diff --git a/public/images/auth/ic-logo-login.png b/public/images/auth/ic-logo-login.png
new file mode 100644
index 00000000..d5b13922
Binary files /dev/null and b/public/images/auth/ic-logo-login.png differ
diff --git a/public/images/auth/ic-logo-login@2x.png b/public/images/auth/ic-logo-login@2x.png
new file mode 100644
index 00000000..5bf0e279
Binary files /dev/null and b/public/images/auth/ic-logo-login@2x.png differ
diff --git a/public/images/auth/ic-logo-login@3x.png b/public/images/auth/ic-logo-login@3x.png
new file mode 100644
index 00000000..8f1c7084
Binary files /dev/null and b/public/images/auth/ic-logo-login@3x.png differ
diff --git a/src/app/_components/core/bottom-sheet.module.css b/src/app/_components/core/bottom-sheet.module.css
new file mode 100644
index 00000000..2ecccd2d
--- /dev/null
+++ b/src/app/_components/core/bottom-sheet.module.css
@@ -0,0 +1,34 @@
+/**
+ * 底部弹层样式
+ *
+ * 原始 Dart: showModalBottomSheet（透明背景，底部白卡 + 顶部圆角 radius28）
+ */
+.scrim {
+  position: fixed;
+  inset: 0;
+  z-index: 50;
+  display: flex;
+  align-items: flex-end;
+  justify-content: center;
+}
+
+.panel {
+  position: relative;
+  width: 100%;
+  max-width: 500px;
+  background: var(--color-auth-surface);
+  color: var(--color-auth-text-primary);
+  border-radius: var(--radius-bottom-sheet) var(--radius-bottom-sheet) 0 0;
+  box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.18);
+  padding-bottom: env(safe-area-inset-bottom);
+  animation: slideUp 0.18s ease-out;
+}
+
+@keyframes slideUp {
+  from {
+    transform: translateY(100%);
+  }
+  to {
+    transform: translateY(0);
+  }
+}
diff --git a/src/app/_components/core/bottom-sheet.tsx b/src/app/_components/core/bottom-sheet.tsx
new file mode 100644
index 00000000..b9b1a333
--- /dev/null
+++ b/src/app/_components/core/bottom-sheet.tsx
@@ -0,0 +1,75 @@
+"use client";
+/**
+ * 通用底部弹层（Bottom Sheet）
+ *
+ * 原始 Dart: 散落在各处的 `showModalBottomSheet`（auth_other_options_dialog 等）
+ *
+ * 设计目标：
+ *   - portal 渲染到 body
+ *   - 固定底部、最大宽度 500px、顶部圆角 `--radius-bottom-sheet`
+ *   - ESC 关闭 / 点击 scrim 关闭 / 打开时锁定 body 滚动
+ *   - 简单 slide-up 动画（与原 Dart 行为接近）
+ *   - 调用方只关心内容布局
+ */
+import { type ReactNode, useEffect } from "react";
+import { createPortal } from "react-dom";
+
+import styles from "./bottom-sheet.module.css";
+
+export interface BottomSheetProps {
+  open: boolean;
+  onClose: () => void;
+  children: ReactNode;
+  /** 蒙层透明度（0-1）。默认 0.45。 */
+  scrimOpacity?: number;
+  /** 禁用点击外部 / ESC 关闭。 */
+  persistent?: boolean;
+  /** ARIA 标签。 */
+  ariaLabel?: string;
+}
+
+export function BottomSheet({
+  open,
+  onClose,
+  children,
+  scrimOpacity = 0.45,
+  persistent = false,
+  ariaLabel,
+}: BottomSheetProps) {
+  useEffect(() => {
+    if (!open || typeof document === "undefined") return;
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === "Escape" && !persistent) onClose();
+    };
+    document.addEventListener("keydown", onKey);
+    const prevOverflow = document.body.style.overflow;
+    document.body.style.overflow = "hidden";
+    return () => {
+      document.removeEventListener("keydown", onKey);
+      document.body.style.overflow = prevOverflow;
+    };
+  }, [open, onClose, persistent]);
+
+  if (!open || typeof document === "undefined") return null;
+
+  return createPortal(
+    <div
+      className={styles.scrim}
+      style={{ background: `rgba(0, 0, 0, ${scrimOpacity})` }}
+      onClick={(e) => {
+        if (!persistent && e.target === e.currentTarget) onClose();
+      }}
+    >
+      <div
+        role="dialog"
+        aria-modal="true"
+        aria-label={ariaLabel}
+        className={styles.panel}
+        onClick={(e) => e.stopPropagation()}
+      >
+        {children}
+      </div>
+    </div>,
+    document.body,
+  );
+}
diff --git a/src/app/auth/components/auth-email-panel.module.css b/src/app/auth/components/auth-email-panel.module.css
index c8dbcf02..bd95551f 100644
--- a/src/app/auth/components/auth-email-panel.module.css
+++ b/src/app/auth/components/auth-email-panel.module.css
@@ -1,21 +1,75 @@
+/* 原始 Dart: lib/ui/auth/widgets/auth_email_panel.dart
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - 顶部：login 模式有 logo + 24px spacer；register 模式两个 24px spacer
+ *   - 表单 + 12px gap + 切换链接 + 16px gap + 弹层链接
+ *   - Spacer + 法律
+ *   - 切换链接：14px 黑色下划线居中
+ *   - "Other Sign In Options" 链接：14px 黑色下划线居中
+ */
 .panel {
   display: flex;
   flex-direction: column;
-  gap: var(--spacing-md);
+  align-items: stretch;
+  flex: 1 1 auto;
   width: 100%;
+  min-height: 0;
 }
 
-.backButton {
-  align-self: flex-start;
+.topSection {
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+}
+
+.spacer24 {
+  height: var(--spacing-xxl);
+}
+
+.logo {
+  display: block;
+  height: var(--auth-logo-height);
+  width: auto;
+  max-width: 220px;
+  margin: 0 auto;
+  object-fit: contain;
+}
+
+.spacer {
+  flex: 1 1 0;
+  min-height: var(--spacing-lg);
+}
+
+.toggleButton {
+  align-self: center;
   background: none;
   border: none;
-  padding: 0;
-  color: var(--color-text-secondary);
-  font-size: var(--font-size-sm);
+  padding: var(--spacing-md) 0 0;
+  font-size: var(--font-size-md);
+  color: var(--color-auth-text-primary);
+  text-decoration: underline;
+  text-underline-offset: 3px;
   cursor: pointer;
-  transition: color 0.15s ease;
+  transition: opacity 0.15s ease;
 }
 
-.backButton:hover {
-  color: var(--color-text-primary);
+.toggleButton:hover {
+  opacity: 0.8;
+}
+
+.linkButton {
+  align-self: center;
+  background: none;
+  border: none;
+  padding: var(--spacing-md) 0 var(--spacing-md);
+  font-size: var(--font-size-md);
+  color: var(--color-auth-text-primary);
+  text-decoration: underline;
+  text-underline-offset: 3px;
+  cursor: pointer;
+  transition: opacity 0.15s ease;
+}
+
+.linkButton:hover {
+  opacity: 0.8;
 }
diff --git a/src/app/auth/components/auth-email-panel.tsx b/src/app/auth/components/auth-email-panel.tsx
index 15a0f3ba..7f9af2ae 100644
--- a/src/app/auth/components/auth-email-panel.tsx
+++ b/src/app/auth/components/auth-email-panel.tsx
@@ -1,47 +1,117 @@
 "use client";
 /**
- * Email 面板
+ * Email 面板（login/register 内部切换）
  *
  * 原始 Dart: lib/ui/auth/widgets/auth_email_panel.dart
  *
- * 行为：
- *  - 内部 `authMode`（login/register）切换显示 Login / Register 表单
- *  - 提交派发 `AuthEmailLoginSubmitted` 或 `AuthEmailRegisterSubmitted`
+ * 视觉规格（与 Dart 对齐）：
+ *   - login 模式：顶部 24px spacer + logo（120h） + 24px gap
+ *   - register 模式：48px spacer（两个 24px，无 logo）
+ *   - 表单（EmailLoginForm / EmailRegisterForm）
+ *   - 12px gap + 切换链接（"Don't have an account? Sign up" / "Already have an account? Log in"）
+ *   - 16px gap + "Other Sign In Options" 链接（打开底部弹层）
+ *   - Spacer + AuthLegalText
+ *   - 顶部 "← Back" 按钮由父级 AuthPanel 渲染（悬浮 40×40 圆形）
  */
 import { useState } from "react";
 
 import { useAuthState } from "@/stores/auth/auth-context";
 
