:root {
    --primary-color: #0072C6;
    --secondary-color: #F5F7FA;
    --accent-color: #FFA500;
    --text-color: #333;
    --light-color: #fff;
    --dark-color: #1E1E1E;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
  }

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

  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: linear-gradient(135deg, var(--secondary-color), #E3E9EF);
    padding-top: 80px;
  }

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

  .header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(90deg, var(--primary-color), #005A9C);
    color: var(--light-color);
    padding: 15px 0;
    box-shadow: var(--shadow);
    z-index: 1000;
    display: flex;
    justify-content: center;
  }

  .header-content {
    width: 100%;
    max-width: 1200px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
  }

  .logo {
    font-size: 24px;
    font-weight: bold;
    letter-spacing: 1px;
  }

  .notice {
    background-color: var(--accent-color);
    color: var(--light-color);
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 14px;
    box-shadow: 0 2px 10px rgba(255, 165, 0, 0.3);
  }

  .hero {
    padding: 60px 0;
    text-align: center;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat right center/contain;
    min-height: 300px;
    margin-bottom: 40px;
  }

  .hero h1 {
    font-size: 42px;
    color: var(--primary-color);
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  }

  .hero p {
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto 30px;
  }

  .content-section {
    background-color: var(--light-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 40px;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
  }

  .content-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
  }

  h2 {
    color: var(--primary-color);
    font-size: 28px;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 10px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
  }

  h3 {
    color: var(--primary-color);
    font-size: 22px;
    margin: 25px 0 15px;
  }

  p {
    margin-bottom: 20px;
    font-size: 16px;
  }

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

  .image-card {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
  }

  pre {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    border-left: 4px solid var(--primary-color);
  }

  code {
    font-family: 'Courier New', Courier, monospace;
    background: rgba(0, 114, 198, 0.1);
    padding: 2px 4px;
    border-radius: 4px;
    color: #d63384;
  }

  .nav-links {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 100;
  }

  .nav-link {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
  }

  .nav-link:hover {
    background: var(--accent-color);
    transform: scale(1.1);
  }

  .footer {
    text-align: center;
    padding: 30px 0;
    background: linear-gradient(90deg, var(--primary-color), #005A9C);
    color: var(--light-color);
    margin-top: 60px;
  }

  @media (max-width: 768px) {
    .hero {
      background-size: 200px;
      background-position: center bottom;
      padding-bottom: 200px;
    }
    
    .hero h1 {
      font-size: 32px;
    }
    
    .content-section {
      padding: 30px 20px;
    }
    
    .nav-links {
      display: none;
    }
  }