.title-in { animation: title-in 1s cubic-bezier(.16,1,.3,1) both; }
.cover-title .title-in:first-child { animation-delay: .04s; }
.cover-title .title-in:last-child { animation-delay: .12s; }
@keyframes title-in { from { opacity: 0; transform: translateX(54px); filter: blur(5px); } to { opacity: 1; transform: none; filter: blur(0); } }

.js .reveal { opacity: 0; transform: translateY(22px); transition: opacity .75s ease,transform .75s cubic-bezier(.2,.7,.2,1); }
.js .reveal.is-visible { opacity: 1; transform: none; }

.concept-figure,.concept-canvas,.process-figure,.process-panel,.process-flow li,.chapter-step-nav a,.chapter-end,.chapter-end a) {
  corner-shape: squircle;
}

.page-noise { position: fixed; inset: 0; z-index: 60; pointer-events: none; opacity: .025; background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.84' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E"); }

.site-header,.reader-header { position: fixed; inset: 0 0 auto; z-index: 40; display: flex; align-items: center; justify-content: space-between; min-height: 72px; padding: 0 clamp(20px,4vw,64px); border-bottom: 1px solid rgba(26,31,47,.07); background: rgba(255,255,255,.72); backdrop-filter: blur(24px) saturate(160%); -webkit-backdrop-filter: blur(24px) saturate(160%); }
.site-mark { display: flex; align-items: center; gap: 9px; text-decoration: none; font-size: 13px; font-weight: 750; letter-spacing: .08em; }
.site-mark i { width: 28px; height: 1px; background: currentColor; transform: rotate(-34deg); }
.header-link { padding: 10px 17px; border: 1px solid var(--line); border-radius: 16px; font-size: 14px; font-weight: 650; text-decoration: none; transition: .25s ease; }
.header-link:hover { border-color: rgba(73,103,255,.22); background: rgba(73,103,255,.06); transform: translateY(-1px); }

.book-entry { min-height: 100vh; background: radial-gradient(ellipse at -8% 17%,rgba(138,157,255,.34),transparent 42%),radial-gradient(ellipse at 98% 7%,rgba(182,235,255,.38),transparent 43%),radial-gradient(ellipse at 43% 4%,rgba(216,204,255,.34),transparent 42%),radial-gradient(ellipse at 6% 52%,rgba(255,207,239,.27),transparent 36%),radial-gradient(ellipse at 84% 48%,rgba(217,210,255,.24),transparent 38%),linear-gradient(180deg,#fffaff 0%,#fbfdff 44%,#fff 72%); }
.book-cover { position: relative; min-height: 70svh; overflow: hidden; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 126px 24px 66px; text-align: center; }
.cover-kicker { position: relative; z-index: 2; margin: 0 0 38px; color: #414855; font-size: 13px; font-weight: 650; line-height: 1.55; letter-spacing: .13em; }
.cover-title { position: relative; z-index: 2; }
.cover-ruby { margin: 0 0 20px; color: #303744; font-size: 16px; font-weight: 540; letter-spacing: .11em; }
.cover-title h1 { margin: 0; font: 620 clamp(68px,10vw,150px)/.96 var(--sans); letter-spacing: -.085em; white-space: nowrap; }
.cover-title h1 span { display: inline-block; margin: 0 .05em; color: #414855; font-size: .34em; font-weight: 540; letter-spacing: 0; vertical-align: .47em; }
.mobile-title-break { display: none; }
.cover-bottom { position: relative; z-index: 2; display: flex; align-items: center; justify-content: center; gap: 36px; width: min(760px,100%); margin-top: 44px; color: #303744; }
.cover-bottom p { margin: 0; font-size: 16px; line-height: 1.75; }
.cover-bottom .author { flex: none; color: var(--ink); font-weight: 650; letter-spacing: .08em; white-space: nowrap; }
.scroll-cue { position: absolute; right: 32px; bottom: 22px; z-index: 3; display: flex; flex-direction: column; align-items: center; gap: 10px; color: #3f4653; font-size: 12px; font-weight: 650; letter-spacing: .08em; text-decoration: none; }
.scroll-cue i { width: 1px; height: 32px; background: currentColor; }
.title-in { animation: title-in 1s cubic-bezier(.16,1,.3,1) both; }
.cover-title .title-in:first-child { animation-delay: .04s; }
.cover-title .title-in:last-child { animation-delay: .12s; }
@keyframes title-in { from { opacity: 0; transform: translateX(54px); filter: blur(5px); } to { opacity: 1; transform: none; filter: blur(0); } }

.contents-panel { position: relative; z-index: 4; width: min(1180px,calc(100% - 40px)); margin: 0 auto 70px; padding: clamp(44px,7vw,86px); border: 1px solid rgba(71,91,164,.12); border-radius: 38px; background: rgba(255,255,255,.72); box-shadow: 0 30px 100px rgba(59,83,158,.1),inset 0 1px 0 #fff; backdrop-filter: blur(30px) saturate(150%); -webkit-backdrop-filter: blur(30px) saturate(150%); }
.contents-intro { max-width: 750px; margin-bottom: 56px; }
.eyebrow { margin: 0 0 18px; color: var(--blue); font-size: 13px; font-weight: 720; letter-spacing: .15em; }
.contents-intro h2 { margin: 0 0 25px; font-size: clamp(48px,6vw,82px); font-weight: 590; letter-spacing: -.06em; line-height: 1; }
.contents-intro>p:last-child { max-width: 680px; margin: 0; color: #303744; font-size: 17px; line-height: 1.85; }
.toc-part { margin: 0; padding: clamp(30px,4vw,46px) 0; border-top: 1px solid rgba(29,35,52,.13); }
.toc-part-head { display: grid; grid-template-columns: 118px 1fr; gap: 20px; margin-bottom: 24px; }
.toc-part-head>span { color: var(--blue); font-size: 13px; font-weight: 720; letter-spacing: .1em; padding-top: 3px; }
.toc-part-head h2 { margin: 0; font-size: 16px; font-weight: 650; line-height: 1.65; }
.toc-list { margin-left: 138px; }
.toc-item { display: grid; grid-template-columns: 44px 1fr auto; gap: 14px; align-items: center; min-height: 66px; padding: 14px 4px; border-top: 1px solid rgba(29,35,52,.09); text-decoration: none; }
.toc-number { color: #505866; font-size: 14px; font-variant-numeric: tabular-nums; }
.toc-name { font-size: 16px; font-weight: 540; line-height: 1.55; }
.toc-status { color: #555d6a; font-size: 13px; font-weight: 560; letter-spacing: .06em; white-space: nowrap; }
.toc-action { color: var(--blue); font-size: 14px; font-weight: 700; white-space: nowrap; transition: transform .25s ease; }
.toc-action span { display: inline-block; margin-left: 5px; }
.toc-item--available { color: #1738d4; transition: transform .25s ease,color .25s ease; }
.toc-item--available:hover,.toc-item--available:focus-visible { color: var(--blue); transform: translateX(5px); outline: none; }
.toc-item--available:hover .toc-action,.toc-item--available:focus-visible .toc-action { transform: translateX(3px); }
.toc-item--future { color: #252b35; }
.book-footer { display: flex; justify-content: space-between; gap: 20px; padding: 42px 8px 0; border-top: 1px solid rgba(29,35,52,.13); color: #424a57; font-size: 13px; font-weight: 560; letter-spacing: .08em; }

.js .reveal { opacity: 0; transform: translateY(22px); transition: opacity .75s ease,transform .75s cubic-bezier(.2,.7,.2,1); }
.js .reveal.is-visible { opacity: 1; transform: none; }

