:root {
  color-scheme: light;
  --paper: #fff;
  --ink: #111;
  --muted: #626262;
  --rule: #dedede;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 2rem; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.8; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-underline-offset: .3em; }
a:hover { text-decoration: underline; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--ink); outline-offset: 5px; }
::selection { color: #fff; background: #222; }
.sheet { width: min(1120px, calc(100% - 96px)); margin: 0 auto; }
.skip { position: absolute; top: -100px; left: 16px; padding: 12px 20px; background: #111; color: #fff; z-index: 2; }
.skip:focus { top: 12px; }
.brand { display: flex; justify-content: space-between; align-items: center; gap: 32px; padding: 30px 0; border-bottom: 1px solid var(--rule); }
.wordmark { text-decoration: none; flex-shrink: 0; }
.wordmark strong { display: flex; align-items: center; gap: 9px; font-size: 18px; letter-spacing: .15em; font-weight: 700; line-height: 1.5; }
.wordmark > span { display: block; font-size: 10px; letter-spacing: .3em; margin-top: 3px; }
.brand-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--ink); }
.langs { display: flex; flex-wrap: wrap; gap: 8px 22px; list-style: none; padding: 0; margin: 0; font-size: 12px; }
.langs a { display: inline-block; padding: 7px 0; text-decoration: none; color: var(--muted); }
.langs a[aria-current="true"] { color: var(--ink); box-shadow: 0 1px var(--ink); }
.langs a:hover { color: var(--ink); text-decoration: underline; }
.document-nav { border-bottom: 1px solid var(--rule); }
.document-nav ul { display: flex; flex-wrap: wrap; gap: 6px 28px; list-style: none; padding: 0; margin: 0; }
.document-nav a { display: inline-block; padding: 14px 0; color: var(--muted); text-decoration: none; font-size: 12px; line-height: 1.5; }
.document-nav a:hover, .document-nav a[aria-current="page"] { color: var(--ink); }
.document-nav a[aria-current="page"] { box-shadow: inset 0 -2px var(--ink); font-weight: 600; }
.hero { padding: 68px 0 48px; max-width: 850px; }
.eyebrow { margin: 0 0 24px; font-size: 11px; font-weight: 600; letter-spacing: .14em; }
.eyebrow span { margin: 0 12px; color: var(--muted); }
h1 { margin: 0 0 24px; font-size: clamp(36px, 5vw, 62px); font-weight: 600; letter-spacing: -.035em; line-height: 1.2; overflow-wrap: anywhere; }
.summary { max-width: 680px; margin: 0; font-size: 17px; color: #444; line-height: 1.85; }
.updated { margin: 26px 0 0; font-size: 11px; color: var(--muted); }
.updated time { margin-left: 12px; font-variant-numeric: tabular-nums; }
.document-layout { border-top: 1px solid var(--ink); display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 64px; padding-top: 38px; }
.toc-desktop { position: sticky; top: 32px; padding-bottom: 24px; }
.toc-label { margin: 0 0 20px; font-size: 12px; font-weight: 600; }
.toc ol { margin: 0; padding: 0; list-style: none; }
.toc a { display: flex; gap: 16px; padding: 9px 0; font-size: 13px; line-height: 1.65; text-decoration: none; color: #4c4c4c; }
.toc a span { font-size: 10px; padding-top: 2px; color: var(--muted); font-variant-numeric: tabular-nums; }
.toc a:hover { color: var(--ink); text-decoration: underline; }
.toc-mobile { display: none; }
.document { min-width: 0; }
.policy-section { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 16px; padding: 0 0 36px; margin: 0 0 36px; border-bottom: 1px solid var(--rule); }
.section-number { padding-top: 6px; font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; }
h2 { margin: 0 0 18px; font-size: 22px; font-weight: 600; line-height: 1.5; letter-spacing: -.015em; }
.policy-section p { margin: 0 0 14px; font-size: 15px; line-height: 1.95; overflow-wrap: anywhere; color: #333; }
.policy-section p:last-child { margin-bottom: 0; }
.contact { border-left: 2px solid #111; padding: 0 0 0 24px; margin: 44px 0; }
.contact h2 { font-size: 18px; margin-bottom: 10px; }
.contact p { font-size: 14px; color: var(--muted); margin: 0 0 16px; }
.contact a, .back { font-size: 13px; }
.back { display: inline-block; margin-bottom: 12px; text-decoration: none; }
.index { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--ink); }
.index a { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 28px 0; border-bottom: 1px solid var(--rule); text-decoration: none; }
.index a:hover strong { text-decoration: underline; text-underline-offset: .3em; }
.index strong { display: block; font-size: 21px; font-weight: 600; }
.index small { display: block; font-size: 14px; color: var(--muted); margin-top: 6px; }
.footer { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 80px; padding: 28px 0 36px; border-top: 1px solid var(--rule); font-size: 11px; color: var(--muted); }
.footer a { text-decoration: none; }
@media (max-width: 800px) {
  .sheet { width: calc(100% - 48px); }
  .brand { align-items: flex-start; flex-direction: column; gap: 20px; padding: 24px 0; }
  .langs { gap: 6px 20px; }
  .document-nav { overflow-x: auto; scrollbar-width: thin; }
  .document-nav ul { width: max-content; flex-wrap: nowrap; gap: 24px; }
  .document-nav a { white-space: nowrap; }
  .hero { padding: 44px 0 32px; }
  .eyebrow { margin-bottom: 20px; }
  .summary { font-size: 15px; }
  .document-layout { display: block; padding-top: 0; }
  .toc-desktop { display: none; }
  .toc-mobile { display: block; border-bottom: 1px solid var(--rule); margin-bottom: 32px; }
  .toc-mobile summary { padding: 18px 0; font-size: 13px; font-weight: 600; cursor: pointer; }
  .toc-mobile nav { padding: 0 0 18px; }
  .toc a { padding: 12px 0; }
  .policy-section { grid-template-columns: 22px minmax(0, 1fr); gap: 10px; margin-bottom: 28px; padding-bottom: 28px; }
  h2 { font-size: 20px; margin-bottom: 14px; }
  .policy-section p { font-size: 15px; }
  .footer { margin-top: 52px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print {
  .sheet { width: 100%; }
  .brand { padding: 0 0 16px; }
  .langs, .document-nav, .toc, .back, .skip, .footer a { display: none; }
  .hero { padding: 24px 0; }
  h1 { font-size: 32px; }
  .document-layout { display: block; }
  .policy-section { break-inside: avoid; }
  .footer { margin-top: 24px; }
}