feat: 底部样式优化

@@ -207,6 +207,7 @@
 	"tabBar": {
 		"color": "rgba(0,0,0,0.9)",
 		"selectedColor": "#3D48A3",
+		"backgroundColor": "#ffffff",
 		"borderStyle": "white",
 		"list": [{
 			"pagePath": "pages/index",

@@ -3,4 +3,12 @@
 // color-ui
 @import "@/static/scss/colorui.css";
 // iconfont
-@import "@/static/font/iconfont.css";
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+@import "@/static/font/iconfont.css";
+
+/* TabBar 顶部分隔线（H5 专用覆盖）：用阴影替代 borderStyle 线条 */
+/* #ifdef H5 */
+.uni-tabbar {
+  box-shadow: inset 0px 1px 0px 0px #E7E7E7;
+  border-top: none;
+}
+/* #endif */
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