diff --git a/apps/x/apps/renderer/src/App.css b/apps/x/apps/renderer/src/App.css
index adc0c59f..baf61102 100644
--- a/apps/x/apps/renderer/src/App.css
+++ b/apps/x/apps/renderer/src/App.css
@@ -116,7 +116,7 @@
   --sidebar-foreground: var(--text-color, oklch(0.145 0 0));
   --sidebar-primary: var(--main-color, oklch(0.205 0 0));
   --sidebar-primary-foreground: var(--bg-color, oklch(0.985 0 0));
-  --sidebar-accent: var(--sub-color, oklch(0.97 0 0));
+  --sidebar-accent: var(--sub-color, oklch(0.90 0 0));
   --sidebar-accent-foreground: var(--text-color, oklch(0.205 0 0));
   --sidebar-border: var(--sub-alt-color, oklch(0.922 0 0));
   --sidebar-ring: var(--main-color, oklch(0.708 0 0));
@@ -150,7 +150,7 @@
   --sidebar-foreground: var(--text-color, oklch(0.985 0 0));
   --sidebar-primary: var(--main-color, oklch(0.488 0.243 264.376));
   --sidebar-primary-foreground: var(--bg-color, oklch(0.985 0 0));
-  --sidebar-accent: var(--sub-color, oklch(0.269 0 0));
+  --sidebar-accent: var(--sub-color, oklch(0.35 0 0));
   --sidebar-accent-foreground: var(--text-color, oklch(0.985 0 0));
   --sidebar-border: var(--sub-alt-color, oklch(1 0 0 / 10%));
   --sidebar-ring: var(--main-color, oklch(0.556 0 0));
diff --git a/apps/x/apps/renderer/src/App.tsx b/apps/x/apps/renderer/src/App.tsx
index b25436a9..8d95eb95 100644
--- a/apps/x/apps/renderer/src/App.tsx
+++ b/apps/x/apps/renderer/src/App.tsx
@@ -1124,7 +1124,7 @@ function App() {
             {/* Chat sidebar - shown when viewing files/graph */}
             {isChatSidebarOpen && (selectedPath || isGraphOpen) && (
               <ChatSidebar
-                width={400}
+                defaultWidth={400}
                 onClose={() => setIsChatSidebarOpen(false)}
                 conversation={conversation}
                 currentAssistantMessage={currentAssistantMessage}
diff --git a/apps/x/apps/renderer/src/components/chat-sidebar.tsx b/apps/x/apps/renderer/src/components/chat-sidebar.tsx
index 787ee963..25061a7d 100644
--- a/apps/x/apps/renderer/src/components/chat-sidebar.tsx
+++ b/apps/x/apps/renderer/src/components/chat-sidebar.tsx
@@ -1,6 +1,8 @@
+import { useCallback, useRef, useState } from 'react'
 import { X } from 'lucide-react'
 import type { ChatStatus, LanguageModelUsage, ToolUIPart } from 'ai'
 import { Button } from '@/components/ui/button'
+import { cn } from '@/lib/utils'
 import {
   Conversation,
   ConversationContent,
@@ -105,8 +107,12 @@ const normalizeToolOutput = (output: ToolCall['result'] | undefined, status: Too
   return output
 }
 
+const MIN_WIDTH = 300
+const MAX_WIDTH = 700
+const DEFAULT_WIDTH = 400
+
 interface ChatSidebarProps {
-  width?: number
+  defaultWidth?: number
   onClose: () => void
   conversation: ConversationItem[]
   currentAssistantMessage: string
@@ -121,7 +127,7 @@ interface ChatSidebarProps {
 }
 
 export function ChatSidebar({
-  width = 400,
+  defaultWidth = DEFAULT_WIDTH,
   onClose,
   conversation,
   currentAssistantMessage,
@@ -134,6 +140,33 @@ export function ChatSidebar({
   maxTokens,
   usedTokens,
 }: ChatSidebarProps) {
+  const [width, setWidth] = useState(defaultWidth)
+  const [isResizing, setIsResizing] = useState(false)
+  const startXRef = useRef(0)
+  const startWidthRef = useRef(0)
+
+  const handleMouseDown = useCallback((e: React.MouseEvent) => {
+    e.preventDefault()
+    startXRef.current = e.clientX
+    startWidthRef.current = width
+    setIsResizing(true)
+
+    const handleMouseMove = (e: MouseEvent) => {
+      // Since sidebar is on right, dragging left increases width
+      const delta = startXRef.current - e.clientX
+      const newWidth = Math.min(MAX_WIDTH, Math.max(MIN_WIDTH, startWidthRef.current + delta))
+      setWidth(newWidth)
+    }
+
+    const handleMouseUp = () => {
+      setIsResizing(false)
+      document.removeEventListener('mousemove', handleMouseMove)
+      document.removeEventListener('mouseup', handleMouseUp)
+    }
+
+    document.addEventListener('mousemove', handleMouseMove)
+    document.addEventListener('mouseup', handleMouseUp)
+  }, [width])
   const hasConversation = conversation.length > 0 || currentAssistantMessage || currentReasoning
   const submitStatus: ChatStatus = isProcessing ? 'streaming' : 'ready'
   const canSubmit = Boolean(message.trim()) && !isProcessing
@@ -188,9 +221,19 @@ export function ChatSidebar({
 
   return (
     <div
-      className="flex flex-col border-l border-border bg-background shrink-0"
+      className="relative flex flex-col border-l border-border bg-background shrink-0"
       style={{ width }}
     >
+      {/* Resize handle */}
+      <div
+        onMouseDown={handleMouseDown}
+        className={cn(
+          "absolute inset-y-0 left-0 z-20 w-4 -translate-x-1/2 cursor-col-resize",
+          "after:absolute after:inset-y-0 after:left-1/2 after:w-[2px] after:transition-colors",
+          "hover:after:bg-sidebar-border",
+          isResizing && "after:bg-primary"
+        )}
+      />
       {/* Header */}
       <header className="flex h-12 shrink-0 items-center justify-between border-b border-border px-3">
         <span className="text-sm font-medium">Chat</span>
diff --git a/apps/x/apps/renderer/src/components/sidebar-icon.tsx b/apps/x/apps/renderer/src/components/sidebar-icon.tsx
index 20fbae63..a0b91cbc 100644
--- a/apps/x/apps/renderer/src/components/sidebar-icon.tsx
+++ b/apps/x/apps/renderer/src/components/sidebar-icon.tsx
@@ -7,7 +7,6 @@ import {
   HelpCircle,
   Plug,
   Settings,
-  Ship,
 } from "lucide-react"
 
 import { cn } from "@/lib/utils"
@@ -36,11 +35,6 @@ export function SidebarIcon() {
 
   return (
     <div className="bg-sidebar border-r border-sidebar-border flex h-svh w-14 flex-col items-center py-2 fixed left-0 top-0 z-50 shrink-0">
-      {/* Logo */}
-      <div className="flex h-10 w-10 items-center justify-center rounded-md bg-sidebar-primary text-sidebar-primary-foreground mb-4">
-        <Ship className="size-5" />
-      </div>
-
       {/* Main navigation */}
       <nav className="flex flex-1 flex-col items-center gap-1">
         {navItems.map((item) => (