:root{
  --bg:#111;
  --panel:#0f0f0f;
  --panel2:rgba(0,0,0,.78);
  --btn:#2a2a2a;
  --btnH:#3a3a3a;
  --txt:#eee;
  --muted:#bdbdbd;
  --radius:12px;
  --toolbar-h:56px;
  --thumbs-h:32vh; /* when open */
  --gap:12px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--txt);
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
}
.wf-shell{
  height:100vh;
  display:flex;
  flex-direction:column;
}
.wf-topbar{
  position:sticky; top:0;
  z-index:100;
  display:flex; align-items:center; gap:10px;
  padding:10px 12px;
  background:linear-gradient(to bottom, rgba(0,0,0,.92), rgba(0,0,0,.75));
  border-bottom:1px solid rgba(255,255,255,.06);
}
.wf-title{font-weight:650;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.wf-spacer{flex:1}
.wf-counter{font-size:13px;color:var(--muted)}
.wf-stage{
  position:relative;
  flex:1;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:14px 10px calc(var(--toolbar-h) + 10px);
  overflow:hidden;
}
.wf-spread{
  width:min(96vw, 1320px);
  height:100%;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:var(--gap);
  align-items:center;
}
@media (max-width: 900px){
  .wf-spread{grid-template-columns:1fr}
}
.wf-page{
  height:100%;
  background:#fff;
  border-radius:10px;
  overflow:auto; /* enables pan when zoomed */
  box-shadow:0 14px 36px rgba(0,0,0,.35);
  display:flex;
  align-items:center;
  justify-content:center;
}
.wf-page img{
  display:block;
  max-width:100%;
  max-height:100%;
  width:auto;
  height:auto;
  object-fit:contain;
  transform-origin:center center;
  will-change:transform;
  user-select:none;
  -webkit-user-drag:none;
}
.wf-page:focus{outline:none}
.wf-hotzone{
  position:absolute;
  top:14px;
  bottom:calc(var(--toolbar-h) + 10px);
  width:18%;
  z-index:50;
  cursor:pointer;
}
.wf-hotzone.left{left:10px}
.wf-hotzone.right{right:10px}
.wf-hotzone::after{
  content:"";
  position:absolute; inset:0;
}
.wf-toolbar{
  position:fixed;
  left:0; right:0; bottom:0;
  height:var(--toolbar-h);
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:10px 12px;
  background:var(--panel2);
  border-top:1px solid rgba(255,255,255,.08);
  z-index:200;
  backdrop-filter: blur(6px);
}
.wf-btn{
  border:1px solid rgba(255,255,255,.10);
  background:var(--btn);
  color:var(--txt);
  border-radius:999px;
  height:40px;
  min-width:40px;
  padding:0 14px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  cursor:pointer;
  font-size:16px;
  line-height:1;
}
.wf-btn:hover{background:var(--btnH)}
.wf-btn:active{transform:translateY(1px)}
.wf-btn[disabled]{opacity:.5;cursor:not-allowed}
.wf-btn .wf-ico{font-size:18px}
.wf-btn.wf-btn--wide{min-width:110px}
.wf-zoom-pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:0 10px;
  height:40px;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.10);
  background:rgba(0,0,0,.25);
}
.wf-zoom-pill span{color:var(--muted);font-size:13px;min-width:44px;text-align:center}
.wf-thumbs{
  position:fixed;
  left:0; right:0;
  bottom:var(--toolbar-h);
  max-height:var(--thumbs-h);
  background:rgba(0,0,0,.82);
  border-top:1px solid rgba(255,255,255,.08);
  transform:translateY(105%);
  transition:transform .22s ease;
  z-index:180;
  overflow:auto;
  padding:10px;
  backdrop-filter: blur(6px);
}
.wf-thumbs.open{transform:translateY(0)}
.wf-thumbgrid{
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(130px, 1fr));
  gap:10px;
}
.wf-thumb{
  border-radius:10px;
  overflow:hidden;
  border:1px solid rgba(255,255,255,.10);
  background:#111;
  cursor:pointer;
}
.wf-thumb img{display:block;width:100%;height:auto}
.wf-thumb .wf-thumbcap{
  padding:6px 8px;
  font-size:12px;
  color:var(--muted);
  display:flex; justify-content:space-between; gap:8px;
}
.wf-toast{
  position:fixed;
  left:50%;
  transform:translateX(-50%);
  bottom:calc(var(--toolbar-h) + 14px);
  background:rgba(20,20,20,.96);
  border:1px solid rgba(255,255,255,.10);
  color:#fff;
  padding:8px 12px;
  border-radius:10px;
  font-size:13px;
  opacity:0;
  pointer-events:none;
  transition:opacity .2s ease;
  z-index:500;
}
.wf-toast.show{opacity:1}
.wf-hide{display:none!important}

/* Fullscreen: keep page fully visible */
:fullscreen .wf-stage{padding:14px 10px calc(var(--toolbar-h) + 10px)}
:fullscreen .wf-spread{width:min(98vw, 1600px)}