style(ActivitiesCover): 更新主题颜色和调整页面高度

将硬编码的颜色值替换为主题颜色变量，并调整页面高度计算方式
更新按钮阴影和渐变颜色以匹配新的主题色

@@ -11,8 +11,8 @@
     top: 0;
     left: 0;
     width: 100vw;
-    // height: calc(100vh - 260rpx); // 减去底部区域的高度，确保背景图不被遮挡
-    height: calc(100vh); // 减去底部区域的高度，确保背景图不被遮挡
+    height: calc(100vh - 150rpx); // 减去底部区域的高度，确保背景图不被遮挡
+    // height: calc(100vh); // 减去底部区域的高度，确保背景图不被遮挡
     object-fit: cover;
     object-position: top center;
     z-index: 1;
@@ -129,26 +129,26 @@
     border-radius: 44rpx;
     font-size: 32rpx;
     font-weight: 600;
-    box-shadow: 0 8rpx 32rpx rgba(59, 130, 246, 0.5), 0 4rpx 16rpx rgba(0, 0, 0, 0.2);
+    box-shadow: 0 8rpx 32rpx rgba(84, 171, 174, 0.5), 0 4rpx 16rpx rgba(0, 0, 0, 0.2);
     backdrop-filter: blur(15rpx);
     -webkit-backdrop-filter: blur(15rpx);
     border: 1rpx solid rgba(255, 255, 255, 0.2);
 
     &:active {
         transform: translateY(2rpx);
-        box-shadow: 0 4rpx 16rpx rgba(59, 130, 246, 0.4), 0 2rpx 8rpx rgba(0, 0, 0, 0.2);
+        box-shadow: 0 4rpx 16rpx rgba(84, 171, 174, 0.4), 0 2rpx 8rpx rgba(0, 0, 0, 0.2);
     }
 
     &.nut-button--primary {
-        background: linear-gradient(135deg, rgba(24, 144, 255, 0.95) 0%, rgba(9, 109, 217, 0.95) 100%);
+        background: linear-gradient(135deg, rgba(84, 171, 174, 0.95) 0%, rgba(74, 151, 154, 0.95) 100%);
         border: 1rpx solid rgba(255, 255, 255, 0.3);
-        box-shadow: 0 8rpx 32rpx rgba(24, 144, 255, 0.4), 0 4rpx 16rpx rgba(0, 0, 0, 0.2);
+        box-shadow: 0 8rpx 32rpx rgba(84, 171, 174, 0.4), 0 4rpx 16rpx rgba(0, 0, 0, 0.2);
         color: white;
         text-shadow: 0 1rpx 2rpx rgba(0, 0, 0, 0.2);
 
         &:active {
             transform: translateY(2rpx);
-            box-shadow: 0 4rpx 16rpx rgba(24, 144, 255, 0.3), 0 2rpx 8rpx rgba(0, 0, 0, 0.2);
+            box-shadow: 0 4rpx 16rpx rgba(84, 171, 174, 0.3), 0 2rpx 8rpx rgba(0, 0, 0, 0.2);
         }
     }
 }

 <!--
  * @Date: 2022-09-19 14:11:06
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-15 15:21:47
+ * @LastEditTime: 2025-09-15 16:20:15
  * @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
 -->
@@ -46,7 +46,7 @@
         type="primary"
         size="large"
         class="join-button"
-        color="#3B82F6"
+        :color="THEME_COLORS.PRIMARY"
         :loading="isJoining"
         @click="checkFamilyStatusAndJoinActivity"
       >