:root{
  --navy:#1c3f72;
  --navy-d:#16335d;
  --navy-dd:#122b4f;
  --blue:#2f6fc4;
  --blue-l:#5b93dc;
  --ink:#1f2a3a;
  --muted:#69727f;
  --line:#e6eaf0;
  --line-soft:#eef2f7;
  --surface:#f5f8fc;
  --serif:"Noto Serif JP",serif;
  --sans:"Noto Sans JP",-apple-system,BlinkMacSystemFont,sans-serif;
  --maxw:1080px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:#fff;line-height:1.95;font-size:15px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* header */
.site-head{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line-soft)}
.head-inner{max-width:var(--maxw);margin:0 auto;padding:0 32px;height:68px;display:flex;align-items:center;justify-content:space-between}
.logo{display:inline-flex;align-items:center;gap:11px}
.logo-mark{width:32px;height:32px;border-radius:9px;background:var(--navy);display:flex;align-items:center;justify-content:center;color:#fff}
.logo-mark svg{width:18px;height:18px}
.logo-wm{font-family:var(--serif);font-size:19px;font-weight:600;letter-spacing:.1em;color:var(--navy)}
.back{font-size:13px;color:var(--muted);display:inline-flex;align-items:center;gap:6px;transition:color .2s}
.back:hover{color:var(--blue)}

main{max-width:var(--maxw);margin:0 auto;padding:0 32px}

/* article header: meta left + photo right */
.article-head{display:grid;grid-template-columns:1.15fr .85fr;gap:46px;align-items:center;padding:52px 0 40px}
.eyebrow{font-size:11px;letter-spacing:.18em;color:var(--blue);font-weight:500;margin-bottom:16px}
.case-badge{display:inline-block;background:var(--navy);color:#fff;font-size:12px;letter-spacing:.06em;padding:5px 14px;border-radius:6px;margin-bottom:20px}
.article-head h1{font-family:var(--serif);font-size:33px;font-weight:600;line-height:1.45;letter-spacing:.03em;color:var(--navy);margin-bottom:20px}
.lead-deck{font-size:14.5px;color:var(--muted);line-height:1.95;margin-bottom:28px}
.article-meta{display:grid;grid-template-columns:1fr 1fr;gap:20px 40px}
.article-meta .k{display:block;font-size:15px;font-weight:500;color:var(--ink);margin-bottom:4px}
.article-meta .v{font-size:13.5px;color:var(--muted)}
.head-photo{border-radius:16px;overflow:hidden;background:#dde6f1;aspect-ratio:4/5}
.head-photo img{width:100%;height:100%;object-fit:cover;object-position:center 12%}

/* key metrics */
.article-key{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:14px;background:var(--surface);overflow:hidden;margin:8px 0 8px}
.kv{padding:26px 20px;text-align:center}
.kv+.kv{border-left:1px solid var(--line)}
.kv-num{font-family:var(--serif);font-size:26px;font-weight:600;color:var(--navy);line-height:1.1;margin-bottom:8px}
.kv-lbl{font-size:12px;color:var(--muted)}

/* body + TOC */
.article-body{display:grid;grid-template-columns:1fr 240px;gap:54px;padding:50px 0 20px;align-items:start}
.toc{position:sticky;top:92px;border:1px solid var(--line);border-radius:14px;padding:20px 22px;background:#fff}
.toc-ttl{font-size:12px;color:var(--muted);letter-spacing:.04em;margin-bottom:14px}
.toc a{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted);padding:7px 0;transition:color .2s}
.toc a::before{content:"";width:7px;height:7px;border-radius:50%;border:1.5px solid #c3ccd8;flex-shrink:0}
.toc a:hover{color:var(--blue)}
.toc a.active{color:var(--navy);font-weight:500}
.toc a.active::before{background:var(--blue);border-color:var(--blue)}

.qa{padding:0 0 26px;margin-bottom:26px;border-bottom:1px solid var(--line-soft)}
.qa:last-child{border-bottom:none}
.qa-q{font-family:var(--serif);font-size:19px;font-weight:600;color:var(--navy);line-height:1.55;margin-bottom:14px}
.qa-a p{font-size:15px;color:#33405a;line-height:2;margin-bottom:14px}
.qa-a p:last-child{margin-bottom:0}

.pullquote{position:relative;font-family:var(--serif);font-size:22px;font-weight:600;line-height:1.7;color:var(--navy);text-align:center;letter-spacing:.03em;padding:30px 56px;margin:10px 0 30px}
.pullquote::before,.pullquote::after{position:absolute;font-size:54px;color:#c7d6ea;font-family:Georgia,serif;line-height:1}
.pullquote::before{content:"\201C";left:14px;top:6px}
.pullquote::after{content:"\201D";right:14px;bottom:-12px}

/* article nav */
.article-nav{max-width:var(--maxw);margin:30px auto 0;padding:26px 32px;border-top:1px solid var(--line);display:flex;justify-content:space-between;font-size:13.5px}
.article-nav a{color:var(--blue);display:inline-flex;align-items:center;gap:7px;transition:opacity .2s}
.article-nav a:hover{opacity:.65}

/* footer */
.site-foot{background:var(--navy-dd);color:rgba(255,255,255,.7);padding:50px 32px 30px;margin-top:60px}
.foot-in{max-width:var(--maxw);margin:0 auto;text-align:center}
.site-foot .logo{justify-content:center;margin-bottom:12px}
.site-foot .logo-wm{color:#fff}
.site-foot .logo-mark{background:rgba(255,255,255,.12)}
.site-foot .tag{font-size:12.5px}
.site-foot .copy{font-size:11.5px;color:rgba(255,255,255,.4);margin-top:26px}

@media(max-width:860px){
  .article-head{grid-template-columns:1fr;gap:30px}
  .head-photo{aspect-ratio:16/10;max-height:340px;order:-1}
  .article-body{grid-template-columns:1fr;gap:24px}
  .toc{position:static;order:-1}
}
@media(max-width:560px){
  .head-inner,main,.article-nav{padding-left:20px;padding-right:20px}
  .article-head h1{font-size:26px}
  .article-key{grid-template-columns:1fr}
  .kv+.kv{border-left:none;border-top:1px solid var(--line)}
  .article-meta{grid-template-columns:1fr}
  .pullquote{font-size:18px;padding:24px 40px}
  .article-nav{flex-direction:column;gap:14px}
}