diff --git a/apps/docs/app/components/preview/ComponentPreview.css b/apps/docs/app/components/preview/ComponentPreview.css
new file mode 100644
index 0000000..9b22306
--- /dev/null
+++ b/apps/docs/app/components/preview/ComponentPreview.css
@@ -0,0 +1,15 @@
+.hui-preview-container {
+  border: 1px solid var(--hui-color-border);
+  border-radius: var(--hui-radius-lg);
+  overflow: hidden;
+  background-color: var(--hui-color-background);
+}
+
+.hui-preview-content {
+  padding: var(--hui-spacing-6);
+}
+
+/* Fumadocs Tabs trigger cursor fix */
+[role="tab"] {
+  cursor: pointer;
+}
diff --git a/apps/docs/app/components/preview/ComponentPreview.tsx b/apps/docs/app/components/preview/ComponentPreview.tsx
new file mode 100644
index 0000000..8f965f1
--- /dev/null
+++ b/apps/docs/app/components/preview/ComponentPreview.tsx
@@ -0,0 +1,30 @@
+'use client';
+
+import { Suspense } from 'react';
+import { demos } from './demo-registry';
+import './ComponentPreview.css';
+
+interface ComponentPreviewProps {
+  name: string;
+}
+
+export function ComponentPreview({ name }: ComponentPreviewProps) {
+  const Demo = demos[name];
+  if (!Demo) {
+    return (
+      <div className="hui-preview-container">
+        <p>Demo &quot;{name}&quot; not found.</p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="hui-preview-container">
+      <div className="hui-root hui-preview-content">
+        <Suspense fallback={<div style={{ padding: '1rem' }}>Loading preview...</div>}>
+          <Demo />
+        </Suspense>
+      </div>
+    </div>
+  );
+}
diff --git a/apps/docs/app/components/preview/demo-registry.ts b/apps/docs/app/components/preview/demo-registry.ts
new file mode 100644
index 0000000..13b0b50
--- /dev/null
+++ b/apps/docs/app/components/preview/demo-registry.ts
@@ -0,0 +1,10 @@
+import { type ComponentType, lazy } from 'react';
+
+export const demos: Record<string, ComponentType> = {
+  'button-variants': lazy(() => import('./demos/button-variants')),
+  'card-demo': lazy(() => import('./demos/card-demo')),
+  'dialog-demo': lazy(() => import('./demos/dialog-demo')),
+  'input-demo': lazy(() => import('./demos/input-demo')),
+  'badge-demo': lazy(() => import('./demos/badge-demo')),
+  'tabs-demo': lazy(() => import('./demos/tabs-demo')),
+};
diff --git a/apps/docs/app/components/preview/demos/badge-demo.tsx b/apps/docs/app/components/preview/demos/badge-demo.tsx
new file mode 100644
index 0000000..b6644b4
--- /dev/null
+++ b/apps/docs/app/components/preview/demos/badge-demo.tsx
@@ -0,0 +1,14 @@
+'use client';
+
+import { Badge } from '@hareru/ui';
+
+export default function BadgeDemo() {
+  return (
+    <div style={{ display: 'flex', flexWrap: 'wrap', gap: '0.5rem' }}>
+      <Badge>Default</Badge>
+      <Badge variant="secondary">Secondary</Badge>
+      <Badge variant="destructive">Destructive</Badge>
+      <Badge variant="outline">Outline</Badge>
+    </div>
+  );
+}
diff --git a/apps/docs/app/components/preview/demos/button-variants.tsx b/apps/docs/app/components/preview/demos/button-variants.tsx
new file mode 100644
index 0000000..fa9b9df
--- /dev/null
+++ b/apps/docs/app/components/preview/demos/button-variants.tsx
@@ -0,0 +1,23 @@
+'use client';
+
+import { Button } from '@hareru/ui';
+
+export default function ButtonVariantsDemo() {
+  return (
+    <div style={{ display: 'flex', flexDirection: 'column', gap: '1rem' }}>
+      <div style={{ display: 'flex', flexWrap: 'wrap', gap: '0.5rem', alignItems: 'center' }}>
+        <Button>Default</Button>
+        <Button variant="secondary">Secondary</Button>
+        <Button variant="destructive">Destructive</Button>
+        <Button variant="outline">Outline</Button>
+        <Button variant="ghost">Ghost</Button>
+        <Button variant="link">Link</Button>
+      </div>
+      <div style={{ display: 'flex', flexWrap: 'wrap', gap: '0.5rem', alignItems: 'center' }}>
+        <Button size="sm">Small</Button>
+        <Button size="md">Medium</Button>
+        <Button size="lg">Large</Button>
+      </div>
+    </div>
+  );
+}
diff --git a/apps/docs/app/components/preview/demos/card-demo.tsx b/apps/docs/app/components/preview/demos/card-demo.tsx
new file mode 100644
index 0000000..9259487
--- /dev/null
+++ b/apps/docs/app/components/preview/demos/card-demo.tsx
@@ -0,0 +1,29 @@
+'use client';
+
+import {
+  Button,
+  Card,
+  CardContent,
+  CardDescription,
+  CardFooter,
+  CardHeader,
+  CardTitle,
+} from '@hareru/ui';
+
+export default function CardDemo() {
+  return (
+    <Card style={{ maxWidth: '24rem' }}>
+      <CardHeader>
+        <CardTitle>Card Title</CardTitle>
+        <CardDescription>Card description with supporting text.</CardDescription>
+      </CardHeader>
+      <CardContent>
+        <p>This is the main content area of the card component.</p>
+      </CardContent>
+      <CardFooter style={{ display: 'flex', gap: '0.5rem' }}>
+        <Button>Save</Button>
+        <Button variant="outline">Cancel</Button>
+      </CardFooter>
+    </Card>
+  );
+}
diff --git a/apps/docs/app/components/preview/demos/dialog-demo.tsx b/apps/docs/app/components/preview/demos/dialog-demo.tsx
new file mode 100644
index 0000000..94f5712
--- /dev/null
+++ b/apps/docs/app/components/preview/demos/dialog-demo.tsx
@@ -0,0 +1,38 @@
+'use client';
+
+import {
+  Button,
+  Dialog,
+  DialogClose,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+  DialogTrigger,
+} from '@hareru/ui';
+
+export default function DialogDemo() {
+  return (
+    <Dialog>
+      <DialogTrigger asChild>
+        <Button variant="outline">Open Dialog</Button>
+      </DialogTrigger>
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>Dialog Title</DialogTitle>
+          <DialogDescription>
+            This is a dialog description. It provides context for the dialog content.
+          </DialogDescription>
+        </DialogHeader>
+        <p>Dialog body content goes here.</p>
+        <DialogFooter>
+          <DialogClose asChild>
+            <Button variant="outline">Cancel</Button>
+          </DialogClose>
+          <Button>Confirm</Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
diff --git a/apps/docs/app/components/preview/demos/input-demo.tsx b/apps/docs/app/components/preview/demos/input-demo.tsx
new file mode 100644
index 0000000..682665d
--- /dev/null
+++ b/apps/docs/app/components/preview/demos/input-demo.tsx
@@ -0,0 +1,18 @@
+'use client';
+
+import { Input, Label } from '@hareru/ui';
+
+export default function InputDemo() {
+  return (
+    <div style={{ display: 'flex', flexDirection: 'column', gap: '1rem', maxWidth: '20rem' }}>
+      <div style={{ display: 'flex', flexDirection: 'column', gap: '0.25rem' }}>
+        <Label htmlFor="email">Email</Label>
+        <Input id="email" type="email" placeholder="you@example.com" />
+      </div>
+      <div style={{ display: 'flex', flexDirection: 'column', gap: '0.25rem' }}>
+        <Label htmlFor="disabled">Disabled</Label>
+        <Input id="disabled" placeholder="Disabled input" disabled />
+      </div>
+    </div>
+  );
+}
diff --git a/apps/docs/app/components/preview/demos/tabs-demo.tsx b/apps/docs/app/components/preview/demos/tabs-demo.tsx
new file mode 100644
index 0000000..eb3d01e
--- /dev/null
+++ b/apps/docs/app/components/preview/demos/tabs-demo.tsx
@@ -0,0 +1,24 @@
+'use client';
+
+import { Tabs, TabsContent, TabsList, TabsTrigger } from '@hareru/ui';
+
+export default function TabsDemo() {
+  return (
+    <Tabs defaultValue="account" style={{ maxWidth: '24rem' }}>
+      <TabsList>
+        <TabsTrigger value="account">Account</TabsTrigger>
+        <TabsTrigger value="password">Password</TabsTrigger>
+        <TabsTrigger value="settings">Settings</TabsTrigger>
+      </TabsList>
+      <TabsContent value="account">
+        <p>Manage your account settings and preferences.</p>
+      </TabsContent>
+      <TabsContent value="password">
+        <p>Change your password and security options.</p>
+      </TabsContent>
+      <TabsContent value="settings">
+        <p>Configure application settings.</p>
+      </TabsContent>
+    </Tabs>
+  );
+}
diff --git a/apps/docs/app/components/preview/index.ts b/apps/docs/app/components/preview/index.ts
new file mode 100644
index 0000000..cc939c2
--- /dev/null
+++ b/apps/docs/app/components/preview/index.ts
@@ -0,0 +1 @@
+export { ComponentPreview } from './ComponentPreview';
diff --git a/apps/docs/app/docs/[[...slug]]/page.tsx b/apps/docs/app/docs/[[...slug]]/page.tsx
index 1c498cc..587768d 100644
--- a/apps/docs/app/docs/[[...slug]]/page.tsx
+++ b/apps/docs/app/docs/[[...slug]]/page.tsx
@@ -1,5 +1,7 @@
+import { ComponentPreview } from '@/app/components/preview';
 import { RegistryA11y, RegistrySlots, RegistryStates } from '@/app/components/registry';
 import { source } from '@/lib/source';
+import { Tab, Tabs } from 'fumadocs-ui/components/tabs';
 import { DocsBody, DocsDescription, DocsPage, DocsTitle } from 'fumadocs-ui/layouts/notebook/page';
 import defaultMdxComponents from 'fumadocs-ui/mdx';
 import { notFound } from 'next/navigation';
@@ -20,7 +22,15 @@ export default async function Page(props: {
       <DocsDescription>{page.data.description}</DocsDescription>
       <DocsBody>
         <MDX
-          components={{ ...defaultMdxComponents, RegistryStates, RegistryA11y, RegistrySlots }}
+          components={{
+            ...defaultMdxComponents,
+            RegistryStates,
+            RegistryA11y,
+            RegistrySlots,
+            ComponentPreview,
+            Tabs,
+            Tab,
+          }}
         />
       </DocsBody>
     </DocsPage>
diff --git a/apps/docs/app/layout.tsx b/apps/docs/app/layout.tsx
index 86319cf..c724cbe 100644
--- a/apps/docs/app/layout.tsx
+++ b/apps/docs/app/layout.tsx
@@ -1,5 +1,8 @@
 import { RootProvider } from 'fumadocs-ui/provider/next';
 import 'fumadocs-ui/style.css';
+import '@hareru/tokens/css';
+import '@hareru/ui/styles/components.layer.css';
+import '@hareru/ui/styles/scope.css';
 import type { ReactNode } from 'react';
 
