body { font-family: Arial, sans-serif; margin:0; padding:0; background:#f0f8ff; }
header { background:#4facfe; color:white; padding:20px; text-align:center; }

.gallery-container { position: relative; max-width:1000px; margin:20px auto; }

.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}

.gallery img {
  width:100%;
  height:150px;
  object-fit: cover;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.3s;
}
.gallery img:hover { transform: scale(1.05); }

.nav-btn {
  position:absolute;
  top:50%;
  transform:translateY(-50%);
  background:#4facfe;
  color:white;
  border:none;
  font-size:1.5em;
  padding:10px;
  cursor:pointer;
  border-radius:50%;
}
#prev { left:-50px; }
#next { right:-50px; }

.modal {
  display:none;
  position: fixed;
  z-index: 100;
  padding-top: 60px;
  left:0; top:0;
  width:100%; height:100%;
  background-color: rgba(0,0,0,0.8);
}

.modal-content {
  margin:auto;
  display:block;
  max-width:80%;
  max-height:80%;
  border-radius:10px;
}

.close {
  position:absolute;
  top:20px;
  right:35px;
  color:white;
  font-size:40px;
  font-weight:bold;
  cursor:pointer;
}