/* ===========================================================
   정헌주 교수 개인 홈페이지 스타일시트
   - 색상: 사진(네이비 재킷)과 어울리는 딥네이비를 포인트 색으로 사용
   - 다국어(한/영) 전환: [data-lang] 속성에 따라 .lang-ko / .lang-en 블록을
     보이거나 숨김 (자세한 로직은 js/main.js 참고)
   =========================================================== */

:root {
  --navy: #1c3555;
  --navy-dark: #12233a;
  --navy-light: #2f5384;
  --gold: #b8894f;
  --bg: #fafaf8;
  --bg-alt: #f2f0ec;
  --surface: #ffffff;
  --text: #1c1c1a;
  --text-muted: #5b5b56;
  --border: #e4e1d9;
  --radius: 10px;
  --max-width: 960px;
  --font-sans: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Malgun Gothic', sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}

/* 언어 전환: html의 data-lang 값에 따라 한쪽 언어 블록을 숨깁니다.
   기본값은 "ko"(한국어)이며, js/main.js가 버튼 클릭 시 이 값을 바꿉니다. */
[data-lang="ko"] .lang-en { display: none; }
[data-lang="en"] .lang-ko { display: none; }

img { max-width: 100%; display: block; }

a { color: var(--navy-light); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- 헤더/내비게이션 ---------- */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--navy-dark);
  white-space: nowrap;
}

nav.main-nav {
  display: flex;
  gap: 1.4rem;
  flex-wrap: wrap;
}

nav.main-nav a {
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
}

nav.main-nav a:hover { color: var(--navy); text-decoration: none; }

#lang-toggle {
  border: 1px solid var(--navy);
  color: var(--navy);
  background: transparent;
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}
#lang-toggle:hover { background: var(--navy); color: #fff; }

/* ---------- 히어로(소개) ---------- */
.hero {
  background: linear-gradient(160deg, var(--navy-dark) 0%, var(--navy) 55%, var(--navy-light) 100%);
  color: #fff;
  padding: 3.2rem 0 3.6rem;
}

.hero-inner {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.4rem;
  align-items: center;
}

.hero-photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid rgba(255,255,255,0.25);
  box-shadow: 0 12px 30px rgba(0,0,0,0.25);
}
.hero-photo img { width: 100%; height: 100%; object-fit: cover; }

.hero-name { font-size: 2rem; font-weight: 800; margin: 0 0 0.2rem; }
.hero-title { font-size: 1.05rem; opacity: 0.9; margin: 0 0 1rem; }
.hero-bio { font-size: 0.98rem; opacity: 0.95; max-width: 62ch; margin: 0 0 1.2rem; }

.hero-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.3rem; }
.tag {
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.28);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  font-size: 0.82rem;
}

.hero-links { display: flex; gap: 0.8rem; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9rem;
  border: 1px solid transparent;
}
.btn-primary { background: #fff; color: var(--navy-dark); }
.btn-primary:hover { background: var(--gold); color: #fff; text-decoration: none; }
.btn-outline { border-color: rgba(255,255,255,0.6); color: #fff; }
.btn-outline:hover { background: rgba(255,255,255,0.15); text-decoration: none; }

/* ---------- 공통 섹션 ---------- */
section.section { padding: 3rem 0; border-bottom: 1px solid var(--border); }
section.section:last-of-type { border-bottom: none; }
section.section.alt { background: var(--bg-alt); }

.section-head { margin-bottom: 1.8rem; }
.section-head .eyebrow {
  color: var(--gold);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.section-head h2 { margin: 0.25rem 0 0; font-size: 1.6rem; color: var(--navy-dark); }
.section-head p.lead { color: var(--text-muted); margin: 0.5rem 0 0; max-width: 68ch; }

/* ---------- 카드/타임라인 ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.3rem 1.5rem;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }

.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li {
  position: relative;
  padding: 0 0 1.1rem 1.3rem;
  border-left: 2px solid var(--border);
}
.timeline li:last-child { border-left-color: transparent; padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 0.3rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--navy);
}
.timeline .t-period { font-size: 0.82rem; color: var(--gold); font-weight: 700; }
.timeline .t-title { font-weight: 600; margin: 0.1rem 0; }
.timeline .t-desc { color: var(--text-muted); font-size: 0.92rem; }

/* ---------- 위원회/역할 배지 목록 ---------- */
ul.role-list { list-style: none; margin: 0; padding: 0; }
ul.role-list li {
  padding: 0.45rem 0;
  border-bottom: 1px dashed var(--border);
  font-size: 0.95rem;
}
ul.role-list li:last-child { border-bottom: none; }

/* ---------- 연구과제 테이블 ---------- */
.project-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.project-table th, .project-table td {
  text-align: left;
  padding: 0.6rem 0.7rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.project-table th {
  color: var(--navy-dark);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.project-table td.year { color: var(--gold); font-weight: 700; white-space: nowrap; }
.table-scroll { overflow-x: auto; }

/* ---------- 논문/출판 ---------- */
.pub-highlight-list { list-style: none; margin: 0 0 2rem; padding: 0; display: grid; gap: 0.7rem; }
.pub-highlight-list li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--gold);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.94rem;
}
.badge-ssci {
  display: inline-block;
  background: var(--navy);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.12rem 0.5rem;
  border-radius: 999px;
  margin-right: 0.4rem;
  vertical-align: middle;
}

details.pub-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.8rem;
  padding: 0.9rem 1.2rem;
}
details.pub-group summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--navy-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
details.pub-group summary .count {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.85rem;
}
details.pub-group ol { margin: 0.9rem 0 0.2rem; padding-left: 1.2rem; }
details.pub-group li { margin-bottom: 0.55rem; font-size: 0.92rem; }
details.pub-group li .venue { color: var(--text-muted); }

/* ---------- 미디어 보도 ---------- */
#media-feed { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.7rem; }
#media-feed li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.8rem 1rem;
}
#media-feed .m-title { font-weight: 600; }
#media-feed .m-meta { font-size: 0.82rem; color: var(--text-muted); margin-top: 0.2rem; }
.media-status { color: var(--text-muted); font-size: 0.92rem; }
.media-note {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--border);
  padding-top: 0.8rem;
}

/* ---------- 연락처 ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.contact-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.3rem;
}
.contact-item .label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gold);
  font-weight: 700;
}
.contact-item .value { margin-top: 0.3rem; font-weight: 600; }

/* ---------- 푸터 ---------- */
footer.site-footer {
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ---------- 반응형 ---------- */
@media (max-width: 720px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-photo { margin: 0 auto; }
  .hero-tags, .hero-links { justify-content: center; }
  .grid-2 { grid-template-columns: 1fr; }
  nav.main-nav { gap: 0.9rem; }
  .section-head h2 { font-size: 1.35rem; }
}