:root {
  --sidebar: 248px;
  --page-width: 980px;
  --ink: #181816;
  --muted: #6f706b;
  --line: #deded8;
  --paper: #fbfbf8;
  --surface: #ffffff;
  --nav: #121313;
  --nav-muted: #aaa9a2;
  --accent: #b83a2c;
  --link: #245f9e;
  --serif: "Crimson Pro", Georgia, serif;
  --sans: "Noto Sans KR", Arial, sans-serif;
  --mono: "JetBrains Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.75;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 20;
  width: var(--sidebar);
  padding: 2.25rem 1.8rem 1.7rem;
  display: flex;
  flex-direction: column;
  background: var(--nav);
  color: #fff;
}
.brand {
  color: #fff;
  font-family: var(--serif);
  font-size: 1.9rem;
  font-weight: 600;
  letter-spacing: -.01em;
  line-height: .9;
}
.brand:hover { text-decoration: none; }
.brand span { display: block; }
.brand-mark { color: #ec6b59; }
.site-nav { margin-top: 4rem; }
.site-nav ul { margin: 0; padding: 0; list-style: none; }
.site-nav li + li { margin-top: .45rem; }
.site-nav a {
  position: relative;
  display: block;
  padding: .6rem 0 .6rem 1rem;
  color: var(--nav-muted);
  font-family: var(--mono);
  font-size: 1rem;
  letter-spacing: .04em;
}
.site-nav a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: transparent;
  transform: translateY(-50%);
}
.site-nav a:hover,
.site-nav a[aria-current="page"] { color: #fff; text-decoration: none; }
.site-nav a[aria-current="page"]::before { background: #ec6b59; }
.site-nav .subnav {
  margin: .2rem 0 .65rem 1rem;
  padding-left: .7rem;
  border-left: 1px solid #373836;
}
.site-nav .subnav li + li { margin-top: 0; }
.site-nav .subnav a {
  padding: .34rem 0 .34rem .65rem;
  font-size: .72rem;
  line-height: 1.35;
  letter-spacing: 0;
}
.sidebar-meta {
  margin-top: auto;
  color: var(--nav-muted);
  font-size: .8rem;
  line-height: 1.7;
}
.sidebar-meta a { color: #d8d8d3; }

.menu-button {
  display: none;
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 40;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 50%;
  background: var(--nav);
  color: #fff;
  font-size: 1.15rem;
  cursor: pointer;
}
.nav-scrim { display: none; }

.page-shell { margin-left: var(--sidebar); min-height: 100vh; }
.page-content {
  width: min(calc(100% - 5rem), var(--page-width));
  margin: 0 auto;
  padding: 5rem 0 4rem;
}
.page-header { margin-bottom: 3.2rem; }
.eyebrow {
  margin: 0 0 .5rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}
h1, h2, h3 { margin-top: 0; }
h1, h2 { font-family: var(--serif); }
h1 {
  margin-bottom: .5rem;
  font-size: clamp(2.3rem, 5vw, 4rem);
  font-weight: 500;
  line-height: 1.05;
}
.page-description { max-width: 650px; margin: 0; color: var(--muted); }

.home-hero {
  min-height: 48vh;
  display: flex;
  align-items: flex-start;
  padding-top: clamp(3rem, 9vh, 6rem);
  border-bottom: 1px solid var(--line);
}
.hero-inner { width: 100%; }
.hero-ko {
  margin: 0 0 1.2rem;
  font-size: clamp(1.05rem, 1.7vw, 1.2rem);
  font-weight: 400;
  letter-spacing: -.02em;
}
.hero-title {
  max-width: 760px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.35rem, 4.8vw, 4.5rem);
  font-weight: 600;
  letter-spacing: -.045em;
  line-height: .92;
}
.hero-title span { display: block; }
.hero-title > span:first-child { white-space: nowrap; }
.hero-title .accent { display: inline; color: #ec6b59; }
.hero-univ {
  margin: 2rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.7vw, 1.2rem);
  letter-spacing: 0;
}
.hero-univ a { color: var(--muted); }
.hero-contact-separator { margin: 0 .65rem; color: var(--line); }
.home-intro {
  padding: 2.25rem 0 3rem;
  border-bottom: 1px solid var(--line);
}
.home-intro h2 {
  margin-bottom: 1.25rem;
  font-size: 1.8rem;
  font-weight: 600;
}
.home-tags {
  margin: 1.6rem 0 0;
  color: var(--accent);
  font-family: var(--mono);
  font-size: .76rem;
  line-height: 1.9;
}
.home-recruiting {
  margin: .8rem 0 0;
  color: var(--muted);
  font-size: .84rem;
  line-height: 1.7;
}

