:root {
  --main-color: #3fc3c7;
}
.main {
  width: 640px;
  margin: 0 auto;
}
.main .wrap {
  width: 620px;
  margin: 0 auto;
}
.main .head .logo {
  width: 620px;
  padding-top: 20px;
  padding-bottom: 30px;
  background-color: #fff;
  margin: 0 auto;
}
.main .head .top-form {
  width: 620px;
  height: 40px;
  margin: 0 auto;
  padding-bottom: 25px;
  display: flex;
  justify-content: space-between;
}
.main .head .top-form input {
  width: 298px;
  height: 38px;
  border: 1px solid #b3b3b3;
  font-size: 21px;
  text-indent: 7px;
}
.main .head .top-form a {
  display: block;
  width: 148px;
  height: 40px;
  background-color: #ef9844;
  border-radius: 20px;
  font-size: 21px;
  color: #fff;
  text-align: center;
  line-height: 40px;
}
.main .head .top-form a:nth-of-type(2) {
  background-color: var(--main-color);
}
.main .head .top-nav {
  width: 620px;
  margin: 0 auto;
  padding-bottom: 22px;
  display: flex;
  justify-content: space-between;
}
.main .head .top-nav li {
  position: relative;
}
.main .head .top-nav li a {
  font-size: 24px;
}
.main .head .top-nav li.nav-active a {
  color: var(--main-color);
}
.main .head .top-nav li.nav-active a:after {
  position: absolute;
  content: "";
  display: block;
  width: 100%;
  height: 2px;
  background-color: #008b93;
  bottom: -3px;
  left: 50%;
  margin-left: -50%;
}