Dropdown Truncation Breadcrumb

<nav aria-label="Breadcrumb" class="nuda-bc2-dropdown">
  <ol class="nuda-bc2-dropdown__list">
    <li class="nuda-bc2-dropdown__item"><a class="nuda-bc2-dropdown__link" href="#">Home</a></li>
    <li class="nuda-bc2-dropdown__sep" aria-hidden="true">/</li>
    <li class="nuda-bc2-dropdown__item nuda-bc2-dropdown__item--trunc">
      <button type="button" class="nuda-bc2-dropdown__trigger" aria-haspopup="true" aria-expanded="false">…</button>
      <ul class="nuda-bc2-dropdown__menu">
        <li><a class="nuda-bc2-dropdown__menulink" href="#">Library</a></li>
        <li><a class="nuda-bc2-dropdown__menulink" href="#">2024</a></li>
      </ul>
    </li>
    <li class="nuda-bc2-dropdown__sep" aria-hidden="true">/</li>
    <li class="nuda-bc2-dropdown__item"><span class="nuda-bc2-dropdown__link nuda-bc2-dropdown__link--cur" aria-current="page">Report</span></li>
  </ol>
</nav>

.nuda-bc2-dropdown {
  width: 260px;
  font-size: .8rem;
}

.nuda-bc2-dropdown__list {
  display: flex;
  align-items: center;
  gap: .3rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nuda-bc2-dropdown__item {
  position: relative;
}

.nuda-bc2-dropdown__item--trunc {
  display: flex;
  align-items: center;
}

.nuda-bc2-dropdown__link {
  color: #999;
  text-decoration: none;
}

.nuda-bc2-dropdown__link:hover {
  color: #e4ff54;
}

.nuda-bc2-dropdown__link--cur {
  color: #fafafa;
  font-weight: 600;
}

.nuda-bc2-dropdown__sep {
  color: #444;
}

.nuda-bc2-dropdown__trigger {
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: #999;
  font-size: 1rem;
  cursor: pointer;
  border-radius: 6px;
  line-height: 1;
}

.nuda-bc2-dropdown__trigger:hover {
  background: #1c1c1c;
  color: #fafafa;
}

.nuda-bc2-dropdown__trigger:focus-visible {
  outline: 2px solid #e4ff54;
  outline-offset: 2px;
}

.nuda-bc2-dropdown__menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 130px;
  background: #161616;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 8px;
  padding: .3rem;
  margin: 0;
  list-style: none;
  box-shadow: 0 12px 28px rgba(0,0,0,.45);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px) scale(.96);
  transform-origin: top left;
  z-index: 5;
}

.nuda-bc2-dropdown__item--trunc:hover .nuda-bc2-dropdown__menu,.nuda-bc2-dropdown__item--trunc:focus-within .nuda-bc2-dropdown__menu {
  opacity: 1;
  pointer-events: auto;
  animation: _nuda-bc2dropdownin .18s ease forwards;
}

.nuda-bc2-dropdown__menulink {
  display: block;
  padding: .35rem .5rem;
  color: #ccc;
  text-decoration: none;
  border-radius: 5px;
  font-size: .76rem;
}

.nuda-bc2-dropdown__menulink:hover {
  background: #232323;
  color: #e4ff54;
}

@keyframes _nuda-bc2dropdownin {
  from {
    opacity: 0;
    transform: translateY(-6px) scale(.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (prefers-reduced-motion:reduce) {
  .nuda-bc2-dropdown__item--trunc:hover .nuda-bc2-dropdown__menu,.nuda-bc2-dropdown__item--trunc:focus-within .nuda-bc2-dropdown__menu {
    animation: none !important;
    opacity: 1;
    transform: none;
  }
}