style.css

*{
	margin:0;  /* 重置所有样式 */
	padding:0;
	box-sizing:border-box;  /* width=border的宽,height=border的高 */
	font-family: helvetica;,"PingFang SC","Microsoft Yahei",sans-serif;
	font-size: 14px;
}

img{
	width:100%;
}

:root{  /* 选择文档的根元素,相当于html元素 */
	--primary-color:#ff434f;
	--secondary-color:#e3e3e3;
	--text-color-lightest:#e7e9ec;
	--text-color-darker:#2e2e2e;
	--text-color-dark:#494949;
	--text-color-gray:#8b8b8b;
	--text-color-drak-gray:#727272;
	--text-color-light-gray:#c6c6c6;
	--backdrop-color:rgba(42,42,42,0.69);
}

header{  /* 头部 */
	width:100vw;
	height:80px;
	display: grid;  /* 栅格布局 */
	padding:0 40px;
	
	grid-template-columns: 1fr 2fr;  /* 第一列:第二列=1:2 */
	align-items: center;  /* 所有列垂直居中 */
	position:relative;
	z-index: 200;  /* 置于最顶层 */
} 

.logo{
	font-size:24px;
	font-weight:600;
	color:var(--text-color-lightest);  /* 字体颜色 */
}

header nav{
	justify-self: end;  /* 导航栏居右侧 */
}

header nav i{  /* 放大镜图标 */
	color:var(--text-color-lightest);
}

header nav a{
	color:var(--text-color-lightest); 
	text-decoration: none;
	margin:0 24px; /* 导航栏菜单左右相隔24像素 */
}

header .burger{
	display:none;  /* 隐藏折叠按钮 */
}

header.sticky{  /* 当js中把class改成.sticky时才会应用 */
	position: fixed;
	background-color: white;
	box-shadow: 0 0 18px rgba(0,0,0,0.2);
	animation:dropDown 0.5s ease-in-out forwards;
}

header.sticky .logo,
header.sticky nav a,
header.sticky nav i{
	color:var(--text-color-darker);
}

@keyframes dropDown{  /* 关键帧动画 */
	from{
		transform: translateY(-100px);
	}
	to{
		transform: translateY(0);
	}
}

.glide{
	display: relative;
	top:-80px;  /* 轮播组件上移80像素,与导航栏重叠 */
	z-index: 50;  /* 置于导航栏后层 */
}

.glide__slide img,
.glide__slide video{
	width:100vw;  /* 和浏览器宽高一样 */
	height:100vh;
	object-fit:cover;  /* 等比例的缩放 */
}

.slide-caption{  /* 标题文字和按钮 */
	position:absolute;
	z-index:70;
	color:var (--text-color-lightest);
	text-align: center;  /* 文本居中 */
	max-width:60vw;
}

.glide__slide{
	display: flex;  /*弹性盒布局*/
	align-items: center;
	justify-content: center;
}

.slide-caption h1{  /* 标题大文字 */
	font-size: 54px;
	font-weight: 600;
}

.slide-caption h3{  /* 标题小文字 */
	font-size:24px;
	margin:48px 0;
}

.slide-caption.left{  /* 第二张的标题文字和按钮 */
	max-width: 80vw;
	text-align: left;  /* 靠左对齐 */
}

.slide-caption>*{  /* 标题下所有的直接子元素透明,用于动画 */
	opacity: 0;
}

.backdrop{  /* 背景的遮罩 */
	background:var(--backdrop-color);
	z-index: 60;  /* 置于背景图上 */
	position:  absolute;
	width:100%;
	height:100%;
	left:0;
	top:0;
	opacity: 0.5;  /* 透明度 */
}

.explore-btn{  /* 探索更多按钮 */
	padding:14px 32px;
	background-color:var(--primary-color);
	border:0;
	border-radius: 4px;
	color:var(--text-color-lightest);
	font-size:18px;
	cursor: pointer;  /* 鼠标移上去有小手的形状 */
	outline:none;  /* 去除谷歌浏览器点击时的蓝色边框 */
}

/* 内容区域 */
/* 通用样式 */

.content-wrapper{
	display: flex;
	align-items: center;
	justify-content: center;
	flex-direction: column; /* 按列的方式布局 */
}

section{
	display: grid;  
	justify-items: center;  /* 每个列居中对齐 */
	max-width:1180px;
	padding:0 80px;
}

section-bg{
	position:relative;
}

section-bg::before{  /* 设置背景 */
	content: "";
	display: block;
	position:absolute;
	background-color: #f9fbfb;
	width:100vw;
	height:100%;
	z-index:-1;
}

.title1{  /* 关于我们 */
	font-size: 34px;
	color:var(--text-color-darker);
}

.title1::after{  /* 关于我们下面的划线 */
	content:"";  
	display: block;
	width: 80%;  /* 相对于标题"关于我们" */
	height: 4px;
	background-color: var(--primary-color);
	margin-top:14px;
	transform:translateX(10%);  /* 向右移动10%居中 */
}

.intro{  /* 关于我们下面的文字简介 */
	margin: 28px 0 60px 0;
	font-size: 18px;
	color:var(--text-color-dark-gray);
}

/* 关于我们 */

.about-us{
	padding-bottom:32px;
}

.features{
	display: grid;
	grid-template-columns: repeat(3,1fr);
	grid-template-rows: 126px 126px;
	column-gap:5vw;  /* 间隙，5%浏览器宽度 */
}

.feature{
	display: grid;
	grid-template-areas: "icon title"  /* 分成四个区域 */
						"icon content";
	grid-template-columns: 60px 1fr;
	grid-template-rows: 1fr 3fr;
}

.feature i.fas{
	grid-area: icon;
	font-size:34px;
	color:var(--primary-color);
}

.feature-title{
	grid-area:title;
	font-size:18px;
	color:var(--text-color-darker);
}

.feature-concent{
	grid-area: content;
	color:var(--text-color-gray);
	margin-top: 8px;
}

/* 成功案例 */
.showcases{
	max-width: unset;  /* unset是inherit(继承)和initial(初始化)的通用替身 */
	padding:0;
	padding-top: 72px;
}

.filter-btns{
	margin-top:54px;
	margin-bottom: 38px;
}

.filter-btn{  /* 每个按钮样式 */
	margin:0 7px;
	background-color: var(--secondary-color);
	border:0;
	color:var(--text-color-dark-gray);
	padding:8px 18px;
	border-radius:4px;
	cursor:pointer;
	transition:0.4s;  /* 0.4s的过渡效果 */
}

.filter-btn:focus,  /* 按钮选中 */
.filter:active{  /* 按钮点击 */
	outline:none;  /* 去除边框 */
}

.filter-btn.active,  /* 激活后的按钮 */
.filter-btn:hover{  /* 鼠标悬停在上的按钮 */
	background-color: var(--primary-color);
	color:white;
}

.showcases .cases{
	width:100vw;
}

.showcases .case-item{
	width:25vw;
	height:20vw;
	overflow:hidden;  /* 图片缩放时溢出不可见 */
}

.case-item img{
	height:100%;
	object-fit: cover;  /* 自动等比例的缩放 */
}

/* 服务流程 */
.service{
padding-top:131px;
}

.services{
	display:grid;
	grid-template-columns: repeat(3,1fr);
	grid-template-rows: 1fr 1fr;
	column-gap: 38px;
	row-gap: 34px;
}

.service-item{  /* 用栅格布局 */
	display:grid;
	grid-template-areas: 
	"icon title"
	"icon content";
	grid-template-columns: 70px 1fr;
	grid-template-rows: 1fr 3fr;
	padding:24px;
	box-shadow: 0px 0px 18px rgba(0,0,0,0.06);
}

