lex justify-between items-center">
            <span class="text-2xl font-bold">GreenSe</span>
            <button id="menu-toggle" class="md:hidden focus:outline-none">
                <svg class="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16m-7 6h7"></path>
                </svg>
            </button>
            <ul id="menu" class="hidden md:fl