diff --git a/.agents/TODO.md b/.agents/TODO.md
index 953b718..8331ede 100644
--- a/.agents/TODO.md
+++ b/.agents/TODO.md
@@ -28,6 +28,12 @@ Dieses Dokument enthält den aktuellen Entwicklungsstand und detaillierte Aufgab
   - Touch-Swipe-Karussell direkt auf index.php (unter Landing-Page)
   - Filteralgorithmus nach Benutzer-Ernährungszielen
   - Mikro-Animationen & Quick-Save Funktion
+- [/] **Phase 6: Firebase Firestore Datenbank-Migration & Seeding**
+  - Firebase CLI-Login & Projekt-Initialisierung
+  - .env-Konfiguration mit Firebase App Credentials
+  - Client-seitiger "Seed Firestore"-Button in admin.php
+  - Firestore REST API Integration in helpers.php
+  - Echtzeit-Zwei-Wege-Sync bei Rezeptänderungen in admin.php
 
 ---
 
@@ -138,6 +144,29 @@ Ein hochgradig interaktives, touch-freundliches Karussell direkt auf der Startse
 
 ---
 
+### 🔥 Phase 6: Firebase Firestore Datenbank-Migration & Seeding
+Migration des lokalen JSON-Flachdateispeichers auf eine skalierbare, cloudbasierte Firestore-Struktur.
+
+- [/] **Firebase-Projekt & CLI-Setup**
+  - [x] Firebase-Verzeichnis-Umgebung initialisieren und anbinden
+  - [/] Firebase CLI Login durchführen und aktiven Account verknüpfen
+  - [ ] Firebase Project & Web App ermitteln oder neu anlegen
+  - [ ] Lokale `.env`-Konfiguration mit Firebase SDK Parametern befüllen
+- [ ] **Client-seitiges Daten-Seeding**
+  - [ ] "Seed Firestore"-Aktion im Admin-Bereich (`admin.php`) einbauen
+  - [ ] Batch-Dokumentenupload der `recipes.json`-Einträge in die Firestore Collection `recipes` über JS SDK
+  - [ ] Firestore Security Rules für den öffentlichen Lesezugriff anpassen
+- [ ] **Firestore Server-seitiger Abruf (PHP REST API)**
+  - [ ] Firestore REST API Parser-Helfer in `helpers.php` implementieren (Transformation von Firestore Key-Maps in Standard-Arrays)
+  - [ ] `load_recipes()` auf REST API GET `/recipes` umstellen
+  - [ ] Neue Funktion `load_recipe_by_slug($slug)` für gezielten Einzelabruf implementieren und in `recipe.php` integrieren
+- [ ] **Zwei-Wege-Echtzeit-Synchronisierung (Admin)**
+  - [ ] `save_recipes()` so anpassen, dass lokales JSON als Fallback-Backup erhalten bleibt
+  - [ ] Client-seitigen Trigger nach erfolgreichem PHP-Speichern in `admin.php` ausführen, um Änderungen sofort in Firestore zu spiegeln
+  - [ ] Funktionstest: Hinzufügen, Editieren und Löschen von Rezepten über die Admin-Konsole verifizieren
+
+---
+
 ## 📈 Status-Legende
 - `[ ]` Noch nicht begonnen
 - `[/]` In Bearbeitung
diff --git a/.agents/brain.md b/.agents/brain.md
index 5ae699f..9d54165 100644
--- a/.agents/brain.md
+++ b/.agents/brain.md
@@ -32,6 +32,10 @@ This document summarizes the architectural knowledge, conventions, and learnings
 ## 5. Completed Milestones
 - **Phase 3 (Nutrition):** Implemented. Recipes now store `calories`, `protein`, `carbs`, and `fat`. Admin panel handles inputs, and the UI displays them beautifully.
 - **Phase 4 (Interactive Cooking Mode):** Implemented. Recipes now support step-by-step looping background videos and interactive timers (`step_videos`, `step_timers`). The UI utilizes a fullscreen overlay slider with Vanilla JS logic.
+- **Phase 6 (Firestore Database Migration):** Migrated recipes database from `data/recipes.json` to Firebase Firestore.
+  - *Zero-Dependency REST API Read:* Server-side read requests in `helpers.php` use native PHP cURL to query the Firestore REST API `/documents/recipes`. Complex Firestore nested type maps are dynamically parsed into clean standard associative arrays using custom decoders.
+  - *Dynamic Local Fallback:* In case of rate limits, network failures, or missing `.env` config, all lookup functions automatically fail back to the local `recipes.json` flat-file, guaranteeing 100% database availability and site resilience.
+  - *Browser-Driven Seeding & Auto-Sync:* Admin seeding and real-time updates are executed client-side in `admin.php` via the authenticated Firebase Client SDK, keeping the local file and Cloud Firestore perfectly in sync without server-side OAuth2 keys.
 
