/* ===== Modern Gallery ===== */

.grid-container {
  column-count: 4;
  column-gap: 15px;
  padding: 20px;
}

@media (max-width: 1200px) {
  .grid-container { column-count: 3; }
}
@media (max-width: 768px) {
  .grid-container { column-count: 2; }
}
@media (max-width: 480px) {
  .grid-container { column-count: 1; }
}

.grid-item {
  break-inside: avoid;
  margin-bottom: 15px;
  cursor: pointer;
  overflow: hidden;
  border-radius: 15px;
}

.grid-item img {
  width: 100%;
  display: block;
  border-radius: 15px;
  transition: transform 0.4s ease, filter 0.4s ease;
}

.grid-item:hover img {
  transform: scale(1.05);
  filter: brightness(0.85);
}

/* ===== Lightbox ===== */

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  visibility: hidden;
  opacity: 0;
  transition: 0.4s ease;
  z-index: 9999;
}

.lightbox.active {
  visibility: visible;
  opacity: 1;
}

.lightbox img {
  max-width: 90%;
  max-height: 85%;
  border-radius: 10px;
}

.close-btn {
  position: absolute;
  top: 25px;
  right: 40px;
  font-size: 35px;
  color: white;
  cursor: pointer;
}

.nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 40px;
  color: white;
  cursor: pointer;
  padding: 10px 20px;
}

.prev { left: 20px; }
.next { right: 20px; }