feat(auth): redesign auth screens with clean form style and add welcome page

- Replace split/responsive layout with unified clean form design
- Update LoginScreen, RegisterScreen, and ForgotPasswordScreen styles
- Add WelcomeScreen as new entry point for unauthenticated users
- Redirect unauthenticated users to /welcome instead of /login
- Add hrefAuthWelcome() navigation helper

BREAKING CHANGE: Auth screens no longer support split layout, unified mobile-first design

app/index.tsx

@@ -7,5 +7,5 @@ export default function Index() {
   if (isAuthenticated) {
     return <Redirect href="/home" />;
   }
-  return <Redirect href="/login" />;
+  return <Redirect href="/welcome" />;
 }

app/welcome.tsx

@@ -0,0 +1,5 @@
+import { WelcomeScreen } from '../src/screens/auth';
+
+export default function WelcomeRoute() {
+  return <WelcomeScreen />;
+}

src/navigation/hrefs.ts

@@ -156,6 +156,10 @@ export function hrefAuthForgot(): string {
   return '/forgot-password';
 }
 
+export function hrefAuthWelcome(): string {
+  return '/welcome';
+}
+
 // ==================== Materials (学习资料) ====================
 
 export function hrefMaterials(): string {

src/screens/auth/ForgotPasswordScreen.tsx

@@ -1,4 +1,15 @@
-import React, { useEffect, useMemo, useState } from 'react';
+/**
+ * 忘记密码页 ForgotPasswordScreen（简洁表单样式）
+ * 胡萝卜BBS - 找回密码
+ * 
+ * 设计风格：
+ * - 纯白背景，扁平化设计
+ * - 增大间距
+ * - 输入框带灰色背景填充
+ * - 橙色圆角按钮
+ */
+
+import React, { useEffect, useMemo, useState, useRef } from 'react';
 import {
   View,
   Text,
@@ -9,123 +20,28 @@ import {
   Platform,
   ScrollView,
   ActivityIndicator,
+  Animated,
+  StatusBar,
 } from 'react-native';
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { useRouter } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
-import { LinearGradient } from 'expo-linear-gradient';
-import { spacing, borderRadius, shadows, fontSizes, useAppColors, type AppColors } from '../../theme';
+import { useAppColors, type AppColors } from '../../theme';
 import { authService, resolveAuthApiError } from '../../services/authService';
 import { showPrompt } from '../../services/promptService';
 
-function createForgotPasswordStyles(colors: AppColors) {
-  return StyleSheet.create({
-    container: { flex: 1 },
-    gradient: { flex: 1 },
-    keyboardView: { flex: 1 },
-    scrollContent: {
-      flexGrow: 1,
-      justifyContent: 'center',
-      paddingHorizontal: spacing.xl,
-      paddingVertical: spacing['2xl'],
-    },
-    formCard: {
-      backgroundColor: colors.background.paper,
-      borderRadius: borderRadius['2xl'],
-      padding: spacing.xl,
-      ...shadows.md,
-    },
-    title: {
-      fontSize: fontSizes['2xl'],
-      fontWeight: '700',
-      color: colors.text.primary,
-      textAlign: 'center',
-      marginBottom: spacing.xs,
-    },
-    subtitle: {
-      fontSize: fontSizes.sm,
-      color: colors.text.secondary,
-      textAlign: 'center',
-      marginBottom: spacing.lg,
-    },
-    inputWrapper: {
-      flexDirection: 'row',
-      alignItems: 'center',
-      backgroundColor: colors.background.default,
-      borderRadius: borderRadius.lg,
-      borderWidth: 1.5,
-      borderColor: colors.divider,
-      paddingHorizontal: spacing.md,
-      height: 52,
-      marginBottom: spacing.md,
-    },
-    inputIcon: {
-      marginRight: spacing.sm,
-    },
-    input: {
-      flex: 1,
-      fontSize: fontSizes.md,
-      color: colors.text.primary,
-    },
-    codeRow: {
-      flexDirection: 'row',
-      alignItems: 'center',
-      gap: spacing.sm,
-      marginBottom: spacing.md,
-    },
-    codeInput: {
-      flex: 1,
-      marginBottom: 0,
-    },
-    sendCodeButton: {
-      height: 52,
-      minWidth: 110,
-      borderRadius: borderRadius.lg,
-      backgroundColor: colors.primary.main,
-      alignItems: 'center',
-      justifyContent: 'center',
-      paddingHorizontal: spacing.md,
-    },
-    sendCodeButtonDisabled: {
-      opacity: 0.6,
-    },
-    sendCodeButtonText: {
-      color: '#fff',
-      fontSize: fontSizes.sm,
-      fontWeight: '600',
-    },
-    submitButton: {
-      height: 50,
-      borderRadius: borderRadius.lg,
-      backgroundColor: colors.primary.main,
-      alignItems: 'center',
-      justifyContent: 'center',
-      marginTop: spacing.sm,
-    },
-    submitButtonDisabled: {
-      opacity: 0.6,
-    },
-    submitButtonText: {
-      color: '#fff',
-      fontSize: fontSizes.lg,
-      fontWeight: '700',
-    },
-    backButton: {
-      alignItems: 'center',
-      marginTop: spacing.md,
-    },
-    backButtonText: {
-      color: colors.primary.main,
-      fontSize: fontSizes.md,
-      fontWeight: '500',
-    },
-  });
-}
+// 胡萝卜橙主题色
+const THEME_COLORS = {
+  primary: '#FF6B35',
+  primaryLight: '#FF8C5A',
+  primaryDark: '#E55A2B',
+};
 
 export const ForgotPasswordScreen: React.FC = () => {
   const colors = useAppColors();
   const styles = useMemo(() => createForgotPasswordStyles(colors), [colors]);
   const router = useRouter();
+  
   const [email, setEmail] = useState('');
   const [verificationCode, setVerificationCode] = useState('');
   const [newPassword, setNewPassword] = useState('');
@@ -136,6 +52,26 @@ export const ForgotPasswordScreen: React.FC = () => {
   const [loading, setLoading] = useState(false);
   const [countdown, setCountdown] = useState(0);
 
+  // 动画值
+  const fadeAnim = useRef(new Animated.Value(0)).current;
+  const slideAnim = useRef(new Animated.Value(20)).current;
+
+  // 启动入场动画
+  useEffect(() => {
+    Animated.parallel([
+      Animated.timing(fadeAnim, {
+        toValue: 1,
+        duration: 400,
+        useNativeDriver: true,
+      }),
+      Animated.timing(slideAnim, {
+        toValue: 0,
+        duration: 400,
+        useNativeDriver: true,
+      }),
+    ]).start();
+  }, []);
+
   useEffect(() => {
     if (countdown <= 0) {
       return;
@@ -208,101 +144,308 @@ export const ForgotPasswordScreen: React.FC = () => {
 
   return (
     <SafeAreaView style={styles.container}>
-      <LinearGradient colors={['#FF6B35', '#FF8F66', '#FFB088']} style={styles.gradient}>
-        <KeyboardAvoidingView behavior={Platform.OS === 'ios' ? 'padding' : 'height'} style={styles.keyboardView}>
-          <ScrollView contentContainerStyle={styles.scrollContent} keyboardShouldPersistTaps="handled">
-            <View style={styles.formCard}>
+      <StatusBar barStyle="dark-content" backgroundColor="#fff" />
+      <KeyboardAvoidingView 
+        behavior={Platform.OS === 'ios' ? 'padding' : 'height'} 
+        style={styles.keyboardView}
+      >
+        <ScrollView 
+          contentContainerStyle={styles.scrollContent} 
+          keyboardShouldPersistTaps="handled"
+          showsVerticalScrollIndicator={false}
+        >
+          <Animated.View 
+            style={[
+              styles.content,
+              {
+                opacity: fadeAnim,
+                transform: [{ translateY: slideAnim }],
+              },
+            ]}
+          >
+            {/* 标题区域 */}
+            <View style={styles.titleSection}>
               <Text style={styles.title}>找回密码</Text>
-              <Text style={styles.subtitle}>请输入邮箱并完成验证码验证</Text>
+              <View style={styles.underline} />
+              <Text style={styles.subtitle}>请输入邮箱并完成验证</Text>
+            </View>
 
