body {
      margin: 0;
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
      background: #0d1117;
      color: #c9d1d9;
      display: flex;
      justify-content: center;
      align-items: flex-start;
      min-height: 100vh;
      padding: 40px 20px;
    }

    .container {
      background-color: #161b22;
      max-width: 800px;
      width: 100%;
      border-radius: 12px;
      box-shadow: 0 0 12px rgba(0, 0, 0, 0.4);
      padding: 30px;
    }

    h1 {
      color: #58a6ff;
      margin-top: 0;
      font-size: 2.5rem;
    }

    .rule-section {
      margin-top: 20px;
    }

    .rule {
      background: #21262d;
      border-left: 4px solid #58a6ff;
      padding: 15px;
      margin-bottom: 15px;
      border-radius: 6px;
    }

    .rule.placeholder {
      opacity: 0.5;
      font-style: italic;
      color: #8b949e;
    }

    footer {
      margin-top: 40px;
      text-align: center;
      font-size: 0.9em;
      color: #666;
    }

    a {
      color: #58a6ff;
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }