:root { color-scheme: light dark; --bg:#f6f4ec; --card:#fffef9; --ink:#304535; --muted:#647260; --accent:#42683c; --line:#dce2d4; --tint:#eaf0e2; }
* { box-sizing:border-box; }
html { scroll-padding-top:24px; }
body { margin:0; background:var(--bg); color:var(--ink); font:16px/1.9 -apple-system,BlinkMacSystemFont,"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",sans-serif; overflow-wrap:anywhere; }
a { color:var(--accent); text-underline-offset:4px; }
a:hover { text-decoration-thickness:2px; }
a:focus-visible,summary:focus-visible { outline:3px solid var(--accent); outline-offset:5px; border-radius:3px; }
.skip { position:absolute; top:-100px; left:20px; padding:10px; background:var(--card); z-index:2; }
.skip:focus { top:10px; }
.masthead,main,footer { max-width:880px; margin:0 auto; padding-left:36px; padding-right:36px; }
.masthead { display:flex; gap:20px; justify-content:space-between; align-items:center; padding-top:36px; padding-bottom:28px; }
.brand { display:flex; align-items:center; gap:12px; text-decoration:none; font-size:19px; font-weight:600; line-height:1.5; }
.brand img { object-fit:contain; }
.brand small { display:block; color:var(--muted); font-size:12px; font-weight:400; letter-spacing:.06em; margin-top:3px; }
.home { font-size:13px; white-space:nowrap; }
.heading { padding:35px 0 26px; border-top:1px solid var(--line); }
.eyebrow { color:var(--muted); font-size:12px; letter-spacing:.12em; margin:0 0 12px; }
h1 { font-size:36px; font-weight:650; line-height:1.4; letter-spacing:.02em; margin:0 0 16px; }
.summary { color:var(--muted); margin:0 0 15px; max-width:42em; }
.date,.footnote { color:var(--muted); font-size:12px; }
.date { margin-bottom:0; }
.meta { border-radius:16px; background:var(--tint); padding:16px 22px; font-size:13px; }
.meta p { margin:3px 0; }
.toc { margin:28px 0 35px; border-bottom:1px solid var(--line); padding-bottom:20px; }
.toc summary { cursor:pointer; color:var(--accent); font-size:14px; }
.toc ol { padding-left:24px; font-size:14px; line-height:2.2; }
section { margin:0 0 38px; }
h2 { font-size:21px; line-height:1.6; margin:0 0 14px; font-weight:650; }
.section-number { color:var(--muted); font-size:13px; font-weight:400; margin-right:12px; }
section p { margin:12px 0; }
strong { font-weight:650; }
.references { display:flex; flex-wrap:wrap; gap:10px 22px; margin-top:18px; font-size:14px; }
.documents { display:grid; gap:14px; }
.document { display:flex; gap:20px; align-items:flex-start; color:var(--ink); text-decoration:none; background:var(--card); padding:24px; border:1px solid var(--line); border-radius:18px; }
.document>div { flex:1; }
.document h2 { margin:0 0 5px; font-size:20px; }
.document p { margin:0; color:var(--muted); font-size:14px; }
.number { color:var(--muted); font-size:13px; margin-top:5px; }
.note { padding:22px 24px; margin:26px 0 40px; background:var(--tint); border-radius:16px; font-size:14px; }
.note p { margin:8px 0 0; }
footer { margin-top:30px; padding-top:25px; padding-bottom:42px; border-top:1px solid var(--line); font-size:13px; }
footer nav { display:flex; flex-wrap:wrap; gap:12px 22px; }
footer>p { margin:22px 0 12px; color:var(--muted); }
@media(max-width:600px) {
  .masthead,main,footer { padding-left:22px; padding-right:22px; }
  .masthead { padding-top:24px; padding-bottom:24px; }
  .heading { padding-top:26px; }
  h1 { font-size:29px; }
  h2 { font-size:20px; }
  .document { gap:12px; padding:20px 17px; }
  .meta { padding:15px 18px; }
  .date { line-height:1.8; }
}
@media(prefers-color-scheme:dark) {
  :root { --bg:#172019; --card:#202b22; --ink:#e1e8db; --muted:#acb9a4; --accent:#b3d2a3; --line:#3c4b39; --tint:#283526; }
}
@media print {
  :root { --bg:#fff; --card:#fff; --ink:#111; --muted:#333; --accent:#111; --line:#ccc; --tint:#f5f5f5; }
  .masthead,.toc,footer,.skip { display:none; }
  main { max-width:none; padding:0; }
  body { font-size:11pt; }
  h1 { font-size:22pt; }
  h2 { break-after:avoid; font-size:15pt; }
  section p { orphans:3; widows:3; }
}