diff --git a/app/.htaccess b/app/.htaccess
index e34fbe6..6dfcd90 100644
--- a/app/.htaccess
+++ b/app/.htaccess
@@ -20,7 +20,9 @@ RewriteEngine On
 # Alles auf index.php umleiten, außer echte Dateien/Verzeichnisse
 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteCond %{REQUEST_FILENAME} !-d
-RewriteRule ^(.*)$ index.php [QSA,L]
+RewriteRule ^([a-z\-]*)$ index.php?module=$1 [QSA,L]
+RewriteRule ^([a-z\-]*)/([a-z]*)$ index.php?module=$1&action=$2 [QSA,L]
+RewriteRule ^$ index.php [QSA,L]
 
 # =========================
 # Standard-Dokument
diff --git a/app/modules/floors/list.php b/app/modules/floors/list.php
index 9a4fb5d..85fffe5 100644
--- a/app/modules/floors/list.php
+++ b/app/modules/floors/list.php
@@ -75,7 +75,7 @@
             </td>
 
             <td>
-                <a href="/?page=floors/edit&id=1">Bearbeiten</a>
+                <a href="/floors/edit?id=1">Bearbeiten</a>
                 <button>Löschen</button>
             </td>
         </tr>
@@ -91,6 +91,6 @@
 <?php /* if (empty($floors)): */ ?>
 <div class="empty-state">
     <p>Noch keine Stockwerke angelegt.</p>
-    <p><a href="/?page=floors/edit">Erstes Stockwerk anlegen</a></p>
+    <p><a href="/floors/edit">Erstes Stockwerk anlegen</a></p>
 </div>
 <?php /* endif; */ ?>
diff --git a/app/templates/header.php b/app/templates/header.php
index 7569fc5..3aaced3 100644
--- a/app/templates/header.php
+++ b/app/templates/header.php
@@ -26,8 +26,36 @@
 <header>
     <h1>Netzwerk-Dokumentation</h1>
 
-    <!-- TODO: Navigation einfügen -->
-    <!-- Beispiel: Links zu Dashboard, Gerätetypen, Geräte, Racks, Floors, Connections -->
+    <?php
+    $currentPath = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
+
+    $navItems = [
+        '/' => 'Dashboard',
+        '/device-types' => 'Gerätetypen',
+        '/devices' => 'Geräte',
+        '/racks' => 'Racks',
+        '/floors' => 'Grundrisse',
+        '/connections' => 'Verbindungen',
+    ];
+    ?>
+
+    <nav class="main-nav">
+        <ul>
+            <?php foreach ($navItems as $url => $label): ?>
+                <?php
+                    $active = ($currentPath === $url || str_starts_with($currentPath, $url . '/'))
+                        ? 'active'
+                        : '';
+                ?>
+                <li class="<?= $active ?>">
+                    <a href="<?= htmlspecialchars($url) ?>">
+                        <?= htmlspecialchars($label) ?>
+                    </a>
+                </li>
+            <?php endforeach; ?>
+        </ul>
+    </nav>
+
 </header>
 
 <main>