:root{color-scheme:light dark;--bg:#f6f7f9;--card:#fff;--ink:#1c1c1e;--muted:#5f6672;--rule:rgba(60,60,67,.14);--accent:#0f6fd6}
@media (prefers-color-scheme:dark){:root{--bg:#0b0d10;--card:#16191d;--ink:#f2f2f7;--muted:#9aa3af;--rule:rgba(235,235,245,.16);--accent:#6db3ff}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.8 -apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif}
main{max-width:720px;margin:0 auto;padding:40px 16px 80px}h1{font-size:26px;line-height:1.35;margin:0 0 4px}h2{font-size:18px;margin:32px 0 8px}
.meta{color:var(--muted);font-size:14px;margin:0 0 24px}section{background:var(--card);border:1px solid var(--rule);border-radius:14px;padding:4px 20px 16px;margin:16px 0}
a{color:var(--accent)}ul{padding-left:1.2em}nav{font-size:14px;margin-bottom:24px}nav a{margin-right:14px}.en{color:var(--muted)}footer{margin-top:40px;color:var(--muted);font-size:13px}