:root {
    --primary-color: #0A2E5F;
    --secondary-color: #642EBF;
    --neutral-color: #F1F1F1;
    --accent-color: #FF7F00;
    --text-color: #333;
    --light-shadow: rgba(0, 0, 0, 0.1);
    --medium-shadow: rgba(0, 0, 0, 0.2);
    --dark-shadow: rgba(0, 0, 0, 0.3);
  }

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

  body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--neutral-color);
    overflow-x: hidden;
  }

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

  header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  header::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 0;
    width: 100%;
    height: 100px;
    background: var(--neutral-color);
    transform: skewY(-3deg);
    z-index: 1;
  }

  h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px var(--dark-shadow);
  }

  .subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 800px;
    margin: 0 auto;
  }

  .notice {
    background-color: var(--accent-color);
    color: white;
    padding: 10px;
    text-align: center;
    font-weight: bold;
    margin-bottom: 2rem;
  }

  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }

  article {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 5px 15px var(--light-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  article:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px var(--medium-shadow);
  }

  h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    position: relative;
    padding-bottom: 10px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--accent-color);
  }

  h3 {
    color: var(--secondary-color);
    margin: 1.5rem 0 1rem;
    font-size: 1.5rem;
  }

  p {
    margin-bottom: 1rem;
  }

  .image-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 2rem 0;
    justify-content: center;
  }

  .image-box {
    width: 320px;
    height: 320px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 8px var(--light-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .image-box:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px var(--medium-shadow);
  }

  .image-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  pre {
    background: #282c34;
    color: #abb2bf;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(0, 0, 0, 0.05);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-size: 0.9em;
  }

  .nav-links {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
    flex-wrap: wrap;
    gap: 1rem;
  }

  .nav-link {
    background: var(--primary-color);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    transition: background 0.3s ease, transform 0.3s ease;
    font-weight: 600;
  }

  .nav-link:hover {
    background: var(--secondary-color);
    transform: translateY(-3px);
  }

  footer {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
  }

  @media (max-width: 768px) {
    .grid {
      grid-template-columns: 1fr;
    }
    
    h1 {
      font-size: 2rem;
    }
    
    .subtitle {
      font-size: 1rem;
    }
  }

  /* Animations */
  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }

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

  .fade-in {
    animation: fadeIn 1s ease forwards;
  }

  .slide-up {
    animation: slideUp 1s ease forwards;
  }

  /* Interactive elements */
  .card {
    background: white;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px var(--light-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    margin-bottom: 2rem;
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px var(--medium-shadow);
  }