/* hyuntak03.github.io */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --ink: #1f2328;
  --ink-soft: #57606a;
  --ink-faint: #8b949e;
  --line: #d8dee4;
  --line-soft: #e8ecf0;
  --link: #14508a;
  --link-hover: #0f3f6e;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 72px;
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; text-underline-offset: 2px; }

:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; border-radius: 3px; }

img { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; }
sup { font-size: .7em; line-height: 0; vertical-align: baseline; position: relative; top: -.45em; }
strong { font-weight: 600; }
h1, h2, h3, h4 { color: var(--ink); }

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.skip {
  position: absolute;
  left: 12px;
  top: -48px;
  padding: 6px 10px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  z-index: 200;
}
.skip:focus { top: 12px; }

/* ---------- navbar ---------- */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-soft);
}
.navbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.nav-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}
.nav-name:hover { text-decoration: none; color: var(--link); }
.nav-links { display: flex; gap: 2px; }
.nav-links a {
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 15px;
  color: var(--ink-soft);
}
.nav-links a:hover { color: var(--ink); background: var(--bg-soft); text-decoration: none; }
.nav-links a.active { color: var(--ink); background: var(--bg-soft); }

/* ---------- hero ---------- */

.hero { border-bottom: 1px solid var(--line-soft); }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 56px;
  padding-top: 64px;
  padding-bottom: 56px;
}
.hero-name {
  margin: 0 0 12px;
  font-size: 44px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.02em;
}
.hero-role {
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.hero-tagline {
  margin: 0 0 24px;
  max-width: 620px;
  font-size: 17px;
  color: var(--ink-soft);
}
.hero-tagline strong { color: var(--ink); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 8px; }

.hero-photo { margin: 0; }
.hero-photo img {
  width: 220px;
  height: 220px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.3;
  cursor: pointer;
  transition: background .12s, border-color .12s, color .12s;
}
.btn:hover { background: var(--bg-soft); border-color: #c4ccd4; text-decoration: none; color: var(--ink); }
.btn-primary { background: var(--link); border-color: var(--link); color: #fff; }
.btn-primary:hover { background: var(--link-hover); border-color: var(--link-hover); color: #fff; }
.btn .ico { width: 16px; height: 16px; flex-shrink: 0; }
.btn-sm { padding: 5px 11px; font-size: 13.5px; }
.btn-sm[aria-expanded="true"] { background: var(--bg-soft); border-color: #c4ccd4; }

/* ---------- sections ---------- */

.section { padding: 56px 0 8px; }
.section-title {
  margin: 0 0 24px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -.01em;
}
.sub-title,
.pub-group {
  margin: 40px 0 14px;
  font-size: 17px;
  font-weight: 600;
}
.sub-title { margin-top: 44px; }

/* ---------- about ---------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}
.about-bio p { margin: 0 0 1em; font-size: 16.5px; }
.about-bio p:last-child { margin-bottom: 0; }

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 18px;
}
.card + .card { margin-top: 14px; }
.card-title { margin: 0 0 10px; font-size: 15px; font-weight: 600; }
.tl-group {
  margin: 12px 0 6px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-faint);
}
.card-title + .tl-group { margin-top: 0; }
.timeline { margin: 0; padding: 0; list-style: none; }
.timeline li {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 10px;
  margin-bottom: 10px;
}
.timeline li:last-child { margin-bottom: 0; }
.tl-date { font-size: 13px; color: var(--ink-soft); white-space: nowrap; padding-top: 1px; }
.tl-title { display: block; font-size: 15px; font-weight: 500; line-height: 1.4; }
.tl-meta { display: block; font-size: 13.5px; color: var(--ink-soft); line-height: 1.5; }

.ri-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}
.ri-card { padding: 0 0 0 16px; border-left: 2px solid var(--line); }
.ri-card h4 { margin: 0 0 6px; font-size: 16px; font-weight: 600; }
.ri-card p { margin: 0; font-size: 15px; line-height: 1.55; color: var(--ink-soft); }

/* ---------- news ---------- */

.news-list { margin: 0; padding: 0; list-style: none; }
.news-item {
  display: flex;
  gap: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}
.news-item:last-child { border-bottom: 0; }
.news-date {
  flex-shrink: 0;
  width: 72px;
  padding-top: 2px;
  font-size: 14px;
  color: var(--ink-soft);
}
.news-body h3 { margin: 0 0 4px; font-size: 16px; font-weight: 600; }
.news-body h3 .tag { margin-left: 8px; vertical-align: 1px; }
.news-body p { margin: 0; font-size: 15px; color: var(--ink-soft); }

