/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:     #1a3a6e;
  --primary-lt:  #2a5298;
  --accent:      #c8a84b;
  --accent-lt:   #e8c76b;
  --bg:          #ffffff;
  --bg-alt:      #f4f6fb;
  --text:        #1e2337;
  --text-muted:  #6b7280;
  --border:      #e2e8f0;
  --card-shadow: 0 4px 20px rgba(26,58,110,0.09);
  --radius:      12px;
  --transition:  0.3s ease;
  --max-w:       1160px;
}

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

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

a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-lt); }

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

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-alt); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ===== Navbar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(26,58,110,0.12); }
.nav-container {
  max-width: var(--max-w); margin: 0 auto;
  padding: 0 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-logo {
  width: 42px; height: 42px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-lt));
  color: #fff; font-weight: 700; font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  letter-spacing: 0.5px;
}
.nav-links { display: flex; list-style: none; gap: 0.25rem; }
.nav-links a {
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  font-size: 0.875rem; font-weight: 500; color: var(--text);
  transition: background var(--transition), color var(--transition);
}
.nav-links a:hover { background: var(--bg-alt); color: var(--primary); }
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--text); border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
  padding: 100px 1.5rem 4rem;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background: linear-gradient(135deg, var(--primary) 0%, #0d2451 55%, #1a3a6e 100%);
}
.hero-bg::after {
  content: '';
  position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-content {
  position: relative; z-index: 1;
  max-width: var(--max-w); width: 100%; margin: 0 auto;
  display: flex; align-items: center; gap: 4rem; flex-wrap: wrap;
}
.hero-avatar { flex-shrink: 0; }
.avatar-ring {
  width: 180px; height: 180px; border-radius: 50%;
  background: rgba(255,255,255,0.1);
  border: 3px solid var(--accent);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 0 8px rgba(200,168,75,0.15);
}
.avatar-initials {
  font-size: 3.5rem; font-weight: 700; color: #fff;
  letter-spacing: 2px; font-family: 'Merriweather', serif;
}
.avatar-photo {
  width: 100%; height: 100%;
  object-fit: cover; object-position: center top;
  border-radius: 50%;
}
.hero-text { flex: 1; min-width: 280px; }
.hero-greeting {
  font-size: 0.875rem; font-weight: 500;
  color: var(--accent-lt); letter-spacing: 3px; text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.hero-name {
  font-family: 'Merriweather', serif;
  font-size: clamp(1.75rem, 4vw, 2.8rem);
  font-weight: 700; color: #fff;
  line-height: 1.2; margin-bottom: 0.75rem;
}
.hero-title {
  font-size: 1.2rem; font-weight: 500;
  color: var(--accent-lt); margin-bottom: 0.25rem;
}
.hero-affil {
  font-size: 1rem; color: rgba(255,255,255,0.7);
  margin-bottom: 1.5rem;
}
.hero-badges {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin-bottom: 2rem;
}
.badge {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.9);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.78rem; font-weight: 500;
  display: flex; align-items: center; gap: 0.4rem;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-size: 0.9rem; font-weight: 600;
  cursor: pointer; border: none;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--accent);
  color: var(--primary);
}
.btn-primary:hover { background: var(--accent-lt); color: var(--primary); transform: translateY(-2px); }
.btn-outline {
  background: transparent;
  border: 2px solid rgba(255,255,255,0.5);
  color: #fff;
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); color: #fff; }
.btn-outline-sm {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.5rem 1.2rem;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 0.85rem; font-weight: 500; color: var(--text);
  transition: all var(--transition);
}
.btn-outline-sm:hover { border-color: var(--primary); color: var(--primary); background: var(--bg-alt); }

.hero-scroll {
  position: absolute; bottom: 2.5rem; left: 50%; transform: translateX(-50%);
  z-index: 1; animation: bounce 2s infinite;
}
.hero-scroll a { color: rgba(255,255,255,0.5); font-size: 1.3rem; }
.hero-scroll a:hover { color: #fff; }
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ===== Sections ===== */
.section { padding: 5rem 1.5rem; }
.section-alt { background: var(--bg-alt); }
.container { max-width: var(--max-w); margin: 0 auto; }

.section-header {
  text-align: center; margin-bottom: 3.5rem;
}
.section-tag {
  display: inline-block;
  font-size: 0.75rem; font-weight: 600; letter-spacing: 2.5px;
  text-transform: uppercase; color: var(--primary-lt);
  margin-bottom: 0.5rem;
}
.section-title {
  font-family: 'Merriweather', serif;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700; color: var(--text);
  position: relative; display: inline-block;
}
.section-title::after {
  content: ''; display: block;
  width: 50px; height: 3px;
  background: var(--accent);
  border-radius: 2px; margin: 0.6rem auto 0;
}
.section-sub { color: var(--text-muted); margin-top: 0.75rem; }

