* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary-color: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --secondary-color: #64748b;
            --accent-color: #f59e0b;
            --success-color: #10b981;
            --danger-color: #ef4444;
            --warning-color: #f59e0b;
            --background-primary: #ffffff;
            --background-secondary: #f8fafc;
            --background-tertiary: #f1f5f9;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --border-medium: #cbd5e1;
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
            --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
            --radius-sm: 0.375rem;
            --radius-md: 0.5rem;
            --radius-lg: 0.75rem;
            --radius-xl: 1rem;
        }

        body {
            font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
            color: var(--text-primary);
            min-height: 100vh;
            line-height: 1.6;
            font-feature-settings: "cv02", "cv03", "cv04", "cv11";
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 2rem 1rem;
        }

        .page-number {
            position: absolute;
            top: 1.5rem;
            right: 1.5rem;
            background: var(--primary-color);
            color: white;
            padding: 0.75rem 1rem;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.875rem;
            box-shadow: var(--shadow-md);
            backdrop-filter: blur(10px);
        }

        .header {
            text-align: center;
            margin-bottom: 3rem;
            background: var(--background-primary);
            padding: 3rem 2rem;
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-light);
            position: relative;
            overflow: hidden;
        }

        .header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
        }

        .header h1 {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 1rem;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -0.025em;
        }

        .header p {
            font-size: 1.125rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        .filters-section {
            background: var(--background-primary);
            padding: 2rem;
            border-radius: var(--radius-lg);
            margin-bottom: 2rem;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .filters-section:hover {
            box-shadow: var(--shadow-lg);
        }

        .filters-grid {
            display: grid;
            grid-template-columns: 1fr 1fr auto;
            gap: 1.5rem;
            align-items: end;
        }

        /* Categories Section */
        .categories-section {
            background: var(--background-primary);
            padding: 1.5rem 2rem;
            border-radius: var(--radius-lg);
            margin-bottom: 2rem;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .categories-section:hover {
            box-shadow: var(--shadow-lg);
        }

        .categories-nav {
            display: flex;
            gap: 0.75rem;
            flex-wrap: wrap;
        }

        .category-btn {
            padding: 0.75rem 1.5rem;
            border: 1px solid var(--border-medium);
            background: var(--background-secondary);
            border-radius: 9999px;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.875rem;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            color: var(--text-secondary);
            position: relative;
            overflow: hidden;
        }

        .category-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
            transition: left 0.5s;
        }

        .category-btn:hover::before {
            left: 100%;
        }

        .category-btn:hover {
            border-color: var(--primary-color);
            color: var(--primary-color);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .category-btn.active {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            box-shadow: var(--shadow-md);
        }

        .category-btn.active:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
        }

        .filter-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .filter-label {
            font-weight: 600;
            font-size: 0.875rem;
            color: var(--text-primary);
            margin-bottom: 0.5rem;
        }

        .filter-input, .filter-select {
            padding: 0.875rem 1rem;
            border: 1px solid var(--border-medium);
            border-radius: var(--radius-md);
            font-size: 0.875rem;
            background: var(--background-primary);
            color: var(--text-primary);
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-sm);
        }

        .filter-input:focus, .filter-select:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }

        .add-button {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            color: white;
            border: none;
            padding: 0.875rem 2rem;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.875rem;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-md);
            position: relative;
            overflow: hidden;
        }

        .add-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.5s;
        }

        .add-button:hover::before {
            left: 100%;
        }

        .add-button:hover {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .add-button:active {
            transform: translateY(0);
        }

        .results-info {
            color: var(--text-muted);
            margin-bottom: 1.5rem;
            font-weight: 500;
            font-size: 0.875rem;
        }

        .products-container {
            background: var(--background-primary);
            border-radius: var(--radius-lg);
            padding: 2rem;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .products-container:hover {
            box-shadow: var(--shadow-lg);
        }

        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 2rem;
        }

        .product-card {
            background: var(--background-primary);
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            box-shadow: var(--shadow-md);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
            height: 480px;
            position: relative;
            overflow: hidden;
        }

        .product-card:hover {
            box-shadow: var(--shadow-xl);
            transform: translateY(-4px);
            border-color: var(--primary-color);
        }

