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

body {
  font-family: 'Arial', sans-serif;
  background-image: url('game-box-gif.gif');
  background-size: cover;
  background-position: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: #ff5722;
  padding: 10px;
  text-align: center;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  z-index: 1000;
  animation: slideDown 0.6s ease-out;
}

.navbar-content h2 {
  color: white;
  font-size: 1.5rem;
  margin: 0;
}

.credits {
  color: white;
  font-size: 0.9rem;
  margin-top: 5px;
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
  }
  to {
    transform: translateY(0);
  }
}

.game-container {
  text-align: center;
  width: 80%;
  max-width: 600px;
  position: relative;
  background-color: rgba(255, 255, 255, 0.8);
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
  margin-top: 60px; /* To accommodate the navbar */
}

h1 {
  color: #333;
  margin-bottom: 20px;
}

.game-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 20px;
}

button {
  background-color: #ff5722;
  border: none;
  padding: 10px 20px;
  color: white;
  font-size: 1rem;
  cursor: pointer;
  border-radius: 5px;
}

button:hover {
  background-color: #e64a19;
}

.game-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.card {
  width: 100px;
  height: 100px;
  background-color: #ff9800;
  border-radius: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2rem;
  color: white;
  cursor: pointer;
  position: relative;
  transition: transform 0.3s;
}

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

.card.flipped {
  background-color: #8bc34a;
}

.card.matched {
  background-color: #4caf50;
  pointer-events: none;
  animation: matchAnimation 0.5s forwards;
}

.card.hidden {
  background-color: #ff9800;
  color: transparent;
  cursor: default;
}

.popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
  z-index: 1000;
  text-align: center;
}

.popup-content {
  margin: 0;
}

.popup-content button {
  margin-top: 10px;
  background-color: #ff5722;
  border: none;
  padding: 10px 20px;
  color: white;
  font-size: 1rem;
  cursor: pointer;
  border-radius: 5px;
}

.popup-content button:hover {
  background-color: #e64a19;
}

@keyframes matchAnimation {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
    background-color: #4caf50;
  }
}