body {
  margin: 0;
  font-family: "Helvetica Neue", sans-serif;
  background: #050505;
  color: #fffefe;
}

header {
  text-align: center;
  padding: 60px 20px;
}

header h1 {
  font-size: 3rem;
  letter-spacing: 3px;
}

header p {
  color: #777;
}

/* Galerie style Saatchi */
.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
  padding: 40px;
}

.artwork {
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.artwork img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.artwork:hover img {
  transform: scale(1.05);
}

/* Overlay */
.overlay {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 20px;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: white;
  opacity: 0;
  transition: 0.4s;
}

.artwork:hover .overlay {
  opacity: 1;
}

/* Grande image */
.large {
  grid-column: span 2;
  grid-row: span 2;
}

/* Lightbox */
#lightbox {
  display: none;
  position: fixed;
  top:0;
  left:0;
  width:100%;
  height:100%;
  background: rgba(0,0,0,0.95);
  justify-content: center;
  align-items: center;
}

#lightbox img {
  max-width: 90%;
  max-height: 90%;
}

#close {
  position: absolute;
  top: 30px;
  right: 40px;
  color: white;
  font-size: 40px;
  cursor: pointer;
}