diff --git a/README.md b/README.md
index 2964801..c1bba64 100644
--- a/README.md
+++ b/README.md
@@ -43,12 +43,14 @@
 - `/seen` `(/info)`
 - `/tpsbar`
 - `/essc admin` 管理模式切换
+- `/maintenance` `(/maint)` 维护模式管理
 
 ### 其它功能
 
 - Shift + 右键快捷打开潜影盒
 - 潜影盒交互保护，尽量避免刷物品、吞物品和嵌套放入问题
 - 管理模式独立背包、装备栏与状态切换
+- 维护模式：替换 MOTD，并阻止无绕过权限的玩家进入
 - Enderman 掉落方块控制
 - JEI 配方同步修复
 
@@ -64,6 +66,7 @@
 | `tpsbar` | 开启 | 插件版 TPSBar，仍受 `config.yml` 中 `tpsbar.mode` 控制 |
 | `jei-sync` | 开启 | Fabric / NeoForge JEI 配方同步修复 |
 | `mob-drops` | 关闭 | 末影人掉落控制，默认关闭以保留过去标准版行为 |
+| `maintenance` | 开启 | 维护模式命令、MOTD 替换和登录拦截 |
 
 修改模块开关后建议重启服务器，使命令注册表和监听器状态完全刷新。`/essc reload` 可以刷新配置和已注册命令的执行检查，但无法从 Bukkit 命令表中真正热移除或新增直连命令。
 
@@ -88,6 +91,12 @@
   - 便捷菜单布局
 - `modules.yml`
   - 功能模块开关
+- `maintenance.yml`
+  - 维护模式状态
+  - 维护 MOTD
+  - 维护踢出提示
+  - 维护 BossBar
+  - 绕过权限
 - `lang/zh_CN.yml`、`lang/en_US.yml`
   - 命令反馈
   - 帮助信息
@@ -143,8 +152,21 @@ Windows 可使用：
 ```bash
 ./gradlew shadowJar
 ./gradlew build
+./gradlew deployToPaper12111
+./gradlew deployToPaper2612
 ```
 
+## 本地测试服
+
+项目包含两个本地测试服目录：
+
+| 测试服 | 端口 | 部署任务 | 启动脚本 |
+| --- | --- | --- | --- |
+| Paper 1.21.11 | `25566` | `deployToPaper12111` | `test-server/paper-1.21.11/start.bat` |
+| Paper 26.1.2 | `25565` | `deployToPaper2612` | `test-server/paper-26.1.2/start.bat` |
+
+IDEA 运行配置会在启动测试服前自动执行对应部署任务。部署任务会替换 `EssentialsC*.jar`，并删除 `plugins/EssentialsC` 数据目录，以便测试新增默认配置和语言文本。
+
 ## 开发说明
 
 - 使用 `paperweight-userdev` 进行 Paper 开发
diff --git a/build.gradle b/build.gradle
index 4adf0a8..9849ee9 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ plugins {
 }
 
 group = 'cn.infstar'
-version = '1.3.1'
+version = '1.4.0'
 
