:root {
  --charred: #2E2B26;
  --plaster: #E4D6B8;
  --taupe: #8D7D68;
  --rust: #A26A4E;
  --green: #6F8A7A;
  --bubble: #9BB7BC;
  --amber: #D89F7A;
  --display: "Barlow Condensed", "Arial Narrow", Impact, sans-serif;
  --label: "IBM Plex Sans Condensed", "Arial Narrow", sans-serif;
  --body: "Noto Sans JP", Inter, system-ui, sans-serif;
  --design-token-condensed: "Condensed**";
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--plaster);
}

body {
  margin: 0;
  color: var(--charred);
  background:
    radial-gradient(circle at 78% 16%, rgba(216, 159, 122, .22) 0 7rem, transparent 15rem),
    radial-gradient(circle at 12% 48%, rgba(155, 183, 188, .21) 0 6rem, transparent 17rem),
    linear-gradient(100deg, rgba(141, 125, 104, .18), transparent 34%, rgba(111, 138, 122, .1)),
    var(--plaster);
  font-family: var(--body);
  overflow-x: hidden;
}

.grain,
.tile-seams {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.grain {
  opacity: .38;
  background-image:
    radial-gradient(circle at 12% 18%, rgba(46, 43, 38, .16) 0 1px, transparent 1.8px),
    radial-gradient(circle at 72% 62%, rgba(162, 106, 78, .13) 0 1px, transparent 2px),
    radial-gradient(circle at 42% 82%, rgba(141, 125, 104, .14) 0 1px, transparent 2px);
  background-size: 37px 43px, 53px 59px, 29px 31px;
  mix-blend-mode: multiply;
}

.tile-seams {
  opacity: .26;
  background:
    linear-gradient(90deg, transparent 0 12.2vw, rgba(46,43,38,.22) 12.28vw 12.36vw, transparent 12.45vw 28vw, rgba(46,43,38,.15) 28.08vw 28.18vw, transparent 28.24vw),
    linear-gradient(0deg, transparent 0 16.6vh, rgba(46,43,38,.16) 16.72vh 16.82vh, transparent 16.9vh 39vh, rgba(46,43,38,.23) 39.08vh 39.18vh, transparent 39.3vh);
  background-size: 41vw 100vh, 100vw 53vh;
}

.depth-ruler {
  position: fixed;
  left: 1.2rem;
  top: 6vh;
  bottom: 6vh;
  width: 4.8rem;
  z-index: 7;
  font-family: var(--label);
  color: var(--taupe);
}

.ruler-track {
  position: absolute;
  left: 2rem;
  top: 0;
  bottom: 0;
  border-left: 2px solid rgba(46, 43, 38, .44);
}

.tick {
  position: absolute;
  left: .8rem;
  transform: rotate(90deg);
  transform-origin: left center;
  text-transform: uppercase;
  letter-spacing: .12em;
  font-size: .85rem;
  white-space: nowrap;
  transition: color .4s ease, transform .4s ease;
}

.tick::before {
  content: "";
  position: absolute;
  left: -1.7rem;
  top: .55rem;
  width: 1rem;
  border-top: 1px solid currentColor;
}

.tick:nth-child(1) { top: 0; }
.tick:nth-child(2) { top: 24%; }
.tick:nth-child(3) { top: 48%; }
.tick:nth-child(4) { top: 72%; }
.tick:nth-child(5) { top: 94%; }
.tick.active { color: var(--rust); transform: rotate(90deg) translateX(4px); }

.ruler-current {
  position: absolute;
  bottom: -2.2rem;
  left: 0;
  writing-mode: vertical-rl;
  font-family: var(--display);
  font-size: 1.35rem;
  color: var(--charred);
  letter-spacing: .08em;
}

.descent { position: relative; z-index: 2; }

.chamber {
  min-height: 100vh;
  position: relative;
  padding: 8vh 8vw 8vh 13vw;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: repeat(8, minmax(3rem, 1fr));
  overflow: hidden;
  border-bottom: 1px solid rgba(46, 43, 38, .25);
}

.chamber::before {
  content: "";
  position: absolute;
  inset: 5vh 6vw 6vh 10vw;
  background-image:
    linear-gradient(rgba(46,43,38,.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46,43,38,.1) 1px, transparent 1px);
  background-size: 9.7rem 7.4rem;
  transform: translate(var(--shift-x, 0), var(--shift-y, 0));
  transition: transform .25s ease-out;
}

.plaque,
.offset-panel,
.story-fragment,
.door-frame,
.route-note,
.paper-seal {
  position: relative;
  background: rgba(228, 214, 184, .82);
  border: 1px solid rgba(46, 43, 38, .45);
  box-shadow: 10px 13px 0 rgba(141, 125, 104, .18), inset 0 0 0 1px rgba(255,255,255,.25);
  backdrop-filter: blur(2px);
}

