:root {
    --primary: #2E8B57;
    --secondary: #87CEFA;
    --accent: #FFA500;
    --text: #333;
    --light: #f5f5f5;
    --dark: #1a1a1a;
    --radius: 12px;
    --shadow: 0 8px 24px rgba(0,0,0,0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

  @font-face {
    font-family: 'Montserrat';
    src: local('Montserrat'), url(https://fonts.gstatic.com/s/montserrat/v25/JTUSjIg1_i6t8kCHKm459Wlhyw.woff2) format('woff2');
  }

  @font-face {
    font-family: 'Open Sans';
    src: local('Open Sans'), url(https://fonts.gstatic.com/s/opensans/v34/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVc.woff2) format('woff2');
  }

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

  body {
    font-family: 'Open Sans', sans-serif;
    color: var(--text);
    background: linear-gradient(135deg, #f9f9f9 0%, #e8f5e9 100%);
    line-height: 1.6;
    overflow-x: hidden;
  }

  .notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(255,255,255,0.95);
    padding: 15px 25px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    z-index: 9999;
    transform: translateX(120%);
    transition: var(--transition);
    border-left: 4px solid var(--primary);
  }

  .notification.show {
    transform: translateX(0);
  }

  .hero {
    height: 80vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    position: relative;
    overflow: hidden;
    padding: 0 5%;
  }

  .hero::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: 40%;
    background-position: right center;
    opacity: 0.1;
  }

  .hero-content {
    max-width: 600px;
    z-index: 2;
  }

  .hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
  }

  .hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
  }

  .scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
  }

  @keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
      transform: translateY(0) translateX(-50%);
    }
    40% {
      transform: translateY(-20px) translateX(-50%);
    }
    60% {
      transform: translateY(-10px) translateX(-50%);
    }
  }

  .nav-container {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
  }

  nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
  }

  .logo img {
    height: 40px;
    margin-right: 10px;
  }

  .nav-links {
    display: flex;
    gap: 2rem;
  }

  .nav-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 600;
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition);
  }

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

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

  .main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
  }

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

  article h2 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 2rem;
    position: relative;
    padding-bottom: 1rem;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
  }

  article h3 {
    font-size: 1.8rem;
    color: var(--primary);
    margin: 2rem 0 1rem;
  }

  article p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
  }

  pre {
    background: #f8f8f8;
    border-radius: var(--radius);
    padding: 1.5rem;
    margin: 2rem 0;
    overflow-x: auto;
    border-left: 4px solid var(--primary);
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(46, 139, 87, 0.1);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    color: var(--primary);
    font-size: 0.9rem;
  }

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

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

  .gallery-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.15);
  }

  .gallery-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
  }

  .gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    color: white;
    padding: 1.5rem;
  }

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

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

  .feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.1);
  }

  .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;
  }

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

  footer {
    background: var(--dark);
    color: white;
    padding: 4rem 2rem;
    text-align: center;
  }

  .footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    text-align: left;
  }

  .footer-column h3 {
    color: var(--secondary);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
  }

  .footer-column ul {
    list-style: none;
  }

  .footer-column li {
    margin-bottom: 0.8rem;
  }

  .footer-column a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
  }

  .footer-column a:hover {
    color: white;
    padding-left: 5px;
  }

  .copyright {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #aaa;
    font-size: 0.9rem;
  }

  @media (max-width: 768px) {
    .hero h1 {
      font-size: 2.5rem;
    }
    
    .nav-links {
      display: none;
    }
    
    article {
      padding: 2rem;
    }
    
    .gallery {
      grid-template-columns: 1fr;
    }
  }