:root {
  --ink: #050706;
  --ink-soft: #0b1211;
  --bone: #edf1e9;
  --bone-dim: #a8b0a6;
  --signal: #58f2e4;
  --copper: #ca7b4a;
  --coral: #f04f3d;
  --line: rgba(237, 241, 233, 0.2);
  --mono: "IBM Plex Mono", "Courier New", monospace;
  --display: "Bodoni Moda", Georgia, serif;
  --gutter: clamp(1rem, 3vw, 3.75rem);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--ink);
  color: var(--bone);
  scroll-behavior: smooth;
  scrollbar-color: var(--copper) var(--ink);
}

body {
  margin: 0;
  overflow-x: clip;
  background: var(--ink);
  color: var(--bone);
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.6;
}

button,
input {
  font: inherit;
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

::selection {
  background: var(--signal);
  color: var(--ink);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bone);
  color: var(--ink);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  z-index: 20;
  inset: 0 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 4.5rem;
  padding: 0 var(--gutter);
  border-bottom: 1px solid transparent;
  transition: background-color 300ms ease, border-color 300ms ease;
}

.site-header.is-scrolled {
  border-color: rgba(237, 241, 233, 0.12);
  background: rgba(5, 7, 6, 0.84);
  backdrop-filter: blur(18px);
}

.wordmark {
  display: inline-flex;
  gap: 0.75rem;
  align-items: center;
  width: max-content;
  color: var(--bone);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-decoration: none;
}

.wordmark-mark {
  width: 1.1rem;
  aspect-ratio: 1;
  border: 1px solid var(--signal);
  border-radius: 50%;
  box-shadow: 0 0 0 0.3rem rgba(88, 242, 228, 0.08);
}

.header-status {
  margin: 0;
  color: var(--bone-dim);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.header-status span {
  display: inline-block;
  width: 0.42rem;
  aspect-ratio: 1;
  margin-right: 0.55rem;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0.8rem var(--signal);
  animation: statusPulse 2.4s ease-in-out infinite;
}

.sound-toggle {
  display: inline-flex;
  justify-self: end;
  gap: 0.7rem;
  align-items: center;
  border: 0;
  padding: 0.8rem 0;
  background: transparent;
  color: var(--bone-dim);
  cursor: pointer;
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.sound-toggle-bars {
  display: flex;
  gap: 2px;
  align-items: center;
  height: 0.9rem;
}

.sound-toggle-bars i {
  display: block;
  width: 2px;
  height: 35%;
  background: currentColor;
  transition: height 180ms ease;
}

.sound-toggle[aria-pressed="true"] .sound-toggle-bars i {
  animation: soundBar 720ms ease-in-out infinite alternate;
}

.sound-toggle[aria-pressed="true"] .sound-toggle-bars i:nth-child(2) {
  animation-delay: -420ms;
}

.sound-toggle[aria-pressed="true"] .sound-toggle-bars i:nth-child(3) {
  animation-delay: -180ms;
}

.hero {
  position: relative;
  display: flex;
  min-height: 100svh;
  overflow: hidden;
  align-items: flex-end;
  padding: clamp(8rem, 17vh, 12rem) var(--gutter) clamp(4rem, 9vh, 7rem);
  isolation: isolate;
}

.hero-video,
.hero-particles,
.hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-video {
  z-index: -4;
  object-fit: cover;
  filter: contrast(1.06) saturate(0.82);
}

.hero-particles {
  z-index: -3;
  opacity: 0.76;
}

.hero-shade {
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(5, 7, 6, 0.92) 0%, rgba(5, 7, 6, 0.42) 38%, transparent 67%),
    linear-gradient(0deg, rgba(5, 7, 6, 0.8) 0%, transparent 40%),
    radial-gradient(circle at 68% 46%, transparent 0 22%, rgba(5, 7, 6, 0.18) 64%, rgba(5, 7, 6, 0.55) 100%);
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: min(65rem, 80vw);
}

