/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: var(--button-text-color);
  border: 2px solid var(--border-color);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--button-shadow);
  z-index: 999;
}

.back-to-top:hover {
  background-color: var(--primary-hover);
  transform: translateY(-3px);
  box-shadow: var(--button-hover-shadow);
}

.back-to-top.active {
  opacity: 1;
  visibility: visible;
}

/* Light Mode Variables */
:root {
  --primary-color: #474559;
  --primary-hover: #ffc200;
  --button-text-color: #ffffff;
  --border-color: rgba(0, 0, 0, 0.1);
  --button-shadow: 0 2px 10px rgba(108, 99, 255, 0.3);
  --button-hover-shadow: 0 4px 12px rgba(108, 99, 255, 0.4);
}

/* Dark Mode Variables */
[data-theme="dark"] .back-to-top {
  --primary-color: #7d75ff;
  --primary-hover: #6c63ff;
  --button-text-color: #ffffff;
  --border-color: rgba(255, 255, 255, 0.1);
  --button-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  --button-hover-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .back-to-top {
    width: 42px;
    height: 42px;
    bottom: 20px;
    right: 20px;
  }
  
  .back-to-top i {
    font-size: 1.2rem;
  }
}