/* 头部导航栏 */
button {
  padding: 0;
  margin: 0;
  border: 0;
  outline: 0;
  background-color: transparent;
}

.nav {
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: 70px;
  width: 100%;
  font-family: "思源黑体";
  font-size: 18px;
}

.nav-nav li {
  float: left;
  width: 100px;
  height: 50px;
  line-height: 50px;
  text-align: center;
  position: relative;
}

.nav-nav li a:after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40%;
  height: 2px;
  /* 下划线的高度 */
  border-radius: 4px;
  background: rgb(30, 94, 255);
  /* 下划线的颜色 */
  transform: scaleX(0);
}

.nav-nav li a {
  display: inline-block;
  text-decoration: none;
}

.nav-nav li a:hover,
.nav-nav li a.active span,
.nav-nav li a:focus::after,
.nav-nav li a.active::after {
  color: rgb(30, 94, 255);
  transform: scaleX(1);
  font-weight: 550;
}

.nav-nav li a:hover::after {
  transform: scaleX(1);
}


.nav-nav li a div {
  width: 100px;
  height: 100%;
  overflow: hidden;
}

.nav-nav-item span {
  display: block;
  height: 100%;
  line-height: 50px;
  font-family: "思源黑体";
  font-size: 18px;
  font-weight: 400;
  letter-spacing: 0.2px;
  text-align: left;
}

/* 轮播图 */
.banner-wrap .banner-box img {
  position: relative;
  overflow: hidden;
  height: 400px;
}

.banner-bj img {
  width: 100%;
  height: 586px;
  object-fit: cover;
}



/* 方案介绍 */

.introduction {
  width: 1200px;
  height: 1580.82px;
  margin: 0 auto;
  position: relative;
  margin-top: -100px;
  background: url('../img/ds-img/方案介绍2.png');
  background-color: #fff;
  /* border: 0.5px solid #ccc; */
  box-shadow: 0px 0px 10px #ccc;
  border-radius: 10px;
}

.introduction a {
  position: absolute;
  top: 1.5%;
  left: 3%;
  color: rgb(59, 114, 255);
  font-family: "思源黑体";
  font-size: 20px;
  font-weight: 400;
  line-height: 29px;
  letter-spacing: 0px;
  text-align: center;
}

/* 底部信息 */
.footerpage {
  margin-top: 50px;
}