:root { --bg:#fff; --fg:#1d1d1f; --muted:#6e6e73; --link:#0066cc; --line:#e5e5ea; }
@media (prefers-color-scheme: dark) { :root { --bg:#000; --fg:#f5f5f7; --muted:#a1a1a6; --link:#4da3ff; --line:#2c2c2e; } }
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--fg); font:17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", sans-serif; }
main { max-width:720px; margin:0 auto; padding:32px 16px 64px; }
nav { display:flex; flex-wrap:wrap; gap:12px; font-size:15px; margin-bottom:32px; }
nav a[aria-current] { color:var(--fg); font-weight:600; text-decoration:none; }
a { color:var(--link); }
h1 { font-size:32px; line-height:1.2; margin:0 0 8px; }
h2 { font-size:21px; margin:32px 0 8px; }
.muted { color:var(--muted); font-size:15px; }
footer { border-top:1px solid var(--line); margin-top:48px; padding-top:16px; }
.app-icon { display:block; width:88px; height:88px; border-radius:22%; margin-bottom:20px; box-shadow:0 0 0 0.5px var(--line), 0 4px 16px rgba(0,0,0,.08); }