.yichen_foot {
    padding: 44px 0 0;
}

.yichen_foot .container {
    display: flex;
    justify-content: space-between;
}

.yichen_foot .yichen_foot_info {
    width: 30%;
}

.yichen_foot .yichen_foot_info .yichen_foot_info_logo img {
    height: 77px;
    width: auto;
    object-fit: cover;
    margin-left: 8px;
    margin-bottom: 10px;
}

.yichen_foot .yichen_foot_info_contact_item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #545353;
    font-size: 16px;
    font-weight: 400;
    line-height: 30px;
}

.yichen_foot .yichen_foot_info_contact_item:first-child {
    align-items: flex-start;
}

.yichen_foot .yichen_foot_info_contact_item:first-child img {
    margin-top: 8px;
}

.yichen_foot .yichen_foot_info_contact_item img {
    width: 14px;
    height: fit-content;
    object-fit: cover;
}

.yichen_foot .yichen_foot_nav {
    width: 65%;
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-top: 52px;
}

.yichen_foot .yichen_foot_nav .yichen_foot_nav_item h3 {
    color: #545353;
    font-size: 18px;
    font-weight: 500;
    line-height: 1.25;
    margin-bottom: 15px;
}

.yichen_foot .yichen_foot_nav .yichen_foot_nav_item ul li,
.yichen_foot .yichen_foot_nav .yichen_foot_nav_item ul li a {
    color: #545353;
    font-size: 16px;
    font-weight: 300;
    line-height: 30px;
}

.yichen_foot_copyright {
    border-top: 1px solid #E5E5E5;
    padding: 16px 0;
    margin-top: 20px;
}

.yichen_foot_copyright p {
    display: inline-block;
    color: #545353;
    font-size: var(--text-size);
    font-weight: 500;
    line-height: 20px;
    margin: 0 auto;
}

@media screen and (max-width: 992px) {
    .yichen_foot .yichen_foot_nav {
        width: fit-content;
    }
}

@media screen and (max-width: 768px) {
    .yichen_foot .container {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }

    .yichen_foot .yichen_foot_nav {
        flex-direction: column;
        gap: 20px;
    }

    .yichen_foot .yichen_foot_info_logo {
        text-align: center;
    }

    .yichen_foot .yichen_foot_nav,
    .yichen_foot .yichen_foot_info {
        width: 100%;
    }

    .yichen_foot_nav_item ul {
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        transform: translateY(-10px);
        transition: max-height 0.4s ease-in-out, opacity 0.3s ease-in-out, transform 0.3s ease-in-out;
    }

    .yichen_foot_nav_item ul.active {
        max-height: 500px;
        opacity: 1;
        transform: translateY(0);
    }

    .yichen_foot_nav_item h3 {
        position: relative;
    }

    .yichen_foot_nav_item h3::after {
        content: '\e643';
        font-family: 'iconfont';
        font-size: 12px;
        position: absolute;
        right: 0;
        top: 50%;
        transform: translateY(-50%) rotate(0deg);
        transition: transform 0.3s ease-in-out;
    }

    .yichen_foot_nav_item.active h3::after {
        transform: translateY(-50%) rotate(180deg);
    }

    .yichen_foot .yichen_foot_nav {
        margin-top: 20px;
    }

    .yichen_foot .yichen_foot_nav .yichen_foot_nav_item h3 {
        margin-bottom: 10px;
    }
}