.lr {
    display: -webkit-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
}

.lrw {
    display: -webkit-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -ms-flex-wrap: wrap;
    -webkit-flex-wrap: wrap;
    flex-wrap: wrap;
}

.lrc {
    display: -webkit-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
}

.quality_flex * {
    box-sizing: border-box;
}




/* 侧边导航栏 */
.quality_flex {
    justify-content: space-between;
    border: 1px solid rgba(231, 231, 231, 1);
    border-radius: 8px;
    /* overflow: hidden; */
}

.quality_left {
    width: 3.1rem;
    border-right: 1px solid rgba(231, 231, 231, 1);
    border-radius: 8px;
    background: rgba(247, 247, 247, 1);
}

.quality_right {
    width: calc(100% - 3.1rem);
    padding: .35rem .5rem .6rem;
}

.inner_menu {
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    display: none;
}

.siderbar_title {
    font-weight: 400;
    color: transparent;
    font-size: var(--font36);
}

.quality_title {
    font-weight: 400;
    color: transparent;
    font-size: var(--font36);
    padding: .35rem 0;
    border-bottom: 1px solid rgba(231, 231, 231, 1);
}

/* 按钮 */
.menu_toggle {
    position: relative;
    top: auto;
    left: auto;
    cursor: pointer;
    box-sizing: content-box;
    font-size: 20px;
    padding-left: 26px;
    height: 25px;
    display: block;
}

.menu_toggle span {
    width: 25px;
    top: 50%;
    transform: translateY(-50%);
    transform-origin: 50% 50%;
}

.menu_toggle span,
.menu_toggle span::before,
.menu_toggle span::after {
    position: absolute;
    left: 0;
    height: 2px;
    background: #182631;
    transition: all .1s ease
}

.menu_toggle span::before,
.menu_toggle span::after {
    content: '';
    width: 100%
}

.menu_toggle span::before {
    top: -8px
}

.menu_toggle span::after {
    bottom: -8px
}

.menu_toggle.toggle-open span {
    background: transparent;
    transform: rotate(45deg);
}

.menu_toggle.toggle-open span::before {
    transform: translate3d(0, 8px, 0)
}

.menu_toggle.toggle-open span::after {
    transform: rotate(-90deg) translate3d(8px, 0, 0)
}

.menu_toggle:hover span,
.menu_toggle:hover span::before,
.menu_toggle:hover span::after {
    background: var(--main-color);
}

@media only screen and (max-width: 920px) {

    .quality_right,
    .quality_left {
        width: 100%;
    }

    .quality_left {
        border-right: none;
        border-bottom: 1px solid rgba(231, 231, 231, 1);
    }

    /* .siderbar {
        box-shadow: 0px 0px 4px 0px rgba(0, 0, 0, 0.1);
    } */

    .inner_menu {
        display: flex;
    }

    .submenu {
        display: none;
    }

    .quality_title {
        display: none;
    }

}

@media only screen and (max-width: 500px) {
    .quality_right {
        padding: 10px;
    }
}


/* 第一级 */
.first_item {
    padding: .2rem 0 .2rem .5rem;
    border-bottom: 1px solid rgba(231, 231, 231, 1);
}

.first_item.selected {
    background: #fff;
}

.first_title {
    position: relative;
    color: rgba(51, 51, 51, 1);
    font-size: var(--font18);
    font-weight: 400;
}

.first_title:hover {
    color: rgba(31, 162, 204, 1);
}

.first_item.selected .first_title {
    color: rgba(31, 162, 204, 1);
}

.first_title::before {
    content: "";
    position: absolute;
    left: -0.3rem;
    top: 3px;
    width: .2rem;
    height: .2rem;
    background: url(../images2/triangle01.svg) no-repeat center;
    background-size: 100% auto;
    transition: all .3s;
}

.first_item.selected .first_title::before {
    background-image: url(../images2/triangle02.svg);
}

.second_menu {
    margin-top: .05rem;
    display: none;
}

.second_title {
    color: #777777;
    font-size: var(--font14);
    font-weight: 400;
    line-height: 1.75;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: .1rem;
}

.second_title:hover {
    color: #333333;
}

.second_item.selected .second_title {
    color: #333333;
    font-weight: 500;
}
.second_box_m .second_title{
  font-size: var(--font14);
}

@media only screen and (max-width: 920px) {
    .first_item {
        border-top: 1px solid rgba(231, 231, 231, 1);
        border-bottom: none;
    }
}

@media only screen and (max-width: 767px) {
    .first_title::before {
        width: 16px;
        height: 16px;
        left: -24px;
    }

    .second_title {
        font-size: 12px;
    }
}