:root {
  --bg: #f3f4f6;
  --card: #ffffff;
  --ink: #12161c;
  --muted: #555c66;
  --amber: #ffb31a;
  --line: #e2e5ea;
  --link: #9a5b00;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --card: #1c222b;
    --ink: #eef0f3;
    --muted: #a8b0ba;
    --line: #2c333d;
    --link: #ffb31a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
.top { background: #12161c; color: #fff; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 60px; gap: 12px; flex-wrap: wrap; }
.brand { color: #fff; text-decoration: none; font-weight: 700; font-size: 20px; display: flex; align-items: center; gap: 10px; }
.mark { width: 28px; height: 28px; border-radius: 7px; background: var(--amber); display: inline-block; }
.top nav a { color: var(--amber); text-decoration: none; }
main { background: var(--card); margin-top: 24px; margin-bottom: 24px; padding-top: 8px; padding-bottom: 24px; border-radius: 16px; }
h1 { font-size: 28px; line-height: 1.25; margin: 24px 0 4px; }
h2 { font-size: 20px; margin: 28px 0 8px; padding-left: 10px; border-left: 4px solid var(--amber); }
.meta { color: var(--muted); margin-top: 0; }
.box { background: var(--bg); border-radius: 12px; padding: 14px 16px; margin: 16px 0; }
a { color: var(--link); }
hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
li { margin: 6px 0; }
code { background: var(--bg); padding: 1px 5px; border-radius: 4px; }
.foot { color: var(--muted); font-size: 14px; padding-bottom: 32px; }
.foot a { color: var(--muted); }