Ripple Click

<!-- Ripple Click — material-style ripple on click -->
<button class="nuda-ripple">Ripple Click</button>

/* ── Ripple Click ────────────────────────────────────────────
   Customize:
     --nuda-rp-bg      : button background
     --nuda-rp-clr     : text color
     --nuda-rp-ripple  : ripple color (use semi-transparent)
     --nuda-rp-speed   : ripple expand duration
   ──────────────────────────────────────────────────────────── */
.nuda-ripple {
  --nuda-rp-bg: #6366f1;
  --nuda-rp-clr: #fff;
  --nuda-rp-ripple: rgba(255, 255, 255, 0.4);
  --nuda-rp-speed: 0.6s;

  position: relative;
  overflow: hidden;
  padding: 12px 32px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--nuda-rp-clr);
  background: var(--nuda-rp-bg);
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

.nuda-ripple__circle {
  position: absolute;
  border-radius: 50%;
  background: var(--nuda-rp-ripple);
  width: 40px;
  height: 40px;
  margin-top: -20px;
  margin-left: -20px;
  transform: scale(0);
  animation: nuda-ripple-expand var(--nuda-rp-speed) ease-out forwards;
  pointer-events: none;
}

@keyframes nuda-ripple-expand {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* ── Accessibility ──────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .nuda-ripple__circle {
    animation: none;
    display: none;
  }
}

/* ── Ripple Click — vanilla JS ───────────────────────────────
   Creates a ripple span at the click position.
   Respects prefers-reduced-motion.
   ──────────────────────────────────────────────────────────── */
;(function () {
  if (window.matchMedia("(prefers-reduced-motion: reduce)").matches) return;

  document.querySelectorAll(".nuda-ripple").forEach(function (btn) {
    btn.addEventListener("click", function (e) {
      var rect = btn.getBoundingClientRect();
      var circle = document.createElement("span");
      circle.classList.add("nuda-ripple__circle");
      circle.style.left = (e.clientX - rect.left) + "px";
      circle.style.top  = (e.clientY - rect.top) + "px";
      btn.appendChild(circle);

      circle.addEventListener("animationend", function () {
        circle.remove();
      });
    });
  });
})();