Fertig, kein weißes flickern

src/App.tsx

@@ -3,40 +3,57 @@ import { Toaster as Sonner } from "@/components/ui/sonner";
 import { TooltipProvider } from "@/components/ui/tooltip";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { BrowserRouter, Routes, Route } from "react-router-dom";
-import Index from "./pages/Index";
-import Services from "./pages/Services";
-import About from "./pages/About";
-import ClientsProjects from "./pages/ClientsProjects";
-import Locations from "./pages/Locations";
-import Careers from "./pages/Careers";
-import Contact from "./pages/Contact";
-import Legal from "./pages/Legal";
-import Privacy from "./pages/Privacy";
-import Terms from "./pages/Terms";
-import NotFound from "./pages/NotFound";
+import { Suspense, lazy } from "react";
+
+// Lazy load pages for better performance
+const Index = lazy(() => import("./pages/Index"));
+const Services = lazy(() => import("./pages/Services"));
+const About = lazy(() => import("./pages/About"));
+const ClientsProjects = lazy(() => import("./pages/ClientsProjects"));
+const Locations = lazy(() => import("./pages/Locations"));
+const Careers = lazy(() => import("./pages/Careers"));
+const Contact = lazy(() => import("./pages/Contact"));
+const Legal = lazy(() => import("./pages/Legal"));
+const Privacy = lazy(() => import("./pages/Privacy"));
+const Terms = lazy(() => import("./pages/Terms"));
+const NotFound = lazy(() => import("./pages/NotFound"));
 
 const queryClient = new QueryClient();
 
+// Loading component to prevent white flash
+const PageLoader = () => (
+  <div className="flex min-h-screen items-center justify-center bg-background">
+    <div className="relative">
+      <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-accent"></div>
+      <div className="absolute inset-0 animate-pulse rounded-full h-12 w-12 border-2 border-accent/20"></div>
+    </div>
+  </div>
+);
+
 const App = () => (
   <QueryClientProvider client={queryClient}>
     <TooltipProvider>
       <Toaster />
       <Sonner />
       <BrowserRouter>
-        <Routes>
-          <Route path="/" element={<Index />} />
-          <Route path="/services-and-specialties" element={<Services />} />
-          <Route path="/about-us" element={<About />} />
-          <Route path="/clients-and-projects" element={<ClientsProjects />} />
-          <Route path="/locations" element={<Locations />} />
-          <Route path="/careers" element={<Careers />} />
-          <Route path="/contact-us" element={<Contact />} />
-          <Route path="/legal" element={<Legal />} />
-          <Route path="/privacy" element={<Privacy />} />
-          <Route path="/terms" element={<Terms />} />
-          {/* ADD ALL CUSTOM ROUTES ABOVE THE CATCH-ALL "*" ROUTE */}
-          <Route path="*" element={<NotFound />} />
-        </Routes>
+        <Suspense fallback={<PageLoader />}>
+          <div className="page-transition">
+            <Routes>
+              <Route path="/" element={<Index />} />
+              <Route path="/services-and-specialties" element={<Services />} />
+              <Route path="/about-us" element={<About />} />
+              <Route path="/clients-and-projects" element={<ClientsProjects />} />
+              <Route path="/locations" element={<Locations />} />
+              <Route path="/careers" element={<Careers />} />
+              <Route path="/contact-us" element={<Contact />} />
+              <Route path="/legal" element={<Legal />} />
+              <Route path="/privacy" element={<Privacy />} />
+              <Route path="/terms" element={<Terms />} />
+              {/* ADD ALL CUSTOM ROUTES ABOVE THE CATCH-ALL "*" ROUTE */}
+              <Route path="*" element={<NotFound />} />
+            </Routes>
+          </div>
+        </Suspense>
       </BrowserRouter>
     </TooltipProvider>
   </QueryClientProvider>

src/components/Header.tsx

@@ -1,10 +1,18 @@
 import React from 'react';
+import { Link, useLocation } from 'react-router-dom';
 import { Button } from '@/components/ui/button';
 import { Menu, X } from 'lucide-react';
 import content from '@/content/content.json';
 
 const Header = () => {
   const [isOpen, setIsOpen] = React.useState(false);
+  const location = useLocation();
+
+  // Function to convert nav item to route path
+  const getRoutePath = (item: string) => {
+    if (item === 'Home') return '/';
+    return `/${item.toLowerCase().replace(/\s+/g, '-').replace('&', 'and')}`;
+  };
 
   return (
     <>
@@ -17,9 +25,9 @@ const Header = () => {
               <span className="text-sm text-muted">
                 Professional welding services across Texas — Get your quote today
               </span>
-              <a href="/contact-us" className="text-accent hover:text-accent/80 text-sm font-medium ml-2">
+              <Link to="/contact-us" className="text-accent hover:text-accent/80 text-sm font-medium ml-2">
                 Learn more →
-              </a>
+              </Link>
             </div>
           </div>
         </div>
@@ -30,27 +38,33 @@ const Header = () => {
         <div className="container mx-auto px-4">
           <div className="flex h-16 items-center justify-between">
             {/* Logo - IIT Logo */}
-            <a href="/" className="flex items-center focus-ring rounded-md">
+            <Link to="/" className="flex items-center focus-ring rounded-md">
               <img 
                 src="/IIT-Logo-Web.png" 
                 alt="IIT Welding" 
                 className="h-10 w-auto"
               />
-            </a>
+            </Link>
 
             {/* Desktop Navigation - Dispel Style */}
             <nav className="hidden md:flex items-center space-x-8" aria-label="Primary navigation">
-              {content.nav.map((item) => (
-                <a
-                  key={item}
-                  href={`/${item.toLowerCase().replace(/\s+/g, '-').replace('&', 'and')}`}
-                  className="text-black hover:text-gray-600 transition-smooth focus-ring rounded-md px-2 py-1 font-medium"
-                >
-                  {item}
-                </a>
-              ))}
-            </nav>
+              {content.nav.map((item) => {
+                const routePath = getRoutePath(item);
+                const isActive = location.pathname === routePath;
                 
+                return (
+                  <Link
+                    key={item}
+                    to={routePath}
+                    className={`text-black hover:text-gray-600 transition-smooth focus-ring rounded-md px-2 py-1 font-medium ${
+                      isActive ? 'text-blue-600 font-semibold' : ''
+                    }`}
+                  >
+                    {item}
+                  </Link>
+                );
+              })}
+            </nav>
 
             {/* Mobile Menu Button */}
             <button
@@ -67,16 +81,23 @@ const Header = () => {
           {isOpen && (
             <nav className="md:hidden py-4 border-t border-slate-600" aria-label="Mobile navigation">
               <div className="flex flex-col space-y-4">
-                {content.nav.map((item) => (
-                  <a
-                    key={item}
-                    href={`/${item.toLowerCase().replace(/\s+/g, '-').replace('&', 'and')}`}
-                    className="text-black hover:text-gray-600 transition-smooth focus-ring rounded-md px-2 py-2 font-medium"
-                    onClick={() => setIsOpen(false)}
-                  >
-                    {item}
-                  </a>
-                ))}
+                {content.nav.map((item) => {
+                  const routePath = getRoutePath(item);
+                  const isActive = location.pathname === routePath;
+                  
+                  return (
+                    <Link
+                      key={item}
+                      to={routePath}
+                      className={`text-black hover:text-gray-600 transition-smooth focus-ring rounded-md px-2 py-2 font-medium ${
+                        isActive ? 'text-blue-600 font-semibold' : ''
+                      }`}
+                      onClick={() => setIsOpen(false)}
+                    >
+                      {item}
+                    </Link>
+                  );
+                })}
               </div>
             </nav>
           )}

src/index.css

@@ -71,15 +71,48 @@
 
   html {
     scroll-behavior: smooth;
+    /* Prevent layout shift and ensure consistent background */
+    overflow-x: hidden;
+    background-color: hsl(210 24% 8%) !important;
   }
 
   body {
     @apply bg-background text-foreground font-sans antialiased;
     color-scheme: dark;
+    /* Prevent white flash during navigation */
+    background-color: hsl(210 24% 8%) !important;
+    min-height: 100vh;
+  }
+
+  /* Prevent flash of unstyled content */
+  #root {
+    background-color: hsl(210 24% 8%);
+    min-height: 100vh;
   }
 }
 
 @layer components {
+  /* Page transition styles */
+  .page-transition {
+    opacity: 1;
+    transition: opacity 0.2s ease-in-out;
+    background-color: hsl(210 24% 8%);
+    min-height: 100vh;
+  }
+
+  .page-transition-enter {
+    opacity: 0;
+  }
+
+  .page-transition-exit {
+    opacity: 1;
+  }
+
+  .page-transition-exit-active {
+    opacity: 0;
+    transition: opacity 0.2s ease-in-out;
+  }
+
   /* Hero section styling */
   .hero-gradient {
     background: var(--gradient-hero);