/* MIT ARC Lab Visual Identity */
:root {
  /* ARC Lab Brand Colors */
  --arclab-primary: #0f1419;
  --arclab-secondary: #1a2332;
  --arclab-accent: #2563eb;
  --arclab-blue: #3b82f6;
  --arclab-cyan: #06b6d4;
  --arclab-gray-50: #f8fafc;
  --arclab-gray-100: #f1f5f9;
  --arclab-gray-200: #e2e8f0;
  --arclab-gray-300: #cbd5e1;
  --arclab-gray-400: #94a3b8;
  --arclab-gray-500: #64748b;
  --arclab-gray-600: #475569;
  --arclab-gray-700: #334155;
  --arclab-gray-800: #1e293b;
  --arclab-gray-900: #0f172a;
  
  /* Typography */
  --arclab-font-primary: 'Inter', system-ui, sans-serif;
  --arclab-font-mono: 'JetBrains Mono', monospace;
  
  /* Spacing */
  --arclab-spacing-xs: 0.25rem;
  --arclab-spacing-sm: 0.5rem;
  --arclab-spacing-md: 1rem;
  --arclab-spacing-lg: 1.5rem;
  --arclab-spacing-xl: 2rem;
  --arclab-spacing-2xl: 3rem;
  
  /* Shadows */
  --arclab-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --arclab-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --arclab-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --arclab-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

/* Base styles following ARC Lab identity */
.arclab-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--arclab-spacing-lg);
}

.arclab-section {
  padding: var(--arclab-spacing-2xl) 0;
}

.arclab-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: var(--arclab-spacing-lg);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.arclab-card:hover {
  border-color: var(--arclab-accent);
  transform: translateY(-2px);
  box-shadow: var(--arclab-shadow-xl);
}

/* Improved button styling */
.arclab-button {
  display: inline-flex;
  align-items: center;
  gap: var(--arclab-spacing-sm);
  padding: 10px 20px;
  background: var(--arclab-accent);
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.875rem;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  white-space: nowrap;
}

.arclab-button:hover {
  background: var(--arclab-blue);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.arclab-button-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--arclab-spacing-sm);
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--arclab-gray-300);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.875rem;
  transition: all 0.2s ease;
  cursor: pointer;
  white-space: nowrap;
}

.arclab-button-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
  color: white;
  transform: translateY(-1px);
}

.arclab-button-small {
  padding: 6px 12px;
  font-size: 0.75rem;
}

/* Filter button specific styling */
.filter-button {
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s ease;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
  color: var(--arclab-gray-300);
}

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

.filter-button:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.filter-button.active:hover {
  background: var(--arclab-blue);
}

/* Typography */
.arclab-heading-1 {
  font-size: 3rem;
  font-weight: 300;
  line-height: 1.2;
  color: white;
  margin-bottom: var(--arclab-spacing-lg);
}

.arclab-heading-2 {
  font-size: 2.25rem;
  font-weight: 400;
  line-height: 1.3;
  color: white;
  margin-bottom: var(--arclab-spacing-md);
}

.arclab-heading-3 {
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.4;
  color: white;
  margin-bottom: var(--arclab-spacing-sm);
}

.arclab-text {
  color: var(--arclab-gray-300);
  line-height: 1.6;
}

.arclab-text-accent {
  color: var(--arclab-accent);
}

/* Professional academic styling */
.publication-entry {
  border-left: 3px solid var(--arclab-accent);
  padding-left: var(--arclab-spacing-md);
  margin-bottom: var(--arclab-spacing-lg);
}

.citation-count {
  background: var(--arclab-accent);
  color: white;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
}

.venue-tag {
  background: var(--arclab-gray-800);
  color: var(--arclab-gray-300);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.875rem;
  border: 1px solid var(--arclab-gray-700);
}

/* Responsive design */
@media (max-width: 768px) {
  .arclab-container {
    padding: 0 var(--arclab-spacing-md);
  }
  
  .arclab-heading-1 {
    font-size: 2rem;
  }
  
  .arclab-heading-2 {
    font-size: 1.75rem;
  }
  
  .arclab-button, .arclab-button-secondary {
    padding: 8px 16px;
    font-size: 0.8rem;
  }
}

/* Animation utilities */
.arclab-fade-in {
  animation: fadeIn 0.6s ease-out forwards;
  opacity: 0;
}

.arclab-slide-up {
  animation: slideUp 0.8s ease-out forwards;
  opacity: 0;
  transform: translateY(30px);
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}