:root {
  --ink: #0a0a0a;
  --paper: #f3f1ea;
  --white: #fff;
  --cyan: #9fc9eb;
  --yellow: #f5dd25;
  --blue: #3157c9;
  --lime: #b9c62d;
  --film-grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180' viewBox='0 0 180 180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.72' numOctaves='4' seed='17' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.96'/%3E%3C/svg%3E");
  --film-dust: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='260' height='260' viewBox='0 0 260 260'%3E%3Cfilter id='d'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.19' numOctaves='3' seed='43' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='1.35 0 0 0 -.18 0 1.35 0 0 -.18 0 0 1.35 0 -.18 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23d)' opacity='.9'/%3E%3C/svg%3E");
  --line: 1px solid var(--ink);
  --header-h: 58px;
  --pad: clamp(18px, 3.2vw, 54px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
}
body::before {
  z-index: 998;
  opacity: .045;
  background-image: var(--film-grain);
  background-size: 180px 180px;
  mix-blend-mode: normal;
}
body::after {
  z-index: 999;
  opacity: .02;
  background-image: var(--film-dust);
  background-size: 260px 260px;
  mix-blend-mode: normal;
}
button, a { font: inherit; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
p, h1, h2, h3 { margin: 0; }
::selection { background: var(--yellow); color: var(--ink); }

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 200;
  left: 12px;
  top: 12px;
  padding: 10px 14px;
  background: var(--white);
  border: var(--line);
  transform: translateY(-140%);
}
.skip-link:focus { transform: translateY(0); }

.reading-progress {
  position: fixed;
  inset: 0 0 auto;
  height: 4px;
  background: transparent;
  z-index: 150;
}
.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--yellow);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--header-h);
  display: grid;
  grid-template-columns: 175px 1fr auto;
  align-items: stretch;
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  border-bottom: var(--line);
  backdrop-filter: blur(8px);
}
.site-mark {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 0 18px;
  border-right: var(--line);
  font-weight: 800;
}
.mark-block { width: 15px; height: 15px; background: var(--ink); }
.chapter-nav {
  min-width: 0;
  display: flex;
  overflow-x: auto;
  scrollbar-width: none;
}
.chapter-nav::-webkit-scrollbar { display: none; }
.chapter-nav a {
  position: relative;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 13px;
  font-size: 12px;
  white-space: nowrap;
}
.chapter-nav a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 9px;
  height: 3px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}
.chapter-nav a:hover::after,
.chapter-nav a[aria-current]::after { transform: scaleX(1); }
.chapter-nav a span { font-size: 9px; opacity: .55; }
.proposal-note {
  display: grid;
  place-items: center;
  padding: 0 18px;
  border-left: var(--line);
  font-size: 10px;
  letter-spacing: .08em;
}

.section {
  position: relative;
  min-height: 100svh;
  padding: var(--pad);
  border-bottom: var(--line);
  scroll-margin-top: var(--header-h);
  overflow: clip;
}
.section-kicker {
  display: flex;
  justify-content: space-between;
  padding-bottom: 11px;
  border-bottom: var(--line);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
}
.section-kicker.inverse { border-color: var(--white); }

