fix(pos): rewrite catalog.js to match design system HTML structure + add cart sidebar

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pos/static/js/catalog.js

@@ -1,5 +1,6 @@
 // /home/Autopartes/pos/static/js/catalog.js
 // Catalog UI: browsable inventory with cart, barcode scanner, external lookup
+// Aligned with design-system catalog.html IDs and class names.
 
 (function () {
     'use strict';
@@ -10,99 +11,201 @@
 
     const headers = { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' };
 
+    // ─── DOM refs (design-system IDs) ───
+    const productGrid   = document.getElementById('productGrid');
+    const emptyState     = document.getElementById('emptyState');
+    const emptyTitle     = document.getElementById('emptyStateTitle');
+    const emptySubtitle  = document.getElementById('emptyStateSubtitle');
+    const searchInput    = document.getElementById('inp-part');
+    const partSearchBtn  = document.getElementById('partSearchBtn');
+    const cartSidebar    = document.getElementById('cartSidebar');
+    const cartOverlay    = document.getElementById('cartOverlay');
+    const cartItemsEl    = document.getElementById('cartItems');
+    const cartEmptyEl    = document.getElementById('cartEmpty');
+    const cartSubtotalEl = document.getElementById('cartSubtotal');
+    const cartTaxEl      = document.getElementById('cartTax');
+    const cartTotalEl    = document.getElementById('cartTotal');
+    const cartBadge      = document.getElementById('cartBadge');
+    const checkoutBtn    = document.getElementById('checkoutBtn');
+    const paginationNav  = document.querySelector('.pagination');
+
     // ─── State ───
     let currentPage = 1;
     let currentFilters = {};
     let cartItems = JSON.parse(localStorage.getItem('pos_cart') || '[]');
     let barcodeBuffer = '';
     let barcodeTimeout = null;
+    let catalogItemsMap = {};  // id -> item for cart lookup
 
     // ─── API helpers ───
     async function apiFetch(url, opts) {
-        const resp = await fetch(url, Object.assign({ headers: headers }, opts || {}));
-        if (resp.status === 401) { localStorage.removeItem('pos_token'); window.location.href = '/pos/login'; return null; }
-        return resp.json();
+        try {
+            var resp = await fetch(url, Object.assign({ headers: headers }, opts || {}));
+            if (resp.status === 401) {
+                localStorage.removeItem('pos_token');
+                window.location.href = '/pos/login';
+                return null;
+            }
+            return resp.json();
+        } catch (e) {
+            console.error('API fetch error:', e);
+            return null;
+        }
     }
 
     // ─── Catalog loading ───
     async function loadCatalog(page, filters) {
         currentPage = page || 1;
         currentFilters = filters || currentFilters;
-        const params = new URLSearchParams({ page: currentPage, per_page: 30 });
+        var params = new URLSearchParams({ page: currentPage, per_page: 30 });
         if (currentFilters.q) params.set('q', currentFilters.q);
         if (currentFilters.category) params.set('category', currentFilters.category);
         if (currentFilters.brand) params.set('brand', currentFilters.brand);
         if (currentFilters.vehicle_brand) params.set('vehicle_brand', currentFilters.vehicle_brand);
 
-        const data = await apiFetch(API + '/catalog/search?' + params.toString());
+        var data = await apiFetch(API + '/catalog/search?' + params.toString());
         if (!data) return;
 
