:root {
  --abyss: #030810;
  --deep: #071421;
  --water: #0c2330;
  --line: rgba(86, 218, 211, .22);
  --sonar: #58ded5;
  --sonar-soft: #9aeee3;
  --bone: #f4e6b5;
  --gold: #efb52d;
  --danger: #eb463b;
  --muted: #81959a;
  --display: "Copperplate", "Copperplate Gothic Light", fantasy;
  --instrument: "American Typewriter", "Courier Prime", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--bone);
  background:
    repeating-linear-gradient(0deg, rgba(88, 222, 213, .025) 0 1px, transparent 1px 24px),
    radial-gradient(circle at 77% 16%, rgba(38, 125, 130, .2), transparent 27rem),
    var(--abyss);
  font-family: var(--instrument);
  letter-spacing: .035em;
}
a { color: inherit; }
button { font: inherit; }

.masthead {
  position: sticky;
  z-index: 20;
  top: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 66px;
  padding: 0 clamp(18px, 5vw, 78px);
  border-bottom: 1px solid var(--line);
  background: rgba(3, 8, 16, .9);
  backdrop-filter: blur(14px);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: .15em;
}
.brand { text-decoration: none; font-family: var(--display); font-size: 19px; }
.brand span { color: var(--sonar); }
.brand b { margin-left: 7px; color: var(--gold); font-size: 10px; }
nav { display: flex; gap: clamp(18px, 4vw, 48px); }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--sonar); }
.rom-link { justify-self: end; color: var(--bone); text-decoration: none; }
.rom-link span { color: var(--sonar); }

main { overflow: hidden; }
.hero {
  position: relative;
  min-height: calc(100vh - 66px);
  display: grid;
  grid-template-columns: minmax(310px, .8fr) minmax(480px, 1.2fr);
  gap: clamp(44px, 7vw, 120px);
  align-items: center;
  padding: clamp(64px, 8vw, 126px) clamp(22px, 7vw, 110px);
}
.hero::after {
  position: absolute;
  right: -11rem;
  bottom: -18rem;
  width: 46rem;
  height: 46rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  content: "";
  pointer-events: none;
}
.depth-scale {
  position: absolute;
  left: 14px;
  top: 12%;
  bottom: 12%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: #47646b;
  font-size: 8px;
  writing-mode: vertical-rl;
}
.eyebrow, .section-tag {
  margin: 0 0 24px;
  color: var(--sonar);
  text-transform: uppercase;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
}
h1 {
  margin: 0;
  color: var(--bone);
  font-family: var(--display);
  font-size: clamp(70px, 10vw, 158px);
  line-height: .72;
  letter-spacing: -.08em;
  text-transform: uppercase;
}
h1 span, h1 em { display: block; }
h1 em { margin: .13em 0 0 .2em; color: var(--gold); font-style: normal; }
.lede { max-width: 36rem; margin: 38px 0 28px; font-size: clamp(17px, 2vw, 24px); line-height: 1.55; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  display: inline-block;
  padding: 15px 18px;
  border: 1px solid var(--sonar);
  text-decoration: none;
  text-transform: uppercase;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
}
.button.primary { color: var(--abyss); background: var(--sonar); }
.button.primary:hover { background: var(--bone); border-color: var(--bone); }
.button.ghost { color: var(--sonar); }
.button.ghost:hover { color: var(--bone); border-color: var(--bone); }
.spec-strip { display: flex; gap: clamp(16px, 3vw, 34px); margin: 38px 0 0; }
.spec-strip div { padding-left: 10px; border-left: 1px solid var(--danger); }
.spec-strip dt { color: var(--muted); text-transform: uppercase; font-size: 8px; }
.spec-strip dd { margin: 5px 0 0; font-size: 11px; }

figure { margin: 0; }
.hero-art { position: relative; z-index: 1; }
.radar {
  position: absolute;
  z-index: -1;
  inset: 50% auto auto 50%;
  width: min(68vw, 760px);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  border: 1px solid rgba(88, 222, 213, .25);
  border-radius: 50%;
  background: repeating-radial-gradient(circle, transparent 0 20%, rgba(88, 222, 213, .12) 20.2% 20.5%, transparent 20.8% 40%);
}
.radar::before, .radar::after { position: absolute; inset: 50% 0 auto; height: 1px; background: var(--line); content: ""; }
.radar::after { inset: 0 auto 0 50%; width: 1px; height: auto; }
.radar i { position: absolute; border-radius: 50%; background: var(--sonar); box-shadow: 0 0 12px var(--sonar); }
.radar i:nth-child(1) { width: 5px; height: 5px; left: 27%; top: 36%; }
.radar i:nth-child(2) { width: 3px; height: 3px; right: 20%; top: 58%; }
.radar i:nth-child(3) { width: 4px; height: 4px; left: 42%; bottom: 18%; }
.screen-shell { padding: clamp(10px, 1.5vw, 18px); border: 1px solid var(--sonar); background: #02060c; box-shadow: 24px 24px 0 rgba(235, 70, 59, .75); }
.screen-label { display: flex; justify-content: space-between; padding: 0 2px 10px; color: var(--sonar); font-size: 8px; letter-spacing: .16em; }
.hero-art img, .comparison img, .capture-frame img, .surface img {
  display: block;
  width: 960px;
  max-width: 100%;
  height: auto;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}
.hero-art figcaption { margin: 34px 0 0 18px; color: var(--muted); font-size: 9px; text-transform: uppercase; }

