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

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

.sk {
  width: min(380px, 88vw);
}

.sk__scroller {
  height: clamp(160px, 66vh, 232px);
  overflow-y: auto;
  padding: 8px 16px 12px;
  box-sizing: border-box;
  scrollbar-width: none;
}
.sk__scroller::-webkit-scrollbar {
  display: none;
}

.sk__card {
  position: sticky;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 40px;
  margin-bottom: 8px;
  padding: 8px 16px;
  border-radius: 16px;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  box-sizing: border-box;
}
.sk__card:last-child {
  margin-bottom: 0;
}

.sk__card--1 {
  top: 8px;
  background: #ffd6e8;
}

.sk__card--2 {
  top: 16px;
  background: #d3ecff;
}

.sk__card--3 {
  top: 24px;
  background: #e4f7d9;
}

.sk__card--4 {
  top: 32px;
  background: #fff3c9;
}

.sk__step {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #17141a;
  color: #fff7e6;
  font: 700 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.sk__label {
  color: #3c4750;
  font: 700 14px/1.4 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.sk__card--2.is-demo {
  animation: sk-in-2 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.sk__card--3.is-demo {
  animation: sk-in-3 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.sk__card--4.is-demo {
  animation: sk-in-4 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes sk-in-2 {
  0%, 10% {
    transform: translateY(30px);
  }
  28%, 100% {
    transform: translateY(0);
  }
}
@keyframes sk-in-3 {
  0%, 36% {
    transform: translateY(30px);
  }
  54%, 100% {
    transform: translateY(0);
  }
}
@keyframes sk-in-4 {
  0%, 62% {
    transform: translateY(30px);
  }
  80%, 100% {
    transform: translateY(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .sk__card.is-demo {
    animation: none !important;
    transform: none !important;
  }
  .sk__scroller {
    scroll-behavior: auto;
  }
}