/* FPFT Lab 2026 redesign
   CNU official UI colors: primary green #007a33, secondary blue #003594.
   Layout is intentionally simple: research, people, outputs, activities, contact. */
:root{
  --cnu-green:#007a33;
  --cnu-green-dark:#005f28;
  --cnu-blue:#003594;
  --ink:#171a18;
  --muted:#68716b;
  --line:#dfe6e1;
  --soft:#f4f7f5;
  --white:#fff;
  --max:1180px;
  --radius:8px;
  --shadow:0 18px 55px rgba(13,37,25,.09);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--white);color:var(--ink);font-family:Inter,"Pretendard","Noto Sans KR",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65;word-break:keep-all}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button,input,select{font:inherit}
.wrap{width:min(var(--max),calc(100% - 48px));margin:0 auto}
.skip{position:absolute;left:-9999px;top:0;background:#fff;padding:10px 14px;z-index:999}
.skip:focus{left:12px;top:12px}

/* Header */
.site-header,.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.97);border-top:4px solid var(--cnu-green);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}
.site-header-inner,.header-inner{min-height:82px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.site-brand,.brand{display:flex;align-items:center;gap:12px;min-width:280px}
.site-brand-logo{width:48px;height:48px;border-radius:50%;object-fit:contain;background:#fff;flex:none}
.site-brand-fallback{display:none;width:44px;height:44px;border-radius:50%;background:var(--cnu-green);color:#fff;place-items:center;font-weight:800;font-size:12px;flex:none}
.site-brand-text strong,.brand strong{display:block;font-size:16px;line-height:1.15;font-weight:750;letter-spacing:-.025em}
.site-brand-text small,.brand small{display:block;margin-top:4px;font-size:10px;line-height:1.2;color:var(--muted);letter-spacing:.04em}
.site-brand-text em{display:block;margin-top:2px;font-size:11px;font-style:normal;color:var(--cnu-green);font-weight:650}
.brand-mark{display:none!important}
.nav{display:flex;align-items:center;gap:30px;font-size:14px;font-weight:650}
.nav>a,.nav-group>button{border:0;background:none;padding:28px 0;color:#262b28;cursor:pointer;font-weight:650}
.nav>a:hover,.nav>a[aria-current="page"],.nav-group>button:hover{color:var(--cnu-green)}
.nav-group{position:relative}
.nav-group>button::after{content:"⌄";font-size:11px;margin-left:5px;color:var(--muted)}
.nav-sub{position:absolute;left:-18px;top:66px;min-width:190px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);padding:10px;border-radius:6px;opacity:0;visibility:hidden;transform:translateY(-5px);transition:.16s ease}
.nav-group:hover .nav-sub,.nav-group:focus-within .nav-sub{opacity:1;visibility:visible;transform:none}
.nav-sub a{display:block;padding:9px 10px;border-radius:4px;color:#3d4540;font-size:13px;white-space:nowrap}
.nav-sub a:hover{background:var(--soft);color:var(--cnu-green)}
.menu-button{display:none;border:1px solid var(--line);background:#fff;padding:9px 12px;border-radius:5px;font-weight:700}

/* Shared */
.eyebrow{margin:0 0 10px;color:var(--cnu-green);font-size:11px;font-weight:800;letter-spacing:.14em;text-transform:uppercase}
.section{padding:88px 0}
.section.soft{background:var(--soft)}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:34px}
.section-head h2{font-size:clamp(28px,3.3vw,42px);line-height:1.2;letter-spacing:-.045em;margin:0;font-weight:700}
.section-head p{margin:8px 0 0;color:var(--muted);font-size:14px}
.more-link{font-size:13px;font-weight:750;color:var(--cnu-green);white-space:nowrap}
.page-hero{padding:78px 0 58px;border-bottom:1px solid var(--line)}
.page-hero h1{margin:0;font-size:clamp(42px,6vw,72px);line-height:1.05;letter-spacing:-.055em;font-weight:720}
.page-hero p:last-child{max-width:680px;margin:18px 0 0;color:var(--muted);font-size:15px}
.button{display:inline-flex;align-items:center;gap:8px;background:var(--cnu-green);color:#fff;padding:12px 18px;border-radius:5px;font-size:13px;font-weight:750}
.button:hover{background:var(--cnu-green-dark)}
.badge{display:inline-flex;padding:5px 9px;border-radius:999px;background:#e8f3ed;color:var(--cnu-green);font-size:10px;font-weight:800;letter-spacing:.04em}

