:root{--bg:#fff;--fg:#111;--sub:#555;--line:#e5e5e5;--card:#f6f6f6;--link:#0a7d32}
@media (prefers-color-scheme:dark){:root{--bg:#000;--fg:#f2f2f2;--sub:#aaa;--line:#2a2a2a;--card:#141414;--link:#5fd47f}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.75 -apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif}
main{max-width:720px;margin:0 auto;padding:32px 16px 64px}
h1{font-size:28px;margin:0 0 4px}h2{font-size:20px;margin:36px 0 8px;padding-top:12px;border-top:1px solid var(--line)}h3{font-size:17px;margin:20px 0 4px}
p,li{color:var(--fg)}.sub{color:var(--sub);font-size:14px}
a{color:var(--link)}
.card{background:var(--card);border-radius:16px;padding:16px 20px;margin:16px 0}
.btn{display:inline-block;background:var(--fg);color:var(--bg);text-decoration:none;font-weight:600;padding:12px 20px;border-radius:24px;margin-top:8px}
nav{display:flex;gap:16px;font-size:14px;margin-bottom:24px}
td{padding:6px 12px 6px 0;vertical-align:top;border-bottom:1px solid var(--line)}table{border-collapse:collapse;margin:8px 0}