.service-item i.fas{
	grid-area:icon;
	font-size:42px;
	color:var(--primary-color);
	padding-top: 6px;
}

.service-item .service-title{
	grid-area: title;
	color:var(--text-color-darker);
	font-size: 24px;
}

.service-item .service-content{
	grid-area: content;
	color: var(--text-color-gray);
	line-height:30px;
	font-size: 16px;
	margin-top: 8px;
}

/* 团队介绍*/
.team-intro{
	margin-top:48px;
	padding-top:62px;
	padding-bottom:52px;
}

.team-members{
	display: grid;
	grid-template-columns: repeat(4,1fr);
	column-gap:24px;
	margin-top:86px;
}

.team-member{
	background-color: white;
	box-shadow: 0px 0px 24px rgba(0,0,0,0.2);
	text-align: center;
	padding-bottom: 28px;
	
	transition: 0.4s;
	
	display:grid;
	justify-content: center;
}

.profile-image{
	overflow: hidden;
}

.profile-image img{
	width:100%;
	height:264px;
	object-fit:cover;
	object-position:top center;
}

.team-member .name{
	margin-top: 18px;
	font-size: 18px;
	font-weight: 500;
	color:var(--text-color-dark);
}

.team-member .position{
	color:var(--text-color-dark-gray);
	margin-top:12px;
	margin-bottom: 18px;
}

.social-links{
	width:100%;
	max-width: 200px;
	display:flex;
	justify-content: space-between;
	padding:0 42px;
	margin:0 auto;  /* 这里是自己加的,为了使容器水平居中 */
}

.social-links li{
	list-style: none;
}

.social-links li a{
	color:var(--text-color-dark);
	text-decoration: none;
}

.team-member:hover{  /* 鼠标悬停在上面的样式 */
	transform:translateY(-20px) scale(1.05);
	box-shadow:0px 0px 36px rgba(0,0,0,0.1);
}

/* 数据部分 */
.data-section{
	max-width:unset;  /* 默认和初始化，因为全屏的宽度 */
	width:100vw;
	height: 255px;
	background-image: url(images/adult-business-computer-contemporary-380769.jpg);
	background-size: cover;  /* 类似于object-fit等比例的缩放 */
	background-position: center;  /* 显示中心区域 */
	
	display: grid;
	grid-template-columns: repeat(4,minmax(auto,220px)); /* 最小自动，最大到220像素 */
	justify-content: center;
	align-items: center;
	position: relative;
	z-index:20;
}

.data-section::before{  /* 背景遮罩层 */
	content: "";
	display: block;
	position: absolute;
	background-color: var(--backdrop-color);
	width:100%;
	height: 100%;
	z-index:1;
}

.data-piece{
	width:250px;
	display: grid;
	grid-template-rows: repeat(3,1fr);  /* 三行 */
	justify-items: center;
	color:white;
	position:relative;
	z-index:40;
}

.data-piece i.fas{  /* 图标大小 */
	font-size: 44px;
}

.data-piece .num{  /* 数字 */
	margin-top: 7px;
	font-size: 41px;
	font-weight: 600;
}

.data-piece .data-desc{  /* 单位 */
	font-size: 18px;
	font-weight: 500;
}

/* 公司动态 */
.company-activities{
	margin-top: 88px;
}

.activities{
	display: grid;
	grid-template-columns: repeat(3,1fr);
	column-gap: 24px;
}

.activity{
	box-shadow: 0px 0px 24px rgba(0,0,0,0.1);  /* 向下移24像素的阴影 */
	padding:24px;
	transition:0.4s;
}

.act-image-wrapper{  /* 图片容器 */
	height:255px;
	overflow: hidden;  /* 溢出隐藏 */
	margin:-24px;
	margin-bottom: 0;
}

.act-image-wrapper img{
	min-height: 300px;
	object-fit: cover;  /* 图片缩放撑满 */
}

.activity .meta{
	margin-top: 20px;
	margin-bottom: 12px;
	color:var(--text-color-light-gray);
	font-size:12px;
	display: flex;
}

.activity .meta>p:last-child{
	margin-left: 36px;
}

.act-title{
	color:var(--text-color-dark);
	font-size: 18px;
	margin-bottom:16px;
}

.activity article{
	color:var(--text-color-gray);
	letter-spacing: 0.54px;  /* 字间距 */
	line-height:24px;
}

.readmore-btn{  /* 阅读更多按钮 */
	border:0;
	color:white;
	background-color: var(--primary-color);
	border-radius: 4px;
	padding:6px 14px;
	margin-top: 24px;
}

.activity:hover{  /* 鼠标移到上面的动画效果 */
	transform: translateY(-20px) scale(1.05);
	box-shadow: 0px 0px 36px rgba(0,0,0,0.1);  /* 阴影左右扩散 */
}

/* 底部信息 */
footer{
	margin-top:124px;
	background-color: #181818;
	display: grid;
	justify-items: center;  /* 每列居中显示 */
	padding-top:72px;
	padding-bottom: 24px;
}

.footer-menus{  /* 底部菜单项 */
	width:100%;
	max-width:1180px;
	display:grid;
	grid-template-columns: 2fr repeat(4,1fr);  /* 2:1:1:1:1 */
	padding:0 80px;
	position:relative;
}

.menu-title{  /* 底部一级标题 */
	font-size: 16px;
	color:white;
	font-weight: 500;
	margin-bottom: 20px;
}

.contact-us{  /* 联系我们 */
	justify-content: start ;
	color: var(--text-color-lightest);
}

.contact-us p:not(:first-child){  /* 不是第一个元素 */
	padding-bottom:16px;
} 

.menu-items li{  /* 导航菜单的样式 */
	list-style: none;
	padding-bottom:8px;
}

.menu-items li a{
	text-decoration: none;
	font-weight: 300;
	color:var(--text-color-lightest);
}

.icp-info{  /* 备案号 */
	margin-top: 24px;
	margin-bottom: 16px;
}

.icp-info,.rights{  /* 备案号和版权 */
	grid-column: 1/-1;
	justify-self:center;
	color:white;
}

.scrollToTop{  /* 返回顶部 */
	display: none;  /* 先设为不可见 */
	position:relative;
	z-index: 1000;  /* 使返回顶部按钮永远位于最顶层 */
}

.scrollToTop a{  /* 返回顶部按钮 */
	width:32px;
	height: 32px;
	border-radius: 4px;
	display: flex;
	align-items: center;
	justify-content: center;
	background-color: var(--primary-color);
	color:white;
	text-decoration: none;
	position: fixed;
	bottom:60px;
	right:30px;
}

@media (max-width:1100px) {  /* 小于1100像素导航菜单折叠 */
	header nav{
		display:none;
	}
	
	header{
		grid-template-columns: 1fr 1fr;
	}
	
	header .burger{
		display: block;
		width:20px;
		height:6px;
		position: relative;
		justify-self: end;
		cursor: pointer;
	}
	
	.burger-line1,  /* 三条线样式 */
	.burger-line2,
	.burger-line3{
		width:20px;
		height:2px;
		background-color: var(--text-color-lightest);
	}
	