-              <View style={styles.inputWrapper}>
-                <MaterialCommunityIcons name="email-outline" size={22} color={colors.primary.main} style={styles.inputIcon} />
-                <TextInput
-                  style={styles.input}
-                  placeholder="邮箱"
-                  placeholderTextColor={colors.text.hint}
-                  value={email}
-                  onChangeText={setEmail}
-                  autoCapitalize="none"
-                  keyboardType="email-address"
-                />
-              </View>
-
-              <View style={styles.codeRow}>
-                <View style={[styles.inputWrapper, styles.codeInput]}>
-                  <MaterialCommunityIcons name="shield-key-outline" size={22} color={colors.primary.main} style={styles.inputIcon} />
+            {/* 表单区域 */}
+            <View style={styles.formSection}>
+              {/* 邮箱输入框 */}
+              <View style={styles.inputContainer}>
+                <Text style={styles.inputLabel}>邮箱</Text>
+                <View style={styles.inputWrapper}>
                   <TextInput
                     style={styles.input}
-                    placeholder="验证码"
+                    placeholder="请输入邮箱地址"
                     placeholderTextColor={colors.text.hint}
-                    value={verificationCode}
-                    onChangeText={setVerificationCode}
-                    keyboardType="number-pad"
-                    maxLength={6}
+                    value={email}
+                    onChangeText={setEmail}
+                    autoCapitalize="none"
+                    keyboardType="email-address"
                   />
-                </View>
-                <TouchableOpacity
-                  style={[styles.sendCodeButton, (sendingCode || countdown > 0) && styles.sendCodeButtonDisabled]}
-                  onPress={handleSendCode}
-                  disabled={sendingCode || countdown > 0}
-                >
-                  {sendingCode ? (
-                    <ActivityIndicator size="small" color="#fff" />
-                  ) : (
-                    <Text style={styles.sendCodeButtonText}>{countdown > 0 ? `${countdown}s` : '发送验证码'}</Text>
+                  {email.length > 0 && validateEmail(email) && (
+                    <MaterialCommunityIcons name="check-circle" size={20} color={THEME_COLORS.primary} style={styles.checkIcon} />
                   )}
-                </TouchableOpacity>
+                </View>
               </View>
 
-              <View style={styles.inputWrapper}>
-                <MaterialCommunityIcons name="lock-outline" size={22} color={colors.primary.main} style={styles.inputIcon} />
-                <TextInput
-                  style={styles.input}
-                  placeholder="新密码（至少6位）"
-                  placeholderTextColor={colors.text.hint}
-                  value={newPassword}
-                  onChangeText={setNewPassword}
-                  secureTextEntry={!showPassword}
-                  autoCapitalize="none"
-                />
-                <TouchableOpacity onPress={() => setShowPassword((v) => !v)}>
-                  <MaterialCommunityIcons name={showPassword ? 'eye-off-outline' : 'eye-outline'} size={20} color={colors.text.hint} />
-                </TouchableOpacity>
+              {/* 验证码 */}
+              <View style={styles.inputContainer}>
+                <Text style={styles.inputLabel}>验证码</Text>
+                <View style={styles.codeRow}>
+                  <View style={[styles.inputWrapper, styles.codeInputWrapper]}>
+                    <TextInput
+                      style={styles.input}
+                      placeholder="6位验证码"
+                      placeholderTextColor={colors.text.hint}
+                      value={verificationCode}
+                      onChangeText={setVerificationCode}
+                      keyboardType="number-pad"
+                      maxLength={6}
+                    />
+                  </View>
+                  <TouchableOpacity
+                    style={[styles.sendCodeButton, (sendingCode || countdown > 0) && styles.sendCodeButtonDisabled]}
+                    onPress={handleSendCode}
+                    disabled={sendingCode || countdown > 0}
+                    activeOpacity={0.8}
+                  >
+                    {sendingCode ? (
+                      <ActivityIndicator size="small" color={THEME_COLORS.primary} />
+                    ) : (
+                      <Text style={styles.sendCodeButtonText}>{countdown > 0 ? `${countdown}s` : '获取验证码'}</Text>
+                    )}
+                  </TouchableOpacity>
+                </View>
               </View>
 
-              <View style={styles.inputWrapper}>
-                <MaterialCommunityIcons name="lock-check-outline" size={22} color={colors.primary.main} style={styles.inputIcon} />
-                <TextInput
-                  style={styles.input}
-                  placeholder="确认新密码"
-                  placeholderTextColor={colors.text.hint}
-                  value={confirmPassword}
-                  onChangeText={setConfirmPassword}
-                  secureTextEntry={!showConfirmPassword}
-                  autoCapitalize="none"
-                />
-                <TouchableOpacity onPress={() => setShowConfirmPassword((v) => !v)}>
-                  <MaterialCommunityIcons name={showConfirmPassword ? 'eye-off-outline' : 'eye-outline'} size={20} color={colors.text.hint} />
-                </TouchableOpacity>
+              {/* 新密码输入框 */}
+              <View style={styles.inputContainer}>
+                <Text style={styles.inputLabel}>新密码</Text>
+                <View style={styles.inputWrapper}>
+                  <TextInput
+                    style={styles.input}
+                    placeholder="至少6位"
+                    placeholderTextColor={colors.text.hint}
+                    value={newPassword}
+                    onChangeText={setNewPassword}
+                    secureTextEntry={!showPassword}
+                    autoCapitalize="none"
+                  />
+                  <TouchableOpacity 
+                    onPress={() => setShowPassword((v) => !v)}
+                    style={styles.eyeButton}
+                  >
+                    <MaterialCommunityIcons 
+                      name={showPassword ? 'eye-off-outline' : 'eye-outline'} 
+                      size={20} 
+                      color={colors.text.hint} 
+                    />
+                  </TouchableOpacity>
+                </View>
               </View>
 
+              {/* 确认密码输入框 */}
+              <View style={styles.inputContainer}>
+                <Text style={styles.inputLabel}>确认密码</Text>
+                <View style={styles.inputWrapper}>
+                  <TextInput
+                    style={styles.input}
+                    placeholder="再次输入新密码"
+                    placeholderTextColor={colors.text.hint}
+                    value={confirmPassword}
+                    onChangeText={setConfirmPassword}
+                    secureTextEntry={!showConfirmPassword}
+                    autoCapitalize="none"
+                    returnKeyType="done"
+                    onSubmitEditing={handleResetPassword}
+                  />
+                  <TouchableOpacity 
+                    onPress={() => setShowConfirmPassword((v) => !v)}
+                    style={styles.eyeButton}
+                  >
+                    <MaterialCommunityIcons 
+                      name={showConfirmPassword ? 'eye-off-outline' : 'eye-outline'} 
+                      size={20} 
+                      color={colors.text.hint} 
+                    />
+                  </TouchableOpacity>
+                </View>
+              </View>
+
+              {/* 重置密码按钮 */}
               <TouchableOpacity
                 style={[styles.submitButton, loading && styles.submitButtonDisabled]}
                 onPress={handleResetPassword}
                 disabled={loading}
+                activeOpacity={0.9}
               >
-                {loading ? <ActivityIndicator size="small" color="#fff" /> : <Text style={styles.submitButtonText}>重置密码</Text>}
+                {loading ? (
+                  <ActivityIndicator size="small" color="#fff" />
+                ) : (
+                  <Text style={styles.submitButtonText}>重置密码</Text>
+                )}
               </TouchableOpacity>
 
