:root {
    --primary-dark: #002f6c;
    --primary-light: #005b96;
    --accent: #ff7e5f;
    --accent-light: #feb47b;
    --bg-light: #f4f4f4;
    --text-dark: #333;
    --text-light: #fff;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-light);
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  header {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    color: var(--text-light);
    padding: 2rem 0;
    text-align: center;
    border-radius: 0 0 20px 20px;
    box-shadow: var(--shadow);
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
  }

  header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 70%);
    transform: rotate(30deg);
    z-index: 0;
  }

  header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
  }

  .tagline {
    font-size: 1.2rem;
    opacity: 0.9;
    position: relative;
    z-index: 1;
  }

  .reference-note {
    background: rgba(255,255,255,0.2);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    display: inline-block;
    margin-top: 1rem;
    font-size: 0.9rem;
    backdrop-filter: blur(5px);
    position: relative;
    z-index: 1;
  }

  article {
    background: white;
    border-radius: 15px;
    padding: 2.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 3rem;
    position: relative;
  }

  article::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 0 0 15px 15px;
  }

  h2 {
    color: var(--primary-dark);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 3px;
  }

  h3 {
    color: var(--primary-light);
    font-size: 1.4rem;
    margin: 2rem 0 1rem;
  }

  p {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    line-height: 1.7;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .image-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px 12px 0 0;
  }

  .image-caption {
    padding: 1rem;
    background: linear-gradient(to bottom, rgba(255,255,255,0.9), white);
  }

  pre {
    background: #282c34;
    color: #abb2bf;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-size: 0.95rem;
    line-height: 1.5;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.3);
  }

  code {
    font-family: 'Fira Code', monospace;
    background: rgba(0,47,108,0.1);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9rem;
  }

  pre code {
    background: transparent;
    padding: 0;
  }

  .nav-tabs {
    display: flex;
    flex-wrap: wrap;
    margin: 2rem 0;
    background: linear-gradient(to right, var(--primary-dark), var(--primary-light));
    border-radius: 10px;
    overflow: hidden;
  }

  .nav-tab {
    flex: 1;
    min-width: 120px;
    text-align: center;
    padding: 1rem;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
  }

  .nav-tab:hover {
    background: rgba(255,255,255,0.1);
  }

  .nav-tab.active {
    background: white;
    color: var(--primary-dark);
    font-weight: bold;
  }

  .nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
  }

  .content-section {
    display: none;
    animation: fadeIn 0.5s ease;
  }

  .content-section.active {
    display: block;
  }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
  }

  footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-dark);
    opacity: 0.8;
    font-size: 0.9rem;
  }

  @media (max-width: 768px) {
    header h1 {
      font-size: 2rem;
    }
    
    .tagline {
      font-size: 1rem;
    }
    
    article {
      padding: 1.5rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
    
    .nav-tab {
      min-width: 100px;
      padding: 0.8rem 0.5rem;
      font-size: 0.9rem;
    }
  }

  /* Decorative elements */
  .decor-circle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,126,95,0.2) 0%, rgba(255,126,95,0) 70%);
    z-index: 0;
  }

  .circle-1 {
    width: 300px;
    height: 300px;
    top: -100px;
    right: -100px;
  }

  .circle-2 {
    width: 200px;
    height: 200px;
    bottom: -50px;
    left: -50px;
  }