*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    font-family:Arial,sans-serif;
    background:#0f172a;
    display:flex;
    justify-content:center;
    align-items:center;
    min-height:100vh;
}

#game{
    background:white;
    padding:20px;
    border-radius:10px;
    text-align:center;
    width:420px;
    box-shadow:0 5px 15px rgba(0,0,0,0.2);
}

h2{
    margin-bottom:15px;
}

#info{
    font-size:18px;
    margin-bottom:15px;
}

#board{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:10px;
    margin:20px 0;
}

.card{
    height:70px;
    display:flex;
    justify-content:center;
    align-items:center;
    font-size:32px;
    background:#ddd;
    border-radius:8px;
    cursor:pointer;
    user-select:none;
    transition:0.3s;
}

.card:hover{
    background:#cbd5e1;
}

#msg{
    font-weight:bold;
    margin-top:10px;
}

#win{
    color:green;
    margin-top:10px;
    display:none;
}

#rbtn{
    margin-top:15px;
    padding:10px 20px;
    border:none;
    background:#0f172a;
    color:white;
    border-radius:5px;
    cursor:pointer;
}

#rbtn:hover{
    opacity:0.9;
}