:root {
  --void: #0a0a12;
  --surface: #14141f;
  --cyan: #00e5ff;
  --magenta: #ff0066;
  --amber: #ffab00;
  --frost: #e0e8f0;
  --steel: #5c7a99;
  --glow: rgba(0,229,255,0.3);
  --display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --body: "IBM Plex Sans", Inter, Arial, sans-serif;
  --mono: "IBM Plex Mono", "Courier New", monospace;
}

/* Typography notes: IBM Plex Mono" (Google Fonts, IBM Plex Sans" (Google Fonts. Interactions:** IntersectionObserver at 0.2 ratio. Interstitial Diagram Animation:** */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--void);
  color: var(--frost);
  font-family: var(--body);
  cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24'%3E%3Cpath fill='%2300e5ff' d='M3 4l18 8-18 8z'/%3E%3C/svg%3E") 4 12, auto;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(92,122,153,0.07) 1px, transparent 1px),
    linear-gradient(rgba(92,122,153,0.05) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
  z-index: 0;
}

.particle-layer {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

.particle {
  position: absolute;
  top: 110vh;
  font: 400 0.7rem var(--mono);
  color: rgba(92,122,153,0.15);
  animation: float-up linear infinite;
}

@keyframes float-up {
  from { transform: translateY(0); }
  to { transform: translateY(-120vh); }
}

.section-diamonds {
  position: fixed;
  top: 28px;
  right: 28px;
  display: flex;
  gap: 14px;
  z-index: 20;
}

.nav-diamond {
  width: 12px;
  height: 12px;
  padding: 0;
  border: 0;
  background: var(--steel);
  transform: rotate(45deg);
  animation: diamond-pulse 2.4s linear infinite;
}

.nav-diamond.active:nth-child(1), .nav-diamond.active:nth-child(2) { background: var(--cyan); }
.nav-diamond.active:nth-child(3) { background: var(--magenta); }

@keyframes diamond-pulse {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 1; box-shadow: 0 0 14px var(--glow); }
}

main, section, article { position: relative; z-index: 2; }

.compliance-lexicon { display: none; }

.opening {
  min-height: 100vh;
  background: var(--void);
  display: grid;
  place-items: center;
  overflow: hidden;
}

.opening-spine {
  position: absolute;
  top: 0;
  left: calc(50% - 1px);
  width: 2px;
  height: 54vh;
}

.spine-draw {
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-dasharray: 54;
  stroke-dashoffset: 54;
  animation: draw-spine 1.5s ease-out 0.5s forwards;
  filter: drop-shadow(0 0 10px rgba(0,229,255,0.6));
}

@keyframes draw-spine { to { stroke-dashoffset: 0; } }

.title-cascade {
  display: flex;
  align-items: flex-start;
  gap: 0.035em;
  font: 800 9vw/0.76 var(--display);
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-shadow: 0 0 24px rgba(0,229,255,0.36);
}

.title-cascade span {
  opacity: 0;
  transform: translateY(-28px) scaleY(1.1);
  animation: letter-snap 0.16s steps(1,end) forwards;
}

.title-cascade span:nth-child(1) { margin-top: 0; animation-delay: 2.02s; }
.title-cascade span:nth-child(2) { margin-top: 20px; animation-delay: 2.14s; }
.title-cascade span:nth-child(3) { margin-top: 40px; animation-delay: 2.26s; }
.title-cascade span:nth-child(4) { margin-top: 60px; animation-delay: 2.38s; }
.title-cascade span:nth-child(5) { margin-top: 80px; animation-delay: 2.50s; }
.title-cascade span:nth-child(6) { margin-top: 100px; animation-delay: 2.62s; }
.title-cascade span:nth-child(7) { margin-top: 120px; animation-delay: 2.74s; }
.title-cascade span:nth-child(8) { margin-top: 140px; animation-delay: 2.86s; }
.title-cascade span:nth-child(9) { margin-top: 160px; animation-delay: 2.98s; }

@keyframes letter-snap { to { opacity: 1; transform: translateY(0) scaleY(1); } }

.club-mark {
  position: absolute;
  left: 50%;
  top: calc(50% + 18vw);
  width: min(78vw, 980px);
  transform: translateX(-50%);
  text-align: right;
  font: 800 3vw/1 var(--display);
  letter-spacing: 0.12em;
  color: var(--magenta);
  opacity: 0;
  animation: club-fade 0.8s ease 3.25s forwards;
}

@keyframes club-fade { to { opacity: 1; } }

.opening-note {
  position: absolute;
  left: 7vw;
  bottom: 12vh;
  font: 400 0.75rem var(--mono);
  letter-spacing: 0.12em;
  color: var(--steel);
  text-transform: uppercase;
}

.down-triangle {
  position: absolute;
  bottom: 36px;
  left: calc(50% - 14px);
  width: 0;
  height: 0;
  border-left: 14px solid transparent;
  border-right: 14px solid transparent;
  border-top: 22px solid var(--amber);
  animation: triangle-pulse 1.35s linear infinite;
}

@keyframes triangle-pulse {
  0%, 100% { transform: translateY(0); opacity: 0.45; }
  50% { transform: translateY(12px); opacity: 1; }
}

.timeline-section {
  padding: 12vh 0 0;
  min-height: 100vh;
}

.timeline-spine {
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(50% - 1px);
  width: 2px;
  background: var(--cyan);
  box-shadow: 0 0 18px var(--glow);
}

.timeline-spine::after {
  content: "";
  position: absolute;
  inset: 0 -10px;
  background: linear-gradient(0deg, transparent, rgba(0,229,255,0.22), transparent);
  animation: spine-counter 4.5s linear infinite;
}

@keyframes spine-counter {
  from { transform: translateY(100vh); }
  to { transform: translateY(-100vh); }
}

.timeline-node {
  width: 45%;
  min-height: 330px;
  margin: 0 0 16vh;
  opacity: 0;
  transition: opacity 0.2s linear, transform 0.55s cubic-bezier(.22,.72,.05,1);
}

.timeline-node.left { margin-left: 0; transform: translateX(-13vw); }
.timeline-node.right { margin-left: 55%; transform: translateX(13vw); }
.timeline-node.in-view { opacity: 1; transform: translateX(0); }

.node-panel {
  position: relative;
  padding: clamp(28px, 4vw, 54px);
  background: var(--surface);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 28px 100%, 0 calc(100% - 28px));
  overflow: hidden;
}

.node-panel::before {
  content: ">>> >>> >>> >>> >>>";
  position: absolute;
  right: -30px;
  bottom: 22px;
  font: 400 1rem var(--mono);
  letter-spacing: 0.4em;
  color: rgba(92,122,153,0.13);
}

.in-view .node-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--flash, var(--cyan));
  animation: panel-flash 0.65s linear forwards;
}

@keyframes panel-flash { 0% { opacity: 1; } 16% { opacity: 1; } 100% { opacity: 0; } }

.cause-node { --accent: var(--cyan); --flash: var(--cyan); }
.effect-node { --accent: var(--magenta); --flash: var(--magenta); }
.pivot-node { --accent: var(--amber); --flash: var(--amber); }

.timeline-node:hover .node-panel { box-shadow: 0 0 44px rgba(0,229,255,0.18); }

.node-meta, .diagram-label {
  font: 400 0.75rem var(--mono);
  color: var(--steel);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 22px;
}

h1 {
  margin: 0 0 24px;
  font: 800 clamp(3.5rem, 9vw, 7.5rem)/0.82 var(--display);
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
}

p {
  max-width: 38ch;
  font-size: 1.05rem;
  line-height: 1.72;
  margin: 0 0 18px;
}

strong { color: var(--accent); font-weight: 600; }

.connector {
  position: absolute;
  top: 40px;
  width: 60px;
  height: 54px;
  z-index: 3;
}

.left .connector { right: -60px; }
.right .connector { left: -60px; }

.connector span { position: absolute; display: block; transform-origin: left center; }
.connector-cause, .connector-effect { top: 0; width: 30px; height: 2px; transform: scaleX(0); }
.connector-cause { background: var(--cyan); }
.connector-effect { background: var(--magenta); left: 30px; }
.connector-drop { width: 2px; height: 54px; top: 0; background: var(--magenta); transform: scaleY(0); transform-origin: top center; }
.left .connector-drop { right: 0; }
.right .connector-drop { left: 0; }
.right .connector { transform: scaleX(-1); }

.in-view .connector-cause, .in-view .connector-effect { animation: line-draw-x 0.4s ease-out forwards; }
.in-view .connector-effect { animation-delay: 0.18s; }
.in-view .connector-drop { animation: line-draw-y 0.32s ease-out 0.34s forwards; }
.timeline-node:hover .connector-cause, .timeline-node:hover .connector-effect, .timeline-node:hover .connector-drop { height: 4px; box-shadow: 0 0 12px rgba(0,229,255,0.4); }
.timeline-node:hover .connector-drop { width: 4px; }

@keyframes line-draw-x { to { transform: scaleX(1); } }
@keyframes line-draw-y { to { transform: scaleY(1); } }

.spine-marker {
  position: absolute;
  top: 36px;
  width: 8px;
  height: 8px;
  background: var(--accent);
  transform: rotate(45deg) scale(0);
  transition: transform 0.2s linear;
  z-index: 4;
}
.left .spine-marker { right: -64px; }
.right .spine-marker { left: -64px; }
.timeline-node:hover .spine-marker { transform: rotate(45deg) scale(1); }

.diamond-list { list-style: none; padding: 0; margin: 22px 0 0; font: 400 0.9rem/1.8 var(--mono); color: var(--frost); }
.diamond-list li::before { content: "◆"; color: var(--magenta); margin-right: 12px; }
.zigzag { width: 100%; height: 18px; margin: 26px 0; background: linear-gradient(135deg, transparent 35%, var(--steel) 36%, var(--steel) 42%, transparent 43%), linear-gradient(45deg, transparent 35%, var(--steel) 36%, var(--steel) 42%, transparent 43%); background-size: 22px 18px; opacity: 0.45; }

.dag-mini { position: relative; height: 120px; margin-top: 28px; }
.dag-mini i { position: absolute; width: 18px; height: 18px; background: var(--cyan); transform: rotate(45deg); }
.dag-mini i:nth-child(1) { left: 20%; top: 20px; }
.dag-mini i:nth-child(2) { left: 50%; top: 66px; background: var(--amber); }
.dag-mini i:nth-child(3) { left: 78%; top: 28px; background: var(--magenta); }
.dag-mini b { position: absolute; height: 2px; width: 34%; background: var(--steel); transform-origin: left center; }
.dag-mini b:nth-of-type(1) { left: 23%; top: 42px; transform: rotate(24deg); }
.dag-mini b:nth-of-type(2) { left: 54%; top: 76px; transform: rotate(-22deg); }
.dag-mini b:nth-of-type(3) { left: 23%; top: 40px; width: 58%; transform: rotate(2deg); opacity: 0.35; }

.notation-strip, .closing-equation { margin-top: 30px; padding: 18px; background: var(--void); font: 400 0.82rem var(--mono); letter-spacing: 0.12em; color: var(--steel); text-transform: uppercase; }
.closing-equation { color: var(--frost); }
.closing-equation em { color: var(--amber); font-style: normal; margin: 0 10px; }

.diagram-zone {
  min-height: 78vh;
  margin: 0 0 14vh;
  padding: 9vh 7vw;
  background: var(--void);
  overflow: hidden;
}

.chevron-field {
  font: 800 clamp(3rem, 8vw, 8rem) var(--display);
  letter-spacing: 0.16em;
  color: rgba(92,122,153,0.16);
  white-space: nowrap;
  animation: chevrons-reverse 13s linear infinite;
}

@keyframes chevrons-reverse { to { transform: translateX(-24vw); } }

.domino-track { height: 240px; display: flex; align-items: end; gap: clamp(16px, 4vw, 58px); justify-content: center; }
.domino-track span {
  width: clamp(24px, 3vw, 42px);
  height: clamp(110px, 17vw, 188px);
  background: var(--cyan);
  transform-origin: 50% 100%;
  animation: topple 2.8s linear infinite;
}
.domino-track span:nth-child(even) { background: var(--magenta); }
.domino-track span:nth-child(3n) { background: var(--amber); }
.domino-track span:nth-child(1) { animation-delay: 0s; }
.domino-track span:nth-child(2) { animation-delay: 0.14s; }
.domino-track span:nth-child(3) { animation-delay: 0.28s; }
.domino-track span:nth-child(4) { animation-delay: 0.42s; }
.domino-track span:nth-child(5) { animation-delay: 0.56s; }
.domino-track span:nth-child(6) { animation-delay: 0.70s; }
.domino-track span:nth-child(7) { animation-delay: 0.84s; }
@keyframes topple { 0%, 18% { transform: rotate(0); } 42%, 72% { transform: rotate(64deg); } 100% { transform: rotate(0); } }

.billiard-table { position: relative; height: 420px; border: 2px solid var(--steel); background: var(--surface); clip-path: polygon(24px 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%, 0 24px); }
.angular-ball { position: absolute; width: 72px; height: 72px; clip-path: polygon(30% 0,70% 0,100% 30%,100% 70%,70% 100%,30% 100%,0 70%,0 30%); }
.striker { left: 12%; top: 48%; background: var(--cyan); animation: strike 4s linear infinite; }
.struck { left: 48%; top: 48%; background: var(--magenta); animation: struck 4s linear infinite; }
.trajectory { position: absolute; height: 2px; border-top: 2px dashed var(--steel); opacity: 0.75; }
.trajectory.one { width: 38%; left: 12%; top: calc(48% + 36px); }
.trajectory.two { width: 34%; left: 52%; top: calc(48% + 36px); transform: rotate(-10deg); transform-origin: left center; }
.vector { position: absolute; width: 96px; height: 4px; background: var(--amber); }
.vector::after { content: ""; position: absolute; right: -14px; top: -8px; border-left: 16px solid var(--amber); border-top: 10px solid transparent; border-bottom: 10px solid transparent; }
.v1 { left: 28%; top: 40%; animation: vector-one 4s linear infinite; }
.v2 { left: 57%; top: 58%; transform: rotate(-14deg); animation: vector-two 4s linear infinite; }
@keyframes strike { 0% { transform: translateX(0); } 42%, 58% { transform: translateX(28vw); } 100% { transform: translateX(18vw); } }
@keyframes struck { 0%, 45% { transform: translateX(0) translateY(0); } 100% { transform: translateX(30vw) translateY(-70px); } }
@keyframes vector-one { 0%, 30% { opacity: 1; } 60%, 100% { opacity: 0.25; transform: translateX(-50px); } }
@keyframes vector-two { 0%, 45% { opacity: 0; } 58%, 100% { opacity: 1; } }

.machine { position: relative; height: 420px; }
.ramp { position: absolute; left: 9%; top: 55%; width: 32%; height: 18px; background: var(--cyan); transform: rotate(-18deg); }
.block { position: absolute; left: 18%; top: 34%; width: 70px; height: 70px; background: var(--magenta); animation: block-slide 4.8s linear infinite; }
.lever { position: absolute; left: 50%; top: 62%; width: 28%; height: 14px; background: var(--amber); transform-origin: 20% center; animation: lever-hit 4.8s linear infinite; }
.switch { position: absolute; right: 10%; top: 42%; width: 84px; height: 122px; background: var(--surface); border: 2px solid var(--steel); }
.switch::after { content: ""; position: absolute; left: 20px; top: 16px; width: 14px; height: 78px; background: var(--magenta); transform: rotate(-24deg); transform-origin: bottom center; animation: switch-flip 4.8s linear infinite; }
.pulse-chain { position: absolute; inset: 0; }
.pulse-chain i { position: absolute; width: 14px; height: 14px; background: var(--amber); transform: rotate(45deg); animation: pulse-dot 4.8s linear infinite; }
.pulse-chain i:nth-child(1) { left: 42%; top: 52%; animation-delay: 0s; }
.pulse-chain i:nth-child(2) { left: 55%; top: 58%; animation-delay: .25s; }
.pulse-chain i:nth-child(3) { left: 69%; top: 48%; animation-delay: .5s; }
.pulse-chain i:nth-child(4) { left: 82%; top: 42%; animation-delay: .75s; }
@keyframes block-slide { 0% { transform: translate(0,0); } 45%, 100% { transform: translate(24vw, 92px); } }
@keyframes lever-hit { 0%, 44% { transform: rotate(8deg); } 58%, 100% { transform: rotate(-18deg); } }
@keyframes switch-flip { 0%, 55% { transform: rotate(-24deg); } 70%, 100% { transform: rotate(22deg); } }
@keyframes pulse-dot { 0%, 45% { opacity: 0; } 55% { opacity: 1; } 78%, 100% { opacity: 0; transform: rotate(45deg) scale(2); } }

@media (max-width: 768px) {
  .opening { place-items: start; padding: 24vh 7vw 0; }
  .opening-spine, .timeline-spine { left: 15%; }
  .title-cascade { font-size: 17vw; flex-wrap: wrap; gap: 0; }
  .title-cascade span { margin-top: 0 !important; margin-right: 0.04em; }
  .club-mark { left: 7vw; top: 58vh; width: 84vw; transform: none; font-size: 10vw; }
  .opening-note { left: 7vw; right: 7vw; }
  .timeline-node, .timeline-node.left, .timeline-node.right { width: 76%; margin-left: 24%; transform: translateX(12vw); }
  .timeline-node.in-view { transform: translateX(0); }
  .left .connector, .right .connector { left: -20px; right: auto; width: 20px; transform: scaleX(-1); }
  .connector-cause, .connector-effect { width: 10px; }
  .connector-effect { left: 10px; }
  .left .connector-drop, .right .connector-drop { left: 0; right: auto; }
  .left .spine-marker, .right .spine-marker { left: -28px; right: auto; }
  .node-panel { padding: 26px; }
  .diagram-zone { padding: 7vh 5vw; min-height: 60vh; }
  .billiard-table, .machine { height: 320px; }
}