Update app.py

app.py

@@ -528,7 +528,7 @@ vanta_html = """
 <div id="vanta-bg" style="width:100%;height:380px;border-radius:12px;position:relative;">
   <div class="login-card" role="region" aria-label="Login card">
     <div class="login-logo">
-      <img src="%s" alt="logo" style="height:48px;width:48px;border-radius:8px;"/>
+      <img src="{LOGO}" alt="logo" style="height:48px;width:48px;border-radius:8px;"/>
       <div>
         <div class="brand-title">DataSynth — Analytics Hub</div>
         <div style="font-size:12px;color:#666;">Fast, modular data profiling & model building</div>
@@ -561,7 +561,10 @@ vanta_html = """
     }
   })();
 </script>
-""" % LOGO_PATH
+"""
+
+# inject logo path safely (avoids % formatting issues)
+vanta_html = vanta_html.replace("{LOGO}", LOGO_PATH)
 
 # Gradio app layout
 with gr.Blocks(css=css, title="DataSynth — Analytics Hub") as demo: