:root{--ink:#122435;--muted:#526170;--nav:#071827;--brand:#007f70;--brand-soft:#eaf8f4;--line:#d9e2e8;--paper:#fff;--bg:#f4f7f9;--warn:#fff7e7;--warn-line:#d69b2d;--max:880px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Noto Sans JP","Hiragino Sans","Yu Gothic UI","Yu Gothic",sans-serif;line-height:1.8}
a{color:#006c76;text-underline-offset:.2em}
.skip-link{position:fixed;left:1rem;top:-5rem;z-index:100;padding:.7rem 1rem;background:#fff;color:#000}.skip-link:focus{top:1rem}
.site-header{height:64px;background:var(--nav);color:#fff;display:flex;align-items:center;padding:0 24px}.brand{font-weight:800;letter-spacing:.04em}.brand span{margin-left:.6rem;color:#61d3c0;font-size:.7rem}
.shell{display:grid;grid-template-columns:280px minmax(0,1fr);min-height:calc(100vh - 64px)}
.sidebar{background:var(--nav);color:#fff;padding:32px 22px}.sidebar nav{position:sticky;top:24px}.nav-label{font-size:.68rem;color:#61d3c0;letter-spacing:.16em;font-weight:800}.sidebar ul{list-style:none;padding:0;margin:1rem 0}.sidebar li+li{margin-top:.35rem}.sidebar a{display:block;padding:.65rem .75rem;border-radius:8px;color:#dce7ee;text-decoration:none;font-size:.88rem}.sidebar a:hover,.sidebar a[aria-current="page"]{background:#123349;color:#fff}.sidebar .group{margin-top:1.3rem;border-top:1px solid #284253;padding-top:1rem}
main{width:100%;max-width:var(--max);padding:48px 34px 72px;margin:0 auto}.kicker{margin:0 0 .5rem;color:var(--brand);font-size:.72rem;font-weight:800;letter-spacing:.14em}h1{margin:.2rem 0 1rem;font-size:clamp(2rem,5vw,3.4rem);line-height:1.18;letter-spacing:-.03em}h2{margin:0 0 1rem;font-size:1.55rem;line-height:1.35}h3{margin:.1rem 0 .5rem;font-size:1.05rem}.lead{font-size:1.08rem;color:var(--muted);max-width:50rem}.hero-note,.notice{padding:1rem 1.15rem;border-left:4px solid var(--brand);background:var(--brand-soft);border-radius:0 10px 10px 0}.section{margin-top:42px;padding-top:38px;border-top:1px solid var(--line)}
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.card{display:block;padding:20px;border:1px solid var(--line);border-radius:14px;background:var(--paper);box-shadow:0 8px 24px rgba(18,36,53,.05);text-decoration:none;color:inherit}.card:hover{border-color:#6ab8ae}.card p{margin:.4rem 0 0;color:var(--muted)}
.steps{counter-reset:step;list-style:none;padding:0}.steps li{position:relative;margin:0 0 14px;padding:18px 18px 18px 58px;background:var(--paper);border:1px solid var(--line);border-radius:12px}.steps li:before{counter-increment:step;content:counter(step);position:absolute;left:18px;top:18px;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:var(--brand);color:#fff;font-weight:800}.steps p{margin:.35rem 0 0;color:var(--muted)}
.checklist{padding-left:1.25rem}.checklist li+li{margin-top:.5rem}.warning{background:var(--warn);border:1px solid #efd49c;border-left:4px solid var(--warn-line);border-radius:10px;padding:16px 18px}.source-list li+li{margin-top:.55rem}.updated{font-size:.8rem;color:var(--muted)}footer{background:var(--nav);color:#dce7ee;padding:24px;text-align:center}
code{background:#eef2f4;border-radius:4px;padding:.1em .35em}.example{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
@media(max-width:900px){.shell{display:block}.sidebar{padding:14px 16px}.sidebar nav{position:static}.sidebar ul{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.sidebar li+li{margin:0}.sidebar .group{grid-column:1/-1;margin-top:.5rem}main{padding:34px 20px 56px}}
@media(max-width:600px){.site-header{height:56px;padding:0 16px}.sidebar ul,.cards{grid-template-columns:1fr}main{padding:28px 16px 48px}h1{font-size:2rem}.steps li{padding-left:52px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}