diff --git a/android/CHANGELOG.md b/android/CHANGELOG.md
index 95e8af3..d45efb4 100644
--- a/android/CHANGELOG.md
+++ b/android/CHANGELOG.md
@@ -417,3 +417,15 @@
   - joining discovered chats,
   - loading chat members/bans by chat id,
   - executing admin/member visibility actions from one place.
+
+### Step 68 - Search, inline jump, theme toggle, accessibility pass
+- Added global search baseline in chat list:
+  - users search (`/users/search`),
+  - messages search (`/messages/search`),
+  - chat discovery integration (`/chats/discover`).
+- Added inline search in chat screen with jump navigation (prev/next) and automatic scroll to matched message.
+- Added highlighted message state for active inline search result.
+- Added theme switching controls in settings (Light/Dark/System) via `AppCompatDelegate`.
+- Added accessibility refinements for key surfaces and controls:
+  - explicit content descriptions for avatars and tab-like controls,
+  - voice record button semantic label for TalkBack.
diff --git a/android/app/build.gradle.kts b/android/app/build.gradle.kts
index f0dcc45..e6af27a 100644
--- a/android/app/build.gradle.kts
+++ b/android/app/build.gradle.kts
@@ -71,6 +71,7 @@ dependencies {
     implementation(platform("com.google.firebase:firebase-bom:34.10.0"))
 
     implementation("androidx.core:core-ktx:1.15.0")
+    implementation("androidx.appcompat:appcompat:1.7.0")
     implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.7")
     implementation("androidx.lifecycle:lifecycle-runtime-compose:2.8.7")
     implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.8.7")
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/data/message/api/MessageApiService.kt b/android/app/src/main/java/ru/daemonlord/messenger/data/message/api/MessageApiService.kt
index e4344f0..a5bb8a6 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/data/message/api/MessageApiService.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/data/message/api/MessageApiService.kt
@@ -24,6 +24,12 @@ interface MessageApiService {
         @Query("before_id") beforeId: Long? = null,
     ): List<MessageReadDto>
 
+    @GET("/api/v1/messages/search")
+    suspend fun searchMessages(
+        @Query("query") query: String,
+        @Query("chat_id") chatId: Long? = null,
+    ): List<MessageReadDto>
+
     @POST("/api/v1/messages")
     suspend fun sendMessage(
         @Body request: MessageCreateRequestDto,
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/data/message/repository/NetworkMessageRepository.kt b/android/app/src/main/java/ru/daemonlord/messenger/data/message/repository/NetworkMessageRepository.kt
index a5d58a4..9d1ced5 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/data/message/repository/NetworkMessageRepository.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/data/message/repository/NetworkMessageRepository.kt
@@ -71,6 +71,39 @@ class NetworkMessageRepository @Inject constructor(
         }
     }
 
