:root {
  --bg: #ffffff;
  --fg: #1a202c;
  --muted: #718096;
  --line: #e2e8f0;
  --link: #2b6cb0;
  --code-bg: #f7fafc;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171c;
    --fg: #e2e8f0;
    --muted: #a0aec0;
    --line: #2d3748;
    --link: #63b3ed;
    --code-bg: #1f2430;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 28px; line-height: 1.3; margin: 8px 0; }
h2 { font-size: 19px; margin: 32px 0 8px; }
a { color: var(--link); }
.meta, .back { color: var(--muted); font-size: 14px; }
code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; font-size: 14px; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 14px; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }
ul { padding-left: 22px; }
.hero { display: flex; align-items: center; gap: 14px; }
.hero img { width: 48px; height: 48px; }
.btn { display: inline-block; padding: 8px 16px; border-radius: 8px; background: var(--link); color: #fff; text-decoration: none; margin-right: 8px; }