diff --git a/packages/ui/src/components/index.ts b/packages/ui/src/components/index.ts
index 7381afc1ba..c8ed30ea0a 100644
--- a/packages/ui/src/components/index.ts
+++ b/packages/ui/src/components/index.ts
@@ -74,4 +74,4 @@ export * from './primitives/radioGroup'
 export * from './primitives/select'
 export * from './primitives/shadcn-io/dropzone'
 export * from './primitives/tabs'
-export * from './primitives/textarea'
+export * as Textarea from './primitives/textarea'
diff --git a/packages/ui/src/components/primitives/input-group.tsx b/packages/ui/src/components/primitives/input-group.tsx
index 8c9ff10fac..9c27456b34 100644
--- a/packages/ui/src/components/primitives/input-group.tsx
+++ b/packages/ui/src/components/primitives/input-group.tsx
@@ -1,7 +1,8 @@
 import { Button } from '@cherrystudio/ui/components/primitives/button'
 import type { InputProps } from '@cherrystudio/ui/components/primitives/input'
 import { Input } from '@cherrystudio/ui/components/primitives/input'
-import { Textarea } from '@cherrystudio/ui/components/primitives/textarea'
+import type { TextareaInputProps } from '@cherrystudio/ui/components/primitives/textarea'
+import * as Textarea from '@cherrystudio/ui/components/primitives/textarea'
 import { cn } from '@cherrystudio/ui/utils/index'
 import { cva, type VariantProps } from 'class-variance-authority'
 import * as React from 'react'
@@ -131,9 +132,9 @@ function InputGroupInput({ className, ...props }: InputProps) {
   )
 }
 
-function InputGroupTextarea({ className, ...props }: React.ComponentProps<'textarea'>) {
+function InputGroupTextarea({ className, ...props }: TextareaInputProps) {
   return (
-    <Textarea
+    <Textarea.Input
       data-slot="input-group-control"
       className={cn(
         'flex-1 resize-none rounded-none border-0 bg-transparent py-3 shadow-none focus-visible:ring-0 dark:bg-transparent',
diff --git a/packages/ui/src/components/primitives/textarea.tsx b/packages/ui/src/components/primitives/textarea.tsx
index fe9d943b11..5bc749d7ac 100644
--- a/packages/ui/src/components/primitives/textarea.tsx
+++ b/packages/ui/src/components/primitives/textarea.tsx
@@ -1,17 +1,116 @@
-import { cn } from '@cherrystudio/ui/utils'
+import { cn } from '@cherrystudio/ui/utils/index'
+import { composeEventHandlers } from '@radix-ui/primitive'
+import { useCallbackRef } from '@radix-ui/react-use-callback-ref'
+import { useControllableState } from '@radix-ui/react-use-controllable-state'
+import { cva } from 'class-variance-authority'
 import * as React from 'react'
 
-function Textarea({ className, ...props }: React.ComponentProps<'textarea'>) {
+/* -------------------------------------------------------------------------------------------------
+ * Variants
+ * -----------------------------------------------------------------------------------------------*/
+
+const textareaVariants = cva(
+  cn(
+    'flex field-sizing-content min-h-16 w-full border bg-transparent px-4 py-3 text-lg shadow-xs transition-[color,box-shadow] outline-none resize-y',
+    'rounded-xs',
+    'border-input text-foreground placeholder:text-foreground-secondary',
+    'focus-visible:border-primary focus-visible:ring-ring focus-visible:ring-[3px]',
+    'disabled:cursor-not-allowed disabled:opacity-50',
+    'md:text-sm'
+  ),
+  {
+    variants: {
+      hasError: {
+        true: 'aria-invalid:border-destructive aria-invalid:ring-destructive/20',
+        false: ''
+      }
+    },
+    defaultVariants: {
+      hasError: false
+    }
+  }
+)
+
+/* -------------------------------------------------------------------------------------------------
+ * TextareaInput
+ * -----------------------------------------------------------------------------------------------*/
+
+const INPUT_NAME = 'TextareaInput'
+
+interface TextareaInputProps extends Omit<React.ComponentPropsWithoutRef<'textarea'>, 'value' | 'defaultValue'> {
+  value?: string
+  defaultValue?: string
+  onValueChange?: (value: string) => void
+  hasError?: boolean
+  ref?: React.Ref<HTMLTextAreaElement>
+}
+
+function TextareaInput({
+  value: valueProp,
+  defaultValue,
+  onValueChange,
+  hasError = false,
+  className,
+  ref,
+  ...props
+}: TextareaInputProps) {
+  const [value = '', setValue] = useControllableState({
+    prop: valueProp,
+    defaultProp: defaultValue ?? '',
+    onChange: onValueChange
+  })
+
+  const handleChange = useCallbackRef((event: React.ChangeEvent<HTMLTextAreaElement>) => {
