:root {
    --primary: #1A1A37;
    --secondary: #6527BE;
    --accent: #00FFD1;
    --light: #E0E0E0;
    --highlight: #38C172;
    --dark: #0A0A1A;
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    letter-spacing: 0.5px;
    color: var(--light);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    min-height: 100%;
    overflow-x: hidden;
  }

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

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

  .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: 0.2;
    z-index: -1;
    border-radius: 20px;
  }

  h1, h2, h3, h4 {
    font-family: 'Montserrat', sans-serif;
    margin-bottom: 20px;
    color: var(--light);
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
  }

  h1 {
    font-size: 2.5rem;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 30px;
  }

  h2 {
    font-size: 1.8rem;
    color: var(--accent);
    border-bottom: 2px solid var(--accent);
    padding-bottom: 10px;
    margin-top: 40px;
  }

  h3 {
    font-size: 1.5rem;
    color: var(--highlight);
    margin-top: 30px;
  }

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

  .card {
    background: rgba(43, 43, 80, 0.7);
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    border: 1px solid rgba(0, 255, 209, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.3);
  }

  pre {
    background: var(--dark);
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    overflow: auto;
    border-left: 4px solid var(--accent);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
  }

  code {
    color: var(--accent);
    font-family: 'Courier New', monospace;
  }

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

  .image-item {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transition: transform 0.3s ease;
  }

  .image-item:hover {
    transform: scale(1.03);
  }

  .image-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
  }

  .image-item:hover img {
    transform: scale(1.1);
  }

  .note {
    background: rgba(0, 255, 209, 0.1);
    border-left: 4px solid var(--accent);
    padding: 20px;
    margin: 20px 0;
    border-radius: 0 8px 8px 0;
  }

  .note p {
    margin: 0;
  }

  .nav-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin: 40px 0;
  }

  .nav-link {
    padding: 12px 25px;
    background: rgba(0, 255, 209, 0.1);
    border: 1px solid var(--accent);
    border-radius: 30px;
    color: var(--accent);
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
  }

  .nav-link:hover {
    background: var(--accent);
    color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 255, 209, 0.3);
  }

  .footer {
    text-align: center;
    padding: 30px;
    margin-top: 50px;
    background: rgba(10, 10, 26, 0.7);
    border-top: 1px solid rgba(0, 255, 209, 0.2);
  }

  .reference {
    font-size: 0.9rem;
    color: rgba(224, 224, 224, 0.7);
    margin-top: 20px;
  }

  @media (max-width: 768px) {
    h1 {
      font-size: 2rem;
    }
    h2 {
      font-size: 1.5rem;
    }
    h3 {
      font-size: 1.3rem;
    }
    .card {
      padding: 20px;
    }
  }

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

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