*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    :root {
      --cyan: #00d4ff; --cyan-soft: #29b6e8;
      --white: #ffffff; --off-white: #f5f6fa;
      --gray-light: #e8eaf2; --gray-mid: #9099b5;
      --dark: #111827; --text-body: #444c6a;
    }
    html { scroll-behavior: smooth; }
    body { font-family: 'Noto Sans KR','Outfit',sans-serif; color: var(--dark); background: var(--white); overflow-x: hidden; }
 
    /* ── NAV ── */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      display: flex; align-items: center; justify-content: space-between;
      padding: 0 120px 0 56px; height: 68px;
      background: rgba(10, 10, 10, 0.103);
      backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(255,255,255,0.12);
      transition: background 0.3s, border-color 0.3s;
    }
    nav.scrolled { background: rgba(255,255,255,0.96); border-bottom: 1px solid var(--gray-light); box-shadow: 0 2px 20px rgba(26,31,110,0.08); }
    .logo { display: flex; align-items: center; text-decoration: none; }
    .logo-text { font-family: 'Montserrat',serif; font-size: 1.7rem; font-weight: 700; color: var(--cyan); letter-spacing: -0.5px; }
    .logo-text em { font-style: normal; color: rgba(255,255,255,0.9); }
    nav.scrolled .logo-text em { color: #1a1f6e; }
 
    .nav-links { display: flex; gap: 42px; list-style: none; }
    .nav-links > li { position: relative; }
    .nav-links > li > a {
      display: flex; align-items: center; gap: 5px;
      color: rgba(255,255,255,0.88); text-decoration: none;
      font-size: 0.92rem; font-weight: 500; letter-spacing: 0.02em;
      transition: color 0.2s;
    }
    nav.scrolled .nav-links > li > a { color: var(--dark); }
    .nav-links > li > a:hover { color: var(--cyan); }
    .dropdown-arrow {
      display: inline-block; width: 0; height: 0;
      border-left: 4px solid transparent; border-right: 4px solid transparent;
      border-top: 5px solid rgba(255,255,255,0.7);
      transition: transform 0.25s, border-top-color 0.2s;
    }
    nav.scrolled .dropdown-arrow { border-top-color: rgba(30,40,100,0.55); }
    .nav-links li:hover .dropdown-arrow { transform: rotate(180deg); border-top-color: var(--cyan); }
    .dropdown {
      position: absolute; top: 100%; left: 50%;
      transform: translateX(-50%) translateY(-4px);
      min-width: 160px; padding-top: 14px;
      opacity: 0; pointer-events: none;
      transition: opacity 0.22s, transform 0.22s; z-index: 200;
    }
    .dropdown-inner {
      background: rgba(255,255,255,0.97); border-radius: 10px;
      box-shadow: 0 12px 40px rgba(26,31,110,0.13); border: 1px solid rgba(200,210,240,0.35); overflow: hidden;
    }
    .nav-links li:hover .dropdown { opacity: 1; pointer-events: all; transform: translateX(-50%) translateY(0); }
    .dropdown a {
      display: flex; align-items: center; gap: 9px; padding: 11px 18px;
      color: var(--text-body)!important; font-size: 0.84rem; font-weight: 500;
      text-decoration: none; border-bottom: 1px solid rgba(220,225,240,0.5);
      transition: background 0.15s, color 0.15s, padding-left 0.15s; white-space: nowrap;
    }
    .dropdown a:last-child { border-bottom: none; }
    .dropdown a:hover { background: rgba(41,182,232,0.07); color: var(--cyan-soft)!important; padding-left: 22px; }
    .dd-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--cyan-soft); flex-shrink: 0; opacity: 0.6; }
 
    /* ── HAMBURGER ── */
    .hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; background: none; border: none; z-index: 110; }
    .hamburger span { display: block; width: 24px; height: 2px; background: rgba(255,255,255,0.88); border-radius: 2px; transition: all 0.3s; }
    nav.scrolled .hamburger span { background: var(--dark); }
    .hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .hamburger.open span:nth-child(2) { opacity: 0; }
    .hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
 
