diff --git a/frontend-web/src/components/ui/sidebar.tsx b/frontend-web/src/components/ui/sidebar.tsx
index c62bf163..2e6d3ca1 100644
--- a/frontend-web/src/components/ui/sidebar.tsx
+++ b/frontend-web/src/components/ui/sidebar.tsx
@@ -139,7 +139,7 @@ function SidebarProvider({
             } as React.CSSProperties
           }
           className={cn(
-            "group/sidebar-wrapper has-data-[variant=inset]:bg-sidebar flex min-h-svh w-full",
+            "group/sidebar-wrapper has-data-[variant=inset]:bg-sidebar flex h-full w-full",
             className,
           )}
           {...props}
@@ -229,7 +229,7 @@ function Sidebar({
       <div
         data-slot="sidebar-container"
         className={cn(
-          "fixed inset-y-0 z-10 hidden h-svh w-(--sidebar-width) transition-[left,right,width] duration-200 ease-linear md:flex",
+          "fixed top-16 bottom-0 z-10 hidden w-(--sidebar-width) transition-[left,right,width] duration-200 ease-linear md:flex",
           side === "left"
             ? "left-0 group-data-[collapsible=offcanvas]:left-[calc(var(--sidebar-width)*-1)]"
             : "right-0 group-data-[collapsible=offcanvas]:right-[calc(var(--sidebar-width)*-1)]",
@@ -309,7 +309,7 @@ function SidebarInset({ className, ...props }: React.ComponentProps<"main">) {
     <main
       data-slot="sidebar-inset"
       className={cn(
-        "bg-[#fffdfa] relative flex w-full flex-1 flex-col",
+        "bg-background relative flex w-full flex-1 flex-col",
         "md:peer-data-[variant=inset]:m-2 md:peer-data-[variant=inset]:ml-0 md:peer-data-[variant=inset]:rounded-xl md:peer-data-[variant=inset]:shadow-sm md:peer-data-[variant=inset]:peer-data-[state=collapsed]:ml-2",
         className,
       )}
diff --git a/frontend-web/src/components/workspace/input-box.tsx b/frontend-web/src/components/workspace/input-box.tsx
index 8ae851ac..84841c53 100644
--- a/frontend-web/src/components/workspace/input-box.tsx
+++ b/frontend-web/src/components/workspace/input-box.tsx
@@ -449,7 +449,7 @@ export function InputBox({
             <button
               key={q.id}
               type="button"
-              className="rounded-full border border-[#e4e4e7] bg-white px-4 py-2 text-sm text-[#18181b] shadow-none transition-colors hover:bg-[#f4f4f5] cursor-pointer"
+              className="rounded-full border border-[#e4e4e7] bg-white px-4 py-2 text-sm text-[#18181b] shadow-none transition-colors hover:bg-[#f4f4f5] cursor-pointer dark:border-slate-600 dark:bg-slate-700/50 dark:text-slate-300 dark:hover:bg-slate-700"
               onClick={() => {
                 textInput.setInput(q.content);
                 setFollowupsHidden(true);
@@ -495,7 +495,7 @@ export function InputBox({
       )}
       <PromptInput
         className={cn(
-          "rounded-[1.85rem] border border-[#eadfce] bg-white shadow-[0_24px_70px_-34px_rgba(120,83,42,0.32)] ring-1 ring-[#f6efe5] transition-all duration-300 ease-out *:data-[slot='input-group']:rounded-[1.85rem]",
+          "rounded-[1.85rem] border border-[#eadfce] bg-white shadow-[0_24px_70px_-34px_rgba(120,83,42,0.32)] ring-1 ring-[#f6efe5] transition-all duration-300 ease-out *:data-[slot='input-group']:rounded-[1.85rem] dark:bg-slate-800 dark:border-slate-700 dark:ring-slate-700 dark:shadow-none",
           className,
         )}
         disabled={disabled}
@@ -510,7 +510,7 @@ export function InputBox({
         <PromptInputBody className="absolute top-0 right-0 left-0 z-3">
           <PromptInputTextarea
             className={cn(
-              "size-full px-2 py-1 text-[15px] leading-7 placeholder:text-[#b7ab9a]",
+              "size-full px-2 py-1 text-[15px] leading-7 placeholder:text-[#b7ab9a] dark:placeholder:text-slate-500",
             )}
             disabled={disabled}
             placeholder={t.inputBox.placeholder}
@@ -518,7 +518,7 @@ export function InputBox({
             defaultValue={initialValue}
           />
         </PromptInputBody>
-        <PromptInputFooter className="flex items-center border-t border-[#f4ede4] px-2 pt-2.5 pb-1.5">
+        <PromptInputFooter className="flex items-center border-t border-[#f4ede4] dark:border-slate-700 px-2 pt-2.5 pb-1.5">
           <PromptInputTools className="gap-1.5">
             {/* TODO: Add more connectors here
           <PromptInputActionMenu>
@@ -529,7 +529,7 @@ export function InputBox({
               />
             </PromptInputActionMenuContent>
           </PromptInputActionMenu> */}
-            <AddAttachmentsButton className="rounded-full border border-[#eee3d5] bg-[#fffaf5] px-2.5! shadow-none hover:bg-white" />
+            <AddAttachmentsButton className="rounded-full border border-[#eee3d5] bg-[#fffaf5] px-2.5! shadow-none hover:bg-white dark:border-slate-600 dark:bg-slate-700/50 dark:text-slate-300 dark:hover:bg-slate-700" />
             <PromptInputActionMenu>
               <ModeHoverGuide
                 mode={
@@ -541,7 +541,7 @@ export function InputBox({
                     : "flash"
                 }
               >
-                <PromptInputActionMenuTrigger className="gap-1.5! rounded-full border border-[#eee3d5] bg-[#fffaf5] px-3! text-[#7e6a57] shadow-none hover:bg-white">
+                <PromptInputActionMenuTrigger className="gap-1.5! rounded-full border border-[#eee3d5] bg-[#fffaf5] px-3! text-[#7e6a57] shadow-none hover:bg-white dark:border-slate-600 dark:bg-slate-700/50 dark:text-slate-300 dark:hover:bg-slate-700">
                   <div>
                     {context.mode === "flash" && <ZapIcon className="size-3" />}
                     {context.mode === "thinking" && (
@@ -703,7 +703,7 @@ export function InputBox({
             </PromptInputActionMenu>
             {supportReasoningEffort && context.mode !== "flash" && (
               <PromptInputActionMenu>
-                <PromptInputActionMenuTrigger className="gap-1.5! rounded-full border border-[#eee3d5] bg-[#fffaf5] px-3! text-[#7e6a57] shadow-none hover:bg-white">
+                <PromptInputActionMenuTrigger className="gap-1.5! rounded-full border border-[#eee3d5] bg-[#fffaf5] px-3! text-[#7e6a57] shadow-none hover:bg-white dark:border-slate-600 dark:bg-slate-700/50 dark:text-slate-300 dark:hover:bg-slate-700">
                   <div className="text-xs font-normal">
                     {t.inputBox.reasoningEffort}:
                     {context.reasoning_effort === "minimal" &&
@@ -824,7 +824,7 @@ export function InputBox({
               onOpenChange={setModelDialogOpen}
             >
               <ModelSelectorTrigger asChild>
-                <PromptInputButton className="rounded-full border border-[#eee3d5] bg-[#fffaf5] px-3 shadow-none hover:bg-white">
+                <PromptInputButton className="rounded-full border border-[#eee3d5] bg-[#fffaf5] px-3 shadow-none hover:bg-white dark:border-slate-600 dark:bg-slate-700/50 dark:text-slate-300 dark:hover:bg-slate-700">
                   <div className="flex min-w-0 flex-col items-start text-left">
                     <ModelSelectorName className="text-xs font-normal">
                       {selectedModel?.display_name}
@@ -858,7 +858,7 @@ export function InputBox({
               </ModelSelectorContent>
             </ModelSelector>
             <PromptInputSubmit
-              className="rounded-full border-[#e7d9c7] bg-white shadow-[0_10px_24px_-18px_rgba(120,83,42,0.34)]"
+              className="rounded-full border-[#e7d9c7] bg-white shadow-[0_10px_24px_-18px_rgba(120,83,42,0.34)] dark:bg-blue-500 dark:border-blue-500 dark:text-white dark:hover:bg-blue-400 dark:shadow-none"
               disabled={disabled}
               variant="outline"
               status={status}
@@ -866,7 +866,7 @@ export function InputBox({
           </PromptInputTools>
         </PromptInputFooter>
         {!isNewThread && (
-          <div className="absolute right-0 -bottom-[17px] left-0 z-0 h-4 bg-[#fffdfa]"></div>
+          <div className="absolute right-0 -bottom-[17px] left-0 z-0 h-4 bg-[#fffdfa] dark:bg-background"></div>
         )}
       </PromptInput>
 
diff --git a/frontend-web/src/contexts/ThemeContext.tsx b/frontend-web/src/contexts/ThemeContext.tsx
index c6ce37b8..a4042ae7 100644
--- a/frontend-web/src/contexts/ThemeContext.tsx
+++ b/frontend-web/src/contexts/ThemeContext.tsx
@@ -39,16 +39,16 @@ const themes: Record<ThemeType, ThemeConfig> = {
       textSecondary: 'slate-400',
       primary: 'blue-500',
       primaryHover: 'blue-400',
-      border: 'blue-800',
-      accent: 'cyan-400',
+      border: 'slate-700',
+      accent: 'blue-600',
       success: 'emerald-500',
       warning: 'amber-500',
       error: 'rose-500',
       card: 'slate-800',
       cardHover: 'slate-700',
       input: 'slate-800',
-      inputBorder: 'blue-800',
-      overlay: 'slate-900/50',
+      inputBorder: 'slate-600',
+      overlay: 'slate-900/80',
     },
   },
   light: {
diff --git a/frontend-web/src/pages/PageRoutes.tsx b/frontend-web/src/pages/PageRoutes.tsx
index b227d3ad..78f2445e 100644
--- a/frontend-web/src/pages/PageRoutes.tsx
+++ b/frontend-web/src/pages/PageRoutes.tsx
@@ -4,6 +4,7 @@ import { Navigate, Route, Routes } from "react-router-dom";
 import { PageSidebar } from "@/components/page-sidebar";
 
 import WorkspaceRoutes from "./WorkspaceRoutes";
+import Header from "@/strategy-components/Header";
 
 // 设为 true 时隐藏侧边栏（开发中，暂未完成）
 const SIDEBAR_ENABLED = false;
@@ -12,31 +13,34 @@ function PageLayout() {
   const [collapsed, setCollapsed] = useState(false);
 
   return (
-    <div className="min-h-screen bg-muted/20">
+    <div className="h-screen flex bg-muted/20">
       {SIDEBAR_ENABLED && (
         <PageSidebar
           collapsed={collapsed}
           onToggleCollapsed={() => setCollapsed((prev) => !prev)}
         />
       )}
-      <main
-        className={`min-h-screen transition-[padding] duration-300 ${
-          !SIDEBAR_ENABLED ? "" : collapsed ? "pl-16" : "pl-16 md:pl-64"
+      <div
+        className={`flex flex-col flex-1 overflow-hidden transition-[padding] duration-300 ${
+          !SIDEBAR_ENABLED ? "" : collapsed ? "pl-16" : "pl-64"
         }`}
       >
-        <Routes>
-          <Route index element={<Navigate to="workspace" replace />} />
-          <Route
-            path="workspace/*"
-            element={
-              <WorkspaceRoutes
-                pageSidebarCollapsed={collapsed}
-                pageSidebarHidden={!SIDEBAR_ENABLED}
-              />
-            }
-          />
-        </Routes>
-      </main>
+        <Header />
+        <main className="flex-1 overflow-hidden">
+          <Routes>
+            <Route index element={<Navigate to="workspace" replace />} />
+            <Route
+              path="workspace/*"
+              element={
+                <WorkspaceRoutes
+                  pageSidebarCollapsed={collapsed}
+                  pageSidebarHidden={!SIDEBAR_ENABLED}
+                />
+              }
+            />
+          </Routes>
+        </main>
+      </div>
     </div>
   );
 }
diff --git a/frontend-web/src/pages/WorkspaceRoutes.tsx b/frontend-web/src/pages/WorkspaceRoutes.tsx
index eaf676f5..a69ab007 100644
--- a/frontend-web/src/pages/WorkspaceRoutes.tsx
+++ b/frontend-web/src/pages/WorkspaceRoutes.tsx
@@ -37,7 +37,7 @@ function WorkspaceLayout({
 