 repositories {
     mavenCentral()
@@ -55,3 +55,25 @@ tasks.named('shadowJar', ShadowJar).configure {
 tasks.named('assemble').configure {
     dependsOn(tasks.named('shadowJar'))
 }
+
+def registerTestServerDeployTask = { String taskName, String serverPath, String serverName ->
+    tasks.register(taskName, Copy) {
+        group = 'deployment'
+        description = "构建并部署插件到本地 ${serverName} 测试服务器。"
+        def artifact = tasks.named('shadowJar').flatMap { it.archiveFile }
+        def pluginsDir = layout.projectDirectory.dir("${serverPath}/plugins")
+        dependsOn(tasks.named('shadowJar'))
+        from(artifact)
+        into(pluginsDir)
+
+        doFirst {
+            delete(fileTree(pluginsDir) {
+                include 'EssentialsC*.jar'
+            })
+            delete(pluginsDir.file('EssentialsC').asFile)
+        }
+    }
+}
+
+registerTestServerDeployTask('deployToPaper12111', 'test-server/paper-1.21.11', 'Paper 1.21.11')
+registerTestServerDeployTask('deployToPaper2612', 'test-server/paper-26.1.2', 'Paper 26.1.2')
diff --git a/src/main/java/cn/infstar/essentialsC/EssentialsC.java b/src/main/java/cn/infstar/essentialsC/EssentialsC.java
index 436f103..2f5ec77 100644
--- a/src/main/java/cn/infstar/essentialsC/EssentialsC.java
+++ b/src/main/java/cn/infstar/essentialsC/EssentialsC.java
@@ -4,6 +4,8 @@ import cn.infstar.essentialsC.admin.AdminModeManager;
 import cn.infstar.essentialsC.commands.BaseCommand;
 import cn.infstar.essentialsC.commands.CommandRegistry;
 import cn.infstar.essentialsC.commands.HelpCommand;
+import cn.infstar.essentialsC.maintenance.MaintenanceListener;
+import cn.infstar.essentialsC.maintenance.MaintenanceManager;
 import cn.infstar.essentialsC.tpsbar.TpsBarService;
 import org.bukkit.Bukkit;
 import org.bukkit.command.Command;
@@ -18,6 +20,7 @@ public final class EssentialsC extends JavaPlugin {
     private static LangManager langManager;
     private ModuleManager moduleManager;
     private AdminModeManager adminModeManager;
+    private MaintenanceManager maintenanceManager;
     private TpsBarService tpsBarManager;
 
     @Override
@@ -30,6 +33,11 @@ public final class EssentialsC extends JavaPlugin {
             getServer().getPluginManager().registerEvents(adminModeManager, this);
         }
 
+        if (moduleManager.isEnabled(ModuleManager.MAINTENANCE)) {
+            maintenanceManager = new MaintenanceManager(this);
+            getServer().getPluginManager().registerEvents(new MaintenanceListener(this), this);
+        }
+
         if (moduleManager.isEnabled(ModuleManager.TPSBAR)) {
             tpsBarManager = createOptionalService("cn.infstar.essentialsC.tpsbar.TpsBarManager", TpsBarService.class);
         }
@@ -51,6 +59,9 @@ public final class EssentialsC extends JavaPlugin {
         if (adminModeManager != null) {
             adminModeManager.shutdown();
         }
+        if (maintenanceManager != null) {
+            maintenanceManager.shutdown();
+        }
         getLogger().info("EssentialsC 已禁用。");
     }
 
@@ -66,6 +77,10 @@ public final class EssentialsC extends JavaPlugin {
         return moduleManager;
     }
 
+    public MaintenanceManager getMaintenanceManager() {
+        return maintenanceManager;
+    }
+
     public TpsBarService getTpsBarManager() {
         return tpsBarManager;
     }
@@ -151,6 +166,7 @@ public final class EssentialsC extends JavaPlugin {
     }
 
     private void registerCommandWithAliases(org.bukkit.command.CommandMap commandMap, String name, BaseCommand executor, String... aliases) {
+        String fallbackPrefix = getName().toLowerCase(java.util.Locale.ROOT);
         Command command = new Command(name) {
             @Override
             public boolean execute(CommandSender sender, String commandLabel, String[] args) {
@@ -171,7 +187,7 @@ public final class EssentialsC extends JavaPlugin {
         };
 
         command.setPermission(executor.getPermission());
-        commandMap.register("", command);
+        commandMap.register(fallbackPrefix, command);
 
