:root {
  color-scheme: light dark;
  --text: #1d1d1f;
  --secondary: #6e6e73;
  --background: #fbfbfd;
  --card: #ffffff;
  --rule: #d2d2d7;
  --accent: #0a74e6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --secondary: #a1a1a6;
    --background: #000000;
    --card: #161617;
    --rule: #3a3a3c;
    --accent: #3ba0ff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
}
main { max-width: 700px; margin: 0 auto; padding: 56px 24px 72px; }
header { display: flex; align-items: center; gap: 18px; margin-bottom: 36px; }
header img { width: 72px; height: 72px; }
header h1 { margin: 0; font-size: 34px; line-height: 1.15; letter-spacing: -0.02em; }
header p { margin: 4px 0 0; color: var(--secondary); }
nav { display: flex; gap: 20px; margin: -16px 0 36px; font-size: 15px; }
h2 { font-size: 24px; letter-spacing: -0.01em; margin: 44px 0 12px; }
h3 { font-size: 18px; margin: 28px 0 6px; }
p, li { color: var(--text); }
ul { padding-left: 1.2em; }
li + li { margin-top: 6px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.card { background: var(--card); border: 1px solid var(--rule); border-radius: 18px; padding: 4px 22px 18px; margin-top: 16px; }
.muted { color: var(--secondary); font-size: 15px; }
code { font: 15px ui-monospace, "SF Mono", Menlo, monospace; }
footer { margin-top: 56px; padding-top: 18px; border-top: 1px solid var(--rule); color: var(--secondary); font-size: 14px; }
.card h3 { margin-top: 18px; }