        .product-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .product-card:hover::before {
            transform: scaleX(1);
        }

        .product-image {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-radius: var(--radius-md);
            margin-bottom: 1rem;
            background: var(--background-tertiary);
            flex-shrink: 0;
            border: 1px solid var(--border-light);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .product-card:hover .product-image {
            transform: scale(1.02);
        }

        .product-content {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
            min-height: 0;
        }

        .product-info {
            flex: 1;
            min-height: 0;
            overflow: hidden;
        }

        .product-name {
            font-size: 1.125rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--text-primary);
            line-height: 1.3;
            letter-spacing: -0.025em;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .product-type {
            background: linear-gradient(135deg, var(--background-secondary) 0%, var(--background-tertiary) 100%);
            color: var(--text-secondary);
            padding: 0.375rem 0.75rem;
            border-radius: 9999px;
            font-size: 0.75rem;
            display: inline-block;
            margin-bottom: 0.75rem;
            border: 1px solid var(--border-light);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .product-description {
            color: var(--text-secondary);
            margin-bottom: 0.75rem;
            font-size: 0.875rem;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .product-price {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
            letter-spacing: -0.025em;
        }

        .product-quantity {
            color: var(--text-muted);
            font-size: 0.875rem;
            margin-bottom: 0.75rem;
            font-weight: 500;
        }

        .product-actions {
            display: flex;
            gap: 0.5rem;
            margin-top: auto;
            padding-top: 0.75rem;
            flex-shrink: 0;
            width: 100%;
            box-sizing: border-box;
        }

        .edit-btn, .delete-btn, .toggle-btn {
            flex: 1;
            padding: 0.5rem 0.75rem;
            border: none;
            border-radius: var(--radius-md);
            cursor: pointer;
            font-weight: 600;
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.025em;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            white-space: nowrap;
            text-overflow: ellipsis;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            min-width: 0;
            max-width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-sizing: border-box;
        }

        .edit-btn {
            background: var(--background-secondary);
            color: var(--text-secondary);
            border: 1px solid var(--border-medium);
        }

        .edit-btn:hover {
            background: var(--background-tertiary);
            color: var(--text-primary);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .delete-btn {
            background: var(--danger-color);
            color: white;
            border: 1px solid var(--danger-color);
        }

        .delete-btn:hover {
            background: #dc2626;
            border-color: #dc2626;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .toggle-btn {
            border: 1px solid var(--border-medium);
            background: var(--background-secondary);
            color: var(--text-secondary);
        }

        .toggle-btn.active {
            background: var(--success-color);
            color: white;
            border-color: var(--success-color);
        }

        .toggle-btn.active:hover {
            background: #059669;
            border-color: #059669;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .toggle-btn.inactive {
            background: var(--secondary-color);
            color: white;
            border-color: var(--secondary-color);
        }

        .toggle-btn.inactive:hover {
            background: #475569;
            border-color: #475569;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .status-indicator {
            display: inline-block;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            margin-right: 0.5rem;
        }

        .status-active {
            background-color: var(--success-color);
        }

        .status-inactive {
            background-color: var(--secondary-color);
        }

        /* Login Modal Styles */
        .login-modal {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(15, 23, 42, 0.8);
            backdrop-filter: blur(8px);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }

        .login-form {
            background: var(--background-primary);
            padding: 3rem;
            border-radius: var(--radius-xl);
            width: 90%;
            max-width: 400px;
            box-shadow: var(--shadow-xl);
            border: 1px solid var(--border-light);
            position: relative;
            overflow: hidden;
        }

        .login-form::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
        }

        .login-title {
            text-align: center;
            margin-bottom: 2rem;
            color: var(--text-primary);
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.025em;
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--text-primary);
            font-size: 0.875rem;
        }

        .form-input {
            width: 100%;
            padding: 0.875rem 1rem;
            border: 1px solid var(--border-medium);
            border-radius: var(--radius-md);
            font-size: 1rem;
            background: var(--background-primary);
            color: var(--text-primary);
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-sm);
        }

        .form-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }

        .login-btn {
            width: 100%;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            color: white;
            border: none;
            padding: 1rem;
            border-radius: var(--radius-md);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-md);
            position: relative;
            overflow: hidden;
        }

        .login-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.5s;
        }

        .login-btn:hover::before {
            left: 100%;
        }

        .login-btn:hover {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
            transform: translateY(-1px);
            box-shadow: var(--shadow-lg);
        }

        .error-message {
            color: var(--danger-color);
            text-align: center;
            margin-top: 1rem;
            font-size: 0.875rem;
            font-weight: 500;
        }

        /* Modal Styles */
        .modal {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(15, 23, 42, 0.8);
            backdrop-filter: blur(8px);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }

        .modal.hidden {
            display: none;
        }

        .modal-content {
            background: var(--background-primary);
            padding: 2rem;
            border-radius: var(--radius-xl);
            width: 90%;
            max-width: 600px;
            max-height: 90vh;
            overflow-y: auto;
            box-shadow: var(--shadow-xl);
            border: 1px solid var(--border-light);
            position: relative;
        }

        .modal-content::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--border-light);
        }

        .modal-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.025em;
        }

        .close-btn {
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--text-muted);
            padding: 0.5rem;
            border-radius: var(--radius-md);
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .close-btn:hover {
            color: var(--text-primary);
            background: var(--background-secondary);
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
        }

        .image-upload {
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 2rem;
            border: 2px dashed var(--border-medium);
            border-radius: var(--radius-lg);
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            background: var(--background-secondary);
        }

        .image-upload:hover {
            border-color: var(--primary-color);
            background: var(--background-tertiary);
            transform: translateY(-1px);
        }

        .image-type-selector {
            display: flex;
            margin-bottom: 1.5rem;
            border: 1px solid var(--border-medium);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }

        .image-type-btn {
            flex: 1;
            padding: 0.75rem 1rem;
            background: var(--background-secondary);
            border: none;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.875rem;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            color: var(--text-secondary);
        }

        .image-type-btn.active {
            background: var(--primary-color);
            color: white;
        }

        .image-type-btn:hover:not(.active) {
            background: var(--background-tertiary);
            color: var(--text-primary);
        }

        .image-url-container {
            display: flex;
            gap: 0.75rem;
            align-items: end;
        }

        .image-url-container input {
            flex: 1;
        }

        .preview-url-btn {
            background: var(--secondary-color);
            color: white;
            border: none;
            padding: 0.875rem 1rem;
            border-radius: var(--radius-md);
            cursor: pointer;
            font-weight: 600;
            font-size: 0.875rem;
            white-space: nowrap;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-sm);
        }

        .preview-url-btn:hover {
            background: #475569;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .type-input-container {
            display: flex;
            gap: 0.75rem;
            align-items: stretch;
        }

        .type-select {
            flex: 1;
        }

        .add-type-btn {
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 0.875rem 1rem;
            border-radius: var(--radius-md);
            cursor: pointer;
            font-weight: 600;
            font-size: 0.875rem;
            min-width: 44px;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-sm);
        }

        .add-type-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .custom-type-input {
            margin-top: 0.75rem;
        }

        .hidden {
            display: none !important;
        }

        .image-preview {
            width: 120px;
            height: 120px;
            object-fit: cover;
            border-radius: var(--radius-md);
            margin-bottom: 1rem;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }

        .upload-text {
            color: var(--text-muted);
            font-size: 0.875rem;
            text-align: center;
            font-weight: 500;
        }

        .hidden-input {
            display: none;
        }

        .save-btn {
            width: 100%;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            color: white;
            border: none;
            padding: 1rem;
            border-radius: var(--radius-md);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            margin-top: 2rem;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-md);
            position: relative;
            overflow: hidden;
        }

        .save-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.5s;
        }

        .save-btn:hover::before {
            left: 100%;
        }

        .save-btn:hover {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
            transform: translateY(-1px);
            box-shadow: var(--shadow-lg);
        }
        .user-info {
            display: flex;
            flex-direction: row;
            justify-content: space-between;
            align-items: center;
            gap: 1.5rem;
            margin-bottom: 2rem;
            padding: 1.25rem 2rem;
            background: var(--background-primary);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .user-info:hover {
            box-shadow: var(--shadow-lg);
        }
        
        .user-info h3 {
            margin: 0;
            color: var(--text-primary);
            font-weight: 700;
            font-size: 1.125rem;
        }