         for (String alias : aliases) {
             Command aliasCmd = new Command(alias) {
@@ -193,7 +209,7 @@ public final class EssentialsC extends JavaPlugin {
                 }
             };
             aliasCmd.setPermission(executor.getPermission());
-            commandMap.register("", aliasCmd);
+            commandMap.register(fallbackPrefix, aliasCmd);
         }
     }
 }
diff --git a/src/main/java/cn/infstar/essentialsC/ModuleManager.java b/src/main/java/cn/infstar/essentialsC/ModuleManager.java
index 708b6d9..2a75911 100644
--- a/src/main/java/cn/infstar/essentialsC/ModuleManager.java
+++ b/src/main/java/cn/infstar/essentialsC/ModuleManager.java
@@ -19,6 +19,7 @@ public final class ModuleManager {
     public static final String TPSBAR = "tpsbar";
     public static final String JEI_SYNC = "jei-sync";
     public static final String MOB_DROPS = "mob-drops";
+    public static final String MAINTENANCE = "maintenance";
 
     private static final Map<String, Boolean> DEFAULT_MODULES = new LinkedHashMap<>();
 
@@ -29,6 +30,7 @@ public final class ModuleManager {
         DEFAULT_MODULES.put(TPSBAR, true);
         DEFAULT_MODULES.put(JEI_SYNC, true);
         DEFAULT_MODULES.put(MOB_DROPS, false);
+        DEFAULT_MODULES.put(MAINTENANCE, true);
     }
 
     private final JavaPlugin plugin;
diff --git a/src/main/java/cn/infstar/essentialsC/commands/CommandRegistry.java b/src/main/java/cn/infstar/essentialsC/commands/CommandRegistry.java
index c74b423..64d9e2c 100644
--- a/src/main/java/cn/infstar/essentialsC/commands/CommandRegistry.java
+++ b/src/main/java/cn/infstar/essentialsC/commands/CommandRegistry.java
@@ -42,6 +42,7 @@ public final class CommandRegistry {
         register("repair", "essentialsc.command.repair", ModuleManager.PLAYER, "cn.infstar.essentialsC.commands.RepairCommand", "rep");
         register("tpsbar", "essentialsc.command.tpsbar", ModuleManager.TPSBAR, "cn.infstar.essentialsC.commands.TpsBarCommand");
         register("mobdrops", "essentialsc.mobdrops.enderman", ModuleManager.MOB_DROPS, "cn.infstar.essentialsC.commands.MobDropCommand");
+        register("maintenance", "essentialsc.command.maintenance", ModuleManager.MAINTENANCE, "cn.infstar.essentialsC.commands.MaintenanceCommand", "maint");
         registerSubCommand("admin", "essentialsc.command.admin", ModuleManager.ADMIN_MODE, "cn.infstar.essentialsC.commands.AdminCommand");
     }
 
diff --git a/src/main/java/cn/infstar/essentialsC/commands/HelpCommand.java b/src/main/java/cn/infstar/essentialsC/commands/HelpCommand.java
index f64fd49..507d8a6 100644
--- a/src/main/java/cn/infstar/essentialsC/commands/HelpCommand.java
+++ b/src/main/java/cn/infstar/essentialsC/commands/HelpCommand.java
@@ -37,6 +37,9 @@ public class HelpCommand extends BaseCommand implements TabCompleter {
             EssentialsC.getLangManager().reload();
             plugin.getModuleManager().reload();
             CommandRegistry.clearCache();
+            if (plugin.getMaintenanceManager() != null && plugin.getModuleManager().isEnabled(ModuleManager.MAINTENANCE)) {
+                plugin.getMaintenanceManager().reload();
+            }
             TpsBarService tpsBarService = plugin.getTpsBarManager();
             if (tpsBarService != null) {
                 if (plugin.getModuleManager().isEnabled(ModuleManager.TPSBAR)) {
@@ -65,6 +68,9 @@ public class HelpCommand extends BaseCommand implements TabCompleter {
                 EssentialsC.getLangManager().reload();
                 plugin.getModuleManager().reload();
                 CommandRegistry.clearCache();
+                if (plugin.getMaintenanceManager() != null && plugin.getModuleManager().isEnabled(ModuleManager.MAINTENANCE)) {
+                    plugin.getMaintenanceManager().reload();
+                }
                 TpsBarService tpsBarService = plugin.getTpsBarManager();
                 if (tpsBarService != null) {
                     if (plugin.getModuleManager().isEnabled(ModuleManager.TPSBAR)) {
@@ -201,6 +207,10 @@ public class HelpCommand extends BaseCommand implements TabCompleter {
             otherCommands.append(lang.getString("help.commands.tpsbar")).append("\n");
             hasOtherCommands = true;
         }
+        if (CommandRegistry.isAvailable("maintenance") && player.hasPermission("essentialsc.command.maintenance")) {
+            otherCommands.append(lang.getString("help.commands.maintenance")).append("\n");
+            hasOtherCommands = true;
+        }
 
