.arith-sidebar{padding:var(--spacing-4)}.arith-sidebar-section{margin-bottom:var(--spacing-4)}.arith-sidebar-label{font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.05em;cursor:pointer;margin-bottom:0;display:block}.arith-sidebar-sublabel{font-size:var(--font-size-xs);color:var(--color-text-muted);margin-top:var(--spacing-3);margin-bottom:var(--spacing-1);display:block}.arith-section-toggle{align-items:center;gap:var(--spacing-2);cursor:pointer;width:100%;color:inherit;margin-bottom:var(--spacing-1);background:0 0;border:none;padding:0;display:flex}.arith-section-body{padding-left:var(--spacing-1)}.freq-dot{border-radius:50%;flex-shrink:0;width:7px;height:7px;display:inline-block}.freq-dot.freq-always{background:#a855f7}.freq-dot.freq-often{background:#22c55e}.freq-dot.freq-sometimes{background:#f59e0b}.freq-legend{gap:var(--spacing-3);margin-top:var(--spacing-2);color:var(--color-text-muted);font-size:10px;display:flex}.freq-legend-item{align-items:center;gap:4px;display:flex}.arith-generate-btn{width:100%;padding:var(--spacing-3)var(--spacing-4);background:var(--color-accent);color:#fff;border-radius:var(--radius-md);font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);cursor:pointer;transition:all var(--transition-fast);justify-content:center;align-items:center;gap:var(--spacing-2);border:none;display:flex}.arith-generate-btn:hover{background:var(--color-accent-dark);box-shadow:var(--shadow-md);transform:translateY(-1px)}.arith-pill-group{gap:var(--spacing-1);flex-wrap:wrap;display:flex}.arith-pill-group.full-width{grid-template-columns:1fr 1fr;display:grid}.arith-pill{padding:var(--spacing-1)var(--spacing-3);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium);color:var(--color-text-secondary);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);text-align:center}.arith-pill:hover{background:var(--color-surface-hover);border-color:var(--color-border-strong)}.arith-pill.active{color:var(--color-accent-light);border-color:var(--color-accent);background:#4ade8026}.arith-toggle-list{gap:var(--spacing-2);flex-direction:column;display:flex}.arith-toggle-item{align-items:center;gap:var(--spacing-2);font-size:var(--font-size-sm);color:var(--color-text-secondary);cursor:pointer;display:flex}.arith-toggle-item input{accent-color:var(--color-accent)}.arith-print-btn{width:100%;padding:var(--spacing-2)var(--spacing-4);background:var(--color-surface);color:var(--color-text-secondary);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);cursor:pointer;transition:all var(--transition-fast)}.arith-print-btn:hover{background:var(--color-surface-hover);border-color:var(--color-border-strong)}.arith-sidebar-divider{background:var(--color-border);height:1px;margin:var(--spacing-4)0}.arith-types-header{justify-content:space-between;align-items:center;display:flex}.arith-types-count{font-size:var(--font-size-xs);color:var(--color-accent)}.arith-types-actions{gap:var(--spacing-2);margin-bottom:var(--spacing-3);align-items:center;display:flex}.arith-link-btn{color:var(--color-accent);font-size:var(--font-size-xs);cursor:pointer;background:0 0;border:none;padding:0}.arith-link-btn:hover{text-decoration:underline}.arith-types-sep{color:var(--color-text-muted);font-size:var(--font-size-xs)}.arith-categories{gap:var(--spacing-2);flex-direction:column;display:flex}.arith-category{border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden}.arith-category-header{width:100%;padding:var(--spacing-2)var(--spacing-3);background:var(--color-surface);transition:background var(--transition-fast);border:none;justify-content:space-between;align-items:center;display:flex}.arith-category-header:hover{background:var(--color-surface-hover)}.arith-category-toggle{align-items:center;gap:var(--spacing-2);cursor:pointer;color:inherit;background:0 0;border:none;padding:0;display:flex}.arith-chevron{color:var(--color-text-muted);transition:transform var(--transition-fast);font-size:10px;display:inline-block}.arith-chevron.expanded{transform:rotate(90deg)}.arith-category-name{font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--color-text-primary)}.arith-category-right{align-items:center;gap:var(--spacing-2);display:flex}.arith-category-badge{border-radius:var(--radius-full);background:var(--color-surface-hover);color:var(--color-text-muted);padding:1px 6px;font-size:10px}.arith-category-badge.all{color:var(--color-success);background:#22c55e26}.arith-category-check{cursor:pointer;width:14px;height:14px;accent-color:var(--color-accent)}.arith-category-types{padding:var(--spacing-1)var(--spacing-3)var(--spacing-2);flex-direction:column;display:flex}.arith-type-row{justify-content:space-between;align-items:center;padding:3px 