diff --git a/src/app/auth/components/__tests__/tailwind-components.test.tsx b/src/app/auth/components/__tests__/tailwind-components.test.tsx
index 5e6e7cf8..372b41f2 100644
--- a/src/app/auth/components/__tests__/tailwind-components.test.tsx
+++ b/src/app/auth/components/__tests__/tailwind-components.test.tsx
@@ -3,6 +3,9 @@ import { describe, expect, it, vi } from "vitest";
 
 import { AuthBackground } from "../auth-background";
 import { AuthErrorMessage } from "../auth-error-message";
+import { AuthLegalText } from "../auth-legal-text";
+import { AuthSocialButton } from "../auth-social-button";
+import { AuthTextField } from "../auth-text-field";
 import { EmailLoginForm } from "../email-login-form";
 import { EmailRegisterForm } from "../email-register-form";
 
@@ -49,4 +52,42 @@ describe("auth Tailwind components", () => {
     expect(html).toContain("object-cover");
     expect(html).toContain("%2Fimages%2Fauth%2Fbg-login.png");
   });
+
+  it("renders AuthSocialButton with Tailwind button layout", () => {
+    const html = renderToStaticMarkup(
+      <AuthSocialButton icon={<span>G</span>}>Continue</AuthSocialButton>,
+    );
+
+    expect(html).toContain("min-h-[var(--auth-social-button-height)]");
+    expect(html).toContain("border-auth-border");
+    expect(html).toContain("text-auth-text-primary");
+    expect(html).toContain("Continue");
+  });
+
+  it("renders AuthLegalText with Tailwind checkbox and links", () => {
+    const html = renderToStaticMarkup(<AuthLegalText />);
+
+    expect(html).toContain('aria-label="Agree to terms"');
+    expect(html).toContain("size-[var(--auth-legal-checkbox-size)]");
+    expect(html).toContain("bg-auth-legal-check");
+    expect(html).toContain("Privacy Agreement");
+    expect(html).toContain("Terms of User");
+  });
+
+  it("renders AuthTextField with Tailwind input states", () => {
+    const html = renderToStaticMarkup(
+      <AuthTextField
+        value="bad"
+        onChange={() => {}}
+        label="Email"
+        placeholder="Email"
+        errorMessage="Invalid email"
+      />,
+    );
+
+    expect(html).toContain("min-h-[var(--auth-field-height)]");
+    expect(html).toContain("placeholder:text-auth-input-placeholder");
+    expect(html).toContain("text-auth-text-primary");
+    expect(html).toContain("Invalid email");
+  });
 });
diff --git a/src/app/auth/components/auth-legal-text.module.css b/src/app/auth/components/auth-legal-text.module.css
deleted file mode 100644
index 6608342f..00000000
--- a/src/app/auth/components/auth-legal-text.module.css
+++ /dev/null
@@ -1,56 +0,0 @@
-/* 
- *
- * 视觉规格（与 Dart 对齐）：
- *   - 行：16px 白色圆形复选框 + 12px 富文本
- *   - 复选框选中时 10px 粉色实心圆
- *   - 链接加粗（Privacy Policy / Terms of Service）
- */
-.row {
-  display: flex;
-  align-items: flex-start;
-  gap: var(--spacing-sm);
-  width: 100%;
-}
-
-.checkbox {
-  flex: 0 0 auto;
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  width: var(--auth-legal-checkbox-size);
-  height: var(--auth-legal-checkbox-size);
-  border-radius: 50%;
-  background: var(--color-auth-surface);
-  border: 1px solid var(--color-auth-surface);
-  padding: 0;
-  cursor: pointer;
-  margin-top: 2px;
-  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.06);
-}
-
-.checkboxInner {
-  display: block;
-  width: var(--auth-legal-checkbox-inner-size);
-  height: var(--auth-legal-checkbox-inner-size);
-  border-radius: 50%;
-  background: var(--color-auth-legal-check);
-}
-
-.text {
-  margin: 0;
-  font-size: var(--responsive-caption, var(--font-size-sm));
-  line-height: 1.4;
-  color: var(--color-auth-text-primary);
-  text-align: left;
-  flex: 1 1 auto;
-}
-
-.link {
-  color: var(--color-auth-text-primary);
-  font-weight: 700;
-  text-decoration: none;
-}
-
-.link:hover {
-  text-decoration: underline;
-}
diff --git a/src/app/auth/components/auth-legal-text.tsx b/src/app/auth/components/auth-legal-text.tsx
index d319d4a5..29644c0a 100644
--- a/src/app/auth/components/auth-legal-text.tsx
+++ b/src/app/auth/components/auth-legal-text.tsx
@@ -15,27 +15,27 @@ import { useState } from "react";
 
 import { AppConstants } from "@/core/app_constants";
 
-import styles from "./auth-legal-text.module.css";
-
 export function AuthLegalText() {
   const [checked, setChecked] = useState(true);
 
   return (
-    <div className={styles.row}>
+    <div className="flex w-full items-start gap-sm">
       <button
         type="button"
-        className={styles.checkbox}
+        className="mt-0.5 inline-flex size-[var(--auth-legal-checkbox-size)] flex-none cursor-pointer items-center justify-center rounded-full border border-auth-surface bg-auth-surface p-0 shadow-[0_0_0_1px_rgba(0,0,0,0.06)]"
         onClick={() => setChecked((c) => !c)}
         aria-label="Agree to terms"
         aria-pressed={checked}
       >
-        {checked ? <span className={styles.checkboxInner} /> : null}
+        {checked ? (
+          <span className="block size-[var(--auth-legal-checkbox-inner-size)] rounded-full bg-auth-legal-check" />
+        ) : null}
       </button>
-      <p className={styles.text}>
+      <p className="m-0 flex-auto text-left text-[var(--responsive-caption)] leading-[1.4] text-auth-text-primary">
         I agree to the Cozsweet {" "}
         <a
           href={AppConstants.privacyPolicyUrl}
-          className={styles.link}
+          className="font-bold text-auth-text-primary no-underline hover:underline"
           target="_blank"
           rel="noreferrer"
         >
@@ -44,7 +44,7 @@ export function AuthLegalText() {
         and{" "}
         <a
           href={AppConstants.termsOfServiceUrl}
-          className={styles.link}
+          className="font-bold text-auth-text-primary no-underline hover:underline"
           target="_blank"
           rel="noreferrer"
         >
diff --git a/src/app/auth/components/auth-social-button.module.css b/src/app/auth/components/auth-social-button.module.css
deleted file mode 100644
index 31b5f41a..00000000
--- a/src/app/auth/components/auth-social-button.module.css
+++ /dev/null
@@ -1,50 +0,0 @@
-/* 
- *
- * 视觉规格（与 Dart 弹层按钮对齐）：
- *   - 40px 高
- *   - 白底 + 1px 边框 `--color-auth-border` (#d5d7db)
- *   - 半径 20
- *   - 无阴影
- *   - 图标 20×20 + 标签
- *   - 14px 文字深色
- */
-.button {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  gap: var(--spacing-md);
-  width: 100%;
-  min-height: var(--auth-social-button-height);
-  padding: 0 var(--spacing-lg);
-  border: 1px solid var(--color-auth-border);
-  border-radius: var(--radius-full, 999px);
-  background: var(--color-auth-surface);
-  color: var(--color-auth-text-primary);
-  font-size: var(--responsive-body, var(--font-size-md));
-  font-weight: 500;
-  cursor: pointer;
-  transition: background 0.15s ease, opacity 0.15s ease;
-}
-
-.button:hover:not(:disabled) {
-  background: rgba(0, 0, 0, 0.02);
-}
-
-.button:disabled {
-  opacity: 0.5;
-  cursor: not-allowed;
-}
-
-.icon {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  width: 20px;
-  height: 20px;
-  flex: 0 0 auto;
-}
-
-.label {
-  flex: 0 0 auto;
-  text-align: center;
-}
diff --git a/src/app/auth/components/auth-social-button.tsx b/src/app/auth/components/auth-social-button.tsx
index 1e3cddcd..a0821b72 100644
--- a/src/app/auth/components/auth-social-button.tsx
+++ b/src/app/auth/components/auth-social-button.tsx
@@ -17,8 +17,6 @@ import {
   type ReactNode,
 } from "react";
 