         if (hasOtherCommands) {
             sendPrefixed(player, lang.getString("help.section-other"));
@@ -272,6 +282,8 @@ public class HelpCommand extends BaseCommand implements TabCompleter {
                 {"repair", "essentialsc.command.repair"},
                 {"rep", "essentialsc.command.repair"},
                 {"tpsbar", "essentialsc.command.tpsbar"},
+                {"maintenance", "essentialsc.command.maintenance"},
+                {"maint", "essentialsc.command.maintenance"},
                 {"mobdrops", "essentialsc.mobdrops.enderman"},
                 {"admin", "essentialsc.command.admin"},
                 {"version", null},
@@ -324,6 +336,11 @@ public class HelpCommand extends BaseCommand implements TabCompleter {
                 }
                 return players;
             }
+
+            if ((subCmd.equals("maintenance") || subCmd.equals("maint"))
+                && sender.hasPermission("essentialsc.command.maintenance")) {
+                return completeMaintenanceArgs(args[1]);
+            }
         }
 
         return new ArrayList<>();
@@ -339,4 +356,15 @@ public class HelpCommand extends BaseCommand implements TabCompleter {
         }
         return completions;
     }
+
+    private List<String> completeMaintenanceArgs(String partialInput) {
+        List<String> completions = new ArrayList<>();
+        String partial = partialInput.toLowerCase();
+        for (String option : List.of("on", "off", "status", "reload")) {
+            if (option.startsWith(partial)) {
+                completions.add(option);
+            }
+        }
+        return completions;
+    }
 }
diff --git a/src/main/java/cn/infstar/essentialsC/commands/MaintenanceCommand.java b/src/main/java/cn/infstar/essentialsC/commands/MaintenanceCommand.java
new file mode 100644
index 0000000..0bf633f
--- /dev/null
+++ b/src/main/java/cn/infstar/essentialsC/commands/MaintenanceCommand.java
@@ -0,0 +1,86 @@
+package cn.infstar.essentialsC.commands;
+
+import cn.infstar.essentialsC.maintenance.MaintenanceManager;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabCompleter;
+import org.bukkit.entity.Player;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class MaintenanceCommand extends BaseCommand implements TabCompleter {
+
+    public MaintenanceCommand() {
+        super("essentialsc.command.maintenance");
+    }
+
+    @Override
+    protected boolean execute(Player player, String[] args) {
+        return executeCommand(player, args);
+    }
+
+    @Override
+    protected boolean executeConsole(CommandSender sender, String[] args) {
+        return executeCommand(sender, args);
+    }
+
+    private boolean executeCommand(CommandSender sender, String[] args) {
+        MaintenanceManager maintenanceManager = plugin.getMaintenanceManager();
+        if (maintenanceManager == null) {
+            sender.sendMessage(getLang().getPrefixedString("messages.module-disabled"));
+            return true;
+        }
+
+        if (args.length == 0 || args[0].equalsIgnoreCase("status")) {
+            sendStatus(sender, maintenanceManager);
+            return true;
+        }
+
+        switch (args[0].toLowerCase()) {
+            case "on", "enable", "enabled" -> {
+                maintenanceManager.setEnabled(true);
+                sender.sendMessage(getLang().getPrefixedString("maintenance.messages.enabled"));
+                return true;
+            }
+            case "off", "disable", "disabled" -> {
+                maintenanceManager.setEnabled(false);
+                sender.sendMessage(getLang().getPrefixedString("maintenance.messages.disabled"));
+                return true;
+            }
+            case "reload" -> {
+                maintenanceManager.reload();
+                sender.sendMessage(getLang().getPrefixedString("maintenance.messages.reloaded"));
+                return true;
+            }
+            default -> {
+                sender.sendMessage(getLang().getPrefixedString("maintenance.messages.usage"));
+                return true;
+            }
+        }
+    }
+
+    private void sendStatus(CommandSender sender, MaintenanceManager maintenanceManager) {
+        String status = getLang().getString(maintenanceManager.isEnabled()
+            ? "maintenance.status.enabled"
+            : "maintenance.status.disabled");
+        sender.sendMessage(getLang().getPrefixedString("maintenance.messages.status",
+            java.util.Map.of("status", status)));
+    }
+
+    @Override
+    public List<String> onTabComplete(CommandSender sender, Command command, String label, String[] args) {
+        if (args.length != 1 || !sender.hasPermission(getPermission())) {
+            return List.of();
+        }
+
+        String partial = args[0].toLowerCase();
+        List<String> completions = new ArrayList<>();
+        for (String option : List.of("on", "off", "status", "reload")) {
+            if (option.startsWith(partial)) {
+                completions.add(option);
+            }
+        }
+        return completions;
+    }
+}
diff --git a/src/main/java/cn/infstar/essentialsC/maintenance/MaintenanceListener.java b/src/main/java/cn/infstar/essentialsC/maintenance/MaintenanceListener.java
new file mode 100644
index 0000000..ef6b716
--- /dev/null
+++ b/src/main/java/cn/infstar/essentialsC/maintenance/MaintenanceListener.java
@@ -0,0 +1,66 @@
+package cn.infstar.essentialsC.maintenance;
+
+import cn.infstar.essentialsC.EssentialsC;
+import cn.infstar.essentialsC.ModuleManager;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerLoginEvent;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.event.server.ServerListPingEvent;
+
+public final class MaintenanceListener implements Listener {
+
+    private final EssentialsC plugin;
+
+    public MaintenanceListener(EssentialsC plugin) {
+        this.plugin = plugin;
+    }
+
+    @EventHandler
+    public void onServerListPing(ServerListPingEvent event) {
+        MaintenanceManager maintenanceManager = plugin.getMaintenanceManager();
+        if (!plugin.getModuleManager().isEnabled(ModuleManager.MAINTENANCE)
+            || maintenanceManager == null
+            || !maintenanceManager.isEnabled()
+            || !maintenanceManager.isMotdEnabled()) {
+            return;
+        }
+
+        event.setMotd(maintenanceManager.getMotd());
+    }
+
+    @EventHandler
+    public void onPlayerLogin(PlayerLoginEvent event) {
+        MaintenanceManager maintenanceManager = plugin.getMaintenanceManager();
+        if (!plugin.getModuleManager().isEnabled(ModuleManager.MAINTENANCE)
+            || maintenanceManager == null
+            || !maintenanceManager.isEnabled()) {
+            return;
+        }
+
+        if (event.getPlayer().hasPermission(maintenanceManager.getBypassPermission())) {
+            return;
+        }
+
+        event.disallow(PlayerLoginEvent.Result.KICK_OTHER, maintenanceManager.getKickMessage());
+    }
+
+    @EventHandler
+    public void onPlayerJoin(PlayerJoinEvent event) {
+        MaintenanceManager maintenanceManager = plugin.getMaintenanceManager();
+        if (!plugin.getModuleManager().isEnabled(ModuleManager.MAINTENANCE) || maintenanceManager == null) {
+            return;
+        }
+
+        maintenanceManager.addBossBarPlayer(event.getPlayer());
+    }
+
+    @EventHandler
+    public void onPlayerQuit(PlayerQuitEvent event) {
+        MaintenanceManager maintenanceManager = plugin.getMaintenanceManager();
+        if (maintenanceManager != null) {
+            maintenanceManager.removeBossBarPlayer(event.getPlayer());
+        }
+    }
+}
diff --git a/src/main/java/cn/infstar/essentialsC/maintenance/MaintenanceManager.java b/src/main/java/cn/infstar/essentialsC/maintenance/MaintenanceManager.java
new file mode 100644
index 0000000..4967591
--- /dev/null
+++ b/src/main/java/cn/infstar/essentialsC/maintenance/MaintenanceManager.java
@@ -0,0 +1,178 @@
+package cn.infstar.essentialsC.maintenance;
+
+import cn.infstar.essentialsC.EssentialsC;
+import org.bukkit.ChatColor;
+import org.bukkit.boss.BarColor;
+import org.bukkit.boss.BarStyle;
+import org.bukkit.boss.BossBar;
+import org.bukkit.configuration.file.FileConfiguration;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.entity.Player;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+import java.util.Locale;
+
+public final class MaintenanceManager {
+
+    private static final int CURRENT_CONFIG_VERSION = 1;
+
+    private final EssentialsC plugin;
+    private final File configFile;
+    private FileConfiguration config;
+    private BossBar bossBar;
+
+    public MaintenanceManager(EssentialsC plugin) {
+        this.plugin = plugin;
+        this.configFile = new File(plugin.getDataFolder(), "maintenance.yml");
+        reload();
+    }
+
+    public void reload() {
+        if (!configFile.exists()) {
+            plugin.saveResource("maintenance.yml", false);
+        }
+
+        config = YamlConfiguration.loadConfiguration(configFile);
+        config.addDefault("config-version", CURRENT_CONFIG_VERSION);
+        config.addDefault("enabled", false);
+        config.addDefault("bypass-permission", "essentialsc.maintenance.bypass");
