/* Popup overlay */
#flipPopup{
  display:none;
  position:fixed;
  inset:0;
  width:100vw;
  height:100vh;
  background:rgba(0,0,0,0.9);
  justify-content:center;
  align-items:center;
  z-index:9999;
}

/* Open state */
#flipPopup.is-open{
  display:flex;
}

/* Inner container */
.flipInner{
  width:90%;
  max-width:900px;
  height:90vh;
  background:#000;
  padding:10px;
  box-sizing:border-box;
  display:flex;
  flex-direction:column;
  position:relative;
}

/* Close button */
#flipClose{
  position:absolute;
  top:10px;
  right:15px;
  color:#fff;
  font-size:28px;
  cursor:pointer;
  line-height:1;
  z-index:2;
}

/* Toolbar */
#flipToolbar{
  display:flex;
  justify-content:flex-end;
  gap:10px;
  margin-bottom:10px;
  flex:0 0 auto;
  z-index:1;
}

#flipToolbar button{
  padding:6px 12px;
  font-size:16px;
  cursor:pointer;
}

/* Viewport wrapper */
#flipViewport{
  flex:1;
  min-height:0;
  display:flex;
  align-items:center;
  justify-content:center;
  overflow:hidden;
  background:#333;
  transform-origin:center center;
}

/* Flipbook container */
#flipContainer{
  display:flex;
  align-items:center;
  justify-content:center;
}

/* Ensure pages fully fit */
#flipContainer .page{
  width:100%;
  height:100%;
}

#flipContainer .page img{
  width:100%;
  height:100%;
  object-fit:contain;
  display:block;
}