:root {
    --primary: #1e3c72;
    --secondary: #2a5298;
    --accent: #ff7e5f;
    --light: #ffffff;
    --dark: #0a192f;
    --text: #333333;
    --text-light: #dddddd;
  }

  @import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');

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

  body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8eb 100%);
    min-height: 100%;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
  }

  .header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
  }

  .header::after {
    content: "";
    display: block;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), #feb47b);
    margin: 1.5rem auto;
    border-radius: 2px;
  }

  .header h1 {
    font-size: 2.5rem;
    color: var(--dark);
    margin-bottom: 1rem;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
  }

  .header p {
    color: var(--text);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
  }

  .notice {
    background: rgba(255,255,255,0.9);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
    text-align: center;
    border-left: 4px solid var(--accent);
  }

  .notice p {
    color: var(--text);
    font-weight: 500;
  }

  .article-container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    padding: 2.5rem;
    margin-bottom: 3rem;
  }

  article h2 {
    font-size: 1.8rem;
    color: var(--primary);
    margin: 2rem 0 1rem;
    position: relative;
    padding-bottom: 0.5rem;
  }

  article h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #feb47b);
    border-radius: 3px;
  }

  article h3 {
    font-size: 1.4rem;
    color: var(--secondary);
    margin: 1.5rem 0 1rem;
  }

  article p {
    font-size: 1.1rem;
    color: var(--text);
    margin-bottom: 1.5rem;
    line-height: 1.7;
  }

  pre {
    background: var(--dark);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow-x: auto;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.3);
  }

  code {
    font-family: 'Roboto Mono', monospace;
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .image-card {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
  }

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

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

  .nav-link {
    padding: 0.8rem 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  }

  .nav-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
    background: linear-gradient(135deg, var(--secondary), var(--primary));
  }

  @media (max-width: 768px) {
    .container {
      padding: 1.5rem;
    }
    
    .header h1 {
      font-size: 2rem;
    }
    
    article h2 {
      font-size: 1.5rem;
    }
    
    article h3 {
      font-size: 1.2rem;
    }
    
    .article-container {
      padding: 1.5rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  /* Animation */
  @keyframes float {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-10px);
    }
  }

  .floating {
    animation: float 3s ease-in-out infinite;
  }