.investigator-profile {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background-color: #f8f9fa;
    border-radius: 15px;
  }

  .investigator-profile:hover {
    transform: translateY(-5px);
    box-shadow: 0px 10px 20px rgba(0, 0, 0, 0.15);
  }

  .profile-img img {
    border: 4px solid #fff;
    width: 160px;
    height: 160px;
    object-fit: cover;
  }

  .filter-btn.active,
  .filter-btn:hover {
    background-color: #51AD32;
    color: #fff;
  }

  .teacher-bio.expanded {
    max-height: none;
    -webkit-line-clamp: unset;
    line-clamp: unset;
  }

  .teacher-bio {
    max-height: 60px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    display: -moz-box;
    display: box;
    line-clamp: 3;
    box-orient: vertical;
    transition: max-height 0.3s ease;
  }