:root{color-scheme:dark;--ink:#080a12;--panel:#101528;--paper:#eef1fb;--sub:#bac3df;--line:#303a59;--cyan:#70e2f3;--blue:#8aa9ff;--grad:linear-gradient(115deg,#4f7cff,#22d3ee 52%,#a78bfa)}*{box-sizing:border-box}html{background:var(--ink);scroll-padding-top:24px}body{margin:0;color:var(--paper);background:radial-gradient(ellipse at 100% 0,#152648 0,transparent 44%),var(--ink);font-family:'Hiragino Kaku Gothic ProN','Noto Sans CJK JP',system-ui,sans-serif;line-height:1.95;overflow-wrap:anywhere;text-autospace:normal;text-spacing-trim:trim-start}a{color:var(--cyan);text-underline-offset:5px}a:hover{color:white}a:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:5px}img{max-width:100%;height:auto}.skip{position:absolute;left:12px;top:-80px;z-index:10;background:white;color:#080a12;padding:10px}.skip:focus{top:12px}.masthead{max-width:1320px;margin:auto;padding:27px 36px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px 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32px;border-bottom:1px solid var(--line)}.hero .lead{font-size:18px;color:var(--paper);max-width:860px}.meta,.audience{color:var(--sub);font-size:13px;margin:12px 0}.audience b{color:var(--paper)}.layout{display:grid;grid-template-columns:minmax(0,800px) 245px;gap:65px;align-items:start;margin:42px 0 70px}.prose{min-width:0;font-size:16px}.prose p{margin:14px 0 24px}.prose ul,.prose ol{padding-left:1.5em}.prose li{margin:12px 0}.prose h2:first-child{margin-top:0}.toc{position:sticky;top:28px;border-top:2px solid var(--cyan);padding-top:20px;font-size:13px}.toc ol{padding-left:18px}.toc li{padding:6px 0}.toc a{color:var(--sub)}.box{padding:25px 28px;border:1px solid var(--line);border-radius:12px;background:var(--panel);margin:32px 0}.box h2{margin:0 0 12px;font-size:21px}.primary-source{border-left:3px solid var(--cyan)}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;margin:24px 0}table{border-collapse:collapse;width:100%;font-size:14px}th,td{text-align:left;vertical-align:top;padding:15px 17px;border-bottom:1px solid var(--line)}th{background:#1a223b;color:white}tr:last-child td{border-bottom:0}caption{text-align:left;padding:12px 17px;color:var(--sub)}details{border-bottom:1px solid var(--line);padding:18px 0}summary{cursor:pointer;font-weight:700;min-height:44px}details p{color:var(--sub)}.illustration{margin:34px 0;border:1px solid var(--line);border-radius:12px;padding:20px;background:#10172b}.illustration svg{width:100%;height:auto;display:block}.illustration figcaption{color:var(--sub);font-size:12px;margin-top:15px}.sources{font-size:13px;color:var(--sub)}.sources li{margin:10px 0}.cta{padding:30px;background:linear-gradient(125deg,#182d50,#142331);border:1px solid #406588;border-radius:14px}.cta h2{margin:0 0 12px}.button{display:inline-flex;align-items:center;min-height:48px;border:1px solid var(--cyan);border-radius:99px;padding:10px 22px;text-decoration:none;color:var(--paper);margin-top:10px}.related{border-top:1px solid var(--line);padding-top:20px}.related ul{padding:0;list-style:none}.related a{display:block;padding:16px 0;border-bottom:1px solid var(--line)}footer{max-width:1200px;margin:0 auto;padding:32px 36px 46px;border-top:1px solid var(--line);color:var(--sub);font-size:12px}footer nav{display:flex;flex-wrap:wrap;gap:18px;margin-bottom:16px}.index-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:55px;margin:48px 0 80px}.category-nav{border-top:2px solid var(--cyan);padding-top:18px}.category-nav a{display:block;padding:13px 0;border-bottom:1px solid var(--line);font-size:14px}.entry{display:grid;grid-template-columns:80px 1fr;gap:20px;border-bottom:1px solid var(--line);padding:28px 0}.entry .number{font-size:36px;font-family:Georgia,serif;color:var(--blue)}.entry h2{font-size:23px;margin:0 0 9px}.entry h2 a{color:var(--paper);text-decoration:none}.entry p{font-size:14px;color:var(--sub);margin:8px 0}.tag{color:var(--cyan);font-size:12px}.category-description{max-width:800px;color:var(--sub)}@media(max-width:900px){.layout{grid-template-columns:minmax(0,1fr);gap:25px}.toc{position:static;grid-row:1}.toc ol{display:flex;flex-wrap:wrap;gap:8px 30px}.toc li{max-width:100%}.index-layout{grid-template-columns:1fr;gap:30px}.category-nav{display:flex;flex-wrap:wrap;gap:8px 20px}.category-nav a{max-width:100%}}@media(max-width:600px){.masthead{padding:18px 20px;flex-wrap:wrap;gap:12px}.masthead nav{gap:18px;width:100%;font-size:12px}.logo{width:160px}.shell{padding:0 20px}.draft{text-align:left;padding:8px 20px}.hero{padding-top:4px}.hero .lead{font-size:16px}h1{font-size:29px;line-height:1.6}h2{font-size:22px}.layout{margin-top:28px}.prose{font-size:16px}.box,.cta{padding:20px}.illustration{padding:12px}table{font-size:13px}th,td{padding:12px 9px}.entry{grid-template-columns:40px 1fr;gap:12px}.entry .number{font-size:26px}.entry h2{font-size:20px}footer{padding:24px 20px}.toc ol{display:block}.meta{font-size:12px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}
/* 2026-10-11: measured MITEKARA design values; article reading measure remains 760px. */
:root{--sub:#aab4d3;--line:rgba(238,241,251,.16);--panel:#0e1120;--cyan:#22d3ee;--blue:#8aa9ff;--grad:linear-gradient(115deg,#4f7cff,#22d3ee 52%,#a78bfa);--pad-x:clamp(16px,6vw,84px);--f-ja:"Shippori Mincho B1","Hiragino Mincho ProN",serif;--f-en:"EB Garamond",Georgia,serif;--f-body:"Zen Kaku Gothic New","Hiragino Kaku Gothic ProN",system-ui,sans-serif;--f-mono:"Space Mono",ui-monospace,monospace}
body{font-family:var(--f-body);line-height:1.85;background:radial-gradient(ellipse at 100% 0,#152648 0,transparent 40%),var(--ink)}
.masthead{max-width:none;padding:16px clamp(16px,5vw,56px);border:0;min-height:76px;background:linear-gradient(to bottom,#080a12dd,transparent)}.masthead .logo{width:199px}.masthead nav{gap:26px;font-size:13px}.masthead nav a{text-decoration:none;color:var(--paper)}.masthead nav a:last-child{background:var(--grad);color:var(--ink);border-radius:999px;padding:10px 24px;font-weight:700}.draft{background:#0e1120;color:var(--sub);font-size:12px}
.shell{max-width:1448px;padding:0 var(--pad-x)}.crumb{margin:28px 0 12px;font-size:12px}.crumb a{min-height:44px}.eyebrow{display:flex;align-items:center;gap:12px;font-family:var(--f-mono);font-size:11px;letter-spacing:.32em;margin-bottom:24px;color:var(--cyan)}.eyebrow:before{content:"";width:32px;height:1px;background:var(--cyan);flex:none}
h1,h2,h3{font-family:var(--f-ja);letter-spacing:.02em;font-weight:800}h1{font-size:clamp(32px,4.4vw,64px);line-height:1.35;max-width:1100px;margin:0 0 24px;text-wrap:pretty}h2{font-size:clamp(25px,3.4vw,40px);line-height:1.5;margin:64px 0 24px}h3{font-size:20px}.hero{padding:40px 0 44px;border-bottom:0}.hero .lead{font-size:16px;line-height:1.85;max-width:800px;color:var(--sub)}.meta,.audience{font-size:13px;color:var(--sub)}
.article-visual{margin:0 0 64px;position:relative;border-radius:14px;overflow:hidden;border:1px solid var(--line)}.article-visual picture{display:block;overflow:hidden;aspect-ratio:21/9}.article-visual img{display:block;width:100%;height:100%;object-fit:cover}.article-visual figcaption{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:16px 22px;background:#0e1120;color:var(--sub);font-size:12px}.article-visual figcaption span:first-child{font-family:var(--f-mono);color:var(--cyan);letter-spacing:.12em}.article-visual:after{content:"";position:absolute;inset:12px 12px 58px;pointer-events:none;border:1px solid #eef1fb30;border-radius:5px}
