@media screen and (max-width: 1600px) {
  .inner {
    max-width: 1280px;
  }
  header .gnb a {
    font-size: 1.7rem;
  }
  .intro .sub-title {
    margin-top: 5rem;
    font-size: 4.4rem;
  }
  .intro .title {
    font-size: 12rem;
  }
  .intro .desc {
    margin: 3.1rem 0 8.1rem;
    font-size: 2.4rem;
  }
  .intro .detail-info {
    margin-bottom: 6.5rem;
    font-size: 2.1rem;
  }
  .intro button {
    width: 30rem;
    height: 7.8rem;
    font-size: 2.1rem;
  }
  .intro button i {
    font-size: 2rem;
  }
  .history .detail {
    font-size: 2.6rem;
  }
  .history .container {
    column-gap: 12.1rem;
    margin-top: 9.3rem;
  }
  .history .period {
    font-size: 7.45rem;
  }
  .history .history-item .year {
    font-size: 2.6rem;
    height: 3.6rem;
    line-height: 3.6rem;
  }
  .history .history-item .content {
    font-size: 2rem;
  }
  .inquiry p {
    font-size: 2.2rem;
  }
  .inquiry a {
    column-gap: 0.8rem;
    padding: 2.2rem 6.4rem 2rem;
    font-size: 2.2rem;
  }
  .partners .title {
    font-size: 4.6rem;
  }
  .inquiry-form .content {
    column-gap: 15rem;
  }
  .conference .content {
    column-gap: 11.6rem;
  }
}

@media screen and (max-width: 1400px) {
  .inner {
    max-width: 1170px;
  }
  header .gnb {
    column-gap: 6.2rem;
  }
  header .gnb a {
    font-size: 1.6rem;
  }
  .intro .sub-title {
    margin-top: 4rem;
    font-size: 4.2rem;
  }
  .intro .title {
    font-size: 10rem;
  }
  .intro .desc {
    margin: 2.1rem 0 6.1rem;
    font-size: 2.1rem;
  }
  .intro .detail-info {
    margin-bottom: 5.5rem;
    font-size: 1.7rem;
  }
  .intro button {
    width: 28rem;
    height: 6.8rem;
    font-size: 1.8rem;
  }
  .intro button i {
    margin-left: 1rem;
    font-size: 1.7rem;
  }
  .conference-intro {
    padding: 11.7rem 0 12.2rem;
    background: #fff;
  }
  .conference-intro .title {
    margin-bottom: 5.2rem;
    font-size: 4rem;
  }
  .history .title {
    font-size: 4.6rem;
  }
  .history .detail {
    margin-top: 4.5rem;
    font-size: 2.4rem;
  }
  .history .container {
    margin-top: 8.3rem;
  }
  .history .period {
    font-size: 6.45rem;
  }
  .history .history-item {
    height: 9.5rem;
  }
  .history .history-item .year {
    font-size: 2.4rem;
    height: 3.4rem;
    line-height: 3.4rem;
  }
  .history .history-item .content {
    font-size: 1.8rem;
  }
  .inquiry {
    padding: 7.3rem 0 8.3rem;
  }
  .inquiry .title {
    font-size: 3.8rem;
  }
  .inquiry p {
    font-size: 2rem;
  }
  .inquiry a {
    padding: 2.1rem 6.2rem 1.9rem;
    font-size: 2rem;
  }
  .partners {
    padding: 9.4rem 0 12.9rem;
  }
  .partners .title {
    font-size: 4.4rem;
  }
  .partners .partner-list {
    margin-top: 6.2rem;
  }
  .sub-intro .content {
    padding: 6.7rem 0 13.7rem;
  }
  .sub-intro .content .title {
    margin-top: 2.2rem;
    font-size: 5.4rem;
  }
  .inquiry-form {
    padding: 12.6rem 0 10.6rem;
  }
  .inquiry-form .content {
    column-gap: 10rem;
  }
  .inquiry-form .title {
    font-size: 3.8rem;
  }
  .inquiry-form .desc span {
    font-size: 1.8rem;
  }
  .inquiry-form form label {
    font-size: 1.6rem;
  }
  .inquiry-form form textarea {
    height: 18.6rem;
  }
  .inquiry-form form input,
  .inquiry-form form textarea {
    font-size: 1.6rem;
    padding: 2.2rem 2.1rem;
  }
  .inquiry-form form .helper-text {
    font-size: 1.6rem;
  }
  .inquiry-form button {
    height: 7rem;
    margin-top: 2.2rem;
    font-size: 2rem;
  }
  .conference {
    padding: 13.8rem 0 17.3rem;
  }
  .conference .title {
    margin-bottom: 9.5rem;
    font-size: 4.6rem;
  }
  .conference .content {
    column-gap: 10.6rem;
  }
  .conference .img-title {
    margin-top: 4.3rem;
    font-size: 2.4rem;
  }
  .conference .img-detail {
    margin-top: 2.5rem;
    font-size: 2rem;
  }
  .conference .img-box {
    border-radius: 2rem;
  }
  .gallery {
    padding: 11.8rem 0 15rem;
  }
  .gallery .title {
    margin-bottom: 5.4rem;
    font-size: 4.4rem;
  }
  .gallery .marquee-reverse {
    margin-top: 3rem;
  }
  .gallery .marquee-box img {
    width: 42rem;
    height: 28.5rem;
    margin: 0 1.2rem;
    border-radius: 2rem;
  }
  .request-form {
    padding: 9rem 0 7.8rem;
  }
  .request-form .title {
    font-size: 3rem;
  }
  .request-form .title strong::before {
    height: 1.7rem;
  }
  .request-form .sub-title {
    margin-top: 3rem;
    font-size: 2.2rem;
  }
  .request-form .small-text {
    margin-top: 1.2rem;
    font-size: 1.7rem;
  }
  .request-form .content {
    margin-top: 5.2rem;
    padding: 6.7rem 8.5rem 9rem;
  }
  .request-form .form-title {
    margin-bottom: 3.5rem;
    font-size: 2.5rem;
  }
  .request-form .form-title .important-text {
    font-size: 1.8rem;
  }
  .request-form button {
    height: 7rem;
    margin-top: 2.2rem;
    font-size: 2rem;
  }
  .request-form .sub-text {
    margin-top: 5.7rem;
    font-size: 1.8rem;
  }
  .show-collection {
    padding: 0 3.3rem 6rem;
  }
  footer .info .footer-links {
    font-size: 1.4rem;
  }
  footer .info p {
    font-size: 1.2rem;
    margin-bottom: 0.4rem;
  }
  footer .social a {
    width: 5rem;
    height: 5rem;
    font-size: 2.4rem;
  }
  footer .social small {
    font-size: 1.2rem;
  }
}

