diff --git a/web/src/App.tsx b/web/src/App.tsx
index be2c9c2..124dd52 100644
--- a/web/src/App.tsx
+++ b/web/src/App.tsx
@@ -1,5 +1,5 @@
-import { useCallback, useEffect, useMemo, useRef } from 'react'
-import { Zap, Cpu, MessageSquare, ArrowLeft, Bot, Clock } from 'lucide-react'
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
+import { Zap, Cpu, MessageSquare, ArrowLeft, Bot, Clock, Sun, Moon } from 'lucide-react'
 import { ChatContainer } from './components/Chat/ChatContainer'
 import { TopicList } from './components/Sidebar/TopicList'
 import { SessionInfo } from './components/Sidebar/SessionInfo'
@@ -59,6 +59,32 @@ function App() {
     onMessage: handleServerMessage,
   })
 
+  // ---- 主题状态 ----
+
+  const [theme, setTheme] = useState<'dark' | 'light'>(() => {
+    const saved = localStorage.getItem('picobot-theme')
+    return saved === 'light' ? 'light' : 'dark'
+  })
+
+  useEffect(() => {
+    const root = document.documentElement
+    if (theme === 'light') {
+      root.classList.add('light')
+    } else {
+      root.classList.remove('light')
+    }
+    localStorage.setItem('picobot-theme', theme)
+
+    // 切换时启用平滑过渡
+    root.classList.add('theme-transitioning')
+    const timer = setTimeout(() => {
+      root.classList.remove('theme-transitioning')
+    }, 350)
+    return () => clearTimeout(timer)
+  }, [theme])
+
+  // ---- WebSocket 初始化 ----
+
   // 连接建立后自动加载 Session
   useEffect(() => {
     if (isConnected && status === 'connected') {
@@ -261,23 +287,33 @@ function App() {
   const toolMessages = messages
 
   return (
-    <div className="flex h-screen flex-col bg-[#0a0a0f] text-white overflow-hidden">
+    <div className="flex h-screen flex-col bg-[var(--bg-primary)] text-[var(--text-primary)] overflow-hidden">
       {/* Header */}
-      <header className="flex items-center justify-between border-b border-white/8 bg-[#12121a]/80 backdrop-blur-md px-6 py-4">
+      <header className="flex items-center justify-between border-b border-[var(--border-color)] bg-[var(--bg-secondary)]/80 backdrop-blur-md px-6 py-4">
         <div className="flex items-center gap-4">
           <div className="flex items-center gap-2">
-            <Zap className="h-6 w-6 text-[#00f0ff]" />
+            <Zap className="h-6 w-6 text-[var(--accent-cyan)]" />
             <h1 className="text-xl font-bold tracking-tight">
-              <span className="text-white">Pico</span>
-              <span className="text-[#00f0ff] glow-text">Bot</span>
+              <span className="text-[var(--text-primary)]">Pico</span>
+              <span className="text-[var(--accent-cyan)] glow-text">Bot</span>
             </h1>
           </div>
-          <div className="h-4 w-px bg-white/20" />
+          <div className="h-4 w-px bg-[var(--divider-color)]" />
           <ConnectionStatus status={status} />
+          {/* 主题切换按钮 */}
+          <div className="h-4 w-px bg-[var(--divider-color)]" />
+          <button
+            onClick={() => setTheme(prev => prev === 'dark' ? 'light' : 'dark')}
+            className="flex h-8 w-8 items-center justify-center rounded-lg text-[var(--text-muted)] hover:text-[var(--accent-cyan)] hover:bg-[var(--overlay-hover)] transition-all"
+            title={theme === 'dark' ? '切换到亮色主题' : '切换到暗色主题'}
+            aria-label={theme === 'dark' ? 'Switch to light theme' : 'Switch to dark theme'}
+          >
+            {theme === 'dark' ? <Sun className="h-4 w-4" /> : <Moon className="h-4 w-4" />}
+          </button>
         </div>
-        <div className="flex items-center gap-4 text-sm text-zinc-400">
+        <div className="flex items-center gap-4 text-sm text-[var(--text-secondary)]">
           <div className="flex items-center gap-2">
-            <Cpu className="h-4 w-4 text-[#00f0ff]" />
+            <Cpu className="h-4 w-4 text-[var(--accent-cyan)]" />
             <span>AI Ready</span>
           </div>
           {session && (
@@ -294,21 +330,21 @@ function App() {
       {/* Main Content */}
       <div className="flex flex-1 overflow-hidden">
         {/* Left Sidebar */}
-        <div className={`w-72 shrink-0 border-r border-white/8 bg-[#12121a]/50 flex flex-col ${subAgentView || schedulerView ? 'opacity-50 pointer-events-none' : ''}`}>
+        <div className={`w-72 shrink-0 border-r border-[var(--border-color)] bg-[var(--bg-secondary)]/50 flex flex-col ${subAgentView || schedulerView ? 'opacity-50 pointer-events-none' : ''}`}>
           <SessionInfo
             session={session}
             connectionId={connectionId}
           />
-          <div className="border-b border-white/8" />
+          <div className="border-b border-[var(--border-color)]" />
 
           {/* Tab 栏 */}
-          <div className="flex border-b border-white/8">
+          <div className="flex border-b border-[var(--border-color)]">
             <button
               onClick={() => setSidebarTab('topics')}
               className={`flex-1 py-2.5 text-sm font-medium text-center transition-colors ${
                 sidebarTab === 'topics'
-                  ? 'text-[#00f0ff] border-b-2 border-[#00f0ff]'
-                  : 'text-zinc-500 hover:text-zinc-300'
+                  ? 'text-[var(--accent-cyan)] border-b-2 border-[var(--accent-cyan)]'
+                  : 'text-[var(--text-muted)] hover:text-[var(--text-secondary)]'
               }`}
             >
               话题
@@ -317,8 +353,8 @@ function App() {
               onClick={() => setSidebarTab('scheduler')}
               className={`flex-1 py-2.5 text-sm font-medium text-center transition-colors ${
                 sidebarTab === 'scheduler'
-                  ? 'text-[#00f0ff] border-b-2 border-[#00f0ff]'
-                  : 'text-zinc-500 hover:text-zinc-300'
+                  ? 'text-[var(--accent-cyan)] border-b-2 border-[var(--accent-cyan)]'
+                  : 'text-[var(--text-muted)] hover:text-[var(--text-secondary)]'
               }`}
             >
               定时任务
@@ -348,60 +384,60 @@ function App() {
         </div>
 
         {/* Center - Chat */}
-        <div className="flex-1 min-w-0 bg-[#0a0a0f] flex flex-col">
+        <div className="flex-1 min-w-0 bg-[var(--bg-primary)] flex flex-col">
           {/* Scheduler job view back bar */}
           {schedulerView && (
-            <div className="shrink-0 border-b border-white/8 bg-[#12121a]/80 px-4 py-2 flex items-center gap-4">
+            <div className="shrink-0 border-b border-[var(--border-color)] bg-[var(--bg-secondary)]/80 px-4 py-2 flex items-center gap-4">
               <button
                 onClick={handleExitSchedulerJobView}
-                className="flex items-center gap-1.5 text-sm text-[#00f0ff] hover:text-[#00f0ff]/80 transition-colors"
+                className="flex items-center gap-1.5 text-sm text-[var(--accent-cyan)] hover:text-[var(--accent-cyan)]/80 transition-colors"
               >
                 <ArrowLeft className="h-4 w-4" />
                 <span>返回定时任务列表</span>
               </button>
-              <div className="h-4 w-px bg-white/20" />
-              <div className="flex items-center gap-1.5 text-sm text-zinc-300">
+              <div className="h-4 w-px bg-[var(--divider-color)]" />
+              <div className="flex items-center gap-1.5 text-sm text-[var(--text-secondary)]">
                 <Clock className="h-4 w-4 text-amber-400" />
-                <span className="text-zinc-500">定时任务:</span>
-                <span className="text-white font-medium font-mono text-xs truncate max-w-[250px]">{schedulerView.description}</span>
+                <span className="text-[var(--text-muted)]">定时任务:</span>
+                <span className="text-[var(--text-primary)] font-medium font-mono text-xs truncate max-w-[250px]">{schedulerView.description}</span>
               </div>
-              <div className="h-4 w-px bg-white/20" />
+              <div className="h-4 w-px bg-[var(--divider-color)]" />
               <div className="flex items-center gap-1.5 text-sm">
-                <span className="text-zinc-500">通道:</span>
-                <span className="text-zinc-300">{schedulerView.channel}</span>
+                <span className="text-[var(--text-muted)]">通道:</span>
+                <span className="text-[var(--text-secondary)]">{schedulerView.channel}</span>
               </div>
             </div>
           )}
           {/* Sub-agent back bar */}
           {subAgentView && (
-            <div className="shrink-0 border-b border-white/8 bg-[#12121a]/80 px-4 py-2 flex items-center gap-4">
+            <div className="shrink-0 border-b border-[var(--border-color)] bg-[var(--bg-secondary)]/80 px-4 py-2 flex items-center gap-4">
               <button
                 onClick={handleExitSubAgentView}
-                className="flex items-center gap-1.5 text-sm text-[#00f0ff] hover:text-[#00f0ff]/80 transition-colors"
+                className="flex items-center gap-1.5 text-sm text-[var(--accent-cyan)] hover:text-[var(--accent-cyan)]/80 transition-colors"
               >
                 <ArrowLeft className="h-4 w-4" />
                 <span>返回主会话</span>
               </button>
-              <div className="h-4 w-px bg-white/20" />
-              <div className="flex items-center gap-1.5 text-sm text-zinc-300">
+              <div className="h-4 w-px bg-[var(--divider-color)]" />
+              <div className="flex items-center gap-1.5 text-sm text-[var(--text-secondary)]">
                 <Bot className="h-4 w-4 text-violet-400" />
-                <span className="text-zinc-500">子智能体:</span>
-                <span className="text-white font-medium">{subAgentView.description}</span>
+                <span className="text-[var(--text-muted)]">子智能体:</span>
+                <span className="text-[var(--text-primary)] font-medium">{subAgentView.description}</span>
               </div>
-              <div className="h-4 w-px bg-white/20" />
+              <div className="h-4 w-px bg-[var(--divider-color)]" />
               <div className="flex items-center gap-1.5 text-sm">
-                <span className="text-zinc-500">类型:</span>
-                <span className="text-zinc-300">{subAgentView.subagentType || '...'}</span>
+                <span className="text-[var(--text-muted)]">类型:</span>
+                <span className="text-[var(--text-secondary)]">{subAgentView.subagentType || '...'}</span>
               </div>
-              <div className="h-4 w-px bg-white/20" />
+              <div className="h-4 w-px bg-[var(--divider-color)]" />
               <div className="flex items-center gap-1.5 text-sm">
-                <span className="text-zinc-500">状态:</span>
+                <span className="text-[var(--text-muted)]">状态:</span>
                 <span className={`font-medium ${
                   subAgentView.status === 'completed' ? 'text-emerald-400' :
                   subAgentView.status === 'failed' ? 'text-red-400' :
                   subAgentView.status === 'timeout' ? 'text-amber-400' :
                   subAgentView.status === 'running' ? 'text-amber-400' :
-                  'text-zinc-400'
+                  'text-[var(--text-secondary)]'
                 }`}>
                   {subAgentView.status === 'completed' ? '已完成' :
                    subAgentView.status === 'failed' ? '失败' :
@@ -431,7 +467,7 @@ function App() {
         </div>
 
