:root{color-scheme:light;--ink:#182d3a;--muted:#506373;--line:#dbe3e7;--accent:#126755;--paper:#fff;--back:#f1f5f3}*{box-sizing:border-box}body{margin:0;background:var(--back);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI","Meiryo",sans-serif;line-height:1.85}a{color:var(--accent);text-underline-offset:.2em}a:focus-visible{outline:3px solid var(--accent);outline-offset:4px}header,main,footer{max-width:900px;margin:auto;padding:24px}header{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}header a{font-weight:700;text-decoration:none}nav{display:flex;gap:20px;flex-wrap:wrap;font-size:.9rem}main{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:42px;margin-bottom:20px}h1{font-size:clamp(1.65rem,5vw,2.5rem);line-height:1.35;margin:12px 0 24px}h2{font-size:1.2rem;margin-top:34px}p,ul{margin:12px 0}.eyebrow{color:var(--accent);font-size:.8rem;font-weight:700;letter-spacing:.1em}.lead{font-size:1.12rem}.note{padding:18px 22px;border-left:4px solid var(--accent);background:var(--back);overflow-wrap:anywhere}.muted,footer{color:var(--muted);font-size:.9rem}code{overflow-wrap:anywhere;font-size:.9em}li{margin:8px 0}footer{padding-top:8px}.skip{position:absolute;left:-10000px}.skip:focus{left:16px;top:8px;background:white;padding:8px;z-index:2}@media(max-width:600px){header,footer{padding:20px}main{border-radius:0;padding:26px 20px}nav{gap:12px}}