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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.stage {
  position: relative;
}

.btn {
  position: relative;
  border: 0;
  border-radius: 12px;
  padding: 16px 32px;
  background: #17141a;
  color: #fff7e6;
  font-weight: 700;
  font-size: clamp(15px, 4vw, 18px);
  line-height: 1;
  font-family: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.btn::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -8px;
  width: 70%;
  height: 8px;
  border-radius: 50%;
  background: rgba(23, 20, 26, 0.35);
  filter: blur(2px);
  transform: translateX(-50%) scale(1, 1);
}

.tag {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 12px;
  border-radius: 8px;
  background: rgba(23, 20, 26, 0.12);
  color: #17141a;
  font-weight: 700;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
}

.btn.o-poyon:hover,
.btn.o-poyon:focus-visible {
  animation: o-poyon 550ms cubic-bezier(0.34, 1.56, 0.64, 1) 1;
}

.btn.o-poyon:hover::after,
.btn.o-poyon:focus-visible::after {
  animation: o-poyon-shadow 550ms cubic-bezier(0.34, 1.56, 0.64, 1) 1;
}

.btn.o-poyon.is-demo {
  animation: o-poyon-loop 2s cubic-bezier(0.34, 1.56, 0.64, 1) infinite;
}

.btn.o-poyon.is-demo::after {
  animation: o-poyon-shadow-loop 2s cubic-bezier(0.34, 1.56, 0.64, 1) infinite;
}

@keyframes o-poyon {
  0% {
    transform: scale(1, 1);
  }
  30% {
    transform: scale(0.84, 1.09);
  }
  55% {
    transform: scale(1.2, 0.89);
  }
  75% {
    transform: scale(0.94, 1.03);
  }
  100% {
    transform: scale(1, 1);
  }
}
@keyframes o-poyon-loop {
  0%, 60% {
    transform: scale(1, 1);
  }
  74% {
    transform: scale(0.84, 1.09);
  }
  85% {
    transform: scale(1.2, 0.89);
  }
  93% {
    transform: scale(0.94, 1.03);
  }
  100% {
    transform: scale(1, 1);
  }
}
@keyframes o-poyon-shadow {
  0% {
    transform: translateX(-50%) scale(1, 1);
    opacity: 0.85;
  }
  30% {
    transform: translateX(-50%) scale(1.25, 1.35);
    opacity: 1;
  }
  55% {
    transform: translateX(-50%) scale(0.65, 0.8);
    opacity: 0.35;
  }
  75% {
    transform: translateX(-50%) scale(1.08, 1.15);
    opacity: 0.9;
  }
  100% {
    transform: translateX(-50%) scale(1, 1);
    opacity: 0.85;
  }
}
@keyframes o-poyon-shadow-loop {
  0%, 60% {
    transform: translateX(-50%) scale(1, 1);
    opacity: 0.85;
  }
  74% {
    transform: translateX(-50%) scale(1.25, 1.35);
    opacity: 1;
  }
  85% {
    transform: translateX(-50%) scale(0.65, 0.8);
    opacity: 0.35;
  }
  93% {
    transform: translateX(-50%) scale(1.08, 1.15);
    opacity: 0.9;
  }
  100% {
    transform: translateX(-50%) scale(1, 1);
    opacity: 0.85;
  }
}
@media (prefers-reduced-motion: reduce) {
  .btn.o-poyon:hover, .btn.o-poyon:focus-visible,
  .btn.o-poyon:hover::after, .btn.o-poyon:focus-visible::after,
  .btn.o-poyon.is-demo, .btn.o-poyon.is-demo::after {
    animation: none;
  }
}