:root {
  --ink: #202124;
  --muted: #50545a;
  --accent: #245b91;
  --line: #dedede;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: #fff;
  font-size: 17px;
  line-height: 1.65;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 20px; }
body { margin: 0; }
p, h1, h2, h3, h4, figure { margin: 0; }
a { color: var(--accent); text-decoration: none; text-underline-offset: 3px; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
img { display: block; max-width: 100%; }
strong { font-weight: 600; }
.wrap { width: min(1000px, calc(100% - 64px)); margin-inline: auto; }
.skip-link { position: absolute; left: 16px; top: -100px; background: white; padding: 10px; }
.skip-link:focus { top: 10px; }
.site-header { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.wordmark { display: inline-flex; color: var(--ink); }
.piano-mark { width: 48px; height: 32px; }
.site-header nav { display: flex; flex-wrap: wrap; gap: 12px 24px; font-size: 15px; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 40px; padding: 36px 0; align-items: start; }
h1 { font-size: 38px; line-height: 1.2; font-weight: 600; }
.name-korean { margin-left: 0.65em; color: var(--muted); font-family: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans CJK KR", sans-serif; font-size: 0.46em; font-weight: 400; letter-spacing: -0.025em; white-space: nowrap; vertical-align: 0.08em; }
.bio { margin-top: 12px; }
.interests { display: flex; flex-wrap: nowrap; gap: 18px; grid-column: 1 / -1; width: 100%; min-width: 0; overflow-x: auto; padding: 0 0 4px; margin: 0; list-style: none; font-size: 16px; color: var(--muted); }
.interests li { flex: 0 0 auto; }
.interests:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.contact-links { display: flex; flex-wrap: wrap; gap: 8px 32px; font-size: 16px; margin-top: 18px; }
.portrait { padding-top: 0; }
.portrait-frame { overflow: hidden; border-radius: 50%; width: 220px; height: 220px; position: relative; margin-inline: auto; }
.portrait img { position: absolute; width: 100%; max-width: none; height: 100%; object-fit: cover; object-position: center top; left: 0; top: 0; }
.portrait figcaption { display: grid; justify-items: center; text-align: center; gap: 6px; font-size: 15px; color: var(--muted); margin-top: 12px; }
.icon { width: 18px; height: 18px; flex: 0 0 18px; fill: currentColor; }
.contact-links a, .portrait-detail { display: inline-flex; align-items: center; gap: 7px; }
.portrait-detail { white-space: normal; }
.portrait-role { font-weight: 600; color: var(--ink); }
.school-logo, .company-logo { display: flex; align-items: center; justify-content: center; width: 96px; height: 96px; overflow: hidden; position: relative; justify-self: center; align-self: center; }
.school-logo img { position: absolute; width: 160%; max-width: none; height: auto; left: -29%; top: -43%; }
.company-logo { width: 130px; }
.company-logo img { width: 100%; height: auto; max-height: 100%; object-fit: contain; }
.samsung-logo { width: 130px; height: auto; overflow: visible; }
.samsung-logo img { width: 130px; max-height: none; }
.section { border-top: 1px solid var(--line); padding: 28px 0; }
h2 { font-size: 26px; line-height: 1.35; font-weight: 600; }
.section-heading { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 10px 24px; }
.quiet-link, .section-meta, .section-intro { font-size: 15px; color: var(--muted); }
.section-intro { margin-top: 10px; }
.news-list { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 9px; }
.news-list li { display: grid; grid-template-columns: 100px minmax(0, 1fr); gap: 16px; font-size: 16px; line-height: 1.5; }
.news-list time { font-size: 15px; color: var(--muted); padding-top: 2px; }
.publication-category-heading { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px 24px; margin-top: 30px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.publication-category { font-size: 17px; font-weight: 600; color: var(--muted); }
.publications { margin-top: 24px; }
.paper-visual-pending { min-height: 180px; }
.publication { display: grid; grid-template-columns: 245px minmax(0, 1fr); gap: 28px; padding: 24px 0; border-bottom: 1px solid var(--line); align-items: start; }
.publication:first-child { padding-top: 0; }
.publication:last-child { border-bottom: 0; padding-bottom: 0; }
.paper-visual { display: flex; flex-direction: column; justify-content: center; min-width: 0; color: var(--muted); }
.paper-visual img { width: 100%; height: 180px; object-fit: contain; }
