@charset "utf-8";
/* CSS Document */
* { 
	padding:0;
	margin:0;
}
body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI", Helvetica, Arial, "PingFang SC", "Microsoft YaHei", "WenQuanYi Micro Hei", 
	sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji";
    font-size: 14px;
    font-style: normal;
    color: #333;
	min-width:1000px;
	overflow:auto;
}
.landing_top { 
	height:70px;
	line-height:70px;
	background:#e7e7e9 url(images/top_bg.png) no-repeat top center;	
}
.logo { 
	float:left;
	height:70px;
	line-height:70px;
	margin-left:50px;
}
.logo a { 
	height:70px;
	display:inline-block;
}
.logo a img { 
	margin:7px 5px 0 0;
} 
.logo span { 
	display:inline-block;
	height:70px;
	line-height:70px;
	vertical-align:top;
	font-size:16px;
	font-weight:bold;
}
.landing_nav {
	float:right;
	height:70px;
	line-height:70px;
	margin-right:10px;
} 
.landing_nav a { 
	margin-right:15px;
	color:#333;
	text-decoration:none;
}
.landing_nav a:hover { 
	text-decoration:underline;
}
.landing_banner { 
	width:100%;
	height:480px;
	background:url(images/banner.png);
	background-position:50%;
	background-size:cover;
	position:relative;
}
.banner_left { 
	position:absolute;
	left:20%;
	bottom:40px;
	width:70px;
	height:70px;
	z-index:100;
	background:url(images/banner_left.png) no-repeat center;
}
.banner_right {
	position:absolute; 
	right:7%;
	top:60px;
	width:120px;
	height:120px;
	z-index:100;
	background:url(images/banner_right.png) no-repeat center;
}
.landing_banner_msg { 
	width:619px;
	height:480px;
	margin:0 auto;
	padding-top:120px;
	box-sizing:border-box;
	text-align:center;
}
.landing_banner_msg h2 { 
	font-size:36px;
	margin-bottom:30px;
	width:619px;
}
.landing_banner_msg p { 
	width:550px;
	font-size:16px;
	line-height:24px;
	color:#444;
	margin-bottom:60px;
	margin-left:30px;
}
.landing_btn { 
	color:#fff;
	text-decoration:none;
	line-height:40px;
	background:#327fff;
	border-radius:20px;
	height:40px;
	display:inline-block;
	padding:0 40px;
	font-size:18px;
}
.landing_btn:hover { 
	background:#0957d8;
}
.landing_foot { 
	width:1000px;
	margin:0 auto;
	text-align:center;
	padding-top:30px;
	box-sizing:border-box;
}
.landing_foot h2 { 
	font-size:28px;
	margin-bottom:30px;
}
.landing_foot_sort ul { 
	display: flex;
    align-items: stretch;
}
.landing_foot_sort ul li { 
	width:300px;
	min-height:160px;
	max-height:200px;
	overflow:hidden;
	list-style:none;
	padding:20px;
	box-sizing:border-box;
	border:1px solid #e6e5ea;
	border-radius:10px;
	text-align:left;
	margin-right:10px;
	display:inline-block;
}
.landing_foot_sort ul li:nth-child(2) { 
	margin:0 35px;
}
.sort_box_img { 
	height:40px;
	
}
.landing_foot_sort ul li h3 { 
	font-size:15px;
	line-height:35px;
}
.landing_foot_sort ul li  p { 
	font-size:12px;
	line-height:20px;
}

.footer {
    text-align: center;
    padding: 20px;
    color: #718096;
    font-size: 14px;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: #2d8cf0;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(45, 140, 240, 0.3);
    transition: all 0.3s;
    opacity: 0;
    visibility: hidden;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: #1a73e8;
    transform: translateY(-2px);
}

@media (max-height: 820px) {
    .landing_banner,.landing_banner_msg {
       height: 400px;
    }
	.landing_banner_msg  { 
		padding-top:80px;
	}
}