html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.ob-system {
  position: relative;
  width: 168px;
  height: 168px;
}

.ob-core {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 24px;
  height: 24px;
  margin: -12px 0 0 -12px;
  border-radius: 50%;
  background: #6ec8ff;
}

.ob-dot {
  position: absolute;
  border-radius: 50%;
}

.od-s {
  top: 26px;
  left: calc(50% - 6px);
  width: 12px;
  height: 12px;
  background: #fff7e6;
  transform-origin: 50% 58px;
}

.od-m {
  top: 39px;
  left: calc(50% - 9px);
  width: 18px;
  height: 18px;
  background: #ff9ebb;
  transform-origin: 50% 45px;
}

.od-l {
  top: 3px;
  left: calc(50% - 13px);
  width: 26px;
  height: 26px;
  background: #4cd4a6;
  transform-origin: 50% 81px;
}

.ob-system.is-loading .od-s,
.ob-system.is-demo .od-s {
  animation: ob-spin-a 1s linear infinite;
}

.ob-system.is-loading .od-m,
.ob-system.is-demo .od-m {
  animation: ob-spin-b 2s linear infinite;
}

.ob-system.is-loading .od-l,
.ob-system.is-demo .od-l {
  animation: ob-spin-c 2s linear infinite;
}

@keyframes ob-spin-a {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
@keyframes ob-spin-b {
  from {
    transform: rotate(120deg);
  }
  to {
    transform: rotate(480deg);
  }
}
@keyframes ob-spin-c {
  from {
    transform: rotate(240deg);
  }
  to {
    transform: rotate(600deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .ob-system.is-loading .od-s,
  .ob-system.is-loading .od-m,
  .ob-system.is-loading .od-l,
  .ob-system.is-demo .od-s,
  .ob-system.is-demo .od-m,
  .ob-system.is-demo .od-l {
    animation: none !important;
    transform: none !important;
  }
}