:root {
  color-scheme: light;
  --page: #f2f5f5;
  --surface: #fff;
  --ink: #172326;
  --muted: #5e6d70;
  --line: #d4dddd;
  --green: #147d64;
  --green-dark: #0e5e4b;
  --blue: #245bb8;
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
}

* { box-sizing: border-box; letter-spacing: 0; }
body { margin: 0; min-width: 320px; color: var(--ink); background: var(--page); }
a { color: var(--blue); }
.site-header { border-bottom: 1px solid var(--line); background: var(--surface); }
.site-header > div, main, .site-footer > div { width: min(920px, calc(100% - 32px)); margin: 0 auto; }
.site-header > div { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-size: 14px; font-weight: 750; }
.brand img { width: 34px; height: 34px; border-radius: 7px; }
nav { display: flex; align-items: center; gap: 18px; }
nav a { color: var(--muted); text-decoration: none; font-size: 12px; font-weight: 650; }
nav a:hover { color: var(--ink); }
main { padding: 56px 0 72px; }
.eyebrow { margin: 0 0 8px; color: var(--green); font-size: 11px; font-weight: 800; }
h1 { margin: 0; max-width: 760px; font-size: 36px; line-height: 1.2; }
.lede { max-width: 720px; margin: 16px 0 36px; color: var(--muted); font-size: 15px; line-height: 1.75; }
.document { border-top: 1px solid var(--line); }
.document section { padding: 28px 0; border-bottom: 1px solid var(--line); }
h2 { margin: 0 0 12px; font-size: 18px; }
h3 { margin: 20px 0 8px; font-size: 14px; }
p, li { color: #435255; font-size: 13px; line-height: 1.8; }
ul, ol { margin: 10px 0 0; padding-left: 22px; }
.meta { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 8px 16px; padding: 20px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 13px; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; min-width: 0; overflow-wrap: anywhere; font-family: Consolas, monospace; }
.download-actions { margin: 28px 0; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.primary-button { min-height: 42px; padding: 0 18px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--green-dark); border-radius: 5px; color: #fff; background: var(--green); text-decoration: none; font-size: 13px; font-weight: 750; }
.primary-button:hover { background: var(--green-dark); }
.download-actions span { color: var(--muted); font-size: 12px; }
.callout { padding: 16px 18px; border-left: 3px solid var(--green); background: var(--surface); }
.callout p { margin: 0; }
.site-footer { border-top: 1px solid var(--line); background: var(--surface); }
.site-footer > div { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 16px; color: var(--muted); font-size: 11px; }
.footer-links { display: flex; gap: 14px; }
.footer-links a { color: var(--muted); }

@media (max-width: 620px) {
  .site-header > div { align-items: flex-start; padding: 14px 0; flex-direction: column; }
  nav { width: 100%; overflow-x: auto; padding-bottom: 2px; }
  main { padding-top: 42px; }
  h1 { font-size: 30px; }
  .meta { grid-template-columns: 1fr; gap: 3px; }
  .meta dd { margin-bottom: 8px; }
  .site-footer > div { padding: 16px 0; align-items: flex-start; flex-direction: column; }
}