body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #17202a;
  background: #f6f7f9;
  line-height: 1.7;
}
main {
  width: min(760px, calc(100vw - 32px));
  margin: 40px auto;
  padding: 28px;
  background: #fff;
  border: 1px solid #e2e7ed;
  border-radius: 8px;
}
h1 { margin-top: 0; font-size: 28px; }
h2 { margin-top: 28px; font-size: 18px; }
p, li { font-size: 15px; }
li { margin: 8px 0; }
.meta { color: #5c6b7a; font-size: 14px; }
.note {
  margin-top: 24px;
  padding: 14px 16px;
  border-radius: 8px;
  background: #f0f7fa;
  color: #1a4d56;
}
footer {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid #e2e7ed;
  font-size: 14px;
  color: #5c6b7a;
}
a { color: #007a80; }
ul.links { padding-left: 1.2em; }
ul.links li { margin: 12px 0; }
code {
  font-size: 13px;
  background: #f0f2f5;
  padding: 2px 6px;
  border-radius: 4px;
}