* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Arial', sans-serif;
            background: white;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            max-width: 500px;
            margin: 0 auto;
            padding: 20px;
        }
        
        .logo {
            text-align: center;
            margin-bottom: 30px;
        }
        
        .logo img {
            max-width: 150px;
            height: auto;
        }
        
        .product-summary {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 12px;
            margin-bottom: 20px;
            border: 1px solid #e9ecef;
        }
        
        .product-item {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
            padding-bottom: 15px;
            border-bottom: 1px solid #dee2e6;
        }
        
        .product-item:last-child {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }
        
        .product-image {
            width: 60px;
            height: 60px;
            border-radius: 8px;
            margin-right: 15px;
            object-fit: cover;
        }
        
        .product-info {
            flex: 1;
        }
        
        .product-name {
            font-weight: 600;
            margin-bottom: 4px;
        }
        
        .product-price {
            color: #666;
            font-size: 14px;
        }
        
        .quantity-badge {
            background: #000;
            color: white;
            padding: 4px 8px;
            border-radius: 15px;
            font-size: 12px;
            margin-left: 10px;
        }
        
        .total-section {
            background: white;
            color: #000;
            border: 2px solid #000;
            padding: 20px;
            border-radius: 12px;
            text-align: center;
            margin-bottom: 20px;
        }
        
        .total-amount {
            font-size: 24px;
            font-weight: bold;
        }
        
        .buy-button {
            width: 100%;
            background: #000;
            color: white;
            border: none;
            padding: 18px;
            border-radius: 12px;
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-bottom: 20px;
        }
        
        .buy-button:hover {
            background: #333;
            transform: translateY(-2px);
        }
        
        .checkout-form {
            display: none;
            background: white;
            border: 1px solid #e9ecef;
            border-radius: 12px;
            padding: 25px;
            margin-top: 20px;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #333;
        }
        
        .form-input {
            width: 100%;
            padding: 12px;
            border: 2px solid #e9ecef;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s ease;
        }
        
        .form-input:focus {
            outline: none;
            border-color: #000;
        }
        
        .payment-options {
            margin: 25px 0;
        }
        
        .payment-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
            margin-bottom: 15px;
        }
        
        .payment-option {
            padding: 15px;
            border: 2px solid #e9ecef;
            border-radius: 8px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            background: white;
        }
        
        .payment-option:hover {
            border-color: #000;
        }
        
        .payment-option.selected {
            border-color: #000;
            background: #f8f9fa;
        }
        
        .payment-logo {
            height: 30px;
            margin-bottom: 8px;
        }
        
        .payment-name {
            font-weight: 600;
            font-size: 14px;
        }
        
        .bnpl-options {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
            margin-top: 15px;
        }
        
        .bnpl-option {
            padding: 12px;
            border: 2px solid #e9ecef;
            border-radius: 8px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            background: white;
        }
        
        .bnpl-option:hover {
            border-color: #000;
        }
        
        .bnpl-option.selected {
            border-color: #000;
            background: #f8f9fa;
        }
        
        .bnpl-logo {
            font-weight: bold;
            margin-bottom: 4px;
        }
        
        .bnpl-text {
            font-size: 12px;
            color: #666;
        }
        
        .tabby-logo { color: #00d4aa; }
        .tamara-logo { color: #333; }
        
        .confirm-button {
            width: 100%;
            background: #000;
            color: white;
            border: none;
            padding: 18px;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 20px;
        }
        
        .confirm-button:hover {
            background: #333;
        }
        
        .back-button {
            background: #6c757d;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 8px;
            cursor: pointer;
            margin-bottom: 20px;
        }
        
        .section-title {
            font-weight: 600;
            margin-bottom: 15px;
            color: #333;
        }
        
        @media (max-width: 480px) {
            .container {
                padding: 15px;
            }
            
            .payment-grid, .bnpl-options {
                grid-template-columns: 1fr;
            }
        }