:root{
  --navy:#12324f;
  --navy-deep:#0b2842;
  --orange:#f47f20;
  --orange-light:#ff982f;
  --ink:#243447;
  --muted:#647586;
  --line:#e3e9ee;
  --soft:#f6f8fa;
  --cream:#fff8f1;
  --white:#fff;
  --max:1120px;
  --article:760px;
  --shadow:0 16px 44px rgba(18,50,79,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--ink);
  background:var(--white);
  font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic","Noto Sans JP",sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
:focus-visible{outline:3px solid rgba(244,127,32,.4);outline-offset:3px}
.container{width:min(calc(100% - 48px),var(--max));margin:auto}
.site-header{
  position:sticky;
  top:0;
  z-index:30;
  border-bottom:1px solid rgba(227,233,238,.9);
  background:rgba(255,255,255,.96);
  backdrop-filter:blur(12px);
}
.site-header .container{width:min(calc(100% - 48px),1264px)}
.header-inner{min-height:74px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;line-height:0}
.brand img{width:210px;height:auto}
.header-nav{display:flex;align-items:center;gap:26px;margin-left:auto;color:var(--navy);font-size:13px;font-weight:700}
.header-nav a{position:relative}
.header-nav a::after{content:"";position:absolute;left:0;right:100%;bottom:-5px;height:2px;background:var(--orange);transition:right .18s ease}
.header-nav a:hover::after{right:0}
.header-cta{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:0 26px;border-radius:999px;background:var(--orange);color:#fff!important;font-size:14px;font-weight:800}
.header-cta::after{display:none}
.breadcrumb{padding:21px 0;color:#7b8895;font-size:12px}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:#aeb8c0}
.breadcrumb a{text-decoration:underline;text-decoration-color:#ccd3d9;text-underline-offset:3px}
.article-hero{padding:76px 0 82px;background:linear-gradient(145deg,var(--navy-deep),var(--navy));color:#fff}
.article-hero-inner{max-width:900px}
.eyebrow{display:flex;align-items:center;gap:10px;color:#ffb06a;font-size:12px;font-weight:900;letter-spacing:.13em}
.eyebrow::before{content:"";width:24px;height:2px;background:var(--orange)}
.article-hero h1{max-width:850px;margin:24px 0 0;font-size:clamp(38px,5.5vw,62px);line-height:1.35;letter-spacing:-.035em}
.article-lead{max-width:790px;margin:25px 0 0;color:#dce6ee;font-size:18px;line-height:2}
.article-meta{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:28px;color:#b8c8d5;font-size:12px}
.article-layout{display:grid;grid-template-columns:minmax(0,var(--article)) 260px;align-items:start;justify-content:space-between;gap:70px;padding:78px 0 104px}
.article-body{min-width:0}
.article-body>p{margin:0 0 25px;font-size:16px;line-height:2.05}
.article-body h2{margin:68px 0 22px;padding-left:18px;border-left:4px solid var(--orange);color:var(--navy);font-size:30px;line-height:1.55;letter-spacing:-.02em}
.article-body h2:first-of-type{margin-top:0}
.article-body h3{margin:38px 0 14px;color:var(--navy);font-size:21px;line-height:1.6}
.article-body ul,.article-body ol{margin:18px 0 27px;padding-left:1.4em}
.article-body li{margin:10px 0;font-size:15px;line-height:1.9}
.article-body strong{color:var(--navy)}
.summary-box{margin-bottom:44px;padding:27px 30px;border:1px solid #ead9c9;background:var(--cream)}
.summary-box strong{display:block;margin-bottom:10px;color:#8d552b;font-size:13px;letter-spacing:.04em}
.summary-box p{margin:0;color:#665b52;font-size:15px;line-height:1.9}
.definition-box{margin:28px 0 34px;padding:30px;border-left:4px solid var(--navy);background:var(--soft)}
.definition-box p{margin:0;color:#4f6273;font-size:15px;line-height:2}
.comparison{width:100%;margin:25px 0 34px;border-collapse:collapse;font-size:14px}
.comparison th,.comparison td{padding:15px 16px;border:1px solid var(--line);text-align:left;vertical-align:top;line-height:1.7}
.comparison th{background:var(--navy);color:#fff;font-weight:800}
.comparison td:first-child{width:25%;background:#f7f9fb;color:var(--navy);font-weight:800}
.check-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:13px;margin:24px 0 34px}
.check-item{position:relative;padding:18px 18px 18px 44px;border:1px solid var(--line);background:#fff;font-size:14px;font-weight:700;line-height:1.65}
.check-item::before{content:"✓";position:absolute;left:18px;top:18px;color:var(--orange);font-weight:900}
.note{margin:28px 0;padding:20px 23px;border:1px solid #dfe6ec;background:#f8fafb;color:#5d6d7c;font-size:13px;line-height:1.9}
.article-cta{margin-top:72px;padding:40px 38px;background:linear-gradient(145deg,var(--navy-deep),var(--navy));color:#fff;text-align:center}
.article-cta small{display:block;color:#ffb06a;font-weight:900;letter-spacing:.12em}
.article-cta h2{margin:12px 0 0;padding:0;border:0;color:#fff;font-size:29px}
.article-cta p{max-width:590px;margin:16px auto 0;color:#dce6ee;font-size:14px;line-height:1.9}
.button{display:inline-flex;align-items:center;justify-content:center;min-width:300px;min-height:58px;margin-top:25px;padding:0 28px;border-radius:999px;background:linear-gradient(90deg,var(--orange-light),var(--orange));color:#fff;font-size:15px;font-weight:900;box-shadow:0 10px 24px rgba(244,127,32,.22);transition:transform .18s ease,opacity .18s ease}
