body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
#search {
  transition: box-shadow 0.2s, border-color 0.2s;
}
#search:focus {
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
  border-color: #f59e0b;
  outline: none;
}
.tag-btn, .cat-btn {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
@media (max-width: 480px) {
  header h1 { font-size: 1.25rem; }
  #results { grid-template-columns: 1fr; }
}
@media (min-width: 768px) {
  #results { grid-template-columns: repeat(2, 1fr); }
}