diff --git a/packages/library/src/components/index.ts b/packages/library/src/components/index.ts
index e6f05a2..55c4ad0 100644
--- a/packages/library/src/components/index.ts
+++ b/packages/library/src/components/index.ts
@@ -9,7 +9,8 @@ export { Badge, badgeVariants } from './ui/badge'
 export { Checkbox } from './ui/checkbox'
 export { CheckboxGroup } from './ui/checkbox-group'
 export { RadioGroup, RadioGroupItem } from './ui/radio-group'
-export { Card, CardHeader, CardTitle, CardDescription, CardContent, CardFooter, CardAction } from './ui/card'
+export { Card, CardHeader, CardTitle, CardDescription, CardContent, CardFooter, CardAction, cardVariants } from './ui/card'
+export type { CardVariants } from './ui/card'
 export { Alert, AlertTitle, AlertDescription, AlertAction, alertVariants } from './ui/alert'
 export {
   Select,
diff --git a/packages/library/src/components/ui/card/Card.vue b/packages/library/src/components/ui/card/Card.vue
index 3d8af31..dc4d1de 100644
--- a/packages/library/src/components/ui/card/Card.vue
+++ b/packages/library/src/components/ui/card/Card.vue
@@ -1,10 +1,12 @@
 <script setup lang="ts">
 import type { HTMLAttributes } from "vue"
+import type { CardVariants } from "."
 import { cn } from "@/lib/utils"
+import { cardVariants } from "."
 
 const props = withDefaults(defineProps<{
   class?: HTMLAttributes["class"]
-  size?: "default" | "sm"
+  size?: CardVariants["size"]
 }>(), {
   size: "default",
 })
@@ -14,7 +16,7 @@ const props = withDefaults(defineProps<{
   <div
     data-slot="card"
     :data-size="size"
-    :class="cn('border border-border bg-card text-card-foreground gap-4 overflow-hidden rounded-xl py-4 text-sm shadow-md has-data-[slot=card-footer]:pb-0 has-[>img:first-child]:pt-0 data-[size=sm]:gap-3 data-[size=sm]:py-3 data-[size=sm]:has-data-[slot=card-footer]:pb-0 *:[img:first-child]:rounded-t-xl *:[img:last-child]:rounded-b-xl group/card flex flex-col', props.class)"
+    :class="cn(cardVariants({ size }), props.class)"
   >
     <slot />
   </div>
diff --git a/packages/library/src/components/ui/card/CardFooter.vue b/packages/library/src/components/ui/card/CardFooter.vue
index 46bf012..d5e7be9 100644
--- a/packages/library/src/components/ui/card/CardFooter.vue
+++ b/packages/library/src/components/ui/card/CardFooter.vue
@@ -10,7 +10,7 @@ const props = defineProps<{
 <template>
   <div
     data-slot="card-footer"
-    :class="cn('bg-muted/50 rounded-b-xl border-t p-4 group-data-[size=sm]/card:p-3 flex items-center', props.class)"
+    :class="cn('bg-muted/50 rounded-b-xl border-t p-4 group-data-[size=sm]/card:p-3 flex items-center justify-end gap-2', props.class)"
   >
     <slot />
   </div>
diff --git a/packages/library/src/components/ui/card/index.ts b/packages/library/src/components/ui/card/index.ts
index 1627758..26c3f9a 100644
--- a/packages/library/src/components/ui/card/index.ts
+++ b/packages/library/src/components/ui/card/index.ts
@@ -1,3 +1,6 @@
+import type { VariantProps } from 'class-variance-authority'
+import { cva } from 'class-variance-authority'
+
 export { default as Card } from "./Card.vue"
 export { default as CardAction } from "./CardAction.vue"
 export { default as CardContent } from "./CardContent.vue"
@@ -5,3 +8,19 @@ export { default as CardDescription } from "./CardDescription.vue"
 export { default as CardFooter } from "./CardFooter.vue"
 export { default as CardHeader } from "./CardHeader.vue"
 export { default as CardTitle } from "./CardTitle.vue"
+
+export const cardVariants = cva(
+  'group/card flex flex-col gap-4 overflow-hidden rounded-xl border border-border bg-card py-4 text-sm text-card-foreground shadow-md has-data-[slot=card-footer]:pb-0 has-[>img:first-child]:pt-0 *:[img:first-child]:rounded-t-xl *:[img:last-child]:rounded-b-xl',
+  {
+    variants: {
+      size: {
+        default: '',
+        sm: 'gap-3 py-3',
+      },
+    },
+    defaultVariants: {
+      size: 'default',
+    },
+  },
+)
+export type CardVariants = VariantProps<typeof cardVariants>
diff --git a/packages/library/src/lib/index.ts b/packages/library/src/lib/index.ts
index 10005db..6669cb8 100644
--- a/packages/library/src/lib/index.ts
+++ b/packages/library/src/lib/index.ts
@@ -19,6 +19,7 @@ import {
   CardContent,
   CardFooter,
   CardAction,
+  cardVariants,
   Alert,
   AlertTitle,
   AlertDescription,
@@ -63,6 +64,7 @@ export {
   CardContent,
   CardFooter,
   CardAction,
+  cardVariants,
   Alert,
   AlertTitle,
   AlertDescription,
diff --git a/packages/library/src/lib/use-dismissable-layer.ts b/packages/library/src/lib/use-dismissable-layer.ts
index b89036f..56f7334 100644
--- a/packages/library/src/lib/use-dismissable-layer.ts
+++ b/packages/library/src/lib/use-dismissable-layer.ts
@@ -6,18 +6,32 @@ export interface DismissableLayerOptions {
   onPointerDownOutside?: (event: PointerEvent) => void
 }
 
