a, a:visited {
-webkit-transition: 0.5s ease;
transition: 0.5s ease; 
}

a:hover, a:visited:hover {
color: #000000 !important;
font-weight: bold !important;
-webkit-transition: 0s ease;
transition: 0s ease; 
}
a:active { 
font-weight: bold; /* Жирное начертание */; 
}