:root {
  --bg: #0f1724;
  --card-bg: #1a2333;
  --accent: #3b82f6;
  --text-primary: #e6eef6;
  --text-muted: #9aa4b2;
  --shadow: 0 8px 24px rgba(2, 6, 23, 0.7);
  --radius: 16px;
  --gap: 24px;
  --transition: all 0.3s ease;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color-scheme: dark;
}

body {
  margin: 0;
  background: linear-gradient(to bottom, #071021, #0f1724);
  color: var(--text-primary);
  padding: 60px 20px;
  line-height: 1.6;
}

h1 {
  text-align: center;
  margin-bottom: 40px;
  font-size: 2.5rem;
  letter-spacing: 1px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.gallery {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  max-width: 1200px;
  margin: 0 auto;
}

.card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: var(--transition);
  background: var(--card-bg);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 32px rgba(2, 6, 23, 0.8);
}

.card img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.card:hover img {
  transform: scale(1.08);
}

.overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px;
  background: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.85) 100%);
  color: var(--text-primary);
  transition: var(--transition);
  transform: translateY(20%);
  opacity: 0;
}

.card:hover .overlay {
  transform: translateY(0);
  opacity: 1;
}

.title {
  font-weight: bold;
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.rank {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--accent);
  color: #fff;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: bold;
  box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.95);
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lightbox.open {
  display: flex;
  opacity: 1;
}

.lightbox-content {
  position: relative;
  max-width: 90%;
  max-height: 80%;
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  animation: zoomIn 0.4s ease;
}

@keyframes zoomIn {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.lightbox img {
  width: 100%;
  height: auto;
  display: block;
}

.lightbox-caption {
  padding: 16px;
  text-align: center;
  background: rgba(0,0,0,0.7);
}

.lightbox-caption .title {
  font-size: 1.4rem;
}

.lightbox-caption .subtitle {
  font-size: 1rem;
}

.close, .prev, .next {
  position: absolute;
  background: rgba(255,255,255,0.15);
  border: none;
  font-size: 2.5rem;
  color: #fff;
  cursor: pointer;
  padding: 12px 20px;
  transition: var(--transition);
  border-radius: 50%;
}

.close:hover, .prev:hover, .next:hover {
  background: rgba(255,255,255,0.3);
}

.close { top: 20px; right: 20px; }
.prev { left: 30px; top: 50%; transform: translateY(-50%); }
.next { right: 30px; top: 50%; transform: translateY(-50%); }

/* Thumbnails in Lightbox */
.thumbnails {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 16px;
  background: rgba(0,0,0,0.7);
  overflow-x: auto;
}

.thumbnail {
  width: 60px;
  height: 60px;
  object-fit: cover;
  border-radius: 8px;
  cursor: pointer;
  opacity: 0.6;
  transition: var(--transition);
}

.thumbnail.active, .thumbnail:hover {
  opacity: 1;
  border: 2px solid var(--accent);
}

/* Accessibility */
.card:focus, button:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Loading Animation */
.card img {
  opacity: 0;
  transition: opacity 0.5s ease;
}

.card img.loaded {
  opacity: 1;
}

.loader {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 4px solid var(--text-muted);
  border-top: 4px solid var(--accent);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}