header {
    height: 17.45vw;
    position: relative;
    display: flex;
    align-items: center;
}

header .logo {
    width: 31.5vw;
    height: 5.52vw;
    margin-right: 3.2vw;
}

.menu__mask {
    position: fixed;
    z-index: 50;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    display: none;
}

.menu {
    width: 41.15vw;
    height: 5.73vw;
    position: relative;
    z-index: 99;
}

.menu-list {
    width: 100%;
    height: 5.73vw;
    overflow: hidden;
}

.menu__item {
    width: 100%;
    height: 5.73vw;
    box-sizing: border-box;
    border: 0.5vw solid black;
    line-height: calc(5.73vw - 1vw);
    font-size: 3.13vw;
    font-family: Montserrat-Black;
    padding-left: 3.8vw;
    cursor: pointer;
    display: block;
    background: white;
}

.menu__item:visited,
.menu__item:link {
    color: black;
}

.menu__item:hover {
    color: rgba(0, 0, 0, .5);
}

.menu__item--active {
    color: rgba(0, 0, 0, .5) !important;
    cursor: unset;
}

.menu__item--lock {
    color: rgba(0, 0, 0, .5) !important;
    cursor: not-allowed;
}

.menu__item+.menu__item {
    border-top: none;
}

.menu-arrow {
    width: 5.73vw;
    height: 5.73vw;
    border: 0.5vw solid black;
    box-sizing: border-box;
    cursor: pointer;
    position: absolute;
    right: 0;
    top: 0;
}

.menu-arrow:active .menu-arrow__img {
    transform: translateY(0.2667vw);
}

.menu-arrow__img {
    width: 2.34vw;
    height: 1.56vw;
}

.lan {
    position: absolute;
    right: 36px;
    top: 1.61vw;
    width: 2.97vw;
    height: 2.97vw;
    background: black;
    color: white;
    border-radius: 50%;
    line-height: 2.97vw;
    text-align: center;
    font-size: 1.09vw;
    font-family: 'Noto Sans CJK SC', 'SimHei', 'STHeiti';
    font-weight: bold;
    cursor: pointer;
}