/* ============================================
   LAYOUT.CSS — Futuristic Layout System
   ============================================ */

/* Header — Glass morphism */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-base);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

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

.site-logo {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-logo span { color: var(--accent); }

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
  transform: rotate(15deg);
}

/* Navigation */
.main-nav {
  display: none;
  gap: 0.25rem;
}

.main-nav a {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.main-nav a:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.main-nav a.active {
  color: var(--accent);
  background: var(--accent-subtle);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-fast);
  border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile Nav Overlay */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-nav.active { opacity: 1; visibility: visible; }

.mobile-nav a {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.mobile-nav a:hover { color: var(--accent); }

.mobile-nav-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 2rem;
  cursor: pointer;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}

.mobile-nav-close:hover { background: var(--bg-secondary); }

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 1.5rem 4rem;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 80%, var(--accent-glow) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%);
  animation: pulse 8s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  animation: float 6s ease-in-out infinite;
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.hero-image {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(255,255,255,0.1);
  margin: 0 auto 2rem;
  background: var(--bg-secondary);
  animation: fadeIn 0.8s var(--ease-out) forwards;
  position: relative;
}

.hero-image::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.1);
  animation: pulse 3s ease-in-out infinite;
}

.hero h1 {
  color: white;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  margin-bottom: 0.5rem;
  animation: fadeInUp 0.8s var(--ease-out) 0.2s forwards;
  opacity: 0;
}

.hero-title {
  font-size: 1.125rem;
  font-weight: 400;
  color: rgba(255,255,255,0.6);
  margin-bottom: 1rem;
  animation: fadeInUp 0.8s var(--ease-out) 0.3s forwards;
  opacity: 0;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-tagline {
  font-size: 1.25rem;
  color: rgba(255,255,255,0.85);
  font-style: italic;
  margin-bottom: 1rem;
  animation: fadeInUp 0.8s var(--ease-out) 0.4s forwards;
  opacity: 0;
}

.hero-institution {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.5);
  animation: fadeInUp 0.8s var(--ease-out) 0.5s forwards;
  opacity: 0;
}

/* Metrics Bar */
.metrics-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  max-width: var(--max-width);
  margin: -3rem auto 0;
  padding: 0 1.5rem;
  position: relative;
  z-index: 10;
}

.metric-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

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

.metric-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.25rem;
  font-variant-numeric: tabular-nums;
}

.metric-label {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Research Cards */
.research-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.research-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.research-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.research-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.research-card:hover::before { transform: scaleX(1); }

.research-card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  color: var(--accent);
  border-radius: var(--radius-md);
  font-size: 1.25rem;
  margin-bottom: 1.25rem;
  transition: all var(--transition-base);
}

.research-card:hover .research-card-icon {
  background: var(--accent);
  color: white;
  transform: scale(1.1);
}

.research-card h3 { margin-bottom: 0.5rem; }
.research-card p { font-size: 0.9375rem; }

.research-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 1rem;
  transition: gap var(--transition-fast);
}

.research-card:hover .research-card-link { gap: 0.75rem; }

/* Publication Cards */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.pub-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.pub-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.pub-card:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

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

.pub-card.featured {
  border-color: var(--accent);
  background: var(--accent-subtle);
}

.pub-card.featured::before { opacity: 1; background: var(--accent); }

.pub-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.375rem;
  line-height: 1.4;
}

.pub-authors { font-size: 0.8125rem; color: var(--text-secondary); margin-bottom: 0.25rem; }
.pub-venue { font-size: 0.8125rem; font-style: italic; color: var(--text-muted); margin-bottom: 0.5rem; }

.pub-meta { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }

.pub-citations {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.pub-year { font-size: 0.75rem; font-weight: 500; color: var(--text-muted); }

/* Publication Filters */
.pub-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  padding: 0.75rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.filter-btn {
  padding: 0.5rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.filter-btn:hover { background: var(--bg-secondary); color: var(--text-primary); }

.filter-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* Quick Links */
.quick-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.quick-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all var(--transition-base);
}

.quick-link:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.quick-link-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  color: var(--accent);
  border-radius: var(--radius-full);
  font-size: 1.25rem;
  transition: all var(--transition-base);
}

.quick-link:hover .quick-link-icon {
  background: var(--accent);
  color: white;
  transform: scale(1.1);
}

.quick-link-text { font-weight: 600; color: var(--text-primary); text-align: center; font-size: 0.875rem; }

/* Timeline */
.timeline { position: relative; max-width: 600px; margin: 0 auto; padding-left: 2.5rem; }

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--border));
}

.timeline-item { position: relative; padding-bottom: 2rem; }
.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: -2.625rem;
  top: 0.25rem;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--accent);
}

.timeline-year {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.25rem;
}

.timeline-title { font-weight: 600; color: var(--text-primary); margin-bottom: 0.25rem; }
.timeline-desc { font-size: 0.875rem; color: var(--text-muted); }

/* CTA Banner */
.cta-banner {
  background: var(--gradient-hero);
  color: white;
  padding: 3rem 2rem;
  border-radius: var(--radius-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, var(--accent-glow) 0%, transparent 50%);
}

.cta-banner h2 { color: white; margin-bottom: 0.75rem; position: relative; }
.cta-banner p { color: rgba(255,255,255,0.75); max-width: 600px; margin: 0 auto 1.5rem; position: relative; }
.cta-banner .btn { position: relative; }

/* Collaborators */
.collaborators-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.collaborator-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  transition: all var(--transition-base);
}

.collaborator-card:hover { border-color: var(--accent); transform: translateX(4px); }

.collaborator-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.collaborator-name { font-weight: 600; font-size: 0.875rem; }
.collaborator-affiliation { font-size: 0.75rem; color: var(--text-muted); }

/* Modules */
.modules-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.module-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--border);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.module-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
}

.module-card:hover { transform: translateX(4px); border-color: var(--accent); }

.module-year {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.module-name { font-weight: 600; margin-bottom: 0.25rem; }
.module-code { font-size: 0.8125rem; color: var(--text-muted); font-family: var(--font-mono); }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.contact-info { display: flex; flex-direction: column; gap: 1.5rem; }

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  color: var(--accent);
  border-radius: var(--radius-md);
  flex-shrink: 0;
  font-size: 1.125rem;
}

.contact-label {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.125rem;
}

.contact-value { font-weight: 500; }

.contact-form {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid var(--border);
}

.form-group { margin-bottom: 1.25rem; }

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.375rem;
}

.form-input, .form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-textarea { min-height: 150px; resize: vertical; }

/* Social Links */
.social-links { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.social-link:hover {
  background: var(--accent-subtle);
  color: var(--accent);
  border-color: var(--accent);
}

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 3rem 1.5rem 1.5rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.footer-section h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.footer-section p, .footer-section a { font-size: 0.875rem; color: var(--text-secondary); }
.footer-section a:hover { color: var(--accent); }

.footer-links { list-style: none; padding: 0; }
.footer-links li { margin-bottom: 0.5rem; }
.footer-links a { color: var(--text-secondary); transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--accent); }

.footer-bottom {
  max-width: var(--max-width);
  margin: 2rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Page Header */
.page-header {
  padding: 8rem 1.5rem 4rem;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 50%, var(--accent-glow) 0%, transparent 50%);
}

.page-header h1 { color: white; position: relative; font-size: clamp(2rem, 4vw, 3rem); }
.page-header p { color: rgba(255,255,255,0.7); position: relative; font-size: 1.0625rem; max-width: 700px; }

/* Back Link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.back-link:hover { color: var(--accent); }

/* Responsive */
@media (min-width: 768px) {
  .metrics-bar { grid-template-columns: repeat(4, 1fr); margin-top: -3rem; }
  .metric-card { padding: 2rem 1.5rem; }
  .metric-value { font-size: 2.5rem; }
  .research-cards { grid-template-columns: repeat(2, 1fr); }
  .quick-links { grid-template-columns: repeat(4, 1fr); }
  .modules-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr 1fr; }
  .footer-inner { grid-template-columns: repeat(3, 1fr); }
  section { padding: var(--section-padding); }
}

@media (min-width: 1024px) {
  .header-inner { padding: 1rem 2rem; }
  .main-nav { display: flex; }
  .nav-toggle { display: none; }
  .hero { padding: 8rem 2rem 5rem; }
  .hero h1 { font-size: 4rem; }
  .hero-image { width: 180px; height: 180px; }
  .research-cards { grid-template-columns: repeat(3, 1fr); }
  .modules-grid { grid-template-columns: repeat(3, 1fr); }
  .collaborators-grid { grid-template-columns: repeat(3, 1fr); }
  .container { padding: 0 2rem; }
}