.ksef-header-link {
  margin-top: 4px;
}
.ksef-header-link a {
  color: #DC0000;
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  border-bottom: 2px solid #DC0000;
  padding-bottom: 1px;
  transition: color 0.2s, border-color 0.2s;
}
.ksef-header-link a:hover {
  color: #FF3333;
  border-color: #FF3333;
}