diff --git a/app/Support/DomainAssetContext.php b/app/Support/DomainAssetContext.php
index f410211b..25ee8a56 100644
--- a/app/Support/DomainAssetContext.php
+++ b/app/Support/DomainAssetContext.php
@@ -55,7 +55,13 @@ class DomainAssetContext
             return array_merge($defaults, $configuredDomains[$themeOverride]);
         }
 
-        $portalHost = (string) config('domains.domain_portal');
+        // www-Varianten zählen als ihre Apex-Domain: Ohne Normalisierung
+        // fiele z. B. www.presseecho.de auf das Portal-Default-Theme zurück,
+        // dessen theme-portal.css im Web-Build nicht existiert → 500
+        // (ViteException) auf allen Route::view-Seiten (Impressum, AGB, …).
+        $host = self::normalizedHost($host);
+
+        $portalHost = self::normalizedHost((string) config('domains.domain_portal'));
 
         if ($host === $portalHost) {
             $request ??= request();
@@ -72,7 +78,9 @@ class DomainAssetContext
                 continue;
             }
 
-            if (($config['domain_name'] ?? null) === $host) {
+            $domainName = $config['domain_name'] ?? null;
+
+            if (is_string($domainName) && self::normalizedHost($domainName) === $host) {
                 return array_merge($defaults, $config);
             }
         }
@@ -80,6 +88,16 @@ class DomainAssetContext
         return $defaults;
     }
 
+    /**
+     * Kleingeschriebener Host ohne führendes "www.".
+     */
+    private static function normalizedHost(string $host): string
+    {
+        $host = strtolower(trim($host));
+
+        return str_starts_with($host, 'www.') ? substr($host, 4) : $host;
+    }
+
     public static function isBackendRequest(Request $request): bool
     {
         if ($request->routeIs(
diff --git a/tests/Feature/DomainAssetContextTest.php b/tests/Feature/DomainAssetContextTest.php
index b1a6f448..bd155375 100644
--- a/tests/Feature/DomainAssetContextTest.php
+++ b/tests/Feature/DomainAssetContextTest.php
@@ -50,6 +50,28 @@ test('presseecho resolves to its own web theme', function () {
         ->and($config['assets_dir'])->toBe('build/web');
 });
 
+test('www hosts resolve like their apex domain instead of the portal fallback', function () {
+    $defaults = ['theme' => 'portal', 'assets_dir' => 'build/portal'];
+    $domains = config('domains.domains');
+
+    // Ohne www-Normalisierung fiele der Host aufs Portal-Default zurück,
+    // dessen theme-portal.css im Web-Build fehlt → 500 auf Route::view-Seiten.
+    $config = DomainAssetContext::resolve('www.presseecho.test', $defaults, $domains);
+
+    expect($config['theme'])->toBe('presseecho')
+        ->and($config['assets_dir'])->toBe('build/web');
+
+    $hub = DomainAssetContext::resolve(
+        'WWW.pressekonto.test',
+        $defaults,
+        $domains,
+        null,
+        Request::create('https://www.pressekonto.test/', 'GET'),
+    );
+
+    expect($hub['theme'])->toBe('pressekonto');
+});
+
 test('hot file path depends on asset bundle', function () {
     expect(DomainAssetContext::hotFilePath('build/web'))
         ->toEndWith('hot-web')