:root {
    --bg-color: #000000;
    --text-main: #ffffff;
    --text-sub: #A3A3A3;
    --border-color: #000000;
    --point-color: #FF7300;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Pretendard', 'Inter', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    width: 100%;
}
body.fade-in { opacity: 1; }
header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 20px 40px; 
    width: 100%;
    position: fixed; top: 0; left: 0; z-index: 100;
    background-color: #000000; 
    transition: transform 0.3s ease-in-out, background-color 0.3s ease;
    height: 90px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
header.header-hidden { transform: translateY(-100%); }
.logo-container { cursor: pointer; }
.logo-img { 
    height: 60px; width: auto; display: block; 
    filter: invert(1) brightness(1.2);
}
nav ul { display: flex; list-style: none; gap: 50px; }
nav ul li { margin-left: 0; }
nav ul li a {
    text-decoration: none; color: var(--text-main);
    font-size: clamp(15px, 1.2vw, 18px); font-weight: 400; 
    display: block; padding: 10px 0; letter-spacing: -0.02em;
    opacity: 0.7; transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative; text-align: center;
}
nav ul li a::before { display: block; content: attr(title); font-weight: 700; height: 0; overflow: hidden; visibility: hidden; }
nav ul li:hover a { transform: translateY(-0.33em); opacity: 1; }
nav ul li.active a { font-weight: 700; opacity: 1; }
nav ul li.active a::after {
    content: ''; display: block; width: 100%; height: 2px; 
    background: currentColor; margin-top: 5px; border-radius: 2px;
}
.back-nav-container {
    width: 100%; max-width: 100%; padding: 0 40px; margin: 0 auto;
    position: -webkit-sticky; position: sticky;
    top: 110px; z-index: 50; height: 0; overflow: visible;
    pointer-events: none; transition: transform 0.3s ease-in-out;
}
.back-nav-container.nav-up { transform: translateY(-100px); }
.back-btn {
    display: flex; justify-content: center; align-items: center;
    width: 48px; height: 48px; 
    border-radius: 50%; 
    border: 2px solid rgba(255, 255, 255, 1); 
    background: rgba(0, 0, 0, 0.24);             
    backdrop-filter: blur(4px);                 
    -webkit-backdrop-filter: blur(4px);         
    text-decoration: none; color: var(--text-main);
    opacity: 1; transition: transform 0.3s ease, background 0.3s ease, border-color 0.3s ease;
    cursor: pointer; pointer-events: auto; transform: translateY(20px); 
}
.back-btn svg {
    width: 18px; height: 18px; fill: none;
    stroke: currentColor; stroke-width: 2; 
    stroke-linecap: round; stroke-linejoin: round;
    display: block; transform: translateX(-1px); 
}
.back-btn:hover {
    transform: translateY(20px) translateX(-3px); 
    background: rgba(255, 255, 255, 0.1); 
    border-color: rgba(255, 255, 255, 0.6);
}

.next-project {
    padding: 140px 40px; text-align: center; cursor: pointer; 
    transition: transform 0.3s ease; margin-top: 60px; 
    position: relative; overflow: hidden; color: #ffffff; 
    isolation: isolate; 
    z-index: 1;
}
.next-project::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-image: var(--next-bg); 
    background-size: cover; background-position: center;
    filter: blur(10px) brightness(0.5); 
    z-index: -1; 
    transform: scale(1.1); transition: filter 0.3s ease, transform 0.3s ease; 
}
.next-project:hover { transform: translateY(-5px); }
.next-project:hover::before { filter: blur(5px) brightness(0.7); transform: scale(1.05); }
.next-label { font-size: 16px; color: rgba(255, 255, 255, 0.8); margin-bottom: 15px; letter-spacing: 0.05em; text-transform: uppercase; }
.next-title { font-size: clamp(32px, 5vw, 72px); font-weight: 800; letter-spacing: -0.02em; }
main { width: 100%; padding-top: 90px; position: relative; }
