:root{--bg:#f6f5f0;--ink:#243b35;--muted:#5c695f;--green:#163e36;--line:#dce1d5;--card:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#111e29;--ink:#e6efe9;--muted:#a8b8b0;--green:#a9d6cd;--line:#2c4352;--card:#18293a}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif;line-height:1.8}
main{max-width:720px;margin:0 auto;padding:32px 16px 64px}h1{font-size:28px;margin:8px 0 4px;color:var(--green)}h2{font-size:18px;margin:32px 0 8px}h3{font-size:15px;margin:18px 0 4px}
.eyebrow{font-size:11px;letter-spacing:2px;color:var(--muted)}section{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:4px 18px 14px;margin:16px 0}
a{color:var(--green)}p,li{font-size:14px}small,.muted{color:var(--muted);font-size:12px}nav{display:flex;gap:16px;margin:14px 0 0;font-size:13px}footer{margin-top:40px;font-size:12px;color:var(--muted)}