/*2017       新建 严宏丹*/
/*2019-04-19 修改 程培建*/

img {
	width: 100%;
	vertical-align: middle;
}

a {
	text-decoration: none;
	outline: none;
}

body, html {
	font-size: 14px;
	font-family: "SF Pro SC", "HanHei SC", "SF Pro Text", "Myriad Set Pro", "PingFang SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
	overflow-x: hidden;
}

.theme-dark {
	background-color: #1A1A1A;
	padding-top: 74px;
	height: 920px;
	text-align: center;
}

.dark-wrapper {
	width: 980px;
	margin: 0 auto;
	position: relative;
	text-align: center;
	z-index: 3;
}

.tips {
	color: #888;
	border: 1px solid #888;
	margin-bottom: 20px;
	border-radius: 4px;
	display: inline-block;
	padding: 0 15px;
	height: 33px;
	line-height: 30px;
	white-space: nowrap;
	font-family: "宋体","SF Pro Text", "SF Pro Icons","Helvetica Neue","Helvetica","Arial",sans-serif;
}

.caption {
	font-size: 80px;
	line-height: 1.0625;
	font-weight: 500;
	letter-spacing: -.02em;
	margin-bottom: 30px;
	color: #fff;
}

.subtitle {
	font-size: 34px;
	line-height: 1.05;
	font-weight: 500;
	letter-spacing: .008em;
	color: #fff;
	padding-left: 1em;
}

.more {
	display: inline-block;
	font-size: 24px;
	letter-spacing: .016em;
	margin: 30px 35px 0 0;
	color: #6bf;
	position: relative;
}

.more:hover {
	text-decoration: underline;
}

.more::after {
	content: " ";
	display: inline-block;
	width: 18px;
	height: 24px;
	background: url(icon.png) no-repeat;
	position: absolute;
	margin: 4px 0 0 5px;
}

.theme-light .more::after, .buy-link .more::after {
	content: " ";
	display: inline-block;
	width: 15px;
	height: 21px;
	background: url(light-icon.png) no-repeat;
	position: absolute;
	margin: 6px 0 0 8px;
}

.dark-img {
	width: 1506px;
	z-index: -1;
	margin-left: calc((100% - 1506px) / 2);
	text-align: center;
	margin-top: 24px;
}

.theme-light {
	background-color: #fafafa;
	max-width: 1350px;
	margin: 50px auto 0 auto;
	padding-top: 68px;
	text-align: center;
}

.theme-light .dark-wrapper .caption,
.theme-light .dark-wrapper .subtitle {
	color: #333;
}

.light-img {
	width: 1200px;
	height: 750px;
	margin: 56px auto 70px auto;
}

.backTop {
	position: fixed;
	width: 42px;
	height: 42px;
	z-index: 10;
	border-radius: 50%;
	bottom: 60px;
	right: -100px;
	transition: transform .4s,background-color .15s;
	cursor: pointer;
	background: url(top_black.png) center center no-repeat #ECECEC;
	background-size: 25px;
}

.backTop:hover {
	background: url(top_white.png) center center no-repeat #000;
	background-size: 25px;
}

.hide {
    display: none;
}

@media screen and (max-width: 768px) {
	.theme-dark {
		height: initial;
	}

	.dark-wrapper {
		width: initial;
	}

	.dark-img {
		max-width: 100%;
		max-height: 560px;
		margin-left: initial;
		margin-top: 20px;
	}

	.light-img {
		max-width: 90%;
		height: initial;
	}

	.caption {
		font-size: 40px;
	}

	.subtitle {
		font-size: 20px;
	}

	.more {
		font-size: 16px;
	}

	.more::after, .theme-light .more::after, .buy-link .more::after {
		margin: initial;
	}

	.theme-light {
		max-width: 100%;
		margin-top: 0px;
		padding-top: 34px;
	}
}