-        renderGrid(data.data || []);
+        var items = data.data || [];
+        renderGrid(items);
         renderPagination(data.pagination || {});
-        renderActiveFilters();
+        updateResultsCount(data.pagination || {});
     }
 
     function renderGrid(items) {
-        const grid = document.getElementById('catalogGrid');
+        // Clear demo/hardcoded cards
+        productGrid.innerHTML = '';
+
         if (!items.length) {
-            grid.innerHTML = '<div class="empty-state"><p>No se encontraron productos</p><button onclick="checkExternalAvailability()" style="margin-top:12px; padding:8px 16px; cursor:pointer;">Buscar en bodegas Nexus</button></div>';
+            productGrid.style.display = 'none';
+            emptyState.classList.add('is-visible');
+            emptyTitle.textContent = 'No se encontraron productos';
+            emptySubtitle.textContent = currentFilters.q
+                ? 'No hay resultados para "' + currentFilters.q + '". Intenta con otro termino.'
+                : 'Intenta con otro termino de busqueda o verifica el numero de parte';
             return;
         }
-        grid.innerHTML = items.map(function (it) {
-            var stockClass = it.stock <= 0 ? 'stock-badge--zero' : (it.low_stock ? 'stock-badge--low' : 'stock-badge--ok');
-            var stockLabel = it.stock <= 0 ? 'Agotado' : it.stock + ' ' + (it.unit || 'PZA');
-            return '<div class="card catalog-card" onclick="window._addToCart(' + it.id + ')" data-id="' + it.id + '">' +
-                (it.image_url ? '<img src="' + it.image_url + '" alt="" style="width:100%;height:120px;object-fit:contain;margin-bottom:8px;">' : '<div style="height:120px;background:#f0f0f0;display:flex;align-items:center;justify-content:center;margin-bottom:8px;border-radius:4px;color:#aaa;">Sin imagen</div>') +
-                '<div style="font-weight:600;font-size:0.9rem;margin-bottom:4px;">' + escHtml(it.name) + '</div>' +
-                '<div style="font-size:0.8rem;color:#666;margin-bottom:4px;">' + escHtml(it.part_number) + (it.brand ? ' &middot; ' + escHtml(it.brand) : '') + '</div>' +
-                '<div style="display:flex;justify-content:space-between;align-items:center;">' +
-                '<span style="font-weight:700;font-size:1rem;">$' + fmt(it.price_1) + '</span>' +
-                '<span class="stock-badge ' + stockClass + '">' + stockLabel + '</span>' +
-                '</div></div>';
-        }).join('');
 
-        // Store items for cart lookup
-        window._catalogItems = {};
-        items.forEach(function (it) { window._catalogItems[it.id] = it; });
+        emptyState.classList.remove('is-visible');
+        productGrid.style.display = '';
+
+        catalogItemsMap = {};
+        items.forEach(function (it) { catalogItemsMap[it.id] = it; });
+
+        productGrid.innerHTML = items.map(function (it) {
+            var stockClass, stockLabel;
+            if (it.stock <= 0) {
+                stockClass = 'stock-out';
+                stockLabel = 'Agotado';
+            } else if (it.low_stock) {
+                stockClass = 'stock-low';
+                stockLabel = 'Ultimas ' + it.stock;
+            } else {
+                stockClass = 'stock-ok';
+                stockLabel = 'En stock';
+            }
+
+            var isOut = it.stock <= 0;
+            var imgHtml;
+            if (it.image_url) {
+                imgHtml = '<img src="' + escHtml(it.image_url) + '" alt="' + escHtml(it.name) + '" style="width:100%;height:100%;object-fit:contain;">';
+            } else {
+                imgHtml = '<svg width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1" aria-hidden="true"><rect x="3" y="3" width="18" height="18" rx="2"/><path d="M8 7h8M8 12h8M8 17h5"/></svg>' +
+                    '<span class="product-card__image-label" aria-hidden="true">IMG</span>';
+            }
+
+            return '<article class="product-card" role="listitem" data-id="' + it.id + '">' +
+                '<div class="product-card__image">' +
+                imgHtml +
+                '<div class="stock-badge ' + stockClass + '" role="status">' + stockLabel + '</div>' +
+                '</div>' +
+                '<div class="product-card__body">' +
+                (it.category_name ? '<div class="product-card__category">' + escHtml(it.category_name) + '</div>' : '') +
+                '<div class="product-card__name">' + escHtml(it.name) + '</div>' +
+                '<div class="product-card__oem" title="Numero de parte">' + escHtml(it.part_number || '') + '</div>' +
+                '<div class="product-card__brand">' +
+                '<span>' + escHtml(it.brand || '') + '</span>' +
+                '</div>' +
+                '</div>' +
+                '<div class="product-card__footer">' +
+                '<div class="product-card__pricing">' +
+                '<div class="product-card__price">$' + fmt(it.price_1) + '</div>' +
+                '<div class="product-card__price-unit">MXN / ' + escHtml(it.unit || 'PZA') + '</div>' +
+                '</div>' +
+                (isOut
+                    ? '<button class="btn-add" disabled style="opacity:0.45;cursor:not-allowed;" aria-label="Producto agotado">' +
+                      '<svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" aria-hidden="true"><circle cx="12" cy="12" r="10"/><path d="M4.93 4.93l14.14 14.14"/></svg> Agotado</button>'
+                    : '<button class="btn-add" onclick="CatalogApp.addToCart(' + it.id + ')" aria-label="Agregar ' + escHtml(it.name) + ' al carrito">' +
+                      '<svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" aria-hidden="true"><path d="M12 5v14M5 12h14"/></svg> Agregar</button>'
+                ) +
+                '</div>' +
+                '</article>';
+        }).join('');
     }
 
     function renderPagination(pg) {
-        var el = document.getElementById('pagination');
-        if (!pg || pg.total_pages <= 1) { el.innerHTML = ''; return; }
-        var html = '<button ' + (pg.page <= 1 ? 'disabled' : 'onclick="window._loadPage(' + (pg.page - 1) + ')"') + '>&laquo; Anterior</button>';
-        html += '<span style="padding:6px 12px; font-size:0.85rem;">' + pg.page + ' / ' + pg.total_pages + '</span>';
-        html += '<button ' + (pg.page >= pg.total_pages ? 'disabled' : 'onclick="window._loadPage(' + (pg.page + 1) + ')"') + '>Siguiente &raquo;</button>';
-        el.innerHTML = html;
+        if (!paginationNav) return;
+        if (!pg || pg.total_pages <= 1) {
+            paginationNav.innerHTML = '';
+            return;
+        }
+
+        var html = '';
+
+        // Previous button
+        if (pg.page <= 1) {
+            html += '<button class="page-item page-item--wide is-disabled" disabled aria-label="Pagina anterior">' +
+                '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="15,18 9,12 15,6"/></svg> Anterior</button>';
+        } else {
+            html += '<button class="page-item page-item--wide" onclick="CatalogApp.loadPage(' + (pg.page - 1) + ')" aria-label="Pagina anterior">' +
+                '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="15,18 9,12 15,6"/></svg> Anterior</button>';
+        }
+
+        // Page numbers
+        var pages = buildPageNumbers(pg.page, pg.total_pages);
+        pages.forEach(function (p) {
+            if (p === '...') {
+                html += '<span class="page-ellipsis" aria-hidden="true">&hellip;</span>';
+            } else if (p === pg.page) {
+                html += '<button class="page-item is-active" aria-label="Pagina ' + p + ', actual" aria-current="page">' + p + '</button>';
+            } else {
+                html += '<button class="page-item" onclick="CatalogApp.loadPage(' + p + ')" aria-label="Ir a pagina ' + p + '">' + p + '</button>';
+            }
+        });
+
+        // Next button
+        if (pg.page >= pg.total_pages) {
+            html += '<button class="page-item page-item--wide is-disabled" disabled aria-label="Pagina siguiente">Siguiente ' +
+                '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="9,18 15,12 9,6"/></svg></button>';
+        } else {
+            html += '<button class="page-item page-item--wide" onclick="CatalogApp.loadPage(' + (pg.page + 1) + ')" aria-label="Pagina siguiente">Siguiente ' +
+                '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="9,18 15,12 9,6"/></svg></button>';
+        }
+
+        paginationNav.innerHTML = html;
     }
 
