@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;700&family=Roboto:wght@300;400;500&display=swap');

  :root {
    --primary-1: #A89F91;
    --primary-2: #5D534A;
    --secondary-1: #D6CFC7;
    --secondary-2: #B7410E;
    --accent: #2E2E5C;
    --text: #333;
    --light: #F5F5F5;
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    color: var(--text);
    line-height: 1.6;
    background: linear-gradient(135deg, var(--secondary-1), white);
    padding: 0;
    max-width: 100vw;
    overflow-x: hidden;
  }

  .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
  }

  header {
    background: linear-gradient(to right, var(--primary-2), var(--accent));
    color: white;
    padding: 30px 0;
    text-align: center;
    margin-bottom: 40px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    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;
    opacity: 0.1;
  }

  h1, h2, h3, h4 {
    font-family: 'Playfair Display', serif;
    margin-bottom: 20px;
    color: var(--primary-2);
  }

  h1 {
    font-size: 2.5rem;
    position: relative;
    display: inline-block;
  }

  h1::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(to right, var(--secondary-2), var(--accent));
  }

  h2 {
    font-size: 2rem;
    margin-top: 40px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-1);
  }

  h3 {
    font-size: 1.5rem;
    margin-top: 30px;
    color: var(--accent);
  }

  p {
    margin-bottom: 20px;
    font-size: 1.1rem;
  }

  .reference-banner {
    background: var(--secondary-2);
    color: white;
    padding: 15px;
    text-align: center;
    font-weight: bold;
    margin-bottom: 30px;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  }

  article {
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    margin-bottom: 40px;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }

  .decorative-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .decorative-image:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
  }

  pre {
    background: #f8f8f8;
    padding: 20px;
    border-radius: 6px;
    overflow-x: auto;
    margin: 20px 0;
    border-left: 4px solid var(--secondary-2);
    font-family: 'Roboto Mono', monospace;
    font-size: 0.9rem;
    position: relative;
  }

  pre::before {
    content: "CSS";
    position: absolute;
    top: 0;
    right: 0;
    background: var(--secondary-2);
    color: white;
    padding: 2px 8px;
    font-size: 0.8rem;
    border-bottom-left-radius: 4px;
  }

  code {
    font-family: 'Roboto Mono', monospace;
    background: rgba(183, 65, 14, 0.1);
    padding: 2px 4px;
    border-radius: 3px;
    color: var(--secondary-2);
  }

  .card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  }

  .card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
  }

  .card-content {
    padding: 20px;
  }

  .nav-tabs {
    display: flex;
    list-style: none;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--primary-1);
  }

  .nav-tabs li {
    margin-right: 15px;
  }

  .nav-tabs a {
    display: block;
    padding: 10px 15px;
    color: var(--text);
    text-decoration: none;
    position: relative;
    transition: color 0.3s ease;
  }

  .nav-tabs a:hover {
    color: var(--secondary-2);
  }

  .nav-tabs a.active {
    color: var(--secondary-2);
    font-weight: 500;
  }

  .nav-tabs a.active::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--secondary-2);
  }

  footer {
    background: var(--primary-2);
    color: white;
    padding: 30px 0;
    text-align: center;
    margin-top: 60px;
  }

  @media (max-width: 768px) {
    .container {
      padding: 15px;
    }
    
    article {
      padding: 25px;
    }
    
    h1 {
      font-size: 2rem;
    }
    
    h2 {
      font-size: 1.7rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

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

  .animate {
    animation: fadeIn 0.8s ease forwards;
  }

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

  /* Scroll indicator */
  .scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(to right, var(--secondary-2), var(--accent));
    z-index: 1000;
    transition: width 0.3s ease;
  }