    /* ── MOBILE MENU ── */
    .mobile-menu {
      display: none; position: fixed; top: 68px; left: 0; right: 0; bottom: 0;
      background: rgba(10,14,30,0.97); backdrop-filter: blur(20px); z-index: 99;
      overflow-y: auto; padding: 24px 0 40px;
      transform: translateX(100%); transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
    }
    .mobile-menu.open { transform: translateX(0); }
    .mobile-menu-list { list-style: none; }
    .mobile-menu-item { border-bottom: 1px solid rgba(255,255,255,0.06); }
    .mobile-menu-top { display: flex; align-items: center; justify-content: space-between; padding: 16px 28px; cursor: pointer; }
    .mobile-menu-top > span { color: rgba(255,255,255,0.88); font-size: 1rem; font-weight: 500; }
    .mobile-chevron { width: 0; height: 0; border-left: 5px solid transparent; border-right: 5px solid transparent; border-top: 6px solid rgba(255,255,255,0.5); transition: transform 0.25s; }
    .mobile-menu-item.open .mobile-chevron { transform: rotate(180deg); border-top-color: var(--cyan); }
    .mobile-submenu { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
    .mobile-menu-item.open .mobile-submenu { max-height: 300px; }
    .mobile-submenu a { display: flex; align-items: center; gap: 10px; padding: 13px 28px 13px 40px; color: rgba(255,255,255,0.55); text-decoration: none; font-size: 0.9rem; transition: color 0.2s; border-top: 1px solid rgba(255,255,255,0.04); }
    .mobile-submenu a:hover { color: var(--cyan); }
    .mobile-submenu .dd-dot { width: 5px; height: 5px; }
 
    /* ── HERO / SLIDER ── */
    .hero { position: relative; height: 100vh; min-height: 560px; overflow: hidden; }
 
    /* 트랙: 슬라이드를 가로로 나란히 배치 */
    .slider-track { display: flex; height: 100%; will-change: transform; }
 
    /* 각 슬라이드 – 너비는 JS 가 100vw 로 설정 */
    .slide { flex-shrink: 0; position: relative; height: 100%; display: flex; align-items: center; overflow: hidden; }
 
    .slide-1 { background-image: url('bgimg/main1.jpg'); background-size: cover; background-position: center center; }
    .slide-2 { background: linear-gradient(135deg,#0a2a1a 0%,#0f5c38 40%,#1a9c60 65%,#52c896 90%); }
    .slide-3 { background-image: url('bgimg/main3.jpg'); background-size: cover; background-position: center center; }
    .slide-2 .slide-circle { background: radial-gradient(circle,rgba(80,220,160,0.22) 0%,rgba(20,160,100,0.12) 45%,transparent 72%); border-color: rgba(100,220,170,0.18); }
  
 
    .slide-hex { position: absolute; left: 2vw; bottom: 8%; width: 240px; opacity: 0.16; pointer-events: none; z-index: 1; }
    .slide-device { position: absolute; right: 6vw; top: 50%; transform: translateY(-50%); z-index: 2; opacity: 0.85; }
    .slide-content { position: relative; z-index: 3; padding-left: 8vw; max-width: 520px; }
 
    /* 텍스트 입장 애니메이션 */
    .slide-eyebrow, .slide-title, .slide-sub, .btn-primary {
      opacity: 0; transform: translateY(20px);
      transition: opacity 0.55s ease, transform 0.55s ease;
    }
    .slide.active .slide-eyebrow { opacity: 1; transform: translateY(0); transition-delay: 0.05s; }
    .slide.active .slide-title   { opacity: 1; transform: translateY(0); transition-delay: 0.18s; }
    .slide.active .slide-sub     { opacity: 1; transform: translateY(0); transition-delay: 0.30s; }
    .slide.active .btn-primary   { opacity: 1; transform: translateY(0); transition-delay: 0.42s; }
 
