changes

angular.json

@@ -175,26 +175,6 @@
         },
         "extract-i18n": {
           "builder": "@angular/build:extract-i18n"
-        },
-        "test": {
-          "builder": "@angular/build:karma",
-          "options": {
-            "polyfills": [
-              "zone.js",
-              "zone.js/testing"
-            ],
-            "tsConfig": "tsconfig.spec.json",
-            "inlineStyleLanguage": "scss",
-            "assets": [
-              {
-                "glob": "**/*",
-                "input": "public"
-              }
-            ],
-            "styles": [
-              "src/styles.scss"
-            ]
-          }
         }
       }
     }

nginx.conf

@@ -36,6 +36,9 @@ server {
     add_header X-Frame-Options "SAMEORIGIN" always;
     add_header X-Content-Type-Options "nosniff" always;
     add_header X-XSS-Protection "1; mode=block" always;
+    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
+    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://telegram.org; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data: https:; connect-src 'self' https:; frame-src https://telegram.org;" always;
     
     # Brotli compression (if available)
     # brotli on;

public/manifest.novo.webmanifest

@@ -1,5 +1,4 @@
 {
-  "$schema": "./node_modules/@angular/service-worker/config/schema.json",
   "name": "Novo Market - Интернет-магазин",
   "short_name": "Novo",
   "description": "Novo Market - ваш онлайн магазин качественных товаров с доставкой",
@@ -12,34 +11,10 @@
   "categories": ["shopping", "lifestyle"],
   "icons": [
     {
-      "src": "icons/icon-72x72.png",
+      "src": "assets/images/novo-favicon.svg",
-      "sizes": "72x72",
+      "sizes": "any",
-      "type": "image/png",
+      "type": "image/svg+xml",
-      "purpose": "maskable any"
+      "purpose": "any"
-    },
-    {
-      "src": "icons/icon-96x96.png",
-      "sizes": "96x96",
-      "type": "image/png",
-      "purpose": "maskable any"
-    },
-    {
-      "src": "icons/icon-128x128.png",
-      "sizes": "128x128",
-      "type": "image/png",
-      "purpose": "maskable any"
-    },
-    {
-      "src": "icons/icon-144x144.png",
-      "sizes": "144x144",
-      "type": "image/png",
-      "purpose": "maskable any"
-    },
-    {
-      "src": "icons/icon-152x152.png",
-      "sizes": "152x152",
-      "type": "image/png",
-      "purpose": "maskable any"
     },
     {
       "src": "icons/icon-192x192.png",
@@ -47,12 +22,6 @@
       "type": "image/png",
       "purpose": "maskable any"
     },
-    {
-      "src": "icons/icon-384x384.png",
-      "sizes": "384x384",
-      "type": "image/png",
-      "purpose": "maskable any"
-    },
     {
       "src": "icons/icon-512x512.png",
       "sizes": "512x512",

public/manifest.webmanifest

@@ -11,34 +11,10 @@
   "categories": ["shopping", "marketplace"],
   "icons": [
     {
-      "src": "icons/icon-72x72.png",
+      "src": "assets/images/dexar-favicon.svg",
-      "sizes": "72x72",
+      "sizes": "any",
-      "type": "image/png",
+      "type": "image/svg+xml",
-      "purpose": "maskable any"
+      "purpose": "any"
-    },
-    {
-      "src": "icons/icon-96x96.png",
-      "sizes": "96x96",
-      "type": "image/png",
-      "purpose": "maskable any"
-    },
-    {
-      "src": "icons/icon-128x128.png",
-      "sizes": "128x128",
-      "type": "image/png",
-      "purpose": "maskable any"
-    },
-    {
-      "src": "icons/icon-144x144.png",
-      "sizes": "144x144",
-      "type": "image/png",
-      "purpose": "maskable any"
-    },
-    {
-      "src": "icons/icon-152x152.png",
-      "sizes": "152x152",
-      "type": "image/png",
-      "purpose": "maskable any"
     },
     {
       "src": "icons/icon-192x192.png",
@@ -46,12 +22,6 @@
       "type": "image/png",
       "purpose": "maskable any"
     },
-    {
-      "src": "icons/icon-384x384.png",
-      "sizes": "384x384",
-      "type": "image/png",
-      "purpose": "maskable any"
-    },
     {
       "src": "icons/icon-512x512.png",
       "sizes": "512x512",

