:root {
  color-scheme: light;
  --bg: #f3efe6;
  --paper: #fbf8f2;
  --ink: #1c1915;
  --muted: #5e574c;
  --line: #ddd4c4;
  --accent: #6e3428;
  --accent-soft: #f3e4dc;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 1.05rem;
  line-height: 1.75;
}
a { color: var(--accent); }
a:hover { text-decoration: none; }
.wrap { width: min(46rem, calc(100% - 2rem)); margin: 0 auto; }
header.site {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
header.site .wrap {
  padding: 0.85rem 0 0.95rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 1.1rem;
}
header.site .brand {
  text-decoration: none;
  font-weight: 700;
  color: var(--ink);
  margin-right: 0.4rem;
}
.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  column-gap: 1.35rem;
  row-gap: 0.65rem;
  font-size: 0.92rem;
  letter-spacing: 0.015em;
}
.site-nav a {
  display: inline-block;
  text-decoration: none;
  color: var(--muted);
  white-space: nowrap;
  padding: 0.2rem 0;
  line-height: 1.35;
  border-bottom: 1.5px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.site-nav a:hover {
  color: var(--ink);
  border-bottom-color: color-mix(in srgb, var(--ink) 28%, transparent);
}
.site-nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
  border-bottom-color: color-mix(in srgb, var(--ink) 45%, transparent);
}
main { padding: 2rem 0 3.5rem; }
h1 {
  font-family: "Palatino Linotype", "Songti SC", "Noto Serif SC", "Source Han Serif SC", serif;
  font-size: clamp(1.8rem, 4vw, 2.45rem);
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0.35rem 0 0.9rem;
}
h2 {
  font-size: 1.22rem;
  line-height: 1.4;
  margin: 2rem 0 0.65rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--line);
}
h3 {
  font-size: 1.06rem;
  line-height: 1.4;
  margin: 1.4rem 0 0.4rem;
}
p, li { color: var(--ink); }
.lede { font-size: 1.1rem; margin-top: 0; max-width: 40rem; }
.crumb {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0 0 0.35rem;
}
.crumb a { text-decoration: none; }
.crumb a:hover { text-decoration: underline; }
.note {
  background: transparent;
  border-left: 3px solid var(--accent);
  border-radius: 0;
  padding: 0.35rem 0 0.35rem 0.9rem;
  margin: 1.2rem 0;
}
.muted { color: var(--muted); }
ol, ul { padding-left: 1.25rem; }
li + li { margin-top: 0.35rem; }
code {
  font-family: "Cascadia Mono", "Consolas", "Sarasa Mono SC", monospace;
  font-size: 0.92em;
  background: var(--accent-soft);
  padding: 0.05em 0.35em;
  border-radius: 5px;
}
.guide-nav {
  margin: 1.4rem 0 0.4rem;
  padding: 0;
  border-top: 1px solid var(--line);
}
.guide-nav section {
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}
.guide-nav h2 {
  margin: 0 0 0.55rem;
  padding: 0;
  border: 0;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 650;
  font-family: "Segoe UI", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}
.guide-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.15rem;
}
.guide-nav a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.75rem;
  padding: 0.45rem 0;
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid transparent;
}
.guide-nav a:hover {
  color: var(--accent);
}
.guide-nav a strong {
  font-weight: 650;
}
.guide-nav a span {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 400;
}
.topic-list {
  list-style: none;
  padding: 0;
  margin: 0.4rem 0 0;
  border-top: 1px solid var(--line);
}
.topic-list li {
  margin: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  border-radius: 0;
}
.topic-list a {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.85rem 0;
  text-decoration: none;
  color: inherit;
}
.topic-list a:hover strong { color: var(--accent); text-decoration: underline; text-underline-offset: 0.18em; }
.topic-list strong {
  display: block;
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 650;
}
.topic-list span {
  display: block;
  color: var(--muted);
  font-size: 0.92rem;
}
.related {
  margin-top: 2.4rem;
  padding-top: 0.2rem;
}
.related h2 { margin-top: 0; }
.related ul {
  list-style: none;
  padding: 0;
  margin: 0.4rem 0 0;
  border-top: 1px solid var(--line);
}
.related li {
  margin: 0;
  border-bottom: 1px solid var(--line);
}
.related a {
  display: block;
  padding: 0.7rem 0;
  text-decoration: none;
}
.related a:hover { text-decoration: underline; text-underline-offset: 0.18em; }
details {
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 0.75rem 0;
  margin-top: 0;
}
details:first-of-type { border-top: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 650; }
footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 1.2rem 0 2rem;
  font-size: 0.92rem;
}
footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.85rem;
  align-items: baseline;
}
footer a { text-decoration: none; }
footer a:hover { text-decoration: underline; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 650;
  border: 1px solid transparent;
  margin: 0.25rem 0.35rem 0.25rem 0;
}
.btn-primary { background: var(--accent); color: #fff7f2; }
.btn-secondary {
  background: transparent;
  color: var(--accent);
  border-color: #d9c4b8;
}
.page-actions { margin: 1rem 0 0.4rem; }
.overview {
  display: grid;
  gap: 0.75rem;
  margin: 1.2rem 0;
  padding: 0.2rem 0 1rem;
  border-bottom: 1px solid var(--line);
}
.overview dl {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0.4rem 0.8rem;
  margin: 0;
}
.overview dt { color: var(--muted); }
.overview dd { margin: 0; }
.card {
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 0.85rem 0;
  margin: 0;
}
.card + .card { margin-top: 0; }
.card h3 { margin: 0 0 0.25rem; }
.card p { margin: 0.25rem 0 0; }
figure.step {
  margin: 0.85rem 0 1.15rem;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  overflow: hidden;
  background: transparent;
  padding-bottom: 0.75rem;
}
figure.step img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}
figure.step figcaption {
  padding: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}
@media (min-width: 900px) {
  .guide-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 2rem;
    border-top: 0;
  }
  .guide-nav section:nth-child(1),
  .guide-nav section:nth-child(2) {
    border-top: 1px solid var(--line);
  }
}