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);
}

.us {
  width: min(320px, 88vw);
}

.us__radio {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.us__nav {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.us__tab {
  padding: 12px 8px;
  text-align: center;
  font-weight: 600;
  font-size: clamp(13px, 3.6vw, 15px);
  line-height: 1;
  font-family: inherit;
  color: rgba(255, 247, 230, 0.6);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.us__indicator {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 33.3333333333%;
  height: 3px;
  background: #2f6df6;
  border-radius: 999px;
  transform: translateX(0);
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.us__nav::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: -1;
  width: 33.3333333333%;
  height: 3px;
  border-radius: 999px;
  background: rgba(47, 109, 246, 0.35);
  filter: blur(2px);
  opacity: 0;
}

#us-1:checked ~ .us__nav .us__indicator {
  transform: translateX(0%);
}

#us-2:checked ~ .us__nav .us__indicator {
  transform: translateX(100%);
}

#us-3:checked ~ .us__nav .us__indicator {
  transform: translateX(200%);
}

#us-1:checked ~ .us__nav label[for=us-1],
#us-2:checked ~ .us__nav label[for=us-2],
#us-3:checked ~ .us__nav label[for=us-3] {
  color: #fff7e6;
}

.us__panels {
  position: relative;
  display: grid;
  margin-top: 16px;
  min-height: 40px;
}

.us__panel {
  grid-area: 1/1;
  margin: 0;
  color: rgba(255, 247, 230, 0.82);
  font-weight: 400;
  font-size: clamp(12px, 3.2vw, 13px);
  line-height: 1.5;
  font-family: inherit;
  opacity: 0;
  transition: opacity 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

#us-1:checked ~ .us__panels .us__panel--1,
#us-2:checked ~ .us__panels .us__panel--2,
#us-3:checked ~ .us__panels .us__panel--3 {
  opacity: 1;
}

.us.is-demo .us__indicator {
  animation: us-loop-inertia 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.us.is-demo .us__nav::after {
  animation: us-trail-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
  animation-delay: 120ms;
}

.us.is-demo .us__panel--1 {
  animation: us-panel-1 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.us.is-demo .us__panel--2 {
  animation: us-panel-2 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.us.is-demo .us__panel--3 {
  animation: us-panel-3 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes us-loop-inertia {
  0%, 15% {
    transform: translateX(0%);
  }
  30% {
    transform: translateX(108%);
  }
  33%, 48% {
    transform: translateX(100%);
  }
  63% {
    transform: translateX(216%);
  }
  66%, 81% {
    transform: translateX(200%);
  }
  100% {
    transform: translateX(0%);
  }
}
@keyframes us-trail-loop {
  0%, 15% {
    transform: translateX(0%);
    opacity: 0;
  }
  24% {
    opacity: 0.35;
  }
  30% {
    transform: translateX(108%);
    opacity: 0.35;
  }
  33%, 40% {
    transform: translateX(100%);
    opacity: 0.35;
  }
  48% {
    transform: translateX(100%);
    opacity: 0;
  }
  63% {
    transform: translateX(216%);
    opacity: 0.35;
  }
  66%, 73% {
    transform: translateX(200%);
    opacity: 0.35;
  }
  81% {
    transform: translateX(200%);
    opacity: 0;
  }
  100% {
    transform: translateX(0%);
    opacity: 0;
  }
}
@keyframes us-panel-1 {
  0%, 15% {
    opacity: 1;
  }
  30%, 100% {
    opacity: 0;
  }
}
@keyframes us-panel-2 {
  0%, 30% {
    opacity: 0;
  }
  45%, 63% {
    opacity: 1;
  }
  78%, 100% {
    opacity: 0;
  }
}
@keyframes us-panel-3 {
  0%, 63% {
    opacity: 0;
  }
  78%, 96% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .us__indicator, .us__panel {
    transition: none;
  }
  .us.is-demo .us__indicator,
  .us.is-demo .us__nav::after,
  .us.is-demo .us__panel--1,
  .us.is-demo .us__panel--2,
  .us.is-demo .us__panel--3 {
    animation: none !important;
  }
  .us__nav::after {
    opacity: 0;
  }
}