*{box-sizing:border-box}
html,body{
  margin:0;
  width:100%;
  height:100%;
  background:#111;
  color:#fff;
  font-family:Arial,Helvetica,sans-serif;
  overflow:hidden;
}

#menuStrip{
  width:100vw;
  height:100dvh;
  display:flex;
  overflow-x:auto;
  overflow-y:hidden;
  scroll-snap-type:x mandatory;
  scroll-behavior:smooth;
  -webkit-overflow-scrolling:touch;
  overscroll-behavior-x:contain;
  scrollbar-width:none;
}
#menuStrip::-webkit-scrollbar{display:none}

.page{
  flex:0 0 100vw;
  width:100vw;
  height:100dvh;
  display:flex;
  align-items:center;
  justify-content:center;
  scroll-snap-align:start;
  scroll-snap-stop:always;
  background:#111;
}

.page img{
  display:block;
  max-width:100vw;
  max-height:100dvh;
  width:auto;
  height:auto;
  object-fit:contain;
  user-select:none;
  -webkit-user-drag:none;
  touch-action:pan-x pinch-zoom;
}

.nav{
  position:fixed;
  top:50%;
  transform:translateY(-50%);
  z-index:10;
  width:46px;
  height:64px;
  border:0;
  border-radius:12px;
  background:rgba(0,0,0,.48);
  color:white;
  font-size:42px;
  line-height:1;
  cursor:pointer;
  backdrop-filter:blur(4px);
}
.nav:active{transform:translateY(-50%) scale(.95)}
.left{left:8px}
.right{right:8px}

#counter{
  position:fixed;
  z-index:10;
  left:50%;
  bottom:10px;
  transform:translateX(-50%);
  background:rgba(0,0,0,.58);
  padding:7px 11px;
  border-radius:999px;
  font-size:14px;
  backdrop-filter:blur(4px);
}

@media (max-width:600px){
  .nav{
    width:36px;
    height:52px;
    font-size:34px;
    opacity:.68;
  }
  .left{left:3px}
  .right{right:3px}
  #counter{bottom:6px}
}