/* =========================
   SCROLL TO TOP BUTTON
   ========================= */
#scrollTopBtn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 1100;
  background: var(--accent-color);
  border: 2px solid var(--accent-color);
  padding: 12px;
  border-radius: 50%;
  cursor: pointer;
  color: var(--text-color);
  font-size: 18px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(10px);
}

#scrollTopBtn.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#scrollTopBtn:hover {
  background: transparent;
  color: var(--accent-color);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

#scrollTopBtn:active {
  transform: translateY(-1px);
}

#scrollTopBtn:focus-visible {
  box-shadow: var(--focus-ring);
}

#scrollTopBtn svg {
  transition: transform 0.2s ease;
}

#scrollTopBtn:hover svg {
  transform: translateY(-2px);
}