+import { AuthErrorMessage } from "./auth-error-message";
+import { AuthLegalText } from "./auth-legal-text";
+import { AuthOtherOptionsDialog } from "./auth-other-options-dialog";
 import { EmailLoginForm } from "./email-login-form";
 import { EmailRegisterForm } from "./email-register-form";
 import styles from "./auth-email-panel.module.css";
 
 export interface AuthEmailPanelProps {
-  onBack: () => void;
+  /** "Other Sign-in Options" 弹层中 Facebook 按钮回调（派发回 facebook 模式） */
+  onSwitchToFacebook: () => void;
+  /** "Other Sign-in Options" 弹层中 Google 按钮回调（可空；空时不渲染 Google 行） */
+  onGoogle?: () => void;
+  /** 弹层 Google 自定义子节点 */
+  googleSlot?: React.ReactNode;
 }
 
-export function AuthEmailPanel({ onBack }: AuthEmailPanelProps) {
+export function AuthEmailPanel({
+  onSwitchToFacebook,
+  onGoogle,
+  googleSlot,
+}: AuthEmailPanelProps) {
   const state = useAuthState();
   const [mode, setMode] = useState<"login" | "register">("login");
+  const [showOptions, setShowOptions] = useState(false);
 
   return (
     <div className={styles.panel}>
-      <button type="button" className={styles.backButton} onClick={onBack}>
-        ← Back
-      </button>
+      <div className={styles.topSection}>
+        {mode === "login" ? (
+          <>
+            <div className={styles.spacer24} />
+            <img
+              src="/images/auth/ic-logo-login.png"
+              alt="Cozsweet"
+              className={styles.logo}
+            />
+          </>
+        ) : (
+          <>
+            <div className={styles.spacer24} />
+            <div className={styles.spacer24} />
+          </>
+        )}
+        <div className={styles.spacer24} />
+      </div>
+
       {mode === "login" ? (
         <EmailLoginForm
-          onSwitchToRegister={() => setMode("register")}
           globalError={state.errorMessage}
           isLoading={state.isLoading}
         />
       ) : (
         <EmailRegisterForm
-          onSwitchToLogin={() => setMode("login")}
           globalError={state.errorMessage}
           isLoading={state.isLoading}
         />
       )}
+
+      <AuthErrorMessage message={state.errorMessage} />
+
+      <button
+        type="button"
+        className={styles.toggleButton}
+        onClick={() => setMode((m) => (m === "login" ? "register" : "login"))}
+      >
+        {mode === "login"
+          ? "Don't have an account? Sign up"
+          : "Already have an account? Log in"}
+      </button>
+
+      <button
+        type="button"
+        className={styles.linkButton}
+        onClick={() => setShowOptions(true)}
+      >
+        Other Sign In Options
+      </button>
+
+      <div className={styles.spacer} />
+      <AuthLegalText />
+
+      <AuthOtherOptionsDialog
+        open={showOptions}
+        onClose={() => setShowOptions(false)}
+        mode="email"
+        onFacebook={onSwitchToFacebook}
+        onGoogle={() => {
+          setShowOptions(false);
+          onGoogle?.();
+        }}
+        onEmail={() => {
+          // 在 email 模式下不再显示 Email 入口
+        }}
+        googleSlot={googleSlot}
+      />
     </div>
   );
 }
diff --git a/src/app/auth/components/auth-error-message.module.css b/src/app/auth/components/auth-error-message.module.css
index ac8d8eb4..608e3980 100644
--- a/src/app/auth/components/auth-error-message.module.css
+++ b/src/app/auth/components/auth-error-message.module.css
@@ -1,10 +1,16 @@
+/* 原始 Dart: lib/ui/auth/widgets/auth_error_message.dart
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - 细小红字，无背景，无圆角，无边框
+ *   - 12px 居中
+ */
 .banner {
   width: 100%;
-  padding: var(--spacing-md);
-  border-radius: var(--radius-md);
-  background: rgba(255, 77, 79, 0.12);
-  border: var(--border-light) solid rgba(255, 77, 79, 0.3);
+  padding: 0;
+  background: transparent;
+  border: none;
   color: var(--color-error);
   font-size: var(--font-size-sm);
   line-height: 1.4;
+  text-align: center;
 }
diff --git a/src/app/auth/components/auth-facebook-panel.module.css b/src/app/auth/components/auth-facebook-panel.module.css
index 31c5fefd..2a156e2d 100644
--- a/src/app/auth/components/auth-facebook-panel.module.css
+++ b/src/app/auth/components/auth-facebook-panel.module.css
@@ -1,21 +1,111 @@
+/* 原始 Dart: lib/ui/auth/widgets/auth_facebook_panel.dart
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - Spacer → logo（120h）→ Spacer → Facebook 主按钮 → 链接 → Spacer → 法律
+ *   - Facebook 主按钮：46px 白胶囊 + Facebook "f" 图标（#1877f2）
+ *   - 链接：14px 黑色下划线居中
+ */
 .panel {
   display: flex;
   flex-direction: column;
+  align-items: stretch;
+  flex: 1 1 auto;
+  width: 100%;
+  min-height: 0;
+}
+
+.spacer {
+  flex: 1 1 0;
+  min-height: var(--spacing-lg);
+}
+
+.logo {
+  display: block;
+  height: var(--auth-logo-height);
+  width: auto;
+  max-width: 220px;
+  margin: 0 auto;
+  object-fit: contain;
+}
+
+.facebookButton {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
   gap: var(--spacing-md);
   width: 100%;
+  height: var(--auth-field-height);
+  padding: 0 var(--spacing-lg);
+  border: none;
+  border-radius: var(--radius-xxxl);
+  background: var(--color-auth-surface);
+  color: var(--color-auth-text-primary);
+  font-size: var(--font-size-md);
+  font-weight: 600;
+  cursor: pointer;
+  margin-top: var(--spacing-md);
+  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
+  transition: filter 0.15s ease, transform 0.05s ease, opacity 0.15s ease;
+}
+
+.facebookButton:hover:not(:disabled) {
+  filter: brightness(0.97);
+}
+
+.facebookButton:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+
+.facebookButton:not(:disabled):active {
+  transform: scale(0.98);
+}
+
+.facebookIcon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 20px;
+  height: 20px;
+  flex: 0 0 auto;
+}
+
+.facebookLabel {
+  flex: 1 1 auto;
+  text-align: center;
+}
+
+.spinner {
+  display: inline-block;
+  width: 18px;
+  height: 18px;
+  border-width: 2px;
+  border-style: solid;
+  border-color: var(--color-facebook-blue) transparent transparent transparent;
+  border-radius: 50%;
+  animation: spin 0.8s linear infinite;
+  flex: 0 0 auto;
 }
 
 .linkButton {
+  align-self: center;
   background: none;
   border: none;
-  padding: 0;
-  font-size: var(--font-size-sm);
-  color: var(--color-accent);
-  text-align: center;
+  padding: var(--spacing-md) 0;
+  font-size: var(--font-size-md);
+  color: var(--color-auth-text-primary);
+  text-decoration: underline;
+  text-underline-offset: 3px;
   cursor: pointer;
   transition: opacity 0.15s ease;
 }
 
