/* --------------------------
   Thumbnail styles
-------------------------- */
.thumb-container {
  margin: 20px 0;
  text-align: center;
}

.thumb-container h3 {
  margin-bottom: 8px;
  font-size: 1.2rem;
  color: #333;
}

.thumb-container img {
  width: 200px;
  height: auto;
  cursor: pointer;
  border-radius: 4px;
  box-shadow: 0 0 4px rgba(0,0,0,0.2);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

@media (hover: hover) and (pointer: fine) {
  .thumb-container img:hover {
    transform: scale(1.03);
    box-shadow: 0 4px 10px rgba(0,0,0,0.3),
                0 0 6px rgba(255,255,255,0.25);
  }
}

/* --------------------------
   Overlay container
-------------------------- */
#overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: rgba(0,0,0,0.8);
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: background 0.3s ease, opacity 0.3s ease;
}

#overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* --------------------------
   Image wrapper
-------------------------- */
#overlay-img-wrapper {
  position: relative;
  display: inline-block;
  max-width: 90%;
  max-height: 80%;
}

/* Expanded image */
#overlay-img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.6);
  cursor: grab;
  transition: transform 0.3s ease;
  display: block;
}

/* --------------------------
   Close button
-------------------------- */
#close-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 24px;
  color: #fff;
  background: rgba(0,0,0,0.5);
  border-radius: 50%;
  padding: 4px 10px;
  cursor: pointer;
  opacity: 0.5; /* idle dim default */
  transition: opacity 0.3s ease, transform 0.3s ease;
  user-select: none;
}

/* --------------------------
   Title (anchored below image)
-------------------------- */
#overlay-title {
  position: absolute;
  bottom: -32px;   /* sits just below image wrapper */
  left: 50%;
  transform: translateX(-50%);
  font-size: 1.3rem;
  font-weight: bold;
  color: #fff;
  white-space: nowrap;
  opacity: 0.7; /* idle default */
  transition: opacity 0.3s ease;
}

/* --------------------------
   Arrows
-------------------------- */
#nav-left, #nav-right {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 40px;
  color: #fff;
  background: rgba(0,0,0,0.5);
  border-radius: 50%;
  padding: 8px 14px;
  cursor: pointer;
  opacity: 0.5; /* idle dim default */
  transition: opacity 0.3s ease, transform 0.3s ease;
  user-select: none;
}

#nav-left { left: 20px; }
#nav-right { right: 20px; }

/* Hide arrows on touch devices */
@media (hover: none) and (pointer: coarse) {
  #nav-left, #nav-right {
    display: none;
  }
}