* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-size: 14px;
}

img {
    width: 100%;
}

header {
    width: 100%;
    height: 80px;
    display: grid;
    /*栅格布局*/
    grid-template-columns: 1fr 2fr;
    padding: 0 40px;
    /*上下为0 ，左右为40个像素*/
    align-items: center;
    position: relative;
    z-index: 200;
    background-color: #ffffff;
    box-sizing: border-box;
}

.logo {
    height: 80px;
    display: flex;
    align-items: center;
}

.logo_icon {
    width: 178px;
    height: 60px;
}

header nav {
    display: flex;
    align-items: center;
    justify-self: end;
    /*放置在最后边*/
}

header nav a {
    color: #333333;
    font-size: 16px;
    text-decoration: none;
    padding-bottom: 4px;
    margin: 0 24px;
    font-weight: 500;
}

header nav .active {
    color: #036FD4;
    border-bottom: 2px solid #036FD4;
}

header nav a:hover {
    color: #036FD4;
    border-bottom: 2px solid #036FD4;
}

header.burger {
    display: none;
}

header.sticky {
    position: fixed;
    background-color: white;
    box-shadow: 0 0 18px rgba(0, 0, 0, 0.1);
    animation: dropDown 0.5s ease-in-out forwards;
}
nav .lang .lang_item {
    cursor: pointer;
}
nav .lang .lang_item img{
    display: inline-block;
    width: 18px;
    height: 12px;
}

@keyframes dropDown {
    from {
        transform: translateY(-100px);
    }

    to {
        transform: translateY(0);
    }
}