* {
  padding: 0;
  margin: 0;
}
.index {
  width: 100%;
}
.banner-box {
  position: relative;
}
.banner-bg {
  width: 100%;
  /* position: absolute;
  left: 0;
  top: 0;
  z-index: -1; */
}
.title {
  display: flex;
  align-items: center;
  left: 280px;
  top: 33px;
  position: absolute;
}
.title-logo {
  width: 40px;
  height: 36px;
  margin-right: 31px;
}
.title-text {
  font-size: 24px;
  color: #333333;
  font-weight: bold;
}

.banner-content {
  font-size: 44px;
  color: #ffffff;
  left: 790px;
  top: 200px;
  position: absolute;
}

.title-nav {
  display: flex;
  align-items: center;
  left: 700px;
  top: 80px;
  position: absolute;
}

.title-nav > div {
  width: 150px;
  height: 50px;
  text-align: center;
  color: #ffffff;
  font-size: 20px;
}

.title-nav > div > a {
  color: #ffffff;
  text-decoration: none;
}

.introduce {
  padding: 40px 20%;
  box-sizing: border-box;
}

.introduce-title {
  font-weight: bold;
  color: #333333;
  font-size: 24px;
  font-family: Hiragino Sans GB;
}

.introduce-content {
  padding: 40px 80px;
  box-sizing: border-box;
  font-weight: bold;
  color: #333333;
  line-height: 28px;
  font-size: 16px;
  text-indent: 2em;
}

.function {
  background: #f5f7fe;
  padding: 40px 20%;
  box-sizing: border-box;
}

.function-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 40px 0px;
  box-sizing: border-box;
}

.function-card-box {
  width: 23%;
}
.function-card-box-title {
  background: #3475cb;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 28px;
  color: #fff;
  height: 112px;
}
.function-card-box-title-img {
  width: 50px;
  margin-right: 20px;
}

.function-card-box-content {
  background: #ffffff;
  color: #666666;
  font-size: 18px;
  padding: 30px 0px;
  box-sizing: border-box;
}
.function-card-box-content > div {
  text-align: center;
  height: 40px;
  line-height: 40px;
}

.platform {
  padding: 40px 20%;
  box-sizing: border-box;
}
.platform-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 40px 0px;
  box-sizing: border-box;
}
.platform-card-box {
  width: 140px;
}

.platform-img > img {
  width: 140px;
}

.platform-text {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #333333;
  font-size: 18px;
  font-weight: bold;
  margin-top: 40px;
}

.bottom {
  background-color: #3475cb;
  text-align: center;
  padding: 20px 0;
  box-sizing: border-box;
  color: #f5f7fe;
  font-size: 14px;
  /* text-decoration: underline; */
  display: flex;
  align-items: center;
  justify-content: center;
}
.bottom > a{
  color: #f5f7fe;
}