/* sections/scroll-top — 공통 플로팅 버튼 */
.scroll-top {
  position: fixed;
  right: var(--space-6);
  bottom: var(--space-6);
  z-index: 40;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-text);
  color: var(--color-bg);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition:
    opacity var(--motion-base) var(--ease-out),
    transform var(--motion-base) var(--ease-out),
    background var(--motion-fast) var(--ease-out);
}
.scroll-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.scroll-top:hover { background: #1F2630; }
.scroll-top svg { width: 20px; height: 20px; }

@media (prefers-reduced-motion: reduce) {
  .scroll-top { transition: opacity var(--motion-fast); transform: none; }
}

@media (max-width: 600px) {
  .scroll-top {
    right: var(--space-4);
    bottom: var(--space-4);
    width: 40px; height: 40px;
  }
}