:root { color-scheme: light; font-family: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif; color: #202520; background: #f5f6f4; }
* { box-sizing: border-box; }
body { margin: 0; font-size: 17px; line-height: 1.95; }
a { color: #22523e; text-underline-offset: .2em; overflow-wrap: anywhere; }
a:hover { color: #143628; }
a:focus-visible, summary:focus-visible { outline: 3px solid #467dba; outline-offset: 5px; border-radius: 2px; }
.skip { position: absolute; top: -100px; left: 20px; padding: 8px 12px; background: white; z-index: 2; }
.skip:focus { top: 10px; }
.shell { max-width: 940px; margin: 0 auto; background: #fff; min-height: 100vh; padding: 24px 64px 48px; }
.brand { padding: 0 0 20px; margin-bottom: 30px; border-bottom: 1px solid #dce2dc; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; }
.brand a { color: #202520; font-weight: 600; text-decoration: none; }
.brand span { font-size: 14px; color: #4d594e; }
h1 { font-size: 32px; line-height: 1.45; margin: 0 0 22px; color: #111; letter-spacing: .01em; }
h2 { font-size: 23px; line-height: 1.6; margin: 44px 0 18px; color: #111; scroll-margin-top: 24px; }
h3 { font-size: 18px; line-height: 1.7; margin: 26px 0 10px; color: #111; }
p { margin: 0 0 17px; overflow-wrap: anywhere; }
strong { font-weight: 650; }
.meta { color: #4d594e; font-size: 15px; margin-bottom: 26px; }
.meta p { margin: 0 0 3px; }
.toc { margin: 26px 0 30px; padding: 14px 0; border-top: 1px solid #dce2dc; border-bottom: 1px solid #dce2dc; }
.toc summary { cursor: pointer; font-weight: 600; }
.toc ol { padding-left: 24px; margin: 10px 0 0; }
.toc li { padding: 2px 0; }
.toc a { text-decoration: none; }
footer { border-top: 1px solid #dce2dc; margin-top: 44px; padding-top: 22px; color: #4d594e; font-size: 14px; }
footer p { margin-bottom: 7px; }
.draft { color: #695129; font-size: 14px; margin: 0 0 24px; }
@media (max-width: 640px) {
  body { font-size: 16px; line-height: 1.9; background: #fff; }
  .shell { padding: 20px 22px 34px; }
  .brand { margin-bottom: 25px; padding-bottom: 16px; }
  h1 { font-size: 27px; line-height: 1.45; }
  h2 { font-size: 21px; margin-top: 36px; }
  h3 { font-size: 18px; }
  .meta { font-size: 14px; }
}
@media print {
  :root, body { background: #fff; color: #000; }
  body { font-size: 11pt; line-height: 1.65; }
  .shell { max-width: none; padding: 0; }
  .brand, .toc, .skip, footer .top { display: none; }
  h1 { font-size: 22pt; }
  h2 { font-size: 15pt; margin-top: 22pt; break-after: avoid; }
  h3 { font-size: 12pt; break-after: avoid; }
  p { orphans: 3; widows: 3; }
  a { color: #000; }
}