* { margin: 0; padding: 0; box-sizing: border-box }
        :root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --success: #10b981;
            --warning: #f59e0b;
            --danger: #ef4444;
            --gradient-primary: linear-gradient(135deg,#667eea 0%,#764ba2 100%);
            --gradient-success: linear-gradient(135deg,#10b981,#059669);
            --gradient-danger: linear-gradient(135deg,#ef4444,#dc2626);
            --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
            --border-radius: .75rem;
            --border-radius-lg: 1rem;
            --border-radius-2xl: 1.5rem;
            --border-radius-full: 9999px
        }
        :root.light {
            --bg-body: linear-gradient(135deg,#667eea 0%,#764ba2 100%);
            --bg-card: #fff;
            --bg-sidebar: #fff;
            --bg-header: rgba(255,255,255,.95);
            --text-primary: #1e293b;
            --text-secondary: #475569;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
            --gray-100: #f1f5f9;
            --gray-200: #e2e8f0;
            --gray-300: #cbd5e1;
            --gray-400: #94a3b8;
            --gray-500: #64748b;
            --gray-600: #475569;
            --gray-700: #334155;
            --gray-800: #1e293b
        }
        :root.dark {
            --bg-body: linear-gradient(135deg,#0f0f1a 0%,#1a1a2e 100%);
            --bg-card: #1e293b;
            --bg-sidebar: #0f172a;
            --bg-header: rgba(15,23,42,.95);
            --text-primary: #f1f5f9;
            --text-secondary: #cbd5e1;
            --text-muted: #94a3b8;
            --border-color: #334155;
            --gray-100: #1e293b;
            --gray-200: #334155;
            --gray-300: #475569;
            --gray-400: #64748b;
            --gray-500: #94a3b8;
            --gray-600: #cbd5e1;
            --gray-700: #e2e8f0;
            --gray-800: #f1f5f9
        }
        body { font-family: 'Inter',sans-serif; background: var(--bg-body); color: var(--text-primary); line-height: 1.5; min-height: 100vh; transition: background .3s ease, color .3s ease }

        /* AI Assistant Styles */
        .ai-assistant { position: fixed; bottom: 24px; right: 24px; z-index: 1000; }
        .ai-button { width: 60px; height: 60px; background: var(--gradient-primary); border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; box-shadow: var(--shadow-lg); transition: all 0.3s ease; border: none; color: white; font-size: 28px; }
        .ai-button:hover { transform: scale(1.05); }
        .ai-button.active { background: var(--gradient-danger); }
        .ai-chat-window { position: fixed; bottom: 100px; right: 24px; width: 380px; height: 520px; background: var(--bg-card); border-radius: var(--border-radius-2xl); box-shadow: var(--shadow-lg); display: flex; flex-direction: column; overflow: hidden; transform: scale(0); opacity: 0; transition: all 0.3s ease; transform-origin: bottom right; border: 1px solid var(--border-color); z-index: 999; }
        .ai-chat-window.active { transform: scale(1); opacity: 1; }
        .ai-chat-header { background: var(--gradient-primary); color: white; padding: 16px; display: flex; justify-content: space-between; align-items: center; }
        .ai-chat-header h3 { font-size: 16px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
        .ai-chat-header i { font-size: 20px; }
        .ai-close { background: none; border: none; color: white; font-size: 20px; cursor: pointer; padding: 4px; }
        .ai-messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
        .ai-message { display: flex; gap: 10px; animation: fadeIn 0.3s ease; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
        .ai-message.user { flex-direction: row-reverse; }
        .ai-avatar { width: 32px; height: 32px; background: var(--gradient-primary); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: white; font-size: 14px; flex-shrink: 0; }
        .ai-message.user .ai-avatar { background: var(--gray-400); }
        .ai-bubble { max-width: 75%; padding: 10px 14px; border-radius: 18px; font-size: 13px; line-height: 1.4; background: var(--gray-100); color: var(--text-primary); }