        .logout-btn {
            background: var(--secondary-color);
            color: white;
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: var(--radius-md);
            cursor: pointer;
            font-weight: 600;
            font-size: 0.875rem;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-sm);
        }

        .logout-btn:hover {
            background: #475569;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        /* Chat Notification Section Styles */
        .chat-notification-section {
            background: var(--background-primary);
            padding: 2rem;
            border-radius: var(--radius-lg);
            margin-bottom: 2rem;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
        }

        .chat-notification-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #f59e0b, #f97316);
        }

        .chat-notification-section:hover {
            box-shadow: var(--shadow-lg);
        }

        .notification-header {
            margin-bottom: 1.5rem;
            text-align: center;
        }

        .notification-header h3 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 0.5rem;
            letter-spacing: -0.025em;
        }

        .notification-header p {
            color: var(--text-secondary);
            font-size: 0.875rem;
            font-weight: 500;
        }

        .notification-form {
            max-width: 600px;
            margin: 0 auto;
        }

        .notification-input-group {
            margin-bottom: 1.5rem;
            position: relative;
        }

        .notification-textarea {
            width: 100%;
            padding: 1rem;
            border: 1px solid var(--border-medium);
            border-radius: var(--radius-md);
            font-size: 0.875rem;
            background: var(--background-primary);
            color: var(--text-primary);
            resize: vertical;
            min-height: 100px;
            font-family: inherit;
            line-height: 1.5;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-sm);
        }

        .notification-textarea:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
        }

        .notification-textarea::placeholder {
            color: var(--text-muted);
        }

        .char-counter {
            text-align: right;
            margin-top: 0.5rem;
            font-size: 0.75rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        .char-counter.warning {
            color: var(--warning-color);
        }

        .char-counter.danger {
            color: var(--danger-color);
        }

        .notification-actions {
            display: flex;
            gap: 1rem;
            justify-content: center;
            align-items: center;
        }

        .send-notification-btn {
            background: linear-gradient(135deg, var(--accent-color) 0%, #f97316 100%);
            color: white;
            border: none;
            padding: 0.875rem 2rem;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.875rem;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-md);
            position: relative;
            overflow: hidden;
            min-width: 160px;
            text-transform: uppercase;
            letter-spacing: 0.025em;
        }

        .send-notification-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.5s;
        }

        .send-notification-btn:hover::before {
            left: 100%;
        }

        .send-notification-btn:hover:not(:disabled) {
            background: linear-gradient(135deg, #f97316 0%, var(--accent-color) 100%);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .send-notification-btn:disabled {
            background: var(--secondary-color);
            cursor: not-allowed;
            transform: none;
            box-shadow: var(--shadow-sm);
        }

        .send-notification-btn:active:not(:disabled) {
            transform: translateY(0);
        }

        .clear-message-btn {
            background: var(--background-secondary);
            color: var(--text-secondary);
            border: 1px solid var(--border-medium);
            padding: 0.875rem 1.5rem;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.875rem;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-sm);
            text-transform: uppercase;
            letter-spacing: 0.025em;
        }

        .clear-message-btn:hover {
            background: var(--background-tertiary);
            color: var(--text-primary);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .notification-result {
            margin-top: 1.5rem;
            padding: 1rem;
            border-radius: var(--radius-md);
            font-size: 0.875rem;
            font-weight: 500;
            text-align: center;
            animation: slideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .notification-result.success {
            background: rgba(16, 185, 129, 0.1);
            color: var(--success-color);
            border: 1px solid rgba(16, 185, 129, 0.2);
        }

        .notification-result.error {
            background: rgba(239, 68, 68, 0.1);
            color: var(--danger-color);
            border: 1px solid rgba(239, 68, 68, 0.2);
        }

        .notification-result.info {
            background: rgba(37, 99, 235, 0.1);
            color: var(--primary-color);
            border: 1px solid rgba(37, 99, 235, 0.2);
        }

        .btn-loading {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }

        .btn-loading::after {
            content: '';
            width: 16px;
            height: 16px;
            border: 2px solid currentColor;
            border-radius: 50%;
            border-top-color: transparent;
            animation: spin 1s linear infinite;
        }

        @media (max-width: 768px) {
            .container {
                padding: 1rem;
            }

