border-bottom: 1px solid var(--av5-color-border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px 24px; padding-block: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--av5-color-text); text-decoration: none; }
.brand-mark { display: grid; place-items: center; flex: none; width: 36px; height: 36px; border-radius: var(--av5-radius-control); background: var(--av5-color-primary); color: var(--website-color-surface); font-size: var(--av5-font-subtitle); line-height: var(--av5-line-subtitle); font-weight: 600; }
.brand-name { font-size: var(--av5-font-title); line-height: var(--av5-line-title); font-weight: 650; }
.site-nav { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 20px; }
.site-nav > a:not(.button) { display: inline-flex; align-items: center; min-height: 40px; color: var(--av5-color-text-secondary); text-decoration: none; }
.site-nav > a[aria-current='page'] { color: var(--av5-color-primary); text-decoration: underline; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: var(--av5-control-height); padding: 10px 18px; border: 1px solid var(--av5-color-primary); border-radius: var(--av5-radius-control); color: var(--av5-color-primary); background: transparent; font-size: var(--av5-font-body); line-height: var(--av5-line-body); font-weight: 500; text-decoration: none; text-align: center; }
.button-primary { background: var(--av5-color-primary); color: var(--website-color-surface); }
.button:hover { text-decoration: underline; }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-block: 24px 16px; }
.eyebrow { margin-bottom: 14px; color: var(--av5-color-primary); font-size: var(--av5-font-table); line-height: var(--av5-line-table); font-weight: 600; letter-spacing: .06em; }
.note { margin-bottom: 0; color: var(--av5-color-text-muted); font-size: var(--av5-font-note); line-height: var(--av5-line-note); }
.section { padding-block: 48px; }
.section-heading { margin-bottom: 32px; }
.section-heading > p:not(.eyebrow) { max-width: 44em; color: var(--av5-color-text-secondary); }
.card-grid { display: grid; gap: 16px; }
.card { min-width: 0; padding: 24px; border: 1px solid var(--av5-color-border); border-radius: var(--av5-radius-card); background: var(--website-color-surface); }
.card > :last-child { margin-bottom: 0; }
.card-subsection { margin-top: 24px; }
.card p, .card li { color: var(--av5-color-text-secondary); }
.card-label { display: block; margin-bottom: 12px; color: var(--av5-color-primary); font-size: var(--av5-font-table); line-height: var(--av5-line-table); }
.section-white { background: var(--website-color-surface); border-block: 1px solid var(--av5-color-border); }
.split { display: grid; gap: 32px; }
.checklist { margin-bottom: 0; }
.notice { padding: 20px 24px; border-left: 3px solid var(--av5-color-primary); border-radius: var(--av5-radius-control); background: var(--website-color-primary-soft); }
.notice > :last-child { margin-bottom: 0; }
.faq { border-top: 1px solid var(--av5-color-border); }
.faq details { border-bottom: 1px solid var(--av5-color-border); }
.faq summary { padding: 22px 4px; cursor: pointer; font-weight: 600; }
.faq details p { max-width: 62em; padding-inline: 4px; color: var(--av5-color-text-secondary); }
.next-step { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 28px; }
.next-step p { margin: 0; }
.next-step .actions { margin: 0; }
.site-footer { padding-block: 28px; border-top: 1px solid var(--av5-color-border); background: var(--website-color-surface); }
.footer-top, .footer-meta { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 12px 24px; }
.footer-top { margin-bottom: 24px; }
.footer-top p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px 20px; }
.footer-meta, .footer-meta a { color: var(--av5-color-text-muted); font-size: var(--av5-font-note); line-height: var(--av5-line-note); }
.footer-meta p { margin: 0; }

/* 首页专用展示层级：不覆盖工作台或入门/说明页的字阶。 */
.home-page {
  /* 仅首页统一深蓝主题；共享基础组件在本页继承浅色文字和深色边框。 */
  --av5-color-text: var(--website-color-on-night);
  --av5-color-text-secondary: var(--website-color-on-night-secondary);
  --av5-color-text-muted: var(--website-color-on-night-muted);
  --av5-color-primary: var(--website-color-link);
  --av5-color-border: var(--website-color-night-line);
  --website-color-primary-soft: var(--website-color-night-end);
  background: var(--website-color-night);
  color: var(--website-color-on-night);
  font-size: var(--website-font-copy);
  line-height: var(--website-line-copy);
}
.home-page a:focus-visible, .home-page summary:focus-visible { outline-color: var(--website-color-on-night); }
.home-page .skip-link { background: var(--website-color-night-end); color: var(--website-color-on-night); }
.home-page .site-header { background: var(--website-color-night); border-bottom-color: var(--website-color-night-line); }
