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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.fv3 {
  width: min(240px, 86vw);
}

.fv3__field {
  position: relative;
  display: block;
}

.fv3__glow {
  position: absolute;
  inset: -6px;
  border-radius: 12px;
  box-shadow: 0 0 0 4px rgba(76, 212, 166, 0.55);
  opacity: 0;
  transform: scale(0.94);
  pointer-events: none;
}

.fv3__input {
  position: relative;
  box-sizing: border-box;
  width: 100%;
  padding: 8px 12px;
  border-radius: 8px;
  border: 2px solid #4cd4a6;
  background: #fff7e6;
  color: #17141a;
  font-weight: 400;
  font-size: 14px;
  line-height: 1;
  font-family: inherit;
}

@keyframes fv3-glow {
  0%, 15% {
    opacity: 0;
    transform: scale(0.94);
  }
  45% {
    opacity: 1;
    transform: scale(1.04);
  }
  48.5% {
    opacity: 0.35;
    transform: scale(0.985);
  }
  52% {
    opacity: 0.62;
    transform: scale(1.015);
  }
  55% {
    opacity: 0.18;
    transform: scale(0.985);
  }
  58% {
    opacity: 0.34;
    transform: scale(1.008);
  }
  61% {
    opacity: 0.08;
    transform: scale(0.992);
  }
  64% {
    opacity: 0.16;
    transform: scale(1.004);
  }
  68% {
    opacity: 0;
    transform: scale(0.94);
  }
  75%, 100% {
    opacity: 0;
    transform: scale(0.94);
  }
}
.fv3.is-demo .fv3__glow {
  animation: fv3-glow 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .fv3.is-demo .fv3__glow {
    animation: none !important;
    opacity: 0.6;
    transform: scale(1);
  }
}