:root{
  --ink:#111a2e; --navy:#0d1b4c; --paper:#fff; --paper-2:#f5f7fb;
  --muted:#5b6678; --line:#e6eaf2; --accent:#1f5bf5; --accent-soft:#eaf1ff;
  --serif:"Hiragino Mincho ProN","Yu Mincho",YuMincho,"Noto Serif JP",serif;
  --sans:"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP","Yu Gothic",YuGothic,Meiryo,system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.9;-webkit-font-smoothing:antialiased;font-feature-settings:"palt";letter-spacing:.01em}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.grain{position:fixed;inset:0;z-index:80;pointer-events:none;opacity:.035;mix-blend-mode:multiply;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");background-size:120px 120px}
header.site{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.9);backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid var(--line)}
.nav{max-width:1000px;margin:0 auto;padding:0 24px;height:66px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;flex-direction:column;line-height:1;gap:4px}
.brand .name{font-weight:800;font-size:19px;letter-spacing:.2em;color:var(--navy)}
.brand .sub{font-size:9px;font-weight:700;letter-spacing:.3em;color:var(--accent)}
.cta-mini{font-weight:700;font-size:13.5px;color:#fff;background:var(--accent);padding:11px 20px;border-radius:3px}
.cta-mini:hover{background:#1a4fe0;text-decoration:none}
.eyecatch{position:relative;overflow:hidden;background:linear-gradient(120deg,#0a1330 0%,#173aa0 72%,#0f2f9a 100%);color:#fff}
.eyecatch .ec-sky{position:absolute;left:0;right:0;bottom:0;z-index:0;opacity:.4;line-height:0}
.eyecatch .ec-sky svg{width:100%;height:auto;display:block}
.eyecatch::after{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;background:linear-gradient(90deg,rgba(6,11,30,.55) 0%,rgba(6,11,30,.2) 58%,rgba(6,11,30,0) 100%)}
.eyecatch .ec-brand{position:absolute;top:22px;left:50%;transform:translateX(-50%);z-index:3;font-size:10px;font-weight:700;letter-spacing:.34em;color:rgba(255,255,255,.65)}
.eyecatch .ec-in{position:relative;z-index:2;max-width:760px;margin:0 auto;padding:70px 24px 56px}
.cat{display:inline-flex;align-items:center;gap:10px;font-size:11px;font-weight:800;letter-spacing:.16em;color:var(--accent);text-transform:uppercase;margin:0 0 16px}
.cat::before{content:"";width:26px;height:1px;background:var(--accent)}
.eyecatch .cat{color:#b9d0ff}
.eyecatch .cat::before{background:#b9d0ff}
.cat a{color:inherit;text-decoration:none}
.cat a:hover{text-decoration:underline}
.eyecatch h1{color:#fff;margin:0 0 22px;font-size:clamp(28px,5.2vw,46px);line-height:1.5;letter-spacing:.04em;text-shadow:0 2px 26px rgba(0,8,36,.4);font-family:var(--serif);font-weight:600}
.eyecatch h1 .hl{color:#a9c7ff}
.eyecatch .a-meta{color:#c9d6f7;margin:0;display:flex;gap:16px;flex-wrap:wrap;font-size:12.5px}
main{max-width:760px;margin:0 auto;padding:0 24px 40px}
.crumbs{font-size:12px;color:var(--muted);padding:22px 0 0}
.crumbs a{color:var(--muted)}
.lead{font-size:16px;color:#2c374d;margin:28px 0 30px;line-height:2}
.toc{background:var(--paper-2);border:1px solid var(--line);border-radius:10px;padding:22px 24px;margin:0 0 40px}
.toc h2{font-size:13px;letter-spacing:.1em;color:var(--muted);margin:0 0 12px;text-transform:uppercase;font-weight:800;border:0;padding:0}
.toc ol{margin:0;padding-left:1.3em}
.toc li{font-size:14px;margin:7px 0;line-height:1.6}
article h2{position:relative;font-family:var(--serif);font-weight:600;font-size:clamp(22px,3.4vw,30px);line-height:1.55;color:var(--navy);margin:64px 0 22px;padding:14px 0 0 22px;border-top:1px solid var(--line)}
article h2::before{content:"";position:absolute;left:0;top:15px;bottom:0;width:5px;border-radius:3px;background:linear-gradient(180deg,var(--accent) 0%,#6f97ff 100%)}
article h3{position:relative;font-size:18px;font-weight:800;color:var(--ink);margin:36px 0 12px;padding-left:17px}
article h3::before{content:"";position:absolute;left:0;top:.5em;width:9px;height:9px;border-radius:50%;background:var(--accent)}
article p{margin:0 0 20px;font-size:15.5px}
article ul,article ol{margin:0 0 22px;padding-left:1.4em}
article li{margin:9px 0;font-size:15.5px;line-height:1.9}
article strong{color:var(--navy)}
.tablewrap{overflow-x:auto;margin:0 0 26px;border:1px solid var(--line);border-radius:10px}
table{width:100%;border-collapse:collapse;min-width:460px;font-size:14.5px}
th,td{padding:13px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:var(--accent-soft);color:var(--navy);font-weight:800;font-size:13px}
tr:last-child td{border-bottom:0}
td.em{font-weight:800;color:var(--navy);font-variant-numeric:tabular-nums;white-space:nowrap}
.callout{background:var(--accent-soft);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:8px;padding:18px 22px;margin:0 0 26px}
.callout p{margin:0;font-size:14.5px}
.callout .t{font-weight:800;color:var(--navy);display:block;margin-bottom:6px;font-size:14px}
.check{list-style:none;padding:0;margin:0 0 26px}
.check li{position:relative;padding-left:34px;margin:12px 0;font-weight:600}
.check li::before{content:"";position:absolute;left:0;top:2px;width:22px;height:22px;border-radius:50%;background:var(--accent-soft)}
.check li::after{content:"";position:absolute;left:7px;top:8px;width:9px;height:5px;border-left:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(-45deg)}
ol.flow{list-style:none;padding:0;margin:0 0 26px;counter-reset:st}
ol.flow li{position:relative;padding:16px 20px 16px 66px;border:1px solid var(--line);border-radius:10px;margin:10px 0;background:#fff}
ol.flow li::before{counter-increment:st;content:counter(st);position:absolute;left:16px;top:14px;width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;font-weight:800;display:grid;place-items:center;font-size:16px}
ol.flow li b{display:block;color:var(--navy);margin-bottom:3px;font-size:15.5px}
ol.flow li span{font-size:14px;color:#3a465c;line-height:1.8}
details.faq{border:1px solid var(--line);border-radius:8px;margin:0 0 12px;overflow:hidden}
details.faq summary{cursor:pointer;padding:16px 20px;font-weight:800;font-size:15px;color:var(--navy);list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"＋";color:var(--accent);font-weight:700}
details.faq[open] summary::after{content:"−"}
details.faq .a{padding:0 20px 18px;font-size:14.5px;color:#2c374d}
details.faq .a p{margin:0}
.cta-mid{margin:34px 0;background:var(--accent-soft);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:10px;padding:20px 24px;display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.cta-mid .t{font-weight:800;color:var(--navy);font-size:15.5px;flex:1;min-width:220px;line-height:1.7}
.cta-mid a{white-space:nowrap;background:var(--accent);color:#fff;font-weight:800;font-size:14px;padding:13px 22px;border-radius:4px}
.cta-mid a:hover{background:#1a4fe0;text-decoration:none}
.cta{margin:56px 0 20px;background:linear-gradient(135deg,#0d1b4c,#1f5bf5);color:#fff;border-radius:14px;padding:38px 34px;text-align:center}
.cta h2{font-family:var(--serif);font-weight:600;font-size:24px;margin:0 0 10px;color:#fff;border:0;padding:0}
.cta p{margin:0 0 22px;font-size:14.5px;color:#dde6ff}
.cta > a{display:inline-flex;align-items:center;gap:10px;background:#fff;color:var(--navy);font-weight:800;font-size:15px;padding:15px 30px;border-radius:4px}
.cta > a:hover{text-decoration:none;transform:translateY(-2px);transition:.2s}
.trust-line{display:flex;gap:20px;flex-wrap:wrap;justify-content:center;margin:14px 0 0;font-size:12.5px;color:#dde6ff}
