style: 添加自定义确认对话框样式，优化ManageListRemote.vue的过滤器布局与样式，更新课程管理相关功能以提升用户体验。

(cherry picked from commit a34f87410f)

src/assets/styles/index.scss

@@ -392,3 +392,99 @@ li{
     }
   }
 
+.custom-confirm-dialog {
+  max-width: 692px;
+  min-width: 692px;
+  min-height: 222px !important;
+  padding: 0px 0px 0px;
+  border-radius: 10px;
+  height: auto !important;
+
+  .el-message-box__header {
+    // padding: 0 0 16px 0;
+    padding: 2px 8px 2px 16px;
+    display: block;
+
+    .el-message-box__title {
+      font-size: 16px;
+      color: #000;
+      line-height: 32px;
+    }
+
+    .el-message-box__headerbtn {
+      top: 8px;
+      right: 10px;
+      .el-message-box__close {
+        font-size: 22px;
+        color: #b2b2b2;
+      }
+    }
+  }
+
+  .el-message-box__content {
+    padding: 0 0 28px 0;
+    margin-top: 30px;
+    .el-message-box__status {
+      margin-right: 14px;
+      font-size: 24px;
+      color: #e32e2e;
+    //   display: block;
+    }
+
+    .el-message-box__message {
+      margin-left: 0;
+      color: #000;
+      font-size: 16px;
+      line-height: 32px;
+      font-weight: normal;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      padding: 0 20px;
+      p{
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        .el-icon-warning-outline{
+            margin-right: 6px;
+            font-size: 18px;
+            color: #e32e2e;
+        }
+      }
+      
+    }
+  }
+
+  .el-message-box__btns {
+    padding: 0;
+    display: flex;
+    justify-content: flex-end;
+    padding-right: 20px;
+    margin-top: 40px;
+    padding-bottom: 20px;
+
+    .el-button {
+      min-width: 120px;
+      height: 40px;
+      font-size: 16px;
+      border-radius: 6px;
+      padding: 0 18px;
+    }
+
+    .el-button--default {
+      color: rgba(0, 0, 0, .2);
+      border-color: rgba(0, 0, 0, .1);
+      background-color: #FFFFFF;
+    }
+
+    .el-button--primary {
+      background-color: #3b7cff;
+      border-color: #3b7cff;
+      color: #fff;
+    }
+  }
+}
+
+.custom-message-dialog {
+
+}