.hero-section { width: 100%; padding: 0; margin-bottom: 60px; }
.hero-image {
    width: 100%; height: auto; display: block; 
    border-radius: 0; background-color: #1a1a1a;
    object-fit: cover; object-position: center; min-height: 400px;
}
.project-header {
    max-width: 1800px; margin: 0 auto 60px; padding: 0 40px; 
    display: flex; justify-content: space-between; align-items: flex-end;
}
.project-title h1 {
    font-size: clamp(40px, 6vw, 100px); font-weight: 800;
    line-height: 1; letter-spacing: -0.04em; margin: 0; color: var(--text-main);
}
.project-specs {
    text-align: right; font-size: 14px; 
    color: var(--text-sub); line-height: 1.6;
}
.full-image-block { margin-bottom: 60px; width: 100%; }
.full-image-block img { width: 100%; height: auto; display: block; margin-bottom: 20px; }
.full-image-block video.locked-video { width: 100%; height: auto; display: block; margin-bottom: 20px; pointer-events: none; }
video::-webkit-media-controls { display: none !important; }
.banding-fix {
    position: relative;
    width: 100%;
    background-color: #000;
    overflow: hidden;
    margin-bottom: 60px;
}
.banding-fix video {
    display: block;
    width: 100%;
    height: auto;
    position: relative;
    z-index: 1;
    will-change: transform;
    transform: translate3d(0, 0, 0);
}
@media (min-width: 769px) {
    .video-limit-small {
        max-width: 1000px !important;
        margin: 0 auto !important;
    }
}
.banding-fix::after {
    content: "";
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 2;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='1'/%3E%3C/svg%3E");
    opacity: 0.07; 
    mix-blend-mode: overlay; 
}
.graph-block {
    width: 100%; max-width: 800px; margin: 0 auto 40px; 
}
.graph-block video {
    width: 100%; height: auto; display: block; pointer-events: none;
}
.web-constrained-img {
    width: 100%; max-width: 1200px; 
    margin: 0 auto 20px; display: block; height: auto;
}
.solution-logo {
    width: 100%; max-width: 600px; 
    padding: 0 40px; height: auto; display: block; margin: 40px auto 0;
}
.text-right { 
    flex: 1; 
    padding-top: 10px; padding-left: 40px; padding-right: 40px; 
    box-sizing: border-box; max-width: 1200px; margin: 0 auto 60px; 
}
.body-en { font-size: 16px; color: #e0e0e0; line-height: 1.6; margin-bottom: 30px; font-weight: 400; }
.body-kr { font-size: 14px; color: var(--text-sub); line-height: 1.7; font-weight: 300; }
.intro-lead {
    display: block;
    font-size: 24px; font-weight: 700; color: #ffffff;
    line-height: 1.3; margin-bottom: 15px;
}
.highlight-text { color: var(--point-color); font-weight: 700; font-style: italic; }
.highlight-orange { color: var(--point-color); font-weight: 700; }
.title-group {
    width: 100%; text-align: center; padding: 100px 20px 40px; 
    display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.vertical-line { width: 1px; height: 60px; background-color: rgba(255, 255, 255, 0.3); margin: 0 auto 20px auto; }
.small-label { font-size: 16px; color: var(--text-sub); font-weight: 400; margin-bottom: 60px; letter-spacing: 0.05em; text-transform: uppercase; }
.horizontal-line { width: 100%; max-width: 400px; height: 1px; background-color: rgba(255, 255, 255, 0.3); margin: 0 auto 80px auto; }
.main-quote { font-size: clamp(32px, 5vw, 72px); font-weight: 300; color: var(--text-main); line-height: 1.3; letter-spacing: -0.02em; word-break: keep-all; }
.main-quote span.quote-mark { font-family: serif; color: #666; margin: 0 5px; }
.stats-text-container {
    display: flex; justify-content: space-between; align-items: flex-start;
    max-width: 800px; width: 100%; margin: 0 auto 100px; padding: 0 20px; gap: 40px;
}
.stats-text-item { flex: 1; width: 50%; text-align: left; }
