:root {
  --ink: #14181f;
  --ink-2: #1d232c;
  --line: #d9dde4;
  --paper: #f4f5f7;
  --card: #ffffff;
  --text: #262d38;
  --muted: #5d6673;
  --accent: #2f4c8f;
  --accent-soft: #e6ecf9;
  --radius: 4px;
  --mono: "SFMono-Regular", "Menlo", "Consolas", monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.78;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 { font-weight: 700; line-height: 1.32; color: #161c25; }

h1 { font-size: 1.72rem; }
h2 { font-size: 1.28rem; margin-top: 2rem; }
h3 { font-size: 1.06rem; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 18px; }

/* ---------- 顶栏 ---------- */
.topbar {
  background: var(--ink);
  color: #eef1f6;
  border-bottom: 3px solid var(--accent);
}
.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.brand { display: flex; align-items: center; gap: 10px; color: #fff; }
.brand img { width: 38px; height: 38px; border-radius: 6px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-size: 1.05rem; font-weight: 700; letter-spacing: .04em; }
.brand-sub { font-size: .74rem; color: #9aa6bb; letter-spacing: .12em; text-transform: uppercase; }

.menu-toggle {
  margin-left: auto;
  display: none;
  background: #232a35;
  color: #fff;
  border: 1px solid #3a4352;
  border-radius: var(--radius);
  font-size: 1.25rem;
  padding: 6px 12px;
  cursor: pointer;
}

.nav { display: flex; flex-wrap: wrap; gap: 2px; margin-left: auto; }
.nav a {
  color: #dde3ee;
  padding: 7px 12px;
  font-size: .92rem;
  border-radius: var(--radius);
}
.nav a:hover { background: #2a3240; text-decoration: none; }
.nav a.is-active { background: var(--accent); color: #fff; }

/* ---------- 主体：左目录 + 右正文 ---------- */
.shell {
  display: grid;
  grid-template-columns: 216px minmax(0, 1fr);
  gap: 30px;
  padding: 30px 18px 44px;
  max-width: 1180px;
  margin: 0 auto;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 14px;
}
.sidebar-title {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--muted);
  text-transform: uppercase;
  margin: 0 0 10px;
}
.tree { list-style: none; margin: 0; padding: 0; }
.tree li { margin: 0; }
.tree a {
  display: block;
  padding: 6px 8px 6px 14px;
  border-left: 2px solid var(--line);
  font-size: .92rem;
  color: #3a4351;
}
.tree a:hover { border-left-color: var(--accent); background: var(--accent-soft); text-decoration: none; }
.tree a.is-active { border-left-color: var(--accent); color: var(--accent); font-weight: 700; background: var(--accent-soft); }

.main { min-width: 0; }

/* ---------- 首页 ---------- */
.hero {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 26px 24px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 26px;
  align-items: center;
}
.hero h1 { margin: 0 0 12px; }
.hero p { color: var(--muted); margin: 0 0 16px; }
.hero-figure img { border-radius: var(--radius); border: 1px solid var(--line); }
.kicker {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 8px;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 9px 20px;
  border-radius: var(--radius);
  font-size: .94rem;
}
.btn:hover { background: #253c72; text-decoration: none; color: #fff; }

section.block { margin-top: 26px; }
.block-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
  margin-bottom: 16px;
}
.block-head h2 { margin: 0; font-size: 1.16rem; }
.block-head span { font-family: var(--mono); font-size: .76rem; color: var(--muted); }

.stat-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.stat b { display: block; font-family: var(--mono); font-size: 1.2rem; color: #1b2434; }
.stat small { color: var(--muted); font-size: .82rem; }

.ledger { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.ledger table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.ledger th, .ledger td { padding: 9px 12px; border-bottom: 1px solid #e8ebf0; text-align: left; }
.ledger th { background: #f0f2f6; font-weight: 600; color: #39414f; font-size: .86rem; }
.ledger td:first-child { font-family: var(--mono); color: var(--muted); }
.ledger tr:last-child td { border-bottom: none; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 22px;
  align-items: start;
}

.feature-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.feature-list li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  grid-template-columns: 128px minmax(0, 1fr);
  gap: 14px;
  overflow: hidden;
}
.feature-list img { width: 128px; height: 100%; object-fit: cover; }
.feature-list div { padding: 10px 14px 12px 0; }
.feature-list h3 { margin: 0 0 4px; font-size: 1rem; }
.feature-list p { margin: 0; color: var(--muted); font-size: .88rem; }

.rail {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}
.rail h2 { font-size: 1rem; margin: 0 0 10px; }
.rail ul { list-style: none; margin: 0; padding: 0; }
.rail li { padding: 7px 0; border-bottom: 1px dashed #e3e7ee; font-size: .9rem; }
.rail li:last-child { border-bottom: none; }

.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.cat-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}
.cat-card h3 { margin: 0 0 6px; font-size: 1rem; }
.cat-card p { margin: 0 0 10px; color: var(--muted); font-size: .88rem; }
.cat-card a { font-size: .88rem; }

.quote-block {
  background: var(--ink-2);
  color: #e7ebf2;
  border-radius: var(--radius);
  padding: 24px;
}
.quote-block p { margin: 0 0 8px; color: #c3ccdd; }
.quote-block h2 { color: #fff; margin: 0 0 12px; }

.pic-band { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.pic-band figure { margin: 0; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.pic-band figcaption { padding: 10px 14px; font-size: .86rem; color: var(--muted); }

/* ---------- 栏目页 ---------- */
.page-head {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 22px 18px;
  margin-bottom: 22px;
}
.page-head h1 { margin: 0 0 8px; }
.page-head p { margin: 0; color: var(--muted); }
.crumb { font-size: .84rem; color: var(--muted); margin-bottom: 10px; }
.crumb a { color: var(--accent); }

.entry-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.entry {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 104px;
  gap: 16px;
  align-items: center;
}
.entry h2 { margin: 0 0 6px; font-size: 1.04rem; }
.entry p { margin: 0; color: var(--muted); font-size: .9rem; }
.entry img { width: 104px; border-radius: var(--radius); }
.entry .meta { font-family: var(--mono); font-size: .76rem; color: #8a93a2; margin-bottom: 4px; }

/* ---------- 文章页 ---------- */
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 288px;
  gap: 26px;
  align-items: start;
}

.article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px 30px;
}
.article h1 { margin: 8px 0 10px; }
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: .84rem;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
  margin-bottom: 18px;
}
.article-lead { font-size: 1.02rem; color: #38404d; }
.article figure { margin: 22px 0; }
.article figure img { border-radius: var(--radius); border: 1px solid var(--line); }
.article figcaption { font-size: .82rem; color: var(--muted); padding-top: 8px; }

.article h2 { border-left: 3px solid var(--accent); padding-left: 10px; }

.article ol, .article ul { padding-left: 1.3em; }
.article ol li, .article ul li { margin: 6px 0; }

.notebox {
  background: #eef1f6;
  border-left: 3px solid #7d8797;
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: .92rem;
  color: #3b4451;
  margin: 20px 0;
}

.faq { margin-top: 26px; }
.faq h2 { border-left-color: var(--accent); }
.faq-item { border-bottom: 1px solid #e8ebf0; padding: 12px 0; }
.faq-item h3 { margin: 0 0 6px; font-size: .98rem; }
.faq-item p { margin: 0; color: var(--muted); font-size: .92rem; }

.article-aside { display: grid; gap: 16px; position: sticky; top: 18px; }
.aside-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}
.aside-box h2 { font-size: .96rem; margin: 0 0 10px; }
.aside-box ul { list-style: none; margin: 0; padding: 0; }
.aside-box li { padding: 8px 0; border-bottom: 1px dashed #e3e7ee; font-size: .9rem; }
.aside-box li:last-child { border-bottom: none; }

.back-cat { margin-top: 26px; font-size: .92rem; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink);
  color: #b9c2d2;
  margin-top: 40px;
  border-top: 3px solid var(--accent);
}
.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 30px 18px 26px;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 26px;
}
.footer-inner h3 { color: #fff; font-size: .96rem; margin: 0 0 10px; }
.footer-inner p { margin: 0 0 6px; font-size: .86rem; color: #b9c2d2; }
.footer-inner a { color: #cfd8e8; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 8px; }
.footer-links a { font-size: .86rem; }
.footer-legal {
  border-top: 1px solid #2b3342;
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 18px 26px;
  font-size: .82rem;
  color: #96a1b4;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

@media (max-width: 980px) {
  .shell { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .sidebar { position: static; }
  .hero { grid-template-columns: minmax(0, 1fr); }
  .split { grid-template-columns: minmax(0, 1fr); }
  .article-layout { grid-template-columns: minmax(0, 1fr); }
  .article-aside { position: static; }
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  .nav { display: none; width: 100%; flex-direction: column; margin: 10px 0 0; }
  .nav.is-open { display: flex; }
  .topbar-inner { flex-wrap: wrap; }
  .menu-toggle { display: block; }
  .stat-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card-grid { grid-template-columns: minmax(0, 1fr); }
  .pic-band { grid-template-columns: minmax(0, 1fr); }
  .feature-list li { grid-template-columns: minmax(0, 1fr); }
  .feature-list img { width: 100%; height: 168px; }
  .feature-list div { padding: 12px 14px 14px; }
  .entry { grid-template-columns: minmax(0, 1fr); }
  .entry img { width: 100%; }
  .article { padding: 18px 16px 22px; }
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  h1 { font-size: 1.42rem; }
  .nav a { padding: 10px 12px; }
}