:root {
  /* Compliance tokens from typography brief: Mono** only small indices such as `P1` Sans** where clarity matters */
  --void: #050404;
  --charcoal: #14100C;
  --gold: #D6A83A;
  --molten: #FFD76A;
  --coral: #FF4D6D;
  --violet: #8B5CFF;
  --parchment: #F1E4C4;
  --jost: 'Jost', 'Futura', sans-serif;
  --body: 'IBM Plex Sans', 'Inter', sans-serif;
  --serif: 'Libre Baskerville', serif;
  --mono: 'IBM Plex Mono', monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--void);
  color: var(--parchment);
  font-family: var(--body);
  overflow-x: hidden;
}

.chamber-shell {
  position: relative;
  min-height: 720vh;
  background:
    radial-gradient(circle at 18% 12%, rgba(214, 168, 58, .13), transparent 26rem),
    radial-gradient(circle at 82% 36%, rgba(139, 92, 255, .12), transparent 30rem),
    linear-gradient(135deg, var(--void), #090706 48%, var(--charcoal));
  isolation: isolate;
}

.void-gradient {
  position: fixed;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(5, 4, 4, .94), rgba(20, 16, 12, .55), rgba(5, 4, 4, .9)),
    repeating-linear-gradient(112deg, rgba(214, 168, 58, .05) 0 1px, transparent 1px 90px);
  pointer-events: none;
  z-index: -4;
}

.logic-field {
  position: fixed;
  inset: 0;
  z-index: -3;
  overflow: hidden;
  pointer-events: none;
}

.logic-field span {
  position: absolute;
  font-family: var(--jost);
  font-size: clamp(6rem, 15vw, 17rem);
  font-weight: 800;
  color: rgba(241, 228, 196, .045);
  text-shadow: 0 0 55px rgba(214, 168, 58, .08);
  transition: transform .6s ease-out;
}

.logic-field span:nth-child(1) { left: 5%; top: 10%; }
.logic-field span:nth-child(2) { right: 6%; top: 6%; color: rgba(255, 77, 109, .07); }
.logic-field span:nth-child(3) { left: 36%; top: 36%; }
.logic-field span:nth-child(4) { right: 12%; top: 58%; }
.logic-field span:nth-child(5) { left: 14%; bottom: 1%; }
.logic-field span:nth-child(6) { left: 62%; bottom: 14%; color: rgba(139, 92, 255, .08); }

.proof-lines {
  position: fixed;
  left: 0;
  top: 22vh;
  width: 100vw;
  height: 42vh;
  z-index: -2;
  opacity: .82;
  mix-blend-mode: screen;
  pointer-events: none;
}

.draw-path, .connector {
  fill: none;
  stroke: var(--gold);
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  filter: drop-shadow(0 0 12px rgba(255, 215, 106, .55));
}

.path-two { stroke: var(--molten); opacity: .65; }
.path-three { stroke: var(--violet); opacity: .42; }

.proof-spine {
  position: fixed;
  left: 2rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 30;
  display: flex;
  flex-direction: column;
  gap: .55rem;
}

.spine-dot {
  width: 10.5rem;
  border: 1px solid rgba(214, 168, 58, .22);
  border-left: 2px solid var(--gold);
  background: rgba(20, 16, 12, .46);
  color: rgba(241, 228, 196, .58);
  font: 500 .68rem var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  text-align: left;
  padding: .62rem .8rem;
  cursor: pointer;
  backdrop-filter: blur(12px);
  transition: .35s ease;
}

.spine-dot span { color: var(--gold); margin-right: .65rem; }
.spine-dot.active { color: var(--parchment); background: rgba(214, 168, 58, .12); box-shadow: 0 0 22px rgba(214, 168, 58, .18); }

.act {
  min-height: 120vh;
  position: relative;
}

.sticky-scene {
  height: 100vh;
  position: sticky;
  top: 0;
  display: grid;
  place-items: center;
  padding: 6rem 8vw 5rem 15rem;
  overflow: hidden;
  transform-style: preserve-3d;
}

.stage-slab, .premise-stack article, .logic-gate, .act-content::before {
  background: linear-gradient(145deg, rgba(20, 16, 12, .94), rgba(5, 4, 4, .78));
  border: 1px solid rgba(214, 168, 58, .35);
  box-shadow: 0 28px 90px rgba(0, 0, 0, .55), inset 0 1px rgba(255, 215, 106, .25);
}

.stage-slab {
  position: absolute;
  width: 58vw;
  height: 38vh;
  transform: rotate(-8deg) skewX(-7deg) translateZ(-30px);
  opacity: .72;
}

.slab-left { left: 9vw; top: 29vh; }

.act-content {
  position: relative;
  z-index: 5;
  max-width: 62rem;
  transition: transform .75s cubic-bezier(.2,.85,.2,1), opacity .75s ease;
}

.act-content::before {
  content: '';
  position: absolute;
  inset: -2.1rem -2.4rem;
  z-index: -1;
  transform: rotate(-2deg);
  opacity: .52;
}

