/* ===== Research Group Card Grid ===== */

.research-group-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px 20px;
  max-width: 900px;
  margin: 2rem auto;
}

.rg-card {
  position: relative;
  display: block;
  width: 90%;
  margin: 0 auto;
  aspect-ratio: 4 / 3;
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.10), 0 2px 6px rgba(0, 0, 0, 0.06);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.rg-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.14), 0 4px 10px rgba(0, 0, 0, 0.08);
}

.rg-card-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

.rg-card-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  padding: 20px;
  background: none;
}

.rg-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: rgb(10, 186, 181);
}

/* ===== Responsive: single column on small screens ===== */
@media (max-width: 640px) {
  .research-group-grid {
    grid-template-columns: 1fr;
  }
}