/* ============================================================
   15. SCROLL TO TOP BUTTON
   ============================================================ */
.scroll-to-top-btn {
  position: fixed;
  bottom: 100px;
  left: 30px;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, #00D4FF 0%, #7C3AED 100%);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 1.25rem;
  cursor: pointer;
  z-index: 9997;
  box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

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

.scroll-to-top-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 212, 255, 0.5);
}

.scroll-to-top-btn:active {
  transform: translateY(0);
}

@media (max-width: 480px) {
  .scroll-to-top-btn {
    bottom: 84px;
    left: 20px;
    width: 42px;
    height: 42px;
    font-size: 1rem;
  }
}