* {
    margin: 0;
    padding: 0;
}

li {
    list-style: none;
}

img {
    border: none;
}

body {
   
    overflow-x: hidden;
    background: #161623;
}
body::before{
    content: '';
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    background: linear-gradient(#f00,#f0f);
    clip-path: circle(30% at right 80%);/*!!!!!!!!*/
    position: fixed;
    z-index: -1;
}
body::after{
    content: '';
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    background: linear-gradient(#2196f3,#e91e63);
    clip-path: circle(20% at 10% 10%);/*!!!!!!!!*/
    position: fixed;
    z-index: -1;
}
/*滚动条*/
::-webkit-scrollbar{
    width: 20px;
}
::-webkit-scrollbar-thumb{
    background: linear-gradient(#00DBDE 0%,#FC00FF 100%);
    border-radius: 8px;
}
.play {
    width: 100vw;
    height: 70vh;
    position: relative;
    overflow: hidden;
}
.play-img{
    position: absolute;
    z-index: 20;
    color: whitesmoke;
    font-size: 7vmin;
    bottom: 220px;
    left: calc(50% - 5%);
    font-weight: 550;
    opacity: 0.9;
}
.oL {
    position: absolute;
    width: 100%;
    bottom: 20px;
    z-index: 2;
    display: flex;
    justify-content: center;
    align-items: center;
}

.oL li {
    margin-left: 10px;
    cursor: pointer;
    background-color: indigo;
    width: 20px;
    height: 20px;
    border-radius: 50%;
}

.oL .active {
    width: 20px;
    height: 20px;
    background-color: orange;
}

.ouL {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

.ouL li {
    width: 100vw;
    height: 100vh;
    float: left;
}

.ouL li a {
    float: left;
    width: 100vw;
    height: 100vh;
    background-size: cover;
    background-position: center;
}

.a1 {
    background-image: url(../img/b-1.png);
}

.a2 {
    background-image: url(../img/b-2.png);
}

.a3 {
    background-image: url(../img/b-3.png);
}

.a4 {
    background-image: url(../img/b-4.png);
}

.a5 {
    background-image: url(../img/b-5.png);
}

.a6 {
    background-image: url(../img/b-1.png);
}

/*-----------nav------------*/
nav {
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 80px;
    height: 60px;
    width: 100%;
    z-index: 10;
    position: fixed;
}
.nav_1 li a{
    text-decoration: none;
}
.n-line {
    position: absolute;
    top: 28px;
    width: 0px;
    border-bottom: 4px salmon solid;
    transition: .3s ease-in-out;
}

.logo {
    color: whitesmoke;
}

.nav_1 {
    display: flex;
    align-items: center;
}

.nav_1 li img {
    width: 20px;
    height: 20px;
    margin-right: 5px;
}

.nav_1 li {
    margin-left: 17px;
    display: flex;
    position: relative;
}

.nav_1 li a {
    color: whitesmoke;
    cursor: pointer;
}

.menu {
    display: none;
}

.mark {
    width: 100%;
    height: 60px;
    background-color: rgb(58, 58, 58);
    opacity: 0;
    position: absolute;
    left: 0;
    z-index: 9;
    position: fixed;
}

