<nav class="bc-21" aria-label="Breadcrumb">
  <ol class="bc-21__list">
    <li class="bc-21__item"><a class="bc-21__link" href="javascript:void(0)">Home</a></li>
    <li class="bc-21__item"><a class="bc-21__link" href="javascript:void(0)">Library</a></li>
    <li class="bc-21__item">
      <a class="bc-21__link bc-21__link--cur" aria-current="page" href="javascript:void(0)"
        >Collections</a
      >
    </li>
  </ol>
</nav>

.bc-21__list {
  display: flex;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
}

.bc-21__item + .bc-21__item::before {
  content: "›";
  padding: 0 10px;
  color: rgba(255, 255, 255, 0.2);
  font-size: 18px;
}

.bc-21__link {
  position: relative;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.45);
  text-decoration: none;
  padding-bottom: 6px;
  transition: color 0.25s;
}

.bc-21__link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 4'%3E%3Cpath d='M0 2 Q5 0 10 2 Q15 4 20 2' fill='none' stroke='%238b7fff' stroke-width='1.5'/%3E%3C/svg%3E");
  background-size: 20px 4px;
  background-repeat: repeat-x;
  opacity: 0;
  transform: translateY(4px);
  transition:
    opacity 0.3s,
    transform 0.3s;
  animation: bc21wave 1.2s linear infinite paused;
}

.bc-21__link:hover::after,
.bc-21__link--cur::after {
  opacity: 1;
  transform: translateY(0);
  animation-play-state: running;
}

@keyframes bc21wave {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 20px 0;
  }
}

.bc-21__link:hover {
  color: rgba(255, 255, 255, 0.85);
}

.bc-21__link--cur {
  color: #8b7fff;
  pointer-events: none;
}