:root {
  --bg: #ffffff;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-strong: #ffffff;
  --text: #1f2933;
  --muted: #4e5966;
  --line: #c8d2dc;
  --accent: #0f766e;
  --accent-soft: #d9f3ef;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 20px 50px rgba(19, 31, 43, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: "Noto Sans CJK KR", "Noto Sans KR", "Noto Sans", sans-serif;
  line-height: 1.55;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.2;
}

p {
  margin: 0;
}

a {
  color: inherit;
}

.content-wrap {
  width: min(1080px, calc(100vw - 2.2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(200, 210, 220, 0.7);
  background: rgba(255, 255, 255, 0.97);
}

.site-header .content-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.brand {
  display: inline-block;
  color: var(--text);
  font-size: 0.93rem;
  font-weight: 500;
  text-decoration: none;
  letter-spacing: 0.01em;
}

.main-nav {
  display: flex;
  gap: 0.95rem;
  align-items: center;
  justify-content: flex-end;
}

.main-nav a {
  text-decoration: none;
  font-size: 0.93rem;
  color: var(--muted);
  padding: 0.32rem 0.6rem;
  border-radius: 999px;
  transition: background 180ms ease, color 180ms ease;
}

.main-nav a:hover,
.main-nav a:focus-visible,
.main-nav a.active {
  background: var(--accent-soft);
  color: var(--accent);
  outline: none;
}

.section {
  padding: 2.4rem 0 0.8rem;
  scroll-margin-top: 84px;
}

.hero {
  display: grid;
  gap: 2.2rem;
  grid-template-columns: minmax(0, 1.45fr) minmax(320px, 1fr);
  align-items: start;
  min-height: auto;
  padding-top: 1.2rem;
}

.eyebrow {
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.77rem;
  font-weight: 700;
}

#hero-location {
  display: none;
}

.hero h1 {
  margin-top: 0.45rem;
  font-size: clamp(2rem, 4.8vw, 3.2rem);
}

.role {
  margin-top: 0.85rem;
  font-family: "Noto Sans CJK KR", "Noto Sans KR", "Noto Sans", sans-serif;
  font-size: clamp(1.05rem, 2vw, 1.45rem);
  color: #213246;
}

.summary {
  margin-top: 1rem;
  max-width: 70ch;
  color: var(--muted);
  white-space: pre-line;
}

.social-links {
  margin-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  text-decoration: none;
  font-size: 0.86rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.42rem 0.78rem;
  background: #fff;
  transition: transform 180ms ease, border-color 180ms ease;
}

.social-links a:hover,
.social-links a:focus-visible {
  transform: translateY(-1px);
  border-color: var(--accent);
  outline: none;
}

.social-links a img {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  flex-shrink: 0;
}

.social-links a .social-emoji {
  width: 14px;
  height: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  line-height: 1;
  flex-shrink: 0;
}

.hero-photo-shell {
  position: relative;
  margin-top: 0.45rem;
  border-radius: 26px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
  width: min(100%, 184px);
  justify-self: end;
}

.hero-photo-shell img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  min-height: 168px;
}

h2 {
  font-size: clamp(1.45rem, 2.2vw, 2rem);
}

.section-note {
  margin-left: 0.35rem;
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--muted);
  white-space: nowrap;
}

#about p {
  margin-top: 1.1rem;
  max-width: 80ch;
  color: var(--muted);
}

.quick-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.1rem;
  list-style: none;
  padding: 0;
}

.quick-facts li {
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid var(--line);
  font-size: 0.82rem;
}

.section-head {
  margin-bottom: 1.2rem;
  padding-bottom: 0.55rem;
  border-bottom: 2px solid rgba(31, 41, 51, 0.18);
}

.subsection-block + .subsection-block {
  margin-top: 1.1rem;
}

.subsection-title {
  margin: 0 0 0.5rem;
  font-size: 1.17em;
  font-weight: 600;
  color: var(--text);
  line-height: 1.2;
}

