:root {
    --primary-color: #4A90E2;
    --secondary-color: #7ED321;
    --accent-color: #F5A623;
    --bg-color: #F0F0F0;
    --text-color: #333333;
    --light-text: #FFFFFF;
    --card-shadow: 0 10px 30px 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;
    font-family: 'Open Sans', sans-serif;
  }

  body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding-top: 80px;
    overflow-x: hidden;
  }

  .header-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--light-text);
    padding: 15px 5%;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .header-title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  }

  .nav-links {
    display: flex;
    gap: 25px;
  }

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

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

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

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

  .hero-section {
    background: radial-gradient(circle at 70% 30%, rgba(74, 144, 226, 0.1), transparent 60%),
                linear-gradient(to bottom, var(--bg-color), var(--bg-color));
    padding: 60px 5% 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .hero-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    font-weight: 800;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    animation: fadeInUp 1s ease;
  }

  .hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-color);
    max-width: 800px;
    margin: 0 auto 40px;
    animation: fadeInUp 1s ease 0.2s forwards;
    opacity: 0;
  }

  .hero-decoration {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: -1;
  }

  .decoration-circle {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0.1;
    filter: blur(20px);
  }

  .circle-1 {
    width: 300px;
    height: 300px;
    top: -100px;
    right: -100px;
  }

  .circle-2 {
    width: 200px;
    height: 200px;
    bottom: -50px;
    left: -50px;
  }

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

  .article-card {
    background-color: white;
    border-radius: 15px;
    box-shadow: var(--card-shadow);
    padding: 40px;
    margin-bottom: 50px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }

  .article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
  }

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

  h2 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 10px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
  }

  h3 {
    color: var(--secondary-color);
    font-size: 1.4rem;
    margin: 30px 0 15px;
  }

  p {
    margin-bottom: 20px;
    font-size: 1.1rem;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }

  .image-card {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    position: relative;
  }

  .image-card:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 25px 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(1.1);
  }

  pre {
    background: #2d2d2d;
    border-radius: 8px;
    padding: 20px;
    margin: 25px 0;
    overflow-x: auto;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  }

  code {
    font-family: 'Fira Code', monospace;
    color: #f8f8f2;
    font-size: 0.9rem;
    line-height: 1.5;
  }

  .language-css {
    display: block;
    white-space: pre;
  }

  .footer-note {
    text-align: center;
    padding: 30px;
    color: var(--text-color);
    font-size: 0.9rem;
    opacity: 0.7;
  }

  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @keyframes float {
    0% {
      transform: translateY(0px);
    }
    50% {
      transform: translateY(-15px);
    }
    100% {
      transform: translateY(0px);
    }
  }

  .floating {
    animation: float 6s ease-in-out infinite;
  }

  @media (max-width: 768px) {
    .header-title {
      font-size: 1.2rem;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    .hero-title {
      font-size: 2rem;
    }
    
    .hero-subtitle {
      font-size: 1rem;
    }
    
    .article-card {
      padding: 30px 20px;
    }
    
    h2 {
      font-size: 1.5rem;
    }
    
    h3 {
      font-size: 1.2rem;
    }
  }

  @media (max-width: 480px) {
    .header-bar {
      flex-direction: column;
      gap: 15px;
      padding: 15px 5%;
    }
    
    .nav-links {
      flex-wrap: wrap;
      justify-content: center;
    }
    
    .hero-title {
      font-size: 1.8rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }