fix: simplify theme and remove custom fonts

- Remove custom font references
- Simplify theme configuration
- Remove unused CSS classes
- Use system default fonts

app.py

@@ -196,20 +196,15 @@ class ChatInterface:
         with gr.Blocks(
             title="Advanced Agentic System",
             theme=gr.themes.Soft(
-                primary_hue=gr.themes.colors.blue,
-                secondary_hue=gr.themes.colors.sky,
-                neutral_hue=gr.themes.colors.gray,
-                spacing_size="lg",
-                radius_size="lg",
-                text_size="lg",
-                font=["Poppins", "ui-sans-serif", "system-ui", "sans-serif"],
+                primary_hue="blue",
+                secondary_hue="indigo",
+                neutral_hue="slate",
             ),
             css="""
                 .gradio-container {
                     max-width: 1200px !important;
                     margin: auto;
                     padding: 20px;
-                    font-family: 'Poppins', ui-sans-serif, system-ui, sans-serif;
                 }
                 .chat-message {
                     padding: 15px;
@@ -246,16 +241,6 @@ class ChatInterface:
                     padding: 1rem;
                     margin: 0.5rem 0;
                 }
-                .avatar {
-                    width: 40px;
-                    height: 40px;
-                    border-radius: 50%;
-                    margin-right: 10px;
-                }
-                .timestamp {
-                    font-size: 0.8rem;
-                    color: var(--neutral-500);
-                }
             """
         ) as interface:
             gr.Markdown("""