-    function renderActiveFilters() {
-        var el = document.getElementById('activeFilters');
-        var chips = [];
-        if (currentFilters.category) chips.push('<span class="chip active" onclick="window._removeFilter(\'category\')">Cat: ' + currentFilters.category + ' &times;</span>');
-        if (currentFilters.brand) chips.push('<span class="chip active" onclick="window._removeFilter(\'brand\')">' + escHtml(currentFilters.brand) + ' &times;</span>');
-        if (currentFilters.vehicle_brand) chips.push('<span class="chip active" onclick="window._removeFilter(\'vehicle_brand\')">Vehiculo: ' + escHtml(currentFilters.vehicle_brand) + ' &times;</span>');
-        el.innerHTML = chips.join('');
+    function buildPageNumbers(current, total) {
+        if (total <= 7) {
+            var arr = [];
+            for (var i = 1; i <= total; i++) arr.push(i);
+            return arr;
+        }
+        var pages = [1];
+        if (current > 3) pages.push('...');
+        for (var j = Math.max(2, current - 1); j <= Math.min(total - 1, current + 1); j++) {
+            pages.push(j);
+        }
+        if (current < total - 2) pages.push('...');
+        pages.push(total);
+        return pages;
     }
 
-    // ─── Sidebar filters ───
-    async function loadCategories() {
-        var data = await apiFetch(API + '/catalog/categories');
-        if (!data) return;
-        var ul = document.getElementById('categoryList');
-        var cats = data.data || [];
-        if (!cats.length) { ul.innerHTML = '<li style="color:#999;">Sin categorias</li>'; return; }
-        ul.innerHTML = '<li onclick="window._filterCat(null)" class="' + (!currentFilters.category ? 'active' : '') + '">Todas</li>' +
-            cats.map(function (c) { return '<li onclick="window._filterCat(' + c.id + ')" class="' + (currentFilters.category == c.id ? 'active' : '') + '">Cat #' + c.id + ' <small>(' + c.count + ')</small></li>'; }).join('');
-    }
-
-    async function loadBrands() {
-        var data = await apiFetch(API + '/catalog/brands');
-        if (!data) return;
-        var ul = document.getElementById('brandList');
-        var brands = data.data || [];
-        if (!brands.length) { ul.innerHTML = '<li style="color:#999;">Sin marcas</li>'; return; }
-        ul.innerHTML = '<li onclick="window._filterBrand(null)" class="' + (!currentFilters.brand ? 'active' : '') + '">Todas</li>' +
-            brands.map(function (b) { return '<li onclick="window._filterBrand(\'' + escHtml(b.name) + '\')" class="' + (currentFilters.brand === b.name ? 'active' : '') + '">' + escHtml(b.name) + ' <small>(' + b.count + ')</small></li>'; }).join('');
+    function updateResultsCount(pg) {
+        var el = document.querySelector('.results-count');
+        if (!el || !pg) return;
+        var total = pg.total || 0;
+        el.innerHTML = '<strong>' + total.toLocaleString('es-MX') + '</strong> partes encontradas';
     }
 
     // ─── Barcode scanner ───
@@ -112,10 +215,13 @@
         addToCart(data);
     }
 
-    // Listen for rapid keypress (barcode scanners type fast, then Enter)
     document.addEventListener('keydown', function (e) {
-        if (e.key === 'F1') { e.preventDefault(); document.getElementById('searchInput').focus(); return; }
-        if (document.activeElement.tagName === 'INPUT' || document.activeElement.tagName === 'TEXTAREA') return;
+        if (e.key === 'F1') {
+            e.preventDefault();
+            if (searchInput) searchInput.focus();
+            return;
+        }
+        if (document.activeElement.tagName === 'INPUT' || document.activeElement.tagName === 'TEXTAREA' || document.activeElement.tagName === 'SELECT') return;
         if (e.key === 'Enter' && barcodeBuffer.length >= 4) {
             lookupBarcode(barcodeBuffer.trim());
             barcodeBuffer = '';
@@ -129,6 +235,11 @@
     });
 
