From 7803c46b96ef615bca1d63c880902bfe869eeaad Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Fri, 17 Jul 2026 17:28:25 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=E5=8A=9F=E8=83=BD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 frontend/package-lock.json                    |   27 +
 frontend/package.json                         |    1 +
 frontend/src/App.vue                          |    2 +
 frontend/src/api/index.js                     |   59 +-
 frontend/src/assets/main.css                  |  119 +-
 frontend/src/components/ChatInput.vue         | 1623 +++++++++++++++--
 frontend/src/components/ChatSidebar.vue       |  342 ++--
 frontend/src/components/MessageItem.vue       |  334 +++-
 frontend/src/components/MessageList.vue       |  362 +++-
 .../src/components/NotificationCenter.vue     |  292 +++
 frontend/src/router/index.js                  |    2 +-
 frontend/src/stores/auth.js                   |   43 +-
 frontend/src/stores/chat.js                   |   19 +-
 frontend/src/stores/notification.js           |   45 +
 frontend/src/stores/settings.js               |    8 +-
 frontend/src/utils/errorPresentation.js       |  126 ++
 frontend/src/utils/guestSession.js            |   17 +
 frontend/src/views/ChatView.vue               |  137 +-
 18 files changed, 3118 insertions(+), 440 deletions(-)
 create mode 100644 frontend/src/components/NotificationCenter.vue
 create mode 100644 frontend/src/stores/notification.js
 create mode 100644 frontend/src/utils/errorPresentation.js
 create mode 100644 frontend/src/utils/guestSession.js

diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 05cc02e..bb6c89a 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -8,6 +8,7 @@
       "name": "ai-chat-member",
       "version": "1.0.0",
       "dependencies": {
+        "@tabler/icons-vue": "^3.45.0",
         "axios": "^1.7.9",
         "dompurify": "^3.2.4",
         "highlight.js": "^11.11.1",
@@ -865,6 +866,32 @@
         "win32"
       ]
     },
+    "node_modules/@tabler/icons": {
+      "version": "3.45.0",
+      "resolved": "https://registry.npmjs.org/@tabler/icons/-/icons-3.45.0.tgz",
+      "integrity": "sha512-jiATwV8+zGYLTZ7gMLGivCic+KtsMZXcDmufIG8umlLxoHhI6902hGYIEt0Oa9Y9SXblNzUlrisHm5jOFMxOQA==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/codecalm"
+      }
+    },
+    "node_modules/@tabler/icons-vue": {
+      "version": "3.45.0",
+      "resolved": "https://registry.npmjs.org/@tabler/icons-vue/-/icons-vue-3.45.0.tgz",
+      "integrity": "sha512-Q/cmDsx0zrzBScIL6Xxwevg7JqvkrteFW2R+NGTN9pwOrgJMzBLhyz/7ONvktjuwDn6eUKhFSM66CNAR8u3tRw==",
+      "license": "MIT",
+      "dependencies": {
+        "@tabler/icons": "3.45.0"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/codecalm"
+      },
+      "peerDependencies": {
+        "vue": ">=3.0.1"
+      }
+    },
     "node_modules/@types/estree": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index f8927a5..d23ba6f 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -9,6 +9,7 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "@tabler/icons-vue": "^3.45.0",
     "axios": "^1.7.9",
     "dompurify": "^3.2.4",
     "highlight.js": "^11.11.1",
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index d372e96..b799c50 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -1,6 +1,8 @@
 <template>
   <router-view />
+  <NotificationCenter />
 </template>
 
 <script setup>
+import NotificationCenter from '@/components/NotificationCenter.vue'
 </script>
diff --git a/frontend/src/api/index.js b/frontend/src/api/index.js
index a4ab705..b11e6e4 100644
--- a/frontend/src/api/index.js
+++ b/frontend/src/api/index.js
@@ -1,10 +1,34 @@
 import axios from 'axios'
+import { getGuestKey } from '@/utils/guestSession'
 
 const api = axios.create({
   baseURL: '/api',
   timeout: 60000
 })
 
+let guestRenewal = null
+
+async function renewGuestSession() {
+  const guestKey = getGuestKey()
+  if (!guestKey) throw new Error('游客身份已失效')
+
+  if (!guestRenewal) {
+    guestRenewal = axios.post('/api/auth/guest', { guest_key: guestKey })
+      .then(res => {
+        const data = res.data?.data
+        if (!data?.token) throw new Error('游客身份续期失败')
+        localStorage.setItem('token', data.token)
+        localStorage.setItem('auth_type', 'guest')
+        return data.token
+      })
+      .finally(() => {
+        guestRenewal = null
+      })
+  }
+
+  return guestRenewal
+}
+
 api.interceptors.request.use(config => {
   const token = localStorage.getItem('token')
   if (token) {
@@ -15,20 +39,49 @@ api.interceptors.request.use(config => {
 
 api.interceptors.response.use(
   res => res,
-  err => {
+  async err => {
     if (axios.isCancel(err)) {
       return Promise.reject(err)
     }
 
-    const message = err.response?.data?.message || '请求失败'
+    const message = err.response?.data?.message || err.message || '请求失败'
     if (err.response?.status === 401) {
+      const original = err.config || {}
+      const authType = localStorage.getItem('auth_type')
+      const requestUrl = String(original.url || '')
+      const isPublicAuthRequest = ['/auth/login', '/auth/register', '/auth/guest']
+        .some(path => requestUrl.includes(path))
+
+      if (isPublicAuthRequest) {
+        const wrapped = new Error(message)
+        wrapped.code = err.code
+        wrapped.status = 401
+        wrapped.detail = err.response?.data?.detail || ''
+        return Promise.reject(wrapped)
+      }
+
+      if (authType === 'guest' && !original._guestRetry) {
+        original._guestRetry = true
+        try {
+          const token = await renewGuestSession()
+          original.headers = original.headers || {}
+          original.headers.Authorization = `Bearer ${token}`
+          return api(original)
+        } catch {
+          // Fall through so the page can present a useful retry state.
+        }
+      }
+
       localStorage.removeItem('token')
-      if (!window.location.pathname.includes('/login')) {
+      localStorage.removeItem('auth_type')
+      if (authType === 'account' && !window.location.pathname.includes('/login')) {
         window.location.href = '/login'
       }
     }
     const wrapped = new Error(message)
     wrapped.code = err.code
+    wrapped.status = err.response?.status || null
+    wrapped.detail = err.response?.data?.detail || ''
     return Promise.reject(wrapped)
   }
 )
diff --git a/frontend/src/assets/main.css b/frontend/src/assets/main.css
index 9274b24..1225f64 100644
--- a/frontend/src/assets/main.css
+++ b/frontend/src/assets/main.css
@@ -1,22 +1,29 @@
-@import 'highlight.js/styles/github-dark.css';
+@import 'highlight.js/styles/github.css';
 
 :root {
-  --bg-primary: #212121;
-  --bg-secondary: #171717;
-  --bg-tertiary: #2f2f2f;
-  --bg-hover: #3a3a3a;
-  --text-primary: #ececec;
-  --text-secondary: #b4b4b4;
-  --text-muted: #8e8e8e;
-  --accent: #10a37f;
-  --accent-hover: #0d8a6a;
-  --border: #3a3a3a;
-  --danger: #ef4444;
-  --sidebar-width: 260px;
-  --header-height: 56px;
-  --input-max-width: 768px;
-  --radius: 12px;
-  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
+  --bg-primary: #f5f7fb;
+  --bg-secondary: #ffffff;
+  --bg-tertiary: #f8fafc;
+  --bg-hover: #eef3f9;
+  --bg-soft: #f2f5f8;
+  --text-primary: #152033;
+  --text-secondary: #526077;
+  --text-muted: #7d899b;
+  --accent: #2d66da;
+  --accent-hover: #2458c4;
+  --accent-soft: #edf4ff;
+  --border: #e1e7ef;
+  --border-strong: #d4dce7;
+  --danger: #dc4c4c;
+  --sidebar-width: 268px;
+  --header-height: 66px;
+  --input-max-width: 920px;
+  --content-max-width: 1040px;
+  --radius: 18px;
+  --radius-sm: 12px;
+  --shadow: 0 18px 50px rgba(38, 59, 92, 0.08);
+  --shadow-soft: 0 8px 24px rgba(38, 59, 92, 0.06);
+  --shadow-composer: 0 14px 38px rgba(38, 59, 92, 0.09);
 }
 
 * {
@@ -27,10 +34,16 @@
 
 html, body, #app {
   height: 100%;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+  min-height: 100dvh;
+  font-family: "Microsoft YaHei UI", "PingFang SC", "Segoe UI", sans-serif;
   background: var(--bg-primary);
   color: var(--text-primary);
   -webkit-font-smoothing: antialiased;
+  text-rendering: optimizeLegibility;
+}
+
+body {
+  overflow: hidden;
 }
 
 a {
@@ -46,7 +59,16 @@ button {
   font: inherit;
 }
 
-input, textarea {
+button:focus-visible,
+a:focus-visible,
+select:focus-visible,
+textarea:focus-visible,
+input:focus-visible {
+  outline: 2px solid rgba(45, 102, 218, 0.72);
+  outline-offset: 2px;
+}
+
+input, textarea, select {
   font: inherit;
   color: inherit;
   background: transparent;
@@ -54,47 +76,55 @@ input, textarea {
   outline: none;
 }
 
-/* Scrollbar */
 ::-webkit-scrollbar {
   width: 6px;
 }
+
 ::-webkit-scrollbar-track {
   background: transparent;
 }
+
 ::-webkit-scrollbar-thumb {
-  background: var(--bg-hover);
-  border-radius: 3px;
+  background: #ced7e3;
+  border-radius: 999px;
 }
 
-/* Buttons */
 .btn {
   display: inline-flex;
   align-items: center;
   justify-content: center;
   gap: 8px;
   padding: 10px 20px;
-  border-radius: 8px;
+  border-radius: 999px;
   font-size: 14px;
   font-weight: 500;
-  transition: all 0.2s;
+  transition: color 0.16s ease, background 0.16s ease, border-color 0.16s ease, transform 0.16s ease;
+}
+
+.btn:active {
+  transform: scale(0.97);
 }
 
 .btn-primary {
   background: var(--accent);
   color: white;
 }
+
 .btn-primary:hover {
   background: var(--accent-hover);
 }
+
 .btn-primary:disabled {
   opacity: 0.5;
   cursor: not-allowed;
 }
 
 .btn-ghost {
-  background: transparent;
+  background: #fff;
   color: var(--text-secondary);
+  border: 1px solid var(--border);
 }
+
 .btn-ghost:hover {
   background: var(--bg-hover);
   color: var(--text-primary);
@@ -103,11 +133,11 @@ input, textarea {
 .btn-danger {
   color: var(--danger);
 }
+
 .btn-danger:hover {
   background: rgba(239, 68, 68, 0.1);
 }
 
-/* Form */
 .form-group {
   margin-bottom: 16px;
 }
@@ -122,15 +152,16 @@ input, textarea {
 .form-input {
   width: 100%;
   padding: 12px 16px;
-  background: var(--bg-tertiary);
+  background: #fff;
   border: 1px solid var(--border);
-  border-radius: 8px;
+  border-radius: 14px;
   font-size: 15px;
-  transition: border-color 0.2s;
+  transition: border-color 0.2s, box-shadow 0.2s;
 }
 
 .form-input:focus {
   border-color: var(--accent);
+  box-shadow: 0 0 0 3px rgba(45, 102, 218, 0.11);
 }
 
 .form-error {
@@ -139,7 +170,6 @@ input, textarea {
   margin-top: 12px;
 }
 
-/* Markdown content */
 .markdown-body {
   line-height: 1.7;
   font-size: 15px;
@@ -149,11 +179,11 @@ input, textarea {
 .markdown-body p {
   margin-bottom: 12px;
 }
+
 .markdown-body p:last-child {
   margin-bottom: 0;
 }
 
-/* 单个换行（非空行分段）时也留出呼吸空间，避免像 OCR 结果那样一行行挤在一起 */
 .markdown-body br {
   content: '';
   display: block;
@@ -161,8 +191,9 @@ input, textarea {
 }
 
 .markdown-body pre {
-  background: var(--bg-secondary);
-  border-radius: 8px;
+  background: #f8fafc;
+  border: 1px solid var(--border);
+  border-radius: 14px;
   padding: 16px;
   overflow-x: auto;
   margin: 12px 0;
@@ -174,9 +205,9 @@ input, textarea {
 }
 
 .markdown-body :not(pre) > code {
-  background: var(--bg-tertiary);
+  background: #eef2ff;
   padding: 2px 6px;
-  border-radius: 4px;
+  border-radius: 6px;
 }
 
 .markdown-body ul, .markdown-body ol {
@@ -204,7 +235,7 @@ input, textarea {
 }
 
 .markdown-body th {
-  background: var(--bg-tertiary);
+  background: var(--bg-soft);
 }
 
 .markdown-body a {
@@ -216,12 +247,12 @@ input, textarea {
   border-radius: 8px;
 }
 
-/* Overlay for mobile sidebar */
 .sidebar-overlay {
   display: none;
   position: fixed;
   inset: 0;
-  background: rgba(0, 0, 0, 0.5);
+  background: rgba(21, 32, 51, 0.34);
+  backdrop-filter: blur(2px);
   z-index: 90;
 }
 
@@ -230,3 +261,13 @@ input, textarea {
     display: block;
   }
 }
+
+@media (prefers-reduced-motion: reduce) {
+  *,
+  *::before,
+  *::after {
+    scroll-behavior: auto !important;
+    animation-duration: 0.01ms !important;
+    animation-iteration-count: 1 !important;
+  }
+}
diff --git a/frontend/src/components/ChatInput.vue b/frontend/src/components/ChatInput.vue
index 722f287..91ff904 100644
--- a/frontend/src/components/ChatInput.vue
+++ b/frontend/src/components/ChatInput.vue
@@ -1,6 +1,27 @@
 <template>
   <div class="chat-input-area">
-    <!-- 附件预览 -->
+    <Teleport to="body">
+      <Transition name="drop-overlay">
+        <div
+          v-if="isDragging"
+          class="drop-overlay"
+          :class="{ blocked: !canUploadImage }"
+          role="status"
+          aria-live="polite"
+        >
+          <div class="drop-card">
+            <span class="drop-icon" aria-hidden="true">
+              <IconPhotoUp :size="34" :stroke-width="1.65" />
+            </span>
+            <strong>{{ dropOverlayTitle }}</strong>
+            <span>
+              {{ dropOverlayDescription }}
+            </span>
+          </div>
+        </div>
+      </Transition>
+    </Teleport>
+
     <div v-if="pendingAttachments.length || uploadingFiles.length" class="attachment-preview">
       <div v-for="(att, i) in pendingAttachments" :key="'done-' + i" class="preview-item">
         <img v-if="att?.type === 'image'" :src="att.preview" class="preview-thumb" />
@@ -18,45 +39,85 @@
       </div>
     </div>
 
-    <div class="input-wrapper">
-      <div class="input-actions">
-        <button
-          v-if="canUploadImage || canUploadVideo || canUploadFile"
-          class="action-btn"
-          title="上传文件"
-          @click="triggerUpload"
+    <div class="input-wrapper" :class="{ 'image-mode': isComfyModel, 'agent-enabled': activeAgent && !isComfyModel }">
+      <Transition name="agent-panel">
+        <section
+          v-if="showAgentPanel && !isComfyModel"
+          class="agent-panel"
+          aria-label="选择 Agent"
         >
-          <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-            <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>
+          <header class="agent-panel-header">
+            <div>
+              <span class="agent-eyebrow">Agent 工作台</span>
+              <h3>选择处理这项任务的方式</h3>
+              <p>Agent 会为当前请求加入稳定的分析步骤和输出规范。</p>
+            </div>
+            <button
+              class="agent-panel-close"
+              type="button"
+              aria-label="关闭 Agent 面板"
+              @click="showAgentPanel = false"
+            >
+              <IconX :size="18" :stroke-width="1.8" />
+            </button>
+          </header>
+
+          <div class="agent-options">
+            <button
+              v-for="agent in settings.agents"
+              :key="agent.id"
+              class="agent-option"
+              :class="{ selected: activeAgent?.id === agent.id }"
+              type="button"
+              @click="selectAgent(agent)"
+            >
+              <span class="agent-option-icon" :data-accent="agent.accent">
+                <component :is="agentIcon(agent.icon)" :size="20" :stroke-width="1.75" />
+              </span>
+              <span class="agent-option-copy">
+                <span class="agent-option-heading">
+                  <strong>{{ agent.name }}</strong>
+                  <span v-for="tag in agent.tags" :key="tag" class="agent-tag">{{ tag }}</span>
+                </span>
+                <small>{{ agent.description }}</small>
+              </span>
+              <IconCircleCheckFilled
+                v-if="activeAgent?.id === agent.id"
+                class="agent-option-check"
+                :size="18"
+              />
+            </button>
+          </div>
+
+          <footer v-if="activeAgent" class="agent-panel-footer">
+            <div class="agent-starters">
+              <span>快速开始</span>
+              <button
+                v-for="starter in activeAgent.starters"
+                :key="starter"
+                type="button"
+                @click="applyAgentStarter(starter)"
+              >{{ starter }}</button>
+            </div>
+            <button class="agent-disable" type="button" @click="clearAgent">
+              不使用 Agent
+            </button>
+          </footer>
+        </section>
+      </Transition>
+
+      <div v-if="activeAgent && !isComfyModel" class="active-agent-strip">
+        <span class="active-agent-icon" :data-accent="activeAgent.accent">
+          <component :is="agentIcon(activeAgent.icon)" :size="18" :stroke-width="1.8" />
+        </span>
+        <span class="active-agent-copy">
+          <strong>{{ activeAgent.name }}</strong>
+          <small>{{ activeAgent.description }}</small>
+        </span>
+        <button type="button" class="active-agent-adjust" @click="showAgentPanel = true">调整</button>
+        <button type="button" class="active-agent-remove" aria-label="关闭当前 Agent" @click="clearAgent">
+          <IconX :size="16" :stroke-width="1.9" />
         </button>
-
-        <button
-          v-if="features.emoji"
-          class="action-btn"
-          title="表情"
-          @click="showEmoji = !showEmoji"
-        >
-          😊
-        </button>
-
-        <input
-          ref="fileInput"
-          type="file"
-          hidden
-          :accept="acceptTypes"
-          @change="handleFileSelect"
-        />
-      </div>
-
-      <!-- 表情面板 -->
-      <div v-if="showEmoji" class="emoji-panel">
-        <button
-          v-for="emoji in EMOJIS"
-          :key="emoji"
-          class="emoji-btn"
-          @click="insertEmoji(emoji)"
-        >{{ emoji }}</button>
       </div>
 
       <textarea
@@ -64,36 +125,167 @@
         v-model="content"
         class="input-textarea"
         :placeholder="inputPlaceholder"
-        rows="1"
+        rows="3"
         @keydown="handleKeydown"
         @input="autoResize"
         @paste="handlePaste"
       />
 
-      <button
-        class="send-btn"
-        :disabled="!canSend || sending"
-        @click="handleSend"
-      >
-        <svg width="20" height="20" viewBox="0 0 24 24" fill="currentColor">
-          <path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z"/>
-        </svg>
-      </button>
+      <div v-if="showEmoji" class="emoji-panel">
+        <button
+          v-for="emoji in EMOJIS"
+          :key="emoji"
+          class="emoji-btn"
+          type="button"
+          @click="insertEmoji(emoji)"
+        >{{ emoji }}</button>
+      </div>
+
+      <div class="toolbar-row">
+        <div class="toolbar-primary">
+          <button
+            v-if="canUploadImage || canUploadVideo || canUploadFile"
+            class="icon-btn"
+            type="button"
+            title="上传文件"
+            aria-label="上传文件"
+            @click="triggerUpload"
+          >
+            <IconPaperclip :size="18" :stroke-width="1.8" />
+          </button>
+
+          <input
+            ref="fileInput"
+            type="file"
+            hidden
+            multiple
+            :accept="acceptTypes"
+            @change="handleFileSelect"
+          />
+
+          <button
+            v-if="!isComfyModel && settings.agents.length"
+            class="agent-trigger"
+            :class="{ active: activeAgent }"
+            type="button"
+            :title="activeAgent ? `当前 Agent：${activeAgent.name}` : '选择 Agent'"
+            :aria-label="activeAgent ? `当前 Agent：${activeAgent.name}` : '选择 Agent'"
+            :aria-expanded="showAgentPanel"
+            @click="showAgentPanel = !showAgentPanel"
+          >
+            <IconRobot :size="17" :stroke-width="1.8" />
+            <span class="agent-trigger-label">{{ activeAgent?.short_name || 'Agent' }}</span>
+            <span v-if="activeAgent" class="agent-live-dot" aria-hidden="true" />
+          </button>
+
+          <div class="mode-switch" role="tablist" aria-label="创作模式">
+            <button
+              class="mode-tab"
+              :class="{ active: !isComfyModel }"
+              type="button"
+              role="tab"
+              :aria-selected="!isComfyModel"
+              @click="switchToTextMode"
+            >
+              <IconMessageCircle :size="17" :stroke-width="1.8" />
+              <span class="mode-label-full">语言模型</span>
+              <span class="mode-label-short">对话</span>
+            </button>
+
+            <button
+              v-if="imageModelOptions.length"
+              class="mode-tab"
+              :class="{ active: isComfyModel }"
+              type="button"
+              role="tab"
+              :aria-selected="isComfyModel"
+              @click="switchToImageMode"
+            >
+              <IconPhoto :size="17" :stroke-width="1.8" />
+              <span class="mode-label-full">图片生成</span>
+              <span class="mode-label-short">生图</span>
+            </button>
+          </div>
+
+          <label v-if="settings.models.length" class="model-picker" title="选择模型">
+            <IconSparkles :size="16" :stroke-width="1.8" />
+            <select
+              :value="selectedModelValue"
+              aria-label="选择模型"
+              @change="handleModelChange"
+            >
+              <option v-for="m in settings.models" :key="m.id" :value="String(m.id)">
+                {{ m.name }}{{ m.provider === 'comfy' ? ' / 生图' : '' }}
+              </option>
+            </select>
+          </label>
+        </div>
+
+        <div class="toolbar-secondary">
+          <span class="model-status">
+            <IconCircleCheckFilled :size="15" />
+            {{ capabilityText }}
+          </span>
+
+          <button
+            v-if="features.emoji"
+            class="icon-btn emoji-toggle"
+            type="button"
+            title="插入表情"
+            aria-label="插入表情"
+            :aria-expanded="showEmoji"
+            @click="showEmoji = !showEmoji"
+          >
+            <IconMoodSmile :size="18" :stroke-width="1.8" />
+          </button>
+
+          <button
+            class="send-btn"
+            type="button"
+            aria-label="发送消息"
+            :disabled="!canSend || sending"
+            @click="handleSend"
+          >
+            <IconArrowUp :size="19" :stroke-width="2" />
+          </button>
+        </div>
+      </div>
     </div>
 
-    <p v-if="uploadingFiles.length" class="input-hint">正在上传 {{ uploadingFiles.length }} 个文件…</p>
-    <p v-else-if="isComfyModel" class="input-hint">当前为 ComfyUI 生图模式，发送描述后将在对话中生成图片</p>
-    <p v-else-if="imageBlockedByModel" class="input-hint input-hint-warn">当前模型不支持图片识别，已隐藏图片上传</p>
-    <p v-else class="input-hint">AI 可能会犯错，请核实重要信息</p>
+    <p v-if="uploadingFiles.length" class="input-hint">正在上传 {{ uploadingFiles.length }} 个文件</p>
+    <p v-else-if="isComfyModel && pendingAttachments.length" class="input-hint input-hint-warn">
+      当前工作流仅支持文生图，请移除附件后输入图片描述
+    </p>
+    <p v-else-if="isComfyModel" class="input-hint">当前是图片生成模式，发送提示词后会在对话中返回图片</p>
+    <p v-else-if="auth.isGuest && features.upload_image" class="input-hint input-hint-warn">
+      游客模式不支持发送图片，登录后即可上传
+    </p>
+    <p v-else-if="imageBlockedByModel" class="input-hint input-hint-warn">当前模型不支持图片识别，已自动隐藏图片上传</p>
+    <p v-else class="input-hint">{{ defaultInputHint }}</p>
   </div>
 </template>
 
 <script setup>
-import { ref, computed } from 'vue'
+import { ref, computed, nextTick, onMounted, onBeforeUnmount } from 'vue'
 import { useSettingsStore } from '@/stores/settings'
 import { useAuthStore } from '@/stores/auth'
 import { useChatStore } from '@/stores/chat'
+import { useNotificationStore } from '@/stores/notification'
 import { EMOJIS } from '@/utils/markdown'
+import IconArrowUp from '@tabler/icons-vue/dist/esm/icons/IconArrowUp.mjs'
+import IconCircleCheckFilled from '@tabler/icons-vue/dist/esm/icons/IconCircleCheckFilled.mjs'
+import IconMessageCircle from '@tabler/icons-vue/dist/esm/icons/IconMessageCircle.mjs'
+import IconMoodSmile from '@tabler/icons-vue/dist/esm/icons/IconMoodSmile.mjs'
+import IconPaperclip from '@tabler/icons-vue/dist/esm/icons/IconPaperclip.mjs'
+import IconPhoto from '@tabler/icons-vue/dist/esm/icons/IconPhoto.mjs'
+import IconPhotoUp from '@tabler/icons-vue/dist/esm/icons/IconPhotoUp.mjs'
+import IconRobot from '@tabler/icons-vue/dist/esm/icons/IconRobot.mjs'
+import IconRoute from '@tabler/icons-vue/dist/esm/icons/IconRoute.mjs'
+import IconCodeDots from '@tabler/icons-vue/dist/esm/icons/IconCodeDots.mjs'
+import IconPencilBolt from '@tabler/icons-vue/dist/esm/icons/IconPencilBolt.mjs'
+import IconChartDots3 from '@tabler/icons-vue/dist/esm/icons/IconChartDots3.mjs'
+import IconSparkles from '@tabler/icons-vue/dist/esm/icons/IconSparkles.mjs'
+import IconX from '@tabler/icons-vue/dist/esm/icons/IconX.mjs'
 import api from '@/api'
 
 const emit = defineEmits(['send'])
@@ -101,14 +293,18 @@ const emit = defineEmits(['send'])
 const settings = useSettingsStore()
 const auth = useAuthStore()
 const chat = useChatStore()
+const notification = useNotificationStore()
 
 const content = ref('')
 const pendingAttachments = ref([])
 const uploadingFiles = ref([])
 const showEmoji = ref(false)
+const showAgentPanel = ref(false)
 const sending = ref(false)
 const fileInput = ref(null)
 const textareaRef = ref(null)
+const isDragging = ref(false)
+let dragDepth = 0
 
 const features = computed(() => settings.features)
 const perms = computed(() => auth.user?.membership_permissions || {})
@@ -123,10 +319,24 @@ const activeModel = computed(() => {
 })
 
 const isComfyModel = computed(() => activeModel.value?.provider === 'comfy')
+const imageModelOptions = computed(() => settings.models.filter(m => m.provider === 'comfy'))
+const textModelOptions = computed(() => settings.models.filter(m => m.provider !== 'comfy'))
+const selectedModelValue = computed(() => chat.selectedModelId == null ? '' : String(chat.selectedModelId))
+const activeAgent = computed(() => {
+  return settings.agents.find(agent => agent.id === chat.selectedAgentId) || null
+})
+
+const agentIcons = {
+  route: IconRoute,
+  code: IconCodeDots,
+  pencil: IconPencilBolt,
+  chart: IconChartDots3
+}
 
 const inputPlaceholder = computed(() => {
-  if (isComfyModel.value) return '描述你想生成的图片… (Shift+Enter 换行)'
-  return '输入消息... (Shift+Enter 换行)'
+  if (isComfyModel.value) return '描述你想要的图片，比如场景、主体、风格、镜头和光线'
+  if (activeAgent.value?.placeholder) return activeAgent.value.placeholder
+  return '给我一段需求，我可以继续对话，也可以帮你联动图片生成'
 })
 
 const modelSupportsImage = computed(() => {
@@ -135,9 +345,19 @@ const modelSupportsImage = computed(() => {
   return activeModel.value.support_image !== 0 && activeModel.value.support_image !== false
 })
 
-const canUploadImage = computed(() => features.value.upload_image && perms.value.can_upload_image && modelSupportsImage.value)
-const canUploadVideo = computed(() => features.value.upload_video && perms.value.can_upload_video)
-const canUploadFile = computed(() => features.value.upload_file && perms.value.can_upload_file)
+const canUploadImage = computed(() => !auth.isGuest && features.value.upload_image && perms.value.can_upload_image && modelSupportsImage.value)
+const canUploadVideo = computed(() => !isComfyModel.value && features.value.upload_video && perms.value.can_upload_video)
+const canUploadFile = computed(() => !isComfyModel.value && features.value.upload_file && perms.value.can_upload_file)
+
+const dropOverlayTitle = computed(() => {
+  if (canUploadImage.value) return '松开即可添加图片'
+  return auth.isGuest ? '游客模式不能发送图片' : '当前模型无法接收图片'
+})
+
+const dropOverlayDescription = computed(() => {
+  if (canUploadImage.value) return '支持一次拖入多张图片，上传后可直接让模型查看'
+  return auth.isGuest ? '登录账户后即可拖入、粘贴或上传图片' : '请切换到支持视觉识别的语言模型'
+})
 
 const imageBlockedByModel = computed(() => {
   return features.value.upload_image && perms.value.can_upload_image && !modelSupportsImage.value
@@ -157,33 +377,319 @@ const canSend = computed(() => {
     !uploadingFiles.value.length
 })
 
+const capabilityText = computed(() => {
+  if (isComfyModel.value) return '已连接图片生成模型'
+  if (activeAgent.value) return `${activeAgent.value.name}已就绪`
+  return '已连接语言模型'
+})
+
+const defaultInputHint = computed(() => {
+  if (canUploadImage.value) {
+    return features.value.paste_image
+      ? '可拖入或粘贴图片，Shift + Enter 可换行'
+      : '可拖入图片，Shift + Enter 可换行'
+  }
+  return '重要信息请自行核对，Shift + Enter 可换行'
+})
+
+onMounted(() => {
+  window.addEventListener('dragenter', handleWindowDragEnter)
+  window.addEventListener('dragover', handleWindowDragOver)
+  window.addEventListener('dragleave', handleWindowDragLeave)
+  window.addEventListener('drop', handleWindowDrop)
+})
+
+onBeforeUnmount(() => {
+  window.removeEventListener('dragenter', handleWindowDragEnter)
+  window.removeEventListener('dragover', handleWindowDragOver)
+  window.removeEventListener('dragleave', handleWindowDragLeave)
+  window.removeEventListener('drop', handleWindowDrop)
+  uploadingFiles.value.forEach(item => item.controller.abort())
+  pendingAttachments.value.forEach(item => {
+    if (item?._localPreview) URL.revokeObjectURL(item._localPreview)
+  })
+})
+
 function autoResize() {
   const el = textareaRef.value
   if (!el) return
   el.style.height = 'auto'
-  el.style.height = Math.min(el.scrollHeight, 200) + 'px'
+  el.style.height = Math.min(el.scrollHeight, 220) + 'px'
 }
 
 function handleKeydown(e) {
+  if (e.key === 'Escape' && showAgentPanel.value) {
+    e.preventDefault()
+    showAgentPanel.value = false
+    return
+  }
+
   if (e.key === 'Enter' && !e.shiftKey) {
     e.preventDefault()
     handleSend()
   }
 }
 
+function agentIcon(icon) {
+  return agentIcons[icon] || IconRobot
+}
+
+function selectAgent(agent) {
+  chat.setSelectedAgent(agent.id)
+}
+
+function clearAgent() {
+  chat.setSelectedAgent(null)
+  showAgentPanel.value = false
+  textareaRef.value?.focus()
+}
+
+async function applyAgentStarter(starter) {
+  content.value = content.value.trim()
+    ? `${content.value.trim()}\n${starter}`
+    : starter
+  showAgentPanel.value = false
+  await nextTick()
+  autoResize()
+  textareaRef.value?.focus()
+}
+
 function triggerUpload() {
   fileInput.value?.click()
 }
 
+function hasPotentialImage(dataTransfer) {
+  if (!dataTransfer) return false
+
+  const items = Array.from(dataTransfer.items || [])
+  if (items.some(item => item.kind === 'file' && (!item.type || item.type.startsWith('image/')))) {
+    return true
+  }
+
+  const types = Array.from(dataTransfer.types || [])
+  return types.includes('Files') || types.includes('text/uri-list') || types.includes('text/html')
+}
+
+function resetDragState() {
+  dragDepth = 0
+  isDragging.value = false
+}
+
+function handleWindowDragEnter(event) {
+  if (!hasPotentialImage(event.dataTransfer)) return
+  event.preventDefault()
+  dragDepth += 1
+  isDragging.value = true
+}
+
+function handleWindowDragOver(event) {
+  if (!isDragging.value && !hasPotentialImage(event.dataTransfer)) return
+  event.preventDefault()
+  if (event.dataTransfer) {
+    event.dataTransfer.dropEffect = canUploadImage.value ? 'copy' : 'none'
+  }
+}
+
+function handleWindowDragLeave(event) {
+  if (!isDragging.value) return
+  event.preventDefault()
+  if (!event.relatedTarget) {
+    resetDragState()
+    return
+  }
+  dragDepth = Math.max(0, dragDepth - 1)
+  if (dragDepth === 0) resetDragState()
+}
+
+function handleWindowDrop(event) {
+  if (!isDragging.value && !hasPotentialImage(event.dataTransfer)) return
+  event.preventDefault()
+  const dataTransfer = event.dataTransfer
+  resetDragState()
+  void handleDroppedImages(dataTransfer)
+}
+
+function isImageFile(file) {
+  if (!file) return false
+  if (file.type?.startsWith('image/')) return true
+  return /\.(?:jpe?g|png|gif|webp|bmp)$/i.test(file.name || '')
+}
+
+function uniqueFiles(files) {
+  const seen = new Set()
+  return files.filter(file => {
+    const key = `${file.name}:${file.size}:${file.lastModified}`
+    if (seen.has(key)) return false
+    seen.add(key)
+    return true
+  })
+}
+
+function droppedImageUrl(dataTransfer) {
+  const uriList = dataTransfer?.getData('text/uri-list') || ''
+  const uri = uriList
+    .split(/\r?\n/)
+    .map(item => item.trim())
+    .find(item => item && !item.startsWith('#'))
+  if (uri) return uri
+
+  const html = dataTransfer?.getData('text/html') || ''
+  if (!html) return ''
+  return new DOMParser().parseFromString(html, 'text/html').querySelector('img')?.src || ''
+}
+
+function imageExtension(mime) {
+  return {
+    'image/jpeg': 'jpg',
+    'image/png': 'png',
+    'image/gif': 'gif',
+    'image/webp': 'webp',
+    'image/bmp': 'bmp'
+  }[mime] || 'png'
+}
+
+async function fileFromImageUrl(url) {
+  if (!/^(?:https?:|data:image\/)/i.test(url)) return null
+
+  const response = await fetch(url, { credentials: 'omit' })
+  if (!response.ok) throw new Error(`图片读取失败（HTTP ${response.status}）`)
+
+  const blob = await response.blob()
+  if (!blob.type.startsWith('image/')) throw new Error('拖入的链接不是有效图片')
+
+  let filename = '拖入的图片'
+  if (!url.startsWith('data:')) {
+    try {
+      filename = decodeURIComponent(new URL(url).pathname.split('/').pop() || filename)
+    } catch {
+      // Keep the fallback name for malformed source URLs.
+    }
+  }
+  const expectedExtension = imageExtension(blob.type)
+  if (!/\.(?:jpe?g|png|gif|webp|bmp)$/i.test(filename)) {
+    filename = filename.replace(/\.[^.]+$/, '') + `.${expectedExtension}`
+  }
+
+  return new File([blob], filename, { type: blob.type, lastModified: Date.now() })
+}
+
+async function collectDroppedImages(dataTransfer) {
+  const files = Array.from(dataTransfer?.files || []).filter(isImageFile)
+  if (files.length) return uniqueFiles(files)
+
+  const itemFiles = Array.from(dataTransfer?.items || [])
+    .filter(item => item.kind === 'file')
+    .map(item => item.getAsFile())
+    .filter(isImageFile)
+  if (itemFiles.length) return uniqueFiles(itemFiles)
+
+  const url = droppedImageUrl(dataTransfer)
+  if (!url) return []
+  const remoteFile = await fileFromImageUrl(url)
+  return remoteFile ? [remoteFile] : []
+}
+
+async function handleDroppedImages(dataTransfer) {
+  if (!canUploadImage.value) {
+    notification.show({
+      type: 'error',
+      title: auth.isGuest ? '游客模式不能发送图片' : '当前无法添加图片',
+      message: auth.isGuest ? '请先登录账户，再拖入或上传图片。' : '请切换到支持视觉识别的语言模型后再拖入图片。',
+      duration: 4500
+    })
+    return
+  }
+
+  try {
+    const files = await collectDroppedImages(dataTransfer)
+    if (!files.length) {
+      notification.show({
+        type: 'error',
+        title: '没有找到可上传的图片',
+        message: '请拖入 JPG、PNG、GIF、WebP 或 BMP 图片文件。',
+        duration: 4500
+      })
+      return
+    }
+
+    await Promise.all(files.map(uploadFile))
+    textareaRef.value?.focus()
+  } catch (err) {
+    notification.show({
+      type: 'error',
+      title: '无法读取拖入的图片',
+      message: '图片来源禁止浏览器读取，请先保存到本地后再拖入。',
+      detail: err?.message || '',
+      duration: 6000
+    })
+  }
+}
+
+async function handleModelChange(e) {
+  const value = e.target.value
+  const targetModel = settings.models.find(model => Number(model.id) === Number(value))
+  if (targetModel?.provider === 'comfy' && preventImageModeSwitchForAttachments()) {
+    e.target.value = selectedModelValue.value
+    return
+  }
+
+  try {
+    await chat.setSelectedModel(value === '' ? null : Number(value))
+    if (targetModel?.provider === 'comfy') showAgentPanel.value = false
+  } catch (err) {
+    notification.error(err, { title: '模型切换失败' })
+  }
+}
+
+async function switchToImageMode() {
+  if (preventImageModeSwitchForAttachments()) return
+
+  const target = activeModel.value?.provider === 'comfy'
+    ? activeModel.value
+    : imageModelOptions.value[0]
+  if (!target) return
+  try {
+    await chat.setSelectedModel(Number(target.id))
+    showAgentPanel.value = false
+  } catch (err) {
+    notification.error(err, { title: '图片模式切换失败' })
+  }
+}
+
+function preventImageModeSwitchForAttachments() {
+  if (!pendingAttachments.value.length && !uploadingFiles.value.length) return false
+
+  notification.show({
+    type: 'error',
+    title: '请先处理已添加的附件',
+    message: '当前图片仍属于语言模型消息。请先发送给语言模型，或点击缩略图上的 × 移除附件后，再切换到图片生成模式。',
+    duration: 6000
+  })
+  textareaRef.value?.focus()
+  return true
+}
+
+async function switchToTextMode() {
+  const target = activeModel.value?.provider !== 'comfy'
+    ? activeModel.value
+    : textModelOptions.value[0] || settings.models.find(m => m.is_default) || settings.models[0]
+  if (!target) return
+  try {
+    await chat.setSelectedModel(Number(target.id))
+  } catch (err) {
+    notification.error(err, { title: '语言模式切换失败' })
+  }
+}
+
 async function handleFileSelect(e) {
-  const file = e.target.files?.[0]
-  if (!file) return
-  await uploadFile(file)
+  const files = Array.from(e.target.files || [])
+  if (!files.length) return
+  await Promise.all(files.map(uploadFile))
   e.target.value = ''
 }
 
 async function handlePaste(e) {
-  if (!features.value.paste_image || !canUploadImage.value) return
+  if (!features.value.paste_image) return
 
   const items = e.clipboardData?.items
   if (!items) return
@@ -191,6 +697,15 @@ async function handlePaste(e) {
   for (const item of items) {
     if (item?.type?.startsWith('image/')) {
       e.preventDefault()
+      if (!canUploadImage.value) {
+        notification.show({
+          type: 'error',
+          title: auth.isGuest ? '游客模式不能发送图片' : '当前无法添加图片',
+          message: auth.isGuest ? '请先登录账户，再粘贴或上传图片。' : '当前模型不支持图片识别，请切换语言模型后重试。',
+          duration: 4500
+        })
+        return
+      }
       const file = item.getAsFile()
       if (file) await uploadFile(file)
       break
@@ -199,6 +714,16 @@ async function handlePaste(e) {
 }
 
 async function uploadFile(file) {
+  if (auth.isGuest && isImageFile(file)) {
+    notification.show({
+      type: 'error',
+      title: '游客模式不能发送图片',
+      message: '请先登录账户，再上传图片。',
+      duration: 4500
+    })
+    return
+  }
+
   const id = `up-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`
   const controller = new AbortController()
   const entry = { id, name: file.name, progress: 0, controller }
@@ -231,7 +756,7 @@ async function uploadFile(file) {
   } catch (err) {
     if (localPreview) URL.revokeObjectURL(localPreview)
     if (err.code !== 'ERR_CANCELED' && err.name !== 'CanceledError') {
-      alert(err.message || '上传失败')
+      notification.error(err, { title: '文件上传失败' })
     }
   } finally {
     uploadingFiles.value = uploadingFiles.value.filter(u => u.id !== id)
@@ -258,6 +783,38 @@ function insertEmoji(emoji) {
 async function handleSend() {
   if (!canSend.value) return
 
+  if (auth.isGuest && pendingAttachments.value.some(att => att?.type === 'image')) {
+    notification.show({
+      type: 'error',
+      title: '游客模式不能发送图片',
+      message: '请移除图片后继续发送文字，或登录账户后再发送图片。',
+      duration: 5000
+    })
+    return
+  }
+
+  if (isComfyModel.value && pendingAttachments.value.length) {
+    notification.show({
+      type: 'error',
+      title: '当前不支持图生图',
+      message: '当前 ComfyUI 工作流仅支持文字生成图片。请移除附件并输入图片描述；如需识别图片，请切换到语言模型。',
+      duration: 6000
+    })
+    textareaRef.value?.focus()
+    return
+  }
+
+  if (isComfyModel.value && !content.value.trim()) {
+    notification.show({
+      type: 'error',
+      title: '请输入图片描述',
+      message: '请描述主体、场景、风格、构图或光线后再生成图片。',
+      duration: 4500
+    })
+    textareaRef.value?.focus()
+    return
+  }
+
   sending.value = true
   const text = content.value.trim()
   const attachments = pendingAttachments.value.map(a => ({
@@ -280,16 +837,103 @@ async function handleSend() {
     textareaRef.value.style.height = 'auto'
   }
 
-  emit('send', { content: text, attachments })
+  emit('send', {
+    content: text,
+    attachments,
+    agentId: isComfyModel.value ? null : activeAgent.value?.id || null
+  })
   sending.value = false
 }
 </script>
 
 <style scoped>
+.drop-overlay {
+  position: fixed;
+  inset: 0;
+  z-index: 95;
+  display: grid;
+  place-items: center;
+  padding: 24px;
+  background: rgba(245, 248, 252, 0.76);
+  backdrop-filter: blur(7px);
+  pointer-events: none;
+}
+
+.drop-card {
+  width: min(460px, calc(100vw - 40px));
+  min-height: 238px;
+  padding: 34px;
+  border: 2px dashed #a9c3ee;
+  border-radius: 26px;
+  background: rgba(255, 255, 255, 0.96);
+  box-shadow: 0 24px 70px rgba(38, 59, 92, 0.17);
+  color: var(--text-primary);
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  text-align: center;
+}
+
+.drop-icon {
+  width: 66px;
+  height: 66px;
+  margin-bottom: 18px;
+  border-radius: 20px;
+  display: grid;
+  place-items: center;
+  background: #edf4ff;
+  color: var(--accent);
+  box-shadow: inset 0 0 0 1px rgba(45, 102, 218, 0.09);
+}
+
+.drop-card strong {
+  font-size: 21px;
+  font-weight: 680;
+  letter-spacing: -0.01em;
+}
+
+.drop-card > span:last-child {
+  max-width: 32em;
+  margin-top: 9px;
+  color: var(--text-secondary);
+  font-size: 13px;
+  line-height: 1.65;
+}
+
+.drop-overlay.blocked .drop-card {
+  border-color: #e7b4b4;
+}
+
+.drop-overlay.blocked .drop-icon {
+  background: #fff1f1;
+  color: var(--danger);
+}
+
+.drop-overlay-enter-active,
+.drop-overlay-leave-active {
+  transition: opacity 0.18s ease;
+}
+
+.drop-overlay-enter-active .drop-card,
+.drop-overlay-leave-active .drop-card {
+  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.18s ease;
+}
+
+.drop-overlay-enter-from,
+.drop-overlay-leave-to {
+  opacity: 0;
+}
+
+.drop-overlay-enter-from .drop-card,
+.drop-overlay-leave-to .drop-card {
+  opacity: 0;
+  transform: translateY(10px) scale(0.97);
+}
+
 .chat-input-area {
-  padding: 12px 16px 16px;
-  border-top: 1px solid var(--border);
-  background: var(--bg-primary);
+  padding: 10px 24px 20px;
+  background: transparent;
 }
 
 .attachment-preview {
@@ -297,7 +941,7 @@ async function handleSend() {
   flex-wrap: wrap;
   gap: 8px;
   max-width: var(--input-max-width);
-  margin: 0 auto 8px;
+  margin: 0 auto 10px;
 }
 
 .preview-item {
@@ -306,17 +950,19 @@ async function handleSend() {
 }
 
 .preview-thumb {
-  width: 64px;
-  height: 64px;
+  width: 68px;
+  height: 68px;
   object-fit: cover;
-  border-radius: 8px;
+  border-radius: 14px;
   border: 1px solid var(--border);
+  box-shadow: 0 6px 20px rgba(38, 59, 92, 0.08);
 }
 
 .preview-file {
-  padding: 8px 12px;
-  background: var(--bg-tertiary);
-  border-radius: 8px;
+  padding: 10px 14px;
+  background: #fff;
+  border: 1px solid var(--border);
+  border-radius: 12px;
   font-size: 13px;
 }
 
@@ -326,9 +972,9 @@ async function handleSend() {
   gap: 4px;
   width: 140px;
   padding: 8px 10px;
-  background: var(--bg-tertiary);
+  background: #fff;
   border: 1px solid var(--border);
-  border-radius: 8px;
+  border-radius: 12px;
   font-size: 12px;
 }
 
@@ -348,7 +994,7 @@ async function handleSend() {
 .upload-progress-track {
   width: 100%;
   height: 4px;
-  background: var(--bg-hover);
+  background: var(--bg-soft);
   border-radius: 2px;
   overflow: hidden;
 }
@@ -364,8 +1010,8 @@ async function handleSend() {
   position: absolute;
   top: -6px;
   right: -6px;
-  width: 20px;
-  height: 20px;
+  width: 22px;
+  height: 22px;
   border-radius: 50%;
   background: var(--danger);
   color: white;
@@ -377,94 +1023,829 @@ async function handleSend() {
 }
 
 .input-wrapper {
-  display: flex;
-  align-items: flex-end;
-  gap: 8px;
   max-width: var(--input-max-width);
   margin: 0 auto;
-  padding: 8px 12px;
-  background: var(--bg-tertiary);
-  border: 1px solid var(--border);
-  border-radius: var(--radius);
+  background: #fff;
+  border: 1px solid var(--border-strong);
+  border-radius: 20px;
   position: relative;
+  box-shadow: var(--shadow-composer);
+  transition: border-color 0.18s ease, box-shadow 0.18s ease;
 }
 
