:root {
    --background-color: #f0f0f0;
    --text-color: #333;
    --primary-color: #4CAF50;
    --white: #fff;
    --ball-color: #FFC107;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
}

h1 {
    margin-bottom: 2rem;
}

#lotto-sets {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.lotto-ball {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--ball-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

#generate-btn {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 1rem 2rem;
    font-size: 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#generate-btn:hover {
    background-color: #45a049;
}