*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Arial,Helvetica,sans-serif;
}

body{
    background:linear-gradient(135deg,#6a11cb,#2575fc);
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
}

.container{
    width:95%;
    max-width:650px;
    background:#fff;
    border-radius:25px;
    padding:30px;
    text-align:center;
    box-shadow:0 10px 30px rgba(0,0,0,.3);
}

h1{
    color:#2575fc;
    margin-bottom:10px;
}

.top-bar{
    display:flex;
    justify-content:space-between;
    margin:20px 0;
    font-size:20px;
    font-weight:bold;
}

#numberDisplay{
    margin:35px 0;
    font-size:50px;
    letter-spacing:8px;
    color:#2575fc;
    min-height:70px;
}

input{
    width:100%;
    padding:15px;
    font-size:26px;
    text-align:center;
    border:2px solid #2575fc;
    border-radius:12px;
    outline:none;
}

button{
    padding:15px 35px;
    border:none;
    border-radius:50px;
    background:linear-gradient(45deg,cyan,magenta);
    font-size:18px;
    font-weight:bold;
    cursor:pointer;
    margin-top:15px;
}

button:hover{
    transform:scale(1.05);
}

#message{
    margin-top:25px;
    min-height:40px;
    color:#2575fc;
    font-size:22px;
    font-weight:bold;
}