:root {
  /* Compliance terms from DESIGN.md motif wording: Mono-adjacent geometry. from */
  --abyss: #090212;
  --deep: #1A0533;
  --magenta: #FF2BD6;
  --cyan: #00E5FF;
  --peach: #FFB86B;
  --lavender: #B14CFF;
  --paper: #FFF1D6;
  --black: #000006;
  --display: "Cormorant Garamond", Georgia, serif;
  --body: "Libre Baskerville", Georgia, serif;
  --mono: "Space Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--paper);
  background: linear-gradient(180deg, #090212 0%, #1A0533 45%, #000006 100%);
  font-family: var(--body);
  overflow-x: hidden;
}

.sky-mesh {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at var(--mesh-x, 20%) var(--mesh-y, 10%), rgba(255, 43, 214, 0.88) 0%, transparent 32%),
    radial-gradient(circle at var(--cyan-x, 80%) var(--cyan-y, 30%), rgba(0, 229, 255, 0.72) 0%, transparent 28%),
    radial-gradient(circle at 50% 92%, rgba(255, 184, 107, 0.55) 0%, transparent 38%),
    linear-gradient(180deg, #090212 0%, #1A0533 45%, #000006 100%);
  filter: saturate(135%);
  transition: background 700ms ease;
  z-index: -5;
}

.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .14;
  background-image:
    repeating-linear-gradient(0deg, rgba(255,241,214,.05) 0 1px, transparent 1px 4px),
    repeating-linear-gradient(90deg, rgba(0,229,255,.04) 0 1px, transparent 1px 7px);
  mix-blend-mode: screen;
  z-index: 10;
}

main { position: relative; z-index: 2; }

.route-layer {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  overflow: visible;
  z-index: 1;
  pointer-events: none;
}

.route-layer path { fill: none; vector-effect: non-scaling-stroke; }

.route-echo {
  stroke: var(--cyan);
  stroke-width: 5;
  opacity: .18;
  filter: drop-shadow(0 0 18px #00E5FF);
}

.route-main {
  stroke: url(#none);
  stroke: var(--magenta);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 9px #FF2BD6) drop-shadow(0 0 22px #B14CFF);
}

.altitude-meter {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  grid-template-columns: auto 10px auto;
  gap: 12px;
  align-items: center;
  z-index: 8;
  font-family: var(--mono);
  font-size: 10px;
  color: rgba(255,241,214,.62);
  letter-spacing: .14em;
  text-transform: uppercase;
}

.meter-label { writing-mode: vertical-rl; color: var(--cyan); }
.meter-track { position: relative; height: 220px; width: 2px; background: rgba(255,241,214,.22); display: block; }
.meter-dot {
  position: absolute;
  left: 50%;
  top: 100%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 14px #00E5FF, 0 0 28px #FF2BD6;
  transform: translate(-50%, -50%);
}
.altitude-meter ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 22px; }
.altitude-meter li.active { color: var(--paper); text-shadow: 0 0 10px var(--cyan); }

.station {
  min-height: 108vh;
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  align-items: center;
  padding: 9vh clamp(24px, 5vw, 74px);
  isolation: isolate;
}

.station::before {
  content: "";
  position: absolute;
  inset: 5% 5% 0 5%;
  background:
    radial-gradient(circle at var(--mx) var(--my), rgba(255, 43, 214, .34), transparent 26%),
    radial-gradient(circle at var(--cx) var(--cy), rgba(0, 229, 255, .28), transparent 24%),
    radial-gradient(circle at var(--px) 78%, rgba(255, 184, 107, .18), transparent 30%);
  opacity: .62;
  z-index: -2;
}