.utility-tag,
.tile-number {
  margin: 0 0 .9rem;
  font-family: var(--label);
  font-weight: 600;
  color: var(--rust);
  text-transform: uppercase;
  letter-spacing: .15em;
  font-size: clamp(.8rem, 1.2vw, 1rem);
}

h1,
h2 {
  font-family: var(--display);
  font-weight: 700;
  line-height: .88;
  letter-spacing: .035em;
  margin: 0;
}

h1 { font-size: clamp(5rem, 14vw, 12rem); }
h2 { font-size: clamp(3.1rem, 7.2vw, 7.5rem); max-width: 9ch; }
p { line-height: 1.75; }

.chamber-hero { background: rgba(228, 214, 184, .2); }

.title-plaque {
  grid-column: 3 / 10;
  grid-row: 3 / 5;
  padding: 1.3rem 2rem 1.7rem;
  align-self: center;
  transform: translateX(-2.2vw) rotate(-.7deg);
}

.vertical-marker {
  grid-column: 11;
  grid-row: 2 / 6;
  writing-mode: vertical-rl;
  font-family: var(--display);
  font-size: clamp(2rem, 5vw, 5rem);
  color: rgba(46,43,38,.3);
  letter-spacing: .2em;
  transform: rotate(180deg);
}

.quiet-instruction {
  grid-column: 7 / 11;
  grid-row: 6;
  font-family: var(--label);
  color: var(--taupe);
  font-size: clamp(1.1rem, 2vw, 1.6rem);
  transform: translateX(1.5vw);
}

.noren-strip {
  grid-column: 2 / 6;
  grid-row: 7 / 9;
  display: flex;
  align-items: start;
  gap: .45rem;
  opacity: .7;
  transform: translateY(1.2rem) rotate(.5deg);
}

.noren-strip span {
  width: 3.8rem;
  height: 9rem;
  border: 1px solid rgba(46,43,38,.35);
  background: rgba(111, 138, 122, .32);
  border-radius: 0 0 1.8rem 1.8rem;
}

.bokeh-field, .lanterns { position: absolute; inset: 0; pointer-events: none; }

.bubble,
.clue-bubble,
.close-bubble {
  border-radius: 999px;
  border: 1px solid rgba(155, 183, 188, .72);
  background:
    radial-gradient(circle at 34% 28%, rgba(255,255,255,.7) 0 9%, transparent 10%),
    radial-gradient(circle at 62% 68%, rgba(111,138,122,.18), transparent 44%),
    rgba(155, 183, 188, .24);
  box-shadow: inset -18px -16px 30px rgba(46,43,38,.08), 0 0 38px rgba(155,183,188,.34);
}

.bubble { position: absolute; animation: rise 12s ease-in-out infinite; }
.bubble-one { width: 8rem; height: 8rem; left: 23%; top: 78%; }
.bubble-two { width: 4.8rem; height: 4.8rem; left: 58%; top: 83%; animation-delay: -4s; }
.bubble-three { width: 11rem; height: 11rem; right: 12%; top: 67%; animation-delay: -8s; opacity: .74; }

@keyframes rise {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  48% { transform: translate3d(12px, -7rem, 0) scale(1.05); }
  70% { transform: translate3d(-8px, -5.4rem, 0) scale(.98); }
}

.chamber-tile { background: linear-gradient(180deg, rgba(141,125,104,.08), rgba(111,138,122,.11)); }
.panel-a { grid-column: 3 / 8; grid-row: 2 / 5; padding: 1.4rem; transform: translateX(-1.8vw) rotate(.45deg); }
.fragment-a { grid-column: 8 / 12; grid-row: 5 / 7; padding: 1.2rem 1.4rem; color: var(--taupe); transform: translate(.8vw, -1.2vh) rotate(-.6deg); }

.drain-cover {
  grid-column: 2 / 4;
  grid-row: 6 / 8;
  width: 10rem;
  height: 10rem;
  border-radius: 50%;
  align-self: center;
  justify-self: center;
  background:
    repeating-radial-gradient(circle, transparent 0 14px, rgba(46,43,38,.3) 15px 17px),
    radial-gradient(circle, rgba(141,125,104,.45), rgba(46,43,38,.16));
  border: 2px solid rgba(46,43,38,.4);
}

.map-scrap { grid-column: 8 / 12; grid-row: 2 / 4; width: min(22vw, 16rem); filter: drop-shadow(12px 13px 0 rgba(141,125,104,.16)); transform: rotate(5deg); }

.chamber-index { background: rgba(155,183,188,.09); }
.index-header { grid-column: 3 / 8; grid-row: 2 / 4; position: relative; z-index: 2; transform: translateX(1.2vw); }
.bubble-ledger { grid-column: 6 / 12; grid-row: 4 / 7; position: relative; }

.clue-bubble {
  position: absolute;
  display: grid;
  place-items: center;
  color: var(--charred);
  font-family: var(--label);
  font-size: 1.6rem;
  cursor: pointer;
  transition: transform .25s ease, box-shadow .25s ease, opacity .25s ease;
}

