.hero-bg {
  background-image: linear-gradient(to bottom right, rgba(0, 102, 204, 0.9), rgba(15, 23, 42, 0.9)), url('https://images.unsplash.com/photo-1565552629477-cdcbbf454131?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
  background-size: cover;
  background-position: center;
}

.mockup-shadow {
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

#toTop {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #0066CC;
  color: white;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  z-index: 9999;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
  opacity: 0;
  /* Hidden by default, JS toggles opacity usually or display */
  pointer-events: none;
  /* Disable clicks when hidden */
}

#toTop.show {
  opacity: 1;
  pointer-events: auto;
}