/**
 * Back to Top Button
 * Smooth scroll button that appears after scrolling down
 */

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, #02367b 0%, #0061fb 100%);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(2, 54, 123, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(2, 54, 123, 0.4);
  background: linear-gradient(135deg, #0061fb 0%, #02367b 100%);
}

.back-to-top:active {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(2, 54, 123, 0.3);
}

/* Arrow Icon */
.back-to-top::before {
  content: '';
  width: 0;
  height: 0;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-bottom: 12px solid white;
  margin-bottom: 2px;
}

/* Responsive */
@media (max-width: 768px) {
  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 45px;
    height: 45px;
  }
}

@media (max-width: 480px) {
  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 42px;
    height: 42px;
  }
}