:root{
  --ink:#16202e;--sub:#4a5668;--line:#dde3ea;--bg:#ffffff;--soft:#f3f6f9;
  --brand:#14365c;--accent:#1f7a8c;--accent-soft:#e6f2f4;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP",Meiryo,sans-serif;line-height:1.85;font-size:16px;-webkit-text-size-adjust:100%}
a{color:var(--accent)}
img{max-width:100%;height:auto}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
.narrow{max-width:760px}

/* header */
.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:60px;gap:12px}
.logo{font-weight:700;color:var(--brand);text-decoration:none;font-size:17px;white-space:nowrap}
.logo small{display:block;font-size:10px;letter-spacing:.12em;color:var(--sub);font-weight:400;line-height:1}
.gnav{display:flex;gap:20px;font-size:14px}
.gnav a{color:var(--ink);text-decoration:none}
.gnav a.btn-s{background:var(--brand);color:#fff;padding:7px 14px;border-radius:6px}
@media (max-width:720px){.gnav a:not(.btn-s){display:none}}

/* hero */
.hero{background:linear-gradient(135deg,#0f2a48 0%,#14365c 55%,#1f5f7a 100%);color:#fff;padding:84px 0 76px}
.hero .eyebrow{letter-spacing:.18em;font-size:12px;opacity:.8;margin:0 0 14px}
.hero h1{font-size:clamp(26px,4.6vw,42px);line-height:1.45;margin:0 0 20px}
.hero p.lead{font-size:clamp(15px,2vw,17px);max-width:640px;opacity:.92;margin:0 0 30px}
.btn{display:inline-block;background:#fff;color:var(--brand);font-weight:700;text-decoration:none;padding:14px 26px;border-radius:8px}
.btn.ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.6);margin-left:10px}
.btn.dark{background:var(--brand);color:#fff}
@media (max-width:480px){.btn.ghost{margin:10px 0 0}}

/* sections */
.block{padding:76px 0}
.block.soft{background:var(--soft)}
.label{color:var(--accent);font-size:12px;letter-spacing:.18em;font-weight:700;margin:0 0 6px}
h2{font-size:clamp(22px,3.2vw,30px);line-height:1.5;margin:0 0 18px}
.section-lead{color:var(--sub);max-width:720px;margin:0 0 36px}

.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px}
.card h3{font-size:18px;margin:0 0 8px;color:var(--brand)}
.card p{margin:0;color:var(--sub);font-size:15px}
.card .num{font-family:Georgia,serif;color:var(--accent);font-size:22px;margin:0 0 4px}

.checks{list-style:none;padding:0;margin:0;display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.checks li{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px 14px 44px;position:relative}
.checks li::before{content:"";position:absolute;left:16px;top:20px;width:14px;height:8px;border-left:3px solid var(--accent);border-bottom:3px solid var(--accent);transform:rotate(-45deg)}

.tags{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 0;padding:0;list-style:none}
.tags li{background:var(--accent-soft);color:var(--brand);font-size:13px;padding:4px 10px;border-radius:999px}

.flow{list-style:none;padding:0;margin:0;counter-reset:f;display:grid;gap:14px}
.flow li{counter-increment:f;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px 18px 72px;position:relative}
.flow li::before{content:"STEP " counter(f);position:absolute;left:18px;top:20px;font-size:11px;font-weight:700;color:var(--accent);letter-spacing:.05em;width:44px;line-height:1.3}
.flow strong{display:block;color:var(--brand)}
.flow span{color:var(--sub);font-size:15px}

table.cmp,table.company{width:100%;border-collapse:collapse;background:#fff;font-size:15px}
table.cmp th,table.cmp td,table.company th,table.company td{border:1px solid var(--line);padding:12px 14px;text-align:left;vertical-align:top}
table.cmp thead th{background:var(--brand);color:#fff}
table.cmp tbody th,table.company th{background:var(--soft);width:28%;white-space:nowrap}
.table-scroll{overflow-x:auto}
.table-scroll table{min-width:560px}

details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:0 18px;margin:0 0 10px}
summary{cursor:pointer;font-weight:700;padding:16px 0;list-style:none}
summary::-webkit-details-marker{display:none}
summary::before{content:"Q.";color:var(--accent);margin-right:8px}
details p{margin:0 0 16px;color:var(--sub)}

.col-list{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.col-card{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px;text-decoration:none;color:var(--ink);transition:border-color .2s}
.col-card:hover{border-color:var(--accent)}
.col-card .cat{font-size:12px;color:var(--accent);font-weight:700}
.col-card h3{font-size:17px;line-height:1.6;margin:6px 0 8px}
.col-card p{font-size:14px;color:var(--sub);margin:0}

.cta{background:var(--brand);color:#fff;text-align:center;padding:64px 0}
.cta h2{color:#fff}
.cta p{opacity:.9;margin:0 0 26px}
.cta .contact-line{margin-top:18px;font-size:14px;opacity:.85}
.cta .contact-line a{color:#fff}

/* article */
.breadcrumb{font-size:13px;color:var(--sub);padding:18px 0 0}
.breadcrumb a{color:var(--sub)}
.article-head{padding:24px 0 8px}
.article-head h1{font-size:clamp(23px,3.6vw,32px);line-height:1.5;margin:6px 0 12px}
.article-head .meta{font-size:13px;color:var(--sub)}
.article{padding:8px 0 64px}
.article h2{font-size:clamp(20px,2.8vw,24px);border-left:5px solid var(--accent);padding-left:12px;margin:48px 0 16px}
.article h3{font-size:18px;margin:32px 0 10px;color:var(--brand)}
.article p{margin:0 0 18px}
.article ul,.article ol{padding-left:1.4em;margin:0 0 18px}
.article li{margin:0 0 6px}
.summary-box{background:var(--accent-soft);border-radius:12px;padding:20px 22px;margin:20px 0 28px}
.summary-box p.ttl{font-weight:700;color:var(--brand);margin:0 0 8px}
.summary-box ul{margin:0}
.toc{border:1px solid var(--line);border-radius:12px;padding:18px 22px;margin:0 0 28px}
.toc p{font-weight:700;margin:0 0 6px}
.toc ol{margin:0}
.note{font-size:13px;color:var(--sub);border-top:1px solid var(--line);padding-top:16px;margin-top:40px}
.author{display:flex;gap:16px;align-items:flex-start;background:var(--soft);border-radius:12px;padding:20px;margin:32px 0}
.author .ic{flex:0 0 52px;height:52px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.author p{margin:0;font-size:14px;color:var(--sub)}
.author strong{color:var(--ink)}
.related{margin-top:40px}

.site-footer{background:#0e1d30;color:#c5cfdb;padding:40px 0;font-size:14px}
.site-footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px}
.site-footer a{color:#c5cfdb}
.site-footer ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:16px}

.notice{margin-top:24px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.35);border-radius:10px;padding:14px 18px;max-width:640px;font-size:14px}
.notice strong{display:block;font-size:15px;margin-bottom:2px}