Update app.py

app.py

@@ -1658,18 +1658,39 @@ def show_main_app():
 
 
      * File Uploader */
-    /*[data-testid="stFileUploaderDropzone"] {
-        border-radius: 12px; /* More rounded */
-        border: 2px dashed #a0a8b4;
-        background-color: #ffffff;
-        padding: 25px; /* More padding */
-        transition: border-color 0.3s ease, background-color 0.3s ease;
-        margin-bottom: 1.5rem;
-    }
+   /* Modern card-style file uploader */
+    [data-testid="stFileUploaderDropzone"] {
+    border-radius: 20px;
+    border: none;
+    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+    padding: 30px;
+    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
+    transition: all 0.3s ease;
+    margin-bottom: 2rem;
+    position: relative;
+    overflow: hidden;
+          }
+
     [data-testid="stFileUploaderDropzone"]:hover {
-        border-color: #5d6dbe; /* Highlight on hover */
-        background-color: #f7f9fb; */
-    }
+    transform: translateY(-5px);
+    box-shadow: 0 15px 40px rgba(0,0,0,0.3);
+             }
+
+   [data-testid="stFileUploaderDropzone"]:before {
+    content: '';
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background: rgba(255,255,255,0.1);
+    opacity: 0;
+    transition: opacity 0.3s ease;
+            }
+
+    [data-testid="stFileUploaderDropzone"]:hover:before {
+    opacity: 1;
+          }
     /* Force ALL text inside file uploader dropzone to black */
     [data-testid="stFileUploaderDropzone"] *,
     [data-testid="stFileUploaderDropzone"] p,