.proof-index {
  margin: 0 0 1.2rem;
  color: var(--molten);
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .18em;
  text-transform: uppercase;
}

h1, h2 {
  margin: 0;
  font-family: var(--jost);
  font-weight: 800;
  line-height: .9;
  letter-spacing: -.045em;
}

h1 { font-size: clamp(4.6rem, 11vw, 11rem); max-width: 11ch; }
h2 { font-size: clamp(3rem, 7vw, 7.2rem); max-width: 12ch; }

p { font-size: clamp(1rem, 1.45vw, 1.25rem); line-height: 1.65; color: rgba(241, 228, 196, .78); }

blockquote, .serif-note {
  margin: 2rem 0 0;
  font: italic clamp(1.1rem, 2vw, 1.65rem) var(--serif);
  color: rgba(241, 228, 196, .88);
}

.domain-etch {
  display: inline-block;
  margin: 1rem 0 0;
  color: var(--gold);
  font: 600 clamp(1.1rem, 2vw, 1.8rem) var(--jost);
  letter-spacing: .45em;
  text-transform: uppercase;
  text-shadow: 0 0 26px rgba(255, 215, 106, .55);
}

.candle { position: relative; width: 5.8rem; height: 10rem; }
.mini-candle { margin-bottom: 1.25rem; transform: scale(.62); transform-origin: left bottom; }
.candle-body {
  position: absolute;
  left: 1.7rem;
  bottom: 0;
  width: 2.4rem;
  height: 5.2rem;
  border-radius: .65rem .65rem .2rem .2rem;
  background: linear-gradient(90deg, #8b6c25, var(--molten), var(--gold), #6d4e14);
  box-shadow: inset -7px 0 14px rgba(5, 4, 4, .28), 0 0 26px rgba(214, 168, 58, .34);
}
.wick { position: absolute; left: 2.78rem; bottom: 5.05rem; width: .16rem; height: 1.15rem; background: var(--void); z-index: 4; }
.flame { position: absolute; left: 50%; border-radius: 52% 48% 54% 46% / 65% 65% 35% 35%; transform: translateX(-50%) rotate(2deg); animation: flicker 1.9s infinite alternate ease-in-out; }
.flame.outer { bottom: 5.75rem; width: 2.3rem; height: 3.25rem; background: linear-gradient(var(--molten), var(--gold) 55%, rgba(255, 77, 109, .75)); filter: drop-shadow(0 0 28px rgba(255, 215, 106, .9)); }
.flame.inner { bottom: 6.25rem; width: 1.05rem; height: 1.9rem; background: #F1E4C4; animation-delay: -.6s; }
.halo { position: absolute; inset: -5rem; border-radius: 50%; background: radial-gradient(circle, rgba(255, 215, 106, .34), rgba(139, 92, 255, .14) 35%, transparent 68%); animation: breathe 3.8s ease-in-out infinite; }

.theorem-seal {
  position: absolute;
  display: grid;
  place-items: center;
  width: 9rem;
  height: 9rem;
  border: 2px solid var(--gold);
  border-radius: 50%;
  color: var(--gold);
  font: 800 3rem var(--jost);
  box-shadow: 0 0 40px rgba(214, 168, 58, .25), inset 0 0 30px rgba(214, 168, 58, .1);
}
.seal-a { right: 12vw; top: 18vh; }
.seal-not { right: 13vw; bottom: 16vh; color: var(--coral); border-color: var(--coral); }

.premise-stack { position: absolute; left: 12vw; top: 20vh; width: min(34rem, 42vw); display: grid; gap: 1rem; perspective: 900px; }
.premise-stack article { padding: 1.5rem 1.7rem; transform: translateX(var(--shift, 0)) rotateY(-12deg) rotateZ(var(--tilt, -2deg)); transition: .8s ease; }
.premise-stack article:nth-child(2) { --shift: 2.6rem; --tilt: 2deg; }
.premise-stack article:nth-child(3) { --shift: 5.2rem; --tilt: -1deg; }
.premise-stack span { font: 500 .8rem var(--mono); color: var(--molten); letter-spacing: .16em; }
.premise-stack strong { display: block; margin: .65rem 0; font: 700 1.55rem var(--jost); }
.premise-stack em { font: italic .9rem var(--serif); color: rgba(241, 228, 196, .6); }
.side-content { margin-left: auto; max-width: 42rem; }
.logic-gate { position: absolute; right: 14vw; top: 17vh; width: 10rem; height: 10rem; display: grid; place-items: center; transform: rotate(45deg); }
.logic-gate span { transform: rotate(-45deg); font: 800 4rem var(--jost); color: var(--gold); }