+    const newValue = event.target.value
+    if (props.maxLength && newValue.length > props.maxLength) {
+      return
+    }
+    setValue(newValue)
+  })
+
   return (
     <textarea
-      data-slot="textarea"
-      className={cn(
-        'border-input placeholder:text-muted-foreground focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:bg-input/30 flex field-sizing-content min-h-16 w-full rounded-md border bg-transparent px-3 py-2 text-base shadow-xs transition-[color,box-shadow] outline-none focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50 md:text-sm',
-        className
-      )}
+      data-slot="textarea-input"
       {...props}
+      ref={ref}
+      value={value}
+      onChange={composeEventHandlers(props.onChange, handleChange)}
+      aria-invalid={hasError}
+      className={cn(textareaVariants({ hasError }), className)}
     />
   )
 }
 
-export { Textarea }
+TextareaInput.displayName = INPUT_NAME
+
+/* -------------------------------------------------------------------------------------------------
+ * TextareaCharCount
+ * -----------------------------------------------------------------------------------------------*/
+
+const CHAR_COUNT_NAME = 'TextareaCharCount'
+
+interface TextareaCharCountProps extends React.ComponentPropsWithoutRef<'div'> {
+  value?: string
+  maxLength?: number
+}
+
+function TextareaCharCount({ value = '', maxLength, className, ...props }: TextareaCharCountProps) {
+  return (
+    <div
+      data-slot="textarea-char-count"
+      {...props}
+      className={cn('absolute bottom-2 right-2 text-xs text-muted-foreground', className)}>
+      {value.length}/{maxLength}
+    </div>
+  )
+}
+
+TextareaCharCount.displayName = CHAR_COUNT_NAME
+
+/* ---------------------------------------------------------------------------------------------- */
+
+const Input = TextareaInput
+const CharCount = TextareaCharCount
+
+export { CharCount, Input }
+export type { TextareaCharCountProps, TextareaInputProps }
diff --git a/packages/ui/stories/components/primitives/Textarea.stories.tsx b/packages/ui/stories/components/primitives/Textarea.stories.tsx
new file mode 100644
index 0000000000..d8110e0830
--- /dev/null
+++ b/packages/ui/stories/components/primitives/Textarea.stories.tsx
@@ -0,0 +1,418 @@
+import type { Meta, StoryObj } from '@storybook/react'
+import { useState } from 'react'
+
+import * as Textarea from '../../../src/components/primitives/textarea'
+
+const meta: Meta<typeof Textarea.Input> = {
+  title: 'Components/Primitives/Textarea',
+  component: Textarea.Input,
+  parameters: {
+    layout: 'centered',
+    docs: {
+      description: {
+        component:
+          'A composable multi-line text input built with Radix primitives. Supports controlled/uncontrolled modes, auto-resize (via field-sizing-content), character counting, and error states.'
+      }
+    }
+  },
+  tags: ['autodocs']
+}
+
+export default meta
+type Story = StoryObj<typeof meta>
+
+// Basic Usage
+export const Basic: Story = {
+  render: () => (
+    <div className="flex w-full flex-col gap-2 w-[400px]">
+      <Textarea.Input placeholder="Type your message here..." />
+    </div>
+  )
+}
+
+// With Label
+export const WithLabel: Story = {
+  render: () => (
+    <div className="flex w-full flex-col gap-2 w-[400px]">
+      <div className="text-lg font-bold leading-[22px]">Description</div>
+      <Textarea.Input placeholder="Tell us about yourself..." />
+    </div>
+  )
+}
+
+// Required Field
+export const RequiredField: Story = {
+  render: () => (
+    <div className="flex w-full flex-col gap-2 w-[400px]">
+      <div className="text-lg font-bold leading-[22px]">
+        <span className="text-destructive mr-1">*</span>Bio
+      </div>
+      <Textarea.Input placeholder="This field is required..." />
+    </div>
+  )
+}
+
+// With Caption
+export const WithCaption: Story = {
+  render: () => (
+    <div className="flex w-full flex-col gap-2 w-[400px]">
+      <div className="text-lg font-bold leading-[22px]">Comments</div>
+      <Textarea.Input placeholder="Enter your comments..." />
+      <div className="text-sm flex items-center gap-1.5 leading-4 text-foreground-muted">
+        Please provide detailed feedback
+      </div>
+    </div>
+  )
+}
+
+// Error State
+export const ErrorState: Story = {
+  render: () => (
+    <div className="flex w-full flex-col gap-2 w-[400px]">
