:root {
  --text-color: #dbe4ef;
  --card-front-color: #144480;
  --card-back-color: #00f4bf;
}

body {
  background: url('img/bg-desktop.webp');
  font-family: 'Bai Jamjuree', sans-serif;
  margin: 0;
  padding: 0;
}

#container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding: 3rem;
  justify-items: center;
}

.cartao {
  width: 100%;
  max-width: 300px;
  height: 250px;
  perspective: 1000px;
}

.cartao__conteudo {
  position: relative;
  background-color: var(--card-front-color);
  text-align: center;
  height: 100%;
  width: 100%;
  transform-style: preserve-3d;
  transition: transform 0.6s;
  border-radius: 1rem;
}

.cartao__conteudo h3 {
  color: var(--text-color);
  border: 1px solid var(--text-color);
  text-align: left;
  padding: 0.5rem 1rem;
  position: absolute;
  top: 1rem;
  left: 1rem;
  border-radius: 2rem;
  font-size: 1rem;
  backface-visibility: hidden;
  margin: 0;
}

.cartao__conteudo__perguntas,
.cartao__conteudo__resposta {
  backface-visibility: hidden;
  position: absolute;
  height: 100%;
  width: 100%;
  box-sizing: border-box;
  top: 0;
  left: 0;
  padding: 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.cartao__conteudo__perguntas p {
  color: var(--text-color);
  font-weight: 500;
  font-size: 1.2rem;
  margin: 0;
}

.cartao__conteudo__resposta {
  transform: rotateY(180deg);
  background-color: var(--card-back-color);
  border: 4px solid var(--card-front-color);
  color: var(--card-front-color);
  font-weight: 700;
  font-size: 1.2rem;
}

.cartao__conteudo.girado {
  transform: rotateY(180deg);
}

/* Responsividade */
@media (max-width: 1000px) {
  #container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  #container {
    grid-template-columns: 1fr;
    padding: 2rem;
  }

  .cartao {
    max-width: 90%;
    height: 220px;
  }

  .cartao__conteudo__perguntas p,
  .cartao__conteudo__resposta {
    font-size: 1rem;
  }

  .cartao__conteudo h3 {
    font-size: 0.9rem;
  }
}

/* Rodapé */
footer {
  background-color: black;
  color: white;
  position: fixed;
  bottom: 0;
  width: 100%;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

footer p {
  text-align: center;
  font-size: 1rem;
  margin: 0;
}