:root {
  --bg: #f5f5f5;
  --card: #ffffff;
  --text: #1a1a1a;
  --muted: #8a8a8a;
  --line: #ececec;
  --link: #2e7d32;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  font-family: "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
}
a { color: var(--link); }
.wrap {
  max-width: 720px;
  margin: 0 auto;
  min-height: 100vh;
  background: var(--card);
  padding: 20px 18px 40px;
}
.meta {
  color: var(--muted);
  font-size: 13px;
  margin: 0 0 16px;
}
h1 {
  font-size: 22px;
  margin: 0 0 8px;
  line-height: 1.4;
}
h2 {
  font-size: 17px;
  margin: 28px 0 10px;
}
h3 {
  font-size: 15px;
  margin: 18px 0 8px;
}
p, li { font-size: 15px; }
p { margin: 0 0 10px; }
ul { margin: 0 0 12px; padding-left: 1.2em; }
li { margin: 0 0 6px; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 8px 0 16px;
}
th, td {
  border: 1px solid var(--line);
  padding: 8px 6px;
  text-align: left;
  vertical-align: top;
  word-break: break-all;
}
th { background: #fafafa; }
.footer {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
.footer a { margin-right: 12px; }