/* General Styles and Typography */
body {
    margin: 0;
    font-family: Arial, sans-serif;
    color: #333;
    background: #f9f9fb;
  }
  h1, h2, h3 {
    margin: 0 0 0.5em;
  }
  p {
    margin: 0.5em 0 1em;
    line-height: 1.6;
  }
  a {
    text-decoration: none;
    color: #005bbb;
  }
  a:hover {
    text-decoration: underline;
  }
  
  /* Container Layout */
  header, section {
    width: 100%;
    max-width: 1200px;
    margin: auto;
    padding: 2em 1em;
    box-sizing: border-box;
  }
  
  /* Hero Section */
  .hero-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #e8f5ff;  /* light blue background for hero */
    flex-wrap: wrap;
  }
  .hero-text {
    flex: 1 1 500px;
    padding: 1em;
  }
  .hero-text h1 {
    font-size: 2.5em;
    color: #005bbb;
  }
  .hero-text .tagline {
    font-size: 1.2em;
    margin: 0.5em 0 1em;
  }
  .cta-button {
    display: inline-block;
    padding: 0.75em 1.5em;
    background: #005bbb;
    color: #fff;
    border-radius: 4px;
    font-weight: bold;
    transition: background 0.3s;
  }
  .cta-button:hover {
    background: #004999;
  }
  .hero-image {
    flex: 1 1 400px;
    text-align: center;
  }
  .hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
  }
  
  /* Features Section */
  .features-section {
    background: #fff;
    text-align: center;
  }
  .features-section h2 {
    margin-bottom: 1em;
    color: #005bbb;
  }
  .features-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2em;
  }
  .feature-item {
    background: #f1f7fb;
    border-radius: 8px;
    padding: 1.5em;
    width: 250px;
    text-align: center;
  }
  .feature-item .icon {
    font-size: 2em;
    color: #005bbb;
    margin-bottom: 0.5em;
  }
  .feature-item h3 {
    font-size: 1.1em;
    margin-bottom: 0.5em;
    color: #333;
  }
  .feature-item p {
    font-size: 0.95em;
    color: #555;
  }
  
  /* Data Visualization Section */
  .data-section {
    background: #fff;
    text-align: center;
  }
  .data-section h2 {
    color: #005bbb;
  }
  .data-description {
    margin-bottom: 1em;
    color: #555;
    font-style: italic;
  }
  #data-chart {
    /* Chart container – D3 will append an SVG here */
    display: inline-block;
    max-width: 100%;
  }
  
  /* Platform Section */
  .platform-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    background: #f9fcff;
  }
  .platform-text {
    flex: 1 1 500px;
    padding: 1em;
  }
  .platform-text h2 {
    color: #005bbb;
  }
  .platform-text p {
    color: #333;
    line-height: 1.5;
  }
  .platform-image {
    flex: 1 1 400px;
    text-align: center;
    padding: 1em;
  }
  .platform-image img {
    max-width: 100%;
    border-radius: 8px;
  }
  
  /* Call-to-Action Section */
  .cta-section {
    text-align: center;
    background: #005bbb;
    color: #fff;
    padding: 2em 1em;
  }
  .cta-section h2 {
    color: #fff;
    margin-bottom: 0.5em;
  }
  .cta-section p {
    margin-bottom: 1em;
  }
  .cta-section .cta-button {
    background: #fff;
    color: #005bbb;
  }
  .cta-section .cta-button:hover {
    background: #e0e0e0;
  }
  
  /* Footer */
  .footer {
    text-align: center;
    padding: 1em;
    font-size: 0.9em;
    color: #777;
  }
  
  /* Responsive Design */
  @media (max-width: 768px) {
    .hero-section, .platform-section {
      flex-direction: column;
      text-align: center;
    }
    .hero-text, .platform-text {
      max-width: none;
    }
    .hero-image, .platform-image {
      margin: 1em 0;
    }
    .features-grid {
      flex-direction: column;
      align-items: center;
    }
  }