/* ==========================================================================
   Scroll to Top Button
   ========================================================================== */

.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  width: 48px;
  height: 48px;
  background-color: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), background-color var(--transition-fast);
  box-shadow: var(--shadow-lg);
  outline: none;
}

.scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-5px);
}

.scroll-top:active {
  transform: translateY(-2px);
}

.scroll-top svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 2.5;
  fill: none;
  transition: transform var(--transition-base);
}

.scroll-top:hover svg {
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .scroll-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
  
  .scroll-top svg {
    width: 20px;
    height: 20px;
  }
}