Sidebar Collapse

<div class="nuda-sidebar" aria-label="Sidebar" data-collapsed="false">
  <button class="nuda-sidebar__toggle" aria-label="Toggle sidebar" aria-expanded="true">
    <span class="nuda-sidebar__toggle-icon"></span>
  </button>
  <nav class="nuda-sidebar__nav">
    <a class="nuda-sidebar__link active" href="#">
      <span class="nuda-sidebar__icon">&#9679;</span>
      <span class="nuda-sidebar__label">Home</span>
    </a>
    <a class="nuda-sidebar__link" href="#">
      <span class="nuda-sidebar__icon">&#9679;</span>
      <span class="nuda-sidebar__label">Search</span>
    </a>
    <a class="nuda-sidebar__link" href="#">
      <span class="nuda-sidebar__icon">&#9679;</span>
      <span class="nuda-sidebar__label">Settings</span>
    </a>
  </nav>
</div>

/* Sidebar Collapse
   Collapsible sidebar with smooth width transition.
   Customize: --sidebar-accent, --sidebar-width, --sidebar-width-collapsed */

.nuda-sidebar {
  --sidebar-accent: #e4ff54;
  --sidebar-width: 200px;
  --sidebar-width-collapsed: 56px;
  width: var(--sidebar-width);
  background: rgba(255, 255, 255, 0.04);
  border-radius: 12px;
  padding: 0.75rem;
  transition: width 0.3s ease;
  overflow: hidden;
  position: relative;
}

.nuda-sidebar[data-collapsed="true"] {
  width: var(--sidebar-width-collapsed);
}

.nuda-sidebar__toggle {
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
  color: #999;
  transition: color 0.2s ease;
}

.nuda-sidebar__toggle:hover {
  color: #fff;
}

.nuda-sidebar__toggle-icon {
  display: block;
  width: 14px;
  height: 2px;
  background: currentColor;
  position: relative;
}

.nuda-sidebar__toggle-icon::before,
.nuda-sidebar__toggle-icon::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  background: currentColor;
  left: 0;
}

.nuda-sidebar__toggle-icon::before { top: -5px; }
.nuda-sidebar__toggle-icon::after  { top: 5px; }

.nuda-sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nuda-sidebar__link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: #999;
  text-decoration: none;
  padding: 0.5rem;
  border-radius: 8px;
  font-size: 0.85rem;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.nuda-sidebar__link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.nuda-sidebar__link.active {
  color: var(--sidebar-accent);
  background: rgba(228, 255, 84, 0.08);
}

.nuda-sidebar__icon {
  flex-shrink: 0;
  font-size: 8px;
}

.nuda-sidebar__label {
  transition: opacity 0.3s ease;
}

.nuda-sidebar[data-collapsed="true"] .nuda-sidebar__label {
  opacity: 0;
}

@media (prefers-reduced-motion: reduce) {
  .nuda-sidebar,
  .nuda-sidebar__label {
    transition: none;
  }
}

/* Sidebar Collapse — Toggle logic */

(function () {
  var sidebar = document.querySelector('.nuda-sidebar');
  var toggle = document.querySelector('.nuda-sidebar__toggle');
  if (!sidebar || !toggle) return;

  toggle.addEventListener('click', function () {
    var isCollapsed = sidebar.getAttribute('data-collapsed') === 'true';
    sidebar.setAttribute('data-collapsed', String(!isCollapsed));
    toggle.setAttribute('aria-expanded', String(isCollapsed));
  });
})();