:root {
    --primary-70: #D2B48C;
    --primary-25: #B87333;
    --accent-5: #FFD700;
    --secondary-blue: #1E90FF;
    --secondary-orange: #FFA500;
    --dark-text: #333;
    --light-text: #F5F5F5;
    --transition: all 0.3s ease;
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    color: var(--dark-text);
    background: linear-gradient(135deg, #F5DEB3, #D2B48C);
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  .header {
    text-align: center;
    padding: 40px 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') center/cover no-repeat;
    opacity: 0.1;
    z-index: -1;
  }

  h1, h2, h3, h4 {
    font-family: 'Baskerville', serif;
    margin-bottom: 1.5rem;
    color: var(--dark-text);
    position: relative;
  }

  h2::after {
    content: '';
    display: block;
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-25), var(--accent-5));
    margin: 10px 0 20px;
  }

  p {
    margin-bottom: 1.5rem;
    font-size: 17px;
  }

  .grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .card {
    background: rgba(255, 255, 255, 0.85);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
  }

  .card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-25), var(--accent-5));
  }

  .image-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin: 30px 0;
    justify-content: center;
  }

  .decorative-img {
    width: 150px;
    height: 150px;
    border-radius: 10px;
    object-fit: cover;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    filter: sepia(20%) brightness(0.9);
  }

  .decorative-img:hover {
    transform: scale(1.05);
    filter: sepia(0%) brightness(1);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
  }

  pre {
    background: rgba(0, 0, 0, 0.05);
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 25px 0;
    font-family: 'Courier New', monospace;
    border-left: 4px solid var(--primary-25);
  }

  code {
    color: var(--primary-25);
    font-family: 'Courier New', monospace;
  }

  .highlight {
    color: var(--accent-5);
    background-color: var(--primary-25);
    padding: 2px 5px;
    border-radius: 3px;
  }

  .accent {
    color: var(--secondary-blue);
    background-color: var(--secondary-orange);
    padding: 2px 5px;
    border-radius: 3px;
  }

  .nav-container {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(210, 180, 140, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    padding: 15px 40px;
    backdrop-filter: blur(5px);
  }

  .nav-links {
    display: flex;
    gap: 25px;
  }

  .nav-links a {
    color: var(--dark-text);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 5px 0;
  }

  .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-5);
    transition: var(--transition);
  }

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

  .nav-links a:hover {
    color: var(--accent-5);
  }

  .content-wrapper {
    padding-top: 80px;
  }

  .notice {
    background: rgba(255, 255, 255, 0.9);
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: center;
    border-left: 4px solid var(--accent-5);
    font-style: italic;
  }

  @media (max-width: 768px) {
    .grid-layout {
      grid-template-columns: 1fr;
    }
    
    .nav-container {
      flex-direction: column;
      align-items: center;
      gap: 15px;
      padding: 15px;
    }
    
    .nav-links {
      flex-wrap: wrap;
      justify-content: center;
    }
    
    .content-wrapper {
      padding-top: 120px;
    }
  }

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

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

  .section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-25), transparent);
    margin: 50px 0;
  }