body {
    background-color: #e0e0e0;
    font-family: sans-serif;
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.control-panel {
    background-color: #f9f9f9;
    padding: 10px 20px;
    border-radius: 50px;
    display: flex;
    gap: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 10px;
    border: 1px solid #ccc;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-group input, .input-group select {
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
    width: 80px;
    text-align: right;
}

.action-panel {
    margin-bottom: 20px;
}

#start-btn {
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
    padding: 10px 40px;
    border-radius: 5px;
    font-size: 1.2rem;
    cursor: pointer;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#start-btn:hover {
    background-color: #c3e6cb;
}

.visualization-container {
    display: flex;
    gap: 20px;
    width: 100%;
    max-width: 1200px;
    justify-content: center;
}

.card {
    background-color: white;
    border-radius: 15px;
    padding: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 48%;
    height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid #aaa;
}

#plotly-div, #observable-div {
    width: 100%;
    height: 100%;
}