body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #111;
  color: #eee;
  text-align: center;
}

header {
  padding: 2em;
  background: #222;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 15px;
  padding: 20px;
}

.gallery img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(255,255,255,0.2);
  transition: transform 0.3s, box-shadow 0.3s;
  cursor: pointer;
}

.gallery img:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(255,255,255,0.5);
}

/* LIGHTBOX */
.lightbox {
  display: none;
  position: fixed;
  z-index: 9999;
  padding-top: 60px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.95);
}

.lightbox-content {
  margin: auto;
  display: block;
  max-width: 90%;
  max-height: 80vh;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(255,255,255,0.3);
}

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