body {
      margin: 0;
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
      background: linear-gradient(to bottom, #d0e8ff, #f0f8ff);
      color: #333;
    }

    .quiz-container {
      max-width: 800px;
      margin: 2rem auto;
      padding: 2rem;
      background: #e0f0ff;
      border-radius: 20px;
      box-shadow: 0 5px 15px rgba(0, 119, 204, 0.2);
    }

    h2 {
      font-size: 1.8rem;
      color: #005fa3;
    }

    .progress-info {
      display: flex;
      justify-content: space-between;
      margin-bottom: 1rem;
      font-weight: bold;
      font-size: 1.1rem;
    }

    .progress-bar {
      height: 15px;
      width: 100%;
      background: #cce6ff;
      border-radius: 10px;
      overflow: hidden;
      margin-bottom: 1.5rem;
    }

    .progress-fill {
      height: 100%;
      background: linear-gradient(90deg, #00c6ff, #0072ff);
      width: 0%;
      transition: width 0.4s ease;
    }

    .options {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      margin-top: 1.5rem;
      justify-content: center;
    }

    .option-btn {
      background: linear-gradient(135deg, #00c6ff, #0072ff);
      color: white;
      border: none;
      border-radius: 20px;
      padding: 2rem 1.5rem;
      font-size: 1.2rem;
      font-weight: bold;
      cursor: pointer;
      transition: transform 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
      flex: 1 1 40%;
      max-width: 250px;
      box-shadow: 0 6px 12px rgba(0, 114, 255, 0.3);
    }

    .option-btn:hover {
      transform: scale(1.07);
      background: linear-gradient(135deg, #1de9b6, #1dc4e9);
      box-shadow: 0 8px 16px rgba(0, 200, 255, 0.4);
    }

    .score {
      margin-top: 1rem;
      font-size: 1.2rem;
      font-weight: bold;
      color: #0077cc;
      text-align: center;
    }

    .feedback {
      text-align: center;
      font-weight: bold;
      margin-top: 1rem;
      font-size: 1.2rem;
    }

    .correct {
      color: #00c853;
    }

    .incorrect {
      color: #d50000;
    }

    .confetti {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 9999;
    }

    .result {
      text-align: center;
      margin-top: 2rem;
      font-size: 1.4rem;
    }

    .retry-btn {
      margin-top: 2rem;
      padding: 1rem 2rem;
      background: #ff4081;
      color: white;
      border: none;
      border-radius: 15px;
      font-size: 1rem;
      cursor: pointer;
    }

    .retry-btn:hover {
      background: #e91e63;
    }

    .responsive {
      max-width: 100%;
      max-width: 400px;
      height: auto;
    }