*{
    box-sizing: border-box;
}
.research {
    width: 100%;
    margin: 0 auto;
}
.research-institute {
    width: 1200px;
    padding: 80px 20px;
    overflow: hidden;
    margin: 0 auto;
}
.research-institute h3, .research-step h3, .direction h3 {
    font-size: 20px;
    text-align: center;
    line-height: 40px;
}
.research-content {
    width: 100%;
    position: relative;
    margin-top: 20px;
    /* overflow: hidden; */
    display: flex;
    align-items: center;
}
.research-img {
    width: 480px;
    height: auto;
}
.research-img img {
    display: block;
    width: 100%;
    height: 100%;
    min-width: 100%;
    height: 100%;
}
.research-item {
    width: 688px;
    height: auto;
    box-shadow: 0px 0px 10px 4px rgb(9 25 26 / 10%);
    line-height: 46px;
    padding: 25px 36px;
    margin-left: -20px;
    z-index: 10;
    background-color: #fff;
    margin-top: -10px;
}
.research-step, .direction {
    width: 100%;
    overflow: hidden;
    padding: 80px 0;
}
.step-method, .direction-content {
    width: 1200px;
    margin: 48px auto 0;
    overflow: hidden;
    padding: 0 20px;
}
.step-method ul li {
    float: left;
    text-align: center;
    display: block;
}
.step-method-item {
    width: 20%;
    font-size: 15px;
    background-color: #fff;
    border-radius: 5px;
    padding: 30px 0;
    box-shadow: 0px 0px 10px 4px rgb(9 25 26 / 10%);
}
.step-method-item span::before {
    content: attr(data-index);
    position: absolute;
    line-height: 30px;
    font-size: 16px;
    color: #1b90fd;
    text-align: center;
    margin: 20px 0 18px -14px;
}
.step-method-item img {
    height:115px; 
}
.step-method-item h4 {
    display: block;
    margin-top: 60px;
    line-height: 40px;
}
.arrowhead {
    width: 4%;
    margin: 125px 10px;
}
.arrowhead img {
    width: 50px;
}
.direction-left, .direction-right {
    width: 50%;
}
.direction-left {
    line-height: 40px;
    float: left;
    position: relative;
}
.direction-left img {
    position: relative;
    float: left;
    width: 80%;
    margin-left: 40px;
}
.direction-left p{
    position: absolute;
    padding: 60px;
    margin-top: 30px;
}
.direction-right {
    padding-left: 30px;
}
.direction-right ul li {
    float: left;
    display: block;
    width: 110px;
    height: 110px;
    box-shadow: 0px 0px 10px 4px rgb(9 25 26 / 10%);
    text-align: center;
    margin-top: 30px;
    padding: 10px;
    margin-left: 48px;
    line-height: 24px;
}
.direction-right ul li img {
    width: 65%;
    margin-top: 5px;
}
/* 底部 */
.foot {
    width: 100%;
    background: #0e1421;
    padding: 80px 0 0;
}
.footer {
    width: 1200px;
    margin: 0 auto;
    font-size: 12px;
    color: #fff;
    padding: 0 20px;
}
.foot-logo {
    width: 100%;
    height: 66px;
    border-bottom: 1px solid hsla(0,0%,100%,.22);
}
.foot-content {
    width: 100%;
    /* height: 310px; */
    margin-top: 20px;
    display: flex;
    justify-content: space-between;
}
.foot-inner {
    display: flex;
    flex-direction: column;
}
.news-header {
    width: 280px;
    display: flex;
    justify-content: space-between; 
}
.news-kind {
    margin-top: 8px;
    font-size: 14px;

}
.news-letter {
    margin-top: 10px;
    cursor: pointer;
}
.news-link {
    width: 280px;
    margin-top: 24px;
    overflow: hidden;
    line-height: 24px;
}
.news-item {
    width: 100%;
    display: block;
    height: 54px;
    position: relative;
    border-bottom: 1px solid hsla(0,0%,100%,.22);
    margin-top: 4px;
}
.news-item div {
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.news-item p {
    color: #888;
}
.news-coad {
    margin-top: 20px;
    margin-left: -5px;
}
.news-coads {
    width: 112px;
    overflow: hidden;
    text-align: center;
}
.link {
    margin-top: 24px;
    width: 120px;
}
.link a {
    display: block;
    color: #fff;
    line-height: 36px;
}
.events {
    width: 240px;
    overflow: hidden;
    margin-top: 24px;
}
.events label {
    width: 100%;
    line-height: 36px;
}
.events input, .events textarea {
    width: 100%;
    outline: none;
}
.events input {
    height: 30px;
}
.events div{
    width: 94px;
    height: 30px;
    color: #fff;
    background: #888;
    cursor: pointer;
    text-align: center;
    line-height: 30px;
    margin-top: 12px;
}
.foot-line {
    width: 100%;
    height: 1px;
    background-color: hsla(0,0%,100%,.22);
    margin-top: 40px;
}
.foot-end {
    width: 100%;
    text-align: center;
    line-height: 80px;
}

/* mobile */
