:root {
  --canvas: #faf9f7;
  --surface: #ffffff;
  --ink: #20242a;
  --text: #4a5563;
  --muted: #77808c;
  --line: #d9d4ce;
  --soft-fill: #f1efec;
  --accent: #e45b1b;
  --accent-dark: #a83e17;
  --navy: #315f7d;
  --sage: #56705f;
  --plum: #7b6c79;
  --gold: #c99a2e;
  --risk: #a43e3e;
  --max: 1200px;
  --gutter: clamp(20px, 4vw, 64px);
  --sans: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", YuGothic, system-ui, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; overflow-x: hidden; color: var(--text); background: var(--canvas); font-family: var(--sans); font-size: 1.125rem; line-height: 1.75; -webkit-font-smoothing: antialiased; }
body, button { font: inherit; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
h1, h2, h3, p, ol, dl, dd { margin: 0; }
ol { padding: 0; list-style: none; }
button { color: inherit; }
::selection { color: #fff; background: var(--accent); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 100; padding: 10px 14px; color: #fff; background: var(--ink); transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.js [data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .55s ease, transform .55s ease; }
.js [data-reveal].is-visible { opacity: 1; transform: none; }
.site-header { position: sticky; top: 0; z-index: 30; display: grid; grid-template-columns: 1fr auto auto; min-height: 76px; align-items: center; gap: 34px; padding: 0 max(var(--gutter), calc((100vw - var(--max)) / 2)); background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); }
.site-logo { width: 146px; height: 44px; overflow: hidden; }
.site-logo img { width: 146px; height: 44px; object-fit: cover; }
.site-nav { display: flex; gap: 28px; color: var(--ink); font-size: 1rem; font-weight: 650; }
.site-nav a { position: relative; padding: 21px 0 19px; }
.site-nav a::after { content: ""; position: absolute; right: 0; bottom: 19px; left: 0; height: 2px; background: var(--accent); transform: scaleX(0); transform-origin: right; transition: transform .2s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after, .site-nav a.is-active::after { transform: scaleX(1); transform-origin: left; }
.header-cta { display: inline-flex; min-height: 44px; align-items: center; justify-content: space-between; gap: 20px; padding: 0 16px; color: #fff; background: var(--ink); font-size: 1rem; font-weight: 700; }
.header-cta:hover { background: var(--accent-dark); }
.menu-toggle { display: none; width: 44px; height: 44px; padding: 0; background: transparent; border: 1px solid var(--line); }
.menu-toggle span { display: block; width: 22px; height: 2px; margin: 6px auto; background: var(--ink); }
.hero { padding: clamp(88px, 10vw, 144px) var(--gutter) 0; }
.hero-inner, .hero-baseline, .section-heading, .problem-grid, .control-rail, .control-principles, .inline-route, .customer-boundary, .future-loop, .rl-loop, .learning-principles, .economics-grid, .economics-metrics, .enterprise-grid, .technology-routes, .closing-inner, .footer-main, .footer-meta { width: min(100%, var(--max)); margin-inline: auto; }
.hero-inner { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(380px, .72fr); gap: clamp(56px, 8vw, 112px); align-items: end; }
.status-label { width: fit-content; color: var(--muted); font: 700 .875rem/1.4 var(--mono); letter-spacing: .02em; }
.status-current { color: var(--accent-dark); }
.status-capability { color: var(--navy); }
.status-current::before, .status-approved::before, .status-future::before, .status-stays::before, .status-on-dark::before { content: ""; display: inline-block; width: 28px; height: 2px; margin: 0 10px 3px 0; background: currentColor; }
.status-capability::before { content: ""; display: inline-block; width: 28px; height: 2px; margin: 0 10px 3px 0; background: currentColor; }
.status-future { color: var(--navy); }
.status-future::before { height: 0; border-top: 2px dashed currentColor; background: none; }
.status-approved { color: var(--sage); }
.status-stays { color: var(--ink); }
.status-on-dark { color: #fff; }
h1 { max-width: 820px; margin-top: 30px; color: var(--ink); font-size: clamp(3.4rem, 6.7vw, 6.55rem); font-weight: 680; letter-spacing: -.07em; line-height: 1.04; }
.hero-lead { max-width: 760px; margin-top: 38px; color: var(--text); font-size: clamp(17px, 1.45vw, 21px); line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 28px; margin-top: 44px; }
.button { display: inline-flex; min-height: 56px; align-items: center; justify-content: space-between; gap: 44px; padding: 0 20px; font-weight: 700; }
.button-primary { color: #fff; background: var(--accent); }
.button-primary:hover { background: var(--accent-dark); }
