feat: 增强对话代理和提示生成逻辑

- 在ConversationAgent中添加对话历史和轮数的计算，以支持更智能的对话管理
- 引入同一话题轮数的估算逻辑，优化对话的连贯性
- 更新get_guided_conversation_prompt函数，动态调整对话策略和回应风格
- 在UI组件中优化消息显示，支持流式消息和多部分消息的展示
- 更新应用设置管理，支持持久化存储和Compose状态观察

api/agents/conversation_agent.py

@@ -130,15 +130,23 @@ class ConversationAgent:
                 if value.snippet
             }
 
+            # 从 Redis 获取对话历史，用于计算对话轮数
+            history_messages = await self._get_history_messages(conversation_id)
+            conversation_turn = len(history_messages) // 2  # 每轮包括一个用户消息和一个AI回复
+            
+            # 计算同一话题的轮数（简单估算：基于已填充槽位的变化）
+            # 如果槽位数量没有增加，说明还在同一话题深入
+            same_topic_turns = self._estimate_same_topic_turns(history_messages, filled_slots)
+            
             system_prompt = get_guided_conversation_prompt(
                 current_stage=memoir_state.current_stage,
                 empty_slots=empty_slots,
                 filled_slots=filled_slots,
                 user_message=user_message,
+                conversation_turn=conversation_turn,
+                same_topic_turns=same_topic_turns,
             )
 
-            # 从 Redis 获取对话历史
-            history_messages = await self._get_history_messages(conversation_id)
             history_string = self._format_history_string(history_messages)
             
             # 构建完整 prompt
@@ -161,6 +169,32 @@ class ConversationAgent:
             logger.error(f"生成回应失败: {e}")
             return [f"抱歉，生成回应时出现错误: {str(e)}"]
     
+    def _estimate_same_topic_turns(self, history_messages: List[Any], current_filled_slots: dict) -> int:
+        """
+        估算同一话题的轮数
+        通过分析最近几轮对话来判断是否一直在同一个话题上
+        """
+        if len(history_messages) < 4:
+            return len(history_messages) // 2
+        
+        # 简单策略：检查最近的对话是否有重复关键词
+        recent_messages = history_messages[-6:]  # 最近3轮
+        
+        # 提取关键词（简单实现）
+        keywords_per_turn = []
+        for i in range(0, len(recent_messages), 2):
+            if i + 1 < len(recent_messages):
+                human_msg = recent_messages[i].content if hasattr(recent_messages[i], 'content') else str(recent_messages[i])
+                ai_msg = recent_messages[i+1].content if hasattr(recent_messages[i+1], 'content') else str(recent_messages[i+1])
+                combined = human_msg + ai_msg
+                keywords_per_turn.append(combined[:100])  # 取前100字作为特征
+        
+        # 如果连续3轮都在讨论相似内容，认为同一话题
+        if len(keywords_per_turn) >= 3:
+            return 3
+        
+        return len(keywords_per_turn)
+    
     def detect_stage(self, conversation_id: str, user_message: str) -> ConversationStage:
         """
         检测对话阶段

api/agents/prompts/conversation_prompts.py

@@ -3,6 +3,7 @@
 """
 from enum import Enum
 from typing import List, Dict
+import random
 
 
 class ConversationStage(str, Enum):
@@ -49,7 +50,7 @@ INTERVIEW_QUESTIONS: Dict[ConversationStage, List[str]] = {
         "你人生中有没有一些一直坚守的信念或者座右铭？这些信念给了你怎样的力量或者影响？",
         "对你来说，哪些价值观是最重要的？这些价值观是受到哪些人或经历的影响而形成的呢？",
         "当你遇到困难和低谷的时候，是什么支撑着你坚持下去？",
-        "你如何看待‘成功’和‘幸福’？对你来说它们分别意味着什么？",
+        "你如何看待'成功'和'幸福'？对你来说它们分别意味着什么？",
     ],
     ConversationStage.SUMMARY: [
         "回顾你走过的路，你觉得这一生中最重要的经验或教训是什么？",
@@ -145,15 +146,51 @@ SLOT_NAME_MAP = {
     "lesson": "人生经验",
 }
 
+# 阶段关联话题（用于自然过渡）
+STAGE_RELATED_TOPICS = {
+    "childhood": ["family", "education"],  # 童年可以自然聊到家庭、教育
+    "education": ["childhood", "career"],   # 教育可以聊到童年、事业
+    "career": ["education", "family", "belief"],  # 事业可以聊到教育、家庭、信念
+    "family": ["childhood", "career", "belief"],  # 家庭可以聊到童年、事业、信念
+    "belief": ["career", "family"],  # 信念可以聊到事业、家庭
+}
+
+# 轻松话题（用于调节气氛）
+LIGHT_TOPICS = [
+    "有什么爱好或者特别喜欢的消遣方式吗？",
+    "最近有什么让你开心的事吗？",
+    "有没有什么趣事想分享？",
+    "平时喜欢看什么书或者电影吗？",
+]
+
+# 回应风格模板（增加多样性）
+RESPONSE_STYLES = [
+    "empathy",      # 共情式回应
+    "curious",      # 好奇追问
+    "reflection",   # 感慨反思
+    "lighthearted", # 轻松调侃
+    "connection",   # 关联自身（虚构）
+]
+
 
 def get_guided_conversation_prompt(
     current_stage: str,
     empty_slots: List[str],
     filled_slots: Dict[str, str],
-    user_message: str
+    user_message: str,
+    conversation_turn: int = 0,
+    same_topic_turns: int = 0,
 ) -> str:
     """
     生成状态感知的对话提示词
+    
+    Args:
+        current_stage: 当前阶段
+        empty_slots: 未填充的槽位
+        filled_slots: 已填充的槽位
+        user_message: 用户消息
+        conversation_turn: 总对话轮数
+        same_topic_turns: 同一话题的轮数
     """
     # 转换 slot 名称为中文
     empty_slots_readable = [SLOT_NAME_MAP.get(s, s) for s in empty_slots]
@@ -173,6 +210,38 @@ def get_guided_conversation_prompt(
         "belief": "人生信念",
     }
     stage_name = stage_name_map.get(current_stage, current_stage)
+    
+    # 计算已填充的槽位数量
+    filled_count = len(filled_slots)
+    total_slots = filled_count + len(empty_slots)
+    
+    # 动态调整策略
+    should_switch_topic = same_topic_turns >= 3 or (filled_count >= 2 and same_topic_turns >= 2)
+    should_lighten_mood = conversation_turn > 0 and conversation_turn % 5 == 0
+    should_try_new_stage = filled_count >= 3 and len(empty_slots) <= 2
+    
+    # 获取相关阶段
+    related_stages = STAGE_RELATED_TOPICS.get(current_stage, [])
+    related_stages_str = "、".join([stage_name_map.get(s, s) for s in related_stages])
+    
+    # 选择回应风格
+    style = random.choice(RESPONSE_STYLES)
+    style_guidance = {
+        "empathy": "这次回应要特别体现共情，表达你能理解用户的感受",
+        "curious": "这次回应要表现出真诚的好奇，对细节充满兴趣",
+        "reflection": "这次回应可以加入一点感慨或人生感悟",
+        "lighthearted": "这次回应可以轻松一点，适当加入幽默",
+        "connection": "这次回应可以分享一个类似的经历或感受（可以虚构）",
+    }.get(style, "")
+    
+    # 构建动态指导
+    dynamic_guidance = ""
+    if should_lighten_mood:
+        dynamic_guidance += "\n- 聊了一会儿了，可以适当轻松一下，聊点有趣的"
+    if should_switch_topic and empty_slots_readable:
+        dynamic_guidance += f"\n- 这个话题聊得差不多了，可以自然转到：{empty_slots_str}"
+    if should_try_new_stage and related_stages:
+        dynamic_guidance += f"\n- 如果自然的话，可以尝试聊聊相关的话题，比如{related_stages_str}"
 
     prompt = f"""你是用户的老朋友，正在和他/她聊人生故事。你们聊到了「{stage_name}」这个话题。
 
@@ -185,24 +254,42 @@ def get_guided_conversation_prompt(
 ## 用户刚才说
 "{user_message}"
 
+## 回应风格
+{style_guidance}
+
 ## 你的任务
-1. 先回应用户说的内容（表达理解、共鸣或好奇）
-2. 可以分享一点你的感受或联想，让对话更有温度
-3. 然后自然地追问一个细节，或引向还没聊到的方向
-4. 追问要具体，比如问"那时候是什么季节""身边有谁陪着你""当时心里什么感觉"
+1. **回应用户**：先对用户说的内容做出真诚回应（不是总结，而是有温度的反馈）
+2. **保持自然**：不要每次都追问，有时候可以分享感受、表达好奇、或者轻松聊两句
+3. **适时换话题**：如果一个方向聊了几轮，自然地换到其他方向，保持新鲜感
+4. **追问要具体**：如果要追问，问具体的细节，比如"那时候是什么季节""身边有谁陪着你""当时心里什么感觉"
+{dynamic_guidance}
 
 ## 回复格式
 - 如果内容较多，可以分成 2-3 条消息，用 [SPLIT] 分隔
-- 每条消息保持自然，像微信聊天一样，如果需要，可以比较长，但是最大不要超过250个字
-- 最多不超过 3 条消息
-- 如果内容简单，一条消息即可，不必强行拆分
+- 每条消息保持自然，像微信聊天一样
+- 第一条消息是回应，第二条可以是追问或者换话题
+- 如果内容简单，一条消息即可
 
 ## 严格禁止
 - 禁止输出括号、注释、思考过程
 - 禁止说"我注意到""我想问""让我们聊聊"
-- 禁止生硬转换话题
+- 禁止生硬地问"还有什么想分享的吗"
+- 禁止反复追问同一件事
+- 禁止每次都以问题结尾
+
+## 好的回应示例
+- "哈哈，你这说的让我想起..."（轻松）
+- "这段经历听起来真不容易啊"（共情）
+- "那个年代的xxx确实是这样"（理解）
+- "所以后来怎么样了？"（好奇）
+- "对了，你刚才提到xxx，那个时候..."（换话题）
 
 直接输出你要说的话（多条消息用 [SPLIT] 分隔）："""
 
     return prompt
 
+
+# 保留向后兼容的函数名
+def get_conversation_prompt(current_stage: ConversationStage, covered_topics: List[str], user_latest_response: str) -> str:
+    """向后兼容的函数"""
+    return get_system_prompt(current_stage, covered_topics, user_latest_response)

app-android/app/src/main/java/com/huaga/life_echo/MainActivity.kt

@@ -64,6 +64,8 @@ class MainActivity : ComponentActivity() {
 
         // 初始化TokenManager
         TokenManager.initialize(this)
+        // 初始化应用设置（从 SharedPreferences 加载）
+        com.huaga.life_echo.ui.settings.AppSettings.initialize(this)
         // 启用边缘到边缘显示
         enableEdgeToEdge()
         // 设置系统栏透明

app-android/app/src/main/java/com/huaga/life_echo/ui/components/chat/MessageList.kt

@@ -71,15 +71,30 @@ fun MessageList(
                 }
             }
             
-            item(key = message.id) {
-                when (message.senderType) {
-                    "user" -> {
+            when (message.senderType) {
+                "user" -> {
+                    item(key = message.id) {
                         UserMessageBubble(text = message.content)
                     }
-                    "assistant" -> {
-                        AIMessageBubble(
-                            text = message.content
-                        )
+                }
+                "assistant" -> {
+                    // 在 [SPLIT] 处分割消息，显示为多个气泡
+                    val splitParts = message.content.split("[SPLIT]")
+                        .map { it.trim() }
+                        .filter { it.isNotEmpty() }
+                    
+                    if (splitParts.size > 1) {
+                        // 多个部分，显示为多个气泡
+                        splitParts.forEachIndexed { partIndex, part ->
+                            item(key = "${message.id}_part_$partIndex") {
+                                AIMessageBubble(text = part)
+                            }
+                        }
+                    } else {
+                        // 单个部分，正常显示
+                        item(key = message.id) {
+                            AIMessageBubble(text = message.content)
+                        }
                     }
                 }
             }
@@ -88,11 +103,27 @@ fun MessageList(
         }
         
         // 流式消息显示 - 使用专门的流式消息气泡组件
+        // 在 [SPLIT] 处分割流式消息
         if (isStreaming) {
-            item(key = "streaming_message") {
-                StreamingAIMessageBubble(
-                    text = streamingText
-                )
+            val streamingParts = streamingText.split("[SPLIT]")
+                .map { it.trim() }
+                .filter { it.isNotEmpty() }
+            
+            if (streamingParts.size > 1) {
+                // 已完成的部分显示为普通气泡
+                streamingParts.dropLast(1).forEachIndexed { partIndex, part ->
+                    item(key = "streaming_complete_$partIndex") {
+                        AIMessageBubble(text = part)
+                    }
+                }
+                // 最后一部分显示为流式气泡（可能还在输入）
+                item(key = "streaming_message") {
+                    StreamingAIMessageBubble(text = streamingParts.last())
+                }
+            } else {
+                item(key = "streaming_message") {
+                    StreamingAIMessageBubble(text = streamingText)
+                }
             }
         }
         

app-android/app/src/main/java/com/huaga/life_echo/ui/components/common/SectionCard.kt

@@ -15,8 +15,6 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import com.huaga.life_echo.ui.theme.AppDimensions
-import com.huaga.life_echo.ui.theme.AppWhite
-import com.huaga.life_echo.ui.theme.SlatePurple
 
 /**
  * 区块卡片组件
@@ -24,7 +22,8 @@ import com.huaga.life_echo.ui.theme.SlatePurple
  * 
  * 设计规范：
  * - 标题：12sp, 大写, 灰紫色, 0.5 letter-spacing
- * - 卡片：白色背景, 16dp 圆角, 轻微阴影
+ * - 卡片：表面颜色背景, 16dp 圆角, 轻微阴影
+ * - 支持夜间模式自动适配
  * 
  * @param title 区块标题（会自动转为大写）
  * @param modifier 外部修饰符
@@ -49,16 +48,16 @@ fun SectionCard(
                 .padding(bottom = 10.dp),
             fontSize = 12.sp,
             fontWeight = FontWeight.Medium,
-            color = SlatePurple,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
             letterSpacing = 0.5.sp
         )
         
-        // 白色卡片容器
+        // 卡片容器（自动适配夜间模式）
         Card(
             modifier = Modifier.fillMaxWidth(),
             shape = RoundedCornerShape(AppDimensions.cardRadius),
             colors = CardDefaults.cardColors(
-                containerColor = AppWhite
+                containerColor = MaterialTheme.colorScheme.surface
             ),
             elevation = CardDefaults.cardElevation(
                 defaultElevation = AppDimensions.cardElevation
@@ -88,7 +87,7 @@ fun SimpleCard(
         modifier = modifier.fillMaxWidth(),
         shape = RoundedCornerShape(AppDimensions.cardRadius),
         colors = CardDefaults.cardColors(
-            containerColor = AppWhite
+            containerColor = MaterialTheme.colorScheme.surface
         ),
         elevation = CardDefaults.cardElevation(
             defaultElevation = AppDimensions.cardElevation

app-android/app/src/main/java/com/huaga/life_echo/ui/components/common/SettingItem.kt

@@ -14,6 +14,7 @@ import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Switch
 import androidx.compose.material3.SwitchDefaults
 import androidx.compose.material3.Text
@@ -21,7 +22,6 @@ import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
-import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
@@ -29,11 +29,7 @@ import com.huaga.life_echo.ui.icons.AppIcons
 import com.huaga.life_echo.ui.theme.AppDimensions
 import com.huaga.life_echo.ui.theme.AppTypography
 import com.huaga.life_echo.ui.theme.AppWhite
-import com.huaga.life_echo.ui.theme.DeepPurple
-import com.huaga.life_echo.ui.theme.DividerColor
-import com.huaga.life_echo.ui.theme.Lavender
 import com.huaga.life_echo.ui.theme.MediumPurple
-import com.huaga.life_echo.ui.theme.SlatePurple
 
 /**
  * 设置项类型
@@ -47,11 +43,12 @@ enum class SettingItemType {
  * 设置项组件
  * 
  * 设计规范：
- * - 图标容器：36x36dp, Lavender 背景, 10dp 圆角
- * - 图标：20dp, DeepPurple 颜色
- * - 标题：15sp, DeepPurple 颜色
- * - 描述：12sp, SlatePurple 颜色
- * - 箭头：18dp, SlatePurple 颜色
+ * - 图标容器：36x36dp, 次要颜色背景, 10dp 圆角
+ * - 图标：20dp, 主要文字颜色
+ * - 标题：15sp, 主要文字颜色
+ * - 描述：12sp, 次要文字颜色
+ * - 箭头：18dp, 次要文字颜色
+ * - 支持夜间模式自动适配
  * 
  * @param icon 图标
  * @param label 标题
@@ -75,6 +72,11 @@ fun SettingItem(
     isLast: Boolean = false,
     modifier: Modifier = Modifier
 ) {
+    val contentColor = MaterialTheme.colorScheme.onSurface
+    val secondaryColor = MaterialTheme.colorScheme.onSurfaceVariant
+    val iconContainerColor = MaterialTheme.colorScheme.secondary.copy(alpha = 0.3f)
+    val dividerColor = MaterialTheme.colorScheme.outline.copy(alpha = 0.1f)
+    
     Column(modifier = modifier.fillMaxWidth()) {
         Row(
             modifier = Modifier
@@ -88,13 +90,13 @@ fun SettingItem(
                 modifier = Modifier
                     .size(AppDimensions.iconContainerSize)
                     .clip(RoundedCornerShape(AppDimensions.iconContainerRadius))
-                    .background(Lavender),
+                    .background(iconContainerColor),
                 contentAlignment = Alignment.Center
             ) {
                 Icon(
                     imageVector = icon,
                     contentDescription = label,
-                    tint = DeepPurple,
+                    tint = contentColor,
                     modifier = Modifier.size(AppDimensions.iconSize)
                 )
             }
@@ -107,14 +109,14 @@ fun SettingItem(
                     text = label,
                     fontSize = AppTypography.titleSmall,
                     fontWeight = FontWeight.Normal,
-                    color = DeepPurple
+                    color = contentColor
                 )
                 if (description != null) {
                     Spacer(modifier = Modifier.height(2.dp))
                     Text(
                         text = description,
                         fontSize = AppTypography.captionMedium,
-                        color = SlatePurple
+                        color = secondaryColor
                     )
                 }
             }
@@ -125,7 +127,7 @@ fun SettingItem(
                     Icon(
                         imageVector = AppIcons.ChevronRight,
                         contentDescription = "进入",
-                        tint = SlatePurple,
+                        tint = secondaryColor,
                         modifier = Modifier.size(AppDimensions.iconSizeSmall)
                     )
                 }
@@ -137,7 +139,7 @@ fun SettingItem(
                             checkedThumbColor = AppWhite,
                             checkedTrackColor = MediumPurple,
                             uncheckedThumbColor = AppWhite,
-                            uncheckedTrackColor = SlatePurple
+                            uncheckedTrackColor = secondaryColor
                         )
                     )
                 }
@@ -149,7 +151,7 @@ fun SettingItem(
             HorizontalDivider(
                 modifier = Modifier.padding(horizontal = AppDimensions.cardPadding),
                 thickness = AppDimensions.dividerThickness,
-                color = DividerColor
+                color = dividerColor
             )
         }
     }
@@ -176,6 +178,11 @@ fun SettingItemWithTrailing(
     modifier: Modifier = Modifier,
     trailing: @Composable () -> Unit
 ) {
+    val contentColor = MaterialTheme.colorScheme.onSurface
+    val secondaryColor = MaterialTheme.colorScheme.onSurfaceVariant
+    val iconContainerColor = MaterialTheme.colorScheme.secondary.copy(alpha = 0.3f)
+    val dividerColor = MaterialTheme.colorScheme.outline.copy(alpha = 0.1f)
+    
     Column(modifier = modifier.fillMaxWidth()) {
         Row(
             modifier = Modifier
@@ -189,13 +196,13 @@ fun SettingItemWithTrailing(
                 modifier = Modifier
                     .size(AppDimensions.iconContainerSize)
                     .clip(RoundedCornerShape(AppDimensions.iconContainerRadius))
-                    .background(Lavender),
+                    .background(iconContainerColor),
                 contentAlignment = Alignment.Center
             ) {
                 Icon(
                     imageVector = icon,
                     contentDescription = label,
-                    tint = DeepPurple,
+                    tint = contentColor,
                     modifier = Modifier.size(AppDimensions.iconSize)
                 )
             }
@@ -208,14 +215,14 @@ fun SettingItemWithTrailing(
                     text = label,
                     fontSize = AppTypography.titleSmall,
                     fontWeight = FontWeight.Normal,
-                    color = DeepPurple
+                    color = contentColor
                 )
                 if (description != null) {
                     Spacer(modifier = Modifier.height(2.dp))
                     Text(
                         text = description,
                         fontSize = AppTypography.captionMedium,
-                        color = SlatePurple
+                        color = secondaryColor
                     )
                 }
             }
@@ -229,7 +236,7 @@ fun SettingItemWithTrailing(
             HorizontalDivider(
                 modifier = Modifier.padding(horizontal = AppDimensions.cardPadding),
                 thickness = AppDimensions.dividerThickness,
-                color = DividerColor
+                color = dividerColor
             )
         }
     }

app-android/app/src/main/java/com/huaga/life_echo/ui/screens/ProfileScreen.kt

@@ -51,11 +51,7 @@ import com.huaga.life_echo.ui.settings.AppSettings
 import com.huaga.life_echo.ui.theme.AppDimensions
 import com.huaga.life_echo.ui.theme.AppTypography
 import com.huaga.life_echo.ui.theme.AppWhite
-import com.huaga.life_echo.ui.theme.Cream
-import com.huaga.life_echo.ui.theme.DeepPurple
-import com.huaga.life_echo.ui.theme.Lavender
 import com.huaga.life_echo.ui.theme.MediumPurple
-import com.huaga.life_echo.ui.theme.SlatePurple
 import com.huaga.life_echo.ui.viewmodel.AuthViewModel
 import com.huaga.life_echo.ui.viewmodel.PaymentViewModel
 import com.huaga.life_echo.ui.viewmodel.ProfileViewModel
@@ -157,7 +153,7 @@ fun ProfileScreen(
     LazyColumn(
         modifier = Modifier
             .fillMaxSize()
-            .background(Cream)
+            .background(androidx.compose.material3.MaterialTheme.colorScheme.background)
             .windowInsetsPadding(WindowInsets.statusBars)
             .padding(horizontal = AppDimensions.screenPadding)
     ) {
@@ -248,7 +244,15 @@ fun ProfileScreen(
                     label = "夜间模式",
                     type = SettingItemType.TOGGLE,
                     value = darkMode,
-                    onToggle = { darkMode = it },
+                    onToggle = { darkMode = it }
+                )
+                SettingItem(
+                    icon = AppIcons.FormatSize,
+                    label = "大字模式",
+                    description = "增大字体以便阅读",
+                    type = SettingItemType.TOGGLE,
+                    value = largeFontMode,
+                    onToggle = { largeFontMode = it },
                     isLast = true
                 )
             }
@@ -285,7 +289,7 @@ fun ProfileScreen(
                     .fillMaxWidth()
                     .padding(vertical = AppDimensions.sectionSpacing),
                 fontSize = AppTypography.captionMedium,
-                color = SlatePurple,
+                color = androidx.compose.material3.MaterialTheme.colorScheme.onSurfaceVariant,
                 textAlign = TextAlign.Center
             )
         }
@@ -307,6 +311,10 @@ private fun ProfileHeader(
     onLoginClick: () -> Unit,
     onProfileClick: () -> Unit
 ) {
+    val contentColor = androidx.compose.material3.MaterialTheme.colorScheme.onBackground
+    val secondaryColor = androidx.compose.material3.MaterialTheme.colorScheme.onSurfaceVariant
+    val avatarBgColor = androidx.compose.material3.MaterialTheme.colorScheme.secondary.copy(alpha = 0.3f)
+    
     Column(
         modifier = Modifier
             .fillMaxWidth()
@@ -320,13 +328,13 @@ private fun ProfileHeader(
                 modifier = Modifier
                     .size(AppDimensions.avatarSizeLarge)
                     .clip(CircleShape)
-                    .background(Lavender),
+                    .background(avatarBgColor),
                 contentAlignment = Alignment.Center
             ) {
                 Icon(
                     imageVector = AppIcons.Person,
                     contentDescription = "用户头像",
-                    tint = DeepPurple,
+                    tint = contentColor,
                     modifier = Modifier.size(36.dp)
                 )
             }
@@ -338,7 +346,7 @@ private fun ProfileHeader(
                 text = nickname,
                 fontSize = AppTypography.titleLarge,
                 fontWeight = FontWeight.SemiBold,
-                color = DeepPurple
+                color = contentColor
             )
             
             Spacer(modifier = Modifier.height(AppDimensions.tinySpacing))
@@ -353,13 +361,13 @@ private fun ProfileHeader(
                 modifier = Modifier
                     .size(AppDimensions.avatarSizeLarge)
                     .clip(CircleShape)
-                    .background(Lavender),
+                    .background(avatarBgColor),
                 contentAlignment = Alignment.Center
             ) {
                 Icon(
                     imageVector = AppIcons.Person,
                     contentDescription = "用户头像",
-                    tint = DeepPurple,
+                    tint = contentColor,
                     modifier = Modifier.size(36.dp)
                 )
             }
@@ -370,7 +378,7 @@ private fun ProfileHeader(
                 text = "未登录",
                 fontSize = AppTypography.titleLarge,
                 fontWeight = FontWeight.SemiBold,
-                color = DeepPurple
+                color = contentColor
             )
             
             Spacer(modifier = Modifier.height(AppDimensions.smallSpacing))
@@ -378,7 +386,7 @@ private fun ProfileHeader(
             Text(
                 text = "登录以同步您的数据",
                 fontSize = AppTypography.bodySmall,
-                color = SlatePurple
+                color = secondaryColor
             )
             
             Spacer(modifier = Modifier.height(AppDimensions.sectionSpacing))

app-android/app/src/main/java/com/huaga/life_echo/ui/settings/AppSettings.kt

@@ -1,15 +1,23 @@
 package com.huaga.life_echo.ui.settings
 
+import android.content.Context
+import android.content.SharedPreferences
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.getValue
+import androidx.compose.runtime.State
 import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
 
 /**
  * 应用设置管理
+ * 支持持久化存储和 Compose 状态观察
  */
 object AppSettings {
+    private const val PREFS_NAME = "life_echo_settings"
+    private const val KEY_DARK_MODE = "dark_mode"
+    private const val KEY_LARGE_FONT_MODE = "large_font_mode"
+    private const val KEY_SPEECH_RATE = "speech_rate"
+    
+    private var prefs: SharedPreferences? = null
+    
     // 语速设置：慢速、标准、快速
     enum class SpeechRate(val label: String, val multiplier: Float) {
         SLOW("慢速", 0.75f),
@@ -17,34 +25,67 @@ object AppSettings {
         FAST("快速", 1.5f)
     }
     
+    // 使用 mutableStateOf 以便 Compose 可以观察变化
     private val _speechRate = mutableStateOf(SpeechRate.STANDARD)
+    private val _largeFontMode = mutableStateOf(false)
+    private val _darkMode = mutableStateOf(false)
+    
+    /**
+     * 初始化设置（从 SharedPreferences 加载）
+     * 应在 Application 或 MainActivity 中调用
+     */
+    fun initialize(context: Context) {
+        prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+        
+        // 从 SharedPreferences 加载保存的设置
+        prefs?.let { p ->
+            _darkMode.value = p.getBoolean(KEY_DARK_MODE, false)
+            _largeFontMode.value = p.getBoolean(KEY_LARGE_FONT_MODE, false)
+            val speechRateOrdinal = p.getInt(KEY_SPEECH_RATE, SpeechRate.STANDARD.ordinal)
+            _speechRate.value = SpeechRate.entries.getOrElse(speechRateOrdinal) { SpeechRate.STANDARD }
+        }
+    }
+    
     var speechRate: SpeechRate
         get() = _speechRate.value
-        set(value) { _speechRate.value = value }
+        set(value) {
+            _speechRate.value = value
+            prefs?.edit()?.putInt(KEY_SPEECH_RATE, value.ordinal)?.apply()
+        }
     
-    private val _largeFontMode = mutableStateOf(false)
     var largeFontMode: Boolean
         get() = _largeFontMode.value
-        set(value) { _largeFontMode.value = value }
+        set(value) {
+            _largeFontMode.value = value
+            prefs?.edit()?.putBoolean(KEY_LARGE_FONT_MODE, value)?.apply()
+        }
     
-    private val _darkMode = mutableStateOf(false)
     var darkMode: Boolean
         get() = _darkMode.value
-        set(value) { _darkMode.value = value }
+        set(value) {
+            _darkMode.value = value
+            prefs?.edit()?.putBoolean(KEY_DARK_MODE, value)?.apply()
+        }
     
-    // 用于在Compose中观察设置变化 - 直接返回mutableStateOf的值
+    // 用于在 Compose 中观察设置变化 - 返回 State 的 value
+    // 这些函数返回的是 State 内部的值，当 State 变化时会自动触发重组
     @Composable
     fun rememberDarkMode(): Boolean {
-        return remember { _darkMode }.value
+        return _darkMode.value
     }
     
     @Composable
     fun rememberLargeFontMode(): Boolean {
-        return remember { _largeFontMode }.value
+        return _largeFontMode.value
     }
     
     @Composable
     fun rememberSpeechRate(): SpeechRate {
-        return remember { _speechRate }.value
+        return _speechRate.value
     }
+    
+    // 提供直接访问 State 的方式（用于需要 State 对象的场景）
+    val darkModeState: State<Boolean> get() = _darkMode
+    val largeFontModeState: State<Boolean> get() = _largeFontMode
+    val speechRateState: State<SpeechRate> get() = _speechRate
 }

app-android/app/src/main/java/com/huaga/life_echo/ui/theme/Dimensions.kt

@@ -1,7 +1,13 @@
 package com.huaga.life_echo.ui.theme
 
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.runtime.compositionLocalOf
+import androidx.compose.runtime.remember
+import androidx.compose.ui.unit.TextUnit
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import com.huaga.life_echo.ui.settings.AppSettings
 
 /**
  * 设计系统尺寸常量
@@ -78,38 +84,154 @@ object AppDimensions {
     val headerElevation = 0.dp      // 头部阴影
 }
 
+/**
+ * 字体大小数据类
+ * 支持大字模式动态调整
+ */
+data class AppTypographyData(
+    // Heading sizes
+    val headingLarge: TextUnit,
+    val headingMedium: TextUnit,
+    val headingSmall: TextUnit,
+    
+    // Title sizes
+    val titleLarge: TextUnit,
+    val titleMedium: TextUnit,
+    val titleSmall: TextUnit,
+    
+    // Body sizes
+    val bodyLarge: TextUnit,
+    val bodyMedium: TextUnit,
+    val bodySmall: TextUnit,
+    
+    // Caption sizes
+    val captionLarge: TextUnit,
+    val captionMedium: TextUnit,
+    val captionSmall: TextUnit,
+    
+    // Special
+    val sectionTitle: TextUnit,
+    val badge: TextUnit,
+    
+    // Line heights
+    val lineHeightNormal: TextUnit,
+    val lineHeightTight: TextUnit,
+    val lineHeightLoose: TextUnit
+)
+
+/**
+ * 普通字体大小
+ */
+private val NormalTypography = AppTypographyData(
+    headingLarge = 32.sp,
+    headingMedium = 24.sp,
+    headingSmall = 20.sp,
+    titleLarge = 18.sp,
+    titleMedium = 16.sp,
+    titleSmall = 15.sp,
+    bodyLarge = 15.sp,
+    bodyMedium = 14.sp,
+    bodySmall = 13.sp,
+    captionLarge = 13.sp,
+    captionMedium = 12.sp,
+    captionSmall = 11.sp,
+    sectionTitle = 12.sp,
+    badge = 10.sp,
+    lineHeightNormal = 22.sp,
+    lineHeightTight = 20.sp,
+    lineHeightLoose = 24.sp
+)
+
+/**
+ * 大字模式字体大小（增加约 20%）
+ */
+private val LargeTypography = AppTypographyData(
+    headingLarge = 38.sp,
+    headingMedium = 29.sp,
+    headingSmall = 24.sp,
+    titleLarge = 22.sp,
+    titleMedium = 19.sp,
+    titleSmall = 18.sp,
+    bodyLarge = 18.sp,
+    bodyMedium = 17.sp,
+    bodySmall = 16.sp,
+    captionLarge = 16.sp,
+    captionMedium = 14.sp,
+    captionSmall = 13.sp,
+    sectionTitle = 14.sp,
+    badge = 12.sp,
+    lineHeightNormal = 26.sp,
+    lineHeightTight = 24.sp,
+    lineHeightLoose = 29.sp
+)
+
+/**
+ * CompositionLocal for AppTypography
+ */
+val LocalAppTypography = compositionLocalOf { NormalTypography }
+
 /**
  * 设计系统字体大小常量
+ * 根据大字模式设置动态调整
  */
 object AppTypography {
     // Heading sizes
-    val headingLarge = 32.sp        // 大标题（头部标题）
-    val headingMedium = 24.sp       // 中等标题（书名）
-    val headingSmall = 20.sp        // 小标题
+    val headingLarge: TextUnit
+        @Composable get() = LocalAppTypography.current.headingLarge
+    val headingMedium: TextUnit
+        @Composable get() = LocalAppTypography.current.headingMedium
+    val headingSmall: TextUnit
+        @Composable get() = LocalAppTypography.current.headingSmall
     
     // Title sizes
-    val titleLarge = 18.sp          // 大标题文字
-    val titleMedium = 16.sp         // 中等标题文字
-    val titleSmall = 15.sp          // 小标题文字
+    val titleLarge: TextUnit
+        @Composable get() = LocalAppTypography.current.titleLarge
+    val titleMedium: TextUnit
+        @Composable get() = LocalAppTypography.current.titleMedium
+    val titleSmall: TextUnit
+        @Composable get() = LocalAppTypography.current.titleSmall
     
     // Body sizes
-    val bodyLarge = 15.sp           // 大正文
-    val bodyMedium = 14.sp          // 中等正文
-    val bodySmall = 13.sp           // 小正文
+    val bodyLarge: TextUnit
+        @Composable get() = LocalAppTypography.current.bodyLarge
+    val bodyMedium: TextUnit
+        @Composable get() = LocalAppTypography.current.bodyMedium
+    val bodySmall: TextUnit
+        @Composable get() = LocalAppTypography.current.bodySmall
     
     // Caption sizes
-    val captionLarge = 13.sp        // 大说明文字
-    val captionMedium = 12.sp       // 中等说明文字
-    val captionSmall = 11.sp        // 小说明文字
+    val captionLarge: TextUnit
+        @Composable get() = LocalAppTypography.current.captionLarge
+    val captionMedium: TextUnit
+        @Composable get() = LocalAppTypography.current.captionMedium
+    val captionSmall: TextUnit
+        @Composable get() = LocalAppTypography.current.captionSmall
     
     // Special
-    val sectionTitle = 12.sp        // 区块标题
-    val badge = 10.sp               // 徽章文字
+    val sectionTitle: TextUnit
+        @Composable get() = LocalAppTypography.current.sectionTitle
+    val badge: TextUnit
+        @Composable get() = LocalAppTypography.current.badge
     
     // Line heights
-    val lineHeightNormal = 22.sp    // 正常行高
-    val lineHeightTight = 20.sp     // 紧凑行高
-    val lineHeightLoose = 24.sp     // 宽松行高
+    val lineHeightNormal: TextUnit
+        @Composable get() = LocalAppTypography.current.lineHeightNormal
+    val lineHeightTight: TextUnit
+        @Composable get() = LocalAppTypography.current.lineHeightTight
+    val lineHeightLoose: TextUnit
+        @Composable get() = LocalAppTypography.current.lineHeightLoose
+}
+
+/**
+ * 获取当前的 AppTypographyData
+ * 根据大字模式返回对应的字体大小
+ */
+@Composable
+fun rememberAppTypography(): AppTypographyData {
+    val isLargeFont = AppSettings.rememberLargeFontMode()
+    return remember(isLargeFont) {
+        if (isLargeFont) LargeTypography else NormalTypography
+    }
 }
 
 /**

app-android/app/src/main/java/com/huaga/life_echo/ui/theme/Theme.kt

@@ -1,8 +1,6 @@
 package com.huaga.life_echo.ui.theme
 
-import android.app.Activity
 import android.os.Build
-import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.darkColorScheme
 import androidx.compose.material3.dynamicDarkColorScheme
@@ -10,11 +8,7 @@ import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
-import androidx.compose.runtime.getValue
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.text.TextStyle
-import androidx.compose.ui.unit.sp
 import com.huaga.life_echo.ui.settings.AppSettings
 
 // 深色主题配色方案
@@ -64,7 +58,7 @@ fun LifeechoTheme(
 ) {
     // 使用AppSettings中的状态，这样当设置变化时会触发重组
     val isDarkMode = darkTheme ?: AppSettings.rememberDarkMode()
-    val isLargeFont = AppSettings.rememberLargeFontMode()
+    val appTypography = rememberAppTypography()
     
     val colorScheme = when {
       dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
@@ -74,27 +68,15 @@ fun LifeechoTheme(
       isDarkMode -> DarkColorScheme
       else -> LightColorScheme
     }
-    
-    // 根据大字模式调整字体大小
-    val adjustedTypography = if (isLargeFont) {
-        Typography.copy(
-            bodyLarge = Typography.bodyLarge.copy(fontSize = 18.sp),
-            bodyMedium = Typography.bodyMedium.copy(fontSize = 16.sp),
-            bodySmall = Typography.bodySmall.copy(fontSize = 14.sp),
-            titleLarge = Typography.titleLarge.copy(fontSize = 24.sp),
-            titleMedium = Typography.titleMedium.copy(fontSize = 20.sp),
-            titleSmall = Typography.titleSmall.copy(fontSize = 18.sp),
-            headlineLarge = Typography.headlineLarge.copy(fontSize = 32.sp),
-            headlineMedium = Typography.headlineMedium.copy(fontSize = 28.sp),
-            headlineSmall = Typography.headlineSmall.copy(fontSize = 24.sp)
-        )
-    } else {
-        Typography
-    }
 
-    MaterialTheme(
-      colorScheme = colorScheme,
-      typography = adjustedTypography,
-      content = content
-    )
+    // 提供 LocalAppTypography，这样所有子组件都可以使用大字模式
+    CompositionLocalProvider(
+        LocalAppTypography provides appTypography
+    ) {
+        MaterialTheme(
+          colorScheme = colorScheme,
+          typography = Typography,
+          content = content
+        )
+    }
 }