diff --git a/CMakeLists.txt b/CMakeLists.txt
index a4642bd..6c4ebaf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ project(Minecraft_launcher VERSION 0.1 LANGUAGES CXX)
 
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(Qt6 REQUIRED COMPONENTS Quick)
+find_package(Qt6 REQUIRED COMPONENTS Quick Core)
 
 qt_standard_project_setup(REQUIRES 6.8)
 
@@ -14,6 +14,9 @@ qt_add_executable(appMinecraft_launcher
 
 qt_add_qml_module(appMinecraft_launcher
     URI Minecraft_launcher
+    SOURCES
+        launcherbackend.h
+        launcherbackend.cpp
     QML_FILES
         Main.qml
         RESOURCES images/Folder/Folder_Active.svg images/Folder/Folder_Idle.svg images/Folder/Folder_Pressed.svg images/Options/Options_active.svg images/Options/Options_Idle.svg images/Options/Options_Pressed.svg images/Play_Button/Play_Active.svg images/Play_Button/Play_Idle.svg images/Play_Button/Play_pressed.svg images/Profile_Box/Asset_23.svg images/Profile_Box/Asset_24.svg images/Profile_Box/Kishka_Profile_Active.svg images/Profile_Box/Kishka_Profile_Idle.svg images/Profile_Box/Kishka_Profile_open.svg images/Scroll/Scroll_Lever.svg images/Scroll/Scroll_palka.svg images/Version_box/Kishka_Profile_Open.svg images/Version_box/Kishka_Ver_Active.svg images/Version_box/Kishka_Ver_idle.svg images/GovuztTW8AAHqBf.jpeg images/photo_2025-12-16_15-04-17.jpg images/photo_2025-12-21_02-30-09.jpg
@@ -32,7 +35,7 @@ set_target_properties(appMinecraft_launcher PROPERTIES
 )
 
 target_link_libraries(appMinecraft_launcher
-    PRIVATE Qt6::Quick
+    PRIVATE Qt6::Quick Qt6::Core
 )
 
 include(GNUInstallDirs)
diff --git a/Main.qml b/Main.qml
index 4c81fa2..f81f410 100644
--- a/Main.qml
+++ b/Main.qml
@@ -1,6 +1,7 @@
 import QtQuick
 import QtQuick.Layouts 2.15
 import QtQuick.Controls 2.15
+import Minecraft_launcher
 
 Window {
     id: window
@@ -8,62 +9,79 @@ Window {
     height: 720
     visible: true
     flags: Qt.Window
-    title: qsTr("Hello World")
+    title: qsTr("Minecraft Launcher")
 
+    // ── Backend ────────────────────────────────────────────────────────────
+    LauncherBackend {
+        id: backend
+        onLaunched: (profileName, versionName, serverUrl) => {
+            console.log("Запуск: профиль=" + profileName
+                        + " версия=" + versionName
+                        + " сервер=" + serverUrl)
+        }
+        onLaunchError: (message) => {
+            errorLabel.text = message
+            errorTimer.restart()
+        }
+    }
+
+    // ── Background ─────────────────────────────────────────────────────────
     Image {
         id: image
         opacity: 0.296
-        visible: true
         anchors.fill: parent
-        horizontalAlignment: Image.AlignHCenter
-        verticalAlignment: Image.AlignVCenter
         source: "images/GovuztTW8AAHqBf.jpeg"
-        focus: false
-        activeFocusOnTab: false
-        state: ""
-        layer.enabled: false
-        antialiasing: false
-        clip: false
-        transformOrigin: Item.Center
-        scale: 1
-        mirror: false
-        mipmap: false
-        cache: true
-        autoTransform: true
-        asynchronous: false
-        sourceSize.height: 0
-        sourceSize.width: 0
         fillMode: Image.Stretch
     }
 
+    // ── Error toast ────────────────────────────────────────────────────────
+    Rectangle {
+        visible: errorLabel.text !== ""
+        anchors.horizontalCenter: parent.horizontalCenter
+        anchors.bottom: parent.bottom
+        anchors.bottomMargin: 40
+        width: errorLabel.implicitWidth + 32
+        height: 40
+        radius: 8
+        color: "#cc3333"
+
+        Text {
+            id: errorLabel
+            anchors.centerIn: parent
+            color: "#ffffff"
+            font.pixelSize: 14
+        }
+
+        Timer {
+            id: errorTimer
+            interval: 3000
+            onTriggered: errorLabel.text = ""
+        }
+    }
+
+    // ── Play button ────────────────────────────────────────────────────────
     Button {
         id: button
-        x: 440
-        y: 105
         width: 335
         height: 170
-        hoverEnabled: false
         anchors.centerIn: parent
-        opacity: 1
+        hoverEnabled: false
+
         background: Image {
             id: buttonImage
             source: "images/Play_Button/Play_Active.svg"
         }
 
-        Connections {
-            target: button
-            function onPressed() { buttonImage.source = "images/Play_Button/Play_pressed.svg" }
-        }
-
-        Connections {
-            target: button
-            function onReleased() { buttonImage.source = "images/Play_Button/Play_Active.svg" }
-        }
+        onPressed:  buttonImage.source = "images/Play_Button/Play_pressed.svg"
+        onReleased: buttonImage.source = "images/Play_Button/Play_Active.svg"
+        onClicked:  backend.launchGame(profileBox.currentIndex, versionBox.currentIndex)
     }
 
+    // ── Profile ComboBox ───────────────────────────────────────────────────
     ComboBox {
         id: profileBox
-        width: 117
+        y: 451
+        width: 146
         height: 42
         anchors.left: button.right
         anchors.bottom: button.top
@@ -72,235 +90,541 @@ Window {
         editable: false
         leftPadding: -30
 
-        model: ["First","Second","Third"]
+        model: backend.profileNames
 
-
-        delegate: ItemDelegate {
-            id: delegate
-
-            required property var model
-            required property int index
-
-            width: profileBox.width
-            contentItem: Text {
-                text: delegate.model[profileBox.textRole]
-                color: "#ffffff"
-                font: profileBox.font
-                elide: Text.ElideRight
-                horizontalAlignment: Text.AlignLeft
-                verticalAlignment: Text.AlignVCenter
-
-
-            }
-            highlighted: profileBox.highlightedIndex === index
-            background: Rectangle{
-                color: delegate.highlighted ? "#91B315" : "#232323"
-                radius: 5
-
-            }
-        }
         indicator: Image {
-            id: dropDownArrow
+            width: 10; height: 10
             visible: true
-            horizontalAlignment: Image.AlignRight
-            anchors.leftMargin: 10
             anchors.left: parent.left
+            anchors.leftMargin: 10
             anchors.verticalCenter: parent.verticalCenter
-            source: profileBox.down ? "images/Profile_Box/Asset_23.svg" : "images/Profile_Box/Asset_24.svg"
-            transformOrigin: Item.Center
-            sourceSize.height: 10
-            sourceSize.width: 10
+            source: profileBox.down ? "images/Profile_Box/Asset_23.svg"
+                                    : "images/Profile_Box/Asset_24.svg"
+            rotation: 180
+            sourceSize.width: 10; sourceSize.height: 10
             fillMode: Image.PreserveAspectFit
             autoTransform: true
-            width: 10
-            height: 10
         }
 
-        /*indicator: Canvas {
-            id: canvas
-            y: profileBox.topPadding + (profileBox.availableHeight - height) / 2
-            width: 12
-            height: 8
-            anchors.left: parent.left
-            anchors.leftMargin: 117
-            contextType: "2d"
-
-            onPaint: {
-                context.reset();
-                context.moveTo(0, 0);
-                context.lineTo(width, 0);
-                context.lineTo(width / 2, height);
-                context.closePath();
-                context.fillStyle = profileBox.pressed ? "#ffffff" : "#232323";
-                context.fill();
-            }
-        }*/
-
-        Connections {
-            target: profileBox
-            function onActivated() { canvas.requestPaint(); }
-        }
-
-        Connections {
-            target: profileBox
-            function onActivated() { dropDownArrow.visible = true }
-        }
         contentItem: Text {
-            leftPadding: 0
+            x: 26
+            width: 114
             rightPadding: profileBox.indicator.width + profileBox.spacing
-
             text: profileBox.displayText
             font: profileBox.font
-            color: profileBox.pressed ? "#ffffff" : "#ffffff"
+            color: "#ffffff"
             verticalAlignment: Text.AlignVCenter
-            elide: Text.ElideRight
             horizontalAlignment: Text.AlignHCenter
-
+            elide: Text.ElideRight
         }
 
