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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.vt {
  display: flex;
  gap: 24px;
  width: min(280px, 82vw);
}

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

.vt__nav {
  position: relative;
  display: flex;
  flex-direction: column;
  flex: 0 0 auto;
  border-left: 2px solid rgba(255, 247, 230, 0.18);
  padding-left: 16px;
}

.vt__tab {
  height: 36px;
  display: flex;
  align-items: center;
  font-weight: 600;
  font-size: clamp(12px, 3.4vw, 14px);
  line-height: 1;
  font-family: inherit;
  color: rgba(23, 20, 26, 0.85);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.vt__indicator {
  position: absolute;
  left: -2px;
  top: 0;
  width: 2px;
  height: 36px;
  background: #fff7e6;
  border-radius: 4px;
  transform: translateY(0);
  transition: transform 300ms linear(0, 0.051, 0.176, 0.341, 0.518, 0.685, 0.831, 0.947, 1.032, 1.087, 1.117, 1.126, 1.121, 1.105, 1.085, 1.062, 1.041, 1.022, 1.008, 0.997, 1);
}

.vt__trail {
  position: absolute;
  left: -2px;
  top: 0;
  width: 2px;
  height: 36px;
  background: #fff7e6;
  border-radius: 4px;
  opacity: 0.32;
  filter: blur(1.5px);
  transform: translateY(0);
  transition: transform 540ms ease-out;
}

#vt-1:checked ~ .vt__nav .vt__indicator {
  transform: translateY(0);
}

#vt-2:checked ~ .vt__nav .vt__indicator {
  transform: translateY(36px);
}

#vt-3:checked ~ .vt__nav .vt__indicator {
  transform: translateY(72px);
}

#vt-1:checked ~ .vt__nav .vt__trail {
  transform: translateY(0);
}

#vt-2:checked ~ .vt__nav .vt__trail {
  transform: translateY(36px);
}

#vt-3:checked ~ .vt__nav .vt__trail {
  transform: translateY(72px);
}

#vt-1:checked ~ .vt__nav label[for=vt-1],
#vt-2:checked ~ .vt__nav label[for=vt-2],
#vt-3:checked ~ .vt__nav label[for=vt-3] {
  color: #17141a;
}

.vt__panels {
  position: relative;
  display: grid;
  flex: 1 1 auto;
  min-width: 0;
}

.vt__panel {
  grid-area: 1/1;
  margin: 0;
  color: #17141a;
  font-weight: 400;
  font-size: clamp(12px, 3.2vw, 13px);
  line-height: 1.5;
  font-family: inherit;
  opacity: 0;
  transition: opacity 300ms linear(0, 0.051, 0.176, 0.341, 0.518, 0.685, 0.831, 0.947, 1.032, 1.087, 1.117, 1.126, 1.121, 1.105, 1.085, 1.062, 1.041, 1.022, 1.008, 0.997, 1);
}

#vt-1:checked ~ .vt__panels .vt__panel--1,
#vt-2:checked ~ .vt__panels .vt__panel--2,
#vt-3:checked ~ .vt__panels .vt__panel--3 {
  opacity: 1;
}

.vt.is-demo .vt__indicator {
  animation: vt-loop 2s linear(0, 0.051, 0.176, 0.341, 0.518, 0.685, 0.831, 0.947, 1.032, 1.087, 1.117, 1.126, 1.121, 1.105, 1.085, 1.062, 1.041, 1.022, 1.008, 0.997, 1) infinite;
}

.vt.is-demo .vt__trail {
  animation: vt-loop 2s linear(0, 0.051, 0.176, 0.341, 0.518, 0.685, 0.831, 0.947, 1.032, 1.087, 1.117, 1.126, 1.121, 1.105, 1.085, 1.062, 1.041, 1.022, 1.008, 0.997, 1) infinite;
  animation-delay: 0.12s;
}

.vt.is-demo .vt__panel--1 {
  animation: vt-panel-1 2s linear(0, 0.051, 0.176, 0.341, 0.518, 0.685, 0.831, 0.947, 1.032, 1.087, 1.117, 1.126, 1.121, 1.105, 1.085, 1.062, 1.041, 1.022, 1.008, 0.997, 1) infinite;
}

.vt.is-demo .vt__panel--2 {
  animation: vt-panel-2 2s linear(0, 0.051, 0.176, 0.341, 0.518, 0.685, 0.831, 0.947, 1.032, 1.087, 1.117, 1.126, 1.121, 1.105, 1.085, 1.062, 1.041, 1.022, 1.008, 0.997, 1) infinite;
}

.vt.is-demo .vt__panel--3 {
  animation: vt-panel-3 2s linear(0, 0.051, 0.176, 0.341, 0.518, 0.685, 0.831, 0.947, 1.032, 1.087, 1.117, 1.126, 1.121, 1.105, 1.085, 1.062, 1.041, 1.022, 1.008, 0.997, 1) infinite;
}

@keyframes vt-loop {
  0%, 15% {
    transform: translateY(0);
  }
  33%, 48% {
    transform: translateY(36px);
  }
  66%, 81% {
    transform: translateY(72px);
  }
  100% {
    transform: translateY(0);
  }
}
@keyframes vt-panel-1 {
  0%, 15% {
    opacity: 1;
  }
  30%, 100% {
    opacity: 0;
  }
}
@keyframes vt-panel-2 {
  0%, 30% {
    opacity: 0;
  }
  45%, 63% {
    opacity: 1;
  }
  78%, 100% {
    opacity: 0;
  }
}
@keyframes vt-panel-3 {
  0%, 63% {
    opacity: 0;
  }
  78%, 96% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .vt__indicator, .vt__panel, .vt__trail {
    transition: none;
  }
  .vt.is-demo .vt__indicator,
  .vt.is-demo .vt__panel--1,
  .vt.is-demo .vt__panel--2,
  .vt.is-demo .vt__panel--3,
  .vt.is-demo .vt__trail {
    animation: none !important;
  }
  .vt__trail {
    opacity: 0;
  }
}