:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #252525;
  background: #fff;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --muted: #666;
  --line: #dedede;
  --link: #245b40;
}
* { box-sizing: border-box; }
body { margin: 0; }
main { max-width: 800px; margin: auto; padding: 32px 24px 48px; }
a { color: var(--link); text-underline-offset: 3px; overflow-wrap: anywhere; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--link); outline-offset: 4px; }
.topline { display: flex; align-items: center; justify-content: space-between; gap: 24px; font-size: 14px; }
.topline a { padding: 12px 0; }
.brand { color: inherit; font-weight: 650; text-decoration: none; letter-spacing: .04em; }
h1 { font-size: 28px; line-height: 1.4; margin: 24px 0; font-weight: 650; }
.site-nav { display: flex; flex-wrap: wrap; gap: 0 24px; padding: 8px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 14px; }
.site-nav a { display: inline-block; padding: 12px 0; }
.site-nav [aria-current] { color: inherit; font-weight: 650; text-decoration: none; }
.contents { margin: 24px 0; font-size: 14px; }
summary { width: fit-content; cursor: pointer; padding: 10px 0; color: var(--muted); }
.contents ol { padding-left: 24px; }
.contents a { display: inline-block; padding: 8px 0; }
article { margin-top: 28px; overflow-wrap: anywhere; }
section { margin: 32px 0; scroll-margin-top: 24px; }
h2 { font-size: 19px; line-height: 1.55; margin: 0 0 12px; font-weight: 650; }
p { font-size: 16px; line-height: 1.9; margin: 12px 0; }
footer { border-top: 1px solid var(--line); margin-top: 40px; padding-top: 20px; color: var(--muted); font-size: 13px; }
footer p { font-size: inherit; margin: 0 0 8px; }
.skip-link { position: absolute; top: -100px; left: 16px; padding: 12px; background: Canvas; }
.skip-link:focus { top: 8px; }
@media (max-width: 480px) {
  main { padding: 20px 20px 36px; }
  h1 { font-size: 25px; }
  .site-nav { column-gap: 20px; }
}
@media (prefers-color-scheme: dark) {
  :root { color: #e5e5e5; background: #171717; --muted: #ababab; --line: #393939; --link: #9dceb0; }
}
@media print {
  :root { color-scheme: light; color: #000; background: #fff; --muted: #444; --line: #ccc; --link: #000; }
  main { max-width: none; padding: 0; }
  .site-nav, .contents, .topline, .skip-link { display: none; }
  h2 { break-after: avoid; }
  p { orphans: 3; widows: 3; }
}