-              <TouchableOpacity style={styles.backButton} onPress={() => router.back()}>
+              {/* 返回登录 */}
+              <TouchableOpacity 
+                style={styles.backButton} 
+                onPress={() => router.back()}
+                activeOpacity={0.8}
+              >
+                <MaterialCommunityIcons name="arrow-left" size={18} color={THEME_COLORS.primary} style={{ marginRight: 4 }} />
                 <Text style={styles.backButtonText}>返回登录</Text>
               </TouchableOpacity>
             </View>
-          </ScrollView>
-        </KeyboardAvoidingView>
-      </LinearGradient>
+          </Animated.View>
+        </ScrollView>
+      </KeyboardAvoidingView>
     </SafeAreaView>
   );
 };
 
+function createForgotPasswordStyles(colors: AppColors) {
+  return StyleSheet.create({
+    container: {
+      flex: 1,
+      backgroundColor: '#fff',
+    },
+    keyboardView: {
+      flex: 1,
+    },
+    scrollContent: {
+      flexGrow: 1,
+      paddingHorizontal: 28,
+      paddingTop: 50,
+      paddingBottom: 40,
+    },
+    content: {
+      flex: 1,
+      maxWidth: 400,
+      width: '100%',
+      alignSelf: 'center',
+    },
+
+    // 标题区域
+    titleSection: {
+      marginBottom: 40,
+      marginTop: 20,
+    },
+    title: {
+      fontSize: 32,
+      fontWeight: '700',
+      color: colors.text.primary,
+      lineHeight: 40,
+    },
+    underline: {
+      width: 40,
+      height: 4,
+      backgroundColor: THEME_COLORS.primary,
+      borderRadius: 2,
+      marginTop: 12,
+      marginBottom: 16,
+    },
+    subtitle: {
+      fontSize: 16,
+      color: colors.text.secondary,
+    },
+
+    // 表单区域
+    formSection: {
+      marginBottom: 24,
+    },
+
+    // 输入框
+    inputContainer: {
+      marginBottom: 20,
+    },
+    inputLabel: {
+      fontSize: 14,
+      fontWeight: '500',
+      color: colors.text.secondary,
+      marginBottom: 10,
+    },
+    inputWrapper: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      backgroundColor: '#F5F5F7',
+      borderRadius: 14,
+      paddingHorizontal: 18,
+      height: 56,
+    },
+    input: {
+      flex: 1,
+      fontSize: 16,
+      color: colors.text.primary,
+      height: 56,
+    },
+    checkIcon: {
+      marginLeft: 8,
+    },
+    eyeButton: {
+      padding: 4,
+      marginLeft: 4,
+    },
+
+    // 验证码行
+    codeRow: {
+      flexDirection: 'row',
+      gap: 12,
+    },
+    codeInputWrapper: {
+      flex: 1,
+    },
+    sendCodeButton: {
+      height: 56,
+      paddingHorizontal: 16,
+      backgroundColor: 'rgba(255, 107, 53, 0.1)',
+      borderRadius: 14,
+      alignItems: 'center',
+      justifyContent: 'center',
+      minWidth: 100,
+    },
+    sendCodeButtonDisabled: {
+      opacity: 0.5,
+    },
+    sendCodeButtonText: {
+      fontSize: 14,
+      fontWeight: '600',
+      color: THEME_COLORS.primary,
+    },
+
+    // 提交按钮
+    submitButton: {
+      height: 56,
+      borderRadius: 14,
+      backgroundColor: THEME_COLORS.primary,
+      alignItems: 'center',
+      justifyContent: 'center',
+      marginTop: 8,
+    },
+    submitButtonDisabled: {
+      opacity: 0.7,
+    },
+    submitButtonText: {
+      color: '#fff',
+      fontSize: 17,
+      fontWeight: '600',
+    },
+
+    // 返回按钮
+    backButton: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'center',
+      marginTop: 24,
+    },
+    backButtonText: {
+      color: THEME_COLORS.primary,
+      fontSize: 15,
+      fontWeight: '500',
+    },
+  });
+}
+
 export default ForgotPasswordScreen;

src/screens/auth/LoginScreen.tsx

@@ -1,10 +1,12 @@
 /**
- * 登录页 LoginScreen（响应式适配 - 分栏布局）
+ * 登录页 LoginScreen（简洁表单样式）
  * 胡萝卜BBS - 用户登录
  * 
- * 布局规则：
- * - 屏幕宽度 < 768px：单栏布局，橙色渐变背景
- * - 屏幕宽度 >= 768px：分栏布局，左侧橙色右侧中性灰
+ * 设计风格：
+ * - 纯白背景，扁平化设计
+ * - 增大间距，避免页面太空
+ * - 输入框带灰色背景填充
+ * - 橙色圆角按钮
  */
 
 import React, { useState, useEffect, useRef, useMemo } from 'react';
@@ -24,15 +26,18 @@ import {
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { useRouter } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
-import { LinearGradient } from 'expo-linear-gradient';
-import { spacing, borderRadius, shadows, fontSizes, useAppColors, type AppColors } from '../../theme';
+import { useAppColors, type AppColors } from '../../theme';
 import { useAuthStore } from '../../stores';
 import * as hrefs from '../../navigation/hrefs';
-import { useResponsive, useResponsiveValue } from '../../hooks';
+import { useResponsive } from '../../hooks';
 import { showPrompt } from '../../services/promptService';
 
-// 分栏布局断点
-const SPLIT_BREAKPOINT = 768;
+// 胡萝卜橙主题色
+const THEME_COLORS = {
+  primary: '#FF6B35',
+  primaryLight: '#FF8C5A',
+  primaryDark: '#E55A2B',
+};
 
 export const LoginScreen: React.FC = () => {
   const colors = useAppColors();
@@ -40,67 +45,29 @@ export const LoginScreen: React.FC = () => {
   const router = useRouter();
   const login = useAuthStore((state) => state.login);
   const isAuthenticated = useAuthStore((state) => state.isAuthenticated);
-  const storeError = useAuthStore((state) => state.error);
   const setStoreError = useAuthStore((state) => state.setError);
 
-  // 响应式布局
-  const { isLandscape, width } = useResponsive();
-  
-  // 是否使用分栏布局
-  const isSplitLayout = width >= SPLIT_BREAKPOINT;
+  const { isLandscape } = useResponsive();
 
   const [username, setUsername] = useState('');
   const [password, setPassword] = useState('');
   const [loading, setLoading] = useState(false);
   const [showPassword, setShowPassword] = useState(false);
-  const [errorMsg, setErrorMsg] = useState<string | null>(null);
 