+      <div className="text-lg font-bold leading-[22px]">Message</div>
+      <Textarea.Input placeholder="Enter your message..." hasError />
+      <div className="text-sm flex items-center gap-1.5 leading-4 text-destructive">
+        <svg
+          xmlns="http://www.w3.org/2000/svg"
+          width="16"
+          height="16"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          strokeWidth="2"
+          strokeLinecap="round"
+          strokeLinejoin="round"
+          className="shrink-0">
+          <path d="m21.73 18-8-14a2 2 0 0 0-3.48 0l-8 14A2 2 0 0 0 4 21h16a2 2 0 0 0 1.73-3Z" />
+          <path d="M12 9v4" />
+          <path d="M12 17h.01" />
+        </svg>
+        <span>This field cannot be empty</span>
+      </div>
+    </div>
+  )
+}
+
+// With Character Count
+export const WithCharacterCount: Story = {
+  render: function WithCharacterCountExample() {
+    const [value, setValue] = useState('')
+
+    return (
+      <div className="flex w-full flex-col gap-2 w-[400px]">
+        <div className="text-lg font-bold leading-[22px]">Tweet</div>
+        <div className="relative">
+          <Textarea.Input value={value} onValueChange={setValue} maxLength={280} placeholder="What's happening?" />
+          <Textarea.CharCount value={value} maxLength={280} />
+        </div>
+        <div className="text-sm flex items-center gap-1.5 leading-4 text-foreground-muted">Maximum 280 characters</div>
+      </div>
+    )
+  }
+}
+
+// Auto Resize (built-in via field-sizing-content)
+export const AutoResize: Story = {
+  render: function AutoResizeExample() {
+    const [value, setValue] = useState('')
+
+    return (
+      <div className="flex w-full flex-col gap-2 w-[400px]">
+        <div className="text-lg font-bold leading-[22px]">Auto-resizing Textarea</div>
+        <Textarea.Input value={value} onValueChange={setValue} placeholder="This textarea grows with your content..." />
+        <div className="text-sm flex items-center gap-1.5 leading-4 text-foreground-muted">
+          Try typing multiple lines
+        </div>
+      </div>
+    )
+  }
+}
+
+// Disabled State
+export const Disabled: Story = {
+  render: () => (
+    <div className="flex w-full flex-col gap-2 w-[400px]">
+      <div className="text-lg font-bold leading-[22px] cursor-not-allowed opacity-70">Disabled Field</div>
+      <Textarea.Input defaultValue="This textarea is disabled" disabled />
+    </div>
+  )
+}
+
+// Controlled
+export const Controlled: Story = {
+  render: function ControlledExample() {
+    const [value, setValue] = useState('')
+
+    return (
+      <div className="flex flex-col gap-4">
+        <div className="flex w-full flex-col gap-2 w-[400px]">
+          <div className="text-lg font-bold leading-[22px]">Controlled Textarea</div>
+          <Textarea.Input value={value} onValueChange={setValue} placeholder="Type something..." />
+        </div>
+
+        <div className="w-[400px] text-sm text-muted-foreground">
+          <div className="rounded-md border border-border bg-muted p-3">
+            <div className="mb-1 font-medium">Current value:</div>
+            <pre className="text-xs">{value || '(empty)'}</pre>
+            <div className="mt-2 text-xs">Characters: {value.length}</div>
+          </div>
+        </div>
+      </div>
+    )
+  }
+}
+
+// All States
+export const AllStates: Story = {
+  render: function AllStatesExample() {
+    const [value1, setValue1] = useState('')
+    const [value2, setValue2] = useState('This textarea has some content')
+    const [value4, setValue4] = useState('')
+
+    return (
+      <div className="flex flex-col gap-6">
+        <div>
+          <p className="mb-2 text-sm font-semibold text-muted-foreground">Default State</p>
+          <div className="flex w-full flex-col gap-2 w-[400px]">
+            <div className="text-lg font-bold leading-[22px]">Default</div>
+            <Textarea.Input value={value1} onValueChange={setValue1} placeholder="Enter text..." />
+          </div>
+        </div>
+
+        <div>
+          <p className="mb-2 text-sm font-semibold text-muted-foreground">Filled State</p>
+          <div className="flex w-full flex-col gap-2 w-[400px]">
+            <div className="text-lg font-bold leading-[22px]">Filled</div>
+            <Textarea.Input value={value2} onValueChange={setValue2} />
+          </div>
+        </div>
+
+        <div>