.text-link { padding: 10px 0 7px; color: var(--ink); border-bottom: 1px solid var(--ink); font-size: 1rem; font-weight: 650; }
.hero-control { background: var(--surface); border: 1px solid var(--ink); }
.diagram-key { display: flex; min-height: 46px; align-items: center; gap: 12px; padding: 0 18px; border-bottom: 1px solid var(--line); font: 650 .875rem/1.5 var(--mono); }
.line-solid { width: 38px; height: 2px; background: var(--accent); }
.compact-flow li { display: grid; grid-template-columns: 46px 1fr; min-height: 108px; align-items: center; border-bottom: 1px solid var(--line); }
.compact-flow li > span { display: grid; height: 100%; place-items: center; color: var(--accent-dark); border-right: 1px solid var(--line); font: 700 .875rem/1.5 var(--mono); }
.compact-flow li > div { padding: 17px 20px; }
.compact-flow small { color: var(--muted); font: 700 .875rem/1.5 var(--mono); }
.compact-flow strong { display: block; margin-top: 3px; color: var(--ink); font-size: 21px; }
.compact-flow p { margin-top: 4px; color: var(--muted); font-size: 1rem; line-height: 1.55; }
.compact-flow .approval-step { background: #f3f5f1; border-left: 5px solid var(--sage); }
.compact-flow .approval-step > span { color: var(--sage); }
.capability-stack li { display: grid; grid-template-columns: 46px 1fr auto; min-height: 76px; align-items: center; border-bottom: 1px solid var(--line); }
.capability-matrix .matrix-future { border-left: 3px dashed var(--navy); }
.capability-stack li > span { display: grid; height: 100%; place-items: center; color: var(--navy); border-right: 1px solid var(--line); font: 700 .875rem/1.5 var(--mono); }
.capability-stack li > div { padding: 12px 16px; }
.capability-stack small { display: block; color: var(--muted); font: 700 .875rem/1.5 var(--mono); }
.capability-stack strong { display: block; margin-top: 2px; color: var(--ink); font-size: 1.125rem; }
.capability-stack li > b { margin-right: 16px; padding: 5px 7px; color: var(--navy); border: 1px solid var(--navy); font: 700 .875rem/1.5 var(--mono); white-space: nowrap; }
.capability-stack .layer-agent { background: #fff7f2; border-left: 5px solid var(--accent); }
.capability-stack .layer-agent > span, .capability-stack .layer-agent > b { color: var(--accent-dark); }
.capability-stack .layer-agent > b { border-color: var(--accent); }
.hero-rule { padding: 20px; color: #fff; background: var(--ink); }
.hero-rule span { display: block; color: #bfc5c8; font: 700 .875rem/1.5 var(--mono); text-transform: uppercase; }
.hero-rule strong { display: block; margin-top: 6px; font-size: 1.125rem; }
.hero-baseline { display: grid; grid-template-columns: .8fr .55fr 1.4fr; margin-top: 76px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.hero-baseline p { min-height: 82px; padding: 19px 22px; border-right: 1px solid var(--line); font-size: 1rem; }
.hero-baseline p:last-child { border-right: 0; }
.hero-baseline b { display: block; color: var(--muted); font: 700 .875rem/1.5 var(--mono); }
.section { padding: clamp(96px, 11vw, 152px) var(--gutter); }
.section-heading { display: grid; grid-template-columns: 170px 1fr; column-gap: 40px; }
.section-number { padding-top: 12px; color: var(--accent-dark); font: 700 .875rem/1.5 var(--mono); }
.section-heading h2 { grid-column: 2; max-width: 930px; color: var(--ink); font-size: clamp(2.55rem, 5vw, 4.8rem); font-weight: 680; letter-spacing: -.065em; line-height: 1.13; }
.section-intro { grid-column: 2; max-width: 760px; margin-top: 28px; font-size: 18px; line-height: 1.9; }
.problem { background: var(--surface); }
.stack-section { background: var(--canvas); }
.stack-map { display: grid; grid-template-columns: 170px minmax(0, 1fr) 170px; margin-top: 80px; border: 1px solid var(--ink); background: var(--surface); }
.five-layer-flow { border-right: 1px solid var(--line); border-left: 1px solid var(--line); }
.five-layer-flow li { display: grid; grid-template-columns: 54px minmax(0, 1fr) 90px; min-height: 116px; align-items: center; border-bottom: 1px solid var(--line); }
.five-layer-flow li:last-child { border-bottom: 0; }
.five-layer-flow li > span { display: grid; height: 100%; place-items: center; color: var(--navy); border-right: 1px solid var(--line); font: 700 .875rem/1.5 var(--mono); }
.five-layer-flow li > div { padding: 18px 22px; }
.five-layer-flow small { color: var(--muted); font: 700 .875rem/1.5 var(--mono); }
.five-layer-flow h3 { margin: 3px 0 5px; color: var(--ink); font-size: 22px; }
.five-layer-flow p { font-size: 1rem; line-height: 1.6; }
.five-layer-flow li > b { margin-right: 18px; color: var(--navy); font: 700 .875rem/1.5 var(--mono); text-align: right; }
.five-layer-flow .is-agent { background: #fff7f2; border-left: 5px solid var(--accent); }
