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.badge{display:inline-block;padding:.25rem .75rem;border-radius:9999px;font-size:.875rem;font-weight:600;background:var(--primary);color:#fff}.essaylab-scope .code-snippet{background:var(--code-bg);color:var(--code-text);padding:1rem;border-radius:var(--radius);font-family:var(--font-mono);font-size:.9rem;overflow-x:auto;line-height:1.7}.essaylab-scope .btn{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);cursor:pointer;font-weight:600;font-size:.9rem;transition:background .2s,opacity .2s}.essaylab-scope .btn:hover{background:var(--primary-dark)}.essaylab-scope .btn:disabled{opacity:.5;cursor:not-allowed}.essaylab-scope .btn-secondary{background:var(--background);color:var(--text);border:1px solid var(--border)}.essaylab-scope .btn-secondary:hover{background:var(--border)}.essaylab-scope .btn-success{background:var(--success)}.essaylab-scope 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.ml-course-item{display:flex;align-items:center;gap:8px;padding:10px 14px;border-radius:var(--ml-radius-md);text-decoration:none;color:var(--ml-text-secondary);font-size:.9rem;font-weight:500;cursor:pointer;transition:all .15s;background:var(--ml-surface);border:1px solid var(--ml-border-light);margin-bottom:4px}.mathslab-scope .ml-course-item:hover{background:var(--ml-border-light);color:var(--ml-text);border-color:var(--ml-border)}.mathslab-scope .ml-course-item-title{flex:1}.mathslab-scope .ml-course-item-count{font-size:.75rem;font-weight:700;color:var(--ml-success);background:#dcfce7;padding:2px 8px;border-radius:12px;margin-left:auto}.mathslab-scope .ml-course-formula-sidebar{position:sticky;top:68px;background:var(--ml-surface);border-radius:var(--ml-radius-lg);box-shadow:0 1px 3px #0000001a;padding:24px;display:flex;flex-direction:column;gap:16px;min-width:420px}.mathslab-scope .ml-formula-sidebar-header h2{font-size:1.1rem;font-weight:800;color:var(--ml-text);margin:0 0 4px}.mathslab-scope .ml-formula-sidebar-header p{font-size:.8rem;color:var(--ml-text-light);margin:0}.mathslab-scope .ml-formula-group{padding-top:16px;border-top:1px solid var(--ml-border-light)}.mathslab-scope .ml-formula-group:first-of-type{border-top:none;padding-top:0}.mathslab-scope .ml-formula-group-title{font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--ml-primary);margin:0 0 12px}.mathslab-scope .ml-formula-list{display:flex;flex-direction:column;gap:10px}.mathslab-scope .ml-formula-item{display:flex;flex-direction:column;align-items:flex-start;gap:6px;padding:12px;background:var(--ml-bg);border-radius:var(--ml-radius-md);border:1px solid var(--ml-border-light);transition:all .15s}.mathslab-scope .ml-formula-item:hover{border-color:var(--ml-primary);background:#fff;box-shadow:0 2px 4px #0000000d}.mathslab-scope .ml-formula-shape{font-size:.8rem;font-weight:700;color:var(--ml-text-secondary)}.mathslab-scope .ml-formula-item .math-block{font-size:1rem;width:100%;overflow-x:auto;padding:4px 0}.mathslab-scope .ml-lesson-nav{background:var(--ml-surface);border-bottom:1px solid var(--ml-border);padding:10px 24px;margin:-2rem -2.5rem 0;margin-bottom:0}.mathslab-scope .ml-lesson-nav-inner{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--ml-text-secondary);margin-bottom:8px}.mathslab-scope .ml-lesson-back{color:var(--ml-primary);cursor:pointer;font-weight:500}.mathslab-scope .ml-lesson-back:hover{text-decoration:underline}.mathslab-scope .ml-lesson-nav-divider{color:var(--ml-text-light)}.mathslab-scope .ml-lesson-nav-current{color:var(--ml-text);font-weight:600}.mathslab-scope .ml-mode-toggle{margin-left:auto;padding:5px 14px;font-size:.78rem;font-weight:600;border:1.5px solid