+          <p className="mb-2 text-sm font-semibold text-muted-foreground">Disabled State</p>
+          <div className="flex w-full flex-col gap-2 w-[400px]">
+            <div className="text-lg font-bold leading-[22px] cursor-not-allowed opacity-70">Disabled</div>
+            <Textarea.Input defaultValue="Disabled textarea with content" disabled />
+          </div>
+        </div>
+
+        <div>
+          <p className="mb-2 text-sm font-semibold text-muted-foreground">Error State</p>
+          <div className="flex w-full flex-col gap-2 w-[400px]">
+            <div className="text-lg font-bold leading-[22px]">Error</div>
+            <Textarea.Input value={value4} onValueChange={setValue4} hasError />
+            <div className="text-sm flex items-center gap-1.5 leading-4 text-destructive">
+              <svg
+                xmlns="http://www.w3.org/2000/svg"
+                width="16"
+                height="16"
+                viewBox="0 0 24 24"
+                fill="none"
+                stroke="currentColor"
+                strokeWidth="2"
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                className="shrink-0">
+                <path d="m21.73 18-8-14a2 2 0 0 0-3.48 0l-8 14A2 2 0 0 0 4 21h16a2 2 0 0 0 1.73-3Z" />
+                <path d="M12 9v4" />
+                <path d="M12 17h.01" />
+              </svg>
+              <span>This field is required</span>
+            </div>
+          </div>
+        </div>
+
+        <div>
+          <p className="mb-2 text-sm font-semibold text-muted-foreground">Focus State (click to focus)</p>
+          <div className="flex w-full flex-col gap-2 w-[400px]">
+            <div className="text-lg font-bold leading-[22px]">Focus</div>
+            <Textarea.Input placeholder="Click to see focus state" />
+          </div>
+        </div>
+      </div>
+    )
+  }
+}
+
+// Real World Examples
+export const RealWorldExamples: Story = {
+  render: function RealWorldExample() {
+    const [tweet, setTweet] = useState('')
+    const [feedback, setFeedback] = useState('')
+    const [message, setMessage] = useState('')
+
+    const tweetError = tweet.length > 280 ? 'Tweet is too long' : undefined
+    const messageError =
+      message.length > 0 && message.length < 10 ? 'Message must be at least 10 characters' : undefined
+
+    return (
+      <div className="flex flex-col gap-8">
+        {/* Tweet Composer */}
+        <div>
+          <h3 className="mb-3 text-sm font-semibold">Tweet Composer</h3>
+          <div className="flex w-full flex-col gap-2 w-[500px]">
+            <div className="text-lg font-bold leading-[22px]">What's happening?</div>
+            <div className="relative">
+              <Textarea.Input
+                value={tweet}
+                onValueChange={setTweet}
+                maxLength={280}
+                placeholder="Share your thoughts..."
+                hasError={!!tweetError}
+              />
+              <Textarea.CharCount value={tweet} maxLength={280} />
+            </div>
+            {tweetError && (
+              <div className="text-sm flex items-center gap-1.5 leading-4 text-destructive">
+                <svg
+                  xmlns="http://www.w3.org/2000/svg"
+                  width="16"
+                  height="16"
+                  viewBox="0 0 24 24"
+                  fill="none"
+                  stroke="currentColor"
+                  strokeWidth="2"
+                  strokeLinecap="round"
+                  strokeLinejoin="round"
+                  className="shrink-0">
+                  <path d="m21.73 18-8-14a2 2 0 0 0-3.48 0l-8 14A2 2 0 0 0 4 21h16a2 2 0 0 0 1.73-3Z" />
+                  <path d="M12 9v4" />
+                  <path d="M12 17h.01" />
+                </svg>
+                <span>{tweetError}</span>
+              </div>
+            )}
+          </div>
+        </div>
+
+        {/* Feedback Form */}
+        <div>
+          <h3 className="mb-3 text-sm font-semibold">User Feedback</h3>
+          <div className="flex w-full flex-col gap-2 w-[500px]">
+            <div className="text-lg font-bold leading-[22px]">
+              <span className="text-destructive mr-1">*</span>Feedback
+            </div>
+            <Textarea.Input
+              value={feedback}
+              onValueChange={setFeedback}
+              placeholder="Please share your thoughts..."
