/* ========================================
   LearningHub - Gamified Quiz CSS
   (Level-based quiz with XP system)
   Extracted from common inline styles
   ======================================== */

        :root {
            --bg-primary: #0f0f1a;
            --bg-secondary: #1a1a2e;
            --bg-card: #252540;
            --accent-orange: #f59e0b;
            --accent-purple: #8b5cf6;
            --accent-green: #10b981;
            --accent-cyan: #06b6d4;
            --accent-red: #ef4444;
            --accent-yellow: #fbbf24;
            --text-primary: #f1f5f9;
            --text-secondary: #94a3b8;
            --border: #3d3d5c;
        }

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

        body {
            font-family: 'Inter', sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            min-height: 100vh;
            overflow-x: hidden;
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
            padding: 1.5rem;
        }

        .quiz-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 1.5rem;
            background: var(--bg-secondary);
            border-radius: 16px;
            margin-bottom: 2rem;
            border: 1px solid var(--border);
        }

        .quiz-title {
            font-size: 1.3rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .xp-display {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-purple));
            padding: 0.5rem 1rem;
            border-radius: 20px;
            font-weight: 700;
            color: #fff;
        }

        .level-map {
            display: flex;
            justify-content: center;
            gap: 1rem;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }

        .level-node {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 800;
            cursor: pointer;
            transition: all 0.3s;
            position: relative;
            border: 3px solid var(--border);
            background: var(--bg-card);
        }

        .level-node.locked {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .level-node.locked::after {
            content: '🔒';
            position: absolute;
            font-size: 1rem;
            bottom: -5px;
            right: -5px;
        }

        .level-node.active {
            border-color: var(--accent-orange);
            box-shadow: 0 0 20px rgba(245, 158, 11, 0.5);
            animation: pulse 2s infinite;
        }

        .level-node.completed {
            background: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));
            border-color: var(--accent-green);
        }

        .level-node.completed::after {
            content: '✓';
            position: absolute;
            font-size: 0.8rem;
            bottom: -5px;
            right: -5px;
            background: var(--accent-green);
            border-radius: 50%;
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }

        .level-connector {
            width: 30px;
            height: 3px;
            background: var(--border);
            align-self: center;
        }

        .level-connector.completed {
            background: var(--accent-green);
        }

        .quiz-area {
            background: var(--bg-secondary);
            border-radius: 20px;
            padding: 2rem;
            border: 1px solid var(--border);
            min-height: 400px;
        }

        .level-intro {
            text-align: center;
            padding: 2rem;
        }

        .level-intro h2 {
            font-size: 2rem;
            margin-bottom: 1rem;
            color: var(--accent-orange);
        }

        .level-intro p {
            color: var(--text-secondary);
            margin-bottom: 2rem;
            font-size: 1.1rem;
        }

        .level-intro .xp-reward {
            display: inline-block;
            background: rgba(245, 158, 11, 0.2);
            color: var(--accent-orange);
            padding: 0.5rem 1rem;
            border-radius: 20px;
            margin-bottom: 2rem;
        }

        .question-container {
            display: none;
        }

        .question-container.active {
            display: block;
            animation: slideIn 0.5s ease;
        }

        @keyframes slideIn {
            from { opacity: 0; transform: translateX(30px); }
            to { opacity: 1; transform: translateX(0); }
        }

        .question-progress {
            display: flex;
            justify-content: center;
            gap: 0.5rem;
            margin-bottom: 1.5rem;
        }

        .progress-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--border);
        }

        .progress-dot.current {
            background: var(--accent-orange);
        }

        .progress-dot.correct {
            background: var(--accent-green);
        }

        .progress-dot.wrong {
            background: var(--accent-red);
        }

        .question-text {
            font-size: 1.3rem;
            font-weight: 600;
            margin-bottom: 1.5rem;
            text-align: center;
            line-height: 1.6;
        }

        .options-grid {
            display: grid;
            gap: 1rem;
            margin-top: 1.5rem;
        }

        .option {
            padding: 1.2rem 1.5rem;
            background: var(--bg-card);
            border: 2px solid var(--border);
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.2s;
            font-size: 1rem;
            text-align: left;
        }

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

        .option.correct {
            border-color: var(--accent-green);
            background: rgba(16, 185, 129, 0.2);
        }

        .option.wrong {
            border-color: var(--accent-red);
            background: rgba(239, 68, 68, 0.2);
        }

        .feedback-box {
            display: none;
            padding: 1.5rem;
            border-radius: 12px;
            margin-top: 1.5rem;
            text-align: center;
        }

        .feedback-box.show {
            display: block;
            animation: fadeIn 0.3s ease;
        }

        .feedback-box.correct {
            background: rgba(16, 185, 129, 0.2);
            border: 2px solid var(--accent-green);
        }

        .feedback-box.wrong {
            background: rgba(239, 68, 68, 0.2);
            border: 2px solid var(--accent-red);
        }

        .feedback-icon {
            font-size: 3rem;
            margin-bottom: 0.5rem;
        }

        .feedback-text {
            font-size: 1.1rem;
            margin-bottom: 1rem;
        }

        .explanation {
            font-size: 0.95rem;
            color: var(--text-secondary);
            background: var(--bg-card);
            padding: 1rem;
            border-radius: 8px;
            margin-top: 1rem;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 1rem 2rem;
            border-radius: 12px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            border: none;
            transition: all 0.3s;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-purple));
            color: white;
        }

        .btn-primary:hover {
            transform: scale(1.05);
            box-shadow: 0 10px 30px rgba(245, 158, 11, 0.3);
        }

        .btn-success {
            background: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));
            color: white;
        }

        .btn-outline {
            background: transparent;
            border: 2px solid var(--border);
            color: var(--text-secondary);
        }

        .btn-outline:hover {
            border-color: var(--accent-orange);
            color: var(--accent-orange);
        }

        .level-complete {
            display: none;
            text-align: center;
            padding: 3rem;
        }

        .level-complete.show {
            display: block;
            animation: celebrate 0.5s ease;
        }

        @keyframes celebrate {
            0% { transform: scale(0.8); opacity: 0; }
            50% { transform: scale(1.1); }
            100% { transform: scale(1); opacity: 1; }
        }

        .level-complete-icon {
            font-size: 5rem;
            margin-bottom: 1rem;
        }

        .level-complete h2 {
            font-size: 2rem;
            color: var(--accent-green);
            margin-bottom: 1rem;
        }

        .xp-earned {
            font-size: 2rem;
            color: var(--accent-orange);
            margin: 1.5rem 0;
        }

        .score-display {
            font-size: 1.2rem;
            color: var(--text-secondary);
            margin-bottom: 2rem;
        }

        .stars {
            font-size: 3rem;
            margin: 1rem 0;
        }

        .back-link {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--text-secondary);
            text-decoration: none;
            margin-bottom: 1rem;
            font-size: 0.9rem;
        }

        .back-link:hover {
            color: var(--accent-cyan);
        }

        @media (max-width: 600px) {
            .container { padding: 1rem; }
            .quiz-header { flex-direction: column; gap: 1rem; }
            .level-node { width: 50px; height: 50px; font-size: 1.2rem; }
            .question-text { font-size: 1.1rem; }
        }

        footer {
            margin-top: 3rem;
            padding: 1.5rem;
            text-align: center;
            color: var(--text-secondary);
            font-size: 0.85rem;
            border-top: 1px solid var(--border);
        }