:root{--ink:#17212b;--muted:#667482;--line:#e5eaee;--blue:#2166d1;--soft:#f4f7fa;--card:#fff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;line-height:1.8;background:#fff}a{color:var(--blue);text-underline-offset:3px}a:focus-visible,button:focus-visible{outline:3px solid #8bbcff;outline-offset:3px}.wrap{max-width:1080px;margin:auto;padding:0 24px}.site-header{border-bottom:1px solid var(--line);background:#fff}.nav{height:72px;display:flex;align-items:center;justify-content:space-between}.brand{font-size:1.3rem;font-weight:800;letter-spacing:.08em;color:var(--ink);text-decoration:none}.navlinks{display:flex;gap:24px;align-items:center}.navlinks a{color:var(--ink);text-decoration:none;font-size:.95rem}.hero{padding:96px 0 88px;background:linear-gradient(135deg,#f7faff,#fff)}.eyebrow{color:var(--blue);font-weight:700;letter-spacing:.12em;font-size:.82rem}.hero h1{font-size:clamp(2.2rem,6vw,4.6rem);line-height:1.18;margin:16px 0}.lead{font-size:1.12rem;color:var(--muted);max-width:680px}.section{padding:72px 0}.section h2{font-size:2rem;line-height:1.3;margin:0 0 18px}.section-intro{color:var(--muted);max-width:700px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:30px}.card{border:1px solid var(--line);border-radius:18px;padding:26px;background:var(--card);box-shadow:0 8px 24px #17212b08}.card h3{margin:0 0 8px;line-height:1.4}.card p{color:var(--muted);margin:0 0 14px}.button{display:inline-block;background:var(--blue);color:#fff;text-decoration:none;border-radius:9px;padding:10px 17px;font-weight:700}.button.secondary{background:var(--soft);color:var(--ink)}.band{background:var(--soft)}.crumb{padding:24px 0 0;color:var(--muted);font-size:.9rem}.article{max-width:780px;padding:48px 0 88px}.article h1{font-size:clamp(2rem,5vw,3.2rem);line-height:1.3;margin:12px 0 28px}.article h2{font-size:1.45rem;margin-top:40px;border-bottom:1px solid var(--line);padding-bottom:8px}.article li{margin:8px 0}.notice{border-left:4px solid var(--blue);background:#f4f8ff;padding:16px 20px;margin:26px 0}.faq details{border-bottom:1px solid var(--line);padding:18px 0}.faq summary{font-weight:700;cursor:pointer}.footer{border-top:1px solid var(--line);padding:30px 0;color:var(--muted);font-size:.9rem}.footer a{color:inherit}.small{font-size:.9rem;color:var(--muted)}@media(max-width:720px){.nav{height:auto;padding:18px 0;align-items:flex-start;gap:15px}.navlinks{gap:11px;flex-wrap:wrap;justify-content:flex-end}.navlinks a{font-size:.82rem}.hero{padding:64px 0}.section{padding:52px 0}.grid{grid-template-columns:1fr}.wrap{padding:0 18px}}