var(--ml-border);border-radius:20px;background:var(--ml-surface);color:var(--ml-text-secondary);cursor:pointer;transition:all .15s}.mathslab-scope .ml-mode-toggle:hover{border-color:var(--ml-primary);color:var(--ml-primary)}.mathslab-scope .ml-mode-toggle.active{background:var(--ml-primary);border-color:var(--ml-primary);color:#fff}.mathslab-scope .ml-lesson-nav-siblings{display:flex;gap:6px;flex-wrap:wrap}.mathslab-scope .ml-sibling-link{font-size:.8rem;padding:4px 12px;border-radius:20px;cursor:pointer;color:var(--ml-text-secondary);background:var(--ml-border-light);transition:all .15s}.mathslab-scope .ml-sibling-link:hover{background:#eef2ff;color:var(--ml-primary)}.mathslab-scope .ml-sibling-link.active{background:var(--ml-primary);color:#fff}.mathslab-scope .ml-lesson-header{padding:24px 0 0}.mathslab-scope .ml-lesson-title{font-size:1.7rem;font-weight:800;color:var(--ml-text);margin:0 0 8px}.mathslab-scope .ml-lesson-desc{font-size:.95rem;color:var(--ml-text-secondary);margin:0;line-height:1.6}.mathslab-scope .ml-formula-card{margin:16px 0;padding:18px 24px;background:linear-gradient(135deg,#eef2ff,#f5f3ff);border:1px solid #C7D2FE;border-radius:var(--ml-radius-lg)}.mathslab-scope .ml-formula-card-content{display:flex;align-items:center;gap:20px}.mathslab-scope .ml-formula-text-side{flex:1}.mathslab-scope .ml-formula-diagram-side{flex-shrink:0}.mathslab-scope .ml-formula-label{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--ml-primary);margin-bottom:8px}.mathslab-scope .ml-formula-math{padding:8px 0;font-size:1.3rem}.mathslab-scope .ml-formula-explanation{margin:8px 0 0;font-size:.88rem;color:var(--ml-text-secondary);line-height:1.5}.mathslab-scope .ml-tips-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:0 0 16px}.mathslab-scope .ml-tips-card{border-radius:var(--ml-radius-md);padding:14px 18px}.mathslab-scope .ml-tips-pro{background:#ecfdf5;border:1px solid #A7F3D0}.mathslab-scope .ml-tips-pitfall{background:#fef2f2;border:1px solid #FECACA}.mathslab-scope .ml-tips-header{font-size:.82rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px}.mathslab-scope .ml-tips-pro .ml-tips-header{color:#059669}.mathslab-scope .ml-tips-pitfall .ml-tips-header{color:#dc2626}.mathslab-scope .ml-tip-item{display:flex;gap:8px;margin-bottom:8px}.mathslab-scope .ml-tip-item:last-child{margin-bottom:0}.mathslab-scope .ml-tip-icon{width:20px;height:20px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:800;flex-shrink:0;margin-top:2px}.mathslab-scope .ml-tip-icon-pro{background:#059669;color:#fff}.mathslab-scope .ml-tip-icon-pitfall{background:#dc2626;color:#fff}.mathslab-scope .ml-tip-item strong{display:block;font-size:.82rem;color:var(--ml-text);margin-bottom:2px}.mathslab-scope .ml-tip-item p{margin:0;font-size:.8rem;color:var(--ml-text-secondary);line-height:1.5}.mathslab-scope .ml-split-screen{display:grid;grid-template-columns:1fr 1fr;gap:0;margin:0 -2.5rem;min-height:50vh}.mathslab-scope .ml-split-left,.mathslab-scope .ml-split-right{padding:20px 24px 40px}.mathslab-scope .ml-split-left{background:var(--ml-surface);border-right:2px solid var(--ml-border)}.mathslab-scope .ml-split-right{background:#fafbff}.mathslab-scope .ml-split-header{margin-bottom:14px}.mathslab-scope .ml-split-header h2{font-size:1.1rem;font-weight:700;color:var(--ml-text);margin:6px 0 0}.mathslab-scope .ml-split-badge{display:inline-block;font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;padding:3px 10px;border-radius:20px}.mathslab-scope .ml-split-badge-example{background:#dbeafe;color:#1d4ed8}.mathslab-scope .ml-split-badge-practice{background:#d1fae5;color:#047857}.mathslab-scope .ml-split-problem{font-size:.9rem;color:var(--ml-text-secondary);margin:0 0 16px;line-height:1.6;padding:10px 14px;background:var(--ml-border-light);border-radius:var(--ml-radius-md);border-left:3px solid var(--ml-primary)}.mathslab-scope .ml-worked-steps{display:flex;flex-direction:column;gap:10px}.mathslab-scope .ml-worked-step{display:flex;gap:12px;padding:12px;background:var(--ml-bg);border-radius:var(--ml-radius-md);border:1px solid var(--ml-border-light)}.mathslab-scope .ml-step-num-badge{width:28px;height:28px;border-radius:50%;background:var(--ml-primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.78rem;font-weight:700;flex-shrink:0}.mathslab-scope .ml-step-content{flex:1;min-width:0}.mathslab-scope .ml-step-instruction{font-size:.88rem;font-weight:600;color:var(--ml-text);margin-bottom:4px}.mathslab-scope .ml-step-math{padding:4px 0;overflow-x:auto}.mathslab-scope .ml-step-explanation{font-size:.78rem;color:var(--ml-text-light);margin-top:4px;font-style:italic}.mathslab-scope .ml-practice-steps{display:flex;flex-direction:column;gap:10px}.mathslab-scope .ml-practice-step{display:flex;gap:12px;padding:12px;background:var(--ml-surface);border-radius:var(--ml-radius-md);border:1px solid var(--ml-border);transition:border-color .2s}.mathslab-scope .ml-practice-step.step-correct{border-color:#10b981;background:#f0fdf4}.mathslab-scope .ml-practice-step.step-wrong{border-color:#ef4444;background:#fef2f2}.mathslab-scope .ml-practice-step .ml-step-num-badge{background:var(--ml-accent)}.mathslab-scope .ml-practice-step.step-correct .ml-step-num-badge{background:#10b981}.mathslab-scope .ml-hint-toggle{font-size:.78rem;color:var(--ml-primary);background:none;border:none;cursor:pointer;padding:2px 0;margin-bottom:4px;text-decoration:underline}.mathslab-scope .ml-hint-box{font-size:.8rem;color:var(--ml-text-secondary);background:#fef3c7;border:1px solid #FDE68A;border-radius:var(--ml-radius-sm);padding:6px 10px;margin-bottom:6px}.mathslab-scope .ml-step-input-row{display:flex;align-items:center;gap:6px}.mathslab-scope .ml-step-input{flex:1;padding:7px 10px;border:1.5px solid var(--ml-border);border-radius:var(--ml-radius-sm);font-size:.9rem;outline:none;transition:border-color .15s}.mathslab-scope .ml-step-input:focus{border-color:var(--ml-primary);box-shadow:0 0 0 3px #4f46e51a}.mathslab-scope .ml-step-input.input-correct{border-color:#10b981;background:#f0fdf4}.mathslab-scope .ml-step-input.input-wrong{border-color:#ef4444;background:#fef2f2}.mathslab-scope .ml-step-input:disabled{opacity:.7;cursor:not-allowed}.mathslab-scope .ml-step-unit{font-size:.82rem;color:var(--ml-text-secondary);font-weight:500;white-space:nowrap}.mathslab-scope .ml-check-btn{padding:7px 16px;background:var(--ml-primary);color:#fff;border:none;border-radius:var(--ml-radius-sm);font-size:.82rem;font-weight:600;cursor:pointer;white-space:nowrap}.mathslab-scope .ml-check-btn:hover:not(:disabled){background:var(--ml-primary-dark)}.mathslab-scope .ml-check-btn:disabled{opacity:.5;cursor:not-allowed}.mathslab-scope .ml-step-feedback{margin-top:4px;font-size:.8rem;font-weight:500;padding:4px 8px;border-radius:var(--ml-radius-sm)}.mathslab-scope .ml-step-feedback.feedback-correct{color:#047857;background:#ecfdf5}.mathslab-scope .ml-step-feedback.feedback-wrong{color:#b91c1c;background:#fef2f2}.mathslab-scope .ml-progress-bar{position:relative;height:20px;background:#e2e8f0;border-radius:10px;margin-top:8px;overflow:hidden}.mathslab-scope .ml-progress-fill{height:100%;background:linear-gradient(90deg,#10b981,#059669);border-radius:10px;transition:width .4s ease}.mathslab-scope .ml-progress-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:.7rem;font-weight:700;color:var(--ml-text)}.mathslab-scope .ml-completion-banner{margin-top:16px;padding:18px;background:linear-gradient(135deg,#d1fae5,#a7f3d0);border-radius:var(--ml-radius-md);text-align:center;font-size:.95rem;font-weight:700;color:#047857;display:flex;flex-direction:column;align-items:center;gap:10px}.mathslab-scope .ml-next-lesson-btn{display:inline-block;padding:8px 20px;background:var(--ml-primary);color:#fff;border-radius:var(--ml-radius-md);cursor:pointer;font-size:.85rem;font-weight:600}.mathslab-scope .ml-next-lesson-btn:hover{background:var(--ml-primary-dark)}.mathslab-scope .ml-paper-mode-steps{display:flex;flex-direction:column;gap:12px}.mathslab-scope .ml-paper-step{display:flex;gap:12px;padding:12px;background:var(--ml-surface);border-radius:var(--ml-radius-md);border:1px solid var(--ml-border)}.mathslab-scope .ml-paper-badge{background:#6b7280}.mathslab-scope .ml-paper-answer-line{margin-top:6px;font-size:.88rem;color:var(--ml-text-light);padding:6px 0;border-bottom:1.5px dashed var(--ml-border)}.mathslab-scope .ml-paper-revealed-answer{margin-top:4px;font-size:.8rem;color:#059669;font-weight:600;padding:4px 8px;background:#ecfdf5;border-radius:var(--ml-radius-sm)}.mathslab-scope .ml-paper-actions{display:flex;gap:10px;margin-top:8px}.mathslab-scope .ml-show-answers-btn,.mathslab-scope .ml-print-btn{padding:8px 18px;border-radius:var(--ml-radius-md);font-size:.82rem;font-weight:600;cursor:pointer;border:none}.mathslab-scope .ml-show-answers-btn{background:var(--ml-primary);color:#fff}.mathslab-scope .ml-show-answers-btn:hover{background:var(--ml-primary-dark)}.mathslab-scope .ml-print-btn{background:var(--ml-border-light);color:var(--ml-text-secondary);border:1px solid var(--ml-border)}.mathslab-scope .ml-knowledge-section{padding:24px 0}.mathslab-scope .ml-knowledge-title{font-size:1.2rem;font-weight:800;color:var(--ml-text);margin:0 0 16px;padding-bottom:8px;border-bottom:2px solid var(--ml-border-light)}.mathslab-scope .ml-knowledge-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}.mathslab-scope .ml-knowledge-card{display:flex;gap:12px;padding:14px 16px;border-radius:var(--ml-radius-md);border:1px solid}.mathslab-scope .ml-knowledge-technique{background:#eff6ff;border-color:#bfdbfe}.mathslab-scope .ml-knowledge-real_world{background:#ecfdf5;border-color:#a7f3d0}.mathslab-scope .ml-knowledge-resource{background:#fef3c7;border-color:#fde68a}.mathslab-scope .ml-knowledge-card-icon{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:800;flex-shrink:0;color:#fff}.mathslab-scope .ml-knowledge-technique .ml-knowledge-card-icon{background:#2563eb}.mathslab-scope .ml-knowledge-real_world .ml-knowledge-card-icon{background:#059669}.mathslab-scope .ml-knowledge-resource .ml-knowledge-card-icon{background:#d97706}.mathslab-scope .ml-knowledge-card-body{flex:1;min-width:0}.mathslab-scope .ml-knowledge-card-label{font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;margin-bottom:3px}.mathslab-scope .ml-knowledge-technique .ml-knowledge-card-label{color:#2563eb}.mathslab-scope .ml-knowledge-real_world .ml-knowledge-card-label{color:#059669}.mathslab-scope .ml-knowledge-resource .ml-knowledge-card-label{color:#d97706}.mathslab-scope .ml-knowledge-card-body h3{font-size:.85rem;font-weight:700;color:var(--ml-text);margin:0 0 4px}.mathslab-scope .ml-knowledge-card-body p{margin:0;font-size:.8rem;color:var(--ml-text-secondary);line-height:1.5}.mathslab-scope .ml-quiz-layout{display:grid;grid-template-columns:260px 1fr;gap:0;margin:-2rem -2.5rem;min-height:100vh}.mathslab-scope .ml-quiz-sidebar-panel{background:var(--ml-surface);border-right:1px solid var(--ml-border);padding:20px;position:sticky;top:56px;height:calc(100vh - 56px);overflow-y:auto}.mathslab-scope .ml-quiz-sidebar-header{margin-bottom:16px}.mathslab-scope .ml-quiz-sidebar-label{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--ml-primary)}.mathslab-scope .ml-quiz-sidebar-title{font-size:1rem;font-weight:700;color:var(--ml-text);margin:4px 0 0}.mathslab-scope .ml-quiz-mode-actions{margin-top:16px}.mathslab-scope .ml-quiz-main{padding:24px 32px;max-width:800px}.mathslab-scope .ml-quiz-top-bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;padding:12px 16px;background:var(--ml-surface);border:1px solid var(--ml-border);border-radius:var(--ml-radius-md)}.mathslab-scope .ml-quiz-timer{display:flex;align-items:center;gap:8px}.mathslab-scope .ml-timer-icon{font-weight:700;color:var(--ml-primary)}.mathslab-scope .ml-timer-value{font-family:var(--ml-font-mono);font-size:1.1rem;font-weight:700;color:var(--ml-text)}.mathslab-scope .ml-quiz-progress{display:flex;align-items:center;gap:10px}.mathslab-scope .ml-quiz-progress-text{font-size:.82rem;color:var(--ml-text-secondary);white-space:nowrap}.mathslab-scope .ml-quiz-progress-bar{width:120px;height:6px;background:var(--ml-border-light);border-radius:3px;overflow:hidden}.mathslab-scope .ml-quiz-progress-fill{height:100%;background:var(--ml-primary);border-radius:3px;transition:width .3s}.mathslab-scope .ml-question-grid{margin-bottom:16px}.mathslab-scope .ml-question-grid-title{font-size:.82rem;font-weight:700;color:var(--ml-text-secondary);margin:0 0 10px}.mathslab-scope .ml-question-grid-items{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}.mathslab-scope .ml-qg-btn{width:36px;height:36px;border-radius:var(--ml-radius-sm);border:1.5px solid var(--ml-border);background:var(--ml-surface);font-size:.8rem;font-weight:600;color:var(--ml-text-secondary);cursor:pointer;transition:all .15s}.mathslab-scope .ml-qg-btn:hover{border-color:var(--ml-primary);color:var(--ml-primary)}.mathslab-scope .ml-qg-btn.current{background:var(--ml-primary);border-color:var(--ml-primary);color:#fff}.mathslab-scope .ml-qg-btn.answered{background:#d1fae5;border-color:#a7f3d0;color:#047857}.mathslab-scope .ml-qg-btn.answered.current{background:var(--ml-primary);border-color:var(--ml-primary);color:#fff}.mathslab-scope .ml-qg-legend{display:flex;gap:12px;margin-top:10px}.mathslab-scope .ml-legend-item{display:flex;align-items:center;gap:4px;font-size:.72rem;color:var(--ml-text-light)}.mathslab-scope .ml-legend-dot{width:8px;height:8px;border-radius:50%;background:var(--ml-border)}.mathslab-scope .ml-legend-dot.answered{background:#a7f3d0}.mathslab-scope .ml-legend-dot.current{background:var(--ml-primary)}.mathslab-scope .ml-question-card{background:var(--ml-surface);border:1px solid var(--ml-border);border-radius:var(--ml-radius-lg);padding:28px}.mathslab-scope .ml-question-card-header{margin-bottom:16px}.mathslab-scope .ml-question-badge{font-size:.78rem;font-weight:700;color:var(--ml-primary);text-transform:uppercase;letter-spacing:.5px}.mathslab-scope .ml-question-main-content{display:flex;gap:20px}.mathslab-scope .ml-question-body-area{flex:1}.mathslab-scope .ml-question-text{font-size:1rem;line-height:1.7;color:var(--ml-text);margin-bottom:20px}.mathslab-scope .ml-question-mixed-text,.mathslab-scope .ml-question-plain-text{margin:0;font-size:1rem;line-height:1.7}.mathslab-scope .ml-question-diagram-column{width:200px;flex-shrink:0}.mathslab-scope .ml-question-options-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.mathslab-scope .ml-option-card{display:flex;align-items:center;gap:10px;padding:10px 14px;border:1.5px solid var(--ml-border);border-radius:var(--ml-radius-md);cursor:pointer;transition:all .15s}.mathslab-scope .ml-option-card:hover,.mathslab-scope .ml-option-card.selected{border-color:var(--ml-primary);background:#eef2ff}.mathslab-scope 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