diff --git a/src/app/auth/auth-screen.tsx b/src/app/auth/auth-screen.tsx
index e83bb5f5..e5d449ed 100644
--- a/src/app/auth/auth-screen.tsx
+++ b/src/app/auth/auth-screen.tsx
@@ -13,7 +13,6 @@ import { ROUTES } from "@/router/routes";
 import { useAppNavigator } from "@/router/use-app-navigator";
 
 import { AuthBackground, AuthPanel } from "./components";
-import styles from "./components/auth-screen.module.css";
 import { Logger } from "@/utils";
 
 const log = new Logger("AppAuthAuthScreen");
@@ -51,9 +50,15 @@ export function AuthScreen() {
 
   return (
     <MobileShell>
-      <div className={styles.wrapper}>
+      <div className="relative flex min-h-[var(--app-viewport-height,100dvh)] w-full flex-1 flex-col overflow-hidden bg-[#fbf1f2]">
         <AuthBackground />
-        <div className={styles.content}>
+        <div
+          className="relative z-[2] flex flex-auto flex-col justify-center"
+          style={{
+            padding:
+              "calc(var(--page-padding-y, var(--spacing-lg)) + var(--app-safe-top, 0px)) calc(var(--page-padding-x, var(--spacing-lg)) + var(--app-safe-right, 0px)) calc(var(--page-padding-y, var(--spacing-lg)) + var(--app-safe-bottom, 0px)) calc(var(--page-padding-x, var(--spacing-lg)) + var(--app-safe-left, 0px))",
+          }}
+        >
           <AuthPanel />
         </div>
       </div>
diff --git a/src/app/auth/components/__tests__/tailwind-components.test.tsx b/src/app/auth/components/__tests__/tailwind-components.test.tsx
index 91fede1a..5e6e7cf8 100644
--- a/src/app/auth/components/__tests__/tailwind-components.test.tsx
+++ b/src/app/auth/components/__tests__/tailwind-components.test.tsx
@@ -1,7 +1,14 @@
 import { renderToStaticMarkup } from "react-dom/server";
-import { describe, expect, it } from "vitest";
+import { describe, expect, it, vi } from "vitest";
 
+import { AuthBackground } from "../auth-background";
 import { AuthErrorMessage } from "../auth-error-message";
+import { EmailLoginForm } from "../email-login-form";
+import { EmailRegisterForm } from "../email-register-form";
+
+vi.mock("@/stores/auth/auth-context", () => ({
+  useAuthDispatch: () => vi.fn(),
+}));
 
 describe("auth Tailwind components", () => {
   it("renders AuthErrorMessage only when a message is present", () => {
@@ -12,4 +19,34 @@ describe("auth Tailwind components", () => {
     expect(html).toContain("text-error");
     expect(html).toContain("Invalid email");
   });
+
+  it("renders EmailLoginForm with Tailwind form layout", () => {
+    const html = renderToStaticMarkup(<EmailLoginForm />);
+
+    expect(html).toContain("<form");
+    expect(html).toContain("flex");
+    expect(html).toContain("w-full");
+    expect(html).toContain("gap-md");
+    expect(html).toContain("Login");
+  });
+
+  it("renders EmailRegisterForm with Tailwind form layout", () => {
+    const html = renderToStaticMarkup(<EmailRegisterForm />);
+
+    expect(html).toContain("<form");
+    expect(html).toContain("flex");
+    expect(html).toContain("w-full");
+    expect(html).toContain("gap-md");
+    expect(html).toContain("Register");
+  });
+
+  it("renders AuthBackground with Tailwind layout classes", () => {
+    const html = renderToStaticMarkup(<AuthBackground />);
+
+    expect(html).toContain("absolute");
+    expect(html).toContain("inset-0");
+    expect(html).toContain("bg-[#fbf1f2]");
+    expect(html).toContain("object-cover");
+    expect(html).toContain("%2Fimages%2Fauth%2Fbg-login.png");
+  });
 });
diff --git a/src/app/auth/components/auth-background.module.css b/src/app/auth/components/auth-background.module.css
deleted file mode 100644
index 7ab89f18..00000000
--- a/src/app/auth/components/auth-background.module.css
+++ /dev/null
@@ -1,14 +0,0 @@
-/* Auth 背景图片容器（与 splash-background.module.css 同款） */
-
-.bg {
-  position: absolute;
-  inset: 0;
-  z-index: 0;
-  background: #fbf1f2;
-  overflow: hidden;
-}
-
-.image {
-  object-fit: cover;
-  object-position: center;
-}
diff --git a/src/app/auth/components/auth-background.tsx b/src/app/auth/components/auth-background.tsx
index be8a346b..108adfba 100644
--- a/src/app/auth/components/auth-background.tsx
+++ b/src/app/auth/components/auth-background.tsx
@@ -5,18 +5,17 @@
  * 资源: /public/images/auth/bg-login.png
  */
 import Image from "next/image";
-import styles from "./auth-background.module.css";
 
 export function AuthBackground() {
   return (
-    <div className={styles.bg}>
+    <div className="absolute inset-0 z-0 overflow-hidden bg-[#fbf1f2]">
       <Image
         src="/images/auth/bg-login.png"
         alt=""
         fill
         priority
         sizes="(max-width: 540px) 100vw, 540px"
-        className={styles.image}
+        className="object-cover object-center"
       />
     </div>
   );
diff --git a/src/app/auth/components/auth-panel.module.css b/src/app/auth/components/auth-panel.module.css
deleted file mode 100644
index 51303282..00000000
--- a/src/app/auth/components/auth-panel.module.css
+++ /dev/null
@@ -1,13 +0,0 @@
-/* 
- *
- * 视觉规格（与 Dart 对齐）：
- *   - panelShell 包裹整个面板（position: relative）
- */
-.panelShell {
-  position: relative;
-  flex: 1 1 auto;
-  display: flex;
-  flex-direction: column;
-  width: 100%;
-  min-height: 0;
-}
diff --git a/src/app/auth/components/auth-panel.tsx b/src/app/auth/components/auth-panel.tsx
index c8e3f1e0..39aab185 100644
--- a/src/app/auth/components/auth-panel.tsx
+++ b/src/app/auth/components/auth-panel.tsx
@@ -8,7 +8,6 @@ import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
 
 import { AuthEmailPanel } from "./auth-email-panel";
 import { AuthFacebookPanel } from "./auth-facebook-panel";
-import styles from "./auth-panel.module.css";
 
 export function AuthPanel() {
   const state = useAuthState();
@@ -29,7 +28,7 @@ export function AuthPanel() {
   };
 
   return (
-    <div className={styles.panelShell}>
+    <div className="relative flex min-h-0 w-full flex-auto flex-col">
       <BackButton onClick={handleBack} />
 
       {state.authPanelMode === "facebook" ? (
diff --git a/src/app/auth/components/auth-screen.module.css b/src/app/auth/components/auth-screen.module.css
deleted file mode 100644
index 615faa19..00000000
--- a/src/app/auth/components/auth-screen.module.css
+++ /dev/null
@@ -1,29 +0,0 @@
-/* auth-screen.module.css
- * 与 splash-screen.module.css 同款结构（MobileShell 顶层 + .wrapper + .content）
- * 移动端宽度约束由 ResponsiveMobileShell / MobileShell 统一提供。
- */
-
-.wrapper {
-  position: relative;
-  flex: 1;
-  display: flex;
-  flex-direction: column;
-  width: 100%;
-  min-height: var(--app-viewport-height, 100dvh);
-  background: #fbf1f2;
-  overflow: hidden;
-}
-
-.content {
-  position: relative;
-  z-index: 2;
-  display: flex;
-  flex: 1 1 auto;
-  flex-direction: column;
-  justify-content: center;
-  padding:
-    calc(var(--page-padding-y, var(--spacing-lg)) + var(--app-safe-top, 0px))
-    calc(var(--page-padding-x, var(--spacing-lg)) + var(--app-safe-right, 0px))
-    calc(var(--page-padding-y, var(--spacing-lg)) + var(--app-safe-bottom, 0px))
-    calc(var(--page-padding-x, var(--spacing-lg)) + var(--app-safe-left, 0px));
-}
diff --git a/src/app/auth/components/email-form.module.css b/src/app/auth/components/email-form.module.css
deleted file mode 100644
index 4b9a45ca..00000000
--- a/src/app/auth/components/email-form.module.css
+++ /dev/null
@@ -1,14 +0,0 @@
-/* 邮箱登录/注册表单样式
- *
- * 
- *
- * 视觉规格（与 Dart 对齐）：
- *   - 字段间距 12px（Dart AppSpacing.md）
- *   - 错误横幅与主按钮之间 12px
- */
-.form {
-  display: flex;
-  flex-direction: column;
-  gap: var(--spacing-md);
-  width: 100%;
-}
diff --git a/src/app/auth/components/email-login-form.tsx b/src/app/auth/components/email-login-form.tsx
index 8b0975c9..51bf1187 100644
--- a/src/app/auth/components/email-login-form.tsx
+++ b/src/app/auth/components/email-login-form.tsx
@@ -13,7 +13,6 @@ import {
 import { AuthTextField } from "./auth-text-field";
 import { AuthPrimaryButton } from "./auth-primary-button";
 import { AuthErrorMessage } from "./auth-error-message";
-import styles from "./email-form.module.css";
 import { AppEnvUtil, Logger } from "@/utils";
 
 const log = new Logger("AppAuthComponentsEmailLoginForm");
@@ -76,7 +75,7 @@ export function EmailLoginForm({
 
   return (
     <form
-      className={styles.form}
+      className="flex w-full flex-col gap-md"
       onSubmit={(e) => {
         e.preventDefault();
         submit();
diff --git a/src/app/auth/components/email-register-form.tsx b/src/app/auth/components/email-register-form.tsx
index 9a9366c3..148f3da0 100644
--- a/src/app/auth/components/email-register-form.tsx
+++ b/src/app/auth/components/email-register-form.tsx
@@ -24,7 +24,6 @@ import {
 import { AuthTextField } from "./auth-text-field";
 import { AuthPrimaryButton } from "./auth-primary-button";
 import { AuthErrorMessage } from "./auth-error-message";
-import styles from "./email-form.module.css";
 import { Logger } from "@/utils";
 
 const log = new Logger("AppAuthComponentsEmailRegisterForm");
@@ -112,7 +111,7 @@ export function EmailRegisterForm({
 
   return (
     <form
-      className={styles.form}
+      className="flex w-full flex-col gap-md"
       onSubmit={(e) => {
         e.preventDefault();
         submit();
diff --git a/src/app/auth/components/google-sign-in-button.module.css b/src/app/auth/components/google-sign-in-button.module.css
deleted file mode 100644
index bf971629..00000000
--- a/src/app/auth/components/google-sign-in-button.module.css
+++ /dev/null
@@ -1,7 +0,0 @@
-.slot {
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  width: 100%;
-  min-height: var(--button-height);
-}