.custom-menu ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.custom-menu li {
    position: relative;
}

.custom-menu li ul {
    display: none;
    padding-left: 0;
    margin: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    max-height: 0;
}

.custom-menu a {
    display: block;
    padding: 4px 10px;
    text-decoration: none;
    background: transparent;
    color: white;
    font-size: 18px;
    font-weight: 800;
    line-height: 24px;
    transition: color 0.3s ease;
}

.custom-menu a:hover {
    color: rgba(255, 255, 255, 0.8);
}

.custom-menu li.open > a {
    color: rgba(255, 255, 255, 0.8);
}

.custom-menu li.open > ul {
    display: block;
    max-height: 1000px;
}

.custom-menu ul ul {
    padding-left: 20px;
}

.custom-menu .toggle-arrow {
    display: inline-block;
    width: 12px;
    height: 12px;
    margin-right: 8px;
    cursor: pointer;
    background: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTQiIGhlaWdodD0iMTQiIHZpZXdCb3g9IjAgMCAxNCAxNCIgZmlsbD0ibm9uZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4KPHBhdGggZD0iTTEuMjE0NDQgNS42NDMyNEwxLjg5NzQ2IDUuMDEwMzNMNi4yMjg0IDEwLjQ2MTdMNi45MjIyNiA5LjgzOTIzTDEyLjMwMzkgNS4wMTAzM0wxMS42MjAyIDQuMzYwNzFMNi45MjIyNiA5LjAyNzU0TDEuMjE0NDQgNC4zNjA3MUwwLjUzMTQxNyA1LjAxMDMzTDEuMjE0NDQgNS42NDMyNFoiIGZpbGw9IndoaXRlIiBzdHJva2U9IndoaXRlIiBzdHJva2Utd2lkdGg9IjEuNiIvPgo8L3N2Zz4=') no-repeat center center;
    background-size: contain;
    transition: transform 0.3s ease;
    position: absolute;
    left: -8px;
    top: 11px;
}

.custom-menu li.open > .toggle-arrow {
    transform: rotate(180deg);
}

.custom-menu li ul {
    display: block;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    max-height: 0;
}