diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index afd7d9b..54f064c 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -66,6 +66,9 @@ MainWindow::MainWindow(QWidget *parent)
             filterAppsByKeyword(keyword);
         });
         initStyle();
+
+        // 确保搜索框内容为空，placeholder 能显示
+        ui->searchPlainTextEdit->clear();
     });
 
     // 启动异步任务
@@ -91,6 +94,9 @@ void MainWindow::initStyle()
             line-height: 1.4;
             color: #9CA3AF;
         }
+        QPlainTextEdit[placeholderText]:empty {
+            color: #9CA3AF;
+        }
     )");
 
     ui->searchPlainTextEdit->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);