diff --git a/WebSite/public/logo_square.png b/WebSite/public/logo_square.png
new file mode 100644
index 0000000..6b9ee7e
Binary files /dev/null and b/WebSite/public/logo_square.png differ
diff --git a/WebSite/src/App.tsx b/WebSite/src/App.tsx
index 0f57a99..260c8cd 100644
--- a/WebSite/src/App.tsx
+++ b/WebSite/src/App.tsx
@@ -9,7 +9,6 @@ import {
   Check, 
   Download, 
   Layers, 
-  ActivitySquare, 
   MonitorPlay, 
   Save, 
   LayoutDashboard, 
@@ -562,7 +561,7 @@ export default function App() {
     setIsResettingDemo(true);
     try {
       const data = await apiRequest('/api/demo/reset', { method: 'POST' }) as { items?: LibraryItem[] };
-      const items = data.items || [];
+      const items = data.items?.length ? data.items : await loadLibrary();
       setLibraryData(items);
       setSelectedLibraryId(items[0]?.id || '');
       setLibraryInfo(null);
@@ -976,8 +975,8 @@ export default function App() {
       <div className="w-screen h-screen bg-[#f1f5f9] flex items-center justify-center">
         <div className="w-[450px] bg-white p-10 rounded-2xl shadow-xl border border-slate-200">
           <div className="flex flex-col items-center mb-8">
-            <div className="w-16 h-16 bg-blue-600 rounded-xl flex items-center justify-center mb-4">
-              <ActivitySquare className="text-white w-9 h-9" />
+            <div className="w-20 h-20 rounded-2xl flex items-center justify-center mb-4 overflow-hidden">
+              <img src="/logo_square.png" alt="头颈CT变形平台" className="w-full h-full object-contain" />
             </div>
             <h1 className="text-xl font-bold text-slate-800 text-center">颅颈特定体位CT影像智慧变形平台</h1>
             <p className="text-slate-400 text-sm mt-2">头部CT变形平台</p>
@@ -1032,7 +1031,7 @@ export default function App() {
       {/* Sidebar */}
       <aside className={`${isSidebarCollapsed ? 'w-20' : 'w-72'} bg-white border-r p-6 flex flex-col shrink-0 transition-all duration-300 ease-in-out`}>
         <div className={`flex items-center ${isSidebarCollapsed ? 'justify-center' : 'gap-3'} mb-10 transition-all`}>
-          <ActivitySquare className="text-blue-600 shrink-0" size={28} />
+          <img src="/logo_square.png" alt="头颈CT变形平台" className="w-9 h-9 object-contain shrink-0" />
           {!isSidebarCollapsed && <h2 className="text-base font-bold tracking-tight whitespace-nowrap overflow-hidden">头颈CT变形平台</h2>}
         </div>
         
@@ -1053,8 +1052,17 @@ export default function App() {
                </div>
              )}
           </div>
-          <button onClick={handleLogout} className={`w-full flex items-center gap-3 px-4 py-3 text-slate-400 hover:text-red-500 text-sm transition-all ${isSidebarCollapsed ? 'justify-center px-0' : ''}`}>
-            <LogOut size={18} /> 
+          <button
+            onClick={handleLogout}
+            title="退出登录"
+            aria-label="退出登录"
+            className={`w-full flex items-center gap-3 text-sm transition-all ${
+              isSidebarCollapsed
+                ? 'justify-center w-10 h-10 mx-auto rounded-2xl bg-slate-50 text-slate-500 hover:bg-red-50 hover:text-red-500'
+                : 'px-4 py-3 text-slate-400 hover:text-red-500'
+            }`}
+          >
+            <LogOut size={isSidebarCollapsed ? 20 : 18} className="shrink-0" /> 
             {!isSidebarCollapsed && <span>退出登录</span>}
           </button>
         </div>
@@ -1079,12 +1087,6 @@ export default function App() {
                {currentPage === 'users' && '系统管理工作区'}
              </h3>
            </div>
-           <div className="flex items-center gap-6">
-              <div className="flex items-center gap-2 text-[10px] font-extrabold text-slate-400 uppercase tracking-tighter">
-                <div className="w-2 h-2 rounded-full bg-green-500 animate-pulse"></div>
-                算网协同系统 :: 稳定
-              </div>
-           </div>
         </header>
 
         <div className="flex-1 p-8 overflow-y-auto">
diff --git a/web_backend.py b/web_backend.py
index 1b957df..d2a3020 100644
--- a/web_backend.py
+++ b/web_backend.py
@@ -441,7 +441,7 @@ def reset_demo_environment():
     return {
         "ok": True,
         "message": "演示环境已恢复出厂设置。",
-        "items": list_library(),
+        "items": [record],
     }