/* ===== About ===== */
.about-grid {
  display: grid; grid-template-columns: 1fr 320px; gap: 4rem; align-items: start;
}
.about-text p { color: var(--text-muted); margin-bottom: 1.2rem; font-size: 1.02rem; }
.about-text strong { color: var(--text); font-weight: 600; }
.about-stats {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem;
  position: sticky; top: 80px;
}
.stat-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition);
}
.stat-card:hover { transform: translateY(-4px); }
.stat-num {
  display: block; font-size: 2.2rem; font-weight: 700;
  color: var(--primary); font-family: 'Merriweather', serif;
}
.stat-label { font-size: 0.78rem; color: var(--text-muted); font-weight: 500; margin-top: 0.25rem; }

/* ===== Timeline ===== */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: ''; position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(to bottom, var(--primary), var(--border));
  border-radius: 2px;
}
.timeline-item {
  position: relative; margin-bottom: 2.5rem;
  padding-left: 2rem;
}
.timeline-dot {
  position: absolute; left: -2.5rem; top: 1.25rem;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-alt);
  box-shadow: 0 0 0 2px var(--accent);
}
.timeline-date {
  font-size: 0.8rem; font-weight: 600;
  color: var(--primary-lt); letter-spacing: 0.5px;
  margin-bottom: 0.5rem;
}
.timeline-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.timeline-card:hover { transform: translateX(4px); box-shadow: 0 8px 30px rgba(26,58,110,0.13); }
.timeline-card.highlight { border-left: 4px solid var(--accent); }
.timeline-card h3 { font-size: 1.05rem; font-weight: 700; color: var(--text); margin-bottom: 0.35rem; }
.timeline-org {
  font-size: 0.85rem; color: var(--text-muted);
  display: flex; align-items: center; gap: 0.4rem;
  margin-bottom: 0.25rem;
}
.timeline-card p:last-of-type { font-size: 0.9rem; color: var(--text-muted); margin-top: 0.75rem; }

/* ===== Education ===== */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}
.edu-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  display: flex; gap: 1.25rem;
  transition: transform var(--transition), box-shadow var(--transition);
}
.edu-card:hover { transform: translateY(-4px); box-shadow: 0 10px 30px rgba(26,58,110,0.14); }
.edu-icon {
  flex-shrink: 0;
  width: 48px; height: 48px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-lt));
  color: #fff; font-size: 1.25rem;
  display: flex; align-items: center; justify-content: center;
}
.edu-year {
  display: inline-block; font-size: 0.75rem; font-weight: 700;
  color: var(--accent); letter-spacing: 1px;
  background: rgba(200,168,75,0.1); padding: 0.2rem 0.6rem;
  border-radius: 4px; margin-bottom: 0.5rem;
}
.edu-body h3 { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 0.25rem; }
.edu-field { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.5rem; }
.edu-inst {
  font-size: 0.82rem; color: var(--primary-lt);
  display: flex; align-items: center; gap: 0.35rem; font-weight: 500;
}

/* ===== Research ===== */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}
.research-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.research-card:hover { transform: translateY(-5px); box-shadow: 0 12px 35px rgba(26,58,110,0.14); }
.research-icon {
  width: 64px; height: 64px; margin: 0 auto 1.25rem;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-lt) 100%);
  color: #fff; font-size: 1.5rem;
  display: flex; align-items: center; justify-content: center;
}
.research-card h3 { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 0.6rem; }
.research-card p { font-size: 0.875rem; color: var(--text-muted); line-height: 1.6; }

/* ===== Publications ===== */
.pub-list { display: flex; flex-direction: column; gap: 1.25rem; margin-bottom: 2.5rem; }
.pub-item {
  display: flex; gap: 1.5rem; align-items: flex-start;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition);
}
.pub-item:hover { transform: translateX(4px); }
.pub-year {
  flex-shrink: 0;
  font-size: 0.78rem; font-weight: 700;
  color: #fff; background: var(--primary);
  padding: 0.3rem 0.6rem; border-radius: 6px;
  letter-spacing: 0.5px; margin-top: 0.2rem;
}
.pub-title {
  font-size: 0.95rem; font-weight: 600;
  color: var(--text); margin-bottom: 0.4rem;
  font-style: italic;
}
.pub-meta { font-size: 0.85rem; color: var(--primary-lt); font-weight: 500; margin-bottom: 0.25rem; }
.pub-authors { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 0.6rem; }
.pub-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.pub-tags span {
  font-size: 0.72rem; font-weight: 600;
  background: rgba(42,82,152,0.08); color: var(--primary-lt);
  padding: 0.2rem 0.6rem; border-radius: 4px;
}
.pub-links { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center; }

/* ===== Awards ===== */
.awards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.award-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex; gap: 1.25rem;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition);
}
.award-card:hover { transform: translateY(-4px); }
.award-icon {
  flex-shrink: 0;
  width: 48px; height: 48px; border-radius: 12px;
  background: linear-gradient(135deg, var(--accent) 0%, #b8922a 100%);
  color: #fff; font-size: 1.2rem;
  display: flex; align-items: center; justify-content: center;
}
.award-year {
  display: inline-block; font-size: 0.72rem; font-weight: 700;
  color: var(--text-muted); letter-spacing: 1px;
  margin-bottom: 0.4rem;
}
.award-body h3 { font-size: 0.95rem; font-weight: 700; color: var(--text); margin-bottom: 0.3rem; }
.award-body p { font-size: 0.85rem; color: var(--text-muted); }
.award-org { font-size: 0.78rem; color: var(--primary-lt); font-weight: 500; margin-top: 0.25rem; }