.clue-bubble:nth-child(1) { width: 9rem; height: 9rem; left: 3%; top: 6%; }
.clue-bubble:nth-child(2) { width: 6.7rem; height: 6.7rem; left: 39%; top: 30%; }
.clue-bubble:nth-child(3) { width: 11rem; height: 11rem; left: 64%; top: 0; }
.clue-bubble:nth-child(4) { width: 4.8rem; height: 4.8rem; left: 27%; top: 66%; }
.clue-bubble.amber { border-color: rgba(216,159,122,.8); background-color: rgba(216,159,122,.22); }
.clue-bubble.green { border-color: rgba(111,138,122,.8); background-color: rgba(111,138,122,.24); }
.clue-bubble:hover { box-shadow: 0 0 0 9px rgba(216,159,122,.12), 0 0 55px rgba(155,183,188,.55); }

.route-note { grid-column: 2 / 6; grid-row: 6; padding: 1rem 1.2rem; font-family: var(--label); color: var(--rust); transform: rotate(-1deg); }
.chalk-arrow { grid-column: 2 / 7; grid-row: 7; color: rgba(46,43,38,.45); font-family: var(--display); font-size: clamp(1.8rem, 4vw, 4rem); letter-spacing: .09em; transform: rotate(.6deg); }

.chamber-platform { background: linear-gradient(180deg, rgba(111,138,122,.12), rgba(46,43,38,.08)); }
.platform-line { grid-column: 1 / 13; grid-row: 5; height: 1.1rem; background: repeating-linear-gradient(90deg, var(--charred) 0 2.8rem, transparent 2.8rem 4.1rem); opacity: .36; transform: translateY(2rem) rotate(-.25deg); }
.panel-b { grid-column: 5 / 10; grid-row: 2 / 5; padding: 1.4rem; transform: translateX(-.8vw) rotate(-.35deg); }
.fragment-b { grid-column: 2 / 6; grid-row: 5 / 7; padding: 1.2rem 1.4rem; color: var(--taupe); transform: translateY(2.5vh) rotate(.7deg); }

.lanterns span {
  position: absolute;
  top: 18%;
  width: 5rem;
  height: 5rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(216,159,122,.58), rgba(216,159,122,.12) 42%, transparent 70%);
  filter: blur(5px);
  animation: lantern 5s ease-in-out infinite;
}
.lanterns span:nth-child(1) { left: 18%; transform: scale(.65); }
.lanterns span:nth-child(2) { left: 39%; top: 13%; animation-delay: -1.1s; }
.lanterns span:nth-child(3) { left: 63%; top: 21%; transform: scale(.82); animation-delay: -2.2s; }
.lanterns span:nth-child(4) { left: 82%; top: 15%; transform: scale(.5); animation-delay: -3.3s; }
@keyframes lantern { 50% { opacity: .45; filter: blur(8px); } }

.token {
  grid-column: 10 / 12;
  grid-row: 6 / 8;
  width: 7rem;
  height: 7rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--display);
  font-size: 3rem;
  color: var(--charred);
  background: radial-gradient(circle at 35% 28%, var(--amber), var(--rust));
  box-shadow: 12px 16px 0 rgba(141,125,104,.2);
}

.chamber-door { background: rgba(162,106,78,.07); }
.door-frame { grid-column: 4 / 9; grid-row: 2 / 7; padding: 1.5rem 1.6rem; border-width: 2px; box-shadow: inset 0 0 0 12px rgba(141,125,104,.15), 16px 18px 0 rgba(46,43,38,.1); }
.door-frame p:last-child { max-width: 33rem; color: var(--taupe); }
.close-bubble { grid-column: 9 / 12; grid-row: 5 / 7; width: 13rem; height: 13rem; display: grid; place-items: center; font-family: var(--label); color: var(--green); transform: translate(-1rem, -2rem); }
.paper-seal { grid-column: 2 / 5; grid-row: 7; padding: .85rem 1rem; color: var(--rust); font-family: var(--label); text-transform: uppercase; letter-spacing: .14em; transform: rotate(1.2deg); }

.magnetic,
.magnetic-card,
.magnetic-scrap,
.magnet-label,
.token {
  will-change: transform;
  transition: transform .18s ease-out;
}

.pop-note {
  animation: notePop .36s ease;
}

@keyframes notePop {
  0% { transform: rotate(-1deg) scale(.98); }
  55% { transform: rotate(-1.6deg) scale(1.04); }
  100% { transform: rotate(-1deg) scale(1); }
}

@media (max-width: 760px) {
  .depth-ruler { left: .35rem; width: 3rem; }
  .chamber { padding: 7vh 5vw 7vh 16vw; grid-template-columns: repeat(6, 1fr); }
  .title-plaque, .panel-a, .panel-b, .door-frame, .index-header { grid-column: 1 / 7; }
  .quiet-instruction, .fragment-a, .fragment-b, .route-note, .chalk-arrow, .bubble-ledger, .close-bubble, .paper-seal, .map-scrap { grid-column: 1 / 7; }
  .bubble-ledger { grid-row: 5 / 8; min-height: 18rem; }
  .door-frame { grid-row: 2 / 5; }
  .close-bubble { grid-row: 6 / 8; justify-self: end; width: 9rem; height: 9rem; }
  h1 { font-size: clamp(4.2rem, 22vw, 7rem); }
}