     // ─── Cart ───
+    function addToCartById(id) {
+        var it = catalogItemsMap[id];
+        if (it) addToCart(it);
+    }
+
     function addToCart(item) {
         var existing = cartItems.find(function (c) { return c.id === item.id; });
         if (existing) {
@@ -136,12 +247,16 @@
         } else {
             cartItems.push({
                 id: item.id, part_number: item.part_number, name: item.name,
-                brand: item.brand, price: item.price_1, tax_rate: item.tax_rate || 0.16,
+                brand: item.brand, price: item.price_1 || item.price, tax_rate: item.tax_rate || 0.16,
                 unit: item.unit || 'PZA', stock: item.stock, quantity: 1
             });
         }
         saveCart();
         renderCart();
+        // Brief open to show item was added
+        if (!cartSidebar.classList.contains('open')) {
+            toggleCart();
+        }
     }
 
     function removeFromCart(index) {
@@ -169,60 +284,59 @@
     }
 
     function renderCart() {
-        var badge = document.getElementById('cartBadge');
         var total = cartItems.reduce(function (s, c) { return s + c.quantity; }, 0);
-        badge.textContent = total;
-        badge.style.display = total > 0 ? 'flex' : 'none';
-
-        var container = document.getElementById('cartItems');
-        var empty = document.getElementById('cartEmpty');
-        var checkoutBtn = document.getElementById('checkoutBtn');
+        if (cartBadge) {
+            cartBadge.textContent = total;
+            cartBadge.style.display = total > 0 ? 'flex' : 'none';
+        }
 
         if (!cartItems.length) {
-            container.innerHTML = '';
-            empty.style.display = 'block';
-            checkoutBtn.disabled = true;
-            document.getElementById('cartSubtotal').textContent = '$0.00';
-            document.getElementById('cartTax').textContent = '$0.00';
-            document.getElementById('cartTotal').textContent = '$0.00';
+            cartItemsEl.innerHTML = '';
+            cartEmptyEl.style.display = 'block';
+            if (checkoutBtn) checkoutBtn.disabled = true;
+            cartSubtotalEl.textContent = '$0.00';
+            cartTaxEl.textContent = '$0.00';
+            cartTotalEl.textContent = '$0.00';
             return;
         }
 
-        empty.style.display = 'none';
-        checkoutBtn.disabled = false;
+        cartEmptyEl.style.display = 'none';
+        if (checkoutBtn) checkoutBtn.disabled = false;
 