 .linkButton:hover {
-  opacity: 0.85;
+  opacity: 0.8;
+}
+
+@keyframes spin {
+  to {
+    transform: rotate(360deg);
+  }
 }
diff --git a/src/app/auth/components/auth-facebook-panel.tsx b/src/app/auth/components/auth-facebook-panel.tsx
index b02e7477..4a98a6ca 100644
--- a/src/app/auth/components/auth-facebook-panel.tsx
+++ b/src/app/auth/components/auth-facebook-panel.tsx
@@ -1,24 +1,23 @@
 "use client";
 /**
- * Facebook 面板（默认面板）
+ * Facebook 面板（默认登录面板）
  *
  * 原始 Dart: lib/ui/auth/widgets/auth_facebook_panel.dart
  *
- * 行为：
- *  - 默认显示「Continue with Facebook」+ 「Other sign-in options」入口
- *  - 社交登录直接调 `nextauth.facebookLogin()` / `nextauth.googleLogin()`（NextAuth 流程）
+ * 视觉规格（与 Dart 对齐）：
+ *   - Spacer → logo（120h）→ Spacer → Facebook 主按钮 → 链接 → Spacer → 法律
+ *   - Facebook 主按钮：46px 白胶囊 + Facebook "f" 图标（#1877f2）+ "Login with Facebook"
+ *   - 社交登录走 NextAuth：`facebookLogin()` / `googleLogin()`
+ *   - "Other Sign-in Options" 链接打开底部弹层
+ *   - 弹层 Email 按钮 → 触发 `onSwitchToEmail`（父级派发 `AuthPanelModeChanged`）
  */
 import { useState } from "react";
 
-import { useAuthState } from "@/stores/auth/auth-context";
 import { facebookLogin, googleLogin } from "@/lib/auth/nextauth";
 
-import { AuthSocialButtons } from "./auth-social-buttons";
-import { AuthDivider } from "./auth-divider";
-import { AuthPrimaryButton } from "./auth-primary-button";
 import { AuthErrorMessage } from "./auth-error-message";
-import { AuthOtherOptionsDialog } from "./auth-other-options-dialog";
 import { AuthLegalText } from "./auth-legal-text";
+import { AuthOtherOptionsDialog } from "./auth-other-options-dialog";
 import styles from "./auth-facebook-panel.module.css";
 
 export interface AuthFacebookPanelProps {
@@ -26,65 +25,76 @@ export interface AuthFacebookPanelProps {
 }
 
 export function AuthFacebookPanel({ onSwitchToEmail }: AuthFacebookPanelProps) {
-  const state = useAuthState();
   const [showOptions, setShowOptions] = useState(false);
   const [busy, setBusy] = useState<null | "facebook" | "google">(null);
+  const [error, setError] = useState<string | null>(null);
 
   const handleFacebook = async () => {
     setBusy("facebook");
+    setError(null);
     const r = await facebookLogin();
     setBusy(null);
-    if (!r.success) console.error("[auth-facebook-panel]", r.error);
+    if (!r.success) setError(r.error?.message ?? "Facebook login failed");
   };
 
   const handleGoogle = async () => {
     setBusy("google");
+    setError(null);
     const r = await googleLogin();
     setBusy(null);
-    if (!r.success) console.error("[auth-facebook-panel]", r.error);
+    if (!r.success) setError(r.error?.message ?? "Google login failed");
   };
 
   return (
     <div className={styles.panel}>
-      <AuthErrorMessage message={state.errorMessage} />
-      <AuthSocialButtons
-        loadingProvider={busy ?? (state.isLoading ? "facebook" : null)}
-        onFacebook={handleFacebook}
-        onGoogle={handleGoogle}
+      <div className={styles.spacer} />
+      <img
+        src="/images/auth/ic-logo-login.png"
+        alt="Cozsweet"
+        className={styles.logo}
       />
-      <AuthDivider label="or" />
-      <AuthPrimaryButton onClick={onSwitchToEmail} variant="primary">
-        Continue with Email
-      </AuthPrimaryButton>
+      <div className={styles.spacer} />
+
+      <button
+        type="button"
+        className={styles.facebookButton}
+        onClick={() => void handleFacebook()}
+        disabled={busy !== null}
+      >
+        {busy === "facebook" ? (
+          <span className={styles.spinner} aria-hidden="true" />
+        ) : (
+          <span className={styles.facebookIcon} aria-hidden="true">
+            <svg width="20" height="20" viewBox="0 0 24 24" fill="#1877f2">
+              <path d="M13 22v-8h3l1-4h-4V7.5c0-1.2.4-2 2-2h2V2.2C16.6 2.1 15.5 2 14.3 2 11.5 2 9.5 3.7 9.5 7v3h-3v4h3v8h3.5z" />
+            </svg>
+          </span>
+        )}
+        <span className={styles.facebookLabel}>
+          {busy === "facebook" ? "Logging in..." : "Login with Facebook"}
+        </span>
+      </button>
+
       <button
         type="button"
         className={styles.linkButton}
         onClick={() => setShowOptions(true)}
       >
-        Other sign-in options
+        Other Sign In Options
       </button>
+
+      <div className={styles.spacer} />
+
+      <AuthErrorMessage message={error} />
       <AuthLegalText />
+
       <AuthOtherOptionsDialog
         open={showOptions}
         onClose={() => setShowOptions(false)}
-        onFacebook={() => {
-          setShowOptions(false);
-          void handleFacebook();
-        }}
-        onGoogle={() => {
-          setShowOptions(false);
-          void handleGoogle();
-        }}
-        onApple={() => {
-          setShowOptions(false);
-          console.warn("Apple login not implemented");
-        }}
-        onEmail={() => {
-          setShowOptions(false);
-          onSwitchToEmail();
-        }}
-        loadingProvider={busy ?? (state.isLoading ? "facebook" : null)}
-        showApple={false}
+        mode="facebook"
+        onFacebook={() => void handleFacebook()}
+        onGoogle={() => void handleGoogle()}
+        onEmail={onSwitchToEmail}
       />
     </div>
   );
diff --git a/src/app/auth/components/auth-legal-text.module.css b/src/app/auth/components/auth-legal-text.module.css
index 7d0d29b7..1a6c4a4e 100644
--- a/src/app/auth/components/auth-legal-text.module.css
+++ b/src/app/auth/components/auth-legal-text.module.css
@@ -1,13 +1,53 @@
+/* 原始 Dart: lib/ui/auth/widgets/auth_legal_text.dart
+ *
+ * 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(--font-size-sm);
-  color: var(--color-text-secondary);
-  text-align: center;
-  line-height: 1.5;
+  line-height: 1.4;
+  color: var(--color-auth-text-primary);
+  text-align: left;
+  flex: 1 1 auto;
 }
 
 .link {
-  color: var(--color-accent);
+  color: var(--color-auth-text-primary);
+  font-weight: 700;
   text-decoration: none;
 }
 
diff --git a/src/app/auth/components/auth-legal-text.tsx b/src/app/auth/components/auth-legal-text.tsx
index f25cb333..83079e50 100644
--- a/src/app/auth/components/auth-legal-text.tsx
+++ b/src/app/auth/components/auth-legal-text.tsx
@@ -1,23 +1,57 @@
 "use client";
 /**
- * 法律声明（Terms / Privacy）
+ * 法律声明（Terms / Privacy + 复选框）
  *
  * 原始 Dart: lib/ui/auth/widgets/auth_legal_text.dart
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - 行：16px 白色圆形复选框 + 12px 富文本
+ *   - 复选框：白底 + 1px 白色边框；选中时 10px 粉色实心圆
+ *   - 默认选中（仅视觉，不阻塞提交）
+ *   - 链接加粗（Privacy Policy / Terms of Service）
+ *   - 文字深色
  */
+import { useState } from "react";
+
+import { AppConstants } from "@/core/constants/app_constants";
+
 import styles from "./auth-legal-text.module.css";
 
 export function AuthLegalText() {
+  const [checked, setChecked] = useState(true);
+
   return (
-    <p className={styles.text}>
-      By continuing, you agree to our{" "}
-      <a href="/terms" className={styles.link} target="_blank" rel="noreferrer">
-        Terms
-      </a>{" "}
-      and{" "}
-      <a href="/privacy" className={styles.link} target="_blank" rel="noreferrer">
-        Privacy Policy
-      </a>
-      .
-    </p>
+    <div className={styles.row}>
+      <button
+        type="button"
+        className={styles.checkbox}
+        onClick={() => setChecked((c) => !c)}
+        aria-label="Agree to terms"
+        aria-pressed={checked}
+      >
+        {checked ? <span className={styles.checkboxInner} /> : null}
+      </button>
+      <p className={styles.text}>
+        By continuing, you agree to {AppConstants.appTitle}&apos;s{" "}
+        <a
+          href={AppConstants.privacyPolicyUrl}
+          className={styles.link}
+          target="_blank"
+          rel="noreferrer"
+        >
+          Privacy Policy
+        </a>{" "}
+        and{" "}
+        <a
+          href={AppConstants.termsOfServiceUrl}
+          className={styles.link}
+          target="_blank"
+          rel="noreferrer"
+        >
+          Terms of Service
+        </a>
+        .
+      </p>
+    </div>
   );
 }
diff --git a/src/app/auth/components/auth-other-options-dialog.module.css b/src/app/auth/components/auth-other-options-dialog.module.css
index 6220ba13..c8e6a34d 100644
--- a/src/app/auth/components/auth-other-options-dialog.module.css
+++ b/src/app/auth/components/auth-other-options-dialog.module.css
@@ -1,34 +1,53 @@
+/* 原始 Dart: lib/ui/auth/widgets/auth_other_options_dialog.dart
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - drag handle 40×4 灰胶囊
+ *   - 标题 24px bold 深色居中
+ *   - 选项按钮 40px 白胶囊
+ *   - Cancel 14px 深色居中文本按钮
+ */
 .body {
   display: flex;
   flex-direction: column;
+  align-items: stretch;
   gap: var(--spacing-md);
-  padding: var(--spacing-xl);
+  padding: var(--spacing-md) var(--spacing-xxl)
+    calc(var(--spacing-xxl) + env(safe-area-inset-bottom));
+}
+
+.handle {
+  align-self: center;
+  width: var(--auth-drag-handle-width);
+  height: var(--auth-drag-handle-height);
+  border-radius: 2px;
+  background: var(--color-auth-drag-handle);
+  margin-bottom: var(--spacing-sm);
 }
 
 .title {
-  margin: 0;
-  font-size: var(--font-size-xl);
-  font-weight: 600;
-  color: var(--color-text-primary);
+  margin: var(--spacing-sm) 0;
+  font-size: var(--font-size-bottom-sheet-title);
+  font-weight: 700;
+  color: var(--color-auth-text-primary);
   text-align: center;
 }
 
-.emailButton {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
+.googleSlot {
   width: 100%;
-  height: var(--button-height);
-  padding: 0 var(--spacing-lg);
-  border: var(--border-light) solid var(--color-chat-input-border);
-  border-radius: var(--radius-full);
-  background: transparent;
-  color: var(--color-text-primary);
-  font-size: var(--font-size-md);
-  cursor: pointer;
-  transition: background 0.15s ease;
 }
 
-.emailButton:hover {
-  background: rgba(255, 255, 255, 0.06);
+.cancel {
+  align-self: center;
+  background: none;
+  border: none;
+  padding: var(--spacing-md) 0;
+  color: var(--color-auth-text-primary);
+  font-size: var(--font-size-md);
+  font-weight: 500;
+  cursor: pointer;
+  text-decoration: none;
+}
+
+.cancel:hover {
+  text-decoration: underline;
 }
diff --git a/src/app/auth/components/auth-other-options-dialog.tsx b/src/app/auth/components/auth-other-options-dialog.tsx
index cd8565c5..69183253 100644
--- a/src/app/auth/components/auth-other-options-dialog.tsx
+++ b/src/app/auth/components/auth-other-options-dialog.tsx
@@ -1,12 +1,23 @@
 "use client";
 /**
- * "其他登录方式" 弹窗
+ * "其他登录方式" 底部弹层
  *
  * 原始 Dart: lib/ui/auth/widgets/auth_other_options_dialog.dart
+ *   (showModalBottomSheet：白卡 + 顶部圆角 radius28 + drag handle)
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - 固定底部、宽 100%（≤500px）、顶部圆角 28px
+ *   - drag handle 40×4 灰胶囊
+ *   - 标题 "Other Sign-in Options" 24px bold 深色
+ *   - 条件渲染 Email / Facebook 按钮（40px 白胶囊 + 边框 + 图标）
+ *   - 始终渲染 Google 按钮
+ *   - Cancel 文本按钮
  */
-import { Dialog } from "@/app/_components/core/dialog";
-import { AuthSocialButtons } from "./auth-social-buttons";
-import { AuthDivider } from "./auth-divider";
+import type { ReactNode } from "react";
+
+import { BottomSheet } from "@/app/_components/core/bottom-sheet";
+
+import { AuthSocialButton } from "./auth-social-button";
 import styles from "./auth-other-options-dialog.module.css";
 
 export interface AuthOtherOptionsDialogProps {
@@ -14,11 +25,11 @@ export interface AuthOtherOptionsDialogProps {
   onClose: () => void;
   onFacebook: () => void;
   onGoogle: () => void;
-  onApple?: () => void;
   onEmail: () => void;
-  loadingProvider?: "facebook" | "google" | "apple" | null;
-  showApple?: boolean;
-  googleSlot?: React.ReactNode;
+  /** 当前面板模式：facebook 模式下显示 Email + Google；email 模式下显示 Facebook + Google。 */
+  mode: "facebook" | "email";
+  /** 自定义子节点（如嵌入 GIS 按钮） */
+  googleSlot?: ReactNode;
 }
 
