:root {
    --primary-color: #0f2027;
    --secondary-color: #203a43;
    --accent-color: #00ffcc;
    --text-color: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.1);
    --transition: all 0.3s ease;
  }

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

  body {
    font-family: 'Montserrat', 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), #2c5364);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100%;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
  }

  header {
    text-align: center;
    padding: 3rem 0;
    position: relative;
  }

  header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
  }

  h1, h2, h3, h4 {
    margin-bottom: 1.5rem;
    font-weight: 600;
  }

  h1 {
    font-size: 2.5rem;
    background: linear-gradient(90deg, var(--accent-color), #00ccff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
  }

  h2 {
    font-size: 1.8rem;
    position: relative;
    padding-bottom: 0.5rem;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--accent-color);
  }

  h3 {
    font-size: 1.5rem;
    margin-top: 2rem;
  }

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

  .notice {
    background: rgba(0, 255, 204, 0.1);
    border-left: 4px solid var(--accent-color);
    padding: 1rem;
    margin: 2rem 0;
    border-radius: 0 4px 4px 0;
  }

  .card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    padding: 2rem;
    margin: 2rem 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }

  .image-container {
    position: relative;
    overflow: hidden;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
  }

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

  .image-container img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
  }

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

  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    position: relative;
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent-color);
    color: var(--primary-color);
    padding: 0.2rem 0.8rem;
    font-size: 0.8rem;
    border-radius: 0 8px 0 8px;
    font-weight: bold;
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9rem;
  }

  ol {
    margin-left: 2rem;
    margin-bottom: 2rem;
  }

  li {
    margin-bottom: 1rem;
    position: relative;
  }

  li span {
    font-weight: bold;
    color: var(--accent-color);
  }

  .navigation {
    position: fixed;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
  }

  .nav-item {
    display: block;
    width: 10px;
    height: 10px;
    margin: 1rem 0;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    transition: var(--transition);
  }

  .nav-item:hover, .nav-item.active {
    background: var(--accent-color);
    transform: scale(1.5);
  }

  @media (max-width: 768px) {
    .container {
      padding: 1.5rem;
    }
    
    h1 {
      font-size: 2rem;
    }
    
    h2 {
      font-size: 1.5rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
    
    .navigation {
      display: none;
    }
  }