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:root{color-scheme:light;--paper:#f8f6ee;--white:#fffefa;--ink:#273c38;--muted:#5c6c65;--line:#d8dfd5;--teal:#116d5e;--mint:#e5efdf;--violet:#726099;--dark:#183d35;--radius:18px;font-family:"Avenir Next",Avenir,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.65;background:var(--paper);color:var(--ink);scroll-behavior:smooth;scroll-padding-top:108px}
*{box-sizing:border-box}body{margin:0}h1,h2,h3,p,figure{margin:0}h1,h2,h3{text-wrap:balance}p{overflow-wrap:break-word}h1,h2{font-family:"Iowan Old Style","Palatino Linotype",Georgia,serif;font-weight:400;letter-spacing:-.035em}h1{font-size:clamp(48px,5.3vw,74px);line-height:1.04}h1 em{color:var(--teal);font-size:.87em;line-height:1.15}h2{font-size:clamp(34px,3.6vw,49px);line-height:1.13}h2 em{color:var(--teal)}h3{font-size:20px;line-height:1.35;letter-spacing:-.025em;font-weight:600}p+p{margin-top:16px}a{color:inherit;text-underline-offset:4px;text-decoration-thickness:1px}a:hover{text-decoration-color:var(--teal)}button{font:inherit}button,summary{cursor:pointer}button,a,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,summary:focus-visible,button:focus-visible{outline:3px solid #9274c3;outline-offset:5px;border-radius:4px}img{max-width:100%;height:auto;display:block}::selection{background:#d6e8b9;color:var(--dark)}.skip-link{position:absolute;z-index:50;left:20px;top:-100px;background:var(--dark);color:white;padding:12px 20px}.skip-link:focus{top:10px}
.site-header{position:sticky;top:0;z-index:10;background:rgba(248,246,238,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}.header-inner{max-width:1300px;margin:auto;min-height:88px;display:flex;gap:30px;align-items:center;justify-content:space-between;padding:14px 40px}.brand{display:inline-flex;gap:10px;align-items:center;text-decoration:none;flex-shrink:0}.brand img{border-radius:12px}.brand [lang=ja]{font-size:28px;font-weight:600;letter-spacing:-1px}.brand-roman{font-family:Georgia,serif;font-size:23px;font-style:italic;color:var(--teal);padding-left:8px;border-left:1px solid var(--line);line-height:1.1}.header-inner nav{display:flex;gap:28px;align-items:center;flex-wrap:wrap}.header-inner nav a{font-size:13px;font-weight:500;text-decoration:none;padding:8px 0;border-bottom:1px solid transparent}.header-inner nav a:hover{border-color:var(--teal)}.header-hn{font-size:12px;text-decoration:none;display:flex;gap:12px;align-items:center}.header-hn span{font-size:18px}
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#toi-top{padding-top:65px;padding-bottom:32px;border-bottom:0}.toi-hero-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:56px;align-items:center}.toi-lead{max-width:475px;font-size:16px;line-height:1.85;color:var(--muted);margin-top:25px}.hero-figure{position:relative;min-width:0}.hero-figure::before{content:"";position:absolute;z-index:-1;inset:-30px -20px 20px;background:#e4eddf;border-radius:50% 42% 46% 40%}.screen-link{display:block;text-decoration:none;border-radius:15px;overflow:hidden;border:9px solid #283832;background:#283832;box-shadow:0 18px 30px -20px #1c382d60;transition:transform .2s,box-shadow .2s}.screen-link:hover{transform:translateY(-3px);box-shadow:0 24px 35px -22px #1c382d80}.screen-link img{width:100%;aspect-ratio:4/3;object-fit:contain;background:var(--paper)}.hero-screen{border-width:11px;border-radius:20px}.hero-figure figcaption{font-size:11px;line-height:1.7;color:var(--muted);display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin:17px 5px 0}.capture-dot{height:5px;width:5px;background:var(--teal);border-radius:50%;flex-shrink:0}.zoom-hint{color:var(--teal);font-size:11px}.hero-figure .zoom-hint{margin-left:auto}.toi-entry-points{display:flex;flex-wrap:wrap;justify-content:space-between;gap:15px;margin-top:55px;padding:20px 0;border-block:1px solid var(--line);font-size:12px;color:var(--muted)}.toi-entry-points span::before{content:"+";margin-right:12px;color:var(--teal);font-size:16px}