            .filters-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }

            .products-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }

            .form-row {
                grid-template-columns: 1fr;
            }
            
            .header {
                padding: 2rem 1.5rem;
                margin-bottom: 2rem;
            }
            
            .header h1 {
                font-size: 2.5rem;
            }

            .page-number {
                top: 1rem;
                right: 1rem;
                padding: 0.5rem 0.75rem;
                font-size: 0.75rem;
            }
            
            .categories-nav {
                justify-content: center;
                gap: 0.5rem;
            }
            
            .category-btn {
                font-size: 0.75rem;
                padding: 0.5rem 1rem;
            }
            
            .user-info {
                flex-direction: column;
                align-items: flex-start;
                gap: 1rem;
                padding: 1rem 1.5rem;
            }
            
            .modal-content {
                margin: 1rem;
                width: calc(100% - 2rem);
                padding: 1.5rem;
            }

            .filters-section,
            .categories-section,
            .products-container,
            .chat-notification-section {
                padding: 1.5rem;
            }

            .notification-actions {
                flex-direction: column;
                gap: 0.75rem;
                align-items: stretch;
            }

            .send-notification-btn,
            .clear-message-btn {
                width: 100%;
                justify-content: center;
            }

            .product-card {
                height: auto;
                min-height: 400px;
                padding: 1.25rem;
            }

            .product-actions {
                gap: 0.375rem;
                padding-top: 0.75rem;
                flex-wrap: nowrap;
            }

            .edit-btn, .delete-btn, .toggle-btn {
                padding: 0.5rem 0.5rem;
                font-size: 0.625rem;
                min-width: 0;
                flex: 1;
                max-width: calc(33.333% - 0.25rem);
            }
        }

        @media (max-width: 480px) {
            .header h1 {
                font-size: 2rem;
            }

            .header p {
                font-size: 1rem;
            }

            .products-grid {
                grid-template-columns: 1fr;
            }

            .modal-content {
                margin: 0.5rem;
                width: calc(100% - 1rem);
                max-height: 95vh;
            }

            .login-form {
                margin: 1rem;
                width: calc(100% - 2rem);
                padding: 2rem;
            }
        }

        /* Animaciones y transiciones mejoradas */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes slideInFromLeft {
            from {
                opacity: 0;
                transform: translateX(-20px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        @keyframes scaleIn {
            from {
                opacity: 0;
                transform: scale(0.9);
            }
            to {
                opacity: 1;
                transform: scale(1);
            }
        }

        @keyframes pulse {
            0%, 100% {
                transform: scale(1);
            }
            50% {
                transform: scale(1.05);
            }
        }

        .product-card {
            animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .product-card:nth-child(even) {
            animation-delay: 0.1s;
        }

        .product-card:nth-child(3n) {
            animation-delay: 0.2s;
        }

        .modal {
            animation: fadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .modal-content {
            animation: slideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .login-form {
            animation: scaleIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(-30px) scale(0.95);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        .categories-section {
            animation: slideInFromLeft 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .filters-section {
            animation: slideInFromLeft 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .products-container {
            animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .header {
            animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .user-info {
            animation: slideInFromLeft 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* Efectos adicionales de hover */
        .add-button:active,
        .login-btn:active,
        .save-btn:active {
            transform: scale(0.98);
        }

        .category-btn:active {
            transform: scale(0.95);
        }

        /* Smooth scrolling */
        html {
            scroll-behavior: smooth;
        }

        /* Custom scrollbar */
        ::-webkit-scrollbar {
            width: 8px;
        }

        ::-webkit-scrollbar-track {
            background: var(--background-secondary);
            border-radius: var(--radius-md);
        }

        ::-webkit-scrollbar-thumb {
            background: var(--border-medium);
            border-radius: var(--radius-md);
        }

        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

        /* Focus visible para accesibilidad */
        *:focus-visible {
            outline: 2px solid var(--primary-color);
            outline-offset: 2px;
        }

        /* Loading states */
        .loading {
            opacity: 0.6;
            pointer-events: none;
        }

        .loading::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 20px;
            height: 20px;
            margin: -10px 0 0 -10px;
            border: 2px solid var(--primary-color);
            border-radius: 50%;
            border-top-color: transparent;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }