.category-tree-container{max-width:100%;margin:20px 0}.category-tree-section{margin-bottom:15px;border:1px solid #ddd;border-radius:4px;overflow:hidden}.category-tree-header{background-color:#f7f7f7;padding:15px;cursor:pointer;font-weight:600;font-size:16px;display:flex;justify-content:space-between;align-items:center;user-select:none;transition:background-color .3s ease}.category-tree-header:hover{background-color:#ececec}.category-tree-header.active{background-color:#e0e0e0}.category-tree-header.active .category-tree-toggle{transform:rotate(180deg)}.category-tree-toggle{font-size:14px;display:inline-block;transition:transform .3s ease}.category-tree-content{display:none;background-color:#fff;padding:15px}.category-tree-list{list-style:none;padding-left:0;margin:0}.category-tree-list ul{list-style:none;padding-left:25px;margin:10px 0}.category-tree-item{padding:8px 0;border-bottom:1px solid #f0f0f0}.category-tree-item:last-child{border-bottom:none}.category-tree-item a{text-decoration:none;color:#333;display:inline-block;transition:color .2s ease}.category-tree-item a:hover{color:#43a081}.category-tree-item.has-children>a{font-weight:500}.category-tree-item.hidden-item{display:none}.category-count{color:#999;font-size:.9em;margin-left:5px}.show-more-btn{border:none;cursor:pointer;font-family:inherit;display:inline-block;margin-top:15px;padding:10px 20px;background-color:#43a081;color:#fff;border-radius:4px;font-size:14px;transition:background-color .3s ease}.show-more-btn:hover{background-color:#368a6b}.show-more-btn:focus{outline:2px solid #43a081;outline-offset:2px}.show-more-btn.hidden{display:none}.category-tree-error,.category-tree-empty{padding:10px;color:#999;font-style:italic}.category-tree-error{color:#dc3545}