@media screen and (max-width: 1280px) {
  .inner {
    max-width: 1080px;
  }
  .intro .sub-title {
    font-size: 4rem;
  }
  .intro .title {
    height: 9rem;
    font-size: 9rem;
  }
  .intro .desc {
    margin: 1.9rem 0 5.7rem;
    font-size: 1.9rem;
  }
  .intro .detail-info {
    font-size: 1.6rem;
  }
  .intro .detail-info span::before {
    width: 0.4rem;
    height: 1.7rem;
  }
  .intro button {
    width: 24rem;
    height: 6.5rem;
    font-size: 1.6rem;
  }
  .intro button i {
    margin-left: 0.9rem;
    font-size: 1.5rem;
  }
  .conference-intro {
    padding: 11rem 0 11.5rem;
  }
  .conference-intro .title {
    margin-bottom: 5rem;
    font-size: 3.8rem;
  }
  .conference-intro .desc span {
    font-size: 1.6rem;
  }
  .history {
    padding: 11.5rem 0 13.2rem;
  }
  .history .title {
    font-size: 4.4rem;
  }
  .history .detail {
    margin-top: 4.2rem;
    font-size: 2.1rem;
  }
  .history .container {
    margin-top: 7.8rem;
  }
  .history .period {
    font-size: 6rem;
  }
  .history .pointer {
    left: -1.15rem;
    width: 2.5rem;
    height: 2.5rem;
  }
  .history .history-item {
    height: 8rem;
  }
  .history .history-item .year {
    font-size: 2.2rem;
    height: 3.2rem;
    line-height: 3.2rem;
  }
  .history .history-item .content {
    font-size: 1.6rem;
  }
  .inquiry {
    padding: 6.8rem 0 7.8rem;
  }
  .inquiry .title {
    font-size: 3.4rem;
  }
  .inquiry p {
    font-size: 1.8rem;
  }
  .inquiry a {
    padding: 1.9rem 6rem 1.7rem;
    font-size: 1.8rem;
  }
  .partners {
    padding: 9rem 0 11.4rem;
  }
  .partners .title {
    font-size: 4.2rem;
  }
  .partners .sm-text {
    margin-top: 2rem;
    font-size: 1.8rem;
  }
  .partners .partner-list {
    margin-top: 5.2rem;
  }
}

@media screen and (max-width: 1024px) {
  .inner {
    max-width: calc(100% - 3rem);
  }
  header {
    padding: 2.2rem 0;
  }
  header .gnb {
    column-gap: 5.4rem;
  }
  header .gnb a {
    font-size: 1.5rem;
  }
  .intro button + button {
    margin-left: 1.5rem;
  }
  .history .container {
    column-gap: 7.1rem;
  }
  .conference-intro .title {
    font-size: 3.4rem;
  }
  .sub-intro .content {
    padding: 5.7rem 0 9.7rem;
  }
  .sub-intro .content .title {
    font-size: 4.7rem;
  }
  .inquiry-form {
    padding: 8.6rem 0 9.6rem;
  }
  .inquiry-form .title {
    font-size: 3.2rem;
  }
  .inquiry-form .content {
    column-gap: 5rem;
  }
  .inquiry-form .desc span {
    font-size: 1.8rem;
  }
  .inquiry-form form input,
  .inquiry-form form textarea {
    font-size: 1.6rem;
    padding: 1.7rem 1.8rem;
  }
  .inquiry-form form .helper-text {
    font-size: 1.5rem;
  }
  .conference {
    padding: 10.8rem 0 14.3rem;
  }
  .conference .title {
    margin-bottom: 8.5rem;
    font-size: 4.4rem;
  }
  .conference .content {
    column-gap: 8.6rem;
  }
  .conference .img-title {
    margin-top: 3.7rem;
    font-size: 2.4rem;
  }
  .conference .img-detail {
    margin-top: 2.1rem;
    font-size: 1.8rem;
    word-break: keep-all;
  }
  .conference .img-detail br {
    display: none;
  }
  .gallery {
    padding: 10.5rem 0 14rem;
  }
  .request-form {
    padding: 8.5rem 0 6.3rem;
  }
  .request-form .title {
    font-size: 2.7rem;
  }
  .request-form .sub-title {
    margin-top: 2.5rem;
    font-size: 2rem;
    line-height: 1.27;
  }
  .request-form .small-text {
    margin-top: 1.2rem;
    font-size: 1.6rem;
  }
  .request-form .content {
    margin-top: 4.2rem;
    padding: 5.7rem 5.5rem 8rem;
  }
  .request-form .form-title {
    margin-bottom: 3.5rem;
    font-size: 2.3rem;
  }
  .request-form form input {
    padding: 2.1rem;
    font-size: 1.7rem;
  }
  .request-form form .helper-text {
    margin-top: 1.1rem;
    font-size: 1.6rem;
  }
  .request-form .sub-text {
    margin-top: 4.7rem;
    font-size: 1.7rem;
  }
  .request-form .sub-text .email-address {
    margin-top: 1.6rem;
    font-size: 1.8rem;
  }
  .show-collection {
    padding: 0 3.3rem 4rem;
  }
}

@media screen and (max-width: 920px) {
  .inquiry-form .content {
    flex-direction: column;
  }
}

@media screen and (max-width: 768px) {

  header .gnb { display: none !important; }   /* 데스크톱 GNB 숨김 */
  header .gnb-box { display: block !important; width:40px; height:40px; }

  .intro .bg {
    position: absolute !important;   /* was fixed */
    top: 0; left: 0; width: 100%; height: 100%;
    transform: none !important;
  }
  .intro {
    position: relative;
    min-height: 85vh;
  }
  .intro .content {
    position: relative !important;   /* was fixed */
    top: auto !important;
    display: grid;
    place-items: center;
    padding: 80px 16px 56px;         /* 헤더 영역/버튼 여백 확보 */
    height: auto !important;
  }
  .conference-intro .desc {
    word-break: keep-all;
    line-height: 1.7;
  }

  .pre-partner-item img { 
    max-height: 60px; 
    height: auto;
  }

  .history .history-item .content {
    padding-left: 3.6rem;  /* 원래 5.6rem → 조금 줄여 좌우 여백 확보 */
  }
  
