/* 主样式文件 */
html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1 0 auto;
}

footer {
    flex-shrink: 0;
}

/* 登录页样式 */
.login-container {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 自定义 Card 阴影效果 */
.card {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.3s ease-in-out;
}

.card:hover {
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* 表格样式优化 */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* 导航栏激活项样式 */
.navbar-nav .nav-item .nav-link.active {
    font-weight: bold;
    position: relative;
}

.navbar-nav .nav-item .nav-link.active:after {
    content: '';
    position: absolute;
    width: 80%;
    height: 2px;
    background-color: #5a67d8;
    bottom: 0;
    left: 10%;
}

/* 导航栏悬浮下拉菜单样式 */
@media (min-width: 992px) {
    .navbar-nav .dropdown:hover .dropdown-menu {
        display: block;
        margin-top: 0;
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        transition: all 0.3s ease;
    }

    .navbar-nav .dropdown-menu {
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all 0.3s ease;
        margin-top: 0;
        border: none;
        border-radius: 8px;
        box-shadow: 0 8px 25px rgba(0,0,0,0.15);
        padding: 0.5rem 0;
    }

    .navbar-nav .dropdown-item {
        padding: 0.5rem 1.5rem;
        transition: all 0.2s ease;
        border-left: 3px solid transparent;
    }

    .navbar-nav .dropdown-item:hover {
        background-color: #f8f9fa;
        border-left-color: #007bff;
        padding-left: 1.75rem;
    }

    .navbar-nav .dropdown-toggle::after {
        transition: transform 0.3s ease;
    }

    .navbar-nav .dropdown:hover .dropdown-toggle::after {
        transform: rotate(180deg);
    }
    
    /* 子菜单样式 */
    .dropdown-submenu {
        position: relative;
    }
    
    .dropdown-submenu .dropdown-menu {
        top: 0;
        left: 100%;
        margin-top: -1px;
        display: none;
    }
    
    .dropdown-submenu:hover > .dropdown-menu {
        display: block;
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .dropdown-submenu > .dropdown-item:after {
        display: block;
        content: " ";
        float: right;
        width: 0;
        height: 0;
        border-color: transparent;
        border-style: solid;
        border-width: 5px 0 5px 5px;
        border-left-color: #ccc;
        margin-top: 5px;
        margin-right: -10px;
    }
    
    .dropdown-submenu:hover > .dropdown-item:after {
        border-left-color: #007bff;
    }
} 

/* 子菜单移动端样式 */
@media (max-width: 991.98px) {
    .dropdown-submenu .dropdown-menu {
        margin-left: 1rem;
        border-left: 2px solid #007bff;
    }
    
    .dropdown-submenu .dropdown-item {
        padding-left: 1.5rem;
    }
}