.level-card-placeholder {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.level-card {
  transition: all 0.3s ease;
}

.level-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.level-image {
  transition: opacity 0.3s ease;
}

.level-image-placeholder {
  animation: shimmer 2s infinite linear;
  background: linear-gradient(90deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.1) 50%, rgba(255,255,255,0) 100%);
  background-size: 200% 100%;
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

.level-badge {
  transition: transform 0.3s ease;
}

.level-card:hover .level-badge {
  transform: scale(1.1);
}

.level-tab-btn {
  position: relative;
  transition: all 0.2s ease;
  overflow: hidden;
}

.level-tab-btn:hover {
  transform: translateY(-1px);
}

.level-tab-btn:active {
  transform: scale(0.97);
}

.level-tab-btn.active {
  background: linear-gradient(135deg, #7c3aed, #a855f7);
  color: white;
  border-color: transparent;
  box-shadow: 0 4px 6px -1px rgba(124, 58, 237, 0.3);
}

.level-tab-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  transition: left 0.5s ease;
}

.level-tab-btn:hover::before {
  left: 100%;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

@media (max-width: 640px) {
  .level-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .level-card {
    margin-left: -0.5rem;
    margin-right: -0.5rem;
    border-radius: 0.75rem;
  }

  .level-image-container {
    height: 180px;
  }

  .level-tab-btn {
    font-size: 0.8125rem;
    padding: 0.5rem 1rem;
  }
}

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

.level-image {
  transition: transform 0.4s ease;
}