:root{color-scheme:light dark;--fg:#1f2328;--muted:#59636e;--bg:#fff;--line:#d0d7de;--accent:#0969da}
@media(prefers-color-scheme:dark){:root{--fg:#e6edf3;--muted:#9198a1;--bg:#0d1117;--line:#30363d;--accent:#4493f8}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 -apple-system,"Segoe UI","Noto Sans TC","PingFang TC",sans-serif}
main{max-width:720px;margin:0 auto;padding:3rem 1.25rem 4rem}h1{font-size:1.7rem;margin:0 0 .25rem}h2{font-size:1.15rem;margin:2rem 0 .5rem;padding-top:1.25rem;border-top:1px solid var(--line)}
p,li{color:var(--fg)}.muted{color:var(--muted)}a{color:var(--accent)}code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em;background:rgba(127,127,127,.15);padding:.1em .35em;border-radius:4px}
.lang{display:flex;gap:.75rem;margin:0 0 1.5rem;font-size:.9rem}.lang a{text-decoration:none}nav{font-size:.9rem;margin-bottom:2rem}footer{margin-top:3rem;font-size:.85rem;color:var(--muted)}
.flow{white-space:pre;overflow-x:auto;font-family:ui-monospace,Menlo,monospace;font-size:.85rem;line-height:1.5;background:rgba(127,127,127,.1);padding:1rem;border-radius:8px}