fix(nav): add mobile hamburger menu to header to ensure parity with desktop

components/layout/Header.tsx

@@ -22,6 +22,7 @@ export function Header({ navLinks }: HeaderProps) {
   const [isScrolled, setIsScrolled] = React.useState(false);
   const [forceSolid, setForceSolid] = React.useState(false);
   const [headerVariant, setHeaderVariant] = React.useState<'capsule' | 'standard'>('capsule');
+  const [isMobileMenuOpen, setIsMobileMenuOpen] = React.useState(false);
   const pathname = usePathname() || '/';
 
   // Scroll bound shine effect (continuous looping as user scrolls)
@@ -55,6 +56,7 @@ export function Header({ navLinks }: HeaderProps) {
     
     // Re-check when pathname changes
     checkHeaderState();
+    setIsMobileMenuOpen(false);
     
     return () => {
       window.removeEventListener('scroll', handleScroll);
@@ -154,10 +156,82 @@ export function Header({ navLinks }: HeaderProps) {
                 {/* Sleek shine sweep effect */}
                 <span className="absolute top-0 -left-[150%] h-[200%] w-[150%] bg-gradient-to-r from-transparent via-white/30 to-transparent skew-x-[-20deg] group-hover/cta:left-[100%] transition-all duration-1000 ease-[cubic-bezier(0.16,1,0.3,1)] z-30 pointer-events-none" />
               </TransitionLink>
+
+              {/* Hamburger Menu (Mobile Only) */}
+              <button 
+                className={`md:hidden ml-2 p-2 transition-colors focus:outline-none ${isSolidMode && !isMobileMenuOpen ? 'text-text-primary hover:text-primary' : 'text-white hover:text-primary z-[60] relative'}`}
+                onClick={() => setIsMobileMenuOpen(!isMobileMenuOpen)}
+                aria-label="Toggle Menu"
+              >
+                <div className="w-6 h-5 flex flex-col justify-between relative">
+                  <span className={`w-full h-0.5 bg-current transform transition duration-300 ease-in-out ${isMobileMenuOpen ? 'rotate-45 translate-y-2' : ''}`} />
+                  <span className={`w-full h-0.5 bg-current transition duration-300 ease-in-out ${isMobileMenuOpen ? 'opacity-0' : 'opacity-100'}`} />
+                  <span className={`w-full h-0.5 bg-current transform transition duration-300 ease-in-out ${isMobileMenuOpen ? '-rotate-45 -translate-y-2.5' : ''}`} />
+                </div>
+              </button>
             </div>
           </div>
         </div>
       </header>
+
+      {/* Mobile Menu Overlay */}
+      <AnimatePresence>
+        {isMobileMenuOpen && (
+          <motion.div
+            initial={{ opacity: 0, y: -20 }}
+            animate={{ opacity: 1, y: 0 }}
+            exit={{ opacity: 0, y: -20 }}
+            transition={{ duration: 0.3 }}
+            className="fixed inset-0 z-[40] bg-[#050B14]/95 backdrop-blur-xl md:hidden pt-24 pb-24 px-6 overflow-y-auto"
+          >
+            <nav className="flex flex-col gap-6 mt-8">
+              {navLinks && navLinks.length > 0 && navLinks.map((link) => {
+                const mappedUrl = link.url.startsWith('/') && !link.url.match(/^\/(en|de)/) 
+                  ? `/${currentLocale}${link.url}` 
+                  : link.url;
+                const isActive = pathname === mappedUrl || (mappedUrl !== `/${currentLocale}` && pathname?.startsWith(`${mappedUrl}/`));
+                
+                return (
+                  <div key={link.url} className="flex flex-col">
+                    <TransitionLink 
+                      href={mappedUrl}
+                      onClick={() => setIsMobileMenuOpen(false)}
+                      className={`text-2xl font-bold uppercase tracking-widest transition-colors ${isActive ? 'text-primary' : 'text-white'}`}
+                    >
+                      {link.label}
+                    </TransitionLink>
+                    
+                    {link.children && (
+                      <div className="flex flex-col gap-3 mt-3 pl-4 border-l-2 border-white/10">
+                        {link.children.map((child, idx) => {
+                          if (child.isGroupLabel) {
+                            return <div key={idx} className="text-sm font-bold text-neutral-500 uppercase tracking-widest mt-2">{child.label}</div>;
+                          }
+                          const childUrl = child.url.startsWith('/') && !child.url.match(/^\/(en|de)/) 
+                            ? `/${currentLocale}${child.url}` 
+                            : child.url;
+                          const isChildActive = pathname === childUrl;
+                          
+                          return (
+                            <TransitionLink
+                              key={child.url}
+                              href={childUrl}
+                              onClick={() => setIsMobileMenuOpen(false)}
+                              className={`text-lg font-medium transition-colors ${isChildActive ? 'text-primary' : 'text-white/70'}`}
+                            >
+                              {child.label}
+                            </TransitionLink>
+                          );
+                        })}
+                      </div>
+                    )}
+                  </div>
+                );
+              })}
+            </nav>
+          </motion.div>
+        )}
+      </AnimatePresence>
     </>
   );
 }