html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  font-family: "Trebuchet MS", "Verdana", sans-serif;
  background:
    radial-gradient(circle at top, rgba(111, 194, 255, 0.18), transparent 30%),
    linear-gradient(180deg, #02111b 0%, #08263d 44%, #0d4669 100%);
  color: #e4f3ff;
}

.placeholder {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 64px;
}

.placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(140, 206, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 206, 255, 0.08) 1px, transparent 1px);
  background-size: 52px 52px;
  opacity: 0.38;
}

.panel {
  position: relative;
  z-index: 1;
  width: min(100%, 820px);
  padding: 56px 72px;
  border: 1px solid rgba(150, 216, 255, 0.4);
  border-radius: 32px;
  background: rgba(6, 28, 46, 0.76);
  box-shadow:
    0 0 0 1px rgba(119, 197, 255, 0.12) inset,
    0 34px 100px rgba(0, 0, 0, 0.34);
  text-align: center;
  backdrop-filter: blur(12px);
}

.eyebrow {
  margin: 0 0 20px;
  color: #8fd4ff;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.42rem;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 3.4rem;
  line-height: 1.2;
  font-weight: 700;
  text-shadow: 0 0 22px rgba(125, 212, 255, 0.18);
}

.signal-ring {
  position: absolute;
  border: 1px solid rgba(117, 196, 255, 0.16);
  border-radius: 50%;
}

.signal-ring-one {
  width: 520px;
  height: 520px;
}

.signal-ring-two {
  width: 840px;
  height: 840px;
}

.signal-ring-three {
  width: 1180px;
  height: 1180px;
}