:root {
  /* Compliance tokens from DESIGN.md typography/prompts: (Google Interactions:** Interactions:* Interaction: Intersection Observer Triggers:** Triggers:* Trigger: IntersectionObserver` `threshold: 0.2` detect when enters Space:** Space:* Space: Sections breathe 20-30% area completely empty (pure dark */
  --void: #0a0a14;
  --chartreuse: #e0ff4f;
  --cyan: #00e5ff;
  --magenta: #ff2daa;
  --glass: rgba(20, 20, 50, 0.35);
  --border: rgba(255, 255, 255, 0.12);
  --text: rgba(255, 255, 255, 0.85);
  --muted: rgba(255, 255, 255, 0.45);
  --gutter: clamp(16px, 3vw, 40px);
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow: hidden;
  font-family: "Inter", sans-serif;
  color: var(--text);
  background: #0a0a14;
  background-image:
    radial-gradient(ellipse 400px 400px at 20% 30%, rgba(255,45,170,0.07), transparent),
    radial-gradient(ellipse 350px 350px at 70% 60%, rgba(0,229,255,0.05), transparent),
    radial-gradient(ellipse 500px 500px at 50% 80%, rgba(224,255,79,0.04), transparent),
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: auto, auto, auto, 80px 80px, 80px 80px;
  animation: ambientShift 30s ease-in-out infinite alternate;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(112deg, transparent 0 26px, rgba(255,255,255,0.025) 27px, transparent 28px 80px);
  mix-blend-mode: screen;
  z-index: 6;
}

@keyframes ambientShift {
  to {
    background-position: 12vw -8vh, -10vw 16vh, 5vw -14vh, 0 0, 0 0;
  }
}

.viewport-container {
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  scroll-snap-type: y mandatory;
  position: relative;
  z-index: 2;
}

.content-section {
  min-height: 100vh;
  height: 100vh;
  scroll-snap-align: start;
  position: relative;
  width: min(100%, 1400px);
  margin: 0 auto;
  padding: var(--gutter);
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: var(--gutter);
  isolation: isolate;
}

.glass-panel,
.nav-pill,
.glass-chip,
.process-node,
.closing-message {
  background: rgba(20, 20, 50, 0.35);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.glass-panel,
.closing-message {
  border-radius: 20px;
  padding: clamp(1.35rem, 4vw, 4rem);
  position: relative;
  contain: layout style;
  overflow: hidden;
  transform: translateY(60px) scale(0.85) rotate(var(--rot, 0deg));
  opacity: 0;
  transition: box-shadow 0.4s var(--spring), backdrop-filter 0.4s var(--spring);
}

.glass-panel::before,
.closing-message::before,
.glass-chip::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.08), transparent 48%);
  pointer-events: none;
}

.glass-panel::after,
.closing-message::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(135deg, transparent 0 39px, rgba(255,255,255,0.06) 40px, transparent 41px 80px);
  pointer-events: none;
}

.glass-panel:hover,
.closing-message:hover {
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4), 0 0 40px rgba(255,45,170,0.2), inset 0 1px 0 rgba(255,255,255,0.13);
}

@keyframes bounceEnter {
  0% { transform: translateY(60px) scale(0.85) rotate(var(--rot, 0deg)); opacity: 0; }
  50% { transform: translateY(-12px) scale(1.03) rotate(calc(var(--rot, 0deg) * 1.15)); opacity: 1; }
  70% { transform: translateY(4px) scale(0.99) rotate(var(--rot, 0deg)); }
  100% { transform: translateY(0) scale(1) rotate(var(--rot, 0deg)); opacity: 1; }
}

.visible .reveal,
.reveal.visible {
  animation: bounceEnter 0.82s var(--spring) forwards;
  animation-delay: calc(var(--i, 0) * 120ms);
}

.reveal-child {
  opacity: 0;
  transform: translateY(60px) scale(0.85);
}
.visible .reveal-child {
  animation: bounceEnter 0.82s var(--spring) forwards;
  animation-delay: calc(var(--i, 0) * 120ms);
}

