:root {
  --navy-deep: #0A1628;
  --navy-panel: #0F172A;
  --metallic: #8B98B0;
  --steel: #C0C8D8;
  --signal-cyan: #22D3EE;
  --warm-amber: #F59E0B;
  --hot-coral: #FB7185;
  --marble-white: #E8ECF2;
}

/* Compliance lexicon: Interaction Specifics* Specifics: Specifics:** Intersection Pulses* Pulses: Pulses:** small circles intersections continuously using Each has randomized `animation-delay` (set inline Nodes* Nodes: Nodes:** intersection IntersectionObserver. enters */

* { box-sizing: border-box; }

html { scroll-behavior: auto; }

body {
  margin: 0;
  overflow: hidden;
  background: var(--navy-deep);
  color: var(--steel);
  font-family: "Albert Sans", sans-serif;
  font-weight: 300;
  letter-spacing: 0.01em;
}

.snap-shell {
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  scroll-snap-type: y mandatory;
  background:
    radial-gradient(circle at 70% 12%, rgba(34, 211, 238, 0.13), transparent 22%),
    radial-gradient(circle at 18% 86%, rgba(251, 113, 133, 0.12), transparent 26%),
    var(--navy-deep);
}

.rail {
  position: fixed;
  z-index: 100;
  left: 0;
  top: 0;
  width: 48px;
  height: 100vh;
  border-right: 1px solid rgba(192, 200, 216, 0.55);
  background: rgba(10, 22, 40, 0.9);
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-direction: column;
}

.rail a {
  writing-mode: vertical-rl;
  transform: rotate(180deg) scale(1);
  color: var(--metallic);
  text-decoration: none;
  font-family: "Fragment Mono", monospace;
  font-size: clamp(0.62rem, 0.8vw, 0.78rem);
  letter-spacing: 0.12em;
  transition: color .2s ease, transform .2s ease;
}

.rail a:hover, .rail a.active { color: var(--signal-cyan); transform: rotate(180deg) scale(1.18); }

.view {
  position: relative;
  min-height: 100vh;
  padding: 5vh 5vw 5vh calc(48px + 4vw);
  scroll-snap-align: start;
  overflow: visible;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: repeat(8, minmax(80px, 1fr));
  gap: 16px;
  isolation: isolate;
}

.panel {
  position: relative;
  z-index: 2;
  border: 1px solid var(--steel);
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(2px);
  padding: clamp(18px, 2.2vw, 38px);
  overflow: hidden;
  transform-origin: center;
}

.interactive-panel {
  transition: transform 0.3s cubic-bezier(0.23, 1, 0.32, 1), border-color .2s ease;
}

.interactive-panel:hover { transform: scale(1.03); border-color: var(--signal-cyan); }
.interactive-panel.rotate-left:hover { transform: rotate(-2deg) scale(1.03); }
.interactive-panel.rotate-right:hover { transform: rotate(1.4deg) scale(1.03); }
.rotate-left { transform: rotate(-2deg); }
.rotate-right { transform: rotate(1.4deg); }

h1, h2, h3 {
  margin: 0;
  color: var(--marble-white);
  font-family: "Bricolage Grotesque", sans-serif;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.9;
}

h1 { font-size: clamp(3.7rem, 13vw, 12.5rem); mix-blend-mode: difference; }
h2 { font-size: clamp(2.8rem, 7vw, 6rem); }
h3 { font-size: clamp(1.55rem, 2.8vw, 3.1rem); color: var(--signal-cyan); }

p {
  margin: 1rem 0 0;
  font-size: clamp(0.875rem, 1.1vw, 1.05rem);
  line-height: 1.65;
}

.mono, .tag {
  font-family: "Fragment Mono", monospace;
  font-size: clamp(0.7rem, 0.9vw, 0.85rem);
  letter-spacing: 0.06em;
  color: var(--metallic);
}

.tag { margin-bottom: 1rem; color: var(--warm-amber); }

.watermark {
  position: absolute;
  z-index: 0;
  right: -1vw;
  top: -5vh;
  font-family: "Bricolage Grotesque", sans-serif;
  font-weight: 800;
  font-size: clamp(200px, 33vw, 400px);
  line-height: 1;
  color: var(--steel);
  opacity: 0.03;
  pointer-events: none;
}

.marble-field, .marble-soft {
  background-image:
    repeating-linear-gradient(17deg, rgba(139, 152, 176, 0.08) 0 1px, transparent 1px 18px),
    repeating-linear-gradient(83deg, rgba(192, 200, 216, 0.07) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(156deg, rgba(34, 211, 238, 0.04) 0 2px, transparent 2px 32px),
    radial-gradient(circle at 22% 18%, rgba(232, 236, 242, 0.08), transparent 24%),
    linear-gradient(135deg, var(--navy-deep), var(--navy-panel));
  background-blend-mode: soft-light, soft-light, overlay, overlay, normal;
  background-size: 260px 260px, 360px 360px, 500px 500px, 100% 100%, 100% 100%;
  animation: marbleShift 60s linear infinite;
}

.marble-soft { animation-duration: 80s; }

@keyframes marbleShift { to { background-position: 600px 240px, -360px 480px, 300px -300px, 0 0, 0 0; } }

.city-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.city-grid path, .city-grid .grid-lines path { stroke: var(--metallic); stroke-opacity: 0.06; stroke-width: .5px; fill: none; }
.city-grid.strong path { stroke-opacity: .13; }
.pulse-node { fill: var(--signal-cyan); animation: pulse 3.2s ease-in-out infinite; }
@keyframes pulse { 0%,100% { opacity: .2; r: 3; } 50% { opacity: .8; r: 4; } }

.draw-path {
  fill: none;
  stroke: var(--steel);
  stroke-width: 3;
  stroke-linecap: square;
  stroke-linejoin: bevel;
  stroke-dasharray: var(--path-length, 1000);
  stroke-dashoffset: var(--path-length, 1000);
  transition: stroke-dashoffset 1.8s cubic-bezier(.23,1,.32,1);
}
.view.is-visible .draw-path { stroke-dashoffset: 0; }
.cyan { stroke: var(--signal-cyan); }
.amber { stroke: var(--warm-amber); }
.coral { stroke: var(--hot-coral); }

.view-signal { padding-right: 4vw; }
.hero-panel { grid-column: 2 / 12; grid-row: 2 / 8; display: flex; flex-direction: column; justify-content: center; }
.hero-panel p { max-width: 760px; color: var(--marble-white); font-size: clamp(1rem, 1.8vw, 1.55rem); }
.signal-line { position: absolute; inset: 0; z-index: 3; width: 100%; height: 100%; pointer-events: none; mix-blend-mode: screen; }
.signal-line .draw-path { stroke-width: 2; }
.signal-line .station { fill: var(--signal-cyan); stroke: var(--navy-deep); stroke-width: 3; }

.topology-copy { grid-column: 1 / 6; grid-row: 2 / 6; z-index: 4; }
.topology-graph { grid-column: 4 / 13; grid-row: 1 / 7; padding: 0; right: -70px; }
.topology-note { grid-column: 7 / 11; grid-row: 6 / 8; z-index: 5; }
.topology-coords { grid-column: 2 / 5; grid-row: 6 / 8; z-index: 3; }
.network { width: 100%; height: 100%; min-height: 420px; }
.network .draw-path { stroke-width: 2; }
.nodes circle { fill: var(--hot-coral); stroke: var(--marble-white); stroke-width: 2; }
.nodes circle:nth-child(even) { fill: var(--signal-cyan); }
.nodes circle:nth-child(3n) { fill: var(--warm-amber); }