/* Home */
.home-hero{position:relative;min-height:560px;display:grid;align-items:end;overflow:hidden;background:#0d2419}
.home-hero>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 42%;opacity:.73}
.home-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(5,26,16,.8) 0%,rgba(5,26,16,.48) 48%,rgba(5,26,16,.12) 100%),linear-gradient(0deg,rgba(0,0,0,.45),transparent 58%)}
.home-hero-content{position:relative;z-index:2;color:#fff;padding:0 0 72px;max-width:760px}
.home-hero .eyebrow{color:#bfe1cd}
.home-hero h1{font-size:clamp(44px,6.6vw,82px);line-height:.98;letter-spacing:-.058em;font-weight:720;margin:0}
.home-hero p.lead{font-size:17px;margin:22px 0 0;color:rgba(255,255,255,.86)}
.home-hero .home-keywords{margin-top:18px;font-size:13px;font-weight:700;letter-spacing:.03em;color:#fff}
.research-preview-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.research-preview{position:relative;border:1px solid var(--line);border-radius:var(--radius);padding:34px;background:#fff;min-height:240px;overflow:hidden}
.research-preview::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--cnu-green)}
.research-preview.theme-2::before{background:var(--cnu-blue)}
.research-preview .num{font-size:12px;font-weight:800;color:var(--cnu-green);letter-spacing:.12em}
.research-preview.theme-2 .num{color:var(--cnu-blue)}
.research-preview h3{font-size:25px;line-height:1.3;letter-spacing:-.035em;margin:22px 0 8px;font-weight:680}
.research-preview .eng{font-size:12px;color:var(--muted);margin:0 0 18px}
.research-preview .tags{font-size:12px;color:#4d5650;margin:0}
.latest-pubs{border-top:1px solid var(--line)}
.pub-row{display:grid;grid-template-columns:80px 1fr 170px;gap:24px;padding:23px 0;border-bottom:1px solid var(--line);align-items:start}
.pub-year{color:var(--cnu-green);font-weight:800;font-size:13px}
.pub-title{font-size:16px;line-height:1.45;font-weight:650;margin:0 0 6px}
.pub-authors{font-size:12px;color:var(--muted);margin:0}
.pub-journal{text-align:right;font-size:12px;color:var(--muted)}

/* Research */
.research-flowbar{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:6px;overflow:hidden;margin:34px 0 0}
.research-flowbar span{position:relative;padding:15px 18px;background:#fff;font-size:12px;font-weight:750;border-right:1px solid var(--line)}
.research-flowbar span:last-child{border-right:0}
.research-flowbar span:not(:last-child)::after{content:"→";position:absolute;right:-9px;background:#fff;color:var(--cnu-green);padding:0 2px;z-index:2}
.research-block{padding:76px 0;border-bottom:1px solid var(--line)}
.research-block:last-child{border-bottom:0}
.research-block-grid{display:grid;grid-template-columns:180px 1fr;gap:50px}
.research-number{font-size:64px;line-height:1;color:#cfd9d3;font-weight:800;letter-spacing:-.05em}
.research-block.theme-2 .research-number{color:#ced7eb}
.research-block h2{font-size:clamp(30px,4vw,48px);line-height:1.15;letter-spacing:-.045em;margin:0 0 6px}
.research-block .eng-title{font-size:13px;color:var(--muted);margin:0 0 23px}
.research-summary{max-width:780px;font-size:16px;margin:0;color:#323834}
.flow-line{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:30px 0}
.flow-line span{background:var(--soft);border:1px solid var(--line);padding:8px 12px;border-radius:5px;font-size:12px;font-weight:700}
.flow-line i{font-style:normal;color:var(--cnu-green)}
.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:34px}
.topic-card{border-top:2px solid var(--cnu-green);padding:16px 2px 0}
.theme-2 .topic-card{border-color:var(--cnu-blue)}
.topic-card h3{font-size:17px;margin:0 0 6px}
.topic-card p{font-size:12px;color:var(--muted);margin:0}

/* Members */
.pi-card,.professor{display:grid;grid-template-columns:280px 1fr;gap:48px;align-items:start;padding:54px 0 70px;border-bottom:1px solid var(--line)}
.pi-card img,.professor>img{width:280px;height:340px;object-fit:cover;border-radius:6px;background:var(--soft)}
.pi-card h2,.professor h2{font-size:38px;line-height:1.2;margin:4px 0 6px;letter-spacing:-.04em}
.professor h2 span,.pi-card h2 span{display:block;font-size:16px;color:var(--muted);font-weight:500;margin-top:5px}
.prof-role{font-size:13px;color:var(--cnu-green);font-weight:750}
.profile-links{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:20px;font-size:12px;color:var(--muted)}
.profile-details{display:grid;grid-template-columns:1fr 1fr;gap:40px;padding:48px 0}
.profile-details h2{font-size:18px;margin:0 0 12px}
.profile-details ul{margin:0;padding-left:18px;color:var(--muted);font-size:13px}
.student-section{padding:62px 0}
.student-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.student-row{display:grid;grid-template-columns:92px 1fr;gap:20px;align-items:center;border:1px solid var(--line);padding:14px;border-radius:6px;background:#fff}
.student-portrait{width:92px;height:110px;object-fit:cover;border-radius:4px;background:var(--soft)}
.student-info .eyebrow{margin-bottom:4px}
.student-info h3{font-size:18px;margin:0 0 4px;letter-spacing:-.02em}
.student-info h3 span{display:block;font-size:12px;font-weight:500;color:var(--muted);margin-top:2px}
.student-info a{font-size:12px;color:var(--muted)}
.member-group-title{font-size:23px;margin:48px 0 18px}

/* Outputs */
.output-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-top:26px}
.output-tabs a{border:1px solid var(--line);padding:8px 12px;border-radius:999px;font-size:12px;font-weight:750}
.output-tabs a:hover{border-color:var(--cnu-green);color:var(--cnu-green)}
.publication-tools{display:flex;gap:12px;align-items:center;margin-bottom:18px}
.publication-tools select,.publication-tools input{border:1px solid var(--line);background:#fff;border-radius:5px;padding:9px 11px;font-size:12px}
.publication-tools input{min-width:260px}
.project-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.project-card{border:1px solid var(--line);border-radius:6px;padding:24px;background:#fff}
.project-card h3{font-size:17px;line-height:1.45;margin:10px 0 10px}
.project-card p{font-size:12px;color:var(--muted);margin:0}
.empty-note{border-top:1px solid var(--line);padding:18px 0;color:var(--muted);font-size:13px}

/* Activities */
.activity-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.activity-card{border:1px solid var(--line);border-radius:7px;overflow:hidden;background:#fff}
.activity-card img{width:100%;aspect-ratio:16/10;object-fit:cover}
.activity-card figcaption{padding:18px 20px 21px}
.activity-card time{font-size:11px;color:var(--cnu-green);font-weight:800}
.activity-card h2{font-size:18px;margin:5px 0 4px}
.activity-card p{font-size:12px;color:var(--muted);margin:0}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;padding:58px 0}
.contact-card{border:1px solid var(--line);border-radius:7px;padding:30px}
.contact-card h2{font-size:26px;margin:0 0 14px}
.contact-card p,.contact-card dd,.contact-card dt{font-size:13px}
.contact-card dl{display:grid;grid-template-columns:80px 1fr;gap:8px 14px;margin:20px 0 0}
.contact-card dt{font-weight:800;color:var(--cnu-green)}
.contact-card dd{margin:0;color:var(--muted)}
.map-frame{border:1px solid var(--line);border-radius:7px;overflow:hidden;height:430px}
.map-frame iframe{width:100%;height:100%;border:0}

/* Footer */
.site-footer,.footer{background:#101713;color:#d8dfda;margin-top:70px}
.footer-inner{padding:40px 0;display:flex;justify-content:space-between;gap:24px;font-size:12px}
.footer-inner strong{color:#fff}
.footer-inner p{margin:4px 0;color:#aeb9b2}
.footer-inner a{color:#d8dfda}
.footer-cnu{color:#93c5aa;font-weight:700}

.loading{padding:28px 0;color:var(--muted);font-size:13px}
.data-error{padding:18px;border:1px solid #e8c5c5;background:#fff7f7;border-radius:6px;color:#7b3636;font-size:13px}

@media(max-width:900px){
  .nav{gap:18px}.site-brand,.brand{min-width:220px}.research-block-grid{grid-template-columns:110px 1fr}.topic-grid,.project-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .wrap{width:min(100% - 32px,var(--max))}
  .site-header-inner,.header-inner{min-height:70px}.site-brand-logo{width:40px;height:40px}.site-brand,.brand{min-width:0}.site-brand-text small,.brand small{display:none}
  .menu-button{display:block}.nav{display:none;position:absolute;left:0;right:0;top:70px;background:#fff;border-bottom:1px solid var(--line);padding:12px 16px 18px;flex-direction:column;align-items:stretch;gap:0}.nav.open{display:flex}.nav>a,.nav-group>button{display:block;width:100%;text-align:left;padding:11px 4px}.nav-sub{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;padding:0 0 6px 14px;display:none}.nav-group.open .nav-sub{display:block}
  .home-hero{min-height:500px}.home-hero-content{padding-bottom:48px}.home-hero h1{font-size:48px}.section{padding:62px 0}
  .research-preview-grid,.student-list,.activity-grid,.contact-grid,.profile-details{grid-template-columns:1fr}
  .pub-row{grid-template-columns:58px 1fr}.pub-journal{grid-column:2;text-align:left}
  .research-block-grid{grid-template-columns:1fr;gap:18px}.research-number{font-size:38px}.topic-grid,.project-grid{grid-template-columns:1fr}.research-flowbar{grid-template-columns:1fr}.research-flowbar span{border-right:0;border-bottom:1px solid var(--line)}.research-flowbar span:last-child{border-bottom:0}
  .pi-card,.professor{grid-template-columns:1fr;gap:24px}.pi-card img,.professor>img{width:220px;height:270px}.publication-tools{align-items:stretch;flex-direction:column}.publication-tools input{min-width:0;width:100%}
  .footer-inner{flex-direction:column}.section-head{align-items:start;flex-direction:column}.contact-grid{padding-top:34px}
}