diff --git a/assets/css/hvac-navigation-simple.css b/assets/css/hvac-navigation-simple.css
new file mode 100644
index 00000000..f1991924
--- /dev/null
+++ b/assets/css/hvac-navigation-simple.css
@@ -0,0 +1,178 @@
+/**
+ * HVAC Navigation - Simple & Robust
+ * Simplified navigation that ensures dropdowns work reliably
+ * 
+ * @version 1.0.0
+ * @since 2025-08-21
+ */
+
+/* Ensure the menu is visible when active */
+.hvac-trainer-menu.active {
+    display: block !important;
+    visibility: visible !important;
+    opacity: 1 !important;
+}
+
+/* Hamburger menu button styling */
+.hvac-hamburger-menu {
+    display: flex !important;
+    flex-direction: column;
+    justify-content: center;
+    align-items: center;
+    width: 55px;
+    height: 54px;
+    background: none;
+    border: none;
+    cursor: pointer;
+    padding: 10px;
+    position: relative;
+    z-index: 1002;
+}
+
+.hvac-hamburger-menu.active {
+    background: rgba(2, 116, 190, 0.1);
+    border-radius: 8px;
+}
+
+/* Hamburger lines */
+.hvac-hamburger-line {
+    width: 25px;
+    height: 3px;
+    background: #374151;
+    margin: 2px 0;
+    transition: all 0.3s ease;
+    display: block;
+}
+
+/* Menu toggle buttons (dropdown arrows) */
+.hvac-trainer-menu .menu-toggle {
+    display: flex !important;
+    align-items: center;
+    padding: 12px 16px !important;
+    cursor: pointer !important;
+    color: #374151;
+    font-size: 14px;
+    font-weight: 500;
+    user-select: none;
+    transition: all 0.2s ease;
+    background: none;
+    border: none;
+    width: 100%;
+    text-align: left;
+    justify-content: space-between;
+}
+
+.hvac-trainer-menu .menu-toggle:hover {
+    background: rgba(2, 116, 190, 0.05);
+    color: #0274be;
+}
+
+/* Ensure dropdown arrows are visible and clickable */
+.hvac-trainer-menu .dropdown-arrow {
+    font-size: 12px;
+    margin-left: auto;
+    color: #9ca3af;
+    transition: transform 0.3s ease;
+}
+
+.hvac-trainer-menu .menu-item.open .dropdown-arrow,
+.hvac-trainer-menu .menu-item.has-children:hover .dropdown-arrow {
+    transform: rotate(180deg);
+    color: #0274be;
+}
+
+/* Submenu styling - simple and reliable */
+.hvac-trainer-menu .sub-menu {
+    background: #f9fafb;
+    border-left: 3px solid #e5e7eb;
+    margin: 0;
+    padding: 0;
+    list-style: none;
+    
+    /* Hidden by default */
+    display: none;
+    max-height: 0;
+    overflow: hidden;
+    transition: all 0.3s ease;
+}
+
+/* Show submenu when parent is open */
+.hvac-trainer-menu .menu-item.open > .sub-menu {
+    display: block !important;
+    max-height: 500px !important;
+    padding: 8px 0 !important;
+}
+
+/* Submenu items */
+.hvac-trainer-menu .sub-menu .menu-item {
+    margin: 0;
+    padding: 0;
+}
+
+.hvac-trainer-menu .sub-menu .menu-item > a {
+    display: block;
+    padding: 10px 20px 10px 30px;
+    color: #4b5563;
+    text-decoration: none;
+    font-size: 14px;
+    transition: all 0.2s ease;
+}
+
+.hvac-trainer-menu .sub-menu .menu-item > a:hover {
+    color: #0274be;
+    background: rgba(2, 116, 190, 0.05);
+    padding-left: 35px;
+}
+
+/* Force visibility on mobile when menu is active */
+@media (max-width: 992px) {
+    .hvac-trainer-menu {
+        position: static !important;
+        box-shadow: none !important;
+        background: white;
+        padding: 0;
+        margin: 0;
+        width: 100%;
+    }
+    
+    .hvac-trainer-menu.active {
+        display: block !important;
+    }
+    
+    .hvac-trainer-menu .menu-item {
+        border-bottom: 1px solid #e5e7eb;
+    }
+    
+    .hvac-trainer-menu .sub-menu {
+        position: static !important;
+        box-shadow: none !important;
+        border: none !important;
+        background: #f8fafc !important;
+        margin-left: 0 !important;
+    }
+}
+
+/* Make sure everything is clickable */
+.hvac-trainer-menu .menu-toggle,
+.hvac-trainer-menu .menu-item > a {
+    pointer-events: auto !important;
+    cursor: pointer !important;
+}
+
+/* Override any theme conflicts */
+.hvac-plugin-page .hvac-trainer-menu,
+.hvac-page-wrapper .hvac-trainer-menu {
+    font-family: inherit !important;
+    list-style: none !important;
+}
+
+/* Ensure proper z-index stacking */
+.hvac-trainer-nav {
+    position: relative;
+    z-index: 1000;
+}
+
+.hvac-trainer-menu {
+    position: relative;
+    z-index: 1001;
+}
\ No newline at end of file
diff --git a/assets/js/hvac-navigation-robust.js b/assets/js/hvac-navigation-robust.js
new file mode 100644
index 00000000..7629c3eb
--- /dev/null
+++ b/assets/js/hvac-navigation-robust.js
@@ -0,0 +1,128 @@
+/**
+ * HVAC Navigation - Robust & Simple
+ * Ensures navigation dropdowns work reliably for all users
+ * 
+ * @version 1.0.0
+ * @since 2025-08-21
+ */
+
+jQuery(document).ready(function($) {
+    'use strict';
+    
+    console.log('HVAC Navigation: Robust navigation loading...');
+    
+    // Ensure the menu system works even if other JavaScript fails
+    function initRobustNavigation() {
+        // Find all menu toggle elements
+        const $menuToggles = $('.hvac-trainer-menu .menu-toggle');
+        
+        console.log('HVAC Navigation: Found', $menuToggles.length, 'menu toggles');
+        
+        // Add click handlers to dropdown toggles
+        $menuToggles.off('click.hvacRobust').on('click.hvacRobust', function(e) {
+            e.preventDefault();
+            e.stopPropagation();
+            
