body {
    font-family: Arial, sans-serif;
    background-color: #1a1a1a;
    color: #ffffff;
    margin: 0;
    padding: 0;
}

header {
    background: #333;
    padding: 20px;
    text-align: center;
}

nav a {
    margin: 0 10px;
    text-decoration: none;
    color: #00ff00;
}

nav a:hover {
    color: #ff00ff;
}

main {
    padding: 20px;
}

h1, h2 {
    color: #00ff00;
}

#pre-placed-nodes {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
}

#network-container {
    width: 100%;
    height: 600px;
    background: #222;
    border: 1px solid #555;
    position: relative;
}

.node {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
}

.node.input {
    background: #00ff00;
    position: absolute;
    left: 0;
}

.node.hidden {
    background: #0000ff;
    position: absolute;
    left: 50px;
}

.node.output {
    background: #ff0000;
    position: absolute;
    left: 100px;
}

.node.clear {
    background: #000000;
    position: absolute;
    left: 150px;
}

.link {
    position: absolute;
    height: 2px;
    background: #00ff00;
    transform-origin: 0 0;
}

.node-label {
    color: #ffffff;
    font-size: 12px;
    text-align: center;
    position: absolute;
    width: 100%;
    top: -20px;
}
