@keyframes smoothAppear {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.loading-spinner {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 40px;
  border: 4px solid rgba(243, 243, 243, 0.3);
  border-top: 4px solid #3498db;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  z-index: 1000;
}

@keyframes spin {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}

.member-card {
  animation: smoothAppear 0.6s ease-out forwards;
  opacity: 0;
}

.tab-content {
  transition: opacity 0.3s ease, visibility 0.3s ease;
  opacity: 0;
  visibility: hidden;
  height: 0;
  overflow: hidden;
}

.tab-content.active {
  opacity: 1;
  visibility: visible;
  height: auto;
  overflow: visible;
}

@media (max-width: 768px) {
  .tab-btn {
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    transition: all 0.3s ease;
  }

  .member-card {
    margin-bottom: 1.5rem;
    animation: none;
    opacity: 1;
  }
}