/* Global Styles */
:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #e74c3c;
  --light-color: #ecf0f1;
  --dark-color: #2c3e50;
  --success-color: #2ecc71;
  --warning-color: #f39c12;
  --info-color: #3498db;
  --text-color: #333;
  --background-color: #f9f9f9;
  --timeline-line-color: #3498db;
  --timeline-dot-color: #e74c3c;
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition-speed: 0.3s;
  
  /* Category Colors */
  --ai-color: #9b59b6;
  --quantum-color: #3498db;
  --healthcare-color: #2ecc71;
  --energy-color: #f39c12;
  --transportation-color: #e74c3c;
  --space-color: #34495e;
}

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

body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header Styles */
header {
  background-color: var(--primary-color);
  color: white;
  padding: 2rem 0;
  text-align: center;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

header p {
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto;
}

/* Timeline Styles */
.timeline-container {
  position: relative;
  padding: 3rem 0;
}

.timeline-navigation {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
  position: sticky;
  top: 0;
  background-color: rgba(249, 249, 249, 0.95);
  padding: 1rem 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.year-button {
  background-color: var(--light-color);
  border: none;
  padding: 0.75rem 1.5rem;
  margin: 0 0.5rem;
  border-radius: 30px;
  font-weight: bold;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.year-button:hover {
  background-color: var(--secondary-color);
  color: white;
}

.year-button.active {
  background-color: var(--secondary-color);
  color: white;
}

.timeline-year {
  margin-bottom: 4rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.timeline-year.visible {
  opacity: 1;
  transform: translateY(0);
}

.year-header {
  text-align: center;
  margin-bottom: 2rem;
  position: relative;
}

.year-header h2 {
  font-size: 3rem;
  color: var(--primary-color);
  display: inline-block;
  padding: 0.5rem 2rem;
  background-color: white;
  border-radius: 30px;
  box-shadow: var(--card-shadow);
}

.categories-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.category-card {
  background-color: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition-speed);
}

.category-card:hover {
  transform: translateY(-5px);
}

.category-header {
  padding: 1rem;
  color: white;
  font-weight: bold;
}

.category-header.ai {
  background-color: var(--ai-color);
}

.category-header.quantum {
  background-color: var(--quantum-color);
}

.category-header.healthcare {
  background-color: var(--healthcare-color);
}

.category-header.energy {
  background-color: var(--energy-color);
}

.category-header.transportation {
  background-color: var(--transportation-color);
}

.category-header.space {
  background-color: var(--space-color);
}

.innovations-list {
  padding: 1rem;
}

.innovation-item {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #eee;
}

.innovation-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.innovation-name {
  font-weight: bold;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

.innovation-description {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.innovation-impact {
  font-size: 0.85rem;
  color: #666;
  display: flex;
  align-items: center;
  margin-top: 0.75rem;
}

.impact-icon {
  margin-right: 0.5rem;
  font-size: 1.2rem;
}

/* World Map Styles */
.world-map-container {
  margin-top: 3rem;
  padding: 2rem;
  background-color: white;
  border-radius: 10px;
  box-shadow: var(--card-shadow);
}

.world-map-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.world-map {
  width: 100%;
  height: 500px;
  background-color: #f5f5f5;
  border-radius: 8px;
}

/* Filter Controls */
.filter-controls {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin: 2rem 0;
  gap: 1rem;
}

.filter-button {
  background-color: var(--light-color);
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.filter-button:hover {
  background-color: var(--secondary-color);
  color: white;
}

.filter-button.active {
  background-color: var(--secondary-color);
  color: white;
}

.filter-button.ai {
  border-left: 4px solid var(--ai-color);
}

.filter-button.quantum {
  border-left: 4px solid var(--quantum-color);
}

.filter-button.healthcare {
  border-left: 4px solid var(--healthcare-color);
}

.filter-button.energy {
  border-left: 4px solid var(--energy-color);
}

.filter-button.transportation {
  border-left: 4px solid var(--transportation-color);
}

.filter-button.space {
  border-left: 4px solid var(--space-color);
}

/* Footer Styles */
footer {
  background-color: var(--primary-color);
  color: white;
  padding: 2rem 0;
  text-align: center;
  margin-top: 3rem;
}

footer p {
  margin-bottom: 1rem;
}

/* Responsive Styles */
@media (max-width: 768px) {
  .categories-container {
    grid-template-columns: 1fr;
  }
  
  .year-button {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }
  
  .timeline-navigation {
    flex-wrap: wrap;
  }
  
  .year-header h2 {
    font-size: 2.5rem;
  }
}

/* Animation Styles */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

/* Map Legend */
.map-legend {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
}

.legend-item {
  display: flex;
  align-items: center;
  margin-right: 1rem;
}

.legend-color {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  margin-right: 0.5rem;
}

.legend-text {
  font-size: 0.85rem;
}

/* Loading Indicator */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
}

.loading-spinner {
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-radius: 50%;
  border-top: 4px solid var(--secondary-color);
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}

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