diff --git a/files/style.qss b/files/style.qss
new file mode 100644
index 0000000..46409c1
--- /dev/null
+++ b/files/style.qss
@@ -0,0 +1,117 @@
+/* style.qss - Windows 10/11 Light Theme */
+
+/* Global settings */
+QWidget {
+    font-family: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
+    font-size: 13px;
+    color: #000000;
+}
+
+/* Main Windows and Dialogs Background */
+QMainWindow, QDialog {
+    background-color: #F3F3F3;
+}
+
+/* Buttons */
+QPushButton {
+    background-color: #0078D4; /* Windows blue accent */
+    color: #FFFFFF;
+    border: 1px solid #005A9E;
+    border-radius: 4px;
+    padding: 6px 12px;
+}
+
+QPushButton:hover {
+    background-color: #005A9E; /* Slightly darker on hover */
+}
+
+QPushButton:pressed {
+    background-color: #004578; /* Even darker on press */
+}
+
+QPushButton:disabled {
+    background-color: #CCCCCC;
+    color: #666666;
+    border: 1px solid #AAAAAA;
+}
+
+/* Input Fields (QLineEdit, QTextEdit, QComboBox) */
+QLineEdit, QTextEdit, QComboBox, QDateEdit, QTimeEdit, QDateTimeEdit {
+    background-color: #FFFFFF;
+    border: 1px solid #CCCCCC;
+    border-radius: 4px;
+    padding: 4px;
+    selection-background-color: #0078D4;
+    selection-color: #FFFFFF;
+}
+
+QLineEdit:focus, QTextEdit:focus, QComboBox:focus, QDateEdit:focus, QTimeEdit:focus, QDateTimeEdit:focus {
+    border: 1px solid #0078D4; /* Accent color border on focus */
+}
+
+QLineEdit:disabled, QTextEdit:disabled, QComboBox:disabled, QDateEdit:disabled {
+    background-color: #E6E6E6;
+    color: #888888;
+}
+
+/* Table Widget */
+QTableWidget {
+    background-color: #FFFFFF;
+    alternate-background-color: #F9F9F9;
+    border: 1px solid #CCCCCC;
+    gridline-color: #E0E0E0;
+    selection-background-color: #0078D4;
+    selection-color: #FFFFFF;
+}
+
+QHeaderView::section {
+    background-color: #F0F0F0;
+    border: 1px solid #CCCCCC;
+    padding: 4px;
+    font-weight: bold;
+}
+
+/* Group Boxes */
+QGroupBox {
+    border: 1px solid #CCCCCC;
+    border-radius: 4px;
+    margin-top: 1ex; /* leave space at the top for the title */
+    padding-top: 10px;
+}
+
+QGroupBox::title {
+    subcontrol-origin: margin;
+    subcontrol-position: top left; /* position at the top left */
+    padding: 0 3px;
+    color: #0078D4;
+}
+
+/* Labels */
+QLabel {
+    background: transparent;
+}
+
+/* Tab Widget */
+QTabWidget::pane {
+    border: 1px solid #CCCCCC;
+    background-color: #FFFFFF;
+}
+
+QTabBar::tab {
+    background-color: #E1E1E1;
+    border: 1px solid #CCCCCC;
+    border-bottom-color: #CCCCCC; /* same as the pane color */
+    border-top-left-radius: 4px;
+    border-top-right-radius: 4px;
+    min-width: 8ex;
+    padding: 6px 12px;
+}
+
+QTabBar::tab:selected, QTabBar::tab:hover {
+    background-color: #FFFFFF;
+}
+
+QTabBar::tab:selected {
+    border-color: #CCCCCC;
+    border-bottom-color: #FFFFFF; /* same as pane color */
+}
diff --git a/main.py b/main.py
index c7f54d0..11bb0f3 100644
--- a/main.py
+++ b/main.py
@@ -222,7 +222,9 @@ def show_main_window():
             f"PyMASL ver. {system.software_version}. Пользователь: {user_full_name}. БД: {system.database}"
         )
         window.main_button_all_sales()
-        window.exec_()
+        # Сохраняем ссылку на окно, чтобы сборщик мусора не удалил его
+        QtWidgets.QApplication.instance().main_window = window
+        window.showMaximized()
 
 
 
@@ -429,7 +431,7 @@ def edit_client_in_sale(self) -> None:
         # Сохраняем параметры данных об уже существующем клиенте
         system.client_update = 1
         logger.info(f"Обновляем инф. клиента {system.client_id}")
-        client.exec_()
+        client.exec()
 
     def adding_new_client_to_sale(self) -> None:
         """
@@ -2344,7 +2346,7 @@ def open_pay_form(self, txt):
         # Передаем текст в форму PayForm
         pay.setText(txt)
 
-        res: int = pay.exec_()
+        res: int = pay.exec()
         # если пользователь нажал крестик или кнопку Escape,
         # то по-умолчанию возвращается QDialog.Rejected
         if res == QDialog.Rejected:
@@ -2523,7 +2525,7 @@ def get_slip(self) -> None:
         slip.ui.lineEdit.setText(rrn_value)
         slip.ui.textEdit.setText(load_slip)
         slip.show()
-        slip.exec_()
+        slip.exec()
 
 
 class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
@@ -3130,7 +3132,7 @@ def main_search_selected_sale(self) -> None:
             system.sale_id = int(sale_number)
             system.sale_tickets = client_in_sale
             logger.debug(f"Билеты сохраненной продажи: {system.sale_tickets}")
-            sale.exec_()
+            sale.exec()
 
     @logger_wraps(entry=True, exit=True, level="DEBUG")
     def main_button_all_sales(self) -> None:
@@ -3316,7 +3318,7 @@ def main_open_sale(self) -> None:
         system.sale_id = None
         system.sale_status = 0 # Т.е. новая продажа
         system.sale_tickets = None
-        sale.exec_()
+        sale.exec()
 
     def main_get_statistic(self) -> None:
         """
@@ -3556,7 +3558,22 @@ class Payment:
 if __name__ == "__main__":
     app = QtWidgets.QApplication(sys.argv)
     app.setStyle("Fusion")
+
+    # Загружаем QSS стили
+    try:
+        style_path = Path(__file__).parent / "files" / "style.qss"
+        if style_path.exists():
+            with open(style_path, "r", encoding="utf-8") as style_file:
+                app.setStyleSheet(style_file.read())
+        else:
+            logger.warning(f"Файл стилей не найден: {style_path}")
+    except Exception as e:
+        logger.error(f"Ошибка при загрузке стилей: {e}")
+
     auth = AuthForm()
     auth.show()
     auth.ui.label_9.setText(system.database)
-    sys.exit(app.exec())
+
+    exit_code = app.exec()
+    logger.complete()
+    sys.exit(exit_code)