@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

:root {
  --clr-bg: #0a0e1a;
  --clr-bg2: #0f1629;
  --clr-surface: rgba(255,255,255,0.04);
  --clr-surface-hover: rgba(255,255,255,0.08);
  --clr-border: rgba(255,255,255,0.08);
  --clr-primary: #00d4ff;
  --clr-primary-dark: #0099cc;
  --clr-accent: #7c3aed;
  --clr-text: #e2e8f0;
  --clr-text-muted: #8892a4;
  --clr-text-dim: #4a5568;
  --clr-nav-bg: rgba(10,14,26,0.85);
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 32px rgba(0,0,0,0.4);
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="light"] {
  --clr-bg: #f0f4f8;
  --clr-bg2: #e2e8f0;
  --clr-surface: rgba(255,255,255,0.8);
  --clr-surface-hover: rgba(255,255,255,0.95);
  --clr-border: rgba(0,0,0,0.08);
  --clr-text: #1a202c;
  --clr-text-muted: #4a5568;
  --clr-text-dim: #a0aec0;
  --clr-nav-bg: rgba(240,244,248,0.9);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Noto Sans KR', sans-serif;
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ── NAV ─────────────────────────────────────── */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: var(--clr-nav-bg);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--clr-border);
  transition: var(--transition);
}
.nav-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 0 2rem;
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav-logo-icon {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; color: #fff;
}
.nav-logo-img {
  height: 38px; width: auto; border-radius: 6px;
  object-fit: contain;
}
.nav-logo-text { font-size: 1.1rem; font-weight: 700; color: var(--clr-text); }
.nav-logo-text span { color: var(--clr-primary); }
.nav-links { display: flex; gap: 0.25rem; list-style: none; }
.nav-links a {
  padding: 0.5rem 0.9rem; border-radius: 8px;
  color: var(--clr-text-muted); text-decoration: none; font-size: 0.9rem; font-weight: 500;
  transition: var(--transition);
}
.nav-links a:hover { background: var(--clr-surface); color: var(--clr-primary); }
.nav-actions { display: flex; align-items: center; gap: 0.75rem; }
#theme-toggle {
  background: var(--clr-surface); border: 1px solid var(--clr-border);
  color: var(--clr-text-muted); border-radius: 8px; padding: 0.4rem 0.6rem;
  cursor: pointer; font-size: 1rem; transition: var(--transition);
}
#theme-toggle:hover { color: var(--clr-primary); }
#hamburger { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
#hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--clr-text); margin: 5px 0; border-radius: 2px; transition: var(--transition);
}

/* ── HERO ─────────────────────────────────────── */
#hero {
  min-height: 100vh; position: relative;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
  background: radial-gradient(ellipse at 60% 40%, rgba(0,212,255,0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 20% 80%, rgba(124,58,237,0.08) 0%, transparent 60%),
              var(--clr-bg);
}
#hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-content {
  position: relative; z-index: 2; text-align: center;
  max-width: 860px; padding: 2rem;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(0,212,255,0.1); border: 1px solid rgba(0,212,255,0.2);
  color: var(--clr-primary); padding: 0.4rem 1rem; border-radius: 100px;
  font-size: 0.85rem; font-weight: 500; margin-bottom: 2rem;
  animation: fadeDown 0.8s ease both;
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 5rem); font-weight: 800; line-height: 1.1;
  margin-bottom: 1rem; animation: fadeDown 0.9s ease 0.1s both;
}
.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem); color: var(--clr-text-muted);
  max-width: 600px; margin: 0 auto 2.5rem; animation: fadeDown 1s ease 0.2s both;
}
.hero-buttons {
  display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap;
  animation: fadeDown 1.1s ease 0.3s both;
}
.btn {
  padding: 0.8rem 2rem; border-radius: 10px; font-weight: 600;
  font-size: 0.95rem; cursor: pointer; text-decoration: none;
  transition: var(--transition); border: none; display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--clr-primary), #0099cc);
  color: #000; box-shadow: 0 0 30px rgba(0,212,255,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 50px rgba(0,212,255,0.5); }
.btn-outline {
  background: var(--clr-surface); border: 1px solid var(--clr-border); color: var(--clr-text);
}
.btn-outline:hover { background: var(--clr-surface-hover); border-color: var(--clr-primary); color: var(--clr-primary); }
.hero-stats {
  display: flex; gap: 3rem; justify-content: center; flex-wrap: wrap;
  margin-top: 4rem; animation: fadeDown 1.2s ease 0.4s both;
}
.stat { text-align: center; }
.stat-num { font-size: 2.5rem; font-weight: 800; color: var(--clr-primary); line-height: 1; }
.stat-label { font-size: 0.85rem; color: var(--clr-text-muted); margin-top: 4px; }
.scroll-hint {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--clr-text-dim); font-size: 0.8rem; animation: bounce 2s infinite;
}
.scroll-hint svg { width: 24px; height: 24px; }

/* ── SECTIONS ─────────────────────────────────── */
section { padding: 6rem 2rem; }
.container { max-width: 1280px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 4rem; }
.section-tag {
  display: inline-block; color: var(--clr-primary);
  font-size: 0.85rem; font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; margin-bottom: 0.75rem;
}
.section-title { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 700; margin-bottom: 1rem; }
.section-desc { color: var(--clr-text-muted); max-width: 600px; margin: 0 auto; font-size: 1.05rem; }

/* ── ABOUT ────────────────────────────────────── */
#about { background: var(--clr-bg2); }
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center;
}
.about-visual {
  position: relative;
  max-width: 440px;
}
.about-visual-bg {
  width: 100%; height: 100%; border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(0,212,255,0.05), rgba(124,58,237,0.1));
  border: 1px solid var(--clr-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 8rem;
}
.about-visual-img {
  width: 100%; height: auto; border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
  object-fit: contain;
  background: rgba(255,255,255,0.03);
}
.about-info p { color: var(--clr-text-muted); margin-bottom: 1.5rem; font-size: 1.05rem; }
.about-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 2rem; }
.tag {
  background: var(--clr-surface); border: 1px solid var(--clr-border);
  color: var(--clr-primary); padding: 0.35rem 0.9rem;
  border-radius: 100px; font-size: 0.83rem; font-weight: 500;
}

/* ── RESEARCH AREAS ───────────────────────────── */
.research-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem;
}
.research-card {
  background: var(--clr-surface); border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg); padding: 2rem;
  transition: var(--transition); cursor: default; position: relative; overflow: hidden;
}
.research-card::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(0,212,255,0.03), rgba(124,58,237,0.03));
  opacity: 0; transition: var(--transition);
  pointer-events: none;  /* 가상요소가 버튼 클릭을 차단하지 않도록 */
}
.research-card:hover { transform: translateY(-4px); border-color: var(--clr-primary); box-shadow: var(--shadow); }
.research-card:hover::before { opacity: 1; }
.research-icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(124,58,237,0.15));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 1.25rem; color: var(--clr-primary);
}
.research-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.75rem; }
.research-card p { color: var(--clr-text-muted); font-size: 0.9rem; margin-bottom: 1rem; }
.research-keywords { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.keyword {
  background: rgba(0,212,255,0.08); color: var(--clr-primary);
  padding: 0.2rem 0.6rem; border-radius: 6px; font-size: 0.78rem;
}
.rd-detail-link {
  display: inline-block; margin-top: 1.25rem;
  font-size: 0.85rem; font-weight: 600; color: var(--clr-primary);
  text-decoration: none; cursor: pointer;
  padding: 0.4rem 1rem; border-radius: 8px;
  border: 1px solid rgba(0,212,255,0.3);
  background: none;
  transition: var(--transition);
  position: relative; z-index: 1;  /* ::before 가상요소 위에 위치 */
}
.rd-detail-link:hover {
  background: rgba(0,212,255,0.1);
  border-color: var(--clr-primary);
  transform: translateX(3px);
}
.pdf-detail-btn {
  font-family: inherit;
}

