/* 多页官网：沿用首页纸色、宋体、蓝色按钮，仅扩展导航与内容页。 */
.site-nav .brand { white-space: nowrap; }
.site-nav .nav-links { gap: 24px; }
.site-nav a[aria-current="page"] { color: var(--brand); }
.site-nav a[aria-current="page"]::after { content: ""; display: block; height: 2px; border-radius: 2px; background: var(--brand); margin-top: 1px; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--brand); outline-offset: 5px; }
.skip-link { position: fixed; top: -80px; left: 16px; z-index: 100; background: var(--ivory); padding: 10px 20px; }
.skip-link:focus { top: 12px; }
.page-head { padding-top: 64px; padding-bottom: 42px; }
.eyebrow { margin: 0 0 14px; color: var(--brand); font: 12px/1.5 var(--ui); letter-spacing: .15em; text-transform: uppercase; }
.page-head h1 { font-size: 52px; line-height: 1.25; letter-spacing: .01em; }
.page-head .lede { font-size: 19px; max-width: 700px; margin-top: 18px; }
.page-meta { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 18px 0 0; color: var(--muted); font: 14px/1.6 var(--ui); }
.breadcrumbs { margin-bottom: 26px; color: var(--muted); font: 14px/1.6 var(--ui); }
.breadcrumbs span { margin: 0 10px; }
.section-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding-bottom: 18px; border-bottom: 1px solid var(--line); margin-bottom: 24px; }
.section-heading h2 { font-size: 27px; }
.section-heading p { margin: 0; font-size: 14px; color: var(--muted); }
.content-section + .content-section { margin-top: 60px; }
.guide-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.guide-card { display: flex; flex-direction: column; align-items: flex-start; padding: 30px; border: 1px solid var(--line); border-radius: 16px; background: var(--ivory); color: var(--text); transition: border-color .15s, transform .15s; }
.guide-card:hover { border-color: var(--brand); transform: translateY(-2px); }
.tag { display: inline-block; color: var(--brand); font: 12px/1.5 var(--ui); background: color-mix(in srgb, var(--brand) 7%, var(--ivory)); padding: 4px 10px; border-radius: 6px; }
.guide-card h3 { font-size: 24px; line-height: 1.45; margin: 18px 0 10px; }
.guide-card p { margin: 0 0 24px; font-size: 16px; }
.card-link { margin-top: auto; color: var(--brand); font-size: 15px; }
.video-card { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; background: var(--ivory); color: var(--text); }
.video-card img { width: 100%; height: 100%; object-fit: cover; }
.video-card .video-copy { padding: 30px; }
.video-card + .video-card { margin-top: 20px; }
.video-copy h3 { font-size: 25px; line-height: 1.45; margin: 14px 0 10px; }
.video-copy p { font-size: 16px; margin-bottom: 22px; }
.help-strip { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin-top: 60px; border-top: 1px solid var(--line); padding-top: 24px; }
.help-strip p { margin: 0; font-size: 16px; }
.help-strip a { white-space: nowrap; }
.site-footer-links { display: flex; flex-wrap: wrap; gap: 10px 26px; margin-bottom: 22px; font-size: 15px; }
.doc-layout { display: grid; grid-template-columns: 200px minmax(0,1fr); gap: 56px; align-items: start; }
.doc-toc { position: sticky; top: 112px; font: 14px/1.7 var(--ui); border-left: 1px solid var(--line); padding-left: 20px; }
.doc-toc p { margin: 0 0 12px; color: var(--ink); font-weight: 600; }
.doc-toc a { display: block; color: var(--muted); padding: 6px 0; }
.doc-toc a:hover { color: var(--brand); }
.doc-body { min-width: 0; max-width: 800px; }
.doc-body > :first-child { margin-top: 0; }
.doc-body h2 { margin: 52px 0 18px; font-size: 28px; line-height: 1.4; scroll-margin-top: 110px; }
.doc-body h3 { margin: 30px 0 12px; font-size: 22px; }
.doc-body p { margin: 18px 0; }
.doc-body ul, .doc-body ol { padding-left: 24px; }
.doc-body li { margin: 10px 0; }
.doc-body p a, .doc-body li a, .text-link { text-decoration: underline; text-underline-offset: 4px; }
.guide-image { margin: 28px 0 40px; }
.guide-image a { display: block; width: fit-content; max-width: 100%; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--ivory); cursor: zoom-in; box-shadow: 0 8px 24px rgba(47,45,42,.06); transition: border-color .15s, box-shadow .15s, transform .15s; }
.guide-image a:hover { border-color: var(--brand); box-shadow: 0 10px 28px rgba(31,79,143,.12); transform: translateY(-1px); }
.guide-image img { max-height: 700px; width: auto; object-fit: contain; }
.guide-image figcaption { margin-top: 10px; color: var(--muted); font: 13px/1.6 var(--ui); }
.note { padding: 18px 22px; margin: 26px 0; border-left: 3px solid var(--brand); background: var(--ivory); font-size: 15px; }
.note p { margin: 0; }
.note p + p { margin-top: 8px; }
.article-next { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 20px; font-size: 15px; }
.image-viewer { position: relative; border: 1px solid var(--line); background: var(--ivory); color: var(--text); padding: 24px 24px 18px; border-radius: 16px; max-width: 96vw; max-height: 94vh; box-shadow: 0 24px 80px rgba(25,35,50,.28); }
.image-viewer::backdrop { background: rgba(25,35,50,.78); backdrop-filter: blur(3px); }
.image-viewer-close { position: absolute; z-index: 1; top: 12px; right: 12px; display: grid; place-items: center; width: 38px; height: 38px; margin: 0; padding: 0; cursor: pointer; font: 28px/1 var(--ui); font-weight: 300; background: var(--ivory); color: var(--brand); border: 1px solid var(--line); border-radius: 50%; box-shadow: 0 3px 12px rgba(25,35,50,.12); }
.image-viewer-close:hover { background: var(--brand); color: var(--ivory); border-color: var(--brand); }
.image-viewer figure { margin: 28px 0 0; }
.image-viewer img { max-height: 76vh; max-width: 90vw; width: auto; margin: auto; border-radius: 8px; }
.image-viewer figcaption { margin-top: 12px; text-align: center; color: var(--muted); font: 13px/1.6 var(--ui); }
.release-layout { display: grid; grid-template-columns: 200px minmax(0,1fr); gap: 56px; }
.release { padding: 0 0 46px; margin-bottom: 42px; border-bottom: 1px solid var(--line); scroll-margin-top: 110px; }
.release:last-child { margin-bottom: 0; }
.release-top { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; }
.release-top h2 { font-size: 32px; }
.release time { color: var(--muted); font: 14px var(--ui); }
.release h3 { font-size: 24px; margin: 18px 0 12px; }
.release p { margin: 12px 0; }
.release-group { display: grid; grid-template-columns: 48px 1fr; gap: 18px; margin-top: 24px; }
.release-group b { color: var(--brand); font: 13px/1.7 var(--ui); padding-top: 2px; }
.release-group ul { padding-left: 18px; margin: 0; font-size: 16px; }
.release-group li + li { margin-top: 10px; }
.download-platforms { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.platform { display: flex; flex-direction: column; padding: 32px; border: 1px solid var(--line); border-radius: 16px; background: var(--ivory); }
.platform-icon { width: 42px; height: 42px; fill: none; stroke: var(--brand); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; margin-bottom: 20px; }
.platform h2 { font-size: 29px; }
.platform > p { font-size: 16px; margin: 10px 0 24px; }
.platform .btn { align-self: flex-start; margin-top: auto; }
.platform .platform-links { font-size: 14px; margin: 20px 0 0; display: flex; flex-wrap: wrap; gap: 8px 20px; }
.download-info { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-top: 52px; }
.download-info h2 { font-size: 25px; }
.download-info p, .download-info li { font-size: 16px; }
.download-info ol { padding-left: 22px; }
.download-info li { margin: 12px 0; }
.chapter-list { list-style: none; padding: 0 !important; border-top: 1px solid var(--line); }
.chapter-list li { margin: 0; border-bottom: 1px solid var(--line-faint); }
.chapter-list a { display: flex; gap: 24px; padding: 14px 0; text-decoration: none !important; }
.chapter-list span { color: var(--muted); font: 14px/1.9 var(--ui); }
@media (max-width: 900px) {
  .site-nav .nav-in { gap: 18px; }
  .site-nav .nav-links { gap: 16px; }
  .doc-layout, .release-layout { grid-template-columns: 160px minmax(0,1fr); gap: 32px; }
}
@media (max-width: 720px) {
  .site-nav .nav-in { flex-wrap: wrap; border-radius: 20px; padding: 10px 14px; gap: 8px 14px; }
  .site-nav .brand { margin-right: auto; }
  .site-nav .nav-links { display: flex; order: 3; width: 100%; justify-content: space-between; gap: 10px; padding-top: 7px; border-top: 1px solid var(--line-faint); font-size: 14px; }
  .site-nav .btn { margin-left: auto; }
  html { scroll-padding-top: 130px; }
  .page-head { padding-top: 40px; padding-bottom: 30px; }
  .page-head h1 { font-size: 36px; }
  .page-head .lede { font-size: 17px; }
  .guide-grid, .video-card, .download-platforms, .download-info { grid-template-columns: 1fr; }
  .guide-card, .video-card .video-copy, .platform { padding: 24px; }
  .video-card img { height: auto; }
  .doc-layout, .release-layout { grid-template-columns: 1fr; gap: 28px; }
  .doc-toc { position: static; padding: 16px 20px; background: var(--ivory); border: 1px solid var(--line); border-radius: 10px; }
  .doc-toc a { padding: 5px 0; }
  .doc-body h2, .release { scroll-margin-top: 140px; }
  .doc-body h2 { font-size: 25px; }
  .help-strip { align-items: flex-start; flex-direction: column; gap: 12px; }
  .section-heading { align-items: flex-start; flex-direction: column; gap: 6px; }
  .download-info { gap: 30px; margin-top: 36px; }
  .release-group { grid-template-columns: 36px 1fr; gap: 12px; }
  .article-next { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}
/* 价格页：两张版本卡 + 对比表 */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 64px; }
.plan { display: flex; flex-direction: column; padding: 32px; border: 1px solid var(--line); border-radius: 16px; background: var(--ivory); }
.plan-featured { border-color: var(--brand); box-shadow: 0 0 0 1px var(--brand) inset; }
.plan-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.plan h2 { font-size: 29px; }
.plan-fit { margin: 6px 0 0; color: var(--muted); font-size: 15px; }
.plan-price { margin: 22px 0 20px; color: var(--muted); font: 15px/1.2 var(--ui); }
.plan-price b { color: var(--ink); font: 600 46px/1 var(--serif); margin-right: 4px; }
.plan ul { list-style: none; margin: 0 0 28px; padding: 20px 0 0; border-top: 1px solid var(--line-faint); }
.plan li { position: relative; padding-left: 26px; margin: 10px 0; font-size: 16px; }
.plan li::before { content: ""; position: absolute; left: 2px; top: .55em; width: 12px; height: 6px; border-left: 1.8px solid var(--brand); border-bottom: 1.8px solid var(--brand); transform: rotate(-45deg); }
.plan .btn { align-self: flex-start; margin-top: auto; }
.compare-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--ivory); }
.compare { width: 100%; border-collapse: collapse; font-size: 16px; }
.compare th, .compare td { padding: 15px 20px; text-align: left; border-bottom: 1px solid var(--line-faint); vertical-align: top; }
.compare tbody tr:last-child th, .compare tbody tr:last-child td { border-bottom: 0; }
.compare thead th { color: var(--ink); font: 600 15px/1.5 var(--ui); background: var(--sand); border-bottom: 1px solid var(--line); }
.compare thead th + th, .compare td { width: 30%; }
.compare tbody th { color: var(--text); font-weight: 400; }
.compare td b { color: var(--brand); font-weight: 600; }
.compare .yes { color: var(--brand); font: 600 17px/1 var(--ui); }
@media (max-width: 720px) {
  .plans { grid-template-columns: 1fr; gap: 18px; margin-bottom: 48px; }
  .plan { padding: 24px; }
  .plan-price b { font-size: 40px; }
  .compare { font-size: 15px; }
  .compare th, .compare td { padding: 12px 12px; }
  .compare thead th + th, .compare td { width: 27%; }
}
.buy li b { color: var(--ink); font-weight: 600; }
.buy-more { margin: 18px 0 0; font-size: 15px; }
.buy-more a { text-decoration: underline; text-underline-offset: 4px; }
.section-heading + .faq { margin-top: 0; border-top: 0; }