diff --git a/app/Services/Installer.php b/app/Services/Installer.php
index 9f607d9..04b7014 100644
--- a/app/Services/Installer.php
+++ b/app/Services/Installer.php
@@ -87,27 +87,27 @@ class Installer
             [
                 'name' => '智能助手',
                 'prompt' => '你是一个全能的智能助手，善于回答各种问题，提供准确、有帮助的回答。',
-                'icon' => '🤖',
+                'icon' => 'A',
             ],
             [
                 'name' => '代码专家',
                 'prompt' => '你是一个专业的编程专家，精通多种编程语言和技术框架，擅长代码编写、调试和优化。',
-                'icon' => '💻',
+                'icon' => '</>',
             ],
             [
                 'name' => '翻译官',
                 'prompt' => '你是一个专业的翻译官，精通中文、英文、日文等多种语言，提供准确、流畅的翻译服务。',
-                'icon' => '🌐',
+                'icon' => 'T',
             ],
             [
                 'name' => '写作助手',
                 'prompt' => '你是一个专业的写作助手，擅长各类文体的写作，包括文章、报告、邮件、创意写作等。',
-                'icon' => '✍️',
+                'icon' => 'W',
             ],
             [
                 'name' => '数学家',
                 'prompt' => '你是一个数学专家，精通各领域的数学知识，善于解答数学问题并提供详细的解题步骤。',
-                'icon' => '🔢',
+                'icon' => 'M',
             ],
         ];
 
diff --git a/app/Views/chat.php b/app/Views/chat.php
index cd8189d..9f2ad22 100644
--- a/app/Views/chat.php
+++ b/app/Views/chat.php
@@ -13,7 +13,9 @@
     <div class="chat-main">
         <!-- 顶部工具栏 -->
         <div class="toolbar">
-            <button class="toggle-sidebar" onclick="toggleSidebar()" title="切换侧边栏">☰</button>
+            <button class="toggle-sidebar" onclick="toggleSidebar()" title="切换侧边栏">
+                <svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round"><path d="M3 6h18M3 12h18M3 18h18"/></svg>
+            </button>
             
             <select id="providerSelect" onchange="onProviderChange()">
                 <option value="">选择供应商</option>
@@ -36,7 +38,10 @@
                 <!-- 由 loadPersonalities() 动态填充 -->
             </select>
             
-            <a href="/config.php" class="btn btn-secondary btn-sm" style="margin-left:auto;">⚙️ 设置</a>
+            <a href="/config.php" class="btn btn-secondary btn-sm" style="margin-left:auto;">
+                <svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="vertical-align:-2px;margin-right:4px;"><circle cx="12" cy="12" r="3"/><path d="M12 1v2M12 21v2M4.22 4.22l1.42 1.42M18.36 18.36l1.42 1.42M1 12h2M21 12h2M4.22 19.78l1.42-1.42M18.36 5.64l1.42-1.42"/></svg>
+                设置
+            </a>
         </div>
 
