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

body {
  min-height: 100vh;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: #e8e8e8;
  padding: 2rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

header {
  text-align: center;
  padding: 3rem 1rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  background: linear-gradient(90deg, #ffd700, #ff6b6b, #c56cf0, #7bed9f);
  background-size: 300% 300%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 5s ease infinite;
}

@keyframes shimmer {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.subtitle {
  margin-top: 1rem;
  font-size: 1.2rem;
  opacity: 0.7;
  font-style: italic;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  padding: 2rem 0;
}

.reveal-card {
  position: relative;
  height: 300px;
  border-radius: 20px;
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.cover {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: clip-path 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  clip-path: circle(150% at 50% 50%);
  z-index: 2;
}

.reveal-card:hover .cover {
  clip-path: circle(0% at 50% 50%);
}

.pattern {
  position: absolute;
  inset: 0;
}

.label {
  position: relative;
  z-index: 3;
  font-size: 1.2rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: white;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
  padding: 1rem 2rem;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50px;
  backdrop-filter: blur(5px);
  transition: transform 0.3s, opacity 0.3s;
}

.reveal-card:hover .label {
  transform: scale(0.8);
  opacity: 0;
}

/* Pattern backgrounds */
.aurora-pattern {
  background:
    linear-gradient(45deg, #00d9ff, #00ff88, #ff00ff),
    repeating-linear-gradient(90deg, transparent, transparent 10px, rgba(255,255,255,0.1) 10px, rgba(255,255,255,0.1) 20px);
  background-blend-mode: overlay;
  animation: aurora-move 3s ease-in-out infinite;
}

@keyframes aurora-move {
  0%, 100% { filter: hue-rotate(0deg); }
  50% { filter: hue-rotate(30deg); }
}

.ocean-pattern {
  background:
    repeating-linear-gradient(180deg, #001f3f, #001f3f 4px, #003366 4px, #003366 8px),
    radial-gradient(ellipse at 50% 100%, #0074D9, transparent);
  background-blend-mode: multiply;
}

.cosmic-pattern {
  background:
    radial-gradient(circle at 30% 30%, #9b59b6, transparent 30%),
    radial-gradient(circle at 70% 60%, #3498db, transparent 40%),
    radial-gradient(circle at 50% 80%, #e74c3c, transparent 30%),
    #0a0a1a;
}

.forest-pattern {
  background:
    linear-gradient(180deg, #2d5a27 0%, #1a3d1a 50%, #0d1f0d 100%),
    repeating-linear-gradient(90deg, transparent, transparent 30px, rgba(0,0,0,0.1) 30px, rgba(0,0,0,0.1) 60px);
}

.desert-pattern {
  background:
    linear-gradient(180deg, #f39c12 0%, #d35400 50%, #8b4513 100%),
    repeating-conic-gradient(from 0deg, transparent 0deg 10deg, rgba(255,255,255,0.1) 10deg 20deg);
}

.crystal-pattern {
  background:
    conic-gradient(from 0deg at 50% 50%, #a8e6cf, #88d8b0, #6cc3a1, #55b08d, #3d9d7a, #55b08d, #6cc3a1, #88d8b0, #a8e6cf),
    linear-gradient(135deg, #667eea, #764ba2);
  background-blend-mode: overlay;
}

/* Hidden content styles */
.hidden-content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
  z-index: 1;
}

.hidden-content h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  transform: translateY(20px);
  opacity: 0;
  transition: transform 0.5s 0.2s, opacity 0.5s 0.2s;
}

.hidden-content p {
  font-size: 1rem;
  line-height: 1.6;
  max-width: 280px;
  transform: translateY(20px);
  opacity: 0;
  transition: transform 0.5s 0.3s, opacity 0.5s 0.3s;
}

.reveal-card:hover .hidden-content h2,
.reveal-card:hover .hidden-content p {
  transform: translateY(0);
  opacity: 1;
}

/* Hidden content themes */
.aurora {
  background: linear-gradient(135deg, #1a1a3e, #2d1b4e);
}

.aurora h2 { color: #7bed9f; }

.ocean {
  background: linear-gradient(135deg, #001f3f, #003366);
}

.ocean h2 { color: #00d9ff; }

.cosmic {
  background: linear-gradient(135deg, #0a0a1a, #1a1a3a);
}

.cosmic h2 { color: #e74c3c; }

.forest {
  background: linear-gradient(135deg, #1a3d1a, #0d2f0d);
}

.forest h2 { color: #7bed9f; }

.desert {
  background: linear-gradient(135deg, #4a2c00, #2d1a00);
}

.desert h2 { color: #f39c12; }

.crystal {
  background: linear-gradient(135deg, #2c2c54, #1a1a2e);
}

.crystal h2 { color: #a8e6cf; }

footer {
  text-align: center;
  padding: 3rem 1rem;
  opacity: 0.6;
  font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
  body {
    padding: 1rem;
  }

  header {
    padding: 2rem 1rem;
  }

  .gallery {
    gap: 1.5rem;
  }

  .reveal-card {
    height: 250px;
  }

  .label {
    font-size: 1rem;
    padding: 0.75rem 1.5rem;
  }
}

/* Touch devices - use active state */
@media (hover: none) {
  .reveal-card:active .cover {
    clip-path: circle(0% at 50% 50%);
  }

  .reveal-card:active .label {
    transform: scale(0.8);
    opacity: 0;
  }

  .reveal-card:active .hidden-content h2,
  .reveal-card:active .hidden-content p {
    transform: translateY(0);
    opacity: 1;
  }
}