.button:hover{transform:translateY(-1px);opacity:.95}
.toc{position:sticky;top:106px;padding:25px 24px;border-top:3px solid var(--orange);background:var(--soft)}
.toc-title{color:var(--navy);font-size:13px;font-weight:900;letter-spacing:.08em}
.toc ol{margin:15px 0 0;padding:0;list-style:none;counter-reset:toc}
.toc li{counter-increment:toc;margin:10px 0}
.toc a{display:grid;grid-template-columns:24px 1fr;gap:5px;color:#617181;font-size:12px;line-height:1.65}
.toc a::before{content:counter(toc,decimal-leading-zero);color:#b06a33;font-size:10px;font-weight:900;padding-top:2px}
.toc a:hover{color:var(--navy)}
.related{padding:82px 0;background:var(--soft)}
.section-kicker{color:var(--orange);font-size:12px;font-weight:900;letter-spacing:.13em}
.related h2,.guide-list h2{margin:11px 0 0;color:var(--navy);font-size:35px;line-height:1.45}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:30px}
.related-card{display:flex;min-height:176px;flex-direction:column;padding:25px;border:1px solid var(--line);background:#fff;transition:transform .18s ease,box-shadow .18s ease}
.related-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.related-card small{color:#a05d2e;font-size:10px;font-weight:900;letter-spacing:.09em}
.related-card strong{margin-top:12px;color:var(--navy);font-size:18px;line-height:1.55}
.related-card span{margin-top:auto;padding-top:20px;color:var(--orange);font-size:12px;font-weight:800}
.related-index-link-wrap{margin-top:30px;text-align:center}
.related-index-link{display:inline-flex;min-height:48px;align-items:center;justify-content:center;padding:0 24px;border:1px solid #cfd9e1;border-radius:999px;background:#fff;color:var(--navy);font-size:13px;font-weight:900;transition:border-color .18s ease,transform .18s ease}
.related-index-link:hover{transform:translateY(-1px);border-color:var(--navy)}
.guide-hero{padding:90px 0 82px;background:linear-gradient(145deg,#fff 0%,#f6f8fa 68%,#fff4e9 100%)}
.guide-hero h1{max-width:800px;margin:23px 0 0;color:var(--navy);font-size:clamp(40px,5.5vw,62px);line-height:1.35;letter-spacing:-.035em}
.guide-hero p{max-width:760px;margin:24px 0 0;color:var(--muted);font-size:17px;line-height:2}
.guide-list{padding:86px 0 105px}
.guide-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:36px}
.guide-card{display:flex;min-height:230px;flex-direction:column;padding:32px;border:1px solid var(--line);background:#fff;box-shadow:0 10px 28px rgba(18,50,79,.04)}
.guide-card-number{color:var(--orange);font-size:11px;font-weight:900;letter-spacing:.12em}
.guide-card h2{margin:14px 0 0;font-size:23px;line-height:1.55}
.guide-card p{margin:14px 0 0;color:var(--muted);font-size:14px;line-height:1.85}
.guide-card span{margin-top:auto;padding-top:24px;color:var(--navy);font-size:12px;font-weight:900}
.guide-card--soon{background:var(--soft);box-shadow:none;opacity:.72}
.site-footer{padding:34px 0;border-top:1px solid var(--line);background:#fff;color:#778693;font-size:12px}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:24px}
.footer-links{display:flex;flex-wrap:wrap;gap:18px}
.footer-links a{text-decoration:underline;text-decoration-color:#ccd4da;text-underline-offset:4px}
@media(max-width:980px){
  .header-nav a:not(.header-cta){display:none}
}
@media(max-width:900px){
  .container{width:min(calc(100% - 34px),var(--max))}
  .site-header .container{width:min(calc(100% - 48px),1264px)}
  .brand img{width:170px}
  .article-hero{padding:62px 0 68px}
  .article-lead{font-size:16px}
  .article-layout{display:block;padding:58px 0 78px}
  .toc{position:static;margin-bottom:45px}
  .article-body h2{font-size:26px}
  .related-grid{grid-template-columns:1fr}
  .guide-grid{grid-template-columns:1fr}
}
@media(max-width:640px){
  .site-header .container{width:min(calc(100% - 32px),1264px)}
  .header-inner{min-height:64px}
  .header-cta{min-height:42px;padding:0 16px;font-size:12px}
}
@media(max-width:560px){
  .container{width:min(calc(100% - 28px),var(--max))}
  .site-header .container{width:min(calc(100% - 32px),1264px)}
  .breadcrumb{padding:16px 0}
  .article-hero{padding:50px 0 55px}
  .article-hero h1{font-size:36px}
  .article-lead{line-height:1.9}
  .article-layout{padding-top:45px}
  .summary-box,.definition-box{padding:22px 20px}
  .article-body>p{font-size:15px}
  .article-body h2{margin-top:55px;padding-left:14px;font-size:24px}
  .article-body h3{font-size:19px}
  .comparison{display:block;overflow-x:auto;white-space:nowrap}
  .comparison th,.comparison td{min-width:145px;white-space:normal}
  .check-grid{grid-template-columns:1fr}
  .article-cta{margin-left:-14px;margin-right:-14px;padding:34px 20px}
  .article-cta h2{font-size:25px}
  .button{width:100%;min-width:0;padding:0 18px}
  .related{padding:62px 0}
  .guide-hero{padding:66px 0 62px}
  .guide-hero h1{font-size:38px}
  .guide-list{padding:66px 0 78px}
  .guide-card{padding:26px 22px}
  .footer-inner{flex-direction:column;align-items:flex-start}
}
@media(max-width:520px){
  .brand img{width:150px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button,.related-card{transition:none}}