Update app.py

app.py

@@ -1983,8 +1983,15 @@ def create_demo():
     ::-webkit-scrollbar-thumb { background: rgba(139, 92, 246, 0.4); border-radius: 3px; }
     ::-webkit-scrollbar-thumb:hover { background: rgba(139, 92, 246, 0.6); }
     """
+    # Force dark mode via JavaScript so Gradio's internal CSS variables default to dark
+    dark_mode_js = """
+    function() {
+        document.body.classList.add('dark');
+        document.documentElement.classList.add('dark');
+    }
+    """
     
-    with gr.Blocks(title="LocalDuo", theme=custom_theme, css=css) as demo:
+    with gr.Blocks(title="LocalDuo", theme=custom_theme, css=css, js=dark_mode_js) as demo:
         gr.Markdown("# LocalDuo — Learn Korean from PDFs, Websites & YouTube")
         gr.Markdown("🇰🇷✨ Enter a website URL 🌐, upload a PDF 📄, upload an audio file 🎵, or paste a YouTube link 🎬. The app uses a **Vision-Language Model (VLM)** 🧠, **ASR** 🎤, and **TTS** 🗣️ to generate vocabulary flashcards.")