:root {
  --ink: #1b1d21;
  --text: #33373d;
  --muted: #6a7078;
  --faint: #9aa0a8;
  --rule: #e4e6ea;
  --accent: #173f6b;
  --accent-soft: #eef3f9;
  --bg: #ffffff;
  --serif: "Source Serif 4", Georgia, "Noto Serif KR", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", Helvetica, Arial, sans-serif;
  --gutter: clamp(24px, 6vw, 96px);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #eceef1; --text: #d3d6db; --muted: #a0a6ae; --faint: #7a8089; --rule: #2d3137;
          --accent: #9cc0ea; --accent-soft: #1d2733; --bg: #121417; color-scheme: dark; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 var(--sans); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.wrap { max-width: 1040px; margin: 0 auto; padding-inline: var(--gutter); }

/* top menu */
.topbar { position: sticky; top: 0; z-index: 10; background: var(--bg); border-bottom: 1px solid var(--rule); }
html { scroll-padding-top: 96px; }
.bar { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 10px 32px;
       padding-block: 30px 22px; }
.brand { font: 600 22px/1.2 var(--serif); color: var(--ink); letter-spacing: -.005em; }
.brand:hover { text-decoration: none; }
.menu { display: flex; flex-wrap: wrap; gap: 6px 28px; }
.menu a { color: var(--muted); font-size: 15px; font-weight: 500; padding-bottom: 4px; border-bottom: 2px solid transparent; }
.menu a:hover { color: var(--ink); text-decoration: none; }
.menu a.on { color: var(--accent); border-bottom-color: var(--accent); }

.main { padding-block: clamp(40px, 7vh, 72px) 24px; min-height: 60vh; }

/* home */
.home { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: clamp(32px, 6vw, 72px); }
.portrait { display: block; width: 100%; max-width: 250px; height: auto;
            border-radius: 4px; margin: 0 0 22px; }
@media (max-width: 820px) { .portrait { max-width: 200px; } }
h1 { font: 600 32px/1.15 var(--serif); color: var(--ink); letter-spacing: -.01em; margin: 0 0 12px; }
.position { margin: 0 0 6px; color: var(--ink); font-weight: 500; }
.affil { margin: 0 0 4px; color: var(--muted); font-size: 14.5px; line-height: 1.5; }
.email { margin: 14px 0 0; color: var(--muted); font-size: 14.5px; }
.profiles { list-style: none; margin: 22px 0 0; padding: 18px 0 0; border-top: 1px solid var(--rule); font-size: 14.5px; }
.profiles li { margin: 0 0 6px; }
.profiles a { color: var(--ink); font-weight: 500; }
.profiles a:hover { color: var(--accent); }
.home-text { max-width: 640px; }
.lede { font: 400 22px/1.45 var(--serif); color: var(--ink); margin: 0 0 20px; }
.home-text p { margin: 0 0 14px; }

/* section headings */
h2 { font: 600 12.5px/1 var(--sans); text-transform: uppercase; letter-spacing: .12em; color: var(--accent);
     margin: 44px 0 18px; padding-bottom: 10px; border-bottom: 1px solid var(--rule); }
.home-text h2 { margin-top: 36px; }
.page-title { font-size: 34px; margin-bottom: 8px; }
.intro { color: var(--muted); margin: 0 0 8px; max-width: 680px; }
.list { max-width: 860px; margin-top: 32px; }
.list > h2:first-child { margin-top: 0; }
.list h2 { font: 600 23px/1.3 var(--serif); text-transform: none; letter-spacing: 0; color: var(--ink);
           margin: 52px 0 18px; padding-bottom: 10px; }

/* CV page */
.cv-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 12px 24px; }
.cv-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin: 0; }
.btn { display: inline-block; background: var(--accent); color: var(--bg); font-size: 14.5px; font-weight: 600;
       padding: 9px 18px; border-radius: 4px; }
.btn:hover { text-decoration: none; opacity: .9; }
.btn-plain { font-size: 14.5px; }
.cv-view { display: block; width: 100%; height: 85vh; min-height: 520px; margin-top: 24px;
           border: 1px solid var(--rule); border-radius: 4px; background: var(--bg); }

/* entries */
.paper { margin: 0 0 22px; }
.paper.has-fig { display: grid; grid-template-columns: minmax(0, 1fr) 200px; gap: 28px; align-items: start;
                 padding-bottom: 22px; border-bottom: 1px solid var(--rule); }
.pfig { margin: 2px 0 0; }
.pfig img { display: block; width: 100%; height: auto; max-height: 190px; object-fit: contain; background: #fff;
            border: 1px solid var(--rule); border-radius: 3px; padding: 4px; }
.pfig a:hover img { border-color: var(--accent); }
.pfig figcaption { margin-top: 6px; font-size: 12px; line-height: 1.4; color: var(--muted); }
@media (max-width: 820px) {
  .paper.has-fig { display: block; }
  .pfig { max-width: 280px; margin-top: 14px; }
}
.prev { margin: 2px 0 0; font-size: 14px; color: var(--muted); }
.prev a { color: var(--muted); text-decoration: underline; text-decoration-color: var(--rule); text-underline-offset: 3px; }
.prev a:hover { color: var(--accent); }
.ptitle { font: 600 17px/1.4 var(--serif); color: var(--ink); margin: 0 0 3px; }
.ptitle a { color: var(--ink); }
.ptitle a:hover { color: var(--accent); text-decoration: none; }
.authors, .venue, .desc, .cite { margin: 0; font-size: 14.5px; color: var(--muted); }
.authors strong { color: var(--ink); font-weight: 600; }
.venue em { color: var(--text); }
.award { display: inline-block; margin: 6px 0 0; font-size: 12.5px; font-weight: 500; color: var(--accent);
         background: var(--accent-soft); border-radius: 3px; padding: 1px 8px; }
.pfoot { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 7px; }
.pfoot .plinks { margin: 0; }
.abs { order: 0; }
.abs[open] { flex-basis: 100%; margin-bottom: 4px; }
.abs summary { display: block; width: fit-content; cursor: pointer; list-style: none; font-size: 12px; font-weight: 500; color: var(--accent);
               border: 1px solid var(--rule); border-radius: 3px; padding: 1px 8px; }
.abs summary::-webkit-details-marker { display: none; }
.abs summary::after { content: " +"; }
.abs[open] summary::after { content: " –"; }
.abs summary:hover { border-color: var(--accent); }
.abs p { margin: 10px 0 0; font-size: 14.5px; line-height: 1.6; color: var(--text); max-width: 700px; }
.plinks { margin: 7px 0 0; display: flex; flex-wrap: wrap; gap: 6px; }
.plinks a { font-size: 12px; font-weight: 500; letter-spacing: .02em; color: var(--accent);
            border: 1px solid var(--rule); border-radius: 3px; padding: 1px 8px; }
.plinks a:hover { border-color: var(--accent); text-decoration: none; }
.cite { margin-top: 6px; }
.label { font-size: 11.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .09em; color: var(--faint); margin-right: 6px; }
.edu { margin: 0; padding-left: 18px; }
.edu li { margin-bottom: 4px; }

.foot { border-top: 1px solid var(--rule); padding-block: 22px 44px; margin-top: 56px; font-size: 12.5px; color: var(--faint); }

/* data page: image beside text */
.datasets { max-width: 920px; }
.dataset { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 32px; align-items: start;
           padding: 0 0 36px; margin: 0 0 36px; border-bottom: 1px solid var(--rule); }
.dataset:last-child { border-bottom: 0; }
.dfig { margin: 0; }
.dfig img { display: block; width: 100%; height: auto; border: 1px solid var(--rule); border-radius: 3px; background: #fff; }
.dfig figcaption { margin-top: 8px; font-size: 13px; line-height: 1.45; color: var(--muted); }
.dtext .ptitle { margin-top: 0; }
.dcompare { grid-column: 1 / -1; margin: 4px 0 0; }
.dcompare .pair { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 640px; }
.dcompare img { display: block; width: 100%; height: auto; border: 1px solid var(--rule); border-radius: 3px; }
.dcompare .plabel { display: block; margin-top: 6px; font-size: 13px; font-weight: 500; color: var(--ink); }
.dcompare figcaption { margin-top: 10px; font-size: 13px; line-height: 1.45; color: var(--muted); max-width: 65ch; }

/* narrow screens */
@media (max-width: 820px) {
  .dataset { display: block; }
  .dfig { margin-bottom: 18px; max-width: 480px; }
  .dcompare { margin-top: 20px; }
  .dcompare .pair { gap: 10px; }
  .home { display: block; }
  .home-id { padding-bottom: 24px; margin-bottom: 28px; border-bottom: 1px solid var(--rule); }
  .profiles { display: flex; flex-wrap: wrap; gap: 4px 18px; border-top: 0; padding-top: 0; margin-top: 14px; }
  .bar { padding-block: 14px 10px; }
  .menu { gap: 6px 16px; flex-wrap: nowrap; overflow-x: auto; max-width: 100%; scrollbar-width: none; -webkit-overflow-scrolling: touch; }
  .menu::-webkit-scrollbar { display: none; }
  .menu a { font-size: 14px; white-space: nowrap; flex: none; }
  h1 { font-size: 28px; }
  .page-title { font-size: 28px; }
}

/* projects */
.projects { max-width: 760px; }
.project { padding: 0 0 32px; margin: 0 0 32px; border-bottom: 1px solid var(--rule); }
.project:last-child { border-bottom: 0; }
.project .venue { margin: 0 0 12px; }
.people { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 4px 16px; margin: 14px 0 0; font-size: 15px; }
.people dt { color: var(--muted); }
.people dd { margin: 0; color: var(--text); }
@media (max-width: 520px) { .people { grid-template-columns: 1fr; } .people dd { margin-bottom: 8px; } }

/* data and projects: running text matches the home page */
.dataset .desc, .project .desc { font-size: 16px; line-height: 1.65; color: var(--text); margin: 0 0 12px; }
.dataset .cite { font-size: 15px; color: var(--text); }
.project .venue { font-size: 15px; color: var(--muted); }
.people { font-size: 16px; }
.intro { color: var(--text); }