.hero {
  min-height: calc(100svh - var(--header-h));
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--white);
  padding-top: 18px;
}
.hero-meta {
  display: flex;
  justify-content: space-between;
  align-items: start;
  padding-bottom: 14px;
  border-bottom: var(--line);
  font-size: clamp(11px, 1vw, 14px);
}
.hero-title {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 2vh 0;
  font-weight: 900;
  line-height: .78;
  letter-spacing: -.085em;
}
.hero-project {
  align-self: flex-end;
  margin-right: .03em;
  margin-bottom: .22em;
  font-size: clamp(22px, 3.2vw, 54px);
  letter-spacing: -.05em;
}
.hero-line { display: flex; align-items: flex-end; width: 100%; }
.hero-word {
  display: inline-block;
  font-size: clamp(86px, 18.2vw, 286px);
  white-space: nowrap;
  will-change: transform;
  transition: transform 220ms var(--ease);
}
.word-young { transform-origin: right center; }
.word-gather {
  margin-left: .04em;
  color: var(--yellow);
  -webkit-text-stroke: 1px var(--ink);
  paint-order: stroke fill;
}
.js [data-cluster] { opacity: 0; }
.js .hero-project { animation: gather-project 850ms 80ms var(--ease) forwards; }
.js .word-young { animation: gather-left 980ms 40ms var(--ease) forwards; }
.js .word-gather { animation: gather-right 980ms 90ms var(--ease) forwards; }
@keyframes gather-project { from { opacity: 0; transform: translate(36px, -14px); } to { opacity: 1; transform: translate(0); } }
@keyframes gather-left { from { opacity: 0; transform: translateX(-5vw); } to { opacity: 1; transform: translateX(0); } }
@keyframes gather-right { from { opacity: 0; transform: translate(5vw, 3vh); } to { opacity: 1; transform: translate(0); } }
.hero-bottom {
  display: grid;
  grid-template-columns: 2fr 1fr;
  align-items: end;
  border-top: var(--line);
}
.hero-lead {
  padding-top: 18px;
  font-size: clamp(19px, 2vw, 34px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -.04em;
}
.hero-index {
  min-height: 95px;
  display: flex;
  justify-content: space-between;
  align-items: end;
  padding: 14px 0 0 20px;
  border-left: var(--line);
  font-size: 11px;
  letter-spacing: .08em;
  background: linear-gradient(90deg, transparent 0 74%, var(--yellow) 74% 100%);
}
.scroll-cue {
  position: absolute;
  right: var(--pad);
  bottom: 18px;
  display: inline-flex;
  gap: 10px;
  align-items: center;
  padding-bottom: 4px;
  border-bottom: var(--line);
  font-size: 12px;
}

.idea-section { background: var(--paper); }
.idea-heading {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 5vw;
  align-items: end;
  padding: clamp(54px, 9vw, 132px) 0 42px;
}
.idea-heading h2,
.content-heading h2,
.rhythm-heading h2,
.reference-heading h2,
.cooperation-heading h2 {
  font-size: clamp(50px, 8.6vw, 132px);
  font-weight: 900;
  line-height: .88;
  letter-spacing: -.075em;
}
.statement {
  max-width: 18em;
  font-size: clamp(25px, 3.1vw, 50px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -.045em;
}
.idea-context {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  width: min(760px, 65%);
  margin-left: auto;
  padding: 22px 0 64px;
  border-top: var(--line);
  font-size: 15px;
  line-height: 1.65;
}
.concept-explorer { border-top: 5px solid var(--ink); }
.concept-list { display: grid; grid-template-columns: repeat(3, 1fr); }
.concept-key {
  position: relative;
  min-height: clamp(155px, 22vw, 300px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
  padding: clamp(14px, 2vw, 28px);
  background: transparent;
  border: 0;
  border-right: var(--line);
  text-align: left;
  cursor: pointer;
  transition: background 220ms ease, color 220ms ease;
}
.concept-key:last-child { border-right: 0; }
.concept-key span { font-size: 11px; }
.concept-key strong {
  font-size: clamp(34px, 5.4vw, 84px);
  line-height: .9;
  letter-spacing: -.07em;
}
.concept-key:hover,
.concept-key.is-active { background: var(--yellow); color: var(--ink); }
.concept-key:nth-child(2):hover,
.concept-key:nth-child(2).is-active { background: var(--cyan); color: var(--ink); }
.concept-key:nth-child(3):hover,
.concept-key:nth-child(3).is-active { background: var(--yellow); color: var(--ink); }
.concept-details { min-height: 178px; position: relative; background: var(--ink); color: var(--white); }
.concept-detail { padding: 28px; }
.js .concept-detail { display: none; }
.js .concept-detail.is-active { display: grid; grid-template-columns: 1fr 2fr; gap: 32px; align-items: end; }
.detail-code { font-size: 11px; letter-spacing: .1em; }
.concept-detail p { max-width: 19em; font-size: clamp(22px, 3vw, 43px); font-weight: 700; line-height: 1.18; letter-spacing: -.04em; }
.working-note { margin-top: 14px; font-size: 11px; line-height: 1.5; }

