:root {
  --ink: #2a1b12;
  --muted: #6f6259;
  --paper: #fffaf3;
  --line: #eadfce;
  --accent: #8b2f20;
  --accent-dark: #5d1f16;
  --warm: #f8ebd8;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.75;
}
a { color: var(--accent); }
a:hover { color: var(--accent-dark); }
.site-header {
  background: #2d211b;
  color: #fffaf3;
  padding: 20px max(24px, calc((100vw - 980px) / 2));
}
.brand { color: inherit; font-size: 18px; font-weight: 700; text-decoration: none; }
.brand small { display: block; color: #e7caa5; font-size: 13px; font-weight: 500; }
.toc {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  white-space: nowrap;
  padding: 12px max(24px, calc((100vw - 980px) / 2));
  background: rgba(255, 250, 243, .96);
  border-bottom: 1px solid var(--line);
}
.toc a { font-size: 14px; font-weight: 700; text-decoration: none; }
main { width: min(900px, calc(100% - 40px)); margin: 0 auto; }
article { padding: 46px 0 58px; }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-size: 14px; font-weight: 800; letter-spacing: .08em; }
h1, h2, h3 { color: #302017; line-height: 1.3; }
h1 { margin: 0; font-size: clamp(32px, 6vw, 52px); letter-spacing: -.04em; }
h2 { margin: 44px 0 14px; font-size: 27px; scroll-margin-top: 72px; }
h3 { margin: 24px 0 8px; font-size: 20px; }
.lead { max-width: 760px; margin: 18px 0 0; font-size: 21px; line-height: 1.65; }
.summary {
  margin: 30px 0;
  padding: 22px 24px;
  background: var(--warm);
  border-left: 5px solid var(--accent);
}
.facts {
  display: grid;
  grid-template-columns: 150px 1fr;
  margin: 24px 0;
  border: 1px solid var(--line);
  background: #fffdf9;
}
.facts dt, .facts dd { margin: 0; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.facts dt { font-weight: 800; background: #fdf5e9; }
.facts dd:last-child, .facts dt:nth-last-child(2) { border-bottom: 0; }
.card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.card { padding: 20px; border: 1px solid var(--line); background: #fffdf9; }
.card h3 { margin-top: 0; }
.notice { padding: 18px 20px; border: 1px solid #e4c9a1; background: #fff3df; }
.faq { padding: 18px 0; border-bottom: 1px solid var(--line); }
.faq h3 { margin: 0 0 6px; }
.links { padding-left: 20px; }
.links li { margin: 7px 0; }
.source { color: var(--muted); font-size: 14px; }
.cta {
  margin-top: 38px;
  padding: 26px;
  background: #3b241b;
  color: #fffaf3;
}
.cta h2 { margin-top: 0; color: inherit; }
.cta a { color: #f7d59e; font-weight: 800; }
footer { padding: 30px 20px; color: #eadfce; background: #2d211b; font-size: 14px; }
footer div { width: min(900px, 100%); margin: 0 auto; }
@media (max-width: 620px) {
  body { font-size: 16px; }
  main { width: min(100% - 30px, 900px); }
  article { padding-top: 30px; }
  .facts { grid-template-columns: 1fr; }
  .facts dt { padding-bottom: 4px; border-bottom: 0; }
  .facts dd { padding-top: 4px; }
  .card-grid { grid-template-columns: 1fr; }
  .lead { font-size: 19px; }
}