*{
    margin: 0;
    padding: 0;
}
html,body{
    height: 100%;
}
#container{
    /*保证footer是相对于container位置绝对定位*/
    position:relative;
    width:100%;
    min-height:100%;
    /*设置padding-bottom值大于等于footer的height值，以保证main的内容能够全部显示出来而不被footer遮盖；*/
    padding-bottom: 100px;
    box-sizing: border-box;
}
#header{
    width: 100%;
}
.main{
    width: 100%;
    min-height: 100%;
    padding: 0 0 100px 0;
}
#footer{
    width: 100%;
    height:100px;   /* footer的高度一定要是固定值*/
    position:absolute;
    bottom:0;
    left:0;
    background: #333;
}
.flex-center{
    display: flex;
    justify-content: center;
    align-items: center;
}

.advantage-title {
    margin-bottom: 2rem;
}

.advantage-circle {
    position: relative;
    width: 400px;
    height: 300px;
    margin: 0 auto;
}

.center-circle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(135, 206, 235, 0.7);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.circle-wrapper {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 2px solid rgba(135, 206, 235, 0.3);
    border-radius: 50%;
}

.circle-group {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 15px;
}

.circle-item {
    width: 80px;
    height: 70px;
    border-radius: 50%;
    background: rgba(135, 206, 235, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid rgba(135, 206, 235, 0.3);
    position: relative;
}

.fas-globe{
    height: 50%;
    width: 50%;
    object-fit: contain;
}

.circle-content {
    text-align: left;
    width: 180px;
    position: absolute;
}

.top-left {
    top: 0;
    left: 0;
    transform: translate(-50%, -50%) rotate(-45deg);
}

.top-right {
    top: 0;
    right: 0;
    transform: translate(50%, -50%) rotate(45deg);
}

.bottom-left {
    bottom: 0;
    left: 0;
    transform: translate(-50%, 50%) rotate(45deg);
}

.bottom-right {
    bottom: 0;
    right: 0;
    transform: translate(50%, 50%) rotate(-45deg);
}

.circle-item i {
    font-size: 24px;
    color: #333;
    transform: rotate(45deg);
}

.circle-content h4 {
    margin-bottom: 5px;
}

.circle-content p {
    font-size: 14px;
    line-height: 1.4;
}

.top-right .circle-content,
.bottom-right .circle-content {
    text-align: left;
    order: 1;
    left: 100%;
    margin-left: 20px;
}

.advantage-circle::after {
    display: none;
}

.top-left .circle-content,
.bottom-left .circle-content {
    right: 100%;
    margin-right: 20px;
}

.top-right .circle-content {
    transform: rotate(-45deg);
}

.bottom-left .circle-content {
    transform: rotate(-45deg);
}

.bottom-right .circle-content {
    transform: rotate(45deg);
}

.top-right .circle-item i,
.bottom-left .circle-item i {
    transform: rotate(-45deg);
}

.main-menu li a {
    position: relative;
    text-decoration: none;
    color: #333;
    font-size: 16px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.main-menu li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 30%;
    left: 0;
    background-color: #87CEEB;  /* 天蓝色，可以根据需要调整 */
    transition: width 0.3s ease-in-out;
}

.main-menu li a:hover {
    color: #87CEEB;
}

.main-menu li a:hover::after {
    width: 100%;
}

/* 当前活动页面的样式 */
.main-menu li.active a {
    color: #87CEEB;
}

.main-menu li.active a::after {
    width: 100%;
}