Apple Liquid Glass Navigation

<!-- SVG Filter for Glass Distortion -->
<svg style="display: none">
  <filter id="glass-distortion">
    <feTurbulence type="turbulence" baseFrequency="0.008" numOctaves="2" result="noise" />
    <feDisplacementMap in="SourceGraphic" in2="noise" scale="77" />
  </filter>
</svg>

<nav class="glass-nav">
  <div class="glass-filter"></div>
  <div class="glass-overlay"></div>
  <div class="glass-specular"></div>
  <div class="glass-content">
    <ul class="nav-list">
      <li><a href="#" class="nav-item active">Home</a></li>
      <li><a href="#" class="nav-item">About</a></li>
      <li><a href="#" class="nav-item">Services</a></li>
      <li><a href="#" class="nav-item">Contact</a></li>
    </ul>
  </div>
</nav>

/* Glass Navigation Container */
.glass-nav {
  --bg-color: rgba(255, 255, 255, 0.25);
  --highlight: rgba(255, 255, 255, 0.75);
  --text: #ffffff;
  
  position: relative;
  width: 100%;
  max-width: 600px;
  border-radius: 12px;
  overflow: hidden;
  background: transparent;
}

.glass-filter,
.glass-overlay,
.glass-specular {
  position: absolute;
  inset: 0;
  border-radius: inherit;
}

.glass-filter {
  z-index: 1;
  backdrop-filter: blur(4px);
  filter: url(#glass-distortion) saturate(120%) brightness(1.15);
}

.glass-overlay {
  z-index: 2;
  background: var(--bg-color);
}

.glass-specular {
  z-index: 3;
  box-shadow: inset 1px 1px 1px var(--highlight);
}

.glass-content {
  position: relative;
  z-index: 4;
  padding: 16px;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  gap: 24px;
}

.nav-item {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 16px;
  padding: 8px 16px;
  border-radius: 8px;
  transition: background-color 0.2s ease;
}

.nav-item:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-item.active {
  background-color: rgba(255, 255, 255, 0.2);
}

/* Dark mode styles */
@media (prefers-color-scheme: dark) {
  .glass-nav {
    --bg-color: rgba(0, 0, 0, 0.25);
    --highlight: rgba(255, 255, 255, 0.15);
  }
}

document.addEventListener('DOMContentLoaded', function() {

 // Add nav item click handler
  const navItems = document.querySelectorAll('.nav-item');
  navItems.forEach(item => {
    item.addEventListener('click', function(e) {
      e.preventDefault();
      navItems.forEach(navItem => navItem.classList.remove('active'));
      this.classList.add('active');
    });
  });
});