:root {
            --primary: #667eea;
            --secondary: #764ba2;
            --success: #51cf66;
            --error: #ff6b6b;
        }

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

        body {
            font-family: 'Segoe UI', 'Cairo', sans-serif;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
            background: white;
            border-radius: 20px;
            padding: 40px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        }

        h1 {
            color: var(--primary);
            text-align: center;
            margin-bottom: 10px;
        }

        .subtitle {
            color: #666;
            text-align: center;
            margin-bottom: 30px;
        }

        .reasoning {
            background: #f8f9fa;
            padding: 25px;
            border-radius: 12px;
            border-right: 5px solid var(--error);
            margin-bottom: 25px;
        }

        .reasoning h2 {
            color: var(--error);
            margin-bottom: 15px;
        }

        .reasoning p {
            font-size: 1.1rem;
            line-height: 1.8;
            margin-bottom: 12px;
        }

        .question {
            background: #e7f3ff;
            padding: 20px;
            border-radius: 12px;
            border-right: 5px solid #4ecdc4;
            margin-bottom: 25px;
        }

        .question h2 {
            color: #0056b3;
            font-size: 1.3rem;
        }

        .options {
            margin: 25px 0;
        }

        .option {
            background: white;
            border: 3px solid #dee2e6;
            padding: 20px;
            margin: 15px 0;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .option:hover {
            border-color: var(--primary);
            transform: translateX(-5px);
        }

        .option.selected {
            background: #f0f4ff;
            border-color: var(--primary);
            border-width: 4px;
        }

        .option input { width: 24px; height: 24px; }
        .option label { flex: 1; font-size: 1.1rem; cursor: pointer; }
        .option-icon { font-size: 1.5rem; }

        .option.correct { background: #d4edda; border-color: var(--success); }
        .option.wrong { background: #f8d7da; border-color: var(--error); }

        .actions {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin: 30px 0;
        }

        button {
            padding: 15px 40px;
            font-size: 1.1rem;
            font-weight: bold;
            border: none;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .verify-btn {
            background: linear-gradient(135deg, var(--success), #37b24d);
            color: white;
        }

        .verify-btn:disabled {
            background: #adb5bd;
            cursor: not-allowed;
        }

        .reset-btn {
            background: linear-gradient(135deg, var(--error), #ee5a6f);
            color: white;
        }

        button:hover:not(:disabled) {
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }

        .feedback {
            padding: 30px;
            border-radius: 15px;
            margin-top: 25px;
            text-align: center;
            display: none;
        }

        .feedback.show { display: block; animation: slideUp 0.5s; }
        .feedback.correct { background: linear-gradient(135deg, var(--success), #37b24d); color: white; }
        .feedback.wrong { background: linear-gradient(135deg, var(--error), #ee5a6f); color: white; }
        .feedback-icon { font-size: 4rem; margin-bottom: 15px; }
        .feedback-title { font-size: 1.8rem; margin-bottom: 15px; }
        .feedback-text { font-size: 1.15rem; line-height: 1.8; }

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