#toi-pedagogy{display:grid;grid-template-columns:.9fr 1.1fr;gap:0 80px;padding-top:72px}#toi-pedagogy>.section-label{grid-column:1/-1}#toi-pedagogy h2{max-width:450px}.toi-thesis{font-size:18px;line-height:1.8}.toi-thesis p+p{font-size:16px;color:var(--muted)}#toi-pedagogy>.toi-reading-link{grid-column:2;margin-top:20px}
.app-section{background:#eef1e7;border-bottom:0;border-radius:24px;margin-top:30px;max-width:1220px;padding:65px 44px}.app-intro{display:grid;grid-template-columns:1fr .65fr;gap:80px;align-items:end}.app-intro>p{color:var(--muted);font-size:15px;margin-bottom:4px}.app-intro h2{font-size:42px}.app-gallery{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-top:36px}.app-gallery figcaption{display:flex;gap:16px;margin-top:20px;font-size:13px;line-height:1.8;color:var(--muted)}.app-gallery figcaption strong{font-weight:600;color:var(--ink);font-size:14px}.gallery-number{font:italic 27px/1.3 Georgia,serif;color:var(--teal)}.capture-note{font-size:11px;color:var(--muted);max-width:850px;margin-top:30px;line-height:1.8}
#toi-example{padding-top:100px}.toi-cases{margin-top:42px}.toi-case{border-top:1px solid var(--line)}.toi-case:last-child{border-bottom:1px solid var(--line)}.toi-case>summary{list-style:none;padding:24px 45px 24px 0;font-family:Georgia,serif;font-size:23px;line-height:1.4;letter-spacing:-.02em;position:relative}.toi-case>summary::-webkit-details-marker{display:none}.toi-case>summary::after{content:"+";position:absolute;right:4px;top:23px;font:400 25px/1.2 sans-serif;color:var(--teal)}.toi-case[open]>summary::after{content:"−"}.toi-case[open]>summary{color:var(--teal)}.toi-case-body{padding:4px 0 35px}.toi-case-context{font-size:14px;line-height:1.8;color:var(--muted);max-width:740px;margin-bottom:20px}.toi-journey{margin-top:30px}.toi-journey-step{display:grid;grid-template-columns:28px 1.3fr 1fr;gap:25px;align-items:start;padding:27px 0;border-top:1px solid var(--line)}.toi-journey-number{white-space:nowrap;font:italic 24px/1.5 Georgia,serif;color:var(--teal)}.toi-stage-label{font-size:10px;letter-spacing:.1em;color:var(--muted);line-height:1.7;margin-bottom:15px}.toi-message{padding:18px 20px;border:1px solid #dce3d8;border-radius:2px 15px 15px 15px;background:var(--white);max-width:100%}.toi-message+.toi-message{margin-top:12px}.toi-message.toi-child{background:#e4eee6;border-color:#d4e2d7;border-radius:15px 2px 15px 15px;margin-left:30px}.toi-message-label+p{margin-top:0}.toi-message-label{font-size:10px;line-height:1.6;display:block;letter-spacing:.035em;color:var(--muted);margin-bottom:6px}.toi-message p:not(.toi-message-label){font-size:15px;line-height:1.75}.toi-reason{padding:4px 0 0 22px;border-left:2px solid #bdcdb8}.toi-reason h3{font-size:21px;font-family:Georgia,serif;font-weight:400;line-height:1.3}.toi-reason p{font-size:14px;line-height:1.85;color:var(--muted);margin-top:11px}.toi-case-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:55px;align-items:start}.toi-gap{font-size:11px;line-height:1.7;padding:14px 0;color:var(--muted)}.toi-original{margin-top:20px}.toi-original>summary{font-size:12px;color:var(--teal);padding-block:10px;width:fit-content}.toi-original dl{padding-left:22px;border-left:1px solid var(--line);margin:15px 0 0;max-width:880px}.toi-original dt{font-size:11px;color:var(--muted);margin-top:18px}.toi-original dd{font-size:15px;line-height:1.9;margin:5px 0 0}
