/* 返回顶部 */
    .btn-back-to-top {
        padding: 0.5rem 1rem;
        position: fixed;
        right: 2rem;
        bottom: 1rem;
        z-index: 2;
        -webkit-transition: -webkit-transform 0.2s ease;
        transition: transform 0.2s ease;
        -webkit-transform: translateY(200%);
        transform: translateY(200%);
    }

    .btn-back-to-top.scrolled {
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }

    /** 图片列表*/
    @media screen and (min-width:960px) {
        .listNum img {
            width: 258px;
            height: 258px;
        }
    }

    @media screen and (max-width:960px) {
        .listNum img {
            width: 358px;
            height: 258px;
        }
    }

    .cards {
        padding-top: 0px;
        padding-bottom: 0px;
        margin-right: 0px;
        margin-left: 0px;
    }

    .card {
        box-shadow: rgba(0, 0, 0, 0.45) 0px 25px 20px -20px;
        border-radius: 5px 5px 5px 5px;
    }

    /* 广场图片选择: 选中高亮 */
    .card {
        position: relative;
    }

    .card.selected {
        box-shadow: 0 0 0 2px #3280fc, rgba(50, 128, 252, 0.6) 0px 0px 10px;
        border-radius: 5px 5px 5px 5px;
    }

    .card.selected::after {
        content: "\2713";
        position: absolute;
        top: 6px;
        right: 6px;
        z-index: 99;
        width: 24px;
        height: 24px;
        line-height: 24px;
        text-align: center;
        color: #fff;
        background-color: #3280fc;
        border-radius: 50%;
        font-size: 14px;
        font-weight: bold;
    }

    .card.selected .bottom-bar {
        opacity: 1;
    }

    /* 移动端无hover, 常显底部操作栏以便选择图片 */
    @media screen and (max-width:960px) {
        .bottom-bar {
            opacity: 1;
        }
    }

    img {
        cursor: pointer;
        transition: all 0.8s;
    }

    img:hover {
        transform: scale(1.5);
        position: relative;
        z-index: 100;
    }

    .bottom-bar {
        opacity: 0;
        width: 100%;
        position: absolute;
        bottom: 0.1px;
        background-color: rgba(0, 0, 0, 0.5);
    }

    .bottom-bar:hover {
        opacity: 1;
    }