:root {
    --bg: #ffffff;
    --fg: #1a1a1a;
    --accent: #007aff;
    --link: #0060df;
    --heading: #111111;
    --transition-speed: 0.3s;
  }
  html.dark {
    --bg: #121212;
    --fg: #e0e0e0;
    --accent: #0a84ff;
    --link: #0a72ff;
    --heading: #ffffff;
  }
  
  * { margin:0; padding:0; box-sizing: border-box; }
  body {
    background: var(--bg);
    color: var(--fg);
    font-family: 'Segoe UI', Roboto, sans-serif;
    transition: background var(--transition-speed), color var(--transition-speed);
  }
  a { color: var(--link); text-decoration: none; }
  a:hover { text-decoration: underline; }
  
  .container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
  }
  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
  }
  header h1 {
    font-size: 1.8rem;
    color: var(--heading);
  }
  
  .buttons button {
    background: none;
    border: 2px solid var(--accent);
    border-radius: 4px;
    padding: 0.4rem 0.8rem;
    color: var(--accent);
    cursor: pointer;
    font-size: 0.9rem;
    margin-left: 0.5rem;
    transition: background var(--transition-speed), color var(--transition-speed);
  }
  .buttons button:hover {
    background: var(--accent);
    color: var(--bg);
  }
  
  .content {
    transition: filter var(--transition-speed), opacity var(--transition-speed);
  }
  .content.animate-out {
    filter: blur(10px);
    opacity: 0;
  }
  .content.animate-in {
    filter: blur(10px);
    opacity: 0;
  }
  
  section + section { margin-top: 1.5rem; }
  h2 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--heading);
  }
  p { margin-bottom: 1rem; }
  
  footer {
    margin-top: 3rem;
    font-size: 0.85rem;
    text-align: center;
    opacity: 0.7;
  }