:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6e6e73;
  --accent: #0a84ff;
  --border: #e5e5ea;
  --card: #f5f5f7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #f5f5f7;
    --muted: #98989d;
    --accent: #0a84ff;
    --border: #2c2c2e;
    --card: #1c1c1e;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  font-size: 17px;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 40px 22px 96px; }
header.site { padding-top: 8px; }
h1 { font-size: 30px; font-weight: 700; letter-spacing: -0.02em; margin: 0 0 6px; }
h2 { font-size: 21px; font-weight: 600; margin: 36px 0 10px; letter-spacing: -0.01em; }
p, li { color: var(--fg); }
.muted { color: var(--muted); }
.updated { color: var(--muted); font-size: 14px; margin: 0 0 8px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { padding-left: 22px; }
li { margin: 6px 0; }
hr { border: none; border-top: 1px solid var(--border); margin: 40px 0; }
.langbar { font-size: 14px; margin-bottom: 28px; }
.langbar a { margin-right: 14px; }
.nav { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.nav a {
  display: inline-block; padding: 12px 18px; background: var(--card);
  border: 1px solid var(--border); border-radius: 12px; color: var(--fg); font-weight: 500;
}
.footer { margin-top: 56px; color: var(--muted); font-size: 13px; }
code { background: var(--card); padding: 2px 6px; border-radius: 6px; font-size: 14px; }