You have add your own class with color/box-shadow/border-bottom to overwrite styling. This is the only wave to do this now.

.md-outline input:focus {
  border-color: red !important;
  box-shadow: inset 0 0 0 1px red !important;
  border-bottom: 1px solid red !important;
}

.md-outline label.active {
  color: red !important;
}