+        config.addDefault("motd.enabled", true);
+        config.addDefault("motd.lines", List.of("&c服务器维护中", "&7请稍后再试"));
+        config.addDefault("kick-message", List.of("&c服务器正在维护", "&7请稍后再进入"));
+        config.addDefault("bossbar.enabled", true);
+        config.addDefault("bossbar.title", "&c服务器正在维护");
+        config.addDefault("bossbar.color", "RED");
+        config.addDefault("bossbar.style", "SOLID");
+        config.addDefault("bossbar.progress", 1.0D);
+        config.options().copyDefaults(true);
+        save();
+        refreshBossBar();
+    }
+
+    public boolean isEnabled() {
+        return config.getBoolean("enabled", false);
+    }
+
+    public void setEnabled(boolean enabled) {
+        config.set("enabled", enabled);
+        save();
+        refreshBossBar();
+    }
+
+    public String getBypassPermission() {
+        return config.getString("bypass-permission", "essentialsc.maintenance.bypass");
+    }
+
+    public boolean isMotdEnabled() {
+        return config.getBoolean("motd.enabled", true);
+    }
+
+    public String getMotd() {
+        return colorizeLines(config.getStringList("motd.lines"));
+    }
+
+    public String getKickMessage() {
+        return colorizeLines(config.getStringList("kick-message"));
+    }
+
+    public void refreshBossBar() {
+        clearBossBar();
+        if (!isEnabled() || !isBossBarEnabled()) {
+            return;
+        }
+
+        bossBar = plugin.getServer().createBossBar(
+            colorize(config.getString("bossbar.title", "&c服务器正在维护")),
+            readBossBarColor(),
+            readBossBarStyle()
+        );
+        bossBar.setProgress(readBossBarProgress());
+        bossBar.setVisible(true);
+
+        for (Player player : plugin.getServer().getOnlinePlayers()) {
+            addBossBarPlayer(player);
+        }
+    }
+
+    public void addBossBarPlayer(Player player) {
+        if (bossBar == null || player == null || !player.isOnline()) {
+            return;
+        }
+        if (player.hasPermission(getBypassPermission())) {
+            bossBar.removePlayer(player);
+            return;
+        }
+        bossBar.addPlayer(player);
+    }
+
+    public void removeBossBarPlayer(Player player) {
+        if (bossBar != null && player != null) {
+            bossBar.removePlayer(player);
+        }
+    }
+
+    public void shutdown() {
+        clearBossBar();
+    }
+
+    private void clearBossBar() {
+        if (bossBar == null) {
+            return;
+        }
+
+        bossBar.removeAll();
+        bossBar = null;
+    }
+
+    private boolean isBossBarEnabled() {
+        return config.getBoolean("bossbar.enabled", true);
+    }
+
+    private BarColor readBossBarColor() {
+        try {
+            return BarColor.valueOf(config.getString("bossbar.color", "RED").toUpperCase(Locale.ROOT));
+        } catch (IllegalArgumentException ignored) {
+            return BarColor.RED;
+        }
+    }
+
+    private BarStyle readBossBarStyle() {
+        try {
+            return BarStyle.valueOf(config.getString("bossbar.style", "SOLID").toUpperCase(Locale.ROOT));
+        } catch (IllegalArgumentException ignored) {
+            return BarStyle.SOLID;
+        }
+    }
+
+    private double readBossBarProgress() {
+        double progress = config.getDouble("bossbar.progress", 1.0D);
+        if (!Double.isFinite(progress)) {
+            return 1.0D;
+        }
+        return Math.max(0.0D, Math.min(1.0D, progress));
+    }
+
+    private String colorizeLines(List<String> lines) {
+        if (lines == null || lines.isEmpty()) {
+            return "";
+        }
+
+        return String.join("\n", lines.stream()
+            .map(this::colorize)
+            .toList());
+    }
+
+    private String colorize(String text) {
+        return ChatColor.translateAlternateColorCodes('&', text == null ? "" : text);
+    }
+
+    private void save() {
+        try {
+            config.save(configFile);
+        } catch (IOException e) {
+            plugin.getLogger().warning("保存 maintenance.yml 失败: " + e.getMessage());
+        }
+    }
+}
diff --git a/src/main/resources/lang/en_US.yml b/src/main/resources/lang/en_US.yml
index 2048541..84f1b82 100644
--- a/src/main/resources/lang/en_US.yml
+++ b/src/main/resources/lang/en_US.yml
@@ -84,6 +84,7 @@ help:
     repair: "  &f/repair &7- Repair held or all items"
     admin: "  &f/essc admin &7- Toggle admin mode"
     tpsbar: "  &f/tpsbar [player] &7- Toggle TPS boss bar"
+    maintenance: "  &f/maintenance <on|off|status|reload> &7- Manage maintenance mode"
 
 blocks-menu:
   title: "&6&lEssentialsC &8- &e&lShortcut Menu"
@@ -170,3 +171,14 @@ mobdrops-menu:
     name: "&dEnderman Drops"
     status: "&7Current status: {status}"
     toggle: "&eClick to toggle"
+
+maintenance:
+  status:
+    enabled: "&cEnabled"
+    disabled: "&aDisabled"
+  messages:
+    enabled: "&aMaintenance mode enabled."
+    disabled: "&cMaintenance mode disabled."
+    reloaded: "&aMaintenance configuration reloaded."
+    status: "&7Maintenance mode status: {status}"
+    usage: "&cUsage: /maintenance <on|off|status|reload>"
diff --git a/src/main/resources/lang/zh_CN.yml b/src/main/resources/lang/zh_CN.yml
index ec42e07..bc6c2b5 100644
--- a/src/main/resources/lang/zh_CN.yml
+++ b/src/main/resources/lang/zh_CN.yml
@@ -84,6 +84,7 @@ help:
     repair: "  &f/repair &7- 修复手中或全部物品"
     admin: "  &f/essc admin &7- 切换管理模式"
     tpsbar: "  &f/tpsbar [玩家] &7- 切换 TPS 状态栏"
+    maintenance: "  &f/maintenance <on|off|status|reload> &7- 管理维护模式"
 
 blocks-menu:
   title: "&6&lEssentialsC &8- &e&l便捷菜单"
@@ -170,3 +171,14 @@ mobdrops-menu:
     name: "&d末影人掉落"
     status: "&7当前状态：{status}"
     toggle: "&e点击切换"
+
+maintenance:
+  status:
+    enabled: "&c开启"
+    disabled: "&a关闭"
+  messages:
+    enabled: "&a维护模式已开启。"
+    disabled: "&c维护模式已关闭。"
+    reloaded: "&a维护模式配置已重载。"
+    status: "&7维护模式当前状态：{status}"
+    usage: "&c用法：/maintenance <on|off|status|reload>"
diff --git a/src/main/resources/maintenance.yml b/src/main/resources/maintenance.yml
new file mode 100644
index 0000000..cb0be1d
--- /dev/null
+++ b/src/main/resources/maintenance.yml
@@ -0,0 +1,31 @@
+# EssentialsC 维护模式配置
+
+config-version: 1
+
+# 是否开启维护模式。
+enabled: false
+
+# 拥有该权限的玩家可以在维护模式下进入服务器。
+bypass-permission: "essentialsc.maintenance.bypass"
+
+motd:
+  # 维护模式开启时是否替换服务器列表 MOTD。
+  enabled: true
+  lines:
+    - "&c服务器维护中"
+    - "&7请稍后再试"
+
+kick-message:
+  - "&c服务器正在维护"
+  - "&7请稍后再进入"
+
+bossbar:
+  # 维护模式开启时是否向无绕过权限的在线玩家显示 BossBar。
+  enabled: true
+  title: "&c服务器正在维护"
+  # 可选值：PINK / BLUE / RED / GREEN / YELLOW / PURPLE / WHITE
+  color: RED
+  # 可选值：SOLID / SEGMENTED_6 / SEGMENTED_10 / SEGMENTED_12 / SEGMENTED_20
+  style: SOLID
+  # 进度范围：0.0 - 1.0
+  progress: 1.0
diff --git a/src/main/resources/modules.yml b/src/main/resources/modules.yml
index 1ca22c6..065bbd0 100644
--- a/src/main/resources/modules.yml
+++ b/src/main/resources/modules.yml
@@ -26,3 +26,6 @@ modules:
   mob-drops:
     # 末影人掉落控制菜单和监听器。默认关闭，用于保留过去标准版的行为。
     enabled: false
+  maintenance:
+    # 维护模式。开启维护后可替换 MOTD，并阻止无绕过权限的玩家进入。
+    enabled: true
diff --git a/src/main/resources/paper-plugin.yml b/src/main/resources/paper-plugin.yml
index f7e2184..0cd381c 100644
--- a/src/main/resources/paper-plugin.yml
+++ b/src/main/resources/paper-plugin.yml
@@ -92,6 +92,12 @@ permissions:
   essentialsc.command.tpsbar.others:
     description: 允许为其他玩家切换 /tpsbar
     default: op
+  essentialsc.command.maintenance:
+    description: 允许管理维护模式
+    default: op
+  essentialsc.maintenance.bypass:
+    description: 允许在维护模式下进入服务器
+    default: op
   essentialsc.shulkerbox.open:
     description: 允许通过 Shift+右键快捷打开潜影盒
     default: op
@@ -129,5 +135,7 @@ permissions:
       essentialsc.command.reload: true
       essentialsc.command.tpsbar: true
       essentialsc.command.tpsbar.others: true
+      essentialsc.command.maintenance: true
+      essentialsc.maintenance.bypass: true
       essentialsc.shulkerbox.open: true
       essentialsc.mobdrops.enderman: true