body {
    margin: 0;
    padding: 0;
    background: rgb(0, 0, 0);
    font-family: Arial, sans-serif;
  }

  .overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    color: yellow;
    font-weight: bold;
  }
  
  .overlay h1 {
    margin: 0;
    font-size: 3rem;
  }
  
  .close-btn {
    text-decoration: none;
    color: yellow;
    font-size: 3rem;
    padding: 5px 10px;
  }
  
  
  /* Grille des 4 vidéos carrées */
.grid-2x2 {
  display: grid;
  grid-template-columns: 50% 50%;
  grid-template-rows: 50% 50%;
  width: 100vw;
  height: 100vw;
  margin: 0;
  padding: 0;
  border-collapse: collapse;
}

.grid-1x2 {
  display: grid;
  grid-template-columns: 50% 50%;
  grid-template-rows: 100%;
  width: 100vw;
  height: 50vw; /* 1 ligne de carrés => hauteur = 50vw pour conserver le ratio 1:1 */
  margin: 0;
  padding: 0;
  border-collapse: collapse;
}

.video-square {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: black;
}

.video-square iframe {
  position: absolute;
  width: 100%;
  height: 100%;
  display: block;
  border: none;
  margin: 0%;
  padding: 0;
  box-sizing: border-box;
}


.video-fullscreen {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: black;
  overflow: hidden;
}

.video-fullscreen iframe {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  max-height: 100%;
  border: none;
}

* {
  backface-visibility: hidden;
  transform: translateZ(0);
}