feat(mobile): optimize mobile layout, navigation, and spacing

- Implement MobileBottomNav for native thumb-optimized usage
- Simplify Header overlay on mobile
- Add dynamic max() padding to ReferencesSlider for mobile view
- Condense vertical spacing in Footer for mobile devices
- Update layout.tsx to pad main content for bottom nav

components/layout/Header.tsx

@@ -1,13 +1,11 @@
 'use client';
 
 import * as React from 'react';
-import Link from 'next/link';
 import { TransitionLink } from '@/components/ui/TransitionLink';
 import Image from 'next/image';
 import { usePathname } from 'next/navigation';
-import { motion, AnimatePresence, useScroll, useTransform } from 'framer-motion';
+import { motion, useScroll, useTransform } from 'framer-motion';
 import { LanguageSwitcher } from './LanguageSwitcher';
-import { Button } from '@/components/ui/Button';
 
 export interface NavLink {
   label: string;
@@ -20,7 +18,6 @@ interface HeaderProps {
 
 export function Header({ navLinks }: HeaderProps) {
   const [isScrolled, setIsScrolled] = React.useState(false);
-  const [isMobileMenuOpen, setIsMobileMenuOpen] = React.useState(false);
   const [forceSolid, setForceSolid] = React.useState(false);
   const pathname = usePathname() || '/';
 
@@ -36,13 +33,6 @@ export function Header({ navLinks }: HeaderProps) {
   // Determine current locale from pathname
   const currentLocale = pathname.startsWith('/en') ? 'en' : 'de';
 
-  // Helper to switch languages
-  const getSwitchedUrl = (newLocale: string) => {
-    if (!pathname) return `/${newLocale}`;
-    const pathWithoutLocale = pathname.replace(/^\/(en|de)/, '');
-    return `/${newLocale}${pathWithoutLocale === '' ? '' : pathWithoutLocale}`;
-  };
-
   React.useEffect(() => {
     const handleScroll = () => {
       setIsScrolled(window.scrollY > 20);
@@ -68,10 +58,7 @@ export function Header({ navLinks }: HeaderProps) {
     };
   }, [pathname]);
 
-  // Close mobile menu on route change
-  React.useEffect(() => {
-    setIsMobileMenuOpen(false);
-  }, [pathname]);
+  // Check for force solid initially
 
   const isSolidMode = isScrolled || forceSolid;
 
@@ -98,9 +85,9 @@ export function Header({ navLinks }: HeaderProps) {
             />
           </div>
 
-          <TransitionLink href={`/${currentLocale}`} className={`relative flex items-center transition-all duration-500 ease-out z-50 group ${isSolidMode ? 'h-9 w-36' : 'h-12 w-48'}`}>
+          <TransitionLink href={`/${currentLocale}`} className={`relative flex items-center transition-all duration-500 ease-out z-50 group ${isSolidMode ? 'h-8 md:h-9 w-28 md:w-36' : 'h-10 md:h-12 w-36 md:w-48'}`}>
             <Image
-              src={(isSolidMode || isMobileMenuOpen) ? "/assets/logo.png" : "/assets/logo-white.png"}
+              src={isSolidMode ? "/assets/logo.png" : "/assets/logo-white.png"}
               alt="E-TIB Gruppe"
               fill
               className="object-contain object-left group-hover:scale-105 transition-transform duration-500 origin-left"
@@ -111,11 +98,11 @@ export function Header({ navLinks }: HeaderProps) {
             <div 
               className="absolute inset-0 z-10 pointer-events-none transition-transform duration-500 origin-left group-hover:scale-105"
               style={{
-                WebkitMaskImage: `url(${(isSolidMode || isMobileMenuOpen) ? "/assets/logo.png" : "/assets/logo-white.png"})`,
+                WebkitMaskImage: `url(${isSolidMode ? "/assets/logo.png" : "/assets/logo-white.png"})`,
                 WebkitMaskSize: 'contain',
                 WebkitMaskRepeat: 'no-repeat',
                 WebkitMaskPosition: 'left center',
-                maskImage: `url(${(isSolidMode || isMobileMenuOpen) ? "/assets/logo.png" : "/assets/logo-white.png"})`,
+                maskImage: `url(${isSolidMode ? "/assets/logo.png" : "/assets/logo-white.png"})`,
                 maskSize: 'contain',
                 maskRepeat: 'no-repeat',
                 maskPosition: 'left center'
@@ -125,7 +112,8 @@ export function Header({ navLinks }: HeaderProps) {
             </div>
           </TransitionLink>
           
-          <nav className="relative z-10 hidden md:flex items-center gap-8 lg:gap-10">
+          <div className="flex items-center gap-2 md:gap-4 ml-auto md:ml-0">
+            <nav className="relative z-10 hidden md:flex items-center gap-8 lg:gap-10">
             {navLinks && navLinks.length > 0 && navLinks.map((link) => {
               const mappedUrl = link.url.startsWith('/') && !link.url.match(/^\/(en|de)/) 
                 ? `/${currentLocale}${link.url}` 
@@ -160,93 +148,34 @@ export function Header({ navLinks }: HeaderProps) {
               );
             })}
             
-            <div className={`h-5 w-px transition-colors duration-300 ${isSolidMode ? 'bg-neutral-200' : 'bg-white/20'}`} />
+            </nav>
             
-            <LanguageSwitcher isSolidMode={isSolidMode} />
-            
-            <TransitionLink
-              href={`/${currentLocale}/${currentLocale === 'de' ? 'kontakt' : 'contact'}`}
-              className={`relative ml-2 px-7 py-2.5 rounded-full font-bold text-xs lg:text-sm uppercase tracking-widest transition-all duration-500 overflow-hidden group/cta isolate ${
-                isSolidMode
-                  ? 'bg-primary text-white shadow-lg shadow-primary/20 hover:shadow-primary/40 hover:-translate-y-0.5 border border-transparent'
-                  : 'bg-white/10 text-white backdrop-blur-md border border-white/30 hover:bg-white/20 hover:-translate-y-0.5 hover:shadow-[0_0_20px_rgba(255,255,255,0.2)]'
-              }`}
-            >
-              <span className="relative z-10 transition-transform duration-300 group-hover/cta:scale-105 inline-block">{currentLocale === 'de' ? 'Kontakt' : 'Contact'}</span>
-              {/* 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>
-          </nav>
-
-          {/* Mobile Nav Button */}
-          <button 
-            className="md:hidden z-50 p-2 relative group"
-            onClick={() => setIsMobileMenuOpen(!isMobileMenuOpen)}
-            aria-label="Toggle menu"
-          >
-            <div className={`absolute inset-0 rounded-full transition-all duration-300 ${isSolidMode ? 'bg-neutral-100 group-hover:bg-neutral-200' : 'bg-white/10 group-hover:bg-white/20'}`} />
-            <svg className="relative z-10 transition-transform duration-300 group-hover:scale-110" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke={(isSolidMode || isMobileMenuOpen) ? "currentColor" : "white"} strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round">
-              {isMobileMenuOpen ? (
-                <>
-                  <line x1="18" y1="6" x2="6" y2="18" className="origin-center animate-in fade-in zoom-in duration-300" />
-                  <line x1="6" y1="6" x2="18" y2="18" className="origin-center animate-in fade-in zoom-in duration-300" />
-                </>
-              ) : (
-                <>
-                  <line x1="3" x2="21" y1="6" y2="6" className="transition-all duration-300 group-hover:translate-x-1" />
-                  <line x1="3" x2="21" y1="12" y2="12" />
-                  <line x1="3" x2="21" y1="18" y2="18" className="transition-all duration-300 group-hover:-translate-x-1" />
-                </>
-              )}
-            </svg>
-          </button>
+            {/* Right side elements (Language Switcher always visible, Contact button desktop only) */}
+            <div className="flex items-center gap-2 md:gap-4 lg:gap-6">
+              <div className={`hidden md:block h-5 w-px transition-colors duration-300 ${isSolidMode ? 'bg-neutral-200' : 'bg-white/20'}`} />
+              
+              {/* Language Switcher visible on all devices */}
+              <div className="z-50 relative flex items-center">
+                <LanguageSwitcher isSolidMode={isSolidMode} />
+              </div>
+              
+              {/* Contact Button Desktop Only */}
+              <TransitionLink
+                href={`/${currentLocale}/${currentLocale === 'de' ? 'kontakt' : 'contact'}`}
+                className={`relative hidden md:inline-flex ml-2 px-7 py-2.5 rounded-full font-bold text-xs lg:text-sm uppercase tracking-widest transition-all duration-500 overflow-hidden group/cta isolate ${
+                  isSolidMode
+                    ? 'bg-primary text-white shadow-lg shadow-primary/20 hover:shadow-primary/40 hover:-translate-y-0.5 border border-transparent'
+                    : 'bg-white/10 text-white backdrop-blur-md border border-white/30 hover:bg-white/20 hover:-translate-y-0.5 hover:shadow-[0_0_20px_rgba(255,255,255,0.2)]'
+                }`}
+              >
+                <span className="relative z-10 transition-transform duration-300 group-hover/cta:scale-105 inline-block">{currentLocale === 'de' ? 'Kontakt' : 'Contact'}</span>
+                {/* Sleek shine sweep effect */}
+                <span className="absolute top-0 -left-[150%] h-[200%] w-[150%] bg-gradient-to-r from-transparent via-white/30 to-transparent skew-x-[-20deg] group-hover/cta:left-[100%] transition-all duration-1000 ease-[cubic-bezier(0.16,1,0.3,1)] z-30 pointer-events-none" />
+              </TransitionLink>
+            </div>
+          </div>
         </div>
       </header>
-
-      {/* Mobile Menu Overlay */}
-      <AnimatePresence>
-        {isMobileMenuOpen && (
-          <motion.div
-            initial={{ opacity: 0, y: -20 }}
-            animate={{ opacity: 1, y: 0 }}
-            exit={{ opacity: 0, y: -20 }}
-            transition={{ duration: 0.2 }}
-            className="fixed inset-0 z-40 bg-white md:hidden pt-32 pb-8 px-6 overflow-y-auto"
-          >
-            <nav className="flex flex-col gap-6">
-              {navLinks && navLinks.length > 0 && navLinks.map((link) => {
-                const mappedUrl = link.url.startsWith('/') && !link.url.match(/^\/(en|de)/) 
-                  ? `/${currentLocale}${link.url}` 
-                  : link.url;
-                  
-                return (
-                  <TransitionLink 
-                    key={link.url}
-                    href={mappedUrl} 
-                    className="text-2xl font-heading font-bold text-neutral-dark border-b border-neutral-100 pb-4"
-                    onClick={() => setIsMobileMenuOpen(false)}
-                  >
-                    {link.label}
-                  </TransitionLink>
-                );
-              })}
-              
-              <TransitionLink 
-                href={`/${currentLocale}/${currentLocale === 'de' ? 'kontakt' : 'contact'}`} 
-                className="text-2xl font-heading font-bold text-primary border-b border-neutral-100 pb-4"
-                onClick={() => setIsMobileMenuOpen(false)}
-              >
-                {currentLocale === 'de' ? 'Kontakt' : 'Contact'}
-              </TransitionLink>
-              
-              <div className="mt-8 pt-6">
-                <p className="text-text-secondary text-sm font-bold uppercase tracking-widest mb-4">Sprache wählen</p>
-                <LanguageSwitcher mobile={true} />
-              </div>
-            </nav>
-          </motion.div>
-        )}
-      </AnimatePresence>
     </>
   );
 }