:root {
  color-scheme: light dark;
  --text: #1d1d1f;
  --secondary: #6e6e73;
  --bg: #fbfbfd;
  --card: #ffffff;
  --border: rgba(0, 0, 0, 0.08);
  --accent: #e8664f;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --secondary: #a1a1a6;
    --bg: #111113;
    --card: #1c1c1e;
    --border: rgba(255, 255, 255, 0.1);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
main { max-width: 720px; margin: 0 auto; padding: 56px 24px 72px; }
header { display: flex; align-items: center; gap: 16px; margin-bottom: 8px; }
header img { width: 64px; height: 64px; }
header a { color: inherit; text-decoration: none; font-weight: 600; font-size: 22px; }
nav { margin: 0 0 40px; font-size: 15px; color: var(--secondary); }
nav a { color: var(--secondary); margin-right: 16px; }
h1 { font-size: 34px; line-height: 1.15; margin: 0 0 6px; letter-spacing: -0.02em; }
h2 { font-size: 21px; margin: 32px 0 8px; }
.meta { color: var(--secondary); font-size: 15px; margin: 0 0 24px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 32px 24px;
  margin-bottom: 28px;
}
a { color: var(--accent); }
kbd {
  font: 600 14px/1 -apple-system, sans-serif;
  padding: 3px 7px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
}
ul, ol { padding-left: 22px; }
li { margin: 6px 0; }
footer { color: var(--secondary); font-size: 14px; margin-top: 40px; }