.kicker {
  margin: 0 0 1.1rem;
  color: var(--signal);
  font-size: clamp(0.62rem, 0.8vw, 0.75rem);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-title {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(5.2rem, 14vw, 13.5rem);
  font-weight: 400;
  letter-spacing: 0;
  line-height: 0.68;
  text-wrap: balance;
}

.hero-title span {
  display: block;
  width: max-content;
  max-width: 100%;
  transform-origin: left bottom;
  animation: titleReveal 1.1s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.hero-title span:last-child {
  margin-left: 0.45em;
  color: var(--bone);
  font-style: italic;
  animation-delay: 120ms;
}

.reveal-line {
  animation: lineReveal 900ms 380ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.hero-statement {
  margin: clamp(2.3rem, 5vh, 4rem) 0 0;
  font-family: var(--display);
  font-size: clamp(1.25rem, 2vw, 2rem);
  letter-spacing: 0;
}

.descent-link {
  display: inline-flex;
  gap: 1.2rem;
  align-items: center;
  margin-top: 1.4rem;
  color: var(--bone);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-decoration: none;
  text-transform: uppercase;
}

.descent-link-icon {
  display: grid;
  place-items: center;
  width: 2.5rem;
  aspect-ratio: 1;
  border: 1px solid rgba(237, 241, 233, 0.42);
  border-radius: 50%;
  transition: color 220ms ease, border-color 220ms ease, transform 220ms ease;
}

.descent-link:hover .descent-link-icon,
.descent-link:focus-visible .descent-link-icon {
  border-color: var(--signal);
  color: var(--signal);
  transform: translateY(0.3rem);
}

.hero-telemetry {
  position: absolute;
  z-index: 2;
  right: var(--gutter);
  bottom: clamp(4rem, 9vh, 7rem);
  display: grid;
  min-width: min(22rem, 28vw);
  border-top: 1px solid rgba(237, 241, 233, 0.35);
}

.hero-telemetry div {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid rgba(237, 241, 233, 0.18);
}

.hero-telemetry span {
  color: var(--bone-dim);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-telemetry strong {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.scroll-cue {
  position: absolute;
  z-index: 2;
  right: var(--gutter);
  bottom: 1.4rem;
  margin: 0;
  color: var(--bone-dim);
  font-size: 0.56rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.scroll-cue span {
  display: inline-block;
  width: 3rem;
  height: 1px;
  margin: 0 0.7rem 0.2rem 0;
  background: var(--signal);
  transform-origin: left;
  animation: scrollLine 2s ease-in-out infinite;
}

.descent {
  position: relative;
  height: 420vh;
  background: #030504;
}

.descent-sticky {
  position: sticky;
  top: 0;
  min-height: 100svh;
  overflow: hidden;
  background:
    linear-gradient(180deg, #081513 0%, #050908 46%, #020303 100%);
  isolation: isolate;
}

.descent-canvas {
  position: absolute;
  z-index: -1;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.9;
}

.descent-sticky::after {
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(3, 5, 4, 0.82), transparent 45%, rgba(3, 5, 4, 0.5)),
    radial-gradient(circle at 64% var(--beam-y, 25%), rgba(88, 242, 228, 0.14), transparent 18%);
  content: "";
  pointer-events: none;
}

.descent-heading {
  position: absolute;
  top: clamp(6rem, 12vh, 9rem);
  left: var(--gutter);
}

.descent-heading h2,
.tuner h2,
.revelation h2,
.finale h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(3.4rem, 8vw, 8.5rem);
  font-weight: 400;
  letter-spacing: 0;
  line-height: 0.84;
}

.depth-ruler {
  position: absolute;
  top: 12vh;
  right: var(--gutter);
  bottom: 12vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid rgba(237, 241, 233, 0.28);
  padding-right: 1rem;
  color: rgba(237, 241, 233, 0.46);
  font-size: 0.54rem;
  letter-spacing: 0.1em;
}

.depth-ruler span::after {
  position: absolute;
  right: 0;
  width: 0.45rem;
  height: 1px;
  margin-top: 0.65em;
  background: currentColor;
  content: "";
}

