/* 第3套：对比侧栏 · burgundy 奶油 · 左栏固定 */
:root {
  --wine: #7a1f2b;
  --wine-d: #4e1219;
  --cream: #f4efe6;
  --paper: #fffdf8;
  --rule: #e0d4c2;
  --ink: #2b211c;
  --mute: #6b5b52;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: Georgia, "Songti SC", "SimSun", "Microsoft YaHei", serif;
  background: var(--cream);
  color: var(--ink);
  line-height: 1.8;
  font-size: 16px;
}
a { color: var(--wine); }
.frame {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}
.side {
  background: var(--wine-d);
  color: #f3e6dc;
  padding: 28px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
}
.side .mark {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  text-decoration: none;
  font-family: "Microsoft YaHei", sans-serif;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 28px;
}
.side .mark svg { width: 24px; height: 24px; }
.side nav a {
  display: block;
  color: #e8d4c8;
  text-decoration: none;
  padding: 10px 0;
  border-bottom: 1px solid #5a2a30;
  font-family: "Microsoft YaHei", sans-serif;
}
.side nav a.current { color: #f6d39a; font-weight: 700; }
.main { padding: 36px 48px 48px; background: var(--paper); }
.main h1 {
  font-size: 32px;
  line-height: 1.4;
  margin: 8px 0 16px;
  font-weight: 700;
}
.eyebrow {
  font-family: "Microsoft YaHei", sans-serif;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--wine);
}
.lede { font-size: 18px; margin-bottom: 22px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 18px 0 8px; }
.btn-wine {
  font-family: "Microsoft YaHei", sans-serif;
  background: var(--wine);
  color: #fff;
  text-decoration: none;
  padding: 10px 18px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-line {
  font-family: "Microsoft YaHei", sans-serif;
  border: 1px solid var(--wine);
  color: var(--wine);
  text-decoration: none;
  padding: 10px 18px;
}
.chapter { margin: 42px 0; }
.chapter h2 {
  font-size: 24px;
  border-left: 6px solid var(--wine);
  padding-left: 12px;
  margin-bottom: 14px;
}
table.diff {
  width: 100%;
  border-collapse: collapse;
  font-family: "Microsoft YaHei", sans-serif;
  font-size: 14px;
  background: #fff;
}
table.diff th, table.diff td {
  border: 1px solid var(--rule);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
table.diff th { background: var(--wine); color: #fff; }
table.diff tr:nth-child(even) td { background: #f8f1e8; }
.note {
  background: #f8efe3;
  border: 1px dashed var(--wine);
  padding: 14px 16px;
  margin: 16px 0;
}
.quote {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 16px 8px;
  font-style: italic;
  margin: 16px 0;
}
.faq-block + .faq-block { margin-top: 18px; }
.faq-block h3 {
  font-size: 17px;
  font-family: "Microsoft YaHei", sans-serif;
  margin-bottom: 6px;
}
.colophon {
  border-top: 2px solid var(--wine);
  margin-top: 48px;
  padding-top: 18px;
  font-family: "Microsoft YaHei", sans-serif;
  font-size: 12px;
  color: var(--mute);
}
.colophon a { margin-right: 12px; }
@media (max-width: 860px) {
  .frame { grid-template-columns: 1fr; }
  .side { position: relative; height: auto; }
  .main { padding: 24px 18px 36px; }
}