Update custom.css

custom.css

@@ -27,4 +27,31 @@ WynGPT - custom.css (final optimized + enlarged settings popup)
 html.dark .tippy-box, :root.dark .tippy-box {
   background: rgba(0,0,0,.5) !important;
   backdrop-filter: blur(10px) !important; -webkit-backdrop-filter: blur(10px) !important;
-  color: #fff !important; border: 1px solid rgba(255,255,255,.1) !important;
+  color: #fff !important; border: 1px solid rgba(255,255,255,.1) !important;
+  /* Ẩn text cũ "WynGPT (Open WebUI)" và "Open WebUI" */
+#sidebar-webui-name,
+[title="WynGPT (Open WebUI)"],
+[content="WynGPT (Open WebUI)"],
+[title="Open WebUI"],
+[content="Open WebUI"] {
+  color: transparent !important;  /* Ẩn text gốc */
+  position: relative;
+}
+
+/* Hiển thị lại chữ "WynGPT" */
+#sidebar-webui-name::after,
+[title="WynGPT (Open WebUI)"]::after,
+[content="WynGPT (Open WebUI)"]::after,
+[title="Open WebUI"]::after,
+[content="Open WebUI"]::after {
+  content: "WynGPT";
+  color: inherit;
+  position: absolute;
+  left: 0;
+  top: 0;
+}
+
+/* Nếu muốn thay cả trong thẻ <title> hiển thị ở tab trình duyệt */
+head > title::after {
+  content: "WynGPT";
+}