:root {
  --yellow: #fff555;
  --ink: #ffffff;
  --muted: rgba(255, 255, 255, 0.76);
  --faint: rgba(255, 255, 255, 0.5);
  --line: rgba(255, 255, 255, 0.16);
  --glass: rgba(4, 10, 22, 0.38);
  --gutter: clamp(20px, 4vw, 56px);
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", "Helvetica Neue", Arial, sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: #000;
  color: var(--ink);
  overscroll-behavior: none;
  scroll-behavior: auto; /* Lenis owns smoothing */
}
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-stopped { overflow: hidden; }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

#webgl {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}
#scroll { position: relative; height: 1600vh; }

/* ── loader ─────────────────────────────────────────────────────────── */
.loader {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 18px;
  background: #000;
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: opacity 700ms var(--ease-out), visibility 700ms;
}
.loader-mark { width: 56px; color: #fff; animation: breathe 1.6s ease-in-out infinite alternate; }
html.ready .loader { opacity: 0; visibility: hidden; }
@keyframes breathe { from { opacity: 0.45; } to { opacity: 1; } }

/* ── nav ─────────────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  z-index: 10;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: 40px;
  padding: calc(env(safe-area-inset-top, 0px) + 22px) var(--gutter) 22px;
  pointer-events: none;
}
.nav > * { pointer-events: auto; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-stretch: 118%; letter-spacing: 0.08em; font-size: 18px; }
.brand svg { width: 30px; height: auto; }
.nav-links { display: flex; gap: 28px; margin-left: auto; }
.nav-links a {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 160ms ease;
}
.nav-links a[aria-current] { color: var(--ink); }
@media (hover: hover) and (pointer: fine) { .nav-links a:hover { color: var(--yellow); } }
.concept-chip {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--yellow);
  border: 1px solid rgba(255, 245, 85, 0.5);
  border-radius: 999px;
  padding: 5px 11px;
}

/* ── HUD ─────────────────────────────────────────────────────────────── */
.hud {
  position: fixed;
  z-index: 10;
  left: var(--gutter);
  right: var(--gutter);
  bottom: calc(env(safe-area-inset-bottom, 0px) + 22px);
  display: flex;
  align-items: baseline;
  gap: 28px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
  pointer-events: none;
}
.hud-row { display: flex; gap: 10px; }
.hud-v { color: var(--ink); font-variant-numeric: tabular-nums; letter-spacing: 0.06em; }
.hud-chapter { margin-left: auto; color: var(--muted); }
.hud-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -10px;
  height: 1px;
  background: var(--line);
  overflow: hidden;
}
.hud-progress i { position: absolute; inset: 0; background: var(--yellow); transform-origin: 0 50%; transform: scaleX(0); }

/* ── chapter rail ───────────────────────────────────────────────────────
   At rest only the current chapter shows. Hovering the rail reveals every number;
   hovering a number reveals its name. Numbers sit in one fixed, right-aligned column. */
.rail {
  position: fixed;
  z-index: 10;
  right: calc(var(--gutter) - 8px);
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  justify-items: end;
  gap: 2px;
  padding-left: 140px; /* hover target wide enough to reach the labels */
}
.rail-item {
  position: relative;
  display: block;
  padding: 5px 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  opacity: 0;
  transition: opacity 200ms var(--ease-out), color 160ms ease, transform 160ms var(--ease-out);
}
.rail-item:active { transform: scale(0.97); }
.rail-num { display: block; width: 2.4ch; text-align: right; font-variant-numeric: tabular-nums; }
.rail-label {
  position: absolute;
  right: calc(100% - 2px);
  top: 50%;
  white-space: nowrap;
  opacity: 0;
  transform: translate(6px, -50%);
  transition: opacity 200ms var(--ease-out), transform 200ms var(--ease-out);
  pointer-events: none;
}
.rail-item[aria-current] { opacity: 1; color: var(--yellow); }
.rail-item[aria-current] .rail-label { opacity: 1; transform: translate(0, -50%); }
.rail:focus-within .rail-item { opacity: 1; }
.rail-item:focus-visible { outline: 1px solid var(--yellow); outline-offset: 2px; border-radius: 6px; }
.rail-item:focus-visible .rail-label { opacity: 1; transform: translate(0, -50%); }
@media (hover: hover) and (pointer: fine) {
  .rail:hover .rail-item { opacity: 1; }
  .rail-item:hover { color: var(--ink); }
  .rail-item:hover .rail-label { opacity: 1; transform: translate(0, -50%); }
  /* while browsing the list, only the hovered item names itself */
  .rail:hover .rail-item[aria-current]:not(:hover) .rail-label { opacity: 0; }
}