.tree-section { background: var(--ink); color: var(--white); }
.tree-grid {
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  grid-template-areas: "copy visual" "use visual" "condition condition";
  gap: 0;
  padding-top: clamp(48px, 7vw, 100px);
}
.tree-copy { grid-area: copy; padding: 0 7vw 54px 0; }
.tree-copy h2 { font-size: clamp(78px, 13vw, 200px); font-weight: 900; line-height: .78; letter-spacing: -.09em; }
.tree-lead { max-width: 17em; margin-top: 46px; font-size: clamp(21px, 2.3vw, 36px); font-weight: 700; line-height: 1.2; }
.tree-visual { grid-area: visual; min-height: 650px; }
.image-placeholder {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
  padding: 22px;
  background: var(--yellow);
  border: 0;
  color: var(--ink);
  text-align: left;
  cursor: zoom-in;
}
.placeholder-label,
.placeholder-action { position: relative; z-index: 2; font-size: 11px; letter-spacing: .08em; }
.placeholder-title { position: relative; z-index: 2; max-width: 6em; font-size: clamp(38px, 5vw, 76px); font-weight: 900; line-height: .88; letter-spacing: -.06em; }
.tree-symbol { position: absolute; inset: 12% -10% 8% 15%; }
.tree-symbol::before {
  content: "";
  position: absolute;
  left: 44%;
  bottom: 0;
  width: 12%;
  height: 54%;
  background: var(--ink);
}
.tree-symbol i { position: absolute; border: 5px solid var(--ink); background: var(--cyan); border-radius: 50%; }
.tree-symbol i:nth-child(1) { width: 52%; aspect-ratio: 1; top: 0; left: 11%; }
.tree-symbol i:nth-child(2) { width: 46%; aspect-ratio: 1; top: 10%; right: 4%; background: var(--yellow); }
.tree-symbol i:nth-child(3) { width: 44%; aspect-ratio: 1; top: 27%; left: 30%; background: var(--white); }
.tree-use {
  grid-area: use;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  align-content: end;
  padding: 30px 7vw 44px 0;
  border-top: 1px solid var(--white);
  font-size: 15px;
  line-height: 1.65;
}
.condition-note {
  grid-area: condition;
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  gap: 24px;
  align-items: start;
  margin-top: 54px;
  padding-top: 18px;
  border-top: 5px solid var(--white);
}
.condition-note span { font-size: 12px; font-weight: 800; }
.condition-note p { max-width: 38em; font-size: 18px; line-height: 1.5; }
.condition-note small { line-height: 1.5; opacity: .6; }

.content-section { background: var(--white); }
.content-heading {
  display: grid;
  grid-template-columns: 1.5fr .5fr;
  gap: 40px;
  align-items: end;
  padding: clamp(60px, 8vw, 110px) 0 48px;
}
.content-heading h2 { max-width: 8em; }
.content-heading p { padding-top: 16px; border-top: var(--line); font-size: 16px; line-height: 1.55; }
.scene-switcher { border: 5px solid var(--ink); }
.scene-tabs { display: grid; grid-template-columns: repeat(4, 1fr); border-bottom: var(--line); }
.scene-tab {
  min-height: 82px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  justify-content: space-between;
  padding: 16px;
  background: var(--white);
  border: 0;
  border-right: var(--line);
  font-size: 14px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease;
}
.scene-tab:last-child { border-right: 0; }
.scene-tab span { font-size: 11px; font-weight: 400; }
.scene-tab:hover,
.scene-tab.is-active { background: var(--ink); color: var(--white); }
.scene-stage { position: relative; min-height: 500px; }
.scene-panel { padding: 32px; }
.js .scene-panel { position: absolute; inset: 0; display: none; grid-template-columns: .32fr .95fr .73fr; gap: 30px; }
.js .scene-panel.is-active { display: grid; animation: scene-in 520ms var(--ease); }
@keyframes scene-in { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.scene-number { align-self: end; font-size: clamp(100px, 16vw, 240px); font-weight: 900; line-height: .75; letter-spacing: -.1em; }
.scene-copy { align-self: center; }
.scene-label { font-size: 10px; letter-spacing: .1em; }
.scene-copy h3 { margin: 22px 0 28px; font-size: clamp(38px, 5vw, 76px); line-height: .9; letter-spacing: -.06em; }
.scene-copy p { max-width: 35em; padding: 14px 0; border-top: var(--line); font-size: 15px; line-height: 1.6; }
.scene-diagram { position: relative; align-self: stretch; min-height: 340px; background: var(--yellow); border-left: var(--line); overflow: hidden; }
.scene-diagram span { position: absolute; display: grid; place-items: center; background: var(--white); border: var(--line); font-weight: 800; transition: transform 500ms var(--ease); }
.scene-diagram span:nth-child(1) { width: 52%; height: 28%; left: 8%; top: 10%; }
.scene-diagram span:nth-child(2) { width: 40%; height: 31%; right: 7%; top: 38%; }
.scene-diagram span:nth-child(3) { width: 58%; height: 23%; left: 11%; bottom: 7%; background: var(--yellow); color: var(--ink); }
.market-diagram { background: var(--cyan); }
.market-diagram span:nth-child(1) { transform: translate(55%, 190%); }
.market-diagram span:nth-child(2) { transform: translate(-80%, -70%); background: var(--ink); color: var(--white); }
.market-diagram span:nth-child(3) { transform: translate(40%, -210%); background: var(--white); color: var(--ink); }
.art-diagram { background: var(--yellow); }
.art-diagram span:nth-child(1) { width: 70%; transform: translate(20%, 20%); }
.art-diagram span:nth-child(2) { border-radius: 50%; transform: translate(-70%, 45%); }
.art-diagram span:nth-child(3) { transform: translate(35%, -30%); background: var(--cyan); color: var(--ink); }
.local-diagram { background: var(--blue); }
.local-diagram span:nth-child(1) { transform: translate(15%, 185%); }
.local-diagram span:nth-child(2) { transform: translate(-92%, 20%); background: var(--yellow); }
.local-diagram span:nth-child(3) { transform: translate(38%, -160%); }
.scene-disclaimer { padding: 10px 14px; border-top: var(--line); font-size: 10px; }

.school-feature {
  display: grid;
  grid-template-columns: 1fr 2.15fr;
  gap: 0 4vw;
  margin-top: clamp(80px, 12vw, 170px);
  padding-top: 18px;
  border-top: 5px solid var(--ink);
}
.feature-label { font-size: 11px; font-weight: 700; letter-spacing: .08em; }
.school-feature h3 {
  grid-column: 2;
  font-size: clamp(56px, 9.5vw, 150px);
  line-height: .86;
  letter-spacing: -.08em;
}
.skill-actions { grid-column: 2; display: grid; grid-template-columns: repeat(2, 1fr); margin-top: 54px; }
.skill-action {
  position: relative;
  padding: 20px 4px;
  background: transparent;
  border: 0;
  border-bottom: var(--line);
  text-align: left;
  font-weight: 800;
  cursor: pointer;
}
.skill-action:nth-child(odd) { margin-right: 20px; }
.skill-action::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 7px;
  background: var(--yellow);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 220ms ease;
}
.skill-action:hover::after,
.skill-action.is-active::after { transform: scaleX(1); }
.skill-result { grid-column: 2; min-height: 120px; padding: 28px; background: var(--yellow); }
.skill-result p { font-size: clamp(18px, 2.1vw, 30px); font-weight: 700; line-height: 1.3; }
.js .skill-result p { display: none; }
.js .skill-result p.is-active { display: block; animation: result-in 400ms var(--ease); }
@keyframes result-in { from { opacity: 0; transform: translateX(14px); } to { opacity: 1; transform: translateX(0); } }
.price-note { grid-column: 2; margin-top: 12px; font-size: 11px; }

.open-day { margin: clamp(80px, 11vw, 150px) 0; }
.open-day ol { list-style: none; margin: 18px 0 12px; padding: 0; border-top: 5px solid var(--ink); }
.open-day li { display: grid; grid-template-columns: .45fr 1.55fr; gap: 30px; padding: 22px 0; border-bottom: var(--line); }
.open-day li span { font-size: clamp(34px, 5vw, 78px); font-weight: 900; letter-spacing: -.07em; }
.open-day li p { align-self: center; max-width: 42em; font-size: clamp(17px, 1.7vw, 25px); font-weight: 700; }
.open-day small { opacity: .65; }