.layout{grid-template-columns:minmax(0,760px) minmax(210px,260px);gap:clamp(36px,6vw,86px);justify-content:space-between;margin:0 0 76px}.prose{font-size:16px;line-height:1.85}.prose section{scroll-margin-top:28px}.prose p{margin:16px 0 24px}.toc{top:28px;border-top:1px solid var(--cyan);line-height:1.85}.toc a{display:block;padding:5px 0}.toc li{padding:0}.box{border-radius:12px;padding:32px;background:var(--panel)}.box h2{font-size:26px}.illustration{background:#0e1120;border-radius:14px;padding:24px;margin:0 0 54px}.illustration figcaption{font-size:12px;line-height:1.85}.cta{display:block;padding:40px;background:linear-gradient(125deg,#12203b,#0e1120);border:1px solid var(--line);border-radius:14px}.cta h2{font-size:clamp(26px,3.4vw,40px)}.button{background:var(--grad);color:#080a12;font-family:var(--f-body);font-size:14px;font-weight:700;letter-spacing:.06em;padding:15px 30px;border:1px solid transparent;border-radius:999px;min-height:56px;transition:transform .35s cubic-bezier(.22,1,.36,1)}.button:hover{color:#080a12;transform:translateY(-2px)}.sources{font-size:13px;line-height:1.85}.related a{min-height:44px}.index-layout{grid-template-columns:200px minmax(0,1fr);gap:64px;margin:40px 0 76px}.entry{grid-template-columns:180px 40px 1fr;gap:22px;padding:32px 0}.entry h2{font-size:26px}.entry .number{font-family:var(--f-en);font-style:italic;font-size:32px;color:var(--blue)}.entry-image{display:block;align-self:start;border-radius:12px;overflow:hidden;aspect-ratio:4/3}.entry-image picture{display:block;height:100%}.entry-image img{display:block;width:100%;height:100%;object-fit:cover;transition:transform .9s cubic-bezier(.22,1,.36,1)}.entry-image:hover img{transform:scale(1.05)}
footer{max-width:none;padding:44px var(--pad-x) 64px;font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:var(--sub)}footer nav{width:100%;gap:24px}footer nav a{min-height:44px;display:inline-flex;align-items:center;font-size:12px;color:var(--sub)}
.reveal-ready{opacity:0;transform:translateY(18px);transition:opacity .8s cubic-bezier(.22,1,.36,1),transform .8s cubic-bezier(.22,1,.36,1)}.reveal-ready.is-visible{opacity:1;transform:none}.article-visual.reveal-ready{transform:translateY(12px)}
@media(max-width:1000px){.entry{grid-template-columns:120px 32px 1fr;gap:16px}.index-layout{gap:32px}}
@media(max-width:900px){.layout{grid-template-columns:1fr;gap:32px}.toc{grid-row:1;position:static}.index-layout{grid-template-columns:1fr}.toc ol{display:flex;flex-wrap:wrap;gap:10px 30px}.toc a{min-height:44px}.category-nav{display:flex;flex-wrap:wrap;gap:8px 20px}}
@media(max-width:600px){.masthead{padding:16px 23.4px;gap:12px;flex-wrap:wrap}.masthead .logo{width:160px}.masthead nav{font-size:12px;gap:14px;justify-content:space-between}.masthead nav a:last-child{padding:8px 16px}.hero{padding:24px 0 32px}h1{font-size:32px;line-height:1.5}h2{font-size:26px;margin-top:48px}.hero .lead{font-size:16px}.eyebrow{font-size:11px;letter-spacing:.18em}.article-visual{margin-bottom:40px}.article-visual picture{aspect-ratio:4/3}.article-visual figcaption{padding:14px 16px;font-size:12px;gap:4px}.article-visual:after{bottom:90px}.toc ol{display:block}.box,.cta{padding:24px 20px}.illustration{padding:14px}.entry{grid-template-columns:32px 1fr;gap:14px;padding:26px 0}.entry-image{grid-column:1/-1;aspect-ratio:16/9;margin-bottom:8px}.entry h2{font-size:23px}.entry .number{font-size:28px}.index-layout{margin-top:24px}.button{width:100%;justify-content:center;padding:15px 20px}footer{padding:44px var(--pad-x) 64px}footer nav{gap:8px 20px}}
@media(prefers-reduced-motion:reduce){.reveal-ready{opacity:1;transform:none;transition:none}.button,.entry-image img{transition:none}}



:root{--f-ja:"Shippori Mincho","Zen Kaku Gothic New","Shippori Mincho B1",serif;--f-body:"Zen Kaku Gothic New",sans-serif}.masthead img.logo{height:34px}.eyebrow{font-size:12px}.article-visual:after{display:none}

.crumb li+li:before{content:"›";display:inline-block;margin-right:10px;color:var(--sub)}.crumb{gap:8px 10px}.crumb li{display:inline-flex;align-items:baseline;flex-wrap:wrap}
