style(ActivitiesCover): 调整积分规则说明的文本样式和透明度

将积分规则说明的文本大小从xs/sm调整为sm/base，并略微增加背景透明度

 <!--
  * @Date: 2022-09-19 14:11:06
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-25 10:41:54
+ * @LastEditTime: 2025-09-25 10:50:46
  * @FilePath: /lls_program/src/pages/ActivitiesCover/index.vue
  * @Description: 活动海报页面 - 展示活动信息并处理定位授权
 -->
@@ -26,11 +26,11 @@
     <!-- 底部按钮区域 -->
     <view class="bottom-section">
       <!-- 积分规则说明 -->
-      <view class="bg-blue-50 border border-blue-200 rounded-lg p-4 mb-4 opacity-85">
-        <text class="text-blue-500 text-sm font-medium block mb-2">积分规则说明：</text>
-        <text class="text-blue-500 text-xs leading-relaxed block mb-1" style="padding-left: 20rpx; text-indent: -20rpx;">• 打卡任意1关，视为参与，奖励1000积分</text>
-        <text class="text-blue-500 text-xs leading-relaxed block mb-1" style="padding-left: 20rpx; text-indent: -20rpx;">• 打卡任意7关，视为完成，奖励5000积分</text>
-        <text class="text-blue-500 text-xs leading-relaxed block mb-1" style="padding-left: 20rpx; text-indent: -20rpx;">• 不需要区分打卡点的先后次序</text>
+      <view class="bg-blue-50 border border-blue-200 rounded-lg p-4 mb-4 opacity-90">
+        <text class="text-blue-500 text-base font-medium block mb-2">积分规则说明：</text>
+        <text class="text-blue-500 text-sm leading-relaxed block mb-1" style="padding-left: 20rpx; text-indent: -20rpx;">• 打卡任意1关，视为参与，奖励1000积分</text>
+        <text class="text-blue-500 text-sm leading-relaxed block mb-1" style="padding-left: 20rpx; text-indent: -20rpx;">• 打卡任意7关，视为完成，奖励5000积分</text>
+        <text class="text-blue-500 text-sm leading-relaxed block mb-1" style="padding-left: 20rpx; text-indent: -20rpx;">• 不需要区分打卡点的先后次序</text>
       </view>
       <!-- 未授权定位提示 - 仅在用户点击参加活动且未授权时显示 -->
       <view v-if="showLocationPrompt && !hasLocationAuth && !locationError" class="location-tip" @click="retryGetLocation">