@media screen and (min-width: 960px) and (max-width: 1200px) {
    .research-institute {
        width: 960px;
    }
    .research-img {
        width: 430px;
    }
    .research-item {
        width: 530px;
        padding: 20px 25px;
        line-height: 36px;
    }
    .step-method, .direction-content {
        width: 960px;
    }
    .direction-content  {
        height: 300px;
    }
    .arrowhead img {
        width: 36px;
    }
    .step-method-item img {
        height: 96px;
    }
    .step-method-item h4 {
        font-size: 13px;
    }
    .direction-right ul li {
        margin-left: 24px;
    }
    .direction-left p {
        margin-top: -20px;
    }
    .footer {
        width: 900px
    }
    .link {
        width: 90px;
    }
    .events {
        width: 220px;
    }
}
@media screen and (min-width: 768px) and (max-width: 959px) {
    .research-institute {
        width: 768px;
    }
    .research-img {
        width: 368px;
    }
    .research-item {
        width: 400px;
        line-height: 28px;
        padding: 10px 13px;
    }
    .step-method, .direction-content {
        width: 768px;
    }
    .arrowhead {
        margin: 125px 5px;
    }
    .arrowhead img {
        width: 24px;
    }
    .step-method-item h4 {
        font-size: 12px;
    }
    .step-method-item img {
        height: 75px;
    }
    .step-method-item h4 {
        margin-top: 50px;
    }
    .step-method-item {
        padding: 20px 0;
    }
    .direction-content  {
        height: 440px;
    }
    .foot {
        padding: 30px 0 20px;
    }
    .footer {
        width: 100%;
    }
    .foot-content {
        display: none;
    }
    .foot-line {
        display: none;
    }
    .foot-end {
        line-height: 20px;
        margin-top: 18px;
    }
    .foot-logo {
        text-align: center;
    }
}
@media only screen and (min-width: 480px) and (max-width: 767px) {
    .research-institute{
        width: 480px;
    }
    .research-content {
        display: block;
    }
    .research-img {
        width: 100%;
    }
    .research-item {
        width: 100%;
        line-height: 36px;
    }
    .step-method, .direction-content {
        width: 480px;
    }
    .arrowheadtwo {
        display: none !important;
    }
    .step-method-item{
        width: 41%;
    }
    .arrowhead img {
        width: 24px;
    }
    .step-method-item {
        margin-top: 25px;
    }
    .arrowhead {
        width: auto;
    }
    .step-method-item img{
        height: 87px;
    }
    .direction-left p{
        padding: 0;
        margin-top: 0;
    }
    .direction-left, .direction-right {
        width: 100%;
    }
    .direction-right ul li {
        margin-left: 32px;
    }
    .direction-right {
        padding-left: 0;
        margin: 15px 0;
    }
    .foot {
        padding: 30px 0 20px;
    }
    .footer {
        width: 100%;
    }
    .foot-content {
        display: none;
    }
    .foot-line {
        display: none;
    }
    .foot-end {
        line-height: 20px;
        margin-top: 18px;
    }
    .foot-logo {
        text-align: center;
    }
}
@media only screen and (max-width: 479px) {
    .research-institute{
        width:100%;
    }
    .research-content {
        display: block;
    }
    .research-img {
        width: 100%;
    }
    .research-item {
        width: 100%;
        line-height: 36px;
    }
    .step-method, .direction-content {
        width: 100%;
    }
    .arrowheadtwo {
        display: none !important;
    }
    .step-method-item{
        width: 41%;
    }
    .arrowhead img {
        width: 24px;
    }
    .step-method-item h4 {
        font-size: 12px;
    }
    .step-method-item {
        margin-top: 25px;
    }
    .arrowhead {
        width: auto;
    }
    .step-method-item img{
        height: 87px;
    }
    .direction-left p{
        position: relative;
        padding: 0;
        margin-top: 0;
    }
    .direction-left, .direction-right {
        width: 100%;
    }
    .direction-left img {
        display: none;
    }
    .direction-right ul li {
        margin-left: 32px;
    }
    .direction-right {
        padding-left: 0;
        margin: 15px 0;
    }
    .foot {
        padding: 30px 0 20px;
    }
    .footer {
        width: 100%;
    }
    .foot-content {
        display: none;
    }
    .foot-line {
        display: none;
    }
    .foot-end {
        line-height: 20px;
        margin-top: 18px;
    }
    .foot-logo {
        text-align: center;
    }
}