:root{--ink:#071a33;--blue:#2878ff;--paper:#f6f8fc;--muted:#52627a}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.85 Inter,"Noto Sans JP",system-ui,sans-serif}header,main,footer{max-width:1000px;margin:auto;padding-left:24px;padding-right:24px}header{height:76px;display:flex;align-items:center;justify-content:space-between}.brand{font-weight:850;color:var(--ink);text-decoration:none}.open,.cta{background:var(--blue);color:#fff;text-decoration:none;border-radius:999px;padding:11px 17px;font-weight:750}.crumb{font-size:.86rem;color:var(--muted);margin:20px 0}.crumb a,.text-link,li a{color:#185fdf}main{padding-top:28px;padding-bottom:80px}.guide-layout{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:45px;align-items:start}article{background:#fff;border-radius:24px;padding:clamp(28px,6vw,64px);box-shadow:0 12px 35px #0d2a540b}.eyebrow{font-size:.75rem;letter-spacing:.14em;font-weight:800;color:var(--blue)}h1{font-size:clamp(2.2rem,5vw,4.2rem);line-height:1.1;letter-spacing:-.06em;margin:.2em 0}.lead{font-size:1.08rem;color:var(--muted);margin:1.3em 0 2em}h2{font-size:1.4rem;line-height:1.3;margin-top:2.5em}li{margin:.65em 0}aside{align-self:start;background:#e7efff;padding:22px;border-radius:18px}.langs{display:flex;flex-wrap:wrap;gap:8px}.langs a{background:#fff;border-radius:7px;padding:4px 9px;font-size:.8rem;text-decoration:none}.cta{display:inline-block;margin:8px 0 12px;font-size:1rem}.cta span{padding-left:7px}details{border-top:1px solid #dae2ed;padding:14px 0}summary{font-weight:750;cursor:pointer}footer{border-top:1px solid #dbe3ee;padding-top:30px;padding-bottom:35px;color:var(--muted);font-size:.85rem}@media(max-width:760px){main{padding:10px 16px 48px}.guide-layout{display:block}header,footer{padding-left:16px;padding-right:16px}aside{margin-top:20px}article{padding:28px 22px}.open{font-size:.84rem;padding:9px 13px}}
.article-meta{margin:0 0 26px;padding:14px 16px;border-left:3px solid var(--blue);background:#f4f7fd;color:var(--muted);font-size:.9rem;line-height:1.7}.article-meta strong{color:var(--ink)}.checklist{padding-left:1.35em}.checklist li::marker{color:var(--blue)}