design: 设计稿去渐变——头像圆统一纯色 #6366F1

design-refs/mockup/course-shelf.html

@@ -79,7 +79,7 @@
   .topbar .menu span.active { color: #ffffff; font-weight: 600; }
   .topbar .ava {
     width: 24px; height: 24px; border-radius: 50%;
-    background: linear-gradient(135deg, #6366f1, #ec4899);
+    background: #6366f1;
     display: flex; align-items: center; justify-content: center;
     color: #fff; font-size: 11px; font-weight: 700;
   }
@@ -231,7 +231,7 @@
   .cover .bandtop .logo { color: #fff; font-weight: 800; font-size: 15px; }
   .cover .bandtop .menu { display: flex; gap: 24px; margin: 0 auto; }
   .cover .bandtop .menu .active { color: #fff; }
-  .cover .bandtop .ava { width: 26px; height: 26px; border-radius: 50%; background: linear-gradient(135deg,#6366f1,#ec4899); }
+  .cover .bandtop .ava { width: 26px; height: 26px; border-radius: 50%; background: #6366f1; }
 </style>
 </head>
 <body>