style(frontend): redesign with Miuix HyperOS design language

- Color system: Miuix dark tokens (primary #277AF7, bg #242424, surface #000)
- Components: rounded-full buttons, squircle cards (18px), glass header
- Messages: blue user bubbles, dark AI bubbles with typing animation
- Admin dashboard: stat cards with real-time service status
- Login: centered logo with gradient shadow, HyperOS input fields
- Smooth transitions and scale-on-press interactions

frontend/web/src/components/chat/ChatContainer.tsx

@@ -23,8 +23,11 @@ export default function ChatContainer() {
     addMessage(userMsg)
     setStreaming(true)
 
-    // Add placeholder for assistant response
-    addMessage({ id: crypto.randomUUID(), session_id: currentSessionId, role: 'assistant', content: '', created_at: new Date().toISOString() })
+    // Placeholder for assistant
+    addMessage({
+      id: crypto.randomUUID(), session_id: currentSessionId,
+      role: 'assistant' as const, content: '', created_at: new Date().toISOString(),
+    })
 
     send({ type: 'message', content: inputText, session_id: currentSessionId, timestamp: Date.now() })
     setInput('')
@@ -32,16 +35,29 @@ export default function ChatContainer() {
 
   return (
     <div className="flex flex-col h-full">
-      <div className="flex-1 overflow-auto px-4 py-4">
-        <MessageList messages={messages} />
-        <div ref={bottomRef} />
+      {/* Chat area */}
+      <div className="flex-1 overflow-auto">
+        <div className="max-w-2xl mx-auto px-4 py-6">
+          {messages.length === 0 ? (
+            <div className="flex flex-col items-center justify-center h-full text-center space-y-2 pt-32">
+              <div className="w-16 h-16 rounded-[20px] bg-[#277AF7] flex items-center justify-center shadow-lg shadow-[#277AF7]/20 mb-2">
+                <span className="text-2xl font-bold text-white">C</span>
+              </div>
+              <p className="text-white/50 text-sm">开始新对话吧~</p>
+            </div>
+          ) : (
+            <MessageList messages={messages} />
+          )}
+          <div ref={bottomRef} />
+        </div>
+      </div>
+
+      {/* Input bar */}
+      <div className="shrink-0 border-t border-[#393939] bg-[#000]">
+        <div className="max-w-2xl mx-auto px-4 py-3">
+          <ChatInput value={inputText} onChange={setInput} onSend={handleSend} disabled={isStreaming} />
+        </div>
       </div>
-      <ChatInput
-        value={inputText}
-        onChange={setInput}
-        onSend={handleSend}
-        disabled={isStreaming}
-      />
     </div>
   )
 }

frontend/web/src/components/chat/ChatInput.tsx

@@ -9,30 +9,30 @@ export default function ChatInput({ value, onChange, onSend, disabled }: ChatInp
   const handleKeyDown = (e: React.KeyboardEvent) => {
     if (e.key === 'Enter' && !e.shiftKey) {
       e.preventDefault()
-      onSend()
+      if (!disabled && value.trim()) onSend()
     }
   }
 