/* ── MEMBERS ──────────────────────────────────── */
#members { background: var(--clr-bg2); }
.member-group-title {
  font-size: 1.1rem; font-weight: 600; color: var(--clr-primary);
  border-bottom: 1px solid var(--clr-border); padding-bottom: 0.75rem;
  margin-bottom: 2rem; margin-top: 3rem;
}
.members-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1.5rem;
}
.member-card {
  background: var(--clr-surface); border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg); padding: 1.75rem; text-align: center;
  transition: var(--transition);
}
.member-card:hover { transform: translateY(-4px); border-color: var(--clr-primary); }
.member-card.professor { border-color: rgba(0,212,255,0.3); background: rgba(0,212,255,0.03); }
.member-photo-wrap {
  width: 100px; height: 100px; margin: 0 auto 1rem; position: relative;
}
.member-photo {
  width: 100px; height: 100px; border-radius: 50%; object-fit: cover;
  border: 3px solid var(--clr-primary); display: block;
}
.member-card:not(.professor) .member-photo-wrap { width: 80px; height: 80px; }
.member-card:not(.professor) .member-photo { width: 80px; height: 80px; }
.member-avatar {
  width: 80px; height: 80px; border-radius: 50%; margin: 0 auto 1rem;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem; font-weight: 700; color: #fff;
  border: 3px solid var(--clr-border);
}
.member-card.professor .member-photo-wrap { width: 120px; height: 120px; }
.member-card.professor .member-photo { width: 120px; height: 120px; }
.member-card.professor .member-avatar { width: 120px; height: 120px; font-size: 2.5rem; }
.member-name { font-size: 1rem; font-weight: 700; margin-bottom: 0.15rem; }
.member-name-en { font-size: 0.83rem; color: var(--clr-text-muted); margin-bottom: 0.4rem; }
.member-title { font-size: 0.83rem; color: var(--clr-primary); font-weight: 500; margin-bottom: 0.4rem; }
.member-dept { font-size: 0.78rem; color: var(--clr-text-dim); margin-bottom: 0.3rem; }
.member-thesis {
  font-size: 0.72rem; color: var(--clr-text-dim);
  margin-top: 0.5rem; line-height: 1.5;
  text-align: left;
  border-left: 2px solid var(--clr-primary);
  padding-left: 0.5rem;
}
.member-email { font-size: 0.8rem; color: var(--clr-text-muted); }
.member-email a { color: var(--clr-text-muted); text-decoration: none; }
.member-email a:hover { color: var(--clr-primary); }
.member-orcid { font-size: 0.75rem; color: var(--clr-text-dim); margin-top: 0.3rem; }
.member-tags { display: flex; flex-wrap: wrap; gap: 0.3rem; justify-content: center; margin-top: 0.75rem; }
.member-tag { font-size: 0.73rem; color: var(--clr-text-dim); background: var(--clr-surface); padding: 0.15rem 0.5rem; border-radius: 4px; }
.member-portal-btn {
  display: inline-flex; align-items: center; gap: 0.3rem;
  margin-top: 1rem; font-size: 0.82rem; font-weight: 600;
  color: var(--clr-primary); text-decoration: none;
  padding: 0.45rem 1rem; border-radius: 8px;
  border: 1px solid rgba(0,212,255,0.35);
  transition: all 0.2s;
}
.member-portal-btn:hover {
  background: rgba(0,212,255,0.1);
  border-color: var(--clr-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,212,255,0.15);
}

