/* 导航条 */
.header {
    background: #fff;
    width: 100%;
    border-bottom: 3px solid #22407e;
}

.header .container {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    position: relative;
}

.header .logo {
    display: flex;
    flex-direction: row;
    align-items: center;
}

.header .logo img {
    height: 40px;
}

.header .logo .website-name {
    font-size: 24px;
    color: #1D428A;
    margin: 0 16px;
}

.nav {
    flex: 1;
    display: flex;
    align-items: center;
    margin-left: 80px;
}

.nav-menu {
    flex: 1;
    display: flex;
    justify-content: space-around;
}

.nav-menu li {
    margin: 0 10px;
}

.nav-menu li a {
    font-size: 16px;
    color: #565656;
    text-decoration: none;
    padding: 12px 0;
    position: relative;
}

.nav-menu li a:hover,
.nav-menu li a.selected {
    color: #2552ac;
}

.nav-menu li a:hover::after,
.nav-menu li a.selected::after {
    width: 100%;
}

.contact-btn {
    margin-left: 20px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1D428A;
    color: #fff;
    padding: 6px 20px;
    border-radius: 3px;
    border: 1px solid #1D428A;
    font-size: 14px;
    text-decoration: none;
}

.contact-btn:hover {
    background: #fff;
    color: #1D428A;
}

.nav-toggle {
    display: none;
    /* 默认隐藏 */
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    margin-right: 5px;
}

.nav-toggle svg {
    width: 24px;
    height: 24px;
}

/* 响应式布局 */
@media (max-width: 768px) {
    .header .container {
        padding: 0 16px;
    }

    /*
    .header .logo {
        display: none;
    }*/

    .header .logo img {
        content: url('../images/logo_mini.webp')
    }

    .header .logo .website-name {
        font-size: 22px;
        margin: 0 0 0 5px;
    }

    .header .container .nav {
        display: none;
    }

    .header .container .nav.show {
        display: flex;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: #fff;
        flex-direction: column;
        z-index: 99999;
    }

    .nav-menu {
        flex-direction: column;
        /* 垂直排列 */
        align-items: center;
        /* 居中对齐 */
    }

    .nav-menu li {
        margin: 10px 0;
        /* 调整间距 */
    }

    .nav-toggle {
        display: flex;
    }
}