Mobile Bottom Nav

<nav class="nuda-bnav">
  <button class="nuda-bnav__btn is-active">
    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor"
         stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
      <path d="M3 11l9-8 9 8v10a2 2 0 01-2 2h-4v-7H9v7H5a2 2 0 01-2-2V11z" />
    </svg>
    <span>Home</span>
  </button>
  <!-- More nav items -->
</nav>

.nuda-bnav {
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 8px 6px;
  background: rgba(17,17,20,.85);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 18px;
  width: 100%;
  max-width: 280px;
}

.nuda-bnav__btn {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 12px;
  background: transparent;
  border: 0;
  color: #63636e;
  font-size: 9px;
  cursor: pointer;
  border-radius: 10px;
  transition: color .25s;
}

.nuda-bnav__btn svg {
  width: 18px;
  height: 18px;
  transition: transform .35s cubic-bezier(.16,1,.3,1);
}

.nuda-bnav__btn:hover {
  color: #a0a0a8;
}

.nuda-bnav__btn.is-active {
  color: #e4ff54;
}

.nuda-bnav__btn.is-active svg {
  transform: translateY(-3px) scale(1.12);
}

.nuda-bnav__btn.is-active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 18px;
  height: 3px;
  border-radius: 99px;
  background: #e4ff54;
  animation: _bnavSlide .35s cubic-bezier(.16,1,.3,1);
}

@keyframes _bnavSlide {
  from {
    width: 0;
  }
  to {
    width: 18px;
  }
}

@media (prefers-reduced-motion:reduce) {
  .nuda-bnav__btn.is-active svg {
    transform: none;
  }
  .nuda-bnav__btn.is-active::after {
    animation: none;
  }
}