/* ── PUBLICATIONS ─────────────────────────────── */
.pub-filters { display: flex; gap: 0.5rem; flex-wrap: wrap; justify-content: center; margin-bottom: 2.5rem; }
.filter-btn {
  padding: 0.45rem 1.1rem; border-radius: 100px; border: 1px solid var(--clr-border);
  background: var(--clr-surface); color: var(--clr-text-muted);
  font-size: 0.88rem; font-weight: 500; cursor: pointer; transition: var(--transition);
}
.filter-btn.active, .filter-btn:hover {
  background: var(--clr-primary); border-color: var(--clr-primary); color: #000;
}
.pub-list { display: flex; flex-direction: column; gap: 1rem; }
.pub-card {
  background: var(--clr-surface); border: 1px solid var(--clr-border);
  border-radius: var(--radius); padding: 1.5rem;
  display: flex; gap: 1.5rem; align-items: flex-start;
  transition: var(--transition);
}
.pub-card:hover { border-color: var(--clr-primary); }
.pub-year {
  min-width: 56px; height: 56px; border-radius: 12px;
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(124,58,237,0.15));
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; font-weight: 800; color: var(--clr-primary); text-align: center; line-height: 1.2;
}
.pub-info { flex: 1; }
.pub-type {
  display: inline-block; font-size: 0.75rem; font-weight: 600;
  padding: 0.15rem 0.6rem; border-radius: 6px; margin-bottom: 0.5rem; text-transform: uppercase;
}
.pub-type.journal { background: rgba(0,212,255,0.1); color: var(--clr-primary); }
.pub-type.conference { background: rgba(124,58,237,0.1); color: #a78bfa; }
.pub-type.book { background: rgba(251,191,36,0.1); color: #fbbf24; }
.pub-title { font-size: 1rem; font-weight: 600; margin-bottom: 0.4rem; }
.pub-authors { font-size: 0.85rem; color: var(--clr-text-muted); margin-bottom: 0.3rem; }
.pub-journal { font-size: 0.85rem; color: var(--clr-text-dim); font-style: italic; }
.pub-links { display: flex; gap: 0.5rem; margin-top: 0.6rem; }
.pub-link {
  font-size: 0.8rem; color: var(--clr-primary); text-decoration: none;
  border: 1px solid rgba(0,212,255,0.3); padding: 0.2rem 0.6rem; border-radius: 6px;
  transition: var(--transition);
}
.pub-link:hover { background: rgba(0,212,255,0.1); }

/* ── PROJECTS ─────────────────────────────────── */
#projects { background: var(--clr-bg2); }
.projects-tabs { display: flex; gap: 0.5rem; margin-bottom: 2.5rem; justify-content: center; }
.tab-btn {
  padding: 0.5rem 1.5rem; border-radius: 100px; border: 1px solid var(--clr-border);
  background: var(--clr-surface); color: var(--clr-text-muted);
  font-size: 0.9rem; font-weight: 600; cursor: pointer; transition: var(--transition);
}
.tab-btn.active { background: var(--clr-primary); border-color: var(--clr-primary); color: #000; }
.projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1.5rem; }
.project-card {
  background: var(--clr-surface); border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg); padding: 2rem; transition: var(--transition);
}
.project-card:hover { transform: translateY(-4px); border-color: var(--clr-primary); }
.project-status {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.8rem; font-weight: 600; margin-bottom: 1rem;
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; }
.status-dot.ongoing { background: #22c55e; box-shadow: 0 0 8px rgba(34,197,94,0.5); animation: pulse 2s infinite; }
.status-dot.completed { background: var(--clr-text-dim); }
.project-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.75rem; }
.project-card p { font-size: 0.88rem; color: var(--clr-text-muted); margin-bottom: 1rem; }
.project-meta { font-size: 0.82rem; color: var(--clr-text-dim); }
.project-meta span { display: block; margin-bottom: 0.25rem; }
.project-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 1rem; }
.proj-pdf-btn {
  font-family: inherit;
  margin-top: 1rem;
}
.project-card--ongoing {
  border-color: rgba(34,197,94,0.35);
  background: linear-gradient(135deg, rgba(34,197,94,0.04), var(--clr-surface));
}
.project-card--ongoing:hover { border-color: #22c55e; }
.projects-ongoing-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 0.45rem 1.2rem; border-radius: 100px;
  background: rgba(34,197,94,0.1); border: 1px solid rgba(34,197,94,0.35);
  color: #22c55e; font-size: 0.88rem; font-weight: 600;
}
.projects-total-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 0.45rem 1.2rem; border-radius: 100px;
  background: var(--clr-surface); border: 1px solid var(--clr-border);
  color: var(--clr-text-muted); font-size: 0.88rem; font-weight: 500;
}


/* ── NEWS ─────────────────────────────────────── */
.news-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1.5rem; }
.news-card {
  background: var(--clr-surface); border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg); padding: 1.75rem; transition: var(--transition);
}
.news-card:hover { transform: translateY(-4px); border-color: var(--clr-primary); }
.news-meta { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; }
.news-cat {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  padding: 0.2rem 0.6rem; border-radius: 6px;
  background: rgba(0,212,255,0.1); color: var(--clr-primary);
}
.news-date { font-size: 0.82rem; color: var(--clr-text-dim); }
.news-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.6rem; }
.news-card p { font-size: 0.88rem; color: var(--clr-text-muted); }

/* ── EQUIPMENTS ────────────────────────────────── */
#equipments { background: var(--clr-bg2); }

.eq-group { margin-bottom: 3.5rem; }
.eq-group-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 1.5rem; flex-wrap: wrap;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--clr-border);
  margin-bottom: 2rem;
}
.eq-group-info h3 {
  font-size: 1.25rem; font-weight: 700; margin-bottom: 0.4rem;
  color: var(--clr-text);
}
.eq-group-info p { font-size: 0.9rem; color: var(--clr-text-muted); max-width: 580px; }
.eq-group-pdf-btn {
  display: inline-flex; align-items: center; gap: 0.5rem; flex-shrink: 0;
  padding: 0.65rem 1.4rem; border-radius: 10px;
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(124,58,237,0.15));
  border: 1px solid rgba(0,212,255,0.35);
  color: var(--clr-primary); font-size: 0.88rem; font-weight: 600;
  cursor: pointer; text-decoration: none; transition: var(--transition);
}
.eq-group-pdf-btn:hover {
  background: linear-gradient(135deg, rgba(0,212,255,0.25), rgba(124,58,237,0.25));
  border-color: var(--clr-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,212,255,0.2);
}
.eq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}
.eq-card {
  background: var(--clr-surface); border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg); padding: 1.75rem;
  display: flex; flex-direction: column; gap: 0.75rem;
  transition: var(--transition); position: relative; overflow: hidden;
}
.eq-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
  opacity: 0; transition: var(--transition);
}
.eq-card:hover { transform: translateY(-4px); border-color: var(--clr-primary); box-shadow: var(--shadow); }
.eq-card:hover::before { opacity: 1; }
.eq-card-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(124,58,237,0.15));
  display: flex; align-items: center; justify-content: center; font-size: 1.4rem;
}
.eq-cat {
  display: inline-block; font-size: 0.73rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.07em;
  padding: 0.2rem 0.65rem; border-radius: 6px;
  background: rgba(124,58,237,0.1); color: #a78bfa;
}
.eq-card h4 { font-size: 1rem; font-weight: 700; line-height: 1.4; }
.eq-card-en { font-size: 0.82rem; color: var(--clr-text-muted); }
.eq-card p { font-size: 0.88rem; color: var(--clr-text-muted); flex: 1; }
.eq-pdf-link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  margin-top: 0.25rem; align-self: flex-start;
  font-size: 0.82rem; font-weight: 600; color: var(--clr-primary);
  text-decoration: none; padding: 0.4rem 0.9rem; border-radius: 8px;
  border: 1px solid rgba(0,212,255,0.3); transition: var(--transition);
}
.eq-pdf-link:hover { background: rgba(0,212,255,0.1); border-color: var(--clr-primary); }

