body {
  background-color: #121212;
  color: #0fefef;
  font-family: 'Orbitron', sans-serif;
}

#kaiju-game {
  background: radial-gradient(#1e1e1e, #0a0a0a);
  border: 2px solid #444;
  padding: 20px;
  border-radius: 16px;
  max-width: 1000px;
  margin: 40px auto;
  box-shadow: 0 0 20px #0fefef;
}

#game-header, #card-area, #stats-area {
  display: flex;
  justify-content: space-between;
  margin-bottom: 20px;
}

.card-slot {
  width: 180px;
  height: 250px;
  background: #222;
  border: 2px dashed #0fefef;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 6px;
}

.card-slot > .card-thumbnail {
  height: 100%;
  width: 100%;
  box-sizing: border-box;
}

button {
  background-color: #0fefef;
  color: #000;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.2s ease;
}

button:hover {
  transform: scale(1.05);
}

.card-thumbnail {
  background-color: #111;
  padding: 0.75rem;
  border-radius: 12px;
  text-align: center;
  color: white;
  border: 2px dashed cyan;
  animation: fadeInUp 0.5s ease;
}

.card-image {
  width: 100%;
  max-height: 180px;
  object-fit: contain;
  margin-bottom: 0.5rem;
  border-radius: 8px;
}

.card-title {
  font-weight: bold;
  font-size: 1.1rem;
  margin-top: 0.25rem;
}

.card-effect {
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

.card-qr {
  display: block;
  margin-top: 0.5rem;
  color: #0ff;
  text-decoration: underline;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 600px) {
  .card-slot {
    width: 45vw;
    height: auto;
  }

  .card-image {
    max-height: 120px;
  }
}