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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

header p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 1.5rem;
}

main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1rem;
}

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

.example-card {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s, box-shadow 0.2s;
}

.example-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15);
}

.example-card.placeholder {
  opacity: 0.6;
}

.example-card h2 {
  color: #667eea;
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

.example-card p {
  color: #666;
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 500;
  transition: opacity 0.2s;
}

.btn:hover {
  opacity: 0.9;
}

.btn.disabled {
  background: #ccc;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-outline {
  background: transparent;
  border: 2px solid white;
  color: white;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
  opacity: 1;
}

footer {
  text-align: center;
  padding: 2rem;
  color: white;
  opacity: 0.8;
}

@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }

  .examples-grid {
    grid-template-columns: 1fr;
  }
}