.header-region__afterline.stuck {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: white;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-region__upperline,
.header-region__header {
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.header-region__upperline.hidden,
.header-region__header.hidden {
  opacity: 0;
  transform: translateY(-100%);
}