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    <style>
        /* ============================================================
                   ВЕСЬ CSS (полный, как был)
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        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary: #1a56db;
            --primary-light: #3b82f6;
            --primary-dark: #1e3a8a;
            --accent: #60a5fa;
            --bg: #0f172a;
            --bg-card: #1e293b;
            --text: #f1f5f9;
            --text-secondary: #94a3b8;
            --border: #334155;
            --radius: 16px;
            --radius-sm: 8px;
            --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
            --transition: 0.3s ease;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: 'Inter', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            overflow-x: hidden;
            min-height: 100vh;
        }

        /* ВСЕ ИКОНКИ ЧЁРНО-БЕЛЫЕ */
        i,
        .icon,
        .fa,
        .fas,
        .far,
        .fab,
        .fa-solid,
        .fa-regular,
        .fa-brands,
        .svg-inline--fa {
            color: #ffffff !important;
            filter: grayscale(100%) brightness(1.2) !important;
        }

        .product-favorite.active i,
        .product-favorite.active .fa,
        .product-favorite.active .fas {
            color: #ef4444 !important;
            filter: none !important;
        }

        .category-card .icon {
            font-size: 32px;
            margin-bottom: 8px;
            filter: grayscale(100%) brightness(1.2) !important;
        }

        .stars {
            color: #fbbf24 !important;
            filter: none !important;
        }

        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--primary-light);
            border-radius: 10px;
            filter: grayscale(100%);
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }

        @keyframes float {
            0%,
            100% { transform: translateY(0); }
            50% { transform: translateY(-10px); }
        }
        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        @keyframes gradient-shift {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }

        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 16px;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
            background: var(--bg-card);
            color: var(--text);
            border: 1px solid var(--border);
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: white;
            border: none;
            box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
        }
        .btn-primary:hover {
            transform: scale(1.04);
            box-shadow: 0 6px 30px rgba(59, 130, 246, 0.5);
        }
        .btn-secondary {
            background: transparent;
            color: white;
            border: 2px solid var(--primary-light);
        }
        .btn-secondary:hover {
            background: rgba(59, 130, 246, 0.12);
            transform: scale(1.04);
        }
        .btn-danger {
            background: #dc2626;
            color: white;
            border: none;
        }
        .btn-danger:hover {
            background: #b91c1c;
            transform: scale(1.04);
        }
        .btn-success {
            background: #22c55e;
            color: white;
            border: none;
        }
        .btn-success:hover {
            background: #16a34a;
            transform: scale(1.04);
        }
        .btn-sm {
            padding: 8px 16px;
            font-size: 13px;
        }
        .btn-block {
            width: 100%;
            justify-content: center;
        }

        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 14px 0;
            transition: all var(--transition);
            background: transparent;
        }
        .navbar.scrolled {
            background: rgba(15, 23, 42, 0.92);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            padding: 10px 0;
        }
        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 28px;
            font-weight: 900;
            color: white;
            text-decoration: none;
        }
        .logo img {
            height: 70px;
            width: auto;
            object-fit: contain;
            border-radius: 12px;
            background: rgba(255, 255, 255, 0.05);
            padding: 4px;
        }
        .logo span {
            background: linear-gradient(135deg, #fff, var(--primary-light), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            font-size: 32px;
            font-weight: 900;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            flex-wrap: wrap;
        }
        .nav-links a {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 600;
            font-size: 15px;
            transition: color var(--transition);
            cursor: pointer;
        }
        .nav-links a:hover {
            color: white;
        }

        .nav-icons {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .nav-icons .icon-btn {
            background: none;
            border: none;
            color: var(--text-secondary);
            font-size: 20px;
            cursor: pointer;
            transition: color var(--transition);
            position: relative;
            padding: 4px;
        }
        .nav-icons .icon-btn:hover {
            color: white;
        }
        .nav-icons .icon-btn .badge {
            position: absolute;
            top: -4px;
            right: -4px;
            background: var(--primary-light);
            color: white;
            font-size: 10px;
            font-weight: 700;
            min-width: 18px;
            height: 18px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0 4px;
        }
        .nav-icons .icon-btn .badge.hidden {
            display: none;
        }

        .user-avatar {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: white;
            font-size: 14px;
            cursor: pointer;
            border: 2px solid transparent;
            transition: border var(--transition);
            object-fit: cover;
        }
        .user-avatar:hover {
            border-color: white;
        }

        .burger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 4px;
        }
        .burger span {
            display: block;
            width: 28px;
            height: 3px;
            background: white;
            transition: all var(--transition);
            border-radius: 2px;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            right: -100%;
            width: 80%;
            max-width: 340px;
            height: 100vh;
            background: var(--bg-card);
            border-left: 1px solid var(--border);
            padding: 80px 24px 32px;
            transition: right 0.3s ease;
            z-index: 999;
            overflow-y: auto;
        }
        .mobile-menu.open {
            right: 0;
        }
        .mobile-menu a {
            display: block;
            color: var(--text);
            text-decoration: none;
            padding: 16px 0;
            font-size: 18px;
            border-bottom: 1px solid var(--border);
            transition: color var(--transition);
            cursor: pointer;
        }
        .mobile-menu a:hover {
            color: var(--primary-light);
        }
        .mobile-menu .close-btn {
            position: absolute;
            top: 20px;
            right: 20px;
            background: none;
            border: none;
            color: white;
            font-size: 32px;
            cursor: pointer;
        }

        .menu-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 998;
        }
        .menu-overlay.active {
            display: block;
        }

        .auth-modal {
            display: none;
            position: fixed;
            inset: 0;
            z-index: 2000;
            align-items: center;
            justify-content: center;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(8px);
        }
        .auth-modal.active {
            display: flex;
        }
        .auth-modal .auth-box {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 40px 32px;
            max-width: 420px;
            width: 100%;
            max-height: 90vh;
            overflow-y: auto;
            position: relative;
        }
        .auth-modal .auth-box h2 {
            font-size: 24px;
            margin-bottom: 8px;
        }
        .auth-modal .auth-box p {
            color: var(--text-secondary);
            font-size: 14px;
            margin-bottom: 24px;
        }
        .auth-modal .auth-box .close-auth {
            position: absolute;
            top: 16px;
            right: 20px;
            background: none;
            border: none;
            color: var(--text-secondary);
            font-size: 24px;
            cursor: pointer;
        }
        .auth-modal .auth-box .close-auth:hover {
            color: white;
        }
        .auth-modal .auth-box .form-group {
            margin-bottom: 16px;
        }
        .auth-modal .auth-box .form-group label {
            display: block;
            font-weight: 500;
            font-size: 14px;
            margin-bottom: 4px;
        }
        .auth-modal .auth-box .form-group input {
            width: 100%;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            background: var(--bg);
            color: white;
            font-size: 15px;
            transition: border var(--transition);
        }
        .auth-modal .auth-box .form-group input:focus {
            outline: none;
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
        }
        .auth-modal .auth-box .auth-toggle {
            text-align: center;
            margin-top: 16px;
            font-size: 14px;
            color: var(--text-secondary);
        }
        .auth-modal .auth-box .auth-toggle span {
            color: var(--primary-light);
            cursor: pointer;
            font-weight: 600;
        }
        .auth-modal .auth-box .auth-toggle span:hover {
            text-decoration: underline;
        }
        .auth-modal .auth-box .error-msg {
            color: #ef4444;
            font-size: 14px;
            margin-top: 8px;
            display: none;
        }
        .auth-modal .auth-box .error-msg.show {
            display: block;
        }

        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            padding: 120px 0 80px;
            background: linear-gradient(135deg, #0f172a 0%, #1a2a4a 50%, #0f172a 100%);
        }
        .hero::before {
            content: '';
            position: absolute;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.15), transparent 70%);
            top: -200px;
            right: -200px;
            border-radius: 50%;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-text h1 {
            font-size: clamp(36px, 5vw, 60px);
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #fff, var(--primary-light), var(--accent));
            background-size: 200% 200%;
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            animation: gradient-shift 4s ease infinite;
        }
        .hero-text p {
            font-size: clamp(16px, 1.2vw, 20px);
            color: var(--text-secondary);
            margin-bottom: 32px;
            max-width: 480px;
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-bottom: 32px;
            flex-wrap: wrap;
        }
        .hero-stats .stat {
            text-align: center;
        }
        .hero-stats .stat-value {
            font-size: clamp(28px, 2.5vw, 38px);
            font-weight: 700;
            color: var(--primary-light);
        }
        .hero-stats .stat-label {
            font-size: 13px;
            color: var(--text-secondary);
        }
        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
        .hero-image {
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .hero-image img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
            animation: float 6s ease-in-out infinite;
        }

        .section {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: clamp(28px, 3vw, 40px);
            font-weight: 700;
            background: linear-gradient(135deg, #fff, var(--primary-light));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .section-header p {
            color: var(--text-secondary);
            font-size: 18px;
            margin-top: 8px;
        }

