:root {
    --main-dark-blue: #032B44;
    --main-indigo: #1E3A8A;
    --accent-bright-blue: #4F9AE6;
    --accent-cyan-green: #7CDFA6;
    --neutral-light: #F5F5F5;
    --neutral-dark: #888888;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

  body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    color: var(--main-dark-blue);
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    padding-top: 80px;
  }

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

  .header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(90deg, var(--main-dark-blue) 0%, var(--main-indigo) 100%);
    color: white;
    padding: 20px 0;
    box-shadow: var(--shadow);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .header-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-left: 20px;
    background: linear-gradient(to right, #fff 0%, var(--accent-cyan-green) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .notice {
    background: var(--accent-cyan-green);
    color: white;
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 0.9rem;
    margin-right: 20px;
    box-shadow: 0 4px 15px rgba(79, 154, 230, 0.3);
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
  }

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

  .hero-content {
    max-width: 600px;
    background: rgba(255, 255, 255, 0.9);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
  }

  .hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--main-dark-blue);
    background: linear-gradient(to right, var(--main-dark-blue) 0%, var(--accent-bright-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero p {
    font-size: 1.1rem;
    color: var(--neutral-dark);
    margin-bottom: 20px;
  }

  article {
    background: white;
    border-radius: 10px;
    padding: 40px;
    margin-bottom: 60px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
  }

  article::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent-bright-blue), var(--accent-cyan-green));
  }

  h2 {
    font-size: 2rem;
    margin: 30px 0 20px;
    color: var(--main-indigo);
    position: relative;
    padding-left: 20px;
  }

  h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--accent-cyan-green);
    border-radius: 50%;
  }

  h3 {
    font-size: 1.5rem;
    margin: 25px 0 15px;
    color: var(--main-dark-blue);
    position: relative;
    padding-left: 15px;
  }

  h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--accent-bright-blue);
    border-radius: 50%;
  }

  p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: var(--neutral-dark);
    line-height: 1.8;
  }

  strong {
    color: var(--main-dark-blue);
    font-weight: 600;
  }

  pre {
    background: #f8f9fa;
    border-left: 4px solid var(--accent-bright-blue);
    border-radius: 0 5px 5px 0;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
    color: #333;
  }

  code {
    background: rgba(79, 154, 230, 0.1);
    padding: 2px 5px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--accent-bright-blue);
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    box-shadow: 0 2px 3px rgba(0,0,0,0.1);
  }

  th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #ddd;
  }

  th {
    background-color: var(--main-dark-blue);
    color: white;
    font-weight: 600;
  }

  tr:nth-child(even) {
    background-color: #f9f9f9;
  }

  tr:hover {
    background-color: rgba(79, 154, 230, 0.05);
  }

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

  .image-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: var(--transition);
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
  }

  .image-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid #eee;
  }

  .image-card .caption {
    padding: 15px;
    font-size: 0.9rem;
    color: var(--neutral-dark);
  }

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

  .nav-link {
    background: white;
    color: var(--main-dark-blue);
    padding: 10px 20px;
    margin: 0 10px 10px 0;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: var(--transition);
  }

  .nav-link:hover {
    background: var(--accent-bright-blue);
    color: white;
    transform: translateY(-2px);
  }

  .footer {
    text-align: center;
    padding: 30px 0;
    color: var(--neutral-dark);
    font-size: 0.9rem;
  }

  @media (max-width: 768px) {
    .header {
      flex-direction: column;
      padding: 15px 0;
    }
    
    .header-title {
      margin: 0 0 15px 0;
    }
    
    .notice {
      margin: 0;
    }
    
    .hero {
      background-position: center;
      background-size: cover;
    }
    
    .hero-content {
      max-width: 100%;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }