diff --git a/app/dialogs/crop_dialog.py b/app/dialogs/crop_dialog.py
index 083b0db..8f77488 100644
--- a/app/dialogs/crop_dialog.py
+++ b/app/dialogs/crop_dialog.py
@@ -12,9 +12,9 @@ class CropDialog(QDialog):
                  current_page=0, viewer=None, parent=None):
         super().__init__(parent)
         self.setWindowTitle("Recadrer")
-        self.setMinimumWidth(450)
-        self.setModal(False)  # Non-modal pour pouvoir interagir avec le viewer
-        self.setWindowFlags(self.windowFlags() | Qt.WindowType.Tool)  # Reste au dessus
+        self.setFixedWidth(360)
+        self.setModal(False)
+        self.setWindowFlags(self.windowFlags() | Qt.WindowType.Tool)
         self._page_w = page_width_pt
         self._page_h = page_height_pt
         self._total_pages = total_pages
diff --git a/app/main_window.py b/app/main_window.py
index cef4c93..7291c15 100644
--- a/app/main_window.py
+++ b/app/main_window.py
@@ -65,111 +65,106 @@ class MainWindow(QMainWindow):
         self._setup_ui()
         self._setup_statusbar()
 
-        # Style global moderne
+        # Style gris moderne avec accents cyan
         self.setStyleSheet("""
             * { font-family: 'Segoe UI', sans-serif; }
 
-            QMainWindow { background: #1e1e2e; }
+            QMainWindow { background: #e8e8e8; }
 
             QMenuBar {
-                background: #181825; color: #cdd6f4; font-size: 13px;
-                padding: 3px 0; border-bottom: 1px solid #313244;
+                background: #f2f2f2; color: #2d2d2d; font-size: 13px;
+                padding: 2px 0; border-bottom: 1px solid #d0d0d0;
             }
-            QMenuBar::item { padding: 4px 12px; border-radius: 4px; margin: 1px 2px; }
-            QMenuBar::item:selected { background: #45475a; }
+            QMenuBar::item { padding: 5px 12px; border-radius: 4px; margin: 1px 2px; }
+            QMenuBar::item:selected { background: #d8d8d8; }
 
             QMenu {
-                background: #1e1e2e; color: #cdd6f4; border: 1px solid #45475a;
+                background: #ffffff; color: #2d2d2d; border: 1px solid #d0d0d0;
                 border-radius: 8px; padding: 4px;
             }
             QMenu::item { padding: 6px 24px; border-radius: 4px; }
-            QMenu::item:selected { background: #45475a; }
-            QMenu::separator { background: #313244; height: 1px; margin: 4px 12px; }
+            QMenu::item:selected { background: #e0f4ff; color: #006fa6; }
+            QMenu::separator { background: #e0e0e0; height: 1px; margin: 4px 12px; }
 
             QToolBar {
-                background: #181825; border: none; spacing: 2px; padding: 4px;
-                border-bottom: 1px solid #313244;
+                background: #f2f2f2; border: none; spacing: 2px; padding: 4px;
+                border-bottom: 1px solid #d0d0d0;
             }
             QToolBar QToolButton {
-                color: #bac2de; padding: 5px 10px; border-radius: 6px;
+                color: #444; padding: 5px 10px; border-radius: 6px;
                 font-size: 12px; border: 1px solid transparent;
             }
             QToolBar QToolButton:hover {
-                background: #313244; border: 1px solid #45475a; color: #cdd6f4;
+                background: #d8f0f8; border: 1px solid #00b4d8; color: #006fa6;
             }
-            QToolBar QToolButton:pressed { background: #45475a; }
+            QToolBar QToolButton:pressed { background: #b8e6f0; }
 
             QStatusBar {
-                background: #11111b; color: #6c7086; font-size: 11px;
-                border-top: 1px solid #313244;
+                background: #f2f2f2; color: #888; font-size: 11px;
+                border-top: 1px solid #d0d0d0;
             }
 
-            QSplitter::handle { background: #313244; width: 2px; }
-            QSplitter::handle:hover { background: #89b4fa; }
+            QSplitter::handle { background: #d0d0d0; width: 2px; }
+            QSplitter::handle:hover { background: #00b4d8; }
+
+            QDialog { background: #f5f5f5; color: #2d2d2d; }
 