.depth-readout {
  position: absolute;
  right: calc(var(--gutter) + 4rem);
  bottom: 7vh;
  text-align: right;
}

.depth-readout span {
  display: block;
  color: var(--signal);
  font-size: clamp(2.6rem, 7vw, 7.2rem);
  letter-spacing: 0;
  line-height: 1;
  text-shadow: 0 0 2rem rgba(88, 242, 228, 0.25);
}

.depth-readout small {
  color: var(--bone-dim);
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.submersible {
  position: absolute;
  z-index: 3;
  top: var(--sub-y, 24%);
  left: var(--sub-x, 62%);
  width: clamp(11rem, 18vw, 18rem);
  transform: translate(-50%, -50%) rotate(var(--sub-tilt, -5deg));
  filter: drop-shadow(0 1rem 1.2rem rgba(0, 0, 0, 0.66));
  transition: filter 120ms linear;
}

.submersible-model {
  display: block;
  width: 100%;
  height: auto;
}

.sub-light {
  position: absolute;
  top: 39%;
  right: 82%;
  width: clamp(8rem, 18vw, 18rem);
  height: 42%;
  background: linear-gradient(90deg, transparent, rgba(237, 241, 233, 0.22));
  clip-path: polygon(0 5%, 100% 44%, 100% 58%, 0 100%);
  filter: blur(3px);
  transform-origin: right;
}

.sub-pulse {
  position: absolute;
  top: 60%;
  left: 38%;
  width: 48%;
  aspect-ratio: 1;
  border: 1px solid var(--signal);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  animation: sonarPulse 2.8s linear infinite;
}

.descent-chapters {
  position: absolute;
  bottom: 8vh;
  left: var(--gutter);
  width: min(26rem, 42vw);
}

.descent-chapters article {
  position: absolute;
  bottom: 0;
  left: 0;
  opacity: 0;
  transform: translateY(1.4rem);
  transition: opacity 460ms ease, transform 460ms ease;
}

.descent-chapters article.is-active {
  position: relative;
  opacity: 1;
  transform: translateY(0);
}

.descent-chapters span,
.signal-transcript span {
  color: var(--copper);
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.descent-chapters p {
  margin: 0.65rem 0 0;
  font-family: var(--display);
  font-size: clamp(1.35rem, 2.2vw, 2.25rem);
  letter-spacing: 0;
  line-height: 1.15;
}

.descent-progress {
  position: absolute;
  inset: auto 0 0;
  height: 2px;
  background: rgba(237, 241, 233, 0.12);
}

.descent-progress span {
  display: block;
  width: var(--descent-progress, 0%);
  height: 100%;
  background: var(--signal);
  box-shadow: 0 0 1rem var(--signal);
}

.tuner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(16rem, 0.72fr) minmax(32rem, 1.28fr);
  gap: clamp(4rem, 10vw, 12rem);
  min-height: 100svh;
  align-items: center;
  padding: clamp(7rem, 14vh, 11rem) var(--gutter);
  overflow: hidden;
  background:
    linear-gradient(115deg, #e7e6dc 0 42%, #cbc9bd 42% 43%, #d8d6cb 43% 100%);
  color: #121715;
}

.tuner::before {
  position: absolute;
  inset: 0;
  opacity: 0.26;
  background-image:
    linear-gradient(rgba(18, 23, 21, 0.11) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 23, 21, 0.11) 1px, transparent 1px);
  background-size: 42px 42px;
  content: "";
  pointer-events: none;
}

.tuner-intro,
.instrument {
  position: relative;
  z-index: 1;
}

.tuner .kicker {
  color: #805033;
}

.tuner-intro > p:last-child {
  max-width: 28rem;
  margin-top: 2rem;
  color: #4c544f;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.instrument {
  border: 1px solid rgba(18, 23, 21, 0.4);
  background: #0c1210;
  color: var(--bone);
  box-shadow: 1.2rem 1.2rem 0 rgba(18, 23, 21, 0.13), 0 2rem 5rem rgba(18, 23, 21, 0.24);
}

.instrument::before,
.instrument::after {
  position: absolute;
  width: 0.45rem;
  aspect-ratio: 1;
  border: 1px solid rgba(237, 241, 233, 0.32);
  border-radius: 50%;
  content: "";
}

.instrument::before { top: 0.7rem; left: 0.7rem; }
.instrument::after { right: 0.7rem; bottom: 0.7rem; }

.instrument-topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.3rem 1.5rem;
  border-bottom: 1px solid rgba(237, 241, 233, 0.18);
}

.instrument-topline p {
  margin: 0;
  color: var(--bone-dim);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.status-light {
  display: inline-block;
  width: 0.46rem;
  aspect-ratio: 1;
  margin-right: 0.7rem;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0.7rem rgba(240, 79, 61, 0.8);
}

.instrument.is-locked .status-light {
  background: var(--signal);
  box-shadow: 0 0 0.9rem var(--signal);
}

.instrument-topline output {
  color: var(--signal);
  font-size: clamp(1.25rem, 2.2vw, 2rem);
}

.waveform {
  display: block;
  width: 100%;
  height: clamp(12rem, 28vw, 22rem);
  border-bottom: 1px solid rgba(237, 241, 233, 0.18);
}

.frequency-control {
  padding: 1.5rem 1.5rem 1.1rem;
}

.frequency-control label {
  display: block;
  margin-bottom: 1rem;
  color: var(--bone-dim);
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.frequency-control input {
  width: 100%;
  height: 2rem;
  margin: 0;
  appearance: none;
  background: transparent;
  cursor: ew-resize;
}

.frequency-control input::-webkit-slider-runnable-track {
  height: 1px;
  background: linear-gradient(90deg, var(--copper), rgba(237, 241, 233, 0.28));
}

.frequency-control input::-moz-range-track {
  height: 1px;
  background: linear-gradient(90deg, var(--copper), rgba(237, 241, 233, 0.28));
}

.frequency-control input::-webkit-slider-thumb {
  width: 1.2rem;
  height: 1.8rem;
  margin-top: -0.88rem;
  appearance: none;
  border: 1px solid var(--signal);
  border-radius: 0;
  background: #0c1210;
  box-shadow: 0 0 1.2rem rgba(88, 242, 228, 0.3);
}

.frequency-control input::-moz-range-thumb {
  width: 1.2rem;
  height: 1.8rem;
  border: 1px solid var(--signal);
  border-radius: 0;
  background: #0c1210;
}

.frequency-scale {
  display: flex;
  justify-content: space-between;
  color: rgba(237, 241, 233, 0.46);
  font-size: 0.52rem;
}

.signal-transcript {
  overflow: hidden;
  max-height: 0;
  padding: 0 1.5rem;
  border-top: 1px solid transparent;
  opacity: 0;
  transition: max-height 560ms ease, padding 560ms ease, opacity 560ms ease, border-color 560ms ease;
}

.instrument.is-locked .signal-transcript {
  max-height: 14rem;
  padding: 1.5rem;
  border-color: rgba(88, 242, 228, 0.32);
  opacity: 1;
}

.signal-transcript p {
  margin: 0.85rem 0 0;
  color: var(--signal);
  font-family: var(--display);
  font-size: clamp(1.4rem, 2.5vw, 2.4rem);
  letter-spacing: 0;
  line-height: 1.15;
}

.revelation {
  position: relative;
  display: grid;
  min-height: 110svh;
  overflow: hidden;
  align-items: end;
  padding: clamp(8rem, 16vh, 14rem) var(--gutter) clamp(5rem, 9vh, 8rem);
  isolation: isolate;
}

.revelation-image,
.revelation-grid {
  position: absolute;
  z-index: -2;
  inset: 0;
}

