* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  background: radial-gradient(1200px 700px at 50% 28%, #131a2c 0%, #070a12 70%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Orbitron', 'Segoe UI', system-ui, sans-serif;
  color: #9fb4d8;
  min-height: 100vh;
  overflow: hidden;
}
#stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 16px;
}
#frame {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  box-shadow:
    0 0 0 1px #2a3a5f,
    0 0 45px rgba(53, 242, 255, .12),
    0 30px 80px rgba(0, 0, 0, .6);
}
canvas {
  display: block;
  width: min(96vw, calc((100vh - 120px) * 4 / 3), 1000px);
  height: auto;
  background: #05070d;
}
#crt {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity .3s;
}
#crt.on {
  opacity: 1;
  background: repeating-linear-gradient(0deg, rgba(0, 0, 0, .16) 0 1px, transparent 1px 3px);
  box-shadow: inset 0 0 120px rgba(0, 0, 0, .55);
  mix-blend-mode: multiply;
}
#hint {
  font-size: 11px;
  letter-spacing: .12em;
  color: #5f7396;
  text-transform: uppercase;
  user-select: none;
}