.title-detail{display:block;font-family:var(--f-body);font-size:.55em;line-height:1.6;letter-spacing:.02em;font-weight:500;color:var(--sub);margin-top:.6em}
@media(max-width:600px){.masthead{flex-wrap:nowrap;justify-content:space-between;min-height:76px}.masthead nav{width:auto;gap:0}.masthead nav a:not(:last-child){display:none}.masthead .logo{width:160px}.title-detail{font-size:20px;line-height:1.6}.masthead nav a:last-child{white-space:nowrap}}
@media(max-width:360px){.masthead{padding-inline:16px}.masthead .logo{width:140px}}

footer{align-items:center}footer nav{width:auto;margin-bottom:0;gap:18px}footer nav a{font-size:11px}@media(max-width:600px){footer nav{width:100%;gap:8px 16px}}
.crumb li:last-child:before{display:none}h1{max-width:1280px}.keep-word{white-space:nowrap}

/* F493: a shared 16:9 subject frame and a compact topic label. */
.article-page .entry-image,.article-page .related-image{position:relative;isolation:isolate;aspect-ratio:16/9;border:1px solid #303a59;border-radius:10px;background:#101528}
.article-page .entry{grid-template-columns:220px 40px minmax(0,1fr);align-items:start;gap:24px}
.article-page .entry .number{font-variant-numeric:tabular-nums;line-height:1.2;padding-top:4px}
.article-page .entry h2{line-height:1.55;text-wrap:pretty;word-break:normal;overflow-wrap:break-word}
.article-page .tag{display:block;line-height:1.7;margin-bottom:8px}
.article-page .thumb-label{position:absolute;z-index:2;left:10px;top:10px;display:inline-flex;align-items:center;min-height:24px;padding:3px 8px;border:1px solid #bac3df55;border-radius:4px;background:#080a12ed;color:#eef1fb;font-family:var(--f-body);font-size:12px;line-height:1.3;font-weight:500;letter-spacing:.04em;pointer-events:none}
.article-page .article-visual picture{aspect-ratio:16/9}
.article-page .article-visual>.thumb-label{left:16px;top:16px}
.article-page .entry-image:hover img,.article-page .entry-image:focus-visible img,.article-page .related-card:hover img,.article-page .related-card:focus-visible img{transform:scale(1.035)}
.article-page .related ul{display:grid;grid-template-columns:1fr;gap:0}
.article-page .prose .related li{margin:0}
.article-page .related-card{display:grid;grid-template-columns:160px minmax(0,1fr);gap:20px;align-items:center;text-decoration:none}
.article-page .related-image{display:block;overflow:hidden}
.article-page .related-image picture{display:block;width:100%;height:100%}
.article-page .related-image img{display:block;width:100%;height:100%;object-fit:cover;transition:transform .6s cubic-bezier(.22,1,.36,1)}
.article-page .related-title{font-size:16px;line-height:1.85;color:var(--paper);text-wrap:pretty}
@media(max-width:1000px){.article-page .entry{grid-template-columns:120px 32px minmax(0,1fr);gap:16px}.article-page .entry-image .thumb-label{left:6px;top:6px}}
@media(max-width:600px){.article-page .entry{grid-template-columns:32px minmax(0,1fr);gap:14px}.article-page .entry-image{grid-column:1/-1;margin-bottom:8px}.article-page .article-visual picture{aspect-ratio:16/9}.article-page .related-card{grid-template-columns:112px minmax(0,1fr);gap:14px}.article-page .related-title{font-size:14px}.article-page .related-image .thumb-label{left:5px;top:5px;font-size:12px;padding:2px 5px}.article-page .article-visual>.thumb-label{left:10px;top:10px}}
@media(prefers-reduced-motion:reduce){.article-page .entry-image img,.article-page .related-image img{transition:none;transform:none!important}}
.article-page .entry-phrase{white-space:nowrap}.article-page .entry-title-detail{display:block;font-family:var(--f-body);font-size:15px;line-height:1.8;font-weight:500;color:var(--sub);margin-top:8px;letter-spacing:.02em}
@media(max-width:600px){.article-page .entry-title-detail{font-size:14px}}