.venue { display: flex; flex-wrap: wrap; gap: 6px 10px; font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.venue .distinction { font-weight: 400; color: var(--muted); }
h3, h4 { font-size: 20px; line-height: 1.4; font-weight: 600; }
.paper-copy h4 a, .patent-list h3 a { color: var(--ink); }
.paper-copy h4 a:hover, .patent-list h3 a:hover { color: var(--accent); }
.authors { font-size: 15px; line-height: 1.65; margin-top: 8px; color: var(--muted); }
.authors strong { color: var(--ink); }
.paper-keywords { font-size: 15px; color: var(--muted); margin-top: 10px; }
.paper-links { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 10px; font-size: 16px; }
.publication-note { font-size: 14px; color: var(--muted); margin-left: auto; text-align: right; }
.concept { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 16px 8px; min-height: 180px; border: 1px solid var(--line); }
.concept-overline, .concept-target { font-size: 15px; text-align: center; }
.concept-pair { display: flex; align-items: center; gap: 18px; font-size: 24px; margin-top: 12px; }
.concept-line { width: 1px; height: 14px; background: #888; margin: 10px 0; }
.latent-units { display: flex; gap: 18px; font-size: 24px; margin-top: 12px; }
.timeline { margin-top: 20px; }
.timeline-entry { display: grid; grid-template-columns: 130px minmax(0, 1fr) max-content; column-gap: 24px; margin-top: 26px; align-items: start; }
.timeline-copy { min-width: 0; margin-left: 20px; }
.current-status { display: block; margin-top: 4px; }
.date-range { font-size: 15px; color: var(--muted); padding-top: 3px; text-align: right; white-space: nowrap; }
.role { font-size: 17px; margin-top: 3px; }
.entry-detail { font-size: 16px; margin-top: 8px; }
.patent-list { list-style: none; padding: 0; margin: 20px 0 0; }
.patent-list li { display: grid; grid-template-columns: 55px minmax(0, 1fr); gap: 20px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.patent-list li:last-child { border: 0; padding-bottom: 0; }
.patent-year { font-size: 15px; color: var(--muted); }
.patent-list h3 { font-size: 17px; line-height: 1.55; font-weight: 500; }
.patent-list p { font-size: 15px; margin-top: 6px; color: var(--muted); }
.patent-search { font-size: 15px; }
.site-footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; border-top: 1px solid var(--line); padding: 20px 0; font-size: 15px; color: var(--muted); }
.image-fallback { display: flex; align-items: center; justify-content: center; padding: 16px; min-height: 160px; font-size: 15px; background: #f5f5f5; }
@media (max-width: 1000px) {
  .timeline-copy { margin-left: 5px; }
}
@media (max-width: 800px) {
  .timeline-copy { margin-left: 0; }
  .hero { grid-template-columns: minmax(0, 1fr) 240px; gap: 24px; }
  .publication { grid-template-columns: 200px minmax(0, 1fr); gap: 24px; }
  .timeline-entry { grid-template-columns: 80px minmax(0, 1fr); gap: 8px 16px; }
  .school-logo, .company-logo { width: 80px; height: 80px; grid-row: span 2; }
  .samsung-logo { width: 112px; height: auto; }
  .samsung-logo img { width: 112px; }
  .date-range { grid-column: 2; justify-self: end; }
}
@media (max-width: 600px) {
  .wrap { width: calc(100% - 36px); }
  .site-header { flex-direction: column; align-items: flex-start; gap: 10px; padding: 16px 0; }
  .site-header nav { gap: 10px 20px; }
  .hero { display: flex; flex-direction: column; gap: 24px; padding: 28px 0; }
  h1 { font-size: 34px; }
  .portrait { width: min(260px, 100%); padding: 0; }
  .portrait-frame { width: 200px; height: 200px; margin-inline: auto; }
  .portrait figcaption { width: 100%; }
  h2 { font-size: 24px; }
  .news-list li { grid-template-columns: 1fr; gap: 2px; }
  .publication { grid-template-columns: 1fr; gap: 16px; }
  .paper-visual { max-width: 360px; }
  .paper-visual-pending { display: none; }
  .paper-visual img { height: auto; max-height: 240px; }
  .timeline-entry { grid-template-columns: 72px minmax(0, 1fr); gap: 8px 12px; }
  .school-logo, .company-logo { width: 72px; height: 72px; }
  .samsung-logo { width: 86px; height: auto; }
  .samsung-logo img { width: 86px; }
  .patent-list li { grid-template-columns: 1fr; gap: 5px; }
  .patent-list p span { display: block; }
}
@media print {
  .wrap { width: 100%; }
  .site-header, .skip-link, .site-footer { display: none; }
  .hero { padding-top: 0; }
  .section { padding: 18px 0; }
  .publication, .timeline-entry, .patent-list li { break-inside: avoid; }
}