:root {
  --night: #080611;
  --shadow: #151026;
  --cyan: #00F5FF;
  --magenta: #FF2BD6;
  --green: #B6FF00;
  --amber: #FFB000;
  --white: #F4F7FF;
  --display: "Bebas Neue", Impact, sans-serif;
  --ui: "Space Grotesk", "Inter", system-ui, sans-serif;
  --kr: "Noto Sans KR", system-ui, sans-serif;
  --mono: "IBM Plex Mono", monospace;
}

/* Compliance tokens: Mono* Mono** very sparingly coordinate tags and build-step IDs only; Space Grotesk* Grotesk** from Google Fonts for tutorial labels. */

* { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  color: var(--white);
  font-family: var(--ui);
  overflow-x: hidden;
  background:
    radial-gradient(circle at 18% 18%, rgba(0, 245, 255, 0.15), transparent 24rem),
    radial-gradient(circle at 78% 26%, rgba(255, 43, 214, 0.14), transparent 28rem),
    linear-gradient(180deg, #080611 0%, #151026 46%, #080611 100%);
}

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

.orb {
  position: absolute;
  width: 30vw;
  height: 30vw;
  min-width: 220px;
  min-height: 220px;
  border-radius: 50%;
  filter: blur(38px);
  opacity: 0.45;
  animation: focusPulse 7s ease-in-out infinite alternate;
}

.orb-cyan { left: -8vw; top: 8vh; background: #00F5FF; }
.orb-magenta { right: -6vw; top: 22vh; background: #FF2BD6; animation-delay: -2s; }
.orb-green { left: 44vw; bottom: -11vw; background: #B6FF00; opacity: 0.18; animation-delay: -4s; }
.orb-amber { right: 24vw; bottom: 10vh; background: #FFB000; opacity: 0.18; animation-delay: -1s; }

.pixel-rain {
  position: absolute;
  inset: 0;
  opacity: 0.55;
  background-image:
    linear-gradient(#00F5FF 0 0), linear-gradient(#FF2BD6 0 0), linear-gradient(#B6FF00 0 0), linear-gradient(#FFB000 0 0),
    linear-gradient(#F4F7FF 0 0), linear-gradient(#00F5FF 0 0), linear-gradient(#FF2BD6 0 0), linear-gradient(#FFB000 0 0);
  background-size: 4px 4px, 6px 6px, 3px 3px, 5px 5px, 3px 3px, 4px 4px, 5px 5px, 4px 4px;
  background-position: 12% 18%, 80% 13%, 56% 30%, 26% 67%, 91% 76%, 38% 48%, 70% 58%, 14% 84%;
  background-repeat: no-repeat;
  animation: rainDrift 9s steps(6) infinite;
}

.edge-hud {
  position: fixed;
  left: 18px;
  top: 18px;
  bottom: 18px;
  width: 82px;
  z-index: 6;
  border-left: 2px solid rgba(0, 245, 255, 0.7);
  border-right: 1px solid rgba(255, 43, 214, 0.32);
  background: linear-gradient(180deg, rgba(8, 6, 17, 0.72), rgba(21, 16, 38, 0.32));
  box-shadow: 0 0 24px rgba(0, 245, 255, 0.15);
  padding: 16px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.hud-title, .hud-stage, .hud-coords {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.13em;
  color: var(--cyan);
  writing-mode: vertical-rl;
  text-transform: uppercase;
}

.hud-stage { color: var(--green); font-weight: 700; }
.hud-coords { margin-top: auto; color: var(--amber); }
.hud-track { display: flex; flex-direction: column; gap: 12px; margin-top: 22px; }
.hud-tick { width: 16px; height: 16px; border: 2px solid #00F5FF; background: #080611; box-shadow: 0 0 12px rgba(0,245,255,.25); }
.hud-tick.is-active { background: #B6FF00; border-color: #B6FF00; box-shadow: 0 0 18px rgba(182,255,0,.75); }

.site-shell { position: relative; z-index: 1; }

.stage {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  padding: 8vh 8vw 8vh 12vw;
  isolation: isolate;
  border-bottom: 1px solid rgba(0, 245, 255, 0.12);
}

.stage::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background: linear-gradient(140deg, rgba(8,6,17,.2), rgba(21,16,38,.55), rgba(8,6,17,.25));
}

.scene-grid {
  position: absolute;
  inset: -20px;
  z-index: -1;
  opacity: 0.26;
  background-image:
    linear-gradient(rgba(0,245,255,.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,245,255,.18) 1px, transparent 1px),
    linear-gradient(rgba(255,43,214,.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,43,214,.12) 1px, transparent 1px);
  background-size: 12px 12px, 12px 12px, 96px 96px, 96px 96px;
  transform: skewY(-4deg) translateY(var(--grid-shift, 0px));
  image-rendering: pixelated;
}

.giant-wordmark {
  position: absolute;
  left: 10vw;
  top: -2vh;
  width: 118vw;
  font-family: var(--display);
  font-size: clamp(6.8rem, 19vw, 18rem);
  line-height: .78;
  letter-spacing: -0.035em;
  color: rgba(244, 247, 255, 0.05);
  text-transform: uppercase;
  -webkit-text-stroke: 2px #00F5FF;
  text-shadow: 8px 8px 0 rgba(255,43,214,.42), 0 0 42px rgba(0,245,255,.55);
  transform: rotate(-7deg) translateX(calc(var(--progress, 0) * -40px));
}

.giant-wordmark::after {
  content: attr(data-text);
  position: absolute;
  left: 18px;
  top: 18px;
  color: rgba(255, 43, 214, 0.13);
  -webkit-text-stroke: 1px #FF2BD6;
}

.tutorial-label {
  position: absolute;
  max-width: 370px;
  padding: 18px 18px 16px;
  background: rgba(8, 6, 17, 0.84);
  border: 2px solid #00F5FF;
  color: #F4F7FF;
  box-shadow: 8px 8px 0 rgba(255,43,214,.45), 0 0 30px rgba(0,245,255,.18);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.tutorial-label strong { display: block; font-size: clamp(1.1rem, 2.5vw, 1.7rem); line-height: 1.05; color: var(--green); text-transform: uppercase; }
.tutorial-label small, .stage-copy { display: block; margin-top: 10px; color: rgba(244,247,255,.78); line-height: 1.55; }
.step-id { display: block; margin-bottom: 9px; font-family: var(--mono); font-size: 11px; letter-spacing: .17em; color: var(--amber); }
.label-intro { right: 10vw; top: 42vh; }
.label-scaffold { right: 8vw; bottom: 18vh; }
.label-snap { left: 12vw; bottom: 10vh; }
.label-final { right: 9vw; top: 28vh; }

.foundation-blocks {
  position: absolute;
  left: 12vw;
  bottom: 12vh;
  display: grid;
  grid-template-columns: repeat(8, 42px);
  gap: 8px;
}

.foundation-blocks span, .tile, .socket, .tower, .bridge {
  image-rendering: pixelated;
  box-shadow: inset 0 0 0 2px rgba(244,247,255,.12), 0 0 22px rgba(0,245,255,.2);
}

.foundation-blocks span {
  height: 42px;
  background: linear-gradient(135deg, #151026, #00F5FF 52%, #080611 53%);
  transform: translateY(calc(80px - var(--progress, 0) * 80px));
  opacity: calc(.25 + var(--progress, 0) * .75);
}
.foundation-blocks span:nth-child(even) { background: linear-gradient(135deg, #151026, #FF2BD6 52%, #080611 53%); }

.crosshair { position: absolute; width: 78px; height: 78px; border: 2px dotted #00F5FF; box-shadow: 0 0 20px rgba(0,245,255,.35); }
.crosshair::before, .crosshair::after { content:""; position:absolute; background:#B6FF00; }
.crosshair::before { left: 50%; top: -18px; width: 2px; height: 112px; }
.crosshair::after { top: 50%; left: -18px; height: 2px; width: 112px; }
.crosshair-a { left: 34vw; top: 36vh; }
.crosshair-b { right: 18vw; bottom: 20vh; transform: scale(.72); }

.hangul-stamp {
  position: absolute;
  font-family: var(--kr);
  font-weight: 900;
  color: rgba(244,247,255,.08);
  -webkit-text-stroke: 1px rgba(182,255,0,.72);
  text-shadow: 0 0 18px rgba(182,255,0,.3);
}
.stamp-one { left: 68vw; top: 12vh; font-size: clamp(5rem, 13vw, 12rem); transform: rotate(8deg); }
.stamp-two { left: 11vw; top: 14vh; font-size: clamp(4rem, 10vw, 9rem); transform: rotate(-5deg); }

.control-button {
  position: absolute;
  right: 10vw;
  bottom: 8vh;
  padding: 14px 18px;
  font-family: var(--display);
  font-size: 1.7rem;
  letter-spacing: .04em;
  color: #080611;
  text-decoration: none;
  background: #B6FF00;
  border: 0;
  cursor: pointer;
  box-shadow: 7px 7px 0 #FF2BD6, 0 0 26px rgba(182,255,0,.35);
  transition: transform .16s steps(2), box-shadow .16s steps(2);
}
.control-button:hover, .control-button.is-snapping { transform: translate(7px, 7px); box-shadow: 0 0 0 #FF2BD6, 0 0 38px rgba(255,43,214,.55); }

.stage-number {
  position: absolute;
  top: 5vh;
  left: 11vw;
  font-family: var(--display);
  font-size: clamp(8rem, 24vw, 24rem);
  line-height: .8;
  color: rgba(244,247,255,.035);
  -webkit-text-stroke: 2px #FF2BD6;
  text-shadow: 10px 10px 0 rgba(0,245,255,.22);
}

.command-title {
  position: relative;
  z-index: 2;
  max-width: 660px;
  margin: 18vh 0 0 12vw;
  font-family: var(--display);
  font-size: clamp(4rem, 10vw, 11rem);
  line-height: .82;
  letter-spacing: -.02em;
  color: #F4F7FF;
  text-shadow: 6px 6px 0 #151026, 10px 10px 0 rgba(255,176,0,.72), 0 0 30px rgba(0,245,255,.34);
}

.stage-copy { position: relative; z-index: 2; max-width: 430px; margin-left: 12.5vw; font-size: 1.05rem; }

.scaffold-rig {
  position: absolute;
  right: 10vw;
  top: 16vh;
  width: min(43vw, 560px);
  height: 62vh;
  transform: translateY(calc(90px - var(--progress, 0) * 90px));
}
.beam { position: absolute; display:block; background:#00F5FF; box-shadow: 0 0 20px rgba(0,245,255,.65); transform-origin: bottom left; }
.vertical { width: 8px; height: calc(20% + var(--progress, 0) * 58%); bottom: 0; }
.horizontal { height: 8px; width: calc(12% + var(--progress, 0) * 72%); left: 6%; }
.v1 { left: 10%; } .v2 { left: 46%; background:#FFB000; } .v3 { right: 10%; }
.h1 { bottom: 12%; } .h2 { bottom: 43%; background:#FFB000; } .h3 { bottom: 73%; }
.diagonal { width: calc(20% + var(--progress, 0) * 78%); height: 6px; bottom: 18%; left: 9%; transform: rotate(-33deg) scaleX(var(--progress, .05)); background:#FF2BD6; }
.d2 { bottom: 58%; transform: rotate(26deg) scaleX(var(--progress, .05)); background:#B6FF00; }
.node { position:absolute; width:18px; height:18px; background:#FFB000; box-shadow:0 0 18px rgba(255,176,0,.9); }
.n1 { left:8%; bottom:10%; } .n2 { left:44%; bottom:41%; } .n3 { right:8%; bottom:72%; } .n4 { right:8%; bottom:10%; }
.pixel-icon.crane-hook { position:absolute; left:23vw; bottom:15vh; width:56px; height:84px; border-left:10px solid #FFB000; border-bottom:10px solid #FFB000; filter: drop-shadow(0 0 12px #FFB000); transform: rotate(-15deg); }

.snap-board { position:absolute; right:8vw; top:14vh; width:min(56vw, 780px); height:64vh; border:2px dashed rgba(0,245,255,.55); background:rgba(21,16,38,.32); }
.socket { position:absolute; width:92px; height:92px; border:3px dashed #00F5FF; background:rgba(0,245,255,.04); }
.s1 { left:10%; top:18%; } .s2 { right:18%; top:12%; } .s3 { left:28%; bottom:16%; } .s4 { right:10%; bottom:22%; }
.tile {
  position:absolute;
  width:86px;
  height:86px;
  display:grid;
  place-items:center;
  font-family:var(--kr);
  font-weight:900;
  color:#080611;
  transform: translate(calc((1 - var(--progress, 0)) * 120px), calc((1 - var(--progress, 0)) * -80px));
  transition: transform .4s steps(4);
}
.tile-cyan { left:11%; top:19%; background:#00F5FF; }
.tile-magenta { right:19%; top:13%; background:#FF2BD6; color:#F4F7FF; transform: translate(calc((1 - var(--progress, 0)) * -140px), calc((1 - var(--progress, 0)) * 120px)); }
.tile-green { left:29%; bottom:17%; background:#B6FF00; font-size:1.1rem; }
.tile-amber { right:11%; bottom:23%; background:#FFB000; transform: translate(calc((1 - var(--progress, 0)) * 180px), calc((1 - var(--progress, 0)) * 20px)); }
.guide-svg { position:absolute; inset:7vh 4vw auto auto; width:70vw; max-width:900px; height:70vh; pointer-events:none; }
.guide-line { fill:none; stroke:#00F5FF; stroke-width:4; stroke-dasharray:12 14; stroke-dashoffset:calc(700 - var(--progress, 0) * 700); filter:drop-shadow(0 0 8px #00F5FF); }
.line-two { stroke:#FF2BD6; }

.studio-silhouette { position:absolute; left:12vw; bottom:8vh; width:58vw; height:68vh; }
.tower { position:absolute; bottom:0; width:16%; background:linear-gradient(180deg, #00F5FF, #151026); border:2px solid #00F5FF; transform: translateY(calc(170px - var(--progress,0) * 170px)); }
.t1 { left:4%; height:45%; } .t2 { left:23%; height:72%; background:linear-gradient(180deg,#FF2BD6,#151026); border-color:#FF2BD6; } .t3 { left:43%; height:56%; background:linear-gradient(180deg,#B6FF00,#151026); border-color:#B6FF00; }
.bridge { position:absolute; left:13%; height:10px; background:#FFB000; box-shadow:0 0 20px rgba(255,176,0,.65); transform:scaleX(var(--progress,.05)); transform-origin:left; }
.b1 { bottom:42%; width:48%; } .b2 { bottom:62%; width:36%; left:24%; }
.sign { position:absolute; left:7%; bottom:18%; font-family:var(--display); font-size:clamp(3rem,8vw,9rem); color:#080611; background:#F4F7FF; padding:0 .12em; box-shadow:8px 8px 0 #FF2BD6; }
.weld { position:absolute; width:10px; height:10px; background:#F4F7FF; box-shadow:0 0 14px #F4F7FF, 14px -8px 0 #B6FF00, -10px 12px 0 #FFB000; animation:weldSpark .8s steps(2) infinite; }
.w1 { left:22%; bottom:43%; } .w2 { left:50%; bottom:63%; animation-delay:-.25s; } .w3 { left:62%; bottom:20%; animation-delay:-.5s; }
.inspect { bottom:9vh; right:10vw; }

.is-current .tutorial-label { animation: labelLock .5s steps(3) both; }
.is-current .crosshair { animation: blinkSnap 1.2s steps(2) infinite; }

@keyframes focusPulse { from { transform: scale(.92); filter: blur(52px); } to { transform: scale(1.14); filter: blur(30px); } }
@keyframes rainDrift { 0% { transform: translateY(0); } 100% { transform: translateY(42px); } }
@keyframes labelLock { 0% { transform: translate(22px, -18px); opacity:.35; } 70% { transform: translate(-6px, 5px); } 100% { transform: translate(0, 0); opacity:1; } }
@keyframes blinkSnap { 50% { border-color:#FF2BD6; filter:drop-shadow(0 0 12px #FF2BD6); } }
@keyframes weldSpark { 50% { opacity:.25; transform:translate(3px,-3px); } }

@media (max-width: 760px) {
  .edge-hud { display: none; }
  .stage { padding: 8vh 6vw; }
  .giant-wordmark { left: 2vw; top: 8vh; font-size: 26vw; }
  .label-intro, .label-scaffold, .label-snap, .label-final { left: 6vw; right: 6vw; top: auto; bottom: 10vh; max-width: none; }
  .foundation-blocks { left: 6vw; grid-template-columns: repeat(4, 42px); bottom: 30vh; }
  .command-title, .stage-copy { margin-left: 0; }
  .scaffold-rig, .snap-board, .studio-silhouette { left: 6vw; right: auto; width: 88vw; }
  .control-button { right: 6vw; }
}