* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        :root {
            --primary-color: #d4a762;
            --secondary-color: #b8860b;
            --dark-color: #333;
            --light-color: #f8f8f8;
            --danger-color: #dc3545;
            --success-color: #28a745;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --border-radius: 10px;
        }

        body {
            background-color: #f5f5f5;
            color: var(--dark-color);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
        }

        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px;
            background-color: var(--dark-color);
            color: white;
            border-radius: var(--border-radius);
            margin-bottom: 30px;
            box-shadow: var(--shadow);
            flex-wrap: wrap;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .logo i {
            color: var(--primary-color);
            font-size: 2.5rem;
        }

        .logo h1 {
            font-size: 1.8rem;
            font-weight: 700;
        }

        .mode-selector {
            display: flex;
            gap: 10px;
        }

        .mode-btn {
            padding: 10px 20px;
            border-radius: 30px;
            border: none;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .admin-btn {
            background-color: var(--primary-color);
            color: var(--dark-color);
        }

        .customer-btn {
            background-color: transparent;
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
        }

        .mode-btn:hover, .mode-btn.active {
            background-color: var(--primary-color);
            color: var(--dark-color);
            transform: translateY(-2px);
        }

        .customer-btn.active {
            background-color: var(--primary-color);
            color: var(--dark-color);
        }

        /* Main App Sections */
        .app-section {
            display: none;
            animation: fadeIn 0.5s ease;
        }

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

        .app-section.active {
            display: block;
        }

        /* Admin Panel Styles */
        .admin-panel {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: var(--shadow);
        }

        .panel-title {
            font-size: 1.8rem;
            margin-bottom: 25px;
            color: var(--dark-color);
            border-bottom: 2px solid var(--primary-color);
            padding-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .panel-title i {
            color: var(--primary-color);
        }

        .form-container {
            background-color: #f9f9f9;
            padding: 20px;
            border-radius: var(--border-radius);
            margin-bottom: 30px;
        }

        .form-row {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 20px;
            margin-bottom: 20px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
        }

        .form-group label {
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark-color);
        }

        .form-group input, .form-group select {
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }

        .form-group input:focus {
            border-color: var(--primary-color);
            outline: none;
        }

        .btn {
            padding: 12px 25px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
            font-size: 1rem;
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: var(--dark-color);
        }

        .btn-primary:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
        }

        .btn-danger {
            background-color: var(--danger-color);
            color: white;
        }

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

        /* Items Table */
        .items-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
            box-shadow: var(--shadow);
            border-radius: var(--border-radius);
            overflow: hidden;
        }

        .items-table th {
            background-color: var(--dark-color);
            color: white;
            text-align: left;
            padding: 15px;
        }

        .items-table td {
            padding: 15px;
            border-bottom: 1px solid #eee;
        }

        .items-table tr:nth-child(even) {
            background-color: #f9f9f9;
        }

        .items-table tr:hover {
            background-color: #f0f0f0;
        }

        .action-btn {
            padding: 8px 12px;
            margin-right: 5px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.9rem;
        }

    
        .customer-panel {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: var(--shadow);
        }
        
        .items-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
            margin-bottom: 30px;
        }

        @media (min-width: 768px) {
            .items-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 20px;
            }
        }

        @media (min-width: 1200px) {
            .items-grid {
                grid-template-columns: repeat(6, 1fr);
                gap: 15px;
            }
        }

        .item-card {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 15px;
            box-shadow: var(--shadow);
            border: 1px solid #eee;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .item-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }

        .item-card h3 {
            font-size: 1.1rem;
            margin-bottom: 8px;
            color: var(--dark-color);
            line-height: 1.3;
            min-height: 2.6em;
        }

        @media (min-width: 768px) {
            .item-card h3 {
                font-size: 1.2rem;
            }
        }

        .item-card .price {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 10px;
        }

        .item-card .default-qty {
            font-size: 0.9rem;
            color: #666;
            margin-bottom: 10px;
            background-color: #f8f8f8;
            padding: 5px 10px;
            border-radius: 5px;
            display: inline-block;
        }

        .checkbox-group {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-top: auto;
        }

        .checkbox-group input[type="checkbox"] {
            width: 20px;
            height: 20px;
            accent-color: var(--primary-color);
            flex-shrink: 0;
        }

        .checkbox-group label {
            cursor: pointer;
            font-weight: 600;
            color: var(--dark-color);
        }

        .quantity-display {
            margin-top: 10px;
            padding: 8px;
            background-color: #f0f0f0;
            border-radius: 5px;
            font-weight: 600;
            text-align: center;
            display: none;
        }

        .quantity-display.show {
            display: block;
        }

        
        .prompt-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            z-index: 1100;
            justify-content: center;
            align-items: center;
            animation: fadeIn 0.3s ease;
        }

        .prompt-modal.active {
            display: flex;
        }

        .prompt-content {
            background-color: white;
            width: 90%;
            max-width: 400px;
            border-radius: var(--border-radius);
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            position: relative;
        }

        .prompt-header {
            margin-bottom: 20px;
            text-align: center;
        }

        .prompt-header h3 {
            color: var(--dark-color);
            margin-bottom: 5px;
        }

        .prompt-body {
            margin-bottom: 25px;
        }

        .prompt-body p {
            margin-bottom: 15px;
            font-size: 1.1rem;
        }

        .prompt-input {
            width: 100%;
            padding: 12px;
            border: 2px solid var(--primary-color);
            border-radius: 5px;
            font-size: 1.1rem;
            text-align: center;
            font-weight: 600;
        }

        .prompt-actions {
            display: flex;
            gap: 15px;
        }

        .prompt-actions button {
            flex: 1;
        }

        
        .bill-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            z-index: 1000;
            justify-content: center;
            align-items: center;
            animation: fadeIn 0.3s ease;
        }

        .bill-modal.active {
            display: flex;
        }

        .bill-content {
            background-color: white;
            width: 90%;
            max-width: 700px;
            border-radius: var(--border-radius);
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            position: relative;
            max-height: 90vh;
            overflow-y: auto;
        }

        .close-modal {
            position: absolute;
            top: 15px;
            right: 20px;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--dark-color);
        }

        .bill-header {
            text-align: center;
            margin-bottom: 25px;
            border-bottom: 2px solid var(--primary-color);
            padding-bottom: 15px;
        }

        .bill-header h2 {
            color: var(--dark-color);
            margin-bottom: 5px;
        }

        .bill-details {
            margin-bottom: 25px;
        }

        .bill-table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 25px;
        }

        .bill-table th, .bill-table td {
            padding: 12px 15px;
            text-align: left;
            border-bottom: 1px solid #eee;
        }

        .bill-table th {
            background-color: #f8f8f8;
            font-weight: 600;
        }

        .total-section {
            background-color: #f8f8f8;
            padding: 20px;
            border-radius: var(--border-radius);
            margin-top: 20px;
            font-size: 1.3rem;
            font-weight: 700;
            text-align: right;
            color: var(--dark-color);
        }

        .bill-actions {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 30px;
        }

        
        .sales-dashboard {
            margin-top: 30px;
        }

        .sales-stats {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .stat-card {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: var(--shadow);
            text-align: center;
        }

        .stat-card h3 {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--dark-color);
        }

        .stat-card .stat-value {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
        }

     
        footer {
            text-align: center;
            margin-top: 40px;
            padding: 20px;
            color: #666;
            font-size: 0.9rem;
        }

        /* Responsive Design */
        @media (max-width: 767px) {
            .form-row {
                grid-template-columns: 1fr;
            }
            
            .sales-stats {
                grid-template-columns: 1fr;
            }
            
            .bill-actions {
                flex-direction: column;
            }
            
            .mode-selector {
                flex-direction: column;
                width: 100%;
                margin-top: 15px;
            }
            
            .mode-btn {
                width: 100%;
            }
            
            header {
                flex-direction: column;
                gap: 15px;
                text-align: center;
            }
            
            .items-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .prompt-actions {
                flex-direction: column;
            }
        }

        @media (max-width: 480px) {
            .items-grid {
                grid-template-columns: 1fr;
            }
        }