:root {
    --deep-blue: #0B2E4C;
    --sky-blue: #3F87C6;
    --white: #FFFFFF;
    --gray: #F5F5F5;
    --orange: #FFA500;
    --dark-orange: darkorange;
    --metal-gray: #4A5568;
    --gradient-blue: linear-gradient(135deg, var(--deep-blue), var(--sky-blue));
  }

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

  body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--metal-gray);
    background: var(--gray);
    overflow-x: hidden;
  }

  .tech-notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0,0,0,0.7);
    color: white;
    padding: 10px 15px;
    border-radius: 5px;
    font-size: 14px;
    z-index: 1000;
  }

  .hero-section {
    min-height: 600px;
    background: var(--gradient-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 0 5%;
  }

  .hero-content {
    max-width: 1200px;
    width: 100%;
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
  }

  .hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
  }

  .hero-subtitle {
    font-size: 1.5rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    opacity: 0.9;
  }

  .parallax-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 120%;
    background: var(--gradient-blue);
    z-index: 1;
    transform: translateY(-10%);
  }

  .decorative-grid {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
      linear-gradient(rgba(255,255,255,0.1) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: 1;
  }

  .content-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 5%;
  }

  article {
    background: var(--white);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    padding: 60px;
    margin-bottom: 60px;
  }

  article h2 {
    color: var(--deep-blue);
    font-size: 2.5rem;
    margin-bottom: 2rem;
    position: relative;
    padding-bottom: 15px;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 4px;
    background: var(--orange);
    border-radius: 2px;
  }

  article h3 {
    color: var(--sky-blue);
    font-size: 1.8rem;
    margin: 2.5rem 0 1.5rem;
  }

  article p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--metal-gray);
  }

  pre {
    background: #1E1E1E;
    border-radius: 8px;
    padding: 20px;
    margin: 2rem 0;
    overflow: auto;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #D4D4D4;
    font-size: 0.95rem;
  }

  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 3rem 0;
  }

  .gallery-item {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .gallery-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
  }

  .gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
  }

  .gallery-item:hover img {
    transform: scale(1.05);
  }

  .nav-tabs {
    position: sticky;
    top: 0;
    background: var(--white);
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
    z-index: 100;
    padding: 15px 0;
    margin-bottom: 40px;
  }

  .nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
  }

  .nav-tab {
    margin: 0 15px;
    padding: 10px 0;
    position: relative;
    color: var(--deep-blue);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
  }

  .nav-tab:hover {
    color: var(--orange);
  }

  .nav-tab::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--orange);
    transition: width 0.3s ease;
  }

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

  @media (max-width: 768px) {
    .hero-title {
      font-size: 2.5rem;
    }
    
    .hero-subtitle {
      font-size: 1.2rem;
    }
    
    article {
      padding: 40px;
    }
    
    article h2 {
      font-size: 2rem;
    }
    
    article h3 {
      font-size: 1.5rem;
    }
    
    .content-container {
      padding: 40px 5%;
    }
    
    .image-gallery {
      grid-template-columns: 1fr;
    }
  }

  @media (max-width: 480px) {
    .hero-title {
      font-size: 2rem;
    }
    
    article {
      padding: 30px 20px;
    }
    
    .nav-container {
      justify-content: space-around;
    }
    
    .nav-tab {
      margin: 0 5px;
      font-size: 0.9rem;
    }
  }

  /* Animation classes */
  .fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* Scroll animation trigger */
  window.addEventListener('scroll', function() {
    const elements = document.querySelectorAll('.fade-in');
    elements.forEach(el => {
      const rect = el.getBoundingClientRect();
      if (rect.top < window.innerHeight - 100) {
        el.classList.add('visible');
      }
    });
  });