style(PdfViewer): 修改缩放按钮和页码跳转的背景颜色

将放大缩小按钮的图标颜色改为绿色(#4caf50)，页码跳转背景透明度调整为50%

 <!--
  * @Date: 2025-01-21
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-10-22 17:40:14
+ * @LastEditTime: 2025-10-27 14:15:25
  * @FilePath: /mlaj/src/components/ui/PdfViewer.vue
  * @Description: PDF预览组件 - 使用pdf-vue3库
 -->
@@ -66,7 +66,7 @@
                 <van-button class="zoom-btn zoom-close-btn" type="default" icon="cross" round @click="handleClose" />
                 <!-- <van-button class="zoom-btn zoom-in-btn" type="default" icon="plus" round @click="zoomIn" /> -->
                 <div class="zoom-btn flex items-center justify-center" @click="zoomIn">
-                    <font-awesome-icon icon="magnifying-glass-plus" class="text-xl ml-2 mr-2" style="color: #000;" />
+                    <font-awesome-icon icon="magnifying-glass-plus" class="text-xl ml-2 mr-2" style="color: #4caf50;" />
                 </div>
                 <!-- <font-awesome-icon icon="magnifying-glass-plus" class="text-2xl text-gray-600 ml-2 mr-2" @click="zoomIn" /> -->
                 <div class="page-jump" @click="focusPageInput">
@@ -85,7 +85,7 @@
                 </div>
                 <!-- <van-button class="zoom-btn zoom-out-btn" type="default" icon="minus" round @click="zoomOut" /> -->
                 <div class="zoom-btn flex items-center justify-center" @click="zoomOut">
-                    <font-awesome-icon icon="magnifying-glass-minus" class="text-xl ml-2 mr-2" style="color: #000;" />
+                    <font-awesome-icon icon="magnifying-glass-minus" class="text-xl ml-2 mr-2" style="color: #4caf50;" />
                 </div>
                 <van-button class="zoom-btn zoom-reset-btn" type="default" round @click="resetZoom">
                     <van-icon name="replay" size="16" />
@@ -1057,7 +1057,7 @@ const applyPinchZoom = (newZoom, centerX, centerY, container) => {
 }
 
 .page-jump:hover {
-    background: rgba(0, 0, 0, 0.8);
+    background: rgba(0, 0, 0, 0.5);
 }
 
 /* 错误状态样式 */