/* ================================ Intro ================================ */

/* 인트로 스크롤 영역 확보 */
#intro-spacer {
    height: 200vh;
    position: relative;
    z-index: 1;
}

/* 인트로 오버레이 (고정) */
#intro-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: #111;
    z-index: 99999;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

/* 로고 + 텍스트 컨텐츠 */
#intro-overlay .intro-content {
    position: absolute;
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: opacity 0.6s ease;
}

#intro-overlay .intro-logo {
    width: clamp(120px, 15vw, 240px);
    opacity: 0;
    transform: scale(0.85);
    animation: introLogoIn 1.5s ease forwards 0.4s;
}

#intro-overlay .intro-line {
    width: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.3);
    margin-top: 30px;
    animation: introLineExpand 1s ease forwards 1.2s;
}

#intro-overlay .intro-text {
    margin-top: 20px;
    font-size: clamp(13px, 1vw, 16px);
    color: rgba(255, 255, 255, 0);
    letter-spacing: 0.3em;
    font-weight: 300;
    animation: introTextIn 0.8s ease forwards 1.8s;
}

/* 세로 영상 컨테이너 */
#intro-overlay .intro-video-wrap {
    position: absolute;
    z-index: 2;
    width: 22vw;
    height: 70vh;
    border-radius: 16px;
    overflow: hidden;
    opacity: 0;
    transition: opacity 1.2s ease, border-radius 0.1s linear;
}

#intro-overlay .intro-video-wrap video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 스크롤 유도 화살표 */
#intro-overlay .intro-scroll-hint {
    position: absolute;
    bottom: 40px;
    z-index: 4;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0;
    transition: opacity 0.5s ease;
}

#intro-overlay .intro-scroll-hint span {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.2em;
    font-weight: 300;
}

#intro-overlay .intro-scroll-hint .scroll-arrow {
    width: 1px;
    height: 30px;
    background: linear-gradient(to bottom, rgba(255,255,255,0.5), transparent);
    animation: scrollArrowBounce 1.5s ease-in-out infinite;
}

@keyframes introLogoIn {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes introLineExpand {
    to {
        width: clamp(60px, 8vw, 120px);
    }
}

@keyframes introTextIn {
    to {
        color: rgba(255, 255, 255, 0.6);
    }
}

@keyframes scrollArrowBounce {
    0%, 100% { transform: translateY(0); opacity: 0.5; }
    50% { transform: translateY(8px); opacity: 1; }
}

/* 인트로 중 스크롤 방지 */
body.intro-active {
    overflow: hidden !important;
    height: 100vh !important;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
}


/* 인트로 완료 후 제거 */
#intro-overlay.done {
    display: none;
}

/* ================================ Header ================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 999;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--padding-pc);
    /* background-color: red; */
    transition: transform 0.6s ease, opacity 0.6s ease, background 0.3s ease;
    opacity: 0;
}

.header.header--visible {
    opacity: 1;
}

.header.header--scrolled {
    backdrop-filter: var(--header-filter);
    -webkit-backdrop-filter: var(--header-filter);
    background: rgba(0, 0, 0, 0.5);
}

/* 스크롤 0~99px에서 hover 시 */
.header:not(.header--scrolled):hover {
    backdrop-filter: var(--header-filter);
    -webkit-backdrop-filter: var(--header-filter);
    background: rgba(0, 0, 0, 0.5);
}

.header.header--hidden {
    transform: translateY(-100%);
}

/* 좌측: 로고 */
.header .logo {
    flex-shrink: 0;
    width: clamp(120px, 8vw, 160px);
}

.header .logo a {
    display: flex;
    align-items: center;
    height: 100%;
}

.header .logo img {
    width: 100%;
    height: auto;
}

.header .logo .logo_scroll {
    display: none;
}


/* 중앙: 네비게이션 */
.header .gnb {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.header .gnb > h2 {
    display: none;
}

.header .gnb_list {
    display: flex;
    align-items: center;
    gap: clamp(10px, 2vw, 40px);
}