.five-layer-flow .is-agent > span, .five-layer-flow .is-agent > b { color: var(--accent-dark); }
.stack-direction { display: flex; min-height: 100%; align-items: center; justify-content: center; flex-direction: column; padding: 24px; text-align: center; }
.stack-direction span { color: var(--muted); font: 700 .875rem/1.5 var(--mono); }
.stack-direction strong { margin: 20px 0; color: var(--navy); font-size: 46px; line-height: 1; }
.stack-direction p { font-size: 1rem; line-height: 1.7; }
.direction-down { background: var(--soft-fill); }
.direction-up { background: #edf2f5; }
.stack-thesis { display: grid; grid-template-columns: 1fr 1fr; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.stack-thesis p { padding: 24px; border-right: 1px solid var(--line); }
.stack-thesis p:last-child { border-right: 0; }
.stack-thesis strong { display: block; margin-bottom: 8px; color: var(--accent-dark); font: 700 .875rem/1.5 var(--mono); }
.problem-grid { display: grid; grid-template-columns: 170px minmax(300px, .78fr) minmax(440px, 1.22fr); gap: 40px; margin-top: 76px; }
.problem-lead { grid-column: 2; color: var(--ink); font-size: clamp(21px, 2.2vw, 31px); font-weight: 620; line-height: 1.55; }
.comparison-list { grid-column: 3; border-top: 1px solid var(--ink); }
.comparison-list > div { display: grid; grid-template-columns: 150px 1fr; gap: 28px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.comparison-list dt { color: var(--ink); font-weight: 750; }
.comparison-list dd { color: var(--text); }
.control-section { background: var(--canvas); }
.control-rail { display: grid; grid-template-columns: repeat(6, 1fr); margin-top: 80px; border-top: 2px solid var(--accent); border-left: 1px solid var(--line); }
.control-rail li { position: relative; min-height: 250px; padding: 20px; background: var(--surface); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.control-rail li:not(:last-child)::after { content: "→"; position: absolute; top: 49%; right: -12px; z-index: 2; display: grid; width: 24px; height: 24px; place-items: center; color: var(--accent); background: var(--surface); font: 700 14px var(--mono); }
.control-rail span { color: var(--accent-dark); font: 700 .875rem/1.5 var(--mono); }
.control-rail small { display: block; margin-top: 54px; color: var(--muted); font: 700 .875rem/1.5 var(--mono); }
.control-rail strong { display: block; margin-top: 9px; color: var(--ink); font-size: 22px; }
.control-rail p { margin-top: 14px; color: var(--text); font-size: 1rem; line-height: 1.6; }
.control-rail .approval { background: #eef1ec; border-top: 5px solid var(--sage); }
.control-rail .approval span, .control-rail .approval small { color: var(--sage); }
.control-principles { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 1px solid var(--ink); }
.control-principles p { padding: 23px; border-right: 1px solid var(--line); }
.control-principles p:last-child { border-right: 0; }
.control-principles span { margin-right: 12px; color: var(--sage); font: 700 .875rem/1.5 var(--mono); }
.control-principles strong { display: block; margin: 8px 0 5px; color: var(--ink); }
.inline-route { display: flex; justify-content: space-between; margin-top: 36px; padding: 18px 0; color: var(--ink); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); font-weight: 700; }
.boundary-section { background: var(--soft-fill); }
.customer-boundary { margin-top: 80px; padding: 14px; border: 2px solid var(--ink); }
.boundary-caption { display: flex; flex-wrap: wrap; gap: 10px 24px; justify-content: space-between; padding: 12px 10px 22px; color: var(--ink); }
.boundary-caption span { color: var(--accent-dark); font: 700 .875rem/1.5 var(--mono); text-transform: uppercase; }
.data-lanes { display: grid; grid-template-columns: 1.1fr 1fr 1fr; background: var(--surface); border-top: 1px solid var(--ink); border-left: 1px solid var(--line); }
.data-lanes article { position: relative; min-height: 360px; padding: 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.data-lanes h3 { margin-top: 80px; color: var(--ink); font-size: 28px; line-height: 1.35; }
.data-lanes article > p:not(.status-label) { margin-top: 20px; font-size: 1rem; }
.data-lanes article > strong { display: block; margin-top: 34px; padding-top: 18px; color: var(--ink); border-top: 1px solid var(--line); font-size: 1rem; }
.data-stays { background: var(--surface); border-top: 5px solid var(--ink); }
.data-permissioned { background: #f3f5f1; border-top: 5px solid var(--sage); }
.data-telemetry { background: #edf2f5; border-top: 0; border-top: 5px dashed var(--navy); }
.boundary-rule { padding: 20px 24px; color: var(--text); background: #fbf6e9; border: 1px solid var(--gold); border-top: 0; font-size: 1rem; }
