Browser.java

import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.value.ChangeListener;
import javafx.concurrent.Worker;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.Tab;
import javafx.scene.control.TabPane;
import javafx.scene.control.TextField;
import javafx.scene.control.ToolBar;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;

public class Browser extends Application {
    private static final String HOME_URL = "https://www.google.com/?hl=en";
    private static final String TITLE = "SimpleJBrowser";

    private TextField addressBar;
    private Label tabCountLabel;
    private TabPane tabs;
    private Label splash;
    private StackPane stackPane;

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle(TITLE);
        primaryStage.setWidth(1400);
        primaryStage.setHeight(900);

        addressBar = new TextField();
        addressBar.setPromptText("Search or enter address");
        addressBar.setOnAction(event -> navigate());
        addressBar.setStyle("-fx-font-family: 'Adwaita Sans', 'Helvetica Neue', Arial, sans-serif; " +
                "-fx-font-size: 13px; " +
                "-fx-padding: 8px 14px; " +
                "-fx-border-color: #4e5d7a; " +
                "-fx-border-radius: 18px; " +
                "-fx-background-color: #202832; " +
                "-fx-text-fill: #f2f5fa; " +
                "-fx-background-radius: 18px;");

        tabs = new TabPane();
        tabs.setTabClosingPolicy(TabPane.TabClosingPolicy.SELECTED_TAB);
        tabs.getSelectionModel().selectedItemProperty().addListener((observable, oldTab, newTab) -> tabChanged(newTab));

        tabCountLabel = new Label("1 tab");
        tabCountLabel.setTextFill(Color.web("#a8b7d0"));
        tabCountLabel.setStyle("-fx-font-size: 12px; -fx-padding: 0 0 0 12px;");

        Button backButton = createToolButton("◀", event -> navigateBack());
        Button forwardButton = createToolButton("▶", event -> navigateForward());
        Button reloadButton = createToolButton("↻", event -> navigateReload());
        Button homeButton = createToolButton("⌂", event -> navigateHome());
        homeButton.setMinSize(44, 44);
        homeButton.setStyle("-fx-background-color: #3b4b66; -fx-text-fill: #ffffff; -fx-font-weight: bold; -fx-font-size: 18px; " +
                "-fx-background-radius: 22px; -fx-border-radius: 22px;");
        Button newTabButton = createToolButton("+", event -> addNewTab(HOME_URL));
        newTabButton.setTooltip(new javafx.scene.control.Tooltip("Open a new tab"));

        ToolBar toolbar = new ToolBar(backButton, forwardButton, reloadButton, homeButton, newTabButton, tabCountLabel, addressBar);
        toolbar.setStyle("-fx-background-color: #171f2b; -fx-border-color: transparent transparent #2f3e53 transparent; -fx-padding: 8px;");

        addNewTab(HOME_URL);

        BorderPane layout = new BorderPane();
        layout.setTop(toolbar);
        layout.setCenter(tabs);

        splash = new Label("Loading SimpleBrowser...");
        splash.setTextFill(Color.web("#e5ecff"));
        splash.setStyle("-fx-background-color: #0f1620; -fx-font-family: sans-serif; -fx-font-size: 18px; " +
                "-fx-alignment: center;");
        splash.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
        splash.setAlignment(Pos.CENTER);

        stackPane = new StackPane(layout, splash);
        StackPane.setAlignment(splash, Pos.CENTER);

        Scene scene = new Scene(stackPane);
        scene.setFill(Color.web("#0f1620"));

        primaryStage.setScene(scene);
        primaryStage.setTitle(TITLE);
        primaryStage.show();

        showSplash(true);
    }

    private Button createToolButton(String text, javafx.event.EventHandler<javafx.event.ActionEvent> handler) {
        Button button = new Button(text);
        button.setOnAction(handler);
        button.setMinSize(30, 30);
        button.setStyle("-fx-background-color: #2a3240; -fx-text-fill: #e5ecff; -fx-font-weight: bold; -fx-background-radius: 15px; " +
                "-fx-border-radius: 15px; -fx-border-color: transparent;");
        button.setOnMouseEntered(event -> button.setStyle("-fx-background-color: #3c4e6c; -fx-text-fill: #e5ecff; -fx-font-weight: bold; -fx-background-radius: 15px; " +
                "-fx-border-radius: 15px; -fx-border-color: transparent;"));
        button.setOnMouseExited(event -> button.setStyle("-fx-background-color: #2a3240; -fx-text-fill: #e5ecff; -fx-font-weight: bold; -fx-background-radius: 15px; " +
                "-fx-border-radius: 15px; -fx-border-color: transparent;"));
        return button;
    }

    private void addNewTab(String url) {
        WebView view = new WebView();
        view.setStyle("-fx-background-color: #0f1620;");
        WebEngine engine = view.getEngine();

        Tab tab = new Tab("New Tab", view);
        tab.setOnClosed(event -> updateTabCount());
        tabs.getTabs().add(tab);
        tabs.getSelectionModel().select(tab);

        engine.locationProperty().addListener((observable, oldValue, newValue) -> {
            if (tab.equals(getCurrentTab())) {
                addressBar.setText(newValue);
            }
        });

        engine.titleProperty().addListener((observable, oldValue, newValue) -> {
            tab.setText((newValue == null || newValue.isEmpty()) ? "New Tab" : newValue);
            if (tab.equals(getCurrentTab())) {
                Stage stage = (Stage) stackPane.getScene().getWindow();
                stage.setTitle((newValue == null || newValue.isEmpty()) ? TITLE : newValue + " - " + TITLE);
            }
        });

        engine.getLoadWorker().stateProperty().addListener((observable, oldState, newState) -> {
            if (newState == Worker.State.SUCCEEDED && tab.equals(getCurrentTab())) {
                showSplash(false);
            }
        });

        updateTabCount();
        platformLoadUrl(engine, url);
    }

    private void tabChanged(Tab newTab) {
        if (newTab == null) {
            return;
        }

        WebView view = (WebView) newTab.getContent();
        WebEngine engine = view.getEngine();
        addressBar.setText(engine.getLocation());
        String title = engine.getTitle();
        Stage stage = (Stage) stackPane.getScene().getWindow();
        stage.setTitle((title == null || title.isEmpty()) ? TITLE : title + " - " + TITLE);

        if (engine.getLoadWorker().getState() != Worker.State.SUCCEEDED) {
            showSplash(true);
        } else {
            showSplash(false);
        }
    }

    private Tab getCurrentTab() {
        return tabs.getSelectionModel().getSelectedItem();
    }

    private WebEngine getCurrentEngine() {
        Tab currentTab = getCurrentTab();
        if (currentTab == null) {
            return null;
        }
        WebView view = (WebView) currentTab.getContent();
        return view.getEngine();
    }

    private void navigateBack() {
        WebEngine engine = getCurrentEngine();
        if (engine != null && engine.getHistory().getCurrentIndex() > 0) {
            engine.getHistory().go(-1);
        }
    }

    private void navigateForward() {
        WebEngine engine = getCurrentEngine();
        if (engine != null && engine.getHistory().getCurrentIndex() < engine.getHistory().getEntries().size() - 1) {
            engine.getHistory().go(1);
        }
    }

    private void navigateReload() {
        WebEngine engine = getCurrentEngine();
        if (engine != null) {
            engine.reload();
        }
    }

    private void navigateHome() {
        WebEngine engine = getCurrentEngine();
        if (engine != null) {
            platformLoadUrl(engine, HOME_URL);
        }
    }

    private void navigate() {
        String url = addressBar.getText().trim();
        if (url.isEmpty()) {
            return;
        }
        if (!url.contains("://")) {
            url = "https://" + url;
        }
        if (url.startsWith("http://") && !warnInsecure(url)) {
            return;
        }
        WebEngine engine = getCurrentEngine();
        if (engine != null) {
            platformLoadUrl(engine, url);
        }
    }

    private boolean warnInsecure(String url) {
        Alert alert = new Alert(Alert.AlertType.WARNING);
        alert.setTitle("Insecure Connection");
        alert.setHeaderText("You are navigating to an insecure HTTP site.");
        alert.setContentText("Data sent or received on this page is not encrypted. Proceed only if you trust the site.");
        alert.getButtonTypes().setAll(javafx.scene.control.ButtonType.OK, javafx.scene.control.ButtonType.CANCEL);
        return alert.showAndWait().filter(response -> response == javafx.scene.control.ButtonType.OK).isPresent();
    }

    private void updateTabCount() {
        int count = tabs.getTabs().size();
        tabCountLabel.setText(count + " tab" + (count == 1 ? "" : "s"));
    }

    private void showSplash(boolean visible) {
        splash.setVisible(visible);
        splash.setManaged(visible);
    }

    private void platformLoadUrl(WebEngine engine, String url) {
        Platform.runLater(() -> engine.load(url));
    }
}