.main_top_section {
    background: #222;
    color: var(--white);
}

.main_top_section .video_swiper,
.main_top_section .video_swiper_slide {
    width: 100%;
    height: 100vh;
}

.video_swiper_slide video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.video_swiper_slide::before {
    content: '';
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.3);
}

.main_top_section .text_box {
    position: absolute;
    left: 15px;
    bottom: 210px;
    z-index: 1;
}

.main_top_section .text_box p {
    margin-top: 20px;
    /* 16px */
    font-size: 1rem;
    /* 28px */
    line-height: 1.75;
}

.main_top_section .text_box h5 {
    margin-bottom: 10px;
    opacity: 0.4;
}

.swiper_controls_wrap {
    position: absolute;
    bottom: 100px;
    left: 0;
    width: 100%;
    z-index: 1;
}

.swiper_controls {
    display: flex;
    gap: 24px;
    align-items: center;
}

.video_swiper_pagination {
    position: static;
    text-align: left;
}

.video_swiper_pagination>* {
    opacity: 0.4;
}

.video_swiper_pagination>.swiper-pagination-current {
    opacity: 1;
}

.circle_timer_button {
    position: relative;
    width: 52px;
    height: 52px;
    cursor: pointer;
}

.progress_ring {
    transform: rotate(-90deg);
    width: 100%;
    height: 100%;
}

.circle_timer_button circle.bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.1);
    stroke-width: 2;
}

.circle_timer_button circle.progress {
    fill: none;
    stroke: white;
    stroke-width: 2;
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
}

.play_icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 14px;
    pointer-events: none;
}



.main_platform_section {
    margin: 143px 0;
    text-align: center;
}

.main_platform_section .tab_btn_area {
    display: flex;
    margin: 50px 0;
    gap: 12px;
    justify-content: center;
}

.main_platform_section .tab_btn_area button {
    padding: 12px 28px;
    outline: none;
    border: none;
    border-radius: 50px;
    background: var(--gray_5);
    color: var(--gray_40);
    /* 20px */
    font-size: 1.25rem;
    /* 32px */
    line-height: 1.6;
    font-weight: 700;

}

.main_platform_section .tab_btn_area button.on {
    background: var(--gray_90);
    color: var(--white);
}

.main_platform_section .row {
    gap: 40px;
}

.main_platform_section article {
    padding: 90px 20px 80px;
    background: var(--gray_5);
    border-radius: 24px;
    flex: 1;
}

.main_platform_section article .title {
    margin: 38px 0 14px;
}

.main_platform_section article .desc {
    max-width: 250px;
    margin: 0 auto;
    /* 18px */
    font-size: 1.125rem;
    /* 28px */
    line-height: 1.55;
}


.main_intro_section {
    padding: 200px 0;
    background: #141414;
    color: var(--white);
    text-align: center;
}

.main_intro_section .row {
    margin-top: 70px;
    gap: 40px;
}
.main_intro_section article {
    width: 100%;
}
.main_intro_section .row img {
    max-width: 100%;
}

.main_intro_section article p {
    margin-top: 32px;
    /* 18px */
    font-size: 1.125rem;
    /* 32px */
    line-height: 1.78;
    opacity: 0.8;
}


.main_board_section {
    padding: 240px 0;
}

.main_board_section .row {
    /*     gap: 80px; */
}

.main_board_section .notice_box,
.main_board_section .qna_box {
    margin: 20px 0;
}

.main_board_section .notice_box {
    flex: 1.15;
    padding-right: 80px;
}

.main_board_section .qna_box {
    flex: 0.85;
    padding-left: 80px;
    border-left: 1px solid var(--gray_20);
}

.main_board_section .main_section_title {
    margin-bottom: 40px;
}

.board_content li a {
    display: flex;
    padding: 28px 0;
    border-bottom: 1px solid var(--gray_20);
    align-items: center;
    justify-content: space-between;
}

.board_content li .board_item_title {
    display: flex;
    flex: 1;
    gap: 12px;
    padding-right: 15px;
    align-items: center;
}

.board_content li .board_item_reg {
    width: 100px;
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--gray_50);
}

.qna_content ul {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.qna_content li a {
    display: flex;
    padding: 32px 36px;
    background: var(--gray_5);
    align-items: center;
    justify-content: space-between;
}

.qna_content li .qna_item_title {
    display: flex;
    align-items: center;
    gap: 14px;
}


.main_bottom_section {
    position: relative;
    padding: 200px 0;
    background: #141414;
    text-align: center;
    color: var(--white);
}

.main_bottom_section::before {
    content: '';
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.3);
    z-index: 1;
}
.main_bottom_section .container {
    z-index: 1;
}
.main_bottom_section video {
    position: absolute;
    object-fit: cover;
    width: 100%;
    height: 100%;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;

}

.main_bottom_section .link_area {
    display: flex;
    margin-top: 60px;
    gap: 24px;
    justify-content: center;
    align-items: center;
}

.main_bottom_section .link_area a {
    position: relative;
    padding: 20px 48px;
    border: none;
    background: transparent;
    color: white;
    font-size: 1.5rem;
    line-height: 1.5;
    font-weight: 700;
    border-radius: 50px;
    z-index: 1;
    overflow: hidden;
}

.main_bottom_section .link_area a::before {
    content: '';
    position: absolute;
    inset: 0;
    padding: 2px;
    /* 테두리 두께 */
    border-radius: 48px;
    background: linear-gradient(90deg, #ffffffcc, #ffffff33);
    /* 흰색 그라데이션 */
    -webkit-mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    z-index: -1;
}

.main_bottom_section .link_area a>span,
.main_bottom_section .link_area a>img {
    display: inline-block;
    vertical-align: middle;
}

.btn_scroll_top {
    display: flex;
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 68px;
    height: 68px;
    align-items: center;
    justify-content: center;
    outline: none;
    border: none;
    border-radius: 10px;
    background: var(--white);
    font-size: 0;
    z-index: 1;
}

.btn_scroll_top img {
    display: block;
}