body {
    font-family: Arial, sans-serif;
    background-color: #000;
    color: #fff;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}
button, select, label {
    margin: 10px;
}
#mindmap-container {
    width: 100%;
    height: 80vh;
    background-color: #222;
}
.node {
    border: 1px solid #fff;
    padding: 10px;
    border-radius: 5px;
    background-color: #333;
    color: #fff;
}
.node:hover {
    background-color: #555;
}
.node .title {
    font-weight: bold;
}
svg {
    width: 100%;
    height: 100%;
}
.link {
    fill: none;
    stroke: #555;
    stroke-width: 1.5px;
}
.node-title {
    cursor: pointer;
    color: #00f;
}
.node-details {
    margin-left: 20px;
}
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.8);
}
.modal-content {
    background-color: #fefefe;
    margin: 5% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 90%;
    max-width: 600px;
    color: #000;
}
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}
.close:hover,
.close:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
}