 export const metadata = {
@@ -20,7 +23,7 @@ export default function RootLayout({ children }: { children: ReactNode }) {
   return (
     <html lang="en" suppressHydrationWarning>
       <body>
-        <RootProvider>{children}</RootProvider>
+        <RootProvider theme={{ attribute: ['class', 'data-theme'] }}>{children}</RootProvider>
       </body>
     </html>
   );
diff --git a/apps/docs/content/docs/components/badge.mdx b/apps/docs/content/docs/components/badge.mdx
index ae1d263..f584a41 100644
--- a/apps/docs/content/docs/components/badge.mdx
+++ b/apps/docs/content/docs/components/badge.mdx
@@ -5,6 +5,24 @@ description: Compact status label with semantic color variants.
 
 **Category:** Data Display / Standalone
 
+## Preview
+
+<Tabs items={['Preview', 'Code']}>
+  <Tab value="Preview">
+    <ComponentPreview name="badge-demo" />
+  </Tab>
+  <Tab value="Code">
+    ```tsx
+    import { Badge } from "@hareru/ui"
+
+    <Badge>Default</Badge>
+    <Badge variant="secondary">Secondary</Badge>
+    <Badge variant="destructive">Destructive</Badge>
+    <Badge variant="outline">Outline</Badge>
+    ```
+  </Tab>
+</Tabs>
+
 ## Import
 
 ```tsx
diff --git a/apps/docs/content/docs/components/button.mdx b/apps/docs/content/docs/components/button.mdx
index 167c62d..796f0f2 100644
--- a/apps/docs/content/docs/components/button.mdx
+++ b/apps/docs/content/docs/components/button.mdx
@@ -5,6 +5,26 @@ description: Interactive button element with variant and size support via CVA.
 
 **Category:** Form / Standalone
 
+## Preview
+
+<Tabs items={['Preview', 'Code']}>
+  <Tab value="Preview">
+    <ComponentPreview name="button-variants" />
+  </Tab>
+  <Tab value="Code">
+    ```tsx
+    import { Button } from "@hareru/ui"
+
+    <Button>Default</Button>
+    <Button variant="secondary">Secondary</Button>
+    <Button variant="destructive">Destructive</Button>
+    <Button variant="outline">Outline</Button>
+    <Button variant="ghost">Ghost</Button>
+    <Button variant="link">Link</Button>
+    ```
+  </Tab>
+</Tabs>
+
 ## Import
 
 ```tsx
diff --git a/apps/docs/content/docs/components/card.mdx b/apps/docs/content/docs/components/card.mdx
index 56dc3cf..b0c36a0 100644
--- a/apps/docs/content/docs/components/card.mdx
+++ b/apps/docs/content/docs/components/card.mdx
@@ -5,6 +5,33 @@ description: Semantic content container using article, header, and footer HTML e
 