.academic-line {
  margin: 0.08rem 0 0;
  font-size: 1rem;
  color: var(--text);
  line-height: 1.55;
}

.academic-list {
  margin: 0;
  padding-left: 1.1rem;
}

.academic-list .academic-line {
  margin-top: 0.08rem;
}

.academic-line a {
  color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

#contact h2 {
  padding-bottom: 0.55rem;
  border-bottom: 2px solid rgba(31, 41, 51, 0.18);
}

.education-list {
  display: grid;
  gap: 1rem;
}

.education-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  align-items: start;
}

.education-logo {
  display: none;
}

.education-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  padding: 0.25rem;
}

.education-logo-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 700;
  color: #415065;
  letter-spacing: 0.03em;
}

.education-school {
  margin: 0 0 0.5rem;
  font-size: 1.02rem;
  font-weight: 600;
}

.education-entries {
  margin: 0;
  padding-left: 1.1rem;
}

.education-entry + .education-entry {
  margin-top: 0.08rem;
}

.education-degree {
  margin: 0;
  font-size: 0.98rem;
  color: var(--text);
  font-weight: 500;
}

.timeline {
  border-left: 2px dashed #b8c7d5;
  padding-left: 1rem;
  display: grid;
  gap: 1rem;
}

.timeline-item {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1rem 0.95rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.55rem;
  top: 1.2rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.2);
}

.timeline-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem;
}

#experience .timeline-side {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.35rem;
}

#experience .timeline-side .meta {
  margin-top: 0;
}

#experience .experience-logo-slot {
  height: 1.2rem;
  width: auto;
  max-width: 96px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#experience .experience-logo-slot img {
  width: auto;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
}

#experience .experience-logo-fallback {
  font-size: 0.64rem;
  font-weight: 600;
  color: #5d6978;
  letter-spacing: 0.02em;
}

.timeline-item h3 {
  font-size: 1.08rem;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.3rem;
}

.timeline-item p {
  color: var(--muted);
  margin-top: 0.65rem;
}

.card-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.project-card,
.publication-card,
.talk-card,
.contact-card {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.project-card {
  padding: 1rem;
}

.project-card p {
  margin-top: 0.62rem;
  color: var(--muted);
}

.project-tags {
  margin: 0.8rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.project-tags li {
  font-size: 0.78rem;
  padding: 0.28rem 0.56rem;
  background: #f4faf9;
  color: #165c56;
  border-radius: 999px;
  border: 1px solid #ccece7;
}

.project-links {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.9rem;
}

.project-links a,
.pub-links a {
  font-size: 0.83rem;
  color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.publication-year {
  margin: 1.7rem 0 0.8rem;
  font-family: "Noto Sans CJK KR", "Noto Sans KR", "Noto Sans", sans-serif;
  color: #2d4258;
}

.publication-stack {
  display: grid;
  gap: 0;
}

.publication-card {
  padding: 1rem 0;
}

.publication-card .authors,
.publication-card .venue {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 0.5rem;
}

.pub-links {
  margin-top: 0.78rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

#publications .publication-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 212px;
  gap: 1.1rem;
  align-items: start;
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  border-bottom: 1px solid rgba(31, 41, 51, 0.12);
}

#publications .publication-body h4 {
  margin: 0;
  font-size: 1.06rem;
  line-height: 1.35;
}

#publications .publication-media {
  margin-top: 0;
  justify-self: end;
  width: 212px;
  height: 120px;
  border: 1px solid rgba(31, 41, 51, 0.15);
  border-radius: 8px;
  overflow: hidden;
  background: #f3f3f3;
  cursor: zoom-in;
}

#publications .publication-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
}

.image-lightbox {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(16, 24, 32, 0.72);
  z-index: 60;
  padding: 1.2rem;
}

.image-lightbox.open {
  display: flex;
}

.image-lightbox-frame {
  position: relative;
  width: min(92vw, 1100px);
  max-height: 88vh;
  background: #ffffff;
  border-radius: 12px;
  border: 1px solid rgba(31, 41, 51, 0.18);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.28);
  padding: 0.9rem;
}