.visual-strip-wrap { margin-left: calc(var(--pad) * -1); margin-right: calc(var(--pad) * -1); }
.strip-head { display: flex; justify-content: space-between; align-items: end; padding: 0 var(--pad) 18px; }
.strip-head h3 { margin-top: 8px; font-size: clamp(27px, 3vw, 46px); letter-spacing: -.05em; }
.strip-controls { display: flex; align-items: center; gap: 8px; }
.strip-position { margin-right: 12px; font-size: 11px; }
.strip-controls button { width: 42px; height: 42px; background: var(--white); border: var(--line); cursor: pointer; }
.strip-controls button:hover { background: var(--ink); color: var(--white); }
.visual-strip { display: flex; overflow-x: auto; overscroll-behavior-x: contain; scroll-snap-type: x mandatory; scrollbar-width: none; cursor: grab; border-top: var(--line); border-bottom: var(--line); }
.visual-strip::-webkit-scrollbar { display: none; }
.visual-strip.is-dragging { cursor: grabbing; scroll-snap-type: none; }
.visual-tile {
  position: relative;
  flex: 0 0 min(42vw, 590px);
  min-height: 430px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: flex-start;
  gap: 10px;
  padding: 24px;
  border: 0;
  border-right: var(--line);
  text-align: left;
  scroll-snap-align: start;
  cursor: zoom-in;
}
.visual-tile > span { position: absolute; top: 20px; left: 20px; font-size: 11px; }
.visual-tile strong { max-width: 6em; font-size: clamp(38px, 5vw, 76px); line-height: .87; letter-spacing: -.065em; }
.visual-tile small { padding-top: 12px; border-top: 1px solid currentColor; font-size: 11px; letter-spacing: .05em; }
.tone-black { background: var(--ink); color: var(--white); }
.tone-yellow { background: var(--yellow); }
.tone-paper { background: var(--paper); }
.tone-cyan { background: var(--cyan); }
.tone-yellow { background: linear-gradient(90deg, var(--yellow) 0 34%, var(--lime) 34% 67%, #fff6a4 67%); }
.tone-blue { background: var(--blue); color: var(--white); }

.image-placeholder::after,
.visual-tile::after,
.scene-diagram::after,
.reference-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .18;
  background-image: var(--film-grain);
  background-size: 180px 180px;
  mix-blend-mode: soft-light;
}
.reference-card { position: relative; }

.rhythm-section { background: var(--paper); }
.rhythm-heading { display: grid; grid-template-columns: 1.35fr .65fr; gap: 40px; align-items: end; padding: clamp(70px, 10vw, 150px) 0; }
.rhythm-heading p { max-width: 18em; font-size: clamp(21px, 2.5vw, 38px); font-weight: 700; line-height: 1.25; }
.timeline { --line-progress: 12%; position: relative; width: min(100%, 1040px); margin-left: auto; }
.timeline-line { position: absolute; top: 0; bottom: 0; left: 48px; width: 5px; background: #d3d0c7; }
.timeline-line span { display: block; width: 100%; height: var(--line-progress); background: var(--yellow); transition: height 600ms var(--ease); }
.timeline-step { position: relative; display: grid; grid-template-columns: 100px 1fr; gap: 30px; min-height: 240px; padding: 12px 0 56px; opacity: .35; transition: opacity 300ms ease; }
.timeline-step.is-active { opacity: 1; }
.step-index { position: relative; z-index: 2; width: 48px; height: 48px; display: grid; place-items: center; background: var(--paper); border: 4px solid var(--ink); border-radius: 50%; font-size: 11px; font-weight: 800; }
.timeline-step.is-active .step-index { background: var(--yellow); color: var(--ink); }
.timeline-step h3 { font-size: clamp(40px, 6.5vw, 96px); line-height: .9; letter-spacing: -.07em; }
.timeline-step p { max-width: 38em; margin-top: 22px; padding-top: 12px; border-top: var(--line); font-size: clamp(16px, 1.7vw, 24px); line-height: 1.45; }
.rhythm-note { width: min(100%, 940px); margin: 0 0 0 auto; padding: 18px; background: var(--yellow); font-size: 13px; font-weight: 700; line-height: 1.5; }

