.challenge {
  margin-bottom: 5rem;
}

.challenge__grid {
  width: 100%;
  box-sizing: border-box;
  display: grid;
  gap: 1rem;
  padding: 0 5rem;
  overflow: hidden;
  grid-template-areas:
    "a a b"
    "c d b"
    "c d e"
    "f f e";
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(4, 15rem);
}

.challenge__item {
  position: relative;
  overflow: hidden;
  border-radius: 5px;
  color: #d9d9d9;
}

.item-1 {
  grid-area: a;
}

.item-2 {
  grid-area: b;
}

.item-3 {
  grid-area: c;
}

.item-4 {
  grid-area: d;
}

.item-5 {
  grid-area: e;
}

.item-6 {
  grid-area: f;
}

.item-1 .challenge__image::before,
.item-2 .challenge__image::before,
.item-6 .challenge__image::before {
  background-color: rgba(22, 22, 22, 0.2);
}

.challenge__item .challenge__image::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  z-index: 1;
}

.item-1 .challenge__image img {
  object-position: 0 30%;
}

.item-2 .challenge__image img {
  object-position: 55% 0;
}

.item-3 .challenge__image img {
  object-position: 20% 0;
}

.item-6 .challenge__image img {
  object-position: 0 70%;
}

.challenge__image,
.challenge__image img {
  display: inline-block;
  box-sizing: border-box;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.challenge article {
  position: absolute;
  bottom: 0;
  z-index: 1;
  padding: 1rem 1rem;
  padding-top: 8rem;
  background: linear-gradient(to bottom, transparent, #161616);
}

.challenge article::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  transform: scaleX(0);
  height: 3px;
  background-color: seagreen;
  transform-origin: left;
  transition: transform 200ms ease-out 600ms;
}

.challenge .challenge__item:hover article::before {
  transform: scaleX(100%);
  transition: transform 200ms ease-out;
}

.challenge__title,
.challenge__text {
  margin: 0;
}

.challenge__title {
  margin-bottom: 0.2rem;
  font-size: 1rem;
  text-transform: uppercase;
}

.challenge__text {
  overflow: hidden;
  max-height: 0;
  font-size: 0.9rem;
  line-height: 1.5rem;
  transition: max-height 400ms cubic-bezier(0, 1, 0, 1);
  color: rgba(255, 255, 255, 0.6);
}

.challenge__item:hover .challenge__text {
  max-height: 9999px;
  transition: max-height 400ms cubic-bezier(1, 0, 1, 0) 400ms;
}

.participant__group:not(:nth-child(1), :nth-child(7)) {
  opacity: 0.2;
}

.factor__item {
  flex-basis: calc(20% - 1rem);
}

.navigation__flex__item:nth-child(2) {
  display: none;
}

@media (max-width: 1100px) {
  .challenge__grid {
    box-sizing: border-box;
    grid-template-areas: unset;
    grid-template-columns: 1fr;
    grid-template-rows: repeat(6, 20rem);
  }

  .challenge__item {
    grid-area: unset;
  }

  .challenge__item .challenge__text {
    max-height: 9999px;
  }

  .challenge .challenge__item article::before {
    transform: scaleX(100%);
  }
}