Multi-Level Dropdown Menu

.dropdown-demo {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 370px;
  border-radius: 16px;
  padding: 30px;
  color: white;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.demo-content {
  text-align: center;
  margin-bottom: 30px;
}

.demo-content h2 {
  margin: 0 0 12px 0;
  font-size: 24px;
  font-weight: 700;
}

.demo-content p {
  margin: 0 0 20px 0;
  opacity: 0.9;
  line-height: 1.6;
}

.demo-controls h3 {
  margin: 0 0 12px 0;
  font-size: 16px;
  font-weight: 600;
}

.control-buttons {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.control-btn {
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 6px;
  color: white;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.control-btn:hover,
.control-btn.active {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

.dropdown-container {
  background: white;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.dropdown-nav {
  margin-bottom: 20px;
}

.dropdown-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  background: #f8f9fa;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.dropdown-item {
  position: relative;
}

.dropdown-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 20px;
  text-decoration: none;
  color: #4a5568;
  font-weight: 500;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.dropdown-link:hover {
  background: #e2e8f0;
  color: #2d3748;
}

.dropdown-arrow {
  font-size: 12px;
  transition: transform 0.3s ease;
}

.dropdown-item.active > .dropdown-link .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-submenu {
  list-style: none;
  margin: 0;
  padding: 8px 0;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  z-index: 1000;
}

.dropdown-submenu.level-2 {
  top: 0;
  left: 100%;
  margin-left: 8px;
}

.dropdown-item.active > .dropdown-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-subitem {
  position: relative;
}

.dropdown-sublink {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  text-decoration: none;
  color: #4a5568;
  font-size: 14px;
  transition: all 0.3s ease;
}

.dropdown-sublink:hover {
  background: #f7fafc;
  color: #2d3748;
  padding-left: 24px;
}

.dropdown-subitem.active > .dropdown-sublink {
  background: #ebf8ff;
  color: #3182ce;
}

.dropdown-subitem .dropdown-arrow {
  font-size: 10px;
  opacity: 0.7;
}

.dropdown-info {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 16px;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.info-label {
  font-size: 12px;
  opacity: 0.8;
  font-weight: 500;
}

.info-value {
  font-size: 14px;
  font-weight: 600;
}

/* Hover effects */
.dropdown-item:hover > .dropdown-link {
  background: #e2e8f0;
}

.dropdown-item:hover > .dropdown-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-subitem:hover > .dropdown-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Click mode styles */
.dropdown-nav.click-mode .dropdown-item:hover > .dropdown-submenu {
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
}

.dropdown-nav.click-mode .dropdown-subitem:hover > .dropdown-submenu {
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
}

/* Active states for click mode */
.dropdown-nav.click-mode .dropdown-item.active > .dropdown-submenu,
.dropdown-nav.click-mode .dropdown-subitem.active > .dropdown-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Mixed mode - first level click, second level hover */
.dropdown-nav.mixed-mode .dropdown-item:hover > .dropdown-submenu {
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
}

.dropdown-nav.mixed-mode .dropdown-item.active > .dropdown-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-nav.mixed-mode .dropdown-subitem:hover > .dropdown-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Responsive design */
@media (max-width: 768px) {
  .dropdown-demo {
    padding: 20px;
  }
  
  .dropdown-menu {
    flex-direction: column;
  }
  
  .dropdown-submenu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: #f7fafc;
    margin: 8px 0;
    border-radius: 6px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  
  .dropdown-submenu.level-2 {
    margin-left: 20px;
  }
  
  .dropdown-item.active > .dropdown-submenu {
    max-height: 300px;
  }
  
  .dropdown-sublink:hover {
    padding-left: 20px;
  }
  
  .control-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .control-btn {
    width: 120px;
  }
  
  .dropdown-info {
    flex-direction: column;
    gap: 12px;
  }
}

/* Focus styles for accessibility */
.dropdown-link:focus,
.dropdown-sublink:focus,
.control-btn:focus {
  outline: 2px solid #3182ce;
  outline-offset: 2px;
}

/* Animation for menu items */
.dropdown-subitem {
  animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Loading state */
.dropdown-nav.loading {
  opacity: 0.6;
  pointer-events: none;
}

/* Highlight active path */
.dropdown-item.in-path > .dropdown-link,
.dropdown-subitem.in-path > .dropdown-sublink {
  background: #e6fffa;
  color: #319795;
}

document.addEventListener('DOMContentLoaded', function() {
  const dropdownNav = document.querySelector('.dropdown-nav');
  const mainMenu = document.getElementById('mainMenu');
  const controlButtons = document.querySelectorAll('.control-btn');
  const currentMode = document.getElementById('currentMode');
  const activeItem = document.getElementById('activeItem');
  const menuLevel = document.getElementById('menuLevel');
  
  let interactionMode = 'hover';
  let activeMenus = [];
  
  // Initialize dropdown functionality
  function initDropdown() {
    const dropdownItems = document.querySelectorAll('.dropdown-item, .dropdown-subitem');
    
    dropdownItems.forEach(item => {
      const link = item.querySelector('.dropdown-link, .dropdown-sublink');
      const submenu = item.querySelector('.dropdown-submenu');
      
      if (submenu) {
        // Add click handlers
        link.addEventListener('click', function(e) {
          e.preventDefault();
          
          if (interactionMode === 'click' || 
              (interactionMode === 'mixed' && item.classList.contains('dropdown-item'))) {
            toggleSubmenu(item);
          }
          
          updateActiveInfo(link.textContent.trim());
        });
        
        // Add hover handlers
        if (interactionMode === 'hover' || 
            (interactionMode === 'mixed' && item.classList.contains('dropdown-subitem'))) {
          item.addEventListener('mouseenter', function() {
            if (interactionMode === 'hover' || 
                (interactionMode === 'mixed' && item.classList.contains('dropdown-subitem'))) {
              openSubmenu(item);
            }
          });
          
          item.addEventListener('mouseleave', function() {
            if (interactionMode === 'hover' || 
                (interactionMode === 'mixed' && item.classList.contains('dropdown-subitem'))) {
              closeSubmenu(item);
            }
          });
        }
      } else {
        // Regular menu item
        link.addEventListener('click', function(e) {
          e.preventDefault();
          updateActiveInfo(link.textContent.trim());
          showFeedback(`Navigated to: ${link.textContent.trim()}`);
        });
      }
    });
  }
  
  // Toggle submenu (for click mode)
  function toggleSubmenu(item) {
    const isActive = item.classList.contains('active');
    
    if (isActive) {
      closeSubmenu(item);
    } else {
      // Close siblings
      const siblings = item.parentElement.children;
      Array.from(siblings).forEach(sibling => {
        if (sibling !== item) {
          closeSubmenu(sibling);
        }
      });
      
      openSubmenu(item);
    }
  }
  
  // Open submenu
  function openSubmenu(item) {
    item.classList.add('active');
    const link = item.querySelector('.dropdown-link, .dropdown-sublink');
    link.setAttribute('aria-expanded', 'true');
    
    updateMenuLevel();
    updateActiveInfo(link.textContent.trim());
  }
  
  // Close submenu
  function closeSubmenu(item) {
    item.classList.remove('active');
    const link = item.querySelector('.dropdown-link, .dropdown-sublink');
    link.setAttribute('aria-expanded', 'false');
    
    // Close all child submenus
    const childItems = item.querySelectorAll('.dropdown-item, .dropdown-subitem');
    childItems.forEach(child => {
      child.classList.remove('active');
      const childLink = child.querySelector('.dropdown-link, .dropdown-sublink');
      if (childLink) {
        childLink.setAttribute('aria-expanded', 'false');
      }
    });
    
    updateMenuLevel();
  }
  
  // Update menu level indicator
  function updateMenuLevel() {
    const activeItems = document.querySelectorAll('.dropdown-item.active, .dropdown-subitem.active');
    menuLevel.textContent = activeItems.length;
  }
  
  // Update active item info
  function updateActiveInfo(itemText) {
    activeItem.textContent = itemText;
  }
  
  // Control button handlers
  controlButtons.forEach(button => {
    button.addEventListener('click', function() {
      const mode = this.getAttribute('data-mode');
      
      // Update active button
      controlButtons.forEach(btn => btn.classList.remove('active'));
      this.classList.add('active');
      
      // Update mode
      interactionMode = mode;
      currentMode.textContent = mode.charAt(0).toUpperCase() + mode.slice(1) + ' Mode';
      
      // Update nav class
      dropdownNav.className = 'dropdown-nav';
      if (mode !== 'hover') {
        dropdownNav.classList.add(mode + '-mode');
      }
      
      // Close all menus
      const activeItems = document.querySelectorAll('.dropdown-item.active, .dropdown-subitem.active');
      activeItems.forEach(item => closeSubmenu(item));
      
      // Reinitialize
      initDropdown();
      
      showFeedback(`Switched to ${mode} mode`);
    });
  });
  
  // Keyboard navigation
  document.addEventListener('keydown', function(e) {
    if (e.key === 'Escape') {
      // Close all menus
      const activeItems = document.querySelectorAll('.dropdown-item.active, .dropdown-subitem.active');
      activeItems.forEach(item => closeSubmenu(item));
      updateActiveInfo('None');
    }
  });
  
  // Click outside to close menus
  document.addEventListener('click', function(e) {
    if (!dropdownNav.contains(e.target)) {
      const activeItems = document.querySelectorAll('.dropdown-item.active, .dropdown-subitem.active');
      activeItems.forEach(item => closeSubmenu(item));
      updateActiveInfo('None');
    }
  });
  
  // Feedback function
  function showFeedback(message) {
    const existing = document.querySelector('.demo-feedback');
    if (existing) existing.remove();
    
    const feedback = document.createElement('div');
    feedback.className = 'demo-feedback';
    feedback.textContent = message;
    feedback.style.cssText = `
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
      color: white;
      padding: 12px 20px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 500;
      z-index: 10001;
      box-shadow: 0 4px 15px rgba(72, 187, 120, 0.3);
      opacity: 0;
      transition: opacity 0.3s ease;
    `;
    
    document.body.appendChild(feedback);
    
    requestAnimationFrame(() => {
      feedback.style.opacity = '1';
    });
    
    setTimeout(() => {
      feedback.style.opacity = '0';
      setTimeout(() => feedback.remove(), 300);
    }, 2500);
  }
  
  // Initialize
  initDropdown();
  updateActiveInfo('None');
  
  // Initial feedback
  setTimeout(() => {
    showFeedback('Try different interaction modes and explore the menu!');
  }, 1000);
});