/* Variables dynamiques gérées par JS */
:root {
  --Lightbox-img-margin: 0px;
  --Lightbox-img-next-margin: 0px;
  --Lightbox-img-zoom: 100;
}





/* Arrière plan */

#Lightbox {
  display: none; /* caché par default */
  position: fixed;
  padding-top: 0;
  padding-bottom: 0;
  left: 0;
  top: 0;
  width: 100vw;
  height: 100vh;
  overflow: auto;
  background-color: rgba(0,0,0,0.9);
  user-select: none;
  -webkit-user-select: none;
  z-index: 100;
}

#Lightbox > * {
  user-select: none;
  -webkit-user-select: none;
}



/* Boutons */

.Lightbox-btn {
  position: fixed;
  top: 0px;
  left: 0px;
  width: 60px;
  text-align: center;
  font-size: 40px;
  font-weight: bold;
  color: orange;
  border: dotted 1px rgba(255,165,0,0.4);
  border-radius: 50%;
  transition: 0.3s;
  z-index: 100;
}

.Lightbox-btn:hover,
.Lightbox-btn:focus {
  color: #fff;
  background-color: #000;
  text-decoration: none;
  cursor: pointer;
}

#Lightbox-btn-close {
  left: unset;
  right: 0px;
}

#Lightbox-btn-zoomOut {
  top:  65px;
}

#Lightbox-btn-prev {
  top:  50vh;
}

#Lightbox-btn-next {
  left: unset;
  right: 0px;
  top:  50vh;
}





/* Photos */

.Lightbox-img {
  left: 0;
  right: 0;
  margin: auto;
  max-width: 100vw;
  max-height: 100vh;
  z-index: 10;
}

.Lightbox-img-prev, .Lightbox-img-next {
  position: absolute;
  top: 50%;
  bottom: 50%;
  max-width: 50vw;
  max-height: 50vh;
  filter: grayscale(100%) blur(2px) brightness(0.2);
  z-index: 1;
}

.Lightbox-img-prev {
  margin-left: 0;
}

.Lightbox-img-next {
  margin-right: 0;
}





/* Animations */

@keyframes Lightbox-anim-zoom {
  from {transform: scale(0);}
  to {transform: scale(1);}
}

@keyframes Lightbox-anim-out {
  from {
    max-width: calc(var(--Lightbox-img-zoom) * 1vw);
    max-height: calc(var(--Lightbox-img-zoom) * 1vh);
    filter: grayscale(0) blur(0) brightness(1);
    z-index: 10;
  }
  to {
    max-width: 50vw;
    max-height: 50vh;
    filter: grayscale(1) blur(2px) brightness(0.2);
    z-index: 1;
  }      
}

@keyframes Lightbox-anim-in {
  from {
    max-width: 50vw;
    max-height: 50vh;
    filter: grayscale(1) blur(2px) brightness(0.2);
    z-index: 2;
  }
  to {
    max-width: 100vw;
    max-height: 100vh;
    filter: grayscale(0) blur(0) brightness(1);
    z-index: 10;
  }      
}

@keyframes Lightbox-anim-out-left {
  from { margin-left: var(--Lightbox-img-margin); }
  to { margin-left: 0px; }
}

@keyframes Lightbox-anim-out-right {
  from { margin-right: var(--Lightbox-img-margin); }
  to { margin-right: 0px; }
}

@keyframes Lightbox-anim-in-left {
  from { margin-right: 0px; }
  to { margin-right: var(--Lightbox-img-next-margin); }
}

@keyframes Lightbox-anim-in-right {
  from { margin-left: 0px; }
  to { margin-left: var(--Lightbox-img-next-margin); }
}