:root {
    --primary: #4b3832;
    --secondary: #d4a5a5;
    --accent: #f7d794;
    --bg-gradient: linear-gradient(135deg, #ffe5d9 0%, #d4a5a5 50%, #a8c0ff 100%);
    --text-light: #f8f3e6;
    --text-dark: #333333;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
  }

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

  body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-gradient);
    background-attachment: fixed;
    padding: 0;
    margin: 0;
    min-height: 100%;
  }

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

  .header {
    text-align: center;
    padding: 3rem 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/sample3.png') center/cover no-repeat;
    opacity: 0.1;
    z-index: -1;
  }

  .header h1 {
    font-family: 'Georgia', serif;
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    position: relative;
    display: inline-block;
  }

  .header h1::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: var(--accent);
    border-radius: 3px;
  }

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

  .design-reference {
    background: rgba(255, 255, 255, 0.9);
    padding: 1rem;
    border-radius: var(--border-radius);
    margin: 2rem auto;
    max-width: 600px;
    text-align: center;
    box-shadow: var(--shadow);
    font-weight: bold;
    color: var(--primary);
  }

  article {
    background: rgba(255, 255, 255, 0.85);
    border-radius: var(--border-radius);
    padding: 3rem;
    margin: 2rem 0;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
  }

  article h2 {
    font-family: 'Georgia', serif;
    color: var(--primary);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--secondary);
    border-radius: 3px;
  }

  article h3 {
    font-family: 'Georgia', serif;
    color: var(--primary);
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
  }

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

  article img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin: 1.5rem 0;
    transition: var(--transition);
  }

  article img:hover {
    transform: scale(1.02);
  }

  pre {
    background: rgba(0, 0, 0, 0.05);
    border-radius: var(--border-radius);
    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: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--secondary);
    border-radius: var(--border-radius) 0 0 var(--border-radius);
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(0, 0, 0, 0.05);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9rem;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
  }

  th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  }

  th {
    background: var(--secondary);
    color: white;
    font-weight: bold;
  }

  tr:hover {
    background: rgba(0, 0, 0, 0.02);
  }

  ol, ul {
    margin: 1.5rem 0;
    padding-left: 2rem;
  }

  li {
    margin-bottom: 0.5rem;
  }

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

  .image-grid img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: var(--transition);
  }

  .image-grid img:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
  }

  .nav-tabs {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
    flex-wrap: wrap;
  }

  .nav-tabs a {
    padding: 0.8rem 1.5rem;
    margin: 0.5rem;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 30px;
    text-decoration: none;
    color: var(--primary);
    font-weight: bold;
    transition: var(--transition);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  }

  .nav-tabs a:hover {
    background: var(--secondary);
    color: white;
    transform: translateY(-2px);
  }

  @media (max-width: 768px) {
    .container {
      padding: 1rem;
    }
    
    article {
      padding: 1.5rem;
    }
    
    .header h1 {
      font-size: 2rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  /* Animation classes */
  .fade-in {
    animation: fadeIn 1s ease-in;
  }

  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }

  .float {
    animation: float 6s ease-in-out infinite;
  }

  @keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
  }