/* Hyunsoo Yun — personal site
   Clean sans aesthetic (à la system SF / Inter). Blue links.
   Paper #FFFFFF / ink #1A1A1A / accent #2563C7 */

:root{
  --bg:#FFFFFF;
  --ink:#1A1A1A;
  --muted:#6E6E73;
  --rule:#E8E8E8;
  --soft:#F5F5F5;
  --accent:#2563C7;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--sans);
  font-size:16px;line-height:1.6;font-weight:400;
  -webkit-font-smoothing:antialiased;letter-spacing:-.006em;
}
a{color:inherit;text-decoration:none}
a:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

.wrap{max-width:900px;margin:0 auto;padding:0 28px}

/* nav */
nav.site{
  display:flex;align-items:center;gap:30px;
  padding:22px 0;border-bottom:1px solid var(--rule);flex-wrap:wrap;
}
.sig{font-size:18px;font-weight:600;letter-spacing:-.01em;margin-right:8px}
.links{display:flex;gap:26px}
.links a{color:var(--ink);font-size:15px;font-weight:450;transition:color .15s}
.links a:hover{color:var(--accent)}
.links a.on{color:var(--accent)}

/* hero — side by side */
.hero{padding:42px 0 34px;display:grid;grid-template-columns:1fr 208px;gap:42px;align-items:start;border-bottom:1px solid var(--rule)}
.hero-text{min-width:0}
.portrait{width:100%;border-radius:12px;display:block;box-shadow:0 1px 3px rgba(0,0,0,.06)}
h1{
  font-size:clamp(30px,5vw,38px);line-height:1.1;
  font-weight:700;letter-spacing:-.025em;margin:0 0 12px;
}
.role{font-size:18px;margin:0 0 22px;color:var(--muted);font-weight:400}
.role b{font-weight:400;color:var(--ink)}
.role .m{color:var(--muted);padding:0 4px}
.role a{color:var(--accent)}
.about{color:var(--ink);margin:0 0 13px;font-size:15.5px;line-height:1.62}
.about:last-of-type{margin-bottom:0}
.about a{color:var(--accent)}
.about a:hover{text-decoration:underline}

/* social icon row under photo */
.social{display:flex;gap:16px;margin-top:16px;justify-content:flex-start;align-items:center;flex-wrap:wrap}
.social a{color:var(--muted);display:inline-flex;transition:color .15s}
.social a:hover{color:var(--accent)}
.social svg{width:20px;height:20px;display:block}

/* sections */
section{padding:30px 0 0}
h2{
  font-size:13px;font-weight:600;letter-spacing:.02em;
  text-transform:uppercase;color:var(--muted);
  margin:0 0 16px;
}

/* rows */
ul.rows{list-style:none;margin:0;padding:0}
ul.rows li{display:grid;grid-template-columns:104px 1fr;gap:20px;padding:9px 0;border-bottom:1px solid var(--rule)}
ul.rows li:last-child{border-bottom:0}
.yr{font-size:14px;color:var(--muted);padding-top:2px;font-variant-numeric:tabular-nums}
.txt{font-size:16px;line-height:1.55}
.txt b{font-weight:600}
.sub{display:block;color:var(--muted);font-size:14.5px;margin-top:2px}
.sub a{color:var(--accent)}
.sub a:hover{text-decoration:underline}
.loc{display:block;color:var(--muted);font-size:14px;margin-top:1px}
.role{display:block;margin-top:10px;font-size:15px;font-weight:500;color:var(--ink)}
.rdate{display:block;color:var(--muted);font-size:13px;font-weight:400;margin-top:1px;font-variant-numeric:tabular-nums}
.venue{color:var(--muted)}
.ptitle{color:var(--ink);transition:color .15s}
.ptitle:hover{color:var(--accent);text-decoration:underline}
.me{font-weight:600;color:var(--ink)}
.pin{
  display:inline-block;font-size:11.5px;font-weight:500;color:var(--accent);
  border:1px solid var(--rule);border-radius:6px;
  padding:1.5px 8px;margin-left:6px;white-space:nowrap;
  letter-spacing:.01em;transition:all .15s;vertical-align:1px;
}
a.pin:hover{border-color:var(--accent);background:var(--accent);color:#fff}
.pin.code{color:var(--ink)}
a.pin.code:hover{border-color:var(--ink);background:var(--ink);color:#fff}
.links-row .pin{margin-left:0}
.workcard .links-row{margin-top:9px;padding-top:0}
.foot-note{color:var(--muted);font-size:14px;margin-top:16px}

/* research page */
.research-intro{font-size:16px;line-height:1.6;color:var(--muted);max-width:66ch;margin:14px 0 0}
.research-intro a{color:var(--accent)}
.ritem{padding:20px 0;border-bottom:1px solid var(--rule)}
.ritem:last-child{border-bottom:0}
.ritem h3{font-size:19px;font-weight:600;letter-spacing:-.01em;margin:0 0 4px;line-height:1.3}
.ritem .tagline{color:var(--muted);margin:0 0 12px;font-size:16px}
.ritem p{margin:0 0 12px;font-size:16px;line-height:1.6;max-width:70ch}
.ritem p:last-child{margin-bottom:0}
.rmeta{font-size:13px;letter-spacing:.01em;color:var(--muted);margin-bottom:10px;font-weight:500}
.rmeta.live{color:var(--accent)}
.links-row{display:flex;gap:8px;padding-top:4px;flex-wrap:wrap}

/* news — vertical scroll strip */
.newsscroll{
  display:flex;flex-direction:column;gap:10px;
  max-height:360px;overflow-y:auto;overscroll-behavior-y:contain;
  scroll-snap-type:y proximity;-webkit-overflow-scrolling:touch;
  padding:2px 4px 2px 0;
  scrollbar-width:thin;scrollbar-color:var(--rule) transparent;
}
.newsscroll::-webkit-scrollbar{width:6px}
.newsscroll::-webkit-scrollbar-thumb{background:var(--rule);border-radius:999px}
.newsscroll::-webkit-scrollbar-thumb:hover{background:var(--muted)}
.newscard{
  scroll-snap-align:start;
  display:grid;grid-template-columns:118px 1fr;gap:18px;align-items:baseline;
  border:1px solid var(--rule);border-radius:12px;padding:14px 18px;
  background:var(--bg);transition:border-color .18s,transform .18s,box-shadow .18s;
}
.newscard:hover{border-color:var(--muted);transform:translateX(3px);box-shadow:0 6px 20px rgba(0,0,0,.06)}
.newscard .yr{font-size:14px;color:var(--accent);font-weight:500;font-variant-numeric:tabular-nums;white-space:nowrap}
.newscard p{margin:0;font-size:15px;line-height:1.5;color:var(--ink)}

@media(max-width:680px){
  .newscard{grid-template-columns:1fr;gap:3px}
}

/* upcoming */
.upcoming-lead{font-size:16px;line-height:1.6;color:var(--ink);max-width:66ch;margin:0 0 18px}
.upcoming-lead a{color:var(--accent)}
.upcoming-lead a:hover{text-decoration:underline}

/* filter chips */
.filterbar{display:flex;gap:8px;flex-wrap:wrap;margin:2px 0 -8px}
.chip{
  font-size:13px;font-weight:500;
  background:transparent;color:var(--muted);
  border:1px solid var(--rule);border-radius:999px;
  padding:5px 15px;cursor:pointer;transition:all .15s;font-family:inherit;
}
.chip:hover{color:var(--ink);border-color:var(--muted)}
.chip.on{color:#fff;background:var(--ink);border-color:var(--ink)}

footer{
  margin-top:40px;padding:20px 0 52px;border-top:1px solid var(--rule);
  display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
  font-size:14px;color:var(--muted);
}
footer a{color:var(--ink)}
footer a:hover{color:var(--accent)}