.signal {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: clamp(50px, 8vw, 130px);
  align-items: center;
  padding: clamp(80px, 11vw, 170px) clamp(22px, 8vw, 132px);
  color: var(--abyss);
  background:
    radial-gradient(circle at 14% 70%, rgba(88, 222, 213, .32), transparent 25rem),
    var(--bone);
}
.signal .section-tag { color: #147c7d; }
h2 { margin: 0; font-family: var(--display); font-size: clamp(45px, 6vw, 91px); line-height: .92; letter-spacing: -.05em; text-transform: uppercase; }
h2 span { color: #b6302d; }
.signal-copy > p:not(.section-tag) { max-width: 38rem; margin: 30px 0; font-size: 17px; line-height: 1.7; }
.ping-toggle { display: flex; align-items: center; gap: 16px; width: 100%; max-width: 330px; padding: 14px 16px; border: 1px solid #167778; color: var(--abyss); background: transparent; cursor: pointer; text-align: left; }
.ping-toggle:hover { background: rgba(88, 222, 213, .18); }
.ping-dot { width: 30px; height: 30px; flex: 0 0 auto; border: 2px solid #167778; border-radius: 50%; box-shadow: inset 0 0 0 7px var(--bone), inset 0 0 0 15px #167778; }
.ping-toggle[aria-pressed="false"] .ping-dot { box-shadow: none; }
.toggle-copy b, .toggle-copy small { display: block; }
.toggle-copy b { text-transform: uppercase; font-size: 12px; letter-spacing: .12em; }
.toggle-copy small { margin-top: 4px; color: #476064; }
.comparison { position: relative; border: 1px solid #1c454c; background: var(--abyss); box-shadow: 20px 20px 0 var(--danger); }
.scope-label { display: flex; justify-content: space-between; margin: 0; padding: 12px 14px; color: var(--sonar); font-size: 9px; }
.comparison figcaption { padding: 15px; color: #acc1bc; font-size: 10px; line-height: 1.5; }

.dives { display: grid; grid-template-columns: .7fr 1.3fr; gap: clamp(50px, 8vw, 130px); padding: clamp(80px, 11vw, 170px) clamp(22px, 8vw, 132px); }
.dives ol { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.dives li { display: grid; grid-template-columns: 50px 1fr auto; gap: 22px; align-items: center; min-height: 145px; border-bottom: 1px solid var(--line); }
.dive-number { color: var(--sonar); font-family: var(--display); font-size: 34px; }
.dives h3 { margin: 0 0 8px; color: var(--gold); font-family: var(--display); font-size: 26px; text-transform: uppercase; }
.dives li p { max-width: 37rem; margin: 0; color: #a6b6b4; line-height: 1.55; }
.dives li > b { color: var(--muted); font-size: 10px; }

.evidence { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); }
.evidence figure { padding: clamp(24px, 4vw, 58px); background: var(--deep); }
.capture-frame { border: 1px solid #24414b; background: var(--abyss); }
.evidence figcaption { margin-top: 20px; text-transform: uppercase; font-size: 11px; }
.evidence figcaption span { margin-right: 12px; color: var(--danger); }

.controls { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(50px, 9vw, 150px); padding: clamp(80px, 11vw, 170px) clamp(22px, 8vw, 132px); }
.control-copy > p:last-child { max-width: 29rem; margin-top: 28px; color: var(--muted); line-height: 1.7; }
.controls dl { margin: 0; border-top: 1px solid var(--line); }
.controls dl div { display: grid; grid-template-columns: 110px 1fr; min-height: 86px; align-items: center; border-bottom: 1px solid var(--line); }
.controls dt { color: var(--gold); font-family: var(--display); font-size: 15px; }
.controls dd { margin: 0; }
.controls dd b, .controls dd span { display: block; }
.controls dd b { margin-bottom: 5px; color: var(--bone); text-transform: uppercase; font-size: 11px; }
.controls dd span { color: var(--muted); font-size: 12px; line-height: 1.5; }

.surface { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(45px, 8vw, 120px); align-items: center; padding: clamp(80px, 10vw, 150px) clamp(22px, 8vw, 132px); color: var(--abyss); background: var(--danger); }
.surface figure { border: 10px solid var(--bone); box-shadow: -18px 18px 0 var(--gold); }
.surface .section-tag { color: var(--abyss); }
.surface p:not(.section-tag) { max-width: 35rem; margin: 28px 0; line-height: 1.7; }
.surface .button.primary { color: var(--bone); border-color: var(--abyss); background: var(--abyss); }

footer { display: flex; justify-content: space-between; gap: 24px; padding: 30px clamp(22px, 7vw, 110px); color: var(--muted); text-transform: uppercase; font-size: 9px; }
footer b { color: var(--sonar); }

@media (max-width: 920px) {
  .masthead { grid-template-columns: 1fr auto; }
  nav { display: none; }
  .hero, .signal, .dives, .controls, .surface { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .radar { width: 90vw; }
  .evidence { grid-template-columns: 1fr; }
  .dives header { max-width: 32rem; }
}
@media (max-width: 540px) {
  h1 { font-size: 66px; }
  .depth-scale { display: none; }
  .hero { padding-top: 52px; }
  .spec-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
  .screen-shell, .comparison { box-shadow: 9px 9px 0 rgba(235, 70, 59, .8); }
  .dives li { grid-template-columns: 34px 1fr; }
  .dives li > b { display: none; }
  .controls dl div { grid-template-columns: 88px 1fr; }
  footer { display: block; line-height: 1.7; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }