body {
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
    color: #333;
    margin: 0;
    padding: 0;
}

.roadmap {
    max-width: 800px;
    margin: 50px auto;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #01b2db;
}

.node h2 {
    font-size: 1.5em;
    margin: 10px 0;
    cursor: pointer;
    background-color: #01b2db;
    color: white;
    padding: 10px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.node h2:hover {
    background-color: #028bb5;
}

.node ul {
    margin: 0;
    padding: 0 20px;
    list-style-type: none;
}

.node ul li {
    margin: 5px 0;
}

.node h3 {
    font-size: 1.2em;
    color: #01b2db;
}

.hidden {
    display: none;
}