+              rows={4}
+            />
+            <div className="text-sm flex items-center gap-1.5 leading-4 text-foreground-muted">
+              Your feedback helps us improve
+            </div>
+          </div>
+        </div>
+
+        {/* Contact Form */}
+        <div>
+          <h3 className="mb-3 text-sm font-semibold">Contact Us</h3>
+          <div className="flex w-full flex-col gap-2 w-[500px]">
+            <div className="text-lg font-bold leading-[22px]">
+              <span className="text-destructive mr-1">*</span>Message
+            </div>
+            <Textarea.Input
+              value={message}
+              onValueChange={setMessage}
+              placeholder="How can we help you?"
+              rows={6}
+              hasError={!!messageError}
+            />
+            {messageError ? (
+              <div className="text-sm flex items-center gap-1.5 leading-4 text-destructive">
+                <svg
+                  xmlns="http://www.w3.org/2000/svg"
+                  width="16"
+                  height="16"
+                  viewBox="0 0 24 24"
+                  fill="none"
+                  stroke="currentColor"
+                  strokeWidth="2"
+                  strokeLinecap="round"
+                  strokeLinejoin="round"
+                  className="shrink-0">
+                  <path d="m21.73 18-8-14a2 2 0 0 0-3.48 0l-8 14A2 2 0 0 0 4 21h16a2 2 0 0 0 1.73-3Z" />
+                  <path d="M12 9v4" />
+                  <path d="M12 17h.01" />
+                </svg>
+                <span>{messageError}</span>
+              </div>
+            ) : (
+              <div className="text-sm flex items-center gap-1.5 leading-4 text-foreground-muted">
+                Minimum 10 characters required
+              </div>
+            )}
+          </div>
+        </div>
+      </div>
+    )
+  }
+}
+
+// Dark Mode
+export const DarkMode: Story = {
+  render: () => (
+    <div className="dark rounded-lg bg-background p-8">
+      <div className="flex flex-col gap-6">
+        <div className="flex w-full flex-col gap-2 w-[400px]">
+          <div className="text-lg font-bold leading-[22px]">Default (Dark)</div>
+          <Textarea.Input placeholder="Dark mode textarea..." />
+        </div>
+
+        <div className="flex w-full flex-col gap-2 w-[400px]">
+          <div className="text-lg font-bold leading-[22px]">With Content (Dark)</div>
+          <Textarea.Input defaultValue="This is some content in dark mode" />
+        </div>
+
+        <div className="flex w-full flex-col gap-2 w-[400px]">
+          <div className="text-lg font-bold leading-[22px]">Error (Dark)</div>
+          <Textarea.Input hasError />
+          <div className="text-sm flex items-center gap-1.5 leading-4 text-destructive">
+            <svg
+              xmlns="http://www.w3.org/2000/svg"
+              width="16"
+              height="16"
+              viewBox="0 0 24 24"
+              fill="none"
+              stroke="currentColor"
+              strokeWidth="2"
+              strokeLinecap="round"
+              strokeLinejoin="round"
+              className="shrink-0">
+              <path d="m21.73 18-8-14a2 2 0 0 0-3.48 0l-8 14A2 2 0 0 0 4 21h16a2 2 0 0 0 1.73-3Z" />
+              <path d="M12 9v4" />
+              <path d="M12 17h.01" />
+            </svg>
+            <span>Error in dark mode</span>
+          </div>
+        </div>
+
+        <div className="flex w-full flex-col gap-2 w-[400px]">
+          <div className="text-lg font-bold leading-[22px] cursor-not-allowed opacity-70">Disabled (Dark)</div>
+          <Textarea.Input defaultValue="Disabled in dark mode" disabled />
+        </div>
+      </div>
+    </div>
+  )
+}
+
+// Composition Example
+export const CompositionExample: Story = {
+  render: function CompositionExampleRender() {
+    const [bio, setBio] = useState('')
+
+    return (
+      <div className="flex w-full flex-col gap-2 w-[500px]">
+        <div className="text-lg font-bold leading-[22px]">
+          <span className="text-destructive mr-1">*</span>Profile Bio
+        </div>
+        <div className="relative">
+          <Textarea.Input value={bio} onValueChange={setBio} placeholder="Tell us about yourself..." maxLength={500} />
+          <Textarea.CharCount value={bio} maxLength={500} />
+        </div>
+        <div className="text-sm flex items-center gap-1.5 leading-4 text-foreground-muted">
+          This will be displayed on your profile (max 500 characters)
+        </div>
+      </div>
+    )
+  }
+}