.grid_item {
  width: 80%;
  height: 100%;
  position: relative;
  overflow: hidden;
  margin: auto;
}

.grid_item:nth-child(4n) {
  grid-column-start: 2;
  scroll-snap-align: start;
}

.grid_item:nth-child(4n + 1) {
  grid-column-start: 2;
}

.grid_item:nth-child(4n - 1) {
  grid-column-start: 1;
}

.vid_fill, .img_fill {
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
  -o-object-position: center;
     object-position: center;
}

.reveal_fromLeft {
  position: relative;
  left: 0;
}

.reveal_fromRight {
  position: relative;
  right: 0;
}

.grid_opciones {
  display: flex;
  flex-direction: column;
  text-align: right;
}

.grid_opciones h2 {
  margin: 0.4rem;
}

.grid_opciones h2:hover {
  text-decoration: underline;
}

.grid_proyectos {
  opacity: 1;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  right: 0;
  overflow: hidden;
  /*height: calc(70vh);*/
  filter: brightness(92%) contrast(94%);
  transition: 400ms ease;
}

.grid_proyectos .grid_link {
  width: auto;
  height: auto;
  overflow: hidden;
  display: block;
  position: absolute;
  margin: auto;
  color: white;
  opacity: 1;
  transition: 800ms ease;
  z-index: 1;
}

.grid_proyectos .grid_link span {
  visibility: hidden;
  opacity: 0;
  display: block;
  font-weight: 500;
}

.grid_proyectos:hover, .grid_proyectos:focus {
  filter: brightness(112%) contrast(108%);
  transition: 400ms ease;
}

.grid_proyectos:hover .grid_link span, .grid_proyectos:focus .grid_link span {
  -webkit-animation: animateSpan 800ms forwards var(--delay, 0ms);
          animation: animateSpan 800ms forwards var(--delay, 0ms);
}

.grid_proyectos:hover .grid_link span:after, .grid_proyectos:focus .grid_link span:after {
  background: none repeat scroll 0 0 transparent;
  bottom: 0;
  content: "";
  display: block;
  height: 0.1rem;
  left: 50%;
  position: absolute;
  background: #fff;
  transition: width 300ms ease 0ms, left 300ms ease 0ms;
  width: 0;
}

.grid_proyectos:hover .grid_link span:hover:after, .grid_proyectos:focus .grid_link span:hover:after {
  width: 100%;
  left: 0;
}

@-webkit-keyframes animateSpan {
  0% {
    transform: translateY(20px);
    visibility: hidden;
    opacity: 1;
  }
  100% {
    transform: translateY(0px);
    visibility: visible;
    opacity: 1;
  }
}

@keyframes animateSpan {
  0% {
    transform: translateY(20px);
    visibility: hidden;
    opacity: 1;
  }
  100% {
    transform: translateY(0px);
    visibility: visible;
    opacity: 1;
  }
}

@media (max-width: 1000px) {
  .grid_item:nth-child(1n) {
    grid-column-start: 1;
  }
  .vid_fill, .img_fill {
    -o-object-fit: contain;
       object-fit: contain;
  }
  
  .grid_proyectos .grid_link span {
    font-size: calc(1rem + (40 - 32) * ((100vw - 300px) / (1600 - 300)));
    visibility: visible;
    opacity: 1;
  }
  .grid_proyectos {
      height: calc(46vh);
  }
}