    <style>
        /* Reset */
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Arial', sans-serif;
        }

        body {
            background: #f9fafb;
            color: #1f2937;
        }

        /* Container */
        .container {
            max-width: 800px;
            margin: 2rem auto;
            padding: 1rem;
        }

        /* Card */
        .card {
            background: #fff;
            border-radius: 16px;
            padding: 2rem;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
        }

        /* Header */
        h1 {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        p {
            font-size: 0.85rem;
            color: #6b7280;
            margin-bottom: 0.5rem;
        }

        /* Inputs */
        input,
        textarea {
            width: 100%;
            padding: 0.4rem 0.6rem;
            margin-top: 0.2rem;
            margin-bottom: 0.5rem;
            border: 1px solid #e5e7eb;
            border-radius: 8px;
            font-size: 0.85rem;
            transition: border-color 0.2s, box-shadow 0.2s;
        }

        input:focus,
        textarea:focus {
            border-color: #4f46e5;
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
            outline: none;
        }

        /* Buttons */
        button {
            cursor: pointer;
            border: none;
            border-radius: 10px;
            font-size: 0.95rem;
            font-weight: 600;
            transition: all 0.2s ease;
        }

        .btn-primary {
            background: linear-gradient(90deg, #4f46e5, #6366f1);
            color: #fff;
            box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
            padding: 0.65rem 1rem;
        }

        .btn-primary:hover {
            background: linear-gradient(90deg, #6366f1, #4f46e5);
            box-shadow: 0 6px 18px rgba(79, 70, 229, 0.4);
        }

        .btn-secondary {
            background: linear-gradient(90deg, #22c55e, #16a34a);
            color: #fff;
            padding: 0.65rem 1rem;
        }

        .btn-secondary:hover {
            background: linear-gradient(90deg, #16a34a, #22c55e);
        }

        /* Progress Bar */
        .progress {
            display: flex;
            gap: 0.25rem;
            margin: 1rem 0;
        }

        .progress div {
            flex: 1;
            height: 6px;
            border-radius: 4px;
            background: #e5e7eb;
        }

        .progress .active {
            background: #4f46e5;
        }

        /* Flex Helpers */
        .flex {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .flex-col {
            display: flex;
            flex-direction: column;
        }

        .justify-between {
            justify-content: space-between;
        }

        .text-center {
            text-align: center;
        }

        /* Product & Quantity */
        .product-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 1rem;
        }

        .product-row img {
            width: 100px;
            height: 100px;
            object-fit: cover;
            border-radius: 8px;
            margin-right: 0.5rem;
        }

        .product-info {
            flex: 1;
            margin-right: 0.5rem;
        }

        .product-info p:first-child {
            font-weight: 600;
            font-size: 0.95rem;
        }

        .product-info p:last-child {
            font-size: 0.8rem;
            color: #6b7280;
            margin-top: 2px;
        }

        .quantity {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .quantity button {
            padding: 0.25rem 0.5rem;
            border: 1px solid #e5e7eb;
            background: #fff;
            border-radius: 6px;
        }

        /* Summary */
        .summary {
            border-top: 1px solid #e5e7eb;
            padding-top: 0.75rem;
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }

        .summary .flex {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.25rem;
            font-weight: 500;
        }

        .summary .total {
            font-size: 1rem;
            font-weight: 700;
            margin-top: 0.25rem;
        }

        /* Customer Details Box */
        .customer-details {
            border: 1px solid #d1d5db;
            border-radius: 10px;
            padding: 1rem;
            margin-top: 1rem;
        }

        .customer-details h2 {
            font-size: 1rem;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }

        /* Grid for two columns */
        .details-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 0.5rem;
        }

        @media(min-width: 640px) {
            .details-grid {
                grid-template-columns: 1fr 1fr;
                gap: 0.75rem;
            }
        }

        /* Step 2 & 3 */
        .hidden {
            display: none;
        }

        .step3 h2 {
            color: #22c55e;
            margin-bottom: 0.5rem;
            font-size: 1.3rem;
            font-weight: 700;
        }

        .step3 p {
            color: #374151;
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }

        html,
        body {
            max-width: 100%;
            overflow-x: hidden;
        }

        #page-content {
            max-width: 100%;
            box-sizing: border-box;
            overflow-wrap: anywhere;
            word-break: normal;
            white-space: normal;
        }

        #page-content * {
            max-width: 100%;
            box-sizing: border-box;
            overflow-wrap: anywhere;
            word-break: normal;
            white-space: normal;
        }

        #page-content img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        .product-row {
            flex-wrap: wrap;
            /* allow wrapping on mobile */
        }

        .product-info p:first-child,
        .product-info p:last-child {
            word-break: normal;
            overflow-wrap: anywhere;
        }
    </style>
