:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  line-height: 1.7; margin: 0; padding: 0; color: #1c1c1e; background: #f7f7f9;
}
@media (prefers-color-scheme: dark) {
  body { color: #e6e6ea; background: #0c0c0e; }
  .card { background: #1a1a1d !important; }
}
.wrap { max-width: 720px; margin: 0 auto; padding: 32px 20px 64px; }
h1 { font-size: 1.6rem; margin: 0 0 4px; }
.sub { color: #8a8a8e; margin: 0 0 24px; font-size: .9rem; }
.card { background: #fff; border-radius: 16px; padding: 24px 22px; box-shadow: 0 1px 3px rgba(0,0,0,.06); }
h2 { font-size: 1.05rem; margin: 22px 0 6px; }
h2:first-of-type { margin-top: 4px; }
p { margin: 0 0 10px; }
.updated { color: #8a8a8e; font-size: .85rem; margin-top: 24px; }
a { color: #0a84ff; }
nav { display: flex; gap: 8px; margin: 0 0 20px; flex-wrap: wrap; }
nav a, .langbtn {
  font-size: .85rem; text-decoration: none; padding: 6px 12px; border-radius: 999px;
  background: rgba(120,120,128,.12); color: inherit; border: none; cursor: pointer;
}
nav a.active, .langbtn.active { background: #0a84ff; color: #fff; }
.foot { margin-top: 28px; font-size: .8rem; color: #8a8a8e; text-align: center; }