.home-page .header-inner { padding-block: 16px; }
.home-page .brand { color: var(--website-color-on-night); }
.home-page .brand-mark { color: var(--website-color-on-night); background: transparent; border: 1px solid var(--website-color-night-line); }
.home-page .site-nav > a:not(.button) { color: var(--website-color-on-night-secondary); font-size: var(--av5-font-body); }
.home-page .site-nav > a:not(.button):hover { color: var(--website-color-on-night); }
.home-page .site-header a:focus-visible, .hero a:focus-visible,
.start-section a:focus-visible, .home-page .site-footer a:focus-visible { outline-color: var(--website-color-on-night); }
.home-page .section-heading h2, .home-page .next-step h2 { font-size: var(--website-font-section); line-height: var(--website-line-section); letter-spacing: -.02em; }
.home-page .card h3 { font-size: var(--av5-font-title); line-height: var(--av5-line-title); }
.hero { padding-block: 56px; color: var(--website-color-on-night); background-color: var(--website-color-night); background-image: radial-gradient(ellipse at 88% 24%, var(--website-color-halo), transparent 65%), linear-gradient(135deg, var(--website-color-night), var(--website-color-night-end)); }
.hero-copy { max-width: 800px; text-align: center; }
.hero .eyebrow { margin-bottom: 24px; color: var(--website-color-on-night-secondary); }
.hero h1 { margin-bottom: 24px; font-size: var(--website-font-display); line-height: var(--website-line-display); font-weight: 650; letter-spacing: -.025em; }
.hero-description { max-width: 640px; margin-inline: auto; color: var(--website-color-on-night-secondary); }
.hero .actions { justify-content: center; margin-block: 32px 20px; }
.hero .note { color: var(--website-color-on-night-muted); }
.hero .button, .start-section .button { border-color: var(--website-color-night-line); color: var(--website-color-on-night); }
.home-page .site-header .button-primary, .hero .button-primary,
.start-section .button-primary { border-color: var(--website-color-on-night); background: var(--website-color-on-night); color: var(--website-color-night); }
.workflow-section { background: var(--website-color-night-panel); }
.flow-figure { margin: 0 0 40px; padding: 24px; border: 1px solid var(--av5-color-border); border-radius: var(--av5-radius-card); background: var(--website-color-night-end); }
.figure-heading { display: flex; justify-content: space-between; flex-wrap: wrap; align-items: baseline; gap: 8px; margin-bottom: 24px; }
.figure-heading h3 { margin: 0; }
.flow-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 24px; }
.flow-list li { display: flex; align-items: flex-start; gap: 16px; margin: 0; min-width: 0; }
.step-number { flex: none; display: grid; place-items: center; width: 30px; height: 30px; background: var(--website-color-primary-soft); border: 1px solid var(--av5-color-border); border-radius: var(--av5-radius-control); color: var(--av5-color-primary); font-size: var(--av5-font-table); line-height: var(--av5-line-table); font-weight: 600; }
.flow-list strong { display: block; margin-bottom: 4px; font-size: var(--av5-font-body); line-height: var(--av5-line-body); font-weight: 600; }
.flow-list p { margin: 0; color: var(--av5-color-text-secondary); font-size: var(--av5-font-table); line-height: var(--av5-line-table); }
.flow-figure figcaption { margin-top: 24px; }
.capability-grid { gap: 0; }
.capability-grid .card { padding: 24px 0; border: 0; border-top: 1px solid var(--av5-color-border); border-radius: 0; background: transparent; }
.collaboration-section { background: var(--website-color-night); }
.collaboration-section .section-heading { margin: 0; }
.collaboration-section .section-heading a { display: inline-block; margin-top: 12px; font-size: var(--av5-font-body); }
.responsibility-grid { display: grid; gap: 16px; }
.responsibility-grid .card { background: var(--website-color-night-panel); }
.responsibility-grid .card + .card { background: var(--website-color-night-end); }
.faq-section { background: var(--website-color-night-panel); }
.faq-container { max-width: 880px; }
.faq-section .faq { font-size: var(--av5-font-subtitle); line-height: var(--av5-line-subtitle); }
.faq-section details p { padding-bottom: 12px; font-size: var(--av5-font-body); line-height: var(--website-line-copy); }
.start-section { background: var(--website-color-night-end); color: var(--website-color-on-night); }
.start-section .eyebrow { margin-bottom: 16px; color: var(--website-color-on-night-secondary); }
.start-section .next-step > div > p:last-child { color: var(--website-color-on-night-secondary); }
.start-section .next-step h2 { margin-bottom: 20px; }
.home-page .site-footer { background: var(--website-color-night); border-top-color: var(--website-color-night-line); color: var(--website-color-on-night-secondary); }
.home-page .footer-links a { color: var(--website-color-on-night-secondary); font-size: var(--av5-font-table); }
.home-page .footer-meta, .home-page .footer-meta a { color: var(--website-color-on-night-muted); }

.page-intro { padding-block: 32px; background: var(--website-color-surface); border-bottom: 1px solid var(--av5-color-border); }
.breadcrumb { margin-bottom: 20px; color: var(--av5-color-text-muted); font-size: var(--av5-font-note); line-height: var(--av5-line-note); }
.page-intro p:last-child { margin-bottom: 0; max-width: 58em; color: var(--av5-color-text-secondary); }
.guide-layout { display: grid; gap: 24px; align-items: start; }
.guide-toc { padding: 20px; border: 1px solid var(--av5-color-border); border-radius: var(--av5-radius-card); background: var(--website-color-surface); }
.guide-toc h2 { font-size: var(--av5-font-subtitle); line-height: var(--av5-line-subtitle); }
.guide-toc ol { margin-bottom: 0; }
.guide-toc a { display: inline-block; padding-block: 5px; }
.guide-content { display: grid; gap: 20px; min-width: 0; }
.guide-content section { scroll-margin-top: 24px; }
.guide-content .card h2 { display: flex; gap: 12px; align-items: center; }
.guide-content .card h3 { margin-top: 24px; }
.article-width { max-width: 880px; }
.article-body { display: grid; gap: 20px; }
.article-body section { padding: 24px; background: var(--website-color-surface); border: 1px solid var(--av5-color-border); border-radius: var(--av5-radius-card); }
.article-body section > :last-child { margin-bottom: 0; }
.article-body li, .article-body section p { color: var(--av5-color-text-secondary); }

@media (min-width: 768px) {
  :root {
    --av5-line-subtitle: 24px;
    --av5-line-body: 22px;
    --av5-line-table: 20px;
    --av5-line-note: 18px;
    --av5-radius-control: 8px;
    --av5-radius-card: 12px;
    --website-font-display: 48px;
    --website-line-display: 60px;
    --website-font-section: 32px;
    --website-line-section: 44px;
  }
  .container { width: min(calc(100% - 48px), var(--av5-content-max)); }
  .hero { padding-block: 88px; }
  .section { padding-block: 80px; }
  .card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .capability-grid .card { padding: 0 28px; border-top: 0; border-left: 1px solid var(--av5-color-border); }
  .capability-grid .card:first-child { padding-left: 0; border-left: 0; }
  .capability-grid .card:last-child { padding-right: 0; }
  .split { grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 64px; align-items: center; }
  .flow-figure { padding: 32px; }
  .flow-list { grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 20px; }
  .flow-list li { flex-direction: column; gap: 14px; }
  .guide-layout { grid-template-columns: 230px minmax(0, 1fr); }
  .page-intro { padding-block: 40px; }
  .home-page .site-footer { padding-block: 36px; }
}
@media (min-width: 1100px) {
  .responsibility-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 479px) {
  .header-inner { align-items: flex-start; }
  .site-nav { width: 100%; justify-content: space-between; gap: 8px; }
  .site-nav .button { padding-inline: 12px; }
  .home-page .header-inner { align-items: center; flex-wrap: nowrap; gap: 12px; padding-block: 12px; }
  .home-page .site-nav { width: auto; }
  .home-page .site-nav > a.nav-workflow, .home-page .site-nav > a.nav-guide { display: none; }
  .actions > .button { flex: 1 1 auto; }
  .card, .flow-figure, .article-body section { padding: 20px; }
  .capability-grid .card { padding: 24px 0; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print {
  .home-page {
    --av5-color-text: #1f2329;
    --av5-color-text-secondary: #646a73;
    --av5-color-text-muted: #6a7078;
    --av5-color-primary: #245bdb;
    --av5-color-border: #e5e6eb;
    --website-color-primary-soft: #eef3ff;
  }
  .home-page, .home-page .responsibility-grid .card,
  .home-page .responsibility-grid .card + .card { background: var(--website-color-surface); color: var(--av5-color-text); }
  .site-nav, .skip-link, .actions, .guide-toc { display: none; }
  body, .hero, .section, .page-intro, .site-footer,
  .home-page .site-header, .home-page .site-footer, .flow-figure { background: var(--website-color-surface); }
  .hero, .hero .eyebrow, .hero .note, .hero-description,
  .home-page .brand, .home-page .brand-mark,
  .start-section, .start-section .eyebrow, .start-section .next-step > div > p:last-child,
  .home-page .site-footer, .home-page .footer-links a, .home-page .footer-meta, .home-page .footer-meta a { color: var(--av5-color-text); }
  .container { width: 100%; }
  .guide-layout, .split, .card-grid, .flow-list, .responsibility-grid { display: block; }
  .card, .notice, .flow-figure, .article-body section { break-inside: avoid; margin-bottom: 16px; }
}