:root {
  --red: #8b1e1e;
  --red-deep: #5e1212;
  --paper: #faf6ed;
  --panel: #fffaf0;
  --ink: #1a1410;
  --muted: #6f6256;
  --gold: #b8923a;
  --line: rgba(26, 20, 16, .14);
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  --sans: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  line-height: 1.8;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
.container { width: min(980px, calc(100% - 40px)); margin: 0 auto; }
.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(184,146,58,.28);
  background: rgba(250,246,237,.94);
  backdrop-filter: blur(14px);
}
.nav-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { color: var(--red-deep); text-decoration: none; font-family: var(--serif); font-weight: 800; font-size: 22px; }
.nav-links { display: flex; gap: 20px; align-items: center; font-size: 14px; }
.nav-links a { text-decoration: none; }
.nav-links a:hover { color: var(--red); }
.article-hero { padding: 56px 0 36px; }
.breadcrumb { margin-bottom: 18px; color: var(--muted); font-size: 13px; }
.breadcrumb a { color: var(--red); }
.kicker { margin: 0 0 10px; color: var(--red); font-size: 12px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
h1, h2, h3 { font-family: var(--serif); line-height: 1.2; }
h1 { margin: 0 0 18px; font-size: clamp(40px, 7vw, 72px); }
.dek { max-width: 780px; margin: 0; color: var(--muted); font-size: clamp(17px, 2.2vw, 21px); }
.hero-art { width: 100%; margin-top: 32px; aspect-ratio: 2 / 1; object-fit: cover; border: 1px solid var(--line); }
.art-note { margin: 8px 0 0; color: var(--muted); font-size: 12px; text-align: right; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 54px; padding: 30px 0 80px; align-items: start; }
.article-body { min-width: 0; }
.article-body h2 { margin: 46px 0 14px; font-size: clamp(28px, 4vw, 40px); }
.article-body h3 { margin: 28px 0 8px; font-size: 24px; }
.article-body p { margin: 0 0 18px; }
.lead { font-family: var(--serif); font-size: 22px; line-height: 1.7; }
.fact-box, .tip-box {
  margin: 28px 0;
  padding: 24px;
  border-left: 4px solid var(--red);
  background: var(--panel);
  box-shadow: 0 12px 30px rgba(63,35,19,.06);
}
.fact-box strong, .tip-box strong { display: block; margin-bottom: 8px; color: var(--red-deep); font-family: var(--serif); font-size: 20px; }
.steps { counter-reset: step; display: grid; gap: 14px; margin: 24px 0; padding: 0; list-style: none; }
.steps li { position: relative; padding: 18px 18px 18px 62px; border: 1px solid var(--line); background: rgba(255,250,240,.72); }
.steps li::before { counter-increment: step; content: counter(step); position: absolute; left: 18px; top: 18px; width: 28px; height: 28px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--red); font-weight: 800; }
.method-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 24px 0; }
.method-card { padding: 22px; border: 1px solid var(--line); background: var(--panel); }
.method-card h3 { margin-top: 0; }
.toc { position: sticky; top: 92px; padding: 20px; border: 1px solid var(--line); background: rgba(255,250,240,.82); }
.toc strong { font-family: var(--serif); }
.toc a { display: block; margin-top: 10px; color: var(--muted); font-size: 14px; }
.sources { margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--line); }
.sources li { margin-bottom: 8px; }
.sources a { color: var(--red); overflow-wrap: anywhere; }
.related { padding: 56px 0; color: var(--paper); background: var(--ink); }
.related h2 { margin-top: 0; font-size: 34px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.related-card { padding: 22px; border: 1px solid rgba(250,246,237,.18); text-decoration: none; }
.related-card:hover { border-color: var(--gold); }
.related-card b { display: block; margin-bottom: 6px; color: #f4d995; font-family: var(--serif); font-size: 21px; }
.related-card span { color: rgba(250,246,237,.7); font-size: 14px; }
footer { padding: 34px 0; color: rgba(250,246,237,.7); background: #100d0b; font-size: 13px; }
footer a { color: #f4d995; }
@media (max-width: 760px) {
  .nav-links a:not(:last-child) { display: none; }
  .article-layout { grid-template-columns: 1fr; }
  .toc { position: static; order: -1; }
  .method-grid, .related-grid { grid-template-columns: 1fr; }
  .hero-art { aspect-ratio: 16 / 10; }
}