.revelation-image {
  background: url("assets/abyssal-relay-poster.webp") center / cover no-repeat;
  filter: contrast(1.1) saturate(0.52) brightness(0.48);
  transform: scale(1.08);
}

.revelation::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(5, 7, 6, 0.9), rgba(5, 7, 6, 0.1) 68%),
    linear-gradient(0deg, rgba(5, 7, 6, 0.92), transparent 58%);
  content: "";
}

.revelation-grid {
  opacity: 0.28;
  background-image:
    linear-gradient(rgba(237, 241, 233, 0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(237, 241, 233, 0.22) 1px, transparent 1px);
  background-size: 8vw 8vw;
}

.revelation-copy {
  max-width: 55rem;
}

.revelation h2 {
  font-size: clamp(4.2rem, 11vw, 12rem);
}

.revelation-copy > p:last-child {
  max-width: 40rem;
  margin: 2rem 0 0;
  color: var(--bone-dim);
  font-size: clamp(0.72rem, 1vw, 0.86rem);
}

.object-data {
  position: absolute;
  right: var(--gutter);
  bottom: clamp(5rem, 9vh, 8rem);
  width: min(24rem, 28vw);
  margin: 0;
  border-top: 1px solid rgba(237, 241, 233, 0.35);
}

.object-data div {
  display: grid;
  grid-template-columns: 1fr 1.7fr;
  gap: 1rem;
  padding: 0.72rem 0;
  border-bottom: 1px solid rgba(237, 241, 233, 0.18);
}

.object-data dt {
  color: var(--bone-dim);
  font-size: 0.56rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.object-data dd {
  margin: 0;
  font-size: 0.62rem;
  text-align: right;
}

.finale {
  position: relative;
  display: flex;
  min-height: 100svh;
  flex-direction: column;
  justify-content: center;
  padding: 8rem var(--gutter) 5rem;
  overflow: hidden;
  background: var(--coral);
  color: #120b08;
}

.finale::after {
  position: absolute;
  top: 50%;
  right: -12vw;
  width: 54vw;
  aspect-ratio: 1;
  border: 1px solid rgba(18, 11, 8, 0.28);
  border-radius: 50%;
  box-shadow:
    0 0 0 6vw rgba(18, 11, 8, 0.04),
    0 0 0 12vw rgba(18, 11, 8, 0.04),
    0 0 0 18vw rgba(18, 11, 8, 0.035);
  content: "";
  transform: translateY(-50%);
}

.finale .kicker {
  color: #32100a;
}

.finale h2 {
  position: relative;
  z-index: 1;
  max-width: 80rem;
  font-size: clamp(5rem, 14vw, 15rem);
  line-height: 0.72;
}

.finale h2 em {
  margin-left: 0.42em;
  color: var(--bone);
  font-weight: 400;
}

.finale-action {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: min(28rem, 100%);
  margin-top: clamp(4rem, 8vh, 7rem);
  border: 0;
  border-bottom: 1px solid currentColor;
  padding: 1rem 0;
  background: transparent;
  color: currentColor;
  cursor: pointer;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.finale-action span:last-child {
  font-size: 1.4rem;
  transition: transform 220ms ease;
}

.finale-action:hover span:last-child,
.finale-action:focus-visible span:last-child {
  transform: translate(0.3rem, -0.3rem);
}

.back-link,
.finale-coordinate {
  position: absolute;
  z-index: 2;
  bottom: 2rem;
  font-size: 0.57rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.back-link {
  left: var(--gutter);
  text-underline-offset: 0.3rem;
}

.finale-coordinate {
  right: var(--gutter);
  margin: 0;
}

.sonar-cursor {
  position: fixed;
  z-index: 80;
  top: 0;
  left: 0;
  width: 2.1rem;
  aspect-ratio: 1;
  border: 1px solid rgba(88, 242, 228, 0.68);
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -50%);
  transition: width 160ms ease, opacity 160ms ease, border-color 160ms ease;
}

.sonar-cursor span {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0.22rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--signal);
  transform: translate(-50%, -50%);
}

.sonar-cursor.is-visible { opacity: 1; }
.sonar-cursor.is-active { width: 3.8rem; border-color: var(--copper); }

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 0.35rem;
}

@keyframes titleReveal {
  from { opacity: 0; transform: translateY(45%) rotateX(-52deg); filter: blur(14px); }
  to { opacity: 1; transform: translateY(0) rotateX(0); filter: blur(0); }
}

@keyframes lineReveal {
  from { opacity: 0; transform: translateY(1rem); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes statusPulse {
  50% { opacity: 0.36; box-shadow: 0 0 0.2rem var(--signal); }
}

@keyframes soundBar {
  from { height: 24%; }
  to { height: 100%; }
}

@keyframes scrollLine {
  0%, 100% { transform: scaleX(0.22); opacity: 0.45; }
  50% { transform: scaleX(1); opacity: 1; }
}

@keyframes sonarPulse {
  from { opacity: 0.9; transform: translate(-50%, -50%) scale(0.4); }
  to { opacity: 0; transform: translate(-50%, -50%) scale(4.5); }
}

@media (max-width: 860px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .header-status {
    display: none;
  }

  .hero {
    align-items: flex-end;
    padding-bottom: 6.5rem;
  }

  .hero-copy {
    width: 100%;
  }

  .hero-title {
    font-size: clamp(4.7rem, 24vw, 8rem);
    line-height: 0.72;
  }

  .hero-title span:last-child {
    margin-left: 0.16em;
  }

  .hero-telemetry {
    display: none;
  }

  .hero-shade {
    background:
      linear-gradient(0deg, rgba(5, 7, 6, 0.94) 0%, rgba(5, 7, 6, 0.2) 68%),
      linear-gradient(90deg, rgba(5, 7, 6, 0.7), transparent);
  }

  .descent-heading h2 {
    font-size: clamp(3.5rem, 15vw, 6rem);
  }

  .descent-heading {
    top: 6.5rem;
  }

  .depth-ruler {
    right: 1rem;
    opacity: 0.55;
  }

  .depth-readout {
    right: 3.4rem;
    bottom: 18vh;
  }

  .submersible {
    left: var(--sub-x-mobile, 58%);
    width: clamp(10rem, 39vw, 14rem);
  }

  .descent-chapters {
    bottom: 7vh;
    width: calc(100% - 5rem);
  }

  .tuner {
    grid-template-columns: 1fr;
    gap: 3rem;
    min-height: auto;
    background: #d8d6cb;
  }

  .instrument {
    box-shadow: 0.65rem 0.65rem 0 rgba(18, 23, 21, 0.13);
  }

  .object-data {
    position: relative;
    right: auto;
    bottom: auto;
    width: 100%;
    margin-top: 4rem;
  }

  .revelation {
    align-content: end;
  }

  .revelation h2 {
    font-size: clamp(4rem, 18vw, 7rem);
  }

  .finale h2 {
    font-size: clamp(5rem, 23vw, 9rem);
  }

  .finale h2 em {
    margin-left: 0.1em;
  }

  .finale-coordinate {
    display: none;
  }
}

@media (max-width: 520px) {
  .sound-toggle [data-sound-label] {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }

  .hero-title {
    font-size: clamp(4.4rem, 25vw, 6.7rem);
  }

  .hero-video {
    object-position: 59% center;
  }

  .scroll-cue {
    left: var(--gutter);
    right: auto;
  }

  .descent-heading .kicker {
    max-width: 14rem;
  }

  .depth-readout span {
    font-size: 2.65rem;
  }

  .descent-chapters p {
    font-size: 1.25rem;
  }

  .waveform {
    height: 13rem;
  }

  .instrument-topline {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.55rem;
  }

  .signal-transcript p {
    font-size: 1.25rem;
  }
}

@media (pointer: coarse) {
  .sonar-cursor {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .hero-video {
    display: none;
  }

  .hero {
    background: url("assets/abyssal-relay-poster.webp") center / cover no-repeat;
  }
}