@charset "utf-8";
:root{--ink:#172541;--paper:#f4f1e9;--accent:#314ba2;--muted:#656e77;--line:#c5c7ce}
*{box-sizing:border-box}html,body{margin:0;max-width:100%;min-width:0}body{background:var(--paper);color:var(--ink);font:16px/1.6 system-ui,-apple-system,"PingFang SC",sans-serif;overflow-x:clip}
a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}
.ledger-mast{background:var(--ink);color:#fff;padding:18px max(20px,calc((100vw - 1190px)/2));display:flex;align-items:center;justify-content:space-between;gap:22px;flex-wrap:wrap}
.ledger-brand{display:flex;flex-direction:column;line-height:1.2}.ledger-brand>a{font-size:29px;font-weight:900;letter-spacing:.08em}.ledger-brand span{font-size:12px;color:#c2cee7;margin-top:6px}
.ledger-mast nav{display:flex;gap:20px;flex-wrap:wrap;font-size:13px}.ledger-mast nav a{color:#e6edff}
.ledger-container{max-width:1190px;margin:auto;padding:22px}
.ledger-hero{padding:46px 32px 30px;border-bottom:4px solid var(--ink);background:#e9e9e5}
.eyebrow{font-size:12px;letter-spacing:.15em;color:var(--accent);font-weight:800}
.ledger-hero h1{font:700 clamp(34px,5vw,64px)/1.17 Georgia,"Noto Serif SC",serif;letter-spacing:-.04em;margin:12px 0}
.ledger-hero h1 em{font-style:normal;color:var(--accent)}.ledger-hero>p{max-width:800px}
.ledger-numbers{display:flex;flex-wrap:wrap;gap:28px;margin-top:22px}.ledger-numbers>div{border-left:3px solid var(--accent);padding-left:14px;display:grid}.ledger-numbers b{font-size:31px}.ledger-numbers span{font-size:12px;color:var(--muted)}
.ledger-method{padding:30px 0;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:24px;border-bottom:1px solid var(--line)}
.ledger-method h2,.ledger-block h2{font:700 clamp(22px,2.7vw,32px)/1.3 Georgia,"Noto Serif SC",serif;margin:8px 0}
.formula-box{background:#dfe4f0;padding:22px;border-left:5px solid var(--accent);display:grid;align-content:center;gap:6px;min-width:0;overflow-wrap:anywhere}
.formula-box strong{font-size:20px}.formula-box span{font-size:17px}.formula-box small{color:#526070}
.ledger-block{padding:25px 0;border-bottom:1px solid var(--line)}
.ledger-section-head{display:flex;justify-content:space-between;align-items:end;gap:15px;flex-wrap:wrap;margin-bottom:22px}
.ledger-section-head p{margin:4px 0}.ledger-section-head>a{font-weight:700;color:var(--accent)}
.academy-tiles{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:12px}
.academy-tile{min-width:0;background:#fff;border:1px solid #d0d3da;padding:9px}
.academy-tile a{display:grid;gap:8px}.academy-tile img{width:100%;height:auto;aspect-ratio:2/3;object-fit:cover;background:#e4e6e9}
.academy-tile strong{font-size:14px;line-height:1.35;overflow-wrap:anywhere}.academy-tile-data{display:grid;gap:3px;font-size:12px}.academy-tile-data b{color:var(--accent);font-size:15px}.academy-tile-data span,.academy-tile-data small{color:var(--muted)}
.history-tiles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.history-tile{background:#fff;border:1px solid var(--line);min-width:0}
.history-tile a{display:grid;grid-template-columns:94px minmax(0,1fr);gap:11px;padding:9px;min-width:0}
.history-tile img{width:94px;height:142px;object-fit:cover;background:#e4e6e9}
.history-tile span{display:grid;align-content:start;gap:5px;min-width:0}
.history-tile strong{font-size:15px;line-height:1.4;overflow-wrap:anywhere}.history-tile small{font-size:12px;color:var(--muted)}.history-tile em{font-style:normal;font-size:12px;color:#6c747b;line-height:1.45}
.research-paths{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.research-paths a{display:flex;justify-content:space-between;gap:10px;background:#fff;border-left:4px solid var(--accent);padding:18px;font-weight:700}.research-paths span{font-size:12px;color:var(--muted)}
.browse-lead{padding:25px 10px 20px}.browse-lead h1{font:700 clamp(28px,4vw,45px)/1.2 Georgia,"Noto Serif SC",serif}.browse-lead p{max-width:830px}
.crumb{font-size:13px;color:var(--muted);margin:12px 0 24px}.research-detail{display:grid;grid-template-columns:minmax(160px,260px) minmax(0,1fr);gap:30px;padding:25px;background:#fff}
.research-detail figure{margin:0}.research-detail img{width:100%;height:auto;aspect-ratio:2/3;object-fit:cover}
.research-detail h1{font-size:clamp(27px,3.5vw,43px);line-height:1.2;margin:8px 0}.detail-original{color:var(--muted)}
.detail-facts{display:grid;grid-template-columns:120px minmax(0,1fr);gap:7px 10px}.detail-facts dt{color:var(--muted)}.detail-facts dd{margin:0}
.editorial-note{padding:13px;background:#e8eaf1;color:#5d6270;font-size:13px}.pager{display:flex;gap:16px;padding:25px 0}
.ledger-foot{background:var(--ink);color:#c6d0e1;padding:20px max(20px,calc((100vw - 1190px)/2));font-size:12px}.ledger-foot a{color:#fff}
@media(max-width:1000px){.academy-tiles{grid-template-columns:repeat(4,minmax(0,1fr))}.history-tiles{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:700px){.ledger-container{padding:12px}.ledger-mast{padding:14px}.ledger-mast nav{gap:10px}.ledger-hero{padding:24px 16px}.ledger-method{grid-template-columns:minmax(0,1fr)}.academy-tiles{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.history-tiles{grid-template-columns:minmax(0,1fr)}.research-paths{grid-template-columns:minmax(0,1fr)}.research-detail{grid-template-columns:minmax(0,1fr);padding:15px}.research-detail img{max-width:220px}.ledger-numbers{gap:12px}.ledger-numbers>div{min-width:90px}}
@media(max-width:360px){.history-tile a{grid-template-columns:75px minmax(0,1fr)}.history-tile img{width:75px;height:113px}.ledger-mast nav{font-size:12px}}