@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700;900&family=Noto+Sans+KR:wght@400;500;700;900&display=swap');

/* =========================================
   1. GLOBAL VARIABLES & RESET
========================================= */
:root {
    --black: #000000;
    --white: #ffffff;
    --gray: #888888;
    --light-gray: #f4f4f4;
    --dark-gray: #1a1a1a;
    --border: #e0e0e0;
}

* { box-sizing: border-box; }

body, html {
    margin: 0; padding: 0;
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    background-color: var(--white);
    color: var(--black);
    word-break: keep-all;
    overflow-x: hidden;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

.container { max-width: 1600px; margin: 0 auto; padding: 0 5%; }
.section-padding { padding: 200px 0; }
.border-bottom { border-bottom: 1px solid var(--border); }

/* Typography */
.huge-title { font-size: clamp(3.5rem, 8vw, 8rem); line-height: 1; font-weight: 900; letter-spacing: -0.04em; margin: 0; text-transform: uppercase; }
.big-text { font-size: clamp(1.5rem, 3.5vw, 3rem); line-height: 1.4; font-weight: 700; letter-spacing: -0.03em; margin: 0; }
.section-label { display: block; padding: 100px 5% 40px 5%; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.25em; font-weight: 800; color: var(--gray); }

/* Scroll Reveal Animations */
.reveal { opacity: 0; transform: translateY(40px); transition: all 1s cubic-bezier(0.16, 1, 0.3, 1); }
.reveal.active { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }

/* =========================================
   2. HEADER (Navigation) & FOOTER
========================================= */
nav {
    position: fixed; top: 0; width: 100%; height: 90px;
    display: flex; justify-content: space-between; align-items: center;
    padding: 0 5%; 
    background: rgba(255,255,255,0.95); 
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    z-index: 1000; border-bottom: 1px solid transparent; transition: all 0.3s ease;
}
nav.scrolled { border-bottom: 1px solid var(--border); }
nav .logo { font-weight: 900; font-size: 1.5rem; letter-spacing: -0.04em; cursor: pointer; transition: transform 0.3s ease; color: var(--black); text-decoration: none;}
nav .logo:hover { transform: scale(1.05); }

.menu { display: flex; gap: 50px; font-weight: 700; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; }
.menu a, .menu span { color: var(--black); text-decoration: none; transition: opacity 0.3s; cursor: pointer; position: relative; white-space: nowrap; }
.menu a::after, .menu span::after { content: ''; position: absolute; left: 0; bottom: -5px; width: 0; height: 2px; background: var(--black); transition: width 0.3s ease; }
.menu a:hover::after, .menu span:hover::after, .menu a.active::after { width: 100%; }
.menu a:hover, .menu span:hover { opacity: 0.7; }

footer { padding: 80px 5%; border-top: 1px solid var(--border); font-size: 1rem; font-weight: 700; color: var(--black); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 20px; }

/* =========================================
   3. MAIN PAGE (Index) SPECIFIC
========================================= */
.switch-bar { 
    position: fixed; top: 90px; width: 100%; 
    background: rgba(255,255,255,0.95); 
    backdrop-filter: blur(15px); 
    -webkit-backdrop-filter: blur(15px);
    padding: 20px 5%; 
    display: flex; justify-content: center; z-index: 998; border-bottom: 1px solid var(--border); transition: top 0.3s ease;
}
.switch-container { position: relative; display: flex; align-items: center; background: var(--light-gray); border-radius: 60px; padding: 8px; cursor: pointer; width: 100%; max-width: 700px; border: 1px solid var(--border); }
.switch-label { flex: 1; position: relative; padding: 18px 0; font-size: 0.95rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.1em; z-index: 2; transition: color 0.3s ease; color: var(--gray); text-align: center; }
.switch-label.active { color: var(--white); }
.switch-bg { position: absolute; top: 8px; bottom: 8px; background: var(--black); border-radius: 50px; transition: all 0.4s cubic-bezier(0.77, 0, 0.175, 1); z-index: 1; }

.mode-container { height: 0; overflow: hidden; opacity: 0; transition: opacity 0.5s ease; visibility: hidden; }
.mode-container.active { height: auto; overflow: visible; opacity: 1; padding-top: 220px; visibility: visible; }

