nav {
    border-radius: 10px;
    background-color: var(--second-background-color);
    border: 1px solid var(--default-border-color);
    box-shadow: 0 0 10px #ccc;
    position: sticky;
    top: 0;
    z-index: 10;
}

.nav__box {
    display: flex;
    justify-content: space-evenly;
}

.nav-item {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.5vw;
    font-size: 1.4rem;
    padding: 1vw;
}

.nav-item__link {
    width: 100%;
    height: 100%;
}

.nav-item__box {
    width: 100%;

}

.nav-item:hover {
    cursor: pointer;
}

.nav-item__arrow {
    height: 1rem;
    width: 2rem;
}


/* plank */

.nav-item-plank {
    background-color: var(--grey);
    width: 20px;
    height: 4px;
    border-radius: 10px;
    position: relative;
    
}

.nav-item:hover .nav-item-plank {
    visibility: hidden;
}


/* submenu */

.nav__submenu {
    max-width: 20vw;
    background-color: var(--white);
    border: 1px solid var(--grey);
    border-radius: 10px;
    position: absolute;
    top: 4vw;
    transition: all 0.5s ease;
    display: none;
}

.nav-item:hover .nav__submenu {
    display: block;
}

.nav__burger {
    display: none;
}

.burger__bar1,
.burger__bar2,
.burger__bar3 {
    border-radius: 10px;
    width: 20px;
    height: 2px;
    background-color: var(--grey);
    margin: 4px 0;
    transition: 0.5s;
}

.burger__bar_change .burger__bar1 {
    transform: rotate(-45deg) translate(-0.2px, 8px);
}

.burger__bar_change .burger__bar2 {
    opacity: 0;
}

.burger__bar_change .burger__bar3 {
    transform: rotate(45deg) translate(-0.2px, -8px);
}

@media screen and (max-width: 768px) {
    .nav__box {
        flex-direction: column;
        display: none;
        transition: all 0.5s linear;
    }
    .nav__submenu {
        position: inherit;
    }
    .nav-item {
        width: 100%;
    }
    .nav__box.nav__box_open {
        display: flex;
    }
    .nav__burger {
        display: block;
        width: 20px;
        cursor: pointer;
        margin: 2vw;
    }
}