.header {
    position: fixed;
    top: 0px;
    height: 65px;
    width: 100%;
    box-sizing: border-box;
    background: none;
    transition: all 0.5s ease; /* 过渡效果 */
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    z-index: 9999;
}

.header:hover {
    background-color: black; /* 悬浮时的背景颜色 */
}

.header .logo {
    margin-right: 50px;
    height: 35px;
}

.header .logo * {
    height: 100%;
}

.header .header-content {
    width: 75vw;
    margin: auto;
    align-items: center;
    display: flex;
    height: 100%;
}

.header .menu-items {
    display: flex;
    gap: 50px;
    height: 100%;
}

.header .menu-items li {
    cursor: pointer;
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
    opacity: 0.8;

}

.header .menu-items li:hover {
    opacity: 1;
}

.header .menu-items li a {
    display: block; /* 将链接设为块级元素 */
    color: #fff; /* 设置文字颜色 */
    font-size: 16px;
    text-decoration: none; /* 去掉下划线 */
}

.header .bottom-line {
    height: 2px;
    width: 0px;
    background: red;
    position: absolute;
    transition: all 0.3s ease; /* 过渡效果 */
    bottom: 0px;
}


.banner{
    background-image: url(https://www.csqixiang.com/img/wallpaper1_1.jpg);
    background-size: cover;
    background-position: center;
    width: 100%;
    background-repeat: no-repeat;
    height: 100vh;
}


footer {
    width: 100%;
    box-sizing: border-box;
    height: 100%;
}

footer .footer {
    width: 75vw;
    margin: auto;
    box-sizing: border-box;
    padding: 30px 0px 30px;
}

footer .footer .company-info {
    border-bottom: 1px solid rgba(0, 0, 0, 0.2);
    padding: 50px 0px ;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

footer .footer .company-info .logo {
    height: 45px;
}

footer .footer .company-info .logo * {
    height: 100%;
}

footer .footer .company-info .contact-info {
    font-size: 38px;
    color: black;
    font-weight: bold;
}

footer .footer-section-items {
    display: flex;
    flex-wrap: wrap;
    gap: 80px;
    margin-top: 30px;
}

footer .footer-section-items .footer-section-item p{
    color: black;
    font-size: 20px;
    margin: 5px 0px 10px;
    font-weight: bold;
}

footer .footer-section-items .footer-section-item ul li{
    margin-bottom: 8px;
    font-size: 14px;
    color: black;
    cursor: pointer;
}