#toi-how{counter-reset:principle}.toi-design-rows{margin-top:42px}.toi-design-row{display:grid;grid-template-columns:1fr 1.5fr;gap:90px;padding:32px 0;border-top:1px solid var(--line);counter-increment:principle}.toi-design-row>div:first-child{position:relative;padding-left:46px}.toi-design-row>div:first-child::before{content:"0" counter(principle);font:italic 24px/1 Georgia,serif;color:var(--violet);position:absolute;top:3px;left:0}.toi-design-row h3{font:400 27px/1.25 Georgia,serif;letter-spacing:-.02em}.toi-design-source{font-size:12px;color:var(--teal);margin-top:13px}.toi-design-row p{font-size:15px;line-height:1.9;color:var(--muted)}.toi-evidence-label{font-size:13px;font-weight:600;color:var(--ink)}.toi-help-ladder{display:flex;flex-wrap:wrap;gap:7px 0;list-style:none;padding:15px 0 0;margin:12px 0 0;border-top:1px dashed var(--line);font-size:11px;line-height:1.6;color:var(--teal)}.toi-help-ladder li:not(:last-child)::after{content:"→";padding:0 10px;color:#89a295}
.toi-context-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px;margin-top:38px}.toi-context-grid article{border-top:2px solid #c8d9be;padding-top:23px}.toi-context-grid h3{font:400 25px/1.2 Georgia,serif}.toi-context-grid p{font-size:14px;color:var(--muted);line-height:1.85;margin-top:17px}.weekly-feature{display:grid;grid-template-columns:1.3fr 1fr;gap:65px;align-items:center;margin-top:55px;padding:32px;background:#eeeaf3;border-radius:20px}.weekly-feature .section-label{color:#6a568c;margin-bottom:15px}.weekly-feature h3{font:400 30px/1.2 Georgia,serif;max-width:300px}.weekly-feature figcaption>p:not(.section-label){font-size:14px;color:var(--muted);margin-top:18px;line-height:1.85}.weekly-feature .zoom-hint{display:block;margin-top:18px;color:#6a568c}.toi-subjects{margin-top:35px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.toi-subjects summary{font-size:15px;font-weight:500;padding:20px 0}.toi-subject-list{margin:5px 0 12px}.toi-subject-list>div{display:grid;grid-template-columns:185px 1fr;gap:30px;padding:14px 0;border-top:1px solid var(--line);font-size:14px}.toi-subject-list dt{font-weight:500}.toi-subject-list dd{margin:0;color:var(--muted)}.toi-subjects>.toi-reading-link{margin:0 0 22px}
.research-section{background:var(--dark);color:#f3f4e9;border-radius:24px;max-width:1220px;margin-top:32px;padding:65px 44px;border:0}.research-section .section-label{color:#bfdb9e}.research-section h2 em{color:#cbe0b2}.research-section .toi-section-intro{color:#c1d2c6}.toi-boundaries{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px;margin-top:38px;padding:27px 0;border-block:1px solid #3d5c4e}.toi-boundaries h3{font-size:15px;font-weight:500;color:#f4f4e9}.toi-boundaries p{font-size:13px;line-height:1.85;color:#bdcec1;margin-top:12px}.toi-research-list{margin-top:30px}.toi-research-item{border-bottom:1px solid #426151}.toi-research-item>summary{display:flex;align-items:baseline;gap:17px;padding:20px 0;font-size:15px;line-height:1.5;font-weight:500;list-style:none}.toi-research-item>summary::-webkit-details-marker{display:none}.toi-research-item>summary::after{content:"+";color:#bfd59d;font-size:23px;line-height:1;margin-left:auto;padding-left:14px}.toi-research-item[open]>summary::after{content:"−"}.toi-research-num{color:#a4b79b;font:italic 17px/1.4 Georgia,serif}.toi-research-body{padding:0 35px 26px;max-width:880px;font-size:14px;line-height:1.9;color:#d9e4d8}.toi-research-body p+p{margin-top:16px}.toi-research-body a{color:#d3e7ac}.toi-research-limit{font-size:13px;color:#b6cbbd;border-left:1px solid #799b77;padding-left:16px}.toi-measure{margin-top:33px;padding:22px 24px;background:#254b3d;border-radius:7px}.toi-measure .toi-meta{color:#bad2a3;font-size:10px}.toi-measure p{font:400 24px/1.45 Georgia,serif;max-width:900px;margin-top:10px;color:#f1f4df}
