:root{--navy:#071522;--navy2:#0a1a28;--paper:#f4f7f9;--white:#fff;--ink:#10263a;--muted:#5e7484;--line:#cbd7de;--accent:#7fc7ee;--gold:#9d895e}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Yu Gothic",Meiryo,sans-serif;line-height:1.8;letter-spacing:.02em}
a{color:inherit;text-decoration:none}
.wrap{width:min(1120px,calc(100% - 64px));margin:auto}
.header{position:sticky;top:0;z-index:30;height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 32px;background:rgba(7,21,34,.96);color:#fff;border-bottom:1px solid rgba(255,255,255,.1);backdrop-filter:blur(10px)}
.brand{display:flex;align-items:center;gap:13px;font-family:Georgia,"Yu Mincho","Hiragino Mincho ProN",serif;font-size:16px;letter-spacing:.07em}
.brand-mark{display:none}
.nav{display:flex;align-items:center;gap:24px;font-size:12px;color:#c8d6df}
.nav a:hover{color:#fff}
.contact-link{padding:9px 15px;border:1px solid rgba(255,255,255,.35);color:#fff}
.hero{background:radial-gradient(circle at 86% 18%,rgba(127,199,238,.15),transparent 27%),linear-gradient(135deg,var(--navy),var(--navy2));color:#fff;padding:96px 0 90px;position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:54px 54px;mask-image:linear-gradient(to right,transparent,black)}
.hero .wrap{position:relative;z-index:1}
.crumb{font-size:11px;color:#9fb2c0;margin-bottom:44px}.crumb a{text-decoration:underline;text-underline-offset:3px}
.eyebrow,.section-label{font-size:10px;letter-spacing:.26em;text-transform:uppercase;font-weight:800;color:#6f8ca1}
.hero .eyebrow{color:var(--accent)}
h1,h2,h3{font-family:Georgia,"Yu Mincho","Hiragino Mincho ProN",serif;font-weight:500}
h1{font-size:clamp(40px,6vw,72px);line-height:1.25;letter-spacing:-.02em;margin:16px 0 24px;max-width:900px}
.hero-lead{max-width:760px;color:#b9cad6;font-size:17px;margin:0}
.intro{padding:92px 0;background:#fff}
.intro-grid{display:grid;grid-template-columns:.36fr 1fr;gap:72px}
.intro h2,.section-head h2{font-size:clamp(34px,4.5vw,56px);line-height:1.35;margin:0 0 25px}
.intro p{font-size:16px;margin:0 0 18px;color:#314b60}
.content-section{padding:92px 0}
.content-section.alt{background:#e8eef2}
.section-head{display:grid;grid-template-columns:.36fr 1fr;gap:72px;margin-bottom:42px}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.card{background:#fff;padding:34px;min-height:210px}
.card .n{font-family:Georgia,serif;color:var(--gold);font-size:13px}
.card h3{font-size:23px;line-height:1.45;margin:14px 0 12px;color:#173d5c}
.card p{margin:0;color:#526979;font-size:14px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.step{padding:34px;border-right:1px solid var(--line)}
.step:last-child{border-right:0}
.step b{display:block;font-family:Georgia,serif;color:var(--gold);font-size:13px;margin-bottom:13px}
.step h3{font-size:22px;margin:0 0 12px}
.step p{font-size:14px;color:#526979;margin:0}
.note{margin-top:30px;padding:23px 26px;border-left:3px solid #7e9bb0;background:#fff;color:#526979;font-size:14px}
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:24px 4px}
.faq summary{cursor:pointer;font-family:Georgia,"Yu Mincho",serif;font-size:19px;color:#173d5c;list-style:none;padding-right:30px;position:relative}
.faq summary:after{content:"＋";position:absolute;right:3px;color:#6f8ca1}
.faq details[open] summary:after{content:"−"}
.faq p{margin:15px 0 0;color:#526979;font-size:14px}
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.related a{background:#fff;border:1px solid var(--line);padding:22px;min-height:112px;display:flex;align-items:center;justify-content:space-between;font-family:Georgia,"Yu Mincho",serif;color:#173d5c}
.related a:hover{border-color:#7896aa}
.cta{background:var(--navy);color:#fff;padding:82px 0}
.cta-grid{display:grid;grid-template-columns:1fr auto;gap:50px;align-items:end}
.cta h2{font-size:clamp(34px,4.5vw,54px);line-height:1.35;margin:10px 0 16px}
.cta p{color:#98adbc;margin:0}
.cta-actions{display:flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-flex;justify-content:space-between;gap:24px;align-items:center;min-width:220px;padding:15px 18px;border:1px solid rgba(255,255,255,.35);font-size:13px}
.btn.primary{background:#fff;color:var(--navy)}
.footer{background:#04101a;color:#7f95a5;padding:30px 32px;display:flex;justify-content:space-between;gap:20px;font-size:11px;letter-spacing:.08em}
.mobilebar{display:none}
@media(max-width:860px){.nav{display:none}.intro-grid,.section-head,.cta-grid{grid-template-columns:1fr;gap:26px}.cards{grid-template-columns:1fr}.steps{grid-template-columns:1fr}.step{border-right:0;border-bottom:1px solid var(--line)}.step:last-child{border-bottom:0}.related{grid-template-columns:1fr}.hero{padding:72px 0}.intro,.content-section{padding:72px 0}}
@media(max-width:620px){.wrap{width:calc(100% - 36px)}.header{height:66px;padding:0 18px}.brand{font-size:14px}.contact-link{display:none}h1{font-size:38px}.hero-lead{font-size:15px}.intro h2,.section-head h2{font-size:34px}.card{padding:27px}.cta{padding:66px 0 90px}.cta-actions{width:100%}.btn{width:100%}.footer{padding:28px 18px 76px;display:block}.footer span{display:block;margin-bottom:9px}.mobilebar{display:grid;grid-template-columns:1fr 1fr;position:fixed;left:0;right:0;bottom:0;z-index:50;background:#fff;box-shadow:0 -7px 22px rgba(0,0,0,.14)}.mobilebar a{padding:14px 8px;text-align:center;font-size:13px;color:var(--navy)}.mobilebar a:last-child{background:var(--navy);color:#fff}}