*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Noto Sans JP","Yu Gothic","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;color:#23364d;line-height:1.9;background:#fff}img{display:block;max-width:100%;height:auto}a{color:#1f3a5f;text-decoration:none}a:hover{text-decoration:underline}
:root{--navy:#1f3a5f;--navy2:#26466f;--orange:#f59e0b;--bg:#f5f7fb;--line:#d6deea;--text:#23364d;--muted:#5b6c82;--green:#0f8c5d;--radius:14px;--shadow:0 4px 18px rgba(31,58,95,.08)}
.container{max-width:1120px;margin:0 auto;padding:0 24px}.site-header{background:var(--navy);position:sticky;top:0;z-index:99;box-shadow:0 4px 18px rgba(0,0,0,.15)}.site-header .container{display:flex;justify-content:space-between;align-items:center;padding:14px 24px;gap:16px}.logo{color:#fff;font-weight:800;font-size:1.1rem}.header-link{display:inline-flex;align-items:center;justify-content:center;padding:10px 18px;border-radius:8px;background:#fff;color:var(--navy);font-weight:700}
.breadcrumb{background:#eef2f7;border-bottom:1px solid var(--line);font-size:.88rem}.breadcrumb .container{padding:10px 24px}.breadcrumb ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}.breadcrumb li:not(:last-child)::after{content:'›';margin-left:8px;color:#8da0b6}
.hero{padding:48px 0 36px;background:linear-gradient(180deg,#f7f9fc 0%,#ffffff 100%)}.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:28px;align-items:center}.eyebrow{display:inline-block;background:var(--orange);color:#fff;font-weight:800;padding:4px 10px;border-radius:999px;font-size:.8rem;margin-bottom:14px}.hero h1{margin:0 0 16px;font-size:clamp(30px,4vw,42px);line-height:1.35;color:var(--navy)}.lead{font-size:1.05rem;color:#44566e;margin-bottom:18px}.checklist{list-style:none;padding:0;margin:0 0 26px}.checklist li{display:flex;gap:10px;margin:8px 0;font-weight:600}.checklist li::before{content:'✓';color:var(--green);font-weight:900}.cta-box{border:2px solid #d7e2f0;background:#f8fbff;border-radius:18px;padding:24px;box-shadow:var(--shadow);margin:32px 0}.cta-box h3{margin:0 0 8px;font-size:1.25rem;color:var(--navy)}.cta-box p{margin:0 0 16px;color:#4d6078}.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 22px;border-radius:10px;background:var(--navy);color:#fff;font-weight:800;min-height:52px}.btn:hover{text-decoration:none;background:var(--navy2)}
.hero-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--shadow)}
section{padding:68px 0}.section-alt{background:var(--bg)}.section-title{font-size:clamp(24px,3vw,32px);line-height:1.4;color:var(--navy);margin:0 0 18px}.section-intro{color:#4e627a;margin:0 0 24px}.article{padding:24px 0}.article h2{font-size:clamp(24px,3vw,30px);margin:56px 0 16px;color:var(--navy);padding-bottom:10px;border-bottom:3px solid var(--orange)}.article h3{font-size:1.3rem;margin:28px 0 12px;color:var(--navy)}.article p{margin:0 0 16px}.article ul,.article ol{margin:0 0 18px 20px}.article li{margin:6px 0}.highlight{background:#fff7e8;border-left:4px solid var(--orange);padding:14px 16px;border-radius:8px;margin:18px 0}
.article-figure{margin:26px 0 34px}.article-figure img{width:100%;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}.article-figure figcaption{font-size:.92rem;color:#5f7188;margin-top:10px;text-align:center}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);margin:24px 0}table{width:100%;border-collapse:collapse;background:#fff}th,td{padding:14px 16px;border-bottom:1px solid var(--line);border-right:1px solid var(--line);vertical-align:top}th:last-child,td:last-child{border-right:none}th{background:var(--navy);color:#fff;text-align:left}tr:last-child td{border-bottom:none}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{border:1px solid var(--line);border-radius:16px;padding:20px;background:#fff;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:8px}.card h3{margin:0;font-size:1.08rem}.card p{margin:0;color:#5a6c83;font-size:.95rem}.toplink{margin-top:24px;padding:18px;border:2px solid var(--line);border-radius:14px;background:#fafcff;text-align:center}.toplink a{font-weight:800}.site-footer{background:var(--navy);color:#fff;padding:32px 0;margin-top:56px}.site-footer a{color:#fff}.muted{color:#66778d}.hidden-aio{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:22px}.note{font-size:.95rem;color:#607289}.center{text-align:center}
@media (max-width: 860px){.hero-grid,.two-col,.related-grid{grid-template-columns:1fr}.site-header .container{flex-wrap:wrap}.hero{padding-top:32px}section{padding:48px 0} .container{padding:0 16px}}