.photo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
}

.page-content img {
  max-width: 100%;
}

/* ... (dein bestehender CSS-Code) */

.popup-container {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  justify-content: center;
  align-items: center;
}

.popup-close {
  position: absolute;
  width: 2.4rem;
  height: 2.4rem;
  top: 2rem;
  right: 2rem;
  color: var(--light-text-color);
  cursor: pointer;
}

.popup-trigger:hover {
  border: 2px solid var(--accent-color);
}

@media (max-width: 940px) {
  .photo-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 540px) {
  .photo-grid {
    grid-template-columns: 1fr;
  }

  .popup-trigger:hover {
    border: none;
  }
}