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);
}

.iconbtn {
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  width: clamp(52px, 14vw, 64px);
  height: clamp(52px, 14vw, 64px);
  display: grid;
  place-items: center;
  background: rgba(23, 20, 26, 0.06);
  color: #17141a;
  -webkit-tap-highlight-color: transparent;
}

.iconbtn:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 3px;
}

.bell {
  transform-box: fill-box;
  transform-origin: 50% 0%;
}

.badge-dot {
  fill: #2f6df6;
  transform-box: fill-box;
  transform-origin: 50% 50%;
}

.iconbtn.is-demo .bell {
  animation: shake 2s ease-out infinite;
}

.iconbtn.is-demo .badge-dot {
  animation: pulse 2s ease-out infinite;
}

@keyframes shake {
  0%, 30%, 100% {
    transform: rotate(0);
  }
  4% {
    transform: rotate(8deg);
  }
  8% {
    transform: rotate(-8deg);
  }
  12% {
    transform: rotate(6deg);
  }
  16% {
    transform: rotate(-6deg);
  }
  20% {
    transform: rotate(3deg);
  }
  24% {
    transform: rotate(-3deg);
  }
}
@keyframes pulse {
  0%, 30%, 100% {
    transform: scale(1);
  }
  10% {
    transform: scale(1.3);
  }
  20% {
    transform: scale(1.1);
  }
}
.ring {
  pointer-events: none;
}

.ring__orbit {
  stroke: #2f6df6;
  stroke-width: 1.2;
  stroke-linecap: round;
  stroke-dasharray: 100;
  opacity: 0;
  transition: opacity 240ms ease-out;
  filter: drop-shadow(0 0 1px #2f6df6);
}

.ring__spark {
  fill: #2f6df6;
  opacity: 0;
  transform: scale(1.5);
  transform-origin: center;
  transform-box: fill-box;
  filter: drop-shadow(0 0 1px #2f6df6);
}

.ring__bit {
  fill: #2f6df6;
  opacity: 0;
  animation: bit-fly 420ms ease-out forwards;
}

@keyframes bit-fly {
  0% {
    opacity: 0.9;
    transform: translate(0, 0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(var(--dx), var(--dy)) scale(0.3);
  }
}
@media (prefers-reduced-motion: reduce) {
  .iconbtn.is-demo .bell, .iconbtn.is-demo .badge-dot {
    animation: none;
  }
  .ring {
    display: none;
  }
}