add ingredient suggestions during recipe creation

frontend/src/components/IngredientAutocomplete.css

@@ -0,0 +1,200 @@
+.ingredient-autocomplete {
+  position: relative;
+  width: 100%;
+}
+
+.autocomplete-input-container {
+  position: relative;
+  width: 100%;
+}
+
+.autocomplete-input {
+  width: 100%;
+  padding: 0.75rem;
+  padding-right: 2.5rem;
+  border: 2px solid #e9ecef;
+  border-radius: 8px;
+  font-size: 1rem;
+  transition: border-color 0.3s ease, box-shadow 0.3s ease;
+  background: white;
+}
+
+.autocomplete-input:focus {
+  outline: none;
+  border-color: #FF6B35;
+  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
+}
+
+.autocomplete-loading {
+  position: absolute;
+  right: 0.75rem;
+  top: 50%;
+  transform: translateY(-50%);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.loading-spinner-small {
+  width: 16px;
+  height: 16px;
+  border: 2px solid #e9ecef;
+  border-top: 2px solid #FF6B35;
+  border-radius: 50%;
+  animation: spin 1s linear infinite;
+}
+
+@keyframes spin {
+  0% { transform: rotate(0deg); }
+  100% { transform: rotate(360deg); }
+}
+
+.autocomplete-suggestions {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  right: 0;
+  background: white;
+  border: 1px solid #e9ecef;
+  border-radius: 8px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+  z-index: 1000;
+  max-height: 200px;
+  overflow-y: auto;
+  margin-top: 4px;
+}
+
+.suggestion-item {
+  padding: 0.75rem;
+  cursor: pointer;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  transition: background-color 0.2s ease;
+  border-bottom: 1px solid #f8f9fa;
+}
+
+.suggestion-item:last-child {
+  border-bottom: none;
+}
+
+.suggestion-item:hover,
+.suggestion-item.selected {
+  background-color: #f8f9fa;
+}
+
+.suggestion-item.selected {
+  background-color: #e3f2fd;
+}
+
+.suggestion-name {
+  font-weight: 500;
+  color: #2c3e50;
+  flex: 1;
+}
+
+.suggestion-count {
+  font-size: 0.8rem;
+  color: #6c757d;
+  background: #e9ecef;
+  padding: 0.25rem 0.5rem;
+  border-radius: 12px;
+  white-space: nowrap;
+}
+
+/* Custom scrollbar for suggestions */
+.autocomplete-suggestions::-webkit-scrollbar {
+  width: 6px;
+}
+
+.autocomplete-suggestions::-webkit-scrollbar-track {
+  background: #f1f1f1;
+  border-radius: 3px;
+}
+
+.autocomplete-suggestions::-webkit-scrollbar-thumb {
+  background: #c1c1c1;
+  border-radius: 3px;
+}
+
+.autocomplete-suggestions::-webkit-scrollbar-thumb:hover {
+  background: #a8a8a8;
+}
+
+/* Responsive adjustments */
+@media (max-width: 768px) {
+  .autocomplete-suggestions {
+    max-height: 150px;
+  }
+  
+  .suggestion-item {
+    padding: 0.6rem;
+  }
+  
+  .suggestion-name {
+    font-size: 0.9rem;
+  }
+  
+  .suggestion-count {
+    font-size: 0.75rem;
+    padding: 0.2rem 0.4rem;
+  }
+}
+
+/* Animation for suggestions appearing */
+.autocomplete-suggestions {
+  animation: slideDown 0.2s ease-out;
+}
+
+@keyframes slideDown {
+  from {
+    opacity: 0;
+    transform: translateY(-10px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+/* Focus states for accessibility */
+.suggestion-item:focus {
+  outline: 2px solid #FF6B35;
+  outline-offset: -2px;
+}
+
+/* High contrast mode support */
+@media (prefers-contrast: high) {
+  .autocomplete-input {
+    border-color: #000;
+  }
+  
+  .autocomplete-input:focus {
+    border-color: #FF6B35;
+    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.3);
+  }
+  
+  .suggestion-item.selected {
+    background-color: #FF6B35;
+    color: white;
+  }
+  
+  .suggestion-item.selected .suggestion-count {
+    background: rgba(255, 255, 255, 0.2);
+    color: white;
+  }
+}
+
+/* Reduced motion support */
+@media (prefers-reduced-motion: reduce) {
+  .autocomplete-input,
+  .suggestion-item,
+  .loading-spinner-small {
+    transition: none;
+    animation: none;
+  }
+  
+  .autocomplete-suggestions {
+    animation: none;
+  }
+}