:root {
    --bg: #0f0f0f;
    --fg: #f5f5f5;
    --muted: #b5b5b5;
    --accent: #ffffff;
  }
  
  * {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: system-ui, -apple-system, BlinkMacSystemFont,
                 "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
  }
  
  .container {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
  }
  
  .hero {
    text-align: center;
    margin-bottom: 3rem;
  }
  
  .hero h1 {
    font-size: 2.8rem;
    margin-bottom: 0.5rem;
  }
  
  .subtitle {
    font-size: 1.2rem;
    color: var(--muted);
  }
  
  .author {
    margin-top: 0.5rem;
    font-size: 0.95rem;
    color: var(--muted);
  }
  
  .intro {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 1.05rem;
  }
  
  .reader h2 {
    text-align: center;
    margin-bottom: 1rem;
  }
  
  .pdf-container {
    width: 100%;
    height: 80vh;
    border: 1px solid #2a2a2a;
    margin-bottom: 1rem;
  }
  
  .pdf-container iframe {
    width: 100%;
    height: 100%;
    border: none;
    background: #fff;
  }
  
  .download {
    text-align: center;
    margin-top: 1rem;
  }
  
  .download a {
    color: var(--accent);
    text-decoration: underline;
  }
  
  footer {
    margin-top: 4rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--muted);
  }
  
  footer a {
    color: var(--muted);
    text-decoration: none;
  }