.boundary-rule strong { margin-right: 8px; color: #745716; }
.learning-section { background: var(--surface); }
.rl-loop { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); margin-top: 80px; border-top: 2px solid var(--accent); border-left: 1px solid var(--line); }
.rl-loop li { position: relative; min-height: 260px; padding: 22px 18px; background: var(--surface); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.rl-loop li:not(:last-child)::after { content: "→"; position: absolute; top: 48%; right: -12px; z-index: 2; display: grid; width: 24px; height: 24px; place-items: center; color: var(--accent); background: var(--surface); font: 700 14px var(--mono); }
.rl-loop span { color: var(--accent-dark); font: 700 .875rem/1.5 var(--mono); }
.rl-loop small { display: block; margin-top: 48px; color: var(--muted); font: 700 .875rem/1.5 var(--mono); }
.rl-loop strong { display: block; margin-top: 8px; color: var(--ink); font-size: 20px; }
.rl-loop p { margin-top: 12px; color: var(--text); font-size: 1rem; line-height: 1.6; }
.rl-loop .on-prem-step { background: #f7fafc; border-top: 5px solid var(--navy); }
.rl-loop .on-prem-step span, .rl-loop .on-prem-step small { color: var(--navy); }
.rl-loop .approval-step { background: #f3f5f1; border-top: 5px solid var(--sage); }
.rl-loop .approval-step span, .rl-loop .approval-step small { color: var(--sage); }
.learning-principles { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--ink); }
.learning-principles p { padding: 24px; border-right: 1px solid var(--line); font-size: 1rem; }
.learning-principles p:last-child { border-right: 0; }
.learning-principles strong { display: block; margin-bottom: 8px; color: var(--ink); font-size: 1.125rem; }
.economics-section { color: #fff; background: var(--ink); }
.economics-section .section-number { color: #f4a07b; }
.economics-section .section-heading h2 { color: #fff; }
.economics-section .section-intro { color: #c3c8cc; }
.economics-grid { display: grid; grid-template-columns: 1fr 1fr; margin-top: 80px; border: 1px solid #53585e; }
.economics-grid article { min-height: 340px; padding: 32px; }
.economics-grid article + article { border-left: 1px solid #53585e; }
.economics-grid h3 { max-width: 470px; margin-top: 72px; color: #fff; font-size: clamp(1.6rem, 2.7vw, 2.6rem); line-height: 1.35; }
.economics-grid article > p:not(.status-label) { margin-top: 22px; color: #c3c8cc; font-size: 1rem; }
.economics-grid .gpu-path { border-top: 5px solid var(--accent); }
.economics-grid .silicon-path { border-top: 5px solid var(--navy); background: #252c32; }
.economics-metrics { display: grid; grid-template-columns: repeat(4, 1fr); border-right: 1px solid #53585e; border-bottom: 1px solid #53585e; border-left: 1px solid #53585e; }
.economics-metrics div { min-height: 108px; padding: 20px; border-right: 1px solid #53585e; }
.economics-metrics div:last-child { border-right: 0; }
.economics-metrics dt { color: #9ea5aa; font: 700 .875rem/1.5 var(--mono); }
.economics-metrics dd { margin-top: 8px; color: #fff; font-size: 1rem; font-weight: 700; }
.future-section { background: var(--canvas); }
.future-loop { display: grid; grid-template-columns: .7fr 1.3fr; margin-top: 80px; border: 1px solid var(--ink); background: var(--surface); }
.current-source { padding: 30px; border-top: 5px solid var(--accent); border-right: 1px solid var(--ink); }
.current-source h3, .future-branches h3 { margin-top: 72px; color: var(--ink); font-size: 28px; line-height: 1.4; }
.current-source > p:last-child, .future-branches article > p:not(.status-label) { margin-top: 20px; font-size: 1rem; }
.future-branches { display: grid; grid-template-columns: 1fr 1fr; }
.future-branches article { padding: 30px; border-top: 5px dashed var(--navy); border-right: 1px dashed var(--navy); }
.future-branches article:last-child { border-right: 0; }
.future-branches h3 { margin-top: 52px; font-size: 23px; }
.future-branches a { display: flex; justify-content: space-between; margin-top: 30px; padding-top: 16px; color: var(--navy); border-top: 1px dashed var(--navy); font-weight: 700; }
.future-condition { grid-column: 1 / -1; padding: 22px 28px; color: var(--text); background: #fbf6e9; border-top: 1px solid var(--gold); font-size: 1rem; }
.future-condition span { margin-right: 16px; color: #745716; font: 700 .875rem/1.5 var(--mono); }
.capability-state-section { background: var(--soft-fill); }
.capability-matrix { margin-top: 76px; border: 1px solid var(--ink); background: var(--surface); }
.matrix-head, .capability-matrix article { display: grid; grid-template-columns: 1fr 1.35fr .9fr; align-items: center; }
.matrix-head { min-height: 52px; color: #d4d5d1; background: var(--ink); font: 700 .875rem/1.5 var(--mono); }
