:root { color-scheme: light; }
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #1e293b;
  background: #f8fafc;
  line-height: 1.6;
}
header {
  border-bottom: 1px solid #e2e8f0;
  background: #fff;
}
header .bar {
  max-width: 760px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
header a.home { font-weight: 700; color: #0f172a; text-decoration: none; }
header a.back { color: #2563eb; text-decoration: none; font-size: 14px; }
main { max-width: 760px; margin: 0 auto; padding: 32px 20px 64px; }
h1 { font-size: 28px; margin: 0 0 4px; letter-spacing: -0.01em; }
.updated { color: #64748b; font-size: 14px; margin: 0 0 28px; }
h2 { font-size: 18px; margin: 32px 0 8px; }
p, li { color: #334155; }
a { color: #2563eb; }
ul { padding-left: 22px; }
.intro { background: #fff; border: 1px solid #e2e8f0; border-radius: 14px; padding: 16px 18px; }
footer { max-width: 760px; margin: 0 auto; padding: 24px 20px 48px; color: #94a3b8; font-size: 13px; }
footer a { color: #64748b; }
code { background: #f1f5f9; padding: 1px 5px; border-radius: 5px; font-size: 90%; }