:root {
    --primary-color: #4facfe;
    --secondary-color: #00f2fe;
    --accent-color: #ee0979;
    --background-color: rgba(255, 255, 255, 0.3);
    --text-color: #2c3e50;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --border-radius: 12px;
    --box-shadow: 0 8px 32px rgba(31, 38, 135, 0.2);
    --transition: all 0.3s ease;
  }

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

  body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    color: var(--text-color);
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden;
  }

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

  .header {
    position: relative;
    height: 80vh;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    overflow: hidden;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 60px;
  }

  .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: 0;
  }

  .header-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 40px;
    max-width: 800px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    animation: fadeInUp 1s ease;
  }

  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  }

  .tagline {
    font-size: 1.2rem;
    color: white;
    margin-bottom: 30px;
    opacity: 0.9;
  }

  .notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.9);
    padding: 10px 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    z-index: 100;
    font-size: 0.9rem;
  }

  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  }

  .navbar.scrolled {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  }

  .nav-links {
    display: flex;
    gap: 30px;
  }

  .nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
  }

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

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

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

  article {
    background: white;
    padding: 60px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 60px;
    position: relative;
  }

  article::before {
    content: '';
    position: absolute;
    top: 20px;
    right: 20px;
    width: 100px;
    height: 100px;
    background: url('https://images.gptkong.com/demo/sample2.png') center/cover no-repeat;
    opacity: 0.1;
    z-index: 0;
  }

  h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 10px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
  }

  h3 {
    font-size: 1.5rem;
    margin: 40px 0 20px;
    color: var(--secondary-color);
  }

  p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.8;
  }

  pre {
    background: rgba(0, 0, 0, 0.05);
    padding: 20px;
    border-radius: var(--border-radius);
    margin: 30px 0;
    overflow-x: auto;
    position: relative;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.1);
  }

  code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: #333;
  }

  .code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
  }

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

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

  .image-card {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
  }

  .image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
  }

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

  .image-card:hover img {
    transform: scale(1.05);
  }

  .image-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 15px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    color: white;
    font-weight: 500;
  }

  .cta-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 80px 0;
    text-align: center;
    border-radius: var(--border-radius);
    margin: 60px 0;
    position: relative;
    overflow: hidden;
  }

  .cta-section::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: 0;
  }

  .cta-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .cta-title {
    font-size: 2.5rem;
    color: white;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  }

  .cta-text {
    font-size: 1.2rem;
    color: white;
    margin-bottom: 30px;
    opacity: 0.9;
  }

  .cta-button {
    display: inline-block;
    background: white;
    color: var(--primary-color);
    padding: 15px 40px;
    border-radius: 50px;
    font-weight: bold;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  }

  .cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    background: var(--accent-color);
    color: white;
  }

  .footer {
    background: var(--dark-color);
    color: white;
    padding: 60px 0 30px;
    text-align: center;
  }

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

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin: 30px 0;
  }

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

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

  .copyright {
    opacity: 0.7;
    font-size: 0.9rem;
    margin-top: 30px;
  }

  @media (max-width: 768px) {
    .header {
      height: 60vh;
    }

    h1 {
      font-size: 2rem;
    }

    .tagline {
      font-size: 1rem;
    }

    .nav-links {
      gap: 15px;
    }

    article {
      padding: 30px;
    }

    h2 {
      font-size: 1.5rem;
    }

    h3 {
      font-size: 1.3rem;
    }

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

  @media (max-width: 480px) {
    .header {
      height: 50vh;
    }

    .header-content {
      padding: 20px;
    }

    .navbar {
      padding: 10px 15px;
    }

    .nav-links {
      display: none;
    }

    article {
      padding: 20px;
    }
  }