/* ===== Reset ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root{
  --primary:#3d85c6;
  --primary-dark:#2a6ca8;
  --bg:#ffffff;
  --bg-alt:#f5f7fa;
  --bg-card:#ffffff;
  --text:#222222;
  --text-sec:#555555;
  --text-muted:#888888;
  --border:#e2e8f0;
  --nav-h:64px;
  --radius:10px;
  --shadow:0 2px 12px rgba(0,0,0,0.06);
}

html{scroll-behavior:smooth}
body{font-family:'Noto Sans KR','Montserrat',sans-serif;background:var(--bg);color:var(--text);line-height:1.75}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;display:block}
.container{max-width:1100px;margin:0 auto;padding:0 24px}

/* ===== Navbar ===== */
.navbar{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(255,255,255,0.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:box-shadow .3s}
.navbar.scrolled{box-shadow:0 2px 20px rgba(0,0,0,0.08)}
.nav-container{max-width:1100px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:var(--nav-h)}
.nav-logo{display:flex;align-items:center;gap:10px;color:var(--text);font-family:'Montserrat',sans-serif;font-weight:800;font-size:1.3rem}
.nav-logo img{height:36px;width:36px;border-radius:8px;object-fit:cover}
.nav-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.4rem;cursor:pointer}
.nav-menu{display:flex;list-style:none;gap:2px}
.nav-link{color:var(--text-sec);font-family:'Montserrat',sans-serif;font-weight:600;font-size:.85rem;padding:8px 14px;border-radius:6px;transition:all .2s}
.nav-link:hover,.nav-link.active{color:var(--primary);background:rgba(61,133,198,0.08)}

/* ===== Sections ===== */
.section{padding:80px 0}
.page-section{padding-top:calc(var(--nav-h) + 50px)}
.section-title{font-family:'Montserrat',sans-serif;font-size:2rem;font-weight:800;text-align:center;margin-bottom:40px;color:var(--text);position:relative}
.section-title::after{content:'';display:block;width:50px;height:3px;background:var(--primary);margin:12px auto 0;border-radius:2px}

/* ===== Hero ===== */
.hero-section{position:relative;min-height:480px;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden;margin-top:var(--nav-h);padding:0}
.hero-bg{position:absolute;inset:0}
.hero-bg img{width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(to bottom,rgba(0,0,0,0.35),rgba(0,0,0,0.55))}
.hero-content{position:relative;z-index:2;color:#fff;padding:60px 24px}
.hero-title{font-family:'Montserrat',sans-serif;font-size:3.2rem;font-weight:800;line-height:1.2;margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,0.3)}
.hero-subtitle{font-family:'Montserrat',sans-serif;font-size:1.05rem;font-weight:500;letter-spacing:2px;opacity:.9}

/* ===== About ===== */
.about-section{background:var(--bg);padding:70px 0}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.about-image img{border-radius:var(--radius);box-shadow:var(--shadow)}
.about-text h2{font-family:'Montserrat',sans-serif;font-size:1.6rem;font-weight:800;margin-bottom:16px;color:var(--primary)}
.about-text p{color:var(--text-sec);margin-bottom:12px;font-size:.95rem}
.about-stats{display:flex;gap:30px;margin-top:24px}
.stat{text-align:center}
.stat-num{display:block;font-family:'Montserrat',sans-serif;font-size:2rem;font-weight:800;color:var(--primary)}
.stat-label{font-size:.78rem;color:var(--text-muted);font-weight:500}

