.expertise-section {
  height: 100vh;
  display: flex;
  align-items: center;
  background-color: #000;
  color: white;
}

#expertise {
  scroll-margin-top: 50vh; /* scrolls so the element stops halfway down */
}

.expertise-heading {
  font-size: 8rem;
  font-weight: 900;
  line-height: 1;

}

.expertise-intro {
  font-size: 1.2rem;
  line-height: 1.6;
}

.expertise-list .row {
  border-top: 1px solid #777;
}

.expertise-list .row:first-child {
  border-top: none;
}

.expertise-number {
  font-weight: 500;
  font-size: 1.8rem;
  color: #aaa;
  padding-top: 0.5rem;
}

.expertise-label {
    font-weight: 800;
    font-size: 1.8rem;
    text-align: end;
}

.expertise-btn {
  font-weight: 800;
  color: white;
  text-align: inherit;
  transition: all 0.3s ease;
}

.expertise-btn:hover, 
.expertise-btn:focus {
  color: #aaa;
  text-decoration: none;
}

.expertise-desc {
  font-size: 1.1rem;
  line-height: 1.6;
  text-align: left !important;
}

.topographic-bg {
  background-image: url('topographic-lines.png');
  background-size: cover;
  background-repeat: no-repeat;
  opacity: 0.05;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 0;
}

.position-relative > * {
  position: relative;
  z-index: 1;
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .expertise-heading {
    font-size: 6rem;
  }
  
  .expertise-label {
    text-align: left !important;
  }
}

@media (max-width: 768px) {
  .expertise-heading {
    font-size: 4.5rem;
  }
  
  .expertise-intro,
  .expertise-desc {
    font-size: 1rem;
  }
  
  .expertise-number,
  .expertise-label,
  .expertise-btn {
    font-size: 1.5rem;
  }
}

@media (max-width: 576px) {
  .expertise-heading {
    font-size: 3.5rem;
  }
  
  .expertise-number,
  .expertise-label,
  .expertise-btn {
    font-size: 1.3rem;
  }
}