:root {
    --primary: #1e3c72;
    --secondary: #2a5298;
    --accent: #6a11cb;
    --gold: #FFD700;
    --orange: #FFA500;
    --silver: #C0C0C0;
    --text: #f8f9fa;
    --bg: #0a192f;
    --card-bg: rgba(30, 60, 114, 0.7);
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Arial, sans-serif;
  }

  body {
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    padding: 0;
    margin: 0;
  }

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

  .header {
    text-align: center;
    padding: 40px 0;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 0 0 20px 20px;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
  }

  .header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample6.png') no-repeat center/cover;
    opacity: 0.1;
    z-index: 0;
  }

  .header h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    background: linear-gradient(90deg, var(--gold), var(--orange));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

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

  .notice {
    background: rgba(255, 215, 0, 0.2);
    border-left: 4px solid var(--gold);
    padding: 15px;
    margin: 20px 0;
    border-radius: 0 8px 8px 0;
    font-size: 0.9rem;
  }

  article {
    background: rgba(10, 25, 47, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  article h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--gold);
    position: relative;
    padding-bottom: 10px;
  }

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

  article h3 {
    font-size: 1.5rem;
    margin: 30px 0 15px;
    color: var(--silver);
  }

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

  article strong {
    color: var(--gold);
  }

  article span[style*="color: silver"] {
    color: var(--silver) !important;
  }

  article span[style*="color: gold"] {
    color: var(--gold) !important;
  }

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

  .image-card {
    background: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
  }

  .image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
  }

  .image-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .image-card .caption {
    padding: 15px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
  }

  pre {
    background: #0f1a2e;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    border-left: 4px solid var(--accent);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    color: #e6e6e6;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(106, 17, 203, 0.2);
    padding: 2px 5px;
    border-radius: 3px;
    color: #e6e6e6;
  }

  .nav-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin: 30px 0;
  }

  .nav-link {
    padding: 10px 20px;
    background: rgba(30, 60, 114, 0.5);
    border-radius: 30px;
    color: var(--text);
    text-decoration: none;
    transition: all 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
  }

  .nav-link:hover {
    background: var(--accent);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(106, 17, 203, 0.4);
  }

  .footer {
    text-align: center;
    padding: 30px;
    margin-top: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 20px 20px 0 0;
    position: relative;
  }

  .footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample12.png') no-repeat center/cover;
    opacity: 0.1;
    z-index: 0;
  }

  .footer p {
    position: relative;
    z-index: 1;
  }

  @media (max-width: 768px) {
    .header h1 {
      font-size: 2rem;
    }
    
    .header p {
      font-size: 1rem;
    }
    
    article {
      padding: 20px;
    }
    
    article h2 {
      font-size: 1.8rem;
    }
    
    article h3 {
      font-size: 1.3rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  /* Animations */
  @keyframes float {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-10px);
    }
  }

  .floating {
    animation: float 3s ease-in-out infinite;
  }

  @keyframes pulse {
    0%, 100% {
      opacity: 1;
    }
    50% {
      opacity: 0.5;
    }
  }

  .pulse {
    animation: pulse 2s ease-in-out infinite;
  }

  /* Additional decorative elements */
  .decorative-circle {
    position: absolute;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(106, 17, 203, 0.2), transparent 70%);
    z-index: -1;
  }

  .circle-1 {
    top: 10%;
    left: 5%;
  }

  .circle-2 {
    bottom: 15%;
    right: 5%;
  }

  /* Tooltip */
  .tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted var(--gold);
    cursor: help;
  }

  .tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: var(--primary);
    color: var(--text);
    text-align: center;
    border-radius: 6px;
    padding: 5px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.8rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  }

  .tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
  }