:root {
  color-scheme: light;
  --bg: #f4f0e8;
  --paper: #fffdf8;
  --ink: #1c1917;
  --muted: #57534e;
  --line: #e7e0d4;
  --accent: #0f766e;
  --accent-ink: #ffffff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
}
a { color: var(--accent); }
.site-header, .site-footer, main { width: min(880px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 22px 0 8px;
}
.brand { color: var(--ink); font-weight: 750; text-decoration: none; letter-spacing: 0.04em; }
.site-header nav { display: flex; gap: 14px; flex-wrap: wrap; }
.site-header nav a { color: var(--muted); text-decoration: none; }
.site-header nav a:hover { color: var(--accent); }
.site-header nav a.nav-tool {
  color: var(--accent);
  font-weight: 650;
}
main { padding-bottom: 48px; }
article {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px 28px 12px;
}
h1 { font-size: 1.8rem; line-height: 1.35; margin: 0 0 12px; }
h2 { font-size: 1.2rem; margin: 28px 0 8px; }
h3 { font-size: 1rem; margin: 0 0 4px; }
.lede, .fine, .site-footer, .crumbs { color: var(--muted); }
.crumbs { font-size: 0.92rem; margin-bottom: 8px; }
.steps, .related, .catalog, .guide-grid { padding: 0; list-style: none; }
.steps li, .catalog li {
  border-top: 1px solid var(--line);
  padding: 12px 0;
}
.cta {
  margin: 22px 0;
  padding: 18px;
  border-radius: 14px;
  background: #f0fdfa;
  border: 1px solid #99f6e4;
}
.button {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-ink);
  text-decoration: none;
  border-radius: 999px;
  padding: 10px 18px;
  font-weight: 650;
}
.faqs details { border-top: 1px solid var(--line); padding: 10px 0; }
.faqs summary { cursor: pointer; font-weight: 650; }
.guide-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 20px 0 8px;
}
.guide-grid a, .catalog a { text-decoration: none; }
.guide-grid a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
}
.guide-grid a:hover { border-color: var(--accent); }
.guide-grid span, .catalog p { color: var(--muted); font-size: 0.92rem; }
.site-footer { padding: 8px 0 36px; font-size: 0.9rem; }
@media (min-width: 720px) {
  .guide-grid { grid-template-columns: 1fr 1fr; }
}