:root {
    --primary-blue: #0056b3;
    --secondary-blue: #007bff;
    --light-blue: #e9f0ff;
    --dark-blue: #003d7c;
    --text-color: #333;
    --light-gray: #f8f9fa;
    --border-color: #dee2e6;
    --white-text: #fff;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--text-color);
    overflow-x: hidden;
    padding-top: 75px;
    /* 为固定导航栏预留空间 */
}

/* 导航栏样式改进 */
.navbar {
    background-color: #000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 15px 0;
    transition: all 0.3s ease;
}

.navbar-brand img {
    height: 40px;
}

.nav-item {
    margin: 0 5px;
    position: relative;
}

.nav-link {
    font-weight: 500;
    color: #fff !important;
    position: relative;
    padding: 10px 15px;
    display: flex;
    align-items: center;
    font-size: 16px;
    transition: all 0.2s;
}


/* 二级菜单优化 */
.dropdown-menu {
    border: none;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.15);
    border-radius: 10px;
    padding: 10px 0;
    min-width: 220px;
    top: calc(100% - 5px);
    /* 与主菜单更近 */
    margin-top: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.25s ease;
    display: block;
    /* 始终显示，但使用opacity控制 */
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    padding: 10px 20px;
    font-weight: 500;
    transition: all 0.2s;
    position: relative;
    display: flex;
    align-items: center;
    font-size: 16px;
}

.dropdown-item i {
    margin-right: 10px;
    color: var(--primary-blue);
    font-size: 14px;
    width: 20px;
    text-align: center;
}

.dropdown-item:hover,
.dropdown-item:focus {
    background-color: transparent;
    color: var(--primary-blue);
}

.dropdown-item:hover:after {
    opacity: 0;
    /* 禁用进度条效果 */
}

.dropdown-divider {
    margin: 10px 20px;
}

.footer-logo {
    height: 45px;
}
.footer-container {
    font-size: 16px;
}
.footer-container h5 {
    font-size: 20px;
}
/* 响应式调整 */
@media (max-width: 991px) {
    body {
        padding-top: 60px;
    }

    .dropdown-menu {
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        position: static;
        display: none;
    }

    .show .dropdown-menu {
        display: block;
    }

    .nav-item .dropdown-menu {
        border: none;
        margin-top: 0;
        padding-left: 30px;
        background-color: #1d5ae5;
    }

    .dropdown-item {
        color: #fff;
    }

    .dropdown-item:hover {
        color: #fff;
    }

    .dropdown-item:hover:before {
        opacity: 0;
    }

    .dropdown-item:hover {
        padding-left: 20px;
    }

}

@media (max-width: 767px) {
    .navbar {
        padding: 10px 0;
    }
}