@media(max-width:680px){
  .hero{grid-template-columns:1fr;padding:34px 0 30px;gap:26px}
  .portrait{max-width:220px}
  .social{margin-top:12px}
  ul.rows li{grid-template-columns:1fr;gap:3px}
  .yr{padding-top:0}
  nav.site{gap:18px}
  .links{gap:20px}
}

/* ── Research hub sub-tabs ── */
.subtabs{display:flex;gap:8px;margin:18px 0 8px;flex-wrap:wrap}
.subtab{
  font-size:14px;font-weight:500;font-family:inherit;
  background:transparent;color:var(--muted);
  border:1px solid var(--rule);border-radius:999px;
  padding:6px 16px;cursor:pointer;transition:all .15s;
}
.subtab:hover{color:var(--ink);border-color:var(--muted)}
.subtab.on{color:#fff;background:var(--ink);border-color:var(--ink)}
.rpane{display:none}
.rpane.on{display:block}
.theme-note{color:var(--ink);font-size:16px;line-height:1.6;max-width:70ch;margin:0 0 8px}

/* publication accordions */
.pubgroup{border-top:1px solid var(--rule)}
.pubgroup:last-of-type{border-bottom:1px solid var(--rule)}
.pubgroup summary{
  list-style:none;cursor:pointer;user-select:none;
  display:flex;align-items:center;gap:10px;
  padding:15px 12px;margin:0 -12px;border-radius:10px;
  font-size:13px;font-weight:600;letter-spacing:.02em;text-transform:uppercase;
  color:var(--muted);transition:color .15s,background .15s;
}
.pubgroup summary::-webkit-details-marker{display:none}
.pubgroup summary:hover{color:var(--ink);background:var(--soft)}
.pubgroup[open] summary{color:var(--ink)}
.pubgroup .expand{
  margin-left:auto;font-size:11.5px;font-weight:500;color:var(--muted);
  letter-spacing:.01em;text-transform:none;transition:color .15s;
}
.pubgroup .expand::after{content:"Show"}
.pubgroup[open] .expand::after{content:"Hide"}
.pubgroup summary:hover .expand,.pubgroup[open] .expand{color:var(--accent)}
.pubgroup .chev{width:13px;height:13px;color:var(--muted);flex:none;transition:transform .22s ease,color .15s}
.pubgroup summary:hover .chev,.pubgroup[open] .chev{color:var(--accent)}
.pubgroup[open] summary .chev{transform:rotate(90deg)}
.pubgroup > ul.rows{padding-bottom:8px}
.pubgroup[open] > ul.rows{animation:pubreveal .24s ease}
.pubgroup .foot-note{margin-top:6px;padding-bottom:14px}
@keyframes pubreveal{from{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:none}}
.tolink{color:var(--accent);cursor:pointer}
.tolink:hover{text-decoration:underline}

/* selected work cards with thumbnail */
.workcard{
  display:grid;grid-template-columns:auto 1fr;gap:28px;align-items:center;
  padding:16px;border:1px solid var(--rule);border-radius:14px;
  margin-bottom:12px;background:var(--bg);
  transition:border-color .18s,box-shadow .18s,transform .18s;
}
.workcard:last-child{margin-bottom:0}
.workcard:hover{border-color:#d6d6da;box-shadow:0 8px 26px rgba(0,0,0,.07);transform:translateY(-2px)}
.workcard .thumb{
  height:206px;width:auto;max-width:100%;
  border-radius:9px;border:1px solid var(--rule);display:block;background:var(--soft);
}
.workcard h3{font-size:19px;font-weight:600;letter-spacing:-.012em;margin:0 0 8px;line-height:1.32}
.workcard .rmeta{font-size:13px;color:var(--muted);margin:0;font-weight:500}
.workcard .rmeta.live{color:var(--accent)}
.workcard .authors{margin:0 0 8px;font-size:15px;line-height:1.5;color:var(--muted)}
.workcard .authors .me{color:var(--ink)}

@media(max-width:680px){
  .workcard{grid-template-columns:1fr;gap:12px;padding:14px}
  .workcard .thumb{height:auto;width:100%;max-width:100%}
  .subtabs{margin:14px 0 4px}
}