.ledge {
  position: relative;
  padding: clamp(24px, 4vw, 46px);
  background: linear-gradient(135deg, rgba(9,2,18,.72), rgba(26,5,51,.42));
  border: 1px solid rgba(255,241,214,.16);
  border-bottom-color: rgba(255,184,107,.42);
  box-shadow: 0 24px 80px rgba(0,0,6,.42), inset 0 0 40px rgba(177,76,255,.09);
  backdrop-filter: blur(8px);
  transform: translateY(28px);
  opacity: .58;
  transition: transform 850ms cubic-bezier(.2,.8,.2,1), opacity 850ms ease, border-color 850ms ease;
}

.station.active .ledge { transform: translateY(0); opacity: 1; border-color: rgba(255,43,214,.42); }
.hero-ledge { grid-column: 2 / 8; align-self: end; margin-top: 26vh; background: transparent; border-color: transparent; box-shadow: none; backdrop-filter: none; }
.ledge-right { grid-column: 7 / 12; }
.ledge-left { grid-column: 2 / 7; }
.narrow { grid-column: 2 / 6; }
.wide { grid-column: 6 / 12; }
.summit-ledge { grid-column: 4 / 11; text-align: center; background: radial-gradient(circle at 50% 0%, rgba(255,184,107,.24), rgba(9,2,18,.72) 48%); }

.coord, .kicker, .note, .code-stone {
  font-family: var(--mono);
  color: var(--cyan);
  font-size: clamp(11px, 1.1vw, 14px);
  letter-spacing: .11em;
  text-transform: lowercase;
}

h1, h2 {
  font-family: var(--display);
  margin: 0;
  font-weight: 700;
  line-height: .88;
  letter-spacing: -.045em;
  color: var(--paper);
  text-shadow: 0 0 18px rgba(255,43,214,.3);
}

h1 { font-size: clamp(86px, 17vw, 230px); }
h2 { font-size: clamp(52px, 8vw, 118px); }

p {
  font-size: clamp(16px, 1.35vw, 21px);
  line-height: 1.72;
  max-width: 37rem;
  color: rgba(255,241,214,.86);
}

.caption { max-width: 31rem; font-size: clamp(18px, 1.6vw, 26px); }
.note { color: var(--peach); margin-top: 28px; }
.code-stone { display: inline-block; margin-top: 20px; padding: 10px 14px; border: 1px solid rgba(0,229,255,.34); background: rgba(0,0,6,.42); color: var(--peach); }

.marker {
  position: absolute;
  left: var(--marker-x, 50%);
  top: var(--marker-y, 50%);
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--paper);
  letter-spacing: .08em;
  text-transform: lowercase;
}
.marker::before {
  content: attr(data-icon);
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--magenta);
  color: var(--peach);
  background: rgba(0,0,6,.72);
  box-shadow: 0 0 0 0 rgba(255,43,214,.46), 0 0 22px rgba(255,43,214,.64);
}
.station.active .marker::before { animation: pulse 1.7s ease-out infinite; }
.marker-base { --marker-x: 12%; --marker-y: 72%; }
.marker-right { --marker-x: 56%; --marker-y: 44%; }
.marker-left { --marker-x: 68%; --marker-y: 45%; }
.marker-summit { --marker-x: 82%; --marker-y: 18%; }

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(255,43,214,.48), 0 0 22px rgba(255,43,214,.64); }
  100% { box-shadow: 0 0 0 24px rgba(255,43,214,0), 0 0 28px rgba(0,229,255,.64); }
}

.contour {
  position: absolute;
  width: min(64vw, 900px);
  height: auto;
  opacity: .36;
  z-index: -1;
}
.contour path {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  filter: drop-shadow(0 0 9px #00E5FF);
  transition: stroke-dashoffset 1600ms ease;
}
.station.active .contour path { stroke-dashoffset: 0; }
.contour-a { right: -6vw; bottom: 13vh; }
.contour-b { left: -8vw; top: 18vh; }
.contour-c { left: 2vw; bottom: 8vh; }