#toi-engine{padding-top:105px}.toi-flow{display:grid;grid-template-columns:.7fr auto 1fr auto 1.2fr auto 1fr;align-items:center;gap:15px;margin-top:35px;padding:28px;background:#edf1e8;border-radius:12px}.toi-node{background:var(--white);border:1px solid #c7d7c6;border-radius:8px;padding:22px 13px;text-align:center;font-size:13px;line-height:1.6}.toi-agents{display:grid;gap:9px}.toi-agents .toi-node{padding:12px;color:var(--teal);background:#e2ecdb}.toi-arrow{color:#8aa07b;font-size:24px}.toi-flow-detail{font-size:14px;line-height:1.9;max-width:930px;color:var(--muted);margin-top:24px}.toi-stack{font-size:11px;letter-spacing:.02em;color:var(--teal);padding-top:20px;margin-top:25px;border-top:1px dashed var(--line)}.toi-story-grid{display:grid;grid-template-columns:1.2fr .7fr;gap:100px}.toi-story-copy{font-size:16px;line-height:1.9;max-width:650px;margin-top:25px;color:var(--muted)}.toi-current{border-left:1px solid var(--line);padding-left:40px}.toi-current h3{font:400 27px/1.2 Georgia,serif}.toi-current ul{list-style:none;margin:25px 0 0;padding:0}.toi-current li{padding:13px 0;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.toi-closing{display:flex;gap:35px;justify-content:space-between;align-items:center}.toi-closing h2{font-size:40px}.toi-closing p{margin-top:15px;font-size:15px;color:var(--muted)}.toi-closing .toi-button{flex-shrink:0}.site-footer{max-width:1300px;padding:38px 40px 48px;margin:auto;display:flex;gap:35px;align-items:center;justify-content:space-between;color:var(--muted);font-size:12px;line-height:1.8}.site-footer p{margin-right:auto}.site-footer>a:last-child{font-size:11px;color:var(--teal)}
#screenshot-viewer{padding:0;border:0;border-radius:14px;width:min(1300px,95vw);max-width:95vw;max-height:94dvh;overflow:auto;background:var(--paper);color:var(--ink);box-shadow:0 30px 100px #001d1b70}#screenshot-viewer::backdrop{background:#092a25d9;backdrop-filter:blur(6px)}.viewer-toolbar{display:flex;align-items:center;gap:30px;justify-content:space-between;padding:16px 22px;background:var(--paper);position:sticky;top:0;z-index:1}.viewer-toolbar p{font-size:13px;line-height:1.6;max-width:850px}.viewer-toolbar button{border:1px solid #b9c6b7;padding:9px 13px;white-space:nowrap;background:transparent;color:var(--ink);border-radius:6px;font-size:12px;min-height:42px}.viewer-toolbar button span{font-size:18px;margin-left:12px}#viewer-image{width:100%;height:auto}
.case-capture{margin-top:25px}.case-capture figcaption{font-size:11px;color:var(--muted);line-height:1.7;margin-top:12px}.case-capture .screen-link{border-width:6px;border-radius:12px}
@media(min-width:1450px){.toi-hero-grid{gap:70px}#toi-top{padding-top:78px}.toi-lead{font-size:17px}.hero-screen{margin-right:-10px}}
@media(max-width:1080px){.header-hn{display:none}.header-inner{gap:30px}.toi-hero-grid{gap:35px;grid-template-columns:.9fr 1.1fr}h1{font-size:57px}.hero-figure figcaption .zoom-hint{margin-left:0}#toi-pedagogy{gap:0 45px}.toi-design-row{gap:45px}.app-section,.research-section{margin-inline:24px;padding-inline:35px}.toi-story-grid{gap:50px}.weekly-feature{gap:32px}.toi-journey-step{grid-template-columns:25px 1.3fr 1fr;gap:20px}.toi-flow{gap:10px;padding:23px}.app-intro{gap:40px}.toi-case-grid{gap:30px}}
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@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}
@media print{.site-header,.toi-actions,.skip-link,.header-hn,#screenshot-viewer{display:none}.toi-section{padding:30px 0;max-width:none}.research-section{background:white;color:black}.research-section *{color:black!important}a{color:black}.screen-link{box-shadow:none}details{break-inside:avoid}body{background:white}}

/* Language switch and Japanese typography. */
.header-inner{gap:24px}
.language-switch{display:flex;align-items:center;flex-shrink:0;gap:3px;padding:3px;border:1px solid var(--line);border-radius:7px;font-size:12px;line-height:1.4}
.language-switch a{display:flex;align-items:center;justify-content:center;min-height:34px;padding:7px 10px;border-radius:4px;text-decoration:none;white-space:nowrap}
.language-switch a[aria-current=page]{background:var(--teal);color:white}
.language-switch a:not([aria-current]):hover{background:var(--mint)}
html[lang=ja]{font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;line-break:strict}
html[lang=ja] :is(h1,h2,.toi-case>summary,.toi-reason h3,.toi-design-row h3,.toi-context-grid h3,.weekly-feature h3,.toi-current h3,.toi-measure p){font-family:"Hiragino Mincho ProN","Yu Mincho",YuMincho,serif;letter-spacing:.015em;font-weight:500;line-height:1.55}
html[lang=ja] h1{font-size:clamp(36px,3.5vw,51px);line-height:1.55}
html[lang=ja] h1 em{font-size:1em}
html[lang=ja] :is(h1,h2) em{font-style:normal}
html[lang=ja] h2{font-size:clamp(28px,3vw,40px)}
html[lang=ja] .section-label{font-family:inherit;letter-spacing:.09em;line-height:1.8;text-transform:none}
html[lang=ja] .toi-stage-label{letter-spacing:.04em}
html[lang=ja] :is(.toi-lead,.toi-thesis,.toi-message p:not(.toi-message-label),.toi-research-body){line-height:2}
html[lang=ja] .toi-research-item>summary{line-height:1.8}
html[lang=ja] .toi-case>summary{font-size:22px}
html[lang=ja] .toi-reason h3{font-size:20px}
html[lang=ja] .toi-flow{grid-template-columns:.7fr auto 1.1fr auto 1.2fr auto 1.2fr}
@media(max-width:1200px){.header-hn{display:none}}
@media(max-width:900px){.header-inner{flex-wrap:wrap;gap:12px 20px}.header-inner nav{order:3;flex-basis:100%;justify-content:center}.language-switch{margin-left:auto}.header-inner .brand{margin-right:auto}:root{scroll-padding-top:150px}}
@media(max-width:780px){:root{scroll-padding-top:30px}.header-inner nav{justify-content:space-between}.language-switch{font-size:11px}.language-switch a{min-height:34px;padding:7px 9px}html[lang=ja] h1{font-size:clamp(36px,6vw,49px)}html[lang=ja] h1 br:first-of-type{display:initial}html[lang=ja] h2{font-size:32px}}
@media(max-width:500px){.header-inner{gap:12px 10px;padding-inline:22px}.language-switch a{padding:7px 8px}.header-inner nav{gap:6px 12px}html[lang=ja] h1{font-size:clamp(27px,8.5vw,39px)}html[lang=ja] h2{font-size:28px}html[lang=ja] .toi-case>summary{font-size:19px}html[lang=ja] .toi-design-row h3{font-size:23px}html[lang=ja] .toi-flow{grid-template-columns:1fr}}
@media print{.language-switch{display:none}}

/* The rewrite of 2026-11-12: the problem before the conversation, two short asides, the three steps. */
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.toi-problem .toi-message-label{color:var(--teal);letter-spacing:.06em;text-transform:uppercase}
.toi-problem p:not(.toi-message-label){font-size:15px;line-height:1.75}
.toi-problem em{font-style:normal;border-bottom:1px solid #a9bda6}
html[lang=ja] .toi-problem .toi-message-label{text-transform:none;letter-spacing:.04em}
html[lang=ja] .toi-problem p:not(.toi-message-label){line-height:2}
.toi-problem+.toi-gap,.toi-message+.toi-gap{font-size:12.5px}
#toi-example{padding-top:70px}
.toi-case-body{padding-top:10px}
.toi-journey{margin-top:0}.toi-journey-step:first-child{border-top:0;padding-top:10px}
.toi-reason p+p{margin-top:11px}
.toi-also{display:grid;grid-template-columns:1fr 1fr;gap:50px;margin-top:55px}
.toi-also article{border-top:2px solid #c8d9be;padding-top:23px}
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.toi-also article>p{font-size:14px;line-height:1.85;color:var(--muted);margin-top:18px}
#toi-loop h2{max-width:900px}
#toi-loop .toi-context-grid{margin-top:45px}
.toi-research-more{font-size:13px;line-height:1.9;color:#b6cbbd;margin-top:26px;max-width:900px}
.toi-research-more a{color:#d3e7ac}
.toi-research-body strong{color:#f3f4e9;font-weight:600}
.toi-measure p{font-size:20px;line-height:1.6}
html[lang=ja] .toi-also h3{font-size:22px}
@media(max-width:780px){.toi-also{grid-template-columns:1fr;gap:34px;margin-top:40px}.toi-measure p{font-size:18px}}