:root {
    --primary-color: #003366;
    --secondary-color: #8B4513;
    --accent-color: #FFD700;
    --background-light: #F5F5DC;
    --background-dark: #2F4F4F;
    --text-color: #333333;
    --text-light: #FFFFFF;
    --border-radius: 8px;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Courier Prime', 'Helvetica Neue', Arial, sans-serif;
  }

  body {
    background-color: var(--background-light);
    color: var(--text-color);
    line-height: 1.6;
    padding: 0;
    margin: 0;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .header {
    background: linear-gradient(135deg, var(--primary-color), #000000);
    color: var(--text-light);
    padding: 2rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 3rem;
  }

  .header::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 10px;
    background: linear-gradient(90deg, var(--accent-color), transparent);
  }

  .header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  }

  .header p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.9;
  }

  .design-notice {
    background-color: var(--accent-color);
    color: var(--primary-color);
    padding: 1rem;
    text-align: center;
    font-weight: bold;
    margin-bottom: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
  }

  .article-container {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
  }

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

  .sidebar {
    background-color: rgba(245, 245, 220, 0.8);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    height: fit-content;
    position: sticky;
    top: 20px;
  }

  .sidebar h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
  }

  .sidebar ul {
    list-style: none;
  }

  .sidebar li {
    margin-bottom: 0.8rem;
  }

  .sidebar a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: var(--transition);
    display: block;
    padding: 0.3rem 0;
  }

  .sidebar a:hover {
    color: var(--accent-color);
    transform: translateX(5px);
  }

  article {
    background-color: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
  }

  article h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 2rem;
    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-color), transparent);
  }

  article h3 {
    color: var(--secondary-color);
    margin: 1.5rem 0 1rem;
    font-size: 1.5rem;
  }

  article p {
    margin-bottom: 1.2rem;
    font-size: 1.1rem;
  }

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

  .gallery-item {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
  }

  .gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  }

  .gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
  }

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

  pre {
    background-color: #282c34;
    color: #abb2bf;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    overflow: auto;
    margin: 1.5rem 0;
    box-shadow: var(--box-shadow);
    font-size: 0.9rem;
    line-height: 1.5;
  }

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

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

  .footer {
    background: linear-gradient(135deg, var(--primary-color), #000000);
    color: var(--text-light);
    padding: 2rem 0;
    text-align: center;
    margin-top: 3rem;
  }

  .footer p {
    opacity: 0.8;
  }

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

  .fade-in {
    animation: fadeIn 0.8s ease-out forwards;
  }

  .delay-1 { animation-delay: 0.2s; }
  .delay-2 { animation-delay: 0.4s; }
  .delay-3 { animation-delay: 0.6s; }

  .highlight-box {
    background-color: rgba(255, 215, 0, 0.1);
    border-left: 4px solid var(--accent-color);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
  }

  .collapsible {
    margin: 1.5rem 0;
  }

  .collapsible-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 0.8rem 1.2rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    width: 100%;
    text-align: left;
    font-size: 1rem;
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .collapsible-btn:hover {
    background-color: #002244;
  }

  .collapsible-content {
    padding: 1rem;
    background-color: rgba(245, 245, 220, 0.5);
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    display: none;
    overflow: hidden;
    animation: fadeIn 0.5s ease-out;
  }

  .collapsible-content.show {
    display: block;
  }

  .tag-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1.5rem 0;
  }

  .tag {
    background-color: var(--secondary-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
  }