/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f5f7fa;
  color: #333;
  line-height: 1.6;
}

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

/* Header */
.main-header {
  background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
  color: white;
  padding: 60px 20px;
  text-align: center;
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

.header-content h1 {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.subtitle {
  font-size: 18px;
  opacity: 0.95;
  font-weight: 400;
  max-width: 700px;
  margin: 0 auto;
}

/* Hero Section */
.hero-section {
  padding: 60px 20px 40px;
  text-align: center;
  background: white;
}

.hero-section h2 {
  font-size: 36px;
  color: #1e3c72;
  margin-bottom: 16px;
  font-weight: 700;
}

.hero-description {
  font-size: 18px;
  color: #5a6c7d;
  max-width: 600px;
  margin: 0 auto;
}

/* Cards Section */
.cards-section {
  padding: 40px 20px 80px;
  background: white;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

/* Data Card */
.data-card {
  background: white;
  border: 2px solid #e0e4e8;
  border-radius: 12px;
  padding: 32px;
  text-decoration: none;
  color: inherit;
  transition: all 0.4s ease;
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  position: relative;
  overflow: hidden;
}

.data-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(135deg, #2a5298 0%, #1e3c72 100%);
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

.data-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 32px rgba(30, 60, 114, 0.15);
  border-color: #2a5298;
}

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

.card-icon {
  color: #2a5298;
  margin-bottom: 20px;
}

.data-card h3 {
  font-size: 26px;
  color: #1e3c72;
  margin-bottom: 12px;
  font-weight: 700;
}

.card-description {
  font-size: 15px;
  color: #5a6c7d;
  margin-bottom: 20px;
  line-height: 1.6;
}

.card-features {
  list-style: none;
  margin-bottom: 24px;
  flex-grow: 1;
}

.card-features li {
  padding: 8px 0;
  padding-left: 24px;
  position: relative;
  font-size: 14px;
  color: #4a5568;
}

.card-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #28a745;
  font-weight: bold;
}

.card-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid #e8edf2;
  border-bottom: 1px solid #e8edf2;
  margin-bottom: 20px;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: #2a5298;
  margin-bottom: 4px;
}

.stat-label {
  display: block;
  font-size: 12px;
  color: #7a8a9e;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.card-action {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: #2a5298;
  font-size: 15px;
}

.card-action .arrow {
  font-size: 24px;
  transition: transform 0.3s ease;
}

.data-card:hover .card-action .arrow {
  transform: translateX(8px);
}

/* Features Section */
.features-section {
  padding: 80px 20px;
  background: #f8fafc;
}

.features-section h2 {
  text-align: center;
  font-size: 36px;
  color: #1e3c72;
  margin-bottom: 50px;
  font-weight: 700;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.feature-item {
  background: white;
  padding: 30px;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  transition: all 0.3s ease;
}

.feature-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.feature-item h4 {
  font-size: 20px;
  color: #1e3c72;
  margin-bottom: 12px;
  font-weight: 600;
}

.feature-item p {
  font-size: 14px;
  color: #5a6c7d;
  line-height: 1.6;
}

/* Categories Section */
.categories-section {
  padding: 80px 20px;
  background: white;
}

.categories-section h2 {
  text-align: center;
  font-size: 36px;
  color: #1e3c72;
  margin-bottom: 40px;
  font-weight: 700;
}

.categories-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  max-width: 1000px;
  margin: 0 auto;
}

.category-badge {
  background: linear-gradient(135deg, #2a5298 0%, #1e3c72 100%);
  color: white;
  padding: 12px 24px;
  border-radius: 30px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(42, 82, 152, 0.2);
  transition: all 0.3s ease;
}

.category-badge:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(42, 82, 152, 0.3);
}

/* Footer */
.main-footer {
  background: #1e3c72;
  color: white;
  padding: 60px 20px 30px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h4 {
  font-size: 18px;
  margin-bottom: 16px;
  font-weight: 600;
  color: #fff;
}

.footer-section p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: white;
  text-decoration: underline;
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-bottom p {
  font-size: 14px;
  margin-bottom: 8px;
  color: rgba(255, 255, 255, 0.9);
}

.copyright {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content h1 {
    font-size: 32px;
  }

  .subtitle {
    font-size: 16px;
  }

  .hero-section h2 {
    font-size: 28px;
  }

  .hero-description {
    font-size: 16px;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .features-section h2,
  .categories-section h2 {
    font-size: 28px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 480px) {
  .main-header {
    padding: 40px 20px;
  }

  .header-content h1 {
    font-size: 26px;
  }

  .subtitle {
    font-size: 14px;
  }

  .data-card {
    padding: 24px;
  }

  .data-card h3 {
    font-size: 22px;
  }

  .card-stats {
    grid-template-columns: 1fr;
  }
}

.sources-section {
  background: white;
  padding: 50px 40px;
  border-radius: 12px;
  margin-bottom: 40px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.sources-section h2 {
  font-size: 28px;
  color: #1e3c72;
  margin-bottom: 20px;
  text-align: center;
}

.sources-intro {
  text-align: center;
  color: #5a6c7d;
  margin-bottom: 30px;
}

.sources-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
}

.source-badge {
  background: linear-gradient(135deg, #2a5298 0%, #1e3c72 100%);
  color: white;
  padding: 10px 20px;
  border-radius: 25px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 2px 6px rgba(42, 82, 152, 0.2);
}