优化界面；修复异常

templates/assets/css/main.css

@@ -6485,7 +6485,7 @@ a#listree-click.current,
     height: 100dvh;
     justify-content: center;
     align-items: center;
-    background-color: rgba(0, 0, 0, 0.1);
+    background-color: rgba(0, 0, 0, 0.5);
     z-index: 9999;
     box-sizing: border-box;
     padding: 20px;
@@ -6985,6 +6985,8 @@ a#listree-click.current,
 }
 
 .common-fixed-bg {
+    position: relative;
+    z-index: 0;
     background-size: cover;
     background-attachment: fixed;
     background-position: center center;
@@ -6994,6 +6996,22 @@ a#listree-click.current,
     padding: 0;
 }
 
+.fixed-background-layer {
+    position: fixed;
+    z-index: -1;
+    inset: 0;
+    background-position: center center;
+    background-repeat: no-repeat;
+    background-size: cover;
+    opacity: 0;
+    pointer-events: none;
+    transition: opacity .6s ease;
+}
+
+.fixed-background-layer.is-visible {
+    opacity: 1;
+}
+
 /* 侧边栏订阅 */
 .subscribe-widget {
     padding: 16px;