:root {
    --primary: #87CEEB;
    --secondary: #FFA500;
    --white: #FFFFFF;
    --dark: #333333;
    --light: #F5F5F5;
    --shadow: 0 4px 20px rgba(0,0,0,0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

  body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, var(--primary), var(--light));
    background-attachment: fixed;
    padding: 0;
    margin: 0;
    overflow-x: hidden;
  }

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

  header {
    background: rgba(255,255,255,0.9);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 15px 0;
  }

  .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .logo img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
  }

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

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

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

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

  .hero {
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .hero:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center right;
    background-size: contain;
    opacity: 0.1;
    z-index: -1;
  }

  .hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--dark);
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
  }

  .hero p {
    font-size: 20px;
    max-width: 800px;
    margin: 0 auto 30px;
    color: var(--dark);
  }

  .notice {
    background: rgba(255,255,255,0.9);
    padding: 15px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    max-width: 600px;
    margin: 0 auto;
    font-size: 14px;
    color: var(--dark);
  }

  .content-section {
    padding: 60px 0;
    background: rgba(255,255,255,0.9);
    margin: 40px 0;
    border-radius: 15px;
    box-shadow: var(--shadow);
  }

  .section-title {
    text-align: center;
    margin-bottom: 50px;
    position: relative;
  }

  .section-title h2 {
    font-size: 36px;
    color: var(--dark);
    display: inline-block;
    padding-bottom: 15px;
  }

  .section-title h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: var(--secondary);
  }

  article {
    padding: 0 40px;
  }

  article h2 {
    font-size: 32px;
    margin: 40px 0 20px;
    color: var(--dark);
    position: relative;
    padding-left: 20px;
  }

  article h2:before {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    height: 80%;
    width: 5px;
    background: var(--secondary);
  }

  article h3 {
    font-size: 26px;
    margin: 30px 0 15px;
    color: var(--dark);
  }

  article h4 {
    font-size: 22px;
    margin: 25px 0 10px;
    color: var(--dark);
  }

  article p {
    font-size: 18px;
    margin-bottom: 20px;
    line-height: 1.8;
  }

  article color {
    color: var(--secondary);
    font-weight: bold;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .image-card {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 320px;
  }

  .image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
  }

  .image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
  }

  .image-card:hover img {
    transform: scale(1.05);
  }

  pre {
    background: #2d2d2d;
    border-radius: 10px;
    padding: 20px;
    margin: 30px 0;
    overflow: auto;
    box-shadow: var(--shadow);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #f8f8f2;
    font-size: 16px;
    line-height: 1.5;
  }

  .code-title {
    background: #3d3d3d;
    color: white;
    padding: 10px 20px;
    border-radius: 10px 10px 0 0;
    margin-bottom: -20px;
    font-family: 'Courier New', monospace;
    font-size: 16px;
    display: inline-block;
  }

  .card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .feature-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }

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

  .feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
  }

  .feature-card h3 {
    margin-bottom: 15px;
    color: var(--dark);
  }

  .feature-card p {
    margin-bottom: 0;
  }

  footer {
    background: var(--dark);
    color: white;
    padding: 40px 0;
    text-align: center;
    margin-top: 80px;
  }

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

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin: 20px 0;
  }

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

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

  @media (max-width: 768px) {
    .nav-links {
      gap: 15px;
    }
    
    .hero h1 {
      font-size: 36px;
    }
    
    .hero p {
      font-size: 18px;
    }
    
    article {
      padding: 0 20px;
    }
    
    .card-container {
      grid-template-columns: 1fr;
    }
  }