*{
    padding: 0;
    margin: 0;
}

body{
    overflow-x: hidden;
    font-family: "微软雅黑"; 
    padding: 0;
    margin: 0;
}

.container{
    width: 100vw;
    height: 100%;
    background-image: url('../images/bg.jpg'); 
}

.header{
    width: 100%; 
    background-image: url('../images/header.png');
    height: 32.3vw;
}

.container, .header, .s3{ 
    background-size: 100% 100%;
    background-repeat: no-repeat; 
}

.navbar{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.s3{
    height: 30.71vw;
    background-image: url('../images/s3-bg.png');
} 

.s3,.s4,.s5,.s6{ 
    width: 100%;
}
 
.s4{ 
    background-image: url('../images/s4-bg.png');
}
 
 
.s5{ 
    background-image: url('../images/s5-bg.jpg');
}

.s6{
    background-image: url('../images/s6-bg.png');
}

.navbar-logo{
    width: 18.3vw;
    height: 3.8vw;
    margin-bottom: 3vw;
}

.introduce{
    display: block;
    color: #619542;
    width: 80vw;
    margin: 0 auto;
    line-height: 180%;
    letter-spacing: 3px;
    font-size: 18px;
    padding: 3vw 0;
}

.grid{
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    width: 58%;
}

.grid-item{   
    display: flex;
    width: 25%; 
    flex-direction: row;
    align-items: center; 
    flex-wrap: wrap; 
    margin: 15px 0;
    justify-content: center;
}

.grid-item img{
    width: 96%;
    height: 8.7vw;
    border: 5px solid #aed9a6;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    background: #aed9a6;
    cursor:pointer;
}

.title{ 
    line-height: 1.6;
    text-align: center;   
    color: #619542; 
    font-size: 16px;  
    font-weight: 600;
    cursor:pointer;
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
    width: 90%;
}
.title a{color: #619542; font-size: 16px; text-decoration:none }

.author{ 
    display: flex;
    flex-direction: row;
    align-items: center; 
    font-size: 12px;
    padding-top: 5px;
}

.author span{
    color: #CF0000;
    display: block;
    margin-left: 12px;
    cursor:pointer;
}
 
 
 
@media only screen  and (min-width: 320px) and (min-width: 352px) and (max-width: 640px) and (max-width: 750px) { 
    .introduce{
        font-size: 4vw !important;
        width: 92vw;
        letter-spacing: 1px;
    }
    .introduce img{width:100%}
    .introduce video{width:100%}
    .grid { 
       width: 96vw !important;
    } 

    .grid-item{
        width: 33% !important;
    }

    .grid-item img{
        height: 23vw !important;
    }
    .title{
        font-size: 3.5vw !important;
    }

    .author span{
        margin-left: 2vw !important;
    }
    .author{
        font-size: 3vw !important;
    }

    .navbar-logo{
        width: 58.3vw;
        height: 13.8vw;
        margin: 3vw 0;
    }

    .footer{
        font-size: 3vw !important;
    }
    h1{padding:8vw 4vw}
}

.footer{
    width: 60%;
    text-align: center;
    padding: 40px 0;
    font-size: 14px;
    color: #535353;
    margin: 0 auto;
}
.footer a{color: #535353;}

h1{text-align:center;font-size:26px;color: #619542;padding:32px 0}
.grid-item img:hover,.title a:hover{opacity:0.75}