         background: Rectangle {
-            implicitWidth: 120
-            implicitHeight: 40
-            border.color: profileBox.pressed ? "#ffffff" : "#232323"
-            border.width: profileBox.visualFocus ? 2 : 1
+            implicitWidth: 120; implicitHeight: 40
             color: profileBox.down ? "#91B315" : "#232323"
             radius: 6
+            border.color: profileBox.pressed ? "#ffffff" : "#232323"
+            border.width: profileBox.visualFocus ? 2 : 1
         }
 
         popup: Popup {
             y: profileBox.height - 1
             width: profileBox.width
-            height: Math.min(contentItem.implicitHeight, profileBox.Window.height - topMargin - bottomMargin)
-            padding: 1
+            padding: 0
+            // Высота = кнопка "+" (32) + элементы списка, не более 200
+            height: 32 + Math.min(profileItemList.contentHeight, 200)
 
-            contentItem: ListView {
-                rotation: 0
-                clip: true
-                implicitHeight: contentHeight
-                model: profileBox.popup.visible ? profileBox.delegateModel : null
-                currentIndex: profileBox.highlightedIndex
+            contentItem: Item {
+                anchors.fill: parent
 
+                // ── "+" button — всегда сверху ──────────────────────────
+                Rectangle {
+                    id: profileAddBtnBg
+                    anchors.top: parent.top
+                    anchors.left: parent.left
+                    anchors.right: parent.right
+                    height: 32
+                    color: profileAddArea.containsPress ? "#2d2d2d" : "transparent"
 
-
-                ScrollIndicator.vertical: ScrollIndicator {
-                    parent: ListView.parent
-                    anchors.top: ListView.top
-                    anchors.left: ListView.right
-                    anchors.bottom: ListView.bottom
-
-                    /*background: Rectangle{
-                        opacity: 0.5
+                    Text {
+                        anchors.centerIn: parent
+                        text: "+ Добавить профиль"
                         color: "#91B315"
-                    }*/
+                        font.pixelSize: 12
+                    }
 
+                    MouseArea {
+                        id: profileAddArea
+                        anchors.fill: parent
+                        onClicked: {
+                            profileBox.popup.close()
+                            addProfileDialog.open()
+                        }
+                    }
+                }
+
+                // ── Добавленные профили — всегда ниже кнопки ───────────
+                ListView {
+                    id: profileItemList
+                    anchors.top: profileAddBtnBg.bottom
+                    anchors.left: parent.left
+                    anchors.right: parent.right
+                    height: Math.min(contentHeight, 200)
+                    clip: true
+                    model: backend.profileNames
+
+                    delegate: ItemDelegate {
+                        id: profileItem
+                        required property string modelData
+                        required property int index
+                        width: profileItemList.width
+                        height: 40
+                        contentItem: Text {
+                            text: profileItem.modelData
+                            color: "#ffffff"
+                            font: profileBox.font
+                            elide: Text.ElideRight
+                            horizontalAlignment: Text.AlignLeft
+                            verticalAlignment: Text.AlignVCenter
+                            leftPadding: 8
+                        }
+                        background: Rectangle {
+                            color: (profileBox.currentIndex === profileItem.index || profileItem.hovered)
+                                   ? "#91B315" : "#232323"
+                            radius: 5
+                        }
+                        onClicked: {
+                            profileBox.currentIndex = profileItem.index
+                            profileBox.popup.close()
+                        }
+                    }
+
+                    ScrollIndicator.vertical: ScrollIndicator {
+                        parent: profileItemList.parent
+                        anchors.top: profileItemList.top
+                        anchors.left: profileItemList.right
+                        anchors.bottom: profileItemList.bottom
+                    }
                 }
             }
 
             background: Rectangle {
-                border.color: "#232323"
                 color: "#232323"
                 radius: 6
+                border.color: "#232323"
             }
         }
-
     }
 