   // 动画值
   const fadeAnim = useRef(new Animated.Value(0)).current;
-  const slideAnim = useRef(new Animated.Value(50)).current;
-  const scaleAnim = useRef(new Animated.Value(0.9)).current;
-  const inputFadeAnim = useRef(new Animated.Value(0)).current;
-
-  // 响应式值 - 大屏模式单独放大Logo尺寸，更显大气
-  const logoSize = useResponsiveValue({ 
-    xs: 64, sm: 72, md: 80, 
-    lg: isSplitLayout ? 140 : 96,  // 大屏模式Logo图标进一步放大
-    xl: isSplitLayout ? 160 : 110 
-  });
-  const logoContainerSize = useResponsiveValue({ 
-    xs: 110, sm: 120, md: 130, 
-    lg: isSplitLayout ? 200 : 150, // 大屏模式Logo容器进一步放大
-    xl: isSplitLayout ? 220 : 170 
-  });
-  const appNameSize = useResponsiveValue({ 
-    xs: 28, sm: 30, md: 32, 
-    lg: isSplitLayout ? 60 : 36,   // 大屏模式标题文字大幅放大
-    xl: isSplitLayout ? 72 : 40 
-  });
-  const formMaxWidth = isSplitLayout ? 420 : undefined;
+  const slideAnim = useRef(new Animated.Value(20)).current;
 
   // 启动入场动画
   useEffect(() => {
-    Animated.sequence([
-      Animated.parallel([
-        Animated.timing(fadeAnim, {
-          toValue: 1,
-          duration: 600,
-          useNativeDriver: true,
-        }),
-        Animated.timing(scaleAnim, {
-          toValue: 1,
-          duration: 600,
-          useNativeDriver: true,
-        }),
-      ]),
-      Animated.timing(slideAnim, {
-        toValue: 0,
-        duration: 500,
+    Animated.parallel([
+      Animated.timing(fadeAnim, {
+        toValue: 1,
+        duration: 400,
         useNativeDriver: true,
       }),
-      Animated.timing(inputFadeAnim, {
-        toValue: 1,
+      Animated.timing(slideAnim, {
+        toValue: 0,
         duration: 400,
         useNativeDriver: true,
       }),
@@ -124,13 +91,6 @@ export const LoginScreen: React.FC = () => {
     return true;
   };
 
-  // store error 同步到本地
-  useEffect(() => {
-    if (storeError) {
-      setErrorMsg(storeError);
-    }
-  }, [storeError]);
-
   useEffect(() => {
     if (isAuthenticated) {
       router.replace(hrefs.hrefHome());
@@ -138,7 +98,6 @@ export const LoginScreen: React.FC = () => {
   }, [isAuthenticated, router]);
 
   const clearError = () => {
-    setErrorMsg(null);
     setStoreError(null);
   };
 
@@ -152,11 +111,11 @@ export const LoginScreen: React.FC = () => {
       const success = await login({ username, password });
       if (!success) {
         if (!useAuthStore.getState().error) {
-          setErrorMsg('登录失败，请稍后重试');
+          showPrompt({ title: '登录失败', message: '请检查用户名和密码', type: 'error' });
         }
       }
     } catch (error: any) {
-      setErrorMsg(error.message || '登录失败，请检查用户名和密码');
+      showPrompt({ title: '登录失败', message: error.message || '请检查用户名和密码', type: 'error' });
     } finally {
       setLoading(false);
     }
@@ -167,605 +126,257 @@ export const LoginScreen: React.FC = () => {
     router.push(hrefs.hrefAuthRegister());
   };
 
