:root {
  --bg: #f4f1ed;
  --surface: #ffffff;
  --ink: #1b1816;
  --muted: #726a65;
  --rule: #d7d0ca;
  --accent: #b14b2a;
  --accent-soft: #f7e7df;
  --max: 1040px;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family:
    Inter,
    -apple-system,
    BlinkMacSystemFont,
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
}
.container {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}
.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid color-mix(in srgb, var(--rule) 78%, transparent);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(14px);
}
.nav-inner {
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  font-weight: 750;
  text-decoration: none;
  letter-spacing: -0.02em;
}
.nav-links {
  display: flex;
  gap: 18px;
  align-items: center;
  font-size: 14px;
  color: var(--muted);
}
.nav-links a {
  text-decoration: none;
}
.nav-links a:hover {
  color: var(--accent);
}
.hero {
  padding: 92px 0 72px;
  border-bottom: 1px solid var(--rule);
}
.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
h1,
h2,
h3 {
  line-height: 1.18;
  letter-spacing: -0.035em;
}
h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(42px, 7vw, 72px);
}
.lead {
  max-width: 760px;
  margin: 26px 0 0;
  color: #443b36;
  font-size: clamp(18px, 2.5vw, 22px);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}
.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  text-decoration: none;
  font-weight: 700;
}
.button.primary {
  border-color: var(--accent);
  color: #fff;
  background: var(--accent);
}
.button:hover {
  transform: translateY(-1px);
}
.article {
  padding: 64px 0 88px;
}
.toc {
  margin-bottom: 48px;
  padding: 20px 22px;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--surface);
}
.toc strong {
  display: block;
  margin-bottom: 8px;
}
.toc a {
  margin-right: 16px;
  color: var(--accent);
  text-decoration: none;
}
.article section {
  scroll-margin-top: 90px;
  margin-top: 58px;
}
.article h2 {
  max-width: 760px;
  margin: 0 0 18px;
  font-size: clamp(29px, 4vw, 42px);
}
.article h3 {
  margin: 0 0 10px;
  font-size: 21px;
}
.article p,
.article li {
  max-width: 790px;
  color: #443b36;
}
.article p {
  margin: 0 0 18px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.card {
  padding: 24px;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--surface);
}
.card p {
  margin-bottom: 0;
}
.callout {
  margin: 28px 0;
  padding: 24px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
}
.callout strong {
  display: block;
  margin-bottom: 6px;
}
.checklist {
  padding-left: 1.2em;
}
.checklist li {
  margin: 9px 0;
}
.table-wrap {
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--rule);
  border-radius: 10px;
}
table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: var(--surface);
}
th,
td {
  padding: 15px 16px;
  border-bottom: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}
th {
  color: var(--muted);
  font-size: 13px;
}
tr:last-child td {
  border-bottom: 0;
}
.faq details {
  max-width: 820px;
  padding: 18px 0;
  border-bottom: 1px solid var(--rule);
}
.faq summary {
  cursor: pointer;
  font-weight: 750;
}
.faq details p {
  margin-top: 12px;
}
.related {
  padding: 28px;
  border-radius: 12px;
  color: #fff;
  background: #321f18;
}
.related a {
  color: #fff;
}
.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 14px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-links a {
  text-decoration: none;
}
@media (max-width: 720px) {
  .container {
    width: min(100% - 28px, var(--max));
  }
  .nav-inner {
    min-height: 58px;
  }
  .nav-links a:not(:last-child) {
    display: none;
  }
  .hero {
    padding: 66px 0 52px;
  }
  h1 {
    font-size: 42px;
  }
  .article {
    padding-top: 44px;
  }
  .grid {
    grid-template-columns: 1fr;
  }
  .toc a {
    display: block;
    margin: 7px 0;
  }
}