/* ============================================================
   CILAB — Modern Minimal Theme
   포인트 컬러 등은 아래 :root 변수만 바꾸면 전체에 적용됩니다.
   ============================================================ */
:root {
  --accent: #1f4e8c;          /* 포인트 컬러 (진한 블루) */
  --accent-soft: #eaf1fa;     /* 포인트 연한 배경 */
  --text: #1a1d21;            /* 본문 텍스트 */
  --text-muted: #5b636e;      /* 보조 텍스트 */
  --line: #e6e8ec;            /* 구분선 */
  --bg: #ffffff;
  --bg-alt: #f7f8fa;          /* 섹션 교차 배경 */
  --radius: 12px;
  --maxw: 1080px;
  --shadow: 0 1px 3px rgba(16,24,40,.06), 0 8px 24px rgba(16,24,40,.05);
  --font: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI",
          "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.main { min-height: 60vh; }

/* ── 헤더 / 네비게이션 ─────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 66px;
}
.brand { display: flex; flex-direction: column; line-height: 1.15; }
.brand:hover { text-decoration: none; }
.brand-mark { font-weight: 800; font-size: 20px; letter-spacing: .5px; color: var(--text); }
.brand-sub { font-size: 11px; color: var(--text-muted); letter-spacing: .3px; }

.header-right { display: flex; align-items: center; }
.nav-divider { width: 1px; height: 20px; background: var(--line); margin: 0 10px; }
.nav-github {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 8px; border-radius: 8px; color: var(--text);
  transition: background .15s, color .15s;
}
.nav-github:hover { background: var(--bg-alt); color: var(--accent); text-decoration: none; }
.nav-github svg { width: 18px; height: 18px; display: block; }

.nav-links { display: flex; gap: 6px; }
.nav-links a {
  color: var(--text); font-size: 15px; font-weight: 500;
  padding: 8px 14px; border-radius: 8px; transition: background .15s, color .15s;
}
.nav-links a:hover { background: var(--bg-alt); text-decoration: none; }
.nav-links a.active { color: var(--accent); background: var(--accent-soft); }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px; background: var(--text);
  border-radius: 2px; transition: transform .25s, opacity .2s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── 공통 섹션 / 타이포 ────────────────────────── */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }
.page-head { padding: 56px 0 8px; }
.page-head h1 { font-size: 34px; margin: 0 0 6px; letter-spacing: -.5px; }
.page-head .lead { color: var(--text-muted); font-size: 17px; margin: 0; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 1px;
  text-transform: uppercase; color: var(--accent); margin-bottom: 10px;
}
h2.section-title { font-size: 26px; margin: 0 0 28px; letter-spacing: -.3px; }

/* ── Hero (홈) ─────────────────────────────────── */
.hero {
  padding: 96px 0 80px;
  background:
    radial-gradient(60% 120% at 80% -10%, var(--accent-soft), transparent 60%),
    var(--bg);
}
.hero h1 {
  font-size: clamp(30px, 5vw, 50px); line-height: 1.18;
  letter-spacing: -1px; margin: 0 0 20px;
  word-break: keep-all;   /* 한글이 단어 중간에서 끊기지 않도록 */
}
.hero p { font-size: 18px; color: var(--text-muted); margin: 0 0 32px; word-break: keep-all; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tag {
  font-size: 14px; font-weight: 500; padding: 7px 16px; border-radius: 999px;
  background: var(--bg); border: 1px solid var(--line); color: var(--text);
}
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 10px; font-weight: 600; font-size: 15px;
  transition: transform .12s, box-shadow .15s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: var(--shadow); }
.btn-ghost { background: var(--bg); color: var(--text); border: 1px solid var(--line); }

/* ── 카드 그리드 ──────────────────────────────── */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px;
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #d3d8e0; }
.card .icon { font-size: 32px; margin-bottom: 14px; }
.card h3 { margin: 0 0 4px; font-size: 19px; }
.card .card-sub { color: var(--text-muted); font-size: 13px; margin: 0 0 12px; }
.card p { margin: 0; color: var(--text-muted); font-size: 15px; }
.card-link { display: block; color: var(--text); }
.card-link:hover { text-decoration: none; }
.card-link .card-more {
  display: inline-block; margin-top: 14px;
  color: var(--accent); font-weight: 600; font-size: 14px;
}

