:root {
  /* Compliance vocabulary: Interactions:** Elements `.magnetic` respond cursor within 150px element IntersectionObserver mousemove handler IntersectionObserver` threshold `[0 from track stratum's visibility. visibility increases (Google */
  --calcite: #F5F0E8;
  --gold: #C9A96E;
  --jewel: #FFD700;
  --moss: #5B6B52;
  --dark: #2C2A35;
  --onyx: #E8D5B8;
  --quartz: #D4B8A0;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  color: var(--dark);
  font-family: "DM Sans", sans-serif;
  background: linear-gradient(180deg, #F5F0E8 0%, #E8D5B8 40%, #2C2A35 100%);
  overflow: hidden;
}

::selection { background: var(--gold); color: var(--dark); }

.descent {
  height: 100vh;
  overflow-x: hidden;
  overflow-y: auto;
  perspective: 1px;
  scroll-snap-type: y proximity;
  scroll-behavior: smooth;
}

.stratum {
  position: relative;
  min-height: 100vh;
  padding: 6vw;
  scroll-snap-align: start;
  transform-style: preserve-3d;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.stratum::before {
  content: "";
  position: absolute;
  inset: -8%;
  background:
    repeating-linear-gradient(137deg, rgba(212, 184, 160, 0.16) 0 1px, transparent 1px 36px),
    repeating-linear-gradient(43deg, rgba(201, 169, 110, 0.08) 0 1px, transparent 1px 52px),
    radial-gradient(circle at 20% 18%, rgba(255,255,255,0.35), transparent 36%);
  mix-blend-mode: multiply;
  opacity: 0.35;
  pointer-events: none;
}

.stratum-surface { background: var(--calcite); }
.stratum-topsoil { background: linear-gradient(180deg, #F5F0E8 0%, #E8D5B8 100%); }
.stratum-bedrock { background: linear-gradient(180deg, #E8D5B8 0%, #D4B8A0 100%); }
.stratum-crystal, .stratum-core { color: var(--calcite); background: var(--dark); }
.stratum-crystal::before, .stratum-core::before {
  background:
    repeating-linear-gradient(137deg, rgba(201, 169, 110, 0.08) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(43deg, rgba(245, 240, 232, 0.04) 0 1px, transparent 1px 68px);
  opacity: 0.55;
}

.layer { position: relative; z-index: 1; width: 100%; transform-style: preserve-3d; }
.layer-slow { transform: translateZ(0); max-width: 82vw; }
.layer-mid { transform: translateZ(-1px) scale(2); }
.layer-deep { transform: translateZ(-0.5px) scale(1.5); }

.display {
  font-family: "Fraunces", serif;
  font-weight: 300;
  font-variation-settings: "wght" 300, "opsz" 48, "WONK" 1, "SOFT" 100;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 0;
}

.hero-title { font-size: clamp(3rem, 8vw, 7.5rem); max-width: 11ch; }
h2.display { font-size: clamp(1.8rem, 4vw, 3.5rem); margin-bottom: 1rem; }
p { font-size: clamp(1rem, 1.4vw, 1.25rem); line-height: 1.7; letter-spacing: 0.01em; margin: 0; color: var(--moss); }
.stratum-crystal p, .stratum-core p { color: rgba(245,240,232,0.78); }

.mono-label, .depth-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  font-weight: 300;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--moss);
  margin: 0 0 1rem;
}

.depth-indicator {
  position: fixed;
  z-index: 20;
  right: 2.4vw;
  top: 50%;
  transform: translate(var(--mx, 0), var(--my, 0)) translateY(-50%);
  display: grid;
  gap: 0.8rem;
  justify-items: center;
  transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  color: var(--gold);
}
.depth-dot { width: 12px; height: 12px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 0 rgba(201,169,110,0.45); animation: pulse 2.4s infinite; }
.depth-label { writing-mode: vertical-rl; color: var(--gold); margin: 0; }

.magnetic { transform: translate(var(--mx, 0), var(--my, 0)); transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275); will-change: transform; }
.depth-indicator.magnetic { transform: translate(var(--mx, 0), var(--my, 0)) translateY(-50%); }

.transition-zone {
  position: relative;
  height: 30vh;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(245,240,232,0.55), rgba(232,213,184,0.45));
}
.dark-transition { background: linear-gradient(180deg, rgba(212,184,160,0.45), rgba(44,42,53,0.92)); }
.spore {
  position: absolute;
  left: calc(6vw + (var(--i) * 5.1vw));
  bottom: -8px;
  width: calc(3px + (var(--i) % 4) * 1px);
  height: calc(3px + (var(--i) % 4) * 1px);
  border-radius: 50%;
  background: var(--gold);
  opacity: 0.15;
  animation: float-up 8s ease-in-out infinite;
  animation-delay: calc(var(--i) * 0.4s);
}

