:root {
    --primary-dark: #0D1B2A;
    --primary-light: #1B263B;
    --accent-purple: #415A77;
    --accent-teal: #778DA9;
    --text-light: #E0E1DD;
    --text-gray: #A9A9A9;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

  body {
    font-family: 'Roboto', 'Montserrat', sans-serif;
    background: var(--primary-dark);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  /* Header Styles */
  header {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    padding: 2rem 0;
    position: relative;
    overflow: hidden;
  }

  header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover;
    opacity: 0.1;
    z-index: 0;
  }

  .header-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 3rem 0;
  }

  .header-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, var(--text-light), var(--accent-teal));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }

  .header-content p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    color: var(--text-gray);
  }

  .style-reference {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(13, 27, 42, 0.8);
    padding: 10px 15px;
    border-radius: 30px;
    font-size: 0.9rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    z-index: 100;
    backdrop-filter: blur(5px);
    border: 1px solid var(--accent-purple);
  }

  /* Navigation */
  .main-nav {
    display: flex;
    justify-content: center;
    background: rgba(13, 27, 42, 0.9);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 99;
    backdrop-filter: blur(5px);
    border-bottom: 1px solid var(--accent-purple);
  }

  .nav-list {
    display: flex;
    list-style: none;
    gap: 2rem;
  }

  .nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: var(--transition);
    position: relative;
  }

  .nav-link:hover {
    color: var(--accent-teal);
  }

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-teal);
    transition: var(--transition);
    transform: translateX(-50%);
  }

  .nav-link:hover::after {
    width: 100%;
  }

  /* Article Styles */
  article {
    padding: 4rem 0;
  }

  article h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--accent-teal);
    position: relative;
    padding-bottom: 1rem;
  }

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

  article h3 {
    font-size: 1.8rem;
    margin: 2.5rem 0 1.5rem;
    color: var(--text-light);
  }

  article p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    line-height: 1.8;
  }

  /* Table Styles */
  table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: rgba(27, 38, 59, 0.3);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  }

  th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--accent-purple);
  }

  th {
    background: var(--primary-light);
    color: var(--text-light);
    font-weight: 500;
  }

  tr:hover {
    background: rgba(65, 90, 119, 0.2);
  }

  /* Code Block Styles */
  pre {
    background: rgba(13, 27, 42, 0.7);
    border: 1px solid var(--accent-purple);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
    overflow: auto;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    position: relative;
  }

  pre::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent-teal), var(--accent-purple));
  }

  code {
    font-family: 'Courier New', monospace;
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.5;
  }

  /* Image Gallery */
  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 3rem 0;
  }

  .gallery-item {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
  }

  .gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
  }

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

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

  /* Footer */
  footer {
    background: linear-gradient(to right, var(--primary-dark), var(--primary-light));
    padding: 3rem 0;
    text-align: center;
    margin-top: 4rem;
  }

  .footer-content {
    max-width: 800px;
    margin: 0 auto;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 2rem 0;
  }

  .footer-link {
    color: var(--text-gray);
    text-decoration: none;
    transition: var(--transition);
  }

  .footer-link:hover {
    color: var(--accent-teal);
  }

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

  .floating {
    animation: float 4s ease-in-out infinite;
  }

  /* Responsive */
  @media (max-width: 768px) {
    .header-content h1 {
      font-size: 2.5rem;
    }

    .nav-list {
      flex-direction: column;
      gap: 0.5rem;
    }

    article h2 {
      font-size: 2rem;
    }

    article h3 {
      font-size: 1.5rem;
    }

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