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p{font-size:var(--text-sm);line-height:var(--line-height-normal);color:var(--text-primary);margin-bottom:0}.card-body{border-top:var(--border-light);padding:var(--spacing-md);background:var(--bg-color);gap:var(--spacing-sm);flex-direction:column;display:flex}.card-body[hidden]{display:none}.card-section-title{font-family:var(--font-heading);font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.06em;color:var(--text-secondary);margin-bottom:.5rem;font-weight:700}.pitfall-title{color:var(--color-warning)}.card-pitfalls{background:var(--color-warning-light);border:1px solid var(--color-warning-border);border-radius:var(--radius-md);padding:var(--spacing-sm)}.card-lesson-link{font-family:var(--font-heading);font-size:var(--text-sm);color:var(--accent-primary);transition:color 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li:before{content:"–";color:var(--text-muted);position:absolute;left:-1rem}.standard-tags{flex-wrap:wrap;gap:.4rem;display:flex}.standard-tag{font-family:var(--font-heading);font-size:var(--text-xs);color:var(--tag-color,var(--text-secondary));border:1.5px solid var(--tag-color,var(--color-light-gray));cursor:pointer;transition:all var(--transition-fast);letter-spacing:.03em;opacity:.65;background:0 0;border-radius:999px;align-items:center;padding:.25em .6em;font-weight:700;display:inline-flex}.standard-tag:hover{opacity:1;background:color-mix(in srgb, var(--tag-color,var(--color-light-gray)) 12%, transparent)}.standard-tag.is-mastered{opacity:1;color:var(--color-success);background:var(--color-success-light);border-color:var(--color-success-border)}.mt-sm{margin-top:var(--spacing-sm)}.p-sm{padding:var(--spacing-sm)}.notation-tabs{margin-bottom:var(--spacing-sm);gap:.5rem;display:flex}.notation-tab{border:var(--border-light);border-radius:var(--radius-sm);background:var(--bg-surface);cursor:pointer;font-family:var(--font-heading);font-size:var(--text-sm);padding:.4rem 1rem;transition:background .15s,color .15s}.notation-tab.active{background:var(--accent-primary);color:#fff;border-color:var(--accent-primary)}.notation-panel{padding:var(--spacing-sm);border:var(--border-light);border-radius:var(--radius-sm);background:var(--bg-surface)}.notation-bad{color:var(--color-danger);font-style:italic}.secant-viz-wrapper{margin:var(--spacing-md) 0;border:var(--border-light);border-radius:var(--radius-md);padding:var(--spacing-sm);background:var(--bg-surface)}#secant-svg{width:100%;max-width:440px;margin:0 auto;display:block}.secant-controls{text-align:center;margin-top:.75rem}.secant-controls label{font-family:var(--font-heading);font-size:var(--text-sm);color:var(--text-secondary);margin-bottom:.5rem;display:block}.secant-controls input[type=range]{width:80%;max-width:300px;accent-color:var(--accent-primary)}.slope-readout{font-family:var(--font-heading);font-size:var(--text-base);color:var(--text-primary);margin-top:.5rem}.prereq-link-wrap{margin:.6rem 0 0}.prereq-link{border:2px solid var(--color-info);border-radius:var(--radius-lg);color:var(--color-info);padding:.4rem .8rem;font-size:.85rem;font-weight:600;text-decoration:none;display:inline-block}.prereq-link:hover{background:color-mix(in srgb, var(--color-info) 10%, transparent)}.prereq-skipped{color:var(--text-muted);flex-wrap:wrap;align-items:center;gap:.5rem;margin:1rem 0;font-size:.88rem;display:flex}.prereq-show{border:1px solid var(--color-light-gray);border-radius:var(--radius-lg);background:var(--bg-surface);color:var(--text-secondary);font-family:var(--font-body);cursor:pointer;padding:.3rem .7rem;font-size:.82rem}.prereq-show:hover{border-color:var(--accent-primary);color:var(--text-primary)}.contextual-coach{z-index:1100;pointer-events:none;font-family:var(--font-heading);position:fixed;inset:0}.contextual-coach__backdrop{display:none}.contextual-coach__launcher{right:max(var(--spacing-sm), calc((100vw - var(--coach-content-width)) / 2 + var(--coach-content-padding)), env(safe-area-inset-right,0px));bottom:max(var(--spacing-xl), env(safe-area-inset-bottom,0px));width:var(--control-min-height);height:var(--control-min-height);border:2px solid var(--bg-surface);border-radius:var(--radius-round);background:var(--accent-primary);color:var(--bg-surface);box-shadow:var(--shadow-lg);cursor:pointer;pointer-events:auto;transition:background var(--transition-fast), box-shadow var(--transition-fast);place-items:center;padding:0;display:grid;position:fixed}.contextual-coach__launcher:hover{background:var(--accent-primary-hover)}.contextual-coach__launcher:focus-visible,.contextual-coach__close:focus-visible,.contextual-coach__action:focus-visible,.contextual-coach__send:focus-visible,.contextual-coach__input:focus-visible{box-shadow:var(--shadow-focus);outline:none}.contextual-coach__mark{width:100%;height:100%;color:var(--bg-surface);font-size:var(--text-lg);place-items:center;font-weight:700;line-height:1;display:grid}.contextual-coach__panel{top:50%;right:max(var(--spacing-sm), calc((100vw - var(--coach-content-width) - var(--coach-panel-width) - var(--coach-workspace-gap)) / 2));width:min(var(--coach-panel-width), calc(100vw - var(--spacing-sm)));height:min(42rem, calc(100vh - var(--spacing-lg)));height:min(42rem, calc(100dvh - var(--spacing-lg)));border:var(--border-light);border-radius:var(--radius-lg);background:var(--bg-surface);box-shadow:var(--shadow-lg);pointer-events:auto;flex-direction:column;display:flex;position:fixed;overflow:hidden;transform:translateY(-50%)}.contextual-coach__panel[hidden]{display:none}.contextual-coach__panel:focus{outline:none}.contextual-coach.is-open .contextual-coach__launcher{display:none}.contextual-coach__header,.contextual-coach__switch,.contextual-coach__context-card,.contextual-coach__actions,.contextual-coach__form,.contextual-coach__privacy{flex:none}.contextual-coach__header{justify-content:space-between;align-items:flex-start;gap:var(--spacing-sm);padding:var(--spacing-sm);border-bottom:var(--border-light);background:var(--bg-surface-alt);display:flex}.contextual-coach__title-wrap{gap:calc(var(--spacing-xs) / 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var(--spacing-sm);border-bottom:var(--border-light);background:var(--bg-surface);display:flex}.contextual-coach__context-copy{min-width:0;display:grid}.contextual-coach__context-eyebrow{color:var(--text-secondary);font-size:var(--text-xs);text-transform:uppercase;font-weight:600}.contextual-coach__context-label{color:var(--text-primary);font-size:var(--text-sm);text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.contextual-coach__context-excerpt,.contextual-coach__attempt{margin:calc(var(--spacing-xs) / 2) 0 0;color:var(--text-secondary);font-family:var(--font-body);font-size:var(--text-sm);line-height:var(--line-height-normal);-webkit-line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.contextual-coach__attempt{color:var(--text-primary);font-family:var(--font-heading);-webkit-line-clamp:1}.contextual-coach__attempt[hidden]{display:none}.contextual-coach__show-lesson{flex:none}.contextual-coach__messages{gap:var(--spacing-xs);min-height:0;padding:var(--spacing-sm);overscroll-behavior:contain;flex-direction:column;flex:auto;display:flex;overflow-y:auto}.contextual-coach__message{max-width:88%;padding:calc(var(--spacing-xs) * .75) 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(prefers-reduced-motion:reduce){.contextual-coach__launcher{transition:none}}@media