   return (
     <SidebarProvider
-      className="h-screen w-full overflow-x-hidden [&_[data-slot=sidebar-container]]:left-[var(--page-sidebar-width)]"
+      className="h-full w-full overflow-x-hidden [&_[data-slot=sidebar-container]]:left-[var(--page-sidebar-width)]"
       style={
         {
           "--page-sidebar-width": pageSidebarWidth,
diff --git a/frontend-web/src/strategy-components/Header.tsx b/frontend-web/src/strategy-components/Header.tsx
new file mode 100644
index 00000000..78c5d1d8
--- /dev/null
+++ b/frontend-web/src/strategy-components/Header.tsx
@@ -0,0 +1,83 @@
+import React from 'react';
+import { Bell, Search, User, ChevronDown, Moon, Sun, Palette } from 'lucide-react';
+import { useTheme } from '../contexts/ThemeContext';
+
+const Header: React.FC = () => {
+  const { theme, toggleTheme } = useTheme();
+  const isDark = theme === 'dark';
+
+  return (
+    <header className={`h-16 flex items-center justify-between px-6 theme-transition ${
+      isDark
+        ? 'bg-slate-900/50 backdrop-blur-xl border-b border-blue-800/30'
+        : 'bg-red-600 border-b border-red-700'
+    }`}>
+      {/* 左侧 - 搜索框 */}
+      <div className="flex items-center gap-4">
+        <div className="relative">
+          <Search className={`absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 ${isDark ? 'text-slate-500' : 'text-red-200'}`} />
+          <input
+            type="text"
+            placeholder="搜索场景、智能体、任务..."
+            className={`w-80 pl-10 pr-4 py-2 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-white/20 transition-all duration-200 theme-transition ${
+              isDark
+                ? 'bg-slate-800/50 border border-blue-800/30 text-white placeholder-slate-500'
+                : 'bg-red-700 border border-red-800 text-white placeholder-red-200'
+            }`}
+          />
+        </div>
+      </div>
+
+      {/* 右侧 - 用户信息和通知 */}
+      <div className="flex items-center gap-4">
+        {/* 主题切换按钮 */}
+        <button
+          onClick={toggleTheme}
+          className={`p-2 rounded-lg transition-all duration-200 ${
+            isDark
+              ? 'hover:bg-slate-800/50 text-slate-400 hover:text-white'
+              : 'hover:bg-red-500 text-white'
+          }`}
+          title={isDark ? '切换到红白主题' : '切换到深色主题'}
+        >
+          {isDark ? (
+            <Palette className="w-5 h-5" />
+          ) : (
+            <Moon className="w-5 h-5" />
+          )}
+        </button>
+
+        {/* 通知 */}
+        <button className={`relative p-2 rounded-lg transition-colors ${
+          isDark ? 'hover:bg-slate-800/50' : 'hover:bg-red-500'
+        }`}>
+          <Bell className={`w-5 h-5 ${isDark ? 'text-slate-400' : 'text-white'}`} />
+          <span className={`absolute top-1 right-1 w-2 h-2 rounded-full ${isDark ? 'bg-cyan-500' : 'bg-white'}`} />
+        </button>
+
+        {/* 分隔线 */}
+        <div className={`w-px h-8 ${isDark ? 'bg-blue-800/30' : 'bg-red-500'}`} />
+
+        {/* 用户信息 */}
+        <button className={`flex items-center gap-3 px-3 py-1.5 rounded-lg transition-colors ${
+          isDark ? 'hover:bg-slate-800/50' : 'hover:bg-red-500'
+        }`}>
+          <div className={`w-8 h-8 rounded-full flex items-center justify-center ${
+            isDark
+              ? 'bg-gradient-to-br from-blue-500 to-cyan-400'
+              : 'bg-white'
+          }`}>
+            <User className={`w-4 h-4 ${isDark ? 'text-white' : 'text-red-600'}`} />
+          </div>
+          <div className="text-left">
+            <p className={`text-sm font-medium ${isDark ? 'text-white' : 'text-white'}`}>张策略</p>
+            <p className={`text-xs ${isDark ? 'text-blue-400/60' : 'text-red-200'}`}>策略分析师</p>
+          </div>
+          <ChevronDown className={`w-4 h-4 ${isDark ? 'text-slate-500' : 'text-white'}`} />
+        </button>
+      </div>
+    </header>
+  );
+};
+
+export default Header;
diff --git a/frontend-web/src/styles/globals.css b/frontend-web/src/styles/globals.css
index 3c79e249..8c4e042a 100644
--- a/frontend-web/src/styles/globals.css
+++ b/frontend-web/src/styles/globals.css
@@ -243,7 +243,7 @@
   --workspace-brand: #d92121;
   --workspace-brand-foreground: #ffffff;
   --radius: 0.75rem;
-  --background: oklch(0.985 0.004 95);
+  --background: oklch(1 0 0);
   --foreground: oklch(0.22 0.02 25);
   --card: oklch(1 0.002 95);
   --card-foreground: oklch(0.22 0.02 25);
@@ -277,39 +277,39 @@
 }
 
