/* Custom styles for BioStat Buddy */

.concept-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.exam-tip {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  border-radius: 12px;
  transition: transform 0.2s ease;
}

.exam-tip:hover {
  transform: translateY(-2px);
}

.question-card {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.related-concept {
  background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  border-radius: 20px;
  transition: all 0.2s ease;
}

.related-concept:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.loading-spinner {
  border: 3px solid #f3f3f3;
  border-top: 3px solid #667eea;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
}

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

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

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

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}