/* ── side scrim: a dark wash from the left edge behind left-aligned copy over bright sky ── */
.side-scrim {
  position: fixed;
  inset: 0 auto 0 0;
  width: min(760px, 70vw);
  z-index: 3;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(to right, rgba(2, 8, 22, 0.6), rgba(2, 8, 22, 0.32) 45%, transparent);
  will-change: opacity;
}

/* ── hero scrim: lifts the white hero copy off the bright cloud deck ── */
.hero-scrim {
  position: fixed;
  inset: auto 0 0 0;
  height: 62vh;
  z-index: 3;
  pointer-events: none;
  background: linear-gradient(to top, rgba(2, 8, 22, 0.55), rgba(2, 8, 22, 0.28) 45%, transparent);
  will-change: opacity;
}

/* ── scroll cue ─────────────────────────────────────────────────────── */
.scroll-cue {
  position: fixed;
  z-index: 5;
  left: 50%;
  bottom: 70px;
  transform: translateX(-50%);
  display: grid;
  justify-items: center;
  gap: 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  pointer-events: none;
}
.scroll-cue i { width: 1px; height: 44px; background: linear-gradient(var(--ink), transparent); transform-origin: top; animation: cue 2.2s var(--ease-out) infinite; }
@keyframes cue { 0% { transform: scaleY(0); opacity: 1; } 70% { transform: scaleY(1); opacity: 1; } 100% { transform: scaleY(1); opacity: 0; } }

/* ── captions ───────────────────────────────────────────────────────── */
.cap {
  position: fixed;
  z-index: 4;
  opacity: 0;
  will-change: opacity, transform;
  pointer-events: none;
  text-shadow: 0 1px 30px rgba(0, 12, 34, 0.35);
}
.cap.on { pointer-events: auto; }
.cap::before {
  content: "";
  position: absolute;
  inset: -90px -140px;
  z-index: -1;
  background: radial-gradient(closest-side, rgba(2, 8, 22, 0.42), transparent);
  pointer-events: none;
}

.cap--hero { left: var(--gutter); bottom: 15vh; max-width: min(760px, 92vw); }
.cap--left { left: var(--gutter); bottom: 15vh; max-width: 460px; }
.cap--right { right: calc(var(--gutter) + 72px); bottom: 15vh; max-width: 460px; }
.cap--numbers { right: calc(var(--gutter) + 72px); bottom: 12vh; width: min(600px, 92vw); }
.cap--final { left: var(--gutter); bottom: 12vh; max-width: 560px; }

.eyebrow {
  color: var(--yellow);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.display {
  font-size: clamp(44px, 13vw, 196px);
  font-weight: 700;
  font-stretch: 122%;
  letter-spacing: -0.02em;
  line-height: 0.86;
  margin-left: -0.04em;
}
.lede { margin-top: 22px; max-width: 30ch; font-size: clamp(17px, 1.6vw, 21px); color: var(--muted); line-height: 1.45; }
.title {
  font-size: clamp(30px, 3.4vw, 48px);
  font-weight: 700;
  font-stretch: 112%;
  letter-spacing: -0.015em;
  line-height: 1.04;
  text-wrap: balance;
}
.body { margin-top: 16px; color: var(--muted); font-size: 16px; max-width: 44ch; text-wrap: pretty; }
.hint { margin-top: 18px; font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--faint); }
.hint-touch { display: none; }
@media (hover: none) { .hint-fine { display: none; } .hint-touch { display: inline; } }

/* Stat tiles — one component for every spec grid (By the Numbers, Symphony).
   Frosted rounded tiles set in Inter; `.stats--2` is the two-column variant. */
.cap--numbers { font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif; }
.cap--numbers .title { margin-bottom: 22px; letter-spacing: -0.025em; }
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}
.stats--2 { grid-template-columns: repeat(2, 1fr); margin-top: 22px; }
.stats--2 .stat dd { font-size: clamp(20px, 2vw, 28px); white-space: nowrap; }
.stat {
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-end;
  padding: 18px 20px 16px;
  border-radius: 22px;
  background: rgba(10, 16, 30, 0.42);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(18px) saturate(1.3);
  -webkit-backdrop-filter: blur(18px) saturate(1.3);
}
.stats--numbers .stat:first-child, .stats--numbers .stat:last-child { grid-column: span 2; }
.stat dt { order: 2; margin-top: 6px; font-size: 11px; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); }
.stat dd {
  display: flex;
  align-items: baseline;
  gap: 3px;
  color: var(--yellow);
  font-size: clamp(24px, 2.4vw, 34px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.stat .unit { font-size: 0.72em; }
[data-odo] { display: inline-flex; }
.odo-col { display: inline-block; height: 1em; overflow: hidden; }
.odo-strip {
  display: block;
  width: 1ch;
  word-break: break-all;
  line-height: 1em;
  text-align: center;
  transform: translateY(0);
  transition: transform 1100ms var(--ease-out) calc(var(--i) * 60ms);
}
.rolled .odo-strip { transform: translateY(calc(var(--d) * -1em)); }