         {/* Right Sidebar - Tool Panel */}
-        <div className="w-80 shrink-0 border-l border-white/8 bg-[#12121a]/50">
+        <div className="w-80 shrink-0 border-l border-[var(--border-color)] bg-[var(--bg-secondary)]/50">
           <ToolPanel messages={toolMessages} />
         </div>
       </div>
diff --git a/web/src/components/Chat/MessageBubble.tsx b/web/src/components/Chat/MessageBubble.tsx
index 080dbe1..a620488 100644
--- a/web/src/components/Chat/MessageBubble.tsx
+++ b/web/src/components/Chat/MessageBubble.tsx
@@ -125,20 +125,20 @@ function AttachmentCard({ attachment }: { attachment: Attachment }) {
   return (
     <div
       onClick={canDownload ? handleDownload : undefined}
-      className={`flex items-center gap-2 rounded-lg bg-white/5 border border-white/10 px-3 py-2 text-xs transition-colors group ${
-        canDownload ? 'hover:bg-white/10 hover:border-[#00f0ff]/30 cursor-pointer' : ''
+      className={`flex items-center gap-2 rounded-lg bg-[var(--overlay-hover)] border border-[var(--border-color)] px-3 py-2 text-xs transition-colors group ${
+        canDownload ? 'hover:bg-[var(--overlay-subtle)] hover:border-[var(--accent-cyan)]/30 cursor-pointer' : ''
       }`}
       title={canDownload ? `下载 ${fileName}` : attachment.path}
     >
-      <span className={`text-zinc-400 transition-colors ${canDownload ? 'group-hover:text-[#00f0ff]' : ''}`}>
+      <span className={`text-[var(--text-secondary)] transition-colors ${canDownload ? 'group-hover:text-[var(--accent-cyan)]' : ''}`}>
         {getAttachmentIcon(attachment.media_type)}
       </span>
-      <span className={`text-zinc-300 truncate max-w-[200px] transition-colors ${canDownload ? 'group-hover:text-white' : ''}`} title={attachment.path}>
+      <span className={`text-[var(--text-secondary)] truncate max-w-[200px] transition-colors ${canDownload ? 'group-hover:text-[var(--text-primary)]' : ''}`} title={attachment.path}>
         {fileName}
       </span>
-      <span className="text-zinc-600 ml-auto shrink-0">{attachment.media_type}</span>
+      <span className="text-[var(--text-muted)] ml-auto shrink-0">{attachment.media_type}</span>
       {canDownload && (
-        <Download className="h-3 w-3 text-zinc-600 group-hover:text-[#00f0ff] transition-colors" />
+        <Download className="h-3 w-3 text-[var(--text-muted)] group-hover:text-[var(--accent-cyan)] transition-colors" />
       )}
     </div>
   )
@@ -162,13 +162,13 @@ function CopyButton({ text, className = '' }: { text: string; className?: string
   return (
     <button
       onClick={handleCopy}
-      className={`opacity-0 group-hover:opacity-100 transition-opacity p-0.5 rounded hover:bg-white/10 flex-shrink-0 ${className}`}
+      className={`opacity-0 group-hover:opacity-100 transition-opacity p-0.5 rounded hover:bg-[var(--overlay-subtle)] flex-shrink-0 ${className}`}
       title="复制"
     >
       {copied ? (
         <Check className="h-3 w-3 text-emerald-400" />
       ) : (
-        <Copy className="h-3 w-3 text-zinc-500" />
+        <Copy className="h-3 w-3 text-[var(--text-muted)]" />
       )}
     </button>
   )
@@ -281,7 +281,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
         </div>
         <div className="max-w-[80%] min-w-0">
           <div className="flex items-center gap-2 mb-1">
-            <span className="text-xs font-medium text-zinc-400">{message.toolName || 'Tool'}</span>
+            <span className="text-xs font-medium text-[var(--text-secondary)]">{message.toolName || 'Tool'}</span>
             {isTaskTool && (
               <span className="text-xs px-1.5 py-0.5 rounded bg-violet-500/10 text-violet-400">
                 子智能体·{subagentType}
@@ -292,11 +292,11 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                 子智能体
               </span>
             )}
-            <span className="text-xs text-zinc-600">{formatTime(message.timestamp)}</span>
+            <span className="text-xs text-[var(--text-muted)]">{formatTime(message.timestamp)}</span>
           </div>
           <div
             onClick={() => setToolExpanded(!toolExpanded)}
-            className={`cursor-pointer rounded-xl border bg-[#1a1a25]/60 w-full transition-all duration-500 hover:bg-[#1a1a25]/80 group ${
+            className={`cursor-pointer rounded-xl border bg-[var(--bg-tertiary)]/60 w-full transition-all duration-500 hover:bg-[var(--bg-tertiary)]/80 group ${
               taskResult ? taskStatusConfig[taskResult.status].borderColor : statusConfig.fullBorder
             }`}
           >
@@ -305,7 +305,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
               <span className={`inline-block h-2 w-2 rounded-full flex-shrink-0 transition-colors duration-500 ${
                 taskResult ? taskStatusConfig[taskResult.status].dot : statusConfig.dot
               }`} />
-              <span className="text-sm font-medium text-zinc-300 truncate">
+              <span className="text-sm font-medium text-[var(--text-secondary)] truncate">
                 {isTaskTool ? (taskDescription || '子智能体任务') : (message.toolName || 'Tool')}
               </span>
               <span className={`flex-shrink-0 transition-all duration-300 ${
@@ -318,16 +318,16 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                 )}
               </span>
               {status === 'result' && message.durationMs != null && (
-                <span className="text-xs text-zinc-600 flex-shrink-0 tabular-nums ml-1">
+                <span className="text-xs text-[var(--text-muted)] flex-shrink-0 tabular-nums ml-1">
                   ⏱️ {formatDuration(message.durationMs)}
                 </span>
               )}
               {hasResult && <CopyButton text={taskResult ? taskResult.output : displayContent} />}
               <span className="ml-auto flex-shrink-0">
                 {toolExpanded ? (
-                  <ChevronDown className="h-3.5 w-3.5 text-zinc-500" />
+                  <ChevronDown className="h-3.5 w-3.5 text-[var(--text-muted)]" />
                 ) : (
-                  <ChevronRight className="h-3.5 w-3.5 text-zinc-500" />
+                  <ChevronRight className="h-3.5 w-3.5 text-[var(--text-muted)]" />
                 )}
               </span>
             </div>
@@ -336,7 +336,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
             {!toolExpanded && (
               <>
                 {hasArgs && argsPreview && !taskResult && (
-                  <div className="px-3 pb-1 text-xs text-zinc-500 font-mono line-clamp-3"
+                  <div className="px-3 pb-1 text-xs text-[var(--text-muted)] font-mono line-clamp-3"
                        style={{
                          display: '-webkit-box',
                          WebkitLineClamp: 3,
@@ -347,7 +347,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                   </div>
                 )}
                 {taskResult && taskResult.summary && (
-                  <div className="px-3 pb-1 text-xs text-zinc-400 line-clamp-2">
+                  <div className="px-3 pb-1 text-xs text-[var(--text-secondary)] line-clamp-2">
                     {taskResult.summary}
                   </div>
                 )}
@@ -358,7 +358,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                         e.stopPropagation()
                         onNavigateToSubAgent?.(taskResult.task_id, taskDescription || '子智能体任务')
                       }}
-                      className="text-xs text-[#00f0ff] hover:text-[#00f0ff]/80 hover:underline transition-colors flex items-center gap-1"
+                      className="text-xs text-[var(--accent-cyan)] hover:text-[var(--accent-cyan)]/80 hover:underline transition-colors flex items-center gap-1"
                     >
                       <span>查看完整会话</span>
                       <span>→</span>
@@ -372,7 +372,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                         e.stopPropagation()
                         onNavigateToSubAgent?.(message.subagentTaskId!, taskDescription || '子智能体任务')
                       }}
-                      className="text-xs text-[#00f0ff] hover:text-[#00f0ff]/80 hover:underline transition-colors flex items-center gap-1"
+                      className="text-xs text-[var(--accent-cyan)] hover:text-[var(--accent-cyan)]/80 hover:underline transition-colors flex items-center gap-1"
                     >
                       <span>查看实时进度</span>
                       <span>→</span>
@@ -380,7 +380,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                   </div>
                 )}
                 {isTaskTool && !taskResult && !message.subagentTaskId && (
-                  <div className="px-3 pb-2 text-xs text-zinc-500">
+                  <div className="px-3 pb-2 text-xs text-[var(--text-muted)]">
                     子智能体正在执行...
                   </div>
                 )}
@@ -389,13 +389,13 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
 
