:root { --bg:#ffffff; --fg:#1f2328; --muted:#59636e; --link:#0b57d0; --line:#d8dee4; }
@media (prefers-color-scheme: dark) {
  :root { --bg:#14171a; --fg:#e6e8ea; --muted:#9aa4ad; --link:#8ab4f8; --line:#2d333b; }
}
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--fg);
  font:16px/1.65 -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 40px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
header a.brand { color: var(--fg); font-weight: 700; font-size: 1.15rem; text-decoration: none; }
nav { margin-top: 8px; }
nav a { margin-right: 16px; color: var(--link); text-decoration: none; }
nav a:hover { text-decoration: underline; }
main { padding-top: 28px; padding-bottom: 40px; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 12px; }
h2 { font-size: 1.2rem; margin: 28px 0 6px; }
p { margin: 0 0 14px; }
.muted { color: var(--muted); font-size: .92rem; }
a { color: var(--link); }
footer { padding-top: 16px; padding-bottom: 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }