/* =========================================
   Custom Styles - Academic Homepage (Dark)
   ========================================= */

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-card-hover: #263348;
  --primary: #60a5fa;
  --primary-dark: #3b82f6;
  --primary-light: rgba(96, 165, 250, 0.15);
  --accent: #a78bfa;
  --accent-light: rgba(167, 139, 250, 0.15);
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-faint: #64748b;
  --border: #334155;
  --border-light: #2d3a4e;
  --gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --gradient-soft: linear-gradient(135deg, rgba(59,130,246,0.15) 0%, rgba(139,92,246,0.15) 100%);
}

/* ---- Global dark overrides ---- */
body {
  background: var(--bg-primary) !important;
  color: var(--text-secondary) !important;
}

a { color: var(--primary); }
a:hover, a:focus { color: var(--accent); }

h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
}

/* ---- Navbar override ---- */
.navbar-custom {
  background: var(--bg-secondary) !important;
  border-bottom: 1px solid var(--border) !important;
}

.navbar-custom .navbar-brand,
.navbar-custom .nav li a {
  color: var(--text-secondary) !important;
}

.navbar-custom .navbar-brand:hover,
.navbar-custom .navbar-brand:focus,
.navbar-custom .nav li a:hover,
.navbar-custom .nav li a:focus {
  color: var(--primary) !important;
}

.navbar-custom .navbar-toggle .icon-bar {
  background: var(--text-muted);
}

@media only screen and (min-width: 768px) {
  .navbar-custom {
    background: var(--bg-secondary) !important;
  }
}

/* ---- Footer override ---- */
footer {
  background: var(--bg-secondary) !important;
  border-top: 1px solid var(--border) !important;
}

footer a { color: var(--text-muted) !important; }
footer a:hover { color: var(--primary) !important; }
footer .copyright { color: var(--text-faint) !important; }
footer .theme-by { color: var(--text-faint) !important; }
footer .fa-stack .fa-circle { color: var(--text-faint); }
footer .fa-stack:hover .fa-circle { color: var(--primary); }

/* ---- Hero Section ---- */
.hero-section {
  position: relative;
  background: var(--gradient);
  padding: 100px 0 80px;
  overflow: hidden;
  margin-top: 51px;
}

@media (min-width: 768px) {
  .hero-section {
    padding: 120px 0 100px;
    margin-top: 91px;
  }
}

.hero-particles {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(255,255,255,0.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,0.04) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(255,255,255,0.03) 0%, transparent 50%);
}

.hero-avatar {
  width: 140px; height: 140px;
  margin: 0 auto 25px;
  border-radius: 50%;
  border: 4px solid rgba(255,255,255,0.2);
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  transition: transform 0.3s ease;
}

.hero-avatar:hover { transform: scale(1.05); }

.hero-avatar img {
  width: 100%; height: 100%;
  object-fit: cover;
}

.hero-name {
  color: #fff;
  font-size: 42px;
  font-weight: 800;
  margin: 0 0 10px;
  letter-spacing: -0.5px;
}

@media (min-width: 768px) {
  .hero-name { font-size: 52px; }
}

.hero-title {
  color: rgba(255,255,255,0.9);
  font-size: 18px; font-weight: 300;
  margin: 0 0 5px;
  font-family: 'Open Sans', sans-serif;
}

.hero-affiliation {
  color: rgba(255,255,255,0.6);
  font-size: 16px; font-weight: 300;
  margin: 0 0 30px;
  font-family: 'Open Sans', sans-serif;
}

.hero-links {
  display: flex;
  justify-content: center;
  gap: 12px; flex-wrap: wrap;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 50px;
  background: rgba(255,255,255,0.1);
  color: #fff !important;
  text-decoration: none !important;
  font-family: 'Open Sans', sans-serif;
  font-size: 14px; font-weight: 600;
  letter-spacing: 0.3px;
  border: 1px solid rgba(255,255,255,0.2);
  transition: all 0.3s ease;
  backdrop-filter: blur(4px);
}

.hero-btn:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.35);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
  color: #fff !important;
}

/* ---- Section Titles ---- */
.section-title {
  text-align: center;
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 40px;
  position: relative;
}

.section-title span {
  position: relative;
  display: inline-block;
  padding: 0 20px;
  background: var(--bg-primary);
  z-index: 1;
}

.education-section .section-title span {
  background: var(--bg-secondary);
}

.section-title::before {
  content: '';
  position: absolute;
  top: 50%; left: 0; right: 0;
  height: 1px;
  background: var(--border);
}

/* ---- About Section ---- */
.about-section {
  padding: 70px 0 50px;
  background: var(--bg-primary);
}

.about-content {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.about-content p { margin: 0 0 16px; }

.about-content a {
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.about-content a:hover { border-bottom-color: var(--primary); }

/* ---- Research Section ---- */
.research-section {
  padding: 70px 0;
  background: var(--bg-primary);
}

.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 600px) {
  .research-grid { grid-template-columns: 1fr; }
}

.research-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 24px;
  text-align: center;
  transition: all 0.3s ease;
}

.research-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(59, 130, 246, 0.1);
  border-color: var(--primary);
  background: var(--bg-card-hover);
}

.research-icon {
  display: none;
}

.research-card h3 {
  font-size: 16px; font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 8px;
}

.research-card p {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0; line-height: 1.5;
  font-family: 'Open Sans', sans-serif;
}

.research-subtitle {
  font-size: 13px; font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-faint);
  margin: 0 0 15px;
  font-family: 'Open Sans', sans-serif;
}

.research-subtitle:nth-of-type(2) {
  margin-top: 25px;
}

.research-card-current {
  border-color: rgba(167, 139, 250, 0.25);
  background: linear-gradient(135deg, rgba(139,92,246,0.06) 0%, rgba(59,130,246,0.06) 100%);
}

.research-card-current:hover {
  border-color: var(--accent);
  box-shadow: 0 12px 40px rgba(139, 92, 246, 0.15);
}


/* ---- Publications Section ---- */
.publications-section {
  padding: 70px 0;
  background: var(--bg-primary);
}

.pub-item {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-light);
  transition: all 0.2s ease;
}

.pub-item:last-of-type { border-bottom: none; }

.pub-item:hover {
  background: var(--bg-card);
  margin: 0 -16px;
  padding: 20px 16px;
  border-radius: 8px;
}

.pub-venue { flex-shrink: 0; padding-top: 2px; }

.venue-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 11px; font-weight: 700;
  font-family: 'Open Sans', sans-serif;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.venue-conf {
  background: var(--primary-light);
  color: var(--primary);
}

.venue-journal {
  background: var(--accent-light);
  color: var(--accent);
}

.venue-oral { position: relative; }

.venue-oral small {
  display: block;
  text-align: center;
  font-size: 9px; font-weight: 800;
  color: #f87171;
  margin-top: 2px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.pub-content h4 {
  font-size: 16px; font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 6px; line-height: 1.4;
}

.pub-authors {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 0 8px !important;
  font-family: 'Open Sans', sans-serif;
  line-height: 1.4;
}

.pub-links { display: flex; gap: 12px; flex-wrap: wrap; }

.pub-links a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-family: 'Open Sans', sans-serif;
  font-weight: 600;
  color: var(--primary) !important;
  text-decoration: none !important;
  padding: 3px 10px;
  border-radius: 4px;
  background: var(--primary-light);
  transition: all 0.2s ease;
}

.pub-links a:hover {
  background: var(--primary-dark);
  color: #fff !important;
}

.pub-category {
  font-size: 14px; font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-faint);
  margin: 30px 0 15px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  font-family: 'Open Sans', sans-serif;
}

.pub-category:first-of-type { margin-top: 0; }

.pub-venue-full {
  font-size: 12px;
  color: var(--text-faint);
  margin: 0 0 8px !important;
  font-family: 'Open Sans', sans-serif;
  font-style: italic;
}

.scholar-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  background: var(--gradient);
  color: #fff !important;
  text-decoration: none !important;
  font-family: 'Open Sans', sans-serif;
  font-size: 14px; font-weight: 700;
  letter-spacing: 0.3px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.25);
}

.scholar-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(59, 130, 246, 0.35);
  color: #fff !important;
}

/* ---- Education & Awards Section ---- */
.education-section {
  padding: 70px 0;
  background: var(--bg-secondary);
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px; top: 8px; bottom: 8px;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 28px;
}

.timeline-item:last-child { margin-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: -26px; top: 6px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid var(--bg-secondary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.timeline-dot-active {
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 3px var(--accent-light); }
  50% { box-shadow: 0 0 0 6px rgba(167, 139, 250, 0.1); }
  100% { box-shadow: 0 0 0 3px var(--accent-light); }
}

.timeline-content h4 {
  font-size: 16px; font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 4px;
}

.timeline-place {
  font-size: 14px; font-weight: 600;
  color: var(--primary);
  margin: 0 0 2px !important;
  font-family: 'Open Sans', sans-serif;
}

.timeline-date {
  font-size: 12px;
  color: var(--text-faint);
  margin: 0 0 2px !important;
  font-family: 'Open Sans', sans-serif;
  font-style: italic;
}

.timeline-detail {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 !important;
  font-family: 'Open Sans', sans-serif;
  line-height: 1.5;
}

.timeline-detail a {
  color: var(--primary);
}

/* Awards */
.awards-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.award-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.award-icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: 10px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
}

.award-content h4 {
  font-size: 15px; font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 4px;
}

.award-content p {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 !important;
  font-family: 'Open Sans', sans-serif;
  line-height: 1.5;
}

.award-category {
  color: var(--text-faint);
  font-size: 12px;
}

/* ---- Smooth scroll ---- */
html { scroll-behavior: smooth; }

/* ---- Override default page styles for home ---- */
.home-page .navbar-custom .avatar-container {
  display: none !important;
}

/* ---- Fade-in animation ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.about-section,
.research-section,
.publications-section,
.education-section {
  animation: fadeInUp 0.6s ease-out;
}

/* ---- Responsive tweaks ---- */
@media (max-width: 600px) {
  .hero-name { font-size: 32px; }
  .hero-title { font-size: 15px; }
  .section-title { font-size: 24px; }
  .pub-item { flex-direction: column; gap: 8px; }
  .hero-links { gap: 8px; }
  .hero-btn { font-size: 12px; padding: 8px 16px; }
}