             {/* Expanded */}
             {toolExpanded && (
-              <div className="border-t border-white/8 px-3 py-2 space-y-2">
+              <div className="border-t border-[var(--border-color)] px-3 py-2 space-y-2">
                 {taskResult ? (
                   <>
                     {taskPrompt && (
                       <div>
-                        <div className="text-xs font-medium text-zinc-500 mb-1">任务指令</div>
-                        <pre className="text-xs text-zinc-400 font-mono whitespace-pre-wrap bg-black/20 rounded-lg p-2 overflow-x-auto max-h-32 overflow-y-auto">
+                        <div className="text-xs font-medium text-[var(--text-muted)] mb-1">任务指令</div>
+                        <pre className="text-xs text-[var(--text-secondary)] font-mono whitespace-pre-wrap bg-[var(--overlay-dim)] rounded-lg p-2 overflow-x-auto max-h-32 overflow-y-auto">
                           {taskPrompt}
                         </pre>
                       </div>
@@ -406,19 +406,19 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                         taskResult.status === 'failed' ? 'bg-red-500/10 border border-red-500/30' :
                         'bg-amber-500/10 border border-amber-500/30'
                       }`}>
-                        <div className="text-xs font-medium text-zinc-500 mb-0.5">摘要</div>
-                        <div className="text-sm text-zinc-300">{taskResult.summary}</div>
+                        <div className="text-xs font-medium text-[var(--text-muted)] mb-0.5">摘要</div>
+                        <div className="text-sm text-[var(--text-secondary)]">{taskResult.summary}</div>
                       </div>
                     )}
                     <div>
-                      <div className="text-xs font-medium text-zinc-500 mb-1">输出</div>
-                      <div className="markdown-content text-sm leading-relaxed bg-black/20 rounded-lg p-3 max-h-96 overflow-y-auto">
+                      <div className="text-xs font-medium text-[var(--text-muted)] mb-1">输出</div>
+                      <div className="markdown-content text-sm leading-relaxed bg-[var(--overlay-dim)] rounded-lg p-3 max-h-96 overflow-y-auto">
                         <ReactMarkdown remarkPlugins={[remarkGfm]}>
                           {taskResult.output}
                         </ReactMarkdown>
                       </div>
                     </div>
-                    <div className="text-xs text-zinc-600 font-mono select-all">
+                    <div className="text-xs text-[var(--text-muted)] font-mono select-all">
                       task_id: {taskResult.task_id}
                     </div>
                     <button
@@ -426,7 +426,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                         e.stopPropagation()
                         onNavigateToSubAgent?.(taskResult.task_id, taskDescription || '子智能体任务')
                       }}
-                      className="text-xs text-[#00f0ff] hover:text-[#00f0ff]/80 hover:underline transition-colors flex items-center gap-1"
+                      className="text-xs text-[var(--accent-cyan)] hover:text-[var(--accent-cyan)]/80 hover:underline transition-colors flex items-center gap-1"
                     >
                       <span>查看完整会话</span>
                       <span>→</span>
@@ -436,16 +436,16 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                   <>
                     {hasArgs && (
                       <div>
-                        <div className="text-xs font-medium text-zinc-500 mb-1">参数</div>
-                        <pre className="text-xs text-zinc-400 font-mono whitespace-pre-wrap bg-black/20 rounded-lg p-2 overflow-x-auto">
+                        <div className="text-xs font-medium text-[var(--text-muted)] mb-1">参数</div>
+                        <pre className="text-xs text-[var(--text-secondary)] font-mono whitespace-pre-wrap bg-[var(--overlay-dim)] rounded-lg p-2 overflow-x-auto">
                           {JSON.stringify(message.arguments, null, 2)}
                         </pre>
                       </div>
                     )}
                     {hasResult && (
                       <div>
-                        <div className="text-xs font-medium text-zinc-500 mb-1">结果</div>
-                        <pre className="text-xs text-zinc-400 font-mono whitespace-pre-wrap bg-black/20 rounded-lg p-2 overflow-x-auto max-h-48 overflow-y-auto">
+                        <div className="text-xs font-medium text-[var(--text-muted)] mb-1">结果</div>
+                        <pre className="text-xs text-[var(--text-secondary)] font-mono whitespace-pre-wrap bg-[var(--overlay-dim)] rounded-lg p-2 overflow-x-auto max-h-48 overflow-y-auto">
                           {formatJSON(displayContent)}
                         </pre>
                       </div>
@@ -456,7 +456,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                           e.stopPropagation()
                           onNavigateToSubAgent?.(message.subagentTaskId!, taskDescription || '子智能体任务')
                         }}
-                        className="text-xs text-[#00f0ff] hover:text-[#00f0ff]/80 hover:underline transition-colors flex items-center gap-1"
+                        className="text-xs text-[var(--accent-cyan)] hover:text-[var(--accent-cyan)]/80 hover:underline transition-colors flex items-center gap-1"
                       >
                         <span>查看实时进度</span>
                         <span>→</span>
@@ -485,26 +485,26 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
 
   const getContainerStyles = () => {
     if (isUser) {
-      return 'bg-gradient-to-br from-[#00f0ff]/20 to-[#3b82f6]/20 border-[#00f0ff]/30 text-white'
+      return 'bg-gradient-to-br from-[var(--accent-cyan)]/20 to-[var(--accent-blue)]/20 border-[var(--accent-cyan)]/30 text-[var(--text-primary)]'
     }
     if (isTool) {
       if (message.type === 'tool_call') return 'bg-amber-500/10 border-amber-500/30 text-amber-100'
       if (message.type === 'tool_result') return 'bg-emerald-500/10 border-emerald-500/30 text-emerald-100'
       if (message.type === 'tool_pending') return 'bg-orange-500/10 border-orange-500/30 text-orange-100'
-      return 'bg-zinc-800/50 border-zinc-700 text-zinc-300'
+      return 'bg-[var(--bg-hover)] border-[var(--border-color)] text-[var(--text-secondary)]'
     }
-    return 'bg-[#1a1a25] border-white/10 text-white'
+    return 'bg-[var(--bg-tertiary)] border-[var(--border-color)] text-[var(--text-primary)]'
   }
 
   const getAvatarStyles = () => {
-    if (isUser) return 'bg-gradient-to-br from-[#00f0ff] to-[#3b82f6]'
+    if (isUser) return 'bg-gradient-to-br from-[var(--accent-cyan)] to-[var(--accent-blue)]'
     if (isTool) {
       if (message.type === 'tool_call') return 'bg-amber-500'
       if (message.type === 'tool_result') return 'bg-emerald-500'
       if (message.type === 'tool_pending') return 'bg-orange-500'
       return 'bg-zinc-700'
     }
-    return 'bg-gradient-to-br from-[#8b5cf6] to-[#ec4899]'
+    return 'bg-gradient-to-br from-[var(--accent-purple)] to-[#ec4899]'
   }
 