.mach-live {
  font-size: clamp(64px, 9vw, 132px);
  font-weight: 700;
  font-stretch: 118%;
  line-height: 0.9;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.mach-live .unit { font-size: 0.34em; letter-spacing: 0.04em; color: var(--ink); vertical-align: 0.9em; }
.mach-mu { margin-top: 14px; font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); }
.mach-mu b { color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }
.mu-sym { text-transform: none; } /* uppercase would turn μ into a capital Greek M */

.airlines { list-style: none; display: flex; flex-wrap: wrap; gap: 10px 26px; margin-top: 22px; }
.airlines li { font-size: 13px; font-weight: 700; font-stretch: 115%; letter-spacing: 0.16em; text-transform: uppercase; }
.ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-flex;
  align-items: center;
  height: 46px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  font-size: 14px;
  font-weight: 600;
  transition: transform 160ms var(--ease-out), background-color 160ms ease, border-color 160ms ease;
}
.btn:active { transform: scale(0.97); }
.btn--primary { background: var(--yellow); color: #000; border-color: var(--yellow); }
.btn:focus-visible { outline: 2px solid var(--yellow); outline-offset: 3px; }
@media (hover: hover) and (pointer: fine) {
  .btn:hover { border-color: #fff; }
  .btn--primary:hover { background: #fffa9e; }
}
.credit { margin-top: 26px; font-size: 12px; color: var(--faint); max-width: 48ch; }

/* ── 3D-anchored labels ─────────────────────────────────────────────── */
.labels { position: fixed; inset: 0; z-index: 3; pointer-events: none; }
.tag {
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: -5px 0 0 -5px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  visibility: hidden;
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.6);
}
.tag i { width: 10px; height: 10px; border-radius: 50%; border: 1px solid var(--yellow); background: rgba(255, 245, 85, 0.25); flex: none; }
.tag--ground { color: var(--yellow); }

.hotspot {
  position: absolute;
  top: 0;
  left: 0;
  margin: -14px 0 0 -14px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  visibility: hidden;
  pointer-events: auto;
}
.hotspot-dot { width: 12px; height: 12px; border-radius: 50%; background: var(--yellow); box-shadow: 0 0 0 0 rgba(255, 245, 85, 0.5); animation: ping 2.4s var(--ease-out) infinite; transition: transform 160ms var(--ease-out); }
.hotspot:active .hotspot-dot { transform: scale(0.9); }
@keyframes ping { 0% { box-shadow: 0 0 0 0 rgba(255, 245, 85, 0.55); } 70%, 100% { box-shadow: 0 0 0 14px rgba(255, 245, 85, 0); } }
.hotspot-card {
  position: absolute;
  left: 26px;
  top: 50%;
  width: 230px;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(12, 14, 20, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.45;
  color: var(--muted);
  text-align: left;
  opacity: 0;
  transform: translateY(-50%) scale(0.96);
  transform-origin: 0 50%;
  transition: opacity 180ms var(--ease-out), transform 180ms var(--ease-out);
  pointer-events: none;
}
.hotspot-card b { display: block; color: var(--ink); font-size: 13px; margin-bottom: 2px; }
.hotspot:focus-visible { outline: none; }
.hotspot:focus-visible .hotspot-dot { outline: 2px solid #fff; outline-offset: 3px; }
.hotspot:focus-visible .hotspot-card { opacity: 1; transform: translateY(-50%) scale(1); }
@media (hover: hover) and (pointer: fine) {
  .hotspot:hover .hotspot-card { opacity: 1; transform: translateY(-50%) scale(1); }
}

.noscript { position: fixed; inset: 0; display: grid; place-items: center; color: var(--muted); }

/* ── small screens ──────────────────────────────────────────────────── */
@media (max-width: 760px) {
  .nav-links, .rail, .scroll-cue { display: none; }
  .concept-chip { margin-left: auto; }
  .display { font-size: 12.8vw; }
  .cap--hero, .cap--left, .cap--right, .cap--final, .cap--numbers {
    left: var(--gutter);
    right: var(--gutter);
    bottom: calc(env(safe-area-inset-bottom, 0px) + 72px);
    max-width: none;
    width: auto;
  }
  .cap::before { inset: -120px -60px -80px; background: linear-gradient(transparent, rgba(2, 8, 22, 0.6) 40%); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat { padding: 12px 14px; border-radius: 18px; }
  .stats--numbers .stat:first-child { grid-column: span 2; }
  .stats--numbers .stat:last-child { grid-column: auto; }
  .hud-chapter { display: none; }
  .hotspot-card { width: 190px; }
}

@media (prefers-reduced-motion: reduce) {
  .loader-mark, .scroll-cue i, .hotspot-dot { animation: none; }
  .odo-strip { transition-duration: 1ms; }
}