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);
}

.gn-nav {
  position: relative;
  box-sizing: border-box;
  width: min(272px, 86vw);
  display: flex;
  gap: 8px;
  padding: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.gn-link {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  box-sizing: border-box;
  width: 76px;
  text-align: center;
  padding: 8px 0;
  border-radius: 999px;
  font: 600 12px/1 -apple-system, "Segoe UI", sans-serif;
  color: #17141a;
  text-decoration: none;
}

.gn-pill {
  position: absolute;
  top: 8px;
  left: 8px;
  bottom: 8px;
  box-sizing: border-box;
  width: 76px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(6px);
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  transform: translateX(0);
  transition: transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.gn-nav:has(.gn-link:nth-child(3):hover) .gn-pill {
  transform: translateX(calc(76px + 8px));
}

.gn-nav:has(.gn-link:nth-child(4):hover) .gn-pill {
  transform: translateX(calc((76px + 8px) * 2));
}

@keyframes gn-loop {
  0%, 15% {
    transform: translateX(0);
  }
  33%, 48% {
    transform: translateX(calc(76px + 8px));
  }
  66%, 81% {
    transform: translateX(calc((76px + 8px) * 2));
  }
  100% {
    transform: translateX(0);
  }
}
.gn-nav.is-demo .gn-pill {
  animation: gn-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .gn-pill {
    transition: none;
  }
  .gn-nav.is-demo .gn-pill {
    animation: none !important;
  }
}