.image-lightbox-image {
  display: block;
  width: 100%;
  max-height: calc(88vh - 4.8rem);
  object-fit: contain;
  object-position: center;
}

.image-lightbox-caption {
  margin: 0.55rem 0 0;
  font-size: 0.9rem;
  line-height: 1.4;
  color: #314454;
  text-align: center;
}

.image-lightbox-close {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  border: 1px solid rgba(31, 41, 51, 0.2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.95);
  color: #253544;
  width: 30px;
  height: 30px;
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1;
  padding: 0;
  cursor: pointer;
}

.image-lightbox-close:hover,
.image-lightbox-close:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

#publications .publication-media-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.86rem;
  font-weight: 600;
  color: #4e5966;
  background: linear-gradient(135deg, #f2f2f2, #e8e8e8);
}

.talks-list {
  display: grid;
  gap: 0.8rem;
}

.news-year {
  margin: 0 0 0.5rem;
  font-size: 1.02rem;
  font-weight: 600;
  color: #2d4258;
}

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

#news-list .academic-list + .news-year {
  margin-top: 1.1rem;
}

#news-list .academic-line {
  display: block;
}

#news-list .news-date {
  font-family: "JetBrains Mono", monospace;
  font-weight: 500;
}

.talk-card {
  padding: 1rem;
}

.talk-card .meta {
  margin-top: 0.45rem;
}

.contact-card {
  padding: 1.2rem;
}

.contact-card p {
  color: var(--muted);
  margin-top: 0.65rem;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  gap: 0.55rem;
}

.contact-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.contact-list strong {
  min-width: 80px;
}

/* Keep boxed style only for Publications and Talks & Activities */
#experience .timeline {
  border-left: none;
  padding-left: 0;
}

#experience .timeline-item {
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  padding: 0.2rem 0 0.9rem;
}

#experience .timeline-item::before {
  content: none;
}

#projects .card-grid {
  grid-template-columns: 1fr;
}

#projects .project-card {
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  padding: 0.1rem 0 0.9rem;
}

#projects .project-tags {
  margin-top: 0.45rem;
}

#awards .talk-card,
#academic-activities .talk-card,
#languages .talk-card,
#skills .talk-card,
#reviewer .talk-card {
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  padding: 0.1rem 0 0.8rem;
}

#skills .talk-card p {
  margin-top: 0.3rem;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.55;
}

#skills .talk-card h3 {
  font-size: 1rem;
  line-height: 1.35;
  font-weight: 600;
}

#skills-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 1.4rem;
  row-gap: 0.6rem;
}

#contact .contact-card {
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  padding: 0;
}

.site-footer {
  padding: 2rem 0 1.8rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  color: var(--muted);
  border-top: 1px solid rgba(200, 210, 220, 0.7);
  padding-top: 1.2rem;
  font-size: 0.9rem;
}

.reveal {
  opacity: 1;
  transform: none;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 930px) {
  .main-nav {
    gap: 0.5rem;
    overflow-x: auto;
    white-space: nowrap;
    padding-bottom: 0.2rem;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 2rem;
  }

  .hero-photo-shell {
    order: 0;
    justify-self: start;
    width: min(100%, 176px);
  }

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

  .section {
    padding-top: 2.2rem;
  }

  .education-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  #publications .publication-card {
    grid-template-columns: 1fr;
  }

  #publications .publication-media {
    justify-self: start;
    width: 184px;
    height: 106px;
  }
}

@media (max-width: 700px) {
  .site-header .content-wrap {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.7rem 0;
  }

  #skills-list {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .brand {
    margin-bottom: 0.5rem;
  }

  .main-nav {
    max-width: 74vw;
  }

  .content-wrap {
    width: min(1080px, calc(100vw - 1.2rem));
  }

  .footer-inner {
    flex-direction: column;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}