/* Basic styling for the heat map generator */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 1rem;
    background-color: #f6f8fa;
    color: #333;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

header {
    max-width: 800px;
    margin-bottom: 1rem;
    text-align: left;
}

h1 {
    margin: 0.5rem 0;
    font-size: 1.6rem;
}

p {
    line-height: 1.5;
    margin: 0.5rem 0 1rem 0;
    font-size: 0.95rem;
}

#controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

#controls label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#controls input[type=range] {
    width: 150px;
}

#controls button {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    background-color: #0074d9;
    color: white;
    transition: background-color 0.2s ease;
}

#controls button:hover {
    background-color: #005fa3;
}

#canvasWrapper {
    /* Allow the canvas to expand beyond the viewport; scrollbars appear
       automatically when zooming in.  We do not constrain the width so
       that the canvas can grow when the zoom factor increases. */
    width: 100%;
    margin-bottom: 1rem;
    overflow: auto;
}

canvas {
    /* The canvas size is controlled via JavaScript.  Leave width/height
       unset here to allow the script to specify explicit dimensions. */
    border: 1px solid #ccc;
    background-color: white;
    display: block;
}

footer {
    max-width: 800px;
    font-size: 0.85rem;
    text-align: center;
    color: #555;
    margin-top: 1rem;
}