Voice Input Waveform

<!-- Voice Input Waveform — recording mic button with live waveform -->
<div class="nuda-ac2-voice">
  <button class="nuda-ac2-voice__btn nuda-ac2-voice__btn--active" aria-label="Stop recording" aria-pressed="true" type="button">
    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"
         stroke-linecap="round" stroke-linejoin="round">
      <rect x="9" y="2" width="6" height="12" rx="3" />
      <path d="M5 11 A 7 7 0 0 0 19 11 M12 18 L12 22 M8 22 L16 22" />
    </svg>
  </button>
  <span class="nuda-ac2-voice__wave" aria-hidden="true">
    <i></i><i></i><i></i><i></i><i></i>
  </span>
  <span class="nuda-ac2-voice__time">0:07</span>
</div>

.nuda-ac2-voice {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px 8px 8px;
  background: #141414;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 999px;
  font: 12px ui-sans-serif,system-ui,sans-serif;
}

.nuda-ac2-voice__btn {
  position: relative;
  width: 44px;
  height: 44px;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #e4ff54;
  color: #0a0a0a;
  border: none;
  border-radius: 50%;
  cursor: pointer;
}

.nuda-ac2-voice__btn svg {
  width: 18px;
  height: 18px;
  position: relative;
  z-index: 1;
}

.nuda-ac2-voice__btn--active::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1.5px solid #ef4444;
  animation: _nuda-ac2voicering 1.6s ease-out infinite;
}

.nuda-ac2-voice__wave {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  height: 18px;
}

.nuda-ac2-voice__wave i {
  width: 3px;
  height: 14px;
  background: #e4ff54;
  border-radius: 2px;
  display: inline-block;
  transform-origin: center;
  animation: _nuda-ac2voice 1s ease-in-out infinite;
}

.nuda-ac2-voice__wave i:nth-child(1) {
  animation-delay: 0s;
}

.nuda-ac2-voice__wave i:nth-child(2) {
  animation-delay: .12s;
}

.nuda-ac2-voice__wave i:nth-child(3) {
  animation-delay: .24s;
}

.nuda-ac2-voice__wave i:nth-child(4) {
  animation-delay: .36s;
}

.nuda-ac2-voice__wave i:nth-child(5) {
  animation-delay: .48s;
}

.nuda-ac2-voice__time {
  color: #a1a1aa;
  font-variant-numeric: tabular-nums;
  font-size: 11px;
}

@keyframes _nuda-ac2voicering {
  0% {
    transform: scale(.8);
    opacity: .8;
  }
  100% {
    transform: scale(1.4);
    opacity: 0;
  }
}

@keyframes _nuda-ac2voice {
  0%,100% {
    transform: scaleY(.3);
  }
  50% {
    transform: scaleY(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .nuda-ac2-voice__btn--active::after {
    animation: none !important;
    opacity: .5;
  }
  .nuda-ac2-voice__wave i {
    animation: none !important;
    transform: scaleY(.7);
  }
}