/* General Styles */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header */
header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px;
}

/* Main Content */
main {
    width: 80%;
    margin: 20px auto;
    padding: 20px;
    background: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

/* Forms */
form {
    text-align: center;
    margin-top: 20px;
}

input[type="checkbox"] {
    margin-right: 10px;
}

/* Buttons */
button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

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

/* Dark Mode */
body.dark-mode {
    background-color: #181818;
    color: white;
}

header.dark-mode {
    background-color: #282828;
}

button.dark-mode {
    background-color: #444;
    color: white;
}

button.dark-mode:hover {
    background-color: #666;
}

/* Heatmap Canvas */
canvas#heatmapCanvas {
    display: block;
    margin: 20px auto;
    cursor: crosshair;
    border: 1px solid black;
}