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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.card {
  position: relative;
  box-sizing: border-box;
  width: clamp(180px, 56vmin, 260px);
  padding: 24px 20px;
  border-radius: 16px;
  border: 1px solid rgba(57, 255, 136, 0.5);
  background: rgba(255, 255, 255, 0.04);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #39ff88;
  box-shadow: 0 0 8px #39ff88;
}

.bar {
  display: block;
  height: 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.18);
}

.bar--lg {
  width: 70%;
}

.bar--sm {
  width: 45%;
}

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

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 0 rgba(57, 255, 136, 0), 0 0 8px rgba(57, 255, 136, 0.18);
    border-color: rgba(57, 255, 136, 0.35);
  }
  50% {
    box-shadow: 0 0 4px rgba(57, 255, 136, 0.7), 0 0 32px rgba(57, 255, 136, 0.55), 0 0 48px rgba(57, 255, 136, 0.22);
    border-color: rgba(57, 255, 136, 0.9);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .card {
    animation: none;
    box-shadow: 0 0 8px rgba(57, 255, 136, 0.4);
  }
}