         <!-- 消息列表 -->
@@ -51,7 +56,9 @@
         <div class="input-area">
             <div class="file-preview" id="filePreview"></div>
             <div class="input-wrapper">
-                <button id="uploadBtn" title="上传文件" style="background:none;border:none;color:var(--text-secondary);cursor:pointer;font-size:18px;">📎</button>
+                <button id="uploadBtn" title="上传文件" style="background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:4px;">
+                    <svg viewBox="0 0 24 24" width="18" height="18" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21.44 11.05l-9.19 9.19a6 6 0 01-8.49-8.49l9.19-9.19a4 4 0 015.66 5.66l-9.2 9.19a2 2 0 01-2.83-2.83l8.49-8.48"/></svg>
+                </button>
                 <textarea id="messageInput" rows="1" placeholder="输入消息，Ctrl+Enter 发送..."></textarea>
                 <button id="sendBtn">发送</button>
             </div>
@@ -129,7 +136,7 @@ async function loadPersonalities() {
         personalitiesData.forEach(p => {
             const option = document.createElement('option');
             option.value = p.id;
-            option.textContent = (p.icon || '🤖') + ' ' + p.name;
+            option.textContent = (p.icon ? p.icon + ' ' : '') + p.name;
             select.appendChild(option);
         });
     } catch (err) {
diff --git a/app/Views/config.php b/app/Views/config.php
index b3a2dda..1d475c6 100644
--- a/app/Views/config.php
+++ b/app/Views/config.php
@@ -1,7 +1,13 @@
 <div class="config-container">
     <div class="config-header">
-        <h1>⚙️ 系统配置</h1>
-        <a href="/chat.php" class="btn btn-secondary">← 返回聊天</a>
+        <h1>
+            <svg viewBox="0 0 24 24" width="22" height="22" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="vertical-align:-4px;margin-right:8px;"><circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.65 1.65 0 00.33 1.82l.06.06a2 2 0 010 2.83 2 2 0 01-2.83 0l-.06-.06a1.65 1.65 0 00-1.82-.33 1.65 1.65 0 00-1 1.51V21a2 2 0 01-4 0v-.09A1.65 1.65 0 009 19.4a1.65 1.65 0 00-1.82.33l-.06.06a2 2 0 01-2.83-2.83l.06-.06A1.65 1.65 0 004.68 15a1.65 1.65 0 00-1.51-1H3a2 2 0 010-4h.09A1.65 1.65 0 004.6 9a1.65 1.65 0 00-.33-1.82l-.06-.06a2 2 0 012.83-2.83l.06.06A1.65 1.65 0 009 4.68a1.65 1.65 0 001-1.51V3a2 2 0 014 0v.09a1.65 1.65 0 001 1.51 1.65 1.65 0 001.82-.33l.06-.06a2 2 0 012.83 2.83l-.06.06A1.65 1.65 0 0019.4 9a1.65 1.65 0 001.51 1H21a2 2 0 010 4h-.09a1.65 1.65 0 00-1.51 1z"/></svg>
+            系统配置
+        </h1>
+        <a href="/chat.php" class="btn btn-secondary">
+            <svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="vertical-align:-2px;margin-right:4px;"><path d="M19 12H5M12 19l-7-7 7-7"/></svg>
+            返回聊天
+        </a>
     </div>
 
     <!-- 供应商管理 -->
@@ -25,8 +31,8 @@
             <input type="text" id="newPersonalityName" placeholder="人格名称">
         </div>
         <div class="form-group">
-            <label>图标（Emoji）</label>
-            <input type="text" id="newPersonalityIcon" placeholder="如：🤖" maxlength="2">
+            <label>图标</label>
+            <input type="text" id="newPersonalityIcon" placeholder="如：A" maxlength="2">
         </div>
         <div class="form-group">
             <label>提示词</label>
@@ -188,7 +194,7 @@ const ConfigPage = {
         list.innerHTML = this.personalities.map(p => `
             <div style="display:flex;justify-content:space-between;align-items:center;padding:12px;background:var(--bg-secondary);border-radius:var(--radius);margin-bottom:8px;">
                 <div>
-                    <span>${p.icon || '🤖'} ${this.escapeHtml(p.name)}</span>
+                    <span>${p.icon ? '<span style="margin-right:4px;">' + this.escapeHtml(p.icon) + '</span>' : ''}${this.escapeHtml(p.name)}</span>
                     ${p.is_preset ? '<span style="color:var(--warning);font-size:12px;margin-left:8px;">预设</span>' : '<span style="color:var(--success);font-size:12px;margin-left:8px;">自定义</span>'}
                 </div>
                 ${!p.is_preset ? '<button class="btn btn-danger btn-sm" onclick="ConfigPage.deletePersonality(' + p.id + ')">删除</button>' : ''}
diff --git a/app/Views/login.php b/app/Views/login.php
index c9b54bf..dd66bf4 100644
--- a/app/Views/login.php
+++ b/app/Views/login.php
@@ -1,6 +1,14 @@
 <div class="login-container">
     <div class="login-card">
-        <h1>🤖 AI Chat</h1>
+        <div class="login-logo">
+            <svg class="logo-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
+                <rect x="3" y="4" width="18" height="12" rx="3"/>
+                <circle cx="9" cy="10" r="1.5" fill="currentColor" stroke="none"/>
+                <circle cx="15" cy="10" r="1.5" fill="currentColor" stroke="none"/>
+                <path d="M8 16v2M16 16v2M12 16v3"/>
+            </svg>
+            <h1>AI Chat</h1>
+        </div>
         <div id="loginError" class="alert alert-error" style="display:none;"></div>
         <form id="loginForm">
             <div class="form-group">
diff --git a/assets/css/style.css b/assets/css/style.css
index 243e69f..99495ce 100644
--- a/assets/css/style.css
+++ b/assets/css/style.css
@@ -37,22 +37,36 @@ body {
     align-items: center;
     min-height: 100vh;
     padding: 20px;
+    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
 }
 
 .login-card {
     background: var(--bg-card);
-    border-radius: var(--radius);
-    padding: 40px;
+    border-radius: 12px;
+    padding: 48px 40px;
     width: 100%;
-    max-width: 400px;
-    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
+    max-width: 420px;
+    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
+    border: 1px solid var(--border-color);
 }
 
-.login-card h1 {
+.login-logo {
     text-align: center;
-    margin-bottom: 30px;
+    margin-bottom: 36px;
+}
+
+.login-logo .logo-icon {
+    width: 48px;
+    height: 48px;
+    color: var(--primary);
+    margin-bottom: 12px;
+}
+
+.login-logo h1 {
     font-size: 24px;
     color: var(--primary);
+    font-weight: 600;
+    letter-spacing: 0.5px;
 }
 
 /* 安装向导样式 */
@@ -62,6 +76,10 @@ body {
     padding: 0 20px;
 }
 
+.install-container h1 svg {
+    color: var(--primary);
+}
+
 .step-indicator {
     display: flex;
     justify-content: space-between;
@@ -92,14 +110,16 @@ body {
 
 /* 通用表单样式 */
 .form-group {
-    margin-bottom: 16px;
+    margin-bottom: 18px;
 }
 
 .form-group label {
     display: block;
     margin-bottom: 6px;
-    font-size: 14px;
+    font-size: 13px;
+    font-weight: 500;
     color: var(--text-secondary);
+    letter-spacing: 0.3px;
 }
 
 .form-group input,
@@ -124,14 +144,18 @@ body {
 
 /* 按钮 */
 .btn {
-    display: inline-block;
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
     padding: 10px 20px;
     border: none;
     border-radius: var(--radius);
     font-size: 14px;
+    font-weight: 500;
     cursor: pointer;
-    transition: all 0.3s;
+    transition: all 0.2s ease;
     text-decoration: none;
+    line-height: 1.4;
 }
 
 .btn-primary {
@@ -141,6 +165,12 @@ body {
 
 .btn-primary:hover {
     background: var(--primary-hover);
+    transform: translateY(-1px);
+    box-shadow: 0 2px 8px rgba(74, 144, 217, 0.3);
+}
+
+.btn-primary:active {
+    transform: translateY(0);
 }
 
 .btn-secondary {
@@ -149,18 +179,27 @@ body {
     border: 1px solid var(--border-color);
 }
 
+.btn-secondary:hover {
+    border-color: var(--primary);
+    color: var(--primary);
+}
+
 .btn-danger {
     background: var(--danger);
     color: white;
 }
 
+.btn-danger:hover {
+    opacity: 0.9;
+}
+
 .btn-sm {
-    padding: 6px 12px;
+    padding: 6px 14px;
     font-size: 12px;
 }
 
 .btn-block {
-    display: block;
+    display: flex;
     width: 100%;
     text-align: center;
 }
@@ -168,7 +207,7 @@ body {
 .btn-group {
     display: flex;
     gap: 10px;
-    margin-top: 20px;
+    margin-top: 24px;
     justify-content: flex-end;
 }
 
@@ -178,6 +217,7 @@ body {
     border-radius: var(--radius);
     margin-bottom: 16px;
     font-size: 14px;
+    line-height: 1.5;
 }
 
 .alert-error {
@@ -203,19 +243,34 @@ body {
     display: flex;
     justify-content: space-between;
     align-items: center;
-    margin-bottom: 30px;
+    margin-bottom: 32px;
+}
+
+.config-header h1 {
+    display: flex;
+    align-items: center;
+    font-size: 22px;
+    font-weight: 600;
+}
+
+.config-header h1 svg {
+    color: var(--primary);
 }
 
 .config-section {
     background: var(--bg-card);
-    border-radius: var(--radius);
-    padding: 24px;
+    border-radius: 12px;
+    padding: 28px;
     margin-bottom: 24px;
+    border: 1px solid var(--border-color);
 }
 
 .config-section h2 {
-    margin-bottom: 16px;
-    font-size: 18px;
+    margin-bottom: 20px;
+    font-size: 17px;
+    font-weight: 600;
+    padding-bottom: 12px;
+    border-bottom: 1px solid var(--border-color);
 }
 
 /* 响应式 */
diff --git a/assets/js/chat.js b/assets/js/chat.js
index 4a19561..63a4ee5 100644
--- a/assets/js/chat.js
+++ b/assets/js/chat.js
@@ -57,7 +57,7 @@ const ChatManager = {
             } else {
                 let html = `<div class="message assistant">`;
                 if (msg.thinking_content) {
-                    html += `<div class="thinking-toggle" onclick="this.nextElementSibling.classList.toggle('expanded')">💭 思考过程 ▾</div>`;
+                    html += `<div class="thinking-toggle" onclick="this.nextElementSibling.classList.toggle('expanded')">思考过程 ▾</div>`;
                     html += `<div class="thinking-content">${MarkdownRenderer.render(msg.thinking_content)}</div>`;
                 }
                 html += `<div class="markdown-body">${MarkdownRenderer.render(msg.content)}</div>`;
@@ -252,10 +252,10 @@ const ChatManager = {
         if (!toggle) {
             toggle = document.createElement('div');
             toggle.className = 'thinking-toggle expanded';
-            toggle.textContent = '💭 思考过程 ▾';
+            toggle.textContent = '思考过程 ▾';
             toggle.onclick = function() {
                 container.classList.toggle('expanded');
-                this.textContent = container.classList.contains('expanded') ? '💭 思考过程 ▴' : '💭 思考过程 ▾';
+                this.textContent = container.classList.contains('expanded') ? '思考过程 ▴' : '思考过程 ▾';
             };
             el.insertBefore(toggle, el.firstChild);
         }
@@ -279,7 +279,7 @@ const ChatManager = {
         const container = document.getElementById('messagesContainer');
         const el = document.createElement('div');
         el.className = 'message assistant';
-        el.innerHTML = `<div class="alert alert-error">❌ ${this.escapeHtml(message)} <button class="btn btn-sm btn-secondary" onclick="ChatManager.retryLast()">重试</button></div>`;
+        el.innerHTML = `<div class="alert alert-error">错误: ${this.escapeHtml(message)} <button class="btn btn-sm btn-secondary" onclick="ChatManager.retryLast()">重试</button></div>`;
         container.appendChild(el);
         container.scrollTop = container.scrollHeight;
     },
diff --git a/assets/js/upload.js b/assets/js/upload.js
index 401ff14..b103f75 100644
--- a/assets/js/upload.js
+++ b/assets/js/upload.js
@@ -39,7 +39,7 @@ const UploadManager = {
         
         preview.innerHTML = this.files.map((f, i) => `
             <div class="file-preview-item">
-                <span>📎 ${this.escapeHtml(f.name)}</span>
+                <span>${this.escapeHtml(f.name)}</span>
                 <span class="remove-file" onclick="UploadManager.removeFile(${i})">×</span>
             </div>
         `).join('');
diff --git a/public/install.php b/public/install.php
index 33d4cd1..7128621 100644
--- a/public/install.php
+++ b/public/install.php
@@ -28,7 +28,10 @@ if (file_exists($configFile)) {
 </head>
 <body>
     <div class="install-container">
-        <h1>🤖 AI Chat 安装向导</h1>
+        <h1>
+            <svg viewBox="0 0 24 24" width="28" height="28" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" style="vertical-align:-6px;margin-right:10px;"><rect x="3" y="4" width="18" height="12" rx="3"/><circle cx="9" cy="10" r="1.5" fill="currentColor" stroke="none"/><circle cx="15" cy="10" r="1.5" fill="currentColor" stroke="none"/><path d="M8 16v2M16 16v2M12 16v3"/></svg>
+            AI Chat 安装向导
+        </h1>
         
         <!-- 步骤指示器 -->
         <ul class="step-indicator">
@@ -161,7 +164,7 @@ if (file_exists($configFile)) {
             container.innerHTML = checks.map(c => `
                 <div class="check-item">
                     <span>${c.name}</span>
-                    <span class="status ${c.pass ? 'pass' : 'fail'}">${c.pass ? '✓ 通过' : '✗ 未通过'}</span>
+                    <span class="status ${c.pass ? 'pass' : 'fail'}">${c.pass ? '通过' : '未通过'}</span>
                 </div>
             `).join('');
         },
@@ -317,7 +320,7 @@ if (file_exists($configFile)) {
                 const data = await response.json();
                 
                 if (data.success) {
-                    result.innerHTML = '<div class="alert alert-success">✓ 安装成功！正在跳转到登录页...</div>';
+                    result.innerHTML = '<div class="alert alert-success">安装成功！正在跳转到登录页...</div>';
                     setTimeout(() => { window.location.href = '/login.php'; }, 2000);
                 } else {
                     result.innerHTML = '<div class="alert alert-error">安装失败: ' + data.message + '</div>';