.inner_main_contents {
    padding: 0;
    overflow: hidden;
}

/* lecture info box */
.top_content {
    padding: 20px 30px 0;
    overflow: hidden;
}

.lecture_info_box {
    float: left;
    width: 57.73%;
}

.lecture_sub_content {
    display:none;
    padding: 30px 0;
}
.lecture_sub_content.selected{
    display:block;
}
.lecture_sub_content.board_content{
    margin-top: 30px;
    padding:0;
    border-top: 1px solid var(--nj-border);
}

.lecture_introduction {
    padding: 0 40px;
    font-size: 20px;
}
.lecture_introduction .trader_name{
    margin-top: var(--nj-space-lg);
    font-weight: 700;
    text-align: center;
    color: var(--nj-school-primary);
    font-size: 22px;
}
.lecture_introduction .trader_name .request_package_btn.mobile{
    display:none;
}
.lecture_introduction .slogan{
    margin-top: var(--nj-space-lg);
    font-weight: 700;
    text-align: center;
    color: var(--nj-dark);
    font-size: 16px;
    line-height: 1.5;
    word-break: keep-all;
}
.lecture_introduction .divider{
    margin-top: 30px;
    margin-bottom: 30px;
    height: 2px;
    background-color: var(--nj-border-form);
}
.introduction_pc img{
    width:100%;
}
.introduction_mobile{
    display:none;
}
.introduction_mobile img{
    width:100%;
}

.top_menu_placeholder{
    position:absolute;
    left:0;
    top:26vw;
    width:100%;
    height:1px;
}

.lecture_img_box{
    max-height: 28vw;
    overflow: hidden;
}
.lecture_img {
    margin-top: -3vw;
    display:block;
    width: 100%;
    background-color: #eee; /* 임시 배경 */
}

.lecture_title {
    margin-top: 20px;
    font-size: 20px;
}

.lecture_title.margin_b {
    margin-bottom: 20px;
}

.lecture_description {
    color: var(--nj-text-secondary);
    font-size: 20px;
    margin: 20px 0;
}

.tag_box {
    position: relative;
    overflow: hidden;
    margin-bottom: 24px;
}

.tag_box li {
    float: left;
    font-size: 20px;
    color: var(--nj-text-secondary);
}

.tag_box li:nth-child(n+2) {
    margin-left: 20px;
}


.lecture_video_count::before,
.lecture_time::before,
.data_status::before {
    content: '';
    display: inline-block;
    vertical-align: middle;
    margin-right: 5px;
    margin-bottom: 4px;
    width: 21px;
    height: 16px;
    background-repeat: no-repeat;
}

.lecture_video_count::before {
    background-image: url(../images/ic_video.png);
}

.lecture_time::before {
    background-image: url(../images/ic_time.png);
}

.data_status::before {
    width: 20px;
    height: 21px;
    background-image: url(../images/ic_download.png);
}

/* video box */
.video_box {
    float:none;
    margin: 20px 0 0 0;
    width: 100%;
    height: 600px;
}
.video_box .cdn_video_player{
    width:100%;
    height:100%;
}

.video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #eee;
}

.lecture_view_content {
    margin: 12px 30px 0 30px;
}

/* buy box */
.buy_box {
    float: right;
    width: 40.23%;
    padding: 30px;
    margin-left: 2%;
    margin-bottom: 24px;
    box-shadow: 0 3px 50px #0000001A;
}

.buy_box_title {
    font-size: 20px;
}

.teacher_name {
    display: block;
    font-size: 20px;
    color: var(--nj-text-secondary);
    margin-top: 15px;
}

.buy_description_switch {
    display: none;
}

.buy_description {
    display: block;
    font-size: 14px;
    line-height: 30px;
    background-color: #F4F4F4;
    padding: 15px 20px;
    margin-top: 20px;
    color: var(--nj-text-secondary);
}

.price_title {
    display: block;
    margin: 50px 0 6px;
    text-align: right;
    font-size: 20px;
    color: var(--nj-text-secondary);
}

