:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #1f1f1f;
  background: #fff;
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0;
  -webkit-text-size-adjust: 100%;
}

* { box-sizing: border-box; }
body { margin: 0; }
a { color: #0b57d0; text-underline-offset: 4px; overflow-wrap: anywhere; }
a:focus-visible { outline: 2px solid #0b57d0; outline-offset: 4px; }
.shell { width: min(100% - 40px, 760px); margin-inline: auto; }
.site-header { border-bottom: 1px solid #e3e3e3; }
.brand { display: inline-flex; align-items: center; gap: 10px; min-height: 72px; color: #1f1f1f; text-decoration: none; font-weight: 600; }
.brand img { width: 36px; height: 36px; border-radius: 8px; }
main { padding-block: 32px 48px; overflow-wrap: anywhere; }
h1 { margin: 0 0 8px; font-size: 28px; line-height: 1.4; font-weight: 650; }
h2 { margin: 36px 0 12px; font-size: 20px; line-height: 1.55; font-weight: 650; }
h3 { margin: 22px 0 6px; font-size: 17px; line-height: 1.6; }
p { margin: 12px 0; }
ul, ol { padding-inline-start: 24px; margin-block: 12px; }
li + li { margin-top: 8px; }
strong { font-weight: 650; }
section { scroll-margin-top: 20px; }
.meta { color: #444746; font-size: 14px; margin: 0 0 20px; }
.toc { border-block: 1px solid #e3e3e3; padding-block: 16px; margin-block: 24px; }
.toc ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px 24px; margin: 0; }
.toc li + li { margin: 0; }
.toc a { display: inline-block; padding-block: 7px; }
.facts { margin: 24px 0; }
.facts div { display: grid; grid-template-columns: 100px minmax(0, 1fr); gap: 16px; padding-block: 14px; border-bottom: 1px solid #e3e3e3; }
dt { color: #444746; }
dd { margin: 0; }
.link-list { list-style: none; padding: 0; }
.link-list li { margin: 0; border-bottom: 1px solid #e3e3e3; }
.link-list a { display: block; padding-block: 14px; }
.site-footer { border-top: 1px solid #e3e3e3; color: #444746; padding-block: 20px 32px; font-size: 14px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.site-footer nav a { display: inline-block; padding-block: 8px; }
.site-footer p { margin-block: 8px; }
.skip-link { position: absolute; top: -80px; left: 16px; background: white; padding: 8px; z-index: 1; }
.skip-link:focus { top: 8px; }
@media (max-width: 480px) {
  h1 { font-size: 26px; }
  .toc ol { grid-template-columns: minmax(0, 1fr); }
  main { padding-top: 24px; }
}
@media print {
  .site-header, .site-footer nav, .skip-link, .toc { display: none; }
  .shell { width: 100%; }
  main { padding: 0; }
  h2, h3 { break-after: avoid; }
  a { color: inherit; }
}