header {
  width: 100%;
  background: c
  background-image: -webkit-linear-gradient(
    0deg,
    rgb(241, 94, 14) 0%,
    rgb(247, 146, 33) 100%
  );
}
.header-top {
  width: 1540px;
  height: 40px;
  padding: 0 50px;
  box-sizing: border-box;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-end;
  color: #fff;
  font-size: 16px;
}
.search_btn {
  margin-right: 50px;
  margin-left: 18px;
}

.search_btn svg {
  display: inline-block;
  fill: #fff;
  width: 18px;
  height: 18px;
  vertical-align: middle;
  margin: -3px 0 0;
}

.header-logo {
  width: 1440px;
  height: 100px;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  box-sizing: border-box;
  padding: 0 50px;
  margin: 0 auto;
  background-color: #c285df;
}
.header-logo img {
  margin-right: 20px;
}
.header-logo p {
  font-size: 24px;
  font-weight: bold;
  font-family: Arial, "Microsoft Yahei", Helvetica, sans-serif;
}
.header-logo p:nth-child(1) {
  letter-spacing: 45px;
}
.header-nav {
  width: 100%;
  height: 35px;
  background: #fff;
  transition: all 0.3s ease;
}

.header-nav.fixed {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
}
.header-nav ul {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-around;
  width: 1200px;
  margin: 0 auto;
}

.header-nav ul li a {
  font-size: 16px;
  line-height: 35px;
  color: #333;
  font-family: simsun;
  font-weight: bold;
}

.header-nav ul li a:hover {
  color: #c285df;
}
.header-nav ul li:nth-child(1) a {
  color: #c285df;
}