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);
}

.stage {
  position: relative;
}

.page {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  gap: clamp(8px, 3vmin, 14px);
}

.page__line {
  height: clamp(8px, 3vmin, 12px);
  border-radius: 12px;
  background: rgba(23, 20, 26, 0.12);
}
.page__line--a {
  width: 55%;
}
.page__line--b {
  width: 40%;
}
.page__line--c {
  width: 62%;
}

.trigger {
  border: 0;
  border-radius: 999px;
  margin-top: clamp(8px, 3vmin, 14px);
  padding: clamp(10px, 3.4vmin, 14px) clamp(20px, 7vmin, 30px);
  font-weight: 600;
  font-size: clamp(13px, 4vmin, 16px);
  line-height: 1;
  font-family: inherit;
  color: #ffffff;
  background: #2f6df6;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(23, 20, 26, 0.28);
  backdrop-filter: blur(0px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 600ms ease-out, backdrop-filter 600ms ease-out;
}

.modal {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) scale(0.94);
  opacity: 0;
  pointer-events: none;
  width: min(78vw, 300px);
  padding: clamp(12px, 4.5vmin, 22px);
  border-radius: 16px;
  background: #ffffff;
  color: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  transition: opacity 600ms ease-out, transform 600ms ease-out;
}
.modal h2 {
  margin: 0 0 6px;
  font-size: clamp(13px, 4.4vmin, 18px);
}
.modal p {
  margin: 0 0 14px;
  font-size: clamp(10px, 3.2vmin, 13px);
  color: rgba(23, 20, 26, 0.65);
}

.modal__close {
  border: 0;
  border-radius: 12px;
  background: #2f6df6;
  color: #ffffff;
  padding: clamp(7px, 2.6vmin, 9px) clamp(14px, 4.6vmin, 18px);
  font-weight: 600;
  font-size: clamp(11px, 3.4vmin, 13px);
  line-height: 1;
  font-family: inherit;
  cursor: pointer;
}

.stage.is-open .overlay {
  opacity: 1;
  backdrop-filter: blur(8px);
  pointer-events: auto;
}

.stage.is-open .modal {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  pointer-events: auto;
}

.stage.is-demo .overlay {
  animation: overlay-loop 2s ease-in-out infinite;
}

.stage.is-demo .modal {
  animation: modal-loop 2s ease-out infinite;
}

@keyframes overlay-loop {
  0% {
    opacity: 0;
    backdrop-filter: blur(0px);
  }
  15% {
    opacity: 1;
    backdrop-filter: blur(8px);
  }
  70% {
    opacity: 1;
    backdrop-filter: blur(8px);
  }
  85% {
    opacity: 0;
    backdrop-filter: blur(0px);
  }
  100% {
    opacity: 0;
    backdrop-filter: blur(0px);
  }
}
@keyframes modal-loop {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.94);
  }
  15% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  70% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  85% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.94);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.94);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .overlay, .stage.is-demo .modal {
    animation: none;
  }
  .overlay, .modal {
    transition-duration: 1ms;
  }
}