   return (
@@ -516,10 +516,10 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
       </div>
       <div className={`max-w-[80%] ${isUser ? 'text-right' : 'text-left'}`}>
         <div className="flex items-center gap-2 mb-1">
-          <span className={`text-xs font-medium ${isUser ? 'text-[#00f0ff]' : 'text-zinc-400'}`}>
+          <span className={`text-xs font-medium ${isUser ? 'text-[var(--accent-cyan)]' : 'text-[var(--text-secondary)]'}`}>
             {isUser ? 'You' : isTool ? message.toolName || 'Tool' : 'Assistant'}
           </span>
-          <span className="text-xs text-zinc-600">{formatTime(message.timestamp)}</span>
+          <span className="text-xs text-[var(--text-muted)]">{formatTime(message.timestamp)}</span>
           <CopyButton text={message.content} />
         </div>
         <div
@@ -546,7 +546,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                     if (isInline) {
                       return (
                         <code
-                          className="bg-black/30 px-1.5 py-0.5 rounded text-[#00f0ff] font-mono text-xs"
+                          className="bg-[var(--overlay-code)] px-1.5 py-0.5 rounded text-[var(--accent-cyan)] font-mono text-xs"
                           {...props}
                         >
                           {children}
@@ -554,7 +554,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                       )
                     }
                     return (
-                      <pre className="bg-black/40 rounded-lg p-3 overflow-x-auto my-2">
+                      <pre className="bg-[var(--overlay-dim-heavy)] rounded-lg p-3 overflow-x-auto my-2">
                         <code className={`${className} font-mono text-xs`} {...props}>
                           {children}
                         </code>
@@ -563,13 +563,13 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                   },
                   // 标题样式
                   h1: ({ children }) => (
-                    <h1 className="text-xl font-bold text-white mb-2 mt-4">{children}</h1>
+                    <h1 className="text-xl font-bold text-[var(--text-primary)] mb-2 mt-4">{children}</h1>
                   ),
                   h2: ({ children }) => (
-                    <h2 className="text-lg font-bold text-white mb-2 mt-3">{children}</h2>
+                    <h2 className="text-lg font-bold text-[var(--text-primary)] mb-2 mt-3">{children}</h2>
                   ),
                   h3: ({ children }) => (
-                    <h3 className="text-base font-bold text-white mb-1 mt-2">{children}</h3>
+                    <h3 className="text-base font-bold text-[var(--text-primary)] mb-1 mt-2">{children}</h3>
                   ),
                   // 段落
                   p: ({ children }) => <p className="mb-2 last:mb-0">{children}</p>,
@@ -582,7 +582,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                       href={href}
                       target="_blank"
                       rel="noopener noreferrer"
-                      className="text-[#00f0ff] hover:underline"
+                      className="text-[var(--accent-cyan)] hover:underline"
                     >
                       {children}
                     </a>
@@ -591,24 +591,24 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
                   table: ({ children }) => (
                     <table className="w-full border-collapse mb-2 text-xs">{children}</table>
                   ),
-                  thead: ({ children }) => <thead className="bg-white/10">{children}</thead>,
+                  thead: ({ children }) => <thead className="bg-[var(--overlay-subtle)]">{children}</thead>,
                   th: ({ children }) => (
-                    <th className="border border-white/10 px-2 py-1 text-left font-semibold">{children}</th>
+                    <th className="border border-[var(--border-color)] px-2 py-1 text-left font-semibold">{children}</th>
                   ),
                   td: ({ children }) => (
-                    <td className="border border-white/10 px-2 py-1">{children}</td>
+                    <td className="border border-[var(--border-color)] px-2 py-1">{children}</td>
                   ),
                   // 引用块
                   blockquote: ({ children }) => (
-                    <blockquote className="border-l-2 border-[#00f0ff]/50 pl-3 my-2 text-zinc-400">
+                    <blockquote className="border-l-2 border-[var(--accent-cyan)]/50 pl-3 my-2 text-[var(--text-secondary)]">
                       {children}
                     </blockquote>
                   ),
                   // 分隔线
-                  hr: () => <hr className="border-white/10 my-3" />,
+                  hr: () => <hr className="border-[var(--border-color)] my-3" />,
                   // 加粗和斜体
-                  strong: ({ children }) => <strong className="font-bold text-white">{children}</strong>,
-                  em: ({ children }) => <em className="italic text-zinc-300">{children}</em>,
+                  strong: ({ children }) => <strong className="font-bold text-[var(--text-primary)]">{children}</strong>,
+                  em: ({ children }) => <em className="italic text-[var(--text-secondary)]">{children}</em>,
                 }}
               >
                 {message.content}
diff --git a/web/src/components/Chat/MessageInput.tsx b/web/src/components/Chat/MessageInput.tsx
index 36aa92c..ce8506f 100644
--- a/web/src/components/Chat/MessageInput.tsx
+++ b/web/src/components/Chat/MessageInput.tsx
@@ -251,22 +251,22 @@ export function MessageInput({
   // 只读模式：显示提示占位符
   if (isReadOnly) {
     return (
-      <div className="border-t border-white/8 bg-[#12121a]/80 backdrop-blur-md p-4">
+      <div className="border-t border-[var(--border-color)] bg-[var(--bg-secondary)]/80 backdrop-blur-md p-4">
         <div className="max-w-5xl mx-auto">
-          <div className="rounded-xl border border-zinc-500/20 bg-[#1a1a25]/50 px-4 py-5 text-center">
+          <div className="rounded-xl border border-[var(--border-color)] bg-[var(--bg-tertiary)]/50 px-4 py-5 text-center">
             <div className="flex flex-col items-center gap-2">
-              <div className="flex items-center gap-2 text-zinc-400">
+              <div className="flex items-center gap-2 text-[var(--text-secondary)]">
                 <Eye className="h-5 w-5" />
                 <span className="font-medium">只读模式</span>
               </div>
-              <p className="text-sm text-zinc-500">
+              <p className="text-sm text-[var(--text-muted)]">
                 {channelName ? (
                   <>{channelName} 通道仅支持查看历史消息</>
                 ) : (
                   '当前通道仅支持查看历史消息'
                 )}
               </p>
-              <p className="text-xs text-zinc-600">
+              <p className="text-xs text-[var(--text-muted)]">
                 请切换至 WebSocket 通道进行输入
               </p>
             </div>
@@ -277,7 +277,7 @@ export function MessageInput({
   }
 
   return (
-    <div className="border-t border-white/8 bg-[#12121a]/80 backdrop-blur-md p-4">
+    <div className="border-t border-[var(--border-color)] bg-[var(--bg-secondary)]/80 backdrop-blur-md p-4">
       <div className="max-w-5xl mx-auto">
         {/* 错误提示 */}
         {error && (
@@ -292,7 +292,7 @@ export function MessageInput({
             {attachments.map((att, index) => (
               <div
                 key={index}
-                className="flex items-center gap-2 rounded-lg border border-white/10 bg-[#1a1a25] px-2 py-1.5 text-sm"
+                className="flex items-center gap-2 rounded-lg border border-[var(--border-color)] bg-[var(--bg-tertiary)] px-2 py-1.5 text-sm"
               >
                 {att.preview ? (
                   <img
@@ -301,16 +301,16 @@ export function MessageInput({
                     className="h-8 w-8 rounded object-cover"
                   />
                 ) : (
-                  <div className="h-8 w-8 rounded bg-zinc-700/50 flex items-center justify-center text-zinc-400">
+                  <div className="h-8 w-8 rounded bg-[var(--bg-hover)] flex items-center justify-center text-[var(--text-secondary)]">
                     {getAttachmentIcon(att.attachment.media_type)}
                   </div>
                 )}
-                <span className="text-zinc-300 max-w-[120px] truncate">
+                <span className="text-[var(--text-secondary)] max-w-[120px] truncate">
                   {att.attachment.file_name}
                 </span>
                 <button
                   onClick={() => handleRemoveAttachment(index)}
-                  className="text-zinc-500 hover:text-red-400 transition-colors"
+                  className="text-[var(--text-muted)] hover:text-red-400 transition-colors"
                 >
                   <X className="h-4 w-4" />
                 </button>
@@ -321,7 +321,7 @@ export function MessageInput({
 
         {/* 输入区域 */}
         <div
-          className={`flex gap-3 items-center relative ${isDragging ? 'ring-2 ring-[#00f0ff]/50 rounded-xl' : ''}`}
+          className={`flex gap-3 items-center relative ${isDragging ? 'ring-2 ring-[var(--accent-cyan)]/50 rounded-xl' : ''}`}
           onDragEnter={handleDragEnter}
           onDragLeave={handleDragLeave}
           onDragOver={handleDragOver}
@@ -329,8 +329,8 @@ export function MessageInput({
         >
           {/* 拖拽提示 */}
           {isDragging && (
-            <div className="absolute inset-0 rounded-xl bg-[#00f0ff]/10 border-2 border-[#00f0ff]/50 flex items-center justify-center z-10">
-              <div className="text-[#00f0ff] text-sm font-medium">
+            <div className="absolute inset-0 rounded-xl bg-[var(--accent-cyan)]/10 border-2 border-[var(--accent-cyan)]/50 flex items-center justify-center z-10">
+              <div className="text-[var(--accent-cyan)] text-sm font-medium">
                 拖放文件到这里
               </div>
             </div>
@@ -340,7 +340,7 @@ export function MessageInput({
           <button
             onClick={handleAttachClick}
             disabled={disabled}
-            className="flex h-10 w-10 shrink-0 items-center justify-center rounded-xl border border-white/10 bg-[#1a1a25] text-zinc-400 hover:text-white hover:border-white/20 disabled:opacity-50 transition-all"
+            className="flex h-10 w-10 shrink-0 items-center justify-center rounded-xl border border-[var(--border-color)] bg-[var(--bg-tertiary)] text-[var(--text-secondary)] hover:text-[var(--text-primary)] hover:border-[var(--border-color)] disabled:opacity-50 transition-all"
           >
             <Paperclip className="h-5 w-5" />
           </button>
@@ -363,9 +363,9 @@ export function MessageInput({
               placeholder={placeholder}
               disabled={disabled}
               rows={1}
-              className="w-full resize-none rounded-xl border border-white/10 bg-[#1a1a25] px-4 py-3 pr-12 text-sm text-white placeholder:text-zinc-500 focus:border-[#00f0ff]/50 focus:outline-none focus:ring-1 focus:ring-[#00f0ff]/20 disabled:opacity-50 transition-all self-center scrollbar-hide"
+              className="w-full resize-none rounded-xl border border-[var(--border-color)] bg-[var(--bg-tertiary)] px-4 py-3 pr-12 text-sm text-[var(--text-primary)] placeholder:text-[var(--text-muted)] focus:border-[var(--accent-cyan)]/50 focus:outline-none focus:ring-1 focus:ring-[var(--focus-ring)] disabled:opacity-50 transition-all self-center scrollbar-hide"
             />
-            <Sparkles className="absolute right-3 top-1/2 -translate-y-1/2 h-4 w-4 text-zinc-600 pointer-events-none" />
+            <Sparkles className="absolute right-3 top-1/2 -translate-y-1/2 h-4 w-4 text-[var(--text-muted)] pointer-events-none" />
           </div>
 
           {/* 发送/停止按钮 */}
@@ -381,7 +381,7 @@ export function MessageInput({
             <button
               onClick={handleSend}
               disabled={disabled || (!content.trim() && attachments.length === 0)}
-              className="flex h-10 w-10 shrink-0 items-center justify-center rounded-xl bg-gradient-to-r from-[#00f0ff] to-[#3b82f6] text-white shadow-lg shadow-[#00f0ff]/20 hover:shadow-xl hover:shadow-[#00f0ff]/30 hover:scale-105 disabled:opacity-50 disabled:hover:scale-100 disabled:cursor-not-allowed transition-all"
+              className="flex h-10 w-10 shrink-0 items-center justify-center rounded-xl bg-gradient-to-r from-[var(--accent-cyan)] to-[var(--accent-blue)] text-white shadow-lg shadow-[var(--accent-cyan)]/20 hover:shadow-xl hover:shadow-[var(--accent-cyan)]/30 hover:scale-105 disabled:opacity-50 disabled:hover:scale-100 disabled:cursor-not-allowed transition-all"
             >
               {disabled ? (
                 <Loader2 className="h-4 w-4 animate-spin" />
@@ -393,10 +393,10 @@ export function MessageInput({
         </div>
 
         {/* 提示 */}
-        <div className="mt-2 text-center text-xs text-zinc-500">
+        <div className="mt-2 text-center text-xs text-[var(--text-muted)]">
           按 Enter 发送，Shift+Enter 换行 · 支持拖拽/粘贴文件 · 最大 50MB
         </div>
       </div>
     </div>
   )
-}
\ No newline at end of file
+}
diff --git a/web/src/components/Chat/MessageList.tsx b/web/src/components/Chat/MessageList.tsx
index 2538b99..3f5ddb4 100644
--- a/web/src/components/Chat/MessageList.tsx
+++ b/web/src/components/Chat/MessageList.tsx
@@ -131,14 +131,14 @@ export function MessageList({ messages, onNavigateToSubAgent }: MessageListProps
     return (
       <div className="flex h-full items-center justify-center">
         <div className="text-center animate-fade-in">
-          <div className="mb-6 inline-flex h-20 w-20 items-center justify-center rounded-full bg-gradient-to-br from-[#00f0ff]/20 to-[#3b82f6]/20 shadow-2xl shadow-[#00f0ff]/20">
-            <Sparkles className="h-10 w-10 text-[#00f0ff]" />
+          <div className="mb-6 inline-flex h-20 w-20 items-center justify-center rounded-full bg-gradient-to-br from-[var(--accent-cyan)]/20 to-[var(--accent-blue)]/20 shadow-2xl shadow-[var(--accent-cyan)]/20">
+            <Sparkles className="h-10 w-10 text-[var(--accent-cyan)]" />
           </div>
-          <h2 className="mb-2 text-2xl font-bold text-white">开始新的对话</h2>
-          <p className="text-zinc-500">在下方输入消息开始与 AI 助手聊天</p>
-          <div className="mt-8 flex items-center justify-center gap-4 text-sm text-zinc-600">
-            <span className="px-3 py-1 rounded-full bg-zinc-800/50 border border-zinc-700">/new 创建话题</span>
-            <span className="px-3 py-1 rounded-full bg-zinc-800/50 border border-zinc-700">/list 查看列表</span>
+          <h2 className="mb-2 text-2xl font-bold text-[var(--text-primary)]">开始新的对话</h2>
+          <p className="text-[var(--text-muted)]">在下方输入消息开始与 AI 助手聊天</p>
+          <div className="mt-8 flex items-center justify-center gap-4 text-sm text-[var(--text-muted)]">
+            <span className="px-3 py-1 rounded-full bg-[var(--bg-hover)] border border-[var(--border-color)]">/new 创建话题</span>
+            <span className="px-3 py-1 rounded-full bg-[var(--bg-hover)] border border-[var(--border-color)]">/list 查看列表</span>
           </div>
         </div>
       </div>
@@ -168,11 +168,11 @@ export function MessageList({ messages, onNavigateToSubAgent }: MessageListProps
             onClick={scrollToTop}
             className="pointer-events-auto group relative flex items-center justify-center
                        w-9 h-9 rounded-full
-                       bg-[#1a1a25]/80 backdrop-blur-md
-                       border border-white/[0.06]
-                       text-zinc-500 hover:text-[#00f0ff]
-                       hover:border-[#00f0ff]/30
-                       hover:shadow-[0_0_20px_rgba(0,240,255,0.12)]
+                       bg-[var(--bg-tertiary)]/80 backdrop-blur-md
+                       border border-[var(--border-color)]
+                       text-[var(--text-muted)] hover:text-[var(--accent-cyan)]
+                       hover:border-[var(--accent-cyan)]/30
+                       hover:shadow-[0_0_20px_var(--shadow-glow-sm)]
                        transition-all duration-300 ease-out
                        animate-fade-in"
             aria-label="回到顶部"
@@ -187,11 +187,11 @@ export function MessageList({ messages, onNavigateToSubAgent }: MessageListProps
             onClick={() => scrollToBottom('smooth')}
             className="pointer-events-auto group relative flex items-center justify-center
                        w-9 h-9 rounded-full
-                       bg-[#1a1a25]/80 backdrop-blur-md
-                       border border-white/[0.06]
-                       text-zinc-500 hover:text-[#00f0ff]
-                       hover:border-[#00f0ff]/30
-                       hover:shadow-[0_0_20px_rgba(0,240,255,0.12)]
+                       bg-[var(--bg-tertiary)]/80 backdrop-blur-md
+                       border border-[var(--border-color)]
+                       text-[var(--text-muted)] hover:text-[var(--accent-cyan)]
+                       hover:border-[var(--accent-cyan)]/30
+                       hover:shadow-[0_0_20px_var(--shadow-glow-sm)]
                        transition-all duration-300 ease-out
                        animate-fade-in"
             aria-label="回到底部"
@@ -201,8 +201,8 @@ export function MessageList({ messages, onNavigateToSubAgent }: MessageListProps
             {/* 未读消息指示点 */}
             {hasNewMessage && (
               <span className="absolute -top-0.5 -right-0.5 flex h-2.5 w-2.5">
-                <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-[#00f0ff]/60"></span>
-                <span className="relative inline-flex h-2.5 w-2.5 rounded-full bg-[#00f0ff]"></span>
+                <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-[var(--accent-cyan)]/60"></span>
+                <span className="relative inline-flex h-2.5 w-2.5 rounded-full bg-[var(--accent-cyan)]"></span>
               </span>
             )}
           </button>
diff --git a/web/src/components/Panel/ToolPanel.tsx b/web/src/components/Panel/ToolPanel.tsx
index 38a7559..347bddc 100644
--- a/web/src/components/Panel/ToolPanel.tsx
+++ b/web/src/components/Panel/ToolPanel.tsx
@@ -128,11 +128,11 @@ export function ToolPanel({ messages }: ToolPanelProps) {
     return (
       <div className="flex h-full flex-col">
         <style>{animStyles}</style>
-        <div className="border-b border-white/8 p-4 font-semibold text-white flex items-center gap-2">
-          <Terminal className="h-4 w-4 text-[#00f0ff]" />
+        <div className="border-b border-[var(--border-color)] p-4 font-semibold text-[var(--text-primary)] flex items-center gap-2">
+          <Terminal className="h-4 w-4 text-[var(--accent-cyan)]" />
           工具调用
         </div>
-        <div className="flex flex-1 items-center justify-center p-4 text-sm text-zinc-500">
+        <div className="flex flex-1 items-center justify-center p-4 text-sm text-[var(--text-muted)]">
           <div className="text-center">
             <Terminal className="h-10 w-10 mx-auto mb-3 opacity-30" />
             暂无工具调用
@@ -145,10 +145,10 @@ export function ToolPanel({ messages }: ToolPanelProps) {
   return (
     <div className="flex h-full flex-col">
       <style>{animStyles}</style>
-      <div className="border-b border-white/8 p-4 font-semibold text-white flex items-center gap-2">
-        <Terminal className="h-4 w-4 text-[#00f0ff]" />
+      <div className="border-b border-[var(--border-color)] p-4 font-semibold text-[var(--text-primary)] flex items-center gap-2">
+        <Terminal className="h-4 w-4 text-[var(--accent-cyan)]" />
         工具调用
-        <span className="ml-auto text-xs px-2 py-0.5 rounded-full bg-[#00f0ff]/10 text-[#00f0ff]">
+        <span className="ml-auto text-xs px-2 py-0.5 rounded-full bg-[var(--accent-cyan)]/10 text-[var(--accent-cyan)]">
           {toolCalls.length}
         </span>
       </div>
@@ -167,31 +167,31 @@ export function ToolPanel({ messages }: ToolPanelProps) {
             return (
               <div
                 key={tool.toolCallId}
-                className={`rounded-xl border bg-[#1a1a25]/50 text-sm overflow-hidden tool-card transition-colors duration-500 ${config.borderClass}`}
+                className={`rounded-xl border bg-[var(--bg-tertiary)]/50 text-sm overflow-hidden tool-card transition-colors duration-500 ${config.borderClass}`}
               >
                 <button
                   onClick={() => toggleExpand(tool.toolCallId)}
-                  className="flex w-full items-center justify-between px-3 py-2.5 hover:bg-white/5 transition-colors"
+                  className="flex w-full items-center justify-between px-3 py-2.5 hover:bg-[var(--overlay-hover)] transition-colors"
                 >
                   <div className="flex items-center gap-2 min-w-0">
                     <span className={`tool-status-icon ${tool.status === 'calling' && !hasResult ? 'animate-pulse' : ''}`}>
                       <StatusIcon className={`h-3.5 w-3.5 transition-colors duration-500 ${config.iconColor}`} />
                     </span>
-                    <span className="font-medium text-zinc-300 truncate">{tool.toolName}</span>
+                    <span className="font-medium text-[var(--text-secondary)] truncate">{tool.toolName}</span>
                     <span className={`text-xs flex-shrink-0 transition-colors duration-500 ${config.labelClass}`}>
                       {config.label}
                     </span>
                     {tool.status === 'result' && tool.durationMs != null && (
-                      <span className="text-xs text-zinc-600 flex-shrink-0 tabular-nums ml-1">
+                      <span className="text-xs text-[var(--text-muted)] flex-shrink-0 tabular-nums ml-1">
                         ⏱️ {formatDuration(tool.durationMs)}
                       </span>
                     )}
                   </div>
                   <span className="flex-shrink-0 ml-2">
                     {isExpanded ? (
-                      <ChevronDown className="h-4 w-4 text-zinc-500" />
+                      <ChevronDown className="h-4 w-4 text-[var(--text-muted)]" />
                     ) : (
-                      <ChevronRight className="h-4 w-4 text-zinc-500" />
+                      <ChevronRight className="h-4 w-4 text-[var(--text-muted)]" />
                     )}
                   </span>
                 </button>
@@ -200,7 +200,7 @@ export function ToolPanel({ messages }: ToolPanelProps) {
                 {hasResult && (
                   <div className="px-3 pb-2">
                     <div
-                      className={`rounded-lg bg-black/30 px-2.5 py-2 text-xs text-zinc-400 font-mono cursor-pointer hover:bg-black/40 transition-colors ${
+                      className={`rounded-lg bg-[var(--overlay-dim-strong)] px-2.5 py-2 text-xs text-[var(--text-secondary)] font-mono cursor-pointer hover:bg-[var(--overlay-dim-heavy)] transition-colors ${
                         isExpanded ? '' : 'line-clamp-2'
                       }`}
                       onClick={() => toggleExpand(tool.toolCallId)}
@@ -212,7 +212,7 @@ export function ToolPanel({ messages }: ToolPanelProps) {
                       )}
                     </div>
                     {!isExpanded && hasMore && (
-                      <div className="text-xs text-zinc-500 mt-1 px-1">
+                      <div className="text-xs text-[var(--text-muted)] mt-1 px-1">
                         点击展开全部 ({displayContent.split('\n').length} 行)
                       </div>
                     )}
@@ -221,9 +221,9 @@ export function ToolPanel({ messages }: ToolPanelProps) {
 
