:root{--blue:#0e4a84;--blue-d:#08305a;--ink:#16202b;--mute:#5b6875;--line:#e2e7ec;--bg:#fff;--soft:#f4f7fa;--accent:#e8862e}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Pretendard Variable",Pretendard,-apple-system,"Apple SD Gothic Neo","Noto Sans KR",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;word-break:keep-all}
html[data-lang=ko] .en,html[data-lang=en] .ko{display:none!important}
a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}
img{max-width:100%;display:block}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:99}
/* header */
header.site{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;gap:20px;min-height:64px;flex-wrap:wrap}
.brand{font-weight:800;font-size:1.25rem;color:var(--blue-d);letter-spacing:-.01em}
.brand small{font-weight:500;color:var(--mute);font-size:.72rem;margin-left:8px;letter-spacing:.04em}
.brand:hover{text-decoration:none}
nav.main{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
nav.main a{padding:8px 10px;border-radius:6px;color:var(--ink);font-size:.95rem;font-weight:500}
nav.main a:hover{background:var(--soft);text-decoration:none}
nav.main a.on{color:var(--blue);font-weight:700}
.lang{display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden}
.lang button{border:0;background:none;padding:5px 11px;font:inherit;font-size:.8rem;font-weight:600;color:var(--mute);cursor:pointer}
.lang button.on{background:var(--blue);color:#fff}
.menu-btn{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:6px;padding:6px 10px;font-size:1.1rem;cursor:pointer}
/* hero */
.hero{background:linear-gradient(180deg,#fff,#f4f7fa);color:var(--ink);padding:64px 0 56px;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:32px;align-items:center}
.hero-art{width:100%;height:auto;mix-blend-mode:multiply;border-radius:16px}
.hero .eyebrow{font-size:.85rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:700;margin:0 0 14px}
.hero h1{font-size:clamp(1.8rem,4vw,2.8rem);line-height:1.25;margin:0 0 28px;letter-spacing:-.02em;color:var(--blue-d)}
.hero .aff{margin-top:32px;font-size:.95rem;color:var(--mute)}
.hero .aff b{color:var(--ink)}
.btn{display:inline-block;padding:11px 20px;border-radius:8px;font-weight:600;margin:0 8px 8px 0;border:1.5px solid #fff;color:#fff}
.btn.fill{background:#fff;color:var(--blue-d)}
.btn:hover{text-decoration:none;opacity:.9}
.btn.dark{border-color:var(--blue);color:var(--blue)}.btn.dark.fill{background:var(--blue);color:#fff}
/* sections */
.page-head{background:var(--soft);border-bottom:1px solid var(--line);padding:48px 0 36px}
.page-head h1{margin:0;font-size:2rem;letter-spacing:-.02em}
.page-head p{margin:8px 0 0;color:var(--mute)}
section.block{padding:56px 0}
.sec-label{font-size:.78rem;letter-spacing:.14em;color:var(--accent);font-weight:700;margin:0}
.sec-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:24px}
.sec-head h2{margin:2px 0 0;font-size:1.6rem;letter-spacing:-.02em}
h2{letter-spacing:-.02em}
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{border:1px solid var(--line);border-radius:12px;padding:22px;background:#fff}
.card .num{font-size:.8rem;font-weight:700;color:var(--accent)}
.card h3{margin:6px 0 8px;font-size:1.08rem;line-height:1.4}
.card p{margin:0;color:var(--mute);font-size:.94rem}
/* slider */
.slider{position:relative;margin-top:-40px}
.slider .frame{border-radius:14px;overflow:hidden;background:#fff;box-shadow:0 10px 30px rgba(8,48,90,.18);aspect-ratio:16/8}
.slider img{width:100%;height:100%;object-fit:cover;display:none}
.slider img.on{display:block}
.slider button{position:absolute;top:50%;transform:translateY(-50%);border:0;background:rgba(255,255,255,.9);width:38px;height:38px;border-radius:50%;font-size:1.3rem;cursor:pointer}
.slider .prev{left:10px}.slider .next{right:10px}
/* research detail */
.area{display:grid;grid-template-columns:72px 1fr;gap:20px;padding:30px 0;border-bottom:1px solid var(--line)}
.area .n{font-size:2rem;font-weight:800;color:var(--blue);opacity:.35;line-height:1}
.area h2{margin:0 0 4px;font-size:1.3rem}
.area .sub{color:var(--mute);font-size:.9rem;margin:0 0 10px}
.area ul{margin:10px 0 0;padding-left:18px;color:var(--mute)}
/* news */
.news{list-style:none;margin:0;padding:0}
.news li{padding:22px 0;border-bottom:1px solid var(--line)}
.news .meta{font-size:.85rem;color:var(--mute);display:flex;gap:10px;align-items:center}
.tag{font-size:.75rem;font-weight:700;padding:2px 9px;border-radius:999px;background:#e6eef6;color:var(--blue)}
.tag.award{background:#fdefe0;color:#b3600f}.tag.paper{background:#e4f3ea;color:#1c7a45}.tag.talk{background:#efe8f8;color:#6a3fa8}
.news h3{margin:6px 0 4px;font-size:1.1rem}
.news p{margin:0;color:#3a4652;white-space:pre-line}
.news p.more{margin-top:8px;font-weight:600}
.tag.notice{background:var(--blue);color:#fff}
.news .pics{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:8px;margin-top:12px}
.news .pics img{border-radius:8px;aspect-ratio:4/3;object-fit:cover;width:100%}
/* people */
.people{display:grid;gap:22px;grid-template-columns:repeat(auto-fill,minmax(190px,1fr))}
.person{text-align:center}
.person .ph{width:120px;height:120px;border-radius:50%;margin:0 auto 12px;background:var(--soft);border:1px solid var(--line);display:grid;place-items:center;font-size:2rem;font-weight:700;color:var(--blue);overflow:hidden}
.person .ph img{width:100%;height:100%;object-fit:cover}
.person b{display:block}.person span{color:var(--mute);font-size:.88rem;display:block}
.pi{display:grid;grid-template-columns:240px 1fr;gap:36px;align-items:start}
.pi .photo{aspect-ratio:3/4;border-radius:12px;background:var(--soft);border:1px solid var(--line);display:grid;place-items:center;color:var(--mute);overflow:hidden}
.cv{list-style:none;padding:0;margin:0}
.cv li{display:grid;grid-template-columns:150px 1fr;gap:12px;padding:8px 0;border-bottom:1px dashed var(--line)}
.cv li span:first-child{color:var(--mute);font-size:.9rem}
/* pubs */
.year{font-size:1.4rem;margin:36px 0 4px;color:var(--blue);padding-bottom:8px;border-bottom:2px solid var(--blue)}
ul.pubs{list-style:none;margin:0;padding:0}
ul.pubs li{padding:20px 0;border-bottom:1px solid var(--line)}
ul.pubs .role{display:inline-block;font-size:.72rem;font-weight:700;color:#b3600f;background:#fdefe0;padding:1px 8px;border-radius:999px;margin-bottom:4px}
ul.pubs h3{margin:0 0 4px;font-size:1.02rem;line-height:1.45;font-weight:600}
ul.pubs h3 a{color:var(--ink)}
ul.pubs p{margin:0;font-size:.9rem}
ul.pubs .j{color:var(--blue-d)}
ul.pubs .a{color:var(--mute);margin-top:2px}
ul.pubs .a b{color:var(--ink)}
ul.pubs .d{margin-top:4px;font-weight:600}
footer.site{background:var(--blue-d);color:#cfdbe8;padding:36px 0;margin-top:40px;font-size:.92rem}
footer.site a{color:#fff}footer.site b{color:#fff}
footer.site .c{margin-top:14px;opacity:.6;font-size:.82rem}
@media(max-width:820px){
 .menu-btn{display:block}
 nav.main{display:none;width:100%;flex-direction:column;margin:0;padding-bottom:10px}
 nav.main.open{display:flex}
 .hero{padding:40px 0}.hero-grid{grid-template-columns:1fr;gap:12px}.hero-art{max-width:420px;margin:0 auto}
 .pi{grid-template-columns:1fr}.pi .photo{max-width:220px}
 .area{grid-template-columns:1fr;gap:6px}
 .cv li{grid-template-columns:1fr;gap:0}
}
.callout{border:1px solid var(--line);border-top:4px solid var(--accent);border-radius:12px;padding:24px;margin-bottom:36px;background:#fff}
.callout h2{margin:8px 0 14px;font-size:1.3rem}
.callout .cv{margin-bottom:18px}
.area .body{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:32px;align-items:start}
.fig{margin:0}
.fig a{display:block}
.fig img{width:100%;height:auto;border:1px solid var(--line);border-radius:10px;background:#fff}
.fig figcaption{margin-top:6px;font-size:.78rem;color:var(--mute);line-height:1.45}
.philo{padding-bottom:8px}
.philo h2{margin:2px 0 14px;font-size:1.6rem}
.philo p:not(.sec-label){max-width:780px;margin:0;font-size:1.02rem;line-height:1.9;color:#2a3540}
.philo+.block{padding-top:24px}
@media(max-width:820px){.area .body{grid-template-columns:1fr;gap:16px}.fig{max-width:420px}}
/* steps (infographic) */
.steps{list-style:none;margin:28px 0 0;padding:0;display:grid;grid-auto-flow:column;grid-auto-columns:minmax(0,1fr);counter-reset:s}
.steps li{position:relative;padding:22px 14px 0 0}
.steps li::before{content:"";position:absolute;top:5px;left:0;right:0;height:2px;background:#c9d6e3}
.steps li:last-child::before{right:auto;width:12px}
.steps li::after{content:"";position:absolute;top:0;left:0;width:12px;height:12px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 3px #fff}
.steps li:last-child::after{background:var(--accent)}
.steps .k{display:block;font-size:.74rem;font-weight:700;letter-spacing:.06em;color:var(--accent)}
.steps b{display:block;font-size:1rem;line-height:1.35;margin:2px 0}
.steps .s{display:block;font-size:.84rem;color:var(--mute);line-height:1.45}
.steps+.note{margin-top:28px}
/* collaborators */
.pub-count{color:var(--mute);margin:0 0 4px;font-size:.92rem}
.collab{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;margin:0}
.collab .card h3{margin:0 0 2px;font-size:1.2rem;color:var(--blue-d)}
.collab .card .c{font-size:.8rem;font-weight:700;letter-spacing:.06em;color:var(--accent);margin:0 0 10px}
.collab .card .p{font-weight:600;color:var(--ink);margin:0 0 4px;font-size:.95rem}
@media(max-width:820px){
 .steps{grid-auto-flow:row}
 .steps li{padding:0 0 18px 26px}
 .steps li::before{top:6px;bottom:-6px;left:5px;right:auto;width:2px;height:auto}
 .steps li:last-child::before{display:none}
 .steps li::after{top:5px}
}