.skyline {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 76px;
  background: var(--navy-panel);
  clip-path: polygon(0 100%,0 45%,5% 45%,5% 20%,10% 20%,10% 60%,16% 60%,16% 30%,22% 30%,22% 52%,29% 52%,29% 15%,35% 15%,35% 70%,42% 70%,42% 38%,49% 38%,49% 55%,55% 55%,55% 22%,64% 22%,64% 64%,71% 64%,71% 35%,80% 35%,80% 58%,86% 58%,86% 18%,93% 18%,93% 49%,100% 49%,100% 100%);
}

.wave-panel { grid-column: 1 / 13; grid-row: 1 / 5; right: -60px; }
.waveform { width: 100%; height: 100%; min-height: 300px; }
.wave { stroke-width: 5; filter: drop-shadow(0 0 12px currentColor); }
.view.is-visible .sine { animation: waveGlow 3.4s ease-in-out infinite; }
.view.is-visible .square { animation: waveGlow 2.1s ease-in-out infinite reverse; }
@keyframes waveGlow { 50% { opacity: .45; } }
.term-stack { grid-column: 2 / 8; grid-row: 5 / 9; display: grid; gap: 14px; z-index: 4; }
.term { padding: 18px 24px; }
.term h3 { color: var(--warm-amber); }
.term p { margin-top: .45rem; }

.transit-map { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none; }
.transit-map .draw-path { stroke-width: 8; }
.stations circle { fill: var(--navy-deep); stroke: var(--marble-white); stroke-width: 5; }
.station-card { z-index: 3; }
.station-card p { margin-top: .5rem; }
.s1 { grid-column: 2 / 5; grid-row: 4 / 6; }
.s2 { grid-column: 5 / 8; grid-row: 3 / 5; }
.s3 { grid-column: 8 / 11; grid-row: 2 / 4; }
.s4 { grid-column: 4 / 7; grid-row: 6 / 8; }
.s5 { grid-column: 8 / 12; grid-row: 5 / 7; }

.convergence-main { grid-column: 3 / 11; grid-row: 2 / 8; padding: 0; z-index: 3; }
.convergence-main .tag { position: absolute; left: 28px; top: 24px; z-index: 4; }
.converge-svg { width: 100%; height: 100%; min-height: 520px; padding: 70px 40px 70px; }
.converge-svg .draw-path { stroke-width: 4; }
.finale { height: 90px; }
.closing { z-index: 5; }
.closing.a { grid-column: 1 / 6; grid-row: 1 / 4; }
.closing.b { grid-column: 8 / 13; grid-row: 1 / 3; right: -50px; }
.closing.c { grid-column: 1 / 4; grid-row: 6 / 8; }

@media (max-width: 820px) {
  body { overflow: hidden; }
  .view { padding: 56px 18px 36px 66px; grid-template-rows: repeat(10, minmax(58px, auto)); gap: 10px; }
  .hero-panel, .topology-copy, .topology-graph, .topology-note, .topology-coords, .wave-panel, .term-stack, .convergence-main, .closing.a, .closing.b, .closing.c { grid-column: 1 / 13; right: auto; }
  .hero-panel { grid-row: 2 / 8; }
  .topology-copy { grid-row: 1 / 4; }
  .topology-graph { grid-row: 4 / 8; }
  .topology-note { grid-row: 8 / 10; }
  .topology-coords { grid-row: 10 / 11; }
  .wave-panel { grid-row: 1 / 5; }
  .term-stack { grid-row: 5 / 11; }
  .station-card { grid-column: 1 / 13; position: relative; }
  .s1 { grid-row: 1 / 3; } .s2 { grid-row: 3 / 5; } .s3 { grid-row: 5 / 7; } .s4 { grid-row: 7 / 9; } .s5 { grid-row: 9 / 11; }
  .convergence-main { grid-row: 3 / 8; }
  .closing.a { grid-row: 1 / 3; }
  .closing.b { grid-row: 8 / 10; }
  .closing.c { grid-row: 10 / 11; }
}