.scroll-top {
  position: fixed;
  left: 24px;
  bottom: 70px;
  z-index: 900;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.92);
  color: #666;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.18);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 0.25s, transform 0.25s, background 0.2s, bottom 0.15s;
}

.scroll-top.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.scroll-top:hover {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.22);
}

@media (max-width: 768px) {
  .scroll-top {
    left: 12px;
    width: 38px;
    height: 38px;
  }
}

@media print {
  .scroll-top { display: none; }
}