:root{--ink:#142036;--muted:#647086;--line:#dfe5ed;--paper:#fff;--bg:#f5f7fa;--navy:#0c1d37;--blue:#2469df;--accent:#f56528;--soft:#fff4ed}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Yu Gothic",Meiryo,sans-serif;line-height:1.82}a{color:inherit}.wrap{width:min(1120px,calc(100% - 40px));margin:auto}.topbar{position:sticky;top:0;z-index:20;background:#ffffffee;border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.topbar .wrap{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{text-decoration:none;font-size:.95rem;font-weight:900;letter-spacing:.04em}.brand small{display:block;color:var(--muted);font-size:.59rem;letter-spacing:.15em}.nav{display:flex;align-items:center;gap:20px;font-size:.82rem;font-weight:700}.nav a{text-decoration:none}.nav .contact{padding:10px 17px;border-radius:99px;background:var(--accent);color:#fff}.hero{position:relative;overflow:hidden;padding:100px 0 88px;background:radial-gradient(circle at 80% 25%,var(--glow,#f9986550),transparent 33%),linear-gradient(135deg,#09172d,#173d6c);color:#fff}.hero:after{content:"";position:absolute;width:360px;height:360px;border:1px solid #ffffff22;border-radius:50%;right:-80px;bottom:-190px}.kicker{color:#ffb58f;font-size:.76rem;font-weight:900;letter-spacing:.14em}.hero h1{max-width:950px;margin:.3em 0;font-size:clamp(2.25rem,5.7vw,4.8rem);line-height:1.14;letter-spacing:-.045em}.hero .lead{max-width:790px;color:#dce7f7;font-size:1.05rem}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.btn{display:inline-flex;min-height:52px;align-items:center;justify-content:center;padding:0 22px;border-radius:99px;background:var(--accent);color:#fff;text-decoration:none;font-weight:900}.btn.sub{background:#fff;color:var(--navy)}.proof{background:#fff;border-bottom:1px solid var(--line)}.proof .wrap{display:grid;grid-template-columns:repeat(4,1fr)}.proof div{padding:24px 18px;border-right:1px solid var(--line)}.proof div:first-child{border-left:1px solid var(--line)}.proof b{display:block;font-size:.95rem}.proof span{font-size:.76rem;color:var(--muted)}main>section.content{padding:72px 0}.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:42px}.article{min-width:0}.chapter{padding:34px 0;border-bottom:1px solid var(--line)}.chapter:first-child{padding-top:0}.chapter h2{font-size:clamp(1.65rem,3vw,2.45rem);line-height:1.35;margin:0 0 20px}.chapter h2:before{content:"";display:block;width:46px;height:4px;margin-bottom:15px;border-radius:9px;background:var(--accent)}.chapter h3{font-size:1.15rem;margin:28px 0 8px}.chapter p{margin:0 0 14px}.chapter ul{margin:18px 0;padding:22px 24px 22px 45px;background:#fff;border:1px solid var(--line);border-radius:15px}.chapter li+li{margin-top:7px}.closing{margin:52px 0 0;padding:38px;border-radius:20px;background:linear-gradient(145deg,#fff,#edf4ff);border:1px solid #d9e6fb}.closing h2{margin:0 0 16px;font-size:clamp(1.7rem,3.4vw,2.8rem);line-height:1.3}.side{position:sticky;top:94px;align-self:start}.side-card{padding:23px;border:1px solid var(--line);border-radius:17px;background:#fff;box-shadow:0 12px 30px #1727400b}.side-card strong{display:block;font-size:1.05rem}.side-card p{color:var(--muted);font-size:.85rem}.side-card .btn{width:100%;font-size:.87rem}.toc{margin-top:16px;padding:20px;border:1px solid var(--line);border-radius:17px;background:#fff}.toc b{font-size:.74rem;letter-spacing:.1em;color:var(--muted)}.toc a{display:block;padding:7px 0;border-bottom:1px solid #edf0f4;text-decoration:none;font-size:.78rem;color:#48566c}.cta{padding:66px 0;background:linear-gradient(135deg,#ef5d22,#d84425);color:#fff}.cta .wrap{display:flex;justify-content:space-between;align-items:center;gap:36px}.cta h2{margin:0;font-size:clamp(1.8rem,4vw,3rem);line-height:1.25}.cta p{max-width:720px;margin:12px 0 0;color:#fff0e8}.cta .btn{background:#fff;color:#b7351c;white-space:nowrap}footer{padding:38px 0;background:#fff;color:var(--muted);font-size:.8rem}.breadcrumbs{margin-bottom:12px;font-size:.75rem;color:#aab8cc}@media(max-width:900px){.content-grid{grid-template-columns:1fr}.side{position:static;display:grid;grid-template-columns:1fr 1fr;gap:15px}.proof .wrap{grid-template-columns:1fr 1fr}.proof div:nth-child(3){border-left:1px solid var(--line)}.cta .wrap{display:block}.cta .actions{margin-top:24px}}@media(max-width:620px){.wrap{width:min(100% - 28px,1120px)}.nav>a:not(.contact){display:none}.hero{padding:68px 0 58px}.hero h1{font-size:2.35rem}.proof .wrap,.side{grid-template-columns:1fr}.proof div{border-left:1px solid var(--line)}main>section.content{padding:50px 0}.chapter{padding:28px 0}.closing{padding:26px}.cta{padding:50px 0}}