-  // 渲染左侧面板（Logo和品牌信息）- 优化大屏布局
-  const renderLeftPanel = () => (
-    <Animated.View
-      style={[
-        styles.leftPanel,
-        isSplitLayout && styles.splitLeftPanel, // 大屏模式专用布局
-        {
-          opacity: fadeAnim,
-          transform: [{ scale: scaleAnim }],
-        },
-      ]}
-    >
-      {/* 胡萝卜图标 - 靠上显示 */}
-      <View style={[
-        styles.logoContainer,
-        styles.logoContainerTop,
-        isSplitLayout && styles.splitLogoContainer, // 大屏模式Logo容器样式
-        { width: logoContainerSize, height: logoContainerSize, borderRadius: logoContainerSize / 2 }
-      ]}>
-        <MaterialCommunityIcons
-          name="carrot"
-          size={logoSize}
-          color="#FFF"
-        />
-      </View>
-      
-      {/* 品牌名称 - 优化大屏排版 */}
-      <Text style={[styles.appName, isSplitLayout && styles.splitAppName]}>萝卜社区</Text>
-      <Text style={[styles.subtitle, isSplitLayout && styles.splitSubtitle]}>发现有趣的内容，结识志同道合的朋友</Text>
-      
-      {/* 装饰元素 - 大屏模式改为水平排列 + 大幅放大 */}
-      <View style={[styles.leftPanelDecorBottom, isSplitLayout && styles.splitLeftPanelDecorBottom]}>
-        {isSplitLayout ? (
-          // 大屏模式：水平排列 + 大幅放大图标
-          <View style={styles.splitDecorRow}>
-            <MaterialCommunityIcons name="chat-outline" size={80} color="rgba(255,255,255,0.4)" style={styles.splitDecorIcon} />
-            <MaterialCommunityIcons name="account-group-outline" size={90} color="rgba(255,255,255,0.45)" style={styles.splitDecorIcon} />
-            <MaterialCommunityIcons name="bell-outline" size={85} color="rgba(255,255,255,0.35)" style={styles.splitDecorIcon} />
-          </View>
-        ) : (
-          // 小屏模式：保持原有横向排列
-          <View style={styles.decorRow}>
-            <MaterialCommunityIcons name="chat-outline" size={48} color="rgba(255,255,255,0.35)" />
-            <MaterialCommunityIcons name="account-group-outline" size={44} color="rgba(255,255,255,0.3)" />
-            <MaterialCommunityIcons name="bell-outline" size={40} color="rgba(255,255,255,0.25)" />
-          </View>
-        )}
-      </View>
-    </Animated.View>
-  );
-
-  // 渲染表单内容
-  const renderFormContent = () => (
-    <View style={isSplitLayout ? styles.splitFormWrapper : styles.singleFormWrapper}>
-      <Animated.View 
-        style={[
-          styles.formCard,
-          // 核心修改：大屏模式使用专用的阴影样式，小屏用原有阴影
-          isSplitLayout ? styles.splitFormCardShadow : styles.normalFormCardShadow,
-          formMaxWidth && { maxWidth: formMaxWidth, width: '100%' },
-          {
-            opacity: inputFadeAnim,
-            transform: [{ translateY: slideAnim }],
-          },
-        ]}
-      >
-        <Text style={styles.formTitle}>欢迎回来</Text>
-        
-        {/* 用户名输入框 */}
-        <View style={styles.inputContainer}>
-          <View style={styles.inputWrapper}>
-            <MaterialCommunityIcons
-              name="account-outline"
-              size={22}
-              color={colors.primary.main}
-              style={styles.inputIcon}
-            />
-            <TextInput
-              style={styles.input}
-              placeholder="用户名 / 邮箱 / 手机号"
-              placeholderTextColor={colors.text.hint}
-              value={username}
-              onChangeText={(v) => { setUsername(v); clearError(); }}
-              autoCapitalize="none"
-              autoCorrect={false}
-              returnKeyType="next"
-            />
-            {username.length > 0 && (
-              <TouchableOpacity 
-                onPress={() => setUsername('')}
-                style={styles.clearButton}
-              >
-                <MaterialCommunityIcons 
-                  name="close-circle" 
-                  size={20} 
-                  color={colors.text.hint} 
-                />
-              </TouchableOpacity>
-            )}
-          </View>
-        </View>
-
-        {/* 密码输入框 */}
-        <View style={styles.inputContainer}>
-          <View style={styles.inputWrapper}>
-            <MaterialCommunityIcons
-              name="lock-outline"
-              size={22}
-              color={colors.primary.main}
-              style={styles.inputIcon}
-            />
-            <TextInput
-              style={styles.input}
-              placeholder="请输入密码"
-              placeholderTextColor={colors.text.hint}
-              value={password}
-              onChangeText={(v) => { setPassword(v); clearError(); }}
-              secureTextEntry={!showPassword}
-              autoCapitalize="none"
-              returnKeyType="done"
-              onSubmitEditing={handleLogin}
-            />
-            <TouchableOpacity 
-              onPress={() => setShowPassword(!showPassword)}
-              style={styles.clearButton}
-            >
-              <MaterialCommunityIcons 
-                name={showPassword ? 'eye-off-outline' : 'eye-outline'} 
-                size={20} 
-                color={colors.text.hint} 
-              />
-            </TouchableOpacity>
-          </View>
-        </View>
-
-        {/* 忘记密码 */}
-        <TouchableOpacity
-          style={styles.forgotPassword}
-          onPress={() => router.push(hrefs.hrefAuthForgot())}
-        >
-          <Text style={styles.forgotPasswordText}>忘记密码？</Text>
-        </TouchableOpacity>
-
-        {/* 内联错误提示 */}
-        {errorMsg && (
-          <View style={styles.errorBox}>
-            <MaterialCommunityIcons
-              name="alert-circle-outline"
-              size={16}
-              color={colors.error.dark}
-              style={{ marginRight: 6, marginTop: 1 }}
-            />
-            <Text style={styles.errorText}>{errorMsg}</Text>
-          </View>
-        )}
-
-        {/* 登录按钮 */}
-        <TouchableOpacity
-          style={[styles.loginButton, loading && styles.loginButtonDisabled]}
-          onPress={handleLogin}
-          disabled={loading}
-          activeOpacity={0.8}
-        >
-          <LinearGradient
-            colors={[colors.primary.main, colors.primary.light]}
-            start={{ x: 0, y: 0 }}
-            end={{ x: 1, y: 0 }}
-            style={styles.loginButtonGradient}
-          >
-            {loading ? (
-              <ActivityIndicator size="small" color="#FFF" />
-            ) : (
-              <Text style={styles.loginButtonText}>登 录</Text>
-            )}
-          </LinearGradient>
-        </TouchableOpacity>
-      </Animated.View>
-
-      {/* 底部注册提示 */}
-      <Animated.View 
-        style={[
-          styles.footerSection,
-          { opacity: inputFadeAnim },
-        ]}
-      >
-        <Text style={styles.footerText}>还没有账号？</Text>
-        <TouchableOpacity onPress={handleGoToRegister}>
-          <Text style={styles.registerLink}>立即注册</Text>
-        </TouchableOpacity>
-      </Animated.View>
-    </View>
-  );
-
-  // 渲染分栏布局
-  const renderSplitLayout = () => (
-    <View style={styles.splitContainer}>
-      {/* 左侧橙色面板 */}
-      <LinearGradient
-        colors={[colors.primary.main, colors.primary.light, '#FFB088']}
-        start={{ x: 0, y: 0 }}
-        end={{ x: 1, y: 1 }}
-        style={styles.leftPanelContainer}
-      >
-        {/* 装饰性背景元素 */}
-        <View style={styles.decorCircle1} />
-        <View style={styles.decorCircle2} />
-        
-        <StatusBar barStyle="light-content" />
-        <SafeAreaView style={styles.leftPanelSafeArea}>
-          {renderLeftPanel()}
-        </SafeAreaView>
-      </LinearGradient>
-
-      {/* 右侧中性灰面板 */}
-      <View style={styles.rightPanelContainer}>
-        <StatusBar barStyle="dark-content" />
-        <SafeAreaView style={styles.rightPanelSafeArea}>
-          {/* 核心修复：用View包裹，确保垂直+水平居中 */}
-          <View style={styles.splitRightContentWrapper}>
-            {renderFormContent()}
-          </View>
-        </SafeAreaView>
-      </View>
-    </View>
-  );
-
-  // 渲染单栏布局
-  const renderSingleLayout = () => (
+  return (
     <SafeAreaView style={styles.container}>
-      <StatusBar barStyle="light-content" />
-      <LinearGradient
-        colors={[colors.primary.main, colors.primary.light, '#FFB088']}
-        start={{ x: 0, y: 0 }}
-        end={{ x: 1, y: 1 }}
-        style={styles.gradient}
+      <StatusBar barStyle="dark-content" backgroundColor="#fff" />
+      <KeyboardAvoidingView
+        behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
+        style={styles.keyboardView}
       >
-        <KeyboardAvoidingView
-          behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
-          style={styles.keyboardView}
+        <ScrollView
+          contentContainerStyle={[
+            styles.scrollContent,
+            isLandscape && styles.scrollContentLandscape,
+          ]}
+          showsVerticalScrollIndicator={false}
+          keyboardShouldPersistTaps="handled"
         >
-          <ScrollView
-            contentContainerStyle={[
-              styles.scrollContent,
-              isLandscape && styles.scrollContentLandscape,
+          <Animated.View 
+            style={[
+              styles.content,
+              {
+                opacity: fadeAnim,
+                transform: [{ translateY: slideAnim }],
+              },
             ]}
-            showsVerticalScrollIndicator={false}
-            keyboardShouldPersistTaps="handled"
           >
-            {/* 装饰性背景元素 */}
-            <View style={styles.decorCircle1} />
-            <View style={styles.decorCircle2} />
-            
-            {/* 头部 */}
-            <Animated.View 
-              style={[
-                styles.headerSection,
-                isLandscape && styles.headerSectionLandscape,
-                {
-                  opacity: fadeAnim,
-                  transform: [{ scale: scaleAnim }],
-                },
-              ]}
-            >
-              <View style={[
-                styles.logoContainer,
-                { width: logoContainerSize, height: logoContainerSize, borderRadius: logoContainerSize / 2 }
-              ]}>
-                <MaterialCommunityIcons 
-                  name="carrot" 
-                  size={logoSize} 
-                  color="#FFF" 
-                />
-              </View>
-              <Text style={[styles.appName, { fontSize: appNameSize }]}>萝卜社区</Text>
-              <Text style={styles.subtitle}>发现有趣的内容，结识志同道合的朋友</Text>
-            </Animated.View>
+            {/* 标题区域 - 增大间距 */}
+            <View style={styles.titleSection}>
+              <Text style={styles.title}>欢迎回来</Text>
+              <View style={styles.underline} />
+              <Text style={styles.subtitle}>请登录您的账号</Text>
+            </View>
 
