:root {
    --primary: #2c3e50;
    --secondary: #34495e;
    --accent: #3498db;
    --text: #ecf0f1;
    --light: #bdc3c7;
    --dark: #1a252f;
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, var(--dark), var(--primary));
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  .header {
    text-align: center;
    padding: 40px 0;
    position: relative;
    overflow: hidden;
  }

  .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: 0.1;
    z-index: -1;
  }

  h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--accent), #fff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
  }

  .notice {
    background: rgba(255,255,255,0.1);
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 4px solid var(--accent);
    font-size: 0.9rem;
  }

  article {
    background: rgba(44, 62, 80, 0.8);
    border-radius: 12px;
    padding: 30px;
    margin: 30px 0;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  }

  h2 {
    font-size: 1.8rem;
    margin: 30px 0 20px;
    color: var(--accent);
    position: relative;
    padding-bottom: 10px;
  }

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

  h3 {
    font-size: 1.5rem;
    margin: 25px 0 15px;
    color: var(--light);
  }

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

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

  .image-card {
    background: var(--secondary);
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
  }

  .image-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
  }

  .image-caption {
    padding: 15px;
    font-size: 0.9rem;
  }

  pre {
    background: #1a252f;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow: auto;
    border-left: 4px solid var(--accent);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #f8f8f2;
    font-size: 0.9rem;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: var(--secondary);
    border-radius: 8px;
    overflow: hidden;
  }

  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  th {
    background: rgba(52, 152, 219, 0.2);
    color: var(--accent);
  }

  tr:hover {
    background: rgba(255,255,255,0.05);
  }

  .nav-tabs {
    display: flex;
    justify-content: center;
    margin: 30px 0;
    background: var(--secondary);
    border-radius: 8px;
    overflow: hidden;
  }

  .nav-tab {
    padding: 15px 25px;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    color: var(--light);
  }

  .nav-tab.active {
    color: var(--accent);
    background: rgba(52, 152, 219, 0.1);
  }

  .nav-tab:hover {
    color: var(--text);
  }

  .nav-tab.active::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent);
  }

  .tab-content {
    display: none;
    animation: fadeIn 0.5s;
  }

  .tab-content.active {
    display: block;
  }

  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }

  .data-flow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    opacity: 0.1;
  }

  .flow-line {
    position: absolute;
    width: 2px;
    height: 100px;
    background: var(--accent);
    animation: flow 15s linear infinite;
  }

  @keyframes flow {
    0% {
      transform: translateX(-10%) translateY(-100%);
    }
    100% {
      transform: translateX(110%) translateY(100%);
    }
  }

  footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.9rem;
    color: var(--light);
  }

  @media (max-width: 768px) {
    h1 {
      font-size: 2rem;
    }
    
    h2 {
      font-size: 1.5rem;
    }
    
    h3 {
      font-size: 1.3rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
    
    .nav-tabs {
      flex-direction: column;
    }
  }