-.input-actions {
+.agent-panel {
+  position: absolute;
+  right: 0;
+  bottom: calc(100% + 10px);
+  left: 0;
+  z-index: 40;
+  max-height: min(58dvh, 430px);
+  padding: 18px;
+  overflow-y: auto;
+  overscroll-behavior: contain;
+  border: 1px solid #dce3ec;
+  border-radius: 22px;
+  background: rgba(255, 255, 255, 0.98);
+  box-shadow: 0 24px 64px rgba(31, 49, 78, 0.17), 0 2px 8px rgba(31, 49, 78, 0.06);
+  backdrop-filter: blur(16px);
+}
+
+.agent-panel-header {
   display: flex;
-  gap: 2px;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 20px;
+  padding: 2px 2px 14px;
+}
+
+.agent-eyebrow {
+  display: block;
+  margin-bottom: 5px;
+  color: var(--accent);
+  font-size: 10px;
+  font-weight: 700;
+  letter-spacing: 0.09em;
+  text-transform: uppercase;
+}
+
+.agent-panel-header h3 {
+  color: var(--text-primary);
+  font-size: 18px;
+  font-weight: 680;
+  letter-spacing: -0.025em;
+  line-height: 1.35;
+}
+
+.agent-panel-header p {
+  margin-top: 4px;
+  color: var(--text-muted);
+  font-size: 12px;
+  line-height: 1.55;
+}
+
+.agent-panel-close,
+.active-agent-remove {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  color: var(--text-muted);
+  transition: color 0.16s ease, background 0.16s ease, transform 0.16s ease;
+}
+
+.agent-panel-close {
+  width: 34px;
+  height: 34px;
+  border-radius: 50%;
+}
+
+.agent-panel-close:hover,
+.active-agent-remove:hover {
+  background: #edf1f6;
+  color: var(--text-primary);
+}
+
+.agent-panel-close:active,
+.active-agent-remove:active {
+  transform: scale(0.94);
+}
+
+.agent-options {
+  overflow: hidden;
+  border-top: 1px solid #e8edf3;
+  border-bottom: 1px solid #e8edf3;
+}
+
+.agent-option {
+  position: relative;
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  width: 100%;
+  min-height: 72px;
+  padding: 10px 10px 10px 8px;
+  color: var(--text-primary);
+  text-align: left;
+  transition: background 0.16s ease, transform 0.16s ease;
+}
+
+.agent-option + .agent-option {
+  border-top: 1px solid #edf1f5;
+}
+
+.agent-option::before {
+  position: absolute;
+  top: 13px;
+  bottom: 13px;
+  left: 0;
+  width: 3px;
+  border-radius: 3px;
+  background: var(--accent);
+  content: '';
+  opacity: 0;
+  transform: scaleY(0.55);
+  transition: opacity 0.16s ease, transform 0.18s ease;
+}
+
+.agent-option:hover {
+  background: #f8fafc;
+}
+
+.agent-option:active {
+  transform: scale(0.995);
+}
+
+.agent-option.selected {
+  background: #f2f6fc;
+}
+
+.agent-option.selected::before {
+  opacity: 1;
+  transform: scaleY(1);
+}
+
+.agent-option-icon,
+.active-agent-icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  background: #eaf1ff;
+  color: #2d66da;
+}
+
+.agent-option-icon {
+  width: 42px;
+  height: 42px;
+  border-radius: 13px;
+}
+
+.agent-option-icon[data-accent='teal'],
+.active-agent-icon[data-accent='teal'] {
+  background: #e7f5f1;
+  color: #177565;
+}
+
+.agent-option-icon[data-accent='amber'],
+.active-agent-icon[data-accent='amber'] {
+  background: #fff3dd;
+  color: #94600b;
+}
+
+.agent-option-icon[data-accent='slate'],
+.active-agent-icon[data-accent='slate'] {
+  background: #edf0f4;
+  color: #4b5b70;
+}
+
+.agent-option-copy {
+  display: flex;
+  flex: 1;
+  flex-direction: column;
+  min-width: 0;
+}
+
+.agent-option-heading {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  min-width: 0;
+}
+
+.agent-option-heading strong {
+  margin-right: 3px;
+  font-size: 14px;
+  font-weight: 650;
+}
+
+.agent-option-copy small {
+  margin-top: 5px;
+  overflow: hidden;
+  color: var(--text-muted);
+  font-size: 12px;
+  line-height: 1.4;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.agent-tag {
+  padding: 2px 6px;
+  border: 1px solid #e0e6ee;
+  border-radius: 5px;
+  background: #fff;
+  color: #67758a;
+  font-size: 10px;
+  line-height: 1.4;
+}
+
+.agent-option-check {
+  flex-shrink: 0;
+  color: var(--accent);
+}
+
+.agent-panel-footer {
+  display: flex;
+  align-items: flex-end;
+  gap: 18px;
+  padding: 14px 2px 1px;
+}
+
+.agent-starters {
+  display: flex;
+  flex: 1;
+  flex-wrap: wrap;
+  gap: 7px;
+  min-width: 0;
+}
+
+.agent-starters > span {
+  width: 100%;
+  color: var(--text-muted);
+  font-size: 10px;
+  font-weight: 650;
+  letter-spacing: 0.05em;
+}
+
+.agent-starters button {
+  max-width: 100%;
+  padding: 6px 9px;
+  overflow: hidden;
+  border: 1px solid #dfe6ef;
+  border-radius: 8px;
+  background: #f8fafc;
+  color: var(--text-secondary);
+  font-size: 11px;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  transition: background 0.16s ease, border-color 0.16s ease, color 0.16s ease;
+}
+
+.agent-starters button:hover {
+  border-color: #c9d7ed;
+  background: #f1f6fd;
+  color: var(--accent);
+}
+
+.agent-disable {
+  flex-shrink: 0;
+  padding: 7px 4px;
+  color: var(--text-muted);
+  font-size: 11px;
+}
+
+.agent-disable:hover {
+  color: var(--danger);
+}
+
+.active-agent-strip {
+  display: flex;
+  align-items: center;
+  gap: 9px;
+  min-height: 48px;
+  margin: 9px 10px 0;
+  padding: 6px 7px;
+  border: 1px solid #e1e7ef;
+  border-radius: 12px;
+  background: #f7f9fc;
+}
+
+.active-agent-icon {
+  width: 34px;
+  height: 34px;
+  border-radius: 10px;
+}
+
+.active-agent-copy {
+  display: flex;
+  flex: 1;
+  flex-direction: column;
+  min-width: 0;
+}
+
+.active-agent-copy strong {
+  color: var(--text-primary);
+  font-size: 12px;
+  font-weight: 650;
+  line-height: 1.35;
+}
+
+.active-agent-copy small {
+  margin-top: 2px;
+  overflow: hidden;
+  color: var(--text-muted);
+  font-size: 10px;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.active-agent-adjust {
+  padding: 5px 7px;
+  color: var(--accent);
+  font-size: 11px;
+  font-weight: 600;
+}
+
+.active-agent-remove {
+  width: 28px;
+  height: 28px;
+  border-radius: 50%;
+}
+
+.agent-trigger {
+  position: relative;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 6px;
+  height: 36px;
+  padding: 0 10px;
+  flex-shrink: 0;
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  background: #fff;
+  color: var(--text-secondary);
+  font-size: 12px;
+  font-weight: 600;
+  transition: background 0.16s ease, border-color 0.16s ease, color 0.16s ease, transform 0.16s ease;
+}
+
+.agent-trigger:hover {
+  border-color: #cdd8e7;
+  background: #f8fafc;
+  color: var(--text-primary);
+}
+
+.agent-trigger.active {
+  border-color: #bfd1ef;
+  background: #eef4fd;
+  color: var(--accent);
+}
+
+.agent-trigger:active {
+  transform: scale(0.96);
+}
+
+.agent-live-dot {
+  width: 5px;
+  height: 5px;
+  border-radius: 50%;
+  background: #2f8d73;
+  box-shadow: 0 0 0 3px rgba(47, 141, 115, 0.1);
+}
+
+.agent-panel-enter-active,
+.agent-panel-leave-active {
+  transition: opacity 0.18s ease, transform 0.22s cubic-bezier(0.16, 1, 0.3, 1);
+  transform-origin: center bottom;
+}
+
+.agent-panel-enter-from,
+.agent-panel-leave-to {
+  opacity: 0;
+  transform: translateY(8px) scale(0.985);
+}
+
+.input-wrapper:focus-within {
+  border-color: rgba(45, 102, 218, 0.54);
+  box-shadow: 0 0 0 3px rgba(45, 102, 218, 0.09), var(--shadow-composer);
+}
+
+.input-wrapper.image-mode:focus-within {
+  border-color: rgba(45, 102, 218, 0.54);
+}
+
+.input-textarea {
+  width: 100%;
+  resize: none;
+  min-height: 76px;
+  max-height: 220px;
+  padding: 16px 18px 10px;
+  font-size: 16px;
+  line-height: 1.55;
+}
+
+.input-textarea::placeholder {
+  color: #8a97a9;
+}
+
+.input-textarea:focus-visible,
+.model-picker select:focus-visible {
+  outline: none;
+}
+
+.toolbar-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 8px 10px 10px;
+}
+
+.toolbar-primary,
+.toolbar-secondary {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+
+.toolbar-primary {
+  min-width: 0;
+}
+
+.toolbar-secondary {
+  margin-left: auto;
   flex-shrink: 0;
 }
 
-.action-btn {
-  padding: 6px;
-  border-radius: 6px;
-  color: var(--text-muted);
-  font-size: 18px;
-  line-height: 1;
+.icon-btn {
+  width: 34px;
+  height: 34px;
+  border-radius: 50%;
+  background: transparent;
+  border: 1px solid transparent;
+  color: var(--text-secondary);
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  transition: background 0.16s ease, border-color 0.16s ease, color 0.16s ease, transform 0.16s ease;
 }
-.action-btn:hover {
-  background: var(--bg-hover);
+
+.toolbar-primary > .icon-btn {
+  background: #fff;
+  border-color: var(--border);
+}
+
+.icon-btn:hover {
+  background: var(--bg-soft);
   color: var(--text-primary);
 }
 
+.icon-btn:active,
+.mode-tab:active,
+.send-btn:active:not(:disabled) {
+  transform: scale(0.96);
+}
+
+.mode-switch {
+  display: inline-flex;
+  align-items: center;
+  gap: 2px;
+  height: 36px;
+  padding: 2px;
+  border-radius: 12px;
+  background: #f3f6fa;
+  border: 1px solid var(--border);
+  flex-shrink: 0;
+}
+
+.mode-tab {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 6px;
+  height: 30px;
+  padding: 0 10px;
+  border-radius: 9px;
+  color: var(--text-secondary);
+  font-size: 13px;
+  white-space: nowrap;
+  transition: background 0.16s ease, color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
+}
+
+.mode-tab.active {
+  background: #fff;
+  color: var(--accent);
+  box-shadow: 0 1px 3px rgba(35, 53, 78, 0.12);
+}
+
+.mode-label-short {
+  display: none;
+}
+
+.model-picker {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  height: 36px;
+  padding: 0 10px;
+  border-radius: 12px;
+  background: #f8fafc;
+  border: 1px solid var(--border);
+  color: var(--text-secondary);
+  min-width: 0;
+  transition: background 0.16s ease, border-color 0.16s ease;
+}
+
+.model-picker:hover {
+  background: #fff;
+  border-color: var(--border-strong);
+}
+
+.model-picker:has(select:focus-visible) {
+  border-color: rgba(45, 102, 218, 0.54);
+  box-shadow: 0 0 0 2px rgba(45, 102, 218, 0.09);
+}
+
+.model-picker select {
+  width: 146px;
+  min-width: 0;
+  color: var(--text-primary);
+  font-size: 13px;
+  cursor: pointer;
+}
+
 .emoji-panel {
   position: absolute;
-  bottom: 100%;
-  left: 0;
-  margin-bottom: 8px;
+  bottom: 54px;
+  right: 48px;
   padding: 8px;
-  background: var(--bg-secondary);
+  background: #fff;
   border: 1px solid var(--border);
-  border-radius: 8px;
+  border-radius: 14px;
   display: grid;
   grid-template-columns: repeat(10, 1fr);
   gap: 2px;
-  box-shadow: var(--shadow);
-  z-index: 10;
+  box-shadow: 0 16px 44px rgba(31, 49, 78, 0.14);
+  z-index: 20;
 }
 
 .emoji-btn {
-  padding: 4px;
+  width: 31px;
+  height: 31px;
   font-size: 20px;
-  border-radius: 4px;
-}
-.emoji-btn:hover {
-  background: var(--bg-hover);
+  border-radius: 8px;
 }
 
-.input-textarea {
-  flex: 1;
-  resize: none;
-  max-height: 200px;
-  padding: 6px 0;
-  font-size: 15px;
-  line-height: 1.5;
+.emoji-btn:hover {
+  background: var(--bg-soft);
+}
+
+.model-status {
+  display: flex;
+  align-items: center;
+  gap: 5px;
+  margin-right: 2px;
+  font-size: 12px;
+  color: var(--text-secondary);
+  white-space: nowrap;
+}
+
+.model-status svg {
+  color: var(--accent);
 }
 
 .send-btn {
-  padding: 8px;
-  border-radius: 8px;
+  width: 38px;
+  height: 38px;
+  border-radius: 50%;
   background: var(--accent);
   color: white;
   flex-shrink: 0;
-  transition: opacity 0.2s;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: 0 5px 14px rgba(45, 102, 218, 0.24);
+  transition: background 0.16s ease, transform 0.16s ease, box-shadow 0.16s ease;
 }
+
 .send-btn:hover:not(:disabled) {
   background: var(--accent-hover);
+  box-shadow: 0 7px 18px rgba(45, 102, 218, 0.28);
 }
+
 .send-btn:disabled {
-  opacity: 0.4;
+  background: #e8edf3;
+  color: #9aa6b5;
+  box-shadow: none;
   cursor: not-allowed;
 }
 
 .input-hint {
   text-align: center;
-  font-size: 12px;
+  font-size: 11px;
   color: var(--text-muted);
   margin-top: 8px;
+  line-height: 1.4;
 }
 
 .input-hint-warn {
   color: var(--danger);
 }
+
+@media (max-width: 768px) {
+  .drop-overlay {
+    padding: 16px;
+  }
+
+  .drop-card {
+    width: 100%;
+    min-height: 210px;
+    padding: 28px 20px;
+    border-radius: 22px;
+  }
+
+  .chat-input-area {
+    padding: 8px 12px calc(10px + env(safe-area-inset-bottom));
+  }
+
+  .input-wrapper {
+    border-radius: 18px;
+  }
+
+  .agent-panel {
+    bottom: calc(100% + 8px);
+    max-height: min(57dvh, 460px);
+    padding: 14px;
+    border-radius: 18px;
+  }
+
+  .agent-panel-header {
+    gap: 12px;
+    padding-bottom: 11px;
+  }
+
+  .agent-panel-header h3 {
+    font-size: 16px;
+  }
+
+  .agent-panel-header p {
+    max-width: 270px;
+    font-size: 11px;
+  }
+
+  .agent-option {
+    min-height: 64px;
+    gap: 10px;
+    padding: 8px 7px 8px 6px;
+  }
+
+  .agent-option-icon {
+    width: 38px;
+    height: 38px;
+    border-radius: 11px;
+  }
+
+  .agent-option-copy small {
+    margin-top: 3px;
+    font-size: 11px;
+  }
+
+  .agent-tag {
+    display: none;
+  }
+
+  .agent-panel-footer {
+    align-items: stretch;
+    flex-direction: column;
+    gap: 6px;
+    padding-top: 11px;
+  }
+
+  .agent-starters {
+    flex-wrap: nowrap;
+    overflow-x: auto;
+    scrollbar-width: none;
+  }
+
+  .agent-starters > span {
+    display: none;
+  }
+
+  .agent-starters button {
+    flex: 0 0 auto;
+    max-width: 86%;
+  }
+
+  .agent-disable {
+    align-self: flex-end;
+  }
+
+  .active-agent-strip {
+    min-height: 44px;
+    margin: 7px 8px 0;
+    padding: 5px 6px;
+  }
+
+  .active-agent-icon {
+    width: 32px;
+    height: 32px;
+  }
+
+  .active-agent-copy small {
+    max-width: 42vw;
+  }
+
+  .input-textarea {
+    min-height: 66px;
+    padding: 14px 12px 8px;
+    font-size: 16px;
+    line-height: 1.5;
+  }
+
+  .toolbar-row {
+    display: grid;
+    grid-template-columns: minmax(0, 1fr) auto;
+    gap: 6px;
+    padding: 7px 8px 8px;
+  }
+
+  .toolbar-primary {
+    gap: 5px;
+    overflow: hidden;
+  }
+
+  .toolbar-secondary {
+    gap: 4px;
+  }
+
+  .mode-switch,
+  .model-picker,
+  .agent-trigger {
+    height: 34px;
+  }
+
+  .agent-trigger {
+    width: 34px;
+    padding: 0;
+    border-radius: 11px;
+  }
+
+  .agent-trigger-label,
+  .agent-live-dot {
+    display: none;
+  }
+
+  .mode-tab {
+    height: 28px;
+    padding: 0 8px;
+    gap: 5px;
+  }
+
+  .mode-label-full {
+    display: none;
+  }
+
+  .mode-label-short {
+    display: inline;
+  }
+
+  .model-picker {
+    flex: 1;
+    padding: 0 8px;
+    overflow: hidden;
+  }
+
+  .model-picker select {
+    width: 100%;
+    text-overflow: ellipsis;
+  }
+
+  .model-status,
+  .emoji-toggle {
+    display: none;
+  }
+
+  .emoji-panel {
+    right: 8px;
+    left: 8px;
+    bottom: 50px;
+    grid-template-columns: repeat(8, 1fr);
+  }
+
+  .emoji-btn {
+    width: 100%;
+  }
+
+  .input-hint {
+    margin-top: 6px;
+  }
+}
+
+@media (max-width: 360px) {
+  .mode-tab {
+    padding: 0 6px;
+    gap: 4px;
+  }
+
+  .mode-tab > svg,
+  .model-picker > svg {
+    display: none;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .drop-overlay,
+  .drop-overlay .drop-card,
+  .input-wrapper,
+  .icon-btn,
+  .mode-tab,
+  .model-picker,
+  .send-btn,
+  .agent-panel,
+  .agent-option,
+  .agent-trigger,
+  .upload-progress-fill {
+    transition: none;
+  }
+}
 </style>
diff --git a/frontend/src/components/ChatSidebar.vue b/frontend/src/components/ChatSidebar.vue
index e28c03c..956b0ba 100644
--- a/frontend/src/components/ChatSidebar.vue
+++ b/frontend/src/components/ChatSidebar.vue
@@ -1,47 +1,50 @@
 <template>
-  <aside class="sidebar" :class="{ open: chat.sidebarOpen }">
+  <aside class="sidebar" :class="{ open: chat.sidebarOpen }" aria-label="会话列表">
     <div class="sidebar-top">
-      <select
-        v-if="settings.models.length"
-        class="model-select"
-        title="选择模型"
-        :value="chat.selectedModelId == null ? '' : String(chat.selectedModelId)"
-        @change="onModelChange"
-      >
-        <option
-          v-for="m in settings.models"
-          :key="m.id"
-          :value="String(m.id)"
-        >{{ m.name }}{{ m.provider === 'comfy' ? ' · 生图' : '' }}</option>
-      </select>
-      <button class="new-chat-btn" @click="handleNewChat">
-        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-          <path d="M12 5v14M5 12h14"/>
-        </svg>
-        新对话
+      <div class="sidebar-brand">
+        <span class="brand-badge">AI</span>
+        <div class="brand-copy">
+          <strong>{{ settings.siteName || 'AI Chat' }}</strong>
+          <p>统一文本与图片创作</p>
+        </div>
+        <button class="sidebar-close" type="button" aria-label="关闭会话列表" @click="chat.closeSidebar">
+          <IconX :size="19" :stroke-width="1.8" />
+        </button>
+      </div>
+
+      <button class="new-chat-btn" type="button" @click="handleNewChat">
+        <IconPlus :size="18" :stroke-width="1.9" />
+        开始新对话
       </button>
     </div>
 
     <div class="conversation-list">
+      <div class="conversation-heading">
+        <span>最近对话</span>
+        <span>{{ chat.conversations.length }}</span>
+      </div>
+
       <div
         v-for="conv in chat.conversations"
         :key="conv.id"
         class="conversation-item"
         :class="{ active: conv.id === chat.currentId }"
+        :aria-current="conv.id === chat.currentId ? 'page' : undefined"
         @click="selectConv(conv.id)"
       >
-        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-          <path d="M21 15a2 2 0 01-2 2H7l-4 4V5a2 2 0 012-2h14a2 2 0 012 2z"/>
-        </svg>
+        <IconMessageCircle class="conversation-icon" :size="17" :stroke-width="1.7" />
         <span class="conv-title">{{ conv.title }}</span>
-        <button class="delete-btn" @click.stop="handleDelete(conv.id)" title="删除">
-          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-            <path d="M18 6L6 18M6 6l12 12"/>
-          </svg>
+        <button
+          class="delete-btn"
+          type="button"
+          :aria-label="`删除对话：${conv.title}`"
+          @click.stop="handleDelete(conv.id)"
+        >
+          <IconTrash :size="15" :stroke-width="1.8" />
         </button>
       </div>
 
-      <p v-if="!chat.conversations.length" class="empty-tip">暂无对话，点击上方开始</p>
+      <p v-if="!chat.conversations.length" class="empty-tip">还没有会话，先创建一个新对话</p>
     </div>
 
     <div class="sidebar-footer">
@@ -49,27 +52,27 @@
         <div class="avatar">{{ avatarLetter }}</div>
         <div class="user-meta">
           <span class="user-name">{{ auth.user?.nickname || auth.user?.username }}</span>
-          <span class="user-level">{{ auth.user?.membership_name }}</span>
+          <span class="user-level">{{ auth.isGuest ? '游客模式 · 自动保存' : (auth.user?.membership_name || '普通用户') }}</span>
         </div>
       </div>
-      <a
-        v-if="auth.user?.role === 'admin'"
-        :href="adminUrl"
-        target="_blank"
-        class="admin-entry"
-      >⚙️ 进入管理后台</a>
     </div>
   </aside>
 </template>
 
 <script setup>
 import { computed, watch } from 'vue'
+import IconMessageCircle from '@tabler/icons-vue/dist/esm/icons/IconMessageCircle.mjs'
+import IconPlus from '@tabler/icons-vue/dist/esm/icons/IconPlus.mjs'
+import IconTrash from '@tabler/icons-vue/dist/esm/icons/IconTrash.mjs'
+import IconX from '@tabler/icons-vue/dist/esm/icons/IconX.mjs'
 import { useAuthStore } from '@/stores/auth'
 import { useChatStore } from '@/stores/chat'
+import { useNotificationStore } from '@/stores/notification'
 import { useSettingsStore } from '@/stores/settings'
 
 const auth = useAuthStore()
 const chat = useChatStore()
+const notification = useNotificationStore()
 const settings = useSettingsStore()
 
 const avatarLetter = computed(() => {
@@ -77,8 +80,6 @@ const avatarLetter = computed(() => {
   return name.charAt(0).toUpperCase()
 })
 
-const adminUrl = import.meta.env.VITE_ADMIN_URL || `${window.location.protocol}//${window.location.hostname}:5174`
-
 watch(
   () => settings.models,
   (list) => {
@@ -90,28 +91,31 @@ watch(
   { immediate: true }
 )
 
-async function onModelChange(e) {
-  const value = e.target.value
+async function handleNewChat() {
   try {
-    await chat.setSelectedModel(value === '' ? null : Number(value))
+    await chat.createConversation(chat.selectedModelId)
+    chat.closeSidebar()
   } catch (err) {
-    alert(err.message || '切换模型失败')
+    notification.error(err, { title: '创建对话失败' })
   }
 }
 
-async function handleNewChat() {
-  await chat.createConversation(chat.selectedModelId)
-  chat.closeSidebar()
-}
-
 async function selectConv(id) {
-  await chat.selectConversation(id)
-  chat.closeSidebar()
+  try {
+    await chat.selectConversation(id)
+    chat.closeSidebar()
+  } catch (err) {
+    notification.error(err, { title: '加载对话失败' })
+  }
 }
 
 async function handleDelete(id) {
-  if (confirm('确定删除此对话？')) {
-    await chat.deleteConversation(id)
+  if (confirm('确定删除此对话吗？')) {
+    try {
+      await chat.deleteConversation(id)
+    } catch (err) {
+      notification.error(err, { title: '删除对话失败' })
+    }
   }
 }
 </script>
@@ -119,104 +123,196 @@ async function handleDelete(id) {
 <style scoped>
 .sidebar {
   width: var(--sidebar-width);
-  background: var(--bg-secondary);
+  background: rgba(255, 255, 255, 0.94);
   border-right: 1px solid var(--border);
   display: flex;
   flex-direction: column;
   flex-shrink: 0;
-  transition: transform 0.3s ease;
+  transition: transform 0.24s cubic-bezier(0.16, 1, 0.3, 1);
+  backdrop-filter: blur(14px);
 }
 
 .sidebar-top {
-  padding: 12px;
+  padding: 16px 14px 12px;
   display: flex;
   flex-direction: column;
-  gap: 8px;
+  gap: 14px;
 }
 
-.model-select {
-  width: 100%;
-  padding: 8px 12px;
-  background: var(--bg-tertiary);
-  border: 1px solid var(--border);
-  border-radius: 8px;
-  font-size: 13px;
+.sidebar-brand {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  min-height: 40px;
+  padding: 2px;
+}
+
+.brand-badge {
+  width: 38px;
+  height: 38px;
+  border-radius: 12px;
+  background: var(--accent-soft);
+  border: 1px solid #d9e6fb;
+  color: var(--accent);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 14px;
+  font-weight: 700;
+  letter-spacing: -0.02em;
+  flex-shrink: 0;
+}
+
+.brand-copy {
+  min-width: 0;
+  flex: 1;
+}
+
+.sidebar-brand strong {
+  display: block;
+  overflow: hidden;
   color: var(--text-primary);
+  font-size: 14px;
+  font-weight: 650;
+  line-height: 1.35;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.sidebar-brand p {
+  margin-top: 2px;
+  color: var(--text-muted);
+  font-size: 11px;
+  line-height: 1.3;
+}
+
+.sidebar-close {
+  display: none;
+  width: 34px;
+  height: 34px;
+  align-items: center;
+  justify-content: center;
+  border-radius: 50%;
+  color: var(--text-secondary);
 }
 
 .new-chat-btn {
   display: flex;
   align-items: center;
-  gap: 8px;
+  justify-content: center;
+  gap: 7px;
   width: 100%;
-  padding: 12px 16px;
-  background: var(--bg-tertiary);
-  border: 1px solid var(--border);
-  border-radius: 8px;
-  font-size: 14px;
-  color: var(--text-primary);
-  transition: background 0.2s;
+  min-height: 42px;
+  padding: 0 14px;
+  background: var(--accent);
+  border-radius: 12px;
+  color: #fff;
+  font-size: 13px;
+  font-weight: 600;
+  box-shadow: 0 7px 18px rgba(45, 102, 218, 0.2);
+  transition: background 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
 }
+
 .new-chat-btn:hover {
-  background: var(--bg-hover);
+  background: var(--accent-hover);
+  box-shadow: 0 9px 22px rgba(45, 102, 218, 0.24);
+}
+
+.new-chat-btn:active {
+  transform: scale(0.98);
 }
 
 .conversation-list {
   flex: 1;
   overflow-y: auto;
-  padding: 4px 8px;
+  padding: 6px 9px 12px;
+}
+
+.conversation-heading {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 8px 9px 7px;
+  color: var(--text-muted);
+  font-size: 11px;
 }
 
 .conversation-item {
+  position: relative;
   display: flex;
   align-items: center;
-  gap: 10px;
-  padding: 10px 12px;
-  border-radius: 8px;
+  gap: 9px;
+  min-height: 42px;
+  margin-bottom: 2px;
+  padding: 8px 8px 8px 10px;
+  border-radius: 10px;
   cursor: pointer;
-  font-size: 14px;
   color: var(--text-secondary);
-  transition: all 0.15s;
+  font-size: 13px;
+  transition: background 0.15s ease, color 0.15s ease;
 }
+
 .conversation-item:hover {
-  background: var(--bg-hover);
-  color: var(--text-primary);
-}
-.conversation-item.active {
   background: var(--bg-tertiary);
   color: var(--text-primary);
 }
 
+.conversation-item.active {
+  background: var(--accent-soft);
+  box-shadow: inset 3px 0 0 var(--accent);
+  color: var(--text-primary);
+  font-weight: 500;
+}
+
+.conversation-icon {
+  color: var(--text-muted);
+  flex-shrink: 0;
+}
+
+.conversation-item.active .conversation-icon {
+  color: var(--accent);
+}
+
 .conv-title {
   flex: 1;
-  white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
+  white-space: nowrap;
 }
 
 .delete-btn {
-  opacity: 0;
-  padding: 4px;
-  border-radius: 4px;
+  width: 28px;
+  height: 28px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 50%;
   color: var(--text-muted);
+  opacity: 0;
+  flex-shrink: 0;
+  transition: background 0.15s ease, color 0.15s ease, opacity 0.15s ease;
 }
-.conversation-item:hover .delete-btn {
+
+.conversation-item:hover .delete-btn,
+.delete-btn:focus-visible {
   opacity: 1;
 }
+
 .delete-btn:hover {
+  background: #fff0f0;
   color: var(--danger);
-  background: rgba(239, 68, 68, 0.1);
 }
 
 .empty-tip {
-  text-align: center;
-  padding: 24px 16px;
-  font-size: 13px;
+  padding: 26px 18px;
   color: var(--text-muted);
+  font-size: 12px;
+  line-height: 1.6;
+  text-align: center;
 }
 
 .sidebar-footer {
-  padding: 12px;
+  padding: 10px 12px 12px;
   border-top: 1px solid var(--border);
 }
 
@@ -224,63 +320,73 @@ async function handleDelete(id) {
   display: flex;
   align-items: center;
   gap: 10px;
-  padding: 8px;
+  padding: 6px;
 }
 
 .avatar {
-  width: 32px;
-  height: 32px;
-  border-radius: 50%;
-  background: var(--accent);
+  width: 34px;
+  height: 34px;
+  border-radius: 11px;
+  background: #eef1f6;
+  color: var(--text-primary);
   display: flex;
   align-items: center;
   justify-content: center;
-  font-size: 14px;
-  font-weight: 600;
-  color: white;
+  font-size: 13px;
+  font-weight: 650;
+  flex-shrink: 0;
 }
 
 .user-meta {
   display: flex;
   flex-direction: column;
+  min-width: 0;
 }
 
 .user-name {
-  font-size: 14px;
-  font-weight: 500;
+  overflow: hidden;
+  color: var(--text-primary);
+  font-size: 13px;
+  font-weight: 550;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 
 .user-level {
-  font-size: 12px;
+  margin-top: 2px;
   color: var(--text-muted);
-}
-
-.admin-entry {
-  display: block;
-  margin-top: 8px;
-  padding: 10px 12px;
-  text-align: center;
-  font-size: 13px;
-  color: var(--accent);
-  background: rgba(16, 163, 127, 0.1);
-  border-radius: 8px;
-  text-decoration: none;
-}
-.admin-entry:hover {
-  background: rgba(16, 163, 127, 0.2);
+  font-size: 11px;
 }
 
 @media (max-width: 768px) {
   .sidebar {
     position: fixed;
-    top: 0;
-    left: 0;
-    bottom: 0;
+    inset: 0 auto 0 0;
     z-index: 100;
+    width: min(84vw, 304px);
     transform: translateX(-100%);
+    box-shadow: 20px 0 50px rgba(21, 32, 51, 0.14);
   }
+
   .sidebar.open {
     transform: translateX(0);
   }
+
+  .sidebar-close {
+    display: flex;
+  }
+
+  .delete-btn {
+    opacity: 0.68;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .sidebar,
+  .new-chat-btn,
+  .conversation-item,
+  .delete-btn {
+    transition: none;
+  }
 }
 </style>
diff --git a/frontend/src/components/MessageItem.vue b/frontend/src/components/MessageItem.vue
index 28aacc4..b6ab096 100644
--- a/frontend/src/components/MessageItem.vue
+++ b/frontend/src/components/MessageItem.vue
@@ -1,16 +1,16 @@
 <template>
-  <div class="message" :class="message.role">
-    <div class="message-avatar">
-      {{ message.role === 'user' ? 'U' : 'AI' }}
+  <div class="message" :class="[message.role, { streaming: isStreaming }]">
+    <div class="message-avatar" aria-hidden="true">
+      <IconUser v-if="message.role === 'user'" :size="16" :stroke-width="1.8" />
+      <IconSparkles v-else :size="16" :stroke-width="1.8" />
     </div>
     <div class="message-body">
-      <!-- 附件 -->
       <div v-if="attachments.length" class="attachments">
         <template v-for="(att, i) in attachments" :key="i">
           <img
             v-if="att?.type === 'image' && features.image && !brokenImages[i]"
             :src="att.url"
-            :alt="att.name"
+            :alt="att.name || '生成图片'"
             class="att-image"
             @error="markBroken(i)"
             @click="previewImage(att.url)"
@@ -22,7 +22,8 @@
             rel="noopener"
             class="att-document"
           >
-            🖼️ {{ att.name || '图片' }}（点击打开）
+            <IconPhoto :size="17" :stroke-width="1.8" />
+            {{ att.name || '打开图片' }}
           </a>
           <video
             v-else-if="att?.type === 'video' && features.video"
@@ -40,26 +41,48 @@
             v-else-if="att?.type === 'document' && features.document"
             :href="att.url"
             target="_blank"
+            rel="noopener"
             class="att-document"
           >
-            {{ documentIcon(att) }} {{ att.name }} ({{ formatFileSize(att.size) }})
+            <IconFileText :size="17" :stroke-width="1.8" />
+            <span class="document-name">{{ att.name }}</span>
+            <span class="document-size">{{ formatFileSize(att.size) }}</span>
           </a>
         </template>
       </div>
 
-      <!-- 文本内容 -->
       <div
         v-if="message.content"
         class="message-content"
         :class="{ 'markdown-body': useMarkdown }"
         v-html="renderedContent"
       />
+
+      <div v-if="message.content && !isStreaming" class="message-actions">
+        <button
+          class="message-action-btn"
+          type="button"
+          :aria-label="copied ? '消息内容已复制' : '复制消息内容'"
+          @click="copyContent"
+        >
+          <IconCheck v-if="copied" :size="15" :stroke-width="2" />
+          <IconCopy v-else :size="15" :stroke-width="1.8" />
+          <span>{{ copied ? '已复制' : '复制' }}</span>
+        </button>
+      </div>
     </div>
   </div>
 </template>
 
 <script setup>
-import { computed, reactive } from 'vue'
+import { computed, reactive, ref, onBeforeUnmount } from 'vue'
+import IconCheck from '@tabler/icons-vue/dist/esm/icons/IconCheck.mjs'
+import IconCopy from '@tabler/icons-vue/dist/esm/icons/IconCopy.mjs'
+import IconFileText from '@tabler/icons-vue/dist/esm/icons/IconFileText.mjs'
+import IconPhoto from '@tabler/icons-vue/dist/esm/icons/IconPhoto.mjs'
+import IconSparkles from '@tabler/icons-vue/dist/esm/icons/IconSparkles.mjs'
+import IconUser from '@tabler/icons-vue/dist/esm/icons/IconUser.mjs'
+import { useNotificationStore } from '@/stores/notification'
 import { useSettingsStore } from '@/stores/settings'
 import { renderMarkdown, formatFileSize } from '@/utils/markdown'
 
@@ -69,7 +92,14 @@ const props = defineProps({
 })
 
 const settings = useSettingsStore()
+const notification = useNotificationStore()
 const features = computed(() => settings.features)
+const copied = ref(false)
+let copiedTimer = null
+
+onBeforeUnmount(() => {
+  if (copiedTimer) clearTimeout(copiedTimer)
+})
 
 const attachments = computed(() => {
   const raw = props.message.attachments
@@ -77,14 +107,6 @@ const attachments = computed(() => {
   return list.filter(att => att && typeof att === 'object')
 })
 
-function documentIcon(att) {
-  const name = (att?.name || '').toLowerCase()
-  const mime = att?.mime || ''
-  if (name.endsWith('.pdf') || mime.includes('pdf')) return '📕'
-  if (name.endsWith('.doc') || name.endsWith('.docx') || mime.includes('word')) return '📘'
-  return '📄'
-}
-
 const useMarkdown = computed(() => {
   return features.value.markdown && props.message.role === 'assistant'
 })
@@ -110,7 +132,58 @@ function markBroken(index) {
 }
 
 function previewImage(url) {
-  window.open(url, '_blank')
+  window.open(url, '_blank', 'noopener')
+}
+
+function legacyCopy(text) {
+  const textarea = document.createElement('textarea')
+  textarea.value = text
+  textarea.setAttribute('readonly', '')
+  textarea.style.position = 'fixed'
+  textarea.style.inset = '-9999px auto auto -9999px'
+  document.body.appendChild(textarea)
+  textarea.select()
+  const success = document.execCommand('copy')
+  textarea.remove()
+  if (!success) throw new Error('浏览器未允许复制')
+}
+
+async function copyContent() {
+  const text = String(props.message.content || '')
+  if (!text) return
+
+  let success = false
+  try {
+    if (navigator.clipboard?.writeText) {
+      await navigator.clipboard.writeText(text)
+    } else {
+      legacyCopy(text)
+    }
+    success = true
+  } catch {
+    try {
+      legacyCopy(text)
+      success = true
+    } catch {
+      success = false
+    }
+  }
+
+  if (!success) {
+    notification.show({
+      type: 'error',
+      title: '复制失败',
+      message: '浏览器未允许访问剪贴板，请直接选中消息文字后复制。',
+      duration: 4500
+    })
+    return
+  }
+
+  copied.value = true
+  if (copiedTimer) clearTimeout(copiedTimer)
+  copiedTimer = setTimeout(() => {
+    copied.value = false
+  }, 1800)
 }
 </script>
 
@@ -118,51 +191,48 @@ function previewImage(url) {
 .message {
   display: flex;
   gap: 10px;
+  width: 100%;
   max-width: var(--input-max-width);
-  margin: 0 auto 20px;
-  padding: 0 8px;
-}
-
-.message.assistant {
-  justify-content: flex-start;
+  margin: 0 auto 30px;
+  padding: 0 10px;
 }
 
 .message.user {
   flex-direction: row-reverse;
-  justify-content: flex-start;
 }
 
 .message-avatar {
-  width: 32px;
-  height: 32px;
-  border-radius: 50%;
+  width: 30px;
+  height: 30px;
+  border-radius: 10px;
   display: flex;
   align-items: center;
   justify-content: center;
-  font-size: 12px;
-  font-weight: 600;
   flex-shrink: 0;
+  border: 1px solid var(--border);
 }
 
 .message.user .message-avatar {
-  background: #5436da;
-  color: white;
+  background: #edf1f6;
+  color: var(--text-secondary);
 }
 
 .message.assistant .message-avatar {
-  background: var(--accent);
-  color: white;
+  background: var(--accent-soft);
+  border-color: #dbe7fa;
+  color: var(--accent);
 }
 
 .message-body {
   display: flex;
   flex-direction: column;
   min-width: 0;
-  max-width: 78%;
-  padding-top: 2px;
+  max-width: 84%;
+  padding-top: 1px;
 }
 
 .message.user .message-body {
+  max-width: 76%;
   align-items: flex-end;
 }
 
@@ -173,36 +243,93 @@ function previewImage(url) {
 .message-content {
   display: inline-block;
   max-width: 100%;
+  color: var(--text-primary);
   font-size: 15px;
-  line-height: 1.7;
-  padding: 10px 14px;
-  border-radius: 16px;
+  line-height: 1.75;
+  cursor: text;
+  user-select: text;
+}
+
+.message-actions {
+  display: flex;
+  width: 100%;
+  height: 0;
+  justify-content: flex-start;
+  opacity: 0;
+  pointer-events: none;
+  transform: translateY(4px);
+  transition: opacity 0.16s ease;
+}
+
+.message.user .message-actions {
+  justify-content: flex-end;
+}
+
+.message:hover .message-actions,
+.message:focus-within .message-actions {
+  opacity: 1;
+  pointer-events: auto;
+}
+
+.message-action-btn {
+  min-height: 28px;
+  padding: 0 8px;
+  border-radius: 8px;
+  color: var(--text-muted);
+  display: inline-flex;
+  align-items: center;
+  gap: 5px;
+  font-size: 11px;
+  font-weight: 550;
+  white-space: nowrap;
+  transition: color 0.16s ease, background 0.16s ease, transform 0.16s ease;
+}
+
+.message-action-btn:hover,
+.message-action-btn:focus-visible {
+  background: #fff;
+  color: var(--accent);
+}
+
+.message-action-btn:active {
+  transform: scale(0.96);
 }
 
 .message.user .message-content {
-  background: var(--accent);
-  color: #fff;
-  border-radius: 16px 16px 4px 16px;
+  padding: 11px 14px;
+  background: var(--accent-soft);
+  border: 1px solid #dbe7fa;
+  border-radius: 16px 16px 5px 16px;
 }
 
 .message.assistant .message-content {
-  background: var(--bg-tertiary);
-  color: var(--text-primary);
-  border-radius: 16px 16px 16px 4px;
+  padding: 3px 1px;
+}
+
+.message.streaming .message-content::after {
+  content: '';
+  display: inline-block;
+  width: 2px;
+  height: 15px;
+  margin-left: 3px;
+  border-radius: 1px;
+  background: var(--accent);
+  vertical-align: -2px;
+  animation: cursor-blink 0.9s step-end infinite;
 }
 
 .message-content :deep(pre) {
-  background: var(--bg-secondary);
+  background: #f6f8fb;
+  border-color: var(--border);
 }
 
 .message.user .message-content :deep(pre),
 .message.user .message-content :deep(:not(pre) > code) {
-  background: rgba(0, 0, 0, 0.2);
+  background: rgba(255, 255, 255, 0.72);
 }
 
 .message.user .message-content :deep(a) {
-  color: #fff;
-  text-decoration: underline;
+  color: var(--accent);
 }
 
 .attachments {
@@ -217,49 +344,118 @@ function previewImage(url) {
 }
 
 .att-image {
-  max-width: 240px;
-  max-height: 240px;
-  border-radius: 8px;
-  cursor: pointer;
+  display: block;
+  width: auto;
+  max-width: min(100%, 460px);
+  max-height: 520px;
+  border-radius: 16px;
+  border: 1px solid var(--border-strong);
+  box-shadow: 0 12px 32px rgba(38, 59, 92, 0.1);
+  cursor: zoom-in;
   object-fit: cover;
 }
 
+.message.user .att-image {
+  max-width: min(100%, 300px);
+  max-height: 360px;
+}
+
 .att-video {
-  max-width: 360px;
-  max-height: 240px;
-  border-radius: 8px;
+  width: min(100%, 460px);
+  max-height: 320px;
+  border-radius: 16px;
 }
 
 .att-audio {
   width: 100%;
-  max-width: 360px;
+  max-width: 380px;
 }
 
 .att-document {
   display: inline-flex;
   align-items: center;
-  gap: 6px;
-  padding: 8px 12px;
-  background: var(--bg-tertiary);
-  border-radius: 8px;
-  font-size: 13px;
+  gap: 7px;
+  max-width: 360px;
+  padding: 9px 11px;
+  background: #fff;
+  border: 1px solid var(--border);
+  border-radius: 12px;
   color: var(--text-primary);
+  font-size: 13px;
+  transition: background 0.15s ease, border-color 0.15s ease;
 }
+
 .att-document:hover {
-  background: var(--bg-hover);
+  background: var(--bg-tertiary);
+  border-color: var(--border-strong);
+}
+
+.document-name {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.document-size {
+  color: var(--text-muted);
+  font-size: 11px;
+  white-space: nowrap;
+}
+
+@keyframes cursor-blink {
+  0%, 45% { opacity: 1; }
+  46%, 100% { opacity: 0; }
 }
 
 @media (max-width: 768px) {
   .message {
     gap: 8px;
-    margin-bottom: 16px;
+    margin-bottom: 26px;
+    padding: 0 2px;
   }
-  .message-body {
-    max-width: 85%;
+
+  .message-avatar {
+    width: 28px;
+    height: 28px;
+    border-radius: 9px;
   }
-  .att-image {
-    max-width: 180px;
-    max-height: 180px;
+
+  .message-body,
+  .message.user .message-body {
+    max-width: calc(100% - 38px);
+  }
+
+  .message-content {
+    font-size: 14px;
+    line-height: 1.7;
+  }
+
+  .message.user .message-content {
+    padding: 10px 12px;
+  }
+
+  .message-actions {
+    opacity: 1;
+    pointer-events: auto;
+  }
+
+  .att-image,
+  .message.user .att-image {
+    max-width: 100%;
+    max-height: 420px;
+    border-radius: 14px;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .message-actions,
+  .message-action-btn,
+  .message.streaming .message-content::after {
+    animation: none;
+  }
+
+  .att-document {
+    transition: none;
   }
 }
 </style>
diff --git a/frontend/src/components/MessageList.vue b/frontend/src/components/MessageList.vue
index a613e1d..4017f25 100644
--- a/frontend/src/components/MessageList.vue
+++ b/frontend/src/components/MessageList.vue
@@ -1,33 +1,66 @@
 <template>
-  <div class="message-list" ref="listRef">
-    <div v-if="!visibleMessages.length && !loading && !sending && !hasStreaming" class="welcome">
-      <div class="welcome-icon">💬</div>
-      <h2>有什么可以帮您的？</h2>
-      <p>输入消息开始对话，支持 Markdown、图片、文件等</p>
+  <div class="message-list-shell">
+    <div
+      ref="listRef"
+      class="message-list"
+      @scroll.passive="handleScroll"
+      @wheel.passive="handleWheel"
+      @touchstart.passive="handleTouchStart"
+      @touchmove.passive="handleTouchMove"
+    >
+      <div v-if="!visibleMessages.length && !loading && !sending && !hasStreaming" class="welcome">
+        <div class="welcome-panel">
+          <div class="welcome-icon" aria-hidden="true">
+            <IconSparkles :size="25" :stroke-width="1.7" />
+          </div>
+          <h2>一个输入框，完成对话与图片创作</h2>
+          <p>选择语言模型或图片生成模型，描述你的需求就可以开始。</p>
+        </div>
+      </div>
+
+      <div v-if="loading" class="loading-state" aria-label="正在加载会话">
+        <span></span>
+        <span></span>
+        <span></span>
+      </div>
+
+      <MessageItem
+        v-for="msg in visibleMessages"
+        :key="msg.id"
+        :message="msg"
+      />
+
+      <MessageItem
+        v-if="hasStreaming"
+        :message="{ role: 'assistant', content: streaming, content_type: 'mixed', attachments: streamingAttachments }"
+        :is-streaming="true"
+      />
+
+      <div v-if="sending && !hasStreaming" class="typing-indicator" aria-label="AI 正在回复">
+        <span></span><span></span><span></span>
+      </div>
     </div>
 
-    <div v-if="loading" class="loading-state">加载中...</div>
-
-    <MessageItem
-      v-for="msg in visibleMessages"
-      :key="msg.id"
-      :message="msg"
-    />
-
-    <MessageItem
-      v-if="hasStreaming"
-      :message="{ role: 'assistant', content: streaming, content_type: 'mixed', attachments: streamingAttachments }"
-      :is-streaming="true"
-    />
-
-    <div v-if="sending && !hasStreaming" class="typing-indicator">
-      <span></span><span></span><span></span>
-    </div>
+    <Transition name="scroll-button">
+      <button
+        v-if="showScrollButton"
+        class="scroll-bottom-btn"
+        type="button"
+        aria-label="回到最新消息"
+        title="回到最新消息"
+        @click="resumeAutoScroll"
+      >
+        <IconArrowDown :size="18" :stroke-width="2" />
+        <span>回到最新</span>
+      </button>
+    </Transition>
   </div>
 </template>
 
 <script setup>
 import { ref, watch, nextTick, computed } from 'vue'
+import IconArrowDown from '@tabler/icons-vue/dist/esm/icons/IconArrowDown.mjs'
+import IconSparkles from '@tabler/icons-vue/dist/esm/icons/IconSparkles.mjs'
 import MessageItem from './MessageItem.vue'
 
 const props = defineProps({
@@ -39,6 +72,11 @@ const props = defineProps({
 })
 
 const listRef = ref(null)
+const autoScrollEnabled = ref(true)
+const isAtBottom = ref(true)
+let touchY = null
+
+const BOTTOM_EPSILON = 2
 
 const hasStreaming = computed(() => {
   const hasText = !!(props.streaming && String(props.streaming).trim())
@@ -50,78 +88,306 @@ const visibleMessages = computed(() => {
   return props.messages.filter(msg => {
     const hasContent = !!(msg.content && String(msg.content).trim())
     const attachments = msg.attachments || []
-    const hasAttachments = Array.isArray(attachments) && attachments.length > 0
+    const hasAttachments = Array.isArray(attachments) ? attachments.length > 0 : false
     return hasContent || hasAttachments
   })
 })
 
+const showScrollButton = computed(() => {
+  return !isAtBottom.value && (visibleMessages.value.length > 0 || hasStreaming.value)
+})
+
+function distanceFromBottom() {
+  const el = listRef.value
+  if (!el) return 0
+  return Math.max(0, el.scrollHeight - el.clientHeight - el.scrollTop)
+}
+
+function handleScroll() {
+  const atBottom = distanceFromBottom() <= BOTTOM_EPSILON
+  isAtBottom.value = atBottom
+  autoScrollEnabled.value = atBottom
+}
+
+function pauseAutoScroll() {
+  autoScrollEnabled.value = false
+  isAtBottom.value = false
+}
+
+function handleWheel(event) {
+  if (event.deltaY < 0) pauseAutoScroll()
+}
+
+function handleTouchStart(event) {
+  touchY = event.touches?.[0]?.clientY ?? null
+}
+
+function handleTouchMove(event) {
+  const currentY = event.touches?.[0]?.clientY
+  if (currentY == null || touchY == null) return
+  if (currentY > touchY + 2) pauseAutoScroll()
+  touchY = currentY
+}
+
+function scrollToBottom() {
+  const el = listRef.value
+  if (!el) return
+
+  el.scrollTop = el.scrollHeight
+  isAtBottom.value = true
+}
+
+function resumeAutoScroll() {
+  autoScrollEnabled.value = true
+  scrollToBottom()
+}
+
 watch(
-  () => [props.messages.length, props.streaming, props.streamingAttachments?.length],
+  () => {
+    const last = visibleMessages.value[visibleMessages.value.length - 1]
+    return [visibleMessages.value.length, last?.id, last?.role]
+  },
+  async () => {
+    const last = visibleMessages.value[visibleMessages.value.length - 1]
+    if (last?.role === 'user') {
+      autoScrollEnabled.value = true
+    }
+    await nextTick()
+    if (autoScrollEnabled.value) scrollToBottom()
+  }
+)
+
+watch(
+  () => [props.streaming, props.streamingAttachments?.length, props.sending],
   async () => {
     await nextTick()
-    if (listRef.value) {
-      listRef.value.scrollTop = listRef.value.scrollHeight
-    }
+    if (autoScrollEnabled.value) scrollToBottom()
+  }
+)
+
+watch(
+  () => props.loading,
+  async (loading, previousLoading) => {
+    if (loading || !previousLoading) return
+    autoScrollEnabled.value = true
+    await nextTick()
+    scrollToBottom()
   }
 )
 </script>
 
 <style scoped>
-.message-list {
+.message-list-shell {
+  position: relative;
   flex: 1;
+  min-height: 0;
+}
+
+.message-list {
+  width: 100%;
+  height: 100%;
   overflow-y: auto;
-  padding: 24px 16px;
+  overscroll-behavior: contain;
+  padding: 24px 24px 18px;
+}
+
+.scroll-bottom-btn {
+  position: absolute;
+  left: 50%;
+  bottom: 12px;
+  z-index: 12;
+  min-height: 38px;
+  padding: 0 14px;
+  border: 1px solid var(--border-strong);
+  border-radius: 999px;
+  background: rgba(255, 255, 255, 0.96);
+  box-shadow: 0 10px 30px rgba(38, 59, 92, 0.14);
+  color: var(--text-secondary);
+  display: inline-flex;
+  align-items: center;
+  gap: 7px;
+  font-size: 12px;
+  font-weight: 600;
+  transform: translateX(-50%);
+  backdrop-filter: blur(10px);
+  transition: color 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
+}
+
+.scroll-bottom-btn:hover {
+  color: var(--accent);
+  border-color: rgba(45, 102, 218, 0.32);
+  box-shadow: 0 12px 34px rgba(38, 59, 92, 0.18);
+  transform: translateX(-50%) translateY(-1px);
+}
+
+.scroll-bottom-btn:active {
+  transform: translateX(-50%) scale(0.97);
+}
+
+.scroll-button-enter-active,
+.scroll-button-leave-active {
+  transition: opacity 0.18s ease, transform 0.18s ease;
+}
+
+.scroll-button-enter-from,
+.scroll-button-leave-to {
+  opacity: 0;
+  transform: translateX(-50%) translateY(7px);
 }
 
 .welcome {
   display: flex;
-  flex-direction: column;
   align-items: center;
   justify-content: center;
-  height: 100%;
+  min-height: 100%;
+}
+
+.welcome-panel {
+  width: min(100%, 620px);
+  padding: 24px 18px 30px;
   text-align: center;
-  color: var(--text-secondary);
+  animation: welcome-in 0.45s cubic-bezier(0.16, 1, 0.3, 1) both;
 }
 
 .welcome-icon {
-  font-size: 64px;
-  margin-bottom: 16px;
+  width: 52px;
+  height: 52px;
+  margin: 0 auto 18px;
+  border-radius: 16px;
+  background: #fff;
+  border: 1px solid var(--border-strong);
+  color: var(--accent);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: 0 10px 28px rgba(38, 59, 92, 0.08);
 }
 
 .welcome h2 {
-  font-size: 24px;
+  margin-bottom: 10px;
   color: var(--text-primary);
-  margin-bottom: 8px;
+  font-size: clamp(23px, 2.4vw, 28px);
+  font-weight: 680;
+  letter-spacing: -0.035em;
+  line-height: 1.28;
 }
 
 .welcome p {
+  max-width: 460px;
+  margin: 0 auto;
+  color: var(--text-secondary);
   font-size: 14px;
+  line-height: 1.65;
 }
 
 .loading-state {
-  text-align: center;
-  padding: 24px;
-  color: var(--text-muted);
+  width: min(100%, 680px);
+  margin: 28px auto;
+  padding: 18px 0;
+}
+
+.loading-state span {
+  display: block;
+  height: 12px;
+  margin-bottom: 10px;
+  border-radius: 6px;
+  background: #e8edf3;
+  animation: skeleton-pulse 1.2s ease-in-out infinite;
+}
+
+.loading-state span:nth-child(1) {
+  width: 68%;
+}
+
+.loading-state span:nth-child(2) {
+  width: 88%;
+}
+
+.loading-state span:nth-child(3) {
+  width: 52%;
 }
 
 .typing-indicator {
   display: flex;
   gap: 4px;
-  padding: 16px 24px;
+  max-width: var(--input-max-width);
+  margin: 0 auto;
+  padding: 12px 40px;
 }
 
 .typing-indicator span {
-  width: 8px;
-  height: 8px;
-  background: var(--text-muted);
+  width: 7px;
+  height: 7px;
+  background: #aab5c4;
   border-radius: 50%;
-  animation: bounce 1.4s infinite ease-in-out both;
+  animation: bounce 1.2s infinite ease-in-out both;
+}
+
+.typing-indicator span:nth-child(1) {
+  animation-delay: -0.24s;
+}
+
+.typing-indicator span:nth-child(2) {
+  animation-delay: -0.12s;
+}
+
+@keyframes welcome-in {
+  from { opacity: 0; transform: translateY(8px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+
+@keyframes skeleton-pulse {
+  0%, 100% { opacity: 0.55; }
+  50% { opacity: 1; }
 }
-.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
-.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }
 
 @keyframes bounce {
-  0%, 80%, 100% { transform: scale(0); }
-  40% { transform: scale(1); }
+  0%, 80%, 100% { transform: scale(0.65); opacity: 0.45; }
+  40% { transform: scale(1); opacity: 1; }
+}
+
+@media (max-width: 768px) {
+  .message-list {
+    padding: 14px 12px 10px;
+  }
+
+  .scroll-bottom-btn {
+    bottom: 8px;
+    min-height: 36px;
+    padding: 0 12px;
+  }
+
+  .welcome-panel {
+    padding: 18px 10px 24px;
+  }
+
+  .welcome-icon {
+    width: 48px;
+    height: 48px;
+    margin-bottom: 16px;
+    border-radius: 15px;
+  }
+
+  .welcome h2 {
+    max-width: 330px;
+    margin-right: auto;
+    margin-left: auto;
+    font-size: 23px;
+    line-height: 1.3;
+  }
+
+  .welcome p {
+    max-width: 310px;
+    font-size: 13px;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .scroll-bottom-btn,
+  .welcome-panel,
+  .loading-state span,
+  .typing-indicator span {
+    animation: none;
+  }
 }
 </style>
diff --git a/frontend/src/components/NotificationCenter.vue b/frontend/src/components/NotificationCenter.vue
new file mode 100644
index 0000000..b250b97
--- /dev/null
+++ b/frontend/src/components/NotificationCenter.vue
@@ -0,0 +1,292 @@
+<template>
+  <Teleport to="body">
+    <section class="notification-region" aria-label="系统通知" aria-live="assertive">
+      <TransitionGroup name="notification">
+        <article
+          v-for="item in notification.notifications"
+          :key="item.id"
+          class="notification-card"
+          :class="`notification-${item.type}`"
+          role="alert"
+        >
+          <div class="notification-icon" aria-hidden="true">
+            <IconAlertTriangle :size="20" :stroke-width="1.8" />
+          </div>
+
+          <div class="notification-content">
+            <div class="notification-heading">
+              <strong>{{ item.title }}</strong>
+              <button
+                class="notification-close"
+                type="button"
+                aria-label="关闭提示"
+                @click="notification.dismiss(item.id)"
+              >
+                <IconX :size="17" :stroke-width="1.8" />
+              </button>
+            </div>
+
+            <p>{{ item.message }}</p>
+
+            <details v-if="item.detail" class="notification-detail">
+              <summary>
+                <span>查看技术详情</span>
+                <IconChevronDown class="detail-chevron" :size="16" :stroke-width="1.8" />
+              </summary>
+              <div class="detail-body">
+                <pre>{{ item.detail }}</pre>
+                <button class="copy-detail" type="button" @click="copyDetail(item)">
+                  <IconCheck v-if="copiedId === item.id" :size="15" :stroke-width="1.8" />
+                  <IconCopy v-else :size="15" :stroke-width="1.8" />
+                  {{ copiedId === item.id ? '已复制' : '复制详情' }}
+                </button>
+              </div>
+            </details>
+          </div>
+        </article>
+      </TransitionGroup>
+    </section>
+  </Teleport>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+import IconAlertTriangle from '@tabler/icons-vue/dist/esm/icons/IconAlertTriangle.mjs'
+import IconCheck from '@tabler/icons-vue/dist/esm/icons/IconCheck.mjs'
+import IconChevronDown from '@tabler/icons-vue/dist/esm/icons/IconChevronDown.mjs'
+import IconCopy from '@tabler/icons-vue/dist/esm/icons/IconCopy.mjs'
+import IconX from '@tabler/icons-vue/dist/esm/icons/IconX.mjs'
+import { useNotificationStore } from '@/stores/notification'
+
+const notification = useNotificationStore()
+const copiedId = ref(null)
+let copiedTimer = null
+
+async function copyDetail(item) {
+  try {
+    await navigator.clipboard.writeText(item.detail)
+    copiedId.value = item.id
+    if (copiedTimer) clearTimeout(copiedTimer)
+    copiedTimer = setTimeout(() => {
+      copiedId.value = null
+    }, 1800)
+  } catch {
+    copiedId.value = null
+  }
+}
+</script>
+
+<style scoped>
+.notification-region {
+  position: fixed;
+  top: 16px;
+  right: 16px;
+  z-index: 120;
+  display: flex;
+  width: min(420px, calc(100vw - 32px));
+  flex-direction: column;
+  gap: 10px;
+  pointer-events: none;
+}
+
+.notification-card {
+  position: relative;
+  display: grid;
+  grid-template-columns: 38px minmax(0, 1fr);
+  gap: 12px;
+  overflow: hidden;
+  padding: 14px;
+  background: rgba(255, 255, 255, 0.98);
+  border: 1px solid var(--border-strong);
+  border-radius: 16px;
+  box-shadow: 0 18px 48px rgba(38, 59, 92, 0.16);
+  pointer-events: auto;
+}
+
+.notification-card::before {
+  content: '';
+  position: absolute;
+  inset: 0 auto 0 0;
+  width: 3px;
+  background: var(--danger);
+}
+
+.notification-icon {
+  width: 38px;
+  height: 38px;
+  border-radius: 12px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: #fff0f0;
+  color: var(--danger);
+}
+
+.notification-content {
+  min-width: 0;
+}
+
+.notification-heading {
+  display: flex;
+  min-height: 28px;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 10px;
+}
+
+.notification-heading strong {
+  padding-top: 2px;
+  color: var(--text-primary);
+  font-size: 15px;
+  font-weight: 650;
+  line-height: 1.4;
+}
+
+.notification-close {
+  width: 28px;
+  height: 28px;
+  margin: -3px -4px 0 0;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: var(--text-muted);
+  flex-shrink: 0;
+  transition: background 0.16s ease, color 0.16s ease, transform 0.16s ease;
+}
+
+.notification-close:hover {
+  background: var(--bg-soft);
+  color: var(--text-primary);
+}
+
+.notification-close:active,
+.copy-detail:active {
+  transform: scale(0.96);
+}
+
+.notification-content > p {
+  max-width: 36em;
+  color: var(--text-secondary);
+  font-size: 13px;
+  line-height: 1.65;
+  text-wrap: pretty;
+}
+
+.notification-detail {
+  margin-top: 10px;
+  border-top: 1px solid var(--border);
+}
+
+.notification-detail summary {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+  padding: 10px 0 1px;
+  color: var(--text-secondary);
+  font-size: 12px;
+  font-weight: 550;
+  cursor: pointer;
+  list-style: none;
+  user-select: none;
+}
+
+.notification-detail summary::-webkit-details-marker {
+  display: none;
+}
+
+.detail-chevron {
+  transition: transform 0.18s ease;
+}
+
+.notification-detail[open] .detail-chevron {
+  transform: rotate(180deg);
+}
+
+.detail-body {
+  margin-top: 8px;
+  padding: 10px;
+  background: #f6f8fb;
+  border: 1px solid var(--border);
+  border-radius: 10px;
+}
+
+.detail-body pre {
+  max-height: 190px;
+  overflow: auto;
+  color: #354258;
+  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
+  font-size: 11px;
+  line-height: 1.55;
+  white-space: pre-wrap;
+  overflow-wrap: anywhere;
+}
+
+.copy-detail {
+  display: inline-flex;
+  align-items: center;
+  gap: 5px;
+  min-height: 30px;
+  margin-top: 9px;
+  padding: 0 9px;
+  background: #fff;
+  border: 1px solid var(--border-strong);
+  border-radius: 8px;
+  color: var(--text-secondary);
+  font-size: 11px;
+  transition: background 0.16s ease, color 0.16s ease, transform 0.16s ease;
+}
+
+.copy-detail:hover {
+  background: var(--bg-soft);
+  color: var(--text-primary);
+}
+
+.notification-enter-active,
+.notification-leave-active {
+  transition: opacity 0.22s ease, transform 0.22s cubic-bezier(0.16, 1, 0.3, 1);
+}
+
+.notification-enter-from,
+.notification-leave-to {
+  opacity: 0;
+  transform: translateY(-8px) scale(0.98);
+}
+
+@media (max-width: 768px) {
+  .notification-region {
+    top: calc(10px + env(safe-area-inset-top));
+    right: 10px;
+    left: 10px;
+    width: auto;
+  }
+
+  .notification-card {
+    grid-template-columns: 34px minmax(0, 1fr);
+    gap: 10px;
+    padding: 12px;
+    border-radius: 14px;
+  }
+
+  .notification-icon {
+    width: 34px;
+    height: 34px;
+    border-radius: 10px;
+  }
+
+  .detail-body pre {
+    max-height: min(220px, 36dvh);
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .notification-enter-active,
+  .notification-leave-active,
+  .notification-close,
+  .copy-detail,
+  .detail-chevron {
+    transition: none;
+  }
+}
+</style>
diff --git a/frontend/src/router/index.js b/frontend/src/router/index.js
index a81fc10..626bc40 100644
--- a/frontend/src/router/index.js
+++ b/frontend/src/router/index.js
@@ -39,7 +39,7 @@ router.beforeEach(async (to, from, next) => {
     return
   }
 
-  if (to.meta.guest && auth.isLoggedIn) {
+  if (to.meta.guest && auth.isLoggedIn && !auth.isGuest) {
     next({ name: 'Chat' })
     return
   }
diff --git a/frontend/src/stores/auth.js b/frontend/src/stores/auth.js
index 886883b..8f3af97 100644
--- a/frontend/src/stores/auth.js
+++ b/frontend/src/stores/auth.js
@@ -1,6 +1,7 @@
 import { defineStore } from 'pinia'
 import { ref, computed } from 'vue'
 import api from '@/api'
+import { getOrCreateGuestKey } from '@/utils/guestSession'
 
 export const useAuthStore = defineStore('auth', () => {
   const token = ref(localStorage.getItem('token') || '')
@@ -8,32 +9,49 @@ export const useAuthStore = defineStore('auth', () => {
   const initialized = ref(false)
 
   const isLoggedIn = computed(() => !!token.value && !!user.value)
+  const isGuest = computed(() => !!user.value?.is_guest)
+
+  function setSession(data, type) {
+    token.value = data.token
+    user.value = data.user
+    localStorage.setItem('token', token.value)
+    localStorage.setItem('auth_type', type)
+  }
+
+  async function enterGuestMode() {
+    const res = await api.post('/auth/guest', { guest_key: getOrCreateGuestKey() })
+    setSession(res.data.data, 'guest')
+    return res.data
+  }
 
   async function init() {
-    if (token.value) {
-      try {
+    try {
+      if (token.value) {
         const res = await api.get('/auth/me')
         user.value = res.data.data
-      } catch {
-        logout()
+        localStorage.setItem('auth_type', user.value?.is_guest ? 'guest' : 'account')
       }
+
+      if (!user.value) {
+        await enterGuestMode()
+      }
+    } catch {
+      logout()
+      await enterGuestMode()
+    } finally {
+      initialized.value = true
     }
-    initialized.value = true
   }
 
   async function login(account, password) {
     const res = await api.post('/auth/login', { account, password })
-    token.value = res.data.data.token
-    user.value = res.data.data.user
-    localStorage.setItem('token', token.value)
+    setSession(res.data.data, 'account')
     return res.data
   }
 
   async function register(username, email, password) {
     const res = await api.post('/auth/register', { username, email, password })
-    token.value = res.data.data.token
-    user.value = res.data.data.user
-    localStorage.setItem('token', token.value)
+    setSession(res.data.data, 'account')
     return res.data
   }
 
@@ -41,7 +59,8 @@ export const useAuthStore = defineStore('auth', () => {
     token.value = ''
     user.value = null
     localStorage.removeItem('token')
+    localStorage.removeItem('auth_type')
   }
 
-  return { token, user, initialized, isLoggedIn, init, login, register, logout }
+  return { token, user, initialized, isLoggedIn, isGuest, init, enterGuestMode, login, register, logout }
 })
diff --git a/frontend/src/stores/chat.js b/frontend/src/stores/chat.js
index c789ada..8f85e1b 100644
--- a/frontend/src/stores/chat.js
+++ b/frontend/src/stores/chat.js
@@ -55,6 +55,7 @@ export const useChatStore = defineStore('chat', () => {
   const sidebarOpen = ref(false)
   /** 侧边栏当前选中的模型，发送/新建会话都会使用它 */
   const selectedModelId = ref(null)
+  const selectedAgentId = ref(localStorage.getItem('selected_agent_id') || null)
 
   let pendingPollTimer = null
   let pendingPollInFlight = false
@@ -183,7 +184,16 @@ export const useChatStore = defineStore('chat', () => {
     }
   }
 
-  async function sendMessage(content, attachments = []) {
+  function setSelectedAgent(agentId) {
+    selectedAgentId.value = agentId || null
+    if (selectedAgentId.value) {
+      localStorage.setItem('selected_agent_id', selectedAgentId.value)
+    } else {
+      localStorage.removeItem('selected_agent_id')
+    }
+  }
+
+  async function sendMessage(content, attachments = [], agentId = selectedAgentId.value) {
     if (!currentId.value) {
       await createConversation(selectedModelId.value)
     } else if (selectedModelId.value != null) {
@@ -207,7 +217,7 @@ export const useChatStore = defineStore('chat', () => {
     streamingAttachments.value = []
 
     try {
-      await streamChat(content, attachments)
+      await streamChat(content, attachments, agentId)
       await loadMessages()
     } catch (e) {
       // 连接断开/代理超时：任务可能已落库为 pending，先同步再决定是否抛错
@@ -225,7 +235,7 @@ export const useChatStore = defineStore('chat', () => {
     }
   }
 
-  async function streamChat(content, attachments) {
+  async function streamChat(content, attachments, agentId = null) {
     const token = localStorage.getItem('token')
     const response = await fetch('/api/chat/completions', {
       method: 'POST',
@@ -237,6 +247,7 @@ export const useChatStore = defineStore('chat', () => {
         conversation_id: currentId.value,
         content,
         attachments,
+        agent_id: agentId || null,
         stream: true
       })
     })
@@ -350,10 +361,12 @@ export const useChatStore = defineStore('chat', () => {
     streamingAttachments,
     sidebarOpen,
     selectedModelId,
+    selectedAgentId,
     fetchConversations,
     createConversation,
     selectConversation,
     setSelectedModel,
+    setSelectedAgent,
     deleteConversation,
     sendMessage,
     loadMessages,
diff --git a/frontend/src/stores/notification.js b/frontend/src/stores/notification.js
new file mode 100644
index 0000000..1adc105
--- /dev/null
+++ b/frontend/src/stores/notification.js
@@ -0,0 +1,45 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { presentError } from '@/utils/errorPresentation'
+
+let nextId = 1
+
+export const useNotificationStore = defineStore('notification', () => {
+  const notifications = ref([])
+  const timers = new Map()
+
+  function dismiss(id) {
+    const timer = timers.get(id)
+    if (timer) clearTimeout(timer)
+    timers.delete(id)
+    notifications.value = notifications.value.filter(item => item.id !== id)
+  }
+
+  function show(payload) {
+    const id = nextId++
+    const item = {
+      id,
+      type: payload.type || 'error',
+      title: payload.title || '请求失败',
+      message: payload.message || '请求未能完成，请稍后重试。',
+      detail: payload.detail || ''
+    }
+
+    notifications.value = [...notifications.value.slice(-2), item]
+
+    if (payload.duration > 0) {
+      timers.set(id, setTimeout(() => dismiss(id), payload.duration))
+    }
+    return id
+  }
+
+  function error(errorValue, options = {}) {
+    return show({
+      type: 'error',
+      ...presentError(errorValue, options),
+      duration: options.duration ?? 0
+    })
+  }
+
+  return { notifications, show, error, dismiss }
+})
diff --git a/frontend/src/stores/settings.js b/frontend/src/stores/settings.js
index d81e6aa..784c59e 100644
--- a/frontend/src/stores/settings.js
+++ b/frontend/src/stores/settings.js
@@ -18,6 +18,7 @@ export const useSettingsStore = defineStore('settings', () => {
   const siteName = ref('AI Chat')
   const allowRegister = ref(true)
   const models = ref([])
+  const agents = ref([])
   const loaded = ref(false)
 
   async function loadPublic() {
@@ -34,5 +35,10 @@ export const useSettingsStore = defineStore('settings', () => {
     models.value = res.data.data
   }
 
-  return { features, siteName, allowRegister, models, loaded, loadPublic, loadModels }
+  async function loadAgents() {
+    const res = await api.get('/agents')
+    agents.value = res.data.data || []
+  }
+
+  return { features, siteName, allowRegister, models, agents, loaded, loadPublic, loadModels, loadAgents }
 })
diff --git a/frontend/src/utils/errorPresentation.js b/frontend/src/utils/errorPresentation.js
new file mode 100644
index 0000000..798767e
--- /dev/null
+++ b/frontend/src/utils/errorPresentation.js
@@ -0,0 +1,126 @@
+function toText(value) {
+  if (typeof value === 'string') return value.trim()
+  if (value == null) return ''
+  try {
+    return JSON.stringify(value)
+  } catch {
+    return String(value)
+  }
+}
+
+function extractRawError(error) {
+  if (typeof error === 'string') return error.trim()
+  return toText(
+    error?.response?.data?.message
+    || error?.response?.data?.error
+    || error?.detail
+    || error?.message
+    || error
+  ) || '请求未能完成'
+}
+
+function parseEmbeddedJson(raw) {
+  const start = raw.search(/[\[{]/)
+  if (start < 0) return { data: null, prefix: '', formatted: '' }
+
+  const candidate = raw.slice(start).trim()
+  try {
+    const data = JSON.parse(candidate)
+    const prefix = raw.slice(0, start).trim().replace(/[：:;；]+$/, '')
+    const formattedJson = JSON.stringify(data, null, 2)
+    return {
+      data,
+      prefix,
+      formatted: prefix ? `${prefix}\n\n${formattedJson}` : formattedJson
+    }
+  } catch {
+    return { data: null, prefix: '', formatted: '' }
+  }
+}
+
+function findDeviceValidation(value) {
+  if (Array.isArray(value)) {
+    for (const item of value) {
+      const match = findDeviceValidation(item)
+      if (match) return match
+    }
+    return null
+  }
+
+  if (!value || typeof value !== 'object') return null
+
+  const info = value.extra_info
+  if (info?.input_name === 'device') {
+    const options = Array.isArray(info.input_config?.[0]) ? info.input_config[0] : []
+    return {
+      received: toText(info.received_value),
+      options: options.map(toText).filter(Boolean)
+    }
+  }
+
+  for (const child of Object.values(value)) {
+    const match = findDeviceValidation(child)
+    if (match) return match
+  }
+  return null
+}
+
+function humanizeComfyError(raw, parsed) {
+  const device = findDeviceValidation(parsed)
+  if (device?.received) {
+    const allowed = device.options.length ? `，当前可用选项为 ${device.options.join('、')}` : ''
+    return `工作流请求使用设备 ${device.received}${allowed}。请修改 ComfyUI 的 device 节点配置后重试。`
+  }
+
+  if (/value_not_in_list|Prompt outputs failed validation/i.test(raw)) {
+    return '工作流参数没有通过 ComfyUI 校验，请检查对应节点、模型和设备配置后重试。'
+  }
+
+  if (/拒绝任务|execution error|执行失败/i.test(raw)) {
+    return 'ComfyUI 拒绝了本次生成任务，请检查工作流和节点配置后重试。'
+  }
+
+  return '图片生成服务暂时无法完成任务，请检查 ComfyUI 配置后重试。'
+}
+
+function defaultTitle(raw, status) {
+  if (/ComfyUI|Prompt outputs failed|value_not_in_list/i.test(raw)) return '图片生成失败'
+  if (status === 401) return '登录状态已失效'
+  if (status === 403) return '没有操作权限'
+  if (/network|Failed to fetch|ERR_NETWORK|连接失败/i.test(raw)) return '连接失败'
+  if (/timeout|超时/i.test(raw)) return '请求超时'
+  return '请求失败'
+}
+
+function defaultMessage(raw, status, parsed) {
+  if (/ComfyUI|Prompt outputs failed|value_not_in_list/i.test(raw)) {
+    return humanizeComfyError(raw, parsed)
+  }
+  if (status === 401) return '登录信息已过期，请重新登录。'
+  if (status === 403) return '当前账户没有执行此操作的权限。'
+  if (/network|Failed to fetch|ERR_NETWORK|连接失败/i.test(raw)) {
+    return '暂时无法连接服务，请检查网络或服务状态后重试。'
+  }
+  if (/timeout|超时/i.test(raw)) return '服务响应时间过长，请稍后重试。'
+
+  const beforeJson = raw.split(/[\[{]/, 1)[0].trim().replace(/[：:;；]+$/, '')
+  if (beforeJson && beforeJson.length <= 120) return beforeJson
+  if (raw.length <= 120) return raw
+  return '服务返回了异常信息，请稍后重试或查看技术详情。'
+}
+
+export function presentError(error, options = {}) {
+  const raw = extractRawError(error)
+  const status = error?.status || error?.response?.status || null
+  const embedded = parseEmbeddedJson(raw)
+  const isTechnical = raw.length > 140
+    || !!embedded.formatted
+    || /value_not_in_list|Prompt outputs failed|stack|traceback/i.test(raw)
+
+  return {
+    title: options.title || defaultTitle(raw, status),
+    message: options.message || defaultMessage(raw, status, embedded.data),
+    detail: options.detail ?? (isTechnical ? (embedded.formatted || raw) : ''),
+    status
+  }
+}
diff --git a/frontend/src/utils/guestSession.js b/frontend/src/utils/guestSession.js
new file mode 100644
index 0000000..ca675f3
--- /dev/null
+++ b/frontend/src/utils/guestSession.js
@@ -0,0 +1,17 @@
+const GUEST_KEY_STORAGE = 'guest_key'
+
+export function getGuestKey() {
+  const key = localStorage.getItem(GUEST_KEY_STORAGE) || ''
+  return /^[a-f0-9]{64}$/.test(key) ? key : ''
+}
+
+export function getOrCreateGuestKey() {
+  const existing = getGuestKey()
+  if (existing) return existing
+
+  const bytes = new Uint8Array(32)
+  crypto.getRandomValues(bytes)
+  const key = Array.from(bytes, byte => byte.toString(16).padStart(2, '0')).join('')
+  localStorage.setItem(GUEST_KEY_STORAGE, key)
+  return key
+}
diff --git a/frontend/src/views/ChatView.vue b/frontend/src/views/ChatView.vue
index 6675361..db553ae 100644
--- a/frontend/src/views/ChatView.vue
+++ b/frontend/src/views/ChatView.vue
@@ -10,20 +10,35 @@
 
     <main class="chat-main">
       <header class="chat-header">
-        <button class="menu-btn" @click="chat.toggleSidebar">
-          <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-            <path d="M3 12h18M3 6h18M3 18h18"/>
-          </svg>
+        <button class="menu-btn" type="button" aria-label="打开会话列表" @click="chat.toggleSidebar">
+          <IconMenu2 :size="21" :stroke-width="1.8" />
         </button>
-        <h2 class="chat-title">{{ currentTitle }}</h2>
+        <div class="chat-heading">
+          <span class="chat-kicker">AI 创作空间</span>
+          <h2 class="chat-title">{{ currentTitle }}</h2>
+        </div>
         <div class="header-actions">
           <a
             v-if="auth.user?.role === 'admin'"
             :href="adminUrl"
             target="_blank"
+            rel="noopener"
             class="btn btn-ghost btn-sm admin-link"
-          >管理后台</a>
-          <button class="btn btn-ghost btn-sm" @click="handleLogout">退出</button>
+            aria-label="打开管理后台"
+          >
+            <IconSettings :size="17" :stroke-width="1.8" />
+            <span class="action-label">后台</span>
+          </a>
+          <button
+            class="btn btn-ghost btn-sm"
+            type="button"
+            :aria-label="auth.isGuest ? '登录账户' : '退出登录'"
+            @click="handleAccountAction"
+          >
+            <IconLogin v-if="auth.isGuest" :size="17" :stroke-width="1.8" />
+            <IconLogout v-else :size="17" :stroke-width="1.8" />
+            <span class="action-label">{{ auth.isGuest ? '登录' : '退出' }}</span>
+          </button>
         </div>
       </header>
 
@@ -45,14 +60,20 @@ import { computed, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 import { useAuthStore } from '@/stores/auth'
 import { useChatStore } from '@/stores/chat'
+import { useNotificationStore } from '@/stores/notification'
 import { useSettingsStore } from '@/stores/settings'
 import ChatSidebar from '@/components/ChatSidebar.vue'
 import MessageList from '@/components/MessageList.vue'
 import ChatInput from '@/components/ChatInput.vue'
+import IconLogout from '@tabler/icons-vue/dist/esm/icons/IconLogout.mjs'
+import IconLogin from '@tabler/icons-vue/dist/esm/icons/IconLogin.mjs'
+import IconMenu2 from '@tabler/icons-vue/dist/esm/icons/IconMenu2.mjs'
+import IconSettings from '@tabler/icons-vue/dist/esm/icons/IconSettings.mjs'
 
 const router = useRouter()
 const auth = useAuthStore()
 const chat = useChatStore()
+const notification = useNotificationStore()
 const settings = useSettingsStore()
 
 const currentTitle = computed(() => {
@@ -63,20 +84,29 @@ const currentTitle = computed(() => {
 const adminUrl = import.meta.env.VITE_ADMIN_URL || `${window.location.protocol}//${window.location.hostname}:5174`
 
 onMounted(async () => {
-  await settings.loadPublic()
-  await settings.loadModels()
-  await chat.fetchConversations()
+  try {
+    await settings.loadPublic()
+    await Promise.all([settings.loadModels(), settings.loadAgents()])
+    await chat.fetchConversations()
+  } catch (err) {
+    notification.error(err, { title: '页面加载失败' })
+  }
 })
 
-async function handleSend({ content, attachments }) {
+async function handleSend({ content, attachments, agentId }) {
   try {
-    await chat.sendMessage(content, attachments)
+    await chat.sendMessage(content, attachments, agentId)
   } catch (e) {
-    alert(e.message)
+    notification.error(e)
   }
 }
 
-function handleLogout() {
+function handleAccountAction() {
+  if (auth.isGuest) {
+    router.push('/login')
+    return
+  }
+
   auth.logout()
   router.push('/login')
 }
@@ -86,7 +116,9 @@ function handleLogout() {
 .chat-layout {
   display: flex;
   height: 100%;
+  min-height: 100dvh;
   overflow: hidden;
+  background: linear-gradient(180deg, #f8faff 0%, var(--bg-primary) 100%);
 }
 
 .chat-main {
@@ -94,33 +126,58 @@ function handleLogout() {
   display: flex;
   flex-direction: column;
   min-width: 0;
-  background: var(--bg-primary);
+  background: transparent;
 }
 
 .chat-header {
   display: flex;
   align-items: center;
-  gap: 12px;
+  gap: 10px;
   height: var(--header-height);
-  padding: 0 16px;
-  border-bottom: 1px solid var(--border);
+  padding: 0 22px;
+  border-bottom: 1px solid rgba(225, 231, 239, 0.92);
+  background: rgba(255, 255, 255, 0.86);
+  backdrop-filter: blur(14px);
   flex-shrink: 0;
 }
 
 .menu-btn {
   display: none;
-  padding: 8px;
-  border-radius: 8px;
+  width: 36px;
+  height: 36px;
+  align-items: center;
+  justify-content: center;
+  border-radius: 50%;
   color: var(--text-secondary);
+  transition: background 0.16s ease, color 0.16s ease, transform 0.16s ease;
 }
+
 .menu-btn:hover {
-  background: var(--bg-hover);
+  background: var(--bg-soft);
+  color: var(--text-primary);
+}
+
+.menu-btn:active {
+  transform: scale(0.96);
+}
+
+.chat-heading {
+  flex: 1;
+  min-width: 0;
+}
+
+.chat-kicker {
+  display: inline-block;
+  margin-bottom: 1px;
+  font-size: 10px;
+  letter-spacing: 0.04em;
+  color: var(--text-muted);
 }
 
 .chat-title {
-  flex: 1;
   font-size: 16px;
-  font-weight: 500;
+  font-weight: 650;
+  line-height: 1.25;
   white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
@@ -128,17 +185,47 @@ function handleLogout() {
 
 .header-actions {
   display: flex;
-  gap: 4px;
+  gap: 6px;
 }
 
 .btn-sm {
-  padding: 6px 12px;
+  min-height: 36px;
+  padding: 7px 12px;
   font-size: 13px;
 }
 
 @media (max-width: 768px) {
+  .chat-header {
+    padding: 0 10px 0 8px;
+  }
+
   .menu-btn {
     display: flex;
   }
+
+  .chat-kicker {
+    display: none;
+  }
+
+  .chat-title {
+    font-size: 17px;
+  }
+
+  .btn-sm {
+    width: 36px;
+    min-height: 36px;
+    padding: 0;
+    border-radius: 50%;
+  }
+
+  .action-label {
+    display: none;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .menu-btn {
+    transition: none;
+  }
 }
 </style>