* {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 0 0 20px 0;
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            backdrop-filter: blur(10px);
            overflow: hidden;
        }

        .header {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            color: white;
            padding: 30px;
            text-align: center;
        }

        .header h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
        }

        .header p {
            font-size: 1.1em;
            opacity: 0.9;
        }

        .quiz-content {
            padding: 40px;
        }

        .user-info {
            background: #f8f9fa;
            padding: 25px;
            border-radius: 15px;
            margin-bottom: 30px;
            border-left: 5px solid #4facfe;
        }

        .user-info h3 {
            color: #333;
            margin-bottom: 15px;
            font-size: 1.3em;
        }

        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-weight: 600;
        }

        input[type="text"], input[type="email"] {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 16px;
            transition: all 0.3s ease;
        }

        input[type="text"]:focus, input[type="email"]:focus {
            outline: none;
            border-color: #4facfe;
            box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.1);
        }

        .question {
            background: white;
            border: 2px solid #f0f0f0;
            border-radius: 15px;
            padding: 25px;
            margin-bottom: 25px;
            transition: all 0.3s ease;
        }

        .question:hover {
            border-color: #4facfe;
            box-shadow: 0 5px 15px rgba(79, 172, 254, 0.1);
        }

        .question h3 {
            color: #333;
            margin-bottom: 20px;
            font-size: 1.2em;
            line-height: 1.5;
        }

        .option {
            margin: 12px 0;
            position: relative;
        }

        .option label {
            display: flex;
            align-items: center;
            cursor: pointer;
            padding: 12px 15px;
            border-radius: 10px;
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }

        .option label:hover {
            background: #f8f9ff;
            border-color: #e0e8ff;
        }

        .option input[type="radio"] {
            margin-right: 12px;
            transform: scale(1.2);
        }

        .option input[type="radio"]:checked + span {
            color: #4facfe;
            font-weight: 600;
        }

        .submit-btn {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            color: white;
            border: none;
            padding: 15px 40px;
            font-size: 18px;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: block;
            margin: 30px auto 0;
            box-shadow: 0 4px 15px rgba(79, 172, 254, 0.3);
        }

        .submit-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(79, 172, 254, 0.4);
        }

        .submit-btn:disabled {
            background: #ccc;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .loading {
            display: none;
            text-align: center;
            padding: 20px;
        }

        .spinner {
            border: 4px solid #f3f3f3;
            border-top: 4px solid #4facfe;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin: 0 auto 15px;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .result {
            display: none;
            background: linear-gradient(135deg, #56ab2f 0%, #a8e6cf 100%);
            color: white;
            padding: 30px;
            border-radius: 15px;
            text-align: center;
            margin-top: 30px;
        }

        .result.show {
            display: block;
            animation: slideIn 0.5s ease-out;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .score {
            font-size: 2.5em;
            font-weight: bold;
            margin-bottom: 10px;
        }

        .error {
            background: #ff6b6b;
            color: white;
            padding: 15px;
            border-radius: 10px;
            margin: 20px 0;
            display: none;
        }

        .progress-bar {
            position: sticky;
            top: 40px;
            padding: 0;
            background: #e0e0e0;
            height: 6px;
            border-radius: 3px;
            margin: 0 0 20px 0;
            overflow: hidden;
            z-index: 9999;
        }

        .progress-fill {
            background: linear-gradient(90deg, #4facfe, #71f50a);
            height: 100%;
            width: 0%;
            transition: width 0.3s ease;
        }
        
        #timerBar {
           position: sticky;
           top: 0;
           background-color: #333;
           color: white;
           padding: 10px;
           font-size: 1.1em;
           font-weight: bold;
           z-index: 999;
           text-align: center;
           border-bottom: 2px solid #666;
        }
        
        #timerBar.warning {
           background-color: #a94442; /* Bootstrap danger red */
           color: white;
           animation: blink 1s step-start 0s infinite;
        }

        @keyframes blink {
             50% {
             opacity: 0.5;
             }
        }

        
        .question img {
            max-height: 400px;
            object-fit: contain;
        }

        .option {
           margin-bottom: 10px;
        }

        .option label {
           display: block;
           cursor: pointer;
         }

         .option img {
            max-height: 200px;
            margin-left: 10px;
          }
         
         label.correct {
         background-color: #d4edda;
         border-left: 5px solid #28a745;
         padding: 4px;
         }

         label.wrong {
         background-color: #f8d7da;
         border-left: 5px solid #dc3545;
         padding: 4px;
         }

         label.missed {
         background-color: #fff3cd;
         border-left: 5px solid #ffc107;
         padding: 4px;
         }


        @media (max-width: 768px) {
            .container {
                margin: 10px;
                border-radius: 15px;
            }
            
            .quiz-content {
                padding: 20px;
            }
            
            .header {
                padding: 20px;
            }
            
            .header h1 {
                font-size: 2em;
            }
        }