diff --git a/frontend/src/views/user/AffiliateView.vue b/frontend/src/views/user/AffiliateView.vue
index 66417d23dd..fdf0a35d66 100644
--- a/frontend/src/views/user/AffiliateView.vue
+++ b/frontend/src/views/user/AffiliateView.vue
@@ -51,9 +51,9 @@
           <div class="mt-5 grid gap-4 md:grid-cols-2">
             <div class="space-y-2">
               <p class="text-sm font-medium text-gray-700 dark:text-gray-300">{{ t('affiliate.yourCode') }}</p>
-              <div class="flex items-center gap-2 rounded-xl border border-gray-200 bg-gray-50 px-3 py-2 dark:border-dark-700 dark:bg-dark-900">
-                <code class="flex-1 truncate text-sm font-semibold text-gray-900 dark:text-white">{{ detail.aff_code }}</code>
-                <button class="btn btn-secondary btn-sm" @click="copyCode">
+              <div class="flex flex-col items-stretch gap-2 rounded-xl border border-gray-200 bg-gray-50 px-3 py-2 dark:border-dark-700 dark:bg-dark-900 sm:flex-row sm:items-center">
+                <code class="min-w-0 break-all text-sm font-semibold text-gray-900 dark:text-white sm:flex-1 sm:truncate">{{ detail.aff_code }}</code>
+                <button class="btn btn-secondary btn-sm w-full sm:w-auto sm:shrink-0" @click="copyCode">
                   <Icon name="copy" size="sm" />
                   <span>{{ t('affiliate.copyCode') }}</span>
                 </button>
@@ -62,9 +62,9 @@
 
             <div class="space-y-2">
               <p class="text-sm font-medium text-gray-700 dark:text-gray-300">{{ t('affiliate.inviteLink') }}</p>
-              <div class="flex items-center gap-2 rounded-xl border border-gray-200 bg-gray-50 px-3 py-2 dark:border-dark-700 dark:bg-dark-900">
-                <code class="flex-1 truncate text-sm text-gray-700 dark:text-gray-300">{{ inviteLink }}</code>
-                <button class="btn btn-secondary btn-sm" @click="copyInviteLink">
+              <div class="flex flex-col items-stretch gap-2 rounded-xl border border-gray-200 bg-gray-50 px-3 py-2 dark:border-dark-700 dark:bg-dark-900 sm:flex-row sm:items-center">
+                <code class="min-w-0 break-all text-sm text-gray-700 dark:text-gray-300 sm:flex-1 sm:truncate">{{ inviteLink }}</code>
+                <button class="btn btn-secondary btn-sm w-full sm:w-auto sm:shrink-0" @click="copyInviteLink">
                   <Icon name="copy" size="sm" />
                   <span>{{ t('affiliate.copyLink') }}</span>
                 </button>
diff --git a/frontend/src/views/user/__tests__/AffiliateView.spec.ts b/frontend/src/views/user/__tests__/AffiliateView.spec.ts
new file mode 100644
index 0000000000..e3eb0d7841
--- /dev/null
+++ b/frontend/src/views/user/__tests__/AffiliateView.spec.ts
@@ -0,0 +1,116 @@
+import { flushPromises, mount } from '@vue/test-utils'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+import AffiliateView from '../AffiliateView.vue'
+
+const { copyToClipboard, getAffiliateDetail } = vi.hoisted(() => ({
+  copyToClipboard: vi.fn(),
+  getAffiliateDetail: vi.fn(),
+}))
+
+vi.mock('@/api/user', () => ({
+  default: {
+    getAffiliateDetail,
+    transferAffiliateQuota: vi.fn(),
+  },
+}))
+
+vi.mock('@/stores/app', () => ({
+  useAppStore: () => ({
+    showError: vi.fn(),
+    showSuccess: vi.fn(),
+  }),
+}))
+
+vi.mock('@/stores/auth', () => ({
+  useAuthStore: () => ({
+    refreshUser: vi.fn(),
+  }),
+}))
+
+vi.mock('@/composables/useClipboard', () => ({
+  useClipboard: () => ({ copyToClipboard }),
+}))
+
+vi.mock('vue-i18n', async (importOriginal) => {
+  const actual = await importOriginal<typeof import('vue-i18n')>()
+  return {
+    ...actual,
+    useI18n: () => ({
+      t: (key: string) => key,
+    }),
+  }
+})
+
+describe('AffiliateView', () => {
+  const affiliateCode = 'affiliate-code-that-is-long-enough-to-overflow-a-mobile-viewport'
+
+  beforeEach(() => {
+    vi.clearAllMocks()
+    copyToClipboard.mockResolvedValue(true)
+    getAffiliateDetail.mockResolvedValue({
+      user_id: 1,
+      aff_code: affiliateCode,
+      inviter_id: null,
+      aff_count: 0,
+      aff_quota: 0,
+      aff_frozen_quota: 0,
+      aff_history_quota: 0,
+      effective_rebate_rate_percent: 10,
+      invitees: [],
+    })
+  })
+
+  it('stacks long values and copy controls on mobile while retaining desktop rows', async () => {
+    const wrapper = mount(AffiliateView, {
+      global: {
+        stubs: {
+          AppLayout: { template: '<main><slot /></main>' },
+          Icon: true,
+        },
+      },
+    })
+
+    await flushPromises()
+
+    const values = wrapper.findAll('code')
+    expect(values).toHaveLength(2)
+    for (const value of values) {
+      expect(value.classes()).toEqual(expect.arrayContaining([
+        'min-w-0',
+        'break-all',
+        'sm:flex-1',
+        'sm:truncate',
+      ]))
+      expect(Array.from(value.element.parentElement?.classList ?? [])).toEqual(expect.arrayContaining([
+        'flex-col',
+        'items-stretch',
+        'sm:flex-row',
+        'sm:items-center',
+      ]))
+    }
+
+    const copyButtons = wrapper.findAll('button').filter((button) =>
+      ['affiliate.copyCode', 'affiliate.copyLink'].includes(button.text()),
+    )
+    expect(copyButtons).toHaveLength(2)
+    for (const button of copyButtons) {
+      expect(button.classes()).toEqual(expect.arrayContaining([
+        'w-full',
+        'sm:w-auto',
+        'sm:shrink-0',
+      ]))
+    }
+
+    await copyButtons[0].trigger('click')
+    await copyButtons[1].trigger('click')
+    await flushPromises()
+
+    expect(copyToClipboard).toHaveBeenNthCalledWith(1, affiliateCode, 'affiliate.codeCopied')
+    expect(copyToClipboard).toHaveBeenNthCalledWith(
+      2,
+      `${window.location.origin}/register?aff=${encodeURIComponent(affiliateCode)}`,
+      'affiliate.linkCopied',
+    )
+  })
+})