:root {
    --primary: #A884F2;
    --secondary: #87CEEB;
    --accent: #FFD700;
    --highlight: #FFA500;
    --text: #333;
    --light: #fff;
    --dark: #1a1a2e;
    --radius: 12px;
    --shadow: 0 8px 24px rgba(0,0,0,0.12);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', system-ui, -apple-system, sans-serif;
  }

  body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    color: var(--text);
    line-height: 1.6;
    padding: 0;
    margin: 0;
    overflow-x: hidden;
    min-height: 100%;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
  }

  header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 2rem 0;
    text-align: center;
    margin-bottom: 3rem;
    border-radius: 0 0 var(--radius) var(--radius);
    box-shadow: var(--shadow);
    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: 0.15;
    z-index: 0;
  }

  header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
  }

  .tagline {
    font-size: 1.2rem;
    opacity: 0.9;
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
  }

  .reference-note {
    background: var(--light);
    color: var(--text);
    padding: 1rem;
    border-radius: var(--radius);
    margin: 2rem auto;
    max-width: 800px;
    text-align: center;
    box-shadow: var(--shadow);
    font-weight: 500;
  }

  article {
    background: var(--light);
    border-radius: var(--radius);
    padding: 3rem;
    margin-bottom: 3rem;
    box-shadow: var(--shadow);
    position: relative;
  }

  article::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 150px;
    height: 150px;
    background: url('https://images.gptkong.com/demo/sample2.png') center/contain no-repeat;
    opacity: 0.1;
    z-index: 0;
  }

  article h2 {
    color: var(--primary);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
  }

  article h3 {
    color: var(--secondary);
    font-size: 1.4rem;
    margin: 2rem 0 1rem;
    position: relative;
    z-index: 1;
  }

  article p {
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
    font-size: 1.05rem;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .image-card {
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 28px rgba(0,0,0,0.15);
  }

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

  .image-card .caption {
    padding: 1rem;
    font-size: 0.9rem;
    color: var(--text);
  }

  pre {
    background: var(--dark);
    color: #f8f8f2;
    padding: 1.5rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 2rem 0;
    font-size: 0.95rem;
    box-shadow: var(--shadow);
    position: relative;
    z-index: 1;
  }

  code {
    font-family: 'Fira Code', monospace;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    box-shadow: var(--shadow);
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
    z-index: 1;
  }

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

  th {
    background: var(--primary);
    color: white;
    font-weight: 500;
  }

  tr:nth-child(even) {
    background: rgba(168, 132, 242, 0.05);
  }

  tr:hover {
    background: rgba(168, 132, 242, 0.1);
  }

  .floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
  }

  .floating-element {
    position: absolute;
    background: url('https://images.gptkong.com/demo/sample3.png') center/contain no-repeat;
    width: 80px;
    height: 80px;
    opacity: 0.1;
    animation: float 15s infinite linear;
  }

  @keyframes float {
    0% {
      transform: translate(0, 0) rotate(0deg);
    }
    25% {
      transform: translate(50px, 50px) rotate(90deg);
    }
    50% {
      transform: translate(100px, 0) rotate(180deg);
    }
    75% {
      transform: translate(50px, -50px) rotate(270deg);
    }
    100% {
      transform: translate(0, 0) rotate(360deg);
    }
  }

  .nav-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    position: sticky;
    top: 0;
    background: white;
    z-index: 100;
    padding: 1rem 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  }

  .nav-tab {
    padding: 0.75rem 1.5rem;
    margin: 0 0.5rem;
    border-radius: 50px;
    background: transparent;
    color: var(--text);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
  }

  .nav-tab:hover {
    background: rgba(168, 132, 242, 0.1);
    color: var(--primary);
  }

  .nav-tab.active {
    background: var(--primary);
    color: white;
  }

  footer {
    text-align: center;
    padding: 2rem;
    color: var(--text);
    font-size: 0.9rem;
    opacity: 0.7;
  }

  @media (max-width: 768px) {
    .container {
      padding: 1rem;
    }
    
    article {
      padding: 2rem 1.5rem;
    }
    
    header h1 {
      font-size: 2rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }