/* 全局样式 */
body {
    font-family: 'Microsoft YaHei', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
}

/* 侧边栏样式 */
.sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    padding: 48px 0 0;
    box-shadow: inset -1px 0 0 rgba(0, 0, 0, .1);
}

.sidebar .nav-link {
    font-weight: 500;
    color: #333;
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    margin: 0.2rem 0;
}

.sidebar .nav-link:hover {
    background-color: #e9ecef;
}

.sidebar .nav-link.active {
    color: #007bff;
    background-color: #e8f0fe;
}

/* 主内容区样式 */
main {
    padding-top: 1.5rem;
}

/* 表格样式 */
.table th {
    background-color: #f8f9fa;
    font-weight: 600;
}

.table-hover tbody tr:hover {
    background-color: #f1f8ff;
}

/* 缩略图样式 */
.resource-thumbnail {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: 4px;
}

.resource-thumbnail-placeholder {
    width: 40px;
    height: 40px;
    background-color: #e9ecef;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6c757d;
}

/* 详情预览样式 */
#detail-preview {
    max-height: 300px;
    overflow: auto;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    padding: 10px;
}

#detail-preview img {
    max-width: 100%;
    max-height: 280px;
    object-fit: contain;
}

/* 限制详情预览中的缩略图尺寸 */
#detail-preview .preview-thumbnail {
    max-width: 200px;
    max-height: 200px;
    object-fit: contain;
    margin: 0 auto;
    display: block;
}

/* 分页样式 */
.pagination {
    margin-bottom: 0;
}

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

/* 按钮样式 */
.btn-action {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    margin-right: 0.25rem;
}

/* 响应式调整 */
@media (max-width: 767.98px) {
    .sidebar {
        position: static;
        height: auto;
        padding-top: 0;
    }
    
    main {
        margin-left: 0 !important;
    }
}

/* 树形结构样式 */
.category-tree {
    list-style: none;
    padding-left: 0;
}

.category-tree ul {
    list-style: none;
    padding-left: 20px;
}

.category-tree-item {
    padding: 5px 0;
}

.category-tree-toggle {
    cursor: pointer;
    margin-right: 5px;
}

/* 加载中样式 */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100px;
}

.loading::after {
    content: "";
    width: 30px;
    height: 30px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Toast提示框样式 */
.toast-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 9999;
}

.toast {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}