print{.contextual-coach{display:none!important}body.has-contextual-coach,body.has-contextual-coach-open{padding-bottom:0;padding-right:0}}.estimation-check-wrapper{margin-block:var(--spacing-md);background:var(--bg-surface);display:block}.estimation-container{background:var(--bg-surface)}.estimation-header{margin-bottom:var(--spacing-xs);align-items:center;display:flex}.estimation-badge{font-family:var(--font-heading);font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.05em;color:var(--accent-blue);background:var(--color-info-light);border:1px solid var(--color-info-border);border-radius:var(--radius-sm);align-items:center;gap:.35rem;padding:.2rem .6rem;font-weight:600;display:inline-flex}.estimation-prompt{font-family:var(--font-heading);font-size:var(--text-base);color:var(--text-primary);margin-block:var(--spacing-xs) 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var(--color-mid-gray);border-radius:var(--radius-sm);flex-direction:column;transition:background .15s,border-color .15s;display:flex}.parsons-list.drag-over{background:var(--color-info-light);border-color:var(--accent-blue)}.parsons-item{align-items:center;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-sm);background:var(--bg-surface);border:1px solid var(--color-mid-gray);border-radius:var(--radius-sm);cursor:grab;user-select:none;transition:all .15s;display:flex}.parsons-item:hover{border-color:var(--accent-orange);box-shadow:var(--shadow-sm)}.parsons-item.dragging{opacity:.5;cursor:grabbing}.parsons-item-correct{border-color:var(--color-success)!important;background:var(--color-success-light)!important}.parsons-item-misplaced{border-color:var(--color-warning)!important;background:var(--color-warning-light)!important}.parsons-item-error{border-color:var(--color-danger)!important;background:var(--color-danger-light)!important}.parsons-drag-handle{color:var(--text-muted);font-size:var(--text-base);cursor:grab;padding-right:.25rem}.parsons-item-content{font-size:var(--text-sm);color:var(--text-primary);flex:1}.parsons-item-controls{gap:.2rem;display:flex}.parsons-ctrl-btn{min-width:44px;min-height:44px;color:var(--text-secondary);background:var(--bg-surface-alt);border:1px solid var(--color-mid-gray);cursor:pointer;border-radius:4px;justify-content:center;align-items:center;padding:0;font-size:.75rem;transition:background .15s;display:inline-flex}.parsons-ctrl-btn:hover:not(:disabled){background:var(--accent-blue);color:var(--bg-surface);border-color:var(--accent-blue)}.parsons-ctrl-btn:disabled{opacity:.3;cursor:not-allowed}.parsons-actions{gap:var(--spacing-xs);display:flex}.parsons-check-btn{padding:var(--spacing-xs) var(--spacing-sm);font-family:var(--font-heading);font-size:var(--text-sm);color:var(--bg-surface);background:var(--accent-orange);border-radius:var(--radius-sm);cursor:pointer;border:none;font-weight:600;transition:background .15s}.parsons-check-btn:hover{background:var(--accent-orange-hover)}.parsons-reset-btn{padding:var(--spacing-xs) var(--spacing-sm);font-family:var(--font-heading);font-size:var(--text-sm);color:var(--text-secondary);background:var(--bg-surface-alt);border:1px solid var(--color-mid-gray);border-radius:var(--radius-sm);cursor:pointer;font-weight:500;transition:all .15s}.parsons-reset-btn:hover{border-color:var(--text-primary);color:var(--text-primary)}.parsons-feedback{margin-top:var(--spacing-md);padding:var(--spacing-sm);border-radius:var(--radius-sm);font-size:var(--text-sm)}.parsons-feedback.feedback-success{background:var(--color-success-light);border:1px solid var(--color-success-border);color:var(--text-primary)}.parsons-feedback.feedback-warning{background:var(--color-warning-light);border:1px solid var(--color-warning-border);color:var(--text-primary)}.parsons-feedback-header{font-family:var(--font-heading);margin-bottom:.35rem;font-weight:600}.parsons-rationales{margin:0;padding-left:1.2rem}.contrasting-cases-wrapper{margin-block:var(--spacing-md);background:var(--bg-surface);display:block}.contrasting-container{padding:0}.contrasting-header{margin-bottom:var(--spacing-xs);align-items:center;display:flex}.contrasting-badge{font-family:var(--font-heading);font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.05em;color:var(--accent-teal);background:color-mix(in srgb, var(--accent-teal) 10%, var(--bg-surface));border:1px solid color-mix(in srgb, var(--accent-teal) 30%, var(--bg-surface));border-radius:var(--radius-sm);align-items:center;gap:.35rem;padding:.2rem .6rem;font-weight:600;display:inline-flex}.contrasting-title{font-family:var(--font-heading);font-size:var(--text-base);color:var(--text-primary);margin-block:var(--spacing-xs);font-weight:600}.contrasting-instructions{font-size:var(--text-sm);color:var(--text-secondary);margin-bottom:var(--spacing-md)}.contrasting-grid{gap:var(--spacing-md);margin-bottom:var(--spacing-md);grid-template-columns:repeat(auto-fit,minmax(280px,1fr));display:grid}.contrasting-card{padding:var(--spacing-md);background:var(--bg-surface-alt);border:1px solid var(--color-light-gray);border-radius:var(--radius-sm);flex-direction:column;transition:border-color .15s,background .15s;display:flex}.contrasting-card.case-correct{border-color:var(--color-success-border);background:var(--color-success-light)}.contrasting-card.case-incorrect{border-color:var(--color-warning-border);background:var(--color-warning-light)}.case-badge{font-family:var(--font-heading);font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.05em;color:var(--accent-teal);margin-bottom:var(--spacing-xs);font-weight:600}.case-stem{font-size:var(--text-sm);line-height:var(--line-height-normal);color:var(--text-primary);margin-bottom:var(--spacing-md);flex:1}.trigger-highlight{background:var(--color-warning-light);border-bottom:2px solid var(--color-warning);color:var(--text-primary);border-radius:2px;padding:0 .2rem;font-weight:600}.case-selector{flex-direction:column;gap:.25rem;display:flex}.case-label{font-family:var(--font-heading);font-size:var(--text-xs);color:var(--text-secondary);flex-direction:column;gap:.25rem;font-weight:600;display:flex}.case-select{padding:var(--spacing-xs) var(--spacing-sm);font-family:var(--font-heading);font-size:var(--text-sm);color:var(--text-primary);background:var(--bg-surface);border:1px solid var(--color-mid-gray);border-radius:var(--radius-sm);cursor:pointer}.case-select:focus-visible{outline:2px solid var(--accent-teal);outline-offset:2px}.contrasting-actions{gap:var(--spacing-xs);display:flex}.contrasting-check-btn{min-height:44px;padding:var(--spacing-xs) var(--spacing-sm);font-family:var(--font-heading);font-size:var(--text-sm);color:var(--bg-surface);background:var(--accent-teal);border-radius:var(--radius-sm);cursor:pointer;border:none;font-weight:600;transition:background .15s}.contrasting-check-btn:hover{background:var(--accent-teal-hover)}.contrasting-feedback{margin-top:var(--spacing-md);padding:var(--spacing-sm);border-radius:var(--radius-sm);font-size:var(--text-sm)}.contrasting-feedback.feedback-success{background:var(--color-success-light);border:1px solid var(--color-success-border);color:var(--text-primary)}.contrasting-feedback.feedback-warning{background:var(--color-warning-light);border:1px solid var(--color-warning-border);color:var(--text-primary)}.contrasting-feedback-header{font-family:var(--font-heading);margin-bottom:.35rem;font-weight:600}.faded-worked-example-wrapper{margin-block:var(--spacing-md);border:1px solid var(--border-color,var(--color-light-gray));border-radius:var(--radius-md);background:var(--bg-surface);box-shadow:var(--shadow-sm);overflow:hidden}.faded-container{padding:var(--spacing-md)}.faded-header{justify-content:space-between;align-items:center;gap:var(--spacing-xs);margin-bottom:var(--spacing-xs);flex-wrap:wrap;display:flex}.faded-badge{font-family:var(--font-heading);font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.05em;color:var(--accent-green);border-radius:var(--radius-sm);background:#788c5d1a;border:1px