.trust-line span{display:inline-flex;align-items:center;gap:6px}
.related{margin:44px 0 0;border-top:1px solid var(--line);padding-top:28px}
.related h2{font-size:16px;font-weight:800;color:var(--navy);margin:0 0 16px;border:0;padding:0;font-family:var(--sans)}
.related ul{list-style:none;padding:0;margin:0;display:grid;gap:2px}
.related a{display:flex;gap:12px;align-items:baseline;padding:12px 14px;border:1px solid var(--line);border-radius:8px;color:var(--ink);font-weight:700;font-size:14px}
.related a:hover{text-decoration:none;border-color:var(--accent);background:var(--accent-soft)}
.related .soon{color:var(--muted);font-size:11px;font-weight:700;margin-left:auto;white-space:nowrap}
.owner{margin:44px 0 0;border:1px solid var(--line);border-radius:12px;padding:24px 26px;background:var(--paper-2)}
.owner h3{margin:0 0 10px;font-size:14px;color:var(--muted);font-weight:800;letter-spacing:.08em;text-transform:uppercase}
.owner .nm{font-weight:800;color:var(--navy);font-size:16px;letter-spacing:.1em;margin:0 0 8px}
.owner p{margin:0 0 6px;font-size:13.5px;color:#3a465c;line-height:1.85}
.disc{font-size:11.5px;color:var(--muted);margin:30px 0 0;line-height:1.8;border-top:1px solid var(--line);padding-top:18px}
.float-cta{position:fixed;left:0;right:0;bottom:0;z-index:70;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-top:1px solid var(--line);padding:12px 16px;display:none;justify-content:center}
.float-cta a{background:var(--accent);color:#fff;font-weight:800;font-size:15px;padding:14px 26px;border-radius:6px;width:100%;max-width:420px;text-align:center}
.float-cta a:hover{text-decoration:none}
footer.site{background:var(--navy);color:#9fb0d6;padding:40px 0;font-size:12.5px;margin-top:56px}
footer.site .in{max-width:1000px;margin:0 auto;padding:0 24px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;align-items:center}
footer.site .name{color:#fff;font-weight:800;letter-spacing:.18em}
@media(max-width:760px){.float-cta{display:flex}main{padding-bottom:88px}}

.lede-accent{color:var(--accent);font-weight:800}
/* enhance: related cards + share */

.related .rcards{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:6px 0 0}
.related .rcards .rcard{display:grid;grid-template-columns:104px 1fr;align-items:stretch;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff;padding:0;transition:.16s}
.related .rcards .rcard:hover{border-color:var(--accent);background:#fff;box-shadow:0 6px 18px rgba(15,30,80,.09);transform:translateY(-1px);text-decoration:none}
.related .rcards .rc-img{display:block;width:104px;height:100%;min-height:70px;background:linear-gradient(120deg,#0a1330,#173aa0);overflow:hidden}
.related .rcards .rc-img img{width:100%;height:100%;object-fit:cover;display:block}
.related .rcards .rc-b{display:flex;flex-direction:column;justify-content:center;padding:10px 13px}
.related .rcards .rc-t{display:block;font-size:13px;font-weight:800;color:var(--navy);line-height:1.5;margin:0}
.related .rcards .rc-more{display:inline-block;margin-top:6px;font-size:11px;font-weight:800;letter-spacing:.03em;color:var(--accent)}
@media(max-width:560px){.related .rcards{grid-template-columns:1fr}}
.share{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:44px 0 0;padding-top:22px;border-top:1px solid var(--line)}
.share .lb{font-size:12px;font-weight:800;letter-spacing:.06em;color:var(--muted);margin-right:2px}
.share a{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:800;color:var(--navy);border:1px solid var(--line);border-radius:6px;padding:6px 11px;line-height:1}
.share a:hover{border-color:var(--accent);background:var(--accent-soft);text-decoration:none;color:var(--navy)}
.share a .ic{width:13px;height:13px;flex:0 0 13px;display:inline-block;vertical-align:middle;fill:currentColor}