.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-gray-200);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: all var(--transition-normal);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  transition: height var(--transition-normal);
}

.logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--color-gray-900);
  font-weight: var(--font-bold);
  font-size: var(--text-xl);
  transition: transform var(--transition-fast);
}

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

/* Enhanced Navigation */
.navigation {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-8);
}

.nav-link {
  text-decoration: none;
  color: var(--color-gray-600);
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-gray-900);
}

.nav-link:hover::after {
  width: 100%;
}

/* Enhanced Features Section */
.features {
  padding: var(--space-24) 0;
  background: var(--color-gray-50);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
  animation: fadeInUp 0.8s ease-out;
}

.section-title {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-4);
  color: var(--color-gray-900);
}

.section-description {
  font-size: var(--text-xl);
  color: var(--color-gray-600);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

.feature-card {
  padding: var(--space-8);
  background: white;
  border-radius: var(--radius-2xl);
  text-align: center;
  transition: all var(--transition-normal);
  border: 1px solid var(--color-gray-200);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

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

.feature-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-6);
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  border-radius: var(--radius-2xl);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  transition: transform var(--transition-normal);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1);
}

.feature-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-4);
  color: var(--color-gray-900);
}

.feature-description {
  color: var(--color-gray-600);
  line-height: 1.6;
}

/* Enhanced CTA Section */
.cta {
  padding: var(--space-24) 0;
  background: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-gray-800) 100%);
  color: white;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="dots" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23dots)"/></svg>');
}

.cta-content {
  position: relative;
  z-index: 1;
  animation: fadeInUp 0.8s ease-out;
}

.cta-title {
  color: var(--color-gray-300);
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-4);
}

.cta-description {
  font-size: var(--text-xl);
  margin-bottom: var(--space-8);
  opacity: 0.9;
}

.cta-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
}

/* Enhanced Footer */
.footer {
  background: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-title {
  color: white;
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-4);
}

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

.footer-links li {
  margin-bottom: var(--space-2);
}

.footer-links a {
  color: var(--color-gray-300);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-gray-700);
}

.footer-social {
  display: flex;
  gap: var(--space-4);
}

.social-link {
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

.social-link:hover {
  color: var(--color-primary);
  transform: translateY(-2px);
}

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

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

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-8);
  }

  .hero-title {
    font-size: var(--text-4xl);
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-stats {
    justify-content: center;
    flex-wrap: wrap;
  }

  .nav-list {
    display: none;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --color-primary: #0000ff;
    --color-gray-600: #000000;
    --color-gray-800: #000000;
  }
}

/* Data Visualization Preview */
.hero-visualization {
  position: relative;
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-gray-200);
}

.visualization-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-gray-800);
  margin-bottom: var(--space-4);
  text-align: center;
}

.visualization-placeholder {
  height: 300px;
  background: linear-gradient(135deg, var(--color-gray-50), var(--color-gray-100));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.visualization-placeholder::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23e5e7eb" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

.visualization-caption {
  text-align: center;
  color: var(--color-gray-600);
  font-size: 0.875rem;
  margin-top: var(--space-3);
  font-style: italic;
}