*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#111;
  --muted:#5f6368;
  --paper:#fff;
  --warm:#fafaf5;
  --line:#ddd;
  --gold:#d48b22;
  --max:1120px;
  --radius:10px;
}
html{scroll-behavior:smooth}
body{
  color:var(--ink);
  background:var(--paper);
  font-family:"Yu Gothic","Hiragino Kaku Gothic ProN","BIZ UDPGothic",Meiryo,sans-serif;
  line-height:1.85;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
.container{width:min(var(--max),calc(100% - 40px));margin-inline:auto}
.skip-link{position:absolute;left:-9999px;top:8px;background:#fff;padding:10px 16px;z-index:2000}
.skip-link:focus{left:8px}
.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
.header-inner{height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:10px;min-width:max-content}
.brand img{width:48px;height:48px;object-fit:contain}
.brand strong{display:block;font-size:1rem;line-height:1.25}
.brand small{display:block;color:var(--muted);font-size:.65rem}
.nav{display:flex;align-items:center;gap:24px;font-size:.84rem;font-weight:700}
.nav a:hover{text-decoration:underline;text-underline-offset:5px}
.nav-cta,.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--ink);color:#fff;border-radius:5px;padding:13px 24px;font-weight:700;line-height:1.4}
.btn-secondary{background:#fff;color:var(--ink);border:1px solid var(--line)}
.menu-button{display:none;border:0;background:transparent;padding:10px;font:inherit;font-weight:700}
.mobile-nav{display:none;padding:8px 0 18px;border-top:1px solid var(--line)}
.mobile-nav a{display:block;padding:11px 0;border-bottom:1px solid #eee;font-weight:700}
.breadcrumb{padding:18px 0;color:var(--muted);font-size:.78rem}
.breadcrumb ol{display:flex;gap:8px;flex-wrap:wrap;list-style:none}
.breadcrumb li:not(:last-child)::after{content:"/";margin-left:8px;color:#aaa}
.page-hero{background:var(--warm);border-block:1px solid #eee;padding:72px 0}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(300px,.8fr);gap:64px;align-items:center}
.eyebrow{display:inline-block;color:#7a530f;font-size:.75rem;font-weight:900;letter-spacing:.15em;text-transform:uppercase;margin-bottom:14px}
h1{font-size:clamp(2rem,5vw,3.7rem);line-height:1.25;letter-spacing:-.03em;margin-bottom:22px}
.hero-lead{font-size:1.03rem;color:#41464b;max-width:680px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.hero-visual{position:relative}
.hero-visual img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--radius);box-shadow:0 18px 45px rgba(0,0,0,.14)}
.fact-card{position:absolute;left:-24px;bottom:-24px;background:#111;color:#fff;padding:20px 22px;border-radius:8px;min-width:210px;box-shadow:0 10px 25px rgba(0,0,0,.2)}
.fact-card strong{display:block;font-size:1.35rem}
.fact-card span{font-size:.78rem;color:rgba(255,255,255,.7)}
.section{padding:84px 0}
.section-warm{background:var(--warm)}
.section-head{max-width:720px;margin-bottom:38px}
.section-label{color:#7a530f;font-size:.74rem;font-weight:900;letter-spacing:.14em;text-transform:uppercase;margin-bottom:8px}
h2{font-size:clamp(1.6rem,3.5vw,2.35rem);line-height:1.4;margin-bottom:14px}
h3{font-size:1.08rem;line-height:1.5;margin-bottom:8px}
.section-head p,.prose p{color:var(--muted)}
.prose{max-width:780px}
.prose p+p{margin-top:18px}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.card-num{display:block;color:var(--gold);font-weight:900;font-size:.78rem;margin-bottom:10px}
.card p{color:var(--muted);font-size:.9rem}
.check-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;list-style:none}
.check-list li{position:relative;background:#fff;border:1px solid var(--line);border-radius:8px;padding:18px 18px 18px 48px}
.check-list li::before{content:"✓";position:absolute;left:18px;top:17px;color:#7a530f;font-weight:900}
.process{counter-reset:step;display:grid;gap:0;max-width:840px}
.process li{counter-increment:step;list-style:none;display:grid;grid-template-columns:68px 1fr;gap:18px;padding:24px 0;border-bottom:1px solid var(--line)}
.process li::before{content:counter(step,decimal-leading-zero);font-size:1.7rem;font-weight:900;color:var(--gold)}
.process p{color:var(--muted);font-size:.92rem}
.case-figure{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(280px,.8fr);gap:40px;align-items:start}
.case-figure img{width:100%;border-radius:var(--radius);box-shadow:0 14px 34px rgba(0,0,0,.12)}
.case-data{border-top:3px solid var(--ink)}
.case-data div{display:grid;grid-template-columns:110px 1fr;gap:12px;padding:14px 0;border-bottom:1px solid var(--line)}
.case-data dt{font-weight:700}
.case-data dd{color:var(--muted)}
.faq{max-width:860px}
.faq details{border-top:1px solid var(--line)}
.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;font-weight:700;padding:22px 42px 22px 0;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"＋";position:absolute;right:6px;top:20px;font-size:1.2rem}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 42px 22px 0;color:var(--muted)}
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.related a{border:1px solid var(--line);border-radius:8px;padding:22px;background:#fff;transition:transform .2s,box-shadow .2s}
.related a:hover{transform:translateY(-3px);box-shadow:0 8px 22px rgba(0,0,0,.08)}
.cta-section{background:#111;color:#fff;padding:68px 0}
.cta-inner{display:flex;justify-content:space-between;align-items:center;gap:32px}
.cta-section p{color:rgba(255,255,255,.72);margin-top:8px}
.cta-section .btn{background:#fff;color:#111}
.site-footer{background:#080808;color:rgba(255,255,255,.7);padding:38px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px}
.site-footer h2{font-size:.9rem;color:#fff;margin-bottom:10px}
.site-footer p,.site-footer li{font-size:.8rem;list-style:none}
.site-footer a:hover{color:#fff}
.copyright{margin-top:26px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);font-size:.72rem;text-align:center}
@media(max-width:880px){
  .nav{display:none}
  .menu-button{display:block}
  .mobile-nav.open{display:block}
  .hero-grid,.case-figure{grid-template-columns:1fr}
  .hero-visual{max-width:620px}
  .fact-card{left:14px}
  .cards,.related{grid-template-columns:1fr 1fr}
}
@media(max-width:620px){
  .container{width:min(var(--max),calc(100% - 28px))}
  .page-hero{padding:52px 0 66px}
  .hero-grid{gap:36px}
  .hero-actions{flex-direction:column}
  .btn{width:100%}
  .fact-card{position:static;margin-top:12px}
  .section{padding:62px 0}
  .cards,.related,.check-list{grid-template-columns:1fr}
  .cta-inner{flex-direction:column;align-items:flex-start}
  .footer-grid{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important}
}