.reading-progress { position: fixed; inset: 0 0 auto; height: 3px; z-index: 60; background: rgba(73,103,255,.08); }
.reading-progress span { display: block; width: 100%; height: 100%; background: linear-gradient(90deg,var(--blue),var(--violet),var(--cyan)); transform: scaleX(0); transform-origin: left center; }
.reader-header { top: 3px; display: grid; grid-template-columns: 1fr auto 1fr; min-height: 66px; }
.reader-header a { text-decoration: none; }
.reader-book { font-size: 15px; font-weight: 680; letter-spacing: .04em; }
.reader-contents { padding: 9px 15px; border: 1px solid var(--line); border-radius: 15px; font-size: 14px; font-weight: 650; }
.reader-position { justify-self: end; color: var(--muted); font-size: 14px; font-variant-numeric: tabular-nums; }
.reader-main { padding-top: 69px; background: #fff; }
.reader-main article { margin: 0; }
.chapter-hero { position: relative; min-height: calc(94svh - 69px); overflow: hidden; display: grid; grid-template-rows: auto 1fr auto; align-items: center; padding: clamp(54px,8vw,108px) max(28px,calc((100vw - 1120px)/2)) 54px; background: radial-gradient(ellipse at -6% 10%,rgba(154,169,255,.3),transparent 42%),radial-gradient(ellipse at 100% 4%,rgba(190,236,255,.36),transparent 43%),radial-gradient(ellipse at 52% 14%,rgba(224,211,255,.3),transparent 42%),radial-gradient(ellipse at 13% 82%,rgba(255,215,239,.2),transparent 36%),linear-gradient(155deg,#fffaff,#fbfdff 54%,#fff); color: var(--ink); }
.chapter-label { position: relative; z-index: 2; display: flex; justify-content: space-between; margin: 0; color: #333a46; font-size: 13px; font-weight: 700; letter-spacing: .12em; }
.chapter-title { position: relative; z-index: 2; max-width: 1080px; margin: auto 0; padding: 8vh 0; font: 600 clamp(48px,7vw,100px)/1.18 var(--sans); letter-spacing: -.07em; text-wrap: balance; }
.chapter-title--long { max-width: 1180px; font-size: clamp(42px,5.8vw,82px); line-height: 1.25; }
.chapter-title-keep { white-space: nowrap; }
.chapter-title-sub { display: block; margin-top: .34em; color: #343b48; font-size: .38em; font-weight: 540; letter-spacing: -.02em; }
.chapter-lead { position: relative; z-index: 2; max-width: 620px; margin: 0; color: #303744; font-size: 17px; font-weight: 500; line-height: 1.85; }
.chapter-scroll { position: absolute; left: 28px; bottom: 36px; display: flex; align-items: center; gap: 12px; color: #4e5664; font-size: 11px; font-weight: 650; letter-spacing: .1em; transform: rotate(-90deg); transform-origin: left center; }
.chapter-scroll span { width: 38px; height: 1px; background: currentColor; }
.article-body { max-width: 800px; margin: 0 auto; padding: 124px 28px 60px; color: #222731; font-size: 18px; line-height: 2.04; }
.article-body h2 { margin: 118px 0 42px; font-size: clamp(29px,3.7vw,43px); font-weight: 640; line-height: 1.48; letter-spacing: -.04em; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { margin: 64px 0 26px; font-size: clamp(22px,2.7vw,30px); font-weight: 640; line-height: 1.5; letter-spacing: -.025em; }
.prose-group { margin-bottom: 40px; }
.prose-group p { margin: 0 0 .72em; }
.article-body strong { font-weight: 700; }
.article-body blockquote { margin: 58px 0; padding: 8px 0 8px 26px; border-left: 3px solid #8fa2ff; color: #303846; font-size: clamp(20px,2.5vw,27px); font-weight: 580; line-height: 1.8; }
.article-body ul { margin: 30px 0 44px; padding-left: 1.2em; }
.article-body li { margin: .55em 0; padding-left: .3em; }
.article-body hr { width: 92px; margin: 94px 0; border: 0; border-top: 2px solid #dce2ff; }

