:root {
    --primary: #1A237E;
    --primary-dark: #121212;
    --accent: #2196F3;
    --accent-light: #3DDC84;
    --highlight: #FF9800;
    --text: #FFFFFF;
    --text-secondary: #B0BEC5;
  }

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

  body {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    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: 2rem;
  }

  .header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
  }

  .header::after {
    content: '';
    display: block;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    margin: 1rem auto;
    border-radius: 2px;
  }

  h1, h2, h3, h4 {
    font-weight: 700;
    margin: 1.5rem 0;
    line-height: 1.3;
  }

  h1 {
    font-size: 2.5rem;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
  }

  h2 {
    font-size: 1.8rem;
    color: var(--accent);
    position: relative;
    padding-bottom: 0.5rem;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--highlight);
    border-radius: 3px;
  }

  h3 {
    font-size: 1.5rem;
    color: var(--accent-light);
  }

  p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
  }

  a {
    color: var(--accent);
    text-decoration: none;
    transition: all 0.3s ease;
  }

  a:hover {
    color: var(--highlight);
  }

  .content-block {
    background: rgba(26, 35, 126, 0.3);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    border: 1px solid rgba(255,255,255,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .content-block:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
  }

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

  .image-card {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
  }

  .image-card:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
  }

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

  .image-card:hover img {
    transform: scale(1.1);
  }

  .image-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(26,35,126,0.7), rgba(33,150,243,0.5));
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .image-card:hover::after {
    opacity: 1;
  }

  pre {
    background: rgba(18,18,18,0.8);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow-x: auto;
    border-left: 4px solid var(--highlight);
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
    position: relative;
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--highlight);
    color: var(--primary-dark);
    padding: 0.2rem 0.5rem;
    font-size: 0.8rem;
    border-radius: 0 0 0 4px;
  }

  code {
    color: var(--accent-light);
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: rgba(26,35,126,0.3);
    border-radius: 8px;
    overflow: hidden;
  }

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

  th {
    background: rgba(33,150,243,0.2);
    color: var(--accent);
  }

  tr:hover {
    background: rgba(33,150,243,0.1);
  }

  .notice {
    background: rgba(61,220,132,0.1);
    border-left: 4px solid var(--accent-light);
    padding: 1rem;
    margin: 2rem 0;
    border-radius: 0 4px 4px 0;
  }

  .notice p {
    margin: 0;
    color: var(--accent-light);
  }

  ol, ul {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
  }

  li {
    margin-bottom: 0.5rem;
  }

  .network-animation {
    height: 200px;
    position: relative;
    margin: 2rem 0;
    overflow: hidden;
    border-radius: 8px;
    background: linear-gradient(45deg, var(--primary), var(--primary-dark));
  }

  .line {
    position: absolute;
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom, var(--highlight), var(--accent-light));
    animation: move 5s linear infinite;
  }

  @keyframes move {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
  }

  .button {
    display: inline-block;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.9rem;
    margin: 1rem 0;
    box-shadow: 0 4px 15px rgba(33,150,243,0.3);
    transition: all 0.3s ease;
  }

  .button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(33,150,243,0.4);
  }

  @media (max-width: 768px) {
    .container {
      padding: 1rem;
    }

    h1 {
      font-size: 2rem;
    }

    h2 {
      font-size: 1.5rem;
    }

    .content-block {
      padding: 1.5rem;
    }

    .image-grid {
      grid-template-columns: 1fr;
    }
  }