-import styles from "./auth-social-button.module.css";
-
 export interface AuthSocialButtonProps
   extends Omit<ButtonHTMLAttributes<HTMLButtonElement>, "children"> {
   icon?: ReactNode;
@@ -37,11 +35,20 @@ export function AuthSocialButton({
     <button
       type={type}
       disabled={disabled}
-      className={[styles.button, className].filter(Boolean).join(" ")}
+      className={[
+        "inline-flex min-h-[var(--auth-social-button-height)] w-full cursor-pointer items-center justify-center gap-md rounded-full border border-auth-border bg-auth-surface px-lg text-[var(--responsive-body)] font-medium text-auth-text-primary transition-[background,opacity] duration-150 enabled:hover:bg-[rgba(0,0,0,0.02)] disabled:cursor-not-allowed disabled:opacity-50",
+        className,
+      ]
+        .filter(Boolean)
+        .join(" ")}
       {...rest}
     >
-      {icon ? <span className={styles.icon}>{icon}</span> : null}
-      <span className={styles.label}>{children}</span>
+      {icon ? (
+        <span className="inline-flex size-5 flex-none items-center justify-center">
+          {icon}
+        </span>
+      ) : null}
+      <span className="flex-none text-center">{children}</span>
     </button>
   );
 }
diff --git a/src/app/auth/components/auth-text-field.module.css b/src/app/auth/components/auth-text-field.module.css
deleted file mode 100644
index f18cca77..00000000
--- a/src/app/auth/components/auth-text-field.module.css
+++ /dev/null
@@ -1,59 +0,0 @@
-/* 
- *
- * 视觉规格（与 Dart 对齐）：
- *   - 46px 高
- *   - 白底胶囊（半径 24）
- *   - 无边框
- *   - 10% 粉色阴影（accent #f759a8 @ 10%）
- *   - padding: 0 16 0 24
- *   - 文字深色 #333，占位符 #999
- */
-.wrapper {
-  display: flex;
-  flex-direction: column;
-  gap: var(--spacing-xs);
-  width: 100%;
-}
-
-.label {
-  font-size: var(--responsive-caption, var(--font-size-sm));
-  color: var(--color-text-secondary);
-}
-
-.input {
-  width: 100%;
-  min-height: var(--auth-field-height);
-  padding: 0 var(--spacing-lg) 0 var(--spacing-xxl);
-  border: none;
-  border-radius: var(--radius-full, 999px);
-  background: var(--color-auth-surface);
-  color: var(--color-auth-text-primary);
-  font-size: var(--responsive-body, var(--font-size-md));
-  box-shadow: 0 3px 5px var(--color-auth-input-shadow);
-  outline: none;
-  transition: box-shadow 0.15s ease;
-}
-
-.input::placeholder {
-  color: var(--color-auth-input-placeholder);
-}
-
-.input:focus {
-  box-shadow: 0 3px 5px var(--color-auth-input-shadow),
-    0 0 0 2px var(--color-accent);
-}
-
-.invalid {
-  box-shadow: 0 3px 5px rgba(255, 77, 79, 0.18),
-    0 0 0 1px var(--color-error);
-}
-
-.invalid:focus {
-  box-shadow: 0 3px 5px rgba(255, 77, 79, 0.18),
-    0 0 0 2px var(--color-error);
-}
-
-.error {
-  font-size: var(--responsive-caption, var(--font-size-sm));
-  color: var(--color-error);
-}
diff --git a/src/app/auth/components/auth-text-field.tsx b/src/app/auth/components/auth-text-field.tsx
index 372fb7a1..45792655 100644
--- a/src/app/auth/components/auth-text-field.tsx
+++ b/src/app/auth/components/auth-text-field.tsx
@@ -11,8 +11,6 @@ import {
   forwardRef,
 } from "react";
 
-import styles from "./auth-text-field.module.css";
-
 export interface AuthTextFieldProps {
   value: string;
   onChange: (value: string) => void;
@@ -44,14 +42,25 @@ export const AuthTextField = forwardRef<HTMLInputElement, AuthTextFieldProps>(
     },
     ref,
   ) {
+    const inputClassName = [
+      "min-h-[var(--auth-field-height)] w-full rounded-full border-0 bg-auth-surface py-0 pl-xxl pr-lg text-[var(--responsive-body)] text-auth-text-primary shadow-[0_3px_5px_var(--color-auth-input-shadow)] outline-none transition-shadow duration-150 placeholder:text-auth-input-placeholder focus:shadow-[0_3px_5px_var(--color-auth-input-shadow),0_0_0_2px_var(--color-accent)] disabled:cursor-not-allowed disabled:opacity-70",
+      errorMessage
+        ? "shadow-[0_3px_5px_rgba(255,77,79,0.18),0_0_0_1px_var(--color-error)] focus:shadow-[0_3px_5px_rgba(255,77,79,0.18),0_0_0_2px_var(--color-error)]"
+        : "",
+    ]
+      .filter(Boolean)
+      .join(" ");
+
     return (
-      <label className={styles.wrapper}>
-        {label ? <span className={styles.label}>{label}</span> : null}
+      <label className="flex w-full flex-col gap-xs">
+        {label ? (
+          <span className="text-[var(--responsive-caption)] text-text-secondary">
+            {label}
+          </span>
+        ) : null}
         <input
           ref={ref}
-          className={[styles.input, errorMessage ? styles.invalid : ""]
-            .filter(Boolean)
-            .join(" ")}
+          className={inputClassName}
           value={value}
           onChange={(e: ChangeEvent<HTMLInputElement>) =>
             onChange(e.target.value)
@@ -70,7 +79,9 @@ export const AuthTextField = forwardRef<HTMLInputElement, AuthTextFieldProps>(
           }}
         />
         {errorMessage ? (
-          <span className={styles.error}>{errorMessage}</span>
+          <span className="text-[var(--responsive-caption)] text-error">
+            {errorMessage}
+          </span>
         ) : null}
       </label>
     );