I'm working on a klondike solitaire game and I created a menu that is displayed on the top of the page. On laptops and computers I want to look like regular menus, considering many players are used to such menus, but on mobile devices, I wanted the menu items to be easy to click.

<div class="menu-bar" id="menuBar"></div>

Here is the css style for the regular menu:

        body {
            padding: 0;
            margin: 0;
        }

        /* Basic menu styling for desktop */
        .menu-bar {
            display: flex;
            background-color: #333;
            padding: 10px;
            justify-content: flex-start;
            /* Align menu items to the left */

            font-family: Arial, Helvetica, sans-serif
        }

        .menu-item {
            color: white;
            padding: 10px;
            cursor: pointer;
            position: relative;
            text-align: center;
            flex: 0;
            display: flex;
            /* Align icon and text on the same line */
            align-items: center;
            justify-content: center;
            white-space: nowrap;
        }

        .menu-item {
            text-align: left;
        }

        .menu-item i {
            font-size: 1.5rem;
            margin-right: 8px;
            /* Space between icon and text */
        }

        .menu-item .shortcut,
        .submenu-item .shortcut {
            color: #999;
        }

        .menu-item .shortcut {
            display: none;
            /* too ugly on main items */
        }


        .submenu {
            display: none;
            position: absolute;
            background-color: #444;
            top: 40px;
            left: 0;
            width: 150px;
        }

        .submenu-item {
            padding: 10px;
            color: white;
        }

        .submenu-item:hover {
            background-color: #666;
        }

        .menu-item.active .submenu {
            display: block;
        }

To make the menu act differently on mobile devices we are going to use media queries:

        /* Mobile styles */
        @media (max-width: 768px) {
            .menu-bar {
                flex-direction: column;
                position: relative;
                display: grid;
                /* Grid layout for mobile */
                grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
                /* Evenly divide menu items into columns */
                gap: 10px;
            }

            .menu-item {
                padding: 15px 5px;
                display: block;
                /* Stack icon and text vertically on mobile */
                white-space: normal;
            }

            .menu-item {
                text-align: center;
            }

            .menu-item i {
                font-size: 2rem;
                /* Larger icon for mobile */
                margin-right: 0;
                /* Remove margin on mobile */
                display: block;
                /* Icon on a separate line */
                text-align: center;
            }

            .menu-item .shortcut {
                display: none;
                /* Hide shortcuts on mobile */
            }

            .submenu {
                position: static;
                display: none;
                width: 100%;
                background-color: #333;
                top: 0;
                left: 0;
                z-index: 10;
            }

            .menu-item.active .submenu {
                display: block;
            }

            .menu-bar.active .menu-item {
                display: none;
            }

            .menu-bar.active .menu-item.active {
                display: block;
            }

            .submenu .close-btn {
                color: white;
                padding: 10px;
                cursor: pointer;
                text-align: center;
                background-color: #444;
            }

            .submenu .close-btn:hover {
                background-color: #666;
            }
        }

and finally the javascript:

        const menuData = [
            {
                icon: "fa-solid fa-gamepad", // Icon for "New Game..."
                icon_text: "?", // Emoji for game controller
                name: "New Game...",
                shortcut: "",
                submenu: {
                    items: [
                        {
                            name: "Restart",
                            icon: "fa-solid fa-undo-alt", // Icon for "Restart"
                            icon_text: "?", // Emoji for restart
                            shortcut: "Ctrl+N"
                        },
                        {
                            name: "Start New",
                            icon: "fa-solid fa-play-circle", // Icon for "Start New"
                            icon_text: "??", // Emoji for start/play
                            shortcut: ""
                        }
                    ]
                }
            },
            {
                icon: "fa-solid fa-cog", // Icon for "Settings..."
                name: "Settings...",
                icon_text: "??", // Emoji for settings
                shortcut: "Ctrl+S",
                submenu: null
            },
            {
                icon: "fa-solid fa-th-large", // Icon for "More Solitaire..."
                icon_text: "?", // Emoji for cards/games
                name: "More Solitaire...",
                shortcut: "Ctrl+P",
                submenu: null
            }
        ];



        function createMenu(menuData) {
            const mode = "emoji";
            const menuBar = document.getElementById('menuBar');

            menuData.forEach(item => {
                const menuItem = document.createElement('div');
                menuItem.classList.add('menu-item');

                // Add icon
                const icon = document.createElement('i');
                (mode === "emoji")
                    ? (icon.innerText = item.icon_text, icon.style["font-style"] = "normal")
                    : icon.className = item.icon;
                menuItem.appendChild(icon);

                // Add name
                const name = document.createElement('div');
                name.textContent = item.name;
                menuItem.appendChild(name);

                // Add shortcut if available
                if (item.shortcut) {
                    const shortcut = document.createElement('span');
                    shortcut.classList.add('shortcut');
                    shortcut.textContent = ` (${item.shortcut})`;
                    menuItem.appendChild(shortcut);
                }

                // Check for submenu
                if (item.submenu) {
                    const submenu = document.createElement('div');
                    submenu.classList.add('submenu');

                    item.submenu.items.forEach(subItem => {
                        const submenuItem = document.createElement('div');
                        submenuItem.classList.add('submenu-item');

                        // Submenu item icon
                        const subIcon = document.createElement('i');
                        (mode === "emoji")
                            ? (subIcon.innerText = subItem.icon_text, subIcon.style["font-style"] = "normal")
                            : subIcon.className = subItem.icon;
                        submenuItem.appendChild(subIcon);

                        // Submenu item name
                        const subName = document.createTextNode(` ${subItem.name}`);
                        submenuItem.appendChild(subName);

                        // Submenu item shortcut
                        if (subItem.shortcut) {
                            const subShortcut = document.createElement('span');
                            subShortcut.classList.add('shortcut');
                            subShortcut.textContent = ` (${subItem.shortcut})`;
                            submenuItem.appendChild(subShortcut);
                        }

                        submenu.appendChild(submenuItem);
                    });

                    // Add a close button at the end of the submenu for mobile
                    const closeButton = document.createElement('div');
                    closeButton.classList.add('submenu-item'); // Make it look like other submenu items

                    // Add the chevron icon
                    const closeIcon = document.createElement('i');
                    (mode === "emoji")
                        ? (closeIcon.innerText = '??', closeIcon.style["font-style"] = "normal")
                        : closeIcon.className = 'fa-solid fa-chevron-up';
                    closeButton.appendChild(closeIcon);

                    // Add the "Close" text
                    const closeText = document.createTextNode(' Close');
                    closeButton.appendChild(closeText);

                    closeButton.addEventListener('click', function (event) {
                        event.stopPropagation(); // Prevent the click from propagating to the parent .menu-item
                        menuItem.classList.remove('active'); // Close the submenu
                    });
                    submenu.appendChild(closeButton);

                    menuItem.appendChild(submenu);

                    // Add event listener for clicking to show/hide submenu
                    menuItem.addEventListener('click', function (event) {
                        event.stopPropagation(); // Prevent closing when clicking inside the menu
                        const allMenuItems = document.querySelectorAll('.menu-item');

                        if (window.innerWidth <= 768) {
                            allMenuItems.forEach(item => item.classList.remove('active')); // Close all
                            menuItem.classList.add('active'); // Open clicked one
                        } else {
                            menuItem.classList.toggle('active'); // Toggle submenu on desktop
                        }
                    });

                    // Close the submenu when clicking outside of the menu
                    document.addEventListener('click', function (event) {
                        const allMenuItems = document.querySelectorAll('.menu-item');

                        allMenuItems.forEach(menuItem => {
                            if (!menuItem.contains(event.target)) {
                                menuItem.classList.remove('active'); // Close the submenu if clicked outside
                            }
                        });
                    });
                }




                menuBar.appendChild(menuItem);
            });
        }

        // Initialize the menu
        createMenu(menuData);

        // Add resize event listener to handle dynamic resizing
        window.addEventListener('resize', function () {
            const menuBar = document.getElementById('menuBar');
            if (window.innerWidth > 768) {
                // On desktop, ensure that all submenus are collapsed by default
                const allMenuItems = document.querySelectorAll('.menu-item');
                allMenuItems.forEach(item => item.classList.remove('active'));
            }
        });

You can play with the code here:
https://codepen.io/quantotius/pen/KKOWjyd

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