:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #16181d;
  --muted: #5d6470;
  --accent: #1f6fe5;
  --border: #e3e6eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --card: #161b24;
    --text: #e8eaee;
    --muted: #9aa3b0;
    --accent: #5b9bff;
    --border: #262d3a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-header, main, .site-footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 22px; padding-bottom: 22px; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); letter-spacing: .01em; }
.site-header nav { display: flex; gap: 18px; font-size: .95rem; }
main { padding-bottom: 48px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 12px 0 18px; }
h2 { font-size: 1.3rem; margin: 34px 0 10px; }
h3 { font-size: 1.1rem; margin: 26px 0 8px; }
p, ul { margin: 0 0 14px; }
ul { padding-left: 22px; }
li { margin-bottom: 6px; }
hr { border: 0; border-top: 1px solid var(--border); margin: 28px 0; }
blockquote { margin: 0 0 14px; padding: 10px 16px; border-left: 3px solid var(--accent); background: var(--card); border-radius: 8px; }
code { font-size: .9em; background: var(--card); border: 1px solid var(--border); border-radius: 6px; padding: 1px 6px; }
.lead { font-size: 1.15rem; color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 22px; margin: 18px 0; }
.card h2 { margin-top: 0; }
.muted { color: var(--muted); }
.links { display: flex; flex-wrap: wrap; gap: 10px 20px; }
.site-footer { display: flex; flex-wrap: wrap; gap: 8px 20px; padding-top: 22px; padding-bottom: 40px; border-top: 1px solid var(--border); font-size: .9rem; color: var(--muted); }
@media (max-width: 480px) {
  body { font-size: 16px; }
  h1 { font-size: 1.6rem; }
}