:root{--bg:#fff;--ink:#1b1f27;--sub:#5b6270;--line:#e3e6eb;--accent:#0f6f5c}
@media (prefers-color-scheme:dark){:root{--bg:#14171c;--ink:#eceff3;--sub:#a3aab5;--line:#2a2f37;--accent:#5fd3b5}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.7 system-ui,-apple-system,"Segoe UI","Hiragino Sans","Yu Gothic UI",sans-serif}
main{max-width:720px;margin:0 auto;padding:40px 16px 64px}
h1{font-size:28px;margin:0 0 4px}h2{font-size:20px;margin:36px 0 8px;border-top:1px solid var(--line);padding-top:24px}
p,li{color:var(--ink)}.sub{color:var(--sub)}a{color:var(--accent)}
nav{display:flex;gap:16px;margin:8px 0 24px;flex-wrap:wrap}
footer{margin-top:48px;color:var(--sub);font-size:14px}