/* ── Research 상세 섹션 ───────────────────────── */
.research-detail { padding: 40px 0; scroll-margin-top: 90px; }
.research-detail + .research-detail { border-top: 1px solid var(--line); }
.research-detail h2 { font-size: 24px; margin: 0 0 18px; letter-spacing: -.3px; }
.research-detail p { margin: 0 0 14px; word-break: keep-all; }
.research-fig {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px; margin: 8px 0 22px;
}
.research-fig img { width: 100%; max-width: 760px; margin: 0 auto; }
.keyword-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.keyword-tag {
  font-size: 13px; font-weight: 600; padding: 5px 14px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
}

/* ── News (소식) ─────────────────────────────── */
.news-item {
  display: flex; gap: 14px; align-items: baseline;
  padding: 14px 0; border-bottom: 1px solid var(--line);
}
.news-date {
  flex-shrink: 0; min-width: 88px;
  font-size: 13.5px; font-weight: 700; color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.news-badge {
  flex-shrink: 0; font-size: 12px; font-weight: 600;
  padding: 3px 10px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent); white-space: nowrap;
}
.news-text { margin: 0; word-break: keep-all; font-weight: 600; font-size: 16.5px; }
.news-note { margin: 4px 0 0; font-size: 13.5px; color: var(--text-muted); word-break: keep-all; }

/* ── People (멤버) ────────────────────────────── */
.group-title {
  font-size: 15px; font-weight: 700; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 1px;
  margin: 40px 0 18px; padding-bottom: 8px; border-bottom: 1px solid var(--line);
}
.member {
  display: flex; flex-direction: column; align-items: flex-start;
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 24px;
}
.avatar-fallback {
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-weight: 700; background: var(--accent-soft); color: var(--accent);
}
.member .avatar-fallback { width: 64px; height: 64px; font-size: 24px; margin-bottom: 14px; }
.avatar-c0 { background: #eaf1fa; color: #1f4e8c; }  /* 블루 (포인트 컬러) */
.avatar-c1 { background: #e6f4ea; color: #2f7d4f; }  /* 그린 */
.avatar-c2 { background: #fdf3e3; color: #a96b1f; }  /* 앰버 */
.avatar-c3 { background: #f0ecfa; color: #6d4fc1; }  /* 퍼플 */
.avatar-c4 { background: #e5f4f4; color: #237a7a; }  /* 틸 */
.member .m-name { font-weight: 700; font-size: 17px; }
.member .m-name-en { color: var(--text-muted); font-size: 13px; }
.member .m-interest { color: var(--text-muted); font-size: 13px; margin-top: 8px; }
.member .m-email { font-size: 13px; margin-top: 6px; }

/* PI (교수) 강조 카드 */
.pi-card {
  display: flex; gap: 32px; align-items: center;
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow);
}
.pi-card .avatar {
  width: 150px; height: auto; flex-shrink: 0; margin: 0;
  border-radius: var(--radius); border: 1px solid var(--line);
}
.pi-card .avatar-fallback {
  width: 150px; height: 150px; flex-shrink: 0; margin: 0; font-size: 48px;
}
.pi-info h3 { margin: 0 0 4px; font-size: 24px; }
.pi-info .pi-en { color: var(--text-muted); margin: 0 0 10px; }
.pi-info .pi-title { color: var(--accent); font-weight: 600; }

/* PI 상세 (연구분야·링크·학력·경력) */
.head-en { font-size: .55em; font-weight: 500; color: var(--text-muted); margin-left: 8px; }
.pi-name-link { color: var(--text); }
.pi-name-link:hover { color: var(--accent); text-decoration: none; }
.pi-more { margin-top: 12px; font-size: 14.5px; font-weight: 600; }
.pi-bio {
  margin-top: 20px; padding: 24px 28px;
  background: var(--bg-alt); border-radius: var(--radius);
  word-break: keep-all;
}
.pi-bio p { margin: 0 0 10px; }
.pi-bio p:last-child { margin-bottom: 0; }
.pi-block-wide { margin-top: 20px; }
.pi-interests { font-size: 14.5px; color: var(--text-muted); margin-top: 10px; word-break: keep-all; }
.pi-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.pi-link {
  font-size: 13px; font-weight: 600; padding: 5px 14px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
}
.pi-link:hover { text-decoration: none; background: var(--accent); color: #fff; }
.pi-details {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px;
}
.pi-block {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px 28px;
}
.pi-block h4 {
  margin: 0 0 14px; font-size: 15px; color: var(--accent);
  text-transform: uppercase; letter-spacing: .5px;
}
.pi-block ul { list-style: none; margin: 0; padding: 0; }
.pi-block li {
  padding: 10px 0; border-bottom: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 2px;
}
.pi-block li:last-child { border-bottom: none; padding-bottom: 0; }
.pi-block .d-title { font-size: 15px; font-weight: 700; }
.pi-block .d-org { font-size: 14.5px; word-break: keep-all; }
.pi-block .d-period { font-size: 13px; color: var(--text-muted); }

/* ── Publications ─────────────────────────────── */
.pub-year { font-size: 22px; font-weight: 800; margin: 36px 0 16px; color: var(--accent); }
.pub-item {
  padding: 18px 0; border-bottom: 1px solid var(--line);
}
.pub-item:last-child { border-bottom: none; }
.pub-title { font-weight: 600; font-size: 16.5px; margin: 0 0 4px; }
.pub-authors { color: var(--text-muted); font-size: 14px; margin: 0 0 3px; }
.pub-venue { font-size: 14px; margin: 0; }
.pub-venue .venue-name { font-style: italic; }
.pub-badge {
  display: inline-block; font-size: 11px; font-weight: 700; color: var(--accent);
  background: var(--accent-soft); padding: 2px 9px; border-radius: 6px; margin-left: 6px;
  vertical-align: middle;
}

/* ── Projects ─────────────────────────────────── */
.proj-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; margin-bottom: 4px;
}
.proj-head h3 { margin: 0; font-size: 19px; }
.proj-head .keyword-tag { flex-shrink: 0; }

/* ── Contact ──────────────────────────────────── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.info-row { display: flex; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.info-row:last-child { border-bottom: none; }
.info-row .k { font-weight: 700; min-width: 72px; }
.map-embed { border: 0; width: 100%; height: 320px; border-radius: var(--radius); }

/* ── 푸터 ─────────────────────────────────────── */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-alt); margin-top: 40px; }
.footer-inner { padding: 40px 0; display: flex; flex-direction: column; gap: 12px; }
.footer-brand { display: flex; flex-direction: column; }
.footer-brand strong { font-size: 16px; }
.footer-brand span { color: var(--text-muted); font-size: 14px; }
.footer-contact { display: flex; flex-direction: column; gap: 3px; color: var(--text-muted); font-size: 14px; }
.footer-copy { color: var(--text-muted); font-size: 13px; margin-top: 6px; }

/* ── 반응형 (모바일) ──────────────────────────── */
@media (max-width: 860px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .pi-card { flex-direction: column; text-align: center; }
  .pi-card .pi-links { justify-content: center; }
  .pi-details { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .nav-divider { display: none; }
  .nav-links {
    position: absolute; top: 66px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    padding: 8px 16px 16px;
    max-height: 0; overflow: hidden; opacity: 0;
    transition: max-height .28s ease, opacity .2s ease;
  }
  .nav-links.open { max-height: 480px; opacity: 1; }
  .nav-links a { padding: 12px 8px; border-radius: 8px; }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .news-item { flex-wrap: wrap; row-gap: 4px; }
  .news-body { flex-basis: 100%; }
  .section { padding: 52px 0; }
  .hero { padding: 64px 0 56px; }
  .page-head { padding: 40px 0 4px; }
  .page-head h1 { font-size: 28px; }
}