body {
      font-family: 'Montserrat', 'Segoe UI', sans-serif;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      min-height: 100vh;
      margin: 0;
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 0;
    }
    .quiz-container {
      background: rgba(255,255,255,0.95);
      padding: 40px 30px 30px 30px;
      border-radius: 18px;
      width: 100%;
      max-width: 480px;
      box-shadow: 0 8px 32px rgba(44,62,80,0.18);
      position: relative;
      animation: fadeIn 1s;
    }
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(40px);}
      to { opacity: 1; transform: translateY(0);}
    }
    h1 {
      text-align: center;
      margin-bottom: 18px;
      font-size: 2.2rem;
      color: #5f2c82;
      letter-spacing: 1px;
    }
    #progress-bar {
      width: 100%;
      background: #e0e0e0;
      border-radius: 8px;
      height: 10px;
      margin-bottom: 18px;
      overflow: hidden;
    }
    #progress {
      height: 100%;
      background: linear-gradient(90deg, #43cea2 0%, #185a9d 100%);
      width: 0%;
      transition: width 0.4s;
    }
    #timer {
      text-align: right;
      margin-bottom: 10px;
      color: #ff4e50;
      font-weight: bold;
      font-size: 1.1rem;
    }
    #question {
      font-weight: 700;
      margin-bottom: 18px;
      font-size: 1.15rem;
      color: #333;
      min-height: 48px;
    }
    ul {
      list-style: none;
      padding: 0;
      margin: 0 0 10px 0;
    }
    ul li {
      margin: 10px 0;
      padding: 13px 18px;
      background: #f7f7fa;
      border-radius: 7px;
      cursor: pointer;
      transition: 0.25s;
      font-size: 1rem;
      border: 2px solid transparent;
      position: relative;
      user-select: none;
    }
    ul li.selected {
      border-color: #43cea2;
      background: #e0f7fa;
    }
    ul li.correct {
      background: #43cea2;
      color: #fff;
      border-color: #43cea2;
    }
    ul li.incorrect {
      background: #ff4e50;
      color: #fff;
      border-color: #ff4e50;
    }
    ul li:hover:not(.selected):not(.correct):not(.incorrect) {
      background: #e3e3ff;
      color: #5f2c82;
    }
    button {
      margin-top: 18px;
      padding: 12px 0;
      width: 100%;
      background: linear-gradient(90deg, #43cea2 0%, #185a9d 100%);
      border: none;
      color: white;
      border-radius: 6px;
      cursor: pointer;
      font-size: 1.1rem;
      font-weight: 600;
      letter-spacing: 1px;
      transition: background 0.2s;
      box-shadow: 0 2px 8px rgba(44,62,80,0.08);
    }
    button:disabled {
      background: #bdbdbd;
      cursor: not-allowed;
    }
    .hidden {
      display: none;
    }
    #result-box h2 {
      color: #43cea2;
      text-align: center;
      margin-bottom: 10px;
    }
    #score {
      font-size: 1.3rem;
      color: #5f2c82;
      font-weight: bold;
    }
    .category {
      display: inline-block;
      background: #e0e7ff;
      color: #5f2c82;
      font-size: 0.9rem;
      padding: 2px 10px;
      border-radius: 12px;
      margin-bottom: 8px;
      font-weight: 600;
      letter-spacing: 0.5px;
    }
    @media (max-width: 600px) {
      .quiz-container { padding: 18px 5px 18px 5px; }
      h1 { font-size: 1.3rem; }
    }