:root { color-scheme: light; }
* { box-sizing: border-box; }
body {
  font-family: -apple-system, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #1c1c28;
  background: #f7f7fb;
  margin: 0;
  padding: 24px 18px 64px;
}
main {
  max-width: 760px;
  margin: 0 auto;
  background: #ffffff;
  border: 1px solid #e6e6ef;
  border-radius: 14px;
  padding: 28px 26px;
}
h1 { font-size: 1.6rem; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 28px 0 8px; }
.updated { color: #6b6b80; font-size: 0.9rem; margin: 0 0 20px; }
a { color: #2563eb; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
code { background: #f0f0f6; padding: 1px 6px; border-radius: 5px; font-size: 0.92em; }
.nav { max-width: 760px; margin: 0 auto 16px; font-size: 0.92rem; }
.nav a { margin-right: 14px; }
footer { max-width: 760px; margin: 22px auto 0; color: #8a8a9a; font-size: 0.85rem; text-align: center; }