.tilted { transform: rotate(var(--scene-rotate, 0deg)); transition: transform .8s ease; }
.contradiction.active .tilted { --scene-rotate: -1.4deg; }
.coral-slash { position: absolute; width: 28vw; height: 120vh; background: linear-gradient(180deg, transparent, var(--coral), transparent); transform: rotate(32deg); box-shadow: 0 0 60px rgba(255, 77, 109, .5); opacity: .85; }
.contradiction-copy { margin-right: auto; max-width: 48rem; }
.reflected-candles { position: absolute; inset: auto 10vw 8vh auto; display: flex; gap: 1.8rem; transform: skewX(-18deg); opacity: .6; }
.reflected-candles span { width: 2rem; height: 8rem; border-radius: 50% 50% 8% 8%; background: linear-gradient(transparent, rgba(255, 215, 106, .9), rgba(255, 77, 109, .35)); filter: blur(.5px); animation: flicker 1.7s infinite alternate; }

.inference-map { position: absolute; width: min(78vw, 980px); height: min(70vh, 620px); overflow: visible; }
.node { fill: rgba(20, 16, 12, .9); stroke: var(--gold); stroke-width: 2; filter: drop-shadow(0 0 18px rgba(214,168,58,.28)); }
.inference-copy { margin-left: auto; max-width: 38rem; }
.split-flames { position: absolute; left: 20vw; bottom: 20vh; display: flex; gap: 4rem; }
.split-flames i { width: 2rem; height: 3.3rem; background: linear-gradient(var(--parchment), var(--molten), var(--gold)); border-radius: 55% 45% 52% 48% / 66% 66% 34% 34%; filter: drop-shadow(0 0 20px rgba(255, 215, 106, .8)); animation: flicker 1.6s infinite alternate; }

.illuminated { background: radial-gradient(circle at 50% 55%, rgba(214, 168, 58, .12), transparent 36rem); }
.centered-copy { text-align: center; }
.centered-copy h2 { margin: auto; }
.wax-orbit { position: absolute; width: min(70vw, 680px); aspect-ratio: 1; border: 1px solid rgba(214, 168, 58, .3); border-radius: 50%; animation: orbit 18s linear infinite; }
.wax-orbit span { position: absolute; display: grid; place-items: center; width: 5rem; height: 5rem; border-radius: 50%; border: 1px solid var(--gold); background: rgba(5,4,4,.7); color: var(--gold); font: 800 1.4rem var(--jost); }
.wax-orbit span:nth-child(1) { left: 46%; top: -2.5rem; }
.wax-orbit span:nth-child(2) { right: -2.5rem; top: 46%; }
.wax-orbit span:nth-child(3) { left: 46%; bottom: -2.5rem; }
.wax-orbit span:nth-child(4) { left: -2.5rem; top: 46%; }
.smoke-parentheses { position: absolute; inset: 0; display: flex; justify-content: space-around; align-items: center; color: rgba(241, 228, 196, .06); font: 800 42vw var(--jost); pointer-events: none; }

.resolution-scene { text-align: center; }
.final-candle { width: 9rem; height: 15rem; margin-bottom: 3rem; }
.final-candle .candle-body { left: 2.65rem; width: 3.7rem; height: 7.5rem; }
.final-candle .wick { left: 4.42rem; bottom: 7.28rem; }
.final-candle .flame.outer { bottom: 8rem; width: 3.3rem; height: 4.7rem; }
.final-candle .flame.inner { bottom: 8.8rem; width: 1.5rem; height: 2.6rem; }
.final-copy h2 { margin: auto; max-width: 11ch; }
.qed-seal { margin: 2.2rem auto 0; width: 7.5rem; height: 7.5rem; display: grid; place-items: center; border: 2px solid var(--gold); border-radius: 50%; color: var(--molten); font: 800 1.35rem var(--jost); letter-spacing: .18em; box-shadow: 0 0 38px rgba(214,168,58,.3), inset 0 0 28px rgba(214,168,58,.12); }

.act:not(.active) .act-content { opacity: .38; transform: translateY(24px) scale(.98); }
.act.active .connector, .act.active .draw-path { stroke-dashoffset: var(--line-offset, .2); }
.premises.active .premise-stack article { transform: translateX(var(--shift, 0)) rotateY(-4deg) rotateZ(var(--tilt, -2deg)) translateZ(40px); }

@keyframes flicker { 0% { transform: translateX(-50%) rotate(-3deg) scaleY(.94); } 100% { transform: translateX(-50%) rotate(4deg) scaleY(1.06); } }
@keyframes breathe { 0%,100% { opacity: .55; transform: scale(.94); } 50% { opacity: .9; transform: scale(1.07); } }
@keyframes orbit { to { transform: rotate(360deg); } }

@media (max-width: 900px) {
  .proof-spine { left: .75rem; width: auto; }
  .spine-dot { width: 3.7rem; overflow: hidden; white-space: nowrap; padding: .55rem; }
  .sticky-scene { padding: 5rem 1.25rem 4rem 5.2rem; }
  .premise-stack { position: relative; left: auto; top: auto; width: 100%; margin-bottom: 2rem; }
  .sticky-scene { align-content: center; }
  h1 { font-size: clamp(3.7rem, 18vw, 6rem); }
  h2 { font-size: clamp(2.6rem, 13vw, 4.8rem); }
  .theorem-seal, .logic-gate { opacity: .45; right: 1rem; }
  .coral-slash { width: 52vw; }
}