.price {
    display: block;
    font-size: 26px;
    font-weight: bold;
    text-align: right;
}

.buy_box .buy_btn {
    width: 100%;
    margin: 20px 0 0;
    font-size: 14px;
    font-weight: bold;
    padding: 14px 24px;
    text-align: center;
}


/* lecture_sub_content */
.lecture_sub_content_nav {
    display:block;
    width:100%;
    background-color: var(--nj-bg-page);
    border-bottom: 1px solid var(--nj-border-light);
    justify-content: center;
}
.lecture_sub_content_nav > ul {
    display: flex;
    margin: auto;
    max-width:1200px;
    height: 52px;
}
.lecture_sub_content_tag {
    text-align: center;
    font-size: 14px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: border-color var(--nj-transition-normal);
}
.lecture_sub_content_tag .mobile_hide{
    margin-bottom: 5px;
}
.lecture_sub_content_tag.buy{
    display: flex;
    margin-left:auto;
    margin-right: 20px;
    justify-content: center;
    align-items: center;
    border-bottom: none;
}
.lecture_sub_content_tag a{
    display: flex;
    padding: 0 30px;
    align-items: center;
    height: 100%;
    color: var(--nj-text-secondary);
    font-weight: 500;
    white-space: nowrap;
    transition: color var(--nj-transition-normal);
}

.lecture_sub_content_tag:hover {
    border-bottom-color: var(--nj-border);
}
.lecture_sub_content_tag:hover a{
    color: var(--nj-dark);
}
.lecture_sub_content_tag.current {
    border-bottom-color: var(--nj-school-primary);
}
.lecture_sub_content_tag.current a{
    color: var(--nj-dark);
    font-weight: 700;
}

.lecture_sub_content_tag .request_package_btn{
    width: 150px;
    padding: 0;
    justify-content: center;
    height: 40px;
    border-radius: 5px;
    color: #fff;
    font-weight: 700;
    background-color: var(--nj-accent-red);
    transition: background-color var(--nj-transition-normal);
}
.lecture_sub_content_tag .request_package_btn:hover{
    color: #fff;
    background-color: var(--nj-accent-red-hover);
}
.lecture_sub_content_tag .request_package_btn.disabled{
    height:auto;
    color:var(--nj-dark);
    font-size: 16px;
    background-color: var(--nj-text-disabled);
}
.lecture_sub_content_tag .request_package_btn.show_email{
    height:auto;
    color:var(--nj-dark);
    font-size: 16px;
    background-color: var(--nj-accent-red);
}

/* curriculum */
.curriculum_box{
    margin-top: 30px;
}
.curriculum_chapter {
    min-height: 80px;
    line-height: 1.4;
    font-size: 20px;
    color: #000;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    margin: 0;
    padding: 16px 60px 16px 0;  /* 우측 60 = 화살표 공간. 좌측은 .chapter_number margin-left 30 으로 위임 */
    word-break: keep-all;
    overflow-wrap: break-word;
}
.curriculum_chapter .chapter_name {
    flex: 1 1 auto;
    min-width: 0;  /* flex item 의 텍스트 wrap 가능하게 */
}
.chapter_number{
    margin-left: 30px;
}
.chapter_name{
    margin-left: 30px;
}

.chapter_introduction {
    font-size: 20px;
    color: var(--nj-text-secondary);
    width: 320px;
    height: 25px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chapter_introduction.full_size {
    width: 100%;
    height: auto;
}

.lecture_video_list {
    display: none;
    overflow: hidden;
}

.white_border_box.lecture_video {
    padding:0;
    margin-bottom: 0;
    width:100%;
}
.white_border_box.lecture_video:nth-child(odd) {
    background-color: #FAFAFA;
}
.white_border_box.lecture_video:nth-child(even) {
    background-color: #fff;
}

.lecture_video_img {
    display: block;
    float: left;
    width: 43.38%;
    height: 170px;
    background-color: #eee;/* 임시 배경 */
}

