.side-nav ul{
    display:block;
}
.video-list .item {
    width: 25%;
}

.video-list li:nth-child(4n+1) {
    clear: left;
}

.video-list .item .box {
    margin: 0 10px 40px;
    position: relative;
}

.video-list .item .cover {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 5;
}

.video-list .pic {
    position: relative;
    overflow: hidden;
}

.pic:before {
    content: '';
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, .5);
    position: absolute;
    transition: all .3s ease-in-out;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 1;
}

.box:hover .pic:before {
    opacity: 0;
}

.box .pic img {
    width: 100%;
    -moz-transform: scale(1);
    -webkit-transform: scale(1);
    -o-transform: scale(1);
    -ms-transform: scale(1);
    transform: scale(1);
    -webkit-transition: all 0.8s ease;
    -moz-transition: all 0.8s ease;
    -ms-transition: all 0.8s ease;
    -o-transition: all 0.8s ease;
    transition: all 0.8s ease;
}

.box:hover .pic img {
    -moz-transform: scale(1.1);
    -webkit-transform: scale(1.1);
    -o-transform: scale(1.1);
    -ms-transform: scale(1.1);
    transform: scale(1.1);
}

.video-list .txt {
    position: relative;
    left: 0;
    right: 0;
    margin: 10px auto 0;
}

.video-list .name:before {
    content: '';
    width: 0;
    height: 2px;
    position: absolute;
    left: 0;
    background: #FF9200;
    display: block;
    top: 15px;
    left: 0;
    transition: all .3s ease;
}

.video-list .box:hover .name:before {
    width: 20px;
}

.video-list .name {
    display: block;
    color: #222222;
    font-size: 18px;
    font-weight: bold;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    text-align: center;
    margin: 2px 0;
    position: relative;
    transition: all .3s ease;
}

.video-list .box:hover .name {
    color: #FF9200;
    padding-left: 25px;
}

.video-title {
    font-size: 24px;
    font-family: 'Roboto', '微軟正黑體';
    padding: 5px 15px;
    color: #f08d1d;
    font-weight: normal;
}

.video-title:before{
    content:'';
    width: 8px;
    height: 8px;
    background: #f08d1d;
    position:relative;
    display:inline-block;
    vertical-align: middle;
    margin: 0 8px;
    border-radius: 50%;
}

@media screen and (max-width:1000px) {
    .video-list .item {
        width: 25%;
    }

    .video-list li:nth-child(4n+1) {
        clear: left;
    }
}

@media screen and (max-width:900px) {
    .video-list .item {
        width: 50%;
    }

    .video-list li:nth-child(4n+1) {
        clear: none;
    }

    .video-list li:nth-child(2n+1) {
        clear: left;
    }

    .video-list .item .box {
        margin-bottom: 30px;
    }

    .video-list .name {
        font-size: 16px;
        margin: 0;
    }

    .video-list .txt {
        margin-top: 5px;
    }
}

@media screen and (max-width:767px) {}

@media screen and (max-width:600px) {
    .video-list {
        margin: 0;
    }

    .video-list li {
        width: 100%;

    }
}