.sale_smartly_note{
        position: fixed;
        right: 5px;
        bottom: 1px;
        text-align: center;
        font-size: 12px;
        color: #333;
        background-color: #fff;
        padding: 5px 10px;
        border-radius: 5px;
        box-shadow: 0 0 10px rgba(0,0,0,0.1);
        z-index: 9999;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    /* 显示状态 */
    .sale_smartly_note.show {
        opacity: 1;
        visibility: visible;
    }
    /* 上方箭头 */
    .sale_smartly_note::before {
        content: '';
        position: absolute;
        top: -4px;
        right: 36px;
        width: 0;
        height: 0;
        border-left: 5px solid transparent;
        border-right: 8px solid transparent;
        border-bottom: 10px solid #fff;
        filter: drop-shadow(0 -2px 2px rgba(0,0,0,0.05));
    }