+// Stack of currently-active layers (dialogs, popovers, etc.), bottom to top.
+// Only the topmost layer reacts to Escape/outside-pointerdown, so opening a
+// nested layer (e.g. a dialog on top of another dialog) can't dismiss layers
+// beneath it.
+const layerStack: symbol[] = []
+
 export function useDismissableLayer(
   containerRef: Ref<HTMLElement | null>,
   active: Ref<boolean>,
   options: DismissableLayerOptions,
 ) {
+  const layerId = Symbol('dismissable-layer')
+
+  function isTopmost() {
+    return layerStack[layerStack.length - 1] === layerId
+  }
+
   function handleKeydown(event: KeyboardEvent) {
     if (event.key !== 'Escape') return
+    if (!isTopmost()) return
     event.preventDefault()
     options.onDismiss()
   }
 
   function handlePointerDown(event: PointerEvent) {
+    if (!isTopmost()) return
     const container = containerRef.value
     if (!container) return
     if (container.contains(event.target as Node)) return
@@ -28,11 +42,14 @@ export function useDismissableLayer(
   }
 
   function attach() {
+    layerStack.push(layerId)
     document.addEventListener('keydown', handleKeydown)
     document.addEventListener('pointerdown', handlePointerDown)
   }
 
   function detach() {
+    const index = layerStack.indexOf(layerId)
+    if (index !== -1) layerStack.splice(index, 1)
     document.removeEventListener('keydown', handleKeydown)
     document.removeEventListener('pointerdown', handlePointerDown)
   }
diff --git a/packages/library/tests/Card.spec.ts b/packages/library/tests/Card.spec.ts
index c51fb16..725f88f 100644
--- a/packages/library/tests/Card.spec.ts
+++ b/packages/library/tests/Card.spec.ts
@@ -29,4 +29,12 @@ describe('Card', () => {
     const wrapper = mount(Card)
     expect(wrapper.attributes('data-slot')).toBe('card')
   })
+
+  it('resolves size classes through cva instead of data-[size=] selectors', () => {
+    const wrapper = mount(Card, { props: { size: 'sm' } })
+    const classes = wrapper.classes()
+    expect(classes).toContain('gap-3')
+    expect(classes).toContain('py-3')
+    expect(classes.some((c) => c.includes('data-[size='))).toBe(false)
+  })
 })
diff --git a/packages/library/tests/use-dismissable-layer.spec.ts b/packages/library/tests/use-dismissable-layer.spec.ts
index 90551a5..a87011b 100644
--- a/packages/library/tests/use-dismissable-layer.spec.ts
+++ b/packages/library/tests/use-dismissable-layer.spec.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect, vi, afterEach } from 'vitest'
-import { ref } from 'vue'
+import { nextTick, ref } from 'vue'
 import { useDismissableLayer } from '../src/lib/use-dismissable-layer'
 
 function firePointerDown(target: EventTarget) {
@@ -79,4 +79,65 @@ describe('useDismissableLayer', () => {
 
     expect(onDismiss).not.toHaveBeenCalled()
   })
+
+  it('only dismisses the topmost layer on Escape when layers are stacked', () => {
+    const container1 = document.createElement('div')
+    const container2 = document.createElement('div')
+    document.body.append(container1, container2)
+    const active1 = ref(true)
+    const active2 = ref(true)
+    const onDismiss1 = vi.fn()
+    const onDismiss2 = vi.fn()
+    useDismissableLayer(ref(container1), active1, { onDismiss: onDismiss1 })
+    useDismissableLayer(ref(container2), active2, { onDismiss: onDismiss2 })
+
+    document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true }))
+
+    expect(onDismiss2).toHaveBeenCalledOnce()
+    expect(onDismiss1).not.toHaveBeenCalled()
+
+    active1.value = false
+    active2.value = false
+  })
+
+  it('only dismisses the topmost layer on pointerdown outside it, even inside a lower layer', () => {
+    const container1 = document.createElement('div')
+    const container2 = document.createElement('div')
+    document.body.append(container1, container2)
+    const active1 = ref(true)
+    const active2 = ref(true)
+    const onDismiss1 = vi.fn()
+    const onDismiss2 = vi.fn()
+    useDismissableLayer(ref(container1), active1, { onDismiss: onDismiss1 })
+    useDismissableLayer(ref(container2), active2, { onDismiss: onDismiss2 })
+
+    firePointerDown(container1)
+
+    expect(onDismiss2).toHaveBeenCalledOnce()
+    expect(onDismiss1).not.toHaveBeenCalled()
+
+    active1.value = false
+    active2.value = false
+  })
+
+  it('promotes the next layer to topmost once the top layer deactivates', async () => {
+    const container1 = document.createElement('div')
+    const container2 = document.createElement('div')
+    document.body.append(container1, container2)
+    const active1 = ref(true)
+    const active2 = ref(true)
+    const onDismiss1 = vi.fn()
+    const onDismiss2 = vi.fn()
+    useDismissableLayer(ref(container1), active1, { onDismiss: onDismiss1 })
+    useDismissableLayer(ref(container2), active2, { onDismiss: onDismiss2 })
+
+    active2.value = false
+    await nextTick()
+
+    document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true }))
+
+    expect(onDismiss1).toHaveBeenCalledOnce()
+
+    active1.value = false
+  })
 })
diff --git a/packages/playground/.storybook/preview.ts b/packages/playground/.storybook/preview.ts
index da1aae2..bc33c3a 100644
--- a/packages/playground/.storybook/preview.ts
+++ b/packages/playground/.storybook/preview.ts
@@ -1,4 +1,5 @@
 import type { Preview } from '@storybook/vue3-vite'
+import { useGlobals } from 'storybook/preview-api'
 import '@nychthemeron/library/theme'
 
 const preview: Preview = {
@@ -13,20 +14,42 @@ const preview: Preview = {
         dynamicTitle: true,
       },
     },
+    // Match Storybook's built-in backgrounds addon (used by the Docs page's
+    // embedded canvas) to the same surface-0 colors as our hades/apollo
+    // theme, instead of its generic white/black defaults.
+    backgrounds: {
+      options: {
+        dark: { name: 'dark', value: '#18160f' },
+        light: { name: 'light', value: '#faf7f2' },
+      },
+    },
     docs: {
       description: {
         component: 'Component documentation',
       },
     },
   },
+  initialGlobals: {
+    backgrounds: { value: 'dark' },
+  },
   decorators: [
     (story, context) => {
       const theme = context.globals.theme || 'hades'
 
+      // Set eagerly (not inside setup()) since Storybook doesn't remount the
+      // story tree on a globals-only change, so setup() wouldn't rerun.
+      document.documentElement.setAttribute('data-theme', theme)
+
+      // Keep the built-in backgrounds addon (used by the Docs page's
+      // embedded canvas) in lockstep with the theme toggle, so switching
+      // Hades/Apollo also switches which background swatch is active.
+      const [globals, updateGlobals] = useGlobals()
+      const wantedBackground = theme === 'apollo' ? 'light' : 'dark'
+      if (globals.backgrounds?.value !== wantedBackground) {
+        updateGlobals({ backgrounds: { value: wantedBackground } })
+      }
+
       return {
-        setup() {
-          document.documentElement.setAttribute('data-theme', theme)
-        },
         components: { story },
         template: '<story />',
       }