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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f5f5f5;
  color: #333;
  line-height: 1.5;
}

header {
  background: #2c3e50;
  color: white;
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  font-size: 1.5rem;
}

.download-btn {
  background: #27ae60;
  color: white;
  padding: 0.5rem 1rem;
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.9rem;
}

.download-btn:hover {
  background: #219a52;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
}

.search-section {
  margin-bottom: 2rem;
}

#search-input {
  width: 100%;
  padding: 1rem;
  font-size: 1.1rem;
  border: 2px solid #ddd;
  border-radius: 8px;
  margin-bottom: 1rem;
}

#search-input:focus {
  outline: none;
  border-color: #3498db;
}

.book-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.filter-btn {
  padding: 0.4rem 0.8rem;
  border: 2px solid #ddd;
  background: white;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
  background-color: var(--book-color, #fff);
}

.filter-btn:hover {
  border-color: #3498db;
}

.filter-btn.active {
  background: #2c3e50;
  color: white;
  border-color: #2c3e50;
}

.results-info {
  font-size: 0.9rem;
  color: #666;
}

.results-section {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.entry {
  background: white;
  padding: 1rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.entry.sub-entry {
  margin-left: 2rem;
  background: #fafafa;
}

.entry-name {
  flex: 1;
  font-weight: 500;
}

.illus-indicator {
  font-size: 1rem;
}

.entry-page {
  color: #666;
  font-size: 0.9rem;
}

.book-badge {
  background: var(--badge-color, #3498db);
  color: white;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: bold;
}

.children {
  width: 100%;
  margin-top: 0.5rem;
}

.no-results, .error {
  text-align: center;
  color: #666;
  padding: 2rem;
}

.error {
  color: #e74c3c;
}

@media (max-width: 600px) {
  header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  main {
    padding: 1rem;
  }
  
  .entry.sub-entry {
    margin-left: 1rem;
  }
}