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

:root {
  --bg-primary: #060c18;
  --bg-secondary: #0a1525;
  --bg-card: #0f1e33;
  --bg-card-hover: #132540;
  --gold: #c9a84c;
  --gold-light: #e8c56a;
  --gold-dim: rgba(201, 168, 76, 0.12);
  --cyan: #06b6d4;
  --cyan-dim: rgba(6, 182, 212, 0.12);
  --text-primary: #f0f4f8;
  --text-secondary: #8ba3bf;
  --text-muted: #4d6a8a;
  --border: #162035;
  --border-light: #1d2f4a;
  --radius: 8px;
  --radius-lg: 14px;
  --transition: 0.25s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, rgba(26, 50, 80, 0.45) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  top: -20%;
  left: -10%;
  width: 60%;
  height: 60%;
  background: radial-gradient(ellipse, rgba(201, 168, 76, 0.035) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

/* ============================================================
   NAVIGATION
============================================================ */

.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(6, 12, 24, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
  height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-brand .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 7px 14px;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.nav-links a:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.nav-links a.active { color: var(--gold); background: var(--gold-dim); }

/* ============================================================
   HERO
============================================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 0 80px;
}

.hero-content { max-width: 700px; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--gold-dim);
  border: 1px solid rgba(201, 168, 76, 0.22);
  color: var(--gold);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 28px;
}

.hero-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.4rem, 5.5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.035em;
  margin-bottom: 22px;
}

.hero-title .accent { color: var(--gold); }

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 580px;
  line-height: 1.85;
  margin-bottom: 38px;
}

.btn-row { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gold);
  color: #060c18;
  font-weight: 700;
  font-size: 0.875rem;
  padding: 13px 26px;
  border-radius: var(--radius);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 20px rgba(201, 168, 76, 0.28);
}

.btn-primary:hover {
  background: var(--gold-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(201, 168, 76, 0.42);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 12px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  text-decoration: none;
  transition: border-color var(--transition), background var(--transition);
}

.btn-outline:hover {
  border-color: rgba(201, 168, 76, 0.38);
  background: var(--gold-dim);
}

.hero-metrics {
  display: flex;
  gap: 48px;
  margin-top: 64px;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}

.metric { text-align: left; }

.metric-value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
  letter-spacing: -0.03em;
}

.metric-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 5px;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}

/* ============================================================
   SECTIONS
============================================================ */

.section { padding: 90px 0; }
.section + .section { padding-top: 0; }

.section-header { margin-bottom: 52px; }

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}

.section-eyebrow::before {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--gold);
  border-radius: 1px;
}

.section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 14px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 580px;
  line-height: 1.85;
}

/* ============================================================
   CARDS
============================================================ */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(201, 168, 76, 0.45), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  border-color: rgba(201, 168, 76, 0.22);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}

.card:hover::before { opacity: 1; }

.card-icon {
  width: 44px;
  height: 44px;
  background: var(--gold-dim);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 20px;
}

.card-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.3;
}

.card-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.75;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--gold);
  font-size: 0.825rem;
  font-weight: 600;
  text-decoration: none;
  margin-top: 18px;
  transition: gap var(--transition);
}

.card-link:hover { gap: 10px; }
.card-link::after { content: '→'; }

/* ============================================================
   TAGS
============================================================ */

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }

.tag {
  display: inline-block;
  background: var(--cyan-dim);
  border: 1px solid rgba(6, 182, 212, 0.18);
  color: var(--cyan);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tag-gold {
  background: var(--gold-dim);
  border-color: rgba(201, 168, 76, 0.2);
  color: var(--gold);
}

.tag-slate {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--border-light);
  color: var(--text-secondary);
}

/* ============================================================
   PAGE HEADER
============================================================ */

.page-header {
  padding: 120px 0 56px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 72px;
}

.page-header-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.page-header-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  line-height: 1.85;
}

/* ============================================================
   TIMELINE
============================================================ */

.timeline { position: relative; }

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold), var(--border-light) 70%, transparent);
}

.timeline-item {
  padding-left: 30px;
  padding-bottom: 40px;
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -4px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--bg-primary), 0 0 0 5px rgba(201, 168, 76, 0.28);
}

.timeline-date {
  font-size: 0.72rem;
  color: var(--gold);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 5px;
}

.timeline-role {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
}

.timeline-org {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin: 3px 0 8px;
}

.timeline-detail {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.75;
}

/* ============================================================
   PUBLICATION ITEMS
============================================================ */

.pub-list { display: flex; flex-direction: column; gap: 16px; }

.pub-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 24px 28px;
  transition: background var(--transition), border-left-color var(--transition);
}

.pub-item:hover { background: var(--bg-card-hover); border-left-color: var(--gold-light); }

.pub-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: 6px;
}

.pub-venue {
  font-size: 0.85rem;
  color: var(--gold);
  font-style: italic;
  margin-bottom: 6px;
}

.pub-authors {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.pub-abstract {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ============================================================
   RECOGNITION ITEMS
============================================================ */

.recognition-item {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.recognition-item:last-child { border-bottom: none; }

.rec-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  background: var(--gold-dim);
  border: 1px solid rgba(201, 168, 76, 0.18);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-top: 2px;
}

.rec-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 3px;
}

.rec-org {
  font-size: 0.85rem;
  color: var(--gold);
  margin-bottom: 6px;
  font-weight: 500;
}

.rec-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ============================================================
   BIO / PROFILE PAGE
============================================================ */

.profile-section { padding: 120px 0 80px; }

.profile-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 56px;
  align-items: start;
}

.profile-photo-wrap {
  position: sticky;
  top: 90px;
}

.profile-photo {
  width: 220px;
  height: 220px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  display: block;
}

.profile-social {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 18px;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.social-link:hover {
  color: var(--gold);
  border-color: rgba(201, 168, 76, 0.3);
  background: var(--gold-dim);
}

.social-link svg { width: 15px; height: 15px; flex-shrink: 0; fill: currentColor; }

.profile-name {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 6px;
}

.profile-title-text {
  font-size: 1.05rem;
  color: var(--gold);
  font-weight: 500;
  margin-bottom: 28px;
}

.profile-bio {
  color: var(--text-secondary);
  font-size: 0.975rem;
  line-height: 1.9;
  margin-bottom: 20px;
}

/* ============================================================
   EXPERTISE GRID
============================================================ */

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.expertise-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  transition: border-color var(--transition);
}

.expertise-item:hover { border-color: rgba(201, 168, 76, 0.28); }

.expertise-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gold);
  margin-bottom: 5px;
}

.expertise-desc {
  font-size: 0.845rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ============================================================
   DIVIDER
============================================================ */

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 72px 0;
}

/* ============================================================
   FOOTER
============================================================ */

footer {
  border-top: 1px solid var(--border);
  padding: 36px 0;
  position: relative;
  z-index: 1;
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-copy { font-size: 0.82rem; color: var(--text-muted); }

.footer-links { display: flex; gap: 24px; }

.footer-links a {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--gold); }

/* ============================================================
   RESPONSIVE
============================================================ */

@media (max-width: 768px) {
  .profile-grid { grid-template-columns: 1fr; }
  .profile-photo-wrap { position: static; display: flex; flex-direction: column; align-items: center; }
  .profile-social { flex-direction: row; flex-wrap: wrap; justify-content: center; }
  .expertise-grid { grid-template-columns: 1fr; }
  .hero-metrics { gap: 28px; flex-wrap: wrap; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .container { padding: 0 20px; }
  .card-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; }
  .recognition-item { flex-direction: column; }
}