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

body {
  font-family: "Righteous", sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #a2a0a0;
  flex-direction: column;
  gap: 20px;
}

.card {
  width: 140px;
  height: 140px;
  position: relative;
  transform-style: preserve-3d; /* faz com que indentifique o flip deixando o card 3d */
  transition: transform 0.5s;

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

.icon {
  width: 120px;
  height: 120px;
}

.card_back,
.card_front {
  width: 100%;
  height: 100%;
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 10px;
  box-shadow: 5px 5px 5px rgb(0, 0, 0, 0.5);
  backface-visibility: hidden; /* esconde quando inverte eixo */

  -webkit-backface-visibility: hidden;
  -moz-backface-visibility: hidden;
}

.flip {
  transform: rotateY(180deg); /* inverte o eixo Y */
  -webkit-transform: rotateY(180deg);
  -moz-transform: rotateY(180deg);
}

.card_back {
  background-color: #101c2c;
  /* display: none; */
}

.card_front {
  transform: rotateY(180deg); /* inicializa com o eixo Y invertido*/
  background-color: #101c2c;
  -webkit-transform: rotateY(180deg);
  -moz-transform: rotateY(180deg);
}

.mensagem {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 40px;
  margin: 20px;
  border-radius: 10px;
  background-color: #252525;
  text-align: center;
}

.display {
  display: flex;
  gap: 5px;
}

#gameStart {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  color: #ffffff;
  font-size: 2rem;
  display: flex; /* none play game */
  justify-content: center;
  align-items: center;
  flex-direction: column;
  top: 0;
}

#start {
  font-family: "Righteous", sans-serif;
  padding: 10px 20px;
  font-size: 1rem;
  color: white;
  background-color: rgb(14, 85, 132);
  border: none;
  border-radius: 5px;
}

#gameOver {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.938);
  color: #ffffff;
  font-size: 2rem;
  display: none; /* flex sobrepõe a tela */
  justify-content: center;
  align-items: center;
  flex-direction: column;
  top: 0;
}

#restart {
  font-family: "Righteous", sans-serif;
  padding: 10px 20px;
  font-size: 1rem;
  background-color: rgb(12, 148, 238);
  border: none;
  border-radius: 5px;
}

#gameBoard {
  max-width: 960px;
  display: grid;
  grid-template: 1fr 1fr 1fr 1fr / 1fr 1fr 1fr 1fr 1fr;
  gap: 20px;
}

@media (max-width: 1400px) {
  .card {
    width: 120px;
    height: 120px;
  }
  .icon {
    width: 90px;
    height: 90px;
  }
}

@media (max-width: 1000px) {
  .card {
    width: 110px;
    height: 110px;
  }
  .icon {
    width: 80px;
    height: 80px;
  }
}

@media (max-width: 800px) {
  #gameBoard {
    grid-template: 1fr 1fr 1fr 1fr 1fr / 1fr 1fr 1fr 1fr;
    gap: 15px;
  }
  .card {
    width: 90px;
    height: 90px;
  }
  .icon {
    width: 70px;
    height: 70px;
  }
}

@media (max-width: 600px) {
  #gameBoard {
    gap: 10px;
  }
  .card {
    width: 70px;
    height: 70px;
  }
  .icon {
    width: 50px;
    height: 50px;
  }
}