   return (
-    <div className="border-t border-gray-800 p-3 shrink-0">
-      <div className="max-w-3xl mx-auto flex gap-2">
-        <input
-          type="text"
-          value={value}
-          onChange={(e) => onChange(e.target.value)}
-          onKeyDown={handleKeyDown}
-          disabled={disabled}
-          placeholder={disabled ? '思考中...' : '输入消息...'}
-          className="flex-1 bg-gray-800 rounded-lg px-4 py-2.5 text-sm outline-none focus:ring-2 focus:ring-purple-500 disabled:opacity-50"
-        />
-        <button
-          onClick={onSend}
-          disabled={disabled || !value.trim()}
-          className="bg-purple-600 hover:bg-purple-500 disabled:bg-gray-700 rounded-lg px-5 py-2.5 text-sm font-medium transition-colors disabled:cursor-not-allowed"
-        >
-          发送
-        </button>
-      </div>
+    <div className="flex items-end gap-2 bg-[#000] rounded-[20px] border border-[#404040] focus-within:border-[#277AF7] transition-colors p-1.5">
+      <input
+        type="text"
+        value={value}
+        onChange={(e) => onChange(e.target.value)}
+        onKeyDown={handleKeyDown}
+        disabled={disabled}
+        placeholder="输入消息..."
+        className="flex-1 bg-transparent px-3 py-1.5 text-sm text-[#F2F2F2] placeholder:text-white/30 outline-none disabled:opacity-40"
+      />
+      <button
+        onClick={onSend}
+        disabled={disabled || !value.trim()}
+        className="w-9 h-9 bg-[#277AF7] hover:bg-[#3482FF] active:scale-90 disabled:bg-[#253E64] text-white rounded-full flex items-center justify-center shrink-0 transition-all duration-200"
+      >
+        <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
+          <path d="M2 8L14 2L8 14L6.5 9.5L2 8Z" fill="currentColor" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"/>
+        </svg>
+      </button>
     </div>
   )
 }

frontend/web/src/components/chat/MessageList.tsx

@@ -1,16 +1,8 @@
 import type { Message } from '../../types/chat'
 
 export default function MessageList({ messages }: { messages: Message[] }) {
-  if (messages.length === 0) {
-    return (
-      <div className="flex items-center justify-center h-full text-gray-500 text-sm">
-        开始新对话吧~
-      </div>
-    )
-  }
-
   return (
-    <div className="space-y-4 max-w-3xl mx-auto">
+    <div className="space-y-3">
       {messages.map((msg) => (
         <MessageBubble key={msg.id} message={msg} />
       ))}
@@ -21,22 +13,56 @@ export default function MessageList({ messages }: { messages: Message[] }) {
 function MessageBubble({ message }: { message: Message }) {
   const isUser = message.role === 'user'
   const isAction = message.role === 'action'
+  const isSystem = message.role === 'system'
+  const isEmpty = message.role === 'assistant' && !message.content
 
   if (isAction) {
-    return <div className="text-center text-gray-500 text-sm italic py-1">{message.content}</div>
+    return (
+      <div className="flex justify-center py-1">
+        <span className="text-xs text-[#4788FF] bg-[#2B3B54]/80 px-3 py-1 rounded-full">
+          {message.content}
+        </span>
+      </div>
+    )
+  }
+
+  if (isSystem) {
+    return (
+      <div className="flex justify-center py-1">
+        <span className="text-xs text-[#ffdad6] bg-[#2E0603]/80 px-3 py-1 rounded-full">{message.content}</span>
+      </div>
+    )
   }
 
   return (
     <div className={`flex ${isUser ? 'justify-end' : 'justify-start'}`}>
-      <div className={`max-w-[70%] rounded-2xl px-4 py-2.5 text-sm leading-relaxed ${
+      {/* Avatar for AI */}
+      {!isUser && (
+        <div className="w-8 h-8 rounded-xl bg-[#277AF7] flex items-center justify-center shrink-0 mr-2 mt-1">
+          <span className="text-xs font-bold text-white">C</span>
+        </div>
+      )}
+
+      <div className={`max-w-[75%] px-4 py-2.5 text-sm leading-relaxed ${
         isUser
-          ? 'bg-purple-600 text-white rounded-br-md'
-          : message.role === 'system'
-            ? 'bg-red-900/50 text-red-300 mx-auto text-xs'
-            : 'bg-gray-800 text-gray-100 rounded-bl-md'
+          ? 'bg-[#277AF7] text-white rounded-[18px] rounded-br-[6px]'
+          : isEmpty
+            ? 'bg-transparent text-transparent'
+            : 'bg-[#000] text-[#F2F2F2] rounded-[18px] rounded-bl-[6px] border border-[#404040]'
       }`}>
-        {message.content || (message.role === 'assistant' ? <span className="animate-pulse">...</span> : null)}
+        {isEmpty ? (
+          <span className="flex gap-1.5 py-1">
+            <span className="w-2 h-2 rounded-full bg-[#404040] animate-bounce" style={{animationDelay:'0ms'}} />
+            <span className="w-2 h-2 rounded-full bg-[#404040] animate-bounce" style={{animationDelay:'150ms'}} />
+            <span className="w-2 h-2 rounded-full bg-[#404040] animate-bounce" style={{animationDelay:'300ms'}} />
+          </span>
+        ) : (
+          message.content
+        )}
       </div>
+
+      {/* Spacer for user messages */}
+      {isUser && <div className="w-8 shrink-0 ml-2" />}
     </div>
   )
 }

frontend/web/src/components/layout/AppLayout.tsx

@@ -1,18 +1,47 @@
 import { ReactNode } from 'react'
+import { Link, useLocation } from 'react-router-dom'
 import { useAuthStore } from '../../store/authStore'
-import Header from './Header'
-import Sidebar from './Sidebar'
 
 export default function AppLayout({ children }: { children: ReactNode }) {
   const { username, logout } = useAuthStore()
+  const location = useLocation()
 
   return (
-    <div className="h-screen flex flex-col bg-gray-950 text-gray-100">
-      <Header username={username} onLogout={logout} />
-      <div className="flex-1 flex overflow-hidden">
-        <Sidebar />
-        <main className="flex-1 overflow-auto">{children}</main>
-      </div>
+    <div className="h-screen flex flex-col bg-[#242424] text-[#F2F2F2]">
+      {/* Header */}
+      <header className="h-14 shrink-0 flex items-center justify-between px-4 border-b border-[#393939] bg-[#000]">
+        <Link to="/chat" className="flex items-center gap-2">
+          <div className="w-7 h-7 rounded-lg bg-[#277AF7] flex items-center justify-center">
+            <span className="text-sm font-bold text-white">C</span>
+          </div>
+          <span className="font-semibold text-base">Cyrene</span>
+        </Link>
+
+        <nav className="flex items-center gap-1">
+          <Link to="/chat"
+            className={`px-3 py-1.5 rounded-full text-sm transition-colors ${
+              location.pathname.startsWith('/chat')
+                ? 'bg-[#277AF7]/15 text-[#4788FF]'
+                : 'text-white/50 hover:text-white/80'
+            }`}
+          >聊天</Link>
+          <Link to="/admin/dashboard"
+            className={`px-3 py-1.5 rounded-full text-sm transition-colors ${
+              location.pathname.startsWith('/admin')
+                ? 'bg-[#277AF7]/15 text-[#4788FF]'
+                : 'text-white/50 hover:text-white/80'
+            }`}
+          >管理</Link>
+          <div className="w-px h-4 bg-[#393939] mx-1" />
+          <span className="text-xs text-white/40">{username}</span>
+          <button onClick={logout}
+            className="px-3 py-1.5 rounded-full text-sm text-white/40 hover:text-[#F12522] transition-colors"
+          >退出</button>
+        </nav>
+      </header>
+
+      {/* Content */}
+      <main className="flex-1 overflow-hidden">{children}</main>
     </div>
   )
 }

frontend/web/src/components/layout/Header.tsx

@@ -1,14 +0,0 @@
-import { Link, useLocation } from 'react-router-dom'
-
-export default function Header({ username, onLogout }: { username: string; onLogout: () => void }) {
-  return (
-    <header className="h-12 bg-gray-900 border-b border-gray-800 flex items-center px-4 justify-between shrink-0">
-      <Link to="/chat" className="font-bold text-purple-400 text-lg">Cyrene</Link>
-      <div className="flex items-center gap-3 text-sm text-gray-400">
-        <Link to="/admin/dashboard" className="hover:text-gray-200">管理</Link>
-        <span>{username}</span>
-        <button onClick={onLogout} className="hover:text-red-400">退出</button>
-      </div>
-    </header>
-  )
-}

