diff --git a/lib/ui/board_home_screen.dart b/lib/ui/board_home_screen.dart
index 1822247..83ef2ba 100644
--- a/lib/ui/board_home_screen.dart
+++ b/lib/ui/board_home_screen.dart
@@ -6,6 +6,7 @@ import 'package:http/http.dart' as http;
 import '../config.dart';
 import '../function/board_list_controller.dart';
 import '../theme/app_palette.dart';
+import '../theme/theme_sync.dart';
 import 'board_post_detail_screen.dart';
 import 'board_report_screen.dart';
 import 'board_write_screen.dart';
@@ -149,7 +150,8 @@ class _BoardHomeScreenState extends State<BoardHomeScreen>
       floatingActionButton: _tabController == null
           ? null
           : FloatingActionButton(
-              backgroundColor: AppPalette.ink,
+              backgroundColor:
+                  globalProfileTheme.value?.accent ?? AppPalette.ink,
               foregroundColor: AppPalette.paper,
               onPressed: _openWrite,
               child: const Icon(Icons.edit_rounded),
diff --git a/lib/ui/board_post_detail_screen.dart b/lib/ui/board_post_detail_screen.dart
index 4af2953..40ecc9e 100644
--- a/lib/ui/board_post_detail_screen.dart
+++ b/lib/ui/board_post_detail_screen.dart
@@ -3,6 +3,7 @@
 import 'package:flutter/material.dart';
 import '../function/board_post_controller.dart';
 import '../theme/app_palette.dart';
+import '../theme/theme_sync.dart';
 import 'app_notice.dart';
 import 'title_pill.dart';
 
@@ -101,7 +102,8 @@ class _BoardPostDetailScreenState extends State<BoardPostDetailScreen> {
             const SizedBox(height: 14),
             ElevatedButton(
               style: ElevatedButton.styleFrom(
-                backgroundColor: AppPalette.ink,
+                backgroundColor:
+                    globalProfileTheme.value?.accent ?? AppPalette.ink,
                 foregroundColor: AppPalette.paper,
                 padding: const EdgeInsets.symmetric(vertical: 14),
               ),
diff --git a/lib/ui/device_checkout_ledger_page.dart b/lib/ui/device_checkout_ledger_page.dart
index f8f18cf..7c7f471 100644
--- a/lib/ui/device_checkout_ledger_page.dart
+++ b/lib/ui/device_checkout_ledger_page.dart
@@ -3,6 +3,7 @@
 import 'package:flutter/material.dart';
 import '../function/device_checkout_ledger_controller.dart';
 import '../theme/app_palette.dart';
+import '../theme/theme_sync.dart';
 import 'app_notice.dart';
 import 'title_pill.dart';
 
@@ -79,7 +80,8 @@ class _DeviceCheckoutLedgerPageState extends State<DeviceCheckoutLedgerPage> {
           ElevatedButton(
             autofocus: true,
             style: ElevatedButton.styleFrom(
-              backgroundColor: AppPalette.ink,
+              backgroundColor:
+                  globalProfileTheme.value?.accent ?? AppPalette.ink,
               foregroundColor: AppPalette.paper,
             ),
             onPressed: () async {
@@ -191,7 +193,9 @@ class _DeviceCheckoutLedgerPageState extends State<DeviceCheckoutLedgerPage> {
                                         _approve(r['id']);
                                       },
                                 style: ElevatedButton.styleFrom(
-                                  backgroundColor: AppPalette.ink,
+                                  backgroundColor:
+                                      globalProfileTheme.value?.accent ??
+                                      AppPalette.ink,
                                   foregroundColor: AppPalette.paper,
                                 ),
                                 child: const Text('승인'),
diff --git a/lib/ui/device_checkout_request_screen.dart b/lib/ui/device_checkout_request_screen.dart
index ad0614e..ec8e8e2 100644
--- a/lib/ui/device_checkout_request_screen.dart
+++ b/lib/ui/device_checkout_request_screen.dart
@@ -3,6 +3,7 @@
 import 'package:flutter/material.dart';
 import '../function/device_checkout_controller.dart';
 import '../theme/app_palette.dart';
+import '../theme/theme_sync.dart';
 import 'app_notice.dart';
 import 'title_pill.dart';
 
@@ -163,7 +164,9 @@ class _DeviceCheckoutRequestScreenState
                                   ? null
                                   : _submit,
                               style: ElevatedButton.styleFrom(
-                                backgroundColor: AppPalette.ink,
+                                backgroundColor:
+                                    globalProfileTheme.value?.accent ??
+                                    AppPalette.ink,
                                 foregroundColor: AppPalette.paper,
                                 shape: RoundedRectangleBorder(
                                   borderRadius: BorderRadius.circular(12),
diff --git a/lib/ui/friends_screen.dart b/lib/ui/friends_screen.dart
index 4850169..bfac50a 100644
--- a/lib/ui/friends_screen.dart
+++ b/lib/ui/friends_screen.dart
@@ -3,6 +3,7 @@
 import 'package:flutter/material.dart';
 import '../function/friend_controller.dart';
 import '../theme/app_palette.dart';
+import '../theme/theme_sync.dart';
 import 'app_notice.dart';
 import 'title_pill.dart';
 
@@ -63,7 +64,8 @@ class _FriendsScreenState extends State<FriendsScreen> {
           ),
           ElevatedButton(
             style: ElevatedButton.styleFrom(
-              backgroundColor: AppPalette.ink,
+              backgroundColor:
+                  globalProfileTheme.value?.accent ?? AppPalette.ink,
               foregroundColor: AppPalette.paper,
             ),
             onPressed: () => Navigator.pop(dialogContext, true),
@@ -159,7 +161,7 @@ class _FriendsScreenState extends State<FriendsScreen> {
             elevation: 0,
           ),
           floatingActionButton: FloatingActionButton.extended(
-            backgroundColor: AppPalette.ink,
+            backgroundColor: globalProfileTheme.value?.accent ?? AppPalette.ink,
             foregroundColor: AppPalette.paper,
             onPressed: _showAddFriendDialog,
             icon: const Icon(Icons.person_add_rounded),
@@ -217,7 +219,9 @@ class _FriendsScreenState extends State<FriendsScreen> {
                                     ),
                                     ElevatedButton(
                                       style: ElevatedButton.styleFrom(
-                                        backgroundColor: AppPalette.ink,
+                                        backgroundColor:
+                                            globalProfileTheme.value?.accent ??
+                                            AppPalette.ink,
                                         foregroundColor: AppPalette.paper,
                                       ),
                                       onPressed: () =>
diff --git a/lib/ui/group_detail_screen.dart b/lib/ui/group_detail_screen.dart
index b4b14a1..3a12161 100644
--- a/lib/ui/group_detail_screen.dart
+++ b/lib/ui/group_detail_screen.dart
@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import '../function/friend_controller.dart';
 import '../function/group_detail_controller.dart';
 import '../theme/app_palette.dart';
+import '../theme/theme_sync.dart';
 import 'app_notice.dart';
 import 'launchpad_transition.dart';
 import 'study_timer_screen.dart';
@@ -106,7 +107,9 @@ class _GroupDetailScreenState extends State<GroupDetailScreen> {
                           subtitle: Text('${f['studentId']}'),
                           trailing: ElevatedButton(
                             style: ElevatedButton.styleFrom(
-                              backgroundColor: AppPalette.ink,
+                              backgroundColor:
+                                  globalProfileTheme.value?.accent ??
+                                  AppPalette.ink,
                               foregroundColor: AppPalette.paper,
                             ),
                             onPressed: () async {
@@ -160,7 +163,8 @@ class _GroupDetailScreenState extends State<GroupDetailScreen> {
           ElevatedButton(
             autofocus: true,
             style: ElevatedButton.styleFrom(
-              backgroundColor: AppPalette.ink,
+              backgroundColor:
+                  globalProfileTheme.value?.accent ?? AppPalette.ink,
               foregroundColor: AppPalette.paper,
             ),
             onPressed: () => Navigator.pop(dialogContext, true),
@@ -289,7 +293,7 @@ class _GroupDetailScreenState extends State<GroupDetailScreen> {
             ],
           ),
           floatingActionButton: FloatingActionButton.extended(
-            backgroundColor: AppPalette.ink,
+            backgroundColor: globalProfileTheme.value?.accent ?? AppPalette.ink,
             foregroundColor: AppPalette.paper,
             onPressed: _showInviteSheet,
             icon: const Icon(Icons.person_add_rounded),
@@ -400,7 +404,9 @@ class _GroupDetailScreenState extends State<GroupDetailScreen> {
                                 ),
                                 ElevatedButton(
                                   style: ElevatedButton.styleFrom(
-                                    backgroundColor: AppPalette.ink,
+                                    backgroundColor:
+                                        globalProfileTheme.value?.accent ??
+                                        AppPalette.ink,
                                     foregroundColor: AppPalette.paper,
                                   ),
                                   onPressed: () => _respondJoinRequest(
diff --git a/lib/ui/group_list_screen.dart b/lib/ui/group_list_screen.dart
index ea46fb7..91a77fe 100644
--- a/lib/ui/group_list_screen.dart
+++ b/lib/ui/group_list_screen.dart
@@ -3,6 +3,7 @@
 import 'package:flutter/material.dart';
 import '../function/group_controller.dart';
 import '../theme/app_palette.dart';
+import '../theme/theme_sync.dart';
 import 'app_notice.dart';
 import 'group_detail_screen.dart';
 import 'launchpad_transition.dart';
@@ -86,7 +87,8 @@ class _GroupListScreenState extends State<GroupListScreen> {
             ),
             ElevatedButton(
               style: ElevatedButton.styleFrom(
-                backgroundColor: AppPalette.ink,
+                backgroundColor:
+                    globalProfileTheme.value?.accent ?? AppPalette.ink,
                 foregroundColor: AppPalette.paper,
               ),
               onPressed: () => Navigator.pop(dialogContext, true),
@@ -183,7 +185,7 @@ class _GroupListScreenState extends State<GroupListScreen> {
             elevation: 0,
           ),
           floatingActionButton: FloatingActionButton.extended(
-            backgroundColor: AppPalette.ink,
+            backgroundColor: globalProfileTheme.value?.accent ?? AppPalette.ink,
             foregroundColor: AppPalette.paper,
             onPressed: _showCreateGroupDialog,
             icon: const Icon(Icons.add_rounded),
@@ -241,7 +243,9 @@ class _GroupListScreenState extends State<GroupListScreen> {
                                     ),
                                     ElevatedButton(
                                       style: ElevatedButton.styleFrom(
-                                        backgroundColor: AppPalette.ink,
+                                        backgroundColor:
+                                            globalProfileTheme.value?.accent ??
+                                            AppPalette.ink,
                                         foregroundColor: AppPalette.paper,
                                       ),
                                       onPressed: () => _respondInvite(
@@ -447,7 +451,11 @@ class _GroupListScreenState extends State<GroupListScreen> {
                                     else
                                       ElevatedButton(
                                         style: ElevatedButton.styleFrom(
-                                          backgroundColor: AppPalette.ink,
+                                          backgroundColor:
+                                              globalProfileTheme
+                                                  .value
+                                                  ?.accent ??
+                                              AppPalette.ink,
                                           foregroundColor: AppPalette.paper,
                                         ),
                                         onPressed: () =>
diff --git a/lib/ui/study_calendar_screen.dart b/lib/ui/study_calendar_screen.dart
index 4fb54df..aefa5bd 100644
--- a/lib/ui/study_calendar_screen.dart
+++ b/lib/ui/study_calendar_screen.dart
@@ -4,6 +4,7 @@
 import 'package:flutter/material.dart';
 import '../function/study_calendar_controller.dart';
 import '../theme/app_palette.dart';
+import '../theme/theme_sync.dart';
 import 'app_notice.dart';
 import 'title_pill.dart';
 
@@ -153,7 +154,8 @@ class _StudyCalendarScreenState extends State<StudyCalendarScreen> {
                   Expanded(
                     child: ElevatedButton(
                       style: ElevatedButton.styleFrom(
-                        backgroundColor: AppPalette.ink,
+                        backgroundColor:
+                            globalProfileTheme.value?.accent ?? AppPalette.ink,
                         foregroundColor: AppPalette.paper,
                       ),
                       onPressed: () async {