Add-on Checklist Total

<!-- Add-on Checklist Total — checking items updates the running total -->
<div class="nuda-pr2-addon-total">
  <div class="nuda-pr2-addon-total__row">
    <label class="nuda-pr2-addon-total__label">
      <input class="nuda-pr2-addon-total__checkbox" type="checkbox" checked data-price="10" />
      Extra seats
    </label>
    <span class="nuda-pr2-addon-total__price">+$10</span>
  </div>
  <div class="nuda-pr2-addon-total__row">
    <label class="nuda-pr2-addon-total__label">
      <input class="nuda-pr2-addon-total__checkbox" type="checkbox" data-price="15" />
      Priority support
    </label>
    <span class="nuda-pr2-addon-total__price">+$15</span>
  </div>
  <div class="nuda-pr2-addon-total__row">
    <label class="nuda-pr2-addon-total__label">
      <input class="nuda-pr2-addon-total__checkbox" type="checkbox" checked data-price="8" />
      Extra storage
    </label>
    <span class="nuda-pr2-addon-total__price">+$8</span>
  </div>
  <div class="nuda-pr2-addon-total__divider"></div>
  <div class="nuda-pr2-addon-total__total">Total <b>$38</b><i>/mo</i></div>
</div>

/* Add-on Checklist Total — sums the base plan + checked add-ons. */

(function () {
  var card = document.querySelector('.nuda-pr2-addon-total');
  if (!card) return;
  var base = 20;
  var boxes = card.querySelectorAll('.nuda-pr2-addon-total__checkbox');
  var totalEl = card.querySelector('.nuda-pr2-addon-total__total');
  var totalB = totalEl.querySelector('b');

  function recalc() {
    var sum = base;
    boxes.forEach(function (b) {
      if (b.checked) sum += Number(b.dataset.price || 0);
    });
    totalB.textContent = '$' + sum;
    totalEl.classList.remove('is-updated');
    void totalEl.offsetWidth; // restart animation
    totalEl.classList.add('is-updated');
  }

  boxes.forEach(function (b) { b.addEventListener('change', recalc); });
})();

.nuda-pr2-addon-total {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  width: 190px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 12px;
}

.nuda-pr2-addon-total__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.nuda-pr2-addon-total__label {
  display: flex;
  align-items: center;
  gap: 8px;
  font: 500 10px ui-sans-serif,system-ui;
  color: #cfcfcf;
  cursor: pointer;
  min-height: 28px;
}

.nuda-pr2-addon-total__checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  border-radius: 4px;
  border: 1px solid rgba(255,255,255,.2);
  background: transparent;
  cursor: pointer;
  position: relative;
  transition: background .2s,border-color .2s,transform .2s;
}

.nuda-pr2-addon-total__checkbox:checked {
  background: #e4ff54;
  border-color: #e4ff54;
  transform: scale(1.05);
}

.nuda-pr2-addon-total__checkbox:checked::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 0;
  width: 4px;
  height: 8px;
  border: solid #09090b;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.nuda-pr2-addon-total__checkbox:focus-visible {
  outline: 2px solid #e4ff54;
  outline-offset: 2px;
}

.nuda-pr2-addon-total__price {
  font: 600 10px ui-sans-serif,system-ui;
  color: #a1a1aa;
  font-variant-numeric: tabular-nums;
}

.nuda-pr2-addon-total__divider {
  height: 1px;
  background: rgba(255,255,255,.08);
  margin: 2px 0;
}

.nuda-pr2-addon-total__total {
  font: 600 10px ui-sans-serif,system-ui;
  color: #a1a1aa;
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.nuda-pr2-addon-total__total b {
  font: 800 16px ui-sans-serif,system-ui;
  color: #fafafa;
  font-variant-numeric: tabular-nums;
}

.nuda-pr2-addon-total__total.is-updated b {
  animation: nuda-pr2-addon-total-pop .35s ease;
}

@keyframes nuda-pr2-addon-total-pop {
  0% {
    transform: scale(1.15);
    filter: drop-shadow(0 0 6px rgba(228,255,84,.6));
  }
  100% {
    transform: scale(1);
    filter: drop-shadow(0 0 0 rgba(228,255,84,0));
  }
}

@media (prefers-reduced-motion:reduce) {
  .nuda-pr2-addon-total__checkbox {
    transition: none;
  }
  .nuda-pr2-addon-total__total.is-updated b {
    animation: none !important;
  }
}