-            {/* 表单 */}
-            {renderFormContent()}
-          </ScrollView>
-        </KeyboardAvoidingView>
-      </LinearGradient>
+            {/* 表单区域 */}
+            <View style={styles.formSection}>
+              {/* 用户名输入框 */}
+              <View style={styles.inputContainer}>
+                <Text style={styles.inputLabel}>用户名</Text>
+                <View style={styles.inputWrapper}>
+                  <TextInput
+                    style={styles.input}
+                    placeholder="请输入用户名"
+                    placeholderTextColor={colors.text.hint}
+                    value={username}
+                    onChangeText={(v) => { setUsername(v); clearError(); }}
+                    autoCapitalize="none"
+                    autoCorrect={false}
+                    returnKeyType="next"
+                  />
+                  {username.length > 0 && (
+                    <MaterialCommunityIcons name="check-circle" size={20} color={THEME_COLORS.primary} style={styles.checkIcon} />
+                  )}
+                </View>
+              </View>
+
+              {/* 密码输入框 */}
+              <View style={styles.inputContainer}>
+                <Text style={styles.inputLabel}>密码</Text>
+                <View style={styles.inputWrapper}>
+                  <TextInput
+                    style={styles.input}
+                    placeholder="请输入密码"
+                    placeholderTextColor={colors.text.hint}
+                    value={password}
+                    onChangeText={(v) => { setPassword(v); clearError(); }}
+                    secureTextEntry={!showPassword}
+                    autoCapitalize="none"
+                    returnKeyType="done"
+                    onSubmitEditing={handleLogin}
+                  />
+                  <TouchableOpacity 
+                    onPress={() => setShowPassword(!showPassword)}
+                    style={styles.eyeButton}
+                  >
+                    <MaterialCommunityIcons 
+                      name={showPassword ? 'eye-off-outline' : 'eye-outline'} 
+                      size={20} 
+                      color={colors.text.hint} 
+                    />
+                  </TouchableOpacity>
+                </View>
+              </View>
+
+              {/* 忘记密码 */}
+              <TouchableOpacity
+                style={styles.forgotPassword}
+                onPress={() => router.push(hrefs.hrefAuthForgot())}
+              >
+                <Text style={styles.forgotPasswordText}>忘记密码？</Text>
+              </TouchableOpacity>
+
+              {/* 登录按钮 */}
+              <TouchableOpacity
+                style={[styles.loginButton, loading && styles.loginButtonDisabled]}
+                onPress={handleLogin}
+                disabled={loading}
+                activeOpacity={0.9}
+              >
+                {loading ? (
+                  <ActivityIndicator size="small" color="#FFF" />
+                ) : (
+                  <Text style={styles.loginButtonText}>登 录</Text>
+                )}
+              </TouchableOpacity>
+            </View>
+
+            {/* 底部注册提示 */}
+            <View style={styles.footer}>
+              <Text style={styles.footerText}>还没有账号？</Text>
+              <TouchableOpacity onPress={handleGoToRegister}>
+                <Text style={styles.registerLink}>立即注册</Text>
+              </TouchableOpacity>
+            </View>
+          </Animated.View>
+        </ScrollView>
+      </KeyboardAvoidingView>
     </SafeAreaView>
   );
-
-  return isSplitLayout ? renderSplitLayout() : renderSingleLayout();
 };
 
 function createLoginStyles(colors: AppColors) {
   return StyleSheet.create({
-  container: {
-    flex: 1,
-  },
-  gradient: {
-    flex: 1,
-  },
-  keyboardView: {
-    flex: 1,
-  },
-  // 单栏布局内容
-  scrollContent: {
-    flexGrow: 1,
-    paddingHorizontal: spacing.xl,
-    paddingVertical: spacing['2xl'],
-  },
-  scrollContentCentered: {
-    alignItems: 'center',
-    justifyContent: 'center',
-    flex: 1,
-  },
-  scrollContentLandscape: {
-    paddingVertical: spacing.lg,
-  },
-  // 装饰性背景元素
-  decorCircle1: {
-    position: 'absolute',
-    top: -100,
-    right: -100,
-    width: 300,
-    height: 300,
-    borderRadius: 150,
-    backgroundColor: 'rgba(255,255,255,0.1)',
-  },
-  decorCircle2: {
-    position: 'absolute',
-    bottom: 100,
-    left: -150,
-    width: 250,
-    height: 250,
-    borderRadius: 125,
-    backgroundColor: 'rgba(255,255,255,0.08)',
-  },
-  // 头部区域
-  headerSection: {
-    alignItems: 'center',
-    marginTop: spacing['3xl'],
-    marginBottom: spacing['3xl'],
-  },
-  headerSectionLandscape: {
-    marginTop: spacing.lg,
-    marginBottom: spacing.lg,
-  },
-  logoContainer: {
-    backgroundColor: 'rgba(255,255,255,0.25)',
-    alignItems: 'center',
-    justifyContent: 'center',
-    marginBottom: spacing.lg,
-    borderWidth: 2,
-    borderColor: 'rgba(255,255,255,0.4)',
-    ...shadows.md,
-  },
-  // 大屏模式Logo容器样式 - 增加阴影和内边距，更立体
-  splitLogoContainer: {
-    borderWidth: 3,
-    borderColor: 'rgba(255,255,255,0.5)',
-    ...shadows.lg,
-  },
-  logoContainerTop: {
-    marginTop: spacing['3xl'],
-  },
-  appName: {
-    fontWeight: '800',
-    color: '#FFFFFF',
-    marginBottom: spacing.sm,
-    textShadowColor: 'rgba(0,0,0,0.1)',
-    textShadowOffset: { width: 0, height: 2 },
-    textShadowRadius: 4,
-  },
-  // 大屏模式标题样式 - 大幅放大，增加间距和文字效果
-  splitAppName: {
-    fontSize: 72, // 大幅放大主标题
-    marginBottom: spacing['2xl'],
-    textShadowOffset: { width: 0, height: 4 },
-    textShadowRadius: 8,
-    letterSpacing: 4, // 增加字间距，更显大气
-    fontWeight: '900',
-  },
-  subtitle: {
-    fontSize: fontSizes.md,
-    color: 'rgba(255,255,255,0.9)',
-    textAlign: 'center',
-    paddingHorizontal: spacing.xl,
-  },
-  // 大屏模式副标题样式 - 大幅放大
-  splitSubtitle: {
-    fontSize: 24, // 放大副标题
-    marginBottom: spacing['6xl'], // 增加底部间距
-    lineHeight: 36,
-    paddingHorizontal: spacing['4xl'],
-    letterSpacing: 1.5,
-    fontWeight: '500',
-  },
-  // 表单卡片（基础样式，无阴影）
-  formCard: {
-    backgroundColor: colors.background.paper,
-    borderRadius: borderRadius['2xl'],
-    padding: spacing['2xl'],
-    marginBottom: spacing.xl,
-  },
-  // 小屏模式：原有默认阴影
-  normalFormCardShadow: {
-    ...shadows.md,
-  },
-  // 大屏模式：专用全向阴影
-  splitFormCardShadow: {
-    // iOS 全向柔和阴影
-    shadowColor: '#000',
-    shadowOffset: { width: 0, height: 2 },
-    shadowOpacity: 0.12,
-    shadowRadius: 12,
-    // Android 高程 + 轻微边框（模拟顶部阴影）
-    elevation: 8,
-    // 新增：极细微的顶部边框，强化区分度
-    borderTopWidth: 1,
-    borderTopColor: 'rgba(0,0,0,0.05)',
-  },
-  formTitle: {
-    fontSize: fontSizes['2xl'],
-    fontWeight: '700',
-    color: colors.text.primary,
-    marginBottom: spacing.xl,
-    textAlign: 'center',
-  },
-  inputContainer: {
-    marginBottom: spacing.lg,
-  },
-  inputWrapper: {
-    flexDirection: 'row',
-    alignItems: 'center',
-    backgroundColor: colors.background.default,
-    borderRadius: borderRadius.lg,
-    borderWidth: 1.5,
-    borderColor: colors.divider,
-    paddingHorizontal: spacing.md,
-    height: 56,
-  },
-  inputIcon: {
-    marginRight: spacing.sm,
-  },
-  input: {
-    flex: 1,
-    fontSize: fontSizes.md,
-    color: colors.text.primary,
-  },
-  clearButton: {
-    padding: spacing.xs,
-  },
-  forgotPassword: {
-    alignSelf: 'flex-end',
-    marginBottom: spacing.md,
-  },
-  forgotPasswordText: {
-    fontSize: fontSizes.sm,
-    color: colors.primary.main,
-    fontWeight: '600',
-  },
-  errorBox: {
-    flexDirection: 'row',
-    alignItems: 'flex-start',
-    backgroundColor: colors.accent.light,
-    borderRadius: borderRadius.md,
-    paddingHorizontal: spacing.md,
-    paddingVertical: spacing.sm,
-    marginBottom: spacing.md,
-    borderLeftWidth: 3,
-    borderLeftColor: colors.accent.main,
-  },
-  errorText: {
-    flex: 1,
-    fontSize: fontSizes.sm,
-    color: colors.accent.dark,
-    lineHeight: 20,
-  },
-  loginButton: {
-    borderRadius: borderRadius.lg,
-    overflow: 'hidden',
-    ...shadows.md,
-  },
-  loginButtonGradient: {
-    height: 52,
-    alignItems: 'center',
-    justifyContent: 'center',
-  },
-  loginButtonDisabled: {
-    opacity: 0.7,
-  },
-  loginButtonText: {
-    fontSize: fontSizes.lg,
-    fontWeight: '700',
-    color: '#FFFFFF',
-  },
-  // 底部区域
-  footerSection: {
-    flexDirection: 'row',
-    justifyContent: 'center',
-    alignItems: 'center',
-    paddingTop: spacing.xl,
-  },
-  footerText: {
-    fontSize: fontSizes.md,
-    color: colors.text.primary,
-  },
-  registerLink: {
-    fontSize: fontSizes.md,
-    color: colors.primary.main,
-    fontWeight: '700',
-    marginLeft: spacing.xs,
-    textDecorationLine: 'underline',
-  },
-  // ========== 分栏布局样式 ==========
-  splitContainer: {
-    flex: 1,
-    flexDirection: 'row',
-  },
-  leftPanelContainer: {
-    flex: 1,  // 50%
-    justifyContent: 'center',
-    alignItems: 'center',
-    overflow: 'hidden',
-  },
-  leftPanelSafeArea: {
-    flex: 1,
-    justifyContent: 'center',
-    alignItems: 'center',
-    paddingHorizontal: spacing['4xl'], // 增加内边距，不贴边
-  },
-  leftPanel: {
-    alignItems: 'center',
-    paddingHorizontal: spacing['2xl'],
-  },
-  // 大屏模式左侧面板布局
-  splitLeftPanel: {
-    width: '100%',
-    justifyContent: 'center',
-    paddingVertical: spacing['6xl'],
-  },
-  leftPanelDecor: {
-    position: 'absolute',
-    bottom: spacing['4xl'],
-    left: 0,
-    right: 0,
-    alignItems: 'center',
-  },
-  leftPanelDecorBottom: {
-    marginTop: spacing['2xl'],
-  },
-  // 大屏模式装饰元素布局
-  splitLeftPanelDecorBottom: {
-    marginTop: spacing['6xl'],
-    width: '100%',
-    alignItems: 'center',
-  },
-  // 大屏模式装饰元素水平排列
-  splitDecorRow: {
-    flexDirection: 'row',
-    alignItems: 'center',
-    justifyContent: 'space-around',
-    width: '100%',
-    gap: spacing['2xl'], // 增加图标间距
-  },
-  // 大屏模式装饰图标样式
-  splitDecorIcon: {
-    transform: [{ scale: 1.1 }],
-    opacity: 0.9,
-  },
-  decorRow: {
-    flexDirection: 'row',
-    alignItems: 'center',
-    justifyContent: 'space-around',
-    width: '80%',
-  },
-  rightPanelContainer: {
-    flex: 1,  // 50%
-    backgroundColor: colors.background.paper,
-  },
-  rightPanelSafeArea: {
-    flex: 1,
-    // 移除左右内边距，交给子容器控制
-  },
-  // 分栏布局右侧内容包裹器（核心修复）
-  splitRightContentWrapper: {
-    flex: 1,
-    justifyContent: 'center',
-    alignItems: 'center',
-    // 新增：左右内边距，保证表单和边缘有间距
-    paddingHorizontal: spacing['2xl'],
-  },
-  // 表单内容包裹器（区分大屏/小屏）
-  splitFormWrapper: {
-    // 关键修改：设置最大宽度 + 自适应宽度，实现水平居中
-    maxWidth: 420,
-    width: '100%',
-  },
-  singleFormWrapper: {
-    flexGrow: 1,
-    width: '100%',
-    // 移除这里的阴影，避免重复
-  },
+    container: {
+      flex: 1,
+      backgroundColor: '#fff',
+    },
+    keyboardView: {
+      flex: 1,
+    },
+    scrollContent: {
+      flexGrow: 1,
+      paddingHorizontal: 28,
+      paddingTop: 60,
+      paddingBottom: 40,
+    },
+    scrollContentLandscape: {
+      paddingTop: 30,
+    },
+    content: {
+      flex: 1,
+      maxWidth: 400,
+      width: '100%',
+      alignSelf: 'center',
+    },
+
+    // 标题区域 - 增大间距
+    titleSection: {
+      marginBottom: 48,
+      marginTop: 20,
+    },
+    title: {
+      fontSize: 32,
+      fontWeight: '700',
+      color: colors.text.primary,
+      lineHeight: 40,
+    },
+    underline: {
+      width: 40,
+      height: 4,
+      backgroundColor: THEME_COLORS.primary,
+      borderRadius: 2,
+      marginTop: 12,
+      marginBottom: 16,
+    },
+    subtitle: {
+      fontSize: 16,
+      color: colors.text.secondary,
+    },
+
+    // 表单区域
+    formSection: {
+      marginBottom: 32,
+    },
+
+    // 输入框
+    inputContainer: {
+      marginBottom: 24,
+    },
+    inputLabel: {
+      fontSize: 14,
+      fontWeight: '500',
+      color: colors.text.secondary,
+      marginBottom: 10,
+    },
+    inputWrapper: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      backgroundColor: '#F5F5F7',
+      borderRadius: 14,
+      paddingHorizontal: 18,
+      height: 56,
+    },
+    input: {
+      flex: 1,
+      fontSize: 16,
+      color: colors.text.primary,
+      height: 56,
+    },
+    checkIcon: {
+      marginLeft: 8,
+    },
+    eyeButton: {
+      padding: 4,
+      marginLeft: 4,
+    },
+
+    // 忘记密码
+    forgotPassword: {
+      alignSelf: 'flex-end',
+      marginBottom: 28,
+      marginTop: -8,
+    },
+    forgotPasswordText: {
+      fontSize: 14,
+      color: THEME_COLORS.primary,
+      fontWeight: '500',
+    },
+
+    // 登录按钮
+    loginButton: {
+      height: 56,
+      borderRadius: 14,
+      backgroundColor: THEME_COLORS.primary,
+      alignItems: 'center',
+      justifyContent: 'center',
+    },
+    loginButtonDisabled: {
+      opacity: 0.7,
+    },
+    loginButtonText: {
+      fontSize: 17,
+      fontWeight: '600',
+      color: '#FFFFFF',
+    },
+
+    // 底部
+    footer: {
+      flexDirection: 'row',
+      justifyContent: 'center',
+      alignItems: 'center',
+      marginTop: 40,
+    },
+    footerText: {
+      fontSize: 15,
+      color: colors.text.secondary,
+    },
+    registerLink: {
+      fontSize: 15,
+      color: THEME_COLORS.primary,
+      fontWeight: '600',
+      marginLeft: 6,
+    },
   });
 }
 
