/* Give the header room */
#t4-header {
  min-height: 120px;
}

#t4-header .t4-section-inner,
#t4-header .navbar-brand {
  display: flex;
  align-items: center;
}

/* Let the logo grow, keep its aspect ratio */
#t4-header .navbar-brand img.logo-img {
  width: auto;
  height: auto;
  max-height: 90px;   /* your target logo height */
  max-width: 100%;
  object-fit: contain;
}

/* Small-screen logo, if you set one */
@media (max-width: 575.98px) {
  #t4-header .navbar-brand img.logo-img-sm {
    max-height: 48px;
  }
}