:root {
  /* Compliance phrase: Interprets “tsundere” as an isometric emotional dungeon where denial and affection become architectural rooms; Roboto Slab** primary slab-serif voice for chapter titles. */
  --obsidian: #080712;
  --red: #FF2D6D;
  --cyan: #16F4FF;
  --marble: #F4EFE6;
  --violet: #4B2C88;
  --peach: #FFB08A;
  --gold: #D6A84F;
  --ink: #1D1730;
  --slab: "Roboto Slab", Roboto, Georgia, serif;
  --dialogue: "Bricolage Grotesque", Inter, Roboto, system-ui, sans-serif;
  --jp: "Noto Serif JP", serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--obsidian);
  color: var(--marble);
  font-family: var(--dialogue);
  overflow-x: hidden;
}

.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 16% 12%, rgba(255, 45, 109, .22), transparent 28%),
    radial-gradient(circle at 84% 34%, rgba(22, 244, 255, .20), transparent 30%),
    radial-gradient(circle at 52% 78%, rgba(75, 44, 136, .45), transparent 36%),
    linear-gradient(135deg, #080712 0%, #1D1730 52%, #080712 100%);
  z-index: -3;
}

.ambient::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .13;
  background-image:
    linear-gradient(30deg, transparent 47%, rgba(244, 239, 230, .45) 49%, transparent 51%),
    linear-gradient(150deg, transparent 47%, rgba(22, 244, 255, .28) 49%, transparent 51%);
  background-size: 96px 96px;
}

.route-progress {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 20;
}

.route-dot {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 2px solid var(--marble);
  background: var(--ink);
  box-shadow: 0 0 0 transparent;
  transition: .45s ease;
}

.route-dot.active {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 18px var(--cyan), 0 0 36px rgba(22, 244, 255, .45);
}

.route-line {
  width: 2px;
  height: 54px;
  background: linear-gradient(var(--violet), var(--cyan));
  opacity: .55;
}

.inventory {
  position: fixed;
  left: 18px;
  top: 18px;
  z-index: 30;
  width: 188px;
  padding: 14px;
  color: var(--ink);
  background: linear-gradient(145deg, rgba(244, 239, 230, .94), rgba(255, 176, 138, .78));
  border: 2px solid rgba(214, 168, 79, .9);
  box-shadow: 12px 12px 0 rgba(75, 44, 136, .55), 0 0 28px rgba(255, 45, 109, .22);
  transform: skewY(-5deg);
}

.inventory-title {
  font-family: var(--slab);
  font-weight: 800;
  font-size: .76rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.token {
  display: block;
  width: 100%;
  margin: 7px 0;
  padding: 8px;
  border: 1px solid rgba(29, 23, 48, .36);
  background: rgba(244, 239, 230, .52);
  color: var(--ink);
  font: 700 .72rem var(--dialogue);
  text-align: left;
  cursor: pointer;
  transition: transform .3s ease, background .3s ease, box-shadow .3s ease;
}

.token span { color: var(--red); margin-right: 5px; }
.token:hover, .token.active { transform: translateY(-4px); background: var(--marble); box-shadow: 0 0 14px rgba(22, 244, 255, .65); }

.room {
  min-height: 100vh;
  position: relative;
  padding: 7rem clamp(1rem, 4vw, 5rem) 4rem;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.scene {
  width: min(1120px, 94vw);
  min-height: 660px;
  position: relative;
  transform-style: preserve-3d;
  perspective: 1200px;
}

.scene::before {
  content: "";
  position: absolute;
  inset: 16% 7% 12% 7%;
  transform: rotateX(60deg) rotateZ(-35deg);
  background:
    linear-gradient(45deg, rgba(29,23,48,.72) 25%, transparent 25% 75%, rgba(29,23,48,.72) 75%),
    linear-gradient(45deg, transparent 25%, rgba(244,239,230,.20) 25% 75%, transparent 75%);
  background-size: 66px 66px;
  border: 2px solid rgba(244, 239, 230, .38);
  box-shadow: 0 0 48px rgba(22, 244, 255, .16), inset 0 0 60px rgba(75, 44, 136, .55);
  opacity: .82;
}