+            const $this = $(this);
+            const $menuItem = $this.closest('.menu-item');
+            const $submenu = $menuItem.find('> .sub-menu');
+            
+            console.log('HVAC Navigation: Toggle clicked for', $this.text().trim());
+            
+            // Close other open menus at the same level
+            $this.closest('ul').find('> .menu-item.open').not($menuItem).removeClass('open');
+            
+            // Toggle this menu
+            $menuItem.toggleClass('open');
+            
+            // Log the state
+            console.log('HVAC Navigation: Menu is now', $menuItem.hasClass('open') ? 'open' : 'closed');
+        });
+        
+        // Ensure hamburger menu works
+        const $hamburger = $('#hvac-hamburger-menu, .hvac-hamburger-menu');
+        const $menu = $('#hvac-trainer-menu, .hvac-trainer-menu');
+        
+        if ($hamburger.length && $menu.length) {
+            console.log('HVAC Navigation: Setting up hamburger menu');
+            
+            $hamburger.off('click.hvacRobust').on('click.hvacRobust', function(e) {
+                e.preventDefault();
+                e.stopPropagation();
+                
+                console.log('HVAC Navigation: Hamburger clicked');
+                
+                $hamburger.toggleClass('active');
+                $menu.toggleClass('active');
+                
+                // Update aria attributes
+                const isOpen = $menu.hasClass('active');
+                $hamburger.attr('aria-expanded', isOpen);
+                
+                console.log('HVAC Navigation: Menu is now', isOpen ? 'active' : 'inactive');
+            });
+        }
+        
+        // Close menu when clicking outside (on mobile)
+        $(document).off('click.hvacRobustOutside').on('click.hvacRobustOutside', function(e) {
+            if (!$(e.target).closest('.hvac-trainer-nav').length) {
+                if (window.innerWidth <= 992) {
+                    $menu.removeClass('active');
+                    $hamburger.removeClass('active');
+                    $hamburger.attr('aria-expanded', 'false');
+                }
+                
+                // Close all open dropdowns
+                $('.hvac-trainer-menu .menu-item.open').removeClass('open');
+            }
+        });
+        
+        // Handle window resize
+        $(window).off('resize.hvacRobust').on('resize.hvacRobust', function() {
+            if (window.innerWidth > 992) {
+                // Reset mobile menu state on desktop
+                $menu.removeClass('active');
+                $hamburger.removeClass('active');
+                $hamburger.attr('aria-expanded', 'false');
+            }
+        });
+        
+        console.log('HVAC Navigation: Robust navigation initialized successfully');
+    }
+    
+    // Initialize immediately
+    initRobustNavigation();
+    
+    // Reinitialize after AJAX or dynamic content changes
+    $(document).on('hvac-content-updated', initRobustNavigation);
+    
+    // Fallback initialization after a delay
+    setTimeout(function() {
+        // Check if dropdowns are working
+        const $firstToggle = $('.hvac-trainer-menu .menu-toggle').first();
+        if ($firstToggle.length) {
+            // Simulate a click to test functionality
+            const events = $._data($firstToggle[0], 'events');
+            if (!events || !events.click || events.click.length === 0) {
+                console.log('HVAC Navigation: No click handlers found, reinitializing...');
+                initRobustNavigation();
+            }
+        }
+    }, 1000);
+    
+    // Extra safety net - ensure menu visibility
+    function ensureMenuVisibility() {
+        const $activeMenu = $('.hvac-trainer-menu.active');
+        if ($activeMenu.length && $activeMenu.is(':hidden')) {
+            console.log('HVAC Navigation: Forcing menu visibility');
+            $activeMenu.css({
+                'display': 'block',
+                'visibility': 'visible',
+                'opacity': '1'
+            });
+        }
+    }
+    
+    // Check menu visibility periodically
+    setInterval(ensureMenuVisibility, 2000);
+});
\ No newline at end of file
diff --git a/includes/class-hvac-scripts-styles.php b/includes/class-hvac-scripts-styles.php
index 6a34376c..1cce9308 100644
--- a/includes/class-hvac-scripts-styles.php
+++ b/includes/class-hvac-scripts-styles.php
@@ -294,10 +294,10 @@ class HVAC_Scripts_Styles {
             $this->version
         );
         
-        // Load navigation fix with high priority
+        // Load simple navigation styles with high priority
         wp_enqueue_style(
-            'hvac-navigation-fix',
-            HVAC_PLUGIN_URL . 'assets/css/hvac-navigation-fix.css',
+            'hvac-navigation-simple',
+            HVAC_PLUGIN_URL . 'assets/css/hvac-navigation-simple.css',
             array('hvac-design-system', 'hvac-components'),
             $this->version
         );
@@ -360,6 +360,14 @@ class HVAC_Scripts_Styles {
             true
         );
         
+        // Robust navigation functionality
+        wp_enqueue_script(
+            'hvac-navigation-robust',
+            HVAC_PLUGIN_URL . 'assets/js/hvac-navigation-robust.js',
+            array('jquery'),
+            $this->version,
+            true
+        );
         
         // Mobile responsive functionality
         wp_enqueue_script(