/* Container slider + thumbnails */
.slider-container {
  display: flex;
  flex-wrap: nowrap;
  gap: 20px;
  max-width: 1200px;
  margin: 50px auto;
}

.slider-main {
  flex: 3;
  position: relative;
}

.slider-main .slider {
  position: relative;
  width: 100%;
  height: 70vh;
  min-height: 400px;
  max-height: 800px;
  overflow: hidden;
  border: 8px solid #eee;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.slider-main img {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1s ease-in-out;
  cursor: pointer;

  /* 🔑 blocca click sulle immagini nascoste */
  pointer-events: none;
}

.slider-main img.active {
  opacity: 1;

  /* 🔑 solo l’immagine attiva riceve click */
  pointer-events: auto;
}

/* Frecce slider */
.slider-main .arrow {
  position: absolute;
  top: 50%; transform: translateY(-50%);
  font-size: 40px;
  color: white;
  background: rgba(0,0,0,0.4);
  border-radius: 50%;
  padding: 10px;
  cursor: pointer;
  z-index: 10;
}
.slider-main .arrow.left { left: 15px; }
.slider-main .arrow.right { right: 15px; }
.slider-main .arrow:hover { background: rgba(0,0,0,0.7); }

/* Miniature a griglia quadrata uniforme */
.slider-thumbnails {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(50px, 1fr)); /* ✅ 50px */
  grid-auto-rows: 1fr;
  gap: 5px;
  border: 2px solid #000;
  padding: 8px;
  border-radius: 6px;
  background: #fafafa;
  max-height: 800px;
  overflow-y: auto;
}

.slider-thumbnails img {
  width: 100%;
  aspect-ratio: 1 / 1;   /* quadrato perfetto */
  object-fit: cover;      /* riempie il quadrato ritagliando l'immagine */
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 4px;
  transition: border 0.3s, transform 0.2s;
  display: block;
}

.slider-thumbnails img.active {
  border: 2px solid #2e7d32;
}

.slider-thumbnails img:hover {
  transform: scale(1.05);
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed; top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.9);
  justify-content: center;
  align-items: center;
  z-index: 1000;
  flex-direction: column;
}
.lightbox.open { display: flex; }

.lightbox img {
  max-width: 90%;
  max-height: 90%;
  border: 5px solid white;
  border-radius: 8px;
}

.lightbox-close {
  position: absolute;
  top: 20px; right: 30px;
  font-size: 40px; font-weight: bold;
  color: white; cursor: pointer;
  z-index: 1001; user-select: none;
}

/* Frecce lightbox */
.lb-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 50px;
  color: #fff;
  background: rgba(0,0,0,0.4);
  border-radius: 50%;
  padding: 12px;
  cursor: pointer;
  user-select: none;
  transition: background 0.3s;
  z-index: 1001;
}
.lb-arrow.left { left: 40px; }
.lb-arrow.right { right: 40px; }
.lb-arrow:hover { background: rgba(0,0,0,0.7); }

/* Filtri */
#filters { text-align: center; margin: 20px 0; }
.filter-btn {
  padding: 10px 18px;
  margin: 6px;
  cursor: pointer;
  border: 1px solid #2e7d32;
  border-radius: 6px;
  background: linear-gradient(#43a047, #2e7d32);
  color: #fff;
  font-weight: bold;
  box-shadow: 0 4px #1b5e20;
  transition: all 0.2s ease;
}
.filter-btn:hover { filter: brightness(1.1); }
.filter-btn:active {
  box-shadow: 0 2px #1b5e20;
  transform: translateY(2px);
}
.filter-btn.active {
  background: linear-gradient(#2e7d32, #1b5e20);
  color: #fff;
}

/* Responsive */
@media (max-width: 992px) {
  .slider-container { flex-direction: column; }
  .slider-thumbnails {
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr)); /* ✅ anche su mobile */
    grid-auto-rows: 1fr;
    width: 100%;
    overflow-x: auto;
  }
}