.ui-style-5 {
  --primary-color: #667eea;
  --secondary-color: #764ba2;
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--primary-color);
  color: white;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  transition: all 0.3s;
  z-index: 1000;
}

.back-to-top:hover {
  background: var(--secondary-color);
  transform: translateY(-4px);
}

.back-to-top.show {
  display: flex;
}

@media print {
  header, footer, nav, .back-to-top { display: none; }
}