:root {
  --bg: #f3f0e8;
  --ink: #1c1915;
  --side: #13241f;
  --gold: #b6893b;
  --muted: #6b6458;
  --line: #d9d2c4;
  --card: #faf8f2;
  --danger: #8b3a2a;
  --ok: #2f6b4f;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "Consolas", monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  min-height: 100vh;
}
a { color: var(--gold); text-decoration: none; }
a:hover { text-decoration: underline; }
.num, code, .mono { font-family: var(--mono); }

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--line);
  background: rgba(250, 248, 242, 0.9);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
}
.brand span { color: var(--gold); }
.nav-links { display: flex; flex-wrap: wrap; gap: 0.9rem; align-items: center; }
.nav-links a { color: var(--ink); text-decoration: none; font-size: 0.95rem; }
.nav-links a:hover { color: var(--gold); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--bg);
  padding: 0.55rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font: inherit;
  text-decoration: none;
}
.btn:hover { background: #2a2620; text-decoration: none; color: var(--bg); }
.btn.secondary {
  background: transparent;
  color: var(--ink);
}
.btn.secondary:hover { border-color: var(--gold); color: var(--gold); }
.btn.gold {
  background: var(--gold);
  border-color: var(--gold);
  color: #1c1915;
}
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn.block { width: 100%; }

.hero {
  max-width: 960px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 2rem;
}
.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  font-weight: 700;
}
.hero p.lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 40rem;
  margin: 0 0 1.5rem;
}
.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}
.meta-row strong { color: var(--ink); font-weight: 600; }

.section {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 2.5rem;
}
.section h2 {
  font-size: 1.25rem;
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.step {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1rem 1.1rem;
}
.step .n {
  color: var(--gold);
  font-family: var(--mono);
  font-size: 0.85rem;
  margin-bottom: 0.4rem;
}
.step h3 { margin: 0 0 0.35rem; font-size: 1rem; }
.step p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.chains {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.chip {
  border: 1px solid var(--line);
  background: var(--card);
  padding: 0.35rem 0.7rem;
  font-size: 0.9rem;
}

.auth-wrap {
  max-width: 420px;
  margin: 3rem auto;
  padding: 0 1.25rem 3rem;
}
.auth-card {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.5rem;
}
.auth-card h1 { margin: 0 0 0.35rem; font-size: 1.4rem; }
.auth-card .sub { color: var(--muted); margin: 0 0 1.25rem; font-size: 0.92rem; }
label { display: block; font-size: 0.9rem; margin: 0.75rem 0 0.35rem; }
input, select, textarea {
  width: 100%;
  font: inherit;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 4px;
}
.row-inline { display: flex; gap: 0.5rem; align-items: stretch; }
.row-inline input { flex: 1; }
.msg { margin-top: 0.85rem; font-size: 0.9rem; }
.msg.err { color: var(--danger); }
.msg.ok { color: var(--ok); }
.foot-link { margin-top: 1rem; font-size: 0.9rem; color: var(--muted); }

.docs {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}
.docs h1 { margin-top: 0; }
.docs h2 { margin-top: 2rem; font-size: 1.15rem; border-bottom: 1px solid var(--line); padding-bottom: 0.35rem; }
.docs pre {
  background: #1c1915;
  color: #f3f0e8;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.85rem;
  border-radius: 4px;
}
.docs table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.docs th, .docs td { border: 1px solid var(--line); padding: 0.45rem 0.55rem; text-align: left; }
.docs th { background: var(--card); }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.25rem 1.5rem 2rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

@media (max-width: 720px) {
  .steps { grid-template-columns: 1fr; }
  .site-nav { flex-direction: column; align-items: flex-start; }
}