:root {
    --bg: #181818;
    --fg: #f0f0f0;
    --accent: #4a90e2;
    --nav-bg: #1a1a1a;
    --border: #333;
  }
  
  * { box-sizing: border-box; margin: 0; padding: 0; }
  
  body {
    font-family: sans-serif;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
  }
  
  header {
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
  }
  
  nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 1.5rem;
    padding: 1rem;
  }
  
  nav a {
    color: var(--fg);
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.2s;
  }
  
  nav a:hover {
    color: var(--accent);
  }
  
  main.container {
    max-width: 800px;
    margin: 3rem auto;
    padding: 0 1rem;
    text-align: center;
  }
  
  main.container h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
  }