/* ... keep existing code (all previous styles) */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: #1e293b;
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #cbd5e1 100%);
  min-height: 100vh;
  font-feature-settings: 'cv11', 'ss01';
  font-variation-settings: 'opsz' 32;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.header {
  position: relative;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid #e2e8f0;
  text-align: center;
  padding: 3rem 1.5rem;
}

.header-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(59, 130, 246, 0.05) 0%, rgba(99, 102, 241, 0.05) 100%);
}

.header-content {
  position: relative;
  max-width: 1152px;
  margin: 0 auto;
}

.logo-container {
  margin-bottom: 1.5rem;
}

.logo {
  width: 12rem;
  height: auto;
  transition: transform 0.3s ease;
}

.logo:hover {
  transform: scale(1.05);
}

.contact-logo {
  width: 8rem;
}

.main-title {
  font-size: clamp(2rem, 5vw, 3.75rem);
  margin-bottom: 1.5rem;
  line-height: 1.1;
}

.gradient-text {
  background: linear-gradient(90deg, #3b82f6, #6366f1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-purple {
  background: linear-gradient(90deg, #6366f1, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.authors {
  margin-bottom: 2rem;
}

.author-names {
  font-size: 1.25rem;
  color: #374151;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.affiliations {
  font-size: 1.125rem;
  color: #6b7280;
}

.action-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.3s ease;
  font-size: 1.125rem;
  border: none;
  cursor: pointer;
}

.btn-icon {
  margin-right: 0.5rem;
  font-size: 1.25rem;
}

.btn-red {
  background-color: #dc2626;
  color: white;
}

.btn-red:hover {
  background-color: #b91c1c;
  transform: translateY(-2px);
}

.btn-blue {
  background-color: #2563eb;
  color: white;
}

.btn-blue:hover {
  background-color: #1d4ed8;
  transform: translateY(-2px);
}

.btn-github {
  background-color: #1f2937;
  color: white;
}

.btn-github:hover {
  background-color: #111827;
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  color: #374151;
  border: 2px solid #d1d5db;
}

.btn-outline:hover {
  background-color: #f9fafb;
  border-color: #9ca3af;
  transform: translateY(-2px);
}

.main-content {
  max-width: 1152px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

.section {
  margin-bottom: 5rem;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: clamp(1.875rem, 4vw, 2.25rem);
  margin-bottom: 1rem;
  color: #1e293b;
}

.section-subtitle {
  font-size: 1.25rem;
  color: #64748b;
  max-width: 48rem;
  margin: 0 auto;
}

.card {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.overview-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 768px) {
  .overview-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.feature-list {
  list-style: none;
  padding: 0;
}

.feature-list li {
  display: flex;
  align-items: center;
  padding: 0.75rem 0;
  font-size: 1.125rem;
  color: #374151;
}

.feature-list li::before {
  content: '';
  width: 0.5rem;
  height: 0.5rem;
  background: linear-gradient(45deg, #3b82f6, #6366f1);
  border-radius: 50%;
  margin-right: 0.75rem;
  flex-shrink: 0;
}

.image-card {
  background: white;
  border-radius: 0.75rem;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.image-card:hover {
  transform: scale(1.02);
}

.pipeline-img {
  width: 100%;
  height: auto;
  transition: transform 0.5s ease;
}

.image-card:hover .pipeline-img {
  transform: scale(1.05);
}

.image-caption {
  padding: 1rem;
  background: #f8fafc;
  text-align: center;
}

.image-caption p {
  font-size: 0.875rem;
  color: #64748b;
  margin: 0;
}

.demos-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .demos-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.demo-card {
  background: white;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.demo-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.video-container {
  position: relative;
  aspect-ratio: 16/9;
  background: #f1f5f9;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.demo-info {
  padding: 1.5rem;
}

.demo-info h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: #1e293b;
}

.demo-info p {
  color: #64748b;
}

.dataset-desc {
  font-size: 1.125rem;
  color: #374151;
  margin-bottom: 1.5rem;
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.dataset-features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .dataset-features {
    grid-template-columns: repeat(3, 1fr);
  }
}

.dataset-feature {
  text-align: center;
  padding: 1rem;
  background: #f8fafc;
  border-radius: 0.5rem;
}

.dataset-feature h3 {
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 0.5rem;
}

.dataset-feature p {
  color: #64748b;
}

.citation-block {
  background: #1e293b;
  color: #10b981;
  padding: 1.5rem;
  border-radius: 0.5rem;
  overflow-x: auto;
}

.citation-block pre {
  font-family: 'Courier New', monospace;
  font-size: 0.875rem;
  line-height: 1.5;
}

.tools-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 2rem;
}

.tool-logo {
  width: 6rem;
  height: 6rem;
  object-fit: contain;
  opacity: 0.7;
  transition: all 0.3s ease;
}

.tool-logo:hover {
  opacity: 1;
  transform: scale(1.1);
}

.back-button-container {
  margin-bottom: 2rem;
}

.team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .team-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.team-member {
  background: white;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.team-member:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.member-image {
  aspect-ratio: 1;
  background: linear-gradient(135deg, #e0f2fe 0%, #e1f5fe 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.member-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.team-member:hover .member-image img {
  transform: scale(1.05);
}

.member-info {
  padding: 1.5rem;
}

.member-info h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 0.75rem;
}

.member-contacts {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.contact-link {
  display: flex;
  align-items: center;
  color: #64748b;
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.contact-link:hover {
  color: #2563eb;
}

.contact-icon {
  margin-right: 0.5rem;
  font-size: 1rem;
}

.location-text, .feedback-text {
  font-size: 1.125rem;
  color: #374151;
  line-height: 1.7;
  text-align: center;
  max-width: 48rem;
  margin: 0 auto;
}

.feedback-card {
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border: 1px solid #bfdbfe;
  text-align: center;
}

.feedback-text {
  margin-bottom: 2rem;
}

.footer {
  background: #1e293b;
  color: white;
  padding: 3rem 0;
  text-align: center;
}

.footer-content {
  max-width: 1152px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.footer-text {
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

.footer-link {
  color: #60a5fa;
  text-decoration: none;
}

.footer-link:hover {
  color: #93c5fd;
  text-decoration: underline;
}

.footer-copyright {
  color: #94a3b8;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  animation: fadeInUp 0.8s ease-out forwards;
}

.delay-200 { animation-delay: 200ms; }
.delay-400 { animation-delay: 400ms; }
.delay-600 { animation-delay: 600ms; }
.delay-800 { animation-delay: 800ms; }
.delay-1000 { animation-delay: 1000ms; }
.delay-1200 { animation-delay: 1200ms; }
.delay-1400 { animation-delay: 1400ms; }
.delay-1600 { animation-delay: 1600ms; }

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

@media (max-width: 768px) {
  .action-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
  
  .main-content {
    padding: 2rem 1rem;
  }
  
  .section {
    margin-bottom: 3rem;
  }
}

/* 3D Viewer Styles */
.viewer-container {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 15px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  margin: 20px 0;
}

.three-viewer {
  width: 100%;
  height: 500px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  margin-bottom: 15px;
  background: #000;
}

.viewer-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
  margin-bottom: 10px;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.control-group label {
  color: white;
  font-weight: 500;
  font-size: 0.9rem;
}

.control-group select {
  padding: 8px 12px;
  border-radius: 6px;
  border: none;
  background: rgba(255, 255, 255, 0.9);
  color: #333;
  font-size: 0.9rem;
  cursor: pointer;
}

.control-btn {
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.control-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

.viewer-info {
  text-align: center;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.85rem;
  font-style: italic;
}

/* File Upload Styles */
.file-upload-group {
  position: relative;
}

.file-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.file-input-label {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.9);
  color: #333;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.file-input-label:hover {
  background: rgba(255, 255, 255, 1);
  border-color: #3b82f6;
}

/* Loading Indicator */
.loading-indicator {
  text-align: center;
  color: white;
  background: rgba(0, 0, 0, 0.8);
  border-radius: 10px;
  padding: 20px;
  margin-top: 10px;
}

.spinner {
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top: 3px solid white;
  width: 30px;
  height: 30px;
  animation: spin 1s linear infinite;
  margin: 0 auto 10px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .three-viewer {
    height: 400px;
  }
  
  .viewer-controls {
    flex-direction: column;
    align-items: stretch;
  }
  
  .control-group {
    justify-content: space-between;
  }
}