diff --git a/docs/design/PLATFORM_HOME_PUBLIC_BROWSE_AND_LOGIN_MODAL_GATING_DESIGN_2026-04-19.md b/docs/design/PLATFORM_HOME_PUBLIC_BROWSE_AND_LOGIN_MODAL_GATING_DESIGN_2026-04-19.md
index 8eac1260..2f6412bb 100644
--- a/docs/design/PLATFORM_HOME_PUBLIC_BROWSE_AND_LOGIN_MODAL_GATING_DESIGN_2026-04-19.md
+++ b/docs/design/PLATFORM_HOME_PUBLIC_BROWSE_AND_LOGIN_MODAL_GATING_DESIGN_2026-04-19.md
@@ -112,6 +112,7 @@
 - 用户主动关闭弹窗时，只关闭弹窗，不改变当前平台页面
 - 不清空首页浏览状态
 - 不自动跳转到其他 tab
+- 登录弹窗下次重新打开时必须恢复初始表单状态：回到默认登录页签、关闭重置密码面板、清空密码 / 验证码 / 图形验证码 / 提示 / 倒计时等本次草稿状态；只允许保留“最近一次成功登录手机号”的本地回填能力。
 
 ---
 
diff --git a/src/components/auth/AuthGate.test.tsx b/src/components/auth/AuthGate.test.tsx
index cb879e3b..5b793f01 100644
--- a/src/components/auth/AuthGate.test.tsx
+++ b/src/components/auth/AuthGate.test.tsx
@@ -312,6 +312,68 @@ test('auth gate shows sms send feedback in the login modal', async () => {
   expect(within(dialog).getByRole('button', { name: '60s' })).toBeTruthy();
 });
 
+test('login modal resets draft state every time it is reopened', async () => {
+  const user = userEvent.setup();
+
+  authMocks.getAuthLoginOptions.mockResolvedValue({
+    availableLoginMethods: ['phone', 'password'],
+  });
+
+  render(
+    <AuthGate>
+      <ProtectedActionButton onAuthenticated={vi.fn()} />
+    </AuthGate>,
+  );
+
+  await user.click(await screen.findByRole('button', { name: '进入作品' }));
+
+  const firstDialog = screen.getByRole('dialog', { name: '账号入口' });
+  await user.type(within(firstDialog).getByLabelText('手机号'), '13800000000');
+  await user.click(within(firstDialog).getByRole('button', { name: '获取验证码' }));
+
+  expect(
+    await within(firstDialog).findByText('短信请求已提交，验证码有效期约 5 分钟。'),
+  ).toBeTruthy();
+  await user.type(within(firstDialog).getByLabelText('验证码'), '123456');
+  await user.click(within(firstDialog).getByRole('tab', { name: '密码登录' }));
+  await user.type(within(firstDialog).getByLabelText('密码'), 'passw0rd');
+  await user.click(within(firstDialog).getByRole('button', { name: '忘记密码' }));
+
+  expect(
+    screen.getByRole('dialog', { name: '重置密码' }),
+  ).toBeTruthy();
+
+  await user.click(
+    screen.getByRole('button', { name: '关闭登录弹窗' }),
+  );
+
+  await waitFor(() => {
+    expect(screen.queryByRole('dialog', { name: '账号入口' })).toBeNull();
+  });
+
+  await user.click(screen.getByRole('button', { name: '进入作品' }));
+
+  const reopenedDialog = screen.getByRole('dialog', { name: '账号入口' });
+  expect(
+    within(reopenedDialog)
+      .getByRole('tab', { name: '短信登录' })
+      .getAttribute('aria-selected'),
+  ).toBe('true');
+  expect(
+    (within(reopenedDialog).getByLabelText('手机号') as HTMLInputElement).value,
+  ).toBe('');
+  expect(
+    (within(reopenedDialog).getByLabelText('验证码') as HTMLInputElement).value,
+  ).toBe('');
+  expect(within(reopenedDialog).queryByLabelText('密码')).toBeNull();
+  expect(
+    within(reopenedDialog).queryByText('短信请求已提交，验证码有效期约 5 分钟。'),
+  ).toBeNull();
+  expect(
+    within(reopenedDialog).getByRole('button', { name: '获取验证码' }),
+  ).toBeTruthy();
+});
+
 test('auth gate separates sms and password login by tabs', async () => {
   const user = userEvent.setup();
 
diff --git a/src/components/auth/LoginScreen.tsx b/src/components/auth/LoginScreen.tsx
index 02aa9bb0..11634992 100644
--- a/src/components/auth/LoginScreen.tsx
+++ b/src/components/auth/LoginScreen.tsx
@@ -75,6 +75,26 @@ export function LoginScreen({
   const wechatLoginEnabled = availableLoginMethods.includes('wechat');
   const [activeLoginTab, setActiveLoginTab] = useState<LoginTab>('phone');
 
+  useEffect(() => {
+    if (!isOpen) {
+      return;
+    }
+
+    // 每次重新打开弹窗都丢弃上一次未完成的表单草稿，只保留最近成功登录手机号回填。
+    setIsResetPanelOpen(false);
+    setPhone(getStoredLastLoginPhone());
+    setPassword('');
+    setCode('');
+    setResetPhone('');
+    setResetCode('');
+    setResetPasswordValue('');
+    setCaptchaAnswer('');
+    setCooldownSeconds(0);
+    setResetCooldownSeconds(0);
+    setHint('');
+    setActiveLoginTab(phoneLoginEnabled ? 'phone' : 'password');
+  }, [isOpen, phoneLoginEnabled]);
+
   useEffect(() => {
     if (activeLoginTab === 'phone' && !phoneLoginEnabled && passwordLoginEnabled) {
       setActiveLoginTab('password');