:root {
    --primary: #0D1B2A;
    --secondary: #1B263B;
    --accent: #00FFFF;
    --highlight: #7FFFD4;
    --text: #FFFFFF;
    --shadow: rgba(0,0,0,0.3);
    --card-bg: #1B263B;
  }

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

  body {
    background: linear-gradient(135deg, var(--primary), var(--secondary), #415A77);
    color: var(--text);
    font-family: 'Montserrat', sans-serif;
    line-height: 1.6;
    padding: 20px;
    max-width: 1400px;
    margin: 0 auto;
  }

  .header {
    text-align: center;
    padding: 30px 0;
    position: relative;
  }

  .header::after {
    content: "";
    display: block;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    margin: 20px auto;
    border-radius: 2px;
  }

  h1, h2, h3, h4 {
    font-weight: 600;
    margin: 25px 0 15px;
    color: var(--highlight);
  }

  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
  h3 { font-size: 1.5rem; }
  h4 { font-size: 1.2rem; }

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

  .container {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 30px;
    margin-top: 30px;
  }

  .sidebar {
    background: var(--secondary);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px var(--shadow);
    height: fit-content;
    position: sticky;
    top: 20px;
  }

  .sidebar-nav {
    list-style: none;
  }

  .sidebar-nav li {
    margin-bottom: 15px;
  }

  .sidebar-nav a {
    color: var(--text);
    text-decoration: none;
    display: block;
    padding: 10px;
    border-radius: 5px;
    transition: all 0.3s ease;
  }

  .sidebar-nav a:hover {
    background: rgba(255,255,255,0.1);
    color: var(--accent);
  }

  .content {
    background: rgba(13, 27, 42, 0.7);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px var(--shadow);
  }

  .card {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 5px 15px var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px var(--shadow);
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }

  .image-card {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px var(--shadow);
    transition: all 0.3s ease;
  }

  .image-card:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 25px var(--shadow);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
  }

  pre {
    background: #1E1E1E;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    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 5px;
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(0,255,255,0.1);
    padding: 2px 5px;
    border-radius: 3px;
    color: var(--accent);
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 25px 0;
    background: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
  }

  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  th {
    background: rgba(0,255,255,0.1);
    color: var(--accent);
  }

  tr:hover {
    background: rgba(0,255,255,0.05);
  }

  .note {
    background: rgba(0,255,255,0.1);
    border-left: 4px solid var(--accent);
    padding: 15px;
    margin: 20px 0;
    border-radius: 0 5px 5px 0;
  }

  .note-title {
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--accent);
  }

  .footer {
    text-align: center;
    margin-top: 50px;
    padding: 20px;
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
  }

  @media (max-width: 1024px) {
    .container {
      grid-template-columns: 1fr;
    }
    
    .sidebar {
      position: static;
      margin-bottom: 30px;
    }
  }

  @media (max-width: 768px) {
    body {
      padding: 15px;
    }
    
    h1 {
      font-size: 2rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  /* Animations */
  @keyframes pulse {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
  }

  .pulse {
    animation: pulse 2s infinite;
  }

  @keyframes slideIn {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
  }

  .content > * {
    animation: slideIn 0.5s ease forwards;
  }

  .content > *:nth-child(1) { animation-delay: 0.1s; }
  .content > *:nth-child(2) { animation-delay: 0.2s; }
  .content > *:nth-child(3) { animation-delay: 0.3s; }
  .content > *:nth-child(4) { animation-delay: 0.4s; }
  .content > *:nth-child(5) { animation-delay: 0.5s; }
  .content > *:nth-child(6) { animation-delay: 0.6s; }
  .content > *:nth-child(7) { animation-delay: 0.7s; }
  .content > *:nth-child(8) { animation-delay: 0.8s; }
  .content > *:nth-child(9) { animation-delay: 0.9s; }
  .content > *:nth-child(10) { animation-delay: 1s; }