/* 全局样式 */
body {
    background-color: #f8f9fa;
    color: #333;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.5;
}

a {
    color: #007bff;
    text-decoration: none;
}

a:hover {
    color: #0056b3;
    text-decoration: underline;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    margin-bottom: 1rem;
}

.navbar-brand {
    font-weight: 600;
}

.main-container {
    padding: 20px 0;
    min-height: calc(100vh - 180px);
}

.footer {
    padding: 20px 0;
    margin-top: 40px;
    background-color: #f1f1f1;
    border-top: 1px solid #e9ecef;
}

.footer p {
    margin-bottom: 0;
}

/* 按钮样式 */
.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
}

.btn-primary:hover {
    background-color: #0069d9;
    border-color: #0062cc;
}

/* 卡片样式 */
.card {
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid #f5f5f5;
    font-weight: 500;
}

/* 表单样式 */
.form-control:focus {
    border-color: #80bdff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* 列表组样式 */
.list-group-item {
    border-color: #f5f5f5;
}

.list-group-item:hover {
    background-color: #f8f9fa;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .container {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    .card-body {
        padding: 15px;
    }
}

/* 添加二级下拉菜单支持 */
.dropdown-submenu {
    position: relative;
}

.dropdown-submenu > .dropdown-menu {
    top: 0;
    left: 100%;
    margin-top: -6px;
    margin-left: -1px;
}

.dropdown-submenu:hover > .dropdown-menu {
    display: block;
}

.dropdown-submenu > a: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 > a:after {
    border-left-color: #fff;
}