  .intro .title {
    column-gap: 1.5rem;
    height: max-content;
    font-size: 7rem;
  }
  .history .container {
    margin-top: 5.8rem;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    row-gap: 4rem;
  }
  .history .period {
    display: flex;
    font-size: 5.5rem;
  }
  .partners .partner-list {
    grid-template-columns: repeat(3, 1fr);
    margin-top: 6.2rem;
  }
  .sub-intro .content {
    padding: 6.7rem 0 11.7rem;
  }
  .sub-intro .content .title {
    margin-top: 1.8rem;
    font-size: 4.4rem;
  }
  .conference .img-container {
    flex-direction: column;
  }
  .conference .img-container + .img-container {
    margin-top: 10rem;
  }
  .conference .img-group {
    width: 100%;
  }
  .conference .img-group + .img-group {
    margin-top: 10rem;
  }
  .conference .img-title {
    margin-top: 3rem;
    font-size: 2.2rem;
  }
  .conference .img-detail {
    margin-top: 1.8rem;
    font-size: 1.7rem;
  }
  .gallery {
    padding: 9.5rem 0 12rem;
  }
  .gallery .marquee-reverse {
    margin-top: 2.5rem;
  }
  .gallery .marquee-box img {
    width: 32rem;
    height: 21.7rem;
    margin: 0 1rem;
    border-radius: 1.5rem;
  }
  .show-collection .banner {
    padding-bottom: 52.2135%;
  }
  .show-collection .banner a {
    background-image: url("../images/banner/itsite_banner_m.jpg");
  }
  footer .inner {
    flex-wrap: wrap;
    justify-content: center;
    gap: 4rem;
  }
  footer .inner .f-logo {
    width: 100%;
    text-align: center;
  }
  footer .inner * {
    flex-shrink: 0;
  }
}

@media screen and (max-width: 530px) {

  .intro .content .inner button { text-align:center; }

  .intro button {
    width: 90%;
    min-height: 56px;                /* 고정 height → 최소 높이 */
    height: auto;
    padding: 14px 20px;
    font-size: 1.7rem;               /* 글자 크기 소폭 축소 */
    line-height: 1.2;
    display:inline-flex; justify-content:center; align-items:center;
  }
  .intro button i {
    font-size: 1.6rem;
    margin-left: 0.6rem;
  }

  header .gnb {
    display: none;
  }
  header .gnb-box {
    position: relative;
    display: block;
    width: 2.6rem;
    height: 3rem;
  }
  header .gnb-box i {
    position: absolute;
    top: 0;
    right: 0;
    width: auto;
    height: 3rem;
  }
  header .gnb-box .fa-bars {
    opacity: 1;
  }
  header .gnb-box.on .fa-bars {
    opacity: 0;
  }
  header .gnb-box .fa-xmark {
    opacity: 0;
  }
  header .gnb-box.on .fa-xmark {
    opacity: 1;
  }
  .gnb-menu {
    z-index: 10;
    position: fixed;
    top: 7.6rem;
    left: 0;
    width: 100%;
    padding: 2rem 0;
    font-size: 1.8rem;
    color: #fff;
    text-align: center;
    background-color: rgba(14, 14, 14, 0.8);
    transform: translateY(-150%);
    transition: transform 0.3s ease-in-out;
  }
  .gnb-menu div.on a {
    color: #36d929;
  }
  .gnb-menu a {
    display: block;
    padding: 1rem 0;
  }
  .gnb-menu.show {
    transform: translateY(0);
    transition: transform 0.3s ease-in-out;
  }
  .intro button {
    display: block;
    width: 90%;
  }
  .intro button + button {
    margin-top: 1.5rem;
    margin-left: 0rem;
  }
  .conference-intro .desc span br {
    display: none;
  }
  .sub-intro .container {
    padding-top: 7.6rem;
  }
  .sub-intro .content {
    padding: 4.7rem 0 11.7rem;
  }
  .sub-intro .content .title {
    margin-top: 1.2rem;
    font-size: 3rem;
  }
  .inquiry-form .desc span {
    word-break: keep-all;
  }
  .inquiry-form .desc span br {
    display: none;
  }
  .conference {
    padding: 7.8rem 0 10.3rem;
  }
  .conference .title {
    margin-bottom: 5.5rem;
    font-size: 4rem;
  }
  .conference .img-container + .img-container {
    margin-top: 7rem;
  }
  .conference .img-group + .img-group {
    margin-top: 7rem;
  }
  .gallery {
    padding: 8.5rem 0 12rem;
  }
  .gallery .title {
    margin-bottom: 5.4rem;
    font-size: 4rem;
  }
  .request-form {
    padding: 8.5rem 0 5.3rem;
  }
  .request-form .title {
    font-size: 2.1rem;
  }
  .request-form .title strong::before {
    height: 1.2rem;
  }
  .request-form .sub-title {
    margin-top: 2rem;
    font-size: 1.8rem;
  }
  .request-form .small-text {
    margin-top: 1.2rem;
    font-size: 1.6rem;
  }
  .request-form .content {
    margin-top: 4.2rem;
    padding: 4.7rem 3.5rem 6rem;
  }
  .request-form .sub-text {
    margin-top: 3.7rem;
    font-size: 1.6rem;
  }
  .request-form .small-text {
    margin-top: 1.2rem;
    font-size: 1.4rem;
    line-height: 1.27;
  }
  .request-form .content {
    margin-top: 3.2rem;
    padding: 3.7rem 2.7rem 5rem;
  }
  .request-form .form-title {
    margin-bottom: 2.5rem;
    font-size: 2rem;
  }
  .request-form .form-title .important-text {
    font-size: 1.6rem;
  }
  .request-form form label {
    font-size: 1.6rem;
  }
  .request-form form input {
    padding: 1.5rem;
    font-size: 1.6rem;
  }
  .request-form form .helper-text {
    margin-top: 1rem;
    font-size: 1.5rem;
  }
  .request-form form .input-box + .input-box {
    margin-top: 1.7rem;
  }
  .request-form button {
    height: 6rem;
    font-size: 1.7rem;
  }
  .request-form .sub-text {
    margin-top: 3.4rem;
    line-height: 1.27;
  }
  .request-form .sub-text .email-address {
    margin-top: 1.4rem;
    font-size: 1.6rem;
  }
}

@media screen and (max-width: 460px) {
  .intro .detail-info span {
    display: block;
  }
  .intro .detail-info span + span {
    margin-left: 0;
  }
  .history .title,
  .partners .title,
  .conference .title,
  .gallery .title {
    font-size: 3.4rem;
  }
  .conference-intro {
    padding: 9rem 0 9.5rem;
  }
  .conference-intro .title {
    font-size: 3rem;
  }
  .conference-intro .title br {
    display: none;
  }
  .conference-intro .title strong::before {
    height: 1.5rem;
  }
  .history .period {
    font-size: 4.5rem;
  }
  .history .history-group .line {
    position: absolute;
    left: calc(7.15rem + 1.9rem + 0.35rem);
  }
  .history .pointer {
    left: -1.25rem;
  }
  .history .history-item .content {
    width: calc(100% - 13.5rem);
    margin-left: 1.9rem;
    padding-left: 4.6rem;
  }
  .partners .title {
    line-height: 1.14;
  }
  .partners .partner-list {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 1rem;
    row-gap: 1.1rem;
  }
  .inquiry-form {
    padding: 7.6rem 0 8.6rem;
  }
  .inquiry-form .title strong::before {
    height: 1.5rem;
  }
  .gallery {
    padding: 8.5rem 0 10rem;
  }
  .show-collection {
    padding: 0 1.5rem 2.5rem;
  }
  .request-form {
    padding: 6.5rem 0 5.3rem;
  }
  footer {
    padding: 3.6rem 0 5.6rem;
  }
  footer .inner {
    gap: 3rem;
  }
  footer .inner .info,
  footer .inner .social {
    text-align: center;
  }
}

@media (min-width: 769px) {
  .pre-pre-partners { padding: 16px 0; }
  .pre-pre-partners .inner {
    max-width: none !important;  /* 이전 clamp 상한 제거 */
    width: 90%;
    margin: 0 auto;
    padding-left: max(16px, 3vw);
    padding-right: max(16px, 3vw);
    overflow: hidden;            /* 트랙은 길어도 보이는 창만 제한 */
    position: relative;
  }
  .pre-partner-list {
    gap: clamp(16px, 2vw, 32px); /* 큰 화면에서는 간격도 유동 */
    padding: 0;
  }
  .pre-partner-item img {
    height: clamp(48px, 5.5vw, 80px); /* 로고 과대 방지(80px 상한) */
    width: auto;
    object-fit: contain;
  }
}

/* Mobile: 스크롤/스냅 유지 + 좌우 여백 일관화 */
@media (max-width: 768px) {
  .pre-pre-partners { padding: 12px 0; }
  .pre-pre-partners .inner {
    max-width: 100%;
    margin: 0 auto;
    overflow: hidden;
  }
  .pre-partner-list {
    padding: 0 16px;                       /* 모바일 좌우 여백 */
  }
}

/* ===== History .content .content-s — mobile optimizations ===== */
@media (max-width: 768px) {
  .history .history-item .content .content-s {
    display: block;
    font-size: clamp(14px, 3.8vw, 17px); /* 기존 2.1rem≈21px → 축소 */
    line-height: 1.6;
    letter-spacing: -0.01em;
    word-break: keep-all;               /* 한글 줄바꿈 안정화 */
    margin-top: 0.4rem;
  }
  /* 긴 항목은 고정 높이 해제해 자연스러운 줄바꿈 허용 */
  .history .history-item.longw { height: auto; }
}

@media (max-width: 480px) {
  .history .history-item .content .content-s {
    font-size: clamp(13px, 4.2vw, 16px);
    line-height: 1.55;
    margin-top: 0.3rem;
  }
}