:root {
    --primary: #1E272E;
    --secondary: #48BBE0;
    --accent: #3CE596;
    --text: #FFFFFF;
    --bg-gradient: linear-gradient(135deg, #1E272E, #1A1F26);
    --highlight-gradient: linear-gradient(45deg, #48BBE0, #3CE596);
    --card-bg: #2C3A47;
  }

  @font-face {
    font-family: 'Orbitron';
    src: url('fonts/Orbitron.woff2') format('woff2');
  }

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

  body {
    background: var(--bg-gradient);
    color: var(--text);
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    min-height: 100%;
    overflow-x: hidden;
  }

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

  header {
    padding: 40px 0;
    text-align: center;
    position: relative;
  }

  header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(72, 187, 224, 0.1), transparent 70%);
    z-index: -1;
  }

  h1, h2, h3, h4 {
    font-family: 'Orbitron', sans-serif;
    color: var(--secondary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 20px;
    text-shadow: 0 0 10px rgba(72, 187, 224, 0.3);
  }

  h2 {
    font-size: 2rem;
    background: var(--highlight-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(72, 187, 224, 0.3);
    margin-top: 40px;
  }

  h3 {
    font-size: 1.5rem;
    margin-top: 30px;
    color: var(--accent);
  }

  p {
    margin-bottom: 20px;
    font-size: 1.1rem;
  }

  .reference-banner {
    background: rgba(30, 39, 46, 0.8);
    border: 1px solid var(--secondary);
    border-radius: 4px;
    padding: 10px;
    margin: 20px 0;
    text-align: center;
    font-size: 0.9rem;
    color: var(--accent);
  }

  .article-container {
    background: rgba(30, 39, 46, 0.7);
    border-radius: 8px;
    padding: 40px;
    margin: 40px 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
  }

  .article-container::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(60, 229, 150, 0.05) 0%, transparent 70%);
    animation: rotate 60s linear infinite;
    z-index: -1;
  }

  @keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .image-card {
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s, box-shadow 0.3s;
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(72, 187, 224, 0.3);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px 8px 0 0;
  }

  .image-caption {
    padding: 15px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--secondary);
  }

  pre {
    background: #1A1F26;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow: auto;
    border-left: 3px solid var(--accent);
    position: relative;
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent);
    color: var(--primary);
    padding: 2px 10px;
    font-size: 0.8rem;
    border-radius: 0 0 0 4px;
  }

  code {
    font-family: 'Courier New', monospace;
    color: var(--accent);
  }

  .tab-nav {
    display: flex;
    justify-content: center;
    margin: 40px 0;
    position: relative;
  }

  .tab-nav::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--secondary), transparent);
  }

  .tab-btn {
    padding: 12px 25px;
    margin: 0 5px;
    background: transparent;
    border: none;
    color: var(--text);
    font-family: 'Orbitron', sans-serif;
    cursor: pointer;
    position: relative;
    transition: all 0.3s;
  }

  .tab-btn::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--highlight-gradient);
    transition: all 0.3s;
    transform: translateX(-50%);
  }

  .tab-btn:hover, .tab-btn.active {
    color: var(--accent);
  }

  .tab-btn:hover::after, .tab-btn.active::after {
    width: 100%;
  }

  .particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
  }

  .particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0.5;
    animation: particleMove 15s infinite linear;
  }

  @keyframes particleMove {
    0% { transform: translate(0, 0); opacity: 0; }
    10% { opacity: 0.5; }
    90% { opacity: 0.5; }
    100% { transform: translate(random(200) - 100px, random(200) - 100px); opacity: 0; }
  }

  .toggle-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
  }

  .toggle-btn {
    background: var(--highlight-gradient);
    border: none;
    padding: 8px 15px;
    border-radius: 20px;
    color: var(--primary);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 0 10px rgba(72, 187, 224, 0.5);
  }

  .toggle-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(60, 229, 150, 0.7);
  }

  @media (max-width: 768px) {
    .article-container {
      padding: 20px;
    }
    
    h2 {
      font-size: 1.5rem;
    }
    
    h3 {
      font-size: 1.2rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
    
    .tab-nav {
      flex-wrap: wrap;
    }
    
    .tab-btn {
      padding: 8px 15px;
      margin: 5px;
      font-size: 0.9rem;
    }
  }