:root{color-scheme:dark;--bg:#07111f;--panel:#0d1c2e;--text:#f5f8fb;--muted:#a9b9ca;--mint:#70e1c1;--line:#233a51}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 15% -5%,#163c4b 0,transparent 36%),var(--bg);color:var(--text);font-family:system-ui,-apple-system,"Noto Sans JP",sans-serif;line-height:1.75}.page{width:min(100% - 32px,760px);margin:0 auto;padding:28px 0 64px}.back{display:inline-flex;color:var(--mint);text-decoration:none;margin-bottom:20px}.box{background:rgba(13,28,46,.94);border:1px solid var(--line);border-radius:22px;padding:clamp(20px,5vw,38px)}h1{font-size:1.55rem;margin:0 0 8px}h2{font-size:1.05rem;margin:30px 0 8px;color:var(--mint)}p,li{color:var(--muted)}ul,ol{padding-left:1.3em}a{color:var(--mint)}.updated{font-size:.82rem;margin-top:0}.contact{margin-top:32px;padding-top:20px;border-top:1px solid var(--line)}