:root{
  --paper:#F4F6F5; --ink:#1C2B33; --ink-soft:#4A5C66; --line:#D4DCDA;
  --panel:#16324F; --panel-ink:#EAF1F4; --accent:#0F7B7E; --accent-soft:#E0EDED;
  --copper:#B0703C; --card:#FFFFFF;
}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:'IBM Plex Sans KR','Noto Sans KR',sans-serif;line-height:1.65;font-size:16px;word-break:keep-all;overflow-wrap:break-word}
.serif{font-family:'IBM Plex Serif',serif}
.mono{font-family:'IBM Plex Mono',monospace}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1060px;margin:0 auto;padding:0 28px}
img{max-width:100%}

/* language */
[data-lang="ko"] .lang-en{display:none}
[data-lang="en"] .lang-ko{display:none}

/* nav */
nav{border-bottom:1px solid var(--line);background:var(--paper);position:sticky;top:0;z-index:10}
.nav-in{display:flex;align-items:center;gap:28px;height:64px}
.logo{font-family:'IBM Plex Serif',serif;font-weight:600;font-size:19px;letter-spacing:.2px;color:var(--ink)}
.logo b{color:var(--accent)}
.logo:hover{text-decoration:none}
.menu{display:flex;gap:22px;margin-left:auto;font-size:14.5px}
.menu a{color:var(--ink-soft)}
.menu a:hover{color:var(--accent);text-decoration:none}
.menu a.active{color:var(--accent);font-weight:500}
.lang-btn{border:1px solid var(--line);background:transparent;border-radius:2px;padding:5px 12px;font-family:'IBM Plex Mono',monospace;font-size:12.5px;cursor:pointer;color:var(--ink)}
.lang-btn:hover{border-color:var(--accent);color:var(--accent)}
.menu-btn{display:none;border:1px solid var(--line);background:transparent;border-radius:2px;padding:5px 10px;font-size:14px;cursor:pointer;color:var(--ink)}

/* hero (home) */
.hero{padding:84px 0 66px;position:relative;overflow:hidden}
.eyebrow{font-family:'IBM Plex Mono',monospace;font-size:12.5px;letter-spacing:2.5px;color:var(--accent);text-transform:uppercase;margin-bottom:18px}
h1{font-family:'IBM Plex Serif',serif;font-weight:600;font-size:clamp(34px,5vw,52px);line-height:1.18;text-wrap:balance;max-width:17em}
.hero p.sub{margin-top:22px;font-size:18px;color:var(--ink-soft);max-width:34em}
.kw{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
.kw span{font-family:'IBM Plex Mono',monospace;font-size:12.5px;border:1px solid var(--line);padding:6px 12px;border-radius:2px;color:var(--ink-soft);background:var(--card)}
.curve{position:absolute;right:-40px;bottom:-8px;width:460px;max-width:50vw;opacity:.9}

/* page header (subpages) */
.page-head{padding:58px 0 46px;border-bottom:1px solid var(--line)}
.page-head h1{font-size:clamp(30px,4vw,42px)}
.page-head p{margin-top:14px;color:var(--ink-soft);max-width:40em}

/* sections */
section{padding:64px 0;border-top:1px solid var(--line)}
section.first{border-top:none}
.sec-head{display:flex;align-items:baseline;gap:18px;margin-bottom:34px}
h2{font-family:'IBM Plex Serif',serif;font-weight:600;font-size:27px}
h3{font-family:'IBM Plex Serif',serif;font-weight:600}
.sec-head .mono{font-size:12px;color:var(--accent);letter-spacing:2px}

/* research */
.res-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.res{border-top:2px solid var(--ink);padding-top:18px}
.res .no{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--copper)}
.res h3{font-size:19px;margin:8px 0 10px;line-height:1.35}
.res p{font-size:14.5px;color:var(--ink-soft)}
.res a{font-size:13.5px;display:inline-block;margin-top:12px}

/* research detail blocks */
.theme{display:grid;grid-template-columns:220px 1fr;gap:40px;padding:46px 0;border-bottom:1px solid var(--line)}
.theme:last-child{border-bottom:none}
.theme .side .no{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--copper)}
.theme .side h3{font-size:21px;margin-top:8px;line-height:1.35}
.theme .body p{color:var(--ink-soft);font-size:15.5px}
.theme .body p + p{margin-top:12px}
.theme .tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.theme .tags span{font-family:'IBM Plex Mono',monospace;font-size:12px;background:var(--accent-soft);color:var(--accent);padding:5px 10px;border-radius:2px}

/* panel */
.panel{background:var(--panel);color:var(--panel-ink)}
.panel h2{color:#fff}
.panel .sec-head .mono{color:#7FC5C7}
.two-col{display:grid;grid-template-columns:1fr 1.3fr;gap:56px}

/* news list */
.news{padding:0}
.news li{list-style:none;display:flex;gap:16px;padding:13px 0;border-bottom:1px solid rgba(255,255,255,.14);font-size:14.5px}
.news .d{font-family:'IBM Plex Mono',monospace;color:#7FC5C7;font-size:12.5px;white-space:nowrap;padding-top:2px}
.news-page .news li{border-bottom:1px solid var(--line);font-size:15.5px;padding:18px 0}
.news-page .news .d{color:var(--accent)}

/* publications */
.pub{padding:13px 0;border-bottom:1px solid rgba(255,255,255,.14)}
.pub .j{font-family:'IBM Plex Mono',monospace;font-size:12px;color:#7FC5C7}
.pub p{font-size:14.5px;margin-top:3px}
.pub-year{font-family:'IBM Plex Serif',serif;font-size:23px;font-weight:600;margin:44px 0 8px;color:var(--ink)}
.pub-year:first-child{margin-top:0}
.pub-item{padding:18px 0;border-bottom:1px solid var(--line)}
.pub-item .t{font-size:16px;font-weight:500;line-height:1.5}
.pub-item .a{font-size:13.5px;color:var(--ink-soft);margin-top:5px}
.pub-item .a b{color:var(--accent);font-weight:600}
.pub-item .v{font-family:'IBM Plex Mono',monospace;font-size:12.5px;color:var(--copper);margin-top:5px}
/* IF / JCR badges: stronger tier = bolder + deeper color */
.pub-item .v .tag{display:inline-block;margin-left:8px;padding:1px 8px;border-radius:2px;font-size:11.5px;letter-spacing:.2px;border:1px solid var(--line);color:var(--ink-soft);background:var(--card);vertical-align:1px}
.pub-item .v .if10{font-weight:600;color:var(--accent);border-color:#9CCACB;background:var(--accent-soft)}
.pub-item .v .if20{font-weight:700;color:#fff;background:var(--accent);border-color:var(--accent)}
.pub-item .v .jcr10{font-weight:500;color:#8A5A2E;border-color:#E4CDB8;background:#FBF3EA}
.pub-item .v .jcr5{font-weight:600;color:#A34F1E;border-color:#E9B892;background:#FCE6D2}
.pub-item .v .jcr3{font-weight:700;color:#fff;background:#C25A1E;border-color:#C25A1E}
.pub-item .v .jcr1{font-weight:700;color:#fff;background:#8E1B1B;border-color:#8E1B1B;letter-spacing:.4px}
.pub-note{font-size:13px;color:var(--ink-soft);margin-top:26px}

/* professor */
.prof{display:grid;grid-template-columns:190px 1fr;gap:44px;align-items:start}
.prof .edu-h{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:2px;color:var(--accent);margin-top:22px}
.prof .edu{margin-top:6px;padding:0}
.prof .edu li{list-style:none;font-size:14px;color:var(--ink-soft);padding:3px 0}
.prof .photo{width:100%;border-radius:2px;border:1px solid var(--line)}
.prof .name{font-family:'IBM Plex Serif',serif;font-size:27px;font-weight:600}
.prof .role{color:var(--ink-soft);margin-top:6px;font-size:15px}
.prof .links{display:flex;gap:14px;margin-top:16px;font-size:14px;flex-wrap:wrap}
.timeline{margin-top:0}
.timeline li{list-style:none;display:grid;grid-template-columns:150px 1fr;gap:20px;padding:14px 0;border-bottom:1px solid var(--line);font-size:15px}
.timeline .d{font-family:'IBM Plex Mono',monospace;font-size:13px;color:var(--accent);padding-top:2px}
.timeline .org{font-weight:500}
.timeline .desc{color:var(--ink-soft);font-size:14px;margin-top:2px}

/* members */
.mem-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.mem{background:var(--card);border:1px solid var(--line);border-radius:2px;padding:26px}
.mem .nm{font-weight:700;font-size:17px}
.mem .rl{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--accent);margin-top:4px}
.mem p{font-size:14px;color:var(--ink-soft);margin-top:10px}
.mem-photo{width:112px;height:140px;object-fit:cover;object-position:top center;border:1px solid var(--line);border-radius:2px;display:block;margin-bottom:16px}
.mem-mail{font-family:'IBM Plex Mono',monospace;font-size:12.5px;word-break:break-all}
.mem.open{border-style:dashed;background:transparent;display:flex;flex-direction:column;justify-content:center;text-align:center}

/* contact */
.con-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.con-card{background:var(--card);border:1px solid var(--line);border-radius:2px;padding:30px}
.con-card h3{font-size:18px;margin-bottom:16px}
.con-card li{list-style:none;display:flex;gap:14px;padding:8px 0;font-size:15px}
.con-card .k{font-family:'IBM Plex Mono',monospace;font-size:12.5px;color:var(--accent);min-width:74px;padding-top:3px}
.map{width:100%;height:100%;min-height:300px;border:1px solid var(--line);border-radius:2px}

/* join */
.join{display:flex;align-items:center;justify-content:space-between;gap:30px;background:var(--accent-soft);border:1px solid #C4DCDC;padding:34px 38px;border-radius:2px}
.join h3{font-size:22px}
.join p{color:var(--ink-soft);font-size:14.5px;margin-top:6px}
.btn{background:var(--ink);color:#fff;padding:12px 26px;border-radius:2px;font-size:14.5px;white-space:nowrap;display:inline-block}
.btn:hover{background:var(--accent);color:#fff;text-decoration:none}

footer{border-top:1px solid var(--line);padding:34px 0 46px;font-size:13.5px;color:var(--ink-soft)}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}

@media(max-width:820px){
  .res-grid,.mem-grid{grid-template-columns:1fr}
  .two-col,.con-grid,.prof{grid-template-columns:1fr}
  .theme{grid-template-columns:1fr;gap:14px}
  .curve{display:none}
  .join{flex-direction:column;align-items:flex-start}
  .menu{display:none;position:absolute;top:64px;left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);flex-direction:column;padding:14px 28px;gap:14px}
  .menu.show{display:flex}
  .menu-btn{display:block;margin-left:auto}
  .lang-btn{margin-left:0}
  .prof .photo{max-width:220px}
  .timeline li{grid-template-columns:1fr;gap:2px}
}