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diff --git a/src/demos/LayoutDemo.tsx b/src/demos/LayoutDemo.tsx
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+import { useState } from 'react'
+import { Collapsible, CollapsibleGroup } from '@astryxdesign/core/Collapsible'
+import { Grid } from '@astryxdesign/core/Grid'
+import { Heading } from '@astryxdesign/core/Heading'
+import { SelectableCard } from '@astryxdesign/core/SelectableCard'
+import { Text } from '@astryxdesign/core/Text'
+import { VStack } from '@astryxdesign/core/VStack'
+
+const PLANS = [
+  { id: 'basic', name: '基础版', price: '¥9/月', desc: '适合个人项目' },
+  { id: 'pro', name: '专业版', price: '¥29/月', desc: '适合小型团队' },
+  { id: 'team', name: '团队版', price: '¥99/月', desc: '适合协作组织' },
+]
+
+export function LayoutDemo() {
+  const [selected, setSelected] = useState('pro')
+
+  return (
+    <VStack gap={4}>
+      <Grid columns={{ minWidth: 140, max: 3 }} gap={3}>
+        {PLANS.map((plan) => (
+          <SelectableCard
+            key={plan.id}
+            label={plan.name}
+            isSelected={selected === plan.id}
+            onChange={() => setSelected(plan.id)}>
+            <VStack gap={1}>
+              <Heading level={4}>{plan.name}</Heading>
+              <Text type="large" weight="bold">
+                {plan.price}
+              </Text>
+              <Text type="supporting" size="sm">
+                {plan.desc}
+              </Text>
+            </VStack>
+          </SelectableCard>
+        ))}
+      </Grid>
+
+      <CollapsibleGroup type="single" defaultValue="layout">
+        <Collapsible
+          value="layout"
+          trigger={<Text type="label">这个布局是如何组织的？</Text>}>
+          <Text type="body" color="secondary" as="p">
+            外层使用 Grid 负责响应式列数，SelectableCard 负责可选中的卡片语义，Collapsible
+            负责按需展开说明。所有间距都来自同一套 token。
+          </Text>
+        </Collapsible>
+      </CollapsibleGroup>
+    </VStack>
+  )
+}