body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #fff;
}

#tree-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.tree-node {
    position: relative;
    display: inline-block;
    margin: 10px;
    padding: 5px 10px;
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.tree-node:hover {
    background-color: #e0e0e0;
}

.tree-edge {
    position: absolute;
    width: 2px;
    background-color: #ccc;
}

.tree-node.selected {
    background-color: #a0d3ff;
    border-color: #007bff;
}

.edit-modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: white;
    border: 1px solid #ccc;
    border-radius: 5px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.edit-modal.active {
    display: block;
}

.edit-modal input {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
}

.edit-modal button {
    padding: 8px 12px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.edit-modal button:hover {
    background-color: #0056b3;
}

.export-import {
    margin: 20px;
    padding: 10px;
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.export-import button {
    margin-right: 10px;
}