body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f7f7f7;
    color: #333;
}

.container {
    text-align: center;
    background: #fff;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

h1 {
    margin-bottom: 30px;
    font-size: 2.5em;
    color: #333;
}

.numbers-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
}

.number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: #eee;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8em;
    font-weight: bold;
    color: #333;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, background-color 0.3s ease;
}

#generate-btn {
    padding: 15px 35px;
    font-size: 1.2em;
    font-weight: bold;
    color: #fff;
    background-color: #007aff;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 15px rgba(0, 122, 255, 0.4);
}

#generate-btn:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

#generate-btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 10px rgba(0, 122, 255, 0.4);
}