.sdg-banner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-auto-rows: 1fr;
  gap: 0;
  padding: 0;
}

.sdg {
  aspect-ratio: 1 / 1;   /* makes each cell square */
  width: 100%;
  height: auto;
  cursor: pointer;
  margin: 0;
  padding: 0;
}


.flip-card {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 1s ease;
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;

  display: flex;
  align-items: center;
  justify-content: center;
}

.flip-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0;
  border: none;
  backface-visibility: hidden;
}

.flip-face img {
  width: 100%;
  height: 100%;
  object-fit: contain;  /* keeps icon square */
  margin: 0;
  padding: 0;
  border: none;
}


.flip-back {
  transform: rotateY(180deg);
}


  /* Modal */
  .modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 999;
  }

  .modal {
    background: #fff;
    border-radius: 12px;
    max-width: 420px;
    width: 90%;
    padding: 20px;
    text-align: left;
    box-shadow: 0 16px 40px rgba(0,0,0,0.25);
  }

  .modal-close {
    margin-top: 10px;
    padding: 6px 14px;
    border-radius: 999px;
    border: none;
    background: #333;
    color: #fff;
    cursor: pointer;
  }
  
@media (max-width: 768px) {
     .sdg-banner {
  grid-template-columns: repeat(6, 1fr);}
}