/* Global Styles */
body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
  background: #1a202c;
}

.background-animation {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
}

.shape {
  position: absolute;
  border-radius: 50%;
  animation: shapeAnimation 10s infinite ease-in-out;
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

@keyframes shapeAnimation {
  0% {
    transform: translateY(-100%) scale(0.5);
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    transform: translateY(100%) scale(0.5);
    opacity: 0;
  }
}

.game-container {
  width: 80%;
  max-width: 400px;
  background: white;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  position: relative;
  z-index: 1;
}

.header {
  background: #545754;
  color: white;
  text-align: center;
  padding: 1rem;
  font-size: 1.75rem;
  letter-spacing: 1px;
  font-weight: bold;
}

.player-mode {
  text-align: center;
  margin-bottom: 1rem;
}

.player-mode button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  color: white;
  background-color: #747674;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  margin: 0 0.5rem;
}

.player-mode button:hover {
  background-color: #5a5e5b;
}

.game-board {
  display: grid;
  gap: 5px; /* Adjusted spacing for better balance */
  padding: 15px;
  grid-template-columns: repeat(3, 1fr); /* Adjusted for 6 cards */
}

.card {
  width: 100%;
  height: 80px; /* Slightly smaller than before for balance */
  perspective: 100px;
  position: relative;
  transform-style: preserve-3d;
  cursor: pointer;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
  border: 2px solid transparent;
  animation: borderAnimation 2s infinite;
}

@keyframes borderAnimation {
  0%, 100% {
    border-color: transparent;
  }
  50% {
    border-color: #4CAF50;
  }
}

.card:hover {
  transform: scale(1.05);
}

.card-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s ease;
  transform-origin: center;
}

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

.card-front,
.card-back {
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 12px; /* Slightly reduced rounded corners */
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.1); /* Reduced inner shadow */
}

.card-front {
  background: #eaeaea;
}

.card-back {
  background: no-repeat center center;
  background-size: cover;
  transform: rotateY(180deg);
}

.scoreboard {
  text-align: center;
  padding: 1rem;
  background: #f9f9f9;
  border-top: 1px solid #ddd;
}

.scoreboard p {
  margin: 0.5rem 0;
  font-size: 1rem;
}

button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  color: white;
  background-color: #7a817a;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #474847;
}

.congratulations,
.game-over {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(255, 255, 255, 0.9);
  padding: 20px 40px;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.congratulations.show,
.game-over.show {
  display: flex;
}