html, body {
margin:0;
padding:0;
height:100%;
overflow:hidden;
font-family:Arial;
}

#gameContainer {
position:fixed;
width:100vw;
height:100vh;
background-size:cover;
background-position:center;
}

#ui{
position:fixed;
bottom:20px;
left:20px;
z-index:20;
width:120px;
padding:8px;
background:#fff8dc;
border:1px solid #d2b48c;
border-radius:8px;
box-shadow:0 0 8px rgba(0,0,0,0.4);
}

#targetImage{
width:100%;
margin-bottom:4px;
}

#instruction{
font-size:10px;
margin:3px 0;
}

#timer{
font-size:40px;
font-weight:bold;
text-align:center;
transition:0.2s;
}

.piece{
position:absolute;
width:110px;
cursor:pointer;
transition:0.2s;
}

.piece:hover{
transform:scale(1.15);
}

/* POPUP */
#popup{
position:fixed;
top:0;
left:0;
width:100%;
height:100%;
background:rgba(0,0,0,0.7);
display:flex;
justify-content:center;
align-items:center;
z-index:999;
}

.popup-content{
background:white;
padding:15px;
border-radius:12px;
text-align:center;
width:90%;
max-width:340px;
}

.popup-img{
width:100%;
margin-bottom:10px;
}

.popup-content input{
width:100%;
padding:10px;
margin:5px 0;
font-size:16px;
box-sizing:border-box;
}

.popup-content button{
width:100%;
padding:12px;
margin-top:8px;
font-size:16px;
background:#28a745;
color:white;
border:none;
border-radius:6px;
}

/* móvil */
@media(max-width:600px){

.piece{
width:80px;
}

#ui{
width:100px;
}

#timer{
font-size:32px;
}

.popup-content{
width:95%;
}
}