body {
  margin: 0;
  padding: 0;
  font-family: 'Comic Sans MS', cursive, sans-serif;
  background: linear-gradient(to bottom, #fffde7, #ffe0b2);
  overflow-x: hidden;
  position: relative;
}

canvas#particles {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

header {
  text-align: center;
  padding: 20px 10px 10px;
  position: relative;
  z-index: 2;
}

h1 {
  font-size: 2rem;
  color: #d84315;
}

.slogan {
  margin: 5px 0;
  font-weight: bold;
  color: #6d4c41;
}

.placar {
  font-size: 1.2rem;
  margin-top: 10px;
  color: #4e342e;
}

main {
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  z-index: 2;
}

.grid-cartas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: 10px;
  max-width: 600px;
  margin: 0 auto;
  justify-items: center;
}

.carta {
  width: 90px;
  height: 135px;
  perspective: 1000px;
}

.carta-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s;
  cursor: pointer;
}

.carta.virada .carta-inner {
  transform: rotateY(180deg);
}

.carta-front, .carta-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.carta-front {
  transform: rotateY(180deg);
}

button {
  margin-top: 15px;
  padding: 10px 20px;
  background-color: #ffab91;
  border: none;
  border-radius: 15px;
  font-size: 1rem;
  cursor: pointer;
}

button.voltar {
  background-color: #a5d6a7;
  margin-top: 10px;
}

@media (max-width: 500px) {
  h1 {
    font-size: 1.6rem;
  }

  .grid-cartas {
    grid-template-columns: repeat(3, 1fr);
  }

  .carta {
    width: 70px;
    height: 105px;
  }
}
#rodape {
  background-color: #ffe0b2;
  color: #4e342e;
  padding: 15px;
  text-align: center;
  font-size: 0.9rem;
  border-top: 2px solid #d7ccc8;
  margin-top: 30px;
  position: relative;
  z-index: 2;
}

.footer-texto {
  margin-bottom: 5px;
}

#relogio {
  font-weight: bold;
  font-size: 1.2rem;
}