@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;500;600;700&display=swap");

/* 메인 홈페이지 스무스 스크롤 (섹션 간 부드러운 전환) */
html {
  scroll-behavior: smooth;
}

/* =========================================
   동아리 소개 애니메이션 (묵직하고 느리게, 최초 1회)
========================================= */
.reveal-dramatic {
  opacity: 0;
  transform: translateY(150px);
  transition: opacity 1.5s ease-out, transform 1.8s cubic-bezier(0.1, 1, 0.3, 1);
  will-change: opacity, transform;
}
.reveal-dramatic.is-visible {
  opacity: 1;
  transform: translateY(0);
}

body {
  font-family: "Noto Sans KR", sans-serif;
  color: #0c0c0c;
  background-color: #ffffff;
  overflow-x: hidden;
}

.layout_padding {
  padding: 90px 0;
}

.layout_padding2 {
  padding: 75px 0;
}

.layout_padding2-top {
  padding-top: 75px;
}

.layout_padding2-bottom {
  padding-bottom: 75px;
}

.layout_padding-top {
  padding-top: 90px;
}

.layout_padding-bottom {
  padding-bottom: 90px;
}

.heading_container {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-align: start;
      -ms-flex-align: start;
          align-items: flex-start;
}

.heading_container h2 {
  position: relative;
  font-weight: 700;
  font-size: 2rem;
  margin-bottom: 0;
}

.heading_container h2 span {
  color: #3866d1;
}

.heading_container p {
  margin-top: 10px;
  margin-bottom: 0;
}

.heading_container.heading_center {
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  text-align: center;
}

a,
a:hover,
a:focus {
  text-decoration: none;
}

a:hover,
a:focus {
  color: initial;
}

.btn,
.btn:focus {
  outline: none !important;
  -webkit-box-shadow: none;
          box-shadow: none;
}

/*header section*/
.hero_area {
  position: relative;
  min-height: 100vh;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
}

/* (히어로 배경 이미지 코드는 기존과 동일하게 유지) */
.hero_area .hero_bg_box {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: end;
      -ms-flex-align: end;
          align-items: flex-end;
  overflow: hidden;
  z-index: -1;
}

.hero_area .hero_bg_box .bg_img_box {
  min-width: 100%;
  min-height: 100%;
}

.hero_area .hero_bg_box img {
  min-width: 100%;
  min-height: 100%;
}

.sub_page .hero_area {
  position: relative;
  min-height: 200px;
  padding-top: 60px;
  background: #0a0a43;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* 서브페이지: hero_bg_box 이미지 표시 */
.sub_page .hero_area .hero_bg_box {
  display: flex;
}

.sub_page .hero_area .hero_bg_box img {
  object-fit: cover;
  object-position: top;
  min-width: 100%;
  min-height: 100%;
}


/* 서브페이지(배너 제거 모드): 메뉴만 남기고 파란 배너 영역 제거 */
.sub_page.no_banner .hero_area {
  min-height: 0;
  padding-top: 0;
  background: transparent;
  justify-content: flex-start;
}

.sub_page.no_banner .hero_area .hero_bg_box {
  display: none;
}

.sub_page.no_banner .page-banner-title {
  display: none;
}

/* 배너를 없애도 상단 메뉴 가독성 유지 */
.sub_page.no_banner .header_section {
  background-color: rgba(10, 10, 67, 1);
}

/* 서브페이지 배너 타이틀 */
.sub_page .page-banner-title {
  position: relative;
  z-index: 1;
  text-align: center;
  color: #fff;
}

.sub_page .page-banner-title h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: 2px;
}

.sub_page .page-banner-title p {
  font-size: 0.9rem;
  opacity: 0.75;
  margin: 0;
}

/* 고정 헤더 */
.header_section {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1030;
  padding: 5px 0;
  background-color: rgba(10, 10, 67, 0);
  transition: background-color 0.1s linear;
}

.header_section.scrolled {
  background-color: rgba(10, 10, 67, 1);
}

.sub_page .header_section {
  padding: 5px 0;
}

.header_section .container-fluid {
  padding-right: 25px;
  padding-left: 25px;
}

.navbar-brand span {
  font-weight: bold;
  font-size: 24px;
  color: #ffffff;
}

.custom_nav-container {
  padding: 0;
}

.custom_nav-container .navbar-nav {
  margin-left: auto;
}

/* =========================================
   1. 기본 메뉴 부드러운 언더라인 효과 복구
========================================= */
.custom_nav-container .navbar-nav .nav-item { 
  position: relative; 
}

.custom_nav-container .navbar-nav .nav-item .nav-link {
  padding: 5px 20px; 
  color: #ffffff; 
  text-align: center; 
  text-transform: uppercase;
  border-radius: 5px; 
  transition: all 0.3s;
}

/* 밑줄 기본 상태 (가운데에 점처럼 숨어있음) */
.custom_nav-container .navbar-nav .nav-item .nav-link::after {
  content: ""; 
  position: absolute; 
  bottom: 0; 
  left: 50%; 
  width: 0; 
  height: 2px;
  background: #3866d1; 
  transform: translateX(-50%); 
  transition: width 0.3s ease-in-out;
}

/* 마우스 올렸을 때 파란 글자 + 밑줄 쫙 늘어남 */
.custom_nav-container .navbar-nav .nav-item:hover .nav-link, 
.custom_nav-container .navbar-nav .nav-item.active .nav-link { 
  color: #3866d1; 
}
.custom_nav-container .navbar-nav .nav-item:hover .nav-link::after,
.custom_nav-container .navbar-nav .nav-item.active .nav-link::after { 
  width: calc(100% - 40px); 
}
.custom_nav-container .navbar-nav .nav-item.active .nav-link { 
  font-weight: 600; 
}