.stats-title { font-size: 28px; font-weight: 700; color: var(--text-main); line-height: 1.2; margin-bottom: 8px; letter-spacing: -0.02em; word-break: keep-all; }
.stats-sub { font-size: 15px; color: var(--text-sub); font-weight: 400; margin-bottom: 20px; }
.stats-source { font-size: 13px; color: #666666; font-weight: 300; line-height: 1.4; }
.stats-title .highlight-text { color: var(--point-color); font-style: normal; }
.problem-define-section {
    width: 100%; max-width: 1200px; margin: 40px auto 60px; padding: 0 40px;
    text-align: center; display: flex; flex-direction: column; align-items: center;
}
.problem-label {
    font-size: 24px; font-weight: 700; font-style: italic; color: var(--point-color);
    margin-bottom: 20px; width: 100%; max-width: 800px; text-align: left; padding-left: 10px;
}
.bracket-container { display: inline-block; position: relative; padding: 20px 60px; max-width: 90%; }
.bracket-container::before {
    content: ''; position: absolute; top: 0; left: 0; width: 30px; height: 100%;
    border-left: 6px solid var(--point-color); border-top: 6px solid var(--point-color); border-bottom: 6px solid var(--point-color);
}
.bracket-container::after {
    content: ''; position: absolute; top: 0; right: 0; width: 30px; height: 100%;
    border-right: 6px solid var(--point-color); border-top: 6px solid var(--point-color); border-bottom: 6px solid var(--point-color);
}
.bracket-text {
    font-size: clamp(40px, 5vw, 80px); font-weight: 700; color: var(--point-color);
    line-height: 1.2; text-align: center; margin: 0; letter-spacing: -0.02em;
}
.image-text-split {
    display: flex; align-items: center; justify-content: space-between;
    max-width: 1400px; width: 100%; margin: 0 auto 120px; padding: 0 40px; gap: 80px;
}
.split-image { flex: 1; width: 50%; display: flex; justify-content: center; }
.split-image video, .split-image img { width: 100%; max-width: 550px; height: auto; display: block; border-radius: 0; }
.split-text { flex: 1; width: 50%; padding: 0; box-sizing: border-box; text-align: left; }
.split-heading { font-size: 48px; font-weight: 700; color: var(--text-main); line-height: 1.1; margin-bottom: 10px; letter-spacing: -0.02em; }
.step-label { font-size: 20px; color: #888; font-weight: 300; margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.05em; }
.problem-heading {
    font-size: 42px; font-weight: 700; color: var(--point-color); line-height: 1.2;
    margin-bottom: 30px; position: relative; display: inline-block; font-style: italic;
}
.problem-heading::after { content: ''; display: block; width: 100%; height: 1px; background-color: #666; margin-top: 10px; }
.ref-text { font-size: 13px; color: #555; font-weight: 300; margin-bottom: 30px; font-style: italic; }
.mission-section { text-align: center; width: 100%; max-width: 1200px; margin: 150px auto; padding: 0 20px; }
.mission-text-en { 
    font-size: clamp(20px, 3.2vw, 40px); 
    font-weight: 300; 
    color: var(--text-main); 
    line-height: 1.4; 
    margin: 0; 
    letter-spacing: -0.02em; 
}
.mission-text-en .highlight-orange {
    font-size: clamp(24px, 4vw, 48px);
    font-weight: 700;
    color: var(--point-color);
}
.mission-text-kr { font-size: 15px; color: #666666; font-weight: 300; margin-top: 50px; line-height: 1.6; word-break: keep-all; }
.definition-section {
    display: flex; justify-content: center; align-items: center;
    max-width: 1400px; width: 100%; margin: 150px auto; padding: 0 40px; gap: 80px;
}
.def-left { text-align: left; display: flex; flex-direction: column; justify-content: center; }
.def-lang { font-size: 16px; font-weight: 300; color: #888; margin-bottom: 5px; display: block; }
.def-title { font-size: clamp(60px, 7vw, 120px); font-weight: 200; color: var(--text-main); line-height: 1; margin: 0; letter-spacing: -0.02em; }
