:root {
  --bg: #f2f2f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --text2: #6c6c70;
  --line: #e3e3e8;
  --accent: #1d1d1f;
  --on-accent: #ffffff;
  --link: #0a5bc4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #f2f2f7;
    --text2: #aeaeb2;
    --line: #38383a;
    --accent: #f2f2f7;
    --on-accent: #000000;
    --link: #6fb1f2;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
header a { display: flex; align-items: center; gap: 12px; color: inherit; text-decoration: none; }
.mark { width: 40px; height: 40px; flex: none; }
.mark rect { fill: var(--accent); }
.mark path { stroke: var(--on-accent); }
.name { font-weight: 600; font-size: 19px; }
nav { margin-left: auto; display: flex; gap: 16px; font-size: 15px; }
h1 { font-size: 34px; line-height: 1.2; margin: 28px 0 6px; letter-spacing: -0.01em; }
.sub { color: var(--text2); margin: 0 0 24px; }
h2 { font-size: 20px; margin: 32px 0 10px; }
section { background: var(--card); border-radius: 20px; padding: 4px 20px 12px; margin: 16px 0; }
section h2 { margin-top: 18px; }
p, li { margin: 10px 0; }
ul, ol { padding-left: 22px; }
a { color: var(--link); }
code { font: 15px/1.4 Menlo, ui-monospace, monospace; background: var(--bg); padding: 1px 5px; border-radius: 6px; word-break: break-all; }
.note { color: var(--text2); font-size: 15px; }
footer { color: var(--text2); font-size: 14px; margin-top: 32px; }