body{
font-family:Arial;
margin:0;
background:#f4f4f4;
}

header{
background:#111;
color:white;
text-align:center;
padding:15px;
}

.tabs{
display:flex;
justify-content:center;
background:#222;
}

.tab{
padding:12px 20px;
border:none;
background:none;
color:white;
cursor:pointer;
}

.tab.active{
background:#007bff;
}

.tab-panel{
display:none;
padding:20px;
}

.tab-panel.active{
display:block;
}

.upload-box{
border:2px dashed #999;
background:white;
padding:25px;
text-align:center;
margin-bottom:20px;
}

#previewContainer{
display:grid;
grid-template-columns:repeat(auto-fill,minmax(160px,1fr));
gap:15px;
}

.page{
background:white;
padding:10px;
border-radius:6px;
box-shadow:0 2px 5px rgba(0,0,0,0.1);
}

.page canvas{
width:100%;
}

.page-controls{
display:flex;
flex-wrap:wrap;
gap:4px;
justify-content:center;
margin-top:5px;
}

.page-controls button{
border:none;
background:#eee;
padding:5px;
cursor:pointer;
}

.main-btn{
display:block;
margin:20px auto;
padding:12px 25px;
background:#007bff;
color:white;
border:none;
font-size:16px;
cursor:pointer;
}

.controls{
display:grid;
grid-template-columns:1fr 1fr;
gap:10px;
margin-top:15px;
}

#imagePreview{
max-width:100%;
margin-top:10px;
}