.def-meaning { font-size: clamp(30px, 4vw, 50px); font-weight: 700; color: var(--point-color); font-style: italic; margin: 10px 0 0 0; line-height: 1; }
.def-divider { width: 1px; height: 140px; background-color: #444; }
.def-right { text-align: left; display: flex; flex-direction: column; justify-content: center; }
.slogan-sub { font-size: clamp(18px, 2.5vw, 32px); font-weight: 300; color: var(--text-main); margin: 0 0 10px 0; line-height: 1.2; }
.slogan-main { font-size: clamp(40px, 6vw, 100px); font-weight: 700; color: var(--point-color); font-style: italic; line-height: 1; margin: 0; letter-spacing: -0.02em; }
.closing-section {
    max-width: 1200px;
    margin: 100px auto; padding: 0 20px; text-align: center;
}
.closing-block { margin-bottom: 80px; }
.closing-section .mission-text-en { margin-bottom: 10px; }
.closing-section .mission-text-kr { margin-top: 10px; } 
.product-identity-section {
    max-width: 1400px; width: 100%; margin: 150px auto; padding: 0 40px; 
    text-align: left; 
}
.identity-title {
    color: var(--point-color); font-style: italic; line-height: 1.1; margin-bottom: 60px; letter-spacing: -0.02em;
    text-align: left; 
}
.identity-desc { 
    max-width: 800px; margin: 0; text-align: left; 
}
.product-identity-section.centered { text-align: center; }
.product-identity-section.centered .identity-title { text-align: center; }
.product-identity-section.centered .identity-desc { margin: 0 auto; text-align: center; }
.brand-bold { font-size: clamp(60px, 8vw, 120px); font-weight: 800; }
.brand-pipe {
    font-size: clamp(60px, 8vw, 120px); font-weight: 200; margin: 0 10px; color: var(--point-color); vertical-align: top;
}
.brand-thin { font-size: clamp(60px, 8vw, 120px); font-weight: 200; display: block; }
.touching-space-section {
    max-width: 1400px; width: 100%; margin: 60px auto 100px; padding: 0 40px;
    text-align: left;
}
.touching-title {
    font-size: clamp(48px, 6vw, 90px);
    font-weight: 800;
    color: var(--point-color);
    line-height: 1.1;
    margin-bottom: 10px;
}
.touching-sub {
    font-size: clamp(24px, 3vw, 40px);
    font-weight: 300;
    color: var(--text-main);
    margin-bottom: 10px;
}
.touching-kr {
    font-size: 16px;
    color: #888;
    font-weight: 300;
    margin-bottom: 40px;
}
.touching-line {
    width: 200px;
    height: 1px;
    background-color: #666;
}
.credit-section { margin-top: 40px; border-top: 1px solid var(--border-color); padding: 40px 40px 0; max-width: 1800px; margin-left: auto; margin-right: auto; }
.credit-grid { display: grid; grid-template-columns: 180px 1fr; gap: 15px; margin-bottom: 20px; font-size: 15px; line-height: 1.6; }
.credit-label { font-weight: 700; color: var(--text-main); }
.credit-content { font-weight: 300; color: var(--text-sub); }
.hand-tracking-container {
    max-width: 1200px !important; 
    margin: 0 auto 100px;
    width: 100%;
    padding: 0 40px;
}
@media (min-width: 769px) {
    .hand-tracking-container.reverse-desktop {
        display: flex;
        flex-direction: row-reverse; 
        justify-content: space-between; 
        align-items: center;
        gap: 40px;
    }
    .hand-tracking-container .split-text {
        text-align: left;
        flex: 0 0 auto;
        width: auto;
    }
    .hand-tracking-container .split-image {
        flex: 1;
        display: flex;
        justify-content: flex-end;
    }
    .hand-tracking-container .split-image img,
    .hand-tracking-container .split-image video {
        max-width: 650px; 
        width: 100%;
        height: auto;
    }
}
@media (max-width: 768px) {
    header { padding: 15px 20px; flex-direction: column; gap: 15px; height: auto; }
    .logo-img { height: 50px; }
    nav ul { justify-content: center; gap: 25px; }
    nav ul li a { font-size: 16px; font-weight: 500; }
    main { padding-top: 140px; }
