* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

body {
    display: flex;
    height: 100vh;
}

label {
    font-weight: bold;
}

select,
input,
button {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}

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

canvas {
    max-width: 100%;
    height: auto;
}

.sidebar {
    width: 250px;
    background: #f4f4f4;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.sidebar h2 {
    text-align: left;
    margin-bottom: 10px;
}

.error-message {
    color: red;
    font-size: 14px;
    display: none;
    text-align: center;
}

.main-content {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.options {
    gap: 15px;
    display: flex;
    flex-direction: column;
}

.options.hidden {
    display: none;
}