nav.m_nav {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1040;
    overflow: hidden;
    transform: translateY(-100%);
    width: 100%;
    height: 100vh;
    transition: all 800ms cubic-bezier(.8, 0, .33, 1);
    border-radius: 0 0 50% 50%;
}

nav.m_nav.nav-open {
    transform: translateY(0);
    border-radius: 0% 0% 0% 0%;
    background: rgba(0, 0, 0, 0.87);
}

.menu-btn {
    position: fixed;
    top: 0;
    right: 10px;
    padding: 5px;
    cursor: pointer;
    z-index: 1050;
    color: #000;
}



.menu-btn .line {
    padding: 0;
    width: 24px;
    height: 3px;
    margin: 4px 0;
    border-radius: 3px;
    transition: all 700ms cubic-bezier(.9, 0, .33, 1);
}

.menu-btn .line.line--1 {
    width: 24px;
    transform: rotate(0) translateY(0);
}

.menu-btn .line.line--1.line-cross {
    width: 24px;
    transform: rotate(45deg) translateX(5px) translateY(5px);
    background-color: #ffffff !important;
}

.menu-btn .line.line--2 {
    width: 24px;
    transform: translateX(0);
}

.menu-btn .line.line--2.line-fade-out {
    width: 24px;
    transform: translate(24px);
    opacity: 0;
}

.menu-btn .line.line--3 {
    width: 24px;
    transform: rotate(0) translateY(0);
}

.menu-btn .line.line--3.line-cross {
    width: 24px;
    transform: rotate(-45deg) translateX(5px) translateY(-5px);
    background-color: #ffffff !important;
}


nav.m_nav .nav-links {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transform: translateY(0);
    opacity: 0;
    transition: all 900ms cubic-bezier(.9, 0, .33, 1);
}

nav.m_nav .nav-links ul {
    width: 100%;
}

nav.m_nav .nav-links.fade-in {
    opacity: 1;
    transform: translateY(0);
}


nav.m_nav .nav-links ul li .dd {
    display: none;
}

nav.m_nav .nav-links ul li:hover {
    background-color: rgba(0, 0, 0, 0.5);
}

nav.m_nav .nav-links ul li .active {
    background-color: var(--base_color);
}

nav.m_nav li dl dt span {
    cursor: pointer;
    transition: all 0.3s;
}

nav.m_nav li dl dt span.on {
    transform: rotate(180deg)
}


@media (max-width: 768px) {
    nav.m_nav .m-sub-nav-main {
        height: 100vh;
        overflow-y: scroll;
    }
}

@media (max-width: 320px) {
    nav.m_nav .nav-links {
        justify-content: start;
    }

}