.header .gnb_item {
    position: relative;
}

.header .gnb_link {
    display: inline-block;
    padding: 10px 0;
    color: var(--base-color-white);
    font-size: var(--text-font-size);
    font-weight: 400;
    white-space: nowrap;
    transition: opacity 0.3s;
}

.header .gnb_item:hover ~ .gnb_item .gnb_link,
.header .gnb_item:has(~ .gnb_item:hover) .gnb_link {
    opacity: 0.5;
}

/* 2차 메뉴 (드롭다운) */
.header .gnb_sub {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 140px;
    padding: 10px 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header .gnb_item:hover .gnb_sub {
    display: block;
}

.header .gnb_sub_link {
    display: block;
    padding: 8px 20px;
    color: var(--base-color-white);
    font-size: var(--text-font-size-s);
    white-space: nowrap;
    transition: opacity 0.3s;
}

.header .gnb_sub_link:hover {
    opacity: 0.6;
}

/* 우측: 버튼 + 햄버거 */
.header .hd_right {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 20px;
}

.header .hd_btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    border: 1px solid var(--base-color-white);
    border-radius: 30px;
    color: var(--base-color-white);
    font-size: 14px;
    white-space: nowrap;
    transition: all 0.3s;
}

.header .hd_btn:hover {
    background: var(--signature-color);
    border: 1px solid var(--signature-color);
}

/* 햄버거 메뉴 버튼 */
.header .hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 22px;
    height: 28px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.header .hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--base-color-white);
    transition: 0.3s;
}

/* ================================ 전체메뉴 (오버레이) ================================ */

.gnb_all {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--base-color-white);
    z-index: 10001;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    padding: 0 var(--padding-pc);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.8s ease;
    overflow-y: auto;
}

.gnb_all.active {
    opacity: 1;
    pointer-events: auto;
}

.gnb_all h2 {
    display: none;
}

.gnb_all_list {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
}

.gnb_all_item {
    text-align: left;
    padding: clamp(8px, 1.5vh, 15px) 0;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}


.gnb_all.active .gnb_all_item {
    opacity: 1;
    transform: translateY(0);
}

.gnb_all.active .gnb_all_item:nth-child(1) { transition-delay: 0.1s; }
.gnb_all.active .gnb_all_item:nth-child(2) { transition-delay: 0.2s; }
.gnb_all.active .gnb_all_item:nth-child(3) { transition-delay: 0.3s; }
.gnb_all.active .gnb_all_item:nth-child(4) { transition-delay: 0.4s; }
.gnb_all.active .gnb_all_item:nth-child(5) { transition-delay: 0.5s; }
.gnb_all.active .gnb_all_item:nth-child(6) { transition-delay: 0.6s; }
.gnb_all.active .gnb_all_item:nth-child(7) { transition-delay: 0.7s; }
.gnb_all.active .gnb_all_item:nth-child(8) { transition-delay: 0.8s; }

/* 메뉴 링크 - hover 시 텍스트 슬라이드 업 */
.gnb_all_link {
    display: block;
    position: relative;
    overflow: hidden;
}

.gnb_all_link .nav_text {
    display: block;
    color: var(--base-color-black);
    font-size: clamp(28px, 3.5vw, 50px);
    font-weight: 600;
    line-height: 1.2;
    transition: transform 0.4s ease;
}

.gnb_all_link .nav_text_hover {
    position: absolute;
    left: 0;
    top: 100%;
    color: var(--signature-color);
    font-size: clamp(28px, 3.5vw, 50px);
    font-weight: 600;
    line-height: 1.2;
    transition: transform 0.4s ease;
    white-space: nowrap;
}

.gnb_all_link:hover .nav_text {
    transform: translateY(-100%);
}

.gnb_all_link:hover .nav_text_hover {
    transform: translateY(-100%);
}

/* 서브메뉴 */
.gnb_all_item ul {
    padding: 0 0 10px 0;
}

.gnb_all_item ul li a {
    display: inline-block;
    padding: 6px 0;
    color: var(--background-color-gray);
    font-size: var(--text-font-size);
    transition: color 0.3s;
}

.gnb_all_item ul li a:hover {
    color: var(--signature-color);
}

/* 닫기 버튼 - X 형태 */
.gnb_all_close {
    position: absolute;
    top: 30px;
    right: var(--padding-pc);
    width: clamp(40px, 7vw, 100px);
    height: clamp(40px, 7vw, 100px);
    background: none;
    border: none;
    cursor: pointer;
    transition: transform 0.3s;
}


.gnb_all_close:hover {
    transform: rotate(90deg);
}

.gnb_all_close span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--base-color-black);
    position: absolute;
    top: 50%;
    left: 0;
}

.gnb_all_close span:first-child {
    transform: rotate(45deg);
}

.gnb_all_close span:last-child {
    transform: rotate(-45deg);
}

/* 우측 하단 영상 */
.gnb_all_video {
    position: absolute;
    right: var(--padding-pc);
    bottom: var(--padding-pc);
    width: 450px;
    border-radius: 10px;
    overflow: hidden;
}

.gnb_all_video video {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ================================ 메인 섹션 ================================ */

.section_1 {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.section_1 video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.section_1_video_back {
    z-index: 0;
}

.section_1_video_front {
    z-index: 1;
    transition: opacity 0.6s ease;
}

.section_1_text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 2;
}

.section_1_title {
    font-family: var(--font-EN-serif);
    font-size: clamp(28px, 3.2vw, 54px);
    font-weight: 300;
    line-height: 1;
    color: var(--base-color-white);
    letter-spacing: 0.02em;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s ease, transform 1s ease;
}

.section_1_sub {
    margin-top: clamp(12px, 1.5vw, 24px);
    font-size: clamp(15px, 1vw, 18px);
    font-weight: 300;
    line-height: 1;
    color: rgba(255, 255, 255);
    letter-spacing: 0;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s ease 0.4s, transform 1s ease 0.4s;
}

.section_1_text.active .section_1_title {
    opacity: 1;
    transform: translateY(0);
}

.section_1_text.active .section_1_sub {
    opacity: 1;
    transform: translateY(0);
}


/* ================================ section_2 ================================ */

.section_2_wrap {
    height: 200vh;
    position: relative;
}

.section_2 {
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.section_2_bg_video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
}

.section_2::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 0;
}

.section_2_fill_text {
    position: relative;
    z-index: 1;
    text-align: center;
}

.section_2_fill_text .fill-line {
    font-family: var(--font-EN-serif);
    font-size: clamp(28px, 4.5vw, 72px);
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.01em;
    color: rgba(255, 255, 255, 0.2);
    background: linear-gradient(to right, var(--base-color-white) 50%, rgba(255, 255, 255, 0.2) 50%);
    background-size: 200% 100%;
    background-position: 100% 0;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: background-position 0s linear;
}

/* scroll down indicator */
.scroll-down-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.scroll-down-indicator span {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.2em;
    font-weight: 300;
}

.scroll-down-indicator .scroll-arrow {
    width: 1px;
    height: 30px;
    background: linear-gradient(to top, rgba(255,255,255,0.5), transparent);
    animation: scrollArrowBounce 1.5s ease-in-out infinite;
}

/* ================================ section_3: 메뉴 패널 ================================ */

.section_3 {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    background: #111;
}

.section_3_bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
}

.section_3_panels {
    position: relative;
    z-index: 1;
    display: flex;
    width: 100%;
    height: 100%;
}

.section_3_panel,
.section_3_panel:link,
.section_3_panel:visited {
    flex: 1;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: clamp(30px, 3vw, 50px);
    color: var(--base-color-white);
    text-decoration: none;
    border-right: 8px solid #000;
    background: rgba(0, 0, 0, 0.4);
    transition: flex 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), background 0.6s ease;
    overflow: hidden;
}

