.hamburger_menu {
    width: 100%;
    height: 100%;
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;
    background: var(--blue);
}

.hamburger_menu .container {
    width: 90%;
    margin: auto;
    padding: 30px 0;
    margin-top: 100px;
}

.hamburger_menu .item {
    width: 80%;
    margin: auto;
    margin-top: 30px;
}

.hamburger_menu .item a.item_link {
    display: block;
    position: relative;
    padding: 8px 0;
}

.hamburger_menu .item a.item_link::before {
    position: absolute;
    content: "";
    width: 0;
    height: 1px;
    background: var(--white);
    transition: all 0.4s;
    left: 0;
    bottom: 0;
}

.hamburger_menu .item a.item_link:hover:before {
    width: 100%;
}

.hamburger_menu .item a.item_link.parent::after {
    position: absolute;
    content: "";
    width: 6px;
    height: 6px;
    border-right: 2px solid var(--white);
    border-bottom: 2px solid var(--white);
    top: 0;
    bottom: 0;
    right: 10px;
    margin: auto;
    transform: rotate(45deg);
    transition: all 0.2s;
}
.hamburger_menu .item a.item_link.parent.open::after {
    transform: rotate(-135deg);
}

.hamburger_menu .item .sub_box {
    margin-top: 15px;
    padding-left: 15px;
    display: none;
}

.hamburger_menu .item .sub_box a.sub_item_link {
    color: var(--white);
    padding: 10px 0;
    display: block;
    width: fit-content;
}

/* ============================================================================== */
/* responsive */
/* ============================================================================== */
@media screen and (max-width: 480px) {
    .hamburger_menu .container {
        margin-top: 60px;
    }

    .hamburger_menu .item {
        width: 90%;
        margin-top: 15px;
    }
}