.works-grid-3x5 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 60px 30px; padding: 0 5%; margin-bottom: 100px;}
.creative-video-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 80px 40px; padding: 0 5%; margin-bottom: 150px; }
.work-card, .creative-video-card { display: flex; flex-direction: column; transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1); cursor: pointer; }
.work-card:hover, .creative-video-card:hover { transform: translateY(-10px); }
.video-box { width: 100%; padding-bottom: 56.25%; background-color: var(--light-gray); margin-bottom: 20px; position: relative; overflow: hidden; border: 1px solid var(--border); }
.video-box iframe, .video-box img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none; object-fit: cover; transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1); }
.work-card:hover .video-box img { transform: scale(1.05); }

.impact-tag { display: inline-block; font-size: 0.75rem; font-weight: 800; letter-spacing: 0.05em; padding: 6px 12px; margin-bottom: 12px; border: 1px solid var(--black); text-transform: uppercase; width: fit-content; transition: background-color 0.3s; }
.tag-sales { background: var(--black); color: var(--white); }
.tag-traffic { background: transparent; color: var(--black); border-style: dashed; }
.tag-gov { background: var(--light-gray); color: var(--black); border-color: var(--light-gray); }

/* IP Assets */
.ip-section { background-color: var(--black); color: var(--white); padding: 100px 5% 150px 5%; margin-top: 100px; }
.ip-category-title { font-size: 1.5rem; font-weight: 800; margin-bottom: 30px; display: flex; align-items: center; gap: 15px; border-bottom: 1px solid #333; padding-bottom: 20px; }
.ip-badge { font-size: 0.8rem; font-weight: 700; color: #aaa; letter-spacing: 0.05em; background: #222; padding: 6px 15px; border-radius: 50px; text-transform: uppercase; }

.ip-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin-bottom: 100px; }
.ip-card { background-color: #111; display: flex; flex-direction: column; overflow: hidden; transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1); cursor: pointer; }
.ip-card:hover { transform: translateY(-10px); background-color: #1a1a1a; box-shadow: 0 15px 40px rgba(0,0,0,0.8); }
.ip-img-wrapper { width: 100%; aspect-ratio: 1/1; overflow: hidden; background-color: #222; }
.ip-img { width: 100%; height: 100%; background-size: cover; background-position: center; transition: transform 0.6s ease; }
.ip-card:hover .ip-img { transform: scale(1.08); }
.ip-info { padding: 30px; display: flex; flex-direction: column; justify-content: center; flex: 1; }
.ip-info h4 a { color: var(--white); text-decoration: none; transition: color 0.3s; }
.ip-card:hover h4 a { color: #ff3333; }
.ip-info h4 span { font-size: 1rem; color: #ff3333; font-weight: 900; background: rgba(255,51,51,0.1); padding: 5px 10px; border-radius: 4px; }

.ip-grid-compact { display: grid; grid-template-columns: repeat(10, 1fr); gap: 10px; margin-bottom: 50px; }
.ip-card-compact { background-color: #0a0a0a; display: flex; flex-direction: column; overflow: hidden; transition: all 0.3s ease; }
.ip-card-compact:hover { transform: translateY(-5px) scale(1.1); box-shadow: 0 15px 30px rgba(0,0,0,0.9); z-index: 20; position: relative; }
.ip-card-compact .ip-img { width: 100%; aspect-ratio: 1/1; background-color: #222; background-size: cover; background-position: center; border-bottom: 1px solid #1a1a1a; transition: transform 0.4s ease; }
.ip-card-compact:hover .ip-img { transform: scale(1.1); }
.ip-card-compact .ip-info { padding: 12px 8px; text-align: center; background-color: #0a0a0a; z-index: 2; }
.ip-card-compact h4 a { color: var(--white); text-decoration: none; transition: color 0.3s;}
.ip-card-compact:hover h4 a { color: #ff3333; }

/* =========================================
   4. ABOUT PAGES SPECIFIC (텍스트 사이즈 Contact와 동일하게 최적화)
========================================= */
.hero { padding: 200px 0 100px 0; text-align: left; }
.hero.center { text-align: center; } 
.hero .subtitle { font-size: clamp(1.1rem, 2vw, 1.4rem); color: var(--gray); font-weight: 500; margin-top: 30px; max-width: 1000px; line-height: 1.6; letter-spacing: -0.02em; }

/* 수식 섹션 축소 */
.formula-section { background-color: var(--black); color: var(--white); text-align: center; }
.formula-container { display: flex; flex-direction: column; align-items: center; gap: 15px; }
.formula-item { font-size: clamp(1.8rem, 4vw, 3.5rem); font-weight: 900; letter-spacing: -0.03em; line-height: 1; transition: transform 0.5s ease; }
.formula-operator { font-size: clamp(1.5rem, 3vw, 2.5rem); font-weight: 300; color: #555; }
.formula-result { color: var(--white); border-bottom: 4px solid var(--white); padding-bottom: 10px; display: inline-block;}
.formula-item:hover { transform: scale(1.05); color: #ccc; }
.formula-result:hover { color: var(--white); transform: scale(1.1); }

/* 매트릭스 섹션 축소 */
.matrix-row { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; padding: 60px 0; border-bottom: 1px solid var(--border); transition: background-color 0.4s ease, padding-left 0.4s ease; }
.matrix-row:hover { background-color: var(--light-gray); padding-left: 2%; cursor: default; }
.matrix-header { font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.2em; font-weight: 700; color: var(--gray); margin-bottom: 15px; display: block; }
.legacy-text { color: #ccc; text-decoration: line-through; transition: color 0.3s; font-size: clamp(1.2rem, 2.5vw, 2rem); }
.gw-text { color: var(--black); transition: transform 0.3s; transform-origin: left; font-size: clamp(1.2rem, 2.5vw, 2rem); font-weight: 700; letter-spacing: -0.03em; margin: 0; line-height: 1.4; }
.matrix-row:hover .gw-text { transform: scale(1.02); }

/* 프로세스(Core Values) 축소 */
.process-list { display: flex; flex-direction: column; }
.process-item { display: grid; grid-template-columns: 150px 1fr; gap: 40px; padding: 80px 0; border-bottom: 1px solid var(--border); align-items: flex-start; }
.process-num { font-size: clamp(3rem, 6vw, 4.5rem); font-weight: 900; line-height: 1; letter-spacing: -0.04em; color: var(--border); transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1); }
.process-item:hover .process-num { color: var(--black); transform: translateX(10px); }
.process-content h3 { font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 900; margin: 0 0 15px 0; letter-spacing: -0.03em; transition: transform 0.4s ease; transform-origin: left;}
.process-item:hover .process-content h3 { transform: translateX(10px); }
.process-content p { font-size: 1.05rem; color: var(--gray); margin: 0; line-height: 1.6; font-weight: 500; letter-spacing: -0.02em; }
.process-content p strong { color: var(--black); display: block; margin-bottom: 8px; font-size: 1.1rem; }

/* Marquee / CTA 축소 */
.cta-section { text-align: center; padding: 200px 0; background-color: var(--light-gray); position: relative; overflow: hidden; }
.marquee-bg { position: absolute; top: 50%; left: 0; transform: translateY(-50%); width: 100vw; overflow: hidden; opacity: 0.04; z-index: 0; pointer-events: none; }
.marquee-content { display: flex; width: max-content; animation: scroll-left 30s linear infinite; }
.marquee-content h2 { font-size: clamp(6rem, 12vw, 10rem); font-weight: 900; margin: 0; padding-right: 50px; line-height: 1; letter-spacing: -0.05em; white-space: nowrap; }
@keyframes scroll-left { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
.cta-content a { display: inline-block; margin-top: 30px; font-size: 1.1rem; font-weight: 900; color: var(--white); background-color: var(--black); padding: 20px 50px; text-decoration: none; text-transform: uppercase; border-radius: 100px; transition: all 0.4s; box-shadow: 0 10px 30px rgba(0,0,0,0.1); }
.cta-content a:hover { transform: translateY(-5px) scale(1.05); box-shadow: 0 15px 30px rgba(0,0,0,0.2); }

/* =========================================
   5. CONTACT PAGE SPECIFIC
========================================= */
.contact-row { display: grid; grid-template-columns: 280px 1fr; padding: 80px 0; border-bottom: 1px solid var(--border); align-items: center; transition: background-color 0.4s ease; text-decoration: none; color: var(--black); }
.contact-row:hover { background-color: var(--light-gray); cursor: pointer; }
.contact-label { font-size: 1rem; text-transform: uppercase; letter-spacing: 0.2em; font-weight: 700; color: var(--gray); transition: color 0.3s ease; }
.contact-value { font-size: clamp(1.8rem, 4vw, 3.5rem); font-weight: 900; letter-spacing: -0.03em; margin: 0; transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), color 0.3s ease; transform-origin: left; display: flex; align-items: center; gap: 15px; word-break: break-all; }
.contact-value .arrow { font-size: clamp(1.5rem, 3vw, 2.5rem); font-weight: 300; opacity: 0; transform: translateX(-20px) rotate(45deg); transition: all 0.4s ease; }
.contact-row:hover .contact-label { color: var(--black); }
.contact-row:hover .contact-value { transform: translateX(15px); color: var(--gray); }
.contact-row:hover .contact-value .arrow { opacity: 1; transform: translateX(0) rotate(45deg); color: var(--black); }
.contact-desc { font-size: 1rem; color: var(--gray); margin-top: 12px; font-weight: 500; line-height: 1.5; }

