* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Righteous", sans-serif;
  display: grid;
  grid-template: auto auto auto / auto;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #f2cc8f;
}

/*--------------------------------------------------GameBoard--------------------------------------------------*/
#gameBoard {
  max-width: 700px;
  display: grid;
  grid-template: 1fr 1fr 1fr 1fr / 1fr 1fr 1fr 1fr 1fr;
  gap: 20px;
}

/*--------------------------------------------------Tittles--------------------------------------------------*/
.top,
.bottom {
  color: #3d405b;
  font-size: 60px;
  text-shadow: 5px 5px 10px rgba(107, 112, 92, 0.7);
}

.bottom {
  text-align: end;
}

/*--------------------------------------------------Card--------------------------------------------------*/
.card {
  width: 110px;
  height: 110px;
  position: relative;

  -webkit-transform-style: preserve-3d;
  -webkit-transition: transform 0.5s;
  transform-style: preserve-3d;
  transition: transform 0.5s;
}

.card_back,
.card_front {
  width: 100%;
  height: 100%;
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 10px;
  box-shadow: 10px 10px 10px rgba(107, 112, 92, 0.7);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.card_front {
  -webkit-transform: rotateY(180deg);
  transform: rotateY(180deg);
  background-color: #3d405b;
}

.card_back {
  color: #f4f1de;
  background-color: #2a9d8f;
  font-size: 30px;
  /* display: none; */
}

.icon {
  width: 80px;
  height: 80px;
  max-width: 80px;
  max-height: 80px;
}

.flip {
  -webkit-transform: rotateY(180deg);
  transform: rotateY(180deg);
}

/*--------------------------------------------------Options--------------------------------------------------*/
#gameOver {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  color: white;
  font-size: 40px;
  display: none;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  top: 0;
}

#restart {
  padding: 20px;
  font-size: 20px;
  font-family: "Righteous", sans-serif;
  background-color: #e9c46a;
  border: none;
  border-radius: 20px;
  margin-top: 10px;
}

/*--------------------------------------------------Responsive--------------------------------------------------*/
@media only screen and (max-width: 700px) {
  .card {
    width: 80px;
    height: 80px;
  }
  .card_back {
    font-size: 20px;
  }
  .icon {
    width: 60px;
    height: 60px;
  }
  #gameOver {
    font-size: 30px;
  }
  #restart {
    padding: 15px;
    font-size: 15px;
  }
}

@media only screen and (max-width: 550px) {
  #gameBoard {
    grid-template: 1fr 1fr 1fr 1fr 1fr / 1fr 1fr 1fr 1fr;
  }
  .top,
  .bottom {
    font-size: 40px;
  }
  .card {
    width: 60px;
    height: 60px;
  }
  .card_back {
    font-size: 15px;
  }
  .icon {
    width: 40px;
    height: 40px;
  }
  #gameOver {
    font-size: 20px;
  }
  #restart {
    padding: 10px;
    font-size: 10px;
  }
}

@media only screen and (max-width: 350px) {
  #gameBoard {
    gap: 10px;
  }
  #gameOver {
    font-size: 15px;
  }
}