.section_bg {
    background-color: var(--background-color)
}

/* =========================
   sub1_2 섹션 1 : 인트로
========================= */
.sub1_2_intro {
    padding: clamp(80px, 8vw, 140px) 0;
    width: 100%;
}

.sub1_2_intro_content {
    text-align: center;
}

.sub1_2_intro_content h2 {
    font-size: var(--sub-title-font-size);
    line-height: var(--sub-title-font-size-line);
    font-weight: 700;
    color: var(--base-color-darkblack);
    margin-bottom: 12px;
}

.sub1_2_intro_sub {
    font-size: var(--text-font-title-size);
    line-height: var(--text-font-title-size-line);
    color: var(--signature-color);
    font-weight: 500;
    margin-bottom: clamp(30px, 3vw, 50px);
}

.sub1_2_intro_desc p {
    font-size: var(--text-font-size);
    line-height: var(--text-font-size-line);
    color: var(--base-color-sub-black);
    word-break: keep-all;
}

/* =========================
   sub1_2 섹션 2 : 히스토리
========================= */
.sub1_2_history {
    width: 100%;
}

.sub1_2_history_inner {
    display: flex;
    min-height: 500px;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 clamp(20px, 3vw, 40px);
}

.sub1_2_history_text {
    width: 42%;
    flex-shrink: 0;
    padding: clamp(50px, 5vw, 80px) clamp(30px, 4vw, 80px);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.sub1_2_history_year {
    font-family: var(--font-EN-serif);
    font-size: clamp(36px, 4.2vw, 80px);
    font-weight: 700;
    color: var(--base-color-darkblack);
    margin-bottom: clamp(30px, 3vw, 50px);
}

.sub1_2_history_label {
    display: block;
    font-size: clamp(16px, 1.05vw, 20px);
    color: var(--signature-color);
    font-weight: 500;
    margin-bottom: 8px;
}

.sub1_2_history_title {
    font-size: var(--text-font-title-size);
    line-height: var(--text-font-title-size-line);
    font-weight: 700;
    color: var(--base-color-darkblack);
    margin-bottom: clamp(20px, 2vw, 30px);
}

.sub1_2_history_list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sub1_2_history_list li {
    font-size: var(--text-font-size);
    line-height: var(--text-font-size-line);
    color: var(--base-color-sub-black);
    padding: 4px 0;
    padding-left: 14px;
    position: relative;
}

.sub1_2_history_list li::before {
    content: '·';
    position: absolute;
    left: 0;
    color: var(--base-color-sub-black);
}

.sub1_2_history_img {
    flex: 1;
    overflow: hidden;
}

.sub1_2_history_img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

@media (max-width: 768px) {
    .sub1_2_history_inner {
        flex-direction: column;
    }

    .sub1_2_history_text {
        width: 100%;
    }

    .sub1_2_history_img {
        min-height: 300px;
    }
}


/* =========================
   sub1_3 섹션 1 : Organization
========================= */
.sub1_3_section_1 {
    background-color: var(--background-color);
    padding: clamp(60px, 6vw, 120px) 0;
}

.sub1_3_inner {
    display: flex;
    margin: 0 auto;
    align-items: stretch;
}

/* Left image column */
.sub1_3_img_col {
    width: 38%;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}

.sub1_3_img_col img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.sub1_3_img_text {
    position: absolute;
    bottom: clamp(20px, 3vw, 50px);
    left: clamp(20px, 3vw, 50px);
    font-size: clamp(36px, 4vw, 80px);
    line-height: 1;
    font-weight: 700;
    color: var(--base-color-white);
    letter-spacing: -0.02em;
}

/* Right list column */
.sub1_3_list_col {
    flex: 1;
    display: flex;
    align-items: center;
}

.sub1_3_list {
    list-style: none;
    padding: 0;
    margin: 0;
    width: 100%;
}

.sub1_3_item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: clamp(24px, 2.5vw, 40px) 0;
    border-bottom: 1px solid rgba(53, 45, 40, 0.15);
}

.sub1_3_item:last-child {
    border-bottom: none;
}

.sub1_3_item_info h4 {
    font-size: var(--text-font-title-size);
    line-height: var(--text-font-title-size-line);
    font-weight: 700;
    color: var(--base-color-black);
    margin-bottom: 6px;
}

.sub1_3_item_info p {
    font-size: var(--text-font-size);
    line-height: var(--text-font-size-line);
    color: var(--base-color-black);
}

.sub1_3_item_tags {
    font-size: var(--text-font-size);
    color: var(--signature-color);
    font-weight: 400;
    white-space: nowrap;
    margin-left: 30px;
}

/* 반응형 */
@media (max-width: 1024px) {
    .sub1_3_inner {
        flex-direction: column;
    }

    .sub1_3_img_col {
        width: 100%;
        height: auto;
        max-height: none;
    }

    .sub1_3_img_col img {
        height: auto;
        object-fit: contain;
    }

    .sub1_3_list_col {
        width: 100%;
    }
}

@media (max-width: 600px) {
    .sub1_3_item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .sub1_3_item_tags {
        margin-left: 0;
    }
}


/* =========================
   sub1_3 섹션 2 : Team Leaders
========================= */
.sub1_3_section_team {
    background-color: var(--background-color);
    padding: clamp(60px, 6vw, 120px) 0 0;
}

.sub1_3_team_photo {
    max-width: 1400px; margin: 0 auto;
}

.sub1_3_team_photo img {
    width: 100%;
    display: block;
}

.sub1_3_section_2 {
    background-color: var(--background-color);
    padding: clamp(60px, 6vw, 120px) 0;
}

.sub1_3_section_2_inner {
    max-width: var(--max-width);
    margin: 0 auto;
}

.sub1_3_team_title {
    font-size: var(--text-font-title-size);
    line-height: var(--text-font-title-size-line);
    font-weight: 400;
    color: var(--base-color-black);
    padding-bottom: clamp(15px, 1.5vw, 25px);
    margin-bottom: clamp(40px, 4vw, 80px);
    border-bottom: 1px solid var(--base-color-black);
}

.sub1_3_team_grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(80px, 7vw, 140px);
}

/* Member card */
.sub1_3_member_header {
    margin-bottom: clamp(20px, 2vw, 30px);
}

.sub1_3_member_role {
    display: block;
    font-size: var(--text-font-size);
    line-height: var(--text-font-size-line);
    color: var(--base-color-black);
    margin-bottom: 4px;
}

.sub1_3_member_name {
    font-size: var(--text-font-title-size);
    line-height: var(--text-font-title-size-line);
    font-weight: 700;
    color: var(--base-color-black);
}

.sub1_3_member_img {
    width: 100%;
    max-width: 350px;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    margin-bottom: clamp(20px, 2vw, 30px);
}

.sub1_3_member_img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.sub1_3_member_career {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sub1_3_member_career li {
    font-size: var(--text-font-size);
    line-height: 2;
    color: var(--base-color-black);
}

/* 반응형 */
@media (max-width: 1024px) {
    .sub1_3_team_grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .sub1_3_member {
        text-align: center;
    }

    .sub1_3_member_img {
        margin: 0 auto clamp(20px, 2vw, 30px);
    }
}

@media (max-width: 600px) {
    .sub1_3_team_grid {
        grid-template-columns: 1fr;
    }
}


/* =========================
   sub1_3 섹션 3 : RAUM Team
========================= */
.sub1_3_section_3 {
    background-color: var(--background-color);
    padding: clamp(60px, 6vw, 120px) 0;
}

.sub1_3_section_3_inner {
    max-width: var(--max-width);
    margin: 0 auto;
}

.sub1_3_staff_grid {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: clamp(30px, 4vw, 60px) clamp(30px, 7vw, 140px);
}

.sub1_3_staff {
    width: calc((100% - clamp(30px, 7vw, 140px) * 2) / 3);
}

/* Staff card */
.sub1_3_staff {
    text-align: center;
}

.sub1_3_staff_img {
    width: 100%;
    max-width: 350px;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    margin: 0 auto clamp(15px, 1vw, 20px);
}

.sub1_3_staff_img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.sub1_3_staff_name {
    font-size: var(--text-font-size);
    line-height: var(--text-font-size-line);
    font-weight: 600;
    color: var(--base-color-black);
    margin-bottom: 4px;
}

.sub1_3_staff_role {
    display: block;
    font-size: var(--text-font-size);
    line-height: var(--text-font-size-line);
    color: var(--base-color-black);
    font-weight: 400;
}

/* 반응형 */
@media (max-width: 600px) {
    .sub1_3_staff {
        width: calc((100% - clamp(30px, 7vw, 140px)) / 2);
    }
}


/* =========================
   sub4_2 섹션 1 : E-Broshure
========================= */
.sub4_2_section_1 {
    width: 100%;
}

.sub4_2_inner {
    position: relative;
    overflow: hidden;
    display: flex;
    min-height: 50vh;
    padding: 0;
    margin: clamp(80px, 7vw, 200px) auto;
}

.sub4_2_bg_img {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.sub4_2_bg_img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Left column */
.sub4_2_left {
    width: 50%;
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
}

.sub4_2_left_content {
    width: 100%;
    height: 100%;
    padding: clamp(30px, 4vw, 60px);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background-color: #ffffff9a;
    backdrop-filter: blur(10px);
}

.sub4_2_arrows {
    display: flex;
    gap: 10px;
}

.sub4_2_arrow {
    width: clamp(44px, 3.5vw, 60px);
    height: clamp(44px, 3.5vw, 60px);
    border-radius: 50%;
    border: none;
    background: var(--signature-color);
    font-size: clamp(16px, 1.4vw, 22px);
    cursor: pointer;
    transition: opacity 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    
    span {
        color: var(--base-color-white);
        font-family: 700;
    }
}

.sub4_2_wrap {
    margin: 0 clamp(20px, 2.6042vw, 50px);
}

.sub4_2_arrow:hover {
    opacity: 0.7;
}

.sub4_2_arrow:hover {
}

.sub4_2_text {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sub4_2_label {
    font-size: var(--title-point-font-size);
    color: var(--base-color-black);
    font-weight: 700;
}

.sub4_2_title {
    font-size: var(--sub-title-font-size);
    line-height: var(--sub-title-font-size-line);
    color: var(--base-color-black);
    font-weight: 700;
    padding-bottom: clamp(15px, 1.5vw, 60px);
    border-bottom: 1px solid var(--base-color-black);
}

.sub4_2_download_link {
    font-size: var(--text-font-size);
    color: var(--base-color-white);
    font-weight: 600;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.sub4_2_download_link:hover {
    opacity: 0.6;
}

.sub4_2_download_ico {
    width: clamp(14px, 1vw, 18px);
    height: auto;
    vertical-align: middle;
    margin-left: 6px;
}

/* Right column */
.sub4_2_right {
    width: 50%;
    position: relative;
    z-index: 1;
    margin-right: 15px;
}

/* 반응형 */
@media (max-width: 1024px) {
    .sub4_2_inner {
        flex-direction: column;
        min-height: auto;
        padding: 0;
    }

    .sub4_2_arrows {
        justify-content: flex-end;
    }

    .sub4_2_left {
        width: 100%;
    }

    .sub4_2_right {
        width: 100%;
        min-height: 30vh;
    }

    .sub4_2_download_link {
        padding-top: clamp(15px, 1.5vw, 60px);
    }
}


/* =========================
   sub3_1 섹션 1 : LAUM LAB
========================= */
.sub3_1_section_1 {
    padding: clamp(80px, 8vw, 140px) 0;
    width: 100%;
}

.sub3_1_section_1_inner {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.sub3_1_header {
    text-align: center;
    margin-bottom: clamp(40px, 4vw, 70px);
}

.sub3_1_title {
    font-size: var(--sub-title-font-size);
    line-height: var(--sub-title-font-size-line);
    font-weight: 700;
    color: var(--base-color-darkblack);
    margin-bottom: clamp(15px, 1.5vw, 25px);
}

.sub3_1_desc {
    font-size: var(--text-font-size);
    line-height: var(--text-font-size-line);
    color: var(--base-color-sub-black);
    word-break: keep-all;
}

.sub3_1_img {
    width: 100%;
    margin-bottom: clamp(40px, 4vw, 70px);
}

.sub3_1_img img {
    width: 100%;
    display: block;
    object-fit: cover;
}

.sub3_1_vm {
    width: 100%;
    display: flex;
}

.sub3_1_vm_item {
    flex: 1;
    text-align: center;
}

.sub3_1_vm_item + .sub3_1_vm_item {
    border-left: 1px solid #C0C0C0;
}

.sub3_1_vm_label {
    font-size: var(--text-font-title-size);
    line-height: var(--text-font-title-size-line);
    font-weight: 700;
    color: var(--base-color-black);
    margin-bottom: clamp(10px, 1vw, 18px);
}

.sub3_1_vm_text {
    font-size: var(--text-font-size);
    line-height: var(--text-font-size-line);
    color: var(--base-color-sub-black);
    word-break: keep-all;
}

@media (max-width: 600px) {
    .sub3_1_vm {
        flex-direction: column;
        gap: clamp(40px, 5vw, 60px);
    }

    .sub3_1_vm_item + .sub3_1_vm_item {
        border-left: none;
    }
}


/* =========================
   sub3_1 섹션 2 : Content
========================= */
.sub3_1_section_2 {
    padding: clamp(60px, 6vw, 120px) 0;
    width: 100%;
}

.sub3_1_con_title {
    font-size: var(--text-font-title-size);
    line-height: var(--text-font-title-size-line);
    font-weight: 400;
    color: var(--base-color-black);
    text-align: center;
    margin-bottom: clamp(120px, 12vw, 200px);
}

.sub3_1_con_grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(50px, 6vw, 100px);
}

.sub3_1_con_card {
    display: flex;
    flex-direction: column;
}

.sub3_1_con_img_wrap {
    position: relative;
    margin-bottom: clamp(35px, 3.5vw, 55px);
}

/* 정사각형 꾸밈 박스 */
.sub3_1_con_img_wrap::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 75%;
    aspect-ratio: 1 / 1;
    background-color: #C0C0C0;
    z-index: 0;
    pointer-events: none;
}

.sub3_1_con_num {
    position: absolute;
    top: 0;
    right: 0;
    font-size: clamp(50px, 5vw, 90px);
    font-weight: 700;
    color: #C0C0C0;
    line-height: 1;
    z-index: 1;
    pointer-events: none;
    transform: translateY(-87%);
}

.sub3_1_con_img {
    position: relative;
    z-index: 2;
    width: 85%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    margin-top: 15%;
}

.sub3_1_con_img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.sub3_1_con_name {
    font-size: var(--text-font-title-size);
    line-height: var(--text-font-title-size-line);
    font-weight: 700;
    color: var(--signature-color);
    margin-bottom: clamp(8px, 0.8vw, 14px);
}

.sub3_1_con_name::before {
    content: '';
    display: block;
    width: 80px;
    height: 8px;
    background-color: var(--signature-color);
    margin-bottom: clamp(12px, 1.2vw, 20px);
}

.sub3_1_con_desc {
    font-size: var(--text-font-size);
    line-height: var(--text-font-size-line);
    color: var(--base-color-sub-black);
    word-break: keep-all;
}

@media (max-width: 768px) {
    .sub3_1_con_grid {
        grid-template-columns: 1fr;
        gap: clamp(60px, 10vw, 100px);
    }

    .sub3_1_con_img {
        width: 90%;
    }
}


/* =========================
   sub3_1 섹션 3 : 인증서 게시판
========================= */
.sub3_1_section_3 {
    padding: clamp(60px, 6vw, 120px) 0;
    width: 100%;
}


/* =========================
   sub3_2 섹션 1 : Adding technology
========================= */
.sub3_2_section_1 {
    padding: clamp(80px, 8vw, 140px) 0;
    width: 100%;
}

.sub3_2_section_1_inner {
    display: flex;
    align-items: flex-start;
    gap: clamp(40px, 5vw, 100px);
}

.sub3_2_text {
    flex-shrink: 0;
    width: 35%;
}

.sub3_2_title {
    font-size: var(--sub-title-font-size);
    font-weight: 600;
    color: var(--base-color-black);
    margin-bottom: clamp(25px, 2.5vw, 40px);
}

.sub3_2_desc {
    display: flex;
    flex-direction: column;
    gap: clamp(12px, 1.2vw, 20px);
    margin-bottom: clamp(30px, 3vw, 50px);
}

.sub3_2_desc p {
    font-size: var(--text-font-size-s);
    line-height: 1.7;
    color: var(--base-color-sub-black);
}

.sub3_2_link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: var(--text-font-size-s);
    font-weight: 600;
    color: var(--signature-color) !important;
    text-decoration: none;
    transition: opacity 0.3s ease;

    span {
        color: var(--signature-color);
        font-weight: 600;
    }
}

.sub3_2_link:hover {
    opacity: 0.6;
}

.sub3_2_images {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.sub3_2_images img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.sub3_2_images::after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 100%;
    background-color: var(--background-color);
}

@media (max-width: 1024px) {
    .sub3_2_section_1_inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .sub3_2_text {
        width: 100%;
    }
}