.marquee-section { padding: 100px 0; background-color: var(--black); color: var(--white); overflow: hidden; position: relative; display: flex; align-items: center; justify-content: center; height: 350px; }
.marquee-section .marquee-content h2 { font-size: clamp(4rem, 8vw, 8rem); -webkit-text-stroke: 1px rgba(255,255,255,0.15); color: transparent; }
.marquee-overlay-text { position: absolute; font-size: clamp(1.5rem, 2.5vw, 2.5rem); font-weight: 900; letter-spacing: -0.02em; text-align: center; }

/* =========================================
   6. RESPONSIVE (MOBILE & TABLET 완벽 대응)
========================================= */

/* 태블릿 환경 (1024px 이하) */
@media (max-width: 1024px) {
    /* 기존: 메뉴를 숨겼으나, 이제는 살려서 스와이프 가능하게 변경 */
    .menu { gap: 30px; font-size: 0.8rem; }
    
    .works-grid-3x5 { grid-template-columns: repeat(2, 1fr); }
    .creative-video-grid { grid-template-columns: 1fr; }
    .ip-grid-compact { grid-template-columns: repeat(5, 1fr); }
    
    /* 좌우 그리드를 상하 1단으로 풀기 */
    .matrix-row, .process-item, .contact-row { grid-template-columns: 1fr; gap: 20px; padding: 60px 0; }
    
    /* 호버 액션은 모바일 터치 환경에서 방해되므로 리셋 */
    .process-item:hover .process-num, .contact-row:hover .contact-value { transform: none; }
    .contact-value .arrow { display: none; } 
    .matrix-row:hover { padding-left: 0; background-color: transparent; }
}

/* 모바일 환경 (768px 이하) - 완전 최적화 */
@media (max-width: 768px) {
    /* 1. 네비게이션 & 스위치 바 레이아웃 재배치 */
    nav { height: auto; flex-direction: column; padding: 15px 5%; gap: 15px; align-items: flex-start; }
    nav .logo { font-size: 1.3rem; }
    
    /* 모바일에서는 메뉴가 가로로 스크롤되도록 설정 (터치 친화적) */
    .menu { width: 100%; justify-content: flex-start; overflow-x: auto; padding-bottom: 5px; -webkit-overflow-scrolling: touch; }
    .menu::-webkit-scrollbar { display: none; } /* 스크롤바 숨김 */
    
    /* 헤더가 커졌으므로 스위치 바와 본문 여백 하향 조정 */
    .switch-bar { top: 95px; padding: 15px 5%; }
    .switch-label { padding: 12px 0; font-size: 0.8rem; }
    .mode-container.active { padding-top: 180px; }

    /* 2. 전반적인 여백 축소 */
    .section-padding { padding: 80px 0; }
    .hero { padding: 120px 0 80px 0; }
    .ip-section { padding: 80px 5% 100px 5%; margin-top: 60px; }
    .works-grid-3x5 { margin-bottom: 50px; }

    /* 3. 그리드를 무조건 1열로 변경 */
    .works-grid-3x5 { grid-template-columns: 1fr; }
    .ip-grid { grid-template-columns: 1fr; gap: 30px; }
    .ip-grid-compact { grid-template-columns: repeat(3, 1fr); gap: 15px; } /* 객원 리스트는 3열로 */

    /* 4. 글자 크기 모바일 황금비율 최적화 */
    .huge-title { font-size: clamp(2.8rem, 10vw, 4rem); }
    .big-text { font-size: 1.2rem; }
    .formula-item { font-size: 2.5rem; }
    .formula-operator { font-size: 1.5rem; }
    .process-num { font-size: 4rem; }
    .process-content h3 { font-size: 1.5rem; }
    .contact-value { font-size: clamp(1.2rem, 6vw, 2rem); }
    .section-label { padding: 60px 5% 30px 5%; }

    /* 5. 마키(흐르는 텍스트) 영역 축소 */
    .marquee-section { height: 200px; padding: 50px 0; }
    .cta-section { padding: 120px 0; }
}