:root {
  --blue: #003296;
  --yellow: #fdd22b;
  --ink: #071427;
  --muted: #526173;
  --paper: #f4f1e9;
  --white: #ffffff;
  --line: rgba(7, 20, 39, 0.15);
  --font: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.75;
}

a { color: var(--blue); }

a:focus-visible { outline: 3px solid var(--yellow); outline-offset: 3px; }

.wrap { width: min(1080px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  background: #020712;
  color: var(--white);
}

.nav {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nav img { display: block; width: 170px; height: auto; }

.nav-links { display: flex; gap: 22px; font-size: 0.9rem; font-weight: 700; }

.nav-links a { color: rgba(255, 255, 255, 0.82); text-decoration: none; }

.breadcrumb { padding: 22px 0 0; color: var(--muted); font-size: 0.88rem; }

.breadcrumb a { text-decoration: none; }

.hero { padding: 72px 0 64px; }

.eyebrow {
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

h1, h2, h3 { margin: 0; line-height: 1.25; text-wrap: balance; }

h1 { max-width: 900px; margin-top: 14px; font-size: clamp(2.4rem, 6vw, 4.7rem); }

.dek { max-width: 780px; margin: 24px 0 0; color: var(--muted); font-size: 1.14rem; }

.meta { display: flex; flex-wrap: wrap; gap: 12px 24px; margin-top: 24px; color: var(--muted); font-size: 0.86rem; }

.answer-box {
  margin-top: 34px;
  padding: 24px 28px;
  border-left: 7px solid var(--yellow);
  background: var(--blue);
  color: var(--white);
}

.answer-box b { display: block; color: var(--yellow); font-size: 0.82rem; }

.answer-box p { margin: 8px 0 0; font-size: 1.06rem; }

.article {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 54px;
  padding: 10px 0 80px;
}

.content section + section { margin-top: 50px; }

.content { min-width: 0; }

.content h2 { font-size: 2rem; }

.content h3 { margin-top: 26px; font-size: 1.25rem; }

.content p, .content ul, .content ol { margin: 16px 0 0; }

.content li + li { margin-top: 9px; }

.method-chain {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  padding: 0;
  list-style: none;
}

.method-chain li {
  min-height: 116px;
  margin: 0;
  padding: 17px;
  border-top: 5px solid var(--blue);
  background: var(--white);
  font-weight: 800;
}

.checklist {
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  padding: 15px 18px 15px 46px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.68);
}

.checklist li::before {
  position: absolute;
  top: 15px;
  left: 18px;
  color: var(--blue);
  content: "✓";
  font-weight: 900;
}

.note {
  padding: 20px;
  border: 1px solid var(--line);
  background: var(--white);
}

.note strong { color: var(--blue); }

.value-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.value-card {
  padding: 20px;
  border-top: 5px solid var(--yellow);
  background: var(--white);
}

.value-card h3 { margin: 0; }

.value-card p { margin: 10px 0 0; color: var(--muted); }

.fact-table-wrap { max-width: 100%; margin-top: 20px; overflow-x: auto; }

.fact-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  background: var(--white);
}

.fact-table th,
.fact-table td {
  padding: 15px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.fact-table th { background: var(--ink); color: var(--white); }

.fact-table td:first-child { width: 25%; font-weight: 800; }

.alert {
  margin-top: 22px;
  padding: 20px;
  border: 1px solid #e4c64e;
  background: #fff7cd;
}

.aside { align-self: start; position: sticky; top: 24px; }

.aside-card { padding: 22px; border-top: 6px solid var(--yellow); background: #071427; color: var(--white); }

.aside-card h2 { font-size: 1.2rem; }

.aside-card ul { padding-left: 19px; margin: 16px 0 0; color: rgba(255,255,255,.78); }

.aside-card a { color: var(--yellow); }

.source-list { padding-left: 20px; }

.cta {
  margin-top: 50px;
  padding: 28px;
  background: var(--yellow);
}

.cta h2 { font-size: 1.55rem; }

.cta p { margin: 10px 0 0; }

.cta a { display: inline-block; margin-top: 16px; font-weight: 900; }

footer { padding: 30px 0; background: #020712; color: rgba(255,255,255,.72); font-size: .86rem; }

footer a { color: var(--yellow); }

@media (max-width: 820px) {
  .article { grid-template-columns: 1fr; gap: 28px; }
  .aside { position: static; }
  .method-chain { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .value-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .wrap { width: min(100% - 28px, 1080px); }
  .nav { min-height: 62px; }
  .nav img { width: 142px; }
  .nav-links a:first-child { display: none; }
  .hero { padding: 50px 0 46px; }
  h1 { font-size: 2.45rem; }
  .method-chain { grid-template-columns: 1fr; }
}