.dropdown-menu {
    margin: 0;
    padding: 0.5rem 0;
    border: none;
    border-radius: 0;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.dropdown-submenu {
    position: relative;
}

.dropdown-submenu > .dropdown-menu {
    top: 0;
    left: 100%;
    margin-top: -0.5rem;
    border-radius: 0;
}

.dropdown-submenu:hover > .dropdown-menu,
.dropdown-submenu:focus-within > .dropdown-menu {
    display: block;
}

.dropdown-item {
    padding: 0.5rem 1.5rem;
}

.dropdown-submenu > a::after {
    display: inline-block;
    margin-left: 0.5rem;
    vertical-align: middle;
    content: "";
    border-top: 0.3em solid transparent;
    border-right: 0;
    border-bottom: 0.3em solid transparent;
    border-left: 0.3em solid;
    float: right;
    margin-top: 0.5rem;
}

/* Mobile styles */
@media (max-width: 991.98px) {
    .dropdown-menu {
        border: none;
        padding-left: 1.5rem;
        box-shadow: none;
    }

    .dropdown-submenu > .dropdown-menu {
        left: 0;
        padding-left: 1rem;
        border-left: 2px solid rgba(0, 0, 0, 0.1);
    }

    .dropdown-submenu > a::after {
        transform: rotate(90deg);
        float: right;
        margin-top: 0.5rem;
    }

    .dropdown-submenu.show > a::after {
        transform: rotate(-90deg);
    }
}