Fix theme customization error

app.py

@@ -24,7 +24,7 @@ from utils import plot_detection
 from database import save_report, get_report_history
 
 # Set theme and styling
-LIGHT_THEME = gr.themes.Soft(
+THEME = gr.themes.Soft(
     primary_hue="blue",
     secondary_hue="indigo",
     neutral_hue="slate",
@@ -32,20 +32,8 @@ LIGHT_THEME = gr.themes.Soft(
     text_size=gr.themes.sizes.text_md,
 )
 
-DARK_THEME = gr.themes.Soft(
-    primary_hue="blue",
-    secondary_hue="indigo",
-    neutral_hue="slate",
-    radius_size=gr.themes.sizes.radius_sm,
-    text_size=gr.themes.sizes.text_md,
-).set(
-    body_background_fill="*neutral_950",
-    background_fill_primary="*neutral_900",
-    background_fill_secondary="*neutral_800",
-    text_color="*neutral_200",
-    color_accent_soft="*primary_800",
-    border_color_accent_subdued="*primary_700",
-)
+# Create a simple dark mode flag instead of custom theme
+DARK_MODE = False
 
 class TechnicalReportGenerator:
     def __init__(self):
@@ -457,17 +445,13 @@ def get_gpu_utilization():
 
 def toggle_dark_mode():
     """Toggle between light and dark themes"""
-    current_theme = getattr(toggle_dark_mode, "current_theme", "light")
-    if current_theme == "light":
-        toggle_dark_mode.current_theme = "dark"
-        return DARK_THEME
-    else:
-        toggle_dark_mode.current_theme = "light"
-        return LIGHT_THEME
+    global DARK_MODE
+    DARK_MODE = not DARK_MODE
+    return gr.Theme.darkmode() if DARK_MODE else THEME
 
 # Create Gradio interface
-with gr.Blocks(theme=LIGHT_THEME) as iface:
-    theme_state = gr.State(LIGHT_THEME)
+with gr.Blocks(theme=THEME) as iface:
+    theme_state = gr.State(THEME)
     
     with gr.Row():
         gr.Markdown("# Radar Image Analysis System")