*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --ink: #1a1a1a;          /* 본문 글씨색 */
  --paper: #f6f3ee;        /* 배경색 */
  --accent: #8b3a3a;       /* 강조색 (붉은색) — 링크, 배지, 연도 등 */
  --accent-light: #c4756e; /* 연한 강조색 — 호버, 선택 시 */
  --muted: #6b6560;        /* 회색 텍스트 — 부가 정보 */
  --border: #d6d0c8;       /* 구분선 색 */
  --card: #faf8f5;         /* 카드/사이드바 배경 */
  --serif: 'Cormorant Garamond', 'Georgia', serif;
  --sans: 'DM Sans', 'Helvetica Neue', sans-serif;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent-light); color: #fff; }

a { color: var(--accent); }
a:hover { color: var(--accent-light); }

/* ── SITE NAV (상단 고정 메뉴 — 모든 페이지 공통) ── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246, 243, 238, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-nav .nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.6rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.site-nav .brand {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
}
.site-nav .brand:hover { color: var(--accent); }
.site-nav .brand img {
  height: 34px;   /* 인장 크기 — 이 값으로 조절 */
  width: auto;
  display: block;
  transition: opacity 0.2s;
}
.site-nav .brand:hover img { opacity: 0.75; }
.site-nav .nav-toggle {
  display: none; /* 데스크톱에서는 숨김 — 모바일에서만 표시 */
  background: none;
  border: none;
  font-size: 1.35rem;
  line-height: 1;
  color: var(--ink);
  cursor: pointer;
  padding: 0.3rem 0.4rem;
}
.site-nav .nav-links { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.site-nav .nav-links a {
  font-size: 0.78rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.3rem 0.7rem;
  transition: color 0.2s;
}
.site-nav .nav-links a:hover { color: var(--accent); }
.site-nav .nav-links a.active {
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}
.site-nav .nav-links a.nav-cv {
  color: #fff;
  background: var(--accent);
  border-radius: 2px;
}
.site-nav .nav-links a.nav-cv:hover { background: var(--accent-light); color: #fff; }

/* ── BACK TO TOP ── */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 90;
  width: 40px;
  height: 40px;
  background: var(--ink);
  color: var(--paper);
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 40px;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, background 0.2s;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { background: var(--accent); }

/* ── LAYOUT ── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }

/* ── PAGE HEADER (서브페이지 상단 제목) ── */
.page-header { padding: 3.5rem 0 1rem; }
.page-header h1 {
  font-family: var(--serif);
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.page-header p { font-size: 0.95rem; color: var(--muted); margin-top: 0.4rem; }

/* ── HERO ── */
.hero { padding: 4rem 0 4rem; position: relative; overflow: hidden; }
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 4rem;
  align-items: start;
}
.hero h1 {
  font-family: var(--serif);
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 0.3rem;
}
.hero h1 .han { color: var(--muted); font-size: 1.6rem; font-weight: 400; margin-left: 0.5rem; }
.hero .tagline {
  font-size: 1.05rem;
  color: var(--muted);
  margin-bottom: 1.8rem;
  line-height: 1.6;
}
.hero .tagline strong { color: var(--ink); font-weight: 600; }
.hero .graduating {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.35rem 0.9rem;
  border-radius: 2px;
  margin-bottom: 2rem;
}
.cv-button {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.55rem 1.4rem;
  background: var(--ink);
  color: var(--paper);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  border-radius: 2px;
  transition: background 0.2s;
}
.cv-button:hover { background: var(--accent); color: #fff; }

.sidebar-card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 1.8rem;
}
.sidebar-card h3 {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
.sidebar-card .field-list { list-style: none; }
.sidebar-card .field-list li { font-size: 0.88rem; padding: 0.3rem 0; color: var(--ink); }
.sidebar-card .field-list li::before {
  content: '';
  display: inline-block;
  width: 6px; height: 6px;
  background: var(--accent-light);
  border-radius: 50%;
  margin-right: 0.6rem;
  vertical-align: middle;
}
.contact-row { margin-top: 1.2rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.contact-row a {
  display: block;
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
  margin-bottom: 0.3rem;
  word-break: break-all;
}
.contact-row a:hover { text-decoration: underline; }
.contact-row .links { display: flex; gap: 1rem; margin-top: 0.6rem; }
.contact-row .links a {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── NEWS (홈 전용) ── */
.news-section { padding: 2.5rem 0 3rem; border-top: 1px solid var(--border); }
.news-list { list-style: none; max-width: 820px; }
.news-list li {
  display: grid;
  grid-template-columns: 110px 1fr; /* 왼쪽: 날짜(110px), 오른쪽: 소식 */
  gap: 1.2rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(0,0,0,0.05);
  font-size: 0.9rem;
}
.news-list li:last-child { border-bottom: none; }
.news-date {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--accent);
  font-size: 0.92rem;
}
.news-text { color: var(--ink); }
.news-text em { color: var(--ink); }
.news-text .tag {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.1rem 0.45rem;
  border-radius: 2px;
  background: #e8d5d5;
  color: var(--accent);
  margin-right: 0.45rem;
  vertical-align: middle;
}

