body {
  background-color: #343a40;
  color: #f8f9fa;
  font-family: 'Segoe UI', sans-serif;
}

.card-dark {
  background-color: #495057;
  border: none;
  border-radius: 10px;
  animation: flipIn 0.8s ease-in-out;
  transition: background-color 0.3s ease;
}

.card-dark:hover {
  background-color: #5a6268;
}

input, select {
  transform: translateX(-20px);
  opacity: 0;
  animation: slideIn 0.5s forwards;
}

input:nth-child(2) { animation-delay: 0.1s; }
input:nth-child(3) { animation-delay: 0.2s; }

@keyframes flipIn {
  0% { transform: rotateY(90deg); opacity: 0; }
  100% { transform: rotateY(0); opacity: 1; }
}

@keyframes slideIn {
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.card-dark {
  background: linear-gradient(145deg, #495057, #3c4044);
  background-size: 200% 200%;
  animation: gradientMove 10s ease infinite;
}

@keyframes gradientMove {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

input:focus, select:focus {
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
  transition: box-shadow 0.3s ease;
}

.btn-light:active {
  animation: vibrate 0.2s linear 2;
}

@keyframes vibrate {
  0% { transform: translateX(0); }
  25% { transform: translateX(-3px); }
  50% { transform: translateX(3px); }
  75% { transform: translateX(-2px); }
  100% { transform: translateX(0); }
}

.list-group-item {
  animation: fadeZoomIn 0.5s ease;
}

@keyframes fadeZoomIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}