UI优化：Step9单选框样式美化（选中态蓝色实心圆点+悬停效果）

src/gui/panels/step9_panel.py

@@ -109,6 +109,37 @@ class Step9Panel(QWidget):
         mode_row.addStretch()
         layout.addLayout(mode_row)
 
+        # ---------- RadioButton 美化样式（选中状态更醒目） ----------
+        radio_style = """
+            QRadioButton {
+                font-size: 14px;
+                spacing: 8px;
+                color: #333333;
+            }
+            QRadioButton::indicator {
+                width: 18px;
+                height: 18px;
+                border: 2px solid #999999;
+                border-radius: 9px;
+                background-color: white;
+            }
+            QRadioButton::indicator:checked {
+                border: 2px solid #0078d4;
+                background-color: qradialgradient(
+                    cx:0.5, cy:0.5, radius:0.5,
+                    fx:0.5, fy:0.5,
+                    stop:0 #0078d4,
+                    stop:0.6 white,
+                    stop:1.0 white
+                );
+            }
+            QRadioButton::indicator:hover {
+                border: 2px solid #005a9e;
+            }
+        """
+        self.mode_single_rb.setStyleSheet(radio_style)
+        self.mode_folder_rb.setStyleSheet(radio_style)
+
         self.prediction_csv_file = FileSelectWidget(
             "预测结果CSV:",
             "CSV Files (*.csv);;All Files (*.*)"