:root {
  --paper: #f3e6d0;
  --paper-2: #e8d4b4;
  --ink: #1a1410;
  --ink-2: #3a3128;
  --ink-3: #5c5146;
  --rule: #c4a882;
  --bar-high: #8b3a2a;
  --bar-mid: #c47a3a;
  --bar-low: #5a7a48;
  --card: #fff8ee;
  --sticky: #1a1410;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: auto; }
body {
  font-family: "Songti SC", "Source Han Serif SC", "Noto Serif SC", "SimSun", serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  font-size: 17px;
}
a { color: inherit; }
img, svg { display: block; }
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.mast {
  background: var(--ink);
  color: var(--paper);
  padding: 14px 0;
  border-bottom: 3px solid var(--bar-high);
}
.mast-row { display: flex; align-items: center; gap: 14px; }
.brand-mark { width: 28px; height: 28px; flex-shrink: 0; }
.brand { font-size: 15px; letter-spacing: 0.08em; }

.sticky-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--sticky);
  color: var(--paper-2);
  border-bottom: 1px solid #3a3128;
}
.sticky-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  padding: 10px 0;
  font-size: 13px;
  letter-spacing: 0.04em;
}
.sticky-nav a { text-decoration: none; color: #e8d4b4; }
.sticky-nav a:hover { color: #fff8ee; }

.hero { padding: 56px 0 40px; border-bottom: 1px solid var(--rule); }
.hero-kicker {
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--ink-3);
  margin-bottom: 12px;
}
h1 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.35;
  font-weight: 700;
  max-width: 18em;
  margin-bottom: 22px;
}
.hero p { max-width: 42em; margin-bottom: 14px; color: var(--ink-2); }

.section { padding: 48px 0; border-bottom: 1px solid var(--rule); }
h2 {
  font-size: clamp(22px, 2.6vw, 28px);
  line-height: 1.4;
  margin-bottom: 20px;
  max-width: 18em;
}
.lead { margin-bottom: 16px; color: var(--ink-2); max-width: 46em; }

.cost-bars { display: grid; gap: 14px; margin: 24px 0; }
.cost-row { display: grid; grid-template-columns: 140px 1fr 52px; gap: 12px; align-items: center; }
.cost-row span { font-size: 14px; color: var(--ink-3); }
.bar-track { height: 14px; background: #ddd0ba; border: 1px solid var(--ink); }
.bar-fill { height: 100%; }
.bar-fill.high { width: 92%; background: var(--bar-high); }
.bar-fill.mid { width: 64%; background: var(--bar-mid); }
.bar-fill.low { width: 22%; background: var(--bar-low); }
.cost-row strong { font-size: 13px; }

.layout-21 {
  display: grid;
  grid-template-columns: 1fr 1fr 280px;
  gap: 18px;
  margin-top: 22px;
}
.card {
  background: var(--card);
  border: 1px solid var(--ink);
  padding: 20px 18px;
  box-shadow: 4px 4px 0 var(--ink);
}
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { font-size: 15px; color: var(--ink-2); margin-bottom: 10px; }
.card p:last-child { margin-bottom: 0; }
.aside-card {
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  padding: 20px 18px;
}
.aside-card h3 { font-size: 18px; margin-bottom: 10px; color: var(--paper); }
.aside-card p { font-size: 15px; color: var(--paper-2); margin-bottom: 10px; }

.steps { counter-reset: step; display: grid; gap: 16px; margin-top: 18px; }
.step {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--ink);
  padding: 16px;
}
.step::before {
  counter-increment: step;
  content: counter(step);
  width: 44px;
  height: 44px;
  border: 2px solid var(--ink);
  display: grid;
  place-items: center;
  font-weight: 700;
}
.step h3 { font-size: 17px; margin-bottom: 8px; }
.step p { font-size: 15px; color: var(--ink-2); }

.table-wrap { overflow-x: auto; margin-top: 18px; }
table { width: 100%; border-collapse: collapse; background: var(--card); }
th, td { border: 1px solid var(--ink); padding: 10px 12px; text-align: left; font-size: 15px; vertical-align: top; }
th { background: var(--ink); color: var(--paper); font-weight: 600; }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 18px;
}
.split article {
  background: var(--card);
  border: 1px solid var(--ink);
  padding: 18px;
}
.split h3 { font-size: 17px; margin-bottom: 10px; }
.split p { font-size: 15px; color: var(--ink-2); margin-bottom: 10px; }

.faq { display: grid; gap: 12px; margin-top: 18px; }
.faq details {
  background: var(--card);
  border: 1px solid var(--ink);
  padding: 12px 16px;
}
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin-top: 10px; font-size: 15px; color: var(--ink-2); }

.site-footer {
  background: var(--ink);
  color: var(--paper-2);
  padding: 36px 0 28px;
  font-size: 14px;
}
.site-footer h2 { color: var(--paper); font-size: 18px; margin-bottom: 10px; }
.site-footer p { margin-bottom: 10px; max-width: 46em; }
.legal { margin-top: 18px; padding-top: 14px; border-top: 1px solid #5c5146; color: #c4a882; }

@media (max-width: 960px) {
  .layout-21 { grid-template-columns: 1fr 1fr; }
  .layout-21 .aside-card { grid-column: 1 / -1; }
}
@media (max-width: 720px) {
  .layout-21, .split, .cost-row { grid-template-columns: 1fr; }
  .sticky-nav ul { gap: 8px 12px; }
}