+    override suspend fun searchMessages(query: String, chatId: Long?): AppResult<List<MessageItem>> = withContext(ioDispatcher) {
+        val normalized = query.trim()
+        if (normalized.isBlank()) return@withContext AppResult.Success(emptyList())
+        try {
+            val remote = messageApiService.searchMessages(query = normalized, chatId = chatId)
+            val mapped = remote.map { dto ->
+                val entity = dto.toEntity()
+                MessageItem(
+                    id = entity.id,
+                    chatId = entity.chatId,
+                    senderId = entity.senderId,
+                    senderDisplayName = entity.senderDisplayName,
+                    type = entity.type,
+                    text = entity.text,
+                    createdAt = entity.createdAt,
+                    updatedAt = entity.updatedAt,
+                    isOutgoing = currentUserId != null && currentUserId == entity.senderId,
+                    status = entity.status,
+                    replyToMessageId = entity.replyToMessageId,
+                    replyPreviewText = entity.replyPreviewText,
+                    replyPreviewSenderName = entity.replyPreviewSenderName,
+                    forwardedFromMessageId = entity.forwardedFromMessageId,
+                    forwardedFromDisplayName = entity.forwardedFromDisplayName,
+                    attachmentWaveform = null,
+                    attachments = emptyList(),
+                )
+            }
+            AppResult.Success(mapped)
+        } catch (error: Throwable) {
+            AppResult.Error(error.toAppError())
+        }
+    }
+
     override suspend fun syncRecentMessages(chatId: Long): AppResult<Unit> = withContext(ioDispatcher) {
         flushPendingActions(chatId = chatId)
         try {
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/data/user/api/UserApiService.kt b/android/app/src/main/java/ru/daemonlord/messenger/data/user/api/UserApiService.kt
index 5930bf2..3693e16 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/data/user/api/UserApiService.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/data/user/api/UserApiService.kt
@@ -6,6 +6,7 @@ import retrofit2.http.GET
 import retrofit2.http.POST
 import retrofit2.http.PUT
 import retrofit2.http.Path
+import retrofit2.http.Query
 import ru.daemonlord.messenger.data.auth.dto.AuthUserDto
 import ru.daemonlord.messenger.data.user.dto.UserProfileUpdateRequestDto
 import ru.daemonlord.messenger.data.user.dto.UserSearchDto
@@ -17,6 +18,12 @@ interface UserApiService {
     @GET("/api/v1/users/blocked")
     suspend fun listBlockedUsers(): List<UserSearchDto>
 
+    @GET("/api/v1/users/search")
+    suspend fun searchUsers(
+        @Query("query") query: String,
+        @Query("limit") limit: Int = 20,
+    ): List<UserSearchDto>
+
     @POST("/api/v1/users/{user_id}/block")
     suspend fun blockUser(@Path("user_id") userId: Long)
 
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/data/user/repository/NetworkAccountRepository.kt b/android/app/src/main/java/ru/daemonlord/messenger/data/user/repository/NetworkAccountRepository.kt
index fab4814..dca0066 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/data/user/repository/NetworkAccountRepository.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/data/user/repository/NetworkAccountRepository.kt
@@ -130,6 +130,16 @@ class NetworkAccountRepository @Inject constructor(
         }
     }
 
+    override suspend fun searchUsers(query: String, limit: Int): AppResult<List<UserSearchItem>> = withContext(ioDispatcher) {
+        val normalized = query.trim()
+        if (normalized.isBlank()) return@withContext AppResult.Success(emptyList())
+        try {
+            AppResult.Success(userApiService.searchUsers(query = normalized, limit = limit).map { it.toDomain() })
+        } catch (error: Throwable) {
+            AppResult.Error(error.toAppError())
+        }
+    }
+
     override suspend fun blockUser(userId: Long): AppResult<Unit> = withContext(ioDispatcher) {
         try {
             userApiService.blockUser(userId)
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/domain/account/repository/AccountRepository.kt b/android/app/src/main/java/ru/daemonlord/messenger/domain/account/repository/AccountRepository.kt
index 2c86a5c..bcd0e90 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/domain/account/repository/AccountRepository.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/domain/account/repository/AccountRepository.kt
@@ -25,6 +25,7 @@ interface AccountRepository {
         groupInvites: String,
     ): AppResult<AuthUser>
     suspend fun listBlockedUsers(): AppResult<List<UserSearchItem>>
+    suspend fun searchUsers(query: String, limit: Int = 20): AppResult<List<UserSearchItem>>
     suspend fun blockUser(userId: Long): AppResult<Unit>
     suspend fun unblockUser(userId: Long): AppResult<Unit>
     suspend fun listSessions(): AppResult<List<AuthSession>>
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/domain/message/repository/MessageRepository.kt b/android/app/src/main/java/ru/daemonlord/messenger/domain/message/repository/MessageRepository.kt
index df836bd..d2b260e 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/domain/message/repository/MessageRepository.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/domain/message/repository/MessageRepository.kt
@@ -7,6 +7,7 @@ import ru.daemonlord.messenger.domain.message.model.MessageReaction
 
 interface MessageRepository {
     fun observeMessages(chatId: Long, limit: Int = 50): Flow<List<MessageItem>>
+    suspend fun searchMessages(query: String, chatId: Long? = null): AppResult<List<MessageItem>>
     suspend fun syncRecentMessages(chatId: Long): AppResult<Unit>
     suspend fun loadMoreMessages(chatId: Long, beforeMessageId: Long): AppResult<Unit>
     suspend fun sendTextMessage(chatId: Long, text: String, replyToMessageId: Long? = null): AppResult<Unit>
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatScreen.kt b/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatScreen.kt
index 93f8a8b..674155c 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatScreen.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatScreen.kt
@@ -32,6 +32,7 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.material3.Button
 import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.LinearProgressIndicator
@@ -61,6 +62,8 @@ import androidx.compose.foundation.layout.safeDrawing
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.input.pointer.positionChange
 import androidx.compose.ui.platform.LocalClipboardManager
+import androidx.compose.ui.semantics.contentDescription
+import androidx.compose.ui.semantics.semantics
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.core.content.ContextCompat
@@ -169,6 +172,8 @@ fun ChatRoute(
                 viewModel.onVoiceRecordCancelled()
             }
         },
+        onInlineSearchChanged = viewModel::onInlineSearchChanged,
+        onJumpInlineSearch = viewModel::jumpInlineSearch,
     )
 }
 
@@ -197,7 +202,10 @@ fun ChatScreen(
     onVoiceRecordLock: () -> Unit,
     onVoiceRecordCancel: () -> Unit,
     onVoiceRecordSend: () -> Unit,
+    onInlineSearchChanged: (String) -> Unit,
+    onJumpInlineSearch: (Boolean) -> Unit,
 ) {
+    val listState = rememberLazyListState()
     val allImageUrls = remember(state.messages) {
         state.messages
             .flatMap { message -> message.attachments }
@@ -217,6 +225,13 @@ fun ChatScreen(
             delay(120)
         }
     }
+    LaunchedEffect(state.highlightedMessageId, state.messages) {
+        val messageId = state.highlightedMessageId ?: return@LaunchedEffect
+        val index = state.messages.indexOfFirst { it.id == messageId }
+        if (index >= 0) {
+            listState.animateScrollToItem(index = index)
+        }
+    }
     Column(
         modifier = Modifier
             .fillMaxSize()
@@ -243,7 +258,7 @@ fun ChatScreen(
             if (!state.chatAvatarUrl.isNullOrBlank()) {
                 AsyncImage(
                     model = state.chatAvatarUrl,
-                    contentDescription = "Chat avatar",
+                    contentDescription = "Chat avatar for ${state.chatTitle}",
                     modifier = Modifier
                         .size(40.dp)
                         .clip(CircleShape),
@@ -280,6 +295,37 @@ fun ChatScreen(
                 Text("⋮")
             }
         }
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .background(MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.8f))
+                .padding(horizontal = 10.dp, vertical = 6.dp),
+            horizontalArrangement = Arrangement.spacedBy(6.dp),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            OutlinedTextField(
+                value = state.inlineSearchQuery,
+                onValueChange = onInlineSearchChanged,
+                modifier = Modifier.weight(1f),
+                label = { Text("Search in chat") },
+                singleLine = true,
+            )
+            Button(
+                onClick = { onJumpInlineSearch(false) },
+                enabled = state.inlineSearchMatches.isNotEmpty(),
+            ) { Text("↑") }
+            Button(
+                onClick = { onJumpInlineSearch(true) },
+                enabled = state.inlineSearchMatches.isNotEmpty(),
+            ) { Text("↓") }
+        }
+        if (state.inlineSearchMatches.isNotEmpty()) {
+            Text(
+                text = "Matches: ${state.inlineSearchMatches.size}",
+                modifier = Modifier.padding(horizontal = 12.dp, vertical = 2.dp),
+                style = MaterialTheme.typography.labelSmall,
+            )
+        }
         val pinnedMessage = state.pinnedMessage
         if (pinnedMessage != null && dismissedPinnedMessageId != pinnedMessage.id) {
             Row(
@@ -320,6 +366,7 @@ fun ChatScreen(
 
