:root {
    --primary-color: #1E272E;
    --secondary-color: #808E9B;
    --accent-color: #03A9F4;
    --highlight-color: #AB47BC;
    --button-color: #FFA726;
    --text-light: #FFFFFF;
    --text-dark: #1E272E;
    --card-bg: linear-gradient(135deg, #2C3A47, #1B263B);
    --section-padding: 80px 0;
    --max-width: 1200px;
    --border-radius: 12px;
    --box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
  }

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

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

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

  .header {
    position: relative;
    padding: 40px 0;
    text-align: center;
    background: linear-gradient(135deg, rgba(30, 39, 46, 0.9), rgba(30, 39, 46, 0.7));
    z-index: 10;
  }

  .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: 0.15;
    z-index: -1;
  }

  .header h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--accent-color), var(--highlight-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  }

  .header p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 30px;
    color: var(--secondary-color);
  }

  .notice {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: var(--border-radius);
    margin: 20px auto;
    max-width: 800px;
    text-align: center;
    border-left: 4px solid var(--accent-color);
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(3, 169, 244, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(3, 169, 244, 0); }
    100% { box-shadow: 0 0 0 0 rgba(3, 169, 244, 0); }
  }

  .article-container {
    padding: var(--section-padding);
    position: relative;
  }

  .article-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample2.png') right bottom/200px no-repeat,
                url('https://images.gptkong.com/demo/sample3.png') left top/150px no-repeat;
    opacity: 0.1;
    z-index: -1;
  }

  article {
    background: rgba(30, 39, 46, 0.7);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    backdrop-filter: blur(10px);
    margin-bottom: 60px;
  }

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

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--highlight-color));
  }

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

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

  article span {
    color: var(--highlight-color);
    font-weight: bold;
  }

  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--border-radius);
    padding: 20px;
    margin: 25px 0;
    overflow: auto;
    border-left: 4px solid var(--accent-color);
    position: relative;
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent-color);
    color: white;
    padding: 2px 10px;
    font-size: 0.8rem;
    border-bottom-left-radius: var(--border-radius);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #FFD700;
  }

  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.3s;
  }

  .gallery-item:hover {
    transform: translateY(-10px);
  }

  .gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s;
  }

  .gallery-item:hover img {
    transform: scale(1.1);
  }

  .gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 15px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    color: white;
  }

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

  .feature-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.3s;
    position: relative;
    overflow: hidden;
  }

  .feature-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(3, 169, 244, 0.1), transparent);
    transform: rotate(45deg);
    transition: all 0.6s;
  }

  .feature-card:hover {
    transform: translateY(-10px);
  }

  .feature-card:hover::before {
    left: 100%;
  }

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

  .feature-card p {
    margin-bottom: 0;
  }

  .nav-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin: 40px 0;
  }

  .nav-link {
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 25px;
    color: var(--text-light);
    text-decoration: none;
    transition: all 0.3s;
    border: 1px solid var(--accent-color);
  }

  .nav-link:hover {
    background: var(--accent-color);
    color: var(--text-dark);
    transform: translateY(-3px);
  }

  footer {
    text-align: center;
    padding: 30px 0;
    background: rgba(0, 0, 0, 0.2);
    margin-top: 60px;
  }

  @media (max-width: 768px) {
    .header h1 {
      font-size: 2rem;
    }
    
    article {
      padding: 25px;
    }
    
    article h2 {
      font-size: 1.7rem;
    }
    
    article h3 {
      font-size: 1.3rem;
    }
    
    .features-grid {
      grid-template-columns: 1fr;
    }
    
    .image-gallery {
      grid-template-columns: 1fr;
    }
  }

  @media (max-width: 480px) {
    .header h1 {
      font-size: 1.8rem;
    }
    
    article {
      padding: 20px;
    }
    
    .nav-links {
      flex-direction: column;
      align-items: center;
    }
  }