优化了样式，抽象出了 WXSS/JS 库

pages/fighter-msg/fighter-msg.wxml

@@ -215,14 +215,14 @@
 
       <!-- 弹窗底部按钮 -->
       <view class="modal-footer">
-        <view class="btn-group">
+        <view class="cbtn-group">
           <!-- 联系客服按钮（始终显示） -->
-          <view class="btn btn-kefu" bindtap="lianxiKefu">
+          <view class="cbtn cbtn-kefu" bindtap="lianxiKefu">
             <text>联系客服</text>
           </view>
           <!-- 申诉按钮（只有待处罚状态可点击） -->
-          <view 
-            class="btn {{ xuanzhongChufa.sqzhuangtai === 0 ? 'btn-shensu' : 'btn-shensu-disabled' }}"
+          <view
+            class="cbtn {{ xuanzhongChufa.sqzhuangtai === 0 ? 'cbtn-shensu' : 'cbtn-shensu-disabled' }}"
             bindtap="{{ xuanzhongChufa.sqzhuangtai === 0 ? 'openShensuModal' : '' }}"
           >
             <text>申诉</text>
@@ -299,11 +299,11 @@
         </view>
       </view>
       <view class="modal-footer">
-        <view class="btn-group">
-          <view class="btn btn-quxiao" bindtap="closeShensuModal">
+        <view class="cbtn-group">
+          <view class="cbtn cbtn-quxiao" bindtap="closeShensuModal">
             <text>取消</text>
           </view>
-          <view class="btn btn-queren" bindtap="submitShensu">
+          <view class="cbtn cbtn-queren" bindtap="submitShensu">
             <text>提交申诉</text>
           </view>
         </view>