src/app/app.html

@@ -12,10 +12,10 @@
   </div>
 } @else {
   <app-header></app-header>
-  @if (!isHomePage()) {
-    <app-back-button />
-  }
   <main class="main-content">
+    @if (!isHomePage()) {
+      <app-back-button />
+    }
     <router-outlet></router-outlet>
   </main>
   <app-footer></app-footer>

src/app/app.spec.ts

@@ -1,18 +0,0 @@
-import { TestBed } from '@angular/core/testing';
-import { App } from './app';
-import { provideRouter } from '@angular/router';
-
-describe('App', () => {
-  beforeEach(async () => {
-    await TestBed.configureTestingModule({
-      imports: [App],
-      providers: [provideRouter([])]
-    }).compileComponents();
-  });
-
-  it('should create the app', () => {
-    const fixture = TestBed.createComponent(App);
-    const app = fixture.componentInstance;
-    expect(app).toBeTruthy();
-  });
-});

src/app/components/back-button/back-button.component.ts

@@ -17,14 +17,16 @@ import { TranslateService } from '../../i18n/translate.service';
   `,
   styles: [`
     .dexar-back-btn {
-      position: fixed;
+      position: sticky;
-      top: 76px;
+      top: 72px;
       left: 20px;
       z-index: 100;
       background: none;
       border: none;
       cursor: pointer;
-      padding: 4px;
+      padding: 8px 4px;
+      margin-bottom: -40px;
+      width: fit-content;
       transition: transform 0.2s ease;
       
       svg path {
@@ -47,7 +49,7 @@ import { TranslateService } from '../../i18n/translate.service';
 
     @media (max-width: 768px) {
       .dexar-back-btn {
-        top: 68px;
+        top: 64px;
         left: 12px;
         
         svg {

src/app/components/header/header.component.html

@@ -29,8 +29,8 @@
       <div class="novo-right">
         <app-language-selector />
         
-        <a [routerLink]="'/cart' | langRoute" routerLinkActive="novo-cart-active" class="novo-cart" (click)="closeMenu()">
+        <a [routerLink]="'/cart' | langRoute" routerLinkActive="novo-cart-active" class="novo-cart" (click)="closeMenu()" [attr.aria-label]="'header.cart' | translate">
-          <svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+          <svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
             <circle cx="9" cy="21" r="1"></circle>
             <circle cx="20" cy="21" r="1"></circle>
             <path d="M1 1h4l2.68 13.39a2 2 0 0 0 2 1.61h9.72a2 2 0 0 0 2-1.61L23 6H6"></path>
@@ -40,7 +40,7 @@
           }
         </a>
         
-        <button class="menu-toggle" (click)="toggleMenu()" [class.active]="menuOpen">
+        <button class="menu-toggle" (click)="toggleMenu()" [class.active]="menuOpen" [attr.aria-label]="menuOpen ? 'Close menu' : 'Open menu'" [attr.aria-expanded]="menuOpen">
           <span></span>
           <span></span>
           <span></span>
@@ -112,7 +112,7 @@
         </div>
 
         <!-- Mobile Menu Toggle -->
-        <button class="dexar-menu-toggle" (click)="toggleMenu()" [class.active]="menuOpen">
+        <button class="dexar-menu-toggle" (click)="toggleMenu()" [class.active]="menuOpen" [attr.aria-label]="menuOpen ? 'Close menu' : 'Open menu'" [attr.aria-expanded]="menuOpen">
           <span></span>
           <span></span>
           <span></span>

