:root {
  color-scheme: dark;
  background: #050505;
}

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #050505;
}

body {
  font-family: Arial, Helvetica, "Noto Sans KR", sans-serif;
}

#stage,
#view {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
}

#view {
  display: block;
  background: #050505;
}

#camera {
  position: fixed;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

#instruction {
  position: fixed;
  left: 18px;
  bottom: 16px;
  z-index: 2;
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 9px;
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: 0.18em;
  opacity: 0;
  pointer-events: none;
  transition: opacity 750ms ease;
}

#instruction.visible { opacity: 1; }

#instruction.error {
  max-width: min(460px, calc(100vw - 36px));
  color: rgba(214, 40, 40, 0.9);
  letter-spacing: 0.08em;
  opacity: 1;
}