html,
body {
  margin: 0;
  padding: 0;
}
body {
  background-color: #f6f8fa;
  min-height: 100vh;
  width: 100vw;
}
/* 导航栏 */
header {
  position: fixed;
  top: 0;
  left: 0;
  background-color: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  box-shadow: 0 5px 30px rgba(0, 0, 0, 0.1);
  font-size: 0;
  display: flex;
  justify-content: space-between;
  padding: 0 2rem;
  height: 3.4rem;
  width: 100vw;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -ms-box-sizing: border-box;
}
header > div {
  display: inline-block;
  vertical-align: top;
  font-size: 1rem;
  line-height: 1.2rem;
  line-height: 3.4rem;
  user-select: none;
  -webkit-user-select: none;
  /* Safari */
  -moz-user-select: none;
  /* Firefox */
  -ms-user-select: none;
  /* Internet Explorer/Edge */
}
.page-index .banner {
  width: 100vw;
  height: 80vh;
  background-image: url('/img/banner-1.png');
  background-size: cover;
}
.page-index .banner > div {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  background-color: #00000084;
  color: #ffffff;
  padding: 1.5rem 5rem 1rem;
  border-radius: 1rem;
}
.page-index .banner > div > div {
  font-size: 3rem;
  line-height: 4rem;
}
.page-index .banner > div .text {
  font-size: 1.2rem;
  opacity: 0.8;
}
.page-index .business-1 > div {
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -ms-box-sizing: border-box;
  max-width: 1440px;
  margin: auto;
  padding: 4rem 2rem;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
}
.page-index .business-1 > div > div {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  flex: 1;
}
.page-index .business-1 > div .business-img {
  background-image: url('/img/business-1.png');
}
.page-index .business-2 > div {
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -ms-box-sizing: border-box;
  max-width: 1440px;
  margin: auto;
  padding: 4rem 2rem;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
}
.page-index .business-2 > div > div {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  flex: 1;
}
.page-index .business-2 > div .business-img {
  background-image: url('/img/business-2.png');
}
.page-index .business-3 > div {
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -ms-box-sizing: border-box;
  max-width: 1440px;
  margin: auto;
  padding: 4rem 2rem;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
}
.page-index .business-3 > div > div {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  flex: 1;
}
.page-index .business-3 > div .business-img {
  background-image: url('/img/business-3.png');
}
.page-index .business-4 {
  background-color: #191817;
  padding: 4rem 0;
}
.page-index .business-4 > div {
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -ms-box-sizing: border-box;
  max-width: 1440px;
  margin: auto;
  background-color: #ffffff;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
}
.page-index .business-4 > div > div {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  flex: 1;
}
.page-index .business-4 > div .business-4-img {
  height: 45rem;
  background-size: cover;
  background-image: url('/img/business-4.png');
}
.page-index .business-img {
  margin: 0 3rem;
  height: 45rem;
  background-size: cover;
}
.page-index .business-text {
  position: relative;
}
.page-index .business-text > div {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
  text-align: center;
}
.page-index .business-text > div .business-title {
  font-size: 2rem;
  line-height: 5rem;
}
.page-index .business-text > div .business-list {
  font-size: 1.2em;
  line-height: 2rem;
  padding-bottom: 1rem;
  opacity: 0.5;
}
.page-index .business-text > div .business-bt {
  background-color: #3d70d7;
  font-size: 1rem;
  color: #ffffff;
  line-height: 2.4rem;
  border-radius: 1.2rem;
  cursor: pointer;
  display: inline-block;
  padding: 0 2rem;
}
footer {
  background-color: #191817;
  color: #ffffff;
}
footer > div {
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -ms-box-sizing: border-box;
  padding: 4rem 2rem;
  opacity: 0.6;
  max-width: 1440px;
  margin: auto;
  font-size: 1rem;
}