.lecture_video_text_box {
    display:flex;
    width:100%;
    height:80px;
    padding-left: 30px;
    align-items: center;
}

.lecture_video_chapter_number {
    font-size: 20px;
    color: var(--nj-text-secondary);
}

.lecture_video_title {
    margin-left: 30px;
    font-size: 20px;
}

.lecture_video_time {
    font-size: 20px;
    color: var(--nj-text-secondary);
    margin-bottom: 10px;
}

.lecture_video_time::before {
    content: '';
    display: inline-block;
    vertical-align: middle;
    width: 23px;
    height: 23px;
    margin-right: 5px;
    margin-bottom: 3px;
    background-image: url(../images/ic_time.png);
}

.lecture_video_download_btn {
    display: inline-block;
    padding: 10px;
    background-color: var(--nj-border-dark);
    border-radius: 5px;
}

.lecture_video_download_btn_text::before {
    content: '';
    display: inline-block;
    vertical-align: middle;
    width: 17.17px;
    height: 18.41px;
    margin-right: 9px;
    margin-bottom: 2px;
    background-image: url(../images/ic_download.png);
    background-size: cover;
}

.video_player_iframe{
    display:none;
    width:1200px;
    height:700px;
}

/* toggle btn */
.white_border_box.chapter {
    padding:0;
    position:relative;
    min-height:80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.chapter_switch {
    display: none;
}

.chapter_switch_label {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url(../images/btn_arrow_down.png);
    background-repeat: no-repeat;
    background-position: center right 40px;
    cursor: pointer;
    z-index: 1;
}

.chapter_switch:checked + .chapter_switch_label {
    background-image: url(../images/btn_arrow_up.png);
}

.chapter_switch:checked ~ .lecture_video_list {
    display: block;
    position: relative;
    z-index: 2;
}

.chapter_switch:checked ~ .chapter_introduction {
    width: 100%;
    height: auto;
}

/* board */
.board_header {
    padding: 13px 0;
    border-top: 1px solid #CECECE;
    border-bottom: 1px solid #CECECE;
    font-size: 16px;
    font-weight: bold;
    color: #252D3A;
    overflow: hidden;
}

.board_header > * {
    float: left;
    text-align: center;
}

.board_title_guide {width: 72%;}
.board_writer_guide {width: 14%;}
.board_date_guide {width: 14%;}

.board_title {width: 67%; cursor:pointer;}
.board_date {
    color:var(--nj-text-disabled);
    font-size: 15px;
}
.board_writer{
    color: var(--nj-text-disabled);
    font-size: 15px;
    line-height: normal;
}

.board {
    display:flex;
    padding:0 20px;
    border-bottom: 1px solid var(--nj-text-disabled);
    flex-direction: column;
}
.board[data-user-id="7"]{
    display:none;
}
.board[data-user-id="7"][data-my-id="7"]{
    display:flex;
}
.board_post_meta_info_box{
    display:flex;
    margin-top: 30px;
    justify-content: space-between;
    align-items: center;
}
.board_post_meta_info_box.bottom{
    margin-top: 0;
    margin-bottom: 5px;
}
.board_post_meta_info_box.one_row{
    margin:20px 0;
    padding: 0 15px;
}
.meta_info_left{
    display:flex;
    gap:20px;
    align-items: center;
}
.qna_answer_status{
    display:none; /* 답변대기 항목 제거 */
    color: var(--nj-accent-red);
    font-size: 15px;
    font-weight: 700;
}
.qna_answer_status.complete{
    color: var(--nj-school-primary);
}
/* 게시글 row 분기 — nineview 톤(soft tint + 좌측 accent border)으로 통일.
   기존 antiquewhite/#cfffeb/#e0f6ff/#FFEB33 (채도 높은 pastel) 대체. */
.board.teacher_article {
    background: rgba(50, 195, 135, 0.07);
    border-left: 3px solid var(--nj-school-primary);
}
.board[data-user-id="1"] {
    background: rgba(50, 195, 135, 0.05);
}
.board[data-user-id="5"] {
    background: rgba(45, 91, 255, 0.05);
}

/* 고정글 — primary soft tint + 좌측 accent + [고정] 배지 */
.board.top_fix_post {
    background: var(--nj-primary-soft);
    border-left: 3px solid var(--nj-primary);
}
.board.top_fix_post .board_post_name {
    color: var(--nj-dark);
    font-weight: 700;
}
.board.top_fix_post .board_post_name::before {
    content: '고정';
    display: inline-flex;
    align-items: center;
    margin-right: 8px;
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--nj-primary);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    line-height: 1.5;
    flex-shrink: 0;
    letter-spacing: 0.3px;
}
.board.top_fix_post .board_date,
.board.top_fix_post .board_writer {
    color: var(--nj-text-secondary);
}
.board.top_fix_post .board_post_meta_info_box {
    margin-top: 15px;
}
.board.top_fix_post .board_post_meta_info_box.bottom {
    margin-top: 0;
}

.qna_lecture_name {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--nj-primary-soft);
    color: var(--nj-primary);
    font-size: 12px;
    font-weight: 600;
    line-height: 1.6;
    letter-spacing: 0.2px;
    vertical-align: middle;
    flex-shrink: 0;
}
.board_reply_count{
    display:flex;
    margin-top: 10px;
    color:var(--nj-text-disabled);
    font-size: 15px;
    justify-content: center;
    gap:11px;
}

.board_post_name{
    flex-grow:1;
    display:flex;
    flex-wrap: wrap;
    padding:10px 0 0 0;
    color: var(--nj-dark);
    font-size: 15px;
    align-items: center;
}
.board_post_name:visited{
    color:var(--nj-text-disabled);
}
/* 강좌 공지사항에서는 색상 변하지 않음 */
/* 강좌 고정글에서도 색상이 변하지 않음 */
/* Q&A 게시글에서도 색상이 변하지 않음 */
.top_fix_post .board_post_name:visited,
.notice_board .board_post_name:visited,
.qna_board_body .board_post_name:visited{
    color: var(--nj-dark);
}

.last_read_post_pill{
    margin-right: 5px;
    padding:3px;
    border-radius:5px;
    font-size: 12px;
    color:#fff;
    background-color: var(--nj-accent-red);
}

.qua_board_notice_box{
    display: flex;
    align-items: center;
    justify-content: center;
    padding-bottom: 1px;
    width: 100%;
    line-height: 24px;
    background-color: antiquewhite;
    text-align: center;
    font-size: 20px;
}

.qua_board_notice_box .board_warning_pc{
    display:block;
    width:100%;
}
.qua_board_notice_box .board_warning_mo{
    display:none;
    width:100%;
}

.board_body {
    margin-bottom: 50px;
    border-bottom: solid 2px var(--nj-dark);
}
.board_empty_row{
    width:100%;
    height:40px;
    line-height: 40px;
    text-align: center;
    font-weight: bold;
    border-bottom: solid 1px #CECECE;
}

.board_title_box{
    display:flex;
    margin-top: var(--nj-space-2xl);
    justify-content: space-between;
}
.board_title_name{
    color: var(--nj-dark);
    font-size: 20px;
    font-weight: 700;
    line-height: normal;
}

.board_search_box{
    height: 40px;
    text-align: center;
}
.board_search_box.bottom{
    display: flex;
    margin: 40px auto 150px auto;
    justify-content: center;
}
.board_search_box form{
    display:flex;
    gap:20px;
}
.search_select{
    padding: 5px 0 0 10px;
    width: 180px;
    height: 40px;
    font-size: 14px;
    font-family: var(--nj-font-heading);
    border-radius: var(--nj-radius-md);
    border: 1px solid var(--nj-border);
}
.search_input{
    padding: 5px 0 0 10px;
    width: 270px;
    height: 40px;
    font-size: 14px;
    font-family: var(--nj-font-heading);
    border-radius: var(--nj-radius-md);
    border: 1px solid var(--nj-border);
    vertical-align: bottom;
}
.search_button{
    width: 75px;
    height: 40px;
    line-height: normal;
    text-align: center;
    font-family: var(--nj-font-heading);
    font-size: 14px;
    color:#fff;
    border-radius: var(--nj-radius-md);
    border:none;
    background-color: var(--nj-school-primary);
    cursor:pointer;
}

.board_control_box {
    display:flex;
    justify-content: space-between;
    align-items: center;
}
.board_control_box.top{
    margin-top:10px;
}

.pagination_box {
    display:flex;
    margin: 0 auto;
    gap:15px;
}

.page_col {
    color: var(--nj-text-disabled);
    padding: 10px 15px;
}
.page_col:hover{
    color: var(--nj-dark);
}
.page_col.current_page_num {
    color: var(--nj-dark);
}

.page_col.previous {
    margin: 0 5px 0 0;
}

.page_col.next {
    margin: 0 0 0 5px;
}

.btn_line {
    float: left;
    height: 39px;
    border-right: 1px solid var(--nj-border-dark);
    margin: 0 5px;
}

.btn_line.previous {
    margin-right: 10px;
}

.board_write_btn {
    align-self: flex-start;
    font-size: 16px;
    background-color: var(--nj-accent-red);
    color: white;
    padding: 10px;
}
.board_write_btn.for_mobile{
    display:none;
}

.course_calendar{
    width:100%;
}

.qna_modal_btn{
    display:none;
    margin: 10px auto;
    width:130px;
    height:50px;
    line-height: 50px;
    background-color: var(--nj-dark);
    text-align: center;
    font-size: 20px;
    color:#fff;
    font-family: var(--nj-font-heading);
    border:none;
    border-radius: 5px;
}

/* qna modal */
.write_qna_modal .bg{
    z-index:500;
}
.write_qna_modal .modal_box{
    min-width:600px;
    width:60%;
    min-height:500px;
    height:auto;
}
.write_qna_modal .title_box{
    font-size: 24px;
    font-weight: bold;
}
.write_qna_modal .qna_post_info{
    display:flex;
    gap:5px;
    flex-direction: column;
    margin-bottom: 10px;
}
.write_qna_modal .qna_post_info_input_box{
    width:100%;
    text-align: left;
}
.write_qna_modal .qna_label{
    display:block;
    font-size: 16px;
    font-weight: bold;
}
.write_qna_modal .input{
    margin-top: 5px;
    padding-left: 5px;
    width:100%;
    height: 30px;
    font-size: 16px;
    font-family: var(--nj-font-heading);
    border-radius: 5px;
    border:solid 1px var(--nj-text-disabled);
}
.write_qna_modal .title_input{
    margin-top: 5px;
    height:40px;
    font-size: 20px;
}
.write_qna_modal .modal_content{
    text-align: left;
}
.write_qna_modal .qna_summer_note{
    width:100%;
    min-height:250px;
    text-align: left;
}
.write_qna_modal .modal_button_box{
    display:flex;
    gap:15px;
}
.write_qna_modal .cancel_btn{
    flex-grow: 1;
    background-color: #FFF;
    border: solid 2px var(--nj-dark);
    font-family: var(--nj-font-heading);
}
.write_qna_modal .submit_btn{
    flex-grow: 1;
    font-weight: bold;
    background-color: var(--nj-dark);
    border: solid 2px var(--nj-dark);
    color:#fff;
    font-family: var(--nj-font-heading);
}

