:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #222;
  background: #fff;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}
* { box-sizing: border-box; }
body { margin: 0; background: #fff; font-size: 16px; line-height: 1.85; overflow-wrap: anywhere; }
a { color: #222; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, [tabindex]:focus-visible { outline: 2px solid #222; outline-offset: 4px; }
.skip-link { position: absolute; top: 8px; left: 16px; transform: translateY(-200%); padding: 8px 16px; background: #fff; z-index: 2; }
.skip-link:focus { transform: translateY(0); }
.site-header { max-width: 800px; margin: auto; padding: 22px 28px; display: flex; align-items: center; justify-content: space-between; gap: 16px; border-bottom: 1px solid #e5e6eb; }
.brand { display: flex; gap: 10px; align-items: center; color: #222; font-weight: 700; text-decoration: none; line-height: 1.4; }
.brand img { display: block; width: 40px; height: 40px; border-radius: 9px; flex-shrink: 0; }
.brand small { display: block; font-size: 11px; font-weight: 400; color: #222; margin-top: 3px; }
.header-link { font-size: 14px; padding: 8px 0; flex-shrink: 0; }
.document { max-width: 800px; margin: 0 auto; padding: 36px 28px 48px; }
.eyebrow { color: #222; font-size: 13px; }
h1 { font-size: clamp(25px, 4vw, 32px); line-height: 1.45; margin: 10px 0 14px; }
h2 { font-size: 21px; line-height: 1.5; margin: 0 0 14px; }
h3 { font-size: 18px; line-height: 1.6; margin: 24px 0 8px; }
h4 { font-size: 16px; margin: 20px 0 8px; }
p { margin: 12px 0; }
section { margin-top: 32px; scroll-margin-top: 20px; }
.document > section + section, .annex { border-top: 1px solid #e5e6eb; padding-top: 28px; }
.lead { color: #222; }
.version { color: #222; font-size: 13px; margin: 16px 0 22px; }
.review-note, .notice { background: #fff; border-left: 2px solid #b6bec6; padding: 12px 16px; margin: 22px 0; font-size: 14px; }
.review-note p { margin: 4px 0 0; }
.notice > p:last-child { margin-bottom: 0; }
.toc { display: flex; flex-wrap: wrap; gap: 4px 20px; padding: 14px 0; border-block: 1px solid #e5e6eb; margin: 24px 0; font-size: 14px; }
.toc a { padding: 4px 0; }
ul, ol { padding-left: 1.5em; }
li { margin: 10px 0; padding-left: 3px; }
strong { font-weight: 700; }
.table-wrap { max-width: 100%; overflow-x: auto; margin: 22px 0; border: 1px solid #e5e6eb; }
table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 660px; }
caption { text-align: left; font-weight: 700; padding: 12px 14px; }
th, td { text-align: left; vertical-align: top; border-top: 1px solid #e5e6eb; padding: 12px 14px; }
thead th, tbody th { background: #fff; }
tbody th { width: 20%; }
td { width: 40%; }
.sdk-card { border-bottom: 1px solid #e5e6eb; padding: 16px 0; }
.sdk-card > h3, .sdk-card > h4 { margin-top: 0; }
dl { margin: 0; font-size: 14px; }
dt { font-weight: 700; color: #222; margin-top: 10px; }
dd { margin: 3px 0 0; }
.card-grid { display: block; margin: 20px 0; }
.card { padding: 18px 0; border-bottom: 1px solid #e5e6eb; }
.card h2, .card h3 { font-size: 18px; margin: 0 0 6px; }
.card p { margin: 0; color: #222; }
.document-list { margin: 28px 0; border-top: 1px solid #e5e6eb; }
.document-list a { display: block; padding: 18px 0; border-bottom: 1px solid #e5e6eb; font-weight: 600; text-decoration: none; }
.document-list a:hover { text-decoration: underline; }
.document-list span { display: block; color: #222; font-weight: 400; font-size: 14px; margin-top: 4px; }
.join-line { font-size: 21px; font-weight: 700; line-height: 1.7; }
.button { display: inline-block; padding: 9px 16px; border: 1px solid #222; font-weight: 600; text-decoration: none; margin: 10px 0; }
.muted { font-size: 14px; color: #222; }
.site-footer { max-width: 800px; margin: 0 auto; padding: 20px 28px 32px; border-top: 1px solid #e5e6eb; font-size: 13px; color: #222; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 4px 20px; }
.site-footer nav a { display: inline-block; padding: 8px 0; }
.site-footer p { margin: 12px 0 4px; }
@media (max-width: 700px) {
  body { font-size: 15px; }
  .site-header { padding: 18px 20px; }
  .document { padding: 28px 20px 36px; }
  h2 { font-size: 19px; }
  h3 { font-size: 17px; }
  .site-footer { padding: 18px 20px 28px; }
  .review-note, .notice { padding: 12px; }
}
@media print {
  body { font-size: 11pt; color: #000; }
  .site-header, .site-footer, .skip-link, .toc { display: none; }
  .document { max-width: none; margin: 0; padding: 0; }
  h1 { font-size: 24pt; }
  h2, h3, h4 { break-after: avoid; }
  .table-wrap { overflow: visible; border: 0; }
  table { min-width: 0; font-size: 9pt; }
  a { color: #000; }
}