*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:Segoe UI;
}

body{
background:#0f172a;
color:white;
display:flex;
justify-content:center;
padding:40px;
}

.container{
width:100%;
max-width:900px;
}

h1{
text-align:center;
margin-bottom:10px;
}

.subtitle{
text-align:center;
color:#94a3b8;
margin-bottom:25px;
}

.card{
background:#1e293b;
padding:20px;
margin-bottom:20px;
border-radius:15px;
box-shadow:0 0 20px rgba(0,0,0,.3);
}

#stoneCount{
font-size:80px;
font-weight:bold;
text-align:center;
color:#38bdf8;
margin:20px 0;
}

#status{
text-align:center;
font-size:20px;
margin-bottom:20px;
}

.controls{
display:flex;
justify-content:center;
gap:10px;
flex-wrap:wrap;
}

button{
border:none;
padding:12px 20px;
border-radius:10px;
cursor:pointer;
background:#38bdf8;
color:white;
font-size:16px;
}

button:hover{
opacity:.9;
}

select{
width:100%;
padding:10px;
margin-top:10px;
margin-bottom:15px;
border-radius:8px;
border:none;
}

.restart{
width:100%;
padding:15px;
font-size:18px;
background:#22c55e;
}

pre{
white-space:pre-wrap;
line-height:1.5;
}