:root {
    --bg-color: #121212; /* 深黑色背景 */
    --deep-blue: #0d1b2a;
    --purple: #8e44ad;
    --neon-green: #4CBB17;
    --electric-purple: #BF00FF;
    --text-color: #ffffff;
    --accent-gradient: linear-gradient(90deg, #4CBB17, #8E44AD);
    --font-primary: 'Roboto Mono', monospace;
    --font-secondary: 'Fira Code', monospace;
    --transition-speed: 0.3s;
    --code-bg: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.2);
  }

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

  body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-primary);
    line-height: 1.6;
    padding: 20px;
    background-image: url('https://images.gptkong.com/demo/sample1.png'), url('https://images.gptkong.com/demo/sample2.png'), url('https://images.gptkong.com/demo/sample3.png');
    background-position: top left, bottom right, center;
    background-repeat: no-repeat, no-repeat, no-repeat;
    background-size: 200px 200px, 150px 150px, cover;
  }

  header {
    text-align: center;
    padding: 40px 0;
    background: var(--deep-blue);
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px var(--shadow-color);
  }

  header h1 {
    font-size: 2.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: glow 5s infinite alternate;
  }

  @keyframes glow {
    from {
      text-shadow: 0 0 10px var(--neon-green), 0 0 20px var(--electric-purple);
    }
    to {
      text-shadow: 0 0 20px var(--electric-purple), 0 0 30px var(--neon-green);
    }
  }

  main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .section {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px var(--shadow-color);
  }

  .section h2, .section h3, .section h4 {
    color: var(--neon-green);
    margin-bottom: 15px;
  }

  .section h2 {
    font-size: 2rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .section h3 {
    font-size: 1.5rem;
  }

  .section h4 {
    font-size: 1.2rem;
  }

  p {
    margin-bottom: 15px;
  }

  pre {
    background: var(--code-bg);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    font-family: var(--font-secondary);
    color: #00ff00;
    margin-bottom: 15px;
  }

  code {
    font-family: var(--font-secondary);
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 15px;
  }

  table, th, td {
    border: 1px solid var(--neon-green);
  }

  th, td {
    padding: 10px;
    text-align: left;
  }

  th {
    background: var(--electric-purple);
  }

  a {
    color: var(--neon-green);
    text-decoration: none;
    transition: color var(--transition-speed);
  }

  a:hover {
    color: var(--electric-purple);
  }

  .button {
    background-color: var(--neon-green);
    color: var(--text-color);
    padding: 10px 20px;
    border: none;
    cursor: pointer;
    transition: background-color var(--transition-speed);
    border-radius: 5px;
  }

  .button:hover {
    background-color: #3e8e41;
  }

  .particle {
    position: absolute;
    width: 10px;
    height: 10px;
    background-color: var(--neon-green);
    border-radius: 50%;
    animation: move 5s infinite;
  }

  @keyframes move {
    0% { transform: translate(0, 0); }
    50% { transform: translate(100px, -100px); }
    100% { transform: translate(0, 0); }
  }

  svg.icon {
    fill: currentColor;
    transition: transform var(--transition-speed);
    width: 24px;
    height: 24px;
  }

  svg.icon:hover {
    transform: scale(1.2);
  }

  footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 20px;
    background: var(--deep-blue);
    border-radius: 10px;
    box-shadow: 0 4px 6px var(--shadow-color);
  }

  /* Responsive Design */
  @media (min-width: 320px) and (max-width: 479px) {
    header h1 {
      font-size: 1.8rem;
    }
    .section h2 {
      font-size: 1.5rem;
    }
    .section h3 {
      font-size: 1.2rem;
    }
    .section p, table, pre {
      font-size: 0.9rem;
    }
  }

  @media (min-width: 480px) and (max-width: 767px) {
    header h1 {
      font-size: 2rem;
    }
    .section h2 {
      font-size: 1.8rem;
    }
    .section h3 {
      font-size: 1.3rem;
    }
    .section p, table, pre {
      font-size: 1rem;
    }
  }

  @media (min-width: 768px) and (max-width: 1023px) {
    main {
      grid-template-columns: 1fr 1fr;
    }
    header h1 {
      font-size: 2.5rem;
    }
    .section h2 {
      font-size: 2rem;
    }
    .section h3 {
      font-size: 1.5rem;
    }
    .section p, table, pre {
      font-size: 1.1rem;
    }
  }

  @media (min-width: 1024px) and (max-width: 1199px) {
    main {
      grid-template-columns: 1fr 1fr 1fr;
    }
    header h1 {
      font-size: 3rem;
    }
    .section h2 {
      font-size: 2.5rem;
    }
    .section h3 {
      font-size: 1.7rem;
    }
    .section p, table, pre {
      font-size: 1.2rem;
    }
  }

  @media (min-width: 1200px) and (max-width: 1439px) {
    main {
      grid-template-columns: 1fr 1fr 1fr 1fr;
    }
    header h1 {
      font-size: 3.5rem;
    }
    .section h2 {
      font-size: 3rem;
    }
    .section h3 {
      font-size: 2rem;
    }
    .section p, table, pre {
      font-size: 1.3rem;
    }
  }

  @media (min-width: 1440px) {
    main {
      grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
    }
    header h1 {
      font-size: 4rem;
    }
    .section h2 {
      font-size: 3.5rem;
    }
    .section h3 {
      font-size: 2.2rem;
    }
    .section p, table, pre {
      font-size: 1.4rem;
    }
  }