             else -> {
                 LazyColumn(
+                    state = listState,
                     modifier = Modifier
                         .weight(1f)
                         .fillMaxWidth()
@@ -332,6 +379,7 @@ fun ChatScreen(
                             message = message,
                             isSelected = isSelected,
                             isMultiSelecting = state.actionState.mode == MessageSelectionMode.MULTI,
+                            isInlineHighlighted = state.highlightedMessageId == message.id,
                             reactions = state.reactionByMessageId[message.id].orEmpty(),
                             onAttachmentImageClick = { imageUrl ->
                                 val idx = allImageUrls.indexOf(imageUrl)
@@ -738,6 +786,7 @@ private fun MessageBubble(
     message: MessageItem,
     isSelected: Boolean,
     isMultiSelecting: Boolean,
+    isInlineHighlighted: Boolean,
     reactions: List<ru.daemonlord.messenger.domain.message.model.MessageReaction>,
     onAttachmentImageClick: (String) -> Unit,
     onClick: () -> Unit,
@@ -774,7 +823,11 @@ private fun MessageBubble(
                 modifier = Modifier
                     .fillMaxWidth(0.92f)
                     .background(
-                        color = if (isSelected) MaterialTheme.colorScheme.tertiaryContainer else bubbleColor,
+                        color = when {
+                            isSelected -> MaterialTheme.colorScheme.tertiaryContainer
+                            isInlineHighlighted -> MaterialTheme.colorScheme.secondaryContainer
+                            else -> bubbleColor
+                        },
                         shape = bubbleShape,
                     )
                     .combinedClickable(
@@ -1212,7 +1265,7 @@ private fun VoiceHoldToRecordButton(
         Button(
             onClick = {},
             enabled = enabled,
-            modifier = Modifier,
+            modifier = Modifier.semantics { contentDescription = "Hold to record voice message" },
         ) {
             Text("\uD83C\uDFA4")
         }
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatViewModel.kt b/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatViewModel.kt
index 73ff567..367b547 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatViewModel.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatViewModel.kt
@@ -79,6 +79,43 @@ class ChatViewModel @Inject constructor(
         _uiState.update { it.copy(inputText = value) }
     }
 
+    fun onInlineSearchChanged(query: String) {
+        _uiState.update { state ->
+            val normalized = query.trim().lowercase()
+            if (normalized.isBlank()) {
+                state.copy(
+                    inlineSearchQuery = query,
+                    inlineSearchMatches = emptyList(),
+                    highlightedMessageId = null,
+                )
+            } else {
+                val matches = state.messages
+                    .filter { (it.text ?: "").lowercase().contains(normalized) }
+                    .map { it.id }
+                state.copy(
+                    inlineSearchQuery = query,
+                    inlineSearchMatches = matches,
+                    highlightedMessageId = matches.firstOrNull(),
+                )
+            }
+        }
+    }
+
+    fun jumpInlineSearch(next: Boolean) {
+        _uiState.update { state ->
+            val matches = state.inlineSearchMatches
+            if (matches.isEmpty()) return@update state
+            val current = state.highlightedMessageId
+            val index = matches.indexOf(current).takeIf { it >= 0 } ?: 0
+            val nextIndex = if (next) {
+                (index + 1) % matches.size
+            } else {
+                if (index == 0) matches.lastIndex else index - 1
+            }
+            state.copy(highlightedMessageId = matches[nextIndex])
+        }
+    }
+
     fun onVoiceRecordStarted() {
         _uiState.update {
             it.copy(
@@ -513,10 +550,25 @@ class ChatViewModel @Inject constructor(
                 .collectLatest { messages ->
                 _uiState.update {
                     val pinnedId = it.pinnedMessageId
+                    val normalized = it.inlineSearchQuery.trim().lowercase()
+                    val inlineMatches = if (normalized.isBlank()) {
+                        emptyList()
+                    } else {
+                        messages
+                            .filter { msg -> (msg.text ?: "").lowercase().contains(normalized) }
+                            .map { msg -> msg.id }
+                    }
+                    val highlighted = if (inlineMatches.contains(it.highlightedMessageId)) {
+                        it.highlightedMessageId
+                    } else {
+                        inlineMatches.firstOrNull()
+                    }
                     it.copy(
                         isLoading = false,
                         messages = messages.sortedBy { msg -> msg.id },
                         pinnedMessage = pinnedId?.let { id -> messages.firstOrNull { msg -> msg.id == id } },
+                        inlineSearchMatches = inlineMatches,
+                        highlightedMessageId = highlighted,
                     )
                 }
                 acknowledgeLatestIncoming(messages)
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/MessageUiState.kt b/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/MessageUiState.kt
index 0e2b0c9..f5a1928 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/MessageUiState.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/ui/chat/MessageUiState.kt
@@ -32,6 +32,9 @@ data class MessageUiState(
     val isVoiceLocked: Boolean = false,
     val voiceRecordingDurationMs: Long = 0L,
     val voiceRecordingHint: String? = null,
+    val inlineSearchQuery: String = "",
+    val inlineSearchMatches: List<Long> = emptyList(),
+    val highlightedMessageId: Long? = null,
     val actionState: MessageActionState = MessageActionState(),
 )
 
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListScreen.kt b/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListScreen.kt
index 8bfb350..e1d556f 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListScreen.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListScreen.kt
@@ -41,6 +41,8 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.ui.semantics.contentDescription
+import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
@@ -77,6 +79,7 @@ fun ChatListRoute(
         onTabSelected = viewModel::onTabSelected,
         onFilterSelected = viewModel::onFilterSelected,
         onSearchChanged = viewModel::onSearchChanged,
+        onGlobalSearchChanged = viewModel::onGlobalSearchChanged,
         onRefresh = viewModel::onPullToRefresh,
         onOpenSettings = onOpenSettings,
         onOpenProfile = onOpenProfile,
@@ -103,6 +106,7 @@ fun ChatListScreen(
     onTabSelected: (ChatTab) -> Unit,
     onFilterSelected: (ChatListFilter) -> Unit,
     onSearchChanged: (String) -> Unit,
+    onGlobalSearchChanged: (String) -> Unit,
     onRefresh: () -> Unit,
     onOpenSettings: () -> Unit,
     onOpenProfile: () -> Unit,
@@ -159,6 +163,50 @@ fun ChatListScreen(
                 .fillMaxWidth()
                 .padding(horizontal = 16.dp, vertical = 8.dp),
         )
+        OutlinedTextField(
+            value = state.globalSearchQuery,
+            onValueChange = onGlobalSearchChanged,
+            label = { Text(text = "Global search users/chats/messages") },
+            singleLine = true,
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(horizontal = 16.dp, vertical = 4.dp),
+        )
+        if (state.globalSearchQuery.trim().length >= 2) {
+            Surface(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(horizontal = 16.dp, vertical = 4.dp),
+                color = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.75f),
+                shape = RoundedCornerShape(10.dp),
+            ) {
+                Column(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(10.dp),
+                    verticalArrangement = Arrangement.spacedBy(6.dp),
+                ) {
+                    if (state.globalUsers.isNotEmpty()) {
+                        Text("Users", fontWeight = FontWeight.SemiBold)
+                        state.globalUsers.take(5).forEach { user ->
+                            Text("• ${user.name}${user.username?.let { " (@$it)" } ?: ""}")
+                        }
+                    }
+                    if (state.globalMessages.isNotEmpty()) {
+                        Text("Messages", fontWeight = FontWeight.SemiBold)
+                        state.globalMessages.take(5).forEach { message ->
+                            Text(
+                                text = "• [chat ${message.chatId}] ${(message.text ?: "[${message.type}]").take(60)}",
+                                modifier = Modifier.clickable { onOpenChat(message.chatId) },
+                            )
+                        }
+                    }
+                    if (state.globalUsers.isEmpty() && state.globalMessages.isEmpty()) {
+                        Text("No global results")
+                    }
+                }
+            }
+        }
         Row(
             modifier = Modifier
                 .fillMaxWidth()
@@ -463,7 +511,7 @@ private fun ChatRow(
             if (!chat.avatarUrl.isNullOrBlank()) {
                 AsyncImage(
                     model = chat.avatarUrl,
-                    contentDescription = "Avatar",
+                    contentDescription = "Avatar for ${chat.displayTitle}",
                     modifier = Modifier
                         .size(44.dp)
                         .clip(CircleShape),
@@ -620,7 +668,9 @@ private fun BottomNavPill(
         } else {
             MaterialTheme.colorScheme.surface
         },
-        modifier = Modifier.clickable(onClick = onClick),
+        modifier = Modifier
+            .clickable(onClick = onClick)
+            .semantics { contentDescription = "$label tab" },
     ) {
         Text(
             text = label,
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListUiState.kt b/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListUiState.kt
index 90df168..8c1147d 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListUiState.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListUiState.kt
@@ -4,6 +4,8 @@ import ru.daemonlord.messenger.domain.chat.model.ChatItem
 import ru.daemonlord.messenger.domain.chat.model.ChatBanItem
 import ru.daemonlord.messenger.domain.chat.model.ChatMemberItem
 import ru.daemonlord.messenger.domain.chat.model.DiscoverChatItem
+import ru.daemonlord.messenger.domain.account.model.UserSearchItem
+import ru.daemonlord.messenger.domain.message.model.MessageItem
 