src/app/components/language-selector/language-selector.component.html

@@ -1,5 +1,5 @@
-<div class="language-selector">
+<div class="language-selector" role="listbox">
-  <button class="language-button" (click)="toggleDropdown()">
+  <button class="language-button" (click)="toggleDropdown()" (keydown)="onKeyDown($event)" aria-haspopup="listbox" [attr.aria-expanded]="dropdownOpen">
     <img [src]="languageService.getCurrentLanguage()?.flagSvg" 
          [alt]="languageService.getCurrentLanguage()?.name" 
          class="language-flag">
@@ -13,6 +13,8 @@
     @for (lang of languageService.languages; track lang.code) {
       <button 
         class="language-option" 
+        role="option"
+        [attr.aria-selected]="languageService.currentLanguage() === lang.code"
         [class.active]="languageService.currentLanguage() === lang.code"
         [class.disabled]="!lang.enabled"
         [disabled]="!lang.enabled"

src/app/components/language-selector/language-selector.component.ts

@@ -31,6 +31,15 @@ export class LanguageSelectorComponent {
     this.dropdownOpen = false;
   }
 
+  onKeyDown(event: KeyboardEvent): void {
+    if (event.key === 'Escape') {
+      this.dropdownOpen = false;
+    } else if (event.key === 'Enter' || event.key === ' ') {
+      event.preventDefault();
+      this.toggleDropdown();
+    }
+  }
+
   @HostListener('document:click', ['$event'])
   onClickOutside(event: Event): void {
     if (!this.elementRef.nativeElement.contains(event.target)) {

src/app/config/constants.ts

@@ -0,0 +1,19 @@
+// Payment polling
+export const PAYMENT_POLL_INTERVAL_MS = 5000;
+export const PAYMENT_MAX_CHECKS = 36;
+export const PAYMENT_TIMEOUT_CLOSE_MS = 3000;
+export const PAYMENT_ERROR_CLOSE_MS = 4000;
+export const LINK_COPIED_DURATION_MS = 2000;
+
+// Infinite scroll
+export const SCROLL_THRESHOLD_PX = 1200;
+export const SCROLL_DEBOUNCE_MS = 100;
+export const ITEMS_PER_PAGE = 20;
+
+// Search
+export const SEARCH_DEBOUNCE_MS = 300;
+export const SEARCH_MIN_LENGTH = 3;
+
+// Cache
+export const CACHE_DURATION_MS = 5 * 60 * 1000;
+export const CATEGORY_CACHE_DURATION_MS = 2 * 60 * 1000;

src/app/interceptors/cache.interceptor.ts

@@ -2,8 +2,9 @@ import { HttpInterceptorFn, HttpResponse } from '@angular/common/http';
 import { of } from 'rxjs';
 import { tap } from 'rxjs/operators';
 
+import { CACHE_DURATION_MS, CATEGORY_CACHE_DURATION_MS } from '../config/constants';
+
 const cache = new Map<string, { response: HttpResponse<unknown>, timestamp: number }>();
-const CACHE_DURATION = 5 * 60 * 1000; // 5 минут
 
 export const cacheInterceptor: HttpInterceptorFn = (req, next) => {
   // Кэшируем только GET запросы
@@ -11,12 +12,16 @@ export const cacheInterceptor: HttpInterceptorFn = (req, next) => {
     return next(req);
   }
 
-  // Кэшируем только запросы списка категорий (не товары категорий)
+  // Кэшируем списки категорий, товары категорий и отдельные товары
-  const shouldCache = req.url.match(/\/category$/) !== null;
+  const isCategoryList = /\/category$/.test(req.url);
-  if (!shouldCache) {
+  const isCategoryItems = /\/category\/\d+/.test(req.url);
+  const isItem = /\/item\/\d+/.test(req.url);
+  if (!isCategoryList && !isCategoryItems && !isItem) {
     return next(req);
   }
 
+  const ttl = isCategoryList ? CACHE_DURATION_MS : CATEGORY_CACHE_DURATION_MS;
+
   // Cleanup expired entries before checking
   cleanupExpiredCache();
 
@@ -25,7 +30,7 @@ export const cacheInterceptor: HttpInterceptorFn = (req, next) => {
   // Проверяем наличие и актуальность кэша
   if (cachedResponse) {
     const age = Date.now() - cachedResponse.timestamp;
-    if (age < CACHE_DURATION) {
+    if (age < ttl) {
       return of(cachedResponse.response.clone());
     } else {
       cache.delete(req.url);
@@ -53,7 +58,7 @@ export function clearCache(): void {
 function cleanupExpiredCache(): void {
   const now = Date.now();
   for (const [url, data] of cache.entries()) {
-    if (now - data.timestamp >= CACHE_DURATION) {
+    if (now - data.timestamp >= CACHE_DURATION_MS) {
       cache.delete(url);
     }
   }

src/app/pages/cart/cart.component.ts

@@ -12,6 +12,7 @@ import { getDiscountedPrice, getMainImage, trackByItemId } from '../../utils/ite
 import { LangRoutePipe } from '../../pipes/lang-route.pipe';
 import { TranslatePipe } from '../../i18n/translate.pipe';
 import { TranslateService } from '../../i18n/translate.service';
+import { PAYMENT_POLL_INTERVAL_MS, PAYMENT_MAX_CHECKS, PAYMENT_TIMEOUT_CLOSE_MS, PAYMENT_ERROR_CLOSE_MS, LINK_COPIED_DURATION_MS } from '../../config/constants';
 
 @Component({
   selector: 'app-cart',
@@ -50,7 +51,7 @@ export class CartComponent implements OnDestroy {
   emailSubmitting = signal<boolean>(false);
   paidItems: CartItem[] = [];
   
-  maxChecks = 36; // 36 checks * 5 seconds = 180 seconds (3 minutes)
+  maxChecks = PAYMENT_MAX_CHECKS;
   private pollingSubscription?: Subscription;
   private closeTimeout?: ReturnType<typeof setTimeout>;
 
@@ -196,14 +197,14 @@ export class CartComponent implements OnDestroy {
         if (this.closeTimeout) clearTimeout(this.closeTimeout);
         this.closeTimeout = setTimeout(() => {
           this.closePaymentPopup();
-        }, 4000);
+        }, PAYMENT_ERROR_CLOSE_MS);
       }
     });
   }
 
   startPolling(): void {
     this.stopPolling();
-    this.pollingSubscription = interval(5000) // every 5 seconds
+    this.pollingSubscription = interval(PAYMENT_POLL_INTERVAL_MS)
       .pipe(
         take(this.maxChecks), // maximum 36 checks (3 minutes)
         switchMap(() => {
@@ -230,7 +231,7 @@ export class CartComponent implements OnDestroy {
             if (this.closeTimeout) clearTimeout(this.closeTimeout);
             this.closeTimeout = setTimeout(() => {
               this.closePaymentPopup();
-            }, 3000);
+            }, PAYMENT_TIMEOUT_CLOSE_MS);
           }
         },
         error: (err) => {
@@ -239,7 +240,7 @@ export class CartComponent implements OnDestroy {
           if (this.closeTimeout) clearTimeout(this.closeTimeout);
           this.closeTimeout = setTimeout(() => {
             this.closePaymentPopup();
-          }, 3000);
+          }, PAYMENT_TIMEOUT_CLOSE_MS);
         }
       });
   }
@@ -255,7 +256,7 @@ export class CartComponent implements OnDestroy {
     if (url) {
       navigator.clipboard.writeText(url).then(() => {
         this.linkCopied.set(true);
-        setTimeout(() => this.linkCopied.set(false), 2000);
+        setTimeout(() => this.linkCopied.set(false), LINK_COPIED_DURATION_MS);
       }).catch(err => {
         console.error(this.i18n.t('cart.copyError'), err);
       });

src/app/pages/category/category.component.html

@@ -9,7 +9,7 @@
   @if (!error()) {
     <div class="items-grid">
       @for (item of items(); track trackByItemId($index, item)) {
-        <div class="item-card">
+        <div class="item-card" (mouseenter)="onItemHover(item.itemID)">
           <a [routerLink]="['/item', item.itemID] | langRoute" class="item-link">
             <div class="item-image">
               <img [src]="getMainImage(item)" [alt]="item.name" loading="lazy" decoding="async" />
@@ -45,7 +45,7 @@
             </div>
           </a>
           
-          <button class="add-to-cart-btn" (click)="addToCart(item.itemID, $event)">
+          <button class="add-to-cart-btn" (click)="addToCart(item.itemID, $event)" [attr.aria-label]="('category.addToCart' | translate) + ': ' + item.name">
             {{ 'category.addToCart' | translate }}
           </button>
         </div>

src/app/pages/category/category.component.ts

@@ -2,11 +2,13 @@ import { Component, OnInit, OnDestroy, signal, HostListener, ChangeDetectionStra
 import { DecimalPipe } from '@angular/common';
 import { ActivatedRoute, RouterLink } from '@angular/router';
 import { ApiService, CartService } from '../../services';
+import { PrefetchService } from '../../services/prefetch.service';
 import { Item } from '../../models';
 import { Subscription } from 'rxjs';
 import { getDiscountedPrice, getMainImage, trackByItemId } from '../../utils/item.utils';
 import { LangRoutePipe } from '../../pipes/lang-route.pipe';
 import { TranslatePipe } from '../../i18n/translate.pipe';
+import { SCROLL_THRESHOLD_PX, SCROLL_DEBOUNCE_MS, ITEMS_PER_PAGE } from '../../config/constants';
 
 @Component({
   selector: 'app-category',
@@ -23,7 +25,7 @@ export class CategoryComponent implements OnInit, OnDestroy {
   hasMore = signal(true);
   
   private skip = 0;
-  private readonly count = 20;
+  private readonly count = ITEMS_PER_PAGE;
   private isLoadingMore = false;
   private routeSubscription?: Subscription;
   private scrollTimeout?: ReturnType<typeof setTimeout>;
@@ -31,7 +33,8 @@ export class CategoryComponent implements OnInit, OnDestroy {
   constructor(
     private route: ActivatedRoute,
     private apiService: ApiService,
-    private cartService: CartService
+    private cartService: CartService,
+    private prefetchService: PrefetchService
   ) {}
 
   ngOnInit(): void {
@@ -90,12 +93,12 @@ export class CategoryComponent implements OnInit, OnDestroy {
     
     this.scrollTimeout = setTimeout(() => {
       const scrollPosition = window.innerHeight + window.scrollY;
-      const bottomPosition = document.documentElement.scrollHeight - 1200;
+      const bottomPosition = document.documentElement.scrollHeight - SCROLL_THRESHOLD_PX;
 
       if (scrollPosition >= bottomPosition && !this.loading() && this.hasMore() && !this.isLoadingMore) {
         this.loadItems();
       }
-    }, 100);
+    }, SCROLL_DEBOUNCE_MS);
   }
 
   addToCart(itemID: number, event: Event): void {
@@ -104,6 +107,10 @@ export class CategoryComponent implements OnInit, OnDestroy {
     this.cartService.addItem(itemID);
   }
 
+  onItemHover(itemID: number): void {
+    this.prefetchService.prefetchItem(itemID);
+  }
+
   readonly skeletonSlots = Array.from({ length: 8 });
   readonly getDiscountedPrice = getDiscountedPrice;
   readonly getMainImage = getMainImage;

src/app/pages/home/home.component.html

@@ -19,10 +19,23 @@
     <app-items-carousel />
 
     @if (loading()) {
-      <div class="novo-loading">
+      <section class="novo-categories">
-        <div class="novo-spinner"></div>
+        <div class="novo-section-header">
-        <p>​{{ 'home.loading' | translate }}</p>
+          <div class="skeleton-line" style="height: 32px; width: 200px; margin: 0 auto 12px;"></div>
-      </div>
+          <div class="skeleton-line" style="height: 18px; width: 300px; margin: 0 auto;"></div>
+        </div>
+        <div class="novo-categories-grid">
+          @for (i of skeletonSlots; track i) {
+            <div class="novo-category-card skeleton-card">
+              <div class="novo-category-image skeleton-image"></div>
+              <div class="novo-category-info">
+                <div class="skeleton-line" style="height: 18px; width: 70%;"></div>
+                <div class="skeleton-line" style="height: 18px; width: 20px;"></div>
+              </div>
+            </div>
+          }
+        </div>
+      </section>
     }
 
