style(SingerDetail): 优化歌手详情页面样式

- 调整页面布局和 padding
- 更新背景颜色和 border-radius
- 添加 box-shadow 提升视觉效果
- 优化 singer-info 和 singer-tabs样式

music-qianduan/src/views/SingerDetail.vue

@@ -431,17 +431,19 @@ onUnmounted(() => {
 
 <style scoped>
 .singer-detail-container {
-  padding: 0;
-  height: 100%;
-  background-color: #fff;
-  border-radius: 8px;
+  padding: 20px;
+  min-height: calc(100vh - 140px);
+  background-color: transparent;
+  border-radius: 15px;
 }
 
 .singer-info {
   display: flex;
   margin-bottom: 30px;
-  padding: 20px;
-  border-bottom: 1px solid #eee;
+  padding: 30px;
+  background-color: #fff;
+  border-radius: 12px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
 }
 
 .singer-avatar {
@@ -518,8 +520,11 @@ onUnmounted(() => {
 }
 
 .singer-tabs {
-  margin: 0 20px 30px;
+  margin: 0 0 30px;
   padding: 20px;
+  background-color: #fff;
+  border-radius: 12px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
 }
 
 .song-cover {