:root {
    --primary-color: #4a90e2;
    --background-color: #f0f4f8;
    --font-family: 'Arial', sans-serif;
}

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

.container {
    text-align: center;
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

h1 {
    color: var(--primary-color);
}

.numbers-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 2rem 0;
}

.number {
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: bold;
}

#generate-btn {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#generate-btn:hover {
    background-color: #357abd;
}