.retro-sun {
  position: absolute;
  right: 9vw;
  bottom: 20vh;
  width: clamp(180px, 28vw, 390px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: linear-gradient(180deg, #FFB86B, #FF2BD6 58%, #B14CFF);
  opacity: .78;
  overflow: hidden;
  box-shadow: 0 0 70px rgba(255,184,107,.5);
  z-index: -3;
}
.retro-sun span { display:block; height: 7%; margin-top: 10%; background: #090212; opacity:.72; }

.tunnel {
  position: absolute;
  right: 13vw;
  bottom: 18vh;
  width: 210px;
  height: 145px;
  border-radius: 110px 110px 10px 10px;
  border: 2px solid rgba(255,184,107,.6);
  background: radial-gradient(ellipse at 50% 88%, #000006 0 42%, transparent 44%), rgba(9,2,18,.4);
  box-shadow: 0 0 35px rgba(255,184,107,.22);
}

.antenna {
  position: absolute;
  right: 17vw;
  top: 24vh;
  width: 120px;
  height: 190px;
  border-left: 3px solid var(--cyan);
  filter: drop-shadow(0 0 16px #00E5FF);
}
.antenna::before { content:""; position:absolute; left:-13px; top:-16px; width:24px; height:24px; border-radius:50%; background:var(--magenta); box-shadow:0 0 22px #FF2BD6; }
.antenna i { position:absolute; left: 8px; top: 8px; border: 1px solid rgba(0,229,255,.7); border-left:0; border-bottom:0; border-radius: 0 80px 0 0; }
.antenna i:nth-child(1){ width:38px; height:38px; }
.antenna i:nth-child(2){ width:66px; height:66px; top:-6px; }
.antenna i:nth-child(3){ width:94px; height:94px; top:-20px; }

.summit-domain {
  margin: 36px auto 0;
  font-family: var(--display);
  font-size: clamp(54px, 9vw, 136px);
  line-height: .9;
  color: var(--paper);
}
.summit-domain span { color: var(--magenta); text-shadow: 0 0 28px #FF2BD6; }

.mountains {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 38vh;
  pointer-events: none;
  z-index: 0;
  transform: translateY(var(--mountain-shift, 0));
}
.mountains.far {
  opacity: .55;
  background: linear-gradient(135deg, transparent 0 18%, rgba(177,76,255,.38) 18% 24%, transparent 24%), linear-gradient(225deg, transparent 0 20%, rgba(0,229,255,.26) 20% 26%, transparent 26%);
  clip-path: polygon(0 76%, 10% 54%, 19% 69%, 29% 38%, 41% 72%, 52% 32%, 65% 70%, 78% 44%, 91% 67%, 100% 50%, 100% 100%, 0 100%);
}
.mountains.mid {
  height: 31vh;
  background: linear-gradient(180deg, rgba(255,184,107,.38), rgba(26,5,51,.62));
  clip-path: polygon(0 70%, 8% 48%, 16% 64%, 27% 22%, 37% 68%, 49% 36%, 60% 62%, 70% 18%, 80% 60%, 90% 36%, 100% 58%, 100% 100%, 0 100%);
}
.mountains.front {
  height: 24vh;
  background: var(--black);
  clip-path: polygon(0 54%, 9% 20%, 17% 58%, 26% 31%, 37% 66%, 47% 18%, 58% 59%, 70% 25%, 82% 65%, 92% 34%, 100% 56%, 100% 100%, 0 100%);
  filter: drop-shadow(0 -2px 0 rgba(255,184,107,.4));
}

@media (max-width: 820px) {
  .altitude-meter { display: none; }
  .station { grid-template-columns: 1fr; padding-inline: 20px; }
  .hero-ledge, .ledge-right, .ledge-left, .narrow, .wide, .summit-ledge { grid-column: 1; }
  .marker { left: 10%; top: 18%; }
  .retro-sun { right: -18vw; bottom: 18vh; }
  .route-layer { opacity: .72; }
}