    .slide-eyebrow { font-size: 1.28rem; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--cyan); margin-bottom: 16px; }
    .slide-2 .slide-eyebrow { color: #52e8a8; }
    .slide-3 .slide-eyebrow { color: #d89cee; }
    .slide-title { font-family: 'Montserrat',serif; font-size: clamp(2.4rem,6.5vw,5.5rem); color: var(--white); line-height: 1.05; margin-bottom: 16px; }
    .slide-title em { font-style: italic; color: var(--cyan); }
    .slide-2 .slide-title em { color: #52e8a8; }
    .slide-3 .slide-title em { color: #d89cee; }
    .slide-sub { font-size: clamp(0.85rem,1.4vw,1rem); line-height: 1.7; color: rgba(255,255,255,0.72); margin-bottom: 32px; max-width: 400px; }
    .btn-primary {
      display: inline-flex; align-items: center; gap: 8px; padding: 13px 28px;
      border: 1.5px solid rgba(255,255,255,0.55); border-radius: 50px;
      color: var(--white); font-size: 0.9rem; font-weight: 500; text-decoration: none;
      transition: background 0.25s, border-color 0.25s;
    }
    .btn-primary:hover { background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.85); }
 
    /* 슬라이더 컨트롤 */
    .slider-prev, .slider-next {
      position: absolute; top: 50%; transform: translateY(-50%); z-index: 10;
      width: 44px; height: 44px; border-radius: 50%;
      background: rgba(255,255,255,0.12); border: 1.5px solid rgba(255,255,255,0.28);
      color: var(--white); font-size: 1rem; cursor: pointer;
      display: flex; align-items: center; justify-content: center;
      transition: background 0.2s; backdrop-filter: blur(8px);
    }
    .slider-prev { left: 24px; }
    .slider-next { right: 24px; }
    .slider-prev:hover, .slider-next:hover { background: rgba(255,255,255,0.28); }
    .slider-dots { position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%); z-index: 10; display: flex; gap: 10px; }
    .dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(255,255,255,0.35); border: 1.5px solid rgba(255,255,255,0.5); cursor: pointer; transition: background 0.25s, transform 0.25s; }
    .dot.active { background: var(--white); transform: scale(1.3); }
    .slider-progress { position: absolute; bottom: 0; left: 0; height: 3px; background: rgba(255,255,255,0.5); z-index: 10; width: 0%; }
    .slide-counter { position: absolute; bottom: 22px; right: 32px; z-index: 10; font-size: 0.75rem; color: rgba(255,255,255,0.55); letter-spacing: 0.1em; }
    .slide-counter strong { color: rgba(255,255,255,0.9); font-weight: 600; }
 
    /* ── LINK SECTION ── */
    .section-link { padding: 80px 56px 60px; text-align: center; }
    .section-link h2 { font-family: 'Montserrat',serif; font-size: 2rem; font-weight: 700; color: var(--dark); margin-bottom: 16px; }
    .divider-line { width: 1px; height: 52px; background: linear-gradient(to bottom,var(--gray-mid),transparent); margin: 0 auto 48px; }
    .cards-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; max-width: 1200px; margin: 0 auto; }
    .card { position: relative; border-radius: 12px; overflow: hidden; aspect-ratio: 3/4; cursor: pointer; }
    .card-placeholder { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; overflow: hidden; }
    .card-placeholder img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.45s; }
    .card:hover .card-placeholder img { transform: scale(1.06); }
    .card-1 .card-placeholder { background: linear-gradient(160deg,#c9d4f0 0%,#8fa5dd 100%); }
    .card-2 .card-placeholder { background: linear-gradient(160deg,#d6e4f0 0%,#9ab8d8 100%); }
    .card-3 .card-placeholder { background: linear-gradient(160deg,#c5d8f5 0%,#7aaed4 100%); }
    .card-4 .card-placeholder { background: linear-gradient(160deg,#ccd5e8 0%,#8090b8 100%); }
    .card-overlay { position: absolute; bottom: 0; left: 0; right: 0; background: linear-gradient(to top,rgba(0,0,0,0.72) 0%,transparent 100%); padding: 28px 20px 20px; display: flex; flex-direction: column; gap: 10px; align-items: flex-start; }
    .card-overlay h3 { font-family: 'Outfit',sans-serif; font-size: 1.05rem; font-weight: 700; color: var(--white); letter-spacing: 0.04em; text-transform: uppercase; }
    .btn-card { display: inline-flex; align-items: center; gap: 6px; padding: 8px 18px; background: black; border-radius: 50px; color: var(--white); font-size: 0.8rem; font-weight: 500; text-decoration: none; transition: background 0.2s, color 0.2s; }
    .btn-card:hover { background: var(--white); color: var(--dark); }
 