+    // ── Version ComboBox ───────────────────────────────────────────────────
     ComboBox {
         id: versionBox
-        width: 210
+        x: 624
+        y: 451
+        width: 183
         height: 42
         anchors.right: button.right
         anchors.bottom: button.top
         anchors.bottomMargin: -218
+        editable: false
+        leftPadding: -30
+
+        model: backend.versionNames
+
+        indicator: Image {
+            width: 10; height: 10
+            visible: true
+            anchors.left: parent.left
+            anchors.leftMargin: 10
+            anchors.verticalCenter: parent.verticalCenter
+            source: versionBox.down ? "images/Profile_Box/Asset_23.svg"
+                                    : "images/Profile_Box/Asset_24.svg"
+            rotation: 180
+            sourceSize.width: 10; sourceSize.height: 10
+            fillMode: Image.PreserveAspectFit
+            autoTransform: true
+        }
+
+        contentItem: Text {
+            x: 26
+            width: 150
+            leftPadding: 56
+            rightPadding: versionBox.indicator.width + versionBox.spacing
+            text: versionBox.displayText
+            font: versionBox.font
+            color: "#ffffff"
+            verticalAlignment: Text.AlignVCenter
+            horizontalAlignment: Text.AlignLeft
+            elide: Text.ElideRight
+        }
+
+        background: Rectangle {
+            implicitWidth: 120; implicitHeight: 40
+            color: versionBox.down ? "#91B315" : "#232323"
+            radius: 6
+            border.color: versionBox.pressed ? "#ffffff" : "#232323"
+            border.width: versionBox.visualFocus ? 2 : 1
+        }
+
         popup: Popup {
             y: versionBox.height - 1
             width: versionBox.width
-            height: Math.min(contentItem.implicitHeight, versionBox.Window.height - topMargin - bottomMargin)
-            padding: 1
-            contentItem: ListView {
-                rotation: 0
-                model: versionBox.popup.visible ? versionBox.delegateModel : null
-                implicitHeight: contentHeight
-                currentIndex: versionBox.highlightedIndex
-                clip: true
-                ScrollIndicator.vertical: ScrollIndicator {
-                    anchors.left: ListView.right
-                    anchors.top: ListView.top
-                    anchors.bottom: ListView.bottom
-                    parent: ListView.parent
+            padding: 0
+            height: 32 + Math.min(versionItemList.contentHeight, 200)
+
+            contentItem: Item {
+                anchors.fill: parent
+
+                // ── "+" button — всегда сверху ──────────────────────────
+                Rectangle {
+                    id: versionAddBtnBg
+                    anchors.top: parent.top
+                    anchors.left: parent.left
+                    anchors.right: parent.right
+                    height: 32
+                    color: versionAddArea.containsPress ? "#2d2d2d" : "transparent"
+
+                    Text {
+                        anchors.centerIn: parent
+                        text: "+ Добавить версию"
+                        color: "#91B315"
+                        font.pixelSize: 12
+                    }
+
+                    MouseArea {
+                        id: versionAddArea
+                        anchors.fill: parent
+                        onClicked: {
+                            versionBox.popup.close()
+                            addVersionDialog.open()
+                        }
+                    }
+                }
+
+                // ── Добавленные версии — всегда ниже кнопки ────────────
+                ListView {
+                    id: versionItemList
+                    anchors.top: versionAddBtnBg.bottom
+                    anchors.left: parent.left
+                    anchors.right: parent.right
+                    height: Math.min(contentHeight, 200)
+                    clip: true
+                    model: backend.versionNames
+
+                    delegate: ItemDelegate {
+                        id: versionItem
+                        required property string modelData
+                        required property int index
+                        width: versionItemList.width
+                        height: 40
+                        contentItem: Text {
+                            text: versionItem.modelData
+                            color: "#ffffff"
+                            font: versionBox.font
+                            elide: Text.ElideRight
+                            horizontalAlignment: Text.AlignLeft
+                            verticalAlignment: Text.AlignVCenter
+                            leftPadding: 8
+                        }
+                        background: Rectangle {
+                            color: (versionBox.currentIndex === versionItem.index || versionItem.hovered)
+                                   ? "#91B315" : "#232323"
+                            radius: 5
+                        }
+                        onClicked: {
+                            versionBox.currentIndex = versionItem.index
+                            versionBox.popup.close()
+                        }
+                    }
+
+                    ScrollIndicator.vertical: ScrollIndicator {
+                        parent: versionItemList.parent
+                        anchors.top: versionItemList.top
+                        anchors.left: versionItemList.right
+                        anchors.bottom: versionItemList.bottom
+                    }
                 }
             }
+
             background: Rectangle {
                 color: "#232323"
                 radius: 6
                 border.color: "#232323"
             }
         }
-        model: ["Version 1","Version 2","Version 3"]
-        leftPadding: -30
-        indicator: Image {
-            id: dropDownArrow1
-            width: 10
-            height: 10
-            visible: true
-            anchors.verticalCenter: parent.verticalCenter
-            anchors.left: parent.left
-            anchors.leftMargin: 10
-            horizontalAlignment: Image.AlignRight
-            source: versionBox.down ? "images/Profile_Box/Asset_23.svg" : "images/Profile_Box/Asset_24.svg"
-            transformOrigin: Item.Center
-            sourceSize.width: 10
-            sourceSize.height: 10
-            fillMode: Image.PreserveAspectFit
-            autoTransform: true
-        }
-        editable: false
-        delegate: ItemDelegate {
-            id: delegate1
-            width: versionBox.width
-            required property var model
-            required property int index
-            highlighted: versionBox.highlightedIndex === index
-            contentItem: Text {
-                color: "#ffffff"
-                text: delegate1.model[versionBox.textRole]
-                elide: Text.ElideRight
-                horizontalAlignment: Text.AlignLeft
-                verticalAlignment: Text.AlignVCenter
-                font: versionBox.font
-            }
-            background: Rectangle {
-                color: delegate1.highlighted ? "#91B315" : "#232323"
-                radius: 5
-            }
-        }
-        Connections {
-            target: versionBox
-            function onActivated() { canvas.requestPaint(); }
+    }
+
+    // ── Add Profile Dialog ─────────────────────────────────────────────────
+    // Bug fix: header/footer must be Item (not Rectangle) with explicit
+    // implicitHeight so Dialog correctly computes its own total height.
+    // Rectangle.implicitHeight defaults to 0 regardless of height:.
+    Dialog {
+        id: addProfileDialog
+        modal: true
+        width: 320
+        x: (window.width  - width)  / 2
+        y: (window.height - height) / 2
+        padding: 0
+
+        background: Rectangle {
+            color: "#1e1e1e"
+            radius: 10
+            border.color: "#91B315"
+            border.width: 1
         }
 
-        Connections {
-            target: versionBox
-            function onActivated() { dropDownArrow1.visible = true }
+        header: Item {
+            implicitHeight: 52      // tells Dialog how tall the header is
+            Text {
+                anchors.centerIn: parent
+                text: "Новый профиль"
+                color: "#ffffff"
+                font.pixelSize: 17
+                font.bold: true
+            }
+            Rectangle {
+                anchors.bottom: parent.bottom
+                width: parent.width
+                height: 1
+                color: "#333333"
+            }
         }
-        contentItem: Text {
-            color: versionBox.pressed ? "#ffffff" : "#ffffff"
-            text: versionBox.displayText
-            elide: Text.ElideRight
-            horizontalAlignment: Text.AlignLeft
-            verticalAlignment: Text.AlignVCenter
-            rightPadding: versionBox.indicator.width + versionBox.spacing
-            leftPadding: 56
-            font: versionBox.font
+
+        contentItem: Column {
+            spacing: 12
+            topPadding: 20
+            bottomPadding: 20
+
+            TextField {
+                id: pfName
+                x: 20
+                width: parent.width - 40
+                placeholderText: "Имя профиля"
+                color: "#ffffff"
+                placeholderTextColor: "#666666"
+                background: Rectangle {
+                    color: "#2a2a2a"
+                    radius: 6
+                    border.color: pfName.activeFocus ? "#91B315" : "#444444"
+                    border.width: 1
+                }
+            }
+
+            TextField {
+                id: pfLogin
+                x: 20
+                width: parent.width - 40
+                placeholderText: "Логин"
+                color: "#ffffff"
+                placeholderTextColor: "#666666"
+                background: Rectangle {
+                    color: "#2a2a2a"
+                    radius: 6
+                    border.color: pfLogin.activeFocus ? "#91B315" : "#444444"
+                    border.width: 1
+                }
+            }
+
+            TextField {
+                id: pfPassword
+                x: 20
+                width: parent.width - 40
+                placeholderText: "Пароль"
+                echoMode: TextInput.Password
+                color: "#ffffff"
+                placeholderTextColor: "#666666"
+                background: Rectangle {
+                    color: "#2a2a2a"
+                    radius: 6
+                    border.color: pfPassword.activeFocus ? "#91B315" : "#444444"
+                    border.width: 1
+                }
+            }
         }
-        background: Rectangle {
-            color: versionBox.down ? "#91B315" : "#232323"
-            radius: 6
-            border.color: versionBox.pressed ? "#ffffff" : "#232323"
-            border.width: versionBox.visualFocus ? 2 : 1
-            implicitWidth: 120
-            implicitHeight: 40
+
+        footer: Item {
+            implicitHeight: 60      // tells Dialog how tall the footer is
+            Rectangle {
+                anchors.top: parent.top
+                width: parent.width
+                height: 1
+                color: "#333333"
+            }
+            Row {
+                anchors.centerIn: parent
+                spacing: 12
+
+                Button {
+                    text: "Отмена"
+                    width: 110; height: 36
+                    contentItem: Text {
+                        text: parent.text
+                        color: "#ffffff"
+                        horizontalAlignment: Text.AlignHCenter
+                        verticalAlignment: Text.AlignVCenter
+                    }
+                    background: Rectangle {
+                        color: parent.pressed ? "#444444" : "#333333"
+                        radius: 6
+                    }
+                    onClicked: addProfileDialog.reject()
+                }
+
+                Button {
+                    text: "Добавить"
+                    width: 110; height: 36
+                    contentItem: Text {
+                        text: parent.text
+                        color: "#ffffff"
+                        horizontalAlignment: Text.AlignHCenter
+                        verticalAlignment: Text.AlignVCenter
+                    }
+                    background: Rectangle {
+                        color: parent.pressed ? "#6a8510" : "#91B315"
+                        radius: 6
+                    }
+                    onClicked: addProfileDialog.accept()
+                }
+            }
+        }
+
+        onAccepted: {
+            const name = pfName.text.trim()
+            if (name !== "") {
+                backend.addProfile(name, pfLogin.text.trim(), pfPassword.text)
+                profileBox.currentIndex = backend.profileNames.length - 1
+            }
+            pfName.text = ""; pfLogin.text = ""; pfPassword.text = ""
+        }
+        onRejected: {
+            pfName.text = ""; pfLogin.text = ""; pfPassword.text = ""
         }
     }
 
+    // ── Add Version Dialog ─────────────────────────────────────────────────
+    Dialog {
+        id: addVersionDialog
+        modal: true
+        width: 320
+        x: (window.width  - width)  / 2
+        y: (window.height - height) / 2
+        padding: 0
+
+        background: Rectangle {
+            color: "#1e1e1e"
+            radius: 10
+            border.color: "#91B315"
+            border.width: 1
+        }
+
+        header: Item {
+            implicitHeight: 52
+            Text {
+                anchors.centerIn: parent
+                text: "Новая версия"
+                color: "#ffffff"
+                font.pixelSize: 17
+                font.bold: true
+            }
+            Rectangle {
+                anchors.bottom: parent.bottom
+                width: parent.width
+                height: 1
+                color: "#333333"
+            }
+        }
+
+        contentItem: Column {
+            spacing: 12
+            topPadding: 20
+            bottomPadding: 20
+
+            TextField {
+                id: verName
+                x: 20
+                width: parent.width - 40
+                placeholderText: "Название версии"
+                color: "#ffffff"
+                placeholderTextColor: "#666666"
+                background: Rectangle {
+                    color: "#2a2a2a"
+                    radius: 6
+                    border.color: verName.activeFocus ? "#91B315" : "#444444"
+                    border.width: 1
+                }
+            }
+
+            TextField {
+                id: verServer
+                x: 20
+                width: parent.width - 40
+                placeholderText: "URL сервера загрузки"
+                color: "#ffffff"
+                placeholderTextColor: "#666666"
+                background: Rectangle {
+                    color: "#2a2a2a"
+                    radius: 6
+                    border.color: verServer.activeFocus ? "#91B315" : "#444444"
+                    border.width: 1
+                }
+            }
+        }
+
+        footer: Item {
+            implicitHeight: 60
+            Rectangle {
+                anchors.top: parent.top
+                width: parent.width
+                height: 1
+                color: "#333333"
+            }
+            Row {
+                anchors.centerIn: parent
+                spacing: 12
+
+                Button {
+                    text: "Отмена"
+                    width: 110; height: 36
+                    contentItem: Text {
+                        text: parent.text
+                        color: "#ffffff"
+                        horizontalAlignment: Text.AlignHCenter
+                        verticalAlignment: Text.AlignVCenter
+                    }
+                    background: Rectangle {
+                        color: parent.pressed ? "#444444" : "#333333"
+                        radius: 6
+                    }
+                    onClicked: addVersionDialog.reject()
+                }
+
+                Button {
+                    text: "Добавить"
+                    width: 110; height: 36
+                    contentItem: Text {
+                        text: parent.text
+                        color: "#ffffff"
+                        horizontalAlignment: Text.AlignHCenter
+                        verticalAlignment: Text.AlignVCenter
+                    }
+                    background: Rectangle {
+                        color: parent.pressed ? "#6a8510" : "#91B315"
+                        radius: 6
+                    }
+                    onClicked: addVersionDialog.accept()
+                }
+            }
+        }
+
+        onAccepted: {
+            const name = verName.text.trim()
+            if (name !== "") {
+                backend.addVersion(name, verServer.text.trim())
+                versionBox.currentIndex = backend.versionNames.length - 1
+            }
+            verName.text = ""; verServer.text = ""
+        }
+        onRejected: {
+            verName.text = ""; verServer.text = ""
+        }
+    }
 }
diff --git a/launcherbackend.cpp b/launcherbackend.cpp
new file mode 100644
index 0000000..def6a30
--- /dev/null
+++ b/launcherbackend.cpp
@@ -0,0 +1,114 @@
+#include "launcherbackend.h"
+
+#include <QDir>
+#include <QFile>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QStandardPaths>
+#include <algorithm>
+
+LauncherBackend::LauncherBackend(QObject *parent)
+    : QObject(parent)
+    , m_dataDir(QStandardPaths::writableLocation(QStandardPaths::AppDataLocation))
+{
+    QDir().mkpath(m_dataDir);
+    loadData();
+}
+
+QStringList LauncherBackend::profileNames() const
+{
+    QStringList names;
+    for (const auto &p : m_profiles)
+        names << p.name;
+    return names;
+}
+
+QStringList LauncherBackend::versionNames() const
+{
+    QStringList names;
+    for (const auto &v : m_versions)
+        names << v.name;
+    return names;
+}
+
+void LauncherBackend::addProfile(const QString &name, const QString &login, const QString &password)
+{
+    m_profiles.append({m_nextProfileId++, name, login, password});
+    saveProfiles();
+    emit profilesChanged();
+}
+
+void LauncherBackend::addVersion(const QString &name, const QString &serverUrl)
+{
+    m_versions.append({m_nextVersionId++, name, serverUrl});
+    saveVersions();
+    emit versionsChanged();
+}
+
+void LauncherBackend::launchGame(int profileIndex, int versionIndex)
+{
+    if (profileIndex < 0 || profileIndex >= m_profiles.size()) {
+        emit launchError("Выберите профиль перед запуском");
+        return;
+    }
+    if (versionIndex < 0 || versionIndex >= m_versions.size()) {
+        emit launchError("Выберите версию перед запуском");
+        return;
+    }
+
+    const auto &profile = m_profiles[profileIndex];
+    const auto &version = m_versions[versionIndex];
+    emit launched(profile.name, version.name, version.serverUrl);
+}
+
+void LauncherBackend::loadData()
+{
+    auto loadFile = [](const QString &path, auto handler) {
+        QFile f(path);
+        if (!f.open(QIODevice::ReadOnly))
+            return;
+        for (const auto &val : QJsonDocument::fromJson(f.readAll()).array())
+            handler(val.toObject());
+    };
+
+    loadFile(m_dataDir + "/profiles.json", [this](const QJsonObject &o) {
+        int id = o["id"].toInt();
+        m_profiles.append({id, o["name"].toString(), o["login"].toString(), o["password"].toString()});
+        if (id >= m_nextProfileId)
+            m_nextProfileId = id + 1;
+    });
+    std::sort(m_profiles.begin(), m_profiles.end(),
+              [](const Profile &a, const Profile &b) { return a.id < b.id; });
+
+    loadFile(m_dataDir + "/versions.json", [this](const QJsonObject &o) {
+        int id = o["id"].toInt();
+        m_versions.append({id, o["name"].toString(), o["serverUrl"].toString()});
+        if (id >= m_nextVersionId)
+            m_nextVersionId = id + 1;
+    });
+    std::sort(m_versions.begin(), m_versions.end(),
+              [](const Version &a, const Version &b) { return a.id < b.id; });
+}
+
+void LauncherBackend::saveProfiles()
+{
+    QJsonArray arr;
+    for (const auto &p : m_profiles)
+        arr.append(QJsonObject{{"id", p.id}, {"name", p.name}, {"login", p.login}, {"password", p.password}});
+
+    QFile f(m_dataDir + "/profiles.json");
+    if (f.open(QIODevice::WriteOnly))
+        f.write(QJsonDocument(arr).toJson());
+}
+
+void LauncherBackend::saveVersions()
+{
+    QJsonArray arr;
+    for (const auto &v : m_versions)
+        arr.append(QJsonObject{{"id", v.id}, {"name", v.name}, {"serverUrl", v.serverUrl}});
+
+    QFile f(m_dataDir + "/versions.json");
+    if (f.open(QIODevice::WriteOnly))
+        f.write(QJsonDocument(arr).toJson());
+}
diff --git a/launcherbackend.h b/launcherbackend.h
new file mode 100644
index 0000000..b8ad4e6
--- /dev/null
+++ b/launcherbackend.h
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <QObject>
+#include <QStringList>
+#include <QQmlEngine>
+
+class LauncherBackend : public QObject
+{
+    Q_OBJECT
+    QML_ELEMENT
+
+    Q_PROPERTY(QStringList profileNames READ profileNames NOTIFY profilesChanged)
+    Q_PROPERTY(QStringList versionNames READ versionNames NOTIFY versionsChanged)
+
+public:
+    explicit LauncherBackend(QObject *parent = nullptr);
+
+    QStringList profileNames() const;
+    QStringList versionNames() const;
+
+    Q_INVOKABLE void addProfile(const QString &name, const QString &login, const QString &password);
+    Q_INVOKABLE void addVersion(const QString &name, const QString &serverUrl);
+    Q_INVOKABLE void launchGame(int profileIndex, int versionIndex);
+
+signals:
+    void profilesChanged();
+    void versionsChanged();
+    void launched(const QString &profileName, const QString &versionName, const QString &serverUrl);
+    void launchError(const QString &message);
+
+private:
+    struct Profile { int id; QString name, login, password; };
+    struct Version { int id; QString name, serverUrl; };
+
+    void loadData();
+    void saveProfiles();
+    void saveVersions();
+
+    QList<Profile> m_profiles;
+    QList<Version> m_versions;
+    QString m_dataDir;
+    int m_nextProfileId = 1;
+    int m_nextVersionId = 1;
+};