-            QDialog {
-                background: #1e1e2e; color: #cdd6f4;
-            }
             QGroupBox {
-                color: #cdd6f4; border: 1px solid #45475a; border-radius: 8px;
+                color: #2d2d2d; border: 1px solid #d0d0d0; border-radius: 8px;
                 margin-top: 12px; padding-top: 16px; font-weight: bold;
+                background: #ffffff;
             }
             QGroupBox::title {
                 subcontrol-origin: margin; left: 12px; padding: 0 6px;
-                color: #89b4fa;
+                color: #00b4d8;
             }
-            QLabel { color: #cdd6f4; }
+
+            QLabel { color: #2d2d2d; }
+
             QLineEdit, QSpinBox, QDoubleSpinBox, QComboBox, QTextEdit {
-                background: #313244; color: #cdd6f4; border: 1px solid #45475a;
-                border-radius: 6px; padding: 4px 8px;
+                background: #ffffff; color: #2d2d2d; border: 1px solid #ccc;
+                border-radius: 6px; padding: 5px 8px;
             }
             QLineEdit:focus, QSpinBox:focus, QDoubleSpinBox:focus, QComboBox:focus, QTextEdit:focus {
-                border: 1px solid #89b4fa;
-            }
-            QComboBox::drop-down {
-                border: none; padding-right: 8px;
+                border: 1px solid #00b4d8;
             }
+            QComboBox::drop-down { border: none; padding-right: 8px; }
             QComboBox QAbstractItemView {
-                background: #313244; color: #cdd6f4; border: 1px solid #45475a;
-                selection-background-color: #45475a;
+                background: #ffffff; color: #2d2d2d; border: 1px solid #d0d0d0;
+                selection-background-color: #e0f4ff;
+                selection-color: #006fa6;
             }
+
             QPushButton {
-                background: #45475a; color: #cdd6f4; border: 1px solid #585b70;
+                background: #f0f0f0; color: #2d2d2d; border: 1px solid #ccc;
                 border-radius: 6px; padding: 6px 14px; font-size: 12px;
             }
-            QPushButton:hover { background: #585b70; border-color: #89b4fa; }
-            QPushButton:pressed { background: #313244; }
+            QPushButton:hover { background: #d8f0f8; border-color: #00b4d8; color: #006fa6; }
+            QPushButton:pressed { background: #b8e6f0; }
 
-            QRadioButton, QCheckBox { color: #cdd6f4; spacing: 6px; }
-            QRadioButton::indicator, QCheckBox::indicator {
-                width: 16px; height: 16px;
-            }
+            QRadioButton, QCheckBox { color: #2d2d2d; spacing: 6px; }
 
-            QDialogButtonBox QPushButton {
-                min-width: 80px;
-            }
+            QDialogButtonBox QPushButton { min-width: 80px; }
 
-            QProgressBar {
-                background: #11111b; border: none; height: 3px;
-            }
-            QProgressBar::chunk { background: #89b4fa; border-radius: 1px; }
+            QProgressBar { background: #e0e0e0; border: none; height: 3px; }
+            QProgressBar::chunk { background: #00b4d8; border-radius: 1px; }
 
             QScrollBar:vertical {
-                background: #181825; width: 10px; border: none;
+                background: #f0f0f0; width: 10px; border: none;
             }
             QScrollBar::handle:vertical {
-                background: #45475a; border-radius: 5px; min-height: 30px;
+                background: #c0c0c0; border-radius: 5px; min-height: 30px;
             }
-            QScrollBar::handle:vertical:hover { background: #585b70; }
+            QScrollBar::handle:vertical:hover { background: #a0a0a0; }
             QScrollBar::add-line, QScrollBar::sub-line { height: 0; }
 
             QScrollBar:horizontal {
-                background: #181825; height: 10px; border: none;
+                background: #f0f0f0; height: 10px; border: none;
             }
             QScrollBar::handle:horizontal {
-                background: #45475a; border-radius: 5px; min-width: 30px;
+                background: #c0c0c0; border-radius: 5px; min-width: 30px;
             }
-            QScrollBar::handle:horizontal:hover { background: #585b70; }
+            QScrollBar::handle:horizontal:hover { background: #a0a0a0; }
         """)
 
     # ── Drag & Drop ──
@@ -268,19 +263,19 @@ class MainWindow(QMainWindow):
         rtb.setOrientation(Qt.Orientation.Vertical)
         rtb.setStyleSheet("""
             QToolBar {
-                background: #181825; border-left: 1px solid #313244;
+                background: #f2f2f2; border-left: 1px solid #d0d0d0;
                 padding: 6px 4px; spacing: 1px;
             }
             QToolBar QToolButton {
-                color: #a6adc8; padding: 7px 4px; border-radius: 6px;
+                color: #555; padding: 7px 4px; border-radius: 6px;
                 font-size: 11px; min-width: 64px;
                 border: 1px solid transparent;
             }
             QToolBar QToolButton:hover {
-                background: #313244; color: #cdd6f4;
-                border: 1px solid #45475a;
+                background: #d8f0f8; color: #006fa6;
+                border: 1px solid #00b4d8;
             }
-            QToolBar QToolButton:pressed { background: #45475a; }
+            QToolBar QToolButton:pressed { background: #b8e6f0; }
         """)
         self.addToolBar(Qt.ToolBarArea.RightToolBarArea, rtb)
 
@@ -319,9 +314,9 @@ class MainWindow(QMainWindow):
         lbl = QLabel(text)
         lbl.setAlignment(Qt.AlignmentFlag.AlignCenter)
         lbl.setStyleSheet("""
-            color: #89b4fa; font-size: 9px; font-weight: bold;
+            color: #00b4d8; font-size: 9px; font-weight: bold;
             letter-spacing: 2px; padding: 8px 0 3px 0;
-            border-bottom: 1px solid #313244; margin: 0 4px;
+            border-bottom: 1px solid #d0d0d0; margin: 0 4px;
         """)
         return lbl
 
@@ -710,7 +705,7 @@ class MainWindow(QMainWindow):
         reader = PdfReader(self._current_file)
         page = reader.pages[self._viewer.current_page]
         w, h = get_page_size(page)
-        dlg = CropDialog(
+        self._crop_dlg = CropDialog(
             page_width_pt=w, page_height_pt=h,
             total_pages=len(reader.pages),
             current_page=self._viewer.current_page,
@@ -718,9 +713,9 @@ class MainWindow(QMainWindow):
             parent=self
         )
 
-        def on_accepted():
+        def on_crop_accepted():
             self._show_progress()
-            settings = dlg.get_settings()
+            settings = self._crop_dlg.get_settings()
             output = self._make_temp()
             try:
                 crop_pages(self._current_file, output, **settings)
@@ -728,9 +723,11 @@ class MainWindow(QMainWindow):
             except Exception as e:
                 self._hide_progress()
                 QMessageBox.critical(self, "Erreur", str(e))
+            self._crop_dlg = None
 
-        dlg.accepted.connect(on_accepted)
-        dlg.show()
+        self._crop_dlg.accepted.connect(on_crop_accepted)
+        self._crop_dlg.rejected.connect(lambda: setattr(self, '_crop_dlg', None))
+        self._crop_dlg.show()
 
     def _do_print(self):
         if not self._require_file():
diff --git a/app/page_panel.py b/app/page_panel.py
index b3004aa..8d55bbd 100644
--- a/app/page_panel.py
+++ b/app/page_panel.py
@@ -29,28 +29,28 @@ class PagePanel(QWidget):
         self._list.setSpacing(4)
         self._list.setStyleSheet("""
             QListWidget {
-                background: #181825;
+                background: #e0e0e0;
                 border: none;
-                border-right: 1px solid #313244;
+                border-right: 1px solid #d0d0d0;
                 padding: 4px;
             }
             QListWidget::item {
-                background: #1e1e2e;
-                border: 1px solid #313244;
+                background: #ffffff;
+                border: 1px solid #d0d0d0;
                 border-radius: 6px;
                 padding: 4px;
-                color: #a6adc8;
+                color: #555;
                 font-size: 10px;
                 margin: 2px 0;
             }
             QListWidget::item:hover {
-                background: #313244;
-                border-color: #45475a;
+                background: #e0f4ff;
+                border-color: #00b4d8;
             }
             QListWidget::item:selected {
-                background: #313244;
-                border: 1px solid #89b4fa;
-                color: #cdd6f4;
+                background: #d8f0f8;
+                border: 2px solid #00b4d8;
+                color: #006fa6;
             }
         """)
 
@@ -101,9 +101,9 @@ class PagePanel(QWidget):
 
         menu = QMenu(self)
         menu.setStyleSheet("""
-            QMenu { background: #1e1e2e; color: #cdd6f4; border: 1px solid #45475a; border-radius: 8px; padding: 4px; }
+            QMenu { background: #fff; color: #2d2d2d; border: 1px solid #d0d0d0; border-radius: 8px; padding: 4px; }
             QMenu::item { padding: 6px 20px; border-radius: 4px; }
-            QMenu::item:selected { background: #45475a; }
+            QMenu::item:selected { background: #e0f4ff; color: #006fa6; }
         """)
 
         act_insert = menu.addAction("Inserer une page blanche apres")
diff --git a/app/pdf_viewer.py b/app/pdf_viewer.py
index 3f4ebd5..fabc979 100644
--- a/app/pdf_viewer.py
+++ b/app/pdf_viewer.py
@@ -163,12 +163,12 @@ class PdfViewer(QWidget):
         self._scroll = QScrollArea()
         self._scroll.setWidgetResizable(True)
         self._scroll.setAlignment(Qt.AlignmentFlag.AlignCenter)
-        self._scroll.setStyleSheet("QScrollArea { background: #11111b; border: none; }")
+        self._scroll.setStyleSheet("QScrollArea { background: #d0d0d0; border: none; }")
 
         self._image_label = SelectableImageLabel()
         self._image_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
         self._image_label.setSizePolicy(QSizePolicy.Policy.Ignored, QSizePolicy.Policy.Ignored)
-        self._image_label.setStyleSheet("background: #11111b;")
+        self._image_label.setStyleSheet("background: #d0d0d0;")
         self._image_label.selection_changed.connect(self.selection_changed.emit)
         self._image_label.selection_done.connect(self.selection_done.emit)
         self._scroll.setWidget(self._image_label)
diff --git a/app/splash.py b/app/splash.py
index 5368463..80aa5b1 100644
--- a/app/splash.py
+++ b/app/splash.py
@@ -13,7 +13,7 @@ class SplashScreen(QWidget):
         self.setWindowFlags(Qt.WindowType.FramelessWindowHint | Qt.WindowType.WindowStaysOnTopHint)
         self.setAttribute(Qt.WidgetAttribute.WA_TranslucentBackground, False)
         self.setFixedSize(500, 400)
-        self.setStyleSheet("background-color: #0f172a;")
+        self.setStyleSheet("background-color: #f5f5f5; border: 1px solid #d0d0d0;")
 
         layout = QVBoxLayout(self)
         layout.setContentsMargins(40, 30, 40, 30)
@@ -36,14 +36,14 @@ class SplashScreen(QWidget):
         title = QLabel("COPYDEV IMPOSING TOOL")
         title.setAlignment(Qt.AlignmentFlag.AlignCenter)
         title.setFont(QFont("Segoe UI", 18, QFont.Weight.Bold))
-        title.setStyleSheet("color: white;")
+        title.setStyleSheet("color: #2d2d2d;")
         layout.addWidget(title)
 
         # Sous-titre
         subtitle = QLabel("Outil professionnel d'imposition PDF")
         subtitle.setAlignment(Qt.AlignmentFlag.AlignCenter)
         subtitle.setFont(QFont("Segoe UI", 11))
-        subtitle.setStyleSheet("color: #94a3b8;")
+        subtitle.setStyleSheet("color: #666;")
         layout.addWidget(subtitle)
 
         layout.addSpacing(20)
@@ -52,7 +52,7 @@ class SplashScreen(QWidget):
         self._status = QLabel("Demarrage...")
         self._status.setAlignment(Qt.AlignmentFlag.AlignCenter)
         self._status.setFont(QFont("Segoe UI", 9))
-        self._status.setStyleSheet("color: #64748b;")
+        self._status.setStyleSheet("color: #888;")
         layout.addWidget(self._status)
 
         layout.addStretch()
@@ -64,14 +64,14 @@ class SplashScreen(QWidget):
         )
         contact.setAlignment(Qt.AlignmentFlag.AlignCenter)
         contact.setFont(QFont("Segoe UI", 8))
-        contact.setStyleSheet("color: #475569;")
+        contact.setStyleSheet("color: #999;")
         layout.addWidget(contact)
 
         # Copyright
         copy_label = QLabel("2026 CopyDev - Tous droits reserves")
         copy_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
         copy_label.setFont(QFont("Segoe UI", 7))
-        copy_label.setStyleSheet("color: #334155;")
+        copy_label.setStyleSheet("color: #bbb;")
         layout.addWidget(copy_label)
 
         # Centrer sur l'ecran
diff --git a/app/updater.py b/app/updater.py
index 03eb086..6487a45 100644
--- a/app/updater.py
+++ b/app/updater.py
@@ -14,7 +14,7 @@ REPO = "jules/copydev-imposing-tool"
 BRANCH = "master"
 
 # Version actuelle (incrementee a chaque release)
-VERSION = "2.4.0"
+VERSION = "2.5.0"
 
 
 def get_remote_version():
diff --git a/version.txt b/version.txt
index 197c4d5..437459c 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-2.4.0
+2.5.0