:root {
    --primary-color: #1E90FF;
    --accent-orange: #FFA500;
    --accent-green: #28A745;
    --background-light: #ECF0F1;
    --dark-gray: #2C3E50;
    --light-gray: #f5f7fa;
    --text-color: #333;
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 8px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

  body {
    font-family: 'Roboto', 'Helvetica', Arial, sans-serif;
    background-color: var(--background-light);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 20px 40px;
  }

  .hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--dark-gray) 100%);
    padding: 80px 20px;
    text-align: center;
    color: white;
    margin-bottom: 60px;
    border-radius: 0 0 20px 20px;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover;
    opacity: 0.1;
  }

  .hero h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    position: relative;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  }

  .hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 30px;
    position: relative;
  }

  .notice {
    background-color: rgba(255, 255, 255, 0.2);
    padding: 15px;
    border-radius: 8px;
    display: inline-block;
    margin-top: 30px;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.3);
  }

  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(30, 144, 255, 0.95);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    backdrop-filter: blur(10px);
  }

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

  .nav-links a {
    color: white;
    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-color: var(--accent-orange);
    transition: var(--transition);
  }

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

  article {
    background-color: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 60px;
  }

  article h2 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 15px;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-orange));
    border-radius: 2px;
  }

  article h3 {
    color: var(--dark-gray);
    font-size: 1.5rem;
    margin: 30px 0 20px;
  }

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

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

  .card {
    background-color: white;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
  }

  .card-img {
    height: 200px;
    background-size: cover;
    background-position: center;
  }

  .card-content {
    padding: 20px;
  }

  .card-content h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
  }

  pre {
    background-color: var(--dark-gray);
    color: white;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
    font-family: 'Courier New', monospace;
    box-shadow: var(--shadow-sm);
  }

  code {
    font-family: 'Courier New', monospace;
    background-color: rgba(30, 144, 255, 0.1);
    padding: 2px 5px;
    border-radius: 3px;
    color: var(--primary-color);
  }

  .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .gallery img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
  }

  .gallery img:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
  }

  .footer {
    background-color: var(--dark-gray);
    color: white;
    padding: 40px 20px;
    text-align: center;
    margin-top: 60px;
  }

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

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

  .footer-links a:hover {
    color: var(--accent-orange);
  }

  @media (max-width: 768px) {
    .hero h1 {
      font-size: 2rem;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    article {
      padding: 30px 20px;
    }
    
    .card-container {
      grid-template-columns: 1fr;
    }
  }