:root {
  --ink: #12355b;
  --paper: #fff8f0;
  --brick: #b83b3b;
  --brick-dark: #8f2c2c;
  --rule: #e4d3c0;
  --body: #2a2a28;
  --fade: #6b645c;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--paper);
  color: var(--body);
  font-family: Georgia, "Songti SC", "SimSun", serif;
  font-size: 17px;
  line-height: 1.85;
}

a { color: var(--brick); }
a:hover { color: var(--ink); }

.masthead {
  text-align: center;
  padding: 36px 20px 18px;
  border-bottom: 4px double var(--ink);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 28px;
  color: var(--ink);
  letter-spacing: 0.18em;
  text-decoration: none;
  font-weight: 700;
}

.brand svg { width: 30px; height: 30px; }

.deck {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--fade);
  margin-top: 8px;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-top: 18px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

.nav a {
  color: var(--ink);
  text-decoration: none;
  padding: 0 16px;
  border-right: 1px solid var(--rule);
}

.nav a:last-child { border-right: 0; }

.nav a.is-current {
  color: var(--brick);
  font-weight: 700;
}

.page { width: min(1100px, calc(100% - 40px)); margin: 0 auto; padding: 36px 0 56px; }

.hero-rule {
  font-size: 38px;
  line-height: 1.28;
  color: var(--ink);
  max-width: 16em;
  margin-bottom: 18px;
}

.lead {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  color: var(--fade);
  max-width: 40em;
  margin-bottom: 20px;
}

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 8px 0 28px; }

.btn {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  display: inline-block;
  padding: 10px 22px;
  text-decoration: none;
  font-size: 15px;
}

.btn-main { background: var(--brick); color: #fff; }
.btn-main:hover { background: var(--brick-dark); color: #fff; }
.btn-sub { border: 1px solid var(--ink); color: var(--ink); }

.cols-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin: 28px 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
}

.cols-3 article {
  border-top: 3px solid var(--ink);
  padding-top: 12px;
}

.cols-3 h3 { color: var(--ink); font-size: 16px; margin-bottom: 8px; }

.chapter { margin: 42px 0; }

.chapter h2 {
  font-size: 26px;
  color: var(--ink);
  margin-bottom: 12px;
}

.chapter p { margin-bottom: 14px; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

th, td {
  border: 1px solid var(--rule);
  padding: 10px 12px;
  text-align: left;
}

th { background: var(--ink); color: #fff; }

.pull {
  border-left: 4px solid var(--brick);
  padding: 4px 0 4px 18px;
  margin: 18px 0;
  color: var(--ink);
  font-style: italic;
}

.faq-item { margin: 20px 0; }
.faq-item h3 {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  color: var(--brick-dark);
  margin-bottom: 6px;
}

.dl-strip { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; }

.site-foot {
  border-top: 4px double var(--ink);
  padding: 22px 20px 28px;
  text-align: center;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  color: var(--fade);
}

.site-foot .safe { color: var(--ink); margin: 8px 0; }
.site-foot a { color: var(--ink); }

@media (max-width: 800px) {
  .hero-rule { font-size: 28px; }
  .cols-3 { grid-template-columns: 1fr; }
  .nav { flex-wrap: wrap; }
}