     @if (error()) {
@@ -101,10 +114,20 @@
     <app-items-carousel />
 
     @if (loading()) {
-      <div class="dexar-loading">
+      <section class="dexar-categories">
-        <div class="dexar-spinner"></div>
+        <div class="skeleton-line" style="height: 36px; width: 220px; margin-bottom: 40px;"></div>
-        <p>{{ 'home.loadingDexar' | translate }}</p>
+        <div class="dexar-categories-grid">
-      </div>
+          @for (i of skeletonSlots; track i) {
+            <div class="dexar-category-card skeleton-card">
+              <div class="dexar-category-image skeleton-image"></div>
+              <div class="dexar-category-info">
+                <div class="skeleton-line" style="height: 16px; width: 75%;"></div>
+                <div class="skeleton-line" style="height: 12px; width: 40%; margin-top: 4px;"></div>
+              </div>
+            </div>
+          }
+        </div>
+      </section>
     }
 
     @if (error()) {

src/app/pages/home/home.component.scss

@@ -896,3 +896,26 @@
     transform: translateY(-2px);
   }
 }
+
+// Skeleton loading cards
+.skeleton-card {
+  pointer-events: none;
+}
+
+.skeleton-image {
+  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.5s infinite;
+}
+
+.skeleton-line {
+  border-radius: 6px;
+  background: linear-gradient(90deg, #e8e8e8 25%, #d8d8d8 50%, #e8e8e8 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.5s infinite;
+}
+
+@keyframes shimmer {
+  0% { background-position: 200% 0; }
+  100% { background-position: -200% 0; }
+}

src/app/pages/home/home.component.ts

@@ -21,6 +21,7 @@ export class HomeComponent implements OnInit, OnDestroy {
   wideCategories = signal<Set<number>>(new Set());
   loading = signal(true);
   error = signal<string | null>(null);
+  readonly skeletonSlots = Array.from({ length: 6 });
   
   // Memoized computed values for performance
   topLevelCategories = computed(() => {

src/app/pages/search/search.component.html

@@ -56,7 +56,7 @@
   @if (items().length > 0) {
     <div class="items-grid">
       @for (item of items(); track trackByItemId($index, item)) {
-        <div class="item-card">
+        <div class="item-card" (mouseenter)="onItemHover(item.itemID)">
           <a [routerLink]="['/item', item.itemID] | langRoute" class="item-link">
             <div class="item-image">
               <img [src]="getMainImage(item)" [alt]="item.name" loading="lazy" decoding="async" width="300" height="300" />
@@ -94,19 +94,29 @@
             </div>
           </a>
           
-          <button class="add-to-cart-btn" (click)="addToCart(item.itemID, $event)">
+          <button class="add-to-cart-btn" (click)="addToCart(item.itemID, $event)" [attr.aria-label]="('search.addToCart' | translate) + ': ' + item.name">
             {{ 'search.addToCart' | translate }}
           </button>
         </div>
       }
     </div>
 
-    @if (loading() && items().length > 0) {
+      @if (loading() && items().length > 0) {
-      <div class="loading-more">
+        @for (i of skeletonSlots; track i) {
-        <div class="spinner"></div>
+          <div class="item-card skeleton-card">
-        <p>{{ 'search.loadingMore' | translate }}</p>
+            <div class="item-link">
-      </div>
+              <div class="item-image skeleton-image"></div>
-    }
+              <div class="item-details">
+                <div class="skeleton-line skeleton-title"></div>
+                <div class="skeleton-line skeleton-rating"></div>
+                <div class="skeleton-line skeleton-price"></div>
+                <div class="skeleton-line skeleton-stock"></div>
+              </div>
+            </div>
+            <div class="skeleton-btn"></div>
+          </div>
+        }
+      }
 
     @if (!hasMore() && items().length > 0) {
       <div class="no-more">

src/app/pages/search/search.component.scss

@@ -344,6 +344,59 @@
   text-align: center;
 }
 
+// Skeleton loading cards
+.skeleton-card {
+  pointer-events: none;
+
+  .skeleton-image {
+    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
+    background-size: 200% 100%;
+    animation: shimmer 1.5s infinite;
+  }
+
+  .skeleton-line {
+    border-radius: 6px;
+    background: linear-gradient(90deg, #e8e8e8 25%, #d8d8d8 50%, #e8e8e8 75%);
+    background-size: 200% 100%;
+    animation: shimmer 1.5s infinite;
+  }
+
+  .skeleton-title {
+    height: 16px;
+    width: 80%;
+  }
+
+  .skeleton-rating {
+    height: 12px;
+    width: 50%;
+  }
+
+  .skeleton-price {
+    height: 18px;
+    width: 40%;
+    margin-top: auto;
+  }
+
+  .skeleton-stock {
+    height: 6px;
+    width: 60px;
+  }
+
+  .skeleton-btn {
+    height: 42px;
+    background: linear-gradient(90deg, #5a8a85 25%, #497671 50%, #5a8a85 75%);
+    background-size: 200% 100%;
+    animation: shimmer 1.5s infinite;
+    border-radius: 0 0 13px 13px;
+    margin-top: -1px;
+  }
+}
+
+@keyframes shimmer {
+  0% { background-position: 200% 0; }
+  100% { background-position: -200% 0; }
+}
+
 @media (max-width: 768px) {
   .search-header h1 {
     font-size: 1.5rem;

src/app/pages/search/search.component.ts

@@ -3,6 +3,7 @@ import { DecimalPipe } from '@angular/common';
 import { FormsModule } from '@angular/forms';
 import { RouterLink } from '@angular/router';
 import { ApiService, CartService } from '../../services';
+import { PrefetchService } from '../../services/prefetch.service';
 import { Item } from '../../models';
 import { Subject, Subscription } from 'rxjs';
 import { debounceTime, distinctUntilChanged } from 'rxjs/operators';
@@ -10,6 +11,7 @@ import { getDiscountedPrice, getMainImage, trackByItemId } from '../../utils/ite
 import { LangRoutePipe } from '../../pipes/lang-route.pipe';
 import { TranslatePipe } from '../../i18n/translate.pipe';
 import { TranslateService } from '../../i18n/translate.service';
+import { SEARCH_DEBOUNCE_MS, ITEMS_PER_PAGE, SCROLL_THRESHOLD_PX, SCROLL_DEBOUNCE_MS } from '../../config/constants';
 
 @Component({
   selector: 'app-search',
@@ -27,7 +29,7 @@ export class SearchComponent implements OnDestroy {
   totalResults = signal<number>(0);
   
   private skip = 0;
-  private readonly count = 20;
+  private readonly count = ITEMS_PER_PAGE;
   private isLoadingMore = false;
   private searchSubject = new Subject<string>();
   private searchSubscription: Subscription;
@@ -35,11 +37,12 @@ export class SearchComponent implements OnDestroy {
 
   constructor(
     private apiService: ApiService,
-    private cartService: CartService
+    private cartService: CartService,
+    private prefetchService: PrefetchService
   ) {
     this.searchSubscription = this.searchSubject
       .pipe(
-        debounceTime(300),
+        debounceTime(SEARCH_DEBOUNCE_MS),
         distinctUntilChanged()
       )
       .subscribe(query => {
@@ -119,12 +122,12 @@ export class SearchComponent implements OnDestroy {
     
     this.scrollTimeout = setTimeout(() => {
       const scrollPosition = window.innerHeight + window.scrollY;
-      const bottomPosition = document.documentElement.scrollHeight - 500;
+      const bottomPosition = document.documentElement.scrollHeight - SCROLL_THRESHOLD_PX;
 
       if (scrollPosition >= bottomPosition && !this.loading() && this.hasMore()) {
         this.loadResults();
       }
-    }, 100);
+    }, SCROLL_DEBOUNCE_MS);
   }
 
   addToCart(itemID: number, event: Event): void {
@@ -133,6 +136,11 @@ export class SearchComponent implements OnDestroy {
     this.cartService.addItem(itemID);
   }
 
+  onItemHover(itemID: number): void {
+    this.prefetchService.prefetchItem(itemID);
+  }
+
+  readonly skeletonSlots = Array.from({ length: 8 });
   readonly getDiscountedPrice = getDiscountedPrice;
   readonly getMainImage = getMainImage;
   readonly trackByItemId = trackByItemId;

src/app/services/api.service.ts

@@ -1,7 +1,7 @@
 import { Injectable } from '@angular/core';
 import { HttpClient, HttpParams } from '@angular/common/http';
-import { Observable } from 'rxjs';
+import { Observable, timer } from 'rxjs';
-import { map } from 'rxjs/operators';
+import { map, retry } from 'rxjs/operators';
 import { Category, Item } from '../models';
 import { environment } from '../../environments/environment';
 
@@ -11,6 +11,11 @@ import { environment } from '../../environments/environment';
 export class ApiService {
   private readonly baseUrl = environment.apiUrl;
 
+  private readonly retryConfig = {
+    count: 2,
+    delay: (error: unknown, retryCount: number) => timer(Math.pow(2, retryCount) * 500)
+  };
+
   constructor(private http: HttpClient) {}
 
   private normalizeItem(item: Item): Item {
@@ -32,7 +37,7 @@ export class ApiService {
   }
 
   getCategories(): Observable<Category[]> {
-    return this.http.get<Category[]>(`${this.baseUrl}/category`);
+    return this.http.get<Category[]>(`${this.baseUrl}/category`).pipe(retry(this.retryConfig));
   }
 
   getCategoryItems(categoryID: number, count: number = 50, skip: number = 0): Observable<Item[]> {
@@ -40,12 +45,12 @@ export class ApiService {
       .set('count', count.toString())
       .set('skip', skip.toString());
     return this.http.get<Item[]>(`${this.baseUrl}/category/${categoryID}`, { params })
-      .pipe(map(items => this.normalizeItems(items)));
+      .pipe(retry(this.retryConfig), map(items => this.normalizeItems(items)));
   }
 
   getItem(itemID: number): Observable<Item> {
     return this.http.get<Item>(`${this.baseUrl}/item/${itemID}`)
-      .pipe(map(item => this.normalizeItem(item)));
+      .pipe(retry(this.retryConfig), map(item => this.normalizeItem(item)));
   }
 
   searchItems(search: string, count: number = 50, skip: number = 0): Observable<{ items: Item[], total: number }> {
@@ -55,6 +60,7 @@ export class ApiService {
       .set('skip', skip.toString());
     return this.http.get<{ items: Item[], total: number, count: number, skip: number }>(`${this.baseUrl}/searchitems`, { params })
       .pipe(
+        retry(this.retryConfig),
         map(response => ({
           items: this.normalizeItems(response?.items || []),
           total: response?.total || 0
@@ -162,6 +168,6 @@ export class ApiService {
       params = params.set('category', categoryID.toString());
     }
     return this.http.get<Item[]>(`${this.baseUrl}/randomitems`, { params })
-      .pipe(map(items => this.normalizeItems(items)));
+      .pipe(retry(this.retryConfig), map(items => this.normalizeItems(items)));
   }
 }

src/app/services/prefetch.service.ts

@@ -0,0 +1,15 @@
+import { Injectable } from '@angular/core';
+import { ApiService } from './api.service';
+
+@Injectable({ providedIn: 'root' })
+export class PrefetchService {
+  private prefetched = new Set<number>();
+
+  constructor(private api: ApiService) {}
+
+  prefetchItem(itemID: number): void {
+    if (this.prefetched.has(itemID)) return;
+    this.prefetched.add(itemID);
+    this.api.getItem(itemID).subscribe();
+  }
+}