/* ── RESEARCH PROFILE ── */
.profile-section { padding: 2.5rem 0 3rem; border-top: 1px solid var(--border); }
.profile-text {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.85;
  max-width: 820px;
}

/* ── SECTIONS ── */
section { padding: 4rem 0; border-top: 1px solid var(--border); }
section:last-of-type { padding-bottom: 6rem; }

.section-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2.5rem;
}
.section-header h2 {
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.section-header .line { flex: 1; height: 1px; background: var(--border); }
.section-header .count { font-size: 0.78rem; color: var(--muted); font-weight: 500; }
.section-header .more-link {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  white-space: nowrap;
}

/* ── EDUCATION ── */
.edu-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(0,0,0,0.04);
}
.edu-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.edu-date { font-size: 0.82rem; color: var(--muted); font-weight: 500; padding-top: 0.2rem; }
.edu-content h3 {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.edu-content p { font-size: 0.88rem; color: var(--muted); line-height: 1.6; }
.edu-content .thesis {
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
  margin-top: 0.4rem;
}

/* ── PUBLICATIONS ── */
.pub-item {
  margin-bottom: 1.6rem;
  padding-left: 1.2rem;
  border-left: 2px solid var(--border);
  transition: border-color 0.2s;
}
.pub-item:hover { border-left-color: var(--accent); }
.pub-badges { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 0.35rem; }
.badge {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
}
/* 배지 색상: q1=붉은, q2=회색, scie=파란, ssci=초록, first=진붉은, review=연한, oral=붉은, poster=회색 */
.badge.q1 { background: #e8d5d5; color: var(--accent); }
.badge.q2 { background: #e0ddd8; color: var(--muted); }
.badge.scie { background: #d5dde8; color: #3a5a8b; }
.badge.ssci { background: #dde8d5; color: #4a7a3a; }
.badge.first { background: var(--accent); color: #fff; }
.badge.review { background: #f0ebe4; color: var(--muted); }

.pub-text { font-size: 0.88rem; line-height: 1.65; color: var(--ink); }
.pub-text .authors { color: var(--muted); }
.pub-text .my-name { color: var(--ink); font-weight: 600; }
.pub-text .title { font-weight: 500; }
.pub-text .journal { font-style: italic; color: var(--ink); }
.doi { font-size: 0.8rem; color: var(--accent); text-decoration: none; }
.doi:hover { text-decoration: underline; }
.pub-text .note { font-size: 0.8rem; color: var(--muted); font-style: italic; }

.year-divider {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
  margin: 2.5rem 0 1.2rem;
  padding-bottom: 0.3rem;
}
.year-divider:first-child { margin-top: 0; }

/* ── PROCEEDINGS ── */
.proc-item { margin-bottom: 1.2rem; padding-left: 1.2rem; border-left: 2px solid rgba(0,0,0,0.06); }
.proc-item:hover { border-left-color: var(--accent-light); }
.proc-text { font-size: 0.85rem; line-height: 1.65; color: var(--ink); }
.proc-text .my-name { color: var(--ink); font-weight: 600; }

/* ── PRESENTATIONS ── */
.pres-grid { margin-bottom: 1.2rem; padding-left: 1.2rem; border-left: 2px solid rgba(0,0,0,0.06); }
.pres-grid:hover { border-left-color: var(--accent-light); }
.pres-badges { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 0.35rem; }
.badge.oral { background: #e8d5d5; color: var(--accent); }
.badge.poster { background: #dde0e5; color: #4a5568; }
.pres-text { font-size: 0.83rem; line-height: 1.6; color: var(--muted); }
.pres-text .my-name { color: var(--ink); font-weight: 600; }
.pres-award {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--accent);
  background: #f3e8e6;
  padding: 0.1rem 0.4rem;
  border-radius: 2px;
  margin-left: 0.3rem;
}

/* ── REPORTS ── */
.report-item {
  margin-bottom: 1.2rem;
  padding-left: 1.2rem;
  border-left: 2px solid var(--border);
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--ink);
}
.report-item:hover { border-left-color: var(--accent); }
.report-item .my-name { color: var(--ink); font-weight: 600; }

/* ── EXPERIENCE ── */
.exp-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(0,0,0,0.04);
}
.exp-item:last-child { border-bottom: none; }
.exp-date { font-size: 0.82rem; color: var(--muted); font-weight: 500; }
.exp-content h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.15rem; }
.exp-content .org { font-size: 0.88rem; color: var(--accent); margin-bottom: 0.4rem; }
.exp-content p { font-size: 0.85rem; color: var(--muted); line-height: 1.6; }
.exp-clients { font-size: 0.82rem; color: var(--muted); margin-top: 0.3rem; font-style: italic; }

/* ── PROJECTS ── */
.proj-group-title {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  margin-top: 2rem;
  color: var(--ink);
}
.proj-group-title:first-child { margin-top: 0; }

