html,
body {
  width: 100%;
  height: 100%;
}
/* 头部 */
.header {
  width: 100%;
  height: 140px;
  background: #005555;
}
.header-container {
  width: 1500px;
  height: 100%;
  margin: 0 auto;
}
.header-container-box {
  width: 100%;
  height: 42px;
  padding: 29px 0 19px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.header-title {
  width: 520px;
  height: 42px;
  font-size: 40px;
  font-weight: 400;
  line-height: 42px;
  color: #ffffff;
  user-select: none;
  letter-spacing: 5px;
}
.header-search {
  width: 236px;
  height: 40px;
  background: #ffffff;
  opacity: 1;
  border-radius: 5px;
  display: flex;
  justify-content: space-around;
  align-items: center;
}
.search-input {
  width: 120px;
  height: 24px;
  outline: none;
  border: none;
}
.search-btn {
  width: 60px;
  height: 24px;
  line-height: 24px;
  text-align: center;
  border: none;
  outline: none;
  font-size: 16px;
  font-weight: 400;
  background-color: #227777;
  color: #fff;
}

.header-nav {
  width: 100%;
  height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
  overflow: hidden;
}
.header-nav-item {
	flex: 1 1 auto;
  /* width: 300px; */
  height: 50px;
  background: #669999;
  display: flex;
  justify-content: center;
  align-items: center;
}
.header-nav-item.nav-active {
  background: #227777;
}
.header-nav-item.nav-pk-active {
  background-color: #cc5656;
}
.header-nav-item a {
  color: #fff;
  font-size: 20px;
  letter-spacing: 5px;
}

@media screen and (max-width: 1510px) {
  .header-container {
    width: 1200px;
  }

}

@media screen and (max-width: 1210px) {
  .header-container {
    width: 1000px;
  }

}

@media screen and (max-width: 1010px) {
  .header-container {
    width: 800px;
  }

}

@media screen and (max-width: 810px) {
  .header-container {
    width: 600px;
  }

	.header-title {
		width: 400px;
		height: 42px;
		font-size: 26px;
		font-weight: 400;
		line-height: 42px;
		color: #ffffff;
		user-select: none;
		letter-spacing: 5px;
	}
	
}

@media screen and (max-width: 610px) {
  .header-container {
    width: 500px;
  }

	.header-title {
		width: 300px;
		height: 24px;
		font-size: 20px;
		font-weight: 400;
		line-height: 24px;
		color: #ffffff;
		user-select: none;
		letter-spacing: 5px;
	}

	.header-nav-item a {
		color: #fff;
		font-size: 16px;
		letter-spacing: 5px;
	}
	
}

@media screen and (max-width: 510px) {
  .header-container {
    width: 360px;
  }

	.header-title {
		width: 300px;
		height: 24px;
		font-size: 20px;
		font-weight: 400;
		line-height: 24px;
		color: #ffffff;
		user-select: none;
		letter-spacing: 5px;
	}

	.header-nav-item a {
		color: #fff;
		font-size: 16px;
		letter-spacing: 5px;
	}
	
	.header-search {
		display: none;
	}
}