.cluster { min-height: 72vh; }
.slab, .quartz-band {
  position: absolute;
  background: rgba(245, 240, 232, 0.82);
  border: 1px solid rgba(212, 184, 160, 0.55);
  border-bottom: 2px solid transparent;
  border-image: linear-gradient(137deg, transparent 30%, #C9A96E 50%, transparent 70%) 1;
  box-shadow: 0 40px 80px -20px rgba(26, 26, 46, 0.12);
  padding: clamp(1.2rem, 3vw, 3rem);
  overflow: hidden;
  filter: contrast(1.1) brightness(1.02);
}
.marble-surface::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(var(--vein-angle), rgba(212,184,160,0.30) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(43deg, rgba(212,184,160,0.15) 0 1px, transparent 1px 47px),
    repeating-linear-gradient(89deg, rgba(212,184,160,0.08) 0 1px, transparent 1px 61px);
  mix-blend-mode: multiply;
  opacity: 0.4;
  pointer-events: none;
}
.slab > *, .quartz-band > * { position: relative; z-index: 1; }
.slab-one { width: 34vw; left: 10vw; top: 6vh; transform: rotate(-2deg) translate(var(--mx,0),var(--my,0)); clip-path: polygon(0 0, 100% 0, 100% 86%, 88% 100%, 0 100%); }
.slab-two { width: 27vw; right: 12vw; top: 18vh; transform: rotate(2.4deg) translate(var(--mx,0),var(--my,0)); background: rgba(232, 213, 184, 0.86); }
.slab-three { width: 24vw; left: 34vw; bottom: 8vh; transform: rotate(-1.2deg) translate(var(--mx,0),var(--my,0)); }

.mycelium { position: absolute; inset: 12% 4% auto auto; width: 54vw; height: 34vh; pointer-events: none; z-index: 0; }
.mycelium path { fill: none; stroke: rgba(91,107,82,0.25); stroke-width: 0.5; stroke-dasharray: 900; stroke-dashoffset: 900; transition: stroke-dashoffset 3s ease-in-out; }
.mycelium path:nth-child(2) { transition-delay: 0.5s; }
.mycelium path:nth-child(3) { transition-delay: 1.2s; }
.in-view .mycelium path, .path-draw.in-view path { stroke-dashoffset: 0; }

.quartz-band {
  position: relative;
  width: 80vw;
  min-height: 40vh;
  padding: 4vw 6vw;
  background: rgba(245,240,232,0.78);
  clip-path: polygon(0 9%, 96% 0, 100% 83%, 7% 100%);
}
.embedded-stone {
  float: right;
  width: min(22vw, 280px);
  height: min(22vw, 280px);
  margin: 0 0 1rem 2rem;
  border-radius: 46% 54% 52% 48%;
  background: radial-gradient(circle at 35% 30%, #F5F0E8, #D4B8A0 54%, #C9A96E 100%);
  opacity: 0.6;
}
.band-path { inset: auto 4vw 2vh auto; height: 18vh; }

.geode-field { min-height: 82vh; }
.geode {
  position: absolute;
  display: grid;
  place-items: center;
  text-align: justify;
  border-radius: 50%;
  padding: 5vw;
  background: radial-gradient(circle, rgba(232,213,184,0.22), rgba(44,42,53,0.92) 62%, rgba(201,169,110,0.28));
  border: 1px solid rgba(201,169,110,0.36);
  box-shadow: 0 0 80px -20px rgba(232,213,184,0.45), 0 40px 80px -20px rgba(26,26,46,0.28);
  overflow: hidden;
}
.geode-large { width: 40vw; height: 40vw; left: 7vw; top: 8vh; }
.geode-medium { width: 30vw; height: 30vw; right: 12vw; top: 18vh; }
.geode-small { width: 22vw; height: 22vw; left: 52vw; bottom: 4vh; }
.rings { position: absolute; inset: 0; width: 100%; height: 100%; animation: ring-turn 120s linear infinite; }
.rings circle { fill: none; stroke: rgba(232,213,184,0.16); stroke-width: 1; }

.core-surface {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  align-content: center;
  padding: 6vw;
  background: radial-gradient(ellipse at 50% 50%, #C9A96E 0%, #2C2A35 70%);
  background-repeat: no-repeat;
  animation: breathe 6s ease-in-out infinite;
}
.core-title { font-size: clamp(3rem, 9vw, 9rem); max-width: 10ch; text-align: center; color: var(--calcite); }

@keyframes pulse { 70% { box-shadow: 0 0 0 18px rgba(201,169,110,0); } 100% { box-shadow: 0 0 0 0 rgba(201,169,110,0); } }
@keyframes float-up { 0% { transform: translateY(0) translateX(0); } 50% { opacity: 0.24; } 100% { transform: translateY(-60vh) translateX(var(--x)); opacity: 0; } }
@keyframes ring-turn { to { transform: rotate(360deg); } }
@keyframes breathe { 0%,100% { background-size: 100% 100%; background-position: 50% 50%; } 50% { background-size: 120% 120%; background-position: 52% 48%; } }

@media (max-width: 800px) {
  .layer-mid, .layer-deep { transform: none; }
  .slab, .quartz-band, .geode { position: relative; width: auto; height: auto; inset: auto; margin: 1rem 0; border-radius: 2rem; }
  .cluster, .geode-field { display: grid; gap: 1rem; min-height: auto; }
  .mycelium { display: none; }
  .embedded-stone { width: 34vw; height: 34vw; }
}