.reference-section { background: var(--ink); color: var(--white); }
.reference-heading { display: grid; grid-template-columns: 1.35fr .65fr; gap: 40px; align-items: end; padding: clamp(70px, 9vw, 130px) 0 60px; }
.reference-heading p { max-width: 25em; padding-top: 14px; border-top: 1px solid var(--white); font-size: 14px; line-height: 1.6; }
.reference-grid { display: grid; grid-template-columns: repeat(2, 1fr); border: 1px solid var(--white); }
.reference-card { min-height: 360px; display: grid; grid-template-rows: auto 1fr auto; padding: 24px; border-right: 1px solid var(--white); border-bottom: 1px solid var(--white); }
.reference-card:nth-child(even) { border-right: 0; }
.reference-card:nth-child(n+3) { border-bottom: 0; }
.reference-card > span,
.reference-card small { font-size: 10px; letter-spacing: .1em; }
.reference-card h3 { align-self: end; font-size: clamp(50px, 8vw, 125px); line-height: .82; letter-spacing: -.08em; }
.reference-card p { max-width: 27em; margin-top: 28px; font-size: 16px; line-height: 1.55; }
.reference-card small { align-self: end; justify-self: end; padding-top: 30px; }
.accent-yellow { background: var(--yellow); color: var(--ink); }
.accent-cyan { background: var(--cyan); color: var(--ink); }
.accent-yellow { background: var(--yellow); color: var(--ink); }
.reference-close { margin-top: 80px; margin-left: auto; max-width: 18em; font-size: clamp(28px, 4vw, 60px); font-weight: 700; line-height: 1.18; letter-spacing: -.05em; }

.cooperation-section { background: var(--white); }
.cooperation-heading { display: grid; grid-template-columns: 1.3fr .7fr; gap: 40px; align-items: end; padding: clamp(70px, 10vw, 150px) 0 70px; }
.cooperation-heading p { font-size: clamp(22px, 2.7vw, 42px); font-weight: 700; line-height: 1.22; letter-spacing: -.04em; }
.roles-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 5px solid var(--ink); }
.role-block { min-height: 390px; display: grid; grid-template-rows: auto 1fr auto; padding: 22px; border-right: var(--line); }
.role-block:last-child { border-right: 0; }
.role-block > span { font-size: 10px; letter-spacing: .1em; }
.role-block h3 { align-self: end; font-size: clamp(40px, 5.5vw, 82px); line-height: .88; letter-spacing: -.07em; }
.role-block p { margin-top: 28px; padding-top: 14px; border-top: 1px solid currentColor; font-size: 15px; line-height: 1.55; }
.role-block.dark { background: var(--ink); color: var(--white); }
.role-block.yellow { background: var(--yellow); }
.conditions { display: grid; grid-template-columns: .75fr 1.25fr; margin-top: clamp(70px, 10vw, 130px); border-top: 5px solid var(--ink); }
.conditions-title { display: flex; flex-direction: column; justify-content: space-between; min-height: 320px; padding: 18px 28px 0 0; border-right: var(--line); }
.conditions-title span { font-weight: 800; }
.conditions-title strong { font-size: clamp(100px, 17vw, 260px); line-height: .68; letter-spacing: -.1em; }
.conditions ol { list-style: none; margin: 0; padding: 0 0 0 28px; }
.conditions li { display: grid; grid-template-columns: 50px 1fr; gap: 20px; align-items: center; min-height: 90px; border-bottom: var(--line); font-size: clamp(16px, 1.7vw, 24px); font-weight: 700; }
.conditions li span { font-size: 11px; font-weight: 400; }
.boundary-note { margin-top: 18px; margin-left: auto; max-width: 48em; font-size: 12px; line-height: 1.55; }

.ending-section { min-height: calc(100svh - var(--header-h)); display: flex; flex-direction: column; justify-content: space-between; background: var(--yellow); }
.ending-meta { display: flex; justify-content: space-between; padding-bottom: 12px; border-bottom: var(--line); font-size: 10px; letter-spacing: .1em; }
.gather-stage { position: relative; display: grid; place-items: center; flex: 1; min-height: 58vh; }
.gather-stage h2 { position: relative; z-index: 2; font-size: clamp(61px, 11.2vw, 180px); line-height: .86; letter-spacing: -.085em; text-align: center; }
.gather-button { display: inline; padding: 0 .02em; background: var(--yellow); border: 0; color: var(--ink); font-size: inherit; font-weight: inherit; line-height: inherit; letter-spacing: inherit; cursor: pointer; }
.gather-button:hover { background: var(--ink); }
.gather-word { position: absolute; padding: 8px 12px; border: var(--line); background: var(--white); font-size: 13px; font-weight: 800; transition: transform 500ms var(--ease); }
.word-learning { left: 8%; top: 20%; }
.word-reading { right: 9%; top: 18%; background: var(--cyan); }
.word-making { left: 13%; bottom: 16%; background: var(--yellow); color: var(--ink); }
.word-talking { right: 12%; bottom: 12%; }
.gather-stage.is-gathered .word-learning { transform: translate(24vw, 15vh); }
.gather-stage.is-gathered .word-reading { transform: translate(-25vw, 16vh); }
.gather-stage.is-gathered .word-making { transform: translate(23vw, -15vh); }
.gather-stage.is-gathered .word-talking { transform: translate(-24vw, -15vh); }
.ending-copy { max-width: 30em; padding-top: 18px; border-top: var(--line); font-size: clamp(18px, 2vw, 30px); font-weight: 700; line-height: 1.35; }
.back-top { position: absolute; right: var(--pad); bottom: var(--pad); padding-bottom: 4px; border-bottom: var(--line); font-size: 12px; }

.lightbox {
  width: min(920px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  padding: 0;
  background: var(--paper);
  border: 5px solid var(--ink);
  color: var(--ink);
}
.lightbox::backdrop { background: rgba(0,0,0,.78); }
.lightbox-toolbar { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px; border-bottom: var(--line); font-size: 10px; letter-spacing: .1em; }
.lightbox-toolbar button { background: transparent; border: 0; cursor: pointer; font-weight: 800; }
.lightbox-canvas { position: relative; min-height: min(54vh, 510px); overflow: hidden; background: var(--yellow); }
.lightbox-canvas::before,
.lightbox-canvas::after,
.lightbox-canvas span { content: ""; position: absolute; background: var(--ink); }
.lightbox-canvas::before { width: 42%; height: 42%; top: 12%; left: 12%; }
.lightbox-canvas::after { width: 35%; height: 55%; right: 11%; bottom: 9%; background: var(--cyan); border: 5px solid var(--ink); }
.lightbox-canvas span { width: 27%; height: 23%; left: 39%; bottom: 13%; background: var(--yellow); border: 5px solid var(--ink); }
.lightbox-copy { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; padding: 20px; }
.lightbox-copy h2 { font-size: clamp(32px, 5vw, 64px); line-height: .92; letter-spacing: -.06em; }
.lightbox-copy p { line-height: 1.6; }

.js .reveal-block { opacity: 0; transform: translateY(22px); transition: opacity 600ms var(--ease), transform 600ms var(--ease); }
.js .reveal-block.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 980px) {
  .site-header { grid-template-columns: 140px 1fr; }
  .proposal-note { display: none; }
  .hero-word { font-size: clamp(80px, 17.5vw, 180px); }
  .idea-heading,
  .content-heading,
  .rhythm-heading,
  .reference-heading,
  .cooperation-heading { grid-template-columns: 1fr; }
  .idea-context { width: 80%; }
  .tree-grid { grid-template-columns: 1fr 1fr; }
  .tree-visual { min-height: 520px; }
  .js .scene-panel { grid-template-columns: .25fr 1fr; }
  .scene-diagram { display: none; }
  .visual-tile { flex-basis: 58vw; }
}

@media (max-width: 720px) {
  :root { --header-h: 52px; --pad: 18px; }
  .site-header { grid-template-columns: 108px 1fr; }
  .site-mark { padding: 0 10px; font-size: 13px; }
  .chapter-nav a { min-width: 44px; justify-content: center; padding: 0 10px; font-size: 0; }
  .chapter-nav a span { font-size: 10px; opacity: 1; }
  .section { min-height: auto; }
  .hero { min-height: calc(100svh - var(--header-h)); }
  .hero-meta { gap: 10px; }
  .hero-meta p:last-child { text-align: right; }
  .hero-title { justify-content: center; }
  .hero-project { font-size: 22px; }
  .hero-line { flex-direction: column; align-items: flex-start; }
  .hero-word { font-size: clamp(82px, 26vw, 126px); line-height: .82; }
  .word-gather { align-self: flex-end; margin: .08em 0 0; font-size: clamp(72px, 22vw, 96px); }
  .hero-bottom { grid-template-columns: 1fr; padding-bottom: 52px; }
  .hero-lead { font-size: 19px; }
  .hero-index { display: none; }
  .scroll-cue { left: var(--pad); right: auto; bottom: 17px; }

  .idea-heading { padding-top: 60px; }
  .idea-heading h2,
  .content-heading h2,
  .rhythm-heading h2,
  .reference-heading h2,
  .cooperation-heading h2 { font-size: 51px; }
  .statement { font-size: 26px; }
  .idea-context { width: 100%; grid-template-columns: 1fr; padding-bottom: 42px; }
  .concept-list { grid-template-columns: 1fr; }
  .concept-key { min-height: 110px; border-right: 0; border-bottom: var(--line); }
  .concept-key strong { font-size: 43px; }
  .concept-details { min-height: 210px; }
  .js .concept-detail.is-active { grid-template-columns: 1fr; }

  .tree-grid { grid-template-columns: 1fr; grid-template-areas: "copy" "visual" "use" "condition"; }
  .tree-copy { padding-right: 0; }
  .tree-copy h2 { font-size: 91px; }
  .tree-visual { min-height: 480px; }
  .tree-use { grid-template-columns: 1fr; padding-right: 0; }
  .condition-note { grid-template-columns: 1fr; }

  .content-heading { padding-top: 60px; }
  .scene-tabs { display: flex; overflow-x: auto; }
  .scene-tab { flex: 0 0 175px; }
  .scene-stage { min-height: 560px; }
  .js .scene-panel { grid-template-columns: 1fr; padding: 22px; }
  .scene-number { font-size: 104px; align-self: start; }
  .scene-copy { align-self: end; }
  .scene-copy h3 { font-size: 43px; }
  .school-feature { grid-template-columns: 1fr; }
  .school-feature h3,
  .skill-actions,
  .skill-result,
  .price-note { grid-column: 1; }
  .school-feature h3 { margin-top: 50px; font-size: 57px; }
  .skill-actions { grid-template-columns: 1fr; margin-top: 40px; }
  .skill-action:nth-child(odd) { margin-right: 0; }
  .skill-result { min-height: 160px; }
  .open-day li { grid-template-columns: 1fr; gap: 8px; }
  .visual-tile { flex-basis: 84vw; min-height: 430px; }
  .strip-head { align-items: start; gap: 20px; }
  .strip-position { display: none; }

  .rhythm-heading { padding: 70px 0; }
  .timeline-line { left: 24px; }
  .timeline-step { grid-template-columns: 68px 1fr; gap: 14px; min-height: 260px; }
  .step-index { width: 48px; }
  .timeline-step h3 { font-size: 47px; }
  .reference-grid { grid-template-columns: 1fr; }
  .reference-card { min-height: 320px; border-right: 0; border-bottom: 1px solid var(--white) !important; }
  .reference-card:last-child { border-bottom: 0 !important; }
  .reference-card h3 { font-size: 64px; }
  .roles-grid { grid-template-columns: 1fr; }
  .role-block { min-height: 300px; border-right: 0; border-bottom: var(--line); }
  .role-block:last-child { border-bottom: 0; }
  .conditions { grid-template-columns: 1fr; }
  .conditions-title { min-height: 230px; border-right: 0; border-bottom: var(--line); padding-right: 0; }
  .conditions ol { padding-left: 0; }
  .conditions li { grid-template-columns: 34px 1fr; }
  .gather-stage { min-height: 66vh; }
  .gather-stage h2 { font-size: clamp(46px, 13.2vw, 54px); line-height: .94; }
  .gather-word { font-size: 11px; }
  .word-learning { left: 0; top: 22%; }
  .word-reading { right: 0; top: 18%; }
  .word-making { left: 4%; bottom: 18%; }
  .word-talking { right: 2%; bottom: 13%; }
  .gather-stage.is-gathered .word-learning { transform: translate(27vw, 17vh); }
  .gather-stage.is-gathered .word-reading { transform: translate(-27vw, 18vh); }
  .gather-stage.is-gathered .word-making { transform: translate(25vw, -18vh); }
  .gather-stage.is-gathered .word-talking { transform: translate(-26vw, -20vh); }
  .ending-copy { padding-right: 80px; font-size: 18px; }
  .lightbox-copy { grid-template-columns: 1fr; }
}

@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-cluster] { opacity: 1; }
  .js .reveal-block { opacity: 1; transform: none; }
}