:root {
  --paper: #f7f8f5;
  --surface: #ffffff;
  --surface-soft: #eef2ef;
  --ink: #17201e;
  --muted: #5d6966;
  --line: #d6ddda;
  --teal: #14776d;
  --teal-dark: #0c4d47;
  --teal-soft: #dcece8;
  --amber: #c48525;
  --amber-soft: #f4e5c7;
  --plum: #745366;
  --max-width: 1160px;
  --radius: 6px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 82px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

a:hover {
  color: var(--teal);
}

a:focus-visible,
button:focus-visible,
video:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 3px;
}

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

h1,
h2,
h3 {
  letter-spacing: 0;
}

h1,
h2 {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-weight: 600;
  line-height: 1.08;
}

h3 {
  line-height: 1.28;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1000;
  transform: translateY(-150%);
  padding: 10px 14px;
  border-radius: 4px;
  background: var(--ink);
  color: #fff;
}

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

.section-shell,
.nav-shell {
  width: min(calc(100% - 48px), var(--max-width));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 248, 245, 0.96);
  border-bottom: 1px solid var(--line);
}

.nav-shell {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.site-name {
  flex: 0 0 auto;
  font-weight: 700;
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  white-space: nowrap;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--ink);
}

.intro {
  padding-block: 72px 56px;
}

.identity-row {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr);
  align-items: center;
  gap: 40px;
  max-width: 980px;
}

.portrait {
  width: 168px;
  height: 224px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--surface-soft);
}

.eyebrow,
.section-index,
.publication-meta {
  margin-bottom: 10px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.3;
  text-transform: uppercase;
  letter-spacing: 0;
}

.intro h1 {
  max-width: 900px;
  margin-bottom: 22px;
  font-size: 3.5rem;
}

.intro-text {
  max-width: 790px;
  margin-bottom: 14px;
  color: #36413e;
  font-size: 1.1rem;
}

.affiliation {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.action-row,
.paper-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.action-row {
  margin-top: 34px;
}

.action-link {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--surface);
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 650;
  line-height: 1.2;
  text-decoration: none;
}

.action-link:hover {
  border-color: var(--teal);
  color: var(--teal-dark);
}

.action-link.primary {
  border-color: var(--teal-dark);
  background: var(--teal-dark);
  color: #fff;
}

.action-link.primary:hover {
  border-color: var(--teal);
  background: var(--teal);
  color: #fff;
}

.action-link.disabled {
  color: #8b9491;
  cursor: not-allowed;
}

.featured-band {
  padding-block: 72px 76px;
  background: #102d2a;
  color: #f5faf8;
}

.section-heading {
  max-width: 850px;
  margin-bottom: 38px;
}

.section-heading h2 {
  margin-bottom: 0;
  font-size: 2.55rem;
}

.compact-heading {
  margin-bottom: 28px;
}

.featured-band .section-index {
  color: #7dd0c2;
}

.featured-media {
  margin: 0;
}

.featured-media video {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 2px;
  background: #081817;
  object-fit: cover;
}

.featured-media figcaption {
  margin-top: 12px;
  color: #b8c9c5;
  font-size: 0.84rem;
}

.featured-details {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.8fr);
  gap: 56px;
  align-items: end;
  margin-top: 38px;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.result-badge,
.paper-status {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 10px;
  border-radius: 3px;
  font-size: 0.76rem;
  font-weight: 750;
  line-height: 1.2;
}

.result-badge {
  background: var(--amber-soft);
  color: #5e3c0c;
}

.paper-status {
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: #d7e5e1;
}

.featured-summary h3 {
  margin-bottom: 8px;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 2.2rem;
}

.paper-subtitle {
  max-width: 720px;
  color: #d9e5e2;
  font-size: 1.1rem;
  font-weight: 650;
}

.featured-summary > p:not(.paper-subtitle):not(.role-line) {
  max-width: 760px;
  color: #c4d2cf;
}

.role-line {
  color: #f5faf8;
}

.paper-links a,
.paper-links span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding-block: 4px;
  color: inherit;
  font-size: 0.88rem;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: currentColor;
}

.paper-links span[aria-disabled="true"] {
  color: #93a8a3;
  text-decoration: none;
}

