:root {
    --primary: #121F3D;
    --secondary: #4C5697;
    --accent: #3FE071;
    --highlight: #FFA500;
    --text: #E0E0E0;
    --card-bg: rgba(255, 255, 255, 0.1);
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
  }

  body {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--text);
    min-height: 100%;
    line-height: 1.6;
    padding-top: 80px;
    background-attachment: fixed;
  }

  .header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(18, 31, 61, 0.95);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  }

  .header h1 {
    font-size: 1.5rem;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 700;
  }

  .notice {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 0.9rem;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 2rem;
  }

  .sidebar {
    position: sticky;
    top: 80px;
    height: calc(100vh - 100px);
    background: rgba(0, 0, 0, 0.2);
    border-radius: 16px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  }

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

  .nav-links li {
    margin-bottom: 1rem;
  }

  .nav-links a {
    color: var(--text);
    text-decoration: none;
    display: block;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all 0.3s ease;
  }

  .nav-links a:hover {
    background: rgba(63, 224, 113, 0.2);
    transform: translateX(5px);
  }

  .main-content {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 2rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  }

  article {
    max-width: 800px;
    margin: 0 auto;
  }

  article h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: white;
    position: relative;
    padding-bottom: 0.5rem;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
  }

  article h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: white;
  }

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

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

  .image-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px 12px 0 0;
  }

  .image-card .caption {
    padding: 1rem;
    font-size: 0.9rem;
  }

  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;
    font-size: 0.9rem;
    line-height: 1.5;
    position: relative;
  }

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

  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;
  }

  .floating-elements {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    z-index: 100;
  }

  .floating-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--highlight));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(63, 224, 113, 0.4);
    transition: all 0.3s ease;
  }

  .floating-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(63, 224, 113, 0.6);
  }

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

    .sidebar {
      position: static;
      height: auto;
      margin-bottom: 2rem;
    }

    .header {
      flex-direction: column;
      gap: 1rem;
      padding: 1rem;
    }

    .notice {
      width: 100%;
      text-align: center;
    }

    article h2 {
      font-size: 1.5rem;
    }

    article h3 {
      font-size: 1.2rem;
    }
  }

  @keyframes float {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-10px);
    }
  }

  .floating {
    animation: float 3s ease-in-out infinite;
  }

  .divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(63, 224, 113, 0.5), transparent);
    margin: 2rem 0;
  }