 export function AuthOtherOptionsDialog({
@@ -26,29 +37,99 @@ export function AuthOtherOptionsDialog({
   onClose,
   onFacebook,
   onGoogle,
-  onApple,
   onEmail,
-  loadingProvider,
-  showApple,
+  mode,
   googleSlot,
 }: AuthOtherOptionsDialogProps) {
   return (
-    <Dialog open={open} onClose={onClose} ariaLabel="Other sign-in options">
+    <BottomSheet
+      open={open}
+      onClose={onClose}
+      ariaLabel="Other sign-in options"
+    >
       <div className={styles.body}>
+        <div className={styles.handle} aria-hidden="true" />
         <h2 className={styles.title}>Other Sign-in Options</h2>
-        <AuthSocialButtons
-          onFacebook={onFacebook}
-          onGoogle={onGoogle}
-          onApple={onApple}
-          loadingProvider={loadingProvider}
-          showApple={showApple}
-          googleSlot={googleSlot}
-        />
-        <AuthDivider label="or" />
-        <button type="button" className={styles.emailButton} onClick={onEmail}>
-          Continue with Email
+
+        {mode === "facebook" ? (
+          <AuthSocialButton
+            icon={
+              <svg
+                width="20"
+                height="20"
+                viewBox="0 0 24 24"
+                fill="currentColor"
+                aria-hidden="true"
+              >
+                <path d="M20 4H4c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V6c0-1.1-.9-2-2-2zm0 4-8 5-8-5V6l8 5 8-5v2z" />
+              </svg>
+            }
+            onClick={() => {
+              onClose();
+              onEmail();
+            }}
+          >
+            Email Sign In / Register
+          </AuthSocialButton>
+        ) : (
+          <AuthSocialButton
+            icon={
+              <svg
+                width="20"
+                height="20"
+                viewBox="0 0 24 24"
+                fill="var(--color-facebook-blue)"
+                aria-hidden="true"
+              >
+                <path d="M13 22v-8h3l1-4h-4V7.5c0-1.2.4-2 2-2h2V2.2C16.6 2.1 15.5 2 14.3 2 11.5 2 9.5 3.7 9.5 7v3h-3v4h3v8h3.5z" />
+              </svg>
+            }
+            onClick={() => {
+              onClose();
+              onFacebook();
+            }}
+          >
+            Facebook Sign In
+          </AuthSocialButton>
+        )}
+
+        {googleSlot ? (
+          <div className={styles.googleSlot}>{googleSlot}</div>
+        ) : (
+          <AuthSocialButton
+            icon={
+              <svg width="20" height="20" viewBox="0 0 24 24" aria-hidden="true">
+                <path
+                  d="M22 12.2c0-.7-.1-1.4-.2-2H12v3.8h5.6c-.2 1.3-1 2.4-2 3.1v2.6h3.2c1.9-1.7 2.9-4.2 2.9-7.5z"
+                  fill="#4285F4"
+                />
+                <path
+                  d="M12 22c2.7 0 4.9-.9 6.5-2.4l-3.2-2.5c-.9.6-2 1-3.3 1-2.6 0-4.7-1.7-5.5-4.1H3.2v2.5C4.8 19.7 8.1 22 12 22z"
+                  fill="#34A853"
+                />
+                <path
+                  d="M6.5 14a6 6 0 010-3.9V7.5H3.2a10 10 0 000 9l3.3-2.5z"
+                  fill="#FBBC05"
+                />
+                <path
+                  d="M12 5.9c1.5 0 2.8.5 3.8 1.5l2.9-2.9C16.9 2.9 14.7 2 12 2 8.1 2 4.8 4.3 3.2 7.5L6.5 10c.8-2.4 2.9-4.1 5.5-4.1z"
+                  fill="#EA4335"
+                />
+              </svg>
+            }
+            onClick={() => {
+              onClose();
+              onGoogle();
+            }}
+          >
+            Continue with Google
+          </AuthSocialButton>
+        )}
+
+        <button type="button" className={styles.cancel} onClick={onClose}>
+          Cancel
         </button>
       </div>
-    </Dialog>
+    </BottomSheet>
   );
 }
diff --git a/src/app/auth/components/auth-panel.module.css b/src/app/auth/components/auth-panel.module.css
index 4e492bd2..2011d5ac 100644
--- a/src/app/auth/components/auth-panel.module.css
+++ b/src/app/auth/components/auth-panel.module.css
@@ -1,7 +1,42 @@
-.panel {
+/* 原始 Dart: lib/ui/auth/widgets/auth_panel.dart
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - panelShell 包裹整个面板（position: relative）
+ *   - 悬浮返回按钮：40×40 白色圆形 + 淡黑阴影，固定 top/left 20px
+ */
+.panelShell {
+  position: relative;
+  flex: 1 1 auto;
   display: flex;
   flex-direction: column;
-  gap: var(--spacing-lg);
   width: 100%;
-  padding: var(--spacing-xl);
+  min-height: 0;
+}
+
+.backButton {
+  position: absolute;
+  top: var(--spacing-xl);
+  left: var(--spacing-xl);
+  z-index: 2;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: var(--auth-back-button-size);
+  height: var(--auth-back-button-size);
+  border: none;
+  border-radius: 50%;
+  background: var(--color-auth-surface);
+  color: var(--color-auth-text-primary);
+  padding: 0 2px 0 0;
+  cursor: pointer;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+  transition: background 0.15s ease, transform 0.05s ease;
+}
+
+.backButton:hover {
+  background: rgba(0, 0, 0, 0.04);
+}
+
+.backButton:active {
+  transform: scale(0.96);
 }
diff --git a/src/app/auth/components/auth-panel.tsx b/src/app/auth/components/auth-panel.tsx
index 58a7d372..ab763606 100644
--- a/src/app/auth/components/auth-panel.tsx
+++ b/src/app/auth/components/auth-panel.tsx
@@ -1,30 +1,74 @@
 "use client";
 /**
- * 认证面板：顶层 switch（Facebook / Email）
+ * 认证面板：顶层 switch（Facebook / Email）+ 悬浮返回按钮
  *
  * 原始 Dart: lib/ui/auth/widgets/auth_panel.dart
+ *
+ * 行为对齐：
+ *   - 状态机：`authPanelMode`（"facebook" | "email"）由 XState 管理
+ *   - 切换派发 `AuthPanelModeChanged`
+ *   - 悬浮返回按钮（40×40 白圆，top:20, left:20）：
+ *     - facebook 模式：`router.back()`
+ *     - email 模式：派发 `AuthPanelModeChanged(facebook)`
+ *   - Email 面板的弹层 Facebook 按钮同样派发 `AuthPanelModeChanged(facebook)`
  */
-import { useAuthState } from "@/stores/auth/auth-context";
+import { useRouter } from "next/navigation";
+
+import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
 
-import { AuthFacebookPanel } from "./auth-facebook-panel";
 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();
+  const dispatch = useAuthDispatch();
+  const router = useRouter();
+
+  const switchToEmail = () =>
+    dispatch({ type: "AuthPanelModeChanged", mode: "email" });
+  const switchToFacebook = () =>
+    dispatch({ type: "AuthPanelModeChanged", mode: "facebook" });
+
+  const handleBack = () => {
+    if (state.authPanelMode === "email") {
+      switchToFacebook();
+    } else {
+      router.back();
+    }
+  };
+
   return (
-    <div className={styles.panel}>
+    <div className={styles.panelShell}>
+      <button
+        type="button"
+        className={styles.backButton}
+        onClick={handleBack}
+        aria-label="Back"
+      >
+        <svg
+          width="20"
+          height="20"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          strokeWidth="2.5"
+          strokeLinecap="round"
+          strokeLinejoin="round"
+          aria-hidden="true"
+        >
+          <path d="M15 18l-6-6 6-6" />
+        </svg>
+      </button>
+
       {state.authPanelMode === "facebook" ? (
-        <AuthFacebookPanel
-          onSwitchToEmail={() => {
-            // 切换模式由外部 dispatch 触发；这里不直接处理
-            // 因为 auth-panel 受 `authPanelMode` 控制，调用方需要 dispatch `AuthPanelModeChanged`
-            // 但我们目前 AuthFacebookPanel 内部 click "Continue with Email" 直接调用 onSwitchToEmail
-            // 实际上本组件直接渲染对应 panel
+        <AuthFacebookPanel onSwitchToEmail={switchToEmail} />
+      ) : (
+        <AuthEmailPanel
+          onSwitchToFacebook={() => {
+            switchToFacebook();
           }}
         />
-      ) : (
-        <AuthEmailPanel onBack={() => undefined} />
       )}
     </div>
   );
diff --git a/src/app/auth/components/auth-primary-button.module.css b/src/app/auth/components/auth-primary-button.module.css
index 481bf6bc..2d2fcf6f 100644
--- a/src/app/auth/components/auth-primary-button.module.css
+++ b/src/app/auth/components/auth-primary-button.module.css
@@ -1,22 +1,37 @@
+/* 原始 Dart: lib/ui/auth/widgets/auth_primary_button.dart
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - 46px 高
+ *   - 粉渐变（#f96ADE → #f657A0，左→右）
+ *   - 半径 24
+ *   - 20% 红阴影（#d00c41 @ 20%）
+ *   - 文字 16px bold 白色
+ */
 .button {
   display: inline-flex;
   align-items: center;
   justify-content: center;
   gap: var(--spacing-sm);
   width: 100%;
-  height: var(--button-height);
+  height: var(--auth-field-height);
   padding: 0 var(--spacing-lg);
   border: none;
-  border-radius: var(--radius-full);
-  font-size: var(--font-size-md);
-  font-weight: 600;
-  color: var(--color-text-primary);
+  border-radius: var(--radius-xxxl);
+  background: linear-gradient(
+    90deg,
+    var(--color-auth-primary-gradient-start),
+    var(--color-auth-primary-gradient-end)
+  );
+  box-shadow: 0 3px 5px var(--color-auth-primary-button-shadow);
+  color: #ffffff;
+  font-size: var(--font-size-lg);
+  font-weight: 700;
   cursor: pointer;
-  transition: opacity 0.15s ease, transform 0.05s ease;
+  transition: filter 0.15s ease, transform 0.05s ease, opacity 0.15s ease;
 }
 
 .button:disabled {
-  opacity: 0.6;
+  opacity: 0.7;
   cursor: not-allowed;
 }
 
@@ -24,25 +39,18 @@
   transform: scale(0.98);
 }
 
-.accent {
-  background: linear-gradient(
-    90deg,
-    var(--color-accent),
-    var(--color-facebook-button-gradient-end)
-  );
-}
-
-.primary {
-  background: var(--color-primary);
+.label {
+  flex: 1 1 auto;
+  text-align: center;
 }
 
 .spinner {
   display: inline-block;
-  width: 16px;
-  height: 16px;
+  width: 18px;
+  height: 18px;
   border-width: 2px;
   border-style: solid;
-  border-color: currentColor transparent transparent transparent;
+  border-color: #ffffff transparent transparent transparent;
   border-radius: 50%;
   animation: spin 0.8s linear infinite;
 }
diff --git a/src/app/auth/components/auth-primary-button.tsx b/src/app/auth/components/auth-primary-button.tsx
index 1914ab94..a85f50dd 100644
--- a/src/app/auth/components/auth-primary-button.tsx
+++ b/src/app/auth/components/auth-primary-button.tsx
@@ -1,8 +1,15 @@
 "use client";
 /**
- * 认证主按钮（粉/蓝渐变）
+ * 认证主按钮（粉渐变，46px）
  *
  * 原始 Dart: lib/ui/auth/widgets/auth_primary_button.dart
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - 46px 高
+ *   - 粉渐变（#f96ADE → #f657A0）
+ *   - 半径 24
+ *   - 20% 红阴影（#d00c41 @ 20%）
+ *   - 文字 16px bold 白色
  */
 import { type ButtonHTMLAttributes, type ReactNode } from "react";
 
@@ -12,28 +19,21 @@ export interface AuthPrimaryButtonProps
   extends Omit<ButtonHTMLAttributes<HTMLButtonElement>, "children"> {
   isLoading?: boolean;
   children: ReactNode;
-  variant?: "accent" | "primary";
 }
 
 export function AuthPrimaryButton({
   isLoading,
   children,
-  variant = "accent",
   disabled,
   className,
+  type = "button",
   ...rest
 }: AuthPrimaryButtonProps) {
   return (
     <button
-      type="button"
+      type={type}
       disabled={disabled || isLoading}
-      className={[
-        styles.button,
-        styles[variant],
-        className,
-      ]
-        .filter(Boolean)
-        .join(" ")}
+      className={[styles.button, className].filter(Boolean).join(" ")}
       {...rest}
     >
       {isLoading ? (
diff --git a/src/app/auth/components/auth-screen.module.css b/src/app/auth/components/auth-screen.module.css
new file mode 100644
index 00000000..67485eb0
--- /dev/null
+++ b/src/app/auth/components/auth-screen.module.css
@@ -0,0 +1,23 @@
+/* 原始 Dart: lib/ui/auth/auth_screen.dart
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - 全屏 `bg_login.png` 背景（cover）
+ *   - 500px 内容列由 MobileShell 约束
+ *   - 内容列居中
+ */
+.fullBleed {
+  position: relative;
+  flex: 1 1 auto;
+  display: flex;
+  flex-direction: column;
+  min-height: 100dvh;
+  background: url("/images/auth/bg-login.png") center / cover no-repeat;
+}
+
+.content {
+  flex: 1 1 auto;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  padding: var(--spacing-lg);
+}
diff --git a/src/app/auth/components/auth-screen.tsx b/src/app/auth/components/auth-screen.tsx
index 4649f4a9..17c360ab 100644
--- a/src/app/auth/components/auth-screen.tsx
+++ b/src/app/auth/components/auth-screen.tsx
@@ -5,10 +5,11 @@
  * 原始 Dart: lib/ui/auth/auth_screen.dart
  *
  * 行为对齐：
- *  - 500px 移动端宽度（MobileShell）
- *  - 已登录用户：自动跳 /chat
- *  - 未登录：渲染 AuthPanel（含 Facebook/Email 两种面板）
- *  - 登录成功：通知 ChatBloc + UserBloc，然后 router.replace(/chat)
+ *   - 500px 移动端宽度（MobileShell）
+ *   - 全屏 `bg_login.png` 背景（cover 模式，扩展到 viewport）
+ *   - 已登录用户：自动跳 /chat
+ *   - 未登录：渲染 AuthPanel（含 Facebook/Email 两种面板）
+ *   - 登录成功：通知 ChatBloc + UserBloc，然后 router.replace(/chat)
  */
 import { useEffect, useRef } from "react";
 import { useRouter } from "next/navigation";
@@ -20,14 +21,9 @@ import { ROUTES } from "@/router/routes";
 import { MobileShell } from "@/app/_components/core/mobile-shell";
 import { AuthPanel } from "@/app/auth/components/auth-panel";
 
-export interface AuthScreenProps {
-  /** 自定义背景（默认紫粉渐变）。 */
-  background?: string;
-}
+import styles from "./auth-screen.module.css";
 
-export function AuthScreen({
-  background = "var(--color-sidebar-background)",
-}: AuthScreenProps) {
+export function AuthScreen() {
   // ===== 鉴权路由跳转已由 src/router/proxy.ts 集中处理 =====
   // 本组件只负责：
   //   1. 渲染登录面板
@@ -50,18 +46,12 @@ export function AuthScreen({
   }, [state.isSuccess, chatDispatch, userDispatch, router]);
 
   return (
-    <MobileShell background={background}>
-      <div
-        style={{
-          flex: 1,
-          display: "flex",
-          flexDirection: "column",
-          justifyContent: "center",
-          padding: "var(--spacing-lg)",
-        }}
-      >
-        <AuthPanel />
-      </div>
-    </MobileShell>
+    <div className={styles.fullBleed}>
+      <MobileShell>
+        <div className={styles.content}>
+          <AuthPanel />
+        </div>
+      </MobileShell>
+    </div>
   );
 }
diff --git a/src/app/auth/components/auth-social-button.module.css b/src/app/auth/components/auth-social-button.module.css
index fd3049c7..36b41014 100644
--- a/src/app/auth/components/auth-social-button.module.css
+++ b/src/app/auth/components/auth-social-button.module.css
@@ -1,23 +1,33 @@
+/* 原始 Dart: lib/ui/auth/widgets/auth_social_button.dart
+ *
+ * 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-sm);
+  gap: var(--spacing-md);
   width: 100%;
-  height: var(--button-height);
+  height: var(--auth-social-button-height);
   padding: 0 var(--spacing-lg);
-  border: var(--border-light) solid var(--color-chat-input-border);
-  border-radius: var(--radius-full);
-  background: rgba(255, 255, 255, 0.04);
-  color: var(--color-text-primary);
+  border: 1px solid var(--color-auth-border);
+  border-radius: var(--radius-xxl);
+  background: var(--color-auth-surface);
+  color: var(--color-auth-text-primary);
   font-size: var(--font-size-md);
   font-weight: 500;
   cursor: pointer;
-  transition: background 0.15s ease, border-color 0.15s ease;
+  transition: background 0.15s ease, opacity 0.15s ease;
 }
 
 .button:hover:not(:disabled) {
-  background: rgba(255, 255, 255, 0.08);
+  background: rgba(0, 0, 0, 0.02);
 }
 
 .button:disabled {
@@ -31,22 +41,7 @@
   justify-content: center;
   width: 20px;
   height: 20px;
-}
-
-.facebook {
-  background: var(--color-facebook-blue);
-  border-color: transparent;
-}
-
-.google {
-  background: #ffffff;
-  color: #1f1f1f;
-  border-color: transparent;
-}
-
-.apple {
-  background: #000000;
-  border-color: #ffffff;
+  flex: 0 0 auto;
 }
 