/* ===== Memberships ===== */
.membership-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.member-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex; gap: 1.25rem; align-items: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition);
}
.member-card:hover { transform: translateY(-4px); }
.member-logo {
  flex-shrink: 0;
  width: 60px; height: 60px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-lt));
  color: #fff; font-size: 0.8rem; font-weight: 800; letter-spacing: 0.5px;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
}
.member-info h3 { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 0.25rem; }
.member-info p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.35rem; }
.member-cred {
  font-size: 0.75rem; font-weight: 600;
  background: rgba(200,168,75,0.15); color: #8a6820;
  padding: 0.2rem 0.6rem; border-radius: 4px;
  display: inline-block;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 4rem;
}
.contact-item {
  display: flex; gap: 1rem; margin-bottom: 1.75rem;
}
.contact-item i {
  flex-shrink: 0; margin-top: 0.2rem;
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-lt));
  color: #fff; font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
}
.contact-item h4 { font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); margin-bottom: 0.3rem; }
.contact-item p { font-size: 0.9rem; color: var(--text); line-height: 1.6; }
.contact-item a { color: var(--primary-lt); font-size: 0.9rem; font-weight: 500; }
.contact-item a:hover { color: var(--primary); }

.contact-social h3 {
  font-size: 1.1rem; font-weight: 700; color: var(--text);
  margin-bottom: 1.25rem;
}
.social-links {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem;
}
.social-card {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.85rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 0.875rem; font-weight: 500; color: var(--text);
  transition: all var(--transition);
}
.social-card i { font-size: 1.1rem; color: var(--primary-lt); }
.social-card:hover {
  border-color: var(--primary-lt);
  background: rgba(42,82,152,0.04);
  color: var(--primary);
  transform: translateY(-2px);
}

/* ===== Footer ===== */
.footer {
  background: var(--primary);
  color: rgba(255,255,255,0.7);
  text-align: center;
  padding: 2.5rem 1.5rem;
}
.footer p { font-size: 0.875rem; margin-bottom: 0.25rem; }
.footer-sub { font-size: 0.78rem; opacity: 0.6; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-stats { position: static; }
  .contact-grid { grid-template-columns: 1fr; gap: 2.5rem; }
}
@media (max-width: 768px) {
  .nav-links {
    display: none; flex-direction: column;
    position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem; gap: 0.25rem;
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.6rem 0.75rem; }
  .nav-toggle { display: flex; }
  .hero-content { flex-direction: column; text-align: center; gap: 2rem; }
  .hero-badges { justify-content: center; }
  .hero-actions { justify-content: center; }
  .timeline { padding-left: 1rem; }
  .timeline-item { padding-left: 1.5rem; }
  .timeline-dot { left: -1.75rem; }
  .social-links { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .section { padding: 3.5rem 1rem; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .pub-item { flex-direction: column; gap: 0.75rem; }
  .edu-card { flex-direction: column; gap: 0.75rem; }
  .award-card { flex-direction: column; gap: 0.75rem; }
}

/* ===== Publications category titles ===== */
.pub-category-title {
  font-size: 1rem; font-weight: 700; color: var(--primary);
  margin: 2.5rem 0 1rem;
  display: flex; align-items: center; gap: 0.6rem;
  border-bottom: 2px solid var(--border); padding-bottom: 0.5rem;
}
.pub-category-title i { color: var(--accent); font-size: 1rem; }

/* ===== Service blocks ===== */
.service-block { margin-bottom: 3rem; }
.service-block-title {
  font-size: 1rem; font-weight: 700; color: var(--primary);
  margin-bottom: 1.25rem;
  display: flex; align-items: center; gap: 0.6rem;
  border-bottom: 2px solid var(--border); padding-bottom: 0.5rem;
}
.service-block-title i { color: var(--accent); }

.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}
.service-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition);
}
.service-card:hover { transform: translateY(-3px); }
.service-card h4 { font-size: 0.9rem; font-weight: 700; color: var(--text); margin-bottom: 0.35rem; }
.service-card p { font-size: 0.85rem; color: var(--text-muted); }

.service-list { display: flex; flex-direction: column; gap: 0.85rem; }
.service-list-item {
  display: flex; gap: 1rem; align-items: flex-start;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.9rem 1.25rem;
  box-shadow: 0 2px 8px rgba(26,58,110,0.05);
}
.service-year {
  flex-shrink: 0;
  font-size: 0.75rem; font-weight: 700;
  color: #fff; background: var(--primary);
  padding: 0.2rem 0.55rem; border-radius: 5px;
  letter-spacing: 0.4px; margin-top: 0.15rem; white-space: nowrap;
}
.service-list-item p { font-size: 0.875rem; color: var(--text-muted); }
.service-list-item p strong { color: var(--text); }

/* ===== Animations ===== */
.fade-in {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }