ul.variable-items-wrapper[data-attribute_name="attribute_pa_size"]:not(.size-loaded) {
                opacity: 0 !important;
                visibility: hidden !important;
                min-height: 0;
                overflow: hidden;
                pointer-events: none;
            }

            ul.variable-items-wrapper[data-attribute_name="attribute_pa_size"].size-loaded {
                opacity: 1 !important;
                visibility: visible !important;
                min-height: 0;
                pointer-events: auto;
                transition: opacity 0.2s ease-in;
            }

            table.variations tbody, table.variations tr {
                display: flex;
                flex-direction: column;
                width: 100%;
            }

            table.variations td.value {
                display: block;
                width: 100%;
                padding: 0;
                margin-top: 5px;
            }

            table.variations td.label {
                position: absolute;
                left: -9999px;
                opacity: 0;
                width: 0;
                height: 0;
                overflow: hidden;
            }

            .custom-label-title {
                font-size: 13px;
                font-weight: 700;
                color: #111;
                text-transform: uppercase;
                margin-bottom: 8px;
                display: block;
                line-height: 1.2;
                font-family: inherit;
            }

            .custom-label-title .required {
                color: #d93025;
                margin-left: 3px;
            }

            .custom-size-tabs-container {
/*                 margin-bottom: 20px; */
            }

            .custom-size-tabs {
                display: flex;
                gap: 10px;
                flex-wrap: wrap;
            }

            .custom-size-tab {
                width: calc((100% - (3 * 10px)) / 4);
                min-width: 70px;
                border: 1px solid #e5e5e5;
                background-color: #fff;
                color: #111;
                padding: 10px 20px;
                font-size: 14px;
                font-weight: 500;
                cursor: pointer;
                text-align: center;
                transition: all 0.2s ease;
                display: flex;
                align-items: center;
                justify-content: center;
            }

            .custom-size-tab:hover {
                border-color: #bbb;
            }

            .custom-size-tab.active {
                background: #343a40 !important;
                background-image: none !important;
                color: #fff !important;
                border-color: #343a40 !important;
                font-weight: 600 !important;
                box-shadow: none !important;
            }

            ul.variable-items-wrapper {
                display: grid !important;
                grid-template-columns: repeat(5, 1fr);
                gap: 10px;
                justify-content: start;
            }

            @media (max-width: 768px) {
                ul.variable-items-wrapper {
                    grid-template-columns: repeat(5, 1fr);
                }
            }

            .variable-item.button-variable-item {
                width: 100% !important;
                min-width: auto !important;
                margin: 0 !important;
                height: auto !important;
                min-height: 45px;
                border: 1px solid #e5e5e5;
                border-radius: 2px !important;
                background-color: #fff;
                display: flex;
                align-items: center;
                justify-content: center;
                box-shadow: none !important;
            }

            .variable-item.button-variable-item:hover {
                border-color: #999;
            }

            .variable-item.button-variable-item.selected {
                background: #343a40 !important;
                background-image: none !important;
                color: #fff !important;
                border-color: #343a40 !important;
                font-weight: 600 !important;
                box-shadow: none !important;
            }

            .variable-item.button-variable-item.selected .variable-item-span-button {
                color: #fff !important;
                font-weight: 600 !important;
            }

            .variable-item-span-button {
                font-size: 13px;
                font-weight: 500;
                color: #111;
                padding: 5px;
            }

            /* ============================================================
         * Site A PDP PayPal 按钮兼容
         *  - 未选 size 时按钮置灰、保留 PayPal 黄；
         *  - swatch 渐显前按钮也跟随 dim，防止 0~50ms 误点。
         * ============================================================ */
            #sitea-pdp-quick-paypal-btn[data-size-required="1"], #sitea-pdp-quick-paypal-btn[data-size-required="1"]:hover, #sitea-pdp-quick-paypal-btn[data-size-required="1"]:focus {
                background: #ffc439 !important;
                background-image: none !important;
                color: #111 !important;
                border: 1px solid #ffc439 !important;
                opacity: 0.55 !important;
                cursor: not-allowed !important;
                box-shadow: none !important;
            }

            body.single-product:has( ul.variable-items-wrapper[data-attribute_name="attribute_pa_size"]:not(.size-loaded) ) #sitea-pdp-quick-paypal-btn {
                opacity: 0.55;
                pointer-events: none;
            }