:root {
    --primary-color: #0A2463;
    --secondary-color: #B9CDE5;
    --highlight-color: #FF6F61;
    --background-color: #F3F4F6;
    --accent-color-1: #00E0FF;
    --accent-color-2: #7ED321;
    --alert-color: #D0021B;
    --font-title: 'Montserrat', sans-serif;
    --font-body: 'Roboto', sans-serif;
  }

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

  body {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--primary-color);
    font-family: var(--font-body);
    line-height: 1.6;
    padding: 20px;
  }

  .container {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
    max-width: 1440px;
    margin: 0 auto;
    background-color: var(--background-color);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  }

  header {
    grid-column: span 12;
    text-align: center;
    margin-bottom: 40px;
  }

  header h1 {
    font-family: var(--font-title);
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
  }

  header p {
    font-size: 1.2rem;
    color: var(--secondary-color);
  }

  article {
    grid-column: span 12;
  }

  article h2 {
    font-family: var(--font-title);
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 20px;
  }

  article h3 {
    font-family: var(--font-title);
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 30px 0 15px;
  }

  article p {
    margin-bottom: 15px;
    font-size: 1rem;
    color: #333;
  }

  article ul {
    list-style-type: disc;
    margin-left: 20px;
    margin-bottom: 15px;
  }

  article li {
    margin-bottom: 10px;
  }

  pre {
    background-color: #2d2d2d;
    color: #f8f8f2;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.9rem;
    margin-bottom: 20px;
  }

  code {
    font-family: 'Courier New', Courier, monospace;
  }

  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin: 30px 0;
  }

  .image-gallery img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    transition: transform 0.3s ease;
  }

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

  .note {
    background: var(--accent-color-1);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    text-align: center;
    margin: 30px 0;
    font-size: 1.1rem;
    animation: pulse 3s infinite;
  }

  @keyframes pulse {
    0% {
      background: var(--accent-color-1);
    }
    50% {
      background: var(--highlight-color);
    }
    100% {
      background: var(--accent-color-1);
    }
  }

  footer {
    grid-column: span 12;
    text-align: center;
    margin-top: 40px;
    font-size: 0.9rem;
    color: var(--secondary-color);
  }

  /* Responsive Design */
  @media (max-width: 1440px) {
    header h1 {
      font-size: 2.2rem;
    }
    article h2 {
      font-size: 1.8rem;
    }
    article h3 {
      font-size: 1.3rem;
    }
  }

  @media (max-width: 1200px) {
    .container {
      padding: 30px;
    }
  }

  @media (max-width: 1024px) {
    .container {
      grid-template-columns: repeat(12, 1fr);
    }
  }

  @media (max-width: 768px) {
    .container {
      grid-template-columns: repeat(6, 1fr);
    }
    header h1 {
      font-size: 2rem;
    }
    article h2 {
      font-size: 1.6rem;
    }
    .image-gallery {
      grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
  }

  @media (max-width: 480px) {
    .container {
      grid-template-columns: repeat(4, 1fr);
      padding: 20px;
    }
    header h1 {
      font-size: 1.8rem;
    }
    article h2 {
      font-size: 1.4rem;
    }
    .image-gallery {
      grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
  }

  @media (max-width: 320px) {
    .container {
      grid-template-columns: repeat(2, 1fr);
      padding: 15px;
    }
    header h1 {
      font-size: 1.5rem;
    }
    article h2 {
      font-size: 1.2rem;
    }
    .image-gallery {
      grid-template-columns: 1fr;
    }
  }

  /* Grid System */
  .col-span-1 { grid-column: span 1; }
  .col-span-2 { grid-column: span 2; }
  .col-span-3 { grid-column: span 3; }
  .col-span-4 { grid-column: span 4; }
  .col-span-6 { grid-column: span 6; }
  .col-span-12 { grid-column: span 12; }

  /* Buttons */
  .btn-primary {
    background-color: var(--highlight-color);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    font-family: var(--font-title);
    cursor: pointer;
    transition: background-color 0.3s ease;
  }

  .btn-primary:hover {
    background-color: var(--accent-color-1);
  }

  /* Links */
  a {
    color: var(--highlight-color);
    text-decoration: none;
    transition: color 0.3s ease;
  }

  a:hover {
    color: var(--accent-color-1);
  }

  /* Animations */
  .aurora-move {
    background: radial-gradient(circle, rgb(255, 87, 34), transparent);
    animation: aurora 15s linear infinite;
  }

  @keyframes aurora {
    0% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0); }
  }

  /* Code Blocks */
  .code-block {
    background-color: #1e1e1e;
    color: #dcdcdc;
    padding: 20px;
    border-radius: 8px;
    font-family: 'Courier New', Courier, monospace;
    overflow-x: auto;
    margin-bottom: 20px;
  }

  /* Data Visualization */
  .chart {
    width: 100%;
    height: 300px;
    background-color: var(--background-color);
    border: 1px solid var(--secondary-color);
    border-radius: 10px;
    margin-bottom: 20px;
  }

  /* Hover Effects */
  .fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s ease, transform 1s ease;
  }

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