diff --git a/web/templates/index.html b/web/templates/index.html
index 66abf194..a0cbeb14 100644
--- a/web/templates/index.html
+++ b/web/templates/index.html
@@ -70,36 +70,34 @@
                 <nav class="main-sidebar-nav">
                     <div class="nav-item" data-page="chat">
                         <div class="nav-item-content" data-title="对话" onclick="switchPage('chat')">
-                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
-                                <path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                                <path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"></path>
                             </svg>
                             <span>对话</span>
                         </div>
                     </div>
                     <div class="nav-item" data-page="tasks">
                         <div class="nav-item-content" data-title="任务管理" onclick="switchPage('tasks')">
-                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
-                                <path d="M13 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V9z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
-                                <polyline points="13 2 13 9 20 9" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
-                                <line x1="9" y1="13" x2="15" y2="13" stroke="currentColor" stroke-width="2" stroke-linecap="round"/>
-                                <line x1="9" y1="17" x2="15" y2="17" stroke="currentColor" stroke-width="2" stroke-linecap="round"/>
+                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                                <path d="M9 11l3 3L22 4"></path>
+                                <path d="M21 12v7a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11"></path>
                             </svg>
                             <span>任务管理</span>
                         </div>
                     </div>
                     <div class="nav-item" data-page="vulnerabilities">
                         <div class="nav-item-content" data-title="漏洞管理" onclick="switchPage('vulnerabilities')">
-                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
-                                <path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
-                                <path d="M9 12l2 2 4-4" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                                <path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z"></path>
+                                <path d="M9 12l2 2 4-4"></path>
                             </svg>
                             <span>漏洞管理</span>
                         </div>
                     </div>
                     <div class="nav-item nav-item-has-submenu" data-page="mcp">
                         <div class="nav-item-content" data-title="MCP" onclick="toggleSubmenu('mcp')">
-                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
-                                <path d="M3 12h4l3 8 4-16 3 8h4" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                                <path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z"></path>
                             </svg>
                             <span>MCP</span>
                             <svg class="submenu-arrow" width="16" height="16" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
@@ -117,10 +115,9 @@
                     </div>
                     <div class="nav-item nav-item-has-submenu" data-page="knowledge">
                         <div class="nav-item-content" data-title="知识" onclick="toggleSubmenu('knowledge')">
-                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
-                                <path d="M4 19.5A2.5 2.5 0 0 1 6.5 17H20" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
-                                <path d="M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
-                                <path d="M10 7h6M10 11h6M10 15h4" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                                <path d="M2 3h6a4 4 0 0 1 4 4v14a3 3 0 0 0-3-3H2z"></path>
+                                <path d="M22 3h-6a4 4 0 0 0-4 4v14a3 3 0 0 1 3-3h7z"></path>
                             </svg>
                             <span>知识</span>
                             <svg class="submenu-arrow" width="16" height="16" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
@@ -138,11 +135,11 @@
                     </div>
                     <div class="nav-item nav-item-has-submenu" data-page="roles">
                         <div class="nav-item-content" data-title="角色" onclick="toggleSubmenu('roles')">
-                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
-                                <path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
-                                <circle cx="9" cy="7" r="4" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
-                                <path d="M23 21v-2a4 4 0 0 0-3-3.87" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
-                                <path d="M16 3.13a4 4 0 0 1 0 7.75" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                                <path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"></path>
+                                <circle cx="9" cy="7" r="4"></circle>
+                                <path d="M23 21v-2a4 4 0 0 0-3-3.87"></path>
+                                <path d="M16 3.13a4 4 0 0 1 0 7.75"></path>
                             </svg>
                             <span>角色</span>
                             <svg class="submenu-arrow" width="16" height="16" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
@@ -157,9 +154,9 @@
                     </div>
                     <div class="nav-item" data-page="settings">
                         <div class="nav-item-content" data-title="系统设置" onclick="switchPage('settings')">
-                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
-                                <path d="M12 15a3 3 0 1 0 0-6 3 3 0 0 0 0 6z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
-                                <path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-2 2 2 2 0 0 1-2-2v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1-2-2 2 2 0 0 1 2-2h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 2-2 2 2 0 0 1 2 2v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 2 2 2 2 0 0 1-2 2h-.09a1.65 1.65 0 0 0-1.51 1z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                                <circle cx="12" cy="12" r="3"></circle>
+                                <path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-2 2 2 2 0 0 1-2-2v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1-2-2 2 2 0 0 1 2-2h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 2-2 2 2 0 0 1 2 2v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 2 2 2 2 0 0 1-2 2h-.09a1.65 1.65 0 0 0-1.51 1z"></path>
                             </svg>
                             <span>系统设置</span>
                         </div>