Success-morph button

<!--
  ============================================================
  SVGarden — https://www.svgarden.dev
  Author : Simon-Pierre Boucher
  Contact: contact@spboucher.ai
  File   : snippets/buttons/btn-success-morph.html
  Desc   : Click morphs the button into a spinner, then a success check
  ============================================================
-->
<button class="sg-btn-success-morph" type="button" data-state="idle" style="--sg-color:#7F77DD; --sg-success:#2BA05A; --sg-size:16px;">
  <span class="sg-btn-success-morph-label">Save changes</span>
  <svg viewBox="0 0 28 28" aria-hidden="true" focusable="false">
    <circle class="sg-btn-success-morph-arc" cx="14" cy="14" r="10" pathLength="100" />
    <path class="sg-btn-success-morph-check" d="M8 14.5 L12.5 19 L20 9.5" pathLength="100" />
  </svg>
</button>
<script>
  document.querySelectorAll('.sg-btn-success-morph:not([data-sg-init])').forEach(function (btn) {
    btn.setAttribute('data-sg-init', '');
    btn.addEventListener('click', function () {
      var state = btn.getAttribute('data-state');
      if (state === 'idle') {
        btn.setAttribute('data-state', 'loading');
        setTimeout(function () { btn.setAttribute('data-state', 'done'); }, 1400);
      } else if (state === 'done') {
        btn.setAttribute('data-state', 'idle');
      }
    });
  });
</script>
<style>
  .sg-btn-success-morph {
    appearance: none;
    border: 0;
    font: inherit;
    font-size: var(--sg-size);
    font-weight: 600;
    color: #ffffff;
    background: var(--sg-color);
    height: 3em;
    max-width: 12em;
    padding: 0 1.8em;
    border-radius: 1.5em;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    transition: max-width 0.45s cubic-bezier(0.6, 0, 0.3, 1), padding 0.45s ease, background 0.4s ease;
  }
  .sg-btn-success-morph-label {
    transition: opacity 0.2s ease;
  }
  .sg-btn-success-morph svg {
    position: absolute;
    inset: 0;
    margin: auto;
    width: 1.9em;
    height: 1.9em;
  }
  .sg-btn-success-morph-arc,
  .sg-btn-success-morph-check {
    fill: none;
    stroke: #ffffff;
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
  }
  .sg-btn-success-morph-arc {
    stroke-dasharray: 28 72;
    opacity: 0;
    transform-box: fill-box;
    transform-origin: center;
  }
  .sg-btn-success-morph-check {
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
  }
  .sg-btn-success-morph[data-state='loading'] {
    max-width: 3em;
    padding: 0;
    cursor: progress;
  }
  .sg-btn-success-morph[data-state='loading'] .sg-btn-success-morph-label,
  .sg-btn-success-morph[data-state='done'] .sg-btn-success-morph-label {
    opacity: 0;
  }
  .sg-btn-success-morph[data-state='loading'] .sg-btn-success-morph-arc {
    opacity: 1;
    animation: sg-btn-success-morph-spin 0.8s linear infinite;
  }
  .sg-btn-success-morph[data-state='done'] {
    max-width: 3em;
    padding: 0;
    background: var(--sg-success);
  }
  .sg-btn-success-morph[data-state='done'] .sg-btn-success-morph-check {
    animation: sg-btn-success-morph-draw 0.45s ease-out 0.1s forwards;
  }
  @keyframes sg-btn-success-morph-spin {
    to { transform: rotate(360deg); }
  }
  @keyframes sg-btn-success-morph-draw {
    to { stroke-dashoffset: 0; }
  }
</style>