.matrix-head span, .capability-matrix article > * { padding: 0 22px; }
.capability-matrix article { min-height: 112px; border-bottom: 1px solid var(--line); }
.capability-matrix article h3 { color: var(--ink); font-size: 20px; }
.capability-matrix article p { border-right: 1px solid var(--line); border-left: 1px solid var(--line); font-size: 1rem; }
.capability-matrix article b { color: var(--navy); font-size: .875rem; }
.capability-matrix .matrix-current { border-left: 5px solid var(--accent); background: #fff7f2; }
.capability-matrix .matrix-current b { color: var(--accent-dark); }
.enterprise-section { color: #fff; background: var(--ink); }
.enterprise-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(56px, 8vw, 112px); }
.enterprise-copy h2 { margin-top: 34px; color: #fff; font-size: clamp(2.55rem, 4.8vw, 4.6rem); font-weight: 680; letter-spacing: -.06em; line-height: 1.15; }
.enterprise-copy > p:last-child { margin-top: 34px; color: #c3c8cc; font-size: 18px; }
.enterprise-section .section-number { color: #f4a07b; }
.responsibility-ladder { border-top: 1px solid #fff; }
.responsibility-ladder li { display: grid; grid-template-columns: 46px 1fr 90px; min-height: 120px; align-items: center; gap: 18px; border-bottom: 1px solid #53585e; }
.responsibility-ladder li > span { color: #f4a07b; font: 700 .875rem/1.5 var(--mono); }
.responsibility-ladder strong { color: #fff; font-size: 19px; }
.responsibility-ladder p { margin-top: 4px; color: #aeb5ba; font-size: 1rem; }
.responsibility-ladder small { color: #aeb5ba; font: 700 .875rem/1.5 var(--mono); text-align: right; }
.technology-section { background: var(--surface); }
.technology-routes { display: grid; grid-template-columns: 1.15fr 1fr 1fr; margin-top: 76px; border-top: 1px solid var(--ink); border-left: 1px solid var(--line); }
.technology-routes > a { position: relative; min-height: 330px; padding: 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.technology-routes > a > span { position: absolute; top: 24px; right: 24px; color: var(--accent-dark); font: 700 .875rem/1.5 var(--mono); }
.technology-routes h3 { margin-top: 88px; color: var(--ink); font-size: 28px; line-height: 1.4; }
.technology-routes > a > p:not(.status-label) { margin-top: 18px; }
.technology-routes b { position: absolute; right: 26px; bottom: 26px; left: 26px; display: flex; justify-content: flex-end; padding-top: 14px; color: var(--ink); border-top: 1px solid var(--line); }
.route-current { border-top: 5px solid var(--accent); background: var(--canvas); }
.route-future { border-top: 5px dashed var(--navy); }
.route-capability { border-top: 5px solid var(--navy); background: #f7fafc; }
.technology-routes.five-routes { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.five-routes > a { min-height: 380px; padding: 20px 20px 88px; }
.five-routes .status-label { max-width: calc(100% - 28px); min-height: 2.8em; }
.five-routes h3 { margin-top: 40px; font-size: 21px; }
.five-routes > a > p:not(.status-label) { font-size: 1rem; }
.closing { padding: clamp(100px, 12vw, 170px) var(--gutter); color: #fff; background: var(--accent-dark); }
.closing-inner { display: grid; grid-template-columns: 1fr; align-items: end; gap: 48px; }
.closing h2 { grid-column: 1; margin-top: 28px; color: #fff; font-size: clamp(3rem, 6vw, 6rem); font-weight: 680; letter-spacing: -.065em; line-height: 1.08; }
.closing p:not(.status-label) { grid-column: 1; max-width: 760px; margin-top: 28px; font-size: 18px; }
.button-light { grid-column: 2; grid-row: 2 / span 2; color: var(--ink); background: #fff; }
.button-light:hover { background: var(--soft-fill); }
.site-footer { padding: 0 var(--gutter); color: #fff; background: var(--ink); }
.footer-main { display: grid; grid-template-columns: 1.05fr 1.2fr; gap: clamp(42px, 6vw, 92px); padding-top: 72px; padding-bottom: 64px; }
.footer-logo { width: 146px; height: 44px; overflow: hidden; }
.footer-logo img { width: 146px; height: 44px; object-fit: cover; }
.footer-brand > p { max-width: 420px; color: #c3c8cc; font-size: 1rem; line-height: 1.75; }
.footer-brand .footer-statement { margin: 42px 0 12px; color: #fff; font-size: clamp(1.35rem, 2vw, 1.8rem); font-weight: 700; line-height: 1.4; }
.footer-brand .footer-stack { margin-top: 22px; color: #f4a07b; font: 700 .875rem/1.5 var(--mono); letter-spacing: .08em; }
.footer-pillars { display: grid; align-content: start; }
.footer-pillars > p { margin: 0 0 22px; color: #9ea5aa; font: 700 .875rem/1.5 var(--mono); letter-spacing: .08em; }
.footer-pillars a { display: grid; grid-template-columns: 1fr auto; gap: 8px 18px; padding: 17px 0; border-top: 1px solid #53585e; color: #fff; text-decoration: none; }
.footer-pillars a:last-child { border-bottom: 1px solid #53585e; }
.footer-pillars a::after { content: "→"; grid-column: 2; grid-row: 1 / span 2; align-self: center; color: #9ea5aa; }
.footer-pillars a:hover, .footer-pillars a.is-current { border-top-color: var(--accent); }
.footer-pillars a.is-current::after, .footer-pillars a:hover::after { color: #f4a07b; }
.footer-pillars span { color: #9ea5aa; font: 700 .875rem/1.5 var(--mono); letter-spacing: .04em; }
.footer-pillars strong { font-size: 1.125rem; line-height: 1.5; }
.footer-meta { display: flex; min-height: 72px; align-items: center; gap: 24px; border-top: 1px solid #53585e; color: #aeb5ba; font: 500 .875rem/1.5 var(--mono); }
.footer-meta p { margin: 0; }
.footer-meta a { margin-left: auto; color: #aeb5ba; text-decoration: none; }
.footer-meta a:hover { color: #fff; }
@media (max-width: 1040px) {
  .footer-main { grid-template-columns: 1fr; }
  .footer-brand { grid-column: 1 / -1; padding-bottom: 38px; border-bottom: 1px solid #53585e; }
  .footer-brand .footer-statement { margin-top: 30px; }
  .site-header { grid-template-columns: 1fr auto auto; }
  .site-nav { display: none; position: absolute; top: 75px; right: var(--gutter); left: var(--gutter); flex-direction: column; gap: 0; padding: 10px 20px; background: var(--surface); border: 1px solid var(--ink); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 17px 0; border-bottom: 1px solid var(--line); }
  .site-nav a:last-child { border-bottom: 0; }
  .site-nav a::after { display: none; }
  .menu-toggle { display: block; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-control { max-width: 720px; }
  .stack-map { grid-template-columns: 110px minmax(0, 1fr) 110px; }
  .control-rail { grid-template-columns: repeat(3, 1fr); }
  .rl-loop { grid-template-columns: repeat(3, 1fr); }
  .rl-loop li:nth-child(3)::after { display: none; }
  .learning-principles { grid-template-columns: 1fr; }
  .learning-principles p { border-right: 0; border-bottom: 1px solid var(--line); }
  .control-rail li:nth-child(3) { border-right: 0; }
  .control-rail li:nth-child(n+4) { border-top: 1px solid var(--line); }
  .control-rail li:nth-child(3)::after { display: none; }
  .problem-grid { grid-template-columns: 130px 1fr; }
  .problem-lead, .comparison-list { grid-column: 2; }
  .future-loop, .enterprise-grid { grid-template-columns: 1fr; }
  .economics-metrics { grid-template-columns: repeat(2, 1fr); }
  .technology-routes.five-routes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .current-source { border-right: 0; border-bottom: 1px solid var(--ink); }
  .closing-inner { grid-template-columns: 1fr; }
  .button-light { grid-column: 1; grid-row: auto; justify-self: start; margin-top: 18px; }
}
@media (max-width: 760px) {
  body { font-size: 1.125rem; }
  .site-header { min-height: 70px; gap: 12px; }
  .site-logo, .site-logo img { width: 124px; height: 38px; }
  .site-nav { top: 69px; }
  .header-cta { display: none; }
  .hero { padding-top: 72px; }
  h1 { font-size: clamp(3rem, 14vw, 4.6rem); letter-spacing: -.055em; }
  .hero-lead { font-size: 1.125rem; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
  .text-link { width: fit-content; }
  .hero-baseline { grid-template-columns: 1fr; }
  .hero-baseline p { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .hero-baseline p:last-child { border-bottom: 0; }
  .stack-map { grid-template-columns: 1fr; }
  .stack-direction { min-height: 130px; }
  .stack-direction strong { margin: 8px 0; transform: rotate(-90deg); }
  .five-layer-flow { border: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .five-layer-flow li { grid-template-columns: 46px 1fr; }
  .five-layer-flow li > b { grid-column: 2; margin: 0 18px 14px; text-align: left; }
  .stack-thesis { grid-template-columns: 1fr; }
  .stack-thesis p { border-right: 0; border-bottom: 1px solid var(--line); }
  .matrix-head { display: none; }
  .capability-matrix article { grid-template-columns: 1fr; padding: 24px; }
  .capability-matrix article > * { padding: 0; }
  .capability-matrix article p { margin: 10px 0 14px; padding: 10px 0; border-top: 1px solid var(--line); border-right: 0; border-bottom: 1px solid var(--line); border-left: 0; }
  .section-heading { grid-template-columns: 1fr; }
  .section-number, .section-heading h2, .section-intro { grid-column: 1; }
  .section-heading h2 { margin-top: 22px; font-size: clamp(2.35rem, 11vw, 3.7rem); }
  .problem-grid { grid-template-columns: 1fr; gap: 32px; }
  .problem-lead, .comparison-list { grid-column: 1; }
  .comparison-list > div { grid-template-columns: 110px 1fr; }
  .control-rail { grid-template-columns: 1fr; border-top: 0; }
