.hero-section {
  height: 220px; /* puoi variare tra 200-250px */
  background: #3357a5; /* blu bootstrap, puoi cambiare */
}

.video-card {
  cursor: pointer;
}

.video-thumb {
  position: relative;
  overflow: hidden;
  border-radius: 12px; /* come preferisci */
  background: #000;    /* evita “buchi” durante il caricamento */
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;   /* KEY: uniforma tutte le preview */
  display: block;
}

.video-thumb .play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: rgba(255, 255, 255, 0.9);
  pointer-events: none;
  text-shadow: 0 6px 20px rgba(0,0,0,0.45);
}

.video-thumb:hover img {
  transform: scale(1.04);
  transition: transform .25s ease;
}