.tag {
  display: inline-block;
  padding: 1px 7px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg-soft);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-soft);
  line-height: 1.5;
  vertical-align: middle;
}

/* ---------- publications ---------- */

.pub-note { margin: 12px 0 0; font-size: 13.5px; color: var(--ink-faint); }

.pub-card {
  display: flex;
  gap: 26px;
  align-items: flex-start;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.pub-card + .pub-card { border-top: 0; }
.pub-thumb { flex-shrink: 0; width: 320px; }
.pub-thumb img {
  width: 100%;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: #fff;
}
.pub-content { min-width: 0; flex: 1; }
.pub-title {
  margin: 2px 0 6px;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.35;
}
.pub-title a { color: var(--ink); }
.pub-title a:hover { color: var(--link); text-decoration: none; }
.pub-authors { margin: 0 0 4px; font-size: 15px; color: var(--ink-soft); }
.pub-authors strong { color: var(--ink); }
.pub-venue { margin: 0 0 12px; font-size: 15px; color: var(--ink-soft); font-style: italic; }
.pub-links { display: flex; flex-wrap: wrap; gap: 6px; }

.fold { margin-top: 14px; }
.fold[hidden] { display: none; }
.abstract p {
  margin: 0;
  padding: 12px 16px;
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-soft);
}
.bib { position: relative; }
.bib pre {
  margin: 0;
  padding: 12px 14px;
  overflow-x: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.copy {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 3px 9px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 12.5px;
  color: var(--ink-soft);
  cursor: pointer;
}
.copy:hover { color: var(--ink); border-color: #c4ccd4; }
.copy[data-done] { color: var(--link); border-color: var(--link); }

/* ---------- contact / footer ---------- */

.contact p { margin: 0 0 .6em; font-size: 16.5px; max-width: 680px; }
.contact p:last-child { margin-bottom: 0; }

.site-footer {
  margin-top: 56px;
  padding: 20px 0 36px;
  border-top: 1px solid var(--line-soft);
}
.site-footer p { margin: 0; font-size: 13.5px; color: var(--ink-faint); }

/* ---------- back to top ---------- */

.to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--ink-soft);
  cursor: pointer;
  opacity: 0;
  transition: opacity .2s, background .12s;
  z-index: 90;
}
.to-top[hidden] { display: none; }
.to-top.show { opacity: 1; }
.to-top:hover { background: var(--bg-soft); color: var(--ink); }

/* ---------- reveal on scroll ---------- */

.reveal { opacity: 0; transform: translateY(8px); transition: opacity .4s ease, transform .4s ease; }
.reveal.visible { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { transition: none !important; }
}

/* ---------- responsive ---------- */

@media (max-width: 960px) {
  .hero-grid { gap: 36px; }
  .hero-name { font-size: 38px; }
  .hero-photo img { width: 180px; height: 180px; }
  .about-grid { grid-template-columns: 1fr; gap: 28px; }
  .ri-grid { grid-template-columns: 1fr; gap: 18px; }
  .pub-card { flex-direction: column; }
  .pub-thumb { width: 100%; max-width: 480px; }
}

@media (max-width: 720px) {
  .navbar .wrap { height: auto; padding-top: 8px; padding-bottom: 8px; flex-wrap: wrap; gap: 4px 10px; }
  .nav-links { flex-wrap: wrap; }
  .nav-links a { padding: 5px 9px; font-size: 14px; }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 36px;
    padding-bottom: 36px;
  }
  .hero-photo { order: -1; }
  .hero-photo img { width: 140px; height: 140px; }
  .hero-name { font-size: 34px; }
  .hero-role, .hero-tagline { font-size: 16px; }
  .section { padding-top: 44px; }
  .section-title { font-size: 23px; }
  .news-item { flex-direction: column; gap: 4px; }
  .news-date { width: auto; padding-top: 0; font-size: 13.5px; }
  .to-top { right: 14px; bottom: 14px; }
}

@media print {
  .navbar, .to-top, .skip, .copy { display: none; }
  .reveal { opacity: 1; transform: none; }
  .fold[hidden] { display: none; }
}