        .categories-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 16px;
        }
        .category-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px 16px;
            text-align: center;
            transition: all var(--transition);
            cursor: pointer;
            text-decoration: none;
            color: var(--text);
        }
        .category-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary-light);
            box-shadow: 0 8px 30px rgba(59, 130, 246, 0.12);
        }

        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .product-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition);
            position: relative;
        }
        .product-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary-light);
            box-shadow: 0 8px 30px rgba(59, 130, 246, 0.12);
        }
        .product-card .product-img {
            width: 100%;
            height: 240px;
            object-fit: cover;
            background: #1a1a2e;
            display: block;
        }
        .product-card .product-favorite {
            position: absolute;
            top: 12px;
            right: 12px;
            background: rgba(0, 0, 0, 0.5);
            border: none;
            color: white;
            font-size: 20px;
            padding: 8px;
            border-radius: 50%;
            cursor: pointer;
            transition: all var(--transition);
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .product-card .product-favorite:hover {
            background: rgba(0, 0, 0, 0.8);
            transform: scale(1.1);
        }
        .product-card .product-favorite.active {
            color: #ef4444 !important;
        }
        .product-card .product-favorite.active i {
            color: #ef4444 !important;
            filter: none !important;
        }
        .product-card .info {
            padding: 20px;
        }
        .product-card .info h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .product-card .info .category-tag {
            font-size: 12px;
            color: var(--primary-light);
            background: rgba(59, 130, 246, 0.12);
            padding: 2px 12px;
            border-radius: 20px;
            display: inline-block;
            margin-bottom: 8px;
        }
        .product-card .info .desc {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .product-card .info .price {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary-light);
        }
        .product-card .info .actions {
            display: flex;
            gap: 8px;
            margin-top: 16px;
            flex-wrap: wrap;
        }
        .product-card .info .actions .btn {
            flex: 1;
            justify-content: center;
            padding: 10px 16px;
            font-size: 13px;
            min-width: 80px;
        }

        .reviews-section {
            margin-top: 16px;
            border-top: 1px solid var(--border);
            padding-top: 12px;
        }
        .reviews-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 8px;
            font-size: 14px;
            color: var(--text-secondary);
        }
        .reviews-rating {
            color: #fbbf24 !important;
            filter: none !important;
        }
        .reviews-list {
            max-height: 200px;
            overflow-y: auto;
        }
        .review-item {
            background: var(--bg);
            border-radius: var(--radius-sm);
            padding: 12px;
            margin-bottom: 8px;
            border: 1px solid var(--border);
        }
        .review-item .review-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 4px;
            flex-wrap: wrap;
        }
        .review-item .review-author {
            font-weight: 600;
            color: var(--primary-light);
            font-size: 13px;
        }
        .review-item .review-date {
            font-size: 11px;
            color: var(--text-secondary);
        }
        .review-item .review-text {
            color: var(--text-secondary);
            font-size: 14px;
            margin-top: 4px;
        }

        .profile-section {
            padding: 120px 0 80px;
        }
        .profile-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px;
            max-width: 800px;
            margin: 0 auto;
        }
        .profile-card .avatar-large {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            font-weight: 700;
            color: white;
            margin-bottom: 16px;
        }
        .profile-card .profile-name {
            font-size: 28px;
            font-weight: 700;
        }
        .profile-card .profile-email {
            color: var(--text-secondary);
        }
        .profile-card .profile-role {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            margin-top: 8px;
        }
        .profile-card .profile-role.admin {
            background: rgba(59, 130, 246, 0.2);
            color: var(--primary-light);
        }
        .profile-card .profile-role.user {
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-secondary);
        }
        .profile-card .profile-stats {
            display: flex;
            gap: 32px;
            margin: 20px 0;
            flex-wrap: wrap;
        }
        .profile-card .profile-stats .stat {
            text-align: center;
        }
        .profile-card .profile-stats .stat-value {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary-light);
        }
        .profile-card .profile-stats .stat-label {
            font-size: 13px;
            color: var(--text-secondary);
        }
        .profile-orders {
            margin-top: 24px;
            border-top: 1px solid var(--border);
            padding-top: 24px;
        }
        .profile-orders h4 {
            font-size: 18px;
            margin-bottom: 16px;
        }
        .order-item {
            background: var(--bg);
            border-radius: var(--radius-sm);
            padding: 16px;
            margin-bottom: 12px;
            border: 1px solid var(--border);
        }
        .order-item .order-header {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            margin-bottom: 8px;
        }
        .order-item .order-id {
            font-weight: 600;
            color: var(--primary-light);
        }
        .order-item .order-status {
            font-size: 12px;
            padding: 2px 12px;
            border-radius: 20px;
            background: rgba(34, 197, 94, 0.15);
            color: #22c55e;
        }
        .order-item .order-status.completed {
            background: rgba(34, 197, 94, 0.15);
            color: #22c55e;
        }
        .order-item .order-status.new {
            background: rgba(59, 130, 246, 0.15);
            color: var(--primary-light);
        }
        .order-item .order-items {
            font-size: 14px;
            color: var(--text-secondary);
        }
        .order-item .order-total {
            font-weight: 700;
            color: var(--primary-light);
            margin-top: 4px;
        }
        .order-item .order-date {
            font-size: 12px;
            color: var(--text-secondary);
        }

        .admin-panel {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px;
            margin-bottom: 40px;
        }
        .admin-panel h3 {
            font-size: 22px;
            margin-bottom: 20px;
        }
        .admin-panel .form-group {
            margin-bottom: 16px;
        }
        .admin-panel .form-group label {
            display: block;
            font-weight: 500;
            font-size: 14px;
            margin-bottom: 4px;
        }
        .admin-panel .form-group input,
        .admin-panel .form-group textarea,
        .admin-panel .form-group select {
            width: 100%;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            background: var(--bg);
            color: white;
            font-size: 15px;
            transition: border var(--transition);
        }
        .admin-panel .form-group input:focus,
        .admin-panel .form-group textarea:focus,
        .admin-panel .form-group select:focus {
            outline: none;
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
        }
        .admin-panel .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }
        .admin-panel .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .admin-panel .file-upload {
            display: flex;
            gap: 12px;
            align-items: center;
            flex-wrap: wrap;
        }
        .admin-panel .file-upload input[type="file"] {
            display: none;
        }
        .admin-panel .file-upload .file-name {
            color: var(--text-secondary);
            font-size: 14px;
            word-break: break-all;
        }
        .admin-panel .file-upload .upload-preview {
            max-width: 100px;
            max-height: 100px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            display: none;
        }
        .admin-panel .file-upload .upload-preview.show {
            display: block;
        }

        .cart-sidebar {
            position: fixed;
            top: 0;
            right: -440px;
            width: 400px;
            max-width: 90vw;
            height: 100vh;
            background: var(--bg-card);
            border-left: 1px solid var(--border);
            padding: 24px;
            transition: right 0.35s ease;
            z-index: 1100;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
        }
        .cart-sidebar.open {
            right: 0;
        }
        .cart-sidebar .cart-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            padding-bottom: 16px;
            border-bottom: 1px solid var(--border);
        }
        .cart-sidebar .cart-header h3 {
            font-size: 22px;
        }
        .cart-sidebar .cart-header .close {
            background: none;
            border: none;
            color: white;
            font-size: 28px;
            cursor: pointer;
        }
        .cart-item {
            display: flex;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border);
            align-items: center;
        }
        .cart-item img {
            width: 60px;
            height: 60px;
            object-fit: cover;
            border-radius: var(--radius-sm);
            background: #1a1a2e;
        }
        .cart-item .details {
            flex: 1;
        }
        .cart-item .details .name {
            font-weight: 500;
            font-size: 15px;
        }
        .cart-item .details .price {
            color: var(--primary-light);
            font-weight: 600;
        }
        .cart-item .qty-control {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .cart-item .qty-control button {
            background: var(--bg);
            border: 1px solid var(--border);
            color: white;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            cursor: pointer;
            font-size: 14px;
            transition: all var(--transition);
        }
        .cart-item .qty-control button:hover {
            background: var(--primary-light);
        }
        .cart-item .qty-control span {
            min-width: 24px;
            text-align: center;
        }
        .cart-item .remove {
            background: none;
            border: none;
            color: var(--text-secondary);
            cursor: pointer;
            font-size: 18px;
        }
        .cart-item .remove:hover {
            color: #ef4444;
        }
        .cart-total {
            margin-top: auto;
            padding-top: 20px;
            border-top: 1px solid var(--border);
            display: flex;
            justify-content: space-between;
            font-size: 20px;
            font-weight: 700;
        }
        .cart-total .total-price {
            color: var(--primary-light);
        }
        .cart-actions {
            display: flex;
            gap: 12px;
            margin-top: 16px;
        }
        .cart-actions .btn {
            flex: 1;
            justify-content: center;
        }
        .cart-empty {
            text-align: center;
            padding: 40px 0;
            color: var(--text-secondary);
        }
        .cart-empty i {
            font-size: 48px;
            margin-bottom: 16px;
            display: block;
        }

        .cart-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1099;
        }
        .cart-overlay.active {
            display: block;
        }

        .search-bar {
            display: flex;
            gap: 12px;
            margin-bottom: 32px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
            flex-wrap: wrap;
        }
        .search-bar input {
            flex: 1;
            padding: 12px 20px;
            border-radius: 50px;
            border: 1px solid var(--border);
            background: var(--bg-card);
            color: white;
            font-size: 16px;
            transition: border var(--transition);
            min-width: 200px;
        }
        .search-bar input:focus {
            outline: none;
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
        }

        .footer {
            background: #0a0f1a;
            padding: 60px 0 30px;
            border-top: 1px solid var(--border);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
            color: white;
        }
        .footer p,
        .footer a {
            color: var(--text-secondary);
            font-size: 14px;
            text-decoration: none;
            line-height: 2;
            display: block;
        }
        .footer a:hover {
            color: var(--primary-light);
        }
        .footer .social {
            display: flex;
            gap: 12px;
            margin-top: 12px;
            flex-wrap: wrap;
        }
        .footer .social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--bg-card);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            transition: all var(--transition);
            font-size: 18px;
        }
        .footer .social a:hover {
            background: var(--primary);
            color: white;
            transform: translateY(-3px);
        }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 24px;
            text-align: center;
            font-size: 14px;
            color: var(--text-secondary);
        }

        @media (max-width: 1024px) {
            .hero-content {
                grid-template-columns: 1fr;
                text-align: center;
                gap: 40px;
            }
            .hero-text p {
                margin-left: auto;
                margin-right: auto;
            }
            .hero-stats {
                justify-content: center;
            }
            .hero-buttons {
                justify-content: center;
            }
            .hero-image img {
                max-height: 400px;
            }
            .nav-links {
                gap: 20px;
            }
        }

        @media (max-width: 768px) {
            .burger {
                display: flex;
            }
            .nav-links {
                display: none;
            }
            .mobile-menu {
                display: block;
            }

            .logo img {
                height: 50px;
            }
            .logo span {
                font-size: 22px;
            }

            .hero {
                padding: 100px 0 60px;
            }
            .hero-text h1 {
                font-size: 32px;
            }
            .hero-stats {
                gap: 20px;
            }
            .hero-stats .stat-value {
                font-size: 24px;
            }

            .categories-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .category-card {
                padding: 16px 12px;
            }

            .products-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .product-card .product-img {
                height: 160px;
            }
            .product-card .info {
                padding: 14px;
            }
            .product-card .info h3 {
                font-size: 15px;
            }
            .product-card .info .price {
                font-size: 18px;
            }
            .product-card .info .actions .btn {
                font-size: 12px;
                padding: 6px 10px;
                min-width: 60px;
            }

            .section {
                padding: 50px 0;
            }
            .section-header h2 {
                font-size: 28px;
            }

            .admin-panel .form-row {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }

            .cart-sidebar {
                width: 100%;
                max-width: 100%;
                right: -100%;
            }
            .cart-sidebar.open {
                right: 0;
            }

            .search-bar {
                flex-direction: column;
            }
            .search-bar .btn {
                width: 100%;
            }

            .profile-card {
                padding: 20px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 12px;
            }
            .logo {
                font-size: 16px;
                gap: 8px;
            }
            .logo span {
                font-size: 18px;
            }
            .logo img {
                height: 40px;
            }

            .hero-text h1 {
                font-size: 24px;
            }
            .hero-text p {
                font-size: 14px;
            }
            .hero-stats .stat-value {
                font-size: 20px;
            }

            .products-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .product-card .product-img {
                height: 120px;
            }
            .product-card .info h3 {
                font-size: 13px;
            }
            .product-card .info .price {
                font-size: 16px;
            }
            .product-card .info .actions .btn {
                font-size: 10px;
                padding: 4px 8px;
                min-width: 50px;
            }

            .btn {
                font-size: 13px;
                padding: 10px 18px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .footer .social {
                justify-content: center;
            }

            .admin-panel {
                padding: 16px;
            }
            .admin-panel .form-row {
                grid-template-columns: 1fr;
            }

            .profile-card .profile-stats {
                gap: 16px;
            }
        }

        @media (min-width: 1440px) {
            .products-grid {
                grid-template-columns: repeat(5, 1fr);
            }
            .categories-grid {
                grid-template-columns: repeat(5, 1fr);
            }
            .product-card .product-img {
                height: 260px;
            }
        }

        .hidden {
            display: none !important;
        }
        .text-center {
            text-align: center;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .flex {
            display: flex;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .items-center {
            align-items: center;
        }
        .justify-between {
            justify-content: space-between;
        }
        .flex-1 {
            flex: 1;
        }
        .w-full {
            width: 100%;
        }
    </style>
</head>
<body>

    <!-- ============================================================
    НАВБАР
    ============================================================ -->
    <nav class="navbar" id="navbar">
        <div class="container">
            <a href="#" class="logo">
                <img src="photo/logo.png" alt="Фанерочка" onerror="this.style.display='none'" />
                <span>Фанерочка</span>
            </a>

            <ul class="nav-links" id="navLinks">
                <li><a onclick="showCatalog()">Каталог</a></li>
                <li><a onclick="showFavorites()">Избранное</a></li>
                <li><a onclick="showProfile()">Профиль</a></li>
                <li><a onclick="showAdmin()" id="adminLink" class="hidden">Админ</a></li>
                <li><a onclick="showDelivery()">Доставка</a></li>
                <li><a onclick="showContacts()">Контакты</a></li>
            </ul>

            <div class="nav-icons">
                <button class="icon-btn" onclick="toggleSearch()" title="Поиск">
                    <i class="fas fa-search"></i>
                </button>
                <button class="icon-btn" onclick="toggleCart()" title="Корзина">
                    <i class="fas fa-shopping-cart"></i>
                    <span class="badge" id="cartBadge">0</span>
                </button>
                <button class="icon-btn" onclick="toggleAuth()" title="Войти" id="authBtn">
                    <i class="fas fa-user"></i>
                </button>
                <div class="user-avatar hidden" id="userAvatar" onclick="toggleAuth()" title="Профиль">
                    <span id="avatarLetter">?</span>
                </div>
                <button class="burger" id="burgerBtn" aria-label="Меню">
                    <span></span><span></span><span></span>
                </button>
            </div>
        </div>
    </nav>

    <!-- ============================================================
    МОБИЛЬНОЕ МЕНЮ
    ============================================================ -->
    <div class="menu-overlay" id="menuOverlay"></div>
    <div class="mobile-menu" id="mobileMenu">
        <button class="close-btn" id="closeMenuBtn">&times;</button>
        <a onclick="showCatalog(); closeMobileMenu();">Каталог</a>
        <a onclick="showFavorites(); closeMobileMenu();">Избранное</a>
        <a onclick="showProfile(); closeMobileMenu();">Профиль</a>
        <a onclick="showAdmin(); closeMobileMenu();" id="mobileAdminLink" class="hidden">Админ</a>
        <a onclick="showDelivery(); closeMobileMenu();">Доставка</a>
        <a onclick="showContacts(); closeMobileMenu();">Контакты</a>
        <a onclick="toggleAuth(); closeMobileMenu();" id="mobileAuthBtn">Войти</a>
        <a onclick="logoutUser(); closeMobileMenu();" id="mobileLogoutBtn" class="hidden">Выйти</a>
    </div>

    <!-- ============================================================
    АВТОРИЗАЦИЯ
    ============================================================ -->
    <div class="auth-modal" id="authModal">
        <div class="auth-box">
            <button class="close-auth" onclick="closeAuth()">&times;</button>
            <h2 id="authTitle">Вход</h2>
            <p id="authSubtitle">Войдите в свой аккаунт</p>
            <div class="error-msg" id="authError"></div>
            <div class="form-group">
                <label>Email</label>
                <input type="email" id="authEmail" placeholder="your@email.ru" />
            </div>
            <div class="form-group">
                <label>Пароль</label>
                <input type="password" id="authPassword" placeholder="••••••••" />
            </div>
            <div class="form-group hidden" id="authNameGroup">
                <label>Имя</label>
                <input type="text" id="authName" placeholder="Ваше имя" />
            </div>
            <button class="btn btn-primary btn-block" id="authSubmitBtn">Войти</button>
            <div class="auth-toggle">
                <span id="authToggleText">Нет аккаунта? <span id="authToggleLink">Зарегистрироваться</span></span>
            </div>
        </div>
    </div>

    <!-- ============================================================
    КОРЗИНА
    ============================================================ -->
    <div class="cart-overlay" id="cartOverlay"></div>
    <div class="cart-sidebar" id="cartSidebar">
        <div class="cart-header">
            <h3>Корзина</h3>
            <button class="close" onclick="toggleCart()">&times;</button>
        </div>
        <div id="cartItems">
            <div class="cart-empty">
                <i class="fas fa-shopping-basket"></i>
                <p>Корзина пуста</p>
            </div>
        </div>
        <div class="cart-total hidden" id="cartTotalBlock">
            <span>Итого:</span>
            <span class="total-price" id="cartTotalPrice">0 ₽</span>
        </div>
        <div class="cart-actions hidden" id="cartActions">
            <button class="btn btn-secondary" onclick="clearCart()">Очистить</button>
            <button class="btn btn-primary" onclick="checkout()">Оформить заказ</button>
        </div>
    </div>

    <!-- ============================================================
    HERO
    ============================================================ -->
    <section class="hero" id="home">
        <div class="container">
            <div class="hero-content">
                <div class="hero-text fade-up">
                    <h1>Изделия из фанеры с душой</h1>
                    <p>Ручная работа, экологичные материалы, уникальный дизайн. Доставка по Санкт-Петербургу и всей России.</p>
                    <div class="hero-stats">
                        <div class="stat">
                            <div class="stat-value" id="productsCount">0</div>
                            <div class="stat-label">Товаров</div>
                        </div>
                        <div class="stat">
                            <div class="stat-value">100%</div>
                            <div class="stat-label">Натуральное дерево</div>
                        </div>
                        <div class="stat">
                            <div class="stat-value">🚚</div>
                            <div class="stat-label">Доставка по РФ</div>
                        </div>
                    </div>
                    <div class="hero-buttons">
                        <button class="btn btn-primary" onclick="showCatalog()">Смотреть каталог</button>
                        <button class="btn btn-secondary" onclick="showContacts()">Связаться</button>
                    </div>
                </div>
                <div class="hero-image fade-up">
                    <img src="photo/hero.jpg" alt="Изделия из фанеры" onerror="this.src='https://via.placeholder.com/600x400/1a2a4a/3b82f6?text=Фанерочка'" />
                </div>
            </div>
        </div>
    </section>

    <!-- ============================================================
    ПОИСК
    ============================================================ -->
    <div class="section" id="searchSection" style="display:none; padding-top: 20px;">
        <div class="container">
            <div class="search-bar">
                <input type="text" id="searchInput" placeholder="Поиск по названию..." oninput="searchProducts()" />
                <button class="btn btn-primary" onclick="searchProducts()">Найти</button>
                <button class="btn btn-secondary" onclick="clearSearch()">Сбросить</button>
            </div>
            <div id="searchResults" class="products-grid"></div>
        </div>
    </div>

    <!-- ============================================================
    КАТАЛОГ
    ============================================================ -->
    <section class="section" id="catalogSection">
        <div class="container">
            <div class="section-header fade-up">
                <h2>Наши изделия</h2>
                <p>Каждое изделие сделано с любовью и вниманием к деталям</p>
            </div>
            <div class="categories-grid fade-up" id="categoriesGrid">
                <div class="category-card" onclick="filterByCategory('Все')">
                    <div class="icon">📦</div>
                    <div class="name">Все</div>
                </div>
                <div class="category-card" onclick="filterByCategory('Настенные часы')">
                    <div class="icon">🕐</div>
                    <div class="name">Настенные часы</div>
                </div>
                <div class="category-card" onclick="filterByCategory('Шкатулки')">
                    <div class="icon">📦</div>
                    <div class="name">Шкатулки</div>
                </div>
                <div class="category-card" onclick="filterByCategory('Хлебницы')">
                    <div class="icon">🍞</div>
                    <div class="name">Хлебницы</div>
                </div>
                <div class="category-card" onclick="filterByCategory('Подарки')">
                    <div class="icon">🎁</div>
                    <div class="name">Подарки</div>
                </div>
            </div>
            <div class="products-grid fade-up" id="productsGrid"></div>
        </div>
    </section>

    <!-- ============================================================
    ПРОФИЛЬ
    ============================================================ -->
    <section class="profile-section" id="profileSection" style="display:none;">
        <div class="container">
            <div class="profile-card" id="profileContent">
                <div id="profileGuest" style="text-align:center; padding:40px 0;">
                    <i class="fas fa-user" style="font-size:64px; color: var(--text-secondary);"></i>
                    <h3 style="margin-top:16px;">Войдите в аккаунт</h3>
                    <p style="color: var(--text-secondary);">Чтобы увидеть свой профиль и заказы</p>
                    <button class="btn btn-primary" onclick="toggleAuth()" style="margin-top:16px;">Войти</button>
                </div>
                <div id="profileUser" style="display:none;">
                    <div class="avatar-large" id="profileAvatar">?</div>
                    <div class="profile-name" id="profileName">Имя</div>
                    <div class="profile-email" id="profileEmail">email@example.com</div>
                    <div class="profile-role user" id="profileRole">Пользователь</div>
                    <div class="profile-stats">
                        <div class="stat">
                            <div class="stat-value" id="profileOrdersCount">0</div>
                            <div class="stat-label">Заказов</div>
                        </div>
                        <div class="stat">
                            <div class="stat-value" id="profileReviewsCount">0</div>
                            <div class="stat-label">Отзывов</div>
                        </div>
                    </div>
                    <button class="btn btn-danger btn-sm" onclick="logoutUser()" style="margin-top:12px;">Выйти</button>
                    <div class="profile-orders">
                        <h4>Мои заказы</h4>
                        <div id="profileOrdersList">
                            <p style="color: var(--text-secondary);">Заказов пока нет</p>
                        </div>
                    </div>
                    <div class="profile-orders" style="margin-top:16px;">
                        <h4>Мои отзывы</h4>
                        <div id="profileReviewsList">
                            <p style="color: var(--text-secondary);">Отзывов пока нет</p>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </section>

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    АДМИН
    ============================================================ -->
    <section class="section" id="adminSection" style="display:none;">
        <div class="container">
            <div class="admin-panel">
                <h3>Админ-панель — Добавление товара</h3>
                <form id="addProductForm" onsubmit="addProduct(event)">
                    <div class="form-row">
                        <div class="form-group">
                            <label>Название товара *</label>
                            <input type="text" id="productName" required placeholder="Например: Настенные часы" />
                        </div>
                        <div class="form-group">
                            <label>Цена (₽) *</label>
                            <input type="number" id="productPrice" required placeholder="500" />
                        </div>
                    </div>
                    <div class="form-row">
                        <div class="form-group">
                            <label>Категория *</label>
                            <select id="productCategory" required>
                                <option value="Настенные часы">Настенные часы</option>
                                <option value="Шкатулки">Шкатулки</option>
                                <option value="Хлебницы">Хлебницы</option>
                                <option value="Подарки">Подарки</option>
                            </select>
                        </div>
                        <div class="form-group">
                            <label>Фото</label>
                            <div class="file-upload">
                                <input type="file" id="productImage" accept="image/*" onchange="previewImage(event)" />
                                <button type="button" class="btn btn-secondary btn-sm" onclick="document.getElementById('productImage').click()">
                                    <i class="fas fa-upload"></i> Выбрать
                                </button>
                                <span class="file-name" id="fileName">Файл не выбран</span>
                                <img class="upload-preview" id="imagePreview" />
                            </div>
                        </div>
                    </div>
                    <div class="form-group">
                        <label>Описание</label>
                        <textarea id="productDescription" placeholder="Краткое описание товара..."></textarea>
                    </div>
                    <div class="form-group">
                        <label>Ссылка на фото (если не загружаете файл)</label>
                        <input type="text" id="productImageUrl" placeholder="https://example.com/photo.jpg" />
                    </div>
                    <button type="submit" class="btn btn-success" id="addProductBtn">➕ Добавить товар</button>
                </form>
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            <div class="admin-panel">
                <h3>Список товаров</h3>
                <div id="adminProductList"></div>
            </div>
        </div>
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    <!-- ============================================================
    ИЗБРАННОЕ
    ============================================================ -->
    <section class="section" id="favoritesSection" style="display:none;">
        <div class="container">
            <div class="section-header fade-up">
                <h2>Избранное</h2>
                <p>Товары, которые вам понравились</p>
            </div>
            <div class="products-grid" id="favoritesGrid"></div>
        </div>
    </section>