.section { padding: 3.5rem 0; border-bottom: 1px solid var(--line); }
.section:last-child { border-bottom: 0; }
.section-heading {
  margin-bottom: 1.6rem;
  font-size: 1.8rem;
  font-weight: 600;
}
.lead { max-width: 760px; font-size: 1rem; }
.lead p { margin: 0 0 1rem; }
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.research-card,
.member-card,
.professor-card {
  background: var(--surface);
  border: 1px solid var(--line);
}
.research-card { padding: 1.45rem; border-top: 3px solid var(--accent); }
.research-card h3 { margin-bottom: .45rem; font-family: var(--serif); font-size: 1.16rem; }
.research-card p { margin: 0; color: var(--muted); font-size: .84rem; }
.tag {
  display: inline-block;
  margin-top: .7rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: .64rem;
}

.notice-list { border-top: 1px solid var(--ink); }
.notice-item {
  position: relative;
  display: block;
  padding: .55rem 0 .55rem 1.25rem;
}
.notice-item::before {
  content: "·";
  position: absolute;
  left: 0;
  font-weight: 500;
}
.notice-date, .publication-label {
  color: var(--accent);
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .04em;
}
.notice-item p { margin: 0; font-size: .94rem; line-height: 1.55; }

.page-rule { height: 1px; margin: -1.7rem 0 2.5rem; background: var(--ink); }

.professor-card {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 2rem;
  padding: 1.7rem;
  border-top: 3px solid var(--accent);
}
.professor-photo {
  width: 150px;
  height: 150px;
  object-fit: cover;
  border-radius: 50%;
  border: 1px solid var(--line);
}
.professor-name { margin-bottom: .2rem; font-family: var(--serif); font-size: 1.6rem; }
.professor-role { margin: 0 0 .8rem; color: var(--muted); font-size: .82rem; }
.contact-list { display: grid; gap: .2rem; font-family: var(--mono); font-size: .72rem; }
.members-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.member-card { padding: .95rem 1.35rem 1rem; border-left: 3px solid var(--accent); }
.member-name { margin: 0 0 .2rem; font-family: var(--serif); font-size: 1.15rem; }
.member-role, .member-dept { color: var(--muted); font-size: .76rem; }
.member-email {
  margin-top: .12rem;
  color: var(--link);
  font-family: var(--mono);
  font-size: .67rem;
  line-height: 1.45;
  overflow-wrap: anywhere;
}
.member-topic { margin-top: .35rem; font-family: var(--mono); font-size: .7rem; }
.recruiting {
  margin-top: 1.5rem;
  padding: 1.2rem 1.4rem;
  border: 1px dashed #b9b9b2;
  color: var(--muted);
  font-size: .84rem;
}
.member-category-list { display: grid; gap: .75rem; }
.member-category-link {
  display: block;
  padding: 1rem 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.8rem;
  font-weight: 600;
}
.member-category-link:hover { color: var(--accent); text-decoration: none; }

.publication-section { padding: 1.65rem 0; border-top: 1px solid var(--ink); }
.publication-section + .publication-section { margin-top: .35rem; }
.publication-section-header {
  margin-bottom: .35rem;
}
.publication-list { margin-left: 0; }
.publication-item { padding: 1rem 0; border-bottom: 1px solid var(--line); font-size: .9rem; }
.publication-item:last-child { border-bottom: 0; }
.publication-item em { color: var(--muted); }

.site-footer {
  width: min(calc(100% - 5rem), var(--page-width));
  margin: 0 auto;
  padding: 2rem 0;
  color: var(--muted);
  font-size: .7rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .45rem;
}
.site-footer a { color: var(--muted); }

@media (max-width: 900px) {
  .menu-button { display: block; }
  .sidebar { transform: translateX(-100%); transition: transform .25s ease; }
  body.nav-open .sidebar { transform: translateX(0); }
  .nav-scrim {
    position: fixed;
    inset: 0;
    z-index: 15;
    background: rgba(0,0,0,.38);
  }
  body.nav-open .nav-scrim { display: block; }
  .page-shell { margin-left: 0; }
  .page-content { width: min(calc(100% - 2.5rem), var(--page-width)); padding-top: 5rem; }
  .site-footer { width: calc(100% - 2.5rem); }
}

@media (max-width: 640px) {
  .home-hero { min-height: 62vh; }
  .hero-title > span:first-child { white-space: normal; }
  .hero-univ { display: flex; flex-direction: column; gap: .2rem; }
  .hero-contact-separator { display: none; }
  .research-grid, .members-grid { grid-template-columns: 1fr; }
  .publication-list { margin-left: 0; }
  .professor-card { grid-template-columns: 1fr; }
  .professor-photo { width: 120px; height: 120px; }
}