.featured-metrics {
  margin: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.25);
}

.featured-metrics div {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 18px;
  align-items: baseline;
  padding-block: 15px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.featured-metrics dt {
  color: #9fb4af;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.featured-metrics dd {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 750;
}

.directions {
  padding-block: 92px;
}

.direction-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.direction-grid article {
  min-width: 0;
  padding: 28px 30px 20px 0;
}

.direction-grid article + article {
  padding-left: 30px;
  border-left: 1px solid var(--line);
}

.direction-number {
  display: block;
  margin-bottom: 28px;
  color: var(--amber);
  font-size: 0.8rem;
  font-weight: 750;
}

.direction-grid h3 {
  min-height: 60px;
  margin-bottom: 14px;
  font-size: 1.18rem;
}

.direction-grid p {
  color: var(--muted);
  font-size: 0.95rem;
}

.direction-grid a,
.text-link {
  color: var(--teal-dark);
  font-size: 0.88rem;
  font-weight: 700;
}

.publications-band {
  padding-block: 86px 92px;
  background: var(--surface-soft);
  border-block: 1px solid var(--line);
}

.heading-with-link {
  max-width: none;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
}

.heading-with-link > div {
  max-width: 850px;
}

.publication-list {
  display: grid;
  gap: 18px;
}

.publication-card {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.55fr);
  min-height: 250px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.publication-card.flagship {
  grid-template-columns: minmax(320px, 0.95fr) minmax(0, 1.35fr);
}

.publication-visual {
  position: relative;
  min-height: 250px;
  overflow: hidden;
  border-right: 1px solid var(--line);
  background: #e6ebe8;
}

.publication-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.publication-visual.video-still img {
  object-position: center;
}

.publication-visual.research-figure {
  display: grid;
  place-items: center;
  padding: 20px;
  background: #f7f8f7;
}

.publication-visual.research-figure img {
  position: absolute;
  inset: 20px;
  width: calc(100% - 40px);
  height: calc(100% - 40px);
  object-fit: contain;
}

.publication-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  padding: 30px 34px;
}

.publication-copy h3 {
  max-width: 800px;
  margin-bottom: 14px;
  font-size: 1.3rem;
}

.publication-copy > p:not(.publication-meta):not(.publication-result) {
  max-width: 760px;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.96rem;
}

.publication-result {
  margin-bottom: 15px;
  color: #38433f;
  font-size: 0.9rem;
}

.publication-copy .paper-links {
  margin-top: auto;
  color: var(--teal-dark);
}

.profile-band {
  padding-block: 58px 64px;
  background: #e8edea;
  border-block: 1px solid var(--line);
}

.profile-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(420px, 0.95fr);
  gap: 72px;
  align-items: start;
}

.profile-band .section-heading {
  max-width: none;
}

.profile-band .section-heading h2 {
  font-size: 2rem;
}

.news-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid #cbd4d0;
}

.news-list li {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 20px;
  padding-block: 17px;
  border-bottom: 1px solid #cbd4d0;
}

.news-list time {
  color: var(--teal-dark);
  font-size: 0.8rem;
  font-weight: 700;
}

.news-list span {
  color: #38433f;
  font-size: 0.92rem;
}

.news-list li:first-child span {
  color: var(--ink);
  font-weight: 650;
}

.news-list a {
  color: var(--teal-dark);
  font-weight: 700;
}

.background-column {
  display: grid;
  gap: 30px;
  padding-left: 44px;
  border-left: 3px solid var(--amber);
}

.background-group + .background-group {
  padding-top: 28px;
  border-top: 1px solid #cbd4d0;
}

.background-group > h2 {
  margin-bottom: 18px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 1.05rem;
  font-weight: 750;
  line-height: 1.3;
}

.timeline-list {
  display: grid;
  gap: 22px;
}

.timeline-entry {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.timeline-logo {
  width: 72px;
  height: 52px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid #cbd4d0;
  border-radius: 4px;
  background: var(--surface);
  text-decoration: none;
}

.timeline-logo:hover {
  border-color: var(--teal);
}

.timeline-logo.naver-logo {
  border-color: #111;
  background: #111;
}

.naver-logo img {
  width: 52px;
  height: 52px;
  object-fit: cover;
}

.kaist-logo img {
  width: 62px;
  height: auto;
}

.timeline-copy {
  min-width: 0;
}

.timeline-copy h3 {
  margin-bottom: 3px;
  font-size: 0.98rem;
}

.timeline-copy h3 a,
.timeline-org a,
.timeline-detail a {
  text-decoration: none;
}

.timeline-copy h3 a:hover,
.timeline-org a:hover,
.timeline-detail a:hover {
  text-decoration: underline;
}

.timeline-copy p {
  margin-bottom: 2px;
}

.timeline-org,
.timeline-detail {
  color: #38433f;
  font-size: 0.88rem;
}

.timeline-date {
  color: var(--muted);
  font-size: 0.82rem;
}

.site-footer {
  padding-block: 22px;
  background: var(--ink);
  color: #bdc9c5;
}

.site-footer .section-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-footer p {
  margin: 0;
  font-size: 0.8rem;
}

.site-footer a {
  color: #e5efec;
  font-size: 0.8rem;
}

@media (max-width: 900px) {
  .intro h1 {
    font-size: 2.9rem;
  }

  .featured-details {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .direction-grid {
    grid-template-columns: 1fr;
  }

  .direction-grid article {
    padding: 24px 0;
    border-bottom: 1px solid var(--line);
  }

  .direction-grid article + article {
    padding-left: 0;
    border-left: 0;
  }

  .direction-grid h3 {
    min-height: 0;
  }

  .direction-number {
    margin-bottom: 12px;
  }

  .publication-card,
  .publication-card.flagship {
    grid-template-columns: minmax(220px, 0.7fr) minmax(0, 1.3fr);
  }

  .profile-grid {
    grid-template-columns: 1fr;
    gap: 46px;
  }

  .background-column {
    padding-top: 36px;
    padding-left: 0;
    border-top: 3px solid var(--amber);
    border-left: 0;
  }
}

@media (max-width: 680px) {
  .section-shell,
  .nav-shell {
    width: min(calc(100% - 32px), var(--max-width));
  }

  .nav-shell {
    min-height: 58px;
    align-items: center;
  }

  .nav-links {
    gap: 16px;
  }

  .nav-links a {
    font-size: 0.82rem;
  }

  .intro {
    padding-block: 48px 42px;
  }

  .identity-row {
    display: block;
  }

  .portrait {
    width: 110px;
    height: 147px;
    margin-bottom: 22px;
  }

  .intro h1 {
    font-size: 2.35rem;
  }

  .intro-text {
    font-size: 1rem;
  }

  .action-row {
    margin-top: 28px;
  }

  .action-link {
    min-height: 40px;
    padding-inline: 12px;
    font-size: 0.84rem;
  }

  .featured-band,
  .directions,
  .publications-band,
  .profile-band {
    padding-block: 62px;
  }

  .section-heading h2 {
    font-size: 2rem;
  }

  .featured-summary h3 {
    font-size: 1.85rem;
  }

  .featured-metrics div {
    grid-template-columns: 84px 1fr;
  }

  .heading-with-link {
    align-items: flex-start;
    flex-direction: column;
  }

  .publication-card,
  .publication-card.flagship {
    grid-template-columns: 1fr;
  }

  .publication-visual {
    min-height: 0;
    aspect-ratio: 16 / 9;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .publication-visual.research-figure {
    aspect-ratio: 4 / 3;
  }

  .publication-copy {
    padding: 26px 22px;
  }

  .publication-copy h3 {
    font-size: 1.14rem;
    overflow-wrap: anywhere;
  }

  .news-list li {
    grid-template-columns: 78px 1fr;
  }

  .timeline-entry {
    grid-template-columns: 60px minmax(0, 1fr);
    gap: 14px;
  }

  .timeline-logo {
    width: 60px;
    height: 48px;
  }

  .naver-logo img {
    width: 48px;
    height: 48px;
  }

  .kaist-logo img {
    width: 52px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-header,
  .featured-media video,
  .site-footer {
    display: none;
  }

  body {
    background: #fff;
  }

  .featured-band {
    background: #fff;
    color: #000;
  }
}