:root {
    --primary: #7b5eff;
    --primary-hover: #6247e0;
    --accent: #00b894;
    --background: #1e1e1e;
    --surface: #2a2a2a;
    --text: #ffffff;
    --transition: all 0.3s ease;
  }
  
  .light-mode {
    --background: #ffffff;
    --surface: #f5f5f5;
    --text: #121212;
  }
  
  body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background-color: var(--background);
    color: var(--text);
    margin: 0;
    padding: 2rem;
    display: flex;
    justify-content: center;
    transition: var(--transition);
  }
  
  .container {
    width: 100%;
    max-width: 800px;
    background-color: var(--surface);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.3);
    transition: var(--transition);
  }
  
  h2 {
    margin-top: 0;
    font-size: 1.8rem;
  }
  
  textarea, select, input[type="password"] {
    width: 95%;
    padding: 0.85rem 1rem;
    margin-bottom: 1rem;
    font-size: 1rem;
    border-radius: 0.75rem;
    border: 2px solid var(--primary);
    background-color: var(--background);
    color: var(--text);
    transition: var(--transition);
  }
  
  textarea:focus, select:focus, input:focus {
    outline: none;
    border-color: var(--primary-hover);
    box-shadow: 0 0 0 3px rgba(123, 94, 255, 0.2);
  }
  
  button {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    margin: 0.3rem;
    border: none;
    border-radius: 0.6rem;
    cursor: pointer;
    background-color: var(--primary);
    color: white;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  button:hover {
    background-color: var(--primary-hover);
  }
  
  button.secondary {
    background: var(--surface);
    color: var(--primary);
    border: 2px solid var(--primary);
  }
  
  button.secondary:hover {
    background: var(--primary);
    color: white;
  }
  
  .output {
    background-color: var(--background);
    color: var(--text);
    border-radius: 0.75rem;
    padding: 1rem 1.25rem;
    margin-top: 1.5rem;
    white-space: pre-wrap;
    box-shadow: 0 0.5rem 1.25rem rgba(0, 0, 0, 0.25);
    transition: var(--transition);
  }
  
  .score-display {
    font-size: 1.2rem;
    font-weight: bold;
    margin-top: 1rem;
    text-align: center;
    color: gold;
  }
  
  .question-block {
    background-color: var(--surface);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 0.25rem 1rem rgba(0, 0, 0, 0.15);
    transition: var(--transition);
  }
  
  .light-mode .question-block {
    background-color: #fdfdfd;
    border: 1px solid #ccc;
  }
  
  .question-block p {
    margin: 0.5rem 0;
    font-weight: 500;
  }
  
  .question-block label {
    display: block;
    margin: 0.5rem 0;
    padding: 0.75rem 1rem;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 0.6rem;
    cursor: pointer;
    transition: var(--transition);
  }
  
  .question-block input[type="radio"] {
    margin-right: 0.6rem;
    transform: scale(1.25);
  }
  
  .question-block label:hover {
    background-color: rgba(255, 255, 255, 0.1);
  }
  
  .light-mode .question-block label {
    background-color: #f9f9f9;
  }
  
  .light-mode .question-block label:hover {
    background-color: #e0e0e0;
  }
  
  .question-block button {
    margin-top: 1rem;
    background-color: var(--accent);
    color: white;
    font-weight: 600;
  }
  
  .question-block button:hover {
    background-color: #009b7d;
  }
  
  .feedback {
    font-weight: bold;
    margin-top: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
  }
  
  .feedback.correct {
    color: limegreen;
    background-color: rgba(0, 255, 0, 0.1);
  }
  
  .feedback.incorrect {
    color: crimson;
    background-color: rgba(255, 0, 0, 0.1);
  }
  
  .feedback.warning {
    color: orange;
    background-color: rgba(255, 165, 0, 0.1);
  }
  
  #progressBarContainer {
    width: 100%;
    background-color: #444;
    border-radius: 10px;
    overflow: hidden;
    margin: 1rem 0 1.5rem;
    display: none;
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.3);
  }
  
  #progressBar {
    height: 14px;
    width: 100%;
    background-color: limegreen;
    transition: width 1s linear;
    border-radius: 10px;
  }
  
  /* Responsive Design */
  @media (max-width: 768px) {
    body {
      padding: 1rem;
    }
  
    .container {
      padding: 1.25rem;
    }
  
    button {
      width: 100%;
    }
  }
  