:root{--bg:#fbfaf7;--fg:#1f2421;--muted:#5b625e;--accent:#21786d;--line:#e3e1db}
@media (prefers-color-scheme:dark){:root{--bg:#141716;--fg:#e8ebe9;--muted:#a3aba7;--accent:#5cc2b3;--line:#2b302e}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.75 -apple-system,"Hiragino Sans","Noto Sans JP",sans-serif;padding:32px 16px}
main{max-width:720px;margin:0 auto}h1{font-size:1.6rem;line-height:1.3}h2{font-size:1.15rem;margin-top:2rem;border-top:1px solid var(--line);padding-top:1rem}
a{color:var(--accent)}.muted{color:var(--muted);font-size:.9rem}ul{padding-left:1.2rem}nav{margin-bottom:1.5rem;font-size:.9rem}