.video_list {
	width: 1216px;
	margin-left: -16px;
}

.video_list li {
	float: left;
	width: 388px;
	margin-left: 16px;
	margin-bottom: 16px;
	position: relative;
}

.video_list li span {
	display: block;
	text-align: center;
	color: #333;
	line-height: 40px;
	background: #fff;
	position: relative;
	z-index: 99;
}

.video_list li .mask {
	display: block;
	width: 100%;
	height: 100%;
	position: absolute;
	top: 0;
	left: 0;
	z-index: 4;
	background: url(../css/mask.png) repeat;
	transition: all 0.5s ease 0s;
}

.video_list li:hover .mask {
	opacity: 0.5;
	transition: all 0.5s ease 0s;
}

.video_list li b {
	display: block;
	position: absolute;
	top: 50%;
	left: 50%;
	margin-top: -40px;
	margin-left: -30px;
	width: 60px;
	height: 60px;
	background: url(../css/syvi.png) no-repeat center;
	background-size: cover;
	z-index: 999;
}

.video_list li .ex_news_img {
	width: 388px;
	height: 245px;
	overflow: hidden;
}

.video_list li .img_box {
	width: 388px;
	height: 245px;
	overflow: hidden;
	background-position: center;
	background-size: cover;
	background-repeat: no-repeat;
}

.school_list li .ex_news_img {
	width: 384px;
	height: 250px;
	overflow: hidden;
}

.school_list li .img_box {
	width: 384px;
	height: 250px;
	overflow: hidden;
	background-position: center;
	background-size: cover;
	background-repeat: no-repeat;
}

.video_list li,
.video_list li .img_box,
.video_list li .ex_news_img,
.school_list li,
.school_list li .img_box,
.school_list li .ex_news_img {
	transition: all 0.6s cubic-bezier(0.215, 0.61, 0.355, 1) 0s;
}

.video_list li:hover .img_box,
.school_list li:hover .img_box {
	transform: scale(1.1, 1.1);
}

.school_list li:hover span {
	color: #575755;
}

.mask_bg {
	width: 100%;
	height: 100%;
	position: fixed;
	top: 0;
	left: 0;
	z-index: 10000;
	display: none;
	background: #000;
	opacity: 0;
	-webkit-animation: maskShow cubic-bezier(0.68, -0.55, 0.27, 1.55) 1s forwards;
	-o-animation: maskShow cubic-bezier(0.68, -0.55, 0.27, 1.55) 1s forwards;
	-ms-animation: maskShow cubic-bezier(0.68, -0.55, 0.27, 1.55) 1s forwards;
	animation: maskShow cubic-bezier(0.68, -0.55, 0.27, 1.55) 1s forwards;
}

@-webkit-keyframes maskShow {
	from {
		opacity: 0;
	}
	to {
		opacity: 0.5;
	}
}

@-o-keyframes maskShow {
	from {
		opacity: 0;
	}
	to {
		opacity: 0.5;
	}
}

@-ms-keyframes maskShow {
	from {
		opacity: 0;
	}
	to {
		opacity: 0.5;
	}
}

@keyframes maskShow {
	from {
		opacity: 0;
	}
	to {
		opacity: 0.5;
	}
}

.video_show {
	width: 1000px;
	height: 680px;
	position: fixed;
	left: 50%;
	margin-left: -500px;
	top: -1000px;
	margin-top: -340px;
	opacity: 0;
	z-index: 10001;
	border-radius: 5px;
	display: none;
	-webkit-animation: introShow cubic-bezier(0.68, -0.55, 0.27, 1.55) 1.2s 0.5s forwards;
	-o-animation: introShow cubic-bezier(0.68, -0.55, 0.27, 1.55) 1.2s 0.5s forwards;
	-ms-animation: introShow cubic-bezier(0.68, -0.55, 0.27, 1.55) 1.2s 0.5s forwards;
	animation: introShow cubic-bezier(0.68, -0.55, 0.27, 1.55) 1.2s 0.5s forwards;
}

@-webkit-keyframes introShow {
	from {
		opacity: 0;
		top: -1000px;
	}
	to {
		opacity: 1;
		top: 50%;
	}
}

@-o-keyframes introShow {
	from {
		opacity: 0;
		top: -1000px;
	}
	to {
		opacity: 1;
		top: 50%;
	}
}

@-ms-keyframes introShow {
	from {
		opacity: 0;
		top: -1000px;
	}
	to {
		opacity: 1;
		top: 50%;
	}
}

@keyframes introShow {
	from {
		opacity: 0;
		top: -1000px;
	}
	to {
		opacity: 1;
		top: 50%;
	}
}

.video_show i {
	display: block;
	width: 40px;
	height: 40px;
	position: absolute;
	right: -10px;
	top: 20px;
	line-height: 40px;
	font-size: 20px;
	text-align: center;
	cursor: pointer;
	color: #fff;
	font-size: 22px;
	transition: all 0.3s;
	-webkit-transition: all 0.3s;
	-moz-transition: all 0.3s;
	font-weight: bold;
	background: url(i_closed.png);
}

.video_show i:hover {
	transform: rotate(90deg);
}

.video_show .content {
	width: 90%;
	margin: 20px 5%;
}

.video_show .content h2 {
	line-height: 50px;
	color: #4c321c;
}

.video_show .content .show_date {
	width: 100%;
	height: 25px;
	margin: 10px 0;
	background: #F9F9F9;
	line-height: 25px;
	color: #666;
	text-indent: 2em;
}

.video_show .content .show_intro {
border: 8px solid #222;
border-radius: 8px;
	width: 100%;
	text-align: left;
	font-size: 14px;
	height: 580px;
background: #000;
}

.video_show iframe {
	width: 100%;
	height: 580px;
}