.concept-figure { position: relative; width: min(1060px,calc(100vw - 40px)); overflow: hidden; margin: 92px 50% 112px; padding: clamp(30px,5vw,56px); border: 1px solid rgba(73,92,157,.1); border-radius: 38px; background: linear-gradient(145deg,rgba(252,249,255,.98),rgba(241,248,255,.96) 58%,#fff); box-shadow: 0 30px 90px rgba(61,76,128,.11),inset 0 1px #fff; color: var(--ink); font-family: var(--sans); transform: translateX(-50%); }
.concept-figure::before { content: ""; position: absolute; inset: -30%; background: radial-gradient(circle at 18% 24%,rgba(164,146,255,.16),transparent 25%),radial-gradient(circle at 83% 44%,rgba(119,212,248,.15),transparent 27%),radial-gradient(circle at 48% 92%,rgba(255,184,226,.1),transparent 24%); pointer-events: none; }
.concept-head,.concept-canvas { position: relative; z-index: 1; }
.concept-head { max-width: 760px; margin-bottom: 38px; }
.concept-head h3 { margin: 0 0 14px; font-size: clamp(28px,3.8vw,44px); font-weight: 640; line-height: 1.38; letter-spacing: -.045em; }
.concept-head>p:last-child { margin: 0; color: #39414f; font-size: 15px; line-height: 1.8; }
.concept-canvas { min-height: 390px; overflow: hidden; display: grid; place-items: center; padding: clamp(28px,5vw,54px); border: 1px solid rgba(69,87,151,.1); border-radius: 28px; background: rgba(255,255,255,.73); box-shadow: inset 0 1px #fff,0 18px 46px rgba(70,82,128,.06); backdrop-filter: blur(18px); }
.concept-canvas::before { content: ""; position: absolute; inset: 0; opacity: .45; background-image: linear-gradient(rgba(78,94,145,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(78,94,145,.04) 1px,transparent 1px); background-size: 42px 42px; mask-image: radial-gradient(circle at center,#000,transparent 76%); pointer-events: none; }
.diagram-items { position: relative; z-index: 1; display: grid; width: min(100%,820px); gap: 14px; margin: 0; padding: 0; list-style: none; }
.diagram-items li { position: relative; display: flex; align-items: center; gap: 18px; min-height: 66px; margin: 0; padding: 14px 20px; border: 1px solid rgba(72,91,155,.12); border-radius: 18px; background: rgba(255,255,255,.9); box-shadow: 0 12px 28px rgba(66,79,124,.07); corner-shape: squircle; opacity: .18; transform: translateY(18px) scale(.97); transition: opacity .65s ease,transform .75s cubic-bezier(.2,.78,.2,1),box-shadow .65s ease; transition-delay: calc(var(--item-index) * 90ms); }
.concept-figure.is-active .diagram-items li { opacity: 1; transform: none; }
.diagram-framework { position: relative; z-index: 1; width: min(100%,760px); }
.diagram-framework ol { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.diagram-framework li { position: relative; display: grid; grid-template-columns: 46px minmax(108px,150px) 1fr; gap: 16px; align-items: center; min-height: 68px; margin: 0; padding: 12px 18px; border: 1px solid rgba(72,91,155,.12); border-radius: 18px; background: rgba(255,255,255,.92); box-shadow: 0 12px 28px rgba(66,79,124,.07); opacity: .16; transform: translateY(16px); transition: opacity .65s ease,transform .72s cubic-bezier(.2,.78,.2,1); transition-delay: calc(var(--item-index) * 75ms); }
.diagram-framework li:not(:last-child)::after { content: ""; position: absolute; bottom: -11px; left: 40px; z-index: 2; height: 11px; border-left: 2px solid rgba(79,103,232,.34); }
.diagram-framework li>span { color: var(--blue); font-size: 11px; font-weight: 760; letter-spacing: .08em; }
.diagram-framework li>strong { font-size: clamp(16px,1.9vw,20px); font-weight: 680; }
.diagram-framework li>small { color: #46505f; font-size: 13px; line-height: 1.6; }
.diagram-framework>p { margin: 18px 0 0; padding: 14px 18px; border-radius: 16px; background: #eef2ff; color: #3e4758; font-size: 13px; line-height: 1.7; text-align: center; opacity: .16; transform: translateY(12px); transition: opacity .65s .58s ease,transform .72s .58s cubic-bezier(.2,.78,.2,1); }
.diagram-framework>p::before { content: "↺"; margin-right: 8px; color: var(--blue); font-size: 18px; }
.concept-figure.is-active .diagram-framework li,.concept-figure.is-active .diagram-framework>p { opacity: 1; transform: none; }
.diagram-items li>span { flex: none; color: var(--blue); font-size: 11px; font-weight: 740; letter-spacing: .08em; }
.diagram-items li>strong { font-size: clamp(15px,1.8vw,19px); font-weight: 640; }
.diagram-items--cascade { width: min(100%,660px); }
.diagram-items--cascade li:nth-child(1) { width: 50%; margin-inline: auto; }
.diagram-items--cascade li:nth-child(2) { width: 73%; margin-inline: auto; }
.diagram-items--cascade li:nth-child(3) { width: 100%; }
.diagram-items--cascade li:not(:last-child)::after { content: ""; position: absolute; bottom: -15px; left: 50%; height: 15px; border-left: 2px solid rgba(79,103,232,.32); }
.diagram-items--morph { grid-template-columns: repeat(4,1fr); align-items: center; gap: 22px; }
.diagram-items--morph li { justify-content: center; min-height: 118px; padding: 16px; text-align: center; }
.diagram-items--morph li:nth-child(1) { border-radius: 50%; }
.diagram-items--morph li:nth-child(2) { border-radius: 44% 56% 42% 58% / 55% 38% 62% 45%; }
.diagram-items--morph li:nth-child(3) { border-radius: 32px; }
.diagram-items--morph li:nth-child(4) { min-height: 150px; border-color: rgba(79,103,232,.2); background: linear-gradient(145deg,#fff,#eaf0ff); box-shadow: 0 22px 48px rgba(71,91,173,.14); }
.diagram-items--timeline { grid-template-columns: repeat(4,1fr); gap: 0; }
.diagram-items--timeline::before { content: ""; position: absolute; top: 50%; right: 7%; left: 7%; height: 2px; background: linear-gradient(90deg,#d7def5,var(--blue)); transform: scaleX(0); transform-origin: left; transition: transform 1.2s .18s cubic-bezier(.2,.7,.2,1); }
.concept-figure.is-active .diagram-items--timeline::before { transform: scaleX(1); }
.diagram-items--timeline li { display: grid; min-height: 120px; place-items: center; border: 0; background: transparent; box-shadow: none; text-align: center; }
.diagram-items--timeline li::before { content: ""; width: 20px; height: 20px; border: 5px solid #fff; border-radius: 50%; background: #aeb9d6; box-shadow: 0 0 0 1px rgba(63,77,126,.13),0 8px 20px rgba(60,75,127,.12); }
.diagram-items--timeline li:last-child::before { background: var(--blue); box-shadow: 0 0 0 1px rgba(79,103,232,.16),0 0 26px rgba(79,103,232,.34); }
.diagram-items--dialog li { width: 68%; }
.diagram-items--dialog li:nth-child(even) { justify-self: end; flex-direction: row-reverse; border-color: rgba(79,103,232,.18); background: #f0f4ff; }
.diagram-items--dialog li:nth-child(odd) { justify-self: start; }
.diagram-items--judgement { grid-template-columns: repeat(5,1fr); gap: 10px; }
.diagram-items--judgement li { display: grid; min-height: 132px; align-content: center; justify-items: center; gap: 12px; padding: 12px; text-align: center; }
.diagram-items--judgement li:last-child { border-color: rgba(79,103,232,.2); background: linear-gradient(145deg,#fff,#e9efff); }
.diagram-funnel { position: relative; z-index: 1; display: grid; width: min(100%,820px); grid-template-columns: 1.5fr 130px 1fr; gap: 28px; align-items: center; }
.diagram-funnel>div { display: grid; grid-template-columns: repeat(2,1fr); gap: 10px; }
.diagram-funnel>div span { padding: 13px 12px; border: 1px solid rgba(72,91,155,.12); border-radius: 15px; background: rgba(255,255,255,.9); color: #3f4653; font-size: 13px; font-weight: 620; text-align: center; corner-shape: squircle; opacity: .25; transform: translateX(-18px); transition: .65s cubic-bezier(.2,.75,.2,1); }
.diagram-funnel>i { width: 100%; height: 160px; background: linear-gradient(90deg,rgba(167,177,208,.22),rgba(79,103,232,.34)); clip-path: polygon(0 0,100% 38%,100% 62%,0 100%); opacity: .35; transform: scaleX(.25); transform-origin: left; transition: .9s .2s cubic-bezier(.2,.7,.2,1); }
.diagram-funnel>strong { display: grid; min-height: 130px; place-items: center; padding: 20px; border: 1px solid rgba(79,103,232,.18); border-radius: 28px; background: linear-gradient(145deg,#fff,#e8eeff); box-shadow: 0 22px 48px rgba(75,92,165,.14); font-size: clamp(18px,2.3vw,25px); text-align: center; corner-shape: squircle; opacity: .2; transform: scale(.78); transition: .7s .62s cubic-bezier(.2,.78,.2,1); }
.concept-figure.is-active .diagram-funnel>div span { opacity: 1; transform: none; }
.concept-figure.is-active .diagram-funnel>i { opacity: 1; transform: scaleX(1); }
.concept-figure.is-active .diagram-funnel>strong { opacity: 1; transform: none; }
.diagram-intersection { position: relative; z-index: 1; width: min(100%,620px); aspect-ratio: 1.8; }
.intersection-circle { position: absolute; display: grid; width: 44%; aspect-ratio: 1; place-items: center; border: 1px solid rgba(66,83,143,.16); border-radius: 50%; background: rgba(213,220,246,.46); color: #343b48; font-size: 14px; font-weight: 650; backdrop-filter: blur(12px); opacity: .32; transition: opacity .75s ease,transform .9s cubic-bezier(.2,.78,.2,1); }
.intersection-circle--1 { top: 0; left: 8%; transform: translate(-24px,-12px); }
.intersection-circle--2 { top: 0; right: 8%; background: rgba(190,231,246,.45); transform: translate(24px,-12px); }
.intersection-circle--3 { bottom: 0; left: 28%; background: rgba(222,207,250,.43); transform: translateY(24px); }
.diagram-intersection>strong { position: absolute; top: 50%; left: 50%; z-index: 2; font-size: clamp(19px,2.5vw,27px); text-align: center; opacity: 0; transform: translate(-50%,-50%) scale(.7); transition: .7s .5s cubic-bezier(.2,.8,.2,1); }
.concept-figure.is-active .intersection-circle { opacity: 1; transform: none; }
.concept-figure.is-active .diagram-intersection>strong { opacity: 1; transform: translate(-50%,-50%) scale(1); }
.diagram-orbit { position: relative; z-index: 1; width: min(100%,600px); aspect-ratio: 1.6; }
.diagram-orbit>strong { position: absolute; top: 50%; left: 50%; z-index: 2; display: grid; width: 150px; aspect-ratio: 1; place-items: center; border-radius: 50%; background: linear-gradient(145deg,#667bed,#405bd7); box-shadow: 0 24px 54px rgba(66,84,184,.26); color: #fff; font-size: 18px; transform: translate(-50%,-50%) scale(.75); transition: transform .8s cubic-bezier(.2,.8,.2,1); }
.diagram-orbit>i { position: absolute; inset: 5% 18%; border: 1px solid rgba(79,103,232,.2); border-radius: 50%; transform: rotate(-12deg) scale(.7); transition: transform 1.1s .1s cubic-bezier(.2,.8,.2,1); }
.orbit-item { position: absolute; z-index: 3; padding: 10px 14px; border: 1px solid rgba(70,88,149,.13); border-radius: 14px; background: rgba(255,255,255,.94); box-shadow: 0 10px 25px rgba(68,80,122,.09); color: #343b48; font-size: 13px; font-weight: 650; corner-shape: squircle; opacity: 0; transform: scale(.7); transition: opacity .6s ease,transform .7s cubic-bezier(.2,.8,.2,1); }
.orbit-item--1 { top: 7%; left: 43%; }
.orbit-item--2 { top: 43%; right: 4%; }
.orbit-item--3 { right: 23%; bottom: 4%; }
.orbit-item--4 { top: 43%; left: 4%; }
.concept-figure.is-active .diagram-orbit>strong,.concept-figure.is-active .diagram-orbit>i { transform: translate(-50%,-50%) scale(1); }
.concept-figure.is-active .diagram-orbit>i { transform: rotate(8deg) scale(1); }
.concept-figure.is-active .orbit-item { opacity: 1; transform: none; }
.diagram-bridge { position: relative; z-index: 1; display: grid; width: min(100%,850px); grid-template-columns: repeat(4,1fr); gap: 0; }
.diagram-bridge::before { content: ""; position: absolute; top: 34px; right: 11%; left: 11%; height: 2px; background: linear-gradient(90deg,#c9d0e3,var(--blue)); transform: scaleX(0); transform-origin: left; transition: transform 1.2s .2s cubic-bezier(.2,.7,.2,1); }
.diagram-bridge>span { position: relative; z-index: 1; display: grid; justify-items: center; gap: 15px; color: #353c49; font-size: 14px; text-align: center; opacity: .18; transform: translateY(15px); transition: .7s cubic-bezier(.2,.75,.2,1); }
.diagram-bridge i { display: block; width: 68px; height: 68px; border: 1px solid rgba(70,88,149,.14); border-radius: 50%; background: #fff; box-shadow: 0 13px 30px rgba(64,77,121,.1),inset 0 0 0 10px #f0f3fc; }
.diagram-bridge>span:last-child i { background: #5970e6; box-shadow: 0 14px 34px rgba(72,91,190,.27),inset 0 0 0 10px rgba(255,255,255,.18); }
.concept-figure.is-active .diagram-bridge::before { transform: scaleX(1); }
.concept-figure.is-active .diagram-bridge>span { opacity: 1; transform: none; }
.diagram-items--converge { grid-template-columns: repeat(5,1fr); gap: 12px; }
.diagram-items--converge li { display: grid; min-height: 130px; align-content: center; justify-items: center; gap: 12px; padding: 12px; text-align: center; }
.diagram-items--converge li:last-child { border-color: rgba(79,103,232,.22); background: linear-gradient(145deg,#fff,#e6edff); box-shadow: 0 20px 42px rgba(70,88,170,.15); }
.diagram-equation { position: relative; z-index: 1; display: grid; width: min(100%,900px); grid-template-columns: 1.4fr auto 1fr auto 1.5fr; gap: 16px; align-items: center; }
.equation-token { display: grid; min-height: 110px; place-items: center; padding: 16px; border: 1px solid rgba(72,91,155,.13); border-radius: 24px; background: #fff; box-shadow: 0 14px 32px rgba(65,78,122,.08); color: #333a47; font-size: clamp(16px,2vw,22px); font-weight: 650; text-align: center; corner-shape: squircle; opacity: .18; transform: translateY(15px); transition: .7s cubic-bezier(.2,.78,.2,1); }
.equation-token--2,.equation-token--4 { min-height: auto; border: 0; background: transparent; box-shadow: none; color: var(--blue); font-size: 34px; }
.equation-token--5 { border-color: rgba(79,103,232,.2); background: linear-gradient(145deg,#fff,#e4ebff); box-shadow: 0 22px 48px rgba(72,90,176,.16); }
.concept-figure.is-active .equation-token { opacity: 1; transform: none; }
.diagram-rings { position: relative; z-index: 1; width: min(100%,600px); aspect-ratio: 1.8; }
.diagram-rings span { position: absolute; top: 50%; left: 50%; display: grid; width: calc(120px + var(--item-index) * 78px); aspect-ratio: 1; place-items: start center; padding-top: 14px; border: 1px solid rgba(73,92,157,calc(.28 - var(--item-index) * .035)); border-radius: 50%; color: #424a58; font-size: 12px; font-weight: 650; transform: translate(-50%,-50%) scale(.55); opacity: .1; transition: opacity .65s ease,transform .9s cubic-bezier(.2,.8,.2,1); transition-delay: calc(var(--item-index) * 80ms); }
.diagram-rings span:first-child { z-index: 3; place-items: center; padding: 0; background: #fff; box-shadow: 0 14px 36px rgba(64,78,125,.12); color: var(--blue); }
.diagram-rings span:last-child { color: var(--blue); }
.concept-figure.is-active .diagram-rings span { opacity: 1; transform: translate(-50%,-50%) scale(1); }