.section_3_panel:last-child {
    border-right: none;
}

/* hover 시 배경 어두워짐 */
.section_3_panel:hover {
    background: rgba(0, 0, 0, 0.8);
}

.panel_num {
    font-family: var(--font-EN-serif);
    color: rgba(255, 255, 255, 0.4);
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}

.panel_title {
    font-size: clamp(18px, 1.5vw, 28px);
    font-weight: 600;
    color: var(--base-color-white);
    line-height: 1.3;
    transition: transform 0.4s ease;
}

.panel_desc {
    font-family: var(--font-EN-serif);
    font-size: clamp(13px, 0.8vw, 15px);
    color: rgba(255, 255, 255);
    margin-top: 6px;
    font-weight: 300;
}

.panel_more {
    display: inline-block;
    margin-top: clamp(16px, 1.5vw, 24px);
    font-size: clamp(13px, 0.7vw, 14px);
    color: var(--base-color-white);
    letter-spacing: 0.08em;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.section_3_panel:hover .panel_more {
    opacity: 1;
    transform: translateY(0);
}

/* ================================ section_4: 프로젝트 ================================ */

.section_4 {
    position: relative;
    width: 100%;
    padding: clamp(80px, 10vw, 140px) 0;
    overflow: hidden;
    background: #111;
}

.section_4_bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
    z-index: 0;
}

.section_4_inner {
    position: relative;
    z-index: 1;
    width: 100%;
}

/* 중앙 텍스트 */
.section_4_center {
    text-align: center;
    padding: clamp(40px, 5vw, 80px) 0;
}

.section_4_title {
    font-family: var(--font-EN-serif);
    font-size: clamp(32px, 3.5vw, 60px);
    font-weight: 400;
    color: var(--base-color-white);
}

.section_4_desc {
    margin-top: clamp(12px, 1.2vw, 20px);
    font-size: clamp(14px, 0.9vw, 16px);
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.7;
}

.section_4_btn,
.section_4_btn:link,
.section_4_btn:visited {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-top: clamp(20px, 2vw, 36px);
    padding: 12px 28px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 30px;
    color: var(--base-color-white);
    font-size: clamp(13px, 0.8vw, 14px);
    letter-spacing: 0.1em;
    transition: all 0.3s;
}

.section_4_btn span {
    color: inherit;
    transition: color 0.3s;
}

.section_4_btn:hover,
.section_4_btn:active {
    background: var(--base-color-white);
    color: var(--base-color-black);
    border-color: var(--base-color-white);
}

/* 트랙 공통 */
.section_4_track {
    display: flex;
    width: max-content;
    gap: clamp(10px, 1.2vw, 20px);
}

.section_4_track--left {
    animation: scrollLeft 30s linear infinite;
}

.section_4_track--right {
    animation: scrollRight 30s linear infinite;
}

/* hover 시 애니메이션 일시정지 */
.section_4_track:hover {
    animation-play-state: paused;
}

@keyframes scrollLeft {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

@keyframes scrollRight {
    0% { transform: translateX(-50%); }
    100% { transform: translateX(0); }
}

/* 슬라이드 아이템 */
.section_4_slide {
    position: relative;
    flex-shrink: 0;
    width: clamp(220px, 22vw, 400px);
    opacity: 0.5;
    transition: opacity 0.4s ease;
}

.section_4_slide:hover {
    opacity: 1;
}

.section_4_slide .slide_name {
    display: block;
    padding: 10px 4px 0;
    font-size: clamp(13px, 0.75vw, 14px);
    font-weight: 400;
    color: #fff;
    text-align: left;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.section_4_slide:hover .slide_name {
    opacity: 1;
    transform: translateY(0);
}

.section_4_slide img {
    width: 100%;
    height: auto;
    object-fit: cover;
    display: block;
    border-radius: 8px;
}

/* ================================ section_5: BY THE NUMBERS ================================ */