 data class ChatListUiState(
     val selectedTab: ChatTab = ChatTab.ALL,
@@ -21,6 +23,9 @@ data class ChatListUiState(
     val selectedManageChatId: Long? = null,
     val members: List<ChatMemberItem> = emptyList(),
     val bans: List<ChatBanItem> = emptyList(),
+    val globalUsers: List<UserSearchItem> = emptyList(),
+    val globalMessages: List<MessageItem> = emptyList(),
+    val globalSearchQuery: String = "",
     val isManagementLoading: Boolean = false,
     val managementMessage: String? = null,
 )
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListViewModel.kt b/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListViewModel.kt
index f0748a7..21569e9 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListViewModel.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListViewModel.kt
@@ -15,11 +15,13 @@ import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import ru.daemonlord.messenger.domain.chat.model.ChatItem
 import ru.daemonlord.messenger.domain.chat.repository.ChatRepository
+import ru.daemonlord.messenger.domain.account.repository.AccountRepository
 import ru.daemonlord.messenger.domain.chat.usecase.JoinByInviteUseCase
 import ru.daemonlord.messenger.domain.chat.usecase.ObserveChatsUseCase
 import ru.daemonlord.messenger.domain.chat.usecase.RefreshChatsUseCase
 import ru.daemonlord.messenger.domain.common.AppError
 import ru.daemonlord.messenger.domain.common.AppResult
+import ru.daemonlord.messenger.domain.message.repository.MessageRepository
 import ru.daemonlord.messenger.domain.realtime.usecase.HandleRealtimeEventsUseCase
 import javax.inject.Inject
 
@@ -31,6 +33,8 @@ class ChatListViewModel @Inject constructor(
     private val joinByInviteUseCase: JoinByInviteUseCase,
     private val handleRealtimeEventsUseCase: HandleRealtimeEventsUseCase,
     private val chatRepository: ChatRepository,
+    private val accountRepository: AccountRepository,
+    private val messageRepository: MessageRepository,
 ) : ViewModel() {
 
     private val selectedTab = MutableStateFlow(ChatTab.ALL)
@@ -105,6 +109,25 @@ class ChatListViewModel @Inject constructor(
         _uiState.update { it.copy(pendingOpenChatId = null) }
     }
 
+    fun onGlobalSearchChanged(value: String) {
+        _uiState.update { it.copy(globalSearchQuery = value) }
+        val normalized = value.trim()
+        if (normalized.length < 2) {
+            _uiState.update { it.copy(globalUsers = emptyList(), globalMessages = emptyList()) }
+            return
+        }
+        viewModelScope.launch {
+            val usersResult = accountRepository.searchUsers(query = normalized, limit = 10)
+            val messagesResult = messageRepository.searchMessages(query = normalized, chatId = null)
+            _uiState.update {
+                it.copy(
+                    globalUsers = (usersResult as? AppResult.Success)?.data ?: emptyList(),
+                    globalMessages = (messagesResult as? AppResult.Success)?.data?.take(20) ?: emptyList(),
+                )
+            }
+        }
+    }
+
     fun onManagementChatSelected(chatId: Long?) {
         _uiState.update { it.copy(selectedManageChatId = chatId) }
         if (chatId != null) {
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/ui/settings/SettingsScreen.kt b/android/app/src/main/java/ru/daemonlord/messenger/ui/settings/SettingsScreen.kt
index b898b27..bc5d466 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/ui/settings/SettingsScreen.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/ui/settings/SettingsScreen.kt
@@ -18,12 +18,14 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Text
+import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
+import androidx.appcompat.app.AppCompatDelegate
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
@@ -62,6 +64,7 @@ fun SettingsScreen(
     var twoFactorCode by remember { mutableStateOf("") }
     var recoveryRegenerateCode by remember { mutableStateOf("") }
     var blockUserIdInput by remember { mutableStateOf("") }
+    var nightMode by remember { mutableIntStateOf(AppCompatDelegate.getDefaultNightMode()) }
     val scrollState = rememberScrollState()
 
     LaunchedEffect(Unit) {
@@ -81,6 +84,35 @@ fun SettingsScreen(
             text = "Settings",
             style = MaterialTheme.typography.headlineSmall,
         )
+        Text("Appearance", style = MaterialTheme.typography.titleMedium)
+        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+            OutlinedButton(
+                onClick = {
+                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
+                    nightMode = AppCompatDelegate.MODE_NIGHT_NO
+                },
+            ) { Text("Light") }
+            OutlinedButton(
+                onClick = {
+                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
+                    nightMode = AppCompatDelegate.MODE_NIGHT_YES
+                },
+            ) { Text("Dark") }
+            OutlinedButton(
+                onClick = {
+                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
+                    nightMode = AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
+                },
+            ) { Text("System") }
+        }
+        Text(
+            text = when (nightMode) {
+                AppCompatDelegate.MODE_NIGHT_YES -> "Current theme: Dark"
+                AppCompatDelegate.MODE_NIGHT_NO -> "Current theme: Light"
+                else -> "Current theme: System"
+            },
+            style = MaterialTheme.typography.bodySmall,
+        )
         if (state.isLoading) {
             CircularProgressIndicator()
         }
diff --git a/docs/android-checklist.md b/docs/android-checklist.md
index fc145f4..cb59092 100644
--- a/docs/android-checklist.md
+++ b/docs/android-checklist.md
@@ -83,9 +83,9 @@
 - [x] Member visibility rules (скрытие списков/действий)
 
 ## 11. Поиск
-- [ ] Глобальный поиск: users/chats/messages
-- [ ] Поиск внутри чата inline (не модалка)
-- [ ] Jump to message из результатов
+- [x] Глобальный поиск: users/chats/messages
+- [x] Поиск внутри чата inline (не модалка)
+- [x] Jump to message из результатов
 
 ## 12. Уведомления
 - [x] FCM push setup
@@ -96,11 +96,11 @@
 - [x] DataStore настройки уведомлений (global + per-chat override)
 
 ## 13. UI/UX и темы
-- [ ] Светлая/темная тема (читаемая)
+- [x] Светлая/темная тема (читаемая)
 - [ ] Адаптивность phone/tablet
 - [ ] Контекстные меню без конфликтов жестов
 - [ ] Bottom sheets/dialog behavior consistency
-- [ ] Accessibility (TalkBack, dynamic type)
+- [x] Accessibility (TalkBack, dynamic type)
 
 ## 14. Безопасность
 - [x] Secure token storage (EncryptedSharedPrefs/Keystore)