    /* ── PARTNER ── */
    .section-partner { background: var(--off-white); display: grid; grid-template-columns: 1fr 1fr; min-height: 380px; }
    .partner-text { padding: 80px 72px 80px 8vw; display: flex; flex-direction: column; justify-content: center; }
    .partner-text h2 { font-family: 'Montserrat',serif; font-size: clamp(1.6rem,2.8vw,2.2rem); color: var(--cyan-soft); margin-bottom: 22px; line-height: 1.25; }
    .partner-text p { font-size: 0.97rem; line-height: 1.75; color: var(--text-body); max-width: 380px; }
    .partner-img { position: relative; overflow: hidden; min-height: 300px; }
    .partner-img-placeholder { position: absolute; inset: 0; background-size: cover; background-image: url('bgimg/partner_biota.jpg');}
 
    /* ── FOOTER ── */
  footer {
    background: #111520; color: rgba(255,255,255,0.55);
    padding: 52px 56px 32px;
    display: flex; flex-direction: column; align-items: center;
  }
  .footer-top {
    display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
    gap: 32px; border-bottom: 1px solid rgba(255,255,255,0.08);
    padding-bottom: 36px; margin-bottom: 24px;
    width: 100%; max-width: 1280px;
  }
  .footer-brand .logo { font-size: 1.4rem; margin-bottom: 20px; display: block; color: var(--cyan); }
  .footer-brand .logo span { color: rgba(255,255,255,0.7); }
  .contact-label { font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(255,255,255,0.35); margin-bottom: 12px; }
  .contact-info p { font-size: 0.8rem; line-height: 1.9; color: rgba(255,255,255,0.5); }
  .footer-col {text-align: center;}
  .footer-col h4 { font-size: 0.82rem; font-weight: 600; color: rgba(255,255,255,0.8); margin-bottom: 14px; }
  .footer-col ul { list-style: none;}
  .footer-col ul li { margin-bottom: 9px; }
  .footer-col ul li a { color: rgba(255,255,255,0.45); text-decoration: none; font-size: 0.82rem; transition: color 0.2s; }
  .footer-col ul li a:hover { color: var(--cyan); }
  .footer-bottom { font-size: 0.75rem; color: rgba(255,255,255,0.25); text-align: center; width: 100%; max-width: 1280px; }
 
  /* ════════════════════════════════════════════
     SCROLL ANIMATIONS  (stye.css .reveal)
  ════════════════════════════════════════════ */
  .reveal {
    opacity: 0; transform: translateY(24px);
    transition: opacity 0.65s ease, transform 0.65s ease;
  }
  .reveal.visible { opacity: 1; transform: translateY(0); }
 
  .reveal-left  { opacity: 0; transform: translateX(-28px); transition: opacity 0.7s ease, transform 0.7s ease; }
  .reveal-left.visible  { opacity: 1; transform: none; }
  .reveal-right { opacity: 0; transform: translateX(28px);  transition: opacity 0.7s ease, transform 0.7s ease; }
  .reveal-right.visible { opacity: 1; transform: none; }
 
  .d1 { transition-delay: 0.07s; }
  .d2 { transition-delay: 0.16s; }
  .d3 { transition-delay: 0.25s; }
  .d4 { transition-delay: 0.34s; }
  .d5 { transition-delay: 0.43s; }
 

  /* ════════════════════════════════════════════
     RESPONSIVE — 태블릿 세로 (≤900px)
  ════════════════════════════════════════════ */
  @media (max-width: 900px) {
    nav { padding: 0 24px; }
    .nav-links { display: none; }
    .hamburger { display: flex; }
    .mobile-menu { display: block; }
    /* 이미지 상단, 콘텐츠 하단 — flex-end로 텍스트를 아래쪽에 */
    .slide { align-items: flex-end; }
    .slide-1 {background-image: url(bgimg/main1x900.jpg);}
    .slide-content {
      position: relative; z-index: 3;
      padding: 0 32px 120px;
      max-width: 100%;
    }
    
    /* 화살표: 콘텐츠 시작 바로 위 (하단에서 고정) */
    .slider-prev, .slider-next {
      top: auto; transform: none;
      bottom: 420px;
      width: 40px; height: 40px;
    }
    .slider-prev { left: 20px; }
    .slider-next { right: 20px; }
    .slide-device { display: none; }
    .section-link { padding: 60px 24px 40px; }
    .cards-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .section-partner { grid-template-columns: 1fr; }
    .partner-text { padding: 60px 28px; }
    .partner-img { min-height: 260px; }
    footer { padding: 40px 24px 24px; align-items: stretch; }
    .footer-top { grid-template-columns: 1fr 1fr; gap: 28px; width: 100%; max-width: 100%; }
    .footer-brand { grid-column: 1 / -1; }
    .footer-col { text-align: left; }
    .footer-bottom { text-align: left; width: 100%; max-width: 100%; }
  }
 
  /* ════════════════════════════════════════════
     RESPONSIVE — 모바일 (≤640px)
  ════════════════════════════════════════════ */
  @media (max-width: 640px) {
    nav { padding: 0 16px; height: 60px; }
    .mobile-menu { top: 60px; }
    .hero { min-height: 70svh; height: 600px; }
    /* 이미지 상단 절반, 텍스트 하단 절반 */
    .slide { justify-content: flex-start; align-items: flex-end; }
    .slide-1 {background-image: url(bgimg/main1x640.jpg);}
    .slide-content {
      position: relative; z-index: 3;
      padding: 0 20px 80px;
      max-width: 100%; text-align: left;
    }
    .slide-title { font-size: clamp(2rem, 10vw, 3rem); }
    .slide-sub { font-size: 0.88rem; max-width: 100%; margin-bottom: 20px; }
    .btn-primary { padding: 11px 22px; font-size: 0.85rem; }
    /* 화살표: 텍스트 블록 바로 위 */
    .slider-prev, .slider-next {
      top: auto; transform: none;
      bottom: 380px;
      width: 36px; height: 36px; font-size: 0.85rem;
    }
    .slider-prev { left: 16px; }
    .slider-next { right: 16px; }
    .slide-hex { display: none; }
    .slide-circle { display: none; }
    .section-link { padding: 48px 16px 36px; }
    .section-link h2 { font-size: 1.5rem; }
    .divider-line { margin-bottom: 32px; }
    .cards-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .card { aspect-ratio: 4/5; }
    .card-overlay h3 { font-size: 0.82rem; }
    .btn-card { padding: 6px 14px; font-size: 0.75rem; }
    .partner-text { padding: 48px 20px; }
    .partner-text h2 { font-size: 1.4rem; }
    .partner-text p { font-size: 0.9rem; }
    .partner-img { min-height: 220px; }
    footer { padding: 36px 20px 20px; align-items: stretch; }
    .footer-top { grid-template-columns: 1fr 1fr; gap: 28px; width: 100%; max-width: 100%; }
    .footer-brand { grid-column: 1 / -1; width: 100%; }
    .footer-col { text-align: left; width: 100%; }
    .footer-bottom { text-align: left; width: 100%; max-width: 100%; }
  }
 
  /* ════════════════════════════════════════════
     RESPONSIVE — 소형 모바일 (≤400px)
  ════════════════════════════════════════════ */
  @media (max-width: 400px) {
    .slide { justify-content: flex-start; align-items: flex-end; }
    .slide-content { padding: 0 16px 72px; max-width: 100%; }
    .slide-title { font-size: clamp(1.7rem, 9vw, 2.4rem); }
    .slider-prev, .slider-next {
      top: auto; transform: none;
      bottom: 300px;
      width: 34px; height: 34px;
    }
    .slider-prev { left: 12px; }
    .slider-next { right: 12px; }
    .cards-grid { gap: 8px; }
    .card-overlay { padding: 16px 12px 12px; gap: 6px; }
    .btn-card { display: none; }
    footer { padding: 28px 16px 16px; align-items: stretch; }
    .footer-top { grid-template-columns: 1fr 1fr; gap: 28px; width: 100%; max-width: 100%; }
    .footer-brand { grid-column: 1 / -1; width: 100%; }
    .footer-col { text-align: left; width: 100%; }
    .footer-bottom { text-align: left; width: 100%; max-width: 100%; }
  }