diff --git a/app/src/main/java/com/unogame/ui/screens/LocalGameScreen.kt b/app/src/main/java/com/unogame/ui/screens/LocalGameScreen.kt
index ee7a686..bdaf84b 100644
--- a/app/src/main/java/com/unogame/ui/screens/LocalGameScreen.kt
+++ b/app/src/main/java/com/unogame/ui/screens/LocalGameScreen.kt
@@ -38,7 +38,8 @@ data class ScoreEntry(
     val duration: Int,
     val playerCount: Int,
     val turnNumber: Int,
-    val date: Long
+    val date: Long,
+    val scoreDetail: String = ""
 )
 
 object Scoreboard {
@@ -66,7 +67,8 @@ object Scoreboard {
         difficulty: String,
         duration: Int,
         playerCount: Int,
-        turnNumber: Int
+        turnNumber: Int,
+        scoreDetail: String = ""
     ) {
         val scores = loadScores(context).toMutableList()
         scores.add(
@@ -78,7 +80,8 @@ object Scoreboard {
                 duration = duration,
                 playerCount = playerCount,
                 turnNumber = turnNumber,
-                date = System.currentTimeMillis()
+                date = System.currentTimeMillis(),
+                scoreDetail = scoreDetail
             )
         )
         saveScores(context, scores.sortedByDescending { it.points }.take(50))
@@ -158,6 +161,15 @@ fun LocalGameScreen(
                         active.score
                     }
                 }
+                val scoreDetails = state.players.filter { it.id != myPlayerId }.flatMap { player ->
+                    player.cards.map { card ->
+                        val active = if (state.flipped && card.flipSide != null) card.flipSide else card
+                        val label = if (active.type == CardType.NUMBER) "${active.color.displayName}${active.number}"
+                            else "${active.color.displayName}${active.type.symbol}"
+                        "${label}(${active.score}分)"
+                    }
+                }
+                val detailStr = scoreDetails.joinToString(", ")
                 Scoreboard.addEntry(
                     context = context,
                     name = humanPlayerName,
@@ -166,7 +178,8 @@ fun LocalGameScreen(
                     difficulty = gameDifficulty,
                     duration = gameDuration,
                     playerCount = totalPlayers,
-                    turnNumber = gameTurnNumber
+                    turnNumber = gameTurnNumber,
+                    scoreDetail = detailStr
                 )
             }
         }
@@ -315,7 +328,7 @@ fun LocalGameScreen(
                     gameLog.forEachIndexed { index, msg ->
                         Row(modifier = Modifier.padding(vertical = 2.dp)) {
                             Text(
-                                "${index + 1}. ",
+                                "${gameLog.size - index}. ",
                                 color = Color.White.copy(alpha = 0.3f),
                                 fontSize = 12.sp
                             )
diff --git a/app/src/main/java/com/unogame/ui/screens/MainMenuScreen.kt b/app/src/main/java/com/unogame/ui/screens/MainMenuScreen.kt
index dcc31b9..922d780 100644
--- a/app/src/main/java/com/unogame/ui/screens/MainMenuScreen.kt
+++ b/app/src/main/java/com/unogame/ui/screens/MainMenuScreen.kt
@@ -38,6 +38,7 @@ fun MainMenuScreen(
     onNameChanged: (String) -> Unit
 ) {
     var playerName by remember { mutableStateOf(initialName) }
+    var showAbout by remember { mutableStateOf(false) }
 
     Box(
         modifier = Modifier
@@ -225,6 +226,15 @@ fun MainMenuScreen(
 
             Spacer(modifier = Modifier.height(16.dp))
 
+            // About button
+            TextButton(onClick = { showAbout = true }) {
+                Icon(Icons.Default.Info, null, tint = Color.White.copy(alpha = 0.5f))
+                Spacer(modifier = Modifier.width(6.dp))
+                Text("关于", color = Color.White.copy(alpha = 0.5f), fontSize = 14.sp)
+            }
+
+            Spacer(modifier = Modifier.height(8.dp))
+
             // Instructions
             Card(
                 modifier = Modifier.fillMaxWidth(),
@@ -249,4 +259,29 @@ fun MainMenuScreen(
             }
         }
     }
+
+    // About dialog
+    if (showAbout) {
+        AlertDialog(
+            onDismissRequest = { showAbout = false },
+            title = { Text("关于", color = GoldAccent, fontWeight = FontWeight.Bold) },
+            text = {
+                Column {
+                    Text("感谢名单", color = GoldAccent, fontSize = 16.sp, fontWeight = FontWeight.Bold)
+                    Spacer(modifier = Modifier.height(12.dp))
+                    Text("主创：刘博", color = Color.White, fontSize = 14.sp)
+                    Spacer(modifier = Modifier.height(4.dp))
+                    Text("最佳苦力：opencode、deepseek v4 pro", color = Color.White, fontSize = 14.sp)
+                    Spacer(modifier = Modifier.height(4.dp))
+                    Text("金牌测试：张天弈、蔺明智", color = Color.White, fontSize = 14.sp)
+                }
+            },
+            confirmButton = {
+                TextButton(onClick = { showAbout = false }) {
+                    Text("关闭", color = GoldAccent)
+                }
+            },
+            containerColor = DarkSurface
+        )
+    }
 }
diff --git a/app/src/main/java/com/unogame/ui/screens/ScoreboardScreen.kt b/app/src/main/java/com/unogame/ui/screens/ScoreboardScreen.kt
index 856382d..516d5ec 100644
--- a/app/src/main/java/com/unogame/ui/screens/ScoreboardScreen.kt
+++ b/app/src/main/java/com/unogame/ui/screens/ScoreboardScreen.kt
@@ -1,12 +1,18 @@
 package com.unogame.ui.screens
 
+import android.content.ClipData
+import android.content.ClipboardManager
+import android.content.Context
+import android.widget.Toast
 import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.*
 import androidx.compose.material3.*
@@ -19,6 +25,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import com.google.gson.Gson
 import com.unogame.game.GameMode
 import com.unogame.ui.theme.*
 import java.text.SimpleDateFormat
@@ -28,10 +35,16 @@ import java.util.*
 @Composable
 fun ScoreboardScreen(onBack: () -> Unit) {
     val context = LocalContext.current
-    val scores = remember { Scoreboard.loadScores(context) }
+    var scores by remember { mutableStateOf(Scoreboard.loadScores(context)) }
     var selectedFilter by remember { mutableStateOf("全部") }
     val modes = listOf("全部") + GameMode.values().map { it.displayName }
 
+    var showDetailDialog by remember { mutableStateOf(false) }
+    var detailEntry by remember { mutableStateOf<ScoreEntry?>(null) }
+    var showImportDialog by remember { mutableStateOf(false) }
+    var importJson by remember { mutableStateOf("") }
+    val gson = remember { Gson() }
+
     val filtered = if (selectedFilter == "全部") scores
     else scores.filter { it.mode == selectedFilter }
 
@@ -49,6 +62,38 @@ fun ScoreboardScreen(onBack: () -> Unit) {
 
             Spacer(modifier = Modifier.height(16.dp))
 
+            // Import / Export buttons
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.spacedBy(8.dp)
+            ) {
+                OutlinedButton(
+                    onClick = {
+                        val json = gson.toJson(scores)
+                        val clipboard = context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
+                        clipboard.setPrimaryClip(ClipData.newPlainText("uno_scoreboard", json))
+                        Toast.makeText(context, "已复制备份JSON到剪贴板", Toast.LENGTH_SHORT).show()
+                    },
+                    modifier = Modifier.weight(1f),
+                    colors = ButtonDefaults.outlinedButtonColors(contentColor = Color.White.copy(alpha = 0.7f))
+                ) {
+                    Icon(Icons.Default.FileUpload, null, modifier = Modifier.size(16.dp))
+                    Spacer(modifier = Modifier.width(4.dp))
+                    Text("导出备份", fontSize = 12.sp)
+                }
+                OutlinedButton(
+                    onClick = { showImportDialog = true },
+                    modifier = Modifier.weight(1f),
+                    colors = ButtonDefaults.outlinedButtonColors(contentColor = Color.White.copy(alpha = 0.7f))
+                ) {
+                    Icon(Icons.Default.FileDownload, null, modifier = Modifier.size(16.dp))
+                    Spacer(modifier = Modifier.width(4.dp))
+                    Text("导入备份", fontSize = 12.sp)
+                }
+            }
+
+            Spacer(modifier = Modifier.height(12.dp))
+
             // Mode filter chips
             if (scores.isNotEmpty()) {
                 Row(
@@ -106,7 +151,12 @@ fun ScoreboardScreen(onBack: () -> Unit) {
                             else "${entry.duration}秒"
 
                         Card(
-                            modifier = Modifier.fillMaxWidth(),
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .clickable {
+                                    detailEntry = entry
+                                    showDetailDialog = true
+                                },
                             shape = RoundedCornerShape(12.dp),
                             colors = CardDefaults.cardColors(containerColor = if (index < 3) DarkSurface else DarkCard)
                         ) {
@@ -179,4 +229,102 @@ fun ScoreboardScreen(onBack: () -> Unit) {
             }
         }
     }
+
+    // Detail dialog
+    if (showDetailDialog && detailEntry != null) {
+        val entry = detailEntry!!
+        val grouped = entry.scoreDetail.split(", ").filter { it.isNotEmpty() }
+            .groupBy { it }
+            .mapValues { it.value.size }
+        AlertDialog(
+            onDismissRequest = { showDetailDialog = false },
+            title = {
+                Text("${entry.name} — ${entry.mode}", color = GoldAccent, fontWeight = FontWeight.Bold, fontSize = 18.sp)
+            },
+            text = {
+                Column(
+                    modifier = Modifier.heightIn(max = 400.dp)
+                        .verticalScroll(rememberScrollState())
+                ) {
+                    Text("总分: ${entry.points}分", color = GoldAccent, fontSize = 16.sp, fontWeight = FontWeight.Black)
+                    Spacer(modifier = Modifier.height(4.dp))
+                    Text("难度: ${entry.difficulty} | ${entry.playerCount}人 | ${entry.turnNumber}轮",
+                        color = Color.White.copy(alpha = 0.5f), fontSize = 12.sp)
+                    Spacer(modifier = Modifier.height(12.dp))
+                    Text("分数明细", color = GoldAccent, fontSize = 14.sp, fontWeight = FontWeight.Bold)
+                    Spacer(modifier = Modifier.height(6.dp))
+                    if (grouped.isEmpty()) {
+                        Text("无明细数据", color = Color.White.copy(alpha = 0.4f), fontSize = 13.sp)
+                    }
+                    grouped.forEach { (cardLabel, count) ->
+                        val cardScore = cardLabel.substringAfter("(").substringBefore("分)").toIntOrNull() ?: 0
+                        val subtotal = cardScore * count
+                        Row(modifier = Modifier.padding(vertical = 2.dp)) {
+                            Text(
+                                "$cardLabel × $count = ${subtotal}分",
+                                color = Color.White.copy(alpha = 0.75f),
+                                fontSize = 13.sp
+                            )
+                        }
+                    }
+                }
+            },
+            confirmButton = {
+                TextButton(onClick = { showDetailDialog = false }) {
+                    Text("关闭", color = GoldAccent)
+                }
+            },
+            containerColor = DarkSurface
+        )
+    }
+
+    // Import dialog
+    if (showImportDialog) {
+        AlertDialog(
+            onDismissRequest = { showImportDialog = false },
+            title = { Text("导入备份", color = GoldAccent) },
+            text = {
+                Column {
+                    Text("粘贴之前导出的JSON数据：", color = Color.White.copy(alpha = 0.7f), fontSize = 14.sp)
+                    Spacer(modifier = Modifier.height(8.dp))
+                    OutlinedTextField(
+                        value = importJson,
+                        onValueChange = { importJson = it },
+                        modifier = Modifier.fillMaxWidth().heightIn(min = 100.dp),
+                        colors = OutlinedTextFieldDefaults.colors(
+                            focusedTextColor = Color.White,
+                            unfocusedTextColor = Color.White,
+                            focusedBorderColor = GoldAccent,
+                            unfocusedBorderColor = Color.Gray,
+                            cursorColor = GoldAccent
+                        )
+                    )
+                }
+            },
+            confirmButton = {
+                TextButton(onClick = {
+                    try {
+                        val imported = gson.fromJson(importJson, Array<ScoreEntry>::class.java)?.toList() ?: emptyList()
+                        if (imported.isNotEmpty()) {
+                            val merged = (scores + imported).distinctBy { "${it.name}_${it.mode}_${it.date}" }
+                                .sortedByDescending { it.points }.take(50)
+                            Scoreboard.saveScores(context, merged)
+                            scores = merged
+                            Toast.makeText(context, "成功导入 ${imported.size} 条记录", Toast.LENGTH_SHORT).show()
+                        }
+                        showImportDialog = false
+                        importJson = ""
+                    } catch (e: Exception) {
+                        Toast.makeText(context, "JSON格式错误: ${e.message}", Toast.LENGTH_LONG).show()
+                    }
+                }) { Text("导入", color = GoldAccent) }
+            },
+            dismissButton = {
+                TextButton(onClick = { showImportDialog = false; importJson = "" }) {
+                    Text("取消", color = Color.White.copy(alpha = 0.5f))
+                }
+            },
+            containerColor = DarkSurface
+        )
+    }
 }