diff --git a/client/lib/l10n/app_text.dart b/client/lib/l10n/app_text.dart
index 53dc9cb..4983839 100644
--- a/client/lib/l10n/app_text.dart
+++ b/client/lib/l10n/app_text.dart
@@ -98,7 +98,7 @@ abstract class AppText {
   // 设备管理(P6):在线状态 / 操作 / 危险确认
   String get devOnline;
   String get devOffline;
-  String get devLastLogin; // 「最后登录」前缀
+  String get devLastOnline; // 「最后在线」前缀(离线设备,取 last_seen)
   String get devNeverLogin;
   String get devForceLogout;
   String get devClearLogin;
diff --git a/client/lib/l10n/strings_en.dart b/client/lib/l10n/strings_en.dart
index 109a3b9..3f25271 100644
--- a/client/lib/l10n/strings_en.dart
+++ b/client/lib/l10n/strings_en.dart
@@ -142,7 +142,7 @@ class StringsEn extends AppText {
   @override
   String get devOffline => 'Offline';
   @override
-  String get devLastLogin => 'Last login';
+  String get devLastOnline => 'Last online';
   @override
   String get devNeverLogin => 'Never logged in';
   @override
diff --git a/client/lib/l10n/strings_zh.dart b/client/lib/l10n/strings_zh.dart
index 2defd44..2c5cf1e 100644
--- a/client/lib/l10n/strings_zh.dart
+++ b/client/lib/l10n/strings_zh.dart
@@ -141,7 +141,7 @@ class StringsZh extends AppText {
   @override
   String get devOffline => '离线';
   @override
-  String get devLastLogin => '最后登录';
+  String get devLastOnline => '最后在线';
   @override
   String get devNeverLogin => '从未登录';
   @override
diff --git a/client/lib/widgets/account_screens.dart b/client/lib/widgets/account_screens.dart
index 69de294..e137e59 100644
--- a/client/lib/widgets/account_screens.dart
+++ b/client/lib/widgets/account_screens.dart
@@ -185,7 +185,9 @@ class DevicesScreen extends ConsumerWidget {
     final name = d.name.isNotEmpty ? d.name : d.platformKind.label;
     final subParts = <String>[d.platformKind.label];
     if (d.clientVersion.isNotEmpty) subParts.add(d.clientVersion);
-    if (!d.online) subParts.add('${t.devLastLogin} ${_rel(d.lastLogin)}');
+    // 离线设备显示「最后在线」——用 last_seen(连接/用量/~15s 会话轮询都会刷新),
+    // 而非 last_login(仅登录那一刻);否则一直在线的设备会错显成登录时间(如 13 小时前)。
+    if (!d.online) subParts.add('${t.devLastOnline} ${_rel(d.lastSeen)}');
 
     return Container(
       decoration: BoxDecoration(border: divider ? Border(bottom: BorderSide(color: c.border)) : null),