:root {
  color-scheme: light;
  --paper: #fbfaf7;
  --ink: #202b39;
  --muted: #4c5d70;
  --link: #204f83;
  --line: #d5dce2;
  --selection: #dce7f4;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); line-height: 1.85; }
::selection { background: var(--selection); color: var(--ink); }
a { color: var(--link); text-underline-offset: 0.22em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid var(--link); outline-offset: 5px; border-radius: 2px; }
.site-header, main, .site-footer { width: min(100% - 48px, 780px); margin-inline: auto; }
.site-header { padding-block: 28px; border-bottom: 1px solid var(--line); }
.brand { display: inline-block; color: var(--ink); font-weight: 700; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 12px; font-size: 0.94rem; }
nav [aria-current="page"] { font-weight: 700; text-decoration-thickness: 2px; }
main { padding-block: 48px 56px; }
main:focus { outline: none; }
h1, h2 { line-height: 1.3; text-wrap: balance; overflow-wrap: anywhere; }
h1 { margin: 0 0 20px; font-size: clamp(2rem, 5.2vw, 3rem); letter-spacing: -0.025em; }
h2 { margin: 0 0 14px; font-size: 1.53rem; font-weight: 650; }
p { margin: 0 0 16px; overflow-wrap: anywhere; }
p:last-child { margin-bottom: 0; }
.lead { margin-bottom: 22px; color: var(--muted); font-size: 1.23rem; line-height: 1.6; }
.meta { color: var(--muted); font-size: 0.88rem; font-variant-numeric: tabular-nums; }
section { margin-top: 40px; }
code { font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 0.88em; overflow-wrap: anywhere; }
.site-footer { padding-block: 24px 36px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.88rem; }
.site-footer p + p { margin-top: 6px; }
.skip-link { position: absolute; left: 24px; top: 10px; padding: 8px 14px; background: var(--paper); transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }

@media (max-width: 480px) {
  .site-header, main, .site-footer { width: calc(100% - 36px); }
  .site-header { padding-block: 22px; }
  main { padding-block: 36px 44px; }
  section { margin-top: 32px; }
}

@media print {
  body { background: white; }
  .skip-link, nav { display: none; }
  .site-header, main, .site-footer { width: 100%; }
  main { padding-block: 24px; }
  section { break-inside: avoid; }
}