@media screen and (max-width: 1200px){
    .lecture_sub_content_tag{
        width : calc(100% / 7);
        font-size: 16px;
    }
    .lecture_sub_content_tag a {
        justify-content: center;
    }
    .lecture_sub_content_tag.buy{
        display:none;
    }
    .lecture_introduction .trader_name .request_package_btn.mobile{
        display:block;
        margin: 10px auto;
        width: 100px;
        height: 30px;
        line-height: 30px;
        color: #FFF;
        text-align: center;
        font-size: 14px;
        font-style: normal;
        font-weight: 400;
        border-radius: 5px;
        background: var(--nj-accent-red);
    }
    .lecture_introduction .trader_name .request_package_btn.mobile.disabled{
        padding-top: 3px;
        width:120px;
        height:auto;
        line-height: 20px;
        color:var(--nj-dark);
        background-color: var(--nj-text-disabled);
    }
}
@media screen and (max-width: 870px) {
    .top_menu_placeholder{
        top:26vw;
    }

    .qua_board_notice_box .board_warning_pc{
        display:none;
    }

    .qua_board_notice_box .board_warning_mo{
        display:block;
    }
}
@media screen and (max-width: 768px) {
    .inner_main_contents {
        padding: 0 20px 20px;
    }

    .top_content {
        padding: 0;
    }

    .qua_board_notice_box{
        font-size:16px;
    }

    .lecture_info_box {
        width: 100%;
    }

    .lecture_title {
        font-size: 20px;
    }

    .lecture_title.margin_b {
        margin-bottom: 10px;
    }

    .lecture_description {
        font-size: 12px;
        margin: 10px 0;
    }

    .tag_box li {
        font-size: 12px;
    }

    .lecture_introduction .trader_name{
        margin-top: 10px;
    }

    .lecture_video_count::before,
    .lecture_time::before,
    .data_status::before {
        width: 15px;
        height: 15px;
        background-size: cover;
    }
    .board_control_box{
        height:auto;
        flex-wrap: wrap;
    }
    .board_control_box.top{
        display:none;
    }
    .pagination_box{
        gap:0;
    }
    .page_col{
        padding: 10px 13px;
    }

    .board_post_meta_info_box{
        margin-top: 20px;
    }
    .qna_lecture_name{
        font-size: 12px;
    }
    .board_reply_count{
        font-size: 12px;
    }
    .board_post_name{
        padding: 15px 0;
        font-size: 14px;
    }
    .board_post_meta_info_box.bottom{
        margin-bottom: 0;
    }

    .board_search_box{
        display:flex;
        height:auto;
    }
    .board_search_box form{
        gap:5px;
    }
    .board_search_box .search_select{
        width:95px;
        height:30px;
        font-size: 12px;
    }
    .board_search_box .search_input{
        width: 135px;
        height:30px;
        font-size: 12px;
    }
    .board_search_box .search_button{
        display:block;
        width:70px;
        height:30px;
        line-height: 30px;
        font-size: 12px;
    }
    .board_write_btn.for_mobile{
        display:inline-block;
        margin-right: 5px;
        padding:0;
        width: 70px;
        height: 30px;
        line-height: 30px;
        font-size: 12px;
    }

    .page_btn{
        float:none;
        display:inline-block;
    }

    /* video box */
    .video_box {
        margin-top: 10px;
    }

    .lecture_view_content {
        margin: 0 0 20px;
    }

    /* buy box */
    .buy_box {
        position: fixed;
        width: 100%;
        margin: 0;
        padding: 20px 20px 78px;
        bottom: 0;
        left: 0;
        border-top: 1px solid var(--nj-border-dark);
        background-color: white;
        z-index: 900;
    }
    .buy_box.mobile_hide{
        display:none;
    }

    .buy_box.no_fixed {
        display: none;
    }

    .buy_box_title {
        font-size: 24px;
    }

    .teacher_name {
        font-size: 14px;
        padding: 5px 0 20px;
        margin: 0;
        border-bottom: 1px solid var(--nj-border-dark);
    }

    .introduction_pc{
        display:none;
    }
    .introduction_mobile{
        display: block;
    }

    .buy_description_box::after {
        display: block;
        width: 0;
        content: '';
        border-top: 6px solid #F4F4F4;
        border-bottom: 6px solid transparent;
        border-right: 8px solid transparent;
        border-left: 8px solid #F4F4F4;
    }

    .buy_description_switch:checked ~ .buy_description_box {
        display: block;
    }

    .buy_description_box {/* 안내창 toggle */
        display: none;
        position: absolute;
        bottom: 105px;
        width: calc(100% - 40px);
    }

    .buy_description {
        line-height: 22px;
    }

    .buy_description_switch_label::after {
        content: '';
        display: block;
        position: absolute;
        bottom: 82px;
        left: 20px;
        width: 24px;
        height: 24px;
        background-image: url(../images/btn_caution_buy.png);
    }


    .price_title {
        font-size: 10px;
        margin-top: 20px;
    }

    .price {
        font-size: 26px;
    }

    .buy_box .buy_btn {
        position: absolute;
        margin: 0;
        padding: 20px;
        font-size: 14px;
        bottom: 0;
        left: 0;
        border-radius: 0;
    }

    /* 하단에 입금 정보가 있을 때  */
    .buy_box.no_bank_info{
        padding-bottom: 108px;
    }
    .buy_box.no_bank_info .buy_description_switch_label::after{
        bottom:122px;
    }
    .buy_box.no_bank_info .buy_description_box{
        bottom: 145px;
    }
    .buy_box.no_bank_info .buy_btn{
        line-height: 18px;
        padding: 10px;
    }

    .lecture_sub_content_tag a{
        font-size: 14px;
        padding: 12px 0 12px 0;
        white-space: nowrap;
        justify-content: center;
        letter-spacing: -1px;
    }
    .lecture_sub_content_tag .mobile_hide{
        display:none;
    }

    .lecture_sub_content {
        padding-top: 26px;
    }

    .lecture_introduction {
        font-size: 14px;
        padding: 0;
    }

    .board_title_box{
        margin-top: 14px;
        align-items: center;
    }
    .board_title_name{
        font-size: 20px;
    }
    .board_title_name .mobile_hide{
        display: none;
    }

    /* curriculum */
    .curriculum_chapter {
        min-height: 50px;
        line-height: 1.4;
        font-size: 18px;
        padding: 12px 40px 12px 0;
    }

    .chapter_introduction {
        font-size: 14px;
        width: 100%;
        height: auto;
        padding-bottom: 30px;
    }

    .chapter_introduction.full_size {
        padding-bottom: 0;
    }

    .white_border_box.chapter {
        min-height:50px;
        border-radius: 10px;
        border: 2px solid var(--nj-border-form);
        background: #FFF;
    }

    .chapter_switch_label {
        display: none;
    }

    .chapter_switch_label_mobile {
        position: absolute;
        top: 0;
        left: 0;
        display: block;
        width: 100%;
        height: 100%;
        background-image: url(../images/2023_renew/icon_tri.png);
        background-repeat: no-repeat;
        background-position: center right 15px;
        cursor: pointer;
        z-index: 1;
    }

    .chapter_switch:checked ~ .chapter_switch_label_mobile {
        background-image: url(../images/2023_renew/icon_tri_up.png);
    }

    .chapter_number{
        margin-left: 10px;
    }

    .white_border_box.lecture_video {
        float: none;
        border-radius: 0;
        width: 100%;
        margin-top: 10px;
    }

    .white_border_box.lecture_video:nth-child(even) {
        margin-left: 0;
    }

    .lecture_video_img_box {
        position: relative;
        width: 100%;
        padding-bottom: 53.43%;
    }

    .lecture_video_img {
        position: absolute;
        width: 100%;
        height: 100%;
    }

    .lecture_video_text_box{
        padding-left: 10px;
        height:50px;
    }
    .lecture_video_chapter_number{
        font-size: 16px;
    }
    .lecture_video_title {
        font-size: 16px;
        height: auto;
    }

    .lecture_video_time {
        font-size: 12px;
        color: var(--nj-text-secondary);
        margin-bottom: 10px;
    }

    .lecture_video_time::before {
        width: 15px;
        height: 15px;
        background-size: cover;
    }

    .lecture_video_download_btn {
        display: block;
        width: 135.1px;
        margin: 0 auto 10px ;
    }

