:root {
  --bg: #ffffff; --fg: #111418; --muted: #5b6470; --accent: #1f6feb; --card: #f4f6f8; --border: #dde2e8;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0e1116; --fg: #e8ebef; --muted: #9aa4b1; --accent: #4c8dff; --card: #171b22; --border: #2a303a; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 32px 16px 64px; }
header.site {
  max-width: 680px; margin: 0 auto; padding: 16px;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px;
}
header.site > a { color: inherit; text-decoration: none; font-weight: 700; font-size: 18px; }
nav { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 15px; }
nav a { text-decoration: none; }
nav a[aria-current="page"] { color: var(--fg); font-weight: 600; }
h3 { font-size: 17px; margin: 24px 0 4px; }
h1 { font-size: 28px; line-height: 1.2; margin: 8px 0 12px; }
h2 { font-size: 20px; margin-top: 32px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); }
a { color: var(--accent); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 20px; margin: 20px 0; }
.btn {
  display: block; text-align: center; padding: 14px 16px; border-radius: 12px; margin: 10px 0;
  background: var(--accent); color: #fff; font-weight: 600; text-decoration: none;
}
.btn.secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.code { font: 600 22px/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 2px; word-break: break-all; }
[hidden] { display: none !important; }
footer { max-width: 680px; margin: 0 auto; padding: 24px 16px; font-size: 14px; }
footer { border-top: 1px solid var(--border); }
footer p { margin: 12px 0 0; }
footer > a { margin-right: 16px; }
a { overflow-wrap: anywhere; }