/* PDF 뷰어 모달 */
.pdf-modal-overlay {
  display: none; position: fixed; inset: 0; z-index: 2000;
  background: rgba(0,0,0,0.85); backdrop-filter: blur(8px);
  align-items: center; justify-content: center;
}
.pdf-modal-overlay.open { display: flex; }
.pdf-modal {
  background: var(--clr-bg2); border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg); width: min(90vw, 1000px);
  height: min(90vh, 800px); display: flex; flex-direction: column;
  box-shadow: 0 20px 80px rgba(0,0,0,0.7);
  animation: fadeDown 0.3s ease;
}
.pdf-modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 1.5rem; border-bottom: 1px solid var(--clr-border); flex-shrink: 0;
}
.pdf-modal-title { font-size: 0.95rem; font-weight: 600; color: var(--clr-text); }
.pdf-modal-actions { display: flex; align-items: center; gap: 0.75rem; }
.pdf-open-btn {
  font-size: 0.82rem; color: var(--clr-primary); text-decoration: none;
  border: 1px solid rgba(0,212,255,0.3); padding: 0.35rem 0.85rem;
  border-radius: 8px; transition: var(--transition);
}
.pdf-open-btn:hover { background: rgba(0,212,255,0.1); }
.pdf-modal-close {
  width: 32px; height: 32px; border-radius: 8px; border: none; cursor: pointer;
  background: var(--clr-surface); color: var(--clr-text-muted); font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center; transition: var(--transition);
}
.pdf-modal-close:hover { background: var(--clr-surface-hover); color: var(--clr-text); }
.pdf-modal iframe { flex: 1; border: none; border-radius: 0 0 var(--radius-lg) var(--radius-lg); }

/* ── CONTACT ──────────────────────────────────── */
#contact { background: var(--clr-bg2); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
.contact-info h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 2rem; }
.contact-item {
  display: flex; gap: 1rem; margin-bottom: 1.5rem; align-items: flex-start;
}
.contact-icon {
  width: 44px; height: 44px; border-radius: 12px; flex-shrink: 0;
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(124,58,237,0.15));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; color: var(--clr-primary);
}
.contact-item h4 { font-size: 0.85rem; font-weight: 600; color: var(--clr-text-muted); margin-bottom: 0.25rem; }
.contact-item p, .contact-item a {
  font-size: 0.95rem; color: var(--clr-text); text-decoration: none;
}
.contact-item a:hover { color: var(--clr-primary); }
.map-wrap {
  border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
}
.map-wrap iframe {
  display: block; width: 100%; border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.map-link-bar {
  display: flex; gap: 0.5rem; flex-wrap: wrap;
  padding: 0.75rem 1rem;
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
}
.map-link-bar a {
  font-size: 0.83rem; color: var(--clr-text-muted); text-decoration: none;
  padding: 0.3rem 0.75rem; border-radius: 6px; border: 1px solid var(--clr-border);
  transition: var(--transition);
}
.map-link-bar a:hover { color: var(--clr-primary); border-color: var(--clr-primary); background: rgba(0,212,255,0.05); }

/* ── FOOTER ───────────────────────────────────── */
footer {
  background: var(--clr-bg); border-top: 1px solid var(--clr-border);
  padding: 3rem 2rem; text-align: center;
}
.footer-inner { max-width: 1280px; margin: 0 auto; }
.footer-logo { font-size: 1.2rem; font-weight: 700; color: var(--clr-primary); margin-bottom: 0.75rem; }
.footer-copy { font-size: 0.85rem; color: var(--clr-text-dim); }

/* ── ANIMATIONS ───────────────────────────────── */
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}
.reveal {
  opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE ───────────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  #hamburger { display: block; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 68px; left: 0; right: 0;
    background: var(--clr-nav-bg); backdrop-filter: blur(20px);
    padding: 1rem; border-bottom: 1px solid var(--clr-border);
  }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 1.5rem; }
}