.tree-view{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;font-size:14px;line-height:1.5;color:#333;-webkit-user-select:none;user-select:none}.tree-node{margin:2px 0;position:relative}.node-content{display:flex;align-items:center;padding:4px 8px;border-radius:4px;cursor:pointer;transition:background-color .2s}.node-content:hover{background-color:#f5f5f5}.node-toggle{display:flex;align-items:center;justify-content:center;width:20px;color:#666;margin-right:4px}.node-label{flex:1;padding:2px 0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.node-actions{display:flex;opacity:0;transition:opacity .2s;margin-left:8px}.node-content:hover .node-actions{opacity:1}.node-actions button{background:none;border:none;color:#666;cursor:pointer;display:flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:3px;padding:0;margin:0 2px}.node-actions button:hover{color:#1890ff;background-color:#e6f7ff}.node-children{margin-left:16px;border-left:1px dashed #e0e0e0;padding-left:8px}.add-node-form{margin:4px 0;padding:0 8px}.add-node-form input{width:100%;padding:4px 8px;border:1px solid #d9d9d9;border-radius:4px;font-size:13px;outline:none}.add-node-form input:focus{border-color:#1890ff;box-shadow:0 0 0 2px #1890ff33}.dragging{opacity:.5;background-color:#f0f0f0}.drop-target{background-color:#e6f7ff;border:1px dashed #1890ff}.node-children-enter{opacity:0;transform:translateY(-10px)}.node-children-enter-active{opacity:1;transform:translateY(0);transition:opacity .2s,transform .2s}.node-children-exit{opacity:1;transform:translateY(0)}.node-children-exit-active{opacity:0;transform:translateY(-10px);transition:opacity .2s,transform .2s}:root{--primary-color: #1890ff;--text-color: #333;--bg-color: #fff;--border-color: #e0e0e0;--hover-bg: #f5f5f5;--shadow-color: rgba(0, 0, 0, .1)}[data-theme=dark]{--primary-color: #177ddc;--text-color: #e0e0e0;--bg-color: #1f1f1f;--border-color: #444;--hover-bg: #2a2a2a;--shadow-color: rgba(0, 0, 0, .3)}*{margin:0;padding:0;box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--bg-color);color:var(--text-color);transition:background-color .3s,color .3s}.app{display:flex;flex-direction:column;min-height:100vh;max-width:1200px;margin:0 auto;padding:0 20px}.app-header{display:flex;justify-content:space-between;align-items:center;padding:20px 0;border-bottom:1px solid var(--border-color);margin-bottom:30px}.app-header h1{font-size:24px;font-weight:600;color:var(--primary-color)}.controls{display:flex;gap:10px}.button{padding:8px 16px;background-color:var(--primary-color);color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:14px;transition:background-color .2s;display:flex;align-items:center;gap:6px}.button:hover{background-color:#40a9ff}.app-content{display:flex;flex:1;gap:40px;padding-bottom:40px}.tree-container{flex:1;background-color:var(--bg-color);border:1px solid var(--border-color);border-radius:8px;padding:20px;box-shadow:0 2px 8px var(--shadow-color);height:fit-content;max-width:600px}.instructions{flex:1;max-width:400px;padding:20px;background-color:var(--bg-color);border:1px solid var(--border-color);border-radius:8px;box-shadow:0 2px 8px var(--shadow-color);height:fit-content}.instructions h2{margin-bottom:16px;color:var(--primary-color)}.instructions ul{padding-left:20px}.instructions li{margin-bottom:10px;line-height:1.5}.icon{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;background-color:var(--border-color);border-radius:3px;margin:0 4px;font-size:12px}.app-footer{text-align:center;padding:20px 0;margin-top:auto;border-top:1px solid var(--border-color);color:#666;font-size:14px}.theme-toggle{background:none;border:none;color:var(--text-color);cursor:pointer;font-size:20px;padding:8px;border-radius:50%;transition:background-color .2s}.theme-toggle:hover{background-color:var(--hover-bg)}@media (max-width: 768px){.app-content{flex-direction:column}.tree-container,.instructions{max-width:100%}.app-header{flex-direction:column;gap:15px;text-align:center}.controls{width:100%;justify-content:center}}