.custom_nav-container .nav_search-btn { width: 35px; height: 35px; padding: 0; border: none; color: #ffffff; }
.custom_nav-container .nav_search-btn:hover { color: #3866d1; }
.custom_nav-container .navbar-toggler { outline: none; padding: 0; width: 37px; height: 42px; -webkit-transition: all 0.3s; transition: all 0.3s; }
.custom_nav-container .navbar-toggler span { display: block; width: 35px; height: 4px; background-color: #ffffff; margin: 7px 0; -webkit-transition: all 0.3s; transition: all 0.3s; position: relative; border-radius: 5px; }
.custom_nav-container .navbar-toggler span::before, .custom_nav-container .navbar-toggler span::after { content: ""; position: absolute; left: 0; height: 100%; width: 100%; background-color: #ffffff; top: -10px; border-radius: 5px; -webkit-transition: all 0.3s; transition: all 0.3s; }
.custom_nav-container .navbar-toggler span::after { top: 10px; }
.custom_nav-container .navbar-toggler[aria-expanded="true"] { -webkit-transform: rotate(360deg); transform: rotate(360deg); }
.custom_nav-container .navbar-toggler[aria-expanded="true"] span { -webkit-transform: rotate(45deg); transform: rotate(45deg); }
.custom_nav-container .navbar-toggler[aria-expanded="true"] span::before, .custom_nav-container .navbar-toggler[aria-expanded="true"] span::after { -webkit-transform: rotate(90deg); transform: rotate(90deg); top: 0; }


/* =========================================
   2. 하위 메뉴(드롭다운) 반투명 글래스모피즘 복구
========================================= */
.navbar-nav .nav-item ul {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translate(-50%, 15px); /* 살짝 아래에서 대기 */
  
  background-color: rgba(10, 10, 67, 0.95); /* ARGOS 남색 베이스 반투명 */
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  
  list-style-type: none;
  padding: 10px 0;
  margin: 0;
  width: max-content;
  min-width: 160px;
  text-align: center;
  border-radius: 12px;
  box-shadow: 0 15px 35px rgba(0,0,0,0.2);
  border: 1px solid rgba(255,255,255,0.08);
  z-index: 999;
  
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* 마우스 내릴 때 창이 사라지는 문제 해결 (투명한 다리 생성) */
.navbar-nav .nav-item ul::before {
  content: '';
  position: absolute;
  top: -20px;
  left: 0;
  width: 100%;
  height: 20px;
}

/* 마우스를 올렸을 때 드롭다운 등장 */
.navbar-nav .nav-item:hover ul,
.navbar-nav .nav-item.active:hover ul { 
  visibility: visible;
  opacity: 1;
  transform: translate(-50%, 5px); /* 위로 살짝 올라오며 안착 */
}

/* 드롭다운 안의 개별 메뉴 디자인 */
.navbar-nav .nav-item ul li a.nav-link { 
  color: #e0e0e0 !important; 
  padding: 10px 20px !important; 
  text-transform: uppercase !important; 
  border-radius: 8px !important; 
  transition: all 0.2s ease !important;
  font-size: 14px;
  margin: 0 10px;
  display: block; 
}

/* 드롭다운 하위 메뉴 호버 시 박스 배경색 변경 */
.navbar-nav .nav-item ul li a.nav-link:hover { 
  color: #ffffff !important; 
  background-color: rgba(255, 255, 255, 0.1) !important; 
}

/* 하위 메뉴에는 파란색 밑줄 안 생기게 차단 */
.custom_nav-container .navbar-nav .nav-item ul li a.nav-link::after {
  display: none !important;
}

/*end header section*/
/* slider section */
.slider_section {
  padding-top: 60px;
  -webkit-box-flex: 1;
      -ms-flex: 1;
          flex: 1;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  position: relative;
  padding: 45px 0 145px 0;
}

.slider_section .row {
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

.slider_section #customCarousel1 {
  width: 100%;
  position: unset;
}

.slider_section .detail-box {
  color: #00204a;
}

.slider_section .detail-box .slider_subtitle {
  color: #ffffff;
  font-size: 1.4rem;
  font-weight: 500;
}

.slider_section .detail-box h1 {
  font-size: 7rem;
  font-weight: bold;
  text-transform: uppercase;
  margin-bottom: 15px;
  color: #ffffff;
}

.slider_section .detail-box p {
  color: #fefefe;
  font-size: 14px;
}

.slider_section .detail-box .btn-box {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  margin: 0 -5px;
  margin-top: 25px;
}

.slider_section .detail-box .btn-box a {
  margin: 5px;
  text-align: center;
  width: 165px;
}

.slider_section .detail-box .btn-box .btn1 {
  display: inline-block;
  padding: 10px 15px;
  background-color: #3866d1;
  color: #ffffff;
  border-radius: 8px;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  border: none;
}

.slider_section .detail-box .btn-box .btn1:hover {
  background-color: #007fa4;
}

.slider_section .detail-box .btn-box .btn2 {
  display: inline-block;
  padding: 10px 15px;
  background-color: #000000;
  color: #ffffff;
  border-radius: 8px;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  border: none;
}

.slider_section .detail-box .btn-box .btn2:hover {
  background-color: black;
}

.slider_section .img-box {
  margin: 45px 0;
}

.slider_section .img-box img {
  width: 100%;
  -webkit-animation: upDown 4s infinite;
          animation: upDown 4s infinite;
}

@-webkit-keyframes upDown {
  0% {
    -webkit-transform: translateY(-25px);
            transform: translateY(-25px);
  }
  50% {
    -webkit-transform: translateY(25px);
            transform: translateY(25px);
  }
  100% {
    -webkit-transform: translateY(-25px);
            transform: translateY(-25px);
  }
}

@keyframes upDown {
  0% {
    -webkit-transform: translateY(-25px);
            transform: translateY(-25px);
  }
  50% {
    -webkit-transform: translateY(25px);
            transform: translateY(25px);
  }
  100% {
    -webkit-transform: translateY(-25px);
            transform: translateY(-25px);
  }
}

.slider_section .carousel-indicators {
  position: unset;
  margin: 0;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