.process-figure,.process-panel,.process-flow li,.chapter-step-nav a,.chapter-end,.chapter-end a) {
  corner-shape: squircle;
}

.page-noise { position: fixed; inset: 0; z-index: 60; pointer-events: none; opacity: .025; background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.84' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E"); }

.site-header,.reader-header { position: fixed; inset: 0 0 auto; z-index: 40; display: flex; align-items: center; justify-content: space-between; min-height: 72px; padding: 0 clamp(20px,4vw,64px); border-bottom: 1px solid rgba(26,31,47,.07); background: rgba(255,255,255,.72); backdrop-filter: blur(24px) saturate(160%); -webkit-backdrop-filter: blur(24px) saturate(160%); }
.site-mark { display: flex; align-items: center; gap: 9px; text-decoration: none; font-size: 13px; font-weight: 750; letter-spacing: .08em; }
.site-mark i { width: 28px; height: 1px; background: currentColor; transform: rotate(-34deg); }
.header-link { padding: 10px 17px; border: 1px solid var(--line); border-radius: 16px; font-size: 14px; font-weight: 650; text-decoration: none; transition: .25s ease; }
.header-link:hover { border-color: rgba(73,103,255,.22); background: rgba(73,103,255,.06); transform: translateY(-1px); }

.book-entry { min-height: 100vh; background: radial-gradient(ellipse at -8% 17%,rgba(138,157,255,.34),transparent 42%),radial-gradient(ellipse at 98% 7%,rgba(182,235,255,.38),transparent 43%),radial-gradient(ellipse at 43% 4%,rgba(216,204,255,.34),transparent 42%),radial-gradient(ellipse at 6% 52%,rgba(255,207,239,.27),transparent 36%),radial-gradient(ellipse at 84% 48%,rgba(217,210,255,.24),transparent 38%),linear-gradient(180deg,#fffaff 0%,#fbfdff 44%,#fff 72%); }
.book-cover { position: relative; min-height: 70svh; overflow: hidden; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 126px 24px 66px; text-align: center; }
.cover-kicker { position: relative; z-index: 2; margin: 0 0 38px; color: #414855; font-size: 13px; font-weight: 650; line-height: 1.55; letter-spacing: .13em; }
.cover-title { position: relative; z-index: 2; }
.cover-ruby { margin: 0 0 20px; color: #303744; font-size: 16px; font-weight: 540; letter-spacing: .11em; }
.cover-title h1 { margin: 0; font: 620 clamp(68px,10vw,150px)/.96 var(--sans); letter-spacing: -.085em; white-space: nowrap; }
.cover-title h1 span { display: inline-block; margin: 0 .05em; color: #414855; font-size: .34em; font-weight: 540; letter-spacing: 0; vertical-align: .47em; }
.mobile-title-break { display: none; }
.cover-bottom { position: relative; z-index: 2; display: flex; align-items: center; justify-content: center; gap: 36px; width: min(760px,100%); margin-top: 44px; color: #303744; }
.cover-bottom p { margin: 0; font-size: 16px; line-height: 1.75; }
.cover-bottom .author { flex: none; color: var(--ink); font-weight: 650; letter-spacing: .08em; white-space: nowrap; }
.scroll-cue { position: absolute; right: 32px; bottom: 22px; z-index: 3; display: flex; flex-direction: column; align-items: center; gap: 10px; color: #3f4653; font-size: 12px; font-weight: 650; letter-spacing: .08em; text-decoration: none; }
.scroll-cue i { width: 1px; height: 32px; background: currentColor; }
.title-in { animation: title-in 1s cubic-bezier(.16,1,.3,1) both; }
.cover-title .title-in:first-child { animation-delay: .04s; }
.cover-title .title-in:last-child { animation-delay: .12s; }
@keyframes title-in { from { opacity: 0; transform: translateX(54px); filter: blur(5px); } to { opacity: 1; transform: none; filter: blur(0); } }

.contents-panel { position: relative; z-index: 4; width: min(1180px,calc(100% - 40px)); margin: 0 auto 70px; padding: clamp(44px,7vw,86px); border: 1px solid rgba(71,91,164,.12); border-radius: 38px; background: rgba(255,255,255,.72); box-shadow: 0 30px 100px rgba(59,83,158,.1),inset 0 1px 0 #fff; backdrop-filter: blur(30px) saturate(150%); -webkit-backdrop-filter: blur(30px) saturate(150%); }
.contents-intro { max-width: 750px; margin-bottom: 56px; }
.eyebrow { margin: 0 0 18px; color: var(--blue); font-size: 13px; font-weight: 720; letter-spacing: .15em; }
.contents-intro h2 { margin: 0 0 25px; font-size: clamp(48px,6vw,82px); font-weight: 590; letter-spacing: -.06em; line-height: 1; }
.contents-intro>p:last-child { max-width: 680px; margin: 0; color: #303744; font-size: 17px; line-height: 1.85; }
.toc-part { margin: 0; padding: clamp(30px,4vw,46px) 0; border-top: 1px solid rgba(29,35,52,.13); }
.toc-part-head { display: grid; grid-template-columns: 118px 1fr; gap: 20px; margin-bottom: 24px; }
.toc-part-head>span { color: var(--blue); font-size: 13px; font-weight: 720; letter-spacing: .1em; padding-top: 3px; }
.toc-part-head h2 { margin: 0; font-size: 16px; font-weight: 650; line-height: 1.65; }
.toc-list { margin-left: 138px; }
.toc-item { display: grid; grid-template-columns: 44px 1fr auto; gap: 14px; align-items: center; min-height: 66px; padding: 14px 4px; border-top: 1px solid rgba(29,35,52,.09); text-decoration: none; }
.toc-number { color: #505866; font-size: 14px; font-variant-numeric: tabular-nums; }
.toc-name { font-size: 16px; font-weight: 540; line-height: 1.55; }
.toc-status { color: #555d6a; font-size: 13px; font-weight: 560; letter-spacing: .06em; white-space: nowrap; }
.toc-action { color: var(--blue); font-size: 14px; font-weight: 700; white-space: nowrap; transition: transform .25s ease; }
.toc-action span { display: inline-block; margin-left: 5px; }
.toc-item--available { color: #1738d4; transition: transform .25s ease,color .25s ease; }
.toc-item--available:hover,.toc-item--available:focus-visible { color: var(--blue); transform: translateX(5px); outline: none; }
.toc-item--available:hover .toc-action,.toc-item--available:focus-visible .toc-action { transform: translateX(3px); }
.toc-item--future { color: #252b35; }
.book-footer { display: flex; justify-content: space-between; gap: 20px; padding: 42px 8px 0; border-top: 1px solid rgba(29,35,52,.13); color: #424a57; font-size: 13px; font-weight: 560; letter-spacing: .08em; }

.js .reveal { opacity: 0; transform: translateY(22px); transition: opacity .75s ease,transform .75s cubic-bezier(.2,.7,.2,1); }
.js .reveal.is-visible { opacity: 1; transform: none; }