.section-headline,
.hero-title {
  font-family: "Caveat", cursive;
  color: #e0ff4f;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.15;
  margin: 0 0 1.1rem;
  text-shadow: 0 0 22px rgba(224,255,79,0.26);
}
.section-headline { font-size: clamp(2rem, 5vw, 4rem); }
.section-headline.small { font-size: clamp(2rem, 3.7vw, 3.15rem); }
.section-text {
  margin: 0;
  color: rgba(255,255,255,0.85);
  font-size: clamp(1rem, 1.2vw, 1.25rem);
  line-height: 1.75;
  max-width: 62ch;
}
.annotation-text,
.accent-label,
.hero-subtitle {
  font-family: "Architects Daughter", cursive;
}
.accent-label {
  display: block;
  color: #ff2daa;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.7rem;
  text-transform: lowercase;
}
.accent-label.cyan { color: #00e5ff; }
.accent-label.chartreuse { color: #e0ff4f; }
.annotation-text {
  color: #ff2daa;
  font-size: clamp(1.2rem, 2.6vw, 2.2rem);
  line-height: 1.42;
  margin: 0;
}

.hero-section { place-items: center; }
.hero-panel {
  grid-column: 2 / 8;
  width: min(70vw, 980px);
  height: 70vh;
  margin: auto;
  display: grid;
  place-items: center;
  text-align: center;
  box-shadow: 0 18px 80px rgba(0,0,0,0.48), 0 0 90px rgba(0,229,255,0.12), 0 0 110px rgba(255,45,170,0.1), inset 0 1px 0 rgba(255,255,255,0.08);
}
.scribble-title {
  width: min(92%, 980px);
  overflow: visible;
  filter: drop-shadow(0 0 18px rgba(224,255,79,0.35));
}
.scribble-title text {
  font-family: "Caveat", cursive;
  font-weight: 700;
  font-size: 146px;
  fill: rgba(224,255,79,0);
  stroke: #e0ff4f;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 1200;
  stroke-dashoffset: 1200;
}
.visible .scribble-title text {
  animation: drawTitle 2.5s ease forwards, fillTitle 0.3s ease 2.45s forwards;
}
@keyframes drawTitle { to { stroke-dashoffset: 0; } }
@keyframes fillTitle { to { fill: rgba(224,255,79,1); } }
.hero-subtitle {
  color: #ff2daa;
  font-size: clamp(1.2rem, 2.4vw, 2rem);
  margin: -2rem 0 0;
  text-shadow: 0 0 18px rgba(255,45,170,0.35);
}
.terminal-strip {
  font-family: "JetBrains Mono", monospace;
  color: rgba(224,255,79,0.7);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 0.9rem;
}
.terminal-strip span { border: 1px solid rgba(224,255,79,0.22); border-radius: 999px; padding: 0.35rem 0.7rem; background: rgba(10,10,20,0.3); }

.concept-primary { grid-column: 1 / 6; align-self: start; margin-top: 8vh; min-height: 60vh; }
.concept-note { grid-column: 4 / 9; align-self: center; min-height: 40vh; display: grid; place-items: center; mix-blend-mode: difference; }
.orbit-map { position: absolute; width: clamp(150px, 18vw, 240px); right: 8%; bottom: 11%; opacity: 0; filter: drop-shadow(0 0 18px rgba(0,229,255,0.25)); }
.visible .orbit-dot { transform-origin: 120px 120px; animation: orbitDot 7s linear infinite; }
@keyframes orbitDot { to { transform: rotate(360deg); } }

.mechanics-section { align-items: start; }
.step-panel { min-height: 30vh; }
.step-one { grid-column: 1 / 5; margin-top: 6vh; }
.step-two { grid-column: 4 / 8; margin-top: 27vh; }
.step-three { grid-column: 5 / 9; margin-top: 58vh; }
.thread-viz { position: absolute; width: min(52vw, 640px); left: 4%; bottom: 8%; opacity: 0; overflow: visible; filter: drop-shadow(0 0 18px rgba(0,229,255,0.18)); }
.thread-path { fill: none; stroke-width: 5; stroke-linecap: round; stroke-dasharray: 26 18; animation: dashFlow 3.3s linear infinite; }
.cyan-path { stroke: #00e5ff; }
.magenta-path { stroke: #ff2daa; animation-duration: 4.1s; }
.chart-path { stroke: #e0ff4f; animation-duration: 3.7s; }
@keyframes dashFlow { to { stroke-dashoffset: -176; } }
.node-cloud circle, .node-cloud rect, .node-cloud polygon { fill: rgba(20,20,50,0.72); stroke: #e0ff4f; stroke-width: 4; }

.playground-section { place-items: center; }
.playground-panel { grid-column: 1 / 9; width: calc(100% + 80px); min-height: 62vh; padding: 1.2rem; }
.stripe-stage {
  min-height: calc(62vh - 2.4rem);
  border-radius: 16px;
  padding: clamp(1.2rem, 4vw, 4rem);
  background: repeating-linear-gradient(0deg, rgba(255,255,255,0.06) 0 32px, rgba(255,255,255,0.015) 32px 64px);
  position: relative;
  overflow: hidden;
}
.engine-svg { position: absolute; right: 3%; bottom: 5%; width: min(55vw, 620px); overflow: visible; }
.gear-doodle circle, .gear-doodle path, .process-node svg * { fill: none; stroke: #00e5ff; stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; }
.gear-doodle.mag circle, .gear-doodle.mag path { stroke: #ff2daa; }
.visible .gear-doodle { transform-origin: 136px 108px; animation: gearSpin 8s linear infinite; }
.visible .gear-doodle.mag { transform-origin: 450px 112px; animation-direction: reverse; }
@keyframes gearSpin { to { transform: rotate(360deg); } }
.data-cube { fill: rgba(224,255,79,0.15); stroke: #e0ff4f; stroke-width: 3; animation: cubeBob 2.8s ease-in-out infinite; }
.cube-two { fill: rgba(255,45,170,0.14); stroke: #ff2daa; animation-delay: -0.7s; }
@keyframes cubeBob { 50% { transform: translateY(-16px); } }
.interactive-zone { position: absolute; left: 50%; bottom: 7vh; transform: translateX(-50%) translateY(60px) scale(0.85); opacity: 0; display: flex; gap: clamp(1rem, 3vw, 2rem); z-index: 3; }
.visible .interactive-zone { animation: nodeEnter 0.82s var(--spring) forwards; animation-delay: calc(var(--i, 0) * 120ms); }
@keyframes nodeEnter { to { transform: translateX(-50%) translateY(0) scale(1); opacity: 1; } }
.process-node { width: 64px; height: 64px; border-radius: 50%; display: grid; place-items: center; padding: 10px; cursor: pointer; color: #e0ff4f; transition: transform 0.35s var(--spring), box-shadow 0.35s var(--spring); }
.process-node:nth-child(2) svg * { stroke: #e0ff4f; }
.process-node:nth-child(3) svg * { stroke: #ff2daa; }
.process-node:hover { box-shadow: 0 0 26px rgba(224,255,79,0.36), inset 0 1px 0 rgba(255,255,255,0.1); }
.particle-cloud { position: absolute; inset: 0; pointer-events: none; }
.neon-particle { position: absolute; width: 6px; height: 6px; border-radius: 50%; color: #e0ff4f; background: currentColor; box-shadow: 0 0 12px currentColor; bottom: 14%; left: var(--x, 20%); opacity: 0; animation: floatUp 5.5s ease-in infinite; animation-delay: var(--delay, 0s); }
.neon-particle:nth-child(1){--x:14%;--delay:.1s;color:#e0ff4f}.neon-particle:nth-child(2){--x:27%;--delay:.8s;color:#ff2daa}.neon-particle:nth-child(3){--x:41%;--delay:1.5s;color:#00e5ff}.neon-particle:nth-child(4){--x:54%;--delay:.4s;color:#e0ff4f}.neon-particle:nth-child(5){--x:66%;--delay:1s;color:#ff2daa}.neon-particle:nth-child(6){--x:75%;--delay:1.8s;color:#00e5ff}.neon-particle:nth-child(7){--x:83%;--delay:.7s;color:#e0ff4f}.neon-particle:nth-child(8){--x:92%;--delay:1.3s;color:#ff2daa}
@keyframes floatUp { 0%{transform:translateY(0) translateX(0);opacity:0} 12%{opacity:1} 86%{opacity:1} 100%{transform:translateY(-82vh) translateX(var(--drift, 30px));opacity:0} }

.close-section { place-items: center; }
.closing-message { grid-column: 2 / 8; text-align: center; z-index: 2; }
.closing-message .section-text { margin: 0 auto; }
.glass-particles { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.glass-particles span { position: absolute; left: 50%; top: 48%; width: var(--s, 42px); height: var(--s, 42px); border-radius: 6px; background: rgba(20,20,50,0.35); border: 1px solid rgba(255,255,255,0.12); backdrop-filter: blur(8px); opacity: 0; }
.visible .glass-particles span { animation: shatter 4.6s ease-out infinite; animation-delay: var(--d, 0s); }
.glass-particles span:nth-child(3n){--s:26px}.glass-particles span:nth-child(4n){--s:58px}.glass-particles span:nth-child(1){--x:-410px;--y:-280px;--d:.1s}.glass-particles span:nth-child(2){--x:-300px;--y:-370px;--d:.2s}.glass-particles span:nth-child(3){--x:-180px;--y:-310px;--d:.3s}.glass-particles span:nth-child(4){--x:-40px;--y:-390px;--d:.4s}.glass-particles span:nth-child(5){--x:110px;--y:-340px;--d:.5s}.glass-particles span:nth-child(6){--x:230px;--y:-295px;--d:.6s}.glass-particles span:nth-child(7){--x:365px;--y:-380px;--d:.7s}.glass-particles span:nth-child(8){--x:430px;--y:-250px;--d:.8s}.glass-particles span:nth-child(9){--x:-460px;--y:-120px;--d:.9s}.glass-particles span:nth-child(10){--x:-250px;--y:-160px;--d:1s}.glass-particles span:nth-child(11){--x:-90px;--y:-180px;--d:1.1s}.glass-particles span:nth-child(12){--x:70px;--y:-150px;--d:1.2s}.glass-particles span:nth-child(13){--x:250px;--y:-140px;--d:1.3s}.glass-particles span:nth-child(14){--x:420px;--y:-90px;--d:1.4s}.glass-particles span:nth-child(15){--x:-370px;--y:-430px;--d:1.5s}.glass-particles span:nth-child(16){--x:360px;--y:-430px;--d:1.6s}.glass-particles span:nth-child(n+17){--x:0px;--y:-500px;--d:1.7s}
@keyframes shatter { 0%{transform:translate(0,0) rotate(0deg) scale(.2);opacity:0} 16%{opacity:.82} 100%{transform:translate(var(--x), var(--y)) rotate(180deg) scale(.05);opacity:0} }

.global-floaters { position: fixed; inset: 0; pointer-events: none; z-index: 1; }
.floater { position: absolute; opacity: 0; will-change: transform; }
.floater.is-floating { opacity: 1; }
.glass-chip { border-radius: 20px; width: var(--size, 72px); height: var(--size, 72px); left: var(--left); top: var(--top); box-shadow: 0 10px 32px rgba(0,0,0,0.32), 0 0 26px var(--glow, rgba(0,229,255,0.13)), inset 0 1px 0 rgba(255,255,255,0.08); }
.chip-a{--left:7%;--top:12%;--size:88px;--glow:rgba(255,45,170,.16)}.chip-b{--left:83%;--top:18%;--size:58px}.chip-c{--left:15%;--top:73%;--size:116px;--glow:rgba(224,255,79,.12)}.chip-d{--left:76%;--top:68%;--size:94px;--glow:rgba(255,45,170,.14)}.chip-e{--left:55%;--top:82%;--size:62px}.chip-f{--left:91%;--top:44%;--size:52px;--glow:rgba(224,255,79,.15)}.chip-g{--left:3%;--top:46%;--size:50px}.chip-h{--left:31%;--top:9%;--size:70px;--glow:rgba(255,45,170,.13)}.chip-i{--left:68%;--top:7%;--size:84px}.chip-j{--left:21%;--top:39%;--size:44px;--glow:rgba(224,255,79,.12)}.chip-k{--left:47%;--top:55%;--size:66px;--glow:rgba(255,45,170,.12)}.chip-l{--left:88%;--top:84%;--size:74px}

.ambient-layer { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.background-gear { position: absolute; fill: none; stroke: #00e5ff; stroke-width: 3; opacity: 0.07; filter: drop-shadow(0 0 20px rgba(0,229,255,0.25)); }
.gear-one { width: 34vw; left: -7vw; top: 10vh; animation: lazyRotate 34s linear infinite; }
.gear-two { width: 26vw; right: -4vw; bottom: 5vh; stroke: #ff2daa; animation: lazyRotate 38s linear infinite reverse; }
@keyframes lazyRotate { to { transform: rotate(360deg); } }

.nav-pill { position: fixed; left: 50%; bottom: 2rem; width: 160px; height: 44px; transform: translateX(-50%); border-radius: 999px; display: flex; justify-content: center; align-items: center; gap: 0.65rem; z-index: 10; cursor: pointer; color: rgba(224,255,79,0.7); transition: transform 0.3s var(--spring), box-shadow 0.3s var(--spring); }
.nav-pill:hover { transform: translateX(-50%) translateY(-3px) scale(1.04); box-shadow: 0 8px 32px rgba(0,0,0,0.4), 0 0 28px rgba(224,255,79,0.23); }
.nav-pill.bounce { animation: pillBounce 0.52s var(--spring); }
@keyframes pillBounce { 50% { transform: translateX(-50%) translateY(4px) scale(0.94); } }
.section-counter { font-family: "JetBrains Mono", monospace; font-size: 0.9rem; }
.progress-arc { width: 36px; height: 36px; transform: rotate(-90deg); overflow: visible; }
.progress-arc circle { fill: none; stroke: rgba(255,255,255,0.2); stroke-width: 5; }
.progress-arc .progress-circle { stroke: #e0ff4f; stroke-linecap: round; stroke-dasharray: 251.2; stroke-dashoffset: 200.96; transition: stroke-dashoffset 0.45s ease; filter: drop-shadow(0 0 5px rgba(224,255,79,0.55)); }

@media (max-width: 900px) {
  body { overflow: auto; }
  .content-section { grid-template-columns: 1fr; height: auto; min-height: 100vh; align-content: center; }
  .hero-panel, .concept-primary, .concept-note, .step-one, .step-two, .step-three, .playground-panel, .closing-message { grid-column: 1; width: 100%; margin: 0; min-height: auto; }
  .hero-panel { height: 62vh; }
  .scribble-title text { font-size: 105px; }
  .orbit-map, .thread-viz, .engine-svg { position: relative; width: min(80vw, 420px); inset: auto; margin: 1rem auto; }
  .step-two, .step-three { margin-top: 0; }
  .playground-panel { width: 100%; }
  .interactive-zone { position: relative; left: auto; bottom: auto; transform: translateY(60px) scale(0.85); margin-top: 1rem; justify-self: center; }
  .visible .interactive-zone { animation-name: bounceEnter; }
  .glass-chip { transform: scale(0.65); }
}

@media (max-width: 560px) {
  .hero-panel { height: 54vh; }
  .scribble-title text { font-size: 78px; }
  .terminal-strip { font-size: 0.72rem; }
  .section-headline { font-size: clamp(2rem, 13vw, 3rem); }
  .process-node { width: 54px; height: 54px; }
  .nav-pill { bottom: 1rem; }
}