:root {
    --background-color: #f0f2f5;
    --text-color: #333;
    --container-bg-color: #fff;
    --button-bg-color: #007bff;
    --button-hover-bg-color: #0056b3;
    --lotto-ball-bg-color: #3498db;
}

body.dark-mode {
    --background-color: #2c3e50;
    --text-color: #ecf0f1;
    --container-bg-color: #34495e;
    --button-bg-color: #2ecc71;
    --button-hover-bg-color: #27ae60;
    --lotto-ball-bg-color: #9b59b6;
}

body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    text-align: center;
    padding: 2rem;
    background-color: var(--container-bg-color);
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s ease;
}

#generate-btn, #theme-toggle-btn {
    margin-top: 1.5rem;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    color: #fff;
    background-color: var(--button-bg-color);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-left: 10px; /* Add some spacing */
}

#generate-btn:hover, #theme-toggle-btn:hover {
    background-color: var(--button-hover-bg-color);
}

.lotto-ball {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    font-weight: bold;
    color: #fff;
    background-color: var(--lotto-ball-bg-color); /* Use CSS variable */
}