.slider_section .carousel-indicators li {
  background-color: #ffffff;
  width: 12px;
  height: 12px;
  border-radius: 100%;
  opacity: 1;
}

.slider_section .carousel-indicators li.active {
  width: 20px;
  height: 20px;
  background-color: #3866d1;
}

.conferences_section {
  position: relative;
  background: linear-gradient(180deg, #f8f9fc 0%, #ffffff 30%, #ffffff 100%);
  color: #00204a;
}

.conferences_section .heading_container {
  margin-bottom: 50px;
}

.conferences_section .conferences_lead {
  margin-top: 12px;
  font-size: 1.05rem;
  color: #5a6a7e;
  font-weight: 400;
}

.conferences_container {
  margin-top: 0;
}

.conference_card_wrap {
  margin-bottom: 24px;
}

.conference_card_wrap:last-child {
  margin-bottom: 0;
}

@media (min-width: 576px) {
  .conference_card_wrap:nth-last-child(-n+2) {
    margin-bottom: 0;
  }
}

@media (min-width: 992px) {
  .conference_card_wrap {
    margin-bottom: 0;
  }
}

.conference_card {
  display: block;
  height: 100%;
  padding: 0;
  background: #ffffff; 
  border: 1px solid #e1e8ed; 
  border-radius: 16px;
  text-align: center;
  color: #001c3d; 
  text-decoration: none;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05); 
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
}

.conference_card:hover {
  border-color: rgba(56, 102, 209, 0.35);
  -webkit-transform: translateY(-6px);
          transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0, 32, 74, 0.12);
  color: #00204a;
}

.conference_card_img {
  width: 100%;
  height: 120px;
  margin: 0;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  background: rgba(56, 102, 209, 0.06);
  padding: 16px;
  -webkit-transition: background 0.3s ease;
  transition: background 0.3s ease;
}

.conference_card:hover .conference_card_img {
  background: rgba(56, 102, 209, 0.12);
}

.conference_card_img img {
  width: auto;
  height: 100%;
  max-width: 100%;
  -o-object-fit: contain;
     object-fit: contain;
  -webkit-transition: -webkit-transform 0.3s ease;
  transition: transform 0.3s ease;
}

.conference_card:hover .conference_card_img img {
  -webkit-transform: scale(1.05);
          transform: scale(1.05);
}

.conference_card h5 {
  padding-top: 18px;
  padding-left: 16px;
  padding-right: 16px;
}

.conference_card p {
  padding-left: 16px;
  padding-right: 16px;
}

.conference_card_more {
  display: block;
  padding-bottom: 22px;
}

.conference_card > h5 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  position: relative;
  padding-bottom: 10px;
}

.conference_card h5::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  -webkit-transform: translateX(-50%);
          transform: translateX(-50%);
  width: 36px;
  height: 3px;
  background: #3866d1;
  border-radius: 2px;
}

.conference_card > p {
  font-size: 0.9rem;
  line-height: 1.55;
  margin-bottom: 14px;
  color: #5a6a7e;
}

.conference_card_more {
  font-size: 0.85rem;
  color: #3866d1;
  font-weight: 600;
  display: inline-block;
  -webkit-transition: color 0.2s ease;
  transition: color 0.2s ease;
}

.conference_card:hover .conference_card_more {
  color: #007fa4;
}

.conferences_btn_wrap {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  margin-top: 48px;
}

.conference_btn {
  display: inline-block;
  padding: 12px 40px;
  background-color: #3866d1;
  color: #ffffff;
  border-radius: 8px;
  font-weight: 600;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
  border: none;
  text-decoration: none;
}

.conference_btn:hover {
  background-color: #007fa4;
  color: #ffffff;
  -webkit-transform: translateY(-2px);
          transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 102, 209, 0.3);
}

.about_section {
  background-color: #ffffff;
  color: #00204a;
}

.about_section .heading_container {
  margin-bottom: 45px;
}

.about_section .row {
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

.about_section .img-box img {
  max-width: 100%;
}

.about_section .detail-box h3 {
  font-weight: bold;
}

.about_section .detail-box p {
  margin-top: 15px;
  font-size: 1.125rem;
  line-height: 1.75;
}

.about_section .detail-box a {
  display: inline-block;
  padding: 10px 45px;
  background-color: #3866d1;
  color: #ffffff;
  border-radius: 8px;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  border: none;
  margin-top: 15px;
}

.about_section .detail-box a:hover {
  background-color: #007fa4;
}

.activity_section {
  background: linear-gradient(165deg, #00204a 0%, #0a2d5c 50%, #00204a 100%);
  color: #ffffff;
}

.activity_section .heading_container {
  margin-bottom: 50px;
}

.activity_section .activity_subtitle {
  margin: 0 0 8px 0;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
}

.activity_section .heading_container h2 {
  font-size: 2.1rem;
  margin-bottom: 0;
  font-weight: 700;
}

/* 동아리 활동 그리드 (WHAT WE DO 스타일) */
.activity_grid {
  margin-top: 0;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  margin-left: -15px;
  margin-right: -15px;
}

.activity_item_wrap {
  margin-bottom: 28px;
}

.activity_item {
  height: 100%;
  padding: 28px 22px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  text-align: center;
  color: #ffffff;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
}

.activity_item:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(86, 102, 209, 0.4);
  -webkit-transform: translateY(-4px);
          transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.2);
}

.activity_item_icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 16px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  background: rgba(56, 102, 209, 0.25);
  border-radius: 12px;
  color: #ffffff;
  font-size: 1.4rem;
}

.activity_item h5 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #ffffff;
}

.activity_item p {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.88);
}

@media (min-width: 992px) {
  .activity_item_wrap {
    margin-bottom: 28px;
  }
}

.activity_container {
  margin-top: 0;
}

.activity_card_wrap {
  margin-bottom: 24px;
}

.activity_card_wrap:last-child {
  margin-bottom: 0;
}

@media (min-width: 768px) {
  .activity_card_wrap {
    margin-bottom: 0;
  }
}

.activity_card {
  display: block;
  height: 100%;
  padding: 0;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  text-align: center;
  color: #ffffff;
  text-decoration: none;
  overflow: hidden;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
}

.activity_card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(86, 102, 209, 0.5);
  -webkit-transform: translateY(-6px);
          transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
}

.activity_card_img {
  width: 100%;
  height: 140px;
  margin: 0;
  overflow: hidden;
  background: rgba(56, 102, 209, 0.15);
  -webkit-transition: background 0.3s ease;
  transition: background 0.3s ease;
}

.activity_card:hover .activity_card_img {
  background: rgba(56, 102, 209, 0.25);
}

.activity_card_img img {
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
  -o-object-position: center;
     object-position: center;
  -webkit-transition: -webkit-transform 0.3s ease;
  transition: transform 0.3s ease;
}

.activity_card:hover .activity_card_img img {
  -webkit-transform: scale(1.05);
          transform: scale(1.05);
}

.activity_card h5 {
  padding-top: 20px;
  padding-left: 20px;
  padding-right: 20px;
}

.activity_card p {
  padding-left: 20px;
  padding-right: 20px;
}

.activity_card_more {
  display: block;
  padding-bottom: 24px;
}

.activity_card > h5 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  position: relative;
  padding-bottom: 10px;
}

.activity_card h5::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  -webkit-transform: translateX(-50%);
          transform: translateX(-50%);
  width: 36px;
  height: 3px;
  background: #3866d1;
  border-radius: 2px;
}

.activity_card > p {
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 16px;
  color: rgba(255, 255, 255, 0.9);
}

.activity_card_more {
  font-size: 0.85rem;
  color: #3866d1;
  font-weight: 600;
  display: inline-block;
  -webkit-transition: color 0.2s ease;
  transition: color 0.2s ease;
}

.activity_card:hover .activity_card_more {
  color: #5b8aff;
}

/* 기존 .box 구조 호환 (다른 페이지에서 사용 시) */
.activity_section .box {
  margin-top: 45px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  text-align: center;
}

.activity_section .box .img-box {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: start;
      -ms-flex-align: start;
          align-items: flex-start;
  width: 300px;
  min-width: 75px;
  height: 180px;
  margin-bottom: 15px;
}

.activity_section .box .img-box img {
  max-width: 100%;
  max-height: 100%;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
}

.activity_section .box h5 {
  font-weight: bold;
  margin-bottom: 10px;
}

.activity_section .box p {
  margin-bottom: 0;
}

.tc-wrap { margin-top: 34px; display: flex; justify-content: center; }

.tc-stage {
  position: relative; 
  width: 100%;
  height: clamp(450px, 55vh, 600px); 
  border-radius: 32px; 
  overflow: hidden; 
  background: rgba(255, 255, 255, 0.05) !important; 
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid rgba(255, 255, 255, 0.1); 
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
  user-select: none; touch-action: pan-y; perspective: 1400px;
}

.tc-bg { position: absolute; inset: -30%; background-size: cover; background-position: center; filter: blur(18px) saturate(1.1); transform: scale(1.15); opacity: 0.55; z-index: 0; }
.tc-bg:after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(7,26,51,0.35) 0%, rgba(7,26,51,0.55) 45%, rgba(7,26,51,0.80) 100%); }

.tc-cards { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; z-index: 1; }

.tc-card {
  position: absolute; 
  width: min(800px, 80%); 
  height: calc(100% - 100px); 
  max-height: 420px; 
  
  border-radius: 26px; 
  overflow: hidden; 
  transform-style: preserve-3d; 
  box-shadow: 0 20px 60px rgba(0,0,0,0.5); 
  border: 1px solid rgba(255,255,255,0.12); 
  background: rgba(255,255,255,0.06); 
  will-change: transform, filter, opacity; 
  pointer-events: none;  
  transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), filter 0.4s ease, opacity 0.4s ease;
}
.tc-card.is-active { pointer-events: auto; }
.tc-media { width: 100%; height: 100%; object-fit: cover; display: block; transform: scale(1.02); }

.tc-overlay { position: absolute; left: 0; right: 0; bottom: 0; padding: 25px 25px 20px; color: #fff; background: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.22) 18%, rgba(0,0,0,0.65) 100%); }
.tc-pill { display: inline-block; padding: 6px 12px; border-radius: 999px; font-size: 12px; font-weight: 800; letter-spacing: .04em; background: rgba(255,255,255,0.14); border: 1px solid rgba(255,255,255,0.18); }
.tc-title { margin-top: 10px; margin-bottom: 6px; font-size: clamp(22px, 1.6vw, 28px); font-weight: 900; color: #fff; }
.tc-desc { margin: 0 0 10px; font-size: clamp(14px, 1.05vw, 17px); color: rgba(255,255,255,0.80); line-height: 1.5; }
.tc-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.tc-tags span { font-size: 12px; padding: 6px 10px; border-radius: 999px; background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.16); color: rgba(255,255,255,0.82); }
.tc-link { font-weight: 900; color: #9fe7ff; text-decoration: none; position: relative; z-index: 2; }
.tc-link:hover { text-decoration: underline; }

.tc-controls { position: absolute; left: 20px; right: 20px; top: 50%; transform: translateY(-50%); display: flex; justify-content: space-between; align-items: center; z-index: 9999; pointer-events: none; }
.tc-controls > button { pointer-events: auto; }
.tc-arrow { width: 32px; height: 160px; border-radius: 999px; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12); color: #fff; display: grid; place-items: center; padding: 0; cursor: pointer; transition: transform .12s ease, background .12s ease, border-color .12s ease; }
.tc-arrow svg { width: 18px; height: 18px; pointer-events: none; }
.tc-arrow:hover { background: rgba(255,255,255,0.14); border-color: rgba(255,255,255,0.2); transform: translateY(-1px); }
.tc-hint { position: absolute; left: 0; right: 0; bottom: 14px; text-align: center; font-size: 12px; color: rgba(255,255,255,0.5); z-index: 9999; pointer-events: none; }

@media (max-width: 767px) { 
  .activity_taskchanger { padding-bottom: 60px; }
  .tc-stage { width: 100%; height: 480px; border-radius: 20px; }
  .tc-card { width: min(580px, 88%); height: 320px; border-radius: 18px; } 
  .tc-arrow { width: 28px; height: 28px; border-radius: 5px; } 
  .tc-arrow svg { width: 12px; height: 12px; } 
}

.info_section {
  background-color: #00204a;
  color: #ffffff;
  padding: 45px 0 15px 0;
}

.info_section h4 {
  font-weight: 600;
  margin-bottom: 20px;
}

.info_section .info_col {
  margin-bottom: 30px;
}

.info_section .info_contact .contact_link_box {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
}

.info_section .info_contact .contact_link_box a {
  margin: 5px 0;
  color: #ffffff;
}

.info_section .info_contact .contact_link_box a i {
  margin-right: 5px;
}

.info_section .info_contact .contact_link_box a:hover {
  color: #3866d1;
}

.info_section .info_social {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  margin-top: 20px;
  margin-bottom: 10px;
}

.info_section .info_social a {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  color: #ffffff;
  border-radius: 100%;
  margin-right: 10px;
  font-size: 24px;
}

.info_section .info_social a:hover {
  color: #3866d1;
}

.info_section .info_links {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
}

.info_section .info_links a {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  margin-bottom: 15px;
  color: #ffffff;
}

.info_section .info_links a:hover {
  color: #3866d1;
}

.info_section form input {
  border: none;
  border-bottom: 1px solid #ffffff;
  background-color: transparent;
  width: 100%;
  height: 45px;
  color: #ffffff;
  outline: none;
}

.info_section form input::-webkit-input-placeholder {
  color: #ffffff;
}

.info_section form input:-ms-input-placeholder {
  color: #ffffff;
}

.info_section form input::-ms-input-placeholder {
  color: #ffffff;
}

.info_section form input::placeholder {
  color: #ffffff;
}

.info_section form button {
  width: 100%;
  text-align: center;
  display: inline-block;
  padding: 10px 55px;
  background-color: #3866d1;
  color: #ffffff;
  border-radius: 8px;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  border: none;
  margin-top: 15px;
}

.info_section form button:hover {
  background-color: #3866d1;
}

/* footer section*/
.footer_section {
  position: relative;
  background-color: #ffffff;
  text-align: center;
  display: none;
}

.footer_section p {
  color: #00204a;
  padding: 25px 0;
  margin: 0;
}

.footer_section p a {
  color: inherit;
}
/*# sourceMappingURL=style.css.map */

.education_section {
  position: relative;
  background-color: #ffffff;
  color: #00204a;
}
.education_section:nth-of-type(even) {
  background-color: #f8fafc;
}
.education_section .education_container {
  position: relative;
}

.education_section .box {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  text-align: center;
  margin-top: 45px;
  background-color: #f8f8f9;
  padding: 20px;
  border-radius: 5px;
}

.education_section .box .img-box {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: start;
      -ms-flex-align: start;
          align-items: flex-start;
  width: 300px;
  min-width: 75px;
  height: 180px;
  margin-bottom: 15px;
}

.education_section .box .img-box img {
  max-width: 100%;
  max-height: 100%;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
}

.education_section .box .detail-box h5 {
  font-weight: bold;
  text-transform: uppercase;
}

.education_section .box .detail-box a {
  color: #00204a;
  font-weight: 600;
}

.education_section .box .detail-box a:hover {
  color: #3866d1;
}

.education_section .btn-box {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  margin-top: 45px;
}

.education_section .btn-box a {
  display: inline-block;
  padding: 10px 45px;
  background-color: #3866d1;
  color: #ffffff;
  border-radius: 8px;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  border: none;
}

.education_section .btn-box a:hover {
  background-color: #007fa4;
}

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

.education_section .body {
  margin: 0;
  font-family: Arial, sans-serif;
}

.education_section .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 50px;
}

/* 갤러리 카드: 하나의 단위로 보이도록 */
.education_section .slideshow-container {
  width: 50%;
  position: relative;
  overflow: visible;
  background: linear-gradient(180deg, #fafbfc 0%, #f5f6f9 100%);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 4px 24px rgba(0, 32, 74, 0.08), 0 1px 0 rgba(0, 32, 74, 0.04);
  border: 1px solid rgba(0, 32, 74, 0.06);
}

.education_section .text-container {
  width: 50%;
  padding: 24px 20px 24px 32px;
  align-items: flex-start;
}
.education_section .text-container h2 {
  margin-bottom: 12px;
  font-size: 1.5rem;
  font-weight: 700;
  color: #00204a;
}
.education_section .text-container p {
  line-height: 1.75;
  margin-bottom: 12px;
  color: #334155;
}
.education_section .text-container p:last-of-type {
  margin-bottom: 0;
  font-size: 0.9rem;
  color: #64748b;
}

@media (max-width: 768px) {
  .education_section .slideshow-container {
    width: 100%;
    max-width: 100%;
    padding: 14px;
    border-radius: 14px;
  }

  .education_section .text-container {
    width: 100%;
    padding: 20px 0 0;
  }

  .education_section .container {
    flex-direction: column;
    align-items: stretch;
  }

  .education_section .slideshow-stage {
    min-height: 240px;
  }

  .education_section .mySlides-education,
  .education_section .mySlides-study,
  .education_section .mySlides-seminar,
  .education_section .mySlides-hacking,
  .education_section .mySlides-hackathon,
  .education_section .mySlides-jfs {
    min-height: 240px;
  }

  .education_section .thumbnail-education,
  .education_section .thumbnail-study,
  .education_section .thumbnail-seminar,
  .education_section .thumbnail-hacking,
  .education_section .thumbnail-hackathon,
  .education_section .thumbnail-jfs {
    width: 88px;
    height: 60px;
  }

