:root {
  --ink: #1a2430;
  --body: #46566a;
  --muted: #6b7a8c;
  --line: #dde3ea;
  --paper: #f4f6f9;
  --blue: #1b4a8b;
  --blue-strong: #123a6e;
  --deep: #0d2b45;
  --green: #0d7a63;
  --max: 940px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.wrap { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.topbar { border-bottom: 1px solid var(--line); background: rgba(255,255,255,.92); backdrop-filter:saturate(1.4) blur(8px); }
.nav { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; }
.brand img { width: 134px; }
.back { color: var(--blue); font-size: 14px; font-weight: 700; }
.back:hover { color: var(--blue-strong); }
main { padding: 66px 0 95px; }
.meta { color: var(--green); font-size: 13px; font-weight: 800; letter-spacing:.02em; }
h1 { max-width: 810px; margin: 15px 0 18px; font-size: 38px; line-height: 1.28; letter-spacing:-.01em; }
.lede { max-width: 790px; margin-bottom: 32px; color: var(--body); font-size: 18px; }
.answer { margin: 0 0 50px; padding: 22px 25px; border-left: 4px solid var(--blue); background: #eef2f8; border-radius:0 6px 6px 0; }
.answer strong { display: block; margin-bottom: 6px; color: var(--blue); font-size: 14px; letter-spacing:.04em; }
.answer p { margin: 0; color: #26374a; font-size: 18px; }
.article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 215px; gap: 56px; align-items: start; }
.article h2 { margin: 42px 0 12px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 27px; line-height: 1.3; }
.article h3 { margin: 26px 0 7px; font-size: 20px; line-height: 1.4; }
.article p { color: var(--body); }
.article ul, .article ol { padding-left: 22px; color: var(--body); }
.article li + li { margin-top: 7px; }
.article table { width: 100%; border-collapse: collapse; margin: 21px 0; }
.article th, .article td { padding: 12px 13px; text-align: left; vertical-align: top; border: 1px solid var(--line); font-size: 14px; }
.article th { background: var(--paper); font-weight: 650; color: var(--ink); }
.quote { margin: 24px 0; padding: 18px 20px; border-left: 3px solid var(--green); color: #26374a; background: #f2f8f6; border-radius:0 6px 6px 0; }
.side { position: sticky; top: 24px; padding-top: 18px; border-top: 2px solid var(--ink); }
.side strong { display: block; margin-bottom: 9px; font-size: 14px; color: var(--ink); }
.side a { display: block; padding: 8px 0; color: var(--blue); font-size: 13px; }
.side a:hover { color: var(--blue-strong); }
.source { margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.source a { color: var(--blue); text-decoration: underline; text-underline-offset: 2px; }
footer { padding: 25px 0; color: #a8b6c6; background: var(--deep); font-size: 13px; }
@media (max-width: 760px) {
  h1 { font-size: 28px; }
  main { padding-top: 45px; }
  .article-grid { grid-template-columns: 1fr; gap: 35px; }
  .side { position: static; order: -1; }
  .article h2 { font-size: 25px; }
  .lede, .answer p { font-size: 16px; }
  .article { overflow-wrap: anywhere; }
  .article table { min-width: 650px; }
  .article-grid .article { overflow-x: auto; }
}
:focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }