body {
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  line-height: 1.65;
  max-width: 72rem;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 3rem;
  color: #1a1a1a;
  background: #f7f6f3;
}
h1 { font-size: 1.55rem; margin: 0 0 0.75rem; }
h2 { font-size: 1.2rem; margin: 1.6rem 0 0.6rem; }
h3 { font-size: 1.05rem; margin: 1.2rem 0 0.4rem; }
p, li { font-size: 0.95rem; }
nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.85rem;
  margin: 0 0 1.25rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid #d8d4cc;
  font-size: 0.85rem;
}
nav a { color: #2d4a8f; }
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.88rem;
  background: #fff;
}
th, td {
  border: 1px solid #d8d4cc;
  padding: 0.4rem 0.55rem;
  vertical-align: top;
  text-align: left;
}
th { background: #eeeae3; }
.callout {
  background: #fff8e6;
  border: 1px solid #e6d7a8;
  padding: 0.7rem 0.9rem;
  margin: 0.9rem 0;
}
.callout.warn { background: #fdeeee; border-color: #e8b4b4; }
code { font-family: Consolas, "Courier New", monospace; font-size: 0.88em; }
a { color: #2d4a8f; }
ol.steps li { margin: 0.35rem 0; }