        .ai-message.user .ai-bubble { background: var(--gradient-primary); color: white; }
        .ai-typing { display: flex; gap: 4px; padding: 8px 12px; }
        .ai-typing span { width: 6px; height: 6px; background: var(--text-muted); border-radius: 50%; animation: typing 1.4s infinite; }
        .ai-typing span:nth-child(2) { animation-delay: 0.2s; }
        .ai-typing span:nth-child(3) { animation-delay: 0.4s; }
        @keyframes typing { 0%,60%,100% { transform: translateY(0); opacity: 0.4; } 30% { transform: translateY(-4px); opacity: 1; } }
        .ai-input-area { padding: 16px; border-top: 1px solid var(--border-color); display: flex; gap: 8px; }
        .ai-input-area input { flex: 1; padding: 10px 14px; border: 1px solid var(--border-color); border-radius: var(--border-radius-full); outline: none; background: var(--bg-card); color: var(--text-primary); font-size: 13px; }
        .ai-input-area input:focus { border-color: var(--primary); }
        .ai-input-area button { background: var(--gradient-primary); border: none; color: white; padding: 8px 18px; border-radius: var(--border-radius-full); cursor: pointer; font-size: 13px; font-weight: 500; }
        .ai-suggestions { padding: 8px 16px; display: flex; gap: 8px; flex-wrap: wrap; border-top: 1px solid var(--border-color); }
        .ai-suggestion { background: var(--gray-100); padding: 6px 12px; border-radius: var(--border-radius-full); font-size: 11px; cursor: pointer; transition: all 0.2s; color: var(--text-secondary); }
        .ai-suggestion:hover { background: var(--primary); color: white; }
        @media (max-width: 480px) { .ai-chat-window { width: calc(100vw - 32px); right: 16px; bottom: 90px; height: 460px; } }

        .loading-screen { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: var(--gradient-primary); display: flex; justify-content: center; align-items: center; z-index: 9999; transition: opacity .5s ease; flex-direction: column }
        .loading-screen.hidden { opacity: 0; pointer-events: none }
        .loading-spinner { width: 60px; height: 60px; border: 4px solid rgba(255,255,255,.2); border-top-color: #fff; border-radius: 50%; animation: spin 1s linear infinite; margin-bottom: 20px }
        .loading-text { color: #fff; font-size: 24px; font-weight: 600 }
        @keyframes spin { to { transform: rotate(360deg); } }
        .header { background: var(--bg-header); backdrop-filter: blur(10px); border-bottom: 2px solid rgba(99,102,241,.2); position: sticky; top: 0; z-index: 100; box-shadow: var(--shadow); transition: background .3s ease }
        .header-content { max-width: 1400px; margin: 0 auto; padding: 10px 16px; display: flex; justify-content: space-between; align-items: center; gap: 10px }
        .logo { display: flex; align-items: center; gap: 8px; text-decoration: none; flex-shrink: 0 }
        .logo-icon { width: 36px; height: 36px; background: var(--gradient-primary); border-radius: var(--border-radius-lg); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 16px; box-shadow: var(--shadow-lg) }
        .logo-text h1 { font-size: 18px; font-weight: 700; background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent }
        .logo-text p { font-size: 9px; color: var(--text-muted) }
        .header-controls { display: flex; gap: 8px; align-items: center; flex-shrink: 0 }
        .theme-toggle,.menu-toggle { background: var(--gray-200); border: none; width: 38px; height: 38px; border-radius: var(--border-radius-full); cursor: pointer; font-size: 16px; display: flex; align-items: center; justify-content: center; transition: all .3s; color: var(--text-primary) }
        .theme-toggle:hover,.menu-toggle:hover { transform: scale(1.02); background: var(--gray-300) }
        .admin-btn,.cart-btn { padding: 6px 14px; border-radius: var(--border-radius-full); border: 1px solid var(--border-color); background: var(--bg-card); color: var(--text-primary); font-size: 13px; font-weight: 500; display: flex; align-items: center; gap: 6px; cursor: pointer; transition: all .3s ease; text-decoration: none }
