html,
body {
    position: relative;
    height: 100%;
    background-color: #000;
}
body {
    background-color: #000;
    font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
    font-size: 14px;
    color: #000;
    margin: 0;
    padding: 0;
}
.head{
    position: fixed;
    top: 0px;
    width: 100%;
    justify-content: space-between;
    height: 110px;
    background: linear-gradient(to bottom, #000000 0%, transparent 100%);
    z-index: 100;
}
.head-block{
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
    margin: auto;
    padding: 20px 60px;
}
.logo img{

    width: 160px;
}
.title-1{
    position: absolute;
    bottom: 30%;
    left: 50%;
    transform: translateX(-50%);
    width: 700px;
    z-index: 1;
}
.down-a{
    cursor: pointer;
    width: 180px;
    height: 50px;
    background-image: url('../img/down.png');
    background-size: 100% 100%;
    background-repeat: no-repeat;
}
.down-a:hover{
    background-image: url('../img/down-a.png');
    background-size: 100% 100%;
}

.sec{
    position: relative;
    width: 100%;
    height: 100%;
    min-width: 1200px;
}
.sec .banner{
    width: 100%;
    height: 100%; /* 或使用vh单位 */
    background-image: url('your-image.jpg');
    background-size: cover; /* 或 contain */
    background-position: center;
    background-repeat: no-repeat;
}
.banner.first{
    background-image: url('../img/banner1.png');
}

.banner.third{
    background-image: url('../img/banner3.png');
}
.sec.s3{
  height: 1600px;
}
.down-wrap{
    position: absolute;
    bottom: 5%;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.pc-down{
    width: 190px;
    height:160px;
    margin-right: 40px;
    cursor: pointer;
    background-image: url('../img/icon.png');
    background-size: 100% 100%;
    background-repeat: no-repeat;
}
.pc-down:hover{
    background-image: url('../img/icon-a.png');
    background-size: 100% 100%;
}
.code{
    display: flex;
    align-items: center;
    justify-content: center;
    width: 190px;
    height:160px;
    background-image: url('../img/code.png');
    background-size: 100% 100%;
    background-repeat: no-repeat;
}
.code-2{
    margin-left: 20px;
    width: 130px !important;
    height: 130px !important;
}
.more{
    position: absolute;
    left: 50%;
    transform:translateX(-50%);
    bottom: 10px;
    font-size: 14px;
    color: #696E76;
    cursor: pointer;  
    z-index: 3;
}
.more img{
   display: block;
   margin: 8px auto auto auto;
   width: 23px;
   height: 10px;
}
.play-btn{
    cursor: pointer;
    position: absolute;
    bottom: 3%;
    left: 50%;
    transform: (-50%);
    transform: translateX(-50%);
    width: 312px;
    height: 70px;
    background-image: url('../img/btn.png');
    background-size: 100% 100%;
    background-repeat: no-repeat;
}
.play-btn:hover{
    background-image: url('../img/btn-a.png');
    background-size: 100% 100%;
}
.about-footer{
    height: 60px;
    width: 100%;
    font-size: 12px;
    text-align: center;
    line-height: 30px;
    color: rgba(255,255,255, 0.5);
    z-index: 4;

}
.about-footer a{
    color: rgba(255,255,255, 0.5);
    text-decoration: none;
}
.about-footer a:hover{
    text-decoration: underline;
}

.flex-align{
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
}
.flex-end{
    display: flex;
    justify-content: space-between;
    -webkit-box-align: end;;
    -ms-flex-align:end; ;
    align-items: flex-end;
}
@media (max-width: 1400px) {
    .down-wrap{
        bottom: 8%;
    }
    .pc-down{
        width: 160px;
        height:130px;
        margin-right: 10px;
        cursor: pointer;
        background-image: url('../img/icon.png');
        background-size: 100% 100%;
        background-repeat: no-repeat;
    }
   .code{
        display: flex;
        align-items: center;
        justify-content: center;
        width: 160px;
        height:130px;
        background-image: url('../img/code.png');
        background-size: 100% 100%;
        background-repeat: no-repeat;
    }
    .code-2{
        margin-left: 20px;
        width: 100px !important;
        height: 100px !important;
    }
    .down-a{
        width: 150px;
        height: 40px;
    }
    .play-btn{
        bottom: 4%;
        width: 240px;
        height: 55px;
    }
    .banner.third{
        background-size: 150% 100%;
    }
}