body {
  font-family: 'Inter', sans-serif;
  background-color: #0a0a1a;
}

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

.quiz-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

.time-period.selected {
  transform: scale(1.05);
}

.time-slot.selected {
  background-color: #1d4ed8;
  color: white;
  border-color: #1d4ed8;
}

.fade-in { animation: fadeIn 0.5s ease-in-out; }
.fade-in-slow { animation: fadeIn 1s ease-in-out; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.time-slots-container {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease-in-out;
}

@media (max-width: 640px) {
  .day-btn, .period-btn, .slot-btn {
    font-size: 0.75rem;
    padding: 0.5rem;
  }
  .day-container {
    min-width: 40px;
  }
}