         var subtotal = 0;
         var tax = 0;
-        container.innerHTML = cartItems.map(function (c, i) {
+        cartItemsEl.innerHTML = cartItems.map(function (c, i) {
             var lineTotal = c.price * c.quantity;
             var lineTax = lineTotal * c.tax_rate;
             subtotal += lineTotal;
             tax += lineTax;
             return '<div class="cart-item">' +
                 '<div style="flex:1;">' +
-                '<div style="font-weight:600;font-size:0.85rem;">' + escHtml(c.name) + '</div>' +
-                '<div style="font-size:0.75rem;color:#666;">' + escHtml(c.part_number) + '</div>' +
+                '<div style="font-weight:600;font-size:0.85rem;color:var(--color-text-primary);">' + escHtml(c.name) + '</div>' +
+                '<div style="font-size:0.75rem;color:var(--color-text-muted);">' + escHtml(c.part_number) + '</div>' +
                 '<div style="margin-top:4px;display:flex;align-items:center;gap:6px;">' +
-                '<button onclick="window._updateQty(' + i + ',' + (c.quantity - 1) + ')" style="width:24px;height:24px;border:1px solid #ddd;background:#fff;border-radius:4px;cursor:pointer;">-</button>' +
-                '<span style="font-weight:600;">' + c.quantity + '</span>' +
-                '<button onclick="window._updateQty(' + i + ',' + (c.quantity + 1) + ')" style="width:24px;height:24px;border:1px solid #ddd;background:#fff;border-radius:4px;cursor:pointer;">+</button>' +
+                '<button onclick="CatalogApp.updateQty(' + i + ',' + (c.quantity - 1) + ')" style="width:24px;height:24px;border:1px solid var(--color-border);background:var(--color-bg-base);border-radius:var(--radius-sm);cursor:pointer;color:var(--color-text-primary);">-</button>' +
+                '<span style="font-weight:600;color:var(--color-text-primary);">' + c.quantity + '</span>' +
+                '<button onclick="CatalogApp.updateQty(' + i + ',' + (c.quantity + 1) + ')" style="width:24px;height:24px;border:1px solid var(--color-border);background:var(--color-bg-base);border-radius:var(--radius-sm);cursor:pointer;color:var(--color-text-primary);">+</button>' +
                 '</div></div>' +
                 '<div style="text-align:right;">' +
-                '<div style="font-weight:600;">$' + fmt(lineTotal) + '</div>' +
-                '<button onclick="window._removeFromCart(' + i + ')" style="font-size:0.75rem;color:#ef4444;background:none;border:none;cursor:pointer;margin-top:4px;">Quitar</button>' +
+                '<div style="font-weight:600;color:var(--color-text-primary);">$' + fmt(lineTotal) + '</div>' +
+                '<button onclick="CatalogApp.removeFromCart(' + i + ')" style="font-size:0.75rem;color:var(--color-error,#ef4444);background:none;border:none;cursor:pointer;margin-top:4px;">Quitar</button>' +
                 '</div></div>';
         }).join('');
 
-        document.getElementById('cartSubtotal').textContent = '$' + fmt(subtotal);
-        document.getElementById('cartTax').textContent = '$' + fmt(tax);
-        document.getElementById('cartTotal').textContent = '$' + fmt(subtotal + tax);
+        cartSubtotalEl.textContent = '$' + fmt(subtotal);
+        cartTaxEl.textContent = '$' + fmt(tax);
+        cartTotalEl.textContent = '$' + fmt(subtotal + tax);
     }
 
     function toggleCart() {
-        document.getElementById('cartSidebar').classList.toggle('open');
+        var isOpen = cartSidebar.classList.toggle('open');
+        if (cartOverlay) cartOverlay.classList.toggle('open', isOpen);
     }
 
     function goToCheckout() {
+        if (!cartItems.length) return;
         localStorage.setItem('pos_cart', JSON.stringify(cartItems));
         window.location.href = '/pos/sale';
     }
@@ -231,19 +345,17 @@
     async function checkExternalAvailability(partNumber) {
         var pn = partNumber || currentFilters.q || '';
         if (!pn) return;
-        var section = document.getElementById('externalSection');
-        var results = document.getElementById('externalResults');
-        section.style.display = 'block';
-        results.innerHTML = '<p>Buscando en bodegas...</p>';
+        alert('Buscando "' + pn + '" en bodegas Nexus...');
 
         var data = await apiFetch(API + '/catalog/external-availability/' + encodeURIComponent(pn));
         if (!data || !data.data || !data.data.length) {
-            results.innerHTML = '<p>No se encontraron resultados externos para "' + escHtml(pn) + '"</p>';
+            alert('No se encontraron resultados externos para "' + pn + '"');
             return;
         }
-        results.innerHTML = '<ul>' + data.data.map(function (r) {
-            return '<li><strong>' + escHtml(r.name || r.part_number || pn) + '</strong> — Stock: ' + (r.stock || 'N/A') + '</li>';
-        }).join('') + '</ul>';
+        var msg = data.data.map(function (r) {
+            return (r.name || r.part_number || pn) + ' - Stock: ' + (r.stock || 'N/A');
+        }).join('\n');
+        alert('Resultados externos:\n' + msg);
     }
 
     // ─── Helpers ───
@@ -251,43 +363,73 @@
     function escHtml(s) { if (!s) return ''; var d = document.createElement('div'); d.textContent = s; return d.innerHTML; }
 
     // ─── Search input ───
-    var searchInput = document.getElementById('searchInput');
     var searchTimeout = null;
-    searchInput.addEventListener('input', function () {
-        clearTimeout(searchTimeout);
-        searchTimeout = setTimeout(function () {
-            currentFilters.q = searchInput.value.trim();
-            loadCatalog(1, currentFilters);
-        }, 350);
-    });
-    searchInput.addEventListener('keydown', function (e) {
-        if (e.key === 'Enter') {
-            e.preventDefault();
+    if (searchInput) {
+        searchInput.addEventListener('input', function () {
             clearTimeout(searchTimeout);
-            currentFilters.q = searchInput.value.trim();
+            searchTimeout = setTimeout(function () {
+                currentFilters.q = searchInput.value.trim();
+                loadCatalog(1, currentFilters);
+            }, 300);
+        });
+        searchInput.addEventListener('keydown', function (e) {
+            if (e.key === 'Enter') {
+                e.preventDefault();
+                clearTimeout(searchTimeout);
+                currentFilters.q = searchInput.value.trim();
+                loadCatalog(1, currentFilters);
+            }
+        });
+    }
+
+    // ─── Part search button ───
+    if (partSearchBtn) {
+        partSearchBtn.addEventListener('click', function () {
+            if (searchInput) {
+                currentFilters.q = searchInput.value.trim();
+                loadCatalog(1, currentFilters);
+            }
+        });
+    }
+
+    // ─── Filter chips ───
+    document.querySelectorAll('[data-chip]').forEach(function (chip) {
+        chip.addEventListener('click', function () {
+            var isActive = chip.classList.contains('is-active');
+            // Deactivate all chips first for single-select behavior
+            document.querySelectorAll('[data-chip]').forEach(function (c) {
+                c.classList.remove('is-active');
+                c.setAttribute('aria-pressed', 'false');
+            });
+            if (!isActive) {
+                chip.classList.add('is-active');
+                chip.setAttribute('aria-pressed', 'true');
+                currentFilters.category = chip.dataset.chip;
+            } else {
+                delete currentFilters.category;
+            }
             loadCatalog(1, currentFilters);
-        }
+        });
     });
 
-    // ─── Expose globals for inline handlers ───
-    window._addToCart = function (id) {
-        var it = window._catalogItems && window._catalogItems[id];
-        if (it) addToCart(it);
+    // ─── Expose globals for inline onclick handlers ───
+    window.CatalogApp = {
+        toggleCart: toggleCart,
+        goToCheckout: goToCheckout,
+        addToCart: addToCartById,
+        removeFromCart: removeFromCart,
+        updateQty: updateQuantity,
+        clearCart: clearCartFn,
+        loadPage: function (p) { loadCatalog(p); },
+        checkExternal: checkExternalAvailability
     };
-    window._loadPage = function (p) { loadCatalog(p); };
-    window._removeFilter = function (key) { delete currentFilters[key]; loadCatalog(1); loadCategories(); loadBrands(); };
-    window._filterCat = function (id) { if (id) currentFilters.category = id; else delete currentFilters.category; loadCatalog(1); loadCategories(); };
-    window._filterBrand = function (name) { if (name) currentFilters.brand = name; else delete currentFilters.brand; loadCatalog(1); loadBrands(); };
-    window._removeFromCart = removeFromCart;
-    window._updateQty = updateQuantity;
+
+    // Also keep legacy window._ handlers for backward compat
     window.toggleCart = toggleCart;
     window.goToCheckout = goToCheckout;
-    window.clearCart = clearCartFn;
     window.checkExternalAvailability = checkExternalAvailability;
 
     // ─── Init ───
     renderCart();
     loadCatalog(1, {});
-    loadCategories();
-    loadBrands();
 })();