solid #788c5d4d;align-items:center;gap:.35rem;padding:.2rem .6rem;font-weight:600;display:inline-flex}.faded-level-selector{background:var(--bg-surface-alt);border-radius:var(--radius-sm);border:1px solid var(--color-light-gray);gap:.2rem;padding:.2rem;display:inline-flex}.faded-level-selector .level-btn{font-family:var(--font-heading);font-size:var(--text-xs);color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:4px;padding:.2rem .5rem;font-weight:500;transition:all .15s}.faded-level-selector .level-btn.active{color:var(--text-primary);background:var(--bg-surface);font-weight:600;box-shadow:0 1px 2px #00000014}.faded-title{font-family:var(--font-heading);font-size:var(--text-base);color:var(--text-primary);margin-block:var(--spacing-xs);font-weight:600}.faded-instructions{font-size:var(--text-sm);color:var(--text-secondary);margin-bottom:var(--spacing-md)}.faded-steps-container{gap:var(--spacing-sm);margin-bottom:var(--spacing-md);flex-direction:column;display:flex}.faded-step-card{padding:var(--spacing-md);border-radius:var(--radius-sm);border:1px solid var(--color-light-gray);transition:border-color .15s}.faded-step-card.step-worked{background:var(--bg-surface-alt)}.faded-step-card.step-faded{background:var(--bg-surface);border-color:var(--accent-green);box-shadow:0 1px 3px #788c5d1a}.faded-step-card.step-correct{border-color:var(--color-success-border);background:var(--color-success-light)}.faded-step-card.step-incorrect{border-color:var(--color-warning-border);background:var(--color-warning-light)}.step-card-header{margin-bottom:var(--spacing-xs);justify-content:space-between;align-items:center;display:flex}.step-label{font-family:var(--font-heading);font-size:var(--text-sm);color:var(--text-primary);font-weight:600}.step-type-tag{font-family:var(--font-heading);font-size:var(--text-xs);border-radius:var(--radius-sm);padding:.15rem .5rem;font-weight:600}.step-type-tag.tag-worked{color:var(--text-secondary);background:var(--color-light-gray)}.step-type-tag.tag-faded{color:var(--accent-green);background:var(--color-success-light);border:1px solid var(--color-success-border)}.step-prompt{font-size:var(--text-sm);color:var(--text-primary);margin-bottom:var(--spacing-xs)}.step-solution-display{padding:var(--spacing-xs) var(--spacing-sm);background:var(--bg-surface);border-left:3px solid var(--color-mid-gray);font-size:var(--text-sm);color:var(--text-primary);border-radius:0 var(--radius-sm) var(--radius-sm) 0}.step-mcq-options{gap:var(--spacing-xs);margin-block:var(--spacing-xs);flex-direction:column;display:flex}.step-option-label{align-items:center;gap:var(--spacing-xs);font-size:var(--text-sm);color:var(--text-primary);cursor:pointer;display:flex}.step-typed-input{margin-block:var(--spacing-xs)}.faded-text-input{width:100%;max-width:320px;padding:var(--spacing-xs) var(--spacing-sm);font-family:var(--font-heading);font-size:var(--text-sm);color:var(--text-primary);background:var(--bg-surface);border:1px solid var(--color-mid-gray);border-radius:var(--radius-sm)}.faded-text-input:focus-visible{outline:2px solid var(--accent-green);outline-offset:2px}.step-solution-reveal{margin-top:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-sm);background:var(--color-success-light);border-left:3px solid var(--color-success);font-size:var(--text-sm);color:var(--text-primary);border-radius:0 var(--radius-sm) var(--radius-sm) 0}.faded-actions{gap:var(--spacing-xs);display:flex}.faded-check-btn{padding:var(--spacing-xs) var(--spacing-sm);font-family:var(--font-heading);font-size:var(--text-sm);color:var(--bg-surface);background:var(--accent-green);border-radius:var(--radius-sm);cursor:pointer;border:none;font-weight:600;transition:background .15s}.faded-check-btn:hover{background:var(--accent-green-hover)}.faded-feedback{margin-top:var(--spacing-md);padding:var(--spacing-sm);border-radius:var(--radius-sm);font-size:var(--text-sm)}.faded-feedback.feedback-success{background:var(--color-success-light);border:1px solid var(--color-success-border);color:var(--text-primary)}.faded-feedback.feedback-warning{background:var(--color-warning-light);border:1px solid var(--color-warning-border);color:var(--text-primary)}.faded-feedback-header{font-family:var(--font-heading);margin-bottom:.35rem;font-weight:600}.faded-rationales{margin:0;padding-left:1.2rem}.visual-predictor-wrapper{margin-block:var(--spacing-md);background:var(--bg-surface);display:block}.visual-predictor-container{padding:0}.visual-predictor-header{margin-bottom:var(--spacing-xs);align-items:center;display:flex}.visual-predictor-badge{font-family:var(--font-heading);font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.05em;color:var(--accent-purple);background:color-mix(in srgb, var(--accent-purple) 10%, var(--bg-surface));border:1px solid color-mix(in srgb, var(--accent-purple) 30%, var(--bg-surface));border-radius:var(--radius-sm);align-items:center;gap:.35rem;padding:.2rem .6rem;font-weight:600;display:inline-flex}.visual-predictor-title{font-family:var(--font-heading);font-size:var(--text-base);color:var(--text-primary);margin-block:var(--spacing-xs);font-weight:600}.visual-predictor-prompt{font-size:var(--text-sm);color:var(--text-secondary);margin-bottom:var(--spacing-md)}.visual-predictor-svg-area{padding:var(--spacing-sm);background:var(--bg-surface-alt);border:1px solid var(--color-light-gray);border-radius:var(--radius-sm);margin-bottom:var(--spacing-md)}.visual-predictor-svg{width:100%;height:auto;display:block}.predictor-sliders-grid{gap:var(--spacing-md);margin-bottom:var(--spacing-md);grid-template-columns:repeat(auto-fit,minmax(220px,1fr));display:grid}.predictor-slider-label{font-family:var(--font-heading);font-size:var(--text-xs);color:var(--text-secondary);flex-direction:column;gap:.35rem;font-weight:600;display:flex}.predictor-slider-label input[type=range]{width:100%;accent-color:var(--accent-purple)}.visual-predictor-actions{gap:var(--spacing-xs);display:flex}.visual-predictor-values,.visual-predictor-explain{color:var(--text-secondary);font-size:var(--text-sm)}.visual-predictor-values{margin-bottom:var(--spacing-sm)}.visual-predictor-explain{margin-top:var(--spacing-md);padding:var(--spacing-sm);background:var(--bg-surface-alt);border-radius:var(--radius-sm)}.visual-predictor-submit-btn,.visual-predictor-replay-btn{min-height:44px;padding:var(--spacing-xs) var(--spacing-sm);font-family:var(--font-heading);font-size:var(--text-sm);color:var(--bg-surface);background:var(--accent-purple);border-radius:var(--radius-sm);cursor:pointer;border:none;font-weight:600;transition:background .15s}.visual-predictor-replay-btn{padding:var(--spacing-xs) var(--spacing-sm);color:var(--text-primary);background:var(--bg-surface-alt);border:var(--border-medium);border-radius:var(--radius-sm);cursor:pointer}.visual-predictor-submit-btn:hover{opacity:.9}.visual-predictor-feedback{margin-top:var(--spacing-md);padding:var(--spacing-sm);border-radius:var(--radius-sm);font-size:var(--text-sm)}.visual-predictor-feedback.feedback-success{background:var(--color-success-light);border:1px solid var(--color-success-border);color:var(--text-primary)}.visual-predictor-feedback.feedback-warning{background:var(--color-warning-light);border:1px solid var(--color-warning-border);color:var(--text-primary)}.visual-predictor-feedback-header{font-family:var(--font-heading);margin-bottom:.35rem;font-weight:600}.visual-predictor-legend{gap:var(--spacing-md);font-family:var(--font-mono);font-size:var(--text-xs);margin-block:var(--spacing-xs);display:flex}.legend-pred{color:var(--accent-blue);font-weight:600}.legend-true{color:var(--accent-green);font-weight:600}