.reading-progress { position: fixed; inset: 0 0 auto; height: 3px; z-index: 60; background: rgba(73,103,255,.08); }
.reading-progress span { display: block; width: 100%; height: 100%; background: linear-gradient(90deg,var(--blue),var(--violet),var(--cyan)); transform: scaleX(0); transform-origin: left center; }
.reader-header { top: 3px; display: grid; grid-template-columns: 1fr auto 1fr; min-height: 66px; }
.reader-header a { text-decoration: none; }
.reader-book { font-size: 15px; font-weight: 680; letter-spacing: .04em; }
.reader-contents { padding: 9px 15px; border: 1px solid var(--line); border-radius: 15px; font-size: 14px; font-weight: 650; }
.reader-position { justify-self: end; color: var(--muted); font-size: 14px; font-variant-numeric: tabular-nums; }
.reader-main { padding-top: 69px; background: #fff; }
.reader-main article { margin: 0; }
.chapter-hero { position: relative; min-height: calc(94svh - 69px); overflow: hidden; display: grid; grid-template-rows: auto 1fr auto; align-items: center; padding: clamp(54px,8vw,108px) max(28px,calc((100vw - 1120px)/2)) 54px; background: radial-gradient(ellipse at -6% 10%,rgba(154,169,255,.3),transparent 42%),radial-gradient(ellipse at 100% 4%,rgba(190,236,255,.36),transparent 43%),radial-gradient(ellipse at 52% 14%,rgba(224,211,255,.3),transparent 42%),radial-gradient(ellipse at 13% 82%,rgba(255,215,239,.2),transparent 36%),linear-gradient(155deg,#fffaff,#fbfdff 54%,#fff); color: var(--ink); }
.chapter-label { position: relative; z-index: 2; display: flex; justify-content: space-between; margin: 0; color: #333a46; font-size: 13px; font-weight: 700; letter-spacing: .12em; }
.chapter-title { position: relative; z-index: 2; max-width: 1080px; margin: auto 0; padding: 8vh 0; font: 600 clamp(48px,7vw,100px)/1.18 var(--sans); letter-spacing: -.07em; text-wrap: balance; }
.chapter-title--long { max-width: 1180px; font-size: clamp(42px,5.8vw,82px); line-height: 1.25; }
.chapter-title-keep { white-space: nowrap; }
.chapter-title-sub { display: block; margin-top: .34em; color: #343b48; font-size: .38em; font-weight: 540; letter-spacing: -.02em; }
.chapter-lead { position: relative; z-index: 2; max-width: 620px; margin: 0; color: #303744; font-size: 17px; font-weight: 500; line-height: 1.85; }
.chapter-scroll { position: absolute; left: 28px; bottom: 36px; display: flex; align-items: center; gap: 12px; color: #4e5664; font-size: 11px; font-weight: 650; letter-spacing: .1em; transform: rotate(-90deg); transform-origin: left center; }
.chapter-scroll span { width: 38px; height: 1px; background: currentColor; }
.article-body { max-width: 800px; margin: 0 auto; padding: 124px 28px 60px; color: #222731; font-size: 18px; line-height: 2.04; }
.article-body h2 { margin: 118px 0 42px; font-size: clamp(29px,3.7vw,43px); font-weight: 640; line-height: 1.48; letter-spacing: -.04em; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { margin: 64px 0 26px; font-size: clamp(22px,2.7vw,30px); font-weight: 640; line-height: 1.5; letter-spacing: -.025em; }
.prose-group { margin-bottom: 40px; }
.prose-group p { margin: 0 0 .72em; }
.article-body strong { font-weight: 700; }
.article-body blockquote { margin: 58px 0; padding: 8px 0 8px 26px; border-left: 3px solid #8fa2ff; color: #303846; font-size: clamp(20px,2.5vw,27px); font-weight: 580; line-height: 1.8; }
.article-body ul { margin: 30px 0 44px; padding-left: 1.2em; }
.article-body li { margin: .55em 0; padding-left: .3em; }
.article-body hr { width: 92px; margin: 94px 0; border: 0; border-top: 2px solid #dce2ff; }

