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

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

.container{
width:95%;
max-width:420px;
background:rgba(255,255,255,.12);
padding:20px;
border-radius:20px;
backdrop-filter:blur(10px);
text-align:center;
}

h1{
margin-bottom:10px;
}

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

#game-board{
display:grid;
grid-template-columns:repeat(4,75px);
gap:10px;
justify-content:center;
margin:20px auto;
}

.card{
width:75px;
height:75px;
background:#ffffff33;
border-radius:12px;
display:flex;
justify-content:center;
align-items:center;
font-size:34px;
cursor:pointer;
user-select:none;
transition:.3s;
}

.card.flipped{
background:#fff;
}

.buttons{
margin-top:15px;
}

button{
padding:10px 20px;
border:none;
border-radius:8px;
cursor:pointer;
font-size:16px;
}

button:hover{
opacity:.9;
}

#status{
margin-top:15px;
}

.popup{
position:fixed;
top:0;
left:0;
width:100%;
height:100%;
background:rgba(0,0,0,.7);
display:none;
justify-content:center;
align-items:center;
}

.popup-box{
background:#fff;
color:#222;
padding:25px;
border-radius:15px;
text-align:center;
width:300px;
}

.popup-box button{
margin-top:15px;
width:100%;
}