    .lecture_video_download_btn_text::before {
        width: 17.17px;
        height: 18.41px;
        background-size: cover;
    }

    /* board */
    .lecture_sub_content.board_content {
        padding: 10px 0 0 0;
    }

    .board_header {
        display: none;
    }

    .board_number {
        padding: 3px 0;
        font-weight:bold;
    }
    .board_writer {
        margin-right: 10px;
    }
    .board_writer,
    .board_date {
        color: #CECECE;
        font-size: 10px;
        width: auto;
    }

    .board {
        padding: 3px 10px;
    }
    .board_body{
        margin-bottom: 20px;
    }

    .board:nth-last-child(1) {
        border-bottom: 0;
    }

    .board_search_box.bottom{
        margin:30px auto;
    }

    /* top fix for mobile */
    .board.top_fix_post .board_reply_count,
    .board.top_fix_post .meta_info_left,
    .board.top_fix_post .board_writer{
        display:none;
    }
    .board.top_fix_post .board_post_name{
        padding: 10px 0;
        font-size: 14px;
    }

}

@media screen and (max-width: 640px) {
    .lecture_sub_content_tag a{
        font-size: 12px;
    }
    .board_title_name{
        font-size: 16px;
    }
    .qua_board_notice_box{
        display: flex;
        align-items: center;
        justify-content: center;
        height:auto;
        font-size:12px;
        line-height: normal;
    }
}


@media screen and (max-width:600px){
    .lecture_sub_content_nav > ul{
        height:auto;
        flex-wrap: wrap;
    }
    .lecture_sub_content_tag {
        width: calc(100% / 4);
    }
    /* 앞 3개 */
    /*.lecture_sub_content_tag:nth-child(-n+3) {*/
    /*    width: calc(100% / 3);*/
    /*}*/
    .lecture_sub_content_tag a{
        font-size: 14px;
    }
    .no_bank_modal .modal_box{
        padding: 30px 20px;
        width:100%;
    }
    .no_bank_modal .modal_box .title_box{
        flex-direction: column;
        align-items: center;
    }
    .no_bank_modal .modal_box .title{
        font-size: 14px;
        text-align: center;
    }
    .no_bank_modal .no_bank_email_form_box{
        margin-top: 18px;
        padding:20px 0;
        font-size: 14px;
    }
    .no_bank_modal .no_bank_mail_table{
        font-size: 14px;
    }
    .no_bank_modal .no_bank_warning{
        font-size: 12px;
    }
}

@media screen and (max-width: 500px) {
    .board_write_btn.for_mobile{
        width:50px;
    }
    .board_search_box .search_input{
        width:100px;
    }
    .meta_info_left{
        gap: 10px;
    }
    .lecture_sub_content_tag a{
        font-size: 12px;
    }
}

@media screen and (max-width: 425px){
    .lecture_introduction .slogan{
        line-height: 30px;
        font-size: 24px;
    }
    .board_title_box{
        flex-direction: column;
        align-items: flex-start;
    }
    .board_title_name{
        margin-bottom: 10px;
    }
    .board_search_box{
        margin:0 auto;
    }
    .qna_answer_status{
        font-size: 13px;
    }
    .meta_info_left{
        gap: 5px;
    }
    .board_body .board_date{
        display:none;
    }
}
@media screen and (max-width: 375px){
    .lecture_sub_content_nav > ul{
        height:auto;
        flex-wrap: wrap;
    }
    .lecture_sub_content_tag{
        width: calc(100% / 3);
    }

    .board_search_box .search_select{
        padding:3px 0 0 3px;
        width: 60px;
    }
    .board_search_box .search_input{
        width: 100px;
    }
    .board_search_box .search_button{
        width: 50px;
    }
}

@media screen and (max-width: 325px){
    .board_search_box .search_select{
        width:55px;
    }
    .board_search_box .search_input{
        width:80px;
    }
    .board_search_box .search_button{
        width:45px;
    }
}