    .back-nav-container { top: 150px; padding: 0 20px; }
    .project-header { flex-direction: column; align-items: flex-start; padding: 0 20px; margin-bottom: 60px; }
    .project-specs { text-align: left; margin-top: 20px; }
    .hero-image { height: 80vh; }
    .text-right { flex: 0 0 auto; width: 100%; padding: 0 20px; }
    .credit-section { padding: 40px 20px 0; }
    .credit-grid { grid-template-columns: 1fr; gap: 5px; margin-bottom: 30px; }
    .next-project { padding: 100px 20px; }
    .next-title { font-size: 40px; }
    .title-group { padding: 80px 20px 20px; }
    .vertical-line { height: 40px; }
    .small-label { margin-bottom: 40px; font-size: 14px; }
    .horizontal-line { max-width: 200px; margin-bottom: 50px; }
    .main-quote { font-size: 32px; margin-bottom: 10px; }
    .full-image-block { margin-bottom: 60px; }
    .full-image-block img.mobile-view-img { max-width: 100%; }
    .graph-block { margin-bottom: 20px; }
    .web-constrained-img { max-width: 100%; } 
    .solution-logo { padding: 0 20px; max-width: 80%; }
    .stats-text-container { flex-direction: row !important; gap: 20px; padding: 0 20px; margin-bottom: 80px; }
    .stats-title { font-size: 16px; margin-bottom: 5px; }
    .stats-sub { font-size: 12px; margin-bottom: 10px; }
    .stats-source { font-size: 11px; letter-spacing: -0.05em; }
    .problem-define-section { margin: 20px auto 40px; padding: 0 20px; }
    .problem-label { font-size: 18px; text-align: center; padding-left: 0; margin-bottom: 15px; }
    .bracket-container { padding: 15px 30px; }
    .bracket-container::before, .bracket-container::after { width: 15px; border-width: 4px; }
    .image-text-split { flex-direction: column; gap: 40px; padding: 0; margin-bottom: 80px; }
    .split-image { width: 100%; padding: 0 20px; }
    .split-image video { max-width: 100%; }
    .split-text { width: 100%; padding: 0 20px; }
    .split-heading { font-size: 32px; }
    .problem-heading { font-size: 28px; margin-bottom: 20px; }
    .mission-section { margin: 100px auto; }
    .mission-text-en { line-height: 1.3; }
    .mission-text-kr { font-size: 13px; margin-top: 30px; padding: 0 10px; }
    .pc-break { display: none; }
    .definition-section { flex-direction: column; gap: 40px; margin: 100px auto; text-align: center; }
    .def-left, .def-right { text-align: center; align-items: center; }
    .def-divider { width: 60px; height: 1px; }
    .def-title { font-size: 80px; }
    .def-meaning { font-size: 32px; }
    .slogan-sub { font-size: 20px; }
    .slogan-main { font-size: 50px; }
    .product-identity-section { margin: 100px auto; padding: 0 20px; }
    .brand-bold, .brand-pipe, .brand-thin { font-size: 48px; }
    .touching-space-section { margin: 60px auto; padding: 0 20px; }
    .touching-title { font-size: 48px; }
    .touching-sub { font-size: 24px; }
    .touching-kr { font-size: 14px; }
    .hand-tracking-container .split-heading {
        font-size: 64px !important;
        line-height: 0.9;
        margin-bottom: 20px;
    }
    .hand-tracking-container .body-en {
        font-size: 28px !important;
        line-height: 1.2;
    }
    .hand-tracking-container .body-kr {
        font-size: 16px;
    }
}

/* ▼▼▼ [새로 추가된] 와이드 수직 배치 스타일 ▼▼▼ */
.text-section-vertical-wide {
    width: 100%;
    max-width: 1800px; /* 전체 너비 제한은 유지하되 넓게 */
    margin: 0 auto 80px;
    padding: 0 20px; /* 좌우 패딩을 줄여서 텍스트 영역 확보 */
    display: flex;
    flex-direction: column; /* 세로 배치 */
    align-items: flex-start; /* 좌측 정렬 */
    text-align: left;
}

.vertical-head {
    margin-bottom: 30px; /* 로고와 텍스트 사이 간격 */
    width: 100%;
}

.wide-logo-img {
    width: auto;
    height: auto;
    max-width: 400px; /* 로고 최대 크기 조절 */
    display: block;
}

.vertical-body {
    width: 100%;
    max-width: 100%; /* 텍스트가 부모 넓이를 꽉 채우도록 */
}