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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: #e8e8e8;
  min-height: 100vh;
  line-height: 1.6;
}

header {
  background: rgba(255, 255, 255, 0.05);
  padding: 2rem;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

header h1 {
  font-size: 2.5rem;
  color: #00d4ff;
  margin-bottom: 0.5rem;
}

header p {
  color: #888;
  font-size: 1.1rem;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

section {
  margin-bottom: 3rem;
}

h2 {
  color: #00d4ff;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  border-bottom: 2px solid rgba(0, 212, 255, 0.3);
  padding-bottom: 0.5rem;
}

.overview {
  background: rgba(255, 255, 255, 0.05);
  padding: 1.5rem;
  border-radius: 10px;
}

.file-grid, .age-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.file-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 1.2rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.file-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 20px rgba(0, 212, 255, 0.2);
  border-color: rgba(0, 212, 255, 0.3);
}

.file-card h3 {
  color: #4ecdc4;
  font-size: 1rem;
  margin-bottom: 0.5rem;
  font-family: 'Monaco', 'Consolas', monospace;
}

.file-card p {
  color: #aaa;
  font-size: 0.9rem;
}

.age-card {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  padding: 1.5rem;
  text-align: center;
}

.age-card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.age-card p {
  color: #aaa;
  margin: 0.3rem 0;
}

.age-card.mini {
  border: 2px solid #ff6b6b;
}
.age-card.mini h3 {
  color: #ff6b6b;
}

.age-card.little {
  border: 2px solid #4ecdc4;
}
.age-card.little h3 {
  color: #4ecdc4;
}

.age-card.big {
  border: 2px solid #ffe66d;
}
.age-card.big h3 {
  color: #ffe66d;
}

.instructions {
  background: rgba(255, 255, 255, 0.05);
  padding: 1.5rem;
  border-radius: 10px;
}

.instructions ol {
  margin-left: 1.5rem;
}

.instructions li {
  margin: 0.8rem 0;
  color: #ccc;
}

footer {
  text-align: center;
  padding: 2rem;
  color: #666;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 600px) {
  header h1 {
    font-size: 1.8rem;
  }
  
  main {
    padding: 1rem;
  }
  
  .file-grid, .age-grid {
    grid-template-columns: 1fr;
  }
}