 **Category:** Layout / Composite
 
+## Preview
+
+<Tabs items={['Preview', 'Code']}>
+  <Tab value="Preview">
+    <ComponentPreview name="card-demo" />
+  </Tab>
+  <Tab value="Code">
+    ```tsx
+    import { Card, CardHeader, CardTitle, CardDescription, CardContent, CardFooter, Button } from "@hareru/ui"
+
+    <Card>
+      <CardHeader>
+        <CardTitle>Card Title</CardTitle>
+        <CardDescription>Card description with supporting text.</CardDescription>
+      </CardHeader>
+      <CardContent>
+        <p>Main content area of the card.</p>
+      </CardContent>
+      <CardFooter>
+        <Button>Save</Button>
+        <Button variant="outline">Cancel</Button>
+      </CardFooter>
+    </Card>
+    ```
+  </Tab>
+</Tabs>
+
 ## Import
 
 ```tsx
diff --git a/apps/docs/content/docs/components/dialog.mdx b/apps/docs/content/docs/components/dialog.mdx
index cc0b87c..479d9a6 100644
--- a/apps/docs/content/docs/components/dialog.mdx
+++ b/apps/docs/content/docs/components/dialog.mdx
@@ -7,6 +7,36 @@ description: Accessible modal dialog built on Base UI Dialog primitives.
 
 **Dependency:** `@base-ui-components/react/dialog`
 
+## Preview
+
+<Tabs items={['Preview', 'Code']}>
+  <Tab value="Preview">
+    <ComponentPreview name="dialog-demo" />
+  </Tab>
+  <Tab value="Code">
+    ```tsx
+    import { Dialog, DialogTrigger, DialogContent, DialogHeader, DialogTitle, DialogDescription, DialogFooter, DialogClose, Button } from "@hareru/ui"
+
+    <Dialog>
+      <DialogTrigger asChild>
+        <Button variant="outline">Open Dialog</Button>
+      </DialogTrigger>
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>Dialog Title</DialogTitle>
+          <DialogDescription>Dialog description text.</DialogDescription>
+        </DialogHeader>
+        <p>Dialog body content.</p>
+        <DialogFooter>
+          <DialogClose asChild><Button variant="outline">Cancel</Button></DialogClose>
+          <Button>Confirm</Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+    ```
+  </Tab>
+</Tabs>
+
 ## Import
 
 ```tsx
diff --git a/apps/docs/content/docs/components/input.mdx b/apps/docs/content/docs/components/input.mdx
index 397ddbf..ac94919 100644
--- a/apps/docs/content/docs/components/input.mdx
+++ b/apps/docs/content/docs/components/input.mdx
@@ -5,6 +5,25 @@ description: Single-line text input with error state and file input support.
 
 **Category:** Form / Standalone
 
+## Preview
+
+<Tabs items={['Preview', 'Code']}>
+  <Tab value="Preview">
+    <ComponentPreview name="input-demo" />
+  </Tab>
+  <Tab value="Code">
+    ```tsx
+    import { Input, Label } from "@hareru/ui"
+
+    <Label htmlFor="email">Email</Label>
+    <Input id="email" type="email" placeholder="you@example.com" />
+
+    <Label htmlFor="disabled">Disabled</Label>
+    <Input id="disabled" placeholder="Disabled input" disabled />
+    ```
+  </Tab>
+</Tabs>
+
 ## Import
 
 ```tsx
diff --git a/apps/docs/content/docs/components/tabs.mdx b/apps/docs/content/docs/components/tabs.mdx
index 706d111..36e7aca 100644
--- a/apps/docs/content/docs/components/tabs.mdx
+++ b/apps/docs/content/docs/components/tabs.mdx
@@ -7,6 +7,30 @@ description: Accessible tabbed interface for switching between related content p
 
 **Dependency:** `@base-ui-components/react/tabs`
 
+## Preview
+
+<Tabs items={['Preview', 'Code']}>
+  <Tab value="Preview">
+    <ComponentPreview name="tabs-demo" />
+  </Tab>
+  <Tab value="Code">
+    ```tsx
+    import { Tabs, TabsList, TabsTrigger, TabsContent } from "@hareru/ui"
+
+    <Tabs defaultValue="account">
+      <TabsList>
+        <TabsTrigger value="account">Account</TabsTrigger>
+        <TabsTrigger value="password">Password</TabsTrigger>
+        <TabsTrigger value="settings">Settings</TabsTrigger>
+      </TabsList>
+      <TabsContent value="account">Account settings content.</TabsContent>
+      <TabsContent value="password">Password settings content.</TabsContent>
+      <TabsContent value="settings">Application settings content.</TabsContent>
+    </Tabs>
+    ```
+  </Tab>
+</Tabs>
+
 ## Import
 
 ```tsx