.margin-note {
  position: absolute;
  right: 70px;
  top: 22%;
  writing-mode: vertical-rl;
  font-family: var(--jp);
  color: var(--peach);
  letter-spacing: .18em;
  z-index: 5;
  text-shadow: 0 0 12px var(--red);
}

.eyebrow {
  font: 800 .78rem var(--slab);
  color: var(--gold);
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1, h2 {
  margin: .22em 0;
  font-family: var(--slab);
  line-height: .96;
  color: var(--marble);
  text-shadow: 3px 3px 0 var(--violet), 0 0 18px rgba(22,244,255,.24);
}

h1 { font-size: clamp(3.4rem, 9vw, 8.5rem); }
h2 { font-size: clamp(2.2rem, 5.4vw, 5.8rem); }
p { line-height: 1.55; }

.balcony, .chapter-plaque {
  position: absolute;
  z-index: 4;
  padding: 24px 28px;
  background: linear-gradient(135deg, rgba(29,23,48,.96), rgba(75,44,136,.82));
  border: 2px solid rgba(244, 239, 230, .62);
  box-shadow: 18px 18px 0 rgba(8, 7, 18, .7), 0 0 28px rgba(255,45,109,.20);
}

.balcony { top: 5%; left: 2%; width: min(560px, 78vw); transform: rotate(-3deg); }
.chapter-plaque { max-width: 520px; }
.plaque-lift { transition: transform .45s cubic-bezier(.2,1.45,.33,1), box-shadow .45s; }
.plaque-lift:hover { transform: translateY(-12px) rotate(-2deg); box-shadow: 24px 28px 0 rgba(8, 7, 18, .78), 0 0 34px rgba(22,244,255,.35); }

.iso-gate {
  position: absolute;
  right: 8%;
  top: 20%;
  width: 360px;
  height: 390px;
  transform: rotateX(58deg) rotateZ(32deg) translateZ(10px);
  transform-style: preserve-3d;
  z-index: 3;
}

.gate-lintel, .gate-base {
  position: absolute;
  left: 0;
  right: 0;
  background: linear-gradient(135deg, var(--marble), #cfc6ba);
  color: var(--ink);
  border: 3px solid rgba(29, 23, 48, .8);
  text-align: center;
  font-family: var(--slab);
  font-weight: 800;
  letter-spacing: .08em;
  box-shadow: 0 0 22px rgba(22,244,255,.25);
}

.gate-lintel { top: 0; padding: 18px; }
.gate-base { bottom: 0; padding: 13px; color: var(--red); }

.gate-doors {
  position: absolute;
  top: 62px;
  bottom: 52px;
  left: 38px;
  right: 38px;
  background: linear-gradient(90deg, #ded8ce 0 48%, #968ba8 49% 51%, #e9e2d8 52%);
  border: 3px solid var(--ink);
  overflow: hidden;
}

.crack {
  position: absolute;
  width: 4px;
  background: var(--cyan);
  box-shadow: 0 0 16px var(--cyan), 0 0 32px var(--red);
  transform-origin: top;
  opacity: .25;
  transition: opacity .4s ease, height .9s ease;
}

.crack-one { left: 48%; top: 8%; height: 40%; transform: rotate(14deg); }
.crack-two { left: 54%; top: 30%; height: 25%; transform: rotate(-37deg); background: var(--red); }
.crack-three { left: 44%; top: 48%; height: 34%; transform: rotate(31deg); }
body.gate-awake .crack { opacity: 1; height: 76%; }

.speech {
  position: absolute;
  z-index: 7;
  max-width: 310px;
  padding: 16px 18px;
  color: var(--ink);
  background: var(--marble);
  border: 3px solid var(--ink);
  border-radius: 24px 24px 24px 4px;
  font-weight: 800;
  box-shadow: 9px 9px 0 var(--red), 0 0 22px rgba(22,244,255,.35);
  transform: scale(.82) translateY(12px);
  opacity: 0;
  transition: .5s cubic-bezier(.2,1.5,.35,1);
}

.speech small, .choice-tile span, .treasure-token span, .hover-reveal small {
  display: block;
  margin-top: 8px;
  color: var(--violet);
  font-weight: 700;
}

body.gate-awake .bubble-intro, .room.in-view .speech { opacity: 1; transform: scale(1) translateY(0); }
.bubble-intro { right: 14%; bottom: 18%; }

.route-stone, .mosaic {
  position: absolute;
  height: 18px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--red), transparent);
  filter: drop-shadow(0 0 16px var(--cyan));
  transform: rotate(-25deg);
  z-index: 2;
  animation: pulseRoute 2s infinite alternate;
}
.route-a { width: 50%; left: 25%; bottom: 18%; }

.z-right .chapter-plaque { right: 3%; top: 9%; transform: rotate(2deg); }
.path-split { position: absolute; left: 10%; top: 34%; z-index: 5; display: grid; gap: 22px; transform: rotate(-9deg); }
.choice-tile {
  width: 300px;
  padding: 18px;
  background: linear-gradient(135deg, var(--marble), #d8d0c5);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 12px 12px 0 rgba(22,244,255,.25);
}

.hover-reveal { transition: transform .45s cubic-bezier(.2,1.45,.33,1), filter .35s, box-shadow .35s; }
.hover-reveal:hover, .hover-reveal.lifted { transform: translateY(-16px) rotate(-1deg) scale(1.03); filter: saturate(1.25); box-shadow: 16px 20px 0 rgba(255,45,109,.35), 0 0 28px rgba(22,244,255,.42); }

.portrait-plaque {
  position: absolute;
  right: 14%;
  bottom: 12%;
  z-index: 6;
  width: 220px;
  padding: 12px;
  margin: 0;
  color: var(--ink);
  background: var(--marble);
  border: 8px solid var(--gold);
  transform: rotate(10deg);
}
.portrait-face {
  height: 190px;
  background:
    radial-gradient(circle at 50% 35%, rgba(244,239,230,.95) 0 20%, transparent 21%),
    radial-gradient(circle at 42% 34%, var(--red) 0 2%, transparent 3%),
    radial-gradient(circle at 59% 35%, var(--cyan) 0 2%, transparent 3%),
    linear-gradient(140deg, rgba(214,168,79,.55), rgba(29,23,48,.86)),
    repeating-linear-gradient(0deg, rgba(8,7,18,.18) 0 2px, transparent 2px 5px);
  filter: sepia(.55) contrast(1.15);
}
.portrait-plaque figcaption { margin-top: 10px; font: 700 .78rem var(--dialogue); }
.mosaic-one { width: 54%; right: 18%; bottom: 27%; }

.statue-field { position: absolute; inset: 11% 6%; z-index: 5; }
.bust {
  position: absolute;
  width: 170px;
  height: 245px;
  background: linear-gradient(145deg, var(--marble), #aaa0b5);
  border: 3px solid var(--ink);
  box-shadow: 14px 18px 0 rgba(75,44,136,.55);
}
.bust span {
  position: absolute;
  top: 28px;
  left: 39px;
  width: 92px;
  height: 102px;
  border-radius: 48% 42% 50% 45%;
  background: radial-gradient(circle at 71% 42%, var(--red) 0 8%, transparent 9%), linear-gradient(var(--marble), #d3cbc1);
  border: 2px solid var(--ink);
}
.bust em { position: absolute; bottom: 18px; left: 18px; right: 18px; color: var(--red); font: 800 .86rem var(--slab); }
.bust-left { left: 6%; top: 7%; transform: rotate(-12deg); }
.bust-right { right: 8%; bottom: 6%; transform: rotate(10deg); }
.stair { position: absolute; width: 280px; height: 90px; background: repeating-linear-gradient(90deg, var(--marble) 0 36px, #bcb2c9 36px 42px); border: 3px solid var(--ink); transform: rotateX(60deg) rotateZ(-34deg); box-shadow: 0 0 22px rgba(22,244,255,.35); }
.stair-one { left: 28%; top: 22%; }
.stair-two { right: 30%; bottom: 22%; }
.speech-one { left: 39%; top: 37%; opacity: 1; transform: rotate(4deg); }
.trial-plaque { left: 8%; bottom: 2%; transform: rotate(-3deg); }
.mosaic-two { width: 68%; left: 15%; top: 48%; }