/* ===== Highlights ===== */
.highlights-section{background:var(--bg-alt);padding:70px 0}
.highlights-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px}
.highlight-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;transition:transform .2s,box-shadow .2s}
.highlight-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.highlight-card p{font-size:.88rem;color:var(--text-sec);margin:8px 0}
.hl-tag{display:inline-block;font-family:'Montserrat',sans-serif;font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.8px;padding:3px 10px;border-radius:4px}
.hl-tag.grant{background:#fff3cd;color:#856404}
.hl-tag.conf{background:#cce5ff;color:#004085}
.hl-tag.paper{background:#d4edda;color:#155724}
.hl-date{font-size:.75rem;color:var(--text-muted);font-weight:600}
.section-action{text-align:center;margin-top:30px}
.btn-more{display:inline-block;padding:10px 28px;border:2px solid var(--primary);color:var(--primary);border-radius:6px;font-family:'Montserrat',sans-serif;font-weight:600;font-size:.88rem;transition:all .2s}
.btn-more:hover{background:var(--primary);color:#fff}

/* ===== Research Preview Cards ===== */
.rp-section{background:var(--bg);padding:70px 0}
.rp-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.rp-card{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:transform .2s,box-shadow .2s;background:var(--bg-card)}
.rp-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,0.08)}
.rp-card img{width:100%;height:180px;object-fit:cover}
.rp-body{padding:18px 20px}
.rp-body h3{font-family:'Montserrat',sans-serif;font-size:1rem;font-weight:700;margin-bottom:6px;color:var(--text)}
.rp-body p{font-size:.82rem;color:var(--text-sec)}

/* ===== News ===== */
.news-list{max-width:900px;margin:0 auto}
.news-row{display:flex;align-items:baseline;gap:12px;padding:14px 0;border-bottom:1px solid var(--border);font-size:.9rem}
.news-date{font-family:'Montserrat',sans-serif;font-weight:700;font-size:.8rem;color:var(--primary);min-width:85px;flex-shrink:0}
.news-tag{display:inline-block;font-family:'Montserrat',sans-serif;font-size:.6rem;font-weight:700;text-transform:uppercase;letter-spacing:.6px;padding:2px 8px;border-radius:3px;min-width:55px;text-align:center;flex-shrink:0}
.news-tag.grant{background:#fff3cd;color:#856404}
.news-tag.conf{background:#cce5ff;color:#004085}
.news-tag.paper{background:#d4edda;color:#155724}
.news-tag.member{background:#e8daef;color:#6c3483}
.news-tag.lab{background:#fce4ec;color:#c0392b}

/* ===== People ===== */
.director-card{display:flex;gap:36px;background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);padding:36px;margin-bottom:40px;align-items:center}
.director-photo img{width:180px;height:220px;object-fit:cover;border-radius:var(--radius)}
.director-info h3{font-family:'Montserrat',sans-serif;font-size:1.5rem;font-weight:800}
.name-kr{font-size:.75em;color:var(--text-muted);font-weight:400;margin-left:6px}
.role{color:var(--primary);font-weight:500;margin:4px 0}
.dept,.affil{font-size:.88rem;color:var(--text-sec)}
.interest-tags{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0}
.interest-tags span{background:rgba(61,133,198,0.1);color:var(--primary);padding:4px 12px;border-radius:4px;font-size:.78rem;font-weight:600;font-family:'Montserrat',sans-serif}
.email{font-size:.85rem;color:var(--text-sec)}
.email i{color:var(--primary);margin-right:6px}
.group-title{font-family:'Montserrat',sans-serif;font-size:1.15rem;font-weight:700;margin:30px 0 16px;padding-bottom:8px;border-bottom:2px solid var(--border);color:var(--text)}
.people-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:18px;margin-bottom:10px}
.person-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;text-align:center;transition:transform .2s,box-shadow .2s}
.person-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.person-card img{width:120px;height:150px;object-fit:cover;border-radius:var(--radius);margin:0 auto 14px}
.person-card h4{font-family:'Montserrat',sans-serif;font-size:.92rem;font-weight:700}
.since{font-size:.75rem;color:var(--text-muted);margin:4px 0}
.interest{font-size:.8rem;color:var(--text-sec);margin-bottom:6px}
.person-card.mini{padding:16px}
.person-card.mini h4{font-size:.85rem}
.alumni-grid .person-card{opacity:.75}
.alumni-grid .person-card:hover{opacity:1}