-export default LoginScreen;
+export default LoginScreen;

src/screens/auth/WelcomeScreen.tsx

@@ -0,0 +1,265 @@
+/**
+ * 欢迎页 WelcomeScreen
+ * 胡萝卜BBS - 用户欢迎页
+ *
+ * 亮色模式：白色主色调 + 胡萝卜橙辅色
+ * 暗色模式：深色背景 + 胡萝卜橙辅色
+ */
+
+import React, { useEffect, useRef, useMemo } from 'react';
+import {
+  View,
+  Text,
+  StyleSheet,
+  TouchableOpacity,
+  Animated,
+  StatusBar,
+  Dimensions,
+} from 'react-native';
+import { SafeAreaView } from 'react-native-safe-area-context';
+import { useRouter } from 'expo-router';
+import { useAppColors, useResolvedColorScheme, type AppColors } from '../../theme';
+import * as hrefs from '../../navigation/hrefs';
+
+const { width, height } = Dimensions.get('window');
+
+export const WelcomeScreen: React.FC = () => {
+  const router = useRouter();
+  const colors = useAppColors();
+  const resolved = useResolvedColorScheme();
+  const styles = useMemo(() => createWelcomeStyles(colors), [colors]);
+  const isDark = resolved === 'dark';
+  
+  // 动画值
+  const fadeAnim = useRef(new Animated.Value(0)).current;
+  const slideUpAnim = useRef(new Animated.Value(50)).current;
+  const scaleAnim = useRef(new Animated.Value(0.9)).current;
+
+  useEffect(() => {
+    // 启动入场动画
+    Animated.parallel([
+      Animated.timing(fadeAnim, {
+        toValue: 1,
+        duration: 800,
+        useNativeDriver: true,
+      }),
+      Animated.timing(slideUpAnim, {
+        toValue: 0,
+        duration: 800,
+        useNativeDriver: true,
+      }),
+      Animated.timing(scaleAnim, {
+        toValue: 1,
+        duration: 800,
+        useNativeDriver: true,
+      }),
+    ]).start();
+  }, []);
+
+  const handleSignIn = () => {
+    router.push(hrefs.hrefAuthLogin());
+  };
+
+  const handleCreateAccount = () => {
+    router.push(hrefs.hrefAuthRegister());
+  };
+
+  return (
+    <View style={styles.container}>
+      <StatusBar barStyle={isDark ? 'light-content' : 'dark-content'} />
+      
+      {/* 装饰性背景元素 */}
+      <View style={styles.decorCircle1} />
+      <View style={styles.decorCircle2} />
+      <View style={styles.decorCircle3} />
+      
+      <SafeAreaView style={styles.safeArea}>
+        <Animated.View 
+          style={[
+            styles.content,
+            {
+              opacity: fadeAnim,
+              transform: [
+                { translateY: slideUpAnim },
+                { scale: scaleAnim },
+              ],
+            },
+          ]}
+        >
+            {/* 品牌区域 */}
+            <View style={styles.brandSection}>
+              <Text style={styles.welcomeEn}>Welcome To</Text>
+              <Text style={styles.brandName}>萝卜社区</Text>
+              <View style={styles.brandUnderline} />
+              
+              <Text style={styles.subtitle}>
+                发现有趣的内容{'\n'}
+                结识志同道合的朋友
+              </Text>
+            </View>
+          
+          {/* 按钮区域 */}
+          <View style={styles.buttonSection}>
+            <TouchableOpacity
+              style={styles.signInButton}
+              onPress={handleSignIn}
+              activeOpacity={0.8}
+            >
+              <Text style={styles.signInButtonText}>登录</Text>
+            </TouchableOpacity>
+            
+            <TouchableOpacity
+              style={styles.createAccountButton}
+              onPress={handleCreateAccount}
+              activeOpacity={0.8}
+            >
+              <Text style={styles.createAccountButtonText}>创建账号</Text>
+            </TouchableOpacity>
+          </View>
+        </Animated.View>
+      </SafeAreaView>
+    </View>
+  );
+};
+
+function createWelcomeStyles(colors: AppColors) {
+  return StyleSheet.create({
+    container: {
+      flex: 1,
+      backgroundColor: colors.background.default,
+    },
+    safeArea: {
+      flex: 1,
+    },
+    content: {
+      flex: 1,
+      justifyContent: 'space-between',
+      paddingHorizontal: 32,
+      paddingTop: 60,
+      paddingBottom: 40,
+    },
+    
+    // 装饰性背景元素 - 使用胡萝卜橙的淡色
+    decorCircle1: {
+      position: 'absolute',
+      top: -100,
+      right: -100,
+      width: 400,
+      height: 400,
+      borderRadius: 200,
+      backgroundColor: colors.primary.main + '08', // 非常淡的胡萝卜橙
+    },
+    decorCircle2: {
+      position: 'absolute',
+      top: height * 0.3,
+      left: -80,
+      width: 200,
+      height: 200,
+      borderRadius: 100,
+      backgroundColor: colors.primary.main + '10',
+    },
+    decorCircle3: {
+      position: 'absolute',
+      bottom: -50,
+      right: -50,
+      width: 250,
+      height: 250,
+      borderRadius: 125,
+      backgroundColor: colors.primary.main + '08',
+    },
+    
+    // 品牌区域
+    brandSection: {
+      alignItems: 'center',
+    },
+    badge: {
+      backgroundColor: colors.primary.main + '15',
+      paddingHorizontal: 20,
+      paddingVertical: 8,
+      borderRadius: 20,
+      marginBottom: 24,
+    },
+    badgeText: {
+      color: colors.primary.main,
+      fontSize: 14,
+      fontWeight: '600',
+      letterSpacing: 1,
+    },
+    welcomeEn: {
+      fontSize: 24,
+      fontWeight: '400',
+      color: colors.text.secondary,
+      marginBottom: 4,
+      letterSpacing: 1,
+    },
+    brandName: {
+      fontSize: 42,
+      fontWeight: '800',
+      color: colors.text.primary,
+      letterSpacing: 4,
+      marginBottom: 8,
+    },
+    brandUnderline: {
+      width: 80,
+      height: 4,
+      backgroundColor: colors.primary.main,
+      borderRadius: 2,
+      marginBottom: 24,
+    },
+    title: {
+      fontSize: 48,
+      fontWeight: '800',
+      color: colors.text.primary,
+      marginBottom: 16,
+      letterSpacing: 2,
+    },
+    subtitle: {
+      fontSize: 16,
+      color: colors.text.secondary,
+      textAlign: 'center',
+      lineHeight: 24,
+      letterSpacing: 0.5,
+    },
+    
+    // 按钮区域
+    buttonSection: {
+      width: '100%',
+      gap: 16,
+    },
+    signInButton: {
+      backgroundColor: colors.primary.main,
+      borderRadius: 16,
+      height: 56,
+      alignItems: 'center',
+      justifyContent: 'center',
+      shadowColor: colors.primary.main,
+      shadowOffset: { width: 0, height: 4 },
+      shadowOpacity: 0.3,
+      shadowRadius: 8,
+      elevation: 5,
+    },
+    signInButtonText: {
+      color: colors.primary.contrast,
+      fontSize: 16,
+      fontWeight: '700',
+      letterSpacing: 1,
+    },
+    createAccountButton: {
+      backgroundColor: 'transparent',
+      borderRadius: 16,
+      height: 56,
+      alignItems: 'center',
+      justifyContent: 'center',
+      borderWidth: 2,
+      borderColor: colors.primary.main,
+    },
+    createAccountButtonText: {
+      color: colors.primary.main,
+      fontSize: 16,
+      fontWeight: '700',
+      letterSpacing: 1,
+    },
+  });
+}
+
+export default WelcomeScreen;

src/screens/auth/index.ts

@@ -6,3 +6,4 @@
 export { LoginScreen } from './LoginScreen';
 export { RegisterScreen } from './RegisterScreen';
 export { ForgotPasswordScreen } from './ForgotPasswordScreen';
+export { WelcomeScreen } from './WelcomeScreen';