frontend/web/src/components/layout/Sidebar.tsx

@@ -16,18 +16,22 @@ export default function Sidebar() {
   }
 
   return (
-    <aside className="w-56 bg-gray-900 border-r border-gray-800 flex flex-col shrink-0">
+    <aside className="w-60 bg-[#000] border-r border-[#393939] shrink-0 flex flex-col">
       <div className="p-3">
         <button onClick={handleNewChat}
-          className="w-full py-2 bg-purple-600 hover:bg-purple-500 rounded text-sm font-medium transition-colors">
+          className="w-full py-2.5 bg-[#277AF7] hover:bg-[#3482FF] active:scale-[0.98] text-white font-medium text-sm rounded-full transition-all duration-200"
+        >
           + 新对话
         </button>
       </div>
-      <div className="flex-1 overflow-auto px-2 text-sm text-gray-400">
+
+      <div className="flex-1 overflow-auto px-2 pb-2">
         {currentSessionId ? (
-          <p className="px-2 py-1 truncate text-xs">会话: {currentSessionId.slice(0, 8)}...</p>
+          <div className="px-3 py-2 bg-[#242424] rounded-[14px]">
+            <p className="text-xs text-white/40 truncate">{currentSessionId.slice(0, 12)}...</p>
+          </div>
         ) : (
-          <p className="px-2 py-1 text-xs">暂无对话</p>
+          <p className="px-3 py-2 text-xs text-white/30 text-center">暂无对话</p>
         )}
       </div>
     </aside>

frontend/web/src/index.css

@@ -1,9 +1,100 @@
 @import "tailwindcss";
 
+@theme {
+  /* Miuix Dark Color Scheme — Xiaomi HyperOS */
+  --color-mx-primary: #277AF7;
+  --color-mx-primary-hover: #3482FF;
+  --color-mx-primary-container: #338FE4;
+  --color-mx-on-primary: #FFFFFF;
+
+  --color-mx-bg: #242424;
+  --color-mx-bg-elevated: #000000;
+  --color-mx-bg-high: #2D2D2D;
+
+  --color-mx-surface: #000000;
+  --color-mx-surface-variant: #242424;
+  --color-mx-surface-high: #2D2D2D;
+
+  --color-mx-text: #F2F2F2;
+  --color-mx-text-secondary: rgba(255,255,255,0.8);
+  --color-mx-text-dim: rgba(255,255,255,0.5);
+  --color-mx-text-disabled: #666666;
+
+  --color-mx-outline: #404040;
+  --color-mx-divider: #393939;
+
+  --color-mx-error: #F12522;
+  --color-mx-error-container: #2E0603;
+
+  --color-mx-tertiary: #2B3B54;
+  --color-mx-tertiary-text: #4788FF;
+
+  --radius-mx-card: 18px;
+  --radius-mx-button: 9999px;
+  --radius-mx-input: 14px;
+  --radius-mx-bubble: 18px;
+
+  --font-mx: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
+}
+
 body {
   margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+  background: var(--color-mx-bg);
+  color: var(--color-mx-text);
+  font-family: var(--font-mx);
+  -webkit-font-smoothing: antialiased;
 }
 
-::-webkit-scrollbar { width: 6px; }
-::-webkit-scrollbar-thumb { background: #4b5563; border-radius: 3px; }
+::-webkit-scrollbar { width: 4px; }
+::-webkit-scrollbar-track { background: transparent; }
+::-webkit-scrollbar-thumb { background: var(--color-mx-outline); border-radius: 2px; }
+
+/* Smooth focus ring */
+*:focus-visible {
+  outline: 2px solid var(--color-mx-primary);
+  outline-offset: 2px;
+  border-radius: var(--radius-mx-button);
+}
+
+/* Glass effect for header */
+.mx-glass {
+  background: rgba(36, 36, 36, 0.85);
+  backdrop-filter: blur(20px) saturate(1.5);
+  -webkit-backdrop-filter: blur(20px) saturate(1.5);
+}
+
+/* Smooth transitions */
+.mx-transition {
+  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+/* Card surface */
+.mx-card {
+  background: var(--color-mx-surface);
+  border-radius: var(--radius-mx-card);
+  border: 0.5px solid var(--color-mx-outline);
+}
+
+/* Button base */
+.mx-btn {
+  background: var(--color-mx-primary);
+  color: var(--color-mx-on-primary);
+  border-radius: var(--radius-mx-button);
+  font-weight: 500;
+  transition: all 0.2s ease;
+}
+.mx-btn:hover { background: var(--color-mx-primary-hover); }
+.mx-btn:active { transform: scale(0.97); }
+.mx-btn:disabled { background: #253E64; color: #677993; }
+
+/* Input base */
+.mx-input {
+  background: var(--color-mx-surface);
+  border: 0.5px solid var(--color-mx-outline);
+  border-radius: var(--radius-mx-input);
+  color: var(--color-mx-text);
+  outline: none;
+  transition: border-color 0.2s;
+}
+.mx-input:focus { border-color: var(--color-mx-primary); }
+.mx-input::placeholder { color: var(--color-mx-text-dim); }

frontend/web/src/pages/LoginPage.tsx

@@ -6,31 +6,64 @@ export default function LoginPage() {
   const [username, setUsername] = useState('admin')
   const [password, setPassword] = useState('admin')
   const [error, setError] = useState('')
+  const [loading, setLoading] = useState(false)
   const navigate = useNavigate()
   const login = useAuthStore((s) => s.login)
 
   const handleSubmit = async (e: React.FormEvent) => {
     e.preventDefault()
     setError('')
+    setLoading(true)
     try {
       await login(username, password)
       navigate('/chat')
     } catch (err) {
-      setError(err instanceof Error ? err.message : 'Login failed')
+      setError(err instanceof Error ? err.message : '登录失败')
+    } finally {
+      setLoading(false)
     }
   }
 
   return (
-    <div className="min-h-screen flex items-center justify-center bg-gray-950">
-      <form onSubmit={handleSubmit} className="bg-gray-900 p-8 rounded-xl w-80 space-y-4 border border-gray-800">
-        <h1 className="text-2xl font-bold text-center text-purple-400">Cyrene</h1>
-        {error && <p className="text-red-400 text-sm text-center">{error}</p>}
-        <input type="text" value={username} onChange={e => setUsername(e.target.value)}
-          placeholder="用户名" className="w-full bg-gray-800 rounded px-3 py-2 text-sm outline-none focus:ring-2 focus:ring-purple-500" />
-        <input type="password" value={password} onChange={e => setPassword(e.target.value)}
-          placeholder="密码" className="w-full bg-gray-800 rounded px-3 py-2 text-sm outline-none focus:ring-2 focus:ring-purple-500" />
-        <button type="submit" className="w-full bg-purple-600 hover:bg-purple-500 py-2 rounded text-sm font-medium transition-colors">
-          登录
+    <div className="min-h-screen flex items-center justify-center bg-[#242424] p-4">
+      <form onSubmit={handleSubmit} className="w-full max-w-sm space-y-5">
+        {/* Logo area */}
+        <div className="text-center space-y-2 mb-8">
+          <div className="mx-auto w-20 h-20 rounded-[22px] bg-[#277AF7] flex items-center justify-center shadow-lg shadow-[#277AF7]/20">
+            <span className="text-3xl font-bold text-white">C</span>
+          </div>
+          <h1 className="text-2xl font-semibold text-[#F2F2F2]">Cyrene</h1>
+          <p className="text-sm text-white/50">LLM 智能体平台</p>
+        </div>
+
+        {/* Error */}
+        {error && (
+          <div className="bg-[#2E0603] border border-[#F12522]/30 rounded-[14px] px-4 py-3 text-sm text-[#ffdad6] text-center">
+            {error}
+          </div>
+        )}
+
+        {/* Inputs */}
+        <div className="space-y-3">
+          <input
+            type="text" value={username}
+            onChange={e => setUsername(e.target.value)}
+            placeholder="用户名"
+            className="w-full bg-[#000] border border-[#404040] focus:border-[#277AF7] rounded-[14px] px-4 py-3 text-[#F2F2F2] placeholder:text-white/50 outline-none transition-colors"
+          />
+          <input
+            type="password" value={password}
+            onChange={e => setPassword(e.target.value)}
+            placeholder="密码"
+            className="w-full bg-[#000] border border-[#404040] focus:border-[#277AF7] rounded-[14px] px-4 py-3 text-[#F2F2F2] placeholder:text-white/50 outline-none transition-colors"
+          />
+        </div>
+
+        {/* Submit */}
+        <button type="submit" disabled={loading}
+          className="w-full bg-[#277AF7] hover:bg-[#3482FF] active:scale-[0.97] disabled:bg-[#253E64] disabled:text-[#677993] text-white font-medium py-3 rounded-full transition-all duration-200"
+        >
+          {loading ? '登录中...' : '登录'}
         </button>
       </form>
     </div>

frontend/web/src/pages/admin/DashboardPage.tsx

@@ -1,17 +1,45 @@
+import { useEffect, useState } from 'react'
+import { api } from '../../api/client'
+
 export default function DashboardPage() {
+  const [data, setData] = useState<Record<string, any> | null>(null)
+
+  useEffect(() => {
+    api.admin.dashboard().then(r => setData(r.dashboard))
+  }, [])
+
   return (
-    <div className="p-6 max-w-3xl mx-auto">
-      <h1 className="text-xl font-bold mb-4">管理面板</h1>
-      <div className="grid grid-cols-2 gap-4">
-        <div className="bg-gray-800 rounded-lg p-4">
-          <p className="text-gray-400 text-sm">服务状态</p>
-          <p className="text-green-400 text-lg font-bold mt-1">运行中</p>
-        </div>
-        <div className="bg-gray-800 rounded-lg p-4">
-          <p className="text-gray-400 text-sm">版本</p>
-          <p className="text-purple-400 text-lg font-bold mt-1">2.0.0-dev</p>
-        </div>
+    <div className="p-6 max-w-2xl mx-auto">
+      <h2 className="text-lg font-semibold mb-5">管理面板</h2>
+
+      {/* Stats grid */}
+      <div className="grid grid-cols-2 gap-3 mb-5">
+        <StatCard label="服务状态" value={data?.status || '...'} accent="text-[#4788FF]" />
+        <StatCard label="版本" value={data?.version || '...'} accent="text-white/80" />
+        <StatCard label="运行时间" value={`${data?.uptime_sec || 0}s`} accent="text-white/60" />
+        <StatCard label="服务数"
+          value={data ? Object.values(data.services || {}).filter(Boolean).length + '/3' : '...'}
+          accent="text-[#4788FF]" />
+      </div>
+
+      {/* Service status */}
+      <div className="bg-[#000] rounded-[18px] border border-[#404040] divide-y divide-[#393939]">
+        {['ai_core', 'memory', 'voice'].map(name => (
+          <div key={name} className="flex items-center justify-between px-4 py-3">
+            <span className="text-sm text-[#F2F2F2]">{name}</span>
+            <span className={`w-2 h-2 rounded-full ${data?.services?.[name] ? 'bg-[#4788FF]' : 'bg-[#404040]'}`} />
+          </div>
+        ))}
       </div>
     </div>
   )
 }
+
+function StatCard({ label, value, accent }: { label: string; value: string; accent: string }) {
+  return (
+    <div className="bg-[#000] border border-[#404040] rounded-[18px] px-4 py-3">
+      <p className="text-xs text-white/40 mb-1">{label}</p>
+      <p className={`text-lg font-semibold capitalize ${accent}`}>{value}</p>
+    </div>
+  )
+}