body {
    font-family: "Microsoft Yahei";
    position: relative;
}

body,
ul {
    margin: 0;
    padding: 0;
}

.s-nav {
    background-color: #fff;
    margin-bottom: 0;
    position: fixed;
    z-index: 3;
    width: 100%;
}

.s-nav #s-nav {
    padding-top: 15px;
}

.s-nav .container-fluid {
    height: 69px;
}

.s-nav .navbar-brand {
    padding: 0 15px;
}

.s-nav li {
    width: 100px;
}

.s-nav li a {
    text-align: center;
    padding: 15px 20px;
    transition: all 2s;
}

.s-nav li:nth-child(5) {
    width: 112px;
}

.s-nav li:nth-child(6) {
    width: 133px;
}

.s-nav .dropdown-menu {
    min-width: 100px;
}

.banner {
    width: 100%;
    position: fixed;
    top: 67px;
    z-index: 1;
    text-align: center;
    background-color: #000;
}

.banner .b_img {
    height: 600px;
}

.tomargin {
    width: 100%;
    background-color: #fff;
    position: relative;
    z-index: 2;
    overflow: hidden;
}

.main {
    width: 75%;
    margin-top: 75px;
    padding-bottom: 50px;
}

.main .s-h1 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 25px;
    font-family: "Microsoft Yahei";
}

.main .s-info {
    white-space: nowrap;
    color: #686666;
    margin-bottom: 0px;
    line-height: 27px;
}

.main .list {
    width: 100%;
    margin-top: 50px;
}

.main .list .border {
    width: 95%;
    border-bottom: 1px solid #E3E3E3;
}

.main .list ul {
    flex-direction: row;
    justify-content: space-between;
    padding-bottom: 40px;
    overflow: hidden;
    background-color: #fff;
}

.main .list ul li {
    overflow: hidden;
    /* height: 830px; */
    height: 300%;
}

.main .list ul li .list_number {
    width: 106px;
    height: 109px;
    background-repeat: no-repeat;
    background-size: cover;
}

.main .list ul li .list_number1 {
    background: url('../img/h_number (2).png');
}

.main .list ul li .list_number2 {
    background: url('../img/h_number (3).png');
}

.main .list ul li .list_number3 {
    background: url('../img/h_number(4).png');
}

.main .list ul li .list_number4 {
    background: url('../img/h_number (1).png');
}

.main .list ul li .s-info {
    height: 200px;
    text-align: center;
}

.main .list ul li .s-info span {
    text-align: left;
    display: inline-block;
}

.main .list ul li .s-h2 {
    font-size: 22px;
}

.main .list ul li .model {
    width: 100%;
    height: 42%;
}

.main .list ul li .model img {
    width: 100%;
    height: 100%;
    transition: transform 1s;
}

.main .list ul li .model img:hover {
    transform: scale(1.05);
}

.footer {
    margin-top: 50px;
}

.animation2 {
    animation-name: animation;
    animation-duration: 2s;
    animation-fill-mode: forwards;
    position: relative;
}

@keyframes animation {
    0% {
        bottom: -100px;
        opacity: 0;
    }
    100% {
        bottom: 0;
        opacity: 1;
    }
}

@media screen and (max-width: 970px) {
    .tomargin {
        margin-top: 70%;
    }
    .banner .b_img {
        width: 100%;
        height: 235px;
    }
    .main .list ul li {
        height: 610px;
    }
    .main .list ul li .model {
        width: 60%;
        height: 32%;
        text-align: center;
    }
    .main .list ul li:nth-child(3) .s-info {
        height: 140px;
    }
    .main .list ul li:nth-child(3) img {
        margin-left: -4%;
    }
    .main .list ul li:nth-child(4) .s-info {
        height: 140px;
    }
    .main .list ul li:nth-child(4) img {
        margin-left: -4%;
    }
}

@media screen and (max-width: 768px) {
    .tomargin {
        margin-top: 65% !important;
    }
    .banner .b_img {
        width: 100%;
        height: 175px;
    }
    .main {
        width: 100%;
        margin-top: 0;
        padding-bottom: 0;
    }
    .main .list {
        margin-top: 0;
    }
    .main .list ul li {
        height: 600px;
    }
    .main .list ul li .list_number {
        width: 70px;
        height: 60px;
        background-size: cover;
        background-repeat: no-repeat;
    }
    .main .list ul li .s-h2 {
        font-size: 16px;
    }
    .main .list li:nth-child(3) .s-info,
    .main .list li:nth-child(4) .s-info {
        height: 110px;
    }
    .main .list li:nth-child(3) img,
    .main .list li:nth-child(4) img {
        margin-left: -4%;
    }
    .main .list li:nth-child(4) img {
        margin-left: -35%;
    }
    .main .list ul li .s-info {
        padding-left: 0;
        font-size: 10px;
        line-height: 22px;
        height: 160px;
    }
    .main .list ul li .model {
        width: 80%;
        height: 32%;
    }
}

@media screen and (max-width: 500px) {
    .tomargin {
        margin-top: 70%;
    }
    .banner .b_img {
        width: 100%;
        height: 175px;
    }
    .main {
        width: 100%;
        margin-top: 20px;
        padding-bottom: 0;
    }
    .main .list {
        margin-top: 0;
    }
    .main .list ul li {
        height: 520px;
    }
    .main .list ul li .list_number {
        width: 70px;
        height: 60px;
        background-size: cover;
        background-repeat: no-repeat;
    }
    .main .list ul li .s-h2 {
        font-size: 16px;
    }
    .main .list li:nth-child(3) .s-info,
    .main .list li:nth-child(4) .s-info {
        height: 110px;
    }
    .main .list li:nth-child(3) img,
    .main .list li:nth-child(4) img {
        margin-left: -4%;
    }
    .main .list li:nth-child(4) img {
        margin-left: -35%;
    }
    .main .list ul li .s-info {
        padding-left: 0;
        font-size: 10px;
        line-height: 22px;
        height: 160px;
    }
    .main .list ul li .model {
        width: 80%;
        height: 32%;
    }
}