.btn-wts {
  display: inline-block;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  color: #fff !important;
  background: linear-gradient(135deg, #cc0000, #990000); /* stejný červený styl */
  border-radius: 10px;
  transition:
    box-shadow 0.25s ease,
    transform 0.25s ease,
    background 0.25s ease;
  border: none;
  cursor: pointer;
}
/* HOVER / FOCUS / ACTIVE EFEKT */
.btn-wts:hover,
.btn-wts:focus,
.btn-wts:active {
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.35); /* jednotný shadow */
  transform: scale(1.05); /* decentní zvětšení */
  background: linear-gradient(135deg, #b30000, #800000);
  outline: none; /* odstraní modrou linku focus */
}