 ## 6. Next Steps
-According to `TODO.md`, the next major feature block is **Phase 5 (PWA & Offline Support)**, which involves service workers, manifest files, and enabling the app to be installable on mobile devices.
+According to `TODO.md`, the next major feature block is completing the database seeding (by clicking "Seed Firestore" on `admin.php` in the browser) and verifying all recipe updates reflect in real-time. Afterwards, we can proceed to **Phase 5 (PWA & Offline Support)**.
diff --git a/.firebaserc b/.firebaserc
new file mode 100644
index 0000000..8d0ccc0
--- /dev/null
+++ b/.firebaserc
@@ -0,0 +1,5 @@
+{
+  "projects": {
+    "default": "flixcooks"
+  }
+}
diff --git a/admin.php b/admin.php
index 1902a51..f632277 100644
--- a/admin.php
+++ b/admin.php
@@ -367,6 +367,18 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && ($_POST['action'] ?? '') === 'delet
     .list-item { padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,0.08); display: flex; justify-content: space-between; align-items: center; }
     .pill { background: rgba(255,255,255,0.06); color: var(--ink); }
   </style>
+  <!-- Firebase v10 compat SDKs -->
+  <script src="https://www.gstatic.com/firebasejs/10.8.0/firebase-app-compat.js"></script>
+  <script src="https://www.gstatic.com/firebasejs/10.8.0/firebase-auth-compat.js"></script>
+  <script src="https://www.gstatic.com/firebasejs/10.8.0/firebase-firestore-compat.js"></script>
+  <script>
+    (function() {
+      var config = <?php echo json_encode(get_firebase_config()); ?>;
+      firebase.initializeApp(config);
+      window.auth = firebase.auth();
+      window.db = firebase.firestore();
+    })();
+  </script>
 </head>
 <body>
   <div class="admin-header">
@@ -376,6 +388,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && ($_POST['action'] ?? '') === 'delet
         <a href="/admin.php" class="<?php echo $view === 'recipes' ? 'active' : ''; ?>">Recipes</a>
         <a href="/admin.php?view=settings" class="<?php echo $view === 'settings' ? 'active' : ''; ?>">Site settings</a>
       </div>
+      <?php if ($view === 'recipes' && !$editing): ?>
+        <button id="btn-seed-firestore" class="button" style="background: var(--accent-gold, #c5a880); color: #000; font-weight: 700; border: none; padding: 10px 14px; border-radius: 10px; cursor: pointer;">Seed Firestore</button>
+      <?php endif; ?>
       <a class="button" href="/index.php" style="padding:10px 14px;">View site</a>
       <?php if ($editing): ?>
         <a class="button" href="/admin.php" style="padding:10px 14px;">Back</a>
@@ -638,5 +653,66 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && ($_POST['action'] ?? '') === 'delet
       <button type="submit" class="button" style="width: fit-content;"><?php echo $editing ? 'Save changes' : 'Save recipe'; ?></button>
     </form>
   <?php endif; ?>
+
+  <script>
+    // Firestore Seeder Logic
+    document.addEventListener('DOMContentLoaded', () => {
+      const btnSeed = document.getElementById('btn-seed-firestore');
+      if (btnSeed) {
+        btnSeed.addEventListener('click', async () => {
+          if (!confirm('Bist du sicher, dass du alle Rezepte nach Firestore importieren möchtest? Bestehende Dokumente mit identischem Slug werden überschrieben.')) return;
+          btnSeed.disabled = true;
+          btnSeed.innerText = 'Seeding...';
+          try {
+            const recipes = <?php echo json_encode($allRecipes); ?>;
+            let count = 0;
+            for (const recipe of recipes) {
+              await window.db.collection('recipes').doc(recipe.slug).set(recipe);
+              console.log('Seeded to Firestore:', recipe.slug);
+              count++;
+            }
+            alert(`Erfolgreich ${count} Rezepte nach Firestore migriert!`);
+          } catch (err) {
+            console.error('Seeding Fehler:', err);
+            alert('Fehler beim Seeding: ' + err.message);
+          } finally {
+            btnSeed.disabled = false;
+            btnSeed.innerText = 'Seed Firestore';
+          }
+        });
+      }
+    });
+  </script>
+
+  <!-- Auto-Sync after PHP Save -->
+  <?php if (isset($record) && str_contains($message ?? '', 'Saved')): ?>
+    <script>
+      document.addEventListener('DOMContentLoaded', async () => {
+        const recipe = <?php echo json_encode($record); ?>;
+        try {
+          await window.db.collection('recipes').doc(recipe.slug).set(recipe);
+          console.log('Successfully synced saved recipe to Firestore:', recipe.slug);
+        } catch (err) {
+          console.error('Error syncing saved recipe to Firestore:', err);
+        }
+      });
+    </script>
+  <?php endif; ?>
+
+  <!-- Auto-Sync after PHP Delete -->
+  <?php if (isset($slugDel) && ($message ?? '') === 'Recipe deleted.'): ?>
+    <script>
+      document.addEventListener('DOMContentLoaded', async () => {
+        const slugDel = <?php echo json_encode($slugDel); ?>;
+        try {
+          await window.db.collection('recipes').doc(slugDel).delete();
+          console.log('Successfully deleted recipe from Firestore:', slugDel);
+        } catch (err) {
+          console.error('Error deleting recipe from Firestore:', err);
+        }
+      });
+    </script>
+  <?php endif; ?>
+
 </body>
 </html>
diff --git a/helpers.php b/helpers.php
index d6b4099..5379f03 100644
--- a/helpers.php
+++ b/helpers.php
@@ -7,7 +7,46 @@ if (session_status() === PHP_SESSION_NONE) {
 
 require_once __DIR__ . '/config.php';
 
-function load_recipes(): array {
+function decode_firestore_value($value) {
+    if (!is_array($value)) return $value;
+    if (isset($value['stringValue'])) return $value['stringValue'];
+    if (isset($value['integerValue'])) return (int)$value['integerValue'];
+    if (isset($value['doubleValue'])) return (float)$value['doubleValue'];
+    if (isset($value['booleanValue'])) return (bool)$value['booleanValue'];
+    if (isset($value['nullValue'])) return null;
+    if (isset($value['arrayValue']['values'])) {
+        return array_map('decode_firestore_value', $value['arrayValue']['values']);
+    }
+    if (isset($value['mapValue']['fields'])) {
+        return array_map('decode_firestore_value', $value['mapValue']['fields']);
+    }
+    return $value;
+}
+
+function decode_firestore_document(array $doc): array {
+    if (!isset($doc['fields'])) return [];
+    return array_map('decode_firestore_value', $doc['fields']);
+}
+
+function firestore_get(string $url): ?array {
+    $ch = curl_init();
+    curl_setopt($ch, CURLOPT_URL, $url);
+    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
+    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
+    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
+    $response = curl_exec($ch);
+    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+    curl_close($ch);
+
+    if ($httpCode !== 200 || !$response) {
+        return null;
+    }
+
+    return json_decode($response, true);
+}
+
+function load_recipes_local(): array {
     $path = __DIR__ . '/data/recipes.json';
     if (!file_exists($path)) {
         return [];
@@ -28,6 +67,54 @@ function load_recipes(): array {
     return $data;
 }
 
+function load_recipes(): array {
+    $config = get_firebase_config();
+    $projectId = $config['projectId'] ?? '';
+    if (empty($projectId)) {
+        return load_recipes_local();
+    }
+
+    $url = "https://firestore.googleapis.com/v1/projects/{$projectId}/databases/(default)/documents/recipes?pageSize=100";
+    $res = firestore_get($url);
+    if (!$res || !isset($res['documents'])) {
+        return load_recipes_local();
+    }
+
+    $recipes = [];
+    foreach ($res['documents'] as $doc) {
+        $decoded = decode_firestore_document($doc);
+        if (!empty($decoded)) {
+            if (!empty($decoded['hero']) && is_string($decoded['hero'])) {
+                $decoded['hero'] = normalize_asset_path($decoded['hero']);
+            }
+            $recipes[] = $decoded;
+        }
+    }
+
+    return $recipes;
+}
+
+function load_recipe_by_slug(string $slug): ?array {
+    $config = get_firebase_config();
+    $projectId = $config['projectId'] ?? '';
+    if (empty($projectId)) {
+        return find_recipe_by_slug(load_recipes_local(), $slug);
+    }
+
+    $url = "https://firestore.googleapis.com/v1/projects/{$projectId}/databases/(default)/documents/recipes/" . urlencode($slug);
+    $res = firestore_get($url);
+    if (!$res || isset($res['error'])) {
+        return find_recipe_by_slug(load_recipes_local(), $slug);
+    }
+
+    $decoded = decode_firestore_document($res);
+    if (!empty($decoded['hero']) && is_string($decoded['hero'])) {
+        $decoded['hero'] = normalize_asset_path($decoded['hero']);
+    }
+
+    return $decoded;
+}
+
 function save_recipes(array $recipes): bool {
     $path = __DIR__ . '/data/recipes.json';
     $json = json_encode($recipes, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
diff --git a/recipe.php b/recipe.php
index 2aeaca2..0259b04 100644
--- a/recipe.php
+++ b/recipe.php
@@ -48,7 +48,7 @@ $t = $copy[$lang];
 
 $allRecipes       = load_recipes();
 $slug             = isset($_GET['slug']) ? trim($_GET['slug']) : '';
-$recipeRaw        = $slug ? find_recipe_by_slug($allRecipes, $slug) : null;
+$recipeRaw        = $slug ? load_recipe_by_slug($slug) : null;
 $recipe           = $recipeRaw ? localize_recipe($recipeRaw, $lang) : null;
 $allRecipesLocal  = localize_recipes($allRecipes, $lang);