diff --git a/backend/app/Views/CurriculumStudio.php b/backend/app/Views/CurriculumStudio.php
index 9d10f5b..3da2e31 100644
--- a/backend/app/Views/CurriculumStudio.php
+++ b/backend/app/Views/CurriculumStudio.php
@@ -439,6 +439,27 @@ class CurriculumStudio
             return d.innerHTML;
         }
     </script>
+
+    <!-- Upload Progress Modal -->
+    <div id="upload_progress_overlay" style="display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(10, 15, 26, 0.85); backdrop-filter: blur(8px); z-index: 9999; flex-direction: column; align-items: center; justify-content: center;">
+        <div style="background: var(--bg-card); padding: 30px; border-radius: 16px; border: 1px solid var(--border-color); width: 400px; max-width: 90%; text-align: center; box-shadow: 0 10px 40px rgba(0,0,0,0.5);">
+            <div id="ai_spinner" style="font-size: 40px; margin-bottom: 15px; animation: pulse 1.5s infinite;">🧠</div>
+            <h3 style="color: var(--text-primary); margin-bottom: 10px; font-family: 'SF Arabic', sans-serif;">معالجة الذكاء الاصطناعي</h3>
+            <div style="width: 100%; background: var(--bg-hover); border-radius: 10px; height: 10px; margin-bottom: 15px; overflow: hidden; position: relative;">
+                <div id="upload_progress_bar" style="height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent-gold), #ffed4a); transition: width 0.4s ease;"></div>
+            </div>
+            <p id="upload_progress_text" style="color: var(--text-secondary); font-size: 13px; font-weight: bold;">جاري التهيئة...</p>
+            <p id="upload_progress_percent" style="color: var(--accent-gold); font-size: 12px; margin-top: 5px;">0%</p>
+        </div>
+    </div>
+    <style>
+        @keyframes pulse {
+            0% { transform: scale(1); opacity: 1; }
+            50% { transform: scale(1.1); opacity: 0.7; }
+            100% { transform: scale(1); opacity: 1; }
+        }
+    </style>
+
 </body>
 </html>
         <?php
diff --git a/backend/scripts/curriculum_worker.php b/backend/scripts/curriculum_worker.php
index 42981ff..693d5ad 100644
--- a/backend/scripts/curriculum_worker.php
+++ b/backend/scripts/curriculum_worker.php
@@ -164,8 +164,13 @@ $payload = [
 updateState($stateFile, 'analyzing', 70, 'جاري تطبيقหน่วงزمني (4 ثوانٍ) لتفادي حدود الاستخدام (Rate Limit)...');
 sleep(4);
 
-// Using gemini-2.0-flash as requested by the user
-$url = "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent?key=" . $geminiKey;
+// Allow custom model from .env (e.g. gemini-2.0-flash-lite-preview-02-05 or gemini-2.0-flash)
+$geminiModel = Env::get('GEMINI_MODEL') ?: getenv('GEMINI_MODEL');
+if (empty($geminiModel)) {
+    $geminiModel = "gemini-2.0-flash-lite-preview-02-05"; // fallback to latest flash lite
+}
+updateState($stateFile, 'analyzing', 75, "جاري إرسال البيانات للنموذج [{$geminiModel}]...");
+$url = "https://generativelanguage.googleapis.com/v1beta/models/{$geminiModel}:generateContent?key=" . $geminiKey;
 
 $ch = curl_init($url);
 curl_setopt_array($ch, [