:root {
    --primary: #C6E2B5;
    --secondary: #F5DEB3;
    --accent: #489EB1;
    --highlight: #FFA500;
    --light: #FFFDD0;
    --dark: #333;
    --shadow: 0 4px 20px rgba(0,0,0,0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

  @font-face {
    font-family: 'Roboto';
    src: url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    overflow-x: hidden;
  }

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

  /* Header Styles */
  header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 2rem 0;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow);
  }

  header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat;
    background-size: cover;
    opacity: 0.1;
    z-index: 0;
  }

  .header-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem;
  }

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

  .header-content p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 2rem;
  }

  .notice {
    background: rgba(255,255,255,0.9);
    color: var(--dark);
    padding: 1rem;
    border-radius: 8px;
    display: inline-block;
    box-shadow: var(--shadow);
    margin-top: 2rem;
    font-weight: 500;
  }

  /* Navigation */
  nav {
    background: rgba(255,255,255,0.95);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(5px);
  }

  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
  }

  .nav-links {
    display: flex;
    list-style: none;
  }

  .nav-links li {
    margin-left: 2rem;
  }

  .nav-links a {
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: var(--transition);
    position: relative;
  }

  .nav-links a:hover {
    color: var(--accent);
  }

  .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
  }

  .nav-links a:hover::after {
    width: 100%;
    left: 0;
  }

  /* Main Content */
  main {
    padding: 3rem 0;
  }

  article {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 3rem;
    margin-bottom: 3rem;
  }

  article h2 {
    color: var(--accent);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
  }

  article h3 {
    color: var(--dark);
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
  }

  article p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
  }

  /* Code Blocks */
  pre {
    background: #f8f8f8;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow: auto;
    border-left: 4px solid var(--accent);
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
  }

  code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: #333;
  }

  /* Image Gallery */
  .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }

  .gallery-item {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
  }

  .gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
  }

  .gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
  }

  .gallery-item:hover img {
    transform: scale(1.05);
  }

  /* Features Section */
  .features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }

  .feature-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
  }

  .feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
  }

  .feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  }

  .feature-card h3 {
    color: var(--accent);
    margin-bottom: 1rem;
  }

  /* Footer */
  footer {
    background: linear-gradient(135deg, var(--dark), #222);
    color: white;
    padding: 3rem 0;
    text-align: center;
  }

  .footer-content {
    max-width: 800px;
    margin: 0 auto;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    list-style: none;
    margin: 2rem 0;
  }

  .footer-links li {
    margin: 0 1rem;
  }

  .footer-links a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
  }

  .footer-links a:hover {
    color: var(--highlight);
  }

  /* Animations */
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .fade-in {
    animation: fadeIn 0.8s ease-out forwards;
  }

  .delay-1 { animation-delay: 0.2s; }
  .delay-2 { animation-delay: 0.4s; }
  .delay-3 { animation-delay: 0.6s; }

  /* Responsive Design */
  @media (max-width: 768px) {
    .navbar {
      flex-direction: column;
    }

    .nav-links {
      margin-top: 1rem;
    }

    .nav-links li {
      margin-left: 1rem;
      margin-right: 1rem;
    }

    article {
      padding: 2rem;
    }

    .header-content h1 {
      font-size: 2rem;
    }
  }

  @media (max-width: 480px) {
    .header-content h1 {
      font-size: 1.8rem;
    }

    article {
      padding: 1.5rem;
    }

    .feature-card {
      padding: 1.5rem;
    }
  }