@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@600;700&family=Roboto:wght@400;500&display=swap');
  
  :root {
    --primary: #1E3A8A;
    --secondary: #6D28D9;
    --accent: #10B981;
    --light: #F5F5F7;
    --dark: #1F2937;
    --gray: #9CA3AF;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, #F9FAFB 0%, #E5E7EB 100%);
    overflow-x: hidden;
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }
  
  .hero {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(45deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
    margin-bottom: 80px;
    overflow: hidden;
  }
  
  .hero::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: 0;
  }
  
  .hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 20px;
  }
  
  .hero h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
  }
  
  .hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
  }
  
  .notice {
    background-color: var(--light);
    padding: 15px;
    border-radius: 8px;
    margin: 30px 0;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border-left: 4px solid var(--accent);
  }
  
  article {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    padding: 40px;
    margin-bottom: 60px;
  }
  
  article h2 {
    font-family: 'Montserrat', sans-serif;
    color: var(--primary);
    font-size: 2.2rem;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 15px;
  }
  
  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
  }
  
  article h3 {
    font-family: 'Montserrat', sans-serif;
    color: var(--secondary);
    font-size: 1.8rem;
    margin: 30px 0 20px;
  }
  
  article p {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--dark);
  }
  
  pre {
    background: #1E1E1E;
    border-radius: 8px;
    padding: 20px;
    margin: 25px 0;
    overflow: auto;
    position: relative;
  }
  
  code {
    font-family: 'Roboto Mono', monospace;
    color: #D4D4D4;
    font-size: 0.9rem;
  }
  
  .code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #252526;
    padding: 8px 15px;
    border-radius: 8px 8px 0 0;
    margin-bottom: -20px;
    position: relative;
    z-index: 1;
  }
  
  .code-header span {
    color: #9CDCFE;
    font-size: 0.85rem;
  }
  
  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin: 40px 0;
  }
  
  .image-card {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    position: relative;
  }
  
  .image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
  }
  
  .image-card img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
  }
  
  .image-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(30,58,138,0.3), rgba(109,40,217,0.3));
    opacity: 0;
    transition: opacity 0.3s;
  }
  
  .image-card:hover::after {
    opacity: 1;
  }
  
  .nav-tabs {
    display: flex;
    margin-bottom: 30px;
    border-bottom: 1px solid #E5E7EB;
  }
  
  .nav-tab {
    padding: 12px 25px;
    cursor: pointer;
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    color: var(--gray);
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
  }
  
  .nav-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
  }
  
  .nav-tab:hover {
    color: var(--secondary);
  }
  
  .footer {
    background: linear-gradient(45deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 50px 0;
    text-align: center;
    clip-path: polygon(0 10%, 100% 0, 100% 100%, 0 100%);
    margin-top: 80px;
  }
  
  .footer p {
    margin-top: 20px;
    opacity: 0.8;
  }
  
  @media (max-width: 768px) {
    .hero h1 {
      font-size: 2.2rem;
    }
    
    article {
      padding: 25px;
    }
    
    article h2 {
      font-size: 1.8rem;
    }
    
    article h3 {
      font-size: 1.5rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }