:root {
  --midnight: #0B1220;
  --paper: #EAF7FF;
  --cyan: #54E6F2;
  --orange: #FF8A3D;
  --mint: #6CFFB8;
  --red: #FF3D5A;
  --violet: #5B4BFF;
  --ink: #1B2433;
  --progress: 0;
  --chapter-progress: 0;
}

/* Compliance note: IBM Plex Sans Condensed* Condensed** for technical callouts. */

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--paper);
  background: var(--midnight);
  font-family: "IBM Plex Sans Condensed", "Arial Narrow", "Helvetica Neue", sans-serif;
}
button { font: inherit; color: inherit; }

.blueprint-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(30deg, rgba(84, 230, 242, .13) 1px, transparent 1px) 0 0 / 54px 54px,
    linear-gradient(150deg, rgba(234, 247, 255, .055) 1px, transparent 1px) 0 0 / 54px 54px,
    radial-gradient(circle at 18% 22%, rgba(91, 75, 255, .28), transparent 31%),
    radial-gradient(circle at 88% 76%, rgba(84, 230, 242, .18), transparent 34%),
    var(--midnight);
}
.blueprint-field::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .38;
  background-image:
    repeating-linear-gradient(90deg, transparent 0 94px, rgba(234,247,255,.12) 95px, transparent 96px),
    repeating-linear-gradient(0deg, transparent 0 94px, rgba(234,247,255,.08) 95px, transparent 96px);
  mask-image: radial-gradient(circle at center, black, transparent 78%);
}

.step-strip {
  position: fixed;
  z-index: 20;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 82px;
  padding: 14px 10px;
  border: 1px solid rgba(234,247,255,.34);
  background: rgba(11,18,32,.72);
  box-shadow: 10px 12px 0 rgba(27,36,51,.7), inset 0 0 26px rgba(84,230,242,.12);
  clip-path: polygon(0 0, 78% 0, 100% 10%, 100% 100%, 22% 100%, 0 90%);
}
.strip-title {
  font-family: "Azeret Mono", ui-monospace, monospace;
  color: var(--cyan);
  font-size: 10px;
  letter-spacing: .12em;
  writing-mode: vertical-rl;
  position: absolute;
  right: -18px;
  top: 14px;
}
.step-dot {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 6px;
  align-items: center;
  width: 58px;
  margin: 8px 0;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}
.step-dot span { font: 700 11px "Azeret Mono", ui-monospace, monospace; color: rgba(234,247,255,.65); }
.step-dot i {
  width: 24px;
  height: 24px;
  background: rgba(234,247,255,.14);
  border: 1px solid rgba(234,247,255,.4);
  transform: rotate(45deg) skew(-9deg, -9deg);
  box-shadow: inset 0 0 0 3px rgba(84,230,242,.08);
}
.step-dot.active i { background: var(--orange); box-shadow: 0 0 18px rgba(255,138,61,.62), inset 0 0 0 3px rgba(234,247,255,.22); }
.step-dot.active span { color: var(--paper); }
.strip-progress { height: 110px; width: 8px; margin: 14px auto 0; border: 1px solid rgba(234,247,255,.28); background: rgba(234,247,255,.1); position: relative; }
.strip-progress b { position: absolute; left: 0; bottom: 0; width: 100%; height: calc(var(--progress) * 1%); background: var(--mint); box-shadow: 0 0 12px var(--mint); }

main { position: relative; z-index: 1; }
.chapter {
  position: relative;
  min-height: 112vh;
  overflow: hidden;
  padding: 9vh 8vw 10vh 12vw;
  isolation: isolate;
}
.chapter::before {
  content: attr(data-step);
  position: absolute;
  right: 5vw;
  top: 4vh;
  font: 700 clamp(58px, 10vw, 150px) "Chakra Petch", Impact, sans-serif;
  color: transparent;
  -webkit-text-stroke: 1px rgba(234,247,255,.18);
  opacity: .7;
}
.chapter-label {
  position: absolute;
  left: 12vw;
  top: 6vh;
  display: grid;
  gap: 5px;
  text-transform: uppercase;
  z-index: 4;
}
.chapter-label span { font: 700 15px "Azeret Mono", ui-monospace, monospace; color: var(--orange); letter-spacing: .08em; }
.chapter-label b { color: rgba(234,247,255,.66); font-size: 13px; letter-spacing: .12em; font-weight: 600; }

.manual-card {
  position: relative;
  width: min(520px, 43vw);
  padding: 28px 30px;
  color: var(--ink);
  background: rgba(234,247,255,.92);
  border: 1px solid rgba(84,230,242,.55);
  box-shadow: 16px 18px 0 rgba(27,36,51,.86), inset 0 0 36px rgba(84,230,242,.18);
  clip-path: polygon(0 0, 82% 0, 100% 18%, 100% 100%, 12% 100%, 0 87%);
}
.kicker { display: inline-block; color: var(--red); font: 700 12px "Azeret Mono", ui-monospace, monospace; letter-spacing: .08em; border: 1px solid currentColor; padding: 5px 8px; transform: rotate(-2deg); }
h1, h2 { font-family: "Chakra Petch", "Arial Black", Impact, sans-serif; text-transform: uppercase; letter-spacing: -.04em; line-height: .87; margin: .28em 0; }
h1 { font-size: clamp(48px, 7.8vw, 118px); }
h2 { font-size: clamp(40px, 6vw, 86px); }
p { font-size: clamp(18px, 2vw, 24px); line-height: 1.32; margin: 0; }
code, .part-readout { font-family: "Azeret Mono", ui-monospace, monospace; }
.fraunces { font-family: "Fraunces", Georgia, serif; }

.leaders { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; pointer-events: none; }
.leaders path { fill: none; stroke: rgba(234,247,255,.68); stroke-width: 1.4; stroke-dasharray: 7 7; vector-effect: non-scaling-stroke; }
.leaders circle { fill: var(--orange); stroke: var(--paper); stroke-width: 2; }
.callout {
  position: absolute;
  z-index: 5;
  max-width: 170px;
  color: var(--paper);
  font-family: "IBM Plex Sans Condensed", "Arial Narrow", sans-serif;
  text-transform: uppercase;
}
.callout b { display: inline-grid; place-items: center; width: 32px; height: 32px; margin-right: 6px; background: var(--orange); color: var(--ink); clip-path: polygon(0 0,100% 0,84% 100%,0 100%); }
.callout span { font-size: 13px; color: rgba(234,247,255,.72); }
.c01 { left: 11vw; top: 17vh; }.c02 { right: 13vw; top: 14vh; }.c03 { left: 11vw; bottom: 20vh; }

.iso-stage {
  position: absolute;
  inset: 6vh 7vw 8vh 13vw;
  perspective: 1200px;
  transform-style: preserve-3d;
}
.glass-plate {
  position: absolute;
  left: 12%;
  top: 20%;
  width: 72%;
  height: 46%;
  border: 1px solid rgba(84,230,242,.55);
  background: linear-gradient(135deg, rgba(84,230,242,.08), rgba(234,247,255,.02));
  box-shadow: 0 0 44px rgba(84,230,242,.12), inset 0 0 60px rgba(84,230,242,.08);
  transform: rotateX(58deg) rotateZ(-30deg) translateZ(0);
}
.plate-top { translate: 0 -84px; }.plate-mid { translate: 0 84px; border-color: rgba(91,75,255,.55); }
.letter-rig { position: absolute; inset: 0; transform-style: preserve-3d; transition: transform .8s cubic-bezier(.2,1,.25,1); }
.acrylic-letter {
  --drop: 0px;
  --spin: 0deg;
  position: absolute;
  width: clamp(68px, 9vw, 130px);
  height: clamp(76px, 10vw, 142px);
  border: 1px solid rgba(234,247,255,.42);
  color: rgba(27,36,51,.92);
  font: 700 clamp(52px, 8vw, 112px)/.9 "Chakra Petch", Impact, sans-serif;
  cursor: pointer;
  text-transform: uppercase;
  box-shadow: 14px 16px 0 rgba(27,36,51,.58), inset 0 0 18px rgba(234,247,255,.36);
  transform: translateY(var(--drop)) rotate(var(--spin)) skewY(-8deg);
  transition: transform .65s cubic-bezier(.18,1.45,.28,1), filter .25s;
  clip-path: polygon(8% 0, 62% 0, 69% 13%, 100% 13%, 100% 76%, 88% 76%, 80% 100%, 0 100%, 0 24%, 8% 24%);
}
.acrylic-letter:hover { filter: brightness(1.2) drop-shadow(0 0 12px currentColor); }
.acrylic-letter.cyan { background: rgba(84,230,242,.72); }.acrylic-letter.orange { background: rgba(255,138,61,.76); }.acrylic-letter.mint { background: rgba(108,255,184,.72); }.acrylic-letter.red { background: rgba(255,61,90,.74); color: var(--paper); }.acrylic-letter.violet { background: rgba(91,75,255,.74); color: var(--paper); }.acrylic-letter.paper { background: rgba(234,247,255,.82); }
.acrylic-letter.small { font-size: clamp(42px, 6vw, 84px); }.acrylic-letter.dot { width: clamp(48px, 6vw, 84px); }
.acrylic-letter:nth-child(1){left:23%;top:22%;--drop:-80px;--spin:-13deg}.acrylic-letter:nth-child(2){left:33%;top:17%;--drop:35px;--spin:8deg}.acrylic-letter:nth-child(3){left:43%;top:25%;--drop:-48px;--spin:14deg}.acrylic-letter:nth-child(4){left:53%;top:18%;--drop:70px;--spin:-8deg}.acrylic-letter:nth-child(5){left:63%;top:28%;--drop:-62px;--spin:11deg}.acrylic-letter:nth-child(6){left:30%;top:56%;--drop:54px;--spin:-18deg}.acrylic-letter:nth-child(7){left:40%;top:52%;--drop:-38px;--spin:6deg}.acrylic-letter:nth-child(8){left:49%;top:56%;--drop:76px;--spin:-10deg}.acrylic-letter:nth-child(9){left:59%;top:53%;--drop:-52px;--spin:12deg}.acrylic-letter:nth-child(10){left:69%;top:49%;--drop:42px;--spin:-6deg}
.hero.compress .acrylic-letter { --drop: 0px; --spin: 0deg; }
.loose-pin { position: absolute; width: 28px; height: 28px; border-radius: 50%; background: radial-gradient(circle at 32% 28%, var(--paper), var(--orange) 38%, #9e4e14 75%); box-shadow: 8px 9px 0 rgba(27,36,51,.66); cursor: pointer; transition: transform .28s cubic-bezier(.2,1.7,.28,1); }
.loose-pin.locked { transform: translateY(12px) scale(.9); box-shadow: 3px 4px 0 rgba(27,36,51,.66), 0 0 16px var(--orange); }
.p1 { left: 16%; top: 67%; }.p2 { right: 19%; top: 19%; }.p3 { right: 12%; bottom: 20%; }
.hero-card { position: absolute; left: 12vw; bottom: 8vh; }

.parts-tray { position: absolute; inset: 18vh 9vw 18vh 16vw; transform: rotateX(58deg) rotateZ(-30deg); transform-style: preserve-3d; }
.part {
  position: absolute;
  display: grid;
  place-items: center;
  gap: 4px;
  width: 210px;
  height: 124px;
  padding: 16px;
  border: 1px solid rgba(234,247,255,.48);
  background: rgba(84,230,242,.18);
  color: var(--paper);
  box-shadow: 18px 18px 0 rgba(27,36,51,.72), inset 0 0 42px rgba(84,230,242,.18);
  cursor: pointer;
  transform: translateZ(0);
  transition: transform .35s cubic-bezier(.2,1.4,.28,1), background .25s;
}
.part:hover { transform: translateZ(54px); background: rgba(84,230,242,.32); }
.part i { width: 64px; height: 36px; background: var(--cyan); box-shadow: inset 0 0 0 8px rgba(234,247,255,.18); }
.part span { font: 700 20px "Chakra Petch", Impact, sans-serif; text-transform: uppercase; }.part code { font-size: 10px; color: rgba(234,247,255,.7); }
.part.capsule { left: 6%; top: 4%; clip-path: polygon(10% 0,90% 0,100% 50%,90% 100%,10% 100%,0 50%); }.part.tray { left: 36%; top: 7%; }.part.hook { left: 63%; top: 27%; clip-path: polygon(0 0,70% 0,70% 30%,100% 30%,100% 100%,0 100%); }.part.void { left: 22%; top: 50%; background: rgba(11,18,32,.5); border-style: dashed; }.part.redblock { left: 54%; top: 58%; background: rgba(255,61,90,.38); }
.part.redblock i { background: var(--red); }.part.void i { background: transparent; border: 2px dashed var(--paper); }
.inventory-leaders { opacity: .8; }.narrative { position: absolute; right: 9vw; bottom: 11vh; width: 360px; color: rgba(234,247,255,.78); font-size: 21px; }

.rail-maze { position: absolute; left: 13vw; top: 18vh; width: 62vw; height: 64vh; transform: rotateX(58deg) rotateZ(-30deg); transform-style: preserve-3d; }
.rail { position: absolute; height: 46px; border: 1px solid rgba(84,230,242,.7); background: rgba(234,247,255,.08); box-shadow: inset 0 0 18px rgba(84,230,242,.16); }
.rail span { position: absolute; top: -24px; left: 8px; font: 700 12px "Azeret Mono"; color: var(--orange); text-transform: uppercase; }
.r1 { left: 6%; top: 14%; width: 72%; }.r2 { left: 24%; top: 33%; width: 54%; transform: rotate(90deg); transform-origin: left center; }.r3 { left: 18%; top: 58%; width: 70%; }.r4 { left: 58%; top: 8%; width: 44%; transform: rotate(90deg); transform-origin: left center; }
.slider-marble, .dep-marble { position: absolute; width: 38px; height: 38px; border: 0; border-radius: 50%; background: radial-gradient(circle at 30% 25%, var(--paper), var(--mint) 42%, #1fa56b 78%); box-shadow: 8px 9px 0 rgba(27,36,51,.68); cursor: pointer; transition: offset-distance .9s cubic-bezier(.2,1,.3,1), transform .25s; }
.slider-marble:hover, .dep-marble:hover { transform: scale(1.15); }.m1 { left: 16%; top: 15%; }.m2 { left: 42%; top: 59%; background: radial-gradient(circle at 30% 25%, var(--paper), var(--orange) 42%, #9e4e14 78%); }.m3 { left: 72%; top: 35%; background: radial-gradient(circle at 30% 25%, var(--paper), var(--violet) 42%, #2d248f 78%); }
.rail-card { position: absolute; right: 8vw; bottom: 11vh; background: rgba(108,255,184,.9); }

.test-rig { position: absolute; left: 14vw; top: 22vh; width: 64vw; height: 48vh; transform: rotateX(58deg) rotateZ(-30deg); background: rgba(234,247,255,.07); border: 1px solid rgba(84,230,242,.36); box-shadow: 28px 30px 0 rgba(27,36,51,.7), inset 0 0 60px rgba(84,230,242,.13); }
.socket-switch { position: absolute; width: 130px; height: 130px; border: 1px solid rgba(234,247,255,.5); cursor: pointer; font: 700 24px "Chakra Petch"; color: var(--ink); box-shadow: 10px 12px 0 rgba(27,36,51,.72), inset 0 0 0 10px rgba(234,247,255,.2); clip-path: polygon(0 0,40% 0,47% 12%,59% 12%,66% 0,100% 0,100% 100%,0 100%); }
.socket-switch.pass { background: var(--mint); }.socket-switch.fail { background: var(--red); color: var(--paper); }
.socket-switch:nth-child(1){left:8%;top:16%}.socket-switch:nth-child(2){left:31%;top:45%}.socket-switch:nth-child(3){left:54%;top:18%}.socket-switch:nth-child(4){left:76%;top:48%}
.socket-switch.pressed { transform: translate(6px, 7px); box-shadow: 3px 4px 0 rgba(27,36,51,.72), inset 0 0 0 10px rgba(234,247,255,.2); }
.socket-switch.shake { animation: shake .42s cubic-bezier(.36,.07,.19,.97); }
@keyframes shake { 10%,90%{translate:-2px 0}20%,80%{translate:5px 0}30%,50%,70%{translate:-8px 0}40%,60%{translate:8px 0} }
.magnifier { position: absolute; right: 2%; top: -9%; width: 178px; height: 178px; border-radius: 50%; border: 10px solid var(--paper); box-shadow: 12px 14px 0 rgba(27,36,51,.8), inset 0 0 34px rgba(255,61,90,.2); display: grid; place-items: center; color: var(--red); font: 700 13px "Azeret Mono"; text-transform: uppercase; transform: rotate(30deg); }
.magnifier::after { content: ""; position: absolute; width: 86px; height: 16px; background: var(--paper); right: -62px; bottom: -20px; transform: rotate(40deg); box-shadow: 7px 8px 0 rgba(27,36,51,.8); }
.test-card { position: absolute; right: 8vw; bottom: 10vh; }

.lift-stack { position: absolute; left: 14vw; top: 18vh; width: 52vw; height: 62vh; perspective: 1100px; transform-style: preserve-3d; }
.floor { position: absolute; left: 8%; width: 70%; height: 42%; border: 1px solid rgba(234,247,255,.5); color: var(--paper); cursor: pointer; box-shadow: 18px 20px 0 rgba(27,36,51,.72), inset 0 0 52px rgba(84,230,242,.12); transform: rotateX(58deg) rotateZ(-30deg); transition: transform .75s cubic-bezier(.2,1.35,.3,1); }
.floor code { font-size: clamp(15px,2vw,28px); background: rgba(11,18,32,.5); padding: 10px; }
.messy { top: 6%; background: rgba(255,61,90,.42); z-index: 3; }.middle { top: 24%; background: rgba(91,75,255,.38); z-index: 2; }.clean { top: 42%; background: rgba(108,255,184,.32); z-index: 1; }
.lift.active .messy, .lift.raised .messy { transform: rotateX(58deg) rotateZ(-30deg) translateZ(160px) translateY(-70px); }.lift.raised .middle { transform: rotateX(58deg) rotateZ(-30deg) translateZ(70px) translateY(-18px); }
.elevator-screw { position: absolute; width: 32px; height: 82%; top: 8%; border: 1px solid rgba(234,247,255,.35); background: repeating-linear-gradient(0deg, var(--orange) 0 8px, transparent 9px 17px); transform: rotateX(58deg) rotateZ(-30deg); }.s1 { left: 3%; }.s2 { right: 22%; }
.lift-card { position: absolute; right: 8vw; top: 18vh; background: rgba(91,75,255,.9); color: var(--paper); }

.chute-machine { position: absolute; left: 12vw; top: 19vh; width: 68vw; height: 55vh; transform: rotateX(58deg) rotateZ(-30deg); transform-style: preserve-3d; }
.chute-svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; filter: drop-shadow(12px 14px 0 rgba(27,36,51,.65)); }
.chute-line { fill: none; stroke: rgba(234,247,255,.18); stroke-width: 54; stroke-linecap: round; }
.chute-line.a { stroke: rgba(84,230,242,.28); }.chute-line.b { stroke: rgba(255,138,61,.26); }.chute-line.merge { stroke: rgba(255,61,90,.28); stroke-width: 40; }
.dm1 { left: 9%; top: 9%; offset-path: path("M92 80 C250 70 268 206 404 202 C559 197 574 96 760 132"); offset-distance: calc(var(--chapter-progress) * 72%); }
.dm2 { left: 12%; top: 70%; background: radial-gradient(circle at 30% 25%, var(--paper), var(--red) 42%, #8d1e31 78%); offset-path: path("M124 388 C263 271 352 393 480 305 C623 207 703 301 838 226"); offset-distance: calc(var(--chapter-progress) * 64%); }
.gate-pin { position: absolute; left: 48%; top: 43%; width: 70px; height: 70px; border-radius: 50%; border: 0; background: var(--orange); color: var(--ink); font: 700 13px "Azeret Mono"; cursor: pointer; box-shadow: 9px 10px 0 rgba(27,36,51,.72); transition: transform .32s cubic-bezier(.2,1.6,.28,1); }
.gate-pin.locked { transform: translateY(18px) scale(.9); box-shadow: 4px 5px 0 rgba(27,36,51,.72), 0 0 20px var(--orange); }
.chute-card { position: absolute; right: 7vw; bottom: 10vh; background: rgba(255,138,61,.92); }

.alignment-chamber { position: absolute; left: 12vw; top: 18vh; width: 61vw; height: 58vh; perspective: 1100px; }
.final-layer { position: absolute; left: 6%; top: 18%; width: 78%; height: 48%; border: 1px solid rgba(84,230,242,.48); background: rgba(84,230,242,.08); transform: rotateX(58deg) rotateZ(-30deg); box-shadow: 20px 22px 0 rgba(27,36,51,.68), inset 0 0 54px rgba(84,230,242,.16); transition: translate .8s cubic-bezier(.2,1,.25,1); }
.ltop { translate: 0 -110px; }.lmid { translate: 0 8px; border-color: rgba(91,75,255,.55); }.lbase { translate: 0 126px; border-color: rgba(108,255,184,.5); }
.alignment.active .ltop, .alignment.locked .ltop { translate: 0 0; }.alignment.active .lbase, .alignment.locked .lbase { translate: 0 0; }
.final-word { position: absolute; left: 13%; top: 36%; font: 700 clamp(54px, 9vw, 140px) "Chakra Petch", Impact, sans-serif; color: rgba(234,247,255,.94); text-transform: uppercase; letter-spacing: -.07em; text-shadow: 0 0 18px var(--cyan), 10px 12px 0 rgba(27,36,51,.9); opacity: .25; transform: translateY(60px) skewY(-8deg); transition: opacity .8s, transform .8s cubic-bezier(.2,1.3,.3,1); }
.final-word span { color: var(--mint); font-size: .46em; letter-spacing: -.03em; }
.alignment.active .final-word, .alignment.locked .final-word { opacity: 1; transform: translateY(0) skewY(-8deg); }
.open-hatch { position: absolute; right: 7%; bottom: 14%; width: 170px; height: 110px; color: var(--paper); border: 1px dashed rgba(234,247,255,.55); background: rgba(11,18,32,.44); display: grid; place-items: center; font: 700 12px "Azeret Mono"; box-shadow: inset 0 0 24px rgba(84,230,242,.14); transform: rotateX(58deg) rotateZ(-30deg); }
.open-hatch i { width: 58px; height: 38px; background: rgba(84,230,242,.35); clip-path: polygon(0 0,100% 0,82% 100%,0 78%); }
.final-card { position: absolute; right: 7vw; bottom: 8vh; }

.part-readout {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 30;
  transform: translate(-50%, 120px);
  padding: 12px 16px;
  color: var(--paper);
  background: rgba(27,36,51,.94);
  border: 1px solid var(--cyan);
  box-shadow: 8px 9px 0 rgba(0,0,0,.44);
  font-size: 12px;
  text-transform: uppercase;
  transition: transform .28s cubic-bezier(.2,1.45,.28,1), border-color .2s;
}
.part-readout.visible { transform: translate(-50%, 0); }.part-readout.good { border-color: var(--mint); }.part-readout.bad { border-color: var(--red); }

@media (max-width: 860px) {
  .step-strip { display: none; }
  .chapter { padding: 8vh 5vw; min-height: 118vh; }
  .chapter-label { left: 5vw; }
  .manual-card { width: auto; max-width: none; }
  .hero-card, .rail-card, .test-card, .lift-card, .chute-card, .final-card { left: 5vw; right: 5vw; bottom: 6vh; top: auto; position: absolute; }
  .iso-stage, .parts-tray, .rail-maze, .test-rig, .lift-stack, .chute-machine, .alignment-chamber { left: 2vw; right: 2vw; width: 96vw; transform: scale(.72); transform-origin: center top; }
  .parts-tray, .rail-maze, .test-rig, .chute-machine { transform: scale(.72) rotateX(58deg) rotateZ(-30deg); }
  .narrative { display: none; }
}