:root {
    --primary: #2D9CDB;
    --secondary: #F2994A;
    --light: #FFFFFF;
    --dark: #333333;
    --gray: #F5F5F5;
    --transition: all 0.3s ease;
  }

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

  body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    color: var(--dark);
    line-height: 1.6;
    background-color: var(--light);
    overflow-x: hidden;
  }

  .header-notice {
    background: linear-gradient(135deg, var(--primary), var(--light));
    color: var(--light);
    text-align: center;
    padding: 10px;
    font-size: 14px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  }

  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(45, 156, 219, 0.95);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    z-index: 1000;
    backdrop-filter: blur(5px);
    transition: var(--transition);
  }

  .navbar:hover {
    background-color: var(--primary);
  }

  .logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--light);
    text-decoration: none;
  }

  .nav-links {
    display: flex;
    gap: 30px;
  }

  .nav-links a {
    color: var(--light);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
  }

  .nav-links a:after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--light);
    transition: var(--transition);
  }

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

  .hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
  }

  .hamburger div {
    width: 25px;
    height: 3px;
    background-color: var(--light);
    margin: 4px 0;
    transition: var(--transition);
  }

  .hero {
    height: 600px;
    background: linear-gradient(135deg, rgba(45, 156, 219, 0.8), rgba(255, 255, 255, 0.9)), 
                url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
    margin-top: 60px;
    position: relative;
    overflow: hidden;
  }

  .hero:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, transparent 10%, rgba(255,255,255,0.3) 20%, transparent 30%);
    animation: shine 8s infinite linear;
  }

  @keyframes shine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
  }

  .hero h1 {
    font-size: 3.5rem;
    color: var(--dark);
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
    position: relative;
    z-index: 1;
  }

  .hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin-bottom: 30px;
    color: var(--dark);
    position: relative;
    z-index: 1;
  }

  .cta-button {
    padding: 15px 30px;
    background: linear-gradient(45deg, var(--secondary), #fbc531);
    color: var(--light);
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(242, 153, 74, 0.3);
    position: relative;
    overflow: hidden;
    z-index: 1;
  }

  .cta-button:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #fbc531, var(--secondary));
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
  }

  .cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(242, 153, 74, 0.4);
  }

  .cta-button:hover:before {
    opacity: 1;
  }

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

  article {
    padding: 80px 0;
  }

  article h2 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 30px;
    text-align: center;
    position: relative;
  }

  article h2:after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    margin: 15px auto;
    border-radius: 2px;
  }

  article h3 {
    font-size: 1.8rem;
    color: var(--primary);
    margin: 40px 0 20px;
    position: relative;
    padding-left: 20px;
  }

  article h3:before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background-color: var(--secondary);
    border-radius: 50%;
  }

  article p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 20px;
    color: #555;
  }

  pre {
    background-color: #f8f8f8;
    border-radius: 8px;
    padding: 20px;
    margin: 30px 0;
    overflow: auto;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    border-left: 4px solid var(--primary);
  }

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

  .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin: 50px 0;
  }

  .gallery-item {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    transition: var(--transition);
  }

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

  .gallery-item img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: var(--transition);
  }

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

  .gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
    color: var(--light);
    padding: 20px;
    transform: translateY(100%);
    transition: var(--transition);
  }

  .gallery-item:hover .gallery-caption {
    transform: translateY(0);
  }

  .abstract-shape {
    width: 150px;
    height: 150px;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    animation: rotateShape 15s linear infinite;
    margin: 40px auto;
    opacity: 0.8;
  }

  @keyframes rotateShape {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
  }

  .features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 50px 0;
  }

  .feature-card {
    background-color: var(--light);
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.05);
    position: relative;
    overflow: hidden;
  }

  .feature-card:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
  }

  .feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
  }

  .feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--light);
    font-size: 24px;
  }

  .feature-card h4 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--primary);
  }

  .feature-card p {
    color: #666;
  }

  .footer {
    background: linear-gradient(135deg, var(--primary), #1a7fb4);
    color: var(--light);
    padding: 50px 0;
    text-align: center;
  }

  .footer p {
    margin-bottom: 20px;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
  }

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

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

  .social-icons {
    display: flex;
    justify-content: center;
    gap: 20px;
  }

  .social-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
  }

  .social-icon:hover {
    background-color: var(--secondary);
    transform: translateY(-5px);
  }

  @media (max-width: 768px) {
    .nav-links {
      display: none;
    }

    .hamburger {
      display: flex;
    }

    .hero h1 {
      font-size: 2.5rem;
    }

    article h2 {
      font-size: 2rem;
    }

    article h3 {
      font-size: 1.5rem;
    }
  }

  @media (max-width: 480px) {
    .hero {
      height: 500px;
    }

    .hero h1 {
      font-size: 2rem;
    }

    .footer-links {
      flex-direction: column;
      gap: 15px;
    }
  }