.proj-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
  padding: 0.8rem 1rem;
  background: var(--card);
  border: 1px solid transparent;
  transition: border-color 0.2s;
}
.proj-item:hover { border-color: var(--border); }
.proj-year { font-size: 0.82rem; color: var(--muted); font-weight: 500; }
.proj-role {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
}
.proj-name { font-size: 0.88rem; font-weight: 500; line-height: 1.5; }
.proj-funder { font-size: 0.8rem; color: var(--muted); margin-top: 0.2rem; }

/* ── CAMPAIGNS ── */
.campaign-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.8rem;
}
.campaign-item {
  font-size: 0.83rem;
  padding: 0.6rem 0.8rem;
  background: var(--card);
  border-left: 2px solid var(--border);
}
.campaign-item strong { font-weight: 600; color: var(--ink); }
.campaign-item span { color: var(--muted); display: block; font-size: 0.78rem; margin-top: 0.15rem; }

/* ── TEACHING ── */
.teach-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1.5rem;
  margin-bottom: 1.2rem;
}
.teach-date { font-size: 0.82rem; color: var(--muted); font-weight: 500; }
.teach-content h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.15rem; }
.teach-content p { font-size: 0.85rem; color: var(--muted); }

/* ── HONORS ── */
.honor-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 1rem;
  margin-bottom: 0.8rem;
  padding: 0.4rem 0;
}
.honor-year {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  text-align: right;
}
.honor-text { font-size: 0.88rem; color: var(--ink); line-height: 1.5; }
.honor-text .sub { display: block; font-size: 0.82rem; color: var(--muted); }

/* ── OTHER SECTIONS ── */
.other-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}
.other-block h3 {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--ink);
}
.other-list { list-style: none; }
.other-list li {
  font-size: 0.85rem;
  color: var(--muted);
  padding: 0.35rem 0;
  border-bottom: 1px solid rgba(0,0,0,0.04);
}

/* ── HERO PORTRAIT ── */
.hero-portrait {
  margin: 0 0 1.2rem;
  border: 1px solid var(--border);
  background: var(--card);
  padding: 0.5rem; /* 폴라로이드 느낌 여백 — 싫으면 0으로 */
}
.hero-portrait img { width: 100%; display: block; }

/* ── BEYOND RESEARCH ── */
.beyond-grid {
  display: grid;
  grid-template-columns: 1fr 360px; /* 오른쪽 사진 폭 */
  gap: 3rem;
  align-items: center;
}
.fact-item { margin-bottom: 1.8rem; }
.fact-item:last-child { margin-bottom: 0; }
.fact-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.2rem;
}
.fact-text { font-size: 0.92rem; color: var(--ink); line-height: 1.7; }
.beyond-photo { margin: 0; border: 1px solid var(--border); background: var(--card); padding: 0.5rem; }
.beyond-photo img { width: 100%; display: block; }
.beyond-photo figcaption {
  font-size: 0.78rem;
  color: var(--muted);
  font-style: italic;
  padding: 0.5rem 0.2rem 0.1rem;
}

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
}
footer .foot-nav { margin-bottom: 0.5rem; }
footer .foot-nav a {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  margin: 0 0.6rem;
}

/* ── MOBILE ── */
@media (max-width: 768px) {
  .site-nav .nav-inner {
    padding: 0.5rem 1.2rem;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .site-nav .brand img { height: 30px; }
  .site-nav .nav-toggle { display: block; }
  /* 메뉴는 기본 숨김 — 햄버거 누르면 아래로 펼쳐짐 */
  .site-nav .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 16px rgba(0,0,0,0.06);
    padding: 0.4rem 0 0.8rem;
  }
  .site-nav.open .nav-links { display: flex; }
  .site-nav .nav-links a {
    font-size: 0.8rem;
    padding: 0.7rem 1.4rem;
  }
  .site-nav .nav-links a.active {
    border-bottom: none;
    border-left: 3px solid var(--accent);
    background: rgba(139, 58, 58, 0.05);
  }
  .hero { padding: 2.5rem 0 3rem; }
  .hero-grid { grid-template-columns: 1fr; gap: 2rem; }
  .hero h1 { font-size: 2.2rem; }
  .page-header h1 { font-size: 2rem; }
  .container { padding: 0 1.2rem; }
  .edu-item, .exp-item, .teach-item { grid-template-columns: 1fr; gap: 0.3rem; }
  .honor-item { grid-template-columns: 60px 1fr; }
  .news-list li { grid-template-columns: 1fr; gap: 0.1rem; padding: 0.7rem 0; }
  .back-to-top { right: 1rem; bottom: 1rem; width: 36px; height: 36px; line-height: 36px; font-size: 1rem; }
  .proj-item { grid-template-columns: 1fr; }
  .beyond-grid { grid-template-columns: 1fr; gap: 1.5rem; }
}

/* ── ANIMATION ── */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .fade-in { opacity: 1; transform: none; transition: none; }
}