:root {
  --bg: #faf7f2;
  --bg-soft: #f2ece3;
  --card: #ffffff;
  --ink: #2c332e;
  --ink-soft: #5f6a62;
  --line: #e3dcd1;
  --accent: #8a6a55;
  --accent-soft: #c8a893;
  --shadow: 0 10px 30px rgba(70, 55, 40, 0.08);
  --radius: 18px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1d1b;
    --bg-soft: #232623;
    --card: #242724;
    --ink: #ece8e1;
    --ink-soft: #a9b1a8;
    --line: #373d37;
    --accent: #c9a68c;
    --accent-soft: #6f5a49;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 22px; }
header.site {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}
header.site .bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; height: 62px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: .06em; }
.brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--accent-soft), var(--accent));
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 14%, transparent);
}
nav.top { display: flex; gap: 18px; font-size: 14px; color: var(--ink-soft); }
nav.top a { color: var(--ink-soft); }
nav.top a:hover { color: var(--accent); }
.hero { padding: 96px 0 60px; }
.eyebrow {
  font-size: 13px; letter-spacing: .34em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 18px;
}
h1 {
  font-family: "Songti SC", "Noto Serif SC", "Source Han Serif SC", serif;
  font-size: clamp(30px, 5.2vw, 46px);
  line-height: 1.35; margin: 0 0 20px; font-weight: 600;
}
h2 {
  font-family: "Songti SC", "Noto Serif SC", "Source Han Serif SC", serif;
  font-size: 24px; margin: 46px 0 14px; font-weight: 600;
}
h3 { font-size: 17px; margin: 26px 0 8px; }
p { color: var(--ink-soft); }
.lead { font-size: 18px; max-width: 40em; }
.actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 34px 0 0; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-size: 15px;
  border: 1px solid var(--line); color: var(--ink); background: var(--card);
  box-shadow: var(--shadow); transition: transform .18s ease, border-color .18s ease;
}
.btn:hover { transform: translateY(-2px); border-color: var(--accent); text-decoration: none; }
.btn.primary {
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 70%, #000 12%));
  color: #fff; border-color: transparent;
}
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 26px 0; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 22px 18px; box-shadow: var(--shadow);
}
.card h3 { margin-top: 0; }
.card p { margin: 6px 0 0; font-size: 14.5px; }
.note {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 14px;
  padding: 16px 20px; font-size: 14px; color: var(--ink-soft);
}
main.doc { padding: 54px 0 40px; }
main.doc h1 { font-size: clamp(26px, 4vw, 34px); }
main.doc h2 { font-size: 20px; margin-top: 34px; }
main.doc p, main.doc li { font-size: 15.5px; }
main.doc ul { padding-left: 1.3em; }
.updated { font-size: 13px; color: var(--ink-soft); letter-spacing: .05em; }
footer.site {
  margin-top: 80px; border-top: 1px solid var(--line); padding: 28px 0 46px;
  font-size: 13px; color: var(--ink-soft);
}
footer.site .row { display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center; justify-content: space-between; }
footer.site a { color: var(--ink-soft); }
.icp { letter-spacing: .04em; }
.steps { counter-reset: step; list-style: none; padding: 0; }
.steps li { position: relative; padding-left: 46px; margin: 18px 0; color: var(--ink-soft); }
.steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 2px;
  width: 30px; height: 30px; border-radius: 50%;
  display: grid; place-items: center; font-size: 14px;
  background: var(--bg-soft); border: 1px solid var(--line); color: var(--accent);
}
@media (max-width: 620px) {
  nav.top { display: none; }
  .hero { padding: 62px 0 34px; }
}