:root {
            --accent: #8b5cf6;
            --accent-glow: rgba(139, 92, 246, 0.3);
            --accent-grad: linear-gradient(135deg, #8b5cf6, #6366f1);
            --success: #10b981;
            --danger: #ef4444;
            --warning: #f59e0b;
        }

        /* ═══ MODE SELECT GRID ═══ */
        .exam-modes {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: var(--space-lg);
            margin-top: var(--space-xl);
        }

        .mode-card {
            background: var(--bg-glass);
            border: var(--glass-border);
            border-radius: var(--radius-xl);
            padding: var(--space-xl);
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
            text-decoration: none;
            color: inherit;
        }

        .mode-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--accent-grad);
            transform: scaleX(0);
            transition: transform 0.3s;
        }

        .mode-card:hover {
            transform: translateY(-6px);
            border-color: rgba(139, 92, 246, 0.3);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 0 30px var(--accent-glow);
        }

        .mode-card:hover::before {
            transform: scaleX(1);
        }

        .mode-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            margin-bottom: var(--space-md);
        }

        .mode-title {
            font-size: var(--font-size-lg);
            font-weight: 700;
            margin-bottom: var(--space-xs);
        }

        .mode-desc {
            font-size: var(--font-size-xs);
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: var(--space-md);
        }

        .mode-stats {
            display: flex;
            gap: var(--space-md);
            font-size: 11px;
            font-family: var(--font-mono);
        }

        .mode-stat {
            background: rgba(139, 92, 246, 0.08);
            padding: 4px 10px;
            border-radius: 999px;
            color: #a78bfa;
        }

        /* ═══ EXAM VIEW ═══ */
        .exam-container {
            display: none;
        }

        .exam-container.active {
            display: block;
            animation: fadeInUp 0.4s ease;
        }

        /* Top Bar */
        .exam-topbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--space-md) var(--space-lg);
            background: var(--bg-glass);
            border: var(--glass-border);
            border-radius: var(--radius-lg);
            margin-bottom: var(--space-lg);
            flex-wrap: wrap;
            gap: var(--space-md);
        }

        .exam-topbar-left {
            display: flex;
            align-items: center;
            gap: var(--space-md);
        }

        .exam-topbar-badge {
            font-size: var(--font-size-xs);
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 999px;
            background: var(--accent-grad);
            color: white;
        }

        .exam-topbar-title {
            font-weight: 600;
            font-size: var(--font-size-sm);
        }

        .exam-topbar-right {
            display: flex;
            align-items: center;
            gap: var(--space-lg);
            font-family: var(--font-mono);
            font-size: var(--font-size-sm);
        }

        .timer {
            display: flex;
            align-items: center;
            gap: 6px;
            font-weight: 700;
            color: var(--success);
        }

        .timer.warning {
            color: var(--warning);
        }

        .timer.critical {
            color: var(--danger);
            animation: pulse 1s infinite;
        }

        @keyframes pulse {

            0%,
            100% {
                opacity: 1;
            }

            50% {
                opacity: 0.5;
            }
        }

        .score-display {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .progress-mini {
            width: 120px;
            height: 6px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: 999px;
            overflow: hidden;
        }

        .progress-mini-fill {
            height: 100%;
            background: var(--accent-grad);
            border-radius: 999px;
            transition: width 0.5s ease;
        }

        /* Question Card */
        .question-card {
            background: var(--bg-glass);
            border: var(--glass-border);
            border-radius: var(--radius-xl);
            padding: var(--space-2xl);
            margin-bottom: var(--space-lg);
            position: relative;
        }

        .q-number {
            font-family: var(--font-mono);
            font-size: var(--font-size-xs);
            color: var(--text-muted);
            margin-bottom: var(--space-md);
        }

        .q-text {
            font-size: var(--font-size-base);
            line-height: 1.8;
            margin-bottom: var(--space-xl);
            color: var(--text-primary);
        }

        /* Options */
        .options-grid {
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }

        .option-btn {
            display: flex;
            align-items: flex-start;
            gap: var(--space-md);
            padding: var(--space-md) var(--space-lg);
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: all 0.2s;
            text-align: left;
            font-family: var(--font-family);
            font-size: var(--font-size-sm);
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .option-btn:hover:not(.locked) {
            background: rgba(139, 92, 246, 0.06);
            border-color: rgba(139, 92, 246, 0.2);
            color: var(--text-primary);
        }

        .option-btn .opt-letter {
            min-width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 12px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            flex-shrink: 0;
            margin-top: 2px;
            transition: all 0.2s;
        }

        .option-btn.selected {
            background: rgba(139, 92, 246, 0.1);
            border-color: rgba(139, 92, 246, 0.3);
        }

        .option-btn.selected .opt-letter {
            background: var(--accent-grad);
            border-color: transparent;
            color: white;
        }

        .option-btn.correct {
            background: rgba(16, 185, 129, 0.1);
            border-color: rgba(16, 185, 129, 0.3);
        }

        .option-btn.correct .opt-letter {
            background: linear-gradient(135deg, #10b981, #34d399);
            border-color: transparent;
            color: white;
        }

        .option-btn.wrong {
            background: rgba(239, 68, 68, 0.1);
            border-color: rgba(239, 68, 68, 0.3);
        }

        .option-btn.wrong .opt-letter {
            background: linear-gradient(135deg, #ef4444, #f87171);
            border-color: transparent;
            color: white;
        }

        .option-btn.locked {
            cursor: default;
            opacity: 0.7;
        }

        .option-btn.locked.correct,
        .option-btn.locked.wrong,
        .option-btn.locked.selected {
            opacity: 1;
        }

        /* Explanation */
        .explanation-box {
            margin-top: var(--space-lg);
            padding: var(--space-lg);
            border-radius: var(--radius-md);
            background: rgba(139, 92, 246, 0.06);
            border: 1px solid rgba(139, 92, 246, 0.15);
            display: none;
            animation: fadeInUp 0.3s ease;
        }

        .explanation-box.show {
            display: block;
        }

        .explanation-box h4 {
            font-size: var(--font-size-sm);
            margin-bottom: var(--space-sm);
            color: #a78bfa;
        }

        .explanation-box p {
            font-size: var(--font-size-xs);
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Navigation */
        .exam-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: var(--space-md);
        }

        .exam-btn {
            padding: var(--space-md) var(--space-xl);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.08);
            background: rgba(255, 255, 255, 0.03);
            color: var(--text-secondary);
            font-family: var(--font-family);
            font-size: var(--font-size-sm);
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
        }

        .exam-btn:hover {
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-primary);
        }

        .exam-btn.primary {
            background: var(--accent-grad);
            border-color: transparent;
            color: white;
        }

        .exam-btn.primary:hover {
            box-shadow: 0 8px 30px var(--accent-glow);
            transform: translateY(-1px);
        }

        .exam-btn.danger {
            border-color: rgba(239, 68, 68, 0.3);
            color: #f87171;
        }

        /* Question Map */
        .q-map {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-top: var(--space-md);
        }

        .q-map-dot {
            width: 32px;
            height: 32px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 10px;
            font-weight: 700;
            font-family: var(--font-mono);
            cursor: pointer;
            transition: all 0.2s;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.06);
            color: var(--text-muted);
        }

        .q-map-dot:hover {
            background: rgba(139, 92, 246, 0.1);
            border-color: rgba(139, 92, 246, 0.3);
        }

        .q-map-dot.current {
            background: var(--accent-grad);
            border-color: transparent;
            color: white;
        }

        .q-map-dot.answered {
            background: rgba(99, 102, 241, 0.15);
            border-color: rgba(99, 102, 241, 0.3);
            color: #818cf8;
        }

        .q-map-dot.correct-dot {
            background: rgba(16, 185, 129, 0.15);
            border-color: rgba(16, 185, 129, 0.3);
            color: #34d399;
        }

        .q-map-dot.wrong-dot {
            background: rgba(239, 68, 68, 0.15);
            border-color: rgba(239, 68, 68, 0.3);
            color: #f87171;
        }

        /* Results View */
        .results-container {
            display: none;
        }

        .results-container.active {
            display: block;
            animation: fadeInUp 0.5s ease;
        }

        .result-hero {
            text-align: center;
            padding: var(--space-2xl);
        }

        .result-score {
            font-size: 5rem;
            font-weight: 800;
            background: var(--accent-grad);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1;
        }

        .result-label {
            font-size: var(--font-size-lg);
            color: var(--text-secondary);
            margin-top: var(--space-sm);
        }

        .result-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: var(--space-md);
            margin-top: var(--space-xl);
        }

        .result-stat {
            background: var(--bg-glass);
            border: var(--glass-border);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            text-align: center;
        }

        .result-stat-value {
            font-size: 1.5rem;
            font-weight: 800;
            font-family: var(--font-mono);
        }

        .result-stat-label {
            font-size: var(--font-size-xs);
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* Topic Analysis */
        .topic-analysis {
            margin-top: var(--space-xl);
        }

        .topic-bar {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            padding: var(--space-sm) 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }

        .topic-bar-name {
            width: 180px;
            font-size: var(--font-size-xs);
            color: var(--text-secondary);
            flex-shrink: 0;
        }

        .topic-bar-track {
            flex: 1;
            height: 8px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: 999px;
            overflow: hidden;
        }

        .topic-bar-fill {
            height: 100%;
            border-radius: 999px;
            transition: width 1s ease;
        }

        .topic-bar-pct {
            width: 50px;
            text-align: right;
            font-family: var(--font-mono);
            font-size: var(--font-size-xs);
            font-weight: 700;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(16px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @media (max-width: 768px) {
            .exam-modes {
                grid-template-columns: 1fr;
            }

            .exam-topbar {
                flex-direction: column;
                align-items: flex-start;
            }

            .question-card {
                padding: var(--space-lg);
            }

            .q-map-dot {
                width: 28px;
                height: 28px;
                font-size: 9px;
            }
        }