.concept-figure { position: relative; width: min(1060px,calc(100vw - 40px)); overflow: hidden; margin: 92px 50% 112px; padding: clamp(30px,5vw,56px); border: 1px solid rgba(73,92,157,.1); border-radius: 38px; background: linear-gradient(145deg,rgba(252,249,255,.98),rgba(241,248,255,.96) 58%,#fff); box-shadow: 0 30px 90px rgba(61,76,128,.11),inset 0 1px #fff; color: var(--ink); font-family: var(--sans); transform: translateX(-50%); }
.concept-figure::before { content: ""; position: absolute; inset: -30%; background: radial-gradient(circle at 18% 24%,rgba(164,146,255,.16),transparent 25%),radial-gradient(circle at 83% 44%,rgba(119,212,248,.15),transparent 27%),radial-gradient(circle at 48% 92%,rgba(255,184,226,.1),transparent 24%); pointer-events: none; }
.concept-head,.concept-canvas { position: relative; z-index: 1; }
.concept-head { max-width: 760px; margin-bottom: 38px; }
.concept-head h3 { margin: 0 0 14px; font-size: clamp(28px,3.8vw,44px); font-weight: 640; line-height: 1.38; letter-spacing: -.045em; }
.concept-head>p:last-child { margin: 0; color: #39414f; font-size: 15px; line-height: 1.8; }
.concept-canvas { min-height: 390px; overflow: hidden; display: grid; place-items: center; padding: clamp(28px,5vw,54px); border: 1px solid rgba(69,87,151,.1); border-radius: 28px; background: rgba(255,255,255,.73); box-shadow: inset 0 1px #fff,0 18px 46px rgba(70,82,128,.06); backdrop-filter: blur(18px); }
.concept-canvas::before { content: ""; position: absolute; inset: 0; opacity: .45; background-image: linear-gradient(rgba(78,94,145,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(78,94,145,.04) 1px,transparent 1px); background-size: 42px 42px; mask-image: radial-gradient(circle at center,#000,transparent 76%); pointer-events: none; }
.diagram-items { position: relative; z-index: 1; display: grid; width: min(100%,820px); gap: 14px; margin: 0; padding: 0; list-style: none; }
.diagram-items li { position: relative; display: flex; align-items: center; gap: 18px; min-height: 66px; margin: 0; padding: 14px 20px; border: 1px solid rgba(72,91,155,.12); border-radius: 18px; background: rgba(255,255,255,.9); box-shadow: 0 12px 28px rgba(66,79,124,.07); corner-shape: squircle; opacity: .18; transform: translateY(18px) scale(.97); transition: opacity .65s ease,transform .75s cubic-bezier(.2,.78,.2,1),box-shadow .65s ease; transition-delay: calc(var(--item-index) * 90ms); }
.concept-figure.is-active .diagram-items li { opacity: 1; transform: none; }
.diagram-framework { position: relative; z-index: 1; width: min(100%,760px); }
.diagram-framework ol { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.diagram-framework li { position: relative; display: grid; grid-template-columns: 46px minmax(108px,150px) 1fr; gap: 16px; align-items: center; min-height: 68px; margin: 0; padding: 12px 18px; border: 1px solid rgba(72,91,155,.12); border-radius: 18px; background: rgba(255,255,255,.92); box-shadow: 0 12px 28px rgba(66,79,124,.07); opacity: .16; transform: translateY(16px); transition: opacity .65s ease,transform .72s cubic-bezier(.2,.78,.2,1); transition-delay: calc(var(--item-index) * 75ms); }
.diagram-framework li:not(:last-child)::after { content: ""; position: absolute; bottom: -11px; left: 40px; z-index: 2; height: 11px; border-left: 2px solid rgba(79,103,232,.34); }
.diagram-framework li>span { color: var(--blue); font-size: 11px; font-weight: 760; letter-spacing: .08em; }
.diagram-framework li>strong { font-size: clamp(16px,1.9vw,20px); font-weight: 680; }
.diagram-framework li>small { color: #46505f; font-size: 13px; line-height: 1.6; }
.diagram-framework>p { margin: 18px 0 0; padding: 14px 18px; border-radius: 16px; background: #eef2ff; color: #3e4758; font-size: 13px; line-height: 1.7; text-align: center; opacity: .16; transform: translateY(12px); transition: opacity .65s .58s ease,transform .72s .58s cubic-bezier(.2,.78,.2,1); }
.diagram-framework>p::before { content: "↺"; margin-right: 8px; color: var(--blue); font-size: 18px; }
.concept-figure.is-active .diagram-framework li,.concept-figure.is-active .diagram-framework>p { opacity: 1; transform: none; }
.diagram-items li>span { flex: none; color: var(--blue); font-size: 11px; font-weight: 740; letter-spacing: .08em; }
.diagram-items li>strong { font-size: clamp(15px,1.8vw,19px); font-weight: 640; }
.diagram-items--cascade { width: min(100%,660px); }
.diagram-items--cascade li:nth-child(1) { width: 50%; margin-inline: auto; }
.diagram-items--cascade li:nth-child(2) { width: 73%; margin-inline: auto; }
.diagram-items--cascade li:nth-child(3) { width: 100%; }
.diagram-items--cascade li:not(:last-child)::after { content: ""; position: absolute; bottom: -15px; left: 50%; height: 15px; border-left: 2px solid rgba(79,103,232,.32); }
.diagram-items--morph { grid-template-columns: repeat(4,1fr); align-items: center; gap: 22px; }
.diagram-items--morph li { justify-content: center; min-height: 118px; padding: 16px; text-align: center; }
.diagram-items--morph li:nth-child(1) { border-radius: 50%; }
.diagram-items--morph li:nth-child(2) { border-radius: 44% 56% 42% 58% / 55% 38% 62% 45%; }
.diagram-items--morph li:nth-child(3) { border-radius: 32px; }
.diagram-items--morph li:nth-child(4) { min-height: 150px; border-color: rgba(79,103,232,.2); background: linear-gradient(145deg,#fff,#eaf0ff); box-shadow: 0 22px 48px rgba(71,91,173,.14); }
.diagram-items--timeline { grid-template-columns: repeat(4,1fr); gap: 0; }
.diagram-items--timeline::before { content: ""; position: absolute; top: 50%; right: 7%; left: 7%; height: 2px; background: linear-gradient(90deg,#d7def5,var(--blue)); transform: scaleX(0); transform-origin: left; transition: transform 1.2s .18s cubic-bezier(.2,.7,.2,1); }
.concept-figure.is-active .diagram-items--timeline::before { transform: scaleX(1); }
.diagram-items--timeline li { display: grid; min-height: 120px; place-items: center; border: 0; background: transparent; box-shadow: none; text-align: center; }
.diagram-items--timeline li::before { content: ""; width: 20px; height: 20px; border: 5px solid #fff; border-radius: 50%; background: #aeb9d6; box-shadow: 0 0 0 1px rgba(63,77,126,.13),0 8px 20px rgba(60,75,127,.12); }
.diagram-items--timeline li:last-child::before { background: var(--blue); box-shadow: 0 0 0 1px rgba(79,103,232,.16),0 0 26px rgba(79,103,232,.34); }
.diagram-items--dialog li { width: 68%; }
.diagram-items--dialog li:nth-child(even) { justify-self: end; flex-direction: row-reverse; border-color: rgba(79,103,232,.18); background: #f0f4ff; }
.diagram-items--dialog li:nth-child(odd) { justify-self: start; }
.diagram-items--judgement { grid-template-columns: repeat(5,1fr); gap: 10px; }
.diagram-items--judgement li { display: grid; min-height: 132px; align-content: center; justify-items: center; gap: 12px; padding: 12px; text-align: center; }
.diagram-items--judgement li:last-child { border-color: rgba(79,103,232,.2); background: linear-gradient(145deg,#fff,#e9efff); }
.diagram-funnel { position: relative; z-index: 1; display: grid; width: min(100%,820px); grid-template-columns: 1.5fr 130px 1fr; gap: 28px; align-items: center; }
.diagram-funnel>div { display: grid; grid-template-columns: repeat(2,1fr); gap: 10px; }
.diagram-funnel>div span { padding: 13px 12px; border: 1px solid rgba(72,91,155,.12); border-radius: 15px; background: rgba(255,255,255,.9); color: #3f4653; font-size: 13px; font-weight: 620; text-align: center; corner-shape: squircle; opacity: .25; transform: translateX(-18px); transition: .65s cubic-bezier(.2,.75,.2,1); }
.diagram-funnel>i { width: 100%; height: 160px; background: linear-gradient(90deg,rgba(167,177,208,.22),rgba(79,103,232,.34)); clip-path: polygon(0 0,100% 38%,100% 62%,0 100%); opacity: .35; transform: scaleX(.25); transform-origin: left; transition: .9s .2s cubic-bezier(.2,.7,.2,1); }
.diagram-funnel>strong { display: grid; min-height: 130px; place-items: center; padding: 20px; border: 1px solid rgba(79,103,232,.18); border-radius: 28px; background: linear-gradient(145deg,#fff,#e8eeff); box-shadow: 0 22px 48px rgba(75,92,165,.14); font-size: clamp(18px,2.3vw,25px); text-align: center; corner-shape: squircle; opacity: .2; transform: scale(.78); transition: .7s .62s cubic-bezier(.2,.78,.2,1); }
.concept-figure.is-active .diagram-funnel>div span { opacity: 1; transform: none; }
.concept-figure.is-active .diagram-funnel>i { opacity: 1; transform: scaleX(1); }
.concept-figure.is-active .diagram-funnel>strong { opacity: 1; transform: none; }
.diagram-intersection { position: relative; z-index: 1; width: min(100%,620px); aspect-ratio: 1.8; }
.intersection-circle { position: absolute; display: grid; width: 44%; aspect-ratio: 1; place-items: center; border: 1px solid rgba(66,83,143,.16); border-radius: 50%; background: rgba(213,220,246,.46); color: #343b48; font-size: 14px; font-weight: 650; backdrop-filter: blur(12px); opacity: .32; transition: opacity .75s ease,transform .9s cubic-bezier(.2,.78,.2,1); }
.intersection-circle--1 { top: 0; left: 8%; transform: translate(-24px,-12px); }
.intersection-circle--2 { top: 0; right: 8%; background: rgba(190,231,246,.45); transform: translate(24px,-12px); }
.intersection-circle--3 { bottom: 0; left: 28%; background: rgba(222,207,250,.43); transform: translateY(24px); }
.diagram-intersection>strong { position: absolute; top: 50%; left: 50%; z-index: 2; font-size: clamp(19px,2.5vw,27px); text-align: center; opacity: 0; transform: translate(-50%,-50%) scale(.7); transition: .7s .5s cubic-bezier(.2,.8,.2,1); }
.concept-figure.is-active .intersection-circle { opacity: 1; transform: none; }
.concept-figure.is-active .diagram-intersection>strong { opacity: 1; transform: translate(-50%,-50%) scale(1); }
.diagram-orbit { position: relative; z-index: 1; width: min(100%,600px); aspect-ratio: 1.6; }
.diagram-orbit>strong { position: absolute; top: 50%; left: 50%; z-index: 2; display: grid; width: 150px; aspect-ratio: 1; place-items: center; border-radius: 50%; background: linear-gradient(145deg,#667bed,#405bd7); box-shadow: 0 24px 54px rgba(66,84,184,.26); color: #fff; font-size: 18px; transform: translate(-50%,-50%) scale(.75); transition: transform .8s cubic-bezier(.2,.8,.2,1); }
.diagram-orbit>i { position: absolute; inset: 5% 18%; border: 1px solid rgba(79,103,232,.2); border-radius: 50%; transform: rotate(-12deg) scale(.7); transition: transform 1.1s .1s cubic-bezier(.2,.8,.2,1); }
.orbit-item { position: absolute; z-index: 3; padding: 10px 14px; border: 1px solid rgba(70,88,149,.13); border-radius: 14px; background: rgba(255,255,255,.94); box-shadow: 0 10px 25px rgba(68,80,122,.09); color: #343b48; font-size: 13px; font-weight: 650; corner-shape: squircle; opacity: 0; transform: scale(.7); transition: opacity .6s ease,transform .7s cubic-bezier(.2,.8,.2,1); }
.orbit-item--1 { top: 7%; left: 43%; }
.orbit-item--2 { top: 43%; right: 4%; }
.orbit-item--3 { right: 23%; bottom: 4%; }
.orbit-item--4 { top: 43%; left: 4%; }
.concept-figure.is-active .diagram-orbit>strong,.concept-figure.is-active .diagram-orbit>i { transform: translate(-50%,-50%) scale(1); }
.concept-figure.is-active .diagram-orbit>i { transform: rotate(8deg) scale(1); }
.concept-figure.is-active .orbit-item { opacity: 1; transform: none; }
.diagram-bridge { position: relative; z-index: 1; display: grid; width: min(100%,850px); grid-template-columns: repeat(4,1fr); gap: 0; }
.diagram-bridge::before { content: ""; position: absolute; top: 34px; right: 11%; left: 11%; height: 2px; background: linear-gradient(90deg,#c9d0e3,var(--blue)); transform: scaleX(0); transform-origin: left; transition: transform 1.2s .2s cubic-bezier(.2,.7,.2,1); }
.diagram-bridge>span { position: relative; z-index: 1; display: grid; justify-items: center; gap: 15px; color: #353c49; font-size: 14px; text-align: center; opacity: .18; transform: translateY(15px); transition: .7s cubic-bezier(.2,.75,.2,1); }
.diagram-bridge i { display: block; width: 68px; height: 68px; border: 1px solid rgba(70,88,149,.14); border-radius: 50%; background: #fff; box-shadow: 0 13px 30px rgba(64,77,121,.1),inset 0 0 0 10px #f0f3fc; }
.diagram-bridge>span:last-child i { background: #5970e6; box-shadow: 0 14px 34px rgba(72,91,190,.27),inset 0 0 0 10px rgba(255,255,255,.18); }
.concept-figure.is-active .diagram-bridge::before { transform: scaleX(1); }
.concept-figure.is-active .diagram-bridge>span { opacity: 1; transform: none; }
.diagram-items--converge { grid-template-columns: repeat(5,1fr); gap: 12px; }
.diagram-items--converge li { display: grid; min-height: 130px; align-content: center; justify-items: center; gap: 12px; padding: 12px; text-align: center; }
.diagram-items--converge li:last-child { border-color: rgba(79,103,232,.22); background: linear-gradient(145deg,#fff,#e6edff); box-shadow: 0 20px 42px rgba(70,88,170,.15); }
.diagram-equation { position: relative; z-index: 1; display: grid; width: min(100%,900px); grid-template-columns: 1.4fr auto 1fr auto 1.5fr; gap: 16px; align-items: center; }
.equation-token { display: grid; min-height: 110px; place-items: center; padding: 16px; border: 1px solid rgba(72,91,155,.13); border-radius: 24px; background: #fff; box-shadow: 0 14px 32px rgba(65,78,122,.08); color: #333a47; font-size: clamp(16px,2vw,22px); font-weight: 650; text-align: center; corner-shape: squircle; opacity: .18; transform: translateY(15px); transition: .7s cubic-bezier(.2,.78,.2,1); }
.equation-token--2,.equation-token--4 { min-height: auto; border: 0; background: transparent; box-shadow: none; color: var(--blue); font-size: 34px; }
.equation-token--5 { border-color: rgba(79,103,232,.2); background: linear-gradient(145deg,#fff,#e4ebff); box-shadow: 0 22px 48px rgba(72,90,176,.16); }
.concept-figure.is-active .equation-token { opacity: 1; transform: none; }
.diagram-rings { position: relative; z-index: 1; width: min(100%,600px); aspect-ratio: 1.8; }
.diagram-rings span { position: absolute; top: 50%; left: 50%; display: grid; width: calc(120px + var(--item-index) * 78px); aspect-ratio: 1; place-items: start center; padding-top: 14px; border: 1px solid rgba(73,92,157,calc(.28 - var(--item-index) * .035)); border-radius: 50%; color: #424a58; font-size: 12px; font-weight: 650; transform: translate(-50%,-50%) scale(.55); opacity: .1; transition: opacity .65s ease,transform .9s cubic-bezier(.2,.8,.2,1); transition-delay: calc(var(--item-index) * 80ms); }
.diagram-rings span:first-child { z-index: 3; place-items: center; padding: 0; background: #fff; box-shadow: 0 14px 36px rgba(64,78,125,.12); color: var(--blue); }
.diagram-rings span:last-child { color: var(--blue); }
.concept-figure.is-active .diagram-rings span { opacity: 1; transform: translate(-50%,-50%) scale(1); }

