/* Body layout */
  body {
    max-width: 800px;       /* ✅ PC width */
    margin: 0 auto;         /* ✅ Centered */
    padding: 1rem;
    font-family: "georgia", Arial, sans-serif;
    background: linear-gradient(135deg, #134e5e, #71b280, #134e5e);
    color: #333;
  }

  /* Headings */
  h2 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #0d6efd;         /* Bootstrap blue */
    text-align: center;
    margin-bottom: 1.5rem;
  }

  h4 {
    font-size: 1.2rem;
    font-weight: 500;
    color: #212529;
  }

  /* Cards */
  .card {
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: transform 0.2s ease;
  }
  .card:hover {
    transform: translateY(-3px);
  }

  /* Buttons */
  .btn {
    font-size: 0.95rem;
    font-weight: 500;
  }

  /* Scoreboard */
  #progress {
    font-size: 1.2rem;
    font-weight: bold;
    text-align: center;
    margin-top: 1rem;
    padding: 0.5rem;
    border-radius: 8px;
    background: linear-gradient(90deg, #f8f9fa, #e9ecef);
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  }
  #progress.good {
    color: #198754;
    background: linear-gradient(90deg, #d1e7dd, #badbcc);
  }
  #progress.average {
    color: #0d6efd;
    background: linear-gradient(90deg, #cfe2ff, #9ec5fe);
  }
  #progress.bad {
    color: #dc3545;
    background: linear-gradient(90deg, #f8d7da, #f5c2c7);
  }

  /* Mistakes list */
  #mistakeList li {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    color: #444;
  }

  /* Responsive tweaks */
  @media (max-width: 768px) {
    body {
      max-width: 100%;   /* ✅ Full width on mobile */
      padding: 0.75rem;
    }
    h2 {
      font-size: 1.5rem;
    }
    .card {
      margin-bottom: 1rem;
    }