    <!-- ============================================================
    ДОСТАВКА
    ============================================================ -->
    <section class="section" id="deliverySection" style="display:none;">
        <div class="container">
            <div class="section-header fade-up">
                <h2>Доставка</h2>
                <p>Как мы доставляем наши изделия</p>
            </div>
            <div style="display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px;">
                <div class="category-card">
                    <div class="icon">📍</div>
                    <div class="name" style="font-size:18px;">Санкт-Петербург</div>
                    <p style="color: var(--text-secondary); font-size:14px; margin-top:8px;">Доставка от 1 дня<br /><strong>300 ₽</strong></p>
                </div>
                <div class="category-card">
                    <div class="icon">🏙️</div>
                    <div class="name" style="font-size:18px;">Ленинградская область</div>
                    <p style="color: var(--text-secondary); font-size:14px; margin-top:8px;">Доставка от 2 дней<br /><strong>500 ₽</strong></p>
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                <div class="category-card">
                    <div class="icon">🇷🇺</div>
                    <div class="name" style="font-size:18px;">Вся Россия</div>
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                    <div class="name" style="font-size:18px;">Самовывоз</div>
                    <p style="color: var(--text-secondary); font-size:14px; margin-top:8px;">Бесплатно<br />СПб, ул. Примерная, д.1</p>
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    <section class="section" id="contactsSection" style="display:none;">
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                <h2>Контакты</h2>
                <p>Свяжитесь с нами любым удобным способом</p>
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                <div class="category-card">
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                    <div class="name">Телефон</div>
                    <p style="color: var(--text-secondary);">+7 921 939 3478</p>
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                <div class="category-card">
                    <div class="icon">📍</div>
                    <div class="name">Адрес</div>
                    <p style="color: var(--text-secondary);">Санкт-Петербург</p>
                </div>
                <div class="category-card">
                    <div class="icon">💬</div>
                    <div class="name">Мессенджеры</div>
                    <p style="color: var(--text-secondary); font-size:14px;">
                        <a href="https://t.me/Dauivka" target="_blank" rel="noopener noreferrer" style="color: var(--primary-light); display: inline-flex; align-items: center; gap: 6px; margin: 4px 0;">
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                        <a href="https://max.ru/u/f9LHodD0cOL068G7MSXKM9vdo1E8-rXQIbl3LeDZdsUqQhysF_VxOEay_JQ" target="_blank" rel="noopener noreferrer" style="color: var(--primary-light); display: inline-flex; align-items: center; gap: 6px; margin: 4px 0;">
                            <i class="fas fa-comment-dots"></i> MAX
                        </a>
                    </p>
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                <div class="category-card">
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                    <div class="name">Время работы</div>
                    <p style="color: var(--text-secondary); font-size:14px;">Ежедневно<br />с 10:00 до 20:00</p>
                </div>
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    <!-- ============================================================
    ЧАТ
    ============================================================ -->
    <section class="section" id="chatSection" style="display:none;">
        <div class="container">
            <div class="section-header fade-up">
                <h2>Чат с продавцом</h2>
                <p>Задайте вопрос прямо сейчас</p>
            </div>
            <div style="max-width: 600px; margin: 0 auto; background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden;">
                <div id="chatMessages" style="height: 400px; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 8px;">
                    <div class="cart-empty" style="padding: 20px;">
                        <i class="fas fa-comment-dots"></i>
                        <p>Напишите ваше сообщение</p>
                    </div>
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                <div style="padding: 16px; border-top: 1px solid var(--border); display: flex; gap: 12px;">
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                    <button class="btn btn-primary" onclick="sendMessage()">Отправить</button>
                </div>
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                    <p>Изделия из фанеры ручной работы. Качество, проверенное временем.</p>
                </div>
                <div>
                    <h4>Навигация</h4>
                    <a onclick="showCatalog()">Каталог</a>
                    <a onclick="showDelivery()">Доставка</a>
                    <a onclick="showContacts()">Контакты</a>
                </div>
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                    <h4>Контакты</h4>
                    <p>📱 +7 921 939 3478</p>
                    <p>✉️ hggjhcug@gmail.com</p>
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    <!-- ============================================================
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    <script type="module">
        import { initializeApp } from "https://www.gstatic.com/firebasejs/10.7.1/firebase-app.js";
        import {
            getAuth,
            createUserWithEmailAndPassword,
            signInWithEmailAndPassword,
            signOut,
            onAuthStateChanged,
            updateProfile
        } from "https://www.gstatic.com/firebasejs/10.7.1/firebase-auth.js";
        import {
            getFirestore,
            collection,
            addDoc,
            getDocs,
            getDoc,
            doc,
            updateDoc,
            deleteDoc,
            query,
            where,
            orderBy,
            onSnapshot,
            serverTimestamp,
            setDoc,
            arrayUnion,
            arrayRemove,
            increment
        } from "https://www.gstatic.com/firebasejs/10.7.1/firebase-firestore.js";

        const firebaseConfig = {
            apiKey: "AIzaSyBH1pOrudMi0D12rx-QqFYJUWXHFLDxhx4",
            authDomain: "fanerochka-a9aa0.firebaseapp.com",
            projectId: "fanerochka-a9aa0",
            storageBucket: "fanerochka-a9aa0.firebasestorage.app",
            messagingSenderId: "605824383119",
            appId: "1:605824383119:web:124c6866e74ae703bf58fa"
        };

        const app = initializeApp(firebaseConfig);
        const auth = getAuth(app);
        const db = getFirestore(app);

        window.auth = auth;
        window.db = db;
        window.createUserWithEmailAndPassword = createUserWithEmailAndPassword;
        window.signInWithEmailAndPassword = signInWithEmailAndPassword;
        window.signOut = signOut;
        window.onAuthStateChanged = onAuthStateChanged;
        window.updateProfile = updateProfile;
        window.collection = collection;
        window.addDoc = addDoc;
        window.getDocs = getDocs;
        window.getDoc = getDoc;
        window.doc = doc;
        window.updateDoc = updateDoc;
        window.deleteDoc = deleteDoc;
        window.query = query;
        window.where = where;
        window.orderBy = orderBy;
        window.onSnapshot = onSnapshot;
        window.serverTimestamp = serverTimestamp;
        window.setDoc = setDoc;
        window.arrayUnion = arrayUnion;
        window.arrayRemove = arrayRemove;
        window.increment = increment;

        window.IMGBB_KEY = 'fc3ffbdd744747613f09660a67cff0dd';

        window.uploadToImgBB = async function(file) {
            const formData = new FormData();
            formData.append('image', file);
            formData.append('key', window.IMGBB_KEY);
            try {
                const response = await fetch('https://api.imgbb.com/1/upload', {
                    method: 'POST',
                    body: formData
                });
                const data = await response.json();
                if (data.success) {
                    return data.data.url;
                } else {
                    throw new Error(data.error.message || 'Ошибка загрузки');
                }
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                console.error('Ошибка загрузки на ImgBB:', error);
                throw error;
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        };

        console.log('✅ Firebase + ImgBB готовы!');

        let currentUser = null;
        let currentUserData = null;
        let allProducts = [];
        let cart = [];
        let favorites = [];
        let currentCategory = 'Все';
        let chatId = null;
        let allReviews = [];

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        const favoritesGrid = document.getElementById('favoritesGrid');
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        const cartTotalBlock = document.getElementById('cartTotalBlock');
        const cartTotalPrice = document.getElementById('cartTotalPrice');
        const cartActions = document.getElementById('cartActions');

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                document.getElementById('authPassword').value = '';
                document.getElementById('authName').value = '';
                document.getElementById('authError').classList.remove('show');
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            document.getElementById('authModal').classList.remove('active');
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            const subtitle = document.getElementById('authSubtitle');
            const btn = document.getElementById('authSubmitBtn');
            const toggleText = document.getElementById('authToggleText');
            const nameGroup = document.getElementById('authNameGroup');

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                title.textContent = 'Вход';
                subtitle.textContent = 'Войдите в свой аккаунт';
                btn.textContent = 'Войти';
                toggleText.innerHTML = 'Нет аккаунта? <span id="authToggleLink">Зарегистрироваться</span>';
                nameGroup.classList.add('hidden');
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                title.textContent = 'Регистрация';
                subtitle.textContent = 'Создайте новый аккаунт';
                btn.textContent = 'Зарегистрироваться';
                toggleText.innerHTML = 'Уже есть аккаунт? <span id="authToggleLink">Войти</span>';
                nameGroup.classList.remove('hidden');
            }
            document.getElementById('authToggleLink').onclick = () => {
                setAuthMode(isLoginMode ? 'register' : 'login');
            };
            document.getElementById('authError').classList.remove('show');
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            const name = document.getElementById('authName').value.trim();
            const errorEl = document.getElementById('authError');

            if (!email || !password) {
                errorEl.textContent = 'Заполните все поля!';
                errorEl.classList.add('show');
                return;
            }

            try {
                if (isLoginMode) {
                    const userCred = await signInWithEmailAndPassword(auth, email, password);
                    console.log('✅ Вход выполнен:', userCred.user.uid);
                    closeAuth();
                } else {
                    if (!name) {
                        errorEl.textContent = 'Введите имя!';
                        errorEl.classList.add('show');
                        return;
                    }
                    const userCred = await createUserWithEmailAndPassword(auth, email, password);
                    await updateProfile(userCred.user, { displayName: name });
                    await setDoc(doc(db, 'users', userCred.user.uid), {
                        name: name,
                        email: email,
                        role: 'user',
                        createdAt: serverTimestamp()
                    });
                    console.log('✅ Регистрация выполнена:', userCred.user.uid);
                    closeAuth();
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                console.error('Ошибка:', error);
                errorEl.textContent = error.message || 'Ошибка авторизации';
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                await loadUserFavorites();
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                currentUser = null;
                currentUserData = null;
                document.getElementById('authBtn').classList.remove('hidden');
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                document.getElementById('mobileAdminLink').classList.add('hidden');
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                cart = [];
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                console.error('Ошибка выхода:', error);
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            if (!currentUser) return;
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                const cartDoc = await getDoc(doc(db, 'cart', currentUser.uid));
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                    cart = cartDoc.data().items || [];
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            if (!currentUser) return;
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                await setDoc(doc(db, 'cart', currentUser.uid), { items: cart });
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                console.error('Ошибка сохранения корзины:', error);
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                    name: product.name,
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                    image: product.image || 'https://via.placeholder.com/100/1a2a4a/3b82f6?text=Фото',
                    quantity: 1
                });
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        };

