:root {
  --bg-color: #f7f7f7;
  --text-color: #111111;
  --accent-color: #666666;
  --gap: 20px;
  --transition-speed: 0.4s;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  padding: 40px 20px;
  max-width: 1400px;
  margin: 0 auto;
}

/* Header & Filter Nav */
.header {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 40px;
  gap: 20px;
}

.artist-name {
  font-weight: 300;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-size: 1.8rem;
}

.filter-nav {
  display: flex;
  gap: 15px;
}

.filter-btn {
  background: none;
  border: none;
  font-size: 0.95rem;
  color: var(--accent-color);
  cursor: pointer;
  padding: 5px 10px;
  transition: color var(--transition-speed) ease;
}

.filter-btn:hover,
.filter-btn.active {
  color: var(--text-color);
  font-weight: 600;
}

/* 3x3 Dynamic Grid Layout */
.grid-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  transition: all var(--transition-speed) ease;
}

.grid-item {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3 / 4;
  cursor: pointer;
  background-color: #e0e0e0;
  opacity: 1;
  transform: scale(1);
  transition: opacity var(--transition-speed) ease,
              transform var(--transition-speed) ease,
              visibility var(--transition-speed);
}

.grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-speed) ease;
}

/* Fluid Hover Effect */
.grid-item:hover img {
  transform: scale(1.03);
}

/* Filter Hide State */
.grid-item.is-hidden {
  opacity: 0;
  transform: scale(0.95);
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
  margin: 0;
  pointer-events: none;
}

/* Lightbox Styling */
.lightbox {
  border: none;
  background: rgba(0, 0, 0, 0.9);
  width: 100vw;
  height: 100vh;
  max-width: 100vw;
  max-height: 100vh;
  padding: 0;
}

.lightbox::backdrop {
  background: rgba(0, 0, 0, 0.9);
}

.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  object-fit: contain;
}

.close-btn {
  position: absolute;
  top: 20px;
  right: 30px;
  background: none;
  border: none;
  color: #ffffff;
  font-size: 2.5rem;
  cursor: pointer;
  z-index: 10;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .grid-container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .grid-container {
    grid-template-columns: 1fr;
  }
}