.section_5 {
    position: relative;
    width: 100%;
    padding: clamp(80px, 10vw, 200px) 0;
    overflow: hidden;
    background: #000;
}

.section_5_bg_video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
}

.section_5_overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.45);
    z-index: 1;
}

.section_5_inner {
    position: relative;
    z-index: 2;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--padding-pc);
}

.section_5_head {
    margin-bottom: clamp(40px, 5vw, 70px);
}

.section_5_title {
    font-family: var(--font-EN-serif);
    font-size: clamp(32px, 4vw, 56px);
    font-weight: 400;
    color: var(--base-color-white);
    line-height: 1.2;
}

.section_5_desc {
    margin-top: clamp(12px, 1.2vw, 20px);
    font-size: clamp(14px, 0.9vw, 16px);
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.7;
}

.section_5_cards {
    display: flex;
    gap: clamp(16px, 2vw, 30px);
}

.section_5_card {
    flex: 1;
    background: rgb(0 0 0 / 36%);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgb(0 0 0 / 10%);
    border-radius: 12px;
    padding: clamp(28px, 3vw, 45px) clamp(24px, 2.5vw, 40px);
}

.card_label {
    font-size: clamp(16px, 1.2vw, 26px);
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.2;
    margin-bottom: clamp(16px, 2vw, 30px);
}

.card_number {
    display: flex;
    align-items: baseline;
    justify-content: flex-end;
}

.count_num {
    font-size: clamp(48px, 3.4vw, 68px);
    font-weight: 500;
    color: var(--base-color-white);
    line-height: 1;
}

.count_unit {
    font-size: clamp(16px, 1.5vw, 24px);
    color: rgba(255, 255, 255, 0.7);
    margin-left: 4px;
}

.count_plus {
    margin-left: 2px;
    color: var(--base-color-white);
}

/* ================================ section_6 ================================ */

.section_6_wrap {
    position: relative;
    height: 300vh;
}

.section_6 {
    position: sticky;
    top: 0;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #000;
}

.section_6_bg_video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    opacity: 0;
    transition: opacity 1.2s ease;
    pointer-events: none;
}

.section_6_bg_video.visible {
    opacity: 1;
}

.section_6_overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
    opacity: 0;
    transition: opacity 1.2s ease;
}

.section_6_overlay.visible {
    opacity: 1;
}

.section_6_text {
    position: absolute;
    z-index: 2;
    text-align: center;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1.2s ease, transform 1.2s ease;
}

.section_6_text.visible {
    opacity: 1;
    transform: translateY(0);
}

.section_6_text p {
    font-size: clamp(18px, 3.4vw, 70px);
    font-weight: 300;
    color: var(--base-color-white);
    line-height: 1.3;
}

.section_6_text .point {
    color: var(--signature-color);
    font-size: clamp(18px, 3.4vw, 70px);
    font-weight: 700;
}

.section_6_cta {
    position: absolute;
    z-index: 2;
    text-align: center;
    opacity: 0;
    transform: translateY(60px);
    transition: opacity 1.2s ease, transform 1.2s ease;
}

.section_6_cta.visible {
    opacity: 1;
    transform: translateY(0);
}

.section_6_cta_title {
    font-size: clamp(25px, 5vw, 78px);
    font-weight: 800;
    color: var(--base-color-white);
    letter-spacing: -0.02em;
    margin-bottom: 30px;
}

.section_6_cta_desc {
    font-size: clamp(14px, 1.2vw, 18px);
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 50px;
}

.section_6_cta_btns {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.section_6_cta_btn {
    display: inline-block;
    padding: 18px 50px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 50px;
    color: #fff !important;
    font-size: clamp(14px, 1.1vw, 18px);
    font-weight: 400;
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.section_6_cta_btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.8);
}

/* ================================ 반응형 ================================ */

/* ~1200px */
@media all and (max-width: 1200px) {
    .section_2_fill_text .fill-line {
        font-size: clamp(26px, 4vw, 52px);
    }
}

/* 태블릿 ~960px */
@media all and (max-width: 960px) {

    #intro-overlay .intro-line {
        margin-top: 20px;
    }

    #intro-overlay .intro-text {
        margin-top: 14px;
        letter-spacing: 0.2em;
    }

    #intro-overlay .intro-video-wrap {
        width: 45vw;
        height: 60vh;
        border-radius: 14px;
    }

    #intro-overlay .intro-scroll-hint {
        bottom: 30px;
    }

    .section_1_title {
        font-size: clamp(20px, 3.5vw, 32px);
    }

    .section_1_title br {
        display: none;
    }

    .section_1_sub {
        font-size: clamp(13px, 1.5vw, 15px);
    }

    .section_1_text {
        width: 85%;
    }

    .section_3_panels {
        flex-direction: column;
    }

    .section_3_panel,
    .section_3_panel:link,
    .section_3_panel:visited {
        flex: 1;
        flex-direction: row;
        align-items: center;
        justify-content: flex-start;
        gap: 16px;
        padding: clamp(16px, 3vw, 24px) var(--padding-mo);
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .section_3_panels:hover .section_3_panel {
        flex: 1;
    }

    .section_3_panels:hover .section_3_panel:hover {
        flex: 1;
        background: rgba(0, 0, 0, 0.2);
    }

    .panel_num {
        margin-bottom: 0;
    }

    .panel_more {
        display: none;
    }

    .section_4_slide {
        width: clamp(180px, 30vw, 280px);
    }

    .section_5_cards {
        flex-direction: column;
    }

    .header {
        padding: 0 var(--padding-mo);
    }

    .header .gnb {
        display: none;
    }

    .header .hd_btn {
        display: none;
    }

    .gnb_all {
        padding: 0 var(--padding-mo);
    }

    .gnb_all_video {
        display: none;
    }


    .section_1 {
        height: 100vh;
    }

    .section_1 video {
        height: 100%;
        object-fit: cover;
    }

    .section_2 {
        padding: clamp(60px, 10vw, 100px) var(--padding-mo);
    }

    .section_2 {
        height: 100vh;
    }

    .section_2_fill_text .fill-line {
        font-size: clamp(24px, 5vw, 40px);
    }

    .gnb_all_close {
        top: var(--padding-mo);
        right: var(--padding-mo);
    }

}

.mo_br {
    display: none;
}

@media all and (max-width: 680px) {
    .section_6_cta_btns {
        flex-direction: column;
    }

    .section_5_inner {
        padding: var(--padding-mo);
    }
}

/* 모바일 ~480px */
@media all and (max-width: 480px) {
    .mo_br {
        display: block;
    }
    /* 인트로 반응형 */
    #intro-overlay .intro-line {
        margin-top: 16px;
    }

    #intro-overlay .intro-text {
        margin-top: 12px;
        letter-spacing: 0.15em;
    }

    #intro-overlay .intro-video-wrap {
        width: 70vw;
        height: 50vh;
        border-radius: 12px;
    }

    #intro-overlay .intro-scroll-hint {
        bottom: 24px;
    }

    #intro-overlay .intro-scroll-hint .scroll-arrow {
        height: 24px;
    }

    .section_1_title {
        font-size: clamp(18px, 5,5vw, 24px);
        line-height: 1.4;
    }

    .section_1_sub {
        font-size: clamp(14px, 3.8vw, 15px);
        line-height: 1.4;
    }

    .section_1_text {
        width: 90%;
    }

    .section_2 {
        height: 100vh;
    }

    .section_4_slide {
        width: clamp(150px, 40vw, 220px);
    }

    .section_4_track--left,
    .section_4_track--right {
        animation-duration: 20s;
    }

    .header .logo {
        width: clamp(80px, 25vw, 120px);
    }

    .header .hd_right {
        gap: 12px;
    }

    .header .hamburger {
        width: 20px;
        gap: 4px;
    }

    .gnb_all_close {
        right: var(--padding-mo);
    }
}