	.burger-line1{
		position:absolute;
		top:-6px;
	}
	
	.burger-line3{
		position: absolute;
		top:6px;
	}
	
	header.open nav{
		display: grid;
		position:absolute;
		left:0;
		top:0;
		width:100vw;
		height:100vh;
		background-color: white;
		grid-auto-rows: max-content;/* 最大取内容区的宽度 */
		justify-items: end;
		
		padding:0 40px;
		opacity: 0;
		animation: slideDown 0.6s ease-out forwards;
	}
	
	header.open nav>*{
		color:var(--text-color-darker);
		animation: showMenu 0.5s linear forwards 0.4s;
		font-size: 18px;
		margin:4px 0;
		opacity: 0;
	}
	
	header.open nav>i.fas{  /* 放大镜距离调整 */
		margin-top: 10px;
	}
	
	
	header.open .burger-line1,
	header.open .burger-line2,
	header.open .burger-line3,
	header.sticky .burger-line1,
	header.sticky .burger-line2,
	header.sticky .burger-line3{
		background-color: var(--text-color-darker);
		transition: 0.4s ease;
	}
	
	header.open .burger-line1{
		transform:rotate(45deg) translate(3px,5px);
	}
	
	header.open .burger-line2{
		transform: translateX(5px);
		opacity:0;
	}
	
	header.open .burger-line3{
		transform:rotate(-45deg) translate(3px,-5px);
	}
	
	header.open .logo{
		z-index:40;
		color:var(--text-color-darker);
	}
	
	@keyframes slideDown{  /* 下滑动画 */
		from{
			height:0;
			opacity: 0;
		}
		
		to{
			height: 100vh;
			padding-top: 80px;
			opacity: 1;
		}
	}
	
	@keyframes showMenu{  /* 菜单项下滑动画 */
		from{
			opacity: 0;
			transform: translateY(-1vh);
		}
		
		to{
			opacity: 1;
			transform: translateY(0);
		}
	}
	.service-item,
	.service-title{
		font-size: 20px;
	}
	
	.service-item .service-content{
		font-size:14px;
		line-height: 24px;
	}
	
	.team-members{
		grid-template-columns: repeat(2,1fr);
		row-gap:36px;
		column-gap: 6vw;
	}
	
	.activities{
		grid-template-columns: repeat(2,1fr);
		row-gap:36px;
	}
}


@media (max-width:992px) {
	.slide-caption h1{
		font-size: 48px;
	}
	
	.slide-caption h3{
		font-size: 18px;
	}
	
	.features,
	.services{
		grid-template-columns: repeat(2,1fr);
		grid-template-rows: unset;
	}
	
	.data-section{
		grid-template-columns: repeat(2,minmax(200px,auto));
		padding:24px 0;
		height:auto;
		row-gap: 24px;
		background-size: 200%;
	}
	
	.showcases .case-item{
		width:calc(100vw/3);
	}
	
	.footer-menu{
		padding:0 40px;
	}
	
	.footer-menus{
		grid-template-columns: 2fr repeat(2,1fr);
		row-gap:24px;
	}
	
	.contact-us{
		grid-row: 1 / 3;
	}
	
	.footer-menu{
		text-align: center;
	}
}

@media (max-width:820px) {
	.footer-menus{
		grid-template-columns: repeat(2,1fr);
		row-gap:24px;
	}
	
	.contact-us{
		grid-row: 1 / 5;
	}
}


@media (max-width:768px) {
	section{
		padding:0 40px;
	}
	
	.activities{
		grid-template-columns: 1fr;
		row-gap:36px;
	}
	
	.data-section{
		grid-template-columns: 1fr;
		background-size: 300%;
	}
	
	.team-members{
		grid-template-columns: minmax(200px,400px);
	}
	
	.features,
	.services{
		grid-template-columns: 1fr;
	}
	
	.showcases .case-item{
		width:calc(100vw/2);
		height:30vw;
	}
}


@media (max-width:576px) {
	.slide-caption h1{
		font-size: 28px;
	}
	
	.slide-caption h3{
		font-size: 14px;
	}
	
	.explore-btn{
		font-size:14px;
		padding:8px 18px;
	}
	
	.showcases .case-item{
		width:100vw;
		height:60vw;
	}
	
	.footer-menus{
		grid-template-columns:1fr;
		row-gap:24px;
	}
	
	.footer-menu{
		justify-self: start;
		text-align: left;
	}
}