.chapter-step-nav { display: flex; justify-content: space-between; gap: 20px; width: min(800px,calc(100% - 56px)); margin: 56px auto 0; padding-top: 28px; border-top: 1px solid rgba(29,35,52,.1); }
.chapter-step-nav a { padding: 10px 14px; border-radius: 14px; color: #444c59; font-size: 14px; font-weight: 650; text-decoration: none; }
.chapter-step-nav a:hover { background: #f2f5ff; color: var(--blue); }
.chapter-next-label { margin: 0 0 16px; color: #5c6575; font-size: 12px; font-weight: 720; letter-spacing: .12em; }
.chapter-end h2 { max-width: 820px; margin: 0 0 44px; font-size: clamp(27px,3.5vw,42px); font-weight: 600; line-height: 1.55; letter-spacing: -.04em; }

.process-figure { position: relative; width: min(1100px,calc(100vw - 40px)); overflow: hidden; margin: 112px 50% 132px; padding: clamp(34px,5vw,58px); border: 1px solid rgba(75,91,155,.11); border-radius: 38px; background: linear-gradient(145deg,rgba(252,248,255,.98),rgba(242,249,255,.98) 58%,#fff); box-shadow: 0 34px 100px rgba(63,74,122,.12),inset 0 1px 0 #fff; color: var(--ink); font-family: var(--sans); transform: translateX(-50%); }
.process-figure::before { content: ""; position: absolute; inset: -26%; background: radial-gradient(circle at 23% 23%,rgba(168,151,255,.18),transparent 26%),radial-gradient(circle at 78% 56%,rgba(139,222,250,.18),transparent 27%),radial-gradient(circle at 48% 92%,rgba(255,185,225,.13),transparent 24%); pointer-events: none; }
.process-head,.process-panel,.process-shift { position: relative; z-index: 2; }
.process-head { max-width: 760px; margin-bottom: 48px; }
.process-head h3 { margin: 0 0 18px; font-size: clamp(29px,3.7vw,44px); font-weight: 640; line-height: 1.35; letter-spacing: -.045em; }
.process-head>p:last-child { margin: 0; color: #39414e; font-size: 16px; line-height: 1.8; }
.process-panel { padding: clamp(24px,3.5vw,38px); border: 1px solid rgba(77,93,150,.1); border-radius: 27px; background: rgba(255,255,255,.76); box-shadow: inset 0 1px 0 #fff,0 16px 42px rgba(75,86,130,.06); backdrop-filter: blur(18px); }
.process-panel--after { border-color: rgba(79,103,232,.16); background: linear-gradient(145deg,rgba(255,255,255,.94),rgba(232,239,255,.84)); }
.process-meta { display: flex; justify-content: space-between; gap: 24px; align-items: baseline; margin-bottom: 30px; }
.process-meta span { display: block; margin-bottom: 7px; color: #3c4451; font-size: 13px; font-weight: 720; letter-spacing: .08em; }
.process-meta h4 { margin: 0; font-size: clamp(21px,2.7vw,29px); font-weight: 640; letter-spacing: -.025em; }
.process-meta>strong { color: var(--blue); font-size: clamp(21px,2.7vw,31px); font-weight: 620; white-space: nowrap; }
.process-flow { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.process-flow--long { grid-template-columns: repeat(6,1fr); }
.process-flow--short { grid-template-columns: repeat(4,1fr); }
.process-flow li { position: relative; min-height: 142px; padding: 15px 13px; border: 1px solid rgba(79,96,160,.11); border-radius: 18px; background: rgba(255,255,255,.86); box-shadow: 0 10px 26px rgba(71,82,130,.06),inset 0 1px 0 #fff; }
.process-flow li:not(:last-child)::after { content: ""; position: absolute; top: 50%; right: -11px; z-index: 3; width: 11px; border-top: 2px solid rgba(73,103,255,.4); }
.process-flow li>span { display: block; margin-bottom: 20px; color: var(--blue); font-size: 12px; font-weight: 700; }
.process-flow li>strong { display: block; color: #2c333f; font-size: 14px; font-weight: 660; line-height: 1.45; }
.process-flow li>small { display: block; margin-top: 8px; color: #59616e; font-size: 11px; font-weight: 540; line-height: 1.5; }
.process-note { margin: 25px 0 0; color: #333a46; font-size: 15px; line-height: 1.75; }
.process-shift { display: grid; grid-template-columns: 1fr auto 1fr; gap: 18px; align-items: center; padding: 42px 12px; color: #4b5360; }
.process-shift span { height: 1px; background: linear-gradient(90deg,transparent,rgba(79,103,232,.28)); }
.process-shift span:last-child { background: linear-gradient(90deg,rgba(79,103,232,.28),transparent); }
.process-shift p { margin: 0; font-size: 14px; font-weight: 650; letter-spacing: .04em; text-align: center; }

:root {
  --blue: var(--accent);
  --violet: #806d60;
  --cyan: #6b8e86;
  --sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
}

.reading-progress {
  position: fixed;
  inset: 0 0 auto var(--side);
  z-index: 30;
  height: 2px;
  background: transparent;
}

.reading-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
}

.home .reading-progress { display: none; }
.hero-reader .hero-question {
  max-width: 760px;
  margin: 30px 0 22px;
  color: var(--ink);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.55;
}
.hero-reader .hero-copy {
  max-width: 720px;
  margin: 0 0 1.1em;
  color: #4f4c47;
  font-size: 17px;
}
.hero-prompts {
  display: grid;
  gap: 5px;
  margin: 28px 0;
  padding-left: 20px;
  border-left: 2px solid var(--accent);
  font-size: 18px;
  line-height: 1.75;
}
.start-reading {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  margin-top: 20px;
  padding: 10px 22px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--paper);
  background: var(--accent);
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 650;
  text-decoration: none;
  transition: transform .2s ease, background-color .2s ease;
}
.start-reading:hover { transform: translateY(-2px); background: #284d46; }
.start-reading:focus-visible { outline: 3px solid rgba(49, 92, 84, .25); outline-offset: 3px; }
.reader-closing {
  max-width: 720px;
  margin: 62px 0 0;
  padding: 54px 0 8px;
  border-top: 1px solid var(--line);
}
.reader-closing h2 { margin: 0 0 28px; font-size: 25px; }
.reader-closing p { margin: 0 0 1.35em; color: #4f4c47; font-size: 17px; }
.reader-closing .closing-principles { line-height: 2; }
.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font: 650 11px/1.5 var(--sans);
  letter-spacing: .16em;
}

.concept-figure,
.process-figure {
  width: min(860px, calc(100vw - var(--side) - 84px));
  margin: 84px 50% 96px;
  padding: clamp(30px, 4vw, 46px);
  border-color: var(--line);
  border-radius: 4px;
  background: #f6f4ef;
  box-shadow: none;
  color: var(--ink);
  font-family: inherit;
}

.concept-figure::before,
.process-figure::before,
.concept-canvas::before { display: none; }

.concept-head { max-width: 650px; margin-bottom: 32px; }
.concept-head h3,
.process-head h3 {
  color: var(--ink);
  font-family: inherit;
  font-weight: 700;
  letter-spacing: .01em;
}

.concept-head > p:last-child,
.process-head > p:last-child,
.process-note { color: #595751; }

.concept-canvas,
.process-panel {
  border-color: var(--line);
  border-radius: 3px;
  background: var(--paper);
  box-shadow: none;
  backdrop-filter: none;
}

.diagram-items li,
.diagram-funnel > div span,
.orbit-item,
.equation-token {
  border-color: var(--line);
  border-radius: 3px;
  background: #fffefb;
  box-shadow: none;
}

.diagram-items li > span,
.process-flow li > span,
.process-meta > strong { color: var(--accent); }

.diagram-items--dialog li:nth-child(even),
.diagram-items--judgement li:last-child,
.diagram-items--converge li:last-child,
.equation-token--5,
.process-panel--after {
  border-color: #bdc9c4;
  background: #edf2ef;
  box-shadow: none;
}

.diagram-funnel > strong {
  border-color: #bdc9c4;
  border-radius: 3px;
  background: #edf2ef;
  box-shadow: none;
}

.diagram-funnel > i,
.diagram-items--timeline::before,
.diagram-bridge::before {
  background: linear-gradient(90deg, #d9d6ce, var(--accent));
}

.intersection-circle {
  border-color: #c9c5bc;
  background: rgba(226, 224, 217, .72);
  color: #4d4b46;
}
.intersection-circle--2 { background: rgba(216, 228, 224, .72); }
.intersection-circle--3 { background: rgba(228, 221, 214, .72); }

.diagram-orbit > strong,
.diagram-bridge > span:last-child i {
  background: var(--accent);
  box-shadow: none;
}

.diagram-orbit > i { border-color: rgba(49, 92, 84, .28); }
.diagram-bridge i { border-color: var(--line); box-shadow: inset 0 0 0 10px #efede7; }
.diagram-rings span { border-color: rgba(49, 92, 84, .24); color: #595751; }
.diagram-rings span:first-child { box-shadow: none; color: var(--accent); }

.process-flow li {
  border-color: var(--line);
  border-radius: 3px;
  background: #fffefb;
  box-shadow: none;
}
.process-flow li:not(:last-child)::after { border-color: rgba(49, 92, 84, .38); }
.process-flow li > strong { color: var(--ink); }
.process-flow li > small { color: var(--muted); }

/* Keep the process comparison in normal document flow. Its box should end
   with its visible content, without leaving a scroll-only tail. */
.process-figure {
  height: auto !important;
  min-height: 0 !important;
  overflow: visible;
  margin-top: 72px;
  margin-bottom: 80px;
}
.process-head { margin-bottom: 32px; }
.process-shift { padding-block: 30px; }

@media (max-width: 860px) {
  .reading-progress { left: 0; }
  .hero-reader .hero-question { margin-top: 26px; font-size: 25px; }
  .hero-reader .hero-copy,
  .reader-closing p { font-size: 16px; }
  .hero-prompts { padding-left: 16px; font-size: 17px; }
  .start-reading { width: 100%; justify-content: center; }
  .reader-closing { margin-top: 48px; padding-top: 42px; }
  .concept-figure,
  .process-figure {
    width: calc(100vw - 32px);
    margin-top: 70px;
    margin-bottom: 82px;
    padding: 25px 13px;
  }
  .concept-head,
  .process-head { margin-bottom: 28px; padding: 0 5px; }
  .concept-head h3,
  .process-head h3 { font-size: clamp(23px, 7vw, 31px); }
  .concept-head > p:last-child,
  .process-head > p:last-child { font-size: 14px; }
  .concept-canvas { min-height: 330px; padding: 22px 12px; }
  .diagram-items--morph,
  .diagram-items--timeline,
  .diagram-items--judgement,
  .diagram-items--converge { grid-template-columns: 1fr; gap: 8px; }
  .diagram-items--morph li,
  .diagram-items--timeline li,
  .diagram-items--judgement li,
  .diagram-items--converge li { min-height: 68px; }
  .diagram-items--morph li:nth-child(1),
  .diagram-items--morph li:nth-child(2) { border-radius: 3px; }
  .diagram-items--morph li:nth-child(4) { min-height: 84px; }
  .diagram-items--timeline::before {
    top: 7%; bottom: 7%; left: 28px; width: 2px; height: auto;
    transform: scaleY(0); transform-origin: top;
  }
  .concept-figure.is-active .diagram-items--timeline::before { transform: scaleY(1); }
  .diagram-items--timeline li { grid-template-columns: 34px 1fr; justify-items: start; text-align: left; }
  .diagram-items--dialog li { width: 92%; }
  .diagram-funnel { grid-template-columns: 1fr; gap: 16px; }
  .diagram-funnel > i {
    height: 64px;
    clip-path: polygon(0 0, 100% 0, 62% 100%, 38% 100%);
    transform: scaleY(.25);
    transform-origin: top;
  }
  .concept-figure.is-active .diagram-funnel > i { transform: scaleY(1); }
  .diagram-funnel > strong { min-height: 84px; }
  .diagram-intersection { width: min(100%, 410px); aspect-ratio: 1.05; }
  .intersection-circle { width: 58%; font-size: 12px; }
  .intersection-circle--1 { left: 2%; }
  .intersection-circle--2 { right: 2%; }
  .intersection-circle--3 { left: 21%; }
  .diagram-orbit { width: min(100%, 410px); aspect-ratio: 1; }
  .diagram-orbit > strong { width: 116px; font-size: 16px; }
  .diagram-orbit > i { inset: 10% 7%; }
  .diagram-bridge { width: min(100%, 350px); grid-template-columns: 1fr; gap: 20px; }
  .diagram-bridge::before {
    top: 8%; bottom: 8%; left: 50%; width: 2px; height: auto;
    transform: scaleY(0); transform-origin: top;
  }
  .concept-figure.is-active .diagram-bridge::before { transform: scaleY(1); }
  .diagram-bridge > span { grid-template-columns: 68px 1fr; align-items: center; justify-items: start; text-align: left; }
  .diagram-equation { grid-template-columns: 1fr; gap: 7px; }
  .equation-token { min-height: 74px; }
  .equation-token--2,
  .equation-token--4 { min-height: 30px; }
  .diagram-rings { width: min(100%, 390px); aspect-ratio: 1; }
  .diagram-rings span { width: calc(76px + var(--item-index) * 48px); padding-top: 9px; font-size: 10px; }
  .process-panel { padding: 19px 13px; }
  .process-meta { display: grid; gap: 7px; margin-bottom: 20px; }
  .process-flow--long,
  .process-flow--short { grid-template-columns: 1fr; gap: 8px; }
  .process-flow li { min-height: 0; padding: 13px 13px 13px 48px; }
  .process-flow li:not(:last-child)::after {
    top: auto; right: auto; bottom: -9px; left: 27px;
    width: 1px; height: 9px; border: 0; border-left: 2px solid rgba(49, 92, 84, .38);
  }
  .process-flow li > span { position: absolute; top: 15px; left: 13px; margin: 0; }
  .process-shift { grid-template-columns: 1fr; padding: 30px 4px; }
  .process-shift span { display: none; }
}

@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 .reveal { opacity: 1; transform: none; }
}

@media print {
  .reading-progress { display: none; }
  .concept-figure,
  .process-figure { width: 100%; transform: none; margin: 48px 0; break-inside: avoid; }
  .diagram-items li,
  .intersection-circle,
  .orbit-item,
  .diagram-bridge > span,
  .equation-token,
  .diagram-rings span { opacity: 1; transform: none; }
}