.folding-map {
  position: absolute;
  left: 12%;
  top: 18%;
  width: 660px;
  height: 360px;
  z-index: 4;
  transform: rotateX(57deg) rotateZ(-32deg);
  transform-style: preserve-3d;
}
.map-wing {
  position: absolute;
  top: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(135deg, var(--marble), #cfc6ba 55%, var(--peach));
  border: 3px solid var(--ink);
  transition: transform 1.2s cubic-bezier(.2,1,.24,1);
}
.left-wing { left: 0; transform-origin: right center; }
.right-wing { right: 0; transform-origin: left center; }
.treasure-room.in-view .left-wing { transform: rotateY(-22deg); }
.treasure-room.in-view .right-wing { transform: rotateY(22deg); }
.heart-route {
  position: absolute;
  left: 237px;
  top: 88px;
  width: 190px;
  height: 190px;
  transform: rotate(45deg);
  background: var(--red);
  box-shadow: 0 0 34px var(--red), 0 0 58px rgba(22,244,255,.45);
  opacity: .88;
}
.heart-route::before, .heart-route::after { content: ""; position: absolute; width: 190px; height: 190px; border-radius: 50%; background: var(--red); }
.heart-route::before { left: -95px; }
.heart-route::after { top: -95px; }
.treasure-plaque { right: 3%; top: 14%; transform: rotate(3deg); }
.inscription { font-family: var(--slab); color: var(--gold); font-size: 1.3rem; }
.sincere { color: var(--cyan); opacity: 0; transform: translateY(8px); transition: .8s ease; }
.treasure-room.sincere .sincere { opacity: 1; transform: translateY(0); }
.treasure-token {
  position: absolute;
  right: 18%;
  bottom: 20%;
  z-index: 8;
  width: 150px;
  height: 150px;
  display: grid;
  place-items: center;
  border-radius: 28px;
  color: var(--gold);
  background: linear-gradient(135deg, var(--ink), var(--violet));
  border: 2px solid var(--gold);
  font: 800 3rem var(--slab);
  text-align: center;
  box-shadow: 0 0 32px rgba(214,168,79,.45);
}
.treasure-token span { font-size: .72rem; color: var(--marble); }
.final-bubble { left: 22%; bottom: 13%; opacity: 1; transform: rotate(-4deg); }

@keyframes pulseRoute { from { opacity: .45; } to { opacity: 1; } }

@media (max-width: 820px) {
  .inventory { position: fixed; width: 150px; transform: scale(.88) skewY(-5deg); transform-origin: left top; }
  .route-progress { right: 10px; }
  .room { padding: 8rem 1rem 3rem; }
  .scene { min-height: 760px; }
  .balcony, .chapter-plaque { left: 4%; right: auto; max-width: 82vw; }
  .iso-gate { width: 265px; height: 300px; right: 6%; top: 38%; }
  .path-split { left: 4%; top: 38%; }
  .choice-tile { width: 250px; }
  .portrait-plaque { right: 8%; bottom: 5%; width: 170px; }
  .folding-map { left: -10%; width: 500px; }
  .treasure-plaque { top: 5%; }
  .margin-note { right: 32px; }
}