:root {
  --ink: #1d2730;
  --muted: #65717c;
  --link: #0b4f8a;
  --link-dark: #073d6b;
  --line: #dde3e8;
  --soft: #f6f8fa;
  --white: #ffffff;
  --page-width: 980px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-color: rgba(11, 79, 138, 0.45);
  text-decoration-thickness: 0.06em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--link-dark);
  text-decoration: underline;
}

a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 3px;
}

p,
h1,
h2,
h3,
h4 {
  margin-top: 0;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 8px 12px;
  color: var(--white);
  background: var(--link);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
}

.header-inner {
  width: min(calc(100% - 48px), var(--page-width));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 34px;
}

.site-name {
  color: var(--ink);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.site-name:hover {
  color: var(--ink);
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 0.9rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="true"] {
  color: var(--link);
  text-decoration: none;
}

.site-nav a[aria-current="true"] {
  font-weight: 650;
}

.page-shell {
  width: min(calc(100% - 48px), var(--page-width));
  margin: 0 auto;
  padding: 58px 0 84px;
}

.profile-overview {
  display: grid;
  grid-template-columns: 128px minmax(0, 1fr);
  column-gap: 34px;
  row-gap: 14px;
  align-items: start;
}

.profile-rail {
  grid-column: 1;
  grid-row: 1 / span 2;
  width: 128px;
}

.profile-photo {
  display: block;
  width: 128px;
  max-width: 128px;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--soft);
}

.profile-heading {
  grid-column: 2;
}

.profile-heading h1 {
  margin: -5px 0 4px;
  font-size: 2.05rem;
  line-height: 1.18;
  letter-spacing: -0.035em;
}

.profile-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 0.91rem;
  line-height: 1.5;
}

.profile-bio {
  grid-column: 2;
  min-width: 0;
}

.profile-bio > p {
  max-width: 770px;
  margin-bottom: 12px;
  font-size: 0.98rem;
  line-height: 1.7;
}

.profile-bio > p:last-of-type {
  margin-bottom: 0;
}

.profile-links {
  display: grid;
  gap: 0;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.78rem;
  line-height: 1.35;
}

.profile-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  width: fit-content;
  min-height: 24px;
}

.profile-links a,
.paper-refs a {
  text-decoration: none;
}

.profile-link-icon {
  flex: 0 0 1.35em;
  width: 1.35em;
  text-align: center;
  font-size: 0.96rem;
  line-height: 1;
}

.section {
  padding-bottom: 52px;
  margin-bottom: 52px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 92px;
}

.section:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.section-heading {
  margin-bottom: 22px;
}

.section-heading h2 {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 6px;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.015em;
}

.section-heading h2::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.section-note {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.87rem;
}

.news-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.news-list li {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 20px;
  padding: 7px 0;
}

.news-list time {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 600;
  white-space: nowrap;
}

.news-list p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.58;
}

.news-icon {
  display: inline-block;
  width: 1.65em;
  text-align: left;
}

.research-list {
  border-top: 1px solid var(--line);
}

.research-list article {
  display: grid;
  grid-template-columns: minmax(190px, 0.82fr) minmax(0, 1.2fr) auto;
  gap: 20px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.research-list h3 {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.45;
}

.research-list article > p:not(.paper-refs) {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.paper-refs {
  margin: 0;
  font-size: 0.79rem;
  font-weight: 650;
  line-height: 1.6;
  white-space: nowrap;
}

.publication-group {
  margin-top: 42px;
}

.group-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 11px;
  border-bottom: 1px solid var(--ink);
}

.group-heading h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.4;
}

.group-heading span {
  color: var(--muted);
  font-size: 0.77rem;
  white-space: nowrap;
}

.publication-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.publication {
  position: relative;
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 16px;
  padding: 19px 0 20px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 92px;
}

.anchor-target {
  position: absolute;
  top: -92px;
}

.publication-index {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  margin: 1px 0 0;
  color: var(--link);
  font-size: 0.77rem;
  font-weight: 700;
}

.publication h4 {
  margin-bottom: 5px;
  font-size: 1rem;
  font-weight: 650;
  line-height: 1.42;
  overflow-wrap: anywhere;
}

.publication h4 a {
  color: var(--ink);
}

.publication h4 a:hover {
  color: var(--link);
}

.publication div > p {
  margin-bottom: 3px;
  color: #48535d;
  font-size: 0.86rem;
  line-height: 1.5;
}

.publication .venue {
  margin-bottom: 0;
  color: var(--link);
  font-size: 0.82rem;
  font-weight: 600;
}

.publication .venue span {
  margin-left: 6px;
  color: var(--muted);
  font-weight: 400;
}

.combined-note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.79rem;
}

.domestic-details {
  margin-top: 42px;
  border-bottom: 1px solid var(--line);
}

.domestic-details summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 0 0 11px;
  border-bottom: 1px solid var(--ink);
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 700;
}

.domestic-details summary::-webkit-details-marker {
  display: none;
}

.domestic-details summary::before {
  content: "+";
  order: 3;
  color: var(--link);
  font-size: 1.1rem;
  font-weight: 400;
}

.domestic-details[open] summary::before {
  content: "−";
}

.domestic-details summary span:nth-child(2) {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.77rem;
  font-weight: 400;
  white-space: nowrap;
}

.domestic-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.domestic-list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 92px;
}

.domestic-list li:last-child {
  border-bottom: 0;
}

.domestic-list li > span {
  color: var(--link);
  font-size: 0.76rem;
  font-weight: 700;
}

.domestic-list p {
  margin: 0;
  color: #48535d;
  font-size: 0.84rem;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.domestic-list a {
  color: var(--ink);
  font-weight: 600;
}

.domestic-list a:hover {
  color: var(--link);
}

.site-footer {
  border-top: 1px solid var(--line);
}

.site-footer > div {
  width: min(calc(100% - 48px), var(--page-width));
  margin: 0 auto;
  padding: 25px 0 32px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font-size: 0.78rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 820px) {
  .research-list article {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .paper-refs {
    white-space: normal;
  }
}

@media (max-width: 680px) {
  html {
    scroll-padding-top: 24px;
  }

  .site-header {
    position: static;
  }

  .header-inner {
    width: min(calc(100% - 32px), var(--page-width));
    min-height: 92px;
    padding: 11px 0 9px;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 6px;
  }

  .site-nav {
    width: 100%;
    gap: 18px;
    overflow-x: auto;
    padding-bottom: 2px;
    font-size: 0.84rem;
    scrollbar-width: none;
  }

  .site-nav::-webkit-scrollbar {
    display: none;
  }

  .site-nav a {
    flex: 0 0 auto;
  }

  .page-shell {
    width: min(calc(100% - 32px), var(--page-width));
    padding: 34px 0 64px;
  }

  .profile-overview {
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: 20px;
    row-gap: 24px;
  }

  .profile-rail {
    grid-row: 1;
    width: 104px;
  }

  .profile-photo {
    width: 104px;
    max-width: 104px;
  }

  .profile-heading h1 {
    margin-top: -3px;
    font-size: 1.65rem;
  }

  .profile-bio {
    grid-column: 1 / -1;
  }

  .profile-links {
    margin-top: 10px;
    font-size: 0.74rem;
  }

  .section {
    padding-bottom: 44px;
    margin-bottom: 44px;
    scroll-margin-top: 24px;
  }

  .publication,
  .domestic-list li {
    scroll-margin-top: 24px;
  }

  .site-footer > div {
    width: min(calc(100% - 32px), var(--page-width));
    flex-direction: column;
    gap: 2px;
  }
}

@media (max-width: 520px) {
  .profile-overview {
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: 16px;
  }

  .profile-rail {
    width: 104px;
  }

  .profile-photo {
    width: 104px;
    max-width: 104px;
  }

  .profile-heading h1 {
    font-size: 1.45rem;
  }

  .profile-heading p {
    font-size: 0.8rem;
  }

  .profile-links {
    font-size: 0.72rem;
  }

  .profile-links a {
    gap: 4px;
    white-space: nowrap;
  }

  .profile-link-icon {
    flex-basis: 1.2em;
    width: 1.2em;
  }

  .profile-bio > p {
    font-size: 0.94rem;
  }

  .news-list li {
    grid-template-columns: 1fr;
    gap: 1px;
    padding: 8px 0;
  }

  .publication {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .publication-index {
    margin: 0;
  }

  .publication .venue span {
    display: block;
    margin-left: 0;
  }

  .group-heading,
  .domestic-details summary {
    align-items: flex-start;
  }

  .domestic-details summary span:nth-child(2) {
    display: none;
  }

  .domestic-list li {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 10px;
  }
}

@media print {
  .site-header,
  .site-footer,
  .profile-links {
    display: none;
  }

  .page-shell {
    width: 100%;
    display: block;
    padding: 0;
  }

  .profile-overview {
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: 24px;
  }

  .profile-rail {
    width: 104px;
  }

  .profile-photo {
    width: 104px;
    max-width: 104px;
  }

  .section {
    break-inside: avoid;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}