        .admin-btn { background: linear-gradient(135deg,#ef4444,#dc2626); color: #fff; border: none }
        .admin-btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg) }
        .cart-btn:hover { border-color: var(--primary); color: var(--primary) }
        .cart-count { background: var(--gradient-primary); color: #fff; padding: 2px 6px; border-radius: var(--border-radius-full); font-size: 11px; margin-left: 4px }
        .sidebar { position: fixed; top: 0; left: -280px; width: 280px; height: 100%; background: var(--bg-sidebar); z-index: 1000; transition: left .3s ease; box-shadow: var(--shadow-lg); overflow-y: auto }
        .sidebar.active { left: 0 }
        .sidebar-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,.5); z-index: 999; opacity: 0; visibility: hidden; transition: all .3s ease }
        .sidebar-overlay.active { opacity: 1; visibility: visible }
        .sidebar-header { background: var(--gradient-primary); padding: 25px 20px; text-align: center; color: #fff }
        .sidebar-avatar { width: 70px; height: 70px; background: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 12px; font-size: 32px; color: var(--primary) }
        .sidebar-header h3 { font-size: 18px; margin-bottom: 4px }
        .sidebar-header p { font-size: 11px; opacity: .8 }
        .sidebar-menu { padding: 16px 0 }
        .sidebar-menu-item { display: flex; align-items: center; gap: 12px; padding: 12px 20px; color: var(--text-secondary); transition: all .3s; cursor: pointer; border-left: 3px solid transparent; font-size: 14px }
        .sidebar-menu-item:hover,.sidebar-menu-item.active { background: var(--gray-100); border-left-color: var(--primary); color: var(--primary) }
        .sidebar-menu-item i { width: 22px; font-size: 16px }
        .sidebar-categories { margin-top: 8px; border-top: 1px solid var(--border-color); padding-top: 8px }
        .sidebar-category-item { display: flex; align-items: center; gap: 10px; padding: 10px 20px; font-size: 13px; color: var(--text-secondary); cursor: pointer; transition: all .2s }
        .sidebar-category-item:hover { background: var(--gray-100); color: var(--primary); padding-left: 25px }
        .logout-btn { margin-top: 16px; border-top: 1px solid var(--border-color); color: var(--danger) }
        .logout-btn:hover { background: #fee2e2; color: var(--danger) }
        .hero { max-width: 1400px; margin: 16px auto; padding: 0 16px }
        .hero-content { background: var(--gradient-primary); border-radius: var(--border-radius-2xl); padding: 24px 16px; box-shadow: var(--shadow-lg); text-align: center; color: #fff }
        .hero h2 { font-size: 20px; font-weight: 700; margin-bottom: 8px }
        .hero p { font-size: 12px; opacity: .9; margin-bottom: 20px }
        .hero-stats { display: flex; justify-content: center; gap: 24px; flex-wrap: wrap }
        .hero-stat-value { font-size: 20px; font-weight: 700 }
        .hero-stat-label { font-size: 11px }
        .search-section { max-width: 1400px; margin: 0 auto 16px; padding: 0 16px }
        .search-container { background: var(--bg-card); border-radius: var(--border-radius-full); padding: 4px 4px 4px 16px; display: flex; align-items: center; gap: 8px; border: 1px solid var(--border-color) }
        .search-container input { flex: 1; padding: 10px 0; border: none; outline: none; font-size: 13px; background: transparent; color: var(--text-primary) }
        .search-container input::placeholder { color: var(--text-muted); font-size: 12px }
        .search-container button { background: var(--gradient-primary); border: none; color: #fff; padding: 8px 18px; border-radius: var(--border-radius-full); cursor: pointer; font-weight: 500; font-size: 12px; white-space: nowrap }
        .products-section { max-width: 1400px; margin: 0 auto 40px; padding: 0 16px }
        .section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; background: var(--bg-card); padding: 10px 16px; border-radius: var(--border-radius-full); box-shadow: var(--shadow); border: 1px solid var(--border-color) }
        .section-title { font-size: 18px; font-weight: 700; background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent }
        .products-count { background: var(--gradient-primary); padding: 4px 12px; border-radius: var(--border-radius-full); color: #fff; font-weight: 600; font-size: 12px }
        .products-grid { display: grid; grid-template-columns: 1fr; gap: 16px }
        .product-card { background: var(--bg-card); border-radius: var(--border-radius-2xl); overflow: hidden; transition: all .3s; cursor: pointer; border: 1px solid var(--border-color); box-shadow: var(--shadow) }
        .product-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--primary) }
        .product-image { height: 180px; background: linear-gradient(135deg,#f5f0ff,#e9e4ff); position: relative; overflow: hidden }
        .product-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s }
        .product-card:hover .product-image img { transform: scale(1.03) }
        .product-badge { position: absolute; top: 10px; right: 10px; background: var(--danger); color: #fff; padding: 3px 8px; border-radius: var(--border-radius-full); font-size: 10px; font-weight: 600; z-index: 10 }
        .product-info { padding: 14px }
        .product-category { font-size: 10px; color: var(--primary); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 6px; display: flex; align-items: center; gap: 4px }
        .product-title { font-size: 15px; font-weight: 600; margin-bottom: 8px; color: var(--text-primary); line-height: 1.3 }
        .product-price { display: flex; align-items: center; gap: 6px; margin-bottom: 10px; flex-wrap: wrap }
        .current-price { font-size: 18px; font-weight: 700; color: var(--primary) }
        .old-price { font-size: 12px; color: var(--text-muted); text-decoration: line-through }
        .product-stock { display: flex; align-items: center; gap: 6px; padding: 8px 0; border-top: 1px dashed var(--border-color); border-bottom: 1px dashed var(--border-color); margin-bottom: 10px; font-size: 12px; color: var(--text-secondary) }
        .stock-indicator { width: 8px; height: 8px; border-radius: 50%; background: var(--success) }
        .stock-indicator.low { background: var(--warning); animation: pulse 1.5s infinite }
        .stock-indicator.out { background: var(--danger) }
        .product-views { font-size: 11px; color: var(--text-muted); margin-bottom: 10px; display: flex; align-items: center; gap: 4px }
        @keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(245,158,11,0.7); } 70% { box-shadow: 0 0 0 6px rgba(245,158,11,0); } 100% { box-shadow: 0 0 0 0 rgba(245,158,11,0); } }
        .add-to-cart { width: 100%; padding: 10px; background: var(--gradient-primary); border: none; border-radius: var(--border-radius); color: #fff; font-weight: 600; cursor: pointer; transition: all .3s; font-size: 13px }
        .add-to-cart:hover:not(:disabled) { transform: translateY(-1px); box-shadow: var(--shadow) }
        .add-to-cart:disabled { opacity: .5; cursor: not-allowed }
        .footer { background: var(--bg-card); border-top: 2px solid var(--border-color); padding: 30px 16px 16px; margin-top: 30px }
        .footer-content { max-width: 1400px; margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fit,minmax(150px,1fr)); gap: 24px }
        .footer-col h4 { font-size: 14px; margin-bottom: 12px; color: var(--text-primary) }
        .footer-col ul { list-style: none }
        .footer-col ul li { margin-bottom: 8px; font-size: 12px }
        .footer-col ul li a { color: var(--text-muted); text-decoration: none }
        .footer-col ul li a:hover { color: var(--primary) }
        .footer-bottom { text-align: center; margin-top: 24px; padding-top: 12px; border-top: 1px solid var(--border-color); font-size: 11px; color: var(--text-muted) }
        .modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,.5); backdrop-filter: blur(8px); display: flex; justify-content: center; align-items: center; z-index: 1000; opacity: 0; pointer-events: none; transition: opacity .3s }
        .modal.active { opacity: 1; pointer-events: all }
        .modal-content { background: var(--bg-card); border-radius: var(--border-radius-2xl); padding: 20px; width: 90%; max-width: 450px; max-height: 85vh; overflow-y: auto; color: var(--text-primary); border: 1px solid var(--border-color) }
        .modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--border-color) }
        .modal-header h2 { font-size: 18px }
        .modal-close { font-size: 24px; cursor: pointer; color: var(--text-secondary); line-height: 1 }
        .modal-close:hover { color: var(--danger) }
        .cart-item { display: flex; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--border-color) }
        .cart-item img { width: 60px; height: 60px; object-fit: cover; border-radius: var(--border-radius) }
        .cart-item-actions { display: flex; gap: 8px; align-items: center; margin-top: 8px; flex-wrap: wrap }
        .quantity-btn { width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--border-color); background: var(--bg-card); cursor: pointer; color: var(--text-primary); font-size: 14px }
        .cart-total { text-align: right; font-weight: 700; font-size: 16px; margin-top: 12px; padding-top: 12px; border-top: 2px solid var(--border-color) }
        .form-group { margin-bottom: 12px }
        .form-group label { display: block; margin-bottom: 4px; font-weight: 600; font-size: 13px; color: var(--text-secondary) }
        .form-control { width: 100%; padding: 10px; border: 2px solid var(--border-color); border-radius: var(--border-radius); outline: none; font-size: 13px; background: var(--bg-card); color: var(--text-primary) }
        .form-control:focus { border-color: var(--primary) }
        .empty-state { text-align: center; padding: 30px 16px; color: var(--text-muted) }
        .notification { position: fixed; top: 70px; right: 16px; background: var(--bg-card); padding: 10px 16px; border-radius: var(--border-radius-full); box-shadow: var(--shadow-lg); z-index: 2000; transform: translateX(120%); transition: transform .3s; font-size: 13px; color: var(--text-primary); border: 1px solid var(--border-color) }
        .notification.show { transform: translateX(0) }
        .checkout-summary { background: var(--gray-100); padding: 12px; border-radius: var(--border-radius); margin-bottom: 16px; font-size: 13px }
        .order-card { background: var(--gray-100); border-radius: var(--border-radius); padding: 12px; margin-bottom: 12px; border-left: 4px solid var(--primary); font-size: 13px }
        .order-status { display: inline-block; padding: 3px 10px; border-radius: var(--border-radius-full); font-size: 11px; font-weight: 600 }
        .status-pending { background: var(--warning); color: #fff }
        .status-processing { background: var(--primary); color: #fff }
        .status-delivered { background: var(--success); color: #fff }
        .status-cancelled { background: var(--danger); color: #fff }
        .promo-section { background: linear-gradient(135deg,#fef3c7,#fde68a); padding: 12px; border-radius: var(--border-radius-lg); margin-bottom: 16px; color: #334155 }
        .promo-input-group { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap }
        .promo-input-group input { flex: 1; padding: 10px; border: 2px solid var(--gray-200); border-radius: var(--border-radius); font-size: 13px; text-transform: uppercase; min-width: 120px }
        .promo-input-group button { padding: 10px 16px; background: var(--gradient-success); border: none; border-radius: var(--border-radius); color: #fff; font-weight: 600; cursor: pointer; font-size: 13px }
        .discount-info { margin-top: 8px; padding: 8px; background: #fff; border-radius: var(--border-radius); text-align: center; font-weight: 600; font-size: 12px }
        @media (min-width: 640px) { .products-grid { grid-template-columns: repeat(2,1fr); gap: 20px } .hero h2 { font-size: 24px } .hero-stat-value { font-size: 24px } .section-title { font-size: 22px } }
        @media (min-width: 1024px) { .products-grid { grid-template-columns: repeat(3,1fr); gap: 24px } .hero-content { padding: 40px 20px } .hero h2 { font-size: 28px } .section-title { font-size: 24px } }
        @media (min-width: 1280px) { .products-grid { grid-template-columns: repeat(4,1fr) } }