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            cart = cart.filter(item => item.id !== productId);
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        window.updateCartQuantity = function(productId, delta) {
            const item = cart.find(i => i.id === productId);
            if (!item) return;
            item.quantity += delta;
            if (item.quantity <= 0) {
                cart = cart.filter(i => i.id !== productId);
            }
            saveCart();
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            cart = [];
            saveCart();
        };

        window.checkout = async function() {
            if (cart.length === 0) return;
            if (!currentUser) {
                alert('Войдите в аккаунт для оформления заказа!');
                toggleAuth();
                return;
            }
            const total = cart.reduce((sum, item) => sum + item.price * item.quantity, 0);
            if (confirm(`Оформить заказ на сумму ${total} ₽?`)) {
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                    await addDoc(collection(db, 'orders'), {
                        userId: currentUser.uid,
                        userName: currentUser.displayName || 'Пользователь',
                        items: cart,
                        total: total,
                        status: 'new',
                        createdAt: serverTimestamp()
                    });
                    alert('✅ Заказ оформлен! С вами свяжутся в ближайшее время.');
                    cart = [];
                    saveCart();
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                    console.error('Ошибка оформления заказа:', error);
                    alert('Ошибка оформления заказа. Попробуйте позже.');
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        function updateCartUI() {
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            cartBadge.textContent = count;
            cartBadge.classList.toggle('hidden', count === 0);

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                                <p>Корзина пуста</p>
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                return;
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                                <div class="details">
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                                    <div class="price">${item.price} ₽ × ${item.quantity}</div>
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                                <div class="qty-control">
                                    <button onclick="updateCartQuantity('${item.id}', -1)">−</button>
                                    <span>${item.quantity}</span>
                                    <button onclick="updateCartQuantity('${item.id}', 1)">+</button>
                                </div>
                                <button class="remove" onclick="removeFromCart('${item.id}')">&times;</button>
                            </div>
                        `;
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            cartTotalPrice.textContent = total + ' ₽';
            cartActions.classList.remove('hidden');
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            const sidebar = document.getElementById('cartSidebar');
            const overlay = document.getElementById('cartOverlay');
            sidebar.classList.toggle('open');
            overlay.classList.toggle('active');
        };

        async function loadUserFavorites() {
            if (!currentUser) return;
            try {
                const favDoc = await getDoc(doc(db, 'favorites', currentUser.uid));
                if (favDoc.exists()) {
                    favorites = favDoc.data().items || [];
                } else {
                    favorites = [];
                    await setDoc(doc(db, 'favorites', currentUser.uid), { items: [] });
                }
            } catch (error) {
                console.error('Ошибка загрузки избранного:', error);
            }
        }

        async function saveFavorites() {
            if (!currentUser) return;
            try {
                await setDoc(doc(db, 'favorites', currentUser.uid), { items: favorites });
            } catch (error) {
                console.error('Ошибка сохранения избранного:', error);
            }
        }

        window.toggleFavorite = async function(productId) {
            if (!currentUser) {
                alert('Войдите в аккаунт, чтобы добавлять в избранное!');
                toggleAuth();
                return;
            }
            const index = favorites.indexOf(productId);
            if (index === -1) {
                favorites.push(productId);
            } else {
                favorites.splice(index, 1);
            }
            await saveFavorites();
            renderProducts();
        };

        window.isFavorite = function(productId) {
            return favorites.includes(productId);
        };

        window.showFavorites = function() {
            hideAllSections();
            document.getElementById('favoritesSection').style.display = 'block';
            renderFavorites();
        };

        function renderFavorites() {
            const grid = document.getElementById('favoritesGrid');
            const favProducts = allProducts.filter(p => favorites.includes(p.id));
            if (favProducts.length === 0) {
                grid.innerHTML = `
                            <div class="cart-empty" style="grid-column: 1/-1;">
                                <i class="fas fa-heart"></i>
                                <p>У вас пока нет избранных товаров</p>
                            </div>
                        `;
                return;
            }
            grid.innerHTML = favProducts.map(p => renderProductCard(p)).join('');
        }

        window.canReview = async function(productId) {
            if (!currentUser) return false;
            try {
                const ordersRef = collection(db, 'orders');
                const q = query(ordersRef,
                    where('userId', '==', currentUser.uid),
                    where('status', '==', 'completed')
                );
                const snapshot = await getDocs(q);
                let hasPurchased = false;
                snapshot.forEach(doc => {
                    const order = doc.data();
                    if (order.items && order.items.some(item => item.id === productId)) {
                        hasPurchased = true;
                    }
                });
                return hasPurchased;
            } catch (error) {
                console.error('Ошибка проверки права на отзыв:', error);
                return false;
            }
        };

        window.addReview = async function(productId, rating, text) {
            if (!currentUser) {
                alert('Войдите в аккаунт!');
                return;
            }
            if (!await canReview(productId)) {
                alert('Вы можете оставить отзыв только после покупки товара!');
                return;
            }
            if (!rating || !text) {
                alert('Заполните все поля!');
                return;
            }
            try {
                await addDoc(collection(db, 'reviews'), {
                    productId: productId,
                    userId: currentUser.uid,
                    userName: currentUser.displayName || 'Пользователь',
                    rating: rating,
                    text: text,
                    createdAt: serverTimestamp()
                });
                alert('✅ Спасибо за ваш отзыв!');
                loadProducts();
            } catch (error) {
                console.error('Ошибка добавления отзыва:', error);
                alert('Ошибка: ' + error.message);
            }
        };

        window.loadReviews = async function(productId) {
            try {
                const q = query(
                    collection(db, 'reviews'),
                    where('productId', '==', productId),
                    orderBy('createdAt', 'desc')
                );
                const snapshot = await getDocs(q);
                return snapshot.docs.map(doc => ({
                    id: doc.id,
                    ...doc.data()
                }));
            } catch (error) {
                console.error('Ошибка загрузки отзывов:', error);
                return [];
            }
        };

        window.getAverageRating = function(reviews) {
            if (!reviews || reviews.length === 0) return 0;
            const sum = reviews.reduce((acc, r) => acc + r.rating, 0);
            return (sum / reviews.length).toFixed(1);
        };

        window.openReviewForm = function(productId) {
            const rating = prompt('Оцените товар от 1 до 5 звезд:');
            if (rating === null) return;
            const numRating = parseInt(rating);
            if (isNaN(numRating) || numRating < 1 || numRating > 5) {
                alert('Введите число от 1 до 5!');
                return;
            }
            const text = prompt('Напишите ваш отзыв:');
            if (text === null || text.trim() === '') {
                alert('Напишите текст отзыва!');
                return;
            }
            addReview(productId, numRating, text.trim());
        };

        function renderProductCard(product) {
            const isFav = isFavorite(product.id);
            let reviewBtnHtml = '';

            if (currentUser) {
                reviewBtnHtml = `
                            <button class="btn btn-secondary btn-sm review-btn" 
                                    data-product-id="${product.id}"
                                    onclick="openReviewForm('${product.id}')"
                                    style="display:none;">
                                <i class="fas fa-star"></i> Оставить отзыв
                            </button>
                        `;
            }

            return `
                        <div class="product-card" id="product-${product.id}">
                            <img class="product-img" src="${product.image || 'https://via.placeholder.com/400x300/1a2a4a/3b82f6?text=Фанерочка'}" alt="${product.name}" loading="lazy" />
                            <button class="product-favorite ${isFav ? 'active' : ''}" onclick="toggleFavorite('${product.id}')">
                                <i class="fas fa-heart"></i>
                            </button>
                            <div class="info">
                                <span class="category-tag">${product.category || 'Без категории'}</span>
                                <h3>${product.name}</h3>
                                <div class="desc">${product.description || 'Красивое изделие из фанеры ручной работы.'}</div>
                                <div class="price">${product.price} ₽</div>
                                <div class="actions">
                                    <button class="btn btn-primary" onclick="addToCart('${product.id}')">
                                        <i class="fas fa-shopping-cart"></i> В корзину
                                    </button>
                                    ${currentUserData?.role === 'admin' ? `
                                        <button class="btn btn-danger btn-sm" onclick="deleteProduct('${product.id}')">
                                            <i class="fas fa-trash"></i>
                                        </button>
                                    ` : ''}
                                    ${reviewBtnHtml}
                                </div>
                                <div class="reviews-section" id="reviews-${product.id}">
                                    <div class="reviews-header">
                                        <span class="reviews-rating">⭐ <span id="rating-${product.id}">0</span></span>
                                        <span class="reviews-count" id="reviews-count-${product.id}">0 отзывов</span>
                                    </div>
                                    <div class="reviews-list" id="reviews-list-${product.id}">
                                        <p style="color: var(--text-secondary); font-size:13px;">Загрузка отзывов...</p>
                                    </div>
                                </div>
                            </div>
                        </div>
                    `;
        }

        async function loadProducts() {
            try {
                const q = query(collection(db, 'products'), orderBy('createdAt', 'desc'));
                const snapshot = await getDocs(q);
                allProducts = snapshot.docs.map(doc => ({
                    id: doc.id,
                    ...doc.data()
                }));
                document.getElementById('productsCount').textContent = allProducts.length;

                renderProducts();
                renderFavorites();
                renderAdminProducts();

                for (const product of allProducts) {
                    const reviews = await loadReviews(product.id);
                    const avg = getAverageRating(reviews);

                    const ratingEl = document.getElementById(`rating-${product.id}`);
                    const countEl = document.getElementById(`reviews-count-${product.id}`);
                    const listEl = document.getElementById(`reviews-list-${product.id}`);

                    if (ratingEl) ratingEl.textContent = avg || '0';
                    if (countEl) countEl.textContent = `${reviews.length} отзывов`;

                    if (listEl) {
                        if (reviews.length === 0) {
                            listEl.innerHTML = '<p style="color: var(--text-secondary); font-size:13px;">Пока нет отзывов</p>';
                        } else {
                            listEl.innerHTML = reviews.map(r => `
                                        <div class="review-item">
                                            <div class="review-header">
                                                <span class="review-author">${r.userName}</span>
                                                <span class="review-date">${new Date(r.createdAt?.toMillis()).toLocaleDateString()}</span>
                                            </div>
                                            <div class="stars" style="font-size:14px;">
                                                ${'⭐'.repeat(r.rating)}${'☆'.repeat(5 - r.rating)}
                                            </div>
                                            <div class="review-text">${r.text}</div>
                                        </div>
                                    `).join('');
                        }
                    }

                    if (currentUser) {
                        const btn = document.querySelector(`.review-btn[data-product-id="${product.id}"]`);
                        if (btn && await canReview(product.id)) {
                            btn.style.display = 'inline-flex';
                        }
                    }
                }

            } catch (error) {
                console.error('Ошибка загрузки товаров:', error);
            }
        }

        function renderProducts() {
            let filtered = allProducts;
            if (currentCategory !== 'Все') {
                filtered = allProducts.filter(p => p.category === currentCategory);
            }
            if (filtered.length === 0) {
                productsGrid.innerHTML = `
                            <div class="cart-empty" style="grid-column: 1/-1;">
                                <i class="fas fa-box-open"></i>
                                <p>Товаров пока нет</p>
                            </div>
                        `;
                return;
            }
            productsGrid.innerHTML = filtered.map(p => renderProductCard(p)).join('');
        }

        window.filterByCategory = function(category) {
            currentCategory = category;
            renderProducts();
        };

        window.showCatalog = function() {
            hideAllSections();
            document.getElementById('catalogSection').style.display = 'block';
        };

        window.toggleSearch = function() {
            const section = document.getElementById('searchSection');
            if (section.style.display === 'block') {
                section.style.display = 'none';
                document.getElementById('searchInput').value = '';
                document.getElementById('searchResults').innerHTML = '';
            } else {
                hideAllSections();
                section.style.display = 'block';
                document.getElementById('searchInput').focus();
            }
        };

        window.searchProducts = function() {
            const query = document.getElementById('searchInput').value.toLowerCase().trim();
            const results = document.getElementById('searchResults');
            if (!query) {
                results.innerHTML = '';
                return;
            }
            const filtered = allProducts.filter(p =>
                p.name.toLowerCase().includes(query) ||
                (p.description && p.description.toLowerCase().includes(query))
            );
            if (filtered.length === 0) {
                results.innerHTML = `
                            <div class="cart-empty" style="grid-column: 1/-1;">
                                <i class="fas fa-search"></i>
                                <p>Ничего не найдено</p>
                            </div>
                        `;
                return;
            }
            results.innerHTML = filtered.map(p => renderProductCard(p)).join('');
        };

        window.clearSearch = function() {
            document.getElementById('searchInput').value = '';
            document.getElementById('searchResults').innerHTML = '';
        };

        window.showAdmin = function() {
            if (currentUserData?.role !== 'admin') {
                alert('Доступ только для администратора!');
                return;
            }
            hideAllSections();
            document.getElementById('adminSection').style.display = 'block';
            renderAdminProducts();
        };

        window.previewImage = function(event) {
            const file = event.target.files[0];
            const nameEl = document.getElementById('fileName');
            const preview = document.getElementById('imagePreview');
            if (file) {
                nameEl.textContent = file.name;
                const reader = new FileReader();
                reader.onload = (e) => {
                    preview.src = e.target.result;
                    preview.classList.add('show');
                };
                reader.readAsDataURL(file);
            } else {
                nameEl.textContent = 'Файл не выбран';
                preview.classList.remove('show');
            }
        };

        window.addProduct = async function(event) {
            event.preventDefault();
            if (currentUserData?.role !== 'admin') {
                alert('Только администратор может добавлять товары!');
                return;
            }

            const name = document.getElementById('productName').value.trim();
            const price = parseInt(document.getElementById('productPrice').value);
            const category = document.getElementById('productCategory').value;
            const description = document.getElementById('productDescription').value.trim();
            const imageUrl = document.getElementById('productImageUrl').value.trim();
            const fileInput = document.getElementById('productImage');
            const btn = document.getElementById('addProductBtn');

            if (!name || !price) {
                alert('Заполните обязательные поля!');
                return;
            }

            let finalImageUrl = imageUrl || 'https://via.placeholder.com/400x300/1a2a4a/3b82f6?text=Фанерочка';

            if (fileInput.files.length > 0) {
                btn.textContent = '⏳ Загрузка...';
                btn.disabled = true;
                try {
                    finalImageUrl = await uploadToImgBB(fileInput.files[0]);
                } catch (error) {
                    alert('Ошибка загрузки фото: ' + error.message);
                    btn.textContent = '➕ Добавить товар';
                    btn.disabled = false;
                    return;
                }
                btn.textContent = '➕ Добавить товар';
                btn.disabled = false;
            }

            try {
                await addDoc(collection(db, 'products'), {
                    name: name,
                    price: price,
                    category: category,
                    description: description || 'Красивое изделие из фанеры.',
                    image: finalImageUrl,
                    createdAt: serverTimestamp()
                });

                alert('✅ Товар добавлен!');
                document.getElementById('addProductForm').reset();
                document.getElementById('fileName').textContent = 'Файл не выбран';
                document.getElementById('imagePreview').classList.remove('show');
                loadProducts();
            } catch (error) {
                console.error('Ошибка добавления товара:', error);
                alert('Ошибка: ' + error.message);
            }
        };

        window.deleteProduct = async function(productId) {
            if (currentUserData?.role !== 'admin') {
                alert('Только администратор может удалять товары!');
                return;
            }
            if (!confirm('Удалить этот товар?')) return;
            try {
                await deleteDoc(doc(db, 'products', productId));
                loadProducts();
            } catch (error) {
                console.error('Ошибка удаления:', error);
                alert('Ошибка удаления: ' + error.message);
            }
        };

        function renderAdminProducts() {
            const container = document.getElementById('adminProductList');
            if (allProducts.length === 0) {
                container.innerHTML = '<p style="color: var(--text-secondary);">Товаров пока нет</p>';
                return;
            }
            let html = '<div style="display: grid; grid-template-columns: 1fr 1fr; gap: 12px;">';
            allProducts.forEach(p => {
                html += `
                            <div style="display: flex; justify-content: space-between; align-items: center; background: var(--bg); padding: 12px 16px; border-radius: var(--radius-sm); border: 1px solid var(--border);">
                                <span>${p.name} — ${p.price} ₽</span>
                                <button class="btn btn-danger btn-sm" onclick="deleteProduct('${p.id}')">🗑️</button>
                            </div>
                        `;
            });
            html += '</div>';
            container.innerHTML = html;
        }

        window.showProfile = function() {
            if (!currentUser) {
                toggleAuth();
                return;
            }
            hideAllSections();
            document.getElementById('profileSection').style.display = 'block';
            renderProfile();
        };

        async function renderProfile() {
            if (!currentUser) {
                document.getElementById('profileGuest').style.display = 'block';
                document.getElementById('profileUser').style.display = 'none';
                return;
            }

            document.getElementById('profileGuest').style.display = 'none';
            document.getElementById('profileUser').style.display = 'block';

            const userDoc = await getDoc(doc(db, 'users', currentUser.uid));
            const userData = userDoc.exists() ? userDoc.data() : {};

            document.getElementById('profileAvatar').textContent = (currentUser.displayName || 'U')[0].toUpperCase();
            document.getElementById('profileName').textContent = currentUser.displayName || 'Пользователь';
            document.getElementById('profileEmail').textContent = currentUser.email || '';
            document.getElementById('profileRole').textContent = userData.role === 'admin' ? 'Администратор' : 'Пользователь';
            document.getElementById('profileRole').className = `profile-role ${userData.role === 'admin' ? 'admin' : 'user'}`;

            const ordersRef = collection(db, 'orders');
            const qOrders = query(ordersRef, where('userId', '==', currentUser.uid), orderBy('createdAt', 'desc'));
            const ordersSnapshot = await getDocs(qOrders);
            const orders = ordersSnapshot.docs.map(doc => ({ id: doc.id, ...doc.data() }));
            document.getElementById('profileOrdersCount').textContent = orders.length;

            if (orders.length === 0) {
                document.getElementById('profileOrdersList').innerHTML = '<p style="color: var(--text-secondary);">Заказов пока нет</p>';
            } else {
                document.getElementById('profileOrdersList').innerHTML = orders.map(order => `
                            <div class="order-item">
                                <div class="order-header">
                                    <span class="order-id">Заказ #${order.id.slice(0, 8)}</span>
                                    <span class="order-status ${order.status}">${order.status === 'completed' ? '✅ Выполнен' : '🔄 В обработке'}</span>
                                </div>
                                <div class="order-items">${order.items.map(item => `${item.name} × ${item.quantity}`).join(', ')}</div>
                                <div class="order-total">${order.total} ₽</div>
                                <div class="order-date">${new Date(order.createdAt?.toMillis()).toLocaleDateString()}</div>
                            </div>
                        `).join('');
            }

            const reviewsRef = collection(db, 'reviews');
            const qReviews = query(reviewsRef, where('userId', '==', currentUser.uid), orderBy('createdAt', 'desc'));
            const reviewsSnapshot = await getDocs(qReviews);
            const reviews = reviewsSnapshot.docs.map(doc => ({ id: doc.id, ...doc.data() }));
            document.getElementById('profileReviewsCount').textContent = reviews.length;

            if (reviews.length === 0) {
                document.getElementById('profileReviewsList').innerHTML = '<p style="color: var(--text-secondary);">Отзывов пока нет</p>';
            } else {
                document.getElementById('profileReviewsList').innerHTML = reviews.map(r => `
                            <div class="review-item">
                                <div class="review-header">
                                    <span class="review-author">Товар: ${allProducts.find(p => p.id === r.productId)?.name || 'Удалённый товар'}</span>
                                    <span class="review-date">${new Date(r.createdAt?.toMillis()).toLocaleDateString()}</span>
                                </div>
                                <div class="stars" style="font-size:14px;">
                                    ${'⭐'.repeat(r.rating)}${'☆'.repeat(5 - r.rating)}
                                </div>
                                <div class="review-text">${r.text}</div>
                            </div>
                        `).join('');
            }
        }

        window.showDelivery = function() {
            hideAllSections();
            document.getElementById('deliverySection').style.display = 'block';
        };

        window.showContacts = function() {
            hideAllSections();
            document.getElementById('contactsSection').style.display = 'block';
        };

        window.openChat = function() {
            if (!currentUser) {
                alert('Войдите в аккаунт, чтобы написать продавцу!');
                toggleAuth();
                return;
            }
            hideAllSections();
            document.getElementById('chatSection').style.display = 'block';
            loadChat();
        };

        async function loadChat() {
            if (!currentUser) return;
            try {
                const q = query(collection(db, 'chats'), where('participants', 'array-contains', currentUser.uid));
                const snapshot = await getDocs(q);
                if (!snapshot.empty) {
                    chatId = snapshot.docs[0].id;
                } else {
                    const docRef = await addDoc(collection(db, 'chats'), {
                        participants: [currentUser.uid, 'seller'],
                        createdAt: serverTimestamp()
                    });
                    chatId = docRef.id;
                }
                listenMessages();
            } catch (error) {
                console.error('Ошибка загрузки чата:', error);
            }
        }

        function listenMessages() {
            if (!chatId) return;
            const messagesRef = collection(db, 'chats', chatId, 'messages');
            const q = query(messagesRef, orderBy('timestamp', 'asc'));

            onSnapshot(q, (snapshot) => {
                const container = document.getElementById('chatMessages');
                if (snapshot.empty) {
                    container.innerHTML = `
                                <div class="cart-empty" style="padding: 20px;">
                                    <i class="fas fa-comment-dots"></i>
                                    <p>Напишите ваше сообщение</p>
                                </div>
                            `;
                    return;
                }
                let html = '';
                snapshot.forEach(doc => {
                    const msg = doc.data();
                    const isMine = msg.senderId === currentUser?.uid;
                    html += `
                                <div style="display: flex; justify-content: ${isMine ? 'flex-end' : 'flex-start'};">
                                    <div style="background: ${isMine ? 'var(--primary-light)' : 'var(--bg)'}; padding: 10px 16px; border-radius: 12px; max-width: 80%; border: 1px solid var(--border);">
                                        <strong style="font-size: 12px; color: var(--text-secondary);">${isMine ? 'Вы' : 'Продавец'}</strong>
                                        <p style="margin: 4px 0 0;">${msg.text}</p>
                                        <span style="font-size: 10px; color: var(--text-secondary);">${new Date(msg.timestamp?.toMillis()).toLocaleTimeString()}</span>
                                    </div>
                                </div>
                            `;
                });
                container.innerHTML = html;
                container.scrollTop = container.scrollHeight;
            });
        }

        window.sendMessage = async function() {
            const input = document.getElementById('chatInput');
            const text = input.value.trim();
            if (!text || !chatId || !currentUser) return;

            try {
                await addDoc(collection(db, 'chats', chatId, 'messages'), {
                    senderId: currentUser.uid,
                    text: text,
                    timestamp: serverTimestamp()
                });
                input.value = '';
            } catch (error) {
                console.error('Ошибка отправки:', error);
                alert('Ошибка отправки сообщения');
            }
        };

        const burgerBtn = document.getElementById('burgerBtn');
        const mobileMenu = document.getElementById('mobileMenu');
        const menuOverlay = document.getElementById('menuOverlay');

        if (burgerBtn) {
            burgerBtn.addEventListener('click', function() {
                mobileMenu.classList.toggle('open');
                menuOverlay.classList.toggle('active');
                burgerBtn.classList.toggle('active');
            });
        }

        window.closeMobileMenu = function() {
            if (mobileMenu) {
                mobileMenu.classList.remove('open');
                menuOverlay.classList.remove('active');
                if (burgerBtn) burgerBtn.classList.remove('active');
            }
        };

        const closeMenuBtn = document.getElementById('closeMenuBtn');
        if (closeMenuBtn) {
            closeMenuBtn.addEventListener('click', closeMobileMenu);
        }
        if (menuOverlay) {
            menuOverlay.addEventListener('click', closeMobileMenu);
        }

        window.addEventListener('scroll', () => {
            const navbar = document.getElementById('navbar');
            if (window.scrollY > 50) {
                navbar.classList.add('scrolled');
            } else {
                navbar.classList.remove('scrolled');
            }
        });

        const observer = new IntersectionObserver((entries) => {
            entries.forEach(entry => {
                if (entry.isIntersecting) {
                    entry.target.classList.add('visible');
                }
            });
        }, { threshold: 0.1 });

        document.querySelectorAll('.fade-up').forEach(el => observer.observe(el));

        function hideAllSections() {
            document.querySelectorAll('.section').forEach(el => {
                el.style.display = 'none';
            });
            document.getElementById('profileSection').style.display = 'none';
            document.getElementById('searchSection').style.display = 'none';
            document.getElementById('searchResults').innerHTML = '';
            document.getElementById('searchInput').value = '';
        }

        showCatalog();

        console.log('🚀 Фанерочка запущена!');
    </script>

</body>
</html>