                 {/* 展开区域：参数 */}
                 {isExpanded && tool.arguments ? (
-                  <div className="border-t border-white/8 px-3 py-2 bg-black/20">
-                    <div className="text-xs font-medium text-zinc-500 mb-1">参数:</div>
-                    <pre className="rounded-lg bg-black/40 p-2 text-xs overflow-x-auto text-zinc-400 font-mono whitespace-pre-wrap break-all">
+                  <div className="border-t border-[var(--border-color)] px-3 py-2 bg-[var(--overlay-dim)]">
+                    <div className="text-xs font-medium text-[var(--text-muted)] mb-1">参数:</div>
+                    <pre className="rounded-lg bg-[var(--overlay-dim-heavy)] p-2 text-xs overflow-x-auto text-[var(--text-secondary)] font-mono whitespace-pre-wrap break-all">
                       {JSON.stringify(tool.arguments, null, 2)}
                     </pre>
                   </div>
diff --git a/web/src/components/Sidebar/SchedulerJobList.tsx b/web/src/components/Sidebar/SchedulerJobList.tsx
index 9c80e1f..225c4ea 100644
--- a/web/src/components/Sidebar/SchedulerJobList.tsx
+++ b/web/src/components/Sidebar/SchedulerJobList.tsx
@@ -68,7 +68,7 @@ function lastStatusIcon(lastStatus: string | undefined) {
     case 'error':
       return <X className="h-3 w-3 text-red-400" />
     default:
-      return <Minus className="h-3 w-3 text-zinc-500" />
+      return <Minus className="h-3 w-3 text-[var(--text-muted)]" />
   }
 }
 
@@ -76,17 +76,17 @@ export function SchedulerJobList({ jobs, onRefresh, onViewJob, sessionId }: Sche
   return (
     <div className="flex h-full flex-col">
       {/* Header */}
-      <div className="flex items-center justify-between border-b border-white/8 px-3 py-2.5">
-        <h2 className="font-semibold text-white flex items-center gap-2 text-sm">
-          <Clock className="h-4 w-4 text-[#00f0ff]" />
+      <div className="flex items-center justify-between border-b border-[var(--border-color)] px-3 py-2.5">
+        <h2 className="font-semibold text-[var(--text-primary)] flex items-center gap-2 text-sm">
+          <Clock className="h-4 w-4 text-[var(--accent-cyan)]" />
           定时任务
           {jobs.length > 0 && (
-            <span className="text-xs text-zinc-500">({jobs.length})</span>
+            <span className="text-xs text-[var(--text-muted)]">({jobs.length})</span>
           )}
         </h2>
         <button
           onClick={onRefresh}
-          className="flex items-center gap-1 rounded-lg px-2 py-1 text-xs text-zinc-400 hover:text-white hover:bg-white/10 transition-all"
+          className="flex items-center gap-1 rounded-lg px-2 py-1 text-xs text-[var(--text-secondary)] hover:text-[var(--text-primary)] hover:bg-[var(--overlay-subtle)] transition-all"
         >
           <RefreshCw className="h-3.5 w-3.5" />
           刷新
@@ -96,12 +96,12 @@ export function SchedulerJobList({ jobs, onRefresh, onViewJob, sessionId }: Sche
       {/* Job List */}
       <div className="flex-1 overflow-y-auto p-2">
         {!sessionId ? (
-          <div className="p-4 text-center text-sm text-zinc-500">
+          <div className="p-4 text-center text-sm text-[var(--text-muted)]">
             <Clock className="h-8 w-8 mx-auto mb-2 opacity-50" />
             <p>等待连接...</p>
           </div>
         ) : jobs.length === 0 ? (
-          <div className="p-4 text-center text-sm text-zinc-500">
+          <div className="p-4 text-center text-sm text-[var(--text-muted)]">
             <Clock className="h-8 w-8 mx-auto mb-2 opacity-50" />
             <p>暂无定时任务</p>
           </div>
@@ -121,23 +121,23 @@ export function SchedulerJobList({ jobs, onRefresh, onViewJob, sessionId }: Sche
                   disabled={!hasLookup}
                   className={`w-full rounded-lg px-3 py-2.5 text-left transition-all border ${
                     hasLookup
-                      ? 'hover:bg-white/5 border-transparent hover:border-white/10 cursor-pointer'
+                      ? 'hover:bg-[var(--overlay-hover)] border-transparent hover:border-[var(--border-color)] cursor-pointer'
                       : 'border-transparent cursor-default opacity-70'
                   }`}
                 >
                   {/* Row 1: ID + kind + enabled */}
                   <div className="flex items-center justify-between mb-1">
                     <div className="flex items-center gap-1.5 min-w-0 flex-1">
-                      <span className="text-xs text-zinc-500 font-mono truncate max-w-[120px]">
+                      <span className="text-xs text-[var(--text-muted)] font-mono truncate max-w-[120px]">
                         {job.id}
                       </span>
-                      <span className="text-xs px-1.5 py-0.5 rounded bg-white/10 text-zinc-300 shrink-0">
+                      <span className="text-xs px-1.5 py-0.5 rounded bg-[var(--overlay-subtle)] text-[var(--text-secondary)] shrink-0">
                         {kindLabel(job.kind)}
                       </span>
                     </div>
                     <div className="flex items-center gap-1.5 shrink-0">
                       <span className={`inline-block h-1.5 w-1.5 rounded-full ${job.enabled ? 'bg-emerald-400' : 'bg-zinc-600'}`} />
-                      {hasLookup && <ChevronRight className="h-3.5 w-3.5 text-zinc-600" />}
+                      {hasLookup && <ChevronRight className="h-3.5 w-3.5 text-[var(--text-muted)]" />}
                     </div>
                   </div>
 
