body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f2f5;
    color: #333;
}
.container {
    text-align: center;
    background-color: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}
h1 {
    margin-bottom: 20px;
    color: #1a73e8;
}
#numbers-display {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 30px 0;
}
.number-circle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 28px;
    font-weight: bold;
    position: relative;
    box-shadow: inset -5px -5px 10px rgba(0,0,0,0.3), 0 5px 10px rgba(0,0,0,0.2);
}
.number-circle::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 10px;
    width: 20px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    transform: rotate(-45deg);
}
button {
    padding: 12px 24px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    border-radius: 8px;
    background-color: #1a73e8;
    color: white;
    transition: background-color 0.3s ease;
}
button:hover {
    background-color: #155ab6;
}