:root {
  color-scheme: dark;
  --ink: #dffaff;
  --cyan: #52e5ff;
  --violet: #8075ff;
  --bg: #02070d;
}

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--bg);
}

body {
  min-height: 100svh;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

body::before,
body::after {
  position: fixed;
  inset: 0;
  pointer-events: none;
  content: "";
}

body::before {
  z-index: 1;
  opacity: .42;
  background:
    linear-gradient(rgb(82 229 255 / .055) 1px, transparent 1px),
    linear-gradient(90deg, rgb(82 229 255 / .055) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(ellipse at 50% 50%, black 0%, transparent 72%);
  transform: perspective(650px) rotateX(58deg) scale(1.65) translateY(17%);
}

body::after {
  z-index: 4;
  background: radial-gradient(ellipse at center, transparent 22%, rgb(0 3 8 / .86) 100%);
}

canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
}

main {
  position: relative;
  z-index: 2;
  display: grid;
  min-height: 100svh;
  place-items: center;
  perspective: 1000px;
}

.signal {
  position: relative;
  width: max-content;
  max-width: 94vw;
  margin: 0;
  filter: drop-shadow(0 0 2rem rgb(82 229 255 / .12));
  transform: rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)) translateZ(0);
  transition: transform 250ms cubic-bezier(.2, .8, .2, 1);
}

.banner {
  margin: 0;
  color: var(--ink);
  font: 750 clamp(.72rem, min(6.3vw, 10.2vh), 8rem)/.86 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  letter-spacing: -.08em;
  white-space: pre;
  text-shadow:
    0 0 .07em #fff,
    0 0 .34em rgb(82 229 255 / .6),
    0 0 1.1em rgb(82 229 255 / .18);
  user-select: none;
}

.echo {
  position: absolute;
  inset: 0;
  opacity: .16;
}

.echo-a {
  color: var(--cyan);
  transform: translateZ(-80px) scale(1.035);
  animation: breathe-a 6s ease-in-out infinite;
}

.echo-b {
  color: var(--violet);
  transform: translateZ(-150px) scale(1.07);
  animation: breathe-b 6s ease-in-out infinite;
}

.signal.pulse .echo-a { animation: pulse-a 700ms ease-out; }
.signal.pulse .echo-b { animation: pulse-b 700ms ease-out; }

@keyframes breathe-a {
  0%, 100% { opacity: .08; transform: translateZ(-80px) scale(1.025); }
  50% { opacity: .2; transform: translateZ(-80px) scale(1.045); }
}

@keyframes breathe-b {
  0%, 100% { opacity: .05; transform: translateZ(-150px) scale(1.055); }
  50% { opacity: .13; transform: translateZ(-150px) scale(1.08); }
}

@keyframes pulse-a {
  from { opacity: .4; transform: translateZ(-70px) scale(1); }
  to { opacity: 0; transform: translateZ(-70px) scale(1.18); }
}

@keyframes pulse-b {
  from { opacity: .35; transform: translateZ(-140px) scale(1); }
  to { opacity: 0; transform: translateZ(-140px) scale(1.3); }
}

@media (prefers-reduced-motion: reduce) {
  .echo { animation: none; }
  .signal { transition: none; }
}