/*--------section-----------*/
section{
    width: 80%;
    margin: 30px auto;
    background-color: rgba(255, 255, 255, 0.1);/*!!!!*/
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    border-radius: 20px;
    box-shadow:20px 20px 50px rgba(0,0,0,.5);
}
.imgTitle{
    width: 80%;
    height: 50px;
    background-color: rgba(255, 255, 255, 0.1);/*!!!!*/
    box-shadow:20px 20px 50px rgba(0,0,0,.5);
    margin: 30px auto;
    border-radius: 15px;
    text-align: center;
    line-height: 50px;
    font-size: 4vmin;
    color: whitesmoke;
    opacity: 0.9;
}
.card2{
    min-width: 350px;
    height: 300px;
    border-radius: 20px;
    margin-bottom: 15px;
    overflow: hidden;
    position: relative;
    cursor: pointer;
}
.card2 .bg-img{
    width: 100%;
    height: 100%;
}
.card2 .i-mark{
    width: 0;
    height: 100%;
    background: coral;
    position: absolute;
    opacity: 0.8;
    animation: markWidth .5s forwards;
}
.card2 .i-mark-2{
    width: 0;
    height: 100%;
    background: crimson;
    position: absolute;
    opacity: 0.7;
    animation: markWidth-2 .5s .3s forwards;
}
.bg-img-mark{
    position: absolute;
    width: 100%;
    height: 100vh;
    left: 0px;
    top: 0px;
    position: fixed;
    display: none; 
}
.black{
   width: 100%;
   height: 100%;
   background: black;
   opacity: 0.8;
}
.c{
    width: 20px;
    height: 20px;
    position: absolute;
    right: 40px;
    top: 80px;
    cursor: pointer;
    z-index: 10;
}
.b-i{
    position: absolute;
    top: 80px;
    left: calc(50% - 540px);/*!!!!!!!!!*/
}
/*评论*/
.comment{
    width: 80%;
    background-color: rgba(255, 255, 255, 0.1);/*!!!!*/
    box-shadow:20px 20px 50px rgba(0,0,0,.5);
    margin: 30px auto;
    box-sizing: border-box;
    padding: 50px;
}
.comment-text{
    width: 100%;
    text-align: center;
    color: whitesmoke;
    font-size: 3vmin;
    margin-bottom: 10px;
}
.comment .from{
    display: flex;
    flex-direction: column;
}
.from .area{
    box-sizing: border-box;
    padding-left: 50px;
    margin-bottom: 15px;
}
.content{
    width: 100%;
    /* min-height: 300px; */ /*要设定一个高度才有滚动条*/
    height: 300px;
    margin-bottom: 15px;
    background-color: tomato;
    background-color: rgba(255, 255, 255, 0.1);/*!!!!*/
    box-shadow:20px 20px 50px rgba(0,0,0,.5);
    box-sizing: border-box;
    padding: 15px;
    overflow-y: auto;
}
.content .col{
    width: 80%;
    min-height: 30px;
    background-color: rgba(255, 255, 255, 0.1);/*!!!!*/
    box-shadow:20px 20px 50px rgba(0,0,0,.5);
    margin-bottom: 15px;
    color: whitesmoke;
    position: relative;
    box-sizing: border-box;
    padding: 20px;
}
.btn{
    width: 100%;
    padding: 10px 0;
    text-align: center;
    background: rgb(80, 222, 224);
    color: whitesmoke;
    font-weight: bold;
    cursor: pointer;
}
.btn:active{
    background: rgb(26, 106, 107);
    color: dimgray;
}
.content .col img{
    width: 15px;
    height: 15px;
    position: absolute;
    right: 5px;
    top: 5px;
    cursor: pointer;
}
/*footer*/
footer {
    width: 100vw;
    height: 30vh;
    background-image: url(../img/banner/footer-banner.png);
    background-position: center;
    background-size: cover;
    position: relative;
    margin-top: 50px;
    z-index: 0;
}
.mark-2::before{
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: #363d59;
    opacity: 0.6;
    z-index: 1;
}
.mark-2{
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.mark-2 p{
    color: white;
    font-weight: 400;
    text-align: center;
    line-height: 30px;
    z-index: 10;
}
/*keyframes*/
@keyframes markWidth{
    from{
        width: 0%;
    }
    to{
        width: 40%;
    }
}
@keyframes markWidth-2{
    from{
        width: 0%;
    }
    to{
        width: 25%;
    }
}
@media screen and (max-width:1050px){
    nav{
        padding: 0 40px;
    }
    .n-line{
        display: none;
    }
    .nav_1{
        position: absolute;
        top: 60px;
        right: 0;
        bottom: 0;
        width: 50vw;
        height: calc(100vh - 60px);
        background-color: rgb(58, 58, 58);
        flex-direction: column;
        z-index: 1;
        transform: translateX(100%);
		transition: 0.4s ease-in-out;
    }
    .open{
        transform: translateX(0);
    }
    .nav_1 li{
        margin: 3vh;
        transform: translateX(20px);
        opacity: 0; /*先设置在@keyframes*/
    }
    .menu{
        display: block;
    }
    @keyframes slideIn {
        form{
            transform: translateX(20px);
            opacity: 0;
        }
        to{
            transform: translateX(0);
            opacity: 1;
        }
    }

    .c{
        left: 90%;
    }
    .b-i{
        width: 90%;
        left: calc(50% - 187px);
        /* left: 20px; */
        margin-top: 100px;
    }
    .play-img{
        bottom: 400px;
    }
    /*评论*/
    .comment{
        width: 100%;
    }
    .content{
        height: 200px;
    }
    .content .col{
        padding: 8px;
    }
    .content .col img{
        width: 8px;
        height: 8px;
    }
}