/* ===== Research Detail ===== */
.research-block{margin-bottom:50px}
.ra-title{font-family:'Montserrat',sans-serif;font-size:1.2rem;font-weight:700;color:var(--primary);margin-bottom:16px;display:flex;align-items:center;gap:10px}
.ra-title i{font-size:1.1rem}
.ra-content{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);padding:28px}
.ra-images{display:flex;gap:12px;margin-bottom:18px;overflow-x:auto}
.ra-images img{height:200px;border-radius:8px;object-fit:cover;flex-shrink:0}
.ra-content ul{list-style:none;padding:0}
.ra-content li{position:relative;padding-left:18px;margin-bottom:8px;font-size:.9rem;color:var(--text-sec)}
.ra-content li::before{content:'';position:absolute;left:0;top:10px;width:6px;height:6px;background:var(--primary);border-radius:50%}

/* ===== Projects ===== */
.project-list{display:flex;flex-direction:column;gap:14px;margin-bottom:20px}
.project-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:22px 26px;transition:box-shadow .2s}
.project-card:hover{box-shadow:var(--shadow)}
.project-card.has-img{display:flex;gap:20px;align-items:flex-start;padding:0;overflow:hidden}
.project-card.has-img .proj-img{flex-shrink:0;width:200px;min-height:140px}
.project-card.has-img .proj-img img{width:100%;height:100%;object-fit:cover}
.project-card.has-img .proj-body{padding:18px 22px 18px 0;flex:1}
.project-card.completed{opacity:.7}
.project-card.completed:hover{opacity:1}
.project-card h4{font-family:'Montserrat',sans-serif;font-size:1rem;font-weight:700;margin:8px 0 4px}
.project-card p{font-size:.85rem;color:var(--text-sec);margin-bottom:8px}
.proj-badge{display:inline-block;font-family:'Montserrat',sans-serif;font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.8px;padding:3px 12px;border-radius:4px}
.proj-badge.ongoing{background:#d4edda;color:#155724}
.proj-badge.done{background:#e2e8f0;color:#64748b}
.proj-meta{display:flex;flex-wrap:wrap;gap:18px;font-size:.8rem;color:var(--text-muted)}
.proj-meta i{color:var(--primary);margin-right:5px}
@media(max-width:768px){
  .project-card.has-img{flex-direction:column}
  .project-card.has-img .proj-img{width:100%;min-height:160px;max-height:200px}
  .project-card.has-img .proj-body{padding:16px}
}

/* ===== Publications ===== */
.pub-tabs{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-bottom:30px}
.pub-tab{background:var(--bg-alt);border:1px solid var(--border);color:var(--text-sec);font-family:'Montserrat',sans-serif;font-size:.8rem;font-weight:600;padding:8px 20px;border-radius:6px;cursor:pointer;transition:all .2s}
.pub-tab:hover{border-color:var(--primary);color:var(--primary)}
.pub-tab.active{background:var(--primary);border-color:var(--primary);color:#fff}
.pub-content{display:none}
.pub-content.active{display:block}
.pub-table{width:100%;max-width:900px;margin:0 auto;border-collapse:collapse}
.pub-table tr{border-bottom:1px solid var(--border)}
.pub-table td{padding:14px 12px;vertical-align:top;font-size:.9rem}
.pub-year{font-family:'Montserrat',sans-serif;font-weight:700;color:var(--primary);width:55px}
.pub-venue{font-size:.8rem;color:var(--text-muted)}
.pub-link{display:inline-block;margin-left:8px;font-size:.75rem;font-weight:600;color:var(--primary);padding:2px 10px;border:1px solid var(--primary);border-radius:4px;transition:all .2s;vertical-align:middle}
.pub-link:hover{background:var(--primary);color:#fff}
.pub-link i{margin-right:3px;font-size:.7rem}

/* ===== Courses ===== */
.courses-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-bottom:20px}
.course-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center;transition:transform .2s,box-shadow .2s}
.course-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.course-card i{font-size:2rem;color:var(--primary);margin-bottom:12px}
.course-card h4{font-family:'Montserrat',sans-serif;font-size:.95rem;font-weight:700;margin-bottom:4px}
.course-card p{font-size:.8rem;color:var(--text-muted)}

/* ===== Awards ===== */
.awards-with-photos{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:24px}
.award-entry{display:flex;gap:24px;align-items:center;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:box-shadow .2s}
.award-entry:hover{box-shadow:var(--shadow)}
.award-info{flex:1;padding:20px 24px}
.award-info h4{font-family:'Montserrat',sans-serif;font-size:1rem;font-weight:700;margin-bottom:6px}
.award-info p{font-size:.85rem;color:var(--text-sec)}
.aw-date-badge{display:inline-block;font-family:'Montserrat',sans-serif;font-size:.75rem;font-weight:700;color:var(--primary);background:rgba(61,133,198,0.1);padding:3px 12px;border-radius:4px;margin-bottom:8px}
.aw-icon{color:#f59e0b;margin-right:6px}
.award-photo{flex-shrink:0;width:260px;height:180px}
.award-photo img{width:100%;height:100%;object-fit:cover}
@media(max-width:768px){
  .award-entry{flex-direction:column-reverse}
  .award-photo{width:100%;height:200px}
}

/* ===== Contact ===== */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px}
.contact-item{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);padding:28px;text-align:center}
.contact-item i{font-size:1.8rem;color:var(--primary);margin-bottom:12px}
.contact-item h4{font-family:'Montserrat',sans-serif;font-size:.95rem;font-weight:700;margin-bottom:8px}
.contact-item p{font-size:.85rem;color:var(--text-sec);line-height:1.7}

/* ===== Footer ===== */
.footer{background:var(--bg-alt);border-top:1px solid var(--border);padding:24px 0}
.footer-inner{display:flex;align-items:center;justify-content:center;gap:12px}
.footer-inner img{height:28px;width:28px;border-radius:6px;object-fit:cover}
.footer-inner p{font-size:.78rem;color:var(--text-muted)}

/* ===== Person Detail ===== */
.clickable{cursor:pointer}
.clickable:hover{border-color:var(--primary)!important;box-shadow:0 4px 20px rgba(61,133,198,0.12)!important}
.back-btn{display:inline-flex;align-items:center;gap:8px;background:none;border:1px solid var(--border);color:var(--primary);font-family:'Montserrat',sans-serif;font-size:.85rem;font-weight:600;padding:10px 20px;border-radius:6px;cursor:pointer;margin-bottom:30px;transition:all .2s}
.back-btn:hover{background:var(--primary);color:#fff}

.pd-header{display:flex;gap:40px;margin-bottom:40px;align-items:flex-start}
.pd-photo{flex-shrink:0}
.pd-photo img{width:200px;height:250px;object-fit:cover;border-radius:var(--radius);box-shadow:var(--shadow)}
.pd-info h2{font-family:'Montserrat',sans-serif;font-size:1.8rem;font-weight:800;margin-bottom:4px}
.pd-info .pd-role{color:var(--primary);font-weight:600;font-size:1rem;margin-bottom:4px}
.pd-info .pd-affil{color:var(--text-sec);font-size:.9rem;margin-bottom:12px}
.pd-info .pd-email{font-size:.88rem;color:var(--text-sec);margin-bottom:16px}
.pd-info .pd-email i{color:var(--primary);margin-right:6px}
.pd-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:16px}
.pd-tags span{background:rgba(61,133,198,0.1);color:var(--primary);padding:5px 14px;border-radius:4px;font-size:.8rem;font-weight:600;font-family:'Montserrat',sans-serif}

.pd-links{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}
.pd-links a{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;background:var(--bg-alt);border:1px solid var(--border);border-radius:6px;font-size:.85rem;font-weight:600;color:var(--text);transition:all .2s}
.pd-links a:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.pd-links a i{font-size:1rem}

.pd-section{margin-bottom:30px}
.pd-section h3{font-family:'Montserrat',sans-serif;font-size:1.1rem;font-weight:700;color:var(--primary);margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid var(--border)}
.pd-section h3 i{margin-right:8px}
.pd-section h4{font-family:'Montserrat',sans-serif;font-size:.95rem;font-weight:700;color:var(--text);margin:18px 0 8px;padding-left:4px}
.pd-section ul{list-style:none;padding:0}
.pd-section li{position:relative;padding-left:18px;margin-bottom:8px;font-size:.9rem;color:var(--text-sec)}
.pd-section li::before{content:'';position:absolute;left:0;top:10px;width:6px;height:6px;background:var(--primary);border-radius:50%}
.pd-section li strong{color:var(--text)}
.pd-section p{font-size:.9rem;color:var(--text-sec);line-height:1.7}

.pd-pub-item{padding:12px 0;border-bottom:1px solid var(--border)}
.pd-pub-item strong{color:var(--text);font-size:.9rem}
.pd-pub-item .pub-venue{font-size:.8rem;color:var(--text-muted)}

@media(max-width:768px){
  .pd-header{flex-direction:column;align-items:center;text-align:center}
  .pd-tags{justify-content:center}
  .pd-links{justify-content:center}
}

/* ===== Gallery ===== */
.gallery-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin-bottom:30px}
.gallery-item{position:relative;overflow:hidden;border-radius:var(--radius);cursor:pointer;aspect-ratio:4/3}
.gallery-item img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.gallery-item:hover img{transform:scale(1.05)}
.gallery-caption{position:absolute;bottom:0;left:0;right:0;padding:8px 12px;background:linear-gradient(transparent,rgba(0,0,0,0.7));color:#fff;font-size:.75rem;font-weight:500;opacity:0;transition:opacity .3s}
.gallery-item:hover .gallery-caption{opacity:1}

/* Lightbox */
.lightbox{position:fixed;inset:0;z-index:9999;background:rgba(0,0,0,0.92);display:flex;align-items:center;justify-content:center}
.lb-img{max-width:90vw;max-height:85vh;border-radius:8px;object-fit:contain}
.lb-close,.lb-prev,.lb-next{position:absolute;background:none;border:none;color:#fff;font-size:2.5rem;cursor:pointer;padding:10px;opacity:.7;transition:opacity .2s}
.lb-close:hover,.lb-prev:hover,.lb-next:hover{opacity:1}
.lb-close{top:20px;right:30px}
.lb-prev{left:20px;top:50%;transform:translateY(-50%)}
.lb-next{right:20px;top:50%;transform:translateY(-50%)}

/* ===== Animations ===== */
.fade-in{opacity:0;transform:translateY(20px);transition:opacity .5s ease,transform .5s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* ===== Responsive ===== */
@media(max-width:768px){
  .nav-toggle{display:block}
  .nav-menu{display:none;position:absolute;top:var(--nav-h);left:0;width:100%;background:rgba(255,255,255,.98);backdrop-filter:blur(12px);flex-direction:column;padding:12px 24px;border-bottom:1px solid var(--border)}
  .nav-menu.open{display:flex}
  .hero-title{font-size:2.2rem}
  .about-grid{grid-template-columns:1fr;gap:30px}
  .about-stats{justify-content:center}
  .director-card{flex-direction:column;text-align:center}
  .director-photo img{margin:0 auto}
  .interest-tags{justify-content:center}
  .rp-grid{grid-template-columns:1fr 1fr}
  .highlights-grid{grid-template-columns:1fr}
  .people-grid{grid-template-columns:1fr 1fr}
  .news-row{flex-wrap:wrap}
  .ra-images{flex-wrap:nowrap}
  .ra-images img{height:150px}
  .pub-tab{font-size:.72rem;padding:6px 12px}
}
@media(max-width:480px){
  .hero-title{font-size:1.8rem}
  .hero-section{min-height:350px}
  .rp-grid{grid-template-columns:1fr}
  .people-grid{grid-template-columns:1fr}
  .container{padding:0 16px}
}