:root {
    --primary-color: #1e3c72;
    --secondary-color: #2a5298;
    --accent-color: #ff7e5f;
    --highlight-color: #feb47b;
    --text-color: #333;
    --light-bg: rgba(255,255,255,0.85);
    --dark-bg: rgba(30,60,114,0.9);
    --card-shadow: 0 10px 30px rgba(0,0,0,0.1);
    --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  }

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

  body {
    font-family: 'Open Sans', system-ui, -apple-system, sans-serif;
    line-height: 1.8;
    color: var(--text-color);
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    overflow-x: hidden;
  }

  .hero {
    min-height: 600px;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    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 center right;
    background-size: contain;
    opacity: 0.2;
  }

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

  .hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    background: linear-gradient(90deg, white, #feb47b);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

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

  .tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 5%;
  }

  .tech-card {
    background: var(--light-bg);
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
  }

  .tech-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
  }

  .tech-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
    position: relative;
    padding-bottom: 10px;
  }

  .tech-card h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--highlight-color));
    border-radius: 3px;
  }

  .tech-card img {
    width: 100%;
    border-radius: 8px;
    margin: 20px 0;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: var(--transition);
  }

  .tech-card:hover img {
    transform: scale(1.03);
  }

  .content-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 5%;
  }

  article {
    background: white;
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--card-shadow);
    margin-bottom: 50px;
  }

  article h2 {
    color: var(--primary-color);
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 15px;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), var(--highlight-color));
    border-radius: 4px;
  }

  article h3 {
    color: var(--secondary-color);
    font-size: 1.6rem;
    margin: 2rem 0 1rem;
  }

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

  pre {
    background: #1e1e1e;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow: auto;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.5);
  }

  code {
    font-family: 'Fira Code', monospace;
    color: #d4d4d4;
    font-size: 0.9rem;
  }

  .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .gallery img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: var(--transition);
  }

  .gallery img:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
  }

  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--dark-bg);
    padding: 15px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
  }

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

  .nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
  }

  .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--highlight-color);
    transition: width 0.3s ease;
  }

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

  .reference-banner {
    background: linear-gradient(90deg, var(--accent-color), var(--highlight-color));
    color: white;
    text-align: center;
    padding: 15px;
    font-weight: bold;
    position: fixed;
    bottom: 0;
    width: 100%;
    z-index: 999;
  }

  @media (max-width: 768px) {
    .hero h1 {
      font-size: 2.5rem;
    }
    
    .tech-grid {
      grid-template-columns: 1fr;
    }
    
    .nav-links {
      display: none;
    }
    
    article {
      padding: 30px 20px;
    }
  }