body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: url("../img/background.jpg") center/cover repeat, rgb(47, 1, 61);
  height: 100vh;

  user-select: none;
}

.container {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background-color: rgba(88, 87, 88, 0.39);
  border-radius: 10px;
}

h2 {
  font-size: 2em;
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-weight: bolder;
  text-shadow: 0 0 3px #350066;
}

.reset {
  padding: 10px 0px;
  width: 100%;
  color: #ffffff;
  background-color: #350066;
  border: none;
  font-size: 1.4em;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  font-weight: 600;
}

.reset:focus {
  color: #00e1ff;
  background-color: #582296;
}

.game {
  width: 410px;
  height: 410px;
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  transform-style: preserve-3d;
  perspective: 500px;
}

.item {
  position: relative;
  width: 90px;
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #fff;
  border-radius: 10px;
  font-size: 3em;
  transform: rotateY(180deg);
  transition: 0.5s;
}

.item::after {
  content: "";
  position: absolute;
  inset: 0;
  background: url(../img/kimetsu.png),
    linear-gradient(rgb(87, 100, 128), #581831);
  background-size: cover;
  background-position: center;
  transition: 0.5s;
  border-radius: 10px;
  transform: rotateY(0deg);
  backface-visibility: hidden;
}

.item.boxOpen {
  transform: rotateY(0deg);
}

.boxOpen::after,
.boxMatch::after {
  transform: rotateY(180deg);
}

footer {
  margin: 0 auto;
  text-align: center;
  font-weight: bold;
  color: #fff;
}

.social {
  padding-top: 5px;
}

/* Responsividade */

@media (max-width: 500px) {
  .container {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 10px;
    align-items: center;
  }

  h2 {
    font-size: 1.5em;
    letter-spacing: 0.2em;
    font-weight: bolder;
  }

  .reset {
    padding: 10px 0px;
    width: 70%;
    font-size: 1.4em;
    letter-spacing: 0.1em;
  }

  .game {
    width: 300px;
    height: 300px;
    gap: 5px;
  }

  .item {
    width: 65px;
    height: 65px;
    border-radius: 5px;
  }
  .item::after {
    border-radius: 5px;
  }
}