  .education_section .thumbnails-education,
  .education_section .thumbnails-study,
  .education_section .thumbnails-seminar,
  .education_section .thumbnails-hacking,
  .education_section .thumbnails-hackathon,
  .education_section .thumbnails-jfs {
    padding: 12px;
    gap: 10px;
  }
}

/* 스테이지: 페이드 전환을 위한 고정 높이 */
.education_section .slideshow-stage {
  position: relative;
  min-height: 300px;
  border-radius: 12px;
  overflow: hidden;
  background: #f1f3f5;
}

.education_section .mySlides-education,
.education_section .mySlides-study,
.education_section .mySlides-seminar,
.education_section .mySlides-hacking,
.education_section .mySlides-hackathon,
.education_section .mySlides-jfs {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  text-align: center;
  overflow: hidden;
  border-radius: 12px;
  background: #f1f3f5;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
  z-index: 0;
}

.education_section .mySlides-education.slide-visible,
.education_section .mySlides-study.slide-visible,
.education_section .mySlides-seminar.slide-visible,
.education_section .mySlides-hacking.slide-visible,
.education_section .mySlides-hackathon.slide-visible,
.education_section .mySlides-jfs.slide-visible {
  opacity: 1;
  pointer-events: auto;
  z-index: 1;
}

.education_section .text-container h3 {
  font-size: 15px; 
  color: #888; 
}

.education_section .button-container {
  display: flex;
  align-items: center;
  justify-content: center;
}

.education_section .button {
  display: inline-block;
  width: auto;
  padding: 12px 28px;
  text-align: center;
  background-color: #3866d1;
  color: white;
  border: none;
  border-radius: 10px;
  text-decoration: none;
  margin-top: 24px;
  font-weight: 600;
  transition: background-color 0.2s ease, transform 0.2s ease;
}
.education_section .button:hover {
  background-color: #2d52b8;
  transform: translateY(-1px);
}

/* 썸네일 영역: 한 줄에 묶어서 구분 */
.education_section .thumbnails-education, 
.education_section .thumbnails-study, 
.education_section .thumbnails-seminar, 
.education_section .thumbnails-hacking, 
.education_section .thumbnails-hackathon, 
.education_section .thumbnails-jfs {
  display: flex;
  justify-content: center;
  gap: 12px;
  align-items: center;
  margin-top: 18px;
  padding: 14px 18px;
  background: rgba(0, 32, 74, 0.04);
  border-radius: 12px;
  flex-wrap: wrap;
}

/* 썸네일: 메인과 비율 맞춤, 활성/호버 명확히 */
.education_section .thumbnail-education, 
.education_section .thumbnail-study, 
.education_section .thumbnail-seminar, 
.education_section .thumbnail-hacking, 
.education_section .thumbnail-hackathon, 
.education_section .thumbnail-jfs {
  width: 112px;
  height: 76px;
  object-fit: cover;
  border-radius: 10px;
  cursor: pointer;
  border: 2px solid transparent;
  opacity: 0.7;
  transition: opacity 0.22s ease, border-color 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
  box-shadow: 0 1px 3px rgba(0, 32, 74, 0.08);
}

.education_section .thumbnail-education:hover,
.education_section .thumbnail-study:hover,
.education_section .thumbnail-seminar:hover,
.education_section .thumbnail-hacking:hover,
.education_section .thumbnail-hackathon:hover,
.education_section .thumbnail-jfs:hover {
  opacity: 1;
  transform: scale(1.04);
  box-shadow: 0 4px 12px rgba(0, 32, 74, 0.12);
}

.education_section .thumbnail-education.active,
.education_section .thumbnail-study.active,
.education_section .thumbnail-seminar.active,
.education_section .thumbnail-hacking.active,
.education_section .thumbnail-hackathon.active,
.education_section .thumbnail-jfs.active {
  opacity: 1;
  border-color: #3866d1;
  box-shadow: 0 0 0 2px #3866d1, 0 4px 12px rgba(56, 102, 209, 0.25);
  transform: scale(1.02);
}

/* 이전/다음 버튼: 스테이지 안에서 이미지 세로 중앙 정렬, 각도 아이콘 */
.education_section .slideshow-stage .slide-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #fff;
  background: rgba(0, 32, 74, 0.7);
  border-radius: 50%;
  text-decoration: none;
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  z-index: 10;
  box-shadow: 0 2px 10px rgba(0, 32, 74, 0.2);
}
.education_section .slideshow-stage .slide-btn i {
  font-size: 22px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  font-weight: normal;
  width: 1em;
  height: 1em;
}
.education_section .slideshow-stage .slide-btn:hover {
  background: #3866d1;
  transform: translateY(-50%) scale(1.06);
  box-shadow: 0 4px 16px rgba(56, 102, 209, 0.35);
}
.education_section .slideshow-stage .slide-btn:focus-visible {
  outline: 2px solid #3866d1;
  outline-offset: 2px;
}
.education_section .slideshow-stage .slide-prev {
  left: 12px;
}
.education_section .slideshow-stage .slide-next {
  right: 12px;
}

.education_section img {
  max-width: 100%;
  height: auto;
}

/* 슬라이드쇼 메인 이미지 */
.education_section .slideshow-container .slide-img {
  width: 100%;
  height: auto;
  max-height: 360px;
  object-fit: contain;
  object-position: center;
  border-radius: 12px;
  display: block;
  background: transparent;
}
.education_section .slideshow-container .mySlides-education .slide-img,
.education_section .slideshow-container .mySlides-study .slide-img,
.education_section .slideshow-container .mySlides-seminar .slide-img,
.education_section .slideshow-container .mySlides-hacking .slide-img,
.education_section .slideshow-container .mySlides-hackathon .slide-img,
.education_section .slideshow-container .mySlides-jfs .slide-img {
  margin: 0 auto;
}

.seminar_section {
  position: relative;
  background-color: #ffffff;
  color: #00204a;
}

.seminar_section .box {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  text-align: center;
  margin-top: 45px;
  background-color: #f8f8f9;
  padding: 20px;
  border-radius: 5px;
}

.seminar_section .box .detail-box h5 {
  font-weight: bold;
  text-transform: uppercase;
}

.seminar_section .box .detail-box a {
  color: #00204a;
  font-weight: 600;
}

.seminar_section .box .detail-box a:hover {
  color: #3866d1;
}

.seminar_section .btn-box {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  margin-top: 45px;
}

.seminar_section .btn-box a {
  display: inline-block;
  padding: 10px 45px;
  background-color: #3866d1;
  color: #ffffff;
  border-radius: 8px;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  border: none;
}

.seminar_section .btn-box a:hover {
  background-color: #3866d1;
}

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

.seminar_section .body {
  margin: 0;
  font-family: Arial, sans-serif;
}

.seminar_section .container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
}

.seminar_section .text-container {
  align-items: center;
  justify-content: center;
  text-align: center;
  width: 50%;
  padding: 20px;
}

.hack_section {
  position: relative;
  background-color: #ffffff;
  color: #00204a;
}

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

.hack_section .body {
  margin: 0;
  font-family: Arial, sans-serif;
}

.hack_section .container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
}

.hack_section .card {
  background-color: #f0f0f0;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  width: 100%;
}

.hack_section .image {
  flex: 1; 
  padding: 20px;
  display: flex;
  align-items: center; 
  justify-content: center;
}

.hack_section .image img { 
  max-height: 500px;
}

.hack_section .text_container {
  flex: 1; 
  padding: 20px; 
  display: flex;
  align-items: center; 
  justify-content: center;
}

.hack_section .text_container p {
  margin: 0;
}

.hack_section .title {
  width: 150px; 
  height: 50px; 
  background-color: #00204a; 
  color: white; 
  border-radius: 25px; 
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 20px;
  margin-top: 20px;
  margin-right: 20px;
  margin-left: 20px;
}

.hack_section .left {
  max-width: 100%;
}

/* =========================================
   [1] 태블릿 & 모바일 공통 반응형 (991px 이하)
   - 주로 상단바(네비게이션), 메뉴 형태 변화 대응
========================================= */
@media (max-width: 991px) {
  /* 1. 모바일 햄버거 아이콘 얄쌍하게 축소 */
  .custom_nav-container .navbar-toggler {
    width: 26px !important;
    height: 26px !important;
    margin-right: 15px !important;
  }
  .custom_nav-container .navbar-toggler span {
    width: 22px !important;
    height: 2px !important;
    margin: 5px auto !important;
  }
  .custom_nav-container .navbar-toggler span::before,
  .custom_nav-container .navbar-toggler span::after {
    height: 2px !important;
    top: -7px !important;
  }
  .custom_nav-container .navbar-toggler span::after {
    top: 7px !important;
  }

  /* 2. 모바일 드롭다운 메뉴 창 위치 고정 */
  .custom_nav-container .navbar-collapse {
    position: absolute;
    top: 100%;
    right: 15px; 
    width: 200px;
    background-color: rgba(10, 10, 67, 0.95);
    border-radius: 12px;
    padding: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  }

  /* 3. 투명인간이던 하위 메뉴(동아리 활동 안쪽)를 아예 보이게 펼쳐두기 */
  .custom_nav-container .navbar-nav .nav-item ul {
    position: relative !important;
    left: 0 !important;          /* 👈 핵심: PC버전의 50% 밀어내기 설정을 무력화 */
    right: 0 !important;         /* 👈 확실하게 꽉 채우기 */
    visibility: visible !important; 
    opacity: 1 !important;
    display: block !important;
    transform: none !important;
    width: 100% !important;
    min-width: auto !important;
    background-color: rgba(0, 0, 0, 0.2) !important; 
    border: none !important;
    box-shadow: none !important;
    border-radius: 8px !important;
    padding: 5px 0 !important;
    margin: 5px 0 10px 0 !important; 
    text-align: center !important; /* 👈 글씨도 위아래 메뉴와 똑같이 가운데 정렬 */
  }

  /* 하위 메뉴(정기 세미나 등) 글씨 크기 및 디자인 다듬기 */
  .custom_nav-container .navbar-nav .nav-item ul li a.nav-link {
    font-size: 0.85rem !important;
    padding: 8px 15px !important;
    color: rgba(255, 255, 255, 0.75) !important; 
    display: block !important;
  }
  .custom_nav-container .navbar-nav .nav-item ul li a.nav-link:hover {
    color: #ffffff !important;
    background-color: transparent !important;
  }
}

/* =========================================
   [2] 스마트폰 전용 반응형 (767px 이하)
   - 모바일 화면에 맞춰 글자 크기, 여백, 구조 다이어트
========================================= */
@media (max-width: 767px) {
  
  /* --- 1. 메인 배너(Hero) 섹션 --- */
  .slider_section {
    padding-top: 140px !important;    
    padding-bottom: 180px !important; 
  }
  .slider_section .img-box {
    margin: 0; 
    position: relative;
    top: -15px !important; 
  }
  .slider_section .carousel-inner {
    overflow: visible !important;
  }
  .slider_section .detail-box h1 {
    font-size: 3.5rem; 
    margin-bottom: 10px;
  }
  .slider_section .detail-box .slider_subtitle {
    font-size: 1.4rem;
  }
  .slider_section .detail-box p {
    font-size: 0.8rem;
  }

  /* --- 2. 동아리 소개(About) 섹션 --- */
  .about_section .heading_container h2 {
    font-size: 1.8rem; 
  }
  .about_section .heading_container p {
    font-size: 0.85rem; 
  }
  .about_section .img-box img {
    width: 160px !important; 
    height: 160px !important;
    margin-bottom: 0px; 
  }
  .about_section .detail-box p {
    font-size: 0.9rem; 
    line-height: 1.6;  
    margin-top: 10px;
  }