 .dark {
-  --workspace-brand: #e11d1d;
+  --workspace-brand: #3b82f6;
   --workspace-brand-foreground: #ffffff;
-  --background: oklch(0.22 0.015 25);
-  --foreground: oklch(0.96 0.01 95);
-  --card: oklch(0.26 0.018 25);
-  --card-foreground: oklch(0.96 0.01 95);
-  --popover: oklch(0.24 0.018 25);
-  --popover-foreground: oklch(0.96 0.01 95);
-  --primary: oklch(0.62 0.17 27);
-  --primary-foreground: oklch(0.12 0.02 25);
-  --secondary: oklch(0.32 0.02 25);
-  --secondary-foreground: oklch(0.96 0.01 95);
-  --muted: oklch(0.3 0.02 25);
-  --muted-foreground: oklch(0.72 0.02 95);
-  --accent: oklch(0.34 0.06 25);
-  --accent-foreground: oklch(0.96 0.01 95);
+  --background: oklch(0.208 0.042 264);
+  --foreground: oklch(0.96 0.005 240);
+  --card: oklch(0.265 0.04 260);
+  --card-foreground: oklch(0.96 0.005 240);
+  --popover: oklch(0.245 0.04 262);
+  --popover-foreground: oklch(0.96 0.005 240);
+  --primary: oklch(0.623 0.214 259);
+  --primary-foreground: oklch(0.99 0 0);
+  --secondary: oklch(0.32 0.038 260);
+  --secondary-foreground: oklch(0.96 0.005 240);
+  --muted: oklch(0.30 0.035 260);
+  --muted-foreground: oklch(0.68 0.02 240);
+  --accent: oklch(0.35 0.06 260);
+  --accent-foreground: oklch(0.96 0.005 240);
   --destructive: oklch(0.704 0.191 22.216);
   --border: oklch(1 0 0 / 12%);
   --input: oklch(1 0 0 / 14%);
-  --ring: oklch(0.62 0.17 27 / 0.45);
+  --ring: oklch(0.623 0.214 259 / 0.45);
   --chart-1: oklch(0.488 0.243 264.376);
   --chart-2: oklch(0.696 0.17 162.48);
   --chart-3: oklch(0.769 0.188 70.08);
   --chart-4: oklch(0.627 0.265 303.9);
   --chart-5: oklch(0.645 0.246 16.439);
-  --sidebar: oklch(0.2 0.02 25);
-  --sidebar-foreground: oklch(0.94 0.01 95);
-  --sidebar-primary: oklch(0.62 0.17 27);
+  --sidebar: oklch(0.185 0.04 265);
+  --sidebar-foreground: oklch(0.94 0.005 240);
+  --sidebar-primary: oklch(0.623 0.214 259);
   --sidebar-primary-foreground: oklch(0.99 0 0);
-  --sidebar-accent: oklch(0.3 0.05 25);
-  --sidebar-accent-foreground: oklch(0.96 0.01 95);
+  --sidebar-accent: oklch(0.30 0.055 260);
+  --sidebar-accent-foreground: oklch(0.96 0.005 240);
   --sidebar-border: oklch(1 0 0 / 10%);
-  --sidebar-ring: oklch(0.62 0.17 27 / 0.45);
+  --sidebar-ring: oklch(0.623 0.214 259 / 0.45);
   font-weight: 300;
 }
 
@@ -430,19 +430,27 @@
   }
 
   .workspace-shell {
-    background:
-      radial-gradient(circle at top right, rgb(255 214 214 / 0.72), transparent 18%),
-      linear-gradient(180deg, #fbf7f4 0%, #f6efea 100%);
+    background: #ffffff;
+  }
+
+  .dark .workspace-shell {
+    background: var(--background);
   }
 
   .workspace-panel {
     border: 1px solid #f0d7d0;
-    background: linear-gradient(180deg, rgb(255 253 251 / 0.98), rgb(255 247 244 / 0.98));
+    background: #ffffff;
     box-shadow:
       0 32px 72px -46px rgb(98 63 42 / 0.35),
       0 12px 28px -22px rgb(170 91 75 / 0.24);
   }
 
+  .dark .workspace-panel {
+    border: 1px solid oklch(1 0 0 / 10%);
+    background: var(--card);
+    box-shadow: none;
+  }
+
   .workspace-user-bubble {
     max-width: min(82%, 42rem);
     border: 1px solid rgb(255 255 255 / 0.14);