  .rl-loop { grid-template-columns: 1fr; border-top: 0; }
  .rl-loop li { min-height: 180px; border-top: 1px solid var(--line); border-left: 3px solid var(--accent); }
  .rl-loop li:not(:last-child)::after { content: "↓"; top: auto; right: 22px; bottom: -12px; }
  .rl-loop li:nth-child(3)::after { display: grid; }
  .rl-loop small { margin-top: 28px; }
  .control-rail li { min-height: 170px; border-top: 1px solid var(--line); border-left: 3px solid var(--accent); }
  .control-rail li:not(:last-child)::after { content: "↓"; top: auto; right: 22px; bottom: -12px; }
  .control-rail li:nth-child(3)::after { display: grid; }
  .control-rail small { margin-top: 30px; }
  .control-principles { grid-template-columns: 1fr; }
  .control-principles p { border-right: 0; border-bottom: 1px solid var(--line); }
  .data-lanes { grid-template-columns: 1fr; }
  .data-lanes article { min-height: 300px; }
  .data-lanes h3 { margin-top: 54px; }
  .future-branches { grid-template-columns: 1fr; }
  .economics-grid, .economics-metrics { grid-template-columns: 1fr; }
  .economics-grid article + article { border-top: 1px solid #53585e; border-left: 0; }
  .economics-metrics div { border-right: 0; border-bottom: 1px solid #53585e; }
  .future-branches article { border-right: 0; border-bottom: 1px dashed var(--navy); }
  .future-branches article:last-child { border-bottom: 0; }
  .responsibility-ladder li { grid-template-columns: 36px 1fr; padding: 18px 0; }
  .responsibility-ladder small { grid-column: 2; text-align: left; }
  .technology-routes { grid-template-columns: 1fr; }
  .technology-routes.five-routes { grid-template-columns: 1fr; }
  .technology-routes > a { min-height: 290px; }
  .footer-main { grid-template-columns: 1fr; padding-top: 56px; }
  .footer-brand { grid-column: 1; }
  .footer-meta { min-height: 96px; align-items: flex-start; flex-direction: column; gap: 8px; padding: 24px 0; }
  .footer-meta a { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .js [data-reveal] { opacity: 1; transform: none; }
}
/* 2026-09 Refero-informed refinement: warm editorial canvas + precision UI. */
:root {
  --canvas: #f7f5f0;
  --surface: #ffffff;
  --ink: #111211;
  --text: #51565b;
  --muted: #63696f;
  --line: #d7d6d2;
  --soft-fill: #eeece6;
  --accent: #e45b1b;
  --accent-dark: #b84519;
}
body { font-size: 1.125rem; line-height: 1.75; }
.site-header {
  min-height: 68px;
  background: rgba(247, 245, 240, .9);
  border-bottom-color: rgba(17, 18, 17, .12);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.site-nav { color: var(--muted); font-weight: 560; }
.site-nav a:hover, .site-nav a:focus-visible, .site-nav a.is-active { color: var(--ink); }
.site-nav a::after { bottom: 16px; height: 1px; background: var(--ink); }
.header-cta, .button { border-radius: 999px; }
.header-cta { min-height: 40px; padding-inline: 17px; background: var(--ink); font-weight: 600; }
.header-cta:hover, .button-primary:hover { background: #30322f; }
.hero { padding-top: clamp(80px, 9vw, 132px); }
h1, .section-heading h2, .closing h2 { font-weight: 520; letter-spacing: -.055em; }
h1 { max-width: 860px; font-size: clamp(3.45rem, 6.55vw, 6.35rem); line-height: 1.02; }
.hero-lead { max-width: 690px; color: #5b605f; font-size: clamp(1.125rem, 1.4vw, 1.25rem); line-height: 1.8; }
.button { min-height: 52px; padding-inline: 22px; font-weight: 600; }
.button-primary { color: #fff; background: var(--ink); }
.text-link { border-bottom-color: rgba(17, 18, 17, .35); font-weight: 560; }
.hero-control,
.stack-map,
.future-loop,
.capability-matrix,
.customer-boundary,
.control-rail,
.rl-loop {
  overflow: hidden;
  border-color: var(--line);
  border-radius: 18px;
  box-shadow: 0 0 0 1px rgba(17, 18, 17, .025), 0 28px 72px -58px rgba(17, 18, 17, .55);
}
.hero-control, .stack-map { background: #fbfaf7; }
.diagram-key { border-bottom-color: var(--line); letter-spacing: -.015em; }
.capability-stack .layer-agent,
.five-layer-flow .is-agent,
.capability-matrix .matrix-current { background: #fbf1ea; }
.hero-rule { background: #171817; }
.hero-baseline { margin-top: 64px; border-top-color: rgba(17, 18, 17, .35); }
.section { padding-block: clamp(88px, 10vw, 136px); }
.section-number, .status-label { letter-spacing: .06em; }
.section-heading h2 { font-size: clamp(2.55rem, 4.7vw, 4.55rem); line-height: 1.08; }
.section-intro { color: var(--text); font-size: 1.125rem; }
.direction-down { background: #f1efe9; }
.direction-up { background: #eef1f2; }
.problem, .learning-section, .technology-section { background: #fff; }
.control-rail, .rl-loop { border-top-color: var(--accent); border-left-color: var(--line); }
.control-rail li, .rl-loop li { background: #fbfaf7; }
.customer-boundary { padding: 12px; border-width: 1px; background: #f7f5f0; }
.data-lanes { overflow: hidden; border-radius: 12px; }
.economics-section, .enterprise-section, .site-footer { background: #151615; }
.technology-routes {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fbfaf7;
}
.economics-grid article,
.technology-routes > a,
.responsibility-ladder li { transition: background-color .2s ease, border-color .2s ease, transform .2s ease; }
.technology-routes > a:hover, .technology-routes > a:focus-visible { background: #f1efe9; transform: translateY(-2px); }
.closing { position: relative; background: #111211; }
.closing::before {
  content: "";
  position: absolute;
  top: 0;
  right: var(--gutter);
  left: var(--gutter);
  height: 2px;
  background: var(--accent);
}
.button-light { border: 1px solid rgba(255, 255, 255, .3); border-radius: 999px; }
.footer-pillars a { border-top-color: rgba(255, 255, 255, .22); }
@media (max-width: 1040px) {
  .site-nav {
    top: 67px;
    background: rgba(247, 245, 240, .98);
    border-color: var(--line);
    border-radius: 16px;
    box-shadow: 0 24px 60px -42px rgba(17, 18, 17, .6);
  }
}
@media (max-width: 760px) {
  .site-header { min-height: 64px; }
  .hero { padding-top: 64px; }
  h1 { font-size: clamp(2.75rem, 14vw, 4.65rem); letter-spacing: -.06em; }
  .hero-control,
  .stack-map,
  .future-loop,
  .capability-matrix,
  .customer-boundary,
  .control-rail,
  .rl-loop,
  .technology-routes { border-radius: 14px; }
}
/* Japanese composition: preserve phrases and balance headings naturally. */
html { line-break: strict; }
h1, h2, h3, .detail-title {
  word-break: auto-phrase;
  overflow-wrap: anywhere;
  text-wrap: balance;
}
.phrase-broken-title {
  word-break: keep-all;
  overflow-wrap: normal;
}
p, dd, li {
  word-break: auto-phrase;
  overflow-wrap: anywhere;
  text-wrap: pretty;
}
.hero-inner > *,
.detail-hero-grid > *,
.detail-section-head > * {
  min-width: 0;
}

/* Hero diagram: four legible technology layers and one explicit learning loop. */
.hero-control.hero-stack-diagram { align-self: center; overflow: visible; border: 0; border-radius: 0; background: transparent; box-shadow: none; font-family: var(--sans); }
.hero-stack-diagram .diagram-key { min-height: 0; margin-bottom: 24px; padding: 0; border: 0; font: 600 .9375rem/1.6 var(--sans); }
.hero-stack-diagram .line-solid { width: 28px; flex-shrink: 0; }
.hero-stack-flow { position: relative; padding-right: 44px; }
.hero-stack-layers { display: grid; grid-auto-rows: 1fr; gap: 22px; }
.hero-stack-layers li { position: relative; display: flex; min-height: 108px; flex-direction: column; align-items: center; justify-content: center; padding: 16px 12px; color: var(--ink); border: 1px solid var(--line); background: var(--surface); text-align: center; }
.hero-stack-layers strong { font-size: clamp(1.5rem, 2.2vw, 1.75rem); font-weight: 650; letter-spacing: .02em; line-height: 1.4; }
.hero-stack-layers small { margin-top: 9px; color: var(--text); font-size: 1rem; line-height: 1.6; }
.hero-stack-layers li:nth-child(1) { border-color: var(--ink); }
.hero-stack-layers li:nth-child(2) { background: #eeece6; }
.hero-stack-layers li:nth-child(3) { background: #deddd6; }
.hero-stack-layers li:nth-child(4) { color: #fff; border-color: var(--ink); background: var(--ink); }
.hero-stack-layers li:nth-child(4) small { color: #d4d5d1; }
.hero-stack-layers li:not(:first-child)::before { content: ""; position: absolute; top: -19px; left: calc(50% - 1px); width: 2px; height: 14px; background: var(--ink); }
.hero-stack-layers li:not(:first-child)::after { content: ""; position: absolute; top: -19px; left: calc(50% - 4px); width: 8px; height: 8px; border-top: 2px solid var(--ink); border-left: 2px solid var(--ink); transform: rotate(45deg); }
/* Four equal-height rows keep the feedback path centered on system and model. */
.hero-stack-feedback { position: absolute; top: calc((100% - 66px) / 8); right: 12px; width: 32px; height: calc((100% - 66px) / 4 + 22px); border: 2px solid var(--accent); border-left: 0; border-radius: 0 16px 16px 0; }
.hero-stack-feedback::after { content: ""; position: absolute; bottom: -5px; left: 0; width: 8px; height: 8px; border-left: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(45deg); }
.hero-stack-feedback > span { position: absolute; top: 50%; right: -8px; padding: 5px 0; color: var(--accent-dark); background: var(--canvas); font-size: .875rem; line-height: 1.3; letter-spacing: .08em; writing-mode: vertical-rl; white-space: nowrap; transform: translateY(-50%); }
.hero-stack-caption { margin-top: 24px; padding-right: 44px; color: var(--text); font-size: 1rem; line-height: 1.7; text-align: center; }