.head-section {
    border-bottom:  none;
    background-color: #1A3668 0% 0% no-repeat padding-box;
		 position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s ease; /* 平滑过渡效果 */
}
.head-section .navbar-default {
background: #1a3668 0% 0% no-repeat padding-box;
}

.head-section .navbar-nav > li > a{
	color:#455c84
}
ul.dropdown-menu {
    border: none;
}

.head-section .nav li a, .head-section .nav li.active ul.dropdown-menu li a{
	color:#fff
}
.swiper {
    width: 100%;
    height: 550px;
    min-width: 520px;
    position: relative;
    margin: 0 auto;
    overflow: hidden;
}
.swiper-slide {
    text-align: center;
    font-size: 18px;
    background: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
}
.swiper-slide img {
    display: block;
    width: 100%;
    height: 100%;
}
.swiper {
    margin-left: auto;
    margin-right: auto;
}