Mobile Tab Bar

<nav class="nuda-tabbar" aria-label="Primary">
  <button type="button" class="nuda-tabbar__btn nuda-tabbar__btn--active" aria-current="page">
    <svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" stroke-width="2"><path d="M3 11l9-8 9 8v10a1 1 0 0 1-1 1h-5v-6h-6v6H4a1 1 0 0 1-1-1z"/></svg>
    <span>Home</span>
  </button>
  <button type="button" class="nuda-tabbar__btn">
    <svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" stroke-width="2"><circle cx="11" cy="11" r="7"/><path d="M21 21l-4.3-4.3"/></svg>
    <span>Search</span>
  </button>
  <button type="button" class="nuda-tabbar__btn">
    <svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" stroke-width="2"><path d="M20.8 4.6a5.5 5.5 0 0 0-7.8 0L12 5.6l-1-1a5.5 5.5 0 0 0-7.8 7.8l1 1L12 21l7.8-7.6 1-1a5.5 5.5 0 0 0 0-7.8z"/></svg>
    <span>Saved</span>
  </button>
  <button type="button" class="nuda-tabbar__btn">
    <svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="8" r="4"/><path d="M4 21a8 8 0 0 1 16 0"/></svg>
    <span>Profile</span>
  </button>
</nav>

/* Mobile Tab Bar
   Glass tab bar with active dot indicator.
   Customize: --tabbar-accent, --tabbar-bg */

.nuda-tabbar {
  --tabbar-accent: #e4ff54;
  --tabbar-bg: rgba(12, 12, 16, 0.85);
  display: flex;
  align-items: stretch;
  justify-content: space-around;
  gap: 4px;
  width: 280px;
  padding: 8px 6px;
  background: var(--tabbar-bg);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 18px;
  font-family: system-ui;
}

.nuda-tabbar__btn {
  position: relative;
  appearance: none;
  flex: 1;
  background: transparent;
  border: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: #63636e;
  font: 600 9.5px/1 system-ui;
  min-height: 44px;
  padding: 6px 4px;
  cursor: pointer;
  transition: color 0.2s;
}

.nuda-tabbar__btn:hover { color: #a0a0a8; }
.nuda-tabbar__btn--active { color: var(--tabbar-accent); }

.nuda-tabbar__btn--active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--tabbar-accent);
  transform: translateX(-50%);
  animation: nuda-tabbar-dot 0.35s cubic-bezier(0.22, 1, 0.36, 1) both;
  box-shadow: 0 0 8px var(--tabbar-accent);
}

@keyframes nuda-tabbar-dot {
  from { transform: translateX(-50%) scale(0); opacity: 0; }
  to { transform: translateX(-50%) scale(1); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .nuda-tabbar__btn--active::after { animation: none; }
}