.galleria {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.mediakortti {
  position: relative;
  display: block;
  aspect-ratio: 1;
  overflow: hidden;
  background: #1a1a1a;
}

.mediakortti img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1);
  transition: filter 150ms ease, transform 150ms ease;
}

.mediakortti:hover img,
.mediakortti:focus-visible img {
  filter: grayscale(0);
  transform: scale(1.025);
}

.mediakortti[data-tyyppi="video"]::after {
  content: "▶";
  position: absolute;
  inset-block-end: 0.35em;
  inset-inline-end: 0.45em;
  color: var(--teksti);
  text-shadow: 0 1px 5px #000;
}

.mediakortti.puuttuu {
  display: grid;
  place-items: center;
  padding: 0.4em;
  border: 1px solid var(--reuna);
  color: var(--himmea);
  text-align: center;
  font-size: 0.8em;
}

@media (max-width: 700px) {
  .galleria {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 7px;
  }
}