@@ -147,11 +147,11 @@ export function SchedulerJobList({ jobs, onRefresh, onViewJob, sessionId }: Sche
                       {badge.pulse && <span className="inline-block h-1.5 w-1.5 rounded-full bg-amber-400 animate-pulse" />}
                       {badge.label}
                     </span>
-                    <span className="inline-flex items-center gap-0.5 text-xs text-zinc-500">
+                    <span className="inline-flex items-center gap-0.5 text-xs text-[var(--text-muted)]">
                       {lastStatusIcon(job.last_status)}
                       <span className={
                         job.last_status === 'error' ? 'text-red-400' :
-                        job.last_status === 'ok' ? 'text-emerald-400' : 'text-zinc-500'
+                        job.last_status === 'ok' ? 'text-emerald-400' : 'text-[var(--text-muted)]'
                       }>
                         {job.last_status === 'ok' ? '正常' :
                          job.last_status === 'error' ? '异常' :
@@ -168,17 +168,17 @@ export function SchedulerJobList({ jobs, onRefresh, onViewJob, sessionId }: Sche
                   )}
 
                   {/* Row 4: Run count + schedule */}
-                  <div className="flex items-center justify-between text-xs text-zinc-500 mb-1">
+                  <div className="flex items-center justify-between text-xs text-[var(--text-muted)] mb-1">
                     <span>
                       执行: {job.run_count}{job.max_runs ? `/${job.max_runs}` : ''}
                     </span>
-                    <span className="truncate max-w-[120px] text-zinc-600">
+                    <span className="truncate max-w-[120px] text-[var(--text-muted)]">
                       {scheduleDescription(job.schedule)}
                     </span>
                   </div>
 
                   {/* Row 5: Times */}
-                  <div className="flex items-center justify-between text-xs text-zinc-600">
+                  <div className="flex items-center justify-between text-xs text-[var(--text-muted)]">
                     <span>上次: {formatTime(job.last_fired_at)}</span>
                     <span>下次: {formatTime(job.next_fire_at)}</span>
                   </div>
diff --git a/web/src/components/Sidebar/SessionInfo.tsx b/web/src/components/Sidebar/SessionInfo.tsx
index ab6bdae..80b5423 100644
--- a/web/src/components/Sidebar/SessionInfo.tsx
+++ b/web/src/components/Sidebar/SessionInfo.tsx
@@ -10,36 +10,36 @@ export function SessionInfo({ session, connectionId }: SessionInfoProps) {
   return (
     <div className="p-4">
       <div className="flex items-center gap-2 mb-3">
-        <Wifi className="h-4 w-4 text-[#00f0ff]" />
-        <span className="text-sm font-medium text-white">WebSocket</span>
+        <Wifi className="h-4 w-4 text-[var(--accent-cyan)]" />
+        <span className="text-sm font-medium text-[var(--text-primary)]">WebSocket</span>
         <span className="text-xs px-1.5 py-0.5 rounded bg-emerald-500/20 text-emerald-400">
           在线
         </span>
       </div>
 
-      <div className="rounded-xl border border-white/10 bg-[#1a1a25]/80 p-3">
+      <div className="rounded-xl border border-[var(--border-color)] bg-[var(--bg-tertiary)]/80 p-3">
         <div className="flex items-center gap-2 mb-2">
-          <FolderOpen className="h-4 w-4 text-zinc-400" />
-          <span className="text-xs text-zinc-500 uppercase tracking-wider">当前会话</span>
+          <FolderOpen className="h-4 w-4 text-[var(--text-secondary)]" />
+          <span className="text-xs text-[var(--text-muted)] uppercase tracking-wider">当前会话</span>
         </div>
 
         {session ? (
           <div className="space-y-1">
-            <p className="text-sm font-medium text-white truncate">
+            <p className="text-sm font-medium text-[var(--text-primary)] truncate">
               {session.title}
             </p>
-            <div className="flex items-center gap-1 text-xs text-zinc-500">
+            <div className="flex items-center gap-1 text-xs text-[var(--text-muted)]">
               <Hash className="h-3 w-3" />
               <span className="font-mono">{session.id.slice(0, 8)}...</span>
             </div>
           </div>
         ) : (
-          <p className="text-sm text-zinc-500">连接中...</p>
+          <p className="text-sm text-[var(--text-muted)]">连接中...</p>
         )}
 
         {connectionId && (
-          <div className="mt-2 pt-2 border-t border-white/10">
-            <p className="text-xs text-zinc-600 font-mono">
+          <div className="mt-2 pt-2 border-t border-[var(--border-color)]">
+            <p className="text-xs text-[var(--text-muted)] font-mono">
               conn: {connectionId.slice(0, 8)}...
             </p>
           </div>
diff --git a/web/src/components/Sidebar/TopicList.tsx b/web/src/components/Sidebar/TopicList.tsx
index 0514948..5e18650 100644
--- a/web/src/components/Sidebar/TopicList.tsx
+++ b/web/src/components/Sidebar/TopicList.tsx
@@ -39,12 +39,12 @@ export function TopicList({
   return (
     <div className="flex h-full flex-col">
       {/* Header */}
-      <div className="flex items-center justify-between border-b border-white/8 px-4 py-3">
-        <h2 className="font-semibold text-white flex items-center gap-2 text-sm">
-          <Layers className="h-4 w-4 text-[#00f0ff]" />
+      <div className="flex items-center justify-between border-b border-[var(--border-color)] px-4 py-3">
+        <h2 className="font-semibold text-[var(--text-primary)] flex items-center gap-2 text-sm">
+          <Layers className="h-4 w-4 text-[var(--accent-cyan)]" />
           话题列表
           {topics.length > 0 && (
-            <span className="text-xs text-zinc-500">({topics.length})</span>
+            <span className="text-xs text-[var(--text-muted)]">({topics.length})</span>
           )}
         </h2>
         <button
@@ -52,8 +52,8 @@ export function TopicList({
           disabled={isReadOnly || !sessionId}
           className={`flex items-center gap-1 rounded-lg px-3 py-1.5 text-sm transition-all ${
             isReadOnly || !sessionId
-              ? 'bg-zinc-500/10 text-zinc-500 cursor-not-allowed'
-              : 'bg-[#00f0ff]/10 text-[#00f0ff] hover:bg-[#00f0ff]/20 border border-[#00f0ff]/30'
+              ? 'bg-[var(--overlay-subtle)] text-[var(--text-muted)] cursor-not-allowed'
+              : 'bg-[var(--accent-cyan)]/10 text-[var(--accent-cyan)] hover:bg-[var(--accent-cyan)]/20 border border-[var(--accent-cyan)]/30'
           }`}
         >
           <Plus className="h-4 w-4" />
@@ -63,21 +63,21 @@ export function TopicList({
 
       {/* Session 标题 */}
       {sessionTitle && (
-        <div className="px-4 py-2 border-b border-white/8 bg-[#00f0ff]/5">
-          <p className="text-xs text-zinc-500 mb-1">所属会话</p>
-          <p className="text-sm text-zinc-300 font-medium truncate">{sessionTitle}</p>
+        <div className="px-4 py-2 border-b border-[var(--border-color)] bg-[var(--accent-cyan)]/5">
+          <p className="text-xs text-[var(--text-muted)] mb-1">所属会话</p>
+          <p className="text-sm text-[var(--text-secondary)] font-medium truncate">{sessionTitle}</p>
         </div>
       )}
 
       {/* Topics 列表 */}
       <div className="flex-1 overflow-y-auto p-3">
         {!sessionId ? (
-          <div className="p-4 text-center text-sm text-zinc-500">
+          <div className="p-4 text-center text-sm text-[var(--text-muted)]">
             <MessageSquare className="h-8 w-8 mx-auto mb-2 opacity-50" />
             <p>等待连接...</p>
           </div>
         ) : topics.length === 0 ? (
-          <div className="p-4 text-center text-sm text-zinc-500">
+          <div className="p-4 text-center text-sm text-[var(--text-muted)]">
             <MessageSquare className="h-8 w-8 mx-auto mb-2 opacity-50" />
             <p>暂无话题</p>
             <p className="text-xs mt-1">点击上方"新建"创建话题</p>
@@ -90,33 +90,33 @@ export function TopicList({
                 onClick={() => onSwitchTopic(topic.id)}
                 className={`w-full rounded-xl px-3 py-3 text-left text-sm transition-all ${
                   topic.id === currentTopicId
-                    ? 'bg-gradient-to-r from-[#00f0ff]/20 to-transparent border border-[#00f0ff]/30'
-                    : 'hover:bg-white/5 border border-transparent'
+                    ? 'bg-gradient-to-r from-[var(--accent-cyan)]/20 to-transparent border border-[var(--accent-cyan)]/30'
+                    : 'hover:bg-[var(--overlay-hover)] border border-transparent'
                 }`}
               >
                 <div className="flex items-start gap-3">
-                  <span className="mt-0.5 text-xs text-zinc-500 font-mono w-4">
+                  <span className="mt-0.5 text-xs text-[var(--text-muted)] font-mono w-4">
                     {index + 1}
                   </span>
                   <div className="min-w-0 flex-1">
                     <div className={`truncate font-medium ${
-                      topic.id === currentTopicId ? 'text-[#00f0ff]' : 'text-zinc-300'
+                      topic.id === currentTopicId ? 'text-[var(--accent-cyan)]' : 'text-[var(--text-secondary)]'
                     }`}>
                       {topic.description || topic.title}
                     </div>
                     <div className="flex items-center gap-3 mt-1.5">
-                      <span className="text-xs text-zinc-500 flex items-center gap-1">
+                      <span className="text-xs text-[var(--text-muted)] flex items-center gap-1">
                         <Hash className="h-3 w-3" />
                         {topic.message_count} 条消息
                       </span>
-                      <span className="text-xs text-zinc-600 flex items-center gap-1">
+                      <span className="text-xs text-[var(--text-muted)] flex items-center gap-1">
                         <Clock className="h-3 w-3" />
                         {formatTime(topic.updated_at)}
                       </span>
                     </div>
                   </div>
                   {topic.id === currentTopicId && (
-                    <span className="inline-block h-2 w-2 rounded-full bg-[#00f0ff] shadow-lg shadow-[#00f0ff]/50 mt-1.5" />
+                    <span className="inline-block h-2 w-2 rounded-full bg-[var(--accent-cyan)] shadow-lg shadow-[var(--shadow-glow-soft)] mt-1.5" />
                   )}
                 </div>
               </button>
diff --git a/web/src/index.css b/web/src/index.css
index 8b1e012..b6bd62b 100644
--- a/web/src/index.css
+++ b/web/src/index.css
@@ -1,6 +1,8 @@
 @import "tailwindcss";
 
-/* PicoBot Theme - Tech Dark */
+/* ============================================
+   PicoBot Theme — Dark (default)
+   ============================================ */
 :root {
   /* Core colors */
   --bg-primary: #0a0a0f;
@@ -24,9 +26,104 @@
   /* Border */
   --border-color: rgba(255, 255, 255, 0.08);
   --border-accent: rgba(0, 240, 255, 0.3);
+
+  /* Overlay — for hover / subtle surface effects */
+  --overlay-hover:      rgba(255, 255, 255, 0.05);
+  --overlay-subtle:     rgba(255, 255, 255, 0.10);
+  --overlay-medium:     rgba(255, 255, 255, 0.20);
+  --overlay-dim:        rgba(0, 0, 0, 0.20);
+  --overlay-dim-strong: rgba(0, 0, 0, 0.30);
+  --overlay-dim-heavy:  rgba(0, 0, 0, 0.40);
+  --overlay-code:       rgba(0, 0, 0, 0.30);
+
+  /* Shadows */
+  --shadow-glow-sm:     rgba(0, 240, 255, 0.12);
+  --shadow-glow:        rgba(0, 240, 255, 0.20);
+  --shadow-glow-strong: rgba(0, 240, 255, 0.30);
+  --shadow-glow-soft:   rgba(0, 240, 255, 0.50);
+
+  /* Focus ring */
+  --focus-ring:         rgba(0, 240, 255, 0.20);
+
+  /* Selection / code highlight */
+  --selection-bg:       rgba(0, 240, 255, 0.30);
+
+  /* Divider */
+  --divider-color:      rgba(255, 255, 255, 0.20);
+
+  color-scheme: dark;
 }
 
-/* Custom scrollbar */
+/* ============================================
+   PicoBot Theme — Light
+   ============================================ */
+html.light {
+  /* Backgrounds */
+  --bg-primary:    #f5f5f7;
+  --bg-secondary:  #ffffff;
+  --bg-tertiary:   #ebecf0;
+  --bg-hover:      #dfe0e5;
+
+  /* Accents — slightly darker for readability on white */
+  --accent-cyan:    #008899;
+  --accent-blue:    #2563eb;
+  --accent-purple:  #7c3aed;
+  --accent-green:   #059669;
+  --accent-amber:   #d97706;
+
+  /* Text */
+  --text-primary:   #1a1a2e;
+  --text-secondary: #52525b;
+  --text-muted:     #a1a1aa;
+  --text-accent:    var(--accent-cyan);
+
+  /* Borders */
+  --border-color:   rgba(0, 0, 0, 0.08);
+  --border-accent:  rgba(0, 136, 153, 0.30);
+
+  /* Overlays */
+  --overlay-hover:      rgba(0, 0, 0, 0.04);
+  --overlay-subtle:     rgba(0, 0, 0, 0.06);
+  --overlay-medium:     rgba(0, 0, 0, 0.10);
+  --overlay-dim:        rgba(0, 0, 0, 0.04);
+  --overlay-dim-strong: rgba(0, 0, 0, 0.06);
+  --overlay-dim-heavy:  rgba(0, 0, 0, 0.08);
+  --overlay-code:       rgba(0, 0, 0, 0.06);
+
+  /* Shadows — softer */
+  --shadow-glow-sm:     rgba(0, 136, 153, 0.10);
+  --shadow-glow:        rgba(0, 136, 153, 0.15);
+  --shadow-glow-strong: rgba(0, 136, 153, 0.22);
+  --shadow-glow-soft:   rgba(0, 136, 153, 0.35);
+
+  /* Focus ring */
+  --focus-ring:         rgba(0, 136, 153, 0.20);
+
+  /* Selection / code highlight */
+  --selection-bg:       rgba(0, 136, 153, 0.20);
+
+  /* Divider */
+  --divider-color:      rgba(0, 0, 0, 0.10);
+
+  color-scheme: light;
+}
+
+/* ============================================
+   Smooth theme transition
+   ============================================ */
+html.theme-transitioning *,
+html.theme-transitioning *::before,
+html.theme-transitioning *::after {
+  transition: background-color 0.3s ease,
+              color 0.3s ease,
+              border-color 0.3s ease,
+              box-shadow 0.3s ease,
+              text-shadow 0.3s ease !important;
+}
+
+/* ============================================
+   Custom scrollbar
+   ============================================ */
 ::-webkit-scrollbar {
   width: 6px;
   height: 6px;
@@ -55,7 +152,9 @@
   display: none;
 }
 
-/* Base styles */
+/* ============================================
+   Base styles
+   ============================================ */
 * {
   box-sizing: border-box;
 }
@@ -71,20 +170,26 @@ body {
   line-height: 1.6;
 }
 
-/* Custom selection */
+/* ============================================
+   Custom selection
+   ============================================ */
 ::selection {
-  background: rgba(0, 240, 255, 0.3);
+  background: var(--selection-bg);
   color: var(--text-primary);
 }
 
-/* Glowing text effect */
+/* ============================================
+   Glowing text effect
+   ============================================ */
 .glow-text {
-  text-shadow: 0 0 10px rgba(0, 240, 255, 0.5),
-               0 0 20px rgba(0, 240, 255, 0.3),
-               0 0 30px rgba(0, 240, 255, 0.1);
+  text-shadow: 0 0 10px var(--shadow-glow-soft),
+               0 0 20px var(--shadow-glow-strong),
+               0 0 30px var(--shadow-glow-sm);
 }
 
-/* Gradient border */
+/* ============================================
+   Gradient border
+   ============================================ */
 .gradient-border {
   position: relative;
 }
@@ -106,7 +211,9 @@ body {
   mask-composite: exclude;
 }
 
-/* Animations */
+/* ============================================
+   Animations
+   ============================================ */
 @keyframes pulse-glow {
   0%, 100% {
     box-shadow: 0 0 5px var(--accent-cyan),
@@ -132,63 +239,35 @@ body {
 }
 
 @keyframes fade-in {
-  from {
-    opacity: 0;
-  }
-  to {
-    opacity: 1;
-  }
+  from { opacity: 0; }
+  to   { opacity: 1; }
 }
 
 @keyframes typing-dot {
-  0%, 60%, 100% {
-    transform: translateY(0);
-  }
-  30% {
-    transform: translateY(-4px);
-  }
+  0%, 60%, 100% { transform: translateY(0); }
+  30%           { transform: translateY(-4px); }
 }
 
 @keyframes scale-in {
-  0% {
-    opacity: 0;
-    transform: scale(0.5);
-  }
-  50% {
-    transform: scale(1.1);
-  }
-  100% {
-    opacity: 1;
-    transform: scale(1);
-  }
+  0%   { opacity: 0; transform: scale(0.5); }
+  50%  { transform: scale(1.1); }
+  100% { opacity: 1; transform: scale(1); }
 }
 
-.animate-slide-in {
-  animation: slide-in 0.3s ease-out;
-}
-
-.animate-fade-in {
-  animation: fade-in 0.2s ease-out;
-}
-
-.animate-scale-in {
-  animation: scale-in 0.3s ease-out;
-}
+.animate-slide-in { animation: slide-in 0.3s ease-out; }
+.animate-fade-in  { animation: fade-in 0.2s ease-out; }
+.animate-scale-in { animation: scale-in 0.3s ease-out; }
 
 .typing-indicator span {
   animation: typing-dot 1.4s infinite;
   display: inline-block;
 }
+.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
+.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
 
-.typing-indicator span:nth-child(2) {
-  animation-delay: 0.2s;
-}
-
-.typing-indicator span:nth-child(3) {
-  animation-delay: 0.4s;
-}
-
-/* Code block styling */
+/* ============================================
+   Code block styling
+   ============================================ */
 pre {
   background: var(--bg-tertiary);
   border: 1px solid var(--border-color);
@@ -202,15 +281,19 @@ code {
   font-size: 0.9em;
 }
 
-/* Focus styles */
+/* ============================================
+   Focus styles
+   ============================================ */
 input:focus,
 textarea:focus {
   outline: none;
   border-color: var(--accent-cyan);
-  box-shadow: 0 0 0 2px rgba(0, 240, 255, 0.2);
+  box-shadow: 0 0 0 2px var(--focus-ring);
 }
 
-/* Button hover effects */
+/* ============================================
+   Button hover effects
+   ============================================ */
 button {
   transition: all 0.2s ease;
 }
@@ -223,7 +306,9 @@ button:active:not(:disabled) {
   transform: translateY(0);
 }
 
-/* Link styles */
+/* ============================================
+   Link styles
+   ============================================ */
 a {
   color: var(--accent-cyan);
   text-decoration: none;