  /* --- 3. Activity (6개 블록) 섹션 --- */
  .activity_section .heading_container h2 {
    font-size: 1.5rem !important; 
    margin-bottom: 20px !important;
  }
  .activity_section .activity_subtitle {
    font-size: 0.75rem !important; 
  }
  .activity_item {
    padding: 20px 10px; 
  }
  .activity_item h5 {
    font-size: 0.85rem !important; 
    margin-bottom: 8px !important;
  }
  .activity_item p {
    font-size: 0.75rem !important; 
    line-height: 1.3 !important; 
  }
  .activity_item_icon {
    width: 36px !important;
    height: 36px !important;
    font-size: 1.1rem !important;
    margin-bottom: 10px !important;
  }

  /* --- 4. 3D 카드 슬라이더 (Taskchanger) --- */
  .activity_taskchanger { padding-bottom: 60px; }
  .tc-stage { width: 100%; height: 480px; border-radius: 20px; }
  .tc-card { width: min(580px, 88%); height: 320px; border-radius: 18px; } 
  .tc-arrow { width: 28px; height: 28px; border-radius: 5px; } 
  .tc-arrow svg { width: 12px; height: 12px; } 

  /* --- 5. 학술 행사(Conferences) 섹션 --- */
  .conferences_section .heading_container h2 {
    font-size: 1.5rem !important; 
    margin-bottom: 5px !important;
  }
  .conferences_section .conferences_lead {
    font-size: 0.8rem !important;
    margin-bottom: 25px !important;
  }
  .conference_card_wrap {
    padding-left: 5px !important; 
    padding-right: 5px !important;
    margin-bottom: 10px !important;
  }
  .conference_card_img {
    height: 80px !important; 
    padding: 10px !important;
  }
  .conference_card > h5 {
    font-size: 0.85rem !important;
    margin-top: 10px !important;
    margin-bottom: 8px !important;
    padding-bottom: 8px !important;
  }
  .conference_card > p {
    font-size: 0.7rem !important;
    line-height: 1.3 !important;
    margin-bottom: 10px !important;
    padding-left: 5px !important;
    padding-right: 5px !important;
  }
  .conference_card_more {
    font-size: 0.7rem !important;
    padding-bottom: 12px !important;
  }
  .conference_btn {
    padding: 8px 20px !important;
    font-size: 0.85rem !important;
    margin-top: 20px !important;
  }

  /* --- 6. 하단바(Footer/Info) 섹션 모바일 정렬 수정 (칸 중앙, 글씨 왼쪽) --- */
  .info_section {
    padding: 30px 0 15px 0 !important; 
  }

  /* 각각 50%를 차지하는 칸 안에서 내용물 박스를 중앙에 예쁘게 배치 */
  .info_section .info_col {
    display: flex !important;
    flex-direction: column !important; /* 👈 이거 없으면 주소랑 인스타가 가로로 꼬입니다 */
    justify-content: flex-start !important; 
    align-items: flex-start !important; 
  }

  /* 내용물 박스 안쪽의 글씨와 요소들은 모두 왼쪽으로 가지런히 정렬 */
  .info_section .info_contact,
  .info_section .info_link_box {
    display: flex;
    flex-direction: column;
    align-items: flex-start !important; 
    text-align: left !important;
  }
  
  .info_section h4 {
    font-size: 1.05rem !important; 
    margin-bottom: 12px !important;
  }
  
  /* 주소, 이메일 묶음 왼쪽 정렬 */
  .info_section .info_contact .contact_link_box {
    align-items: flex-start !important; 
  }
  .info_section .info_contact .contact_link_box a {
    font-size: 0.75rem !important;
    margin: 5px 0 !important;
    align-items: flex-start !important; 
    justify-content: flex-start !important; /* 왼쪽 정렬의 핵심 */
  }
  .info_section .info_contact .contact_link_box a i {
    margin-top: 3px !important; /* 아이콘을 글자 높이에 맞게 살짝 내림 */
    margin-right: 8px !important; 
  }
  .info_section .info_contact .contact_link_box a span {
    word-break: keep-all; 
    line-height: 1.4 !important;
    text-align: left !important;
  }

  /* Links 쪽(Home, 동아리 활동 등) 링크들 왼쪽 정렬 */
  .info_section .info_links {
    align-items: flex-start !important; 
  }
  .info_section .info_links a {
    font-size: 0.8rem !important;
    margin-bottom: 8px !important;
  }

  /* 인스타그램 아이콘도 자연스럽게 왼쪽 흐름에 맞추기 */
  .info_section .info_social {
    display: flex !important;
    width: 100% !important; /* 👈 구역을 꽉 채워야 왼쪽 끝으로 딱 붙음 */
    justify-content: flex-start !important; 
    margin-top: 15px !important;
    margin-bottom: 0 !important;
    padding-left: 2px !important; /* 위의 위치, 메일 아이콘들과 세로줄 미세하게 맞추기 */
  }
  .info_section .info_social a {
    font-size: 20px !important; 
    margin: 0 15px 0 0 !important; 
  }
}

/* =========================================
   하단바(파란색 박스) 전체 높이 초슬림 다이어트 (PC/모바일 공통)
========================================= */
/* 1. 파란 박스 자체의 위아래 껍데기 여백 확 줄이기 */
.info_section {
  padding: 30px 0 20px 0 !important; /* 위 30px, 아래 20px (원래 70~90px 씩 들어있음) */
}

/* 2. 'Address', 'Links' 제목 밑의 휑한 공간 줄이기 */
.info_section h4 {
  margin-bottom: 12px !important; 
}

/* 3. 주소, 이메일, 메뉴 링크들 사이의 위아래 간격 좁히기 */
.info_section .contact_link_box a,
.info_section .info_links a {
  margin: 4px 0 !important; 
}

/* 4. 인스타그램 로고 위쪽 붕 뜨는 공간 줄이기 */
.info_section .info_social {
  margin-top: 12px !important; 
}