:root {
      --bg-light: #f4f4f4;
      --bg-dark: #121212;
      --text-light: #333;
      --text-dark: #eee;
      --primary-light: #007BFF;
      --primary-dark: #66B2FF;
    }

    body {
      font-family: 'Segoe UI', Arial, sans-serif;
      margin: 0;
      padding: 0;
      transition: background 0.3s, color 0.3s;
    }

    header {
      text-align: center;
      padding: 30px 20px 15px;
      font-size: 28px;
      font-weight: bold;
    }

    #toggleMode {
      display: inline-block;
      margin: 10px auto;
      background: transparent;
      border: 2px solid currentColor;
      padding: 8px 14px;
      font-size: 14px;
      border-radius: 25px;
      cursor: pointer;
      transition: background 0.3s;
    }

    .faq-container {
      max-width: 800px;
      margin: 40px auto;
      padding: 0 20px;
    }

    .faq-item {
      margin-bottom: 15px;
      border-bottom: 1px solid #ccc;
    }

    .faq-question {
      cursor: pointer;
      padding: 15px;
      font-size: 18px;
      transition: background 0.3s;
    }

    .faq-question:hover {
      background: rgba(0, 123, 255, 0.1);
    }

    .faq-answer {
      display: none;
      padding: 15px;
      font-size: 16px;
      line-height: 1.6;
    }

    footer {
      text-align: center;
      padding: 20px;
      font-size: 14px;
      margin-top: 40px;
    }

    body.light-mode {
      background: var(--bg-light);
      color: var(--text-light);
    }
    body.light-mode header {
      background: var(--primary-light);
      color: white;
    }
    body.light-mode #toggleMode {
      color: var(--primary-light);
    }
    body.light-mode .faq-question {
      color: var(--primary-light);
    }
    body.light-mode footer {
      background: #eee;
      color: #666;
    }

    body.dark-mode {
      background: var(--bg-dark);
      color: var(--text-dark);
    }
    body.dark-mode header {
      background: var(--primary-dark);
      color: white;
    }
    body.dark-mode #toggleMode {
      color: var(--primary-dark);
    }
    body.dark-mode .faq-question {
      color: var(--primary-dark);
    }
    body.dark-mode footer {
      background: #1e1e1e;
      color: #aaa;
    }