 .label {
diff --git a/src/app/auth/components/auth-social-button.tsx b/src/app/auth/components/auth-social-button.tsx
index 37280150..760d08fc 100644
--- a/src/app/auth/components/auth-social-button.tsx
+++ b/src/app/auth/components/auth-social-button.tsx
@@ -1,10 +1,21 @@
 "use client";
 /**
- * 社交登录按钮
+ * 社交/选项登录按钮（用于底部弹层）
  *
  * 原始 Dart: lib/ui/auth/widgets/auth_social_button.dart
+ *
+ * 视觉规格（与 Dart 弹层按钮对齐）：
+ *   - 40px 高
+ *   - 白底 + 1px 边框 `--color-auth-border`
+ *   - 半径 20
+ *   - 无阴影
+ *   - 图标 20×20 + 标签
+ *   - 14px 文字深色
  */
-import { type ButtonHTMLAttributes, type ReactNode } from "react";
+import {
+  type ButtonHTMLAttributes,
+  type ReactNode,
+} from "react";
 
 import styles from "./auth-social-button.module.css";
 
@@ -12,24 +23,21 @@ export interface AuthSocialButtonProps
   extends Omit<ButtonHTMLAttributes<HTMLButtonElement>, "children"> {
   icon?: ReactNode;
   children: ReactNode;
-  variant?: "facebook" | "google" | "apple" | "default";
 }
 
 export function AuthSocialButton({
   icon,
   children,
-  variant = "default",
   disabled,
   className,
+  type = "button",
   ...rest
 }: AuthSocialButtonProps) {
   return (
     <button
-      type="button"
+      type={type}
       disabled={disabled}
-      className={[styles.button, styles[variant], className]
-        .filter(Boolean)
-        .join(" ")}
+      className={[styles.button, className].filter(Boolean).join(" ")}
       {...rest}
     >
       {icon ? <span className={styles.icon}>{icon}</span> : null}
diff --git a/src/app/auth/components/auth-text-field.module.css b/src/app/auth/components/auth-text-field.module.css
index bec6910e..63e9c7a1 100644
--- a/src/app/auth/components/auth-text-field.module.css
+++ b/src/app/auth/components/auth-text-field.module.css
@@ -1,3 +1,13 @@
+/* 原始 Dart: lib/ui/auth/widgets/auth_text_field.dart
+ *
+ * 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;
@@ -12,32 +22,35 @@
 
 .input {
   width: 100%;
-  height: var(--button-height);
-  padding: 0 var(--spacing-lg);
-  border: var(--border-light) solid var(--color-chat-input-border);
-  border-radius: var(--radius-lg);
-  background: rgba(255, 255, 255, 0.04);
-  color: var(--color-text-primary);
+  height: var(--auth-field-height);
+  padding: 0 var(--spacing-lg) 0 var(--spacing-xxl);
+  border: none;
+  border-radius: var(--radius-xxxl);
+  background: var(--color-auth-surface);
+  color: var(--color-auth-text-primary);
   font-size: var(--font-size-md);
+  box-shadow: 0 3px 5px var(--color-auth-input-shadow);
   outline: none;
-  transition: border-color 0.15s ease, box-shadow 0.15s ease;
+  transition: box-shadow 0.15s ease;
 }
 
 .input::placeholder {
-  color: var(--color-input-placeholder);
+  color: var(--color-auth-input-placeholder);
 }
 
 .input:focus {
-  border-color: var(--color-accent);
-  box-shadow: 0 0 0 3px rgba(248, 77, 150, 0.18);
+  box-shadow: 0 3px 5px var(--color-auth-input-shadow),
+    0 0 0 2px var(--color-accent);
 }
 
 .invalid {
-  border-color: var(--color-error);
+  box-shadow: 0 3px 5px rgba(255, 77, 79, 0.18),
+    0 0 0 1px var(--color-error);
 }
 
 .invalid:focus {
-  box-shadow: 0 0 0 3px rgba(255, 77, 79, 0.18);
+  box-shadow: 0 3px 5px rgba(255, 77, 79, 0.18),
+    0 0 0 2px var(--color-error);
 }
 
 .error {
diff --git a/src/app/auth/components/email-form.module.css b/src/app/auth/components/email-form.module.css
index 44e06848..c06e9c28 100644
--- a/src/app/auth/components/email-form.module.css
+++ b/src/app/auth/components/email-form.module.css
@@ -1,26 +1,14 @@
+/* 邮箱登录/注册表单样式
+ *
+ * 原始 Dart: lib/ui/auth/widgets/email_login_form.dart
+ *
+ * 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%;
 }
-
-.linkButton {
-  background: none;
-  border: none;
-  padding: 0;
-  font-size: var(--font-size-sm);
-  color: var(--color-text-secondary);
-  text-align: center;
-  cursor: pointer;
-  transition: color 0.15s ease;
-}
-
-.linkButton:hover {
-  color: var(--color-text-primary);
-}
-
-.link {
-  color: var(--color-accent);
-  font-weight: 600;
-}
diff --git a/src/app/auth/components/email-login-form.tsx b/src/app/auth/components/email-login-form.tsx
index 5ce3fa93..f0d067f7 100644
--- a/src/app/auth/components/email-login-form.tsx
+++ b/src/app/auth/components/email-login-form.tsx
@@ -3,6 +3,13 @@
  * 邮箱登录表单
  *
  * 原始 Dart: lib/ui/auth/widgets/email_login_form.dart
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - 字段无 label（仅 placeholder）
+ *   - 错误仅以红色横幅显示（AuthErrorMessage），无字段级错误
+ *   - 不显示 "Forgot password?" 链接
+ *   - 切换链接由父级 AuthEmailPanel 渲染
+ *   - 提交派发 `AuthEmailLoginSubmitted`
  */
 import { useState } from "react";
 
@@ -18,33 +25,22 @@ import { AuthErrorMessage } from "./auth-error-message";
 import styles from "./email-form.module.css";
 
 export interface EmailLoginFormProps {
-  onSwitchToRegister: () => void;
-  onForgotPassword?: () => void;
   globalError?: string | null;
   isLoading?: boolean;
 }
 
 export function EmailLoginForm({
-  onSwitchToRegister,
-  onForgotPassword,
   globalError,
   isLoading,
 }: EmailLoginFormProps) {
   const dispatch = useAuthDispatch();
   const [email, setEmail] = useState("");
   const [password, setPassword] = useState("");
-  const [errors, setErrors] = useState<{ email?: string; password?: string }>(
-    {},
-  );
 
   const submit = () => {
     const emailErr = validateEmail(email);
     const passwordErr = validatePassword(password);
-    if (emailErr || passwordErr) {
-      setErrors({ email: emailErr ?? undefined, password: passwordErr ?? undefined });
-      return;
-    }
-    setErrors({});
+    if (emailErr || passwordErr) return;
     dispatch({ type: "AuthEmailLoginSubmitted", email, password });
   };
 
@@ -56,45 +52,25 @@ export function EmailLoginForm({
         submit();
       }}
     >
-      <AuthErrorMessage message={globalError ?? null} />
       <AuthTextField
-        label="Email"
         type="email"
         value={email}
         onChange={setEmail}
-        placeholder="you@example.com"
+        placeholder="Email"
         autoComplete="email"
-        errorMessage={errors.email ?? null}
       />
       <AuthTextField
-        label="Password"
         type="password"
         value={password}
         onChange={setPassword}
-        placeholder="••••••••"
+        placeholder="Password"
         autoComplete="current-password"
-        errorMessage={errors.password ?? null}
         onSubmit={submit}
       />
-      {onForgotPassword ? (
-        <button
-          type="button"
-          className={styles.linkButton}
-          onClick={onForgotPassword}
-        >
-          Forgot password?
-        </button>
-      ) : null}
+      <AuthErrorMessage message={globalError ?? null} />
       <AuthPrimaryButton type="submit" isLoading={isLoading}>
-        Log In
+        Login
       </AuthPrimaryButton>
-      <button
-        type="button"
-        className={styles.linkButton}
-        onClick={onSwitchToRegister}
-      >
-        Don&apos;t have an account? <span className={styles.link}>Sign up</span>
-      </button>
     </form>
   );
 }
diff --git a/src/app/auth/components/email-register-form.tsx b/src/app/auth/components/email-register-form.tsx
index 617b126d..a47902f7 100644
--- a/src/app/auth/components/email-register-form.tsx
+++ b/src/app/auth/components/email-register-form.tsx
@@ -3,6 +3,13 @@
  * 邮箱注册表单
  *
  * 原始 Dart: lib/ui/auth/widgets/email_register_form.dart
+ *
+ * 视觉规格（与 Dart 对齐）：
+ *   - 4 字段：username / email / password / confirmPassword（顺序与 Dart 一致）
+ *   - 字段无 label（仅 placeholder）
+ *   - 错误仅以红色横幅显示（AuthErrorMessage），无字段级错误
+ *   - 切换链接由父级 AuthEmailPanel 渲染
+ *   - 提交派发 `AuthEmailRegisterSubmitted`
  */
 import { useState } from "react";
 
@@ -20,13 +27,11 @@ import { AuthErrorMessage } from "./auth-error-message";
 import styles from "./email-form.module.css";
 
 export interface EmailRegisterFormProps {
-  onSwitchToLogin: () => void;
   globalError?: string | null;
   isLoading?: boolean;
 }
 
 export function EmailRegisterForm({
-  onSwitchToLogin,
   globalError,
   isLoading,
 }: EmailRegisterFormProps) {
@@ -35,25 +40,13 @@ export function EmailRegisterForm({
   const [password, setPassword] = useState("");
   const [username, setUsername] = useState("");
   const [confirmPassword, setConfirmPassword] = useState("");
-  const [errors, setErrors] = useState<
-    Partial<Record<"email" | "password" | "username" | "confirmPassword", string>>
-  >({});
 
   const submit = () => {
     const emailErr = validateEmail(email);
     const passwordErr = validatePassword(password);
     const usernameErr = validateUsername(username);
     const confirmErr = validateConfirmPassword(password, confirmPassword);
-    if (emailErr || passwordErr || usernameErr || confirmErr) {
-      setErrors({
-        email: emailErr ?? undefined,
-        password: passwordErr ?? undefined,
-        username: usernameErr ?? undefined,
-        confirmPassword: confirmErr ?? undefined,
-      });
-      return;
-    }
-    setErrors({});
+    if (emailErr || passwordErr || usernameErr || confirmErr) return;
     dispatch({
       type: "AuthEmailRegisterSubmitted",
       email,
@@ -71,53 +64,38 @@ export function EmailRegisterForm({
         submit();
       }}
     >
-      <AuthErrorMessage message={globalError ?? null} />
       <AuthTextField
-        label="Username"
         value={username}
         onChange={setUsername}
-        placeholder="cozsweet_user"
+        placeholder="Username"
         autoComplete="username"
-        errorMessage={errors.username ?? null}
       />
       <AuthTextField
-        label="Email"
         type="email"
         value={email}
         onChange={setEmail}
-        placeholder="you@example.com"
+        placeholder="Email"
         autoComplete="email"
-        errorMessage={errors.email ?? null}
       />
       <AuthTextField
-        label="Password"
         type="password"
         value={password}
         onChange={setPassword}
-        placeholder="••••••••"
+        placeholder="Password"
         autoComplete="new-password"
-        errorMessage={errors.password ?? null}
       />
       <AuthTextField
-        label="Confirm Password"
         type="password"
         value={confirmPassword}
         onChange={setConfirmPassword}
-        placeholder="••••••••"
+        placeholder="Confirm Password"
         autoComplete="new-password"
-        errorMessage={errors.confirmPassword ?? null}
         onSubmit={submit}
       />
+      <AuthErrorMessage message={globalError ?? null} />
       <AuthPrimaryButton type="submit" isLoading={isLoading}>
-        Create Account
+        Register
       </AuthPrimaryButton>
-      <button
-        type="button"
-        className={styles.linkButton}
-        onClick={onSwitchToLogin}
-      >
-        Already have an account? <span className={styles.link}>Log in</span>
-      </button>
     </form>
   );
 }
diff --git a/src/tokens/colors.css b/src/tokens/colors.css
index be8e703b..6af14f1d 100644
--- a/src/tokens/colors.css
+++ b/src/tokens/colors.css
@@ -53,4 +53,34 @@
 
   /* 半透明 / 模糊 */
   --color-blur-background: rgba(13, 11, 20, 0.85);
+
+  /* ==================== Auth 页专用（与 Dart auth_screen.dart 对齐） ==================== */
+  /* 浅色表面（Auth 页内容卡片 / 弹层背景） */
+  --color-auth-surface: #ffffff;
+
+  /* 弹层内第三方登录按钮边框 */
+  --color-auth-border: #d5d7db;
+
+  /* Auth 页输入框占位符 */
+  --color-auth-input-placeholder: #999999;
+
+  /* Auth 页文字主色（深色，区别于全局白字） */
+  --color-auth-text-primary: #333333;
+  --color-auth-text-secondary: #9e9e9e;
+
+  /* Auth 输入框阴影（accent #f759a8 10% 透明） */
+  --color-auth-input-shadow: rgba(247, 89, 168, 0.10);
+
+  /* Auth 主按钮阴影（#d00c41 20% 透明） */
+  --color-auth-primary-button-shadow: rgba(208, 12, 65, 0.20);
+
+  /* Auth 主按钮渐变（与 Dart primaryGradient 对齐） */
+  --color-auth-primary-gradient-start: #f96ade;
+  --color-auth-primary-gradient-end: #f657a0;
+
+  /* Legal 复选框选中点 */
+  --color-auth-legal-check: #f657a0;
+
+  /* 底部弹层 drag handle */
+  --color-auth-drag-handle: #3a3a3a;
 }
diff --git a/src/tokens/dimensions.css b/src/tokens/dimensions.css
index c32e00a3..341a1763 100644
--- a/src/tokens/dimensions.css
+++ b/src/tokens/dimensions.css
@@ -32,4 +32,31 @@
   /* 聊天媒体 */
   --chat-media-max-width: 240px;
   --chat-media-max-height: 240px;
+
+  /* ==================== Auth 页尺寸（与 Dart AppDimensions / Spacing 对齐） ==================== */
+  /* 输入框 / 主按钮高度（46px = Dart AppDimensions.height46） */
+  --auth-field-height: 46px;
+
+  /* 弹层内第三方登录按钮高度（40px） */
+  --auth-social-button-height: 40px;
+
+  /* 主按钮固定宽度（Dart AppDimensions.buttonWidth = 334） */
+  --auth-primary-button-width: 334px;
+
+  /* Logo 高度（120px） */
+  --auth-logo-height: 120px;
+
+  /* Legal 圆形复选框 */
+  --auth-legal-checkbox-size: 16px;
+  --auth-legal-checkbox-inner-size: 10px;
+
+  /* 悬浮返回按钮（40×40 圆形） */
+  --auth-back-button-size: 40px;
+
+  /* 底部弹层圆角（28px = Dart AppRadius.radius28） */
+  --auth-bottom-sheet-radius: 28px;
+
+  /* 弹层 drag handle（40×4 胶囊） */
+  --auth-drag-handle-width: 40px;
+  --auth-drag-handle-height: 4px;
 }
diff --git a/src/tokens/radius.css b/src/tokens/radius.css
index f96096c8..75998fb5 100644
--- a/src/tokens/radius.css
+++ b/src/tokens/radius.css
@@ -10,4 +10,5 @@
   --radius-xxl: 20px;
   --radius-xxxl: 24px;
   --radius-full: 999px;
+  --radius-bottom-sheet: 28px;
 }
diff --git a/src/tokens/typography.css b/src/tokens/typography.css
index c4efb0d9..320c436f 100644
--- a/src/tokens/typography.css
+++ b/src/tokens/typography.css
@@ -28,4 +28,7 @@
   /* 扩展字号（迁移自 Flutter widgets） */
   --font-size-22: 22px;
   --font-size-26: 26px;
+
+  /* Auth 底部弹层标题（24px bold） */
+  --font-size-bottom-sheet-title: 24px;
 }