.box {
    background-color: hsl(0,0%,97%);
    border-radius: 5px;
    margin: 1em 0;
    padding: .5em;
    box-shadow: 0 5px 10px rgba(0,0,0,.4);
}

.box-tip {
    min-width: 100px;
    z-index: 1;
    text-align: center;
}

.box-danger {
    background-color: #faa;
}

.left-container .flow-item {
    display: inline-block;
    width: 600px;
    float: left;
}

.flow-reply-row {
    display: inline-flex;
    align-items: flex-start;
    width: calc(100% - 625px);
    margin-left: -25px;
    padding-left: 18px;
    overflow-x: auto;
}

.flow-reply-row::-webkit-scrollbar {
    display: none;
}
.flow-reply-row {
    scrollbar-width: none;
}

.flow-reply-row:empty {
    margin: 0 !important;
    display: none;
}

.flow-item-row::after {
    content: "";
    display: block;
    clear: both;
}

.left-container .flow-reply {
    flex: 0 0 300px;
    max-height: 15em;
    margin-right: -7px;
    overflow-y: hidden;
}

.aux-margin,
.left-container .flow-item {
    margin-left: 50px;
}
.aux-margin {
    width: calc(100% - 2 * 50px);
}

@media screen and (max-width: 1300px) {
    .aux-margin,
    .left-container .flow-item {
        margin-left: 10px;
    }
    .aux-margin {
        width: calc(100% - 2 * 10px);
    }

    .flow-reply-row {
        width: calc(100% - 485px);
    }

    .left-container .flow-item {
        width: 500px;
    }

    .flow-item-row:hover::before {
        display: none;
    }
}

@media screen and (max-width: 900px) {
    .left-container .flow-item {
        display: block;
        width: calc(100vw - 20px);
        max-width: 500px;
        float: none;
    }

    .flow-reply-row {
        display: flex;
        width: 100% !important;
        margin-left: 0;
        padding-left: 30px;
        margin-top: -2.5em;
        margin-bottom: -1em;
    }
}

.left-container .flow-item-row {
    cursor: default;
}

.left-container .flow-item-row:hover::before {
    content: '>>';
    position: absolute;
    left: 10px;
    margin-top: 1.5em;
    color: white;
    text-shadow: 0 0 2px #000;
    font-family: 'Consolas', 'Courier', monospace;
}

.box-header, .box-footer {
    font-size: small;
}

.flow-item-row p.img {
    text-align: center;
    margin-top: .5em;
}
.flow-item-row p.img img {
    max-width: 100%;
    box-shadow: 0 1px 5px rgba(0,0,0,.4);
}
.left-container .flow-item-row p.img img {
    max-height: 80vh;
}

.box-header-badge {
    float: right;
    margin: 0 .5em;
}

.flow-item-dot {
    position: relative;
    top: calc(-.5em - 4px);
    left: calc(-.5em - 4px);
    width: 10px;
    height: 10px;
    margin-bottom: -10px;
    border-radius: 50%;
    background-color: #ffbb44;
    box-shadow: 0 0 5px rgba(0,0,0,.4);
}

.box-content {
    margin: .5em 0;
}

.box-id {
    color: #666666;
}

.box-id a:hover::before {
    content: "复制全文";
    position: relative;
    width: 5em;
    height: 1.3em;
    line-height: 1.3em;
    margin-bottom: -1.3em;
    border-radius: 3px;
    text-align: center;
    top: -1.5em;
    display: block;
    color: white;
    background-color: rgba(0,0,0,.6);
    pointer-events: none;
}

.flow-item-row-quote {
    opacity: .8;
    filter: brightness(90%);
}

.flow-item-quote>.box {
    margin-left: 2.5em;
    max-height: 15em;
    overflow-y: hidden;
}

.flow-item-quote .flow-item-dot,
.flow-item-quote .box-id a:hover::before {
    display: none;
}

.quote-tip {
    margin-top: .5em;
    margin-bottom: -10em; /* so that it will not block reply bar */
    float: left;
    display: flex;
    flex-direction: column;
    width: 2.5em;
    text-align: center;
    color: white;
}