:root{--bg:#f6f7f9;--panel:#fff;--ink:#1d2330;--sub:#5d6677;--line:#e2e5ea;--acc:#1f6feb}
@media (prefers-color-scheme: dark){:root{--bg:#11141a;--panel:#191d25;--ink:#e6e9ef;--sub:#9aa3b2;--line:#2a303b;--acc:#58a6ff}}
*{box-sizing:border-box}html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:16px/1.7 system-ui,-apple-system,"Segoe UI","Hiragino Sans","Yu Gothic UI",Meiryo,sans-serif}
header{display:flex;gap:10px;align-items:center;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0}
header a.home{display:flex;gap:8px;align-items:center;color:inherit;text-decoration:none;font-weight:700}header img{width:26px;height:26px}
header button{margin-left:auto;background:var(--panel);color:inherit;border:1px solid var(--line);border-radius:999px;padding:3px 12px;cursor:pointer;font:inherit;font-size:13px}
main{max-width:820px;margin:0 auto;padding:16px}
article{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 20px}
h1{font-size:24px;margin:4px 0 4px}h2{font-size:17px;margin:22px 0 6px}p,li{color:var(--ink)}.muted{color:var(--sub);font-size:13.5px}
table{border-collapse:collapse;width:100%}th,td{border-top:1px solid var(--line);padding:9px 8px;text-align:left;vertical-align:top}th{width:32%;color:var(--sub);font-weight:600;font-size:14px}
@media(max-width:560px){th,td{display:block;width:100%;border:0;padding:4px 0}tr{display:block;border-top:1px solid var(--line);padding:8px 0}}
a{color:var(--acc)}
footer{max-width:820px;margin:0 auto;padding:18px 16px 40px;color:var(--sub);font-size:13px;display:flex;flex-wrap:wrap;gap:14px}
footer a{color:var(--sub)}
[data-l]{display:none}html[lang=ja] [data-l=ja],html[lang=en] [data-l=en]{display:block}
html[lang=ja] span[data-l=ja],html[lang=en] span[data-l=en]{display:inline}