0;display:flex;position:relative}.arith-type-label{align-items:center;gap:var(--spacing-2);cursor:pointer;flex:1;min-width:0;display:flex}.arith-type-label input{accent-color:var(--color-accent);flex-shrink:0}.arith-type-label span{color:var(--color-text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:12px;overflow:hidden}.arith-type-label span.selected{color:var(--color-text-secondary)}.arith-type-actions{align-items:center;gap:var(--spacing-1);flex-shrink:0;display:flex}.arith-type-facility{font-size:10px;font-weight:var(--font-weight-semibold);border-radius:var(--radius-sm);padding:0 4px}.arith-type-facility.easy{color:var(--color-success)}.arith-type-facility.medium{color:var(--color-warning)}.arith-type-facility.hard{color:var(--color-danger)}.arith-boost-btn{cursor:pointer;opacity:.3;transition:all var(--transition-fast);background:0 0;border:none;padding:0 2px;font-size:11px}.arith-boost-btn:hover{opacity:.7}.arith-boost-btn.active{opacity:1;filter:drop-shadow(0 0 4px #f59e0b80)}.arith-tooltip{z-index:200;background:var(--color-bg-elevated);border:1px solid var(--color-border-strong);border-radius:var(--radius-lg);padding:var(--spacing-4);width:260px;box-shadow:var(--shadow-lg);pointer-events:none;position:fixed}.arith-tooltip-row.muted{color:var(--color-text-muted);font-style:italic;font-size:var(--font-size-xs)}.arith-type-facility.none{color:var(--color-text-muted);opacity:.4}.arith-tooltip-code{font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);color:var(--color-accent);margin-bottom:var(--spacing-1)}.arith-tooltip-desc{font-size:var(--font-size-sm);color:var(--color-text-primary);line-height:var(--line-height-normal)}.arith-tooltip-divider{background:var(--color-border);height:1px;margin:var(--spacing-3)0}.arith-tooltip-row{font-size:var(--font-size-xs);justify-content:space-between;align-items:center;padding:2px 0;display:flex}.arith-tooltip-row span:first-child{color:var(--color-text-muted)}.arith-tooltip-row span:last-child{color:var(--color-text-primary);font-weight:var(--font-weight-medium)}.reasoning-generate-card{border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--spacing-3);background:var(--color-surface)}.reasoning-preset-note{margin-bottom:var(--spacing-3);font-size:var(--font-size-xs);color:var(--color-text-secondary);padding:var(--spacing-2);border-radius:var(--radius-sm);background:var(--color-bg-elevated)}.reasoning-summary-line{margin:0 0 var(--spacing-2)0;font-size:var(--font-size-xs);color:var(--color-text-secondary)}.reasoning-paper-marks-row{gap:var(--spacing-2);flex-wrap:wrap;align-items:center;display:flex}.reasoning-filter-subsection+.reasoning-filter-subsection{margin-top:var(--spacing-3)}.reasoning-filter-list{margin-top:var(--spacing-2);gap:4px;max-height:220px;padding-right:4px;display:grid;overflow-y:auto}.reasoning-sidebar-search{width:100%;font-size:var(--font-size-xs);padding:8px 10px}.reasoning-mini-badge{border-radius:var(--radius-sm);background:var(--color-surface-hover);color:var(--color-text-muted);white-space:nowrap;text-overflow:ellipsis;max-width:150px;padding:1px 6px;font-size:10px;overflow:hidden}.reasoning-advanced-note{margin:0 0 var(--spacing-2)0;font-size:var(--font-size-xs);color:var(--color-text-secondary)}.reasoning-fit-panel{border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--spacing-3);background:var(--color-bg-elevated);gap:var(--spacing-2);display:grid}.reasoning-fit-panel.in-bounds{background:#22c55e14;border-color:#22c55e59}.reasoning-fit-panel.out-of-bounds{background:#f59e0b14;border-color:#f59e0b73}.reasoning-fit-title{font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);color:var(--color-text-primary);margin:0}.reasoning-fit-recommendations{gap:4px;display:grid}.reasoning-fit-recommendation{font-size:var(--font-size-xs);color:var(--color-text-secondary);margin:0;line-height:1.35}.reasoning-fit-details{gap:6px;display:grid}.reasoning-fit-metric{justify-content:space-between;align-items:baseline;gap:var(--spacing-2);font-size:var(--font-size-xs);color:var(--color-text-secondary);display:flex}.reasoning-fit-metric strong{color:var(--color-text-primary)}.reasoning-fit-relaxations{margin-top:var(--spacing-1);gap:4px;display:grid}.reasoning-fit-relaxation-item{color:var(--color-text-secondary);margin:0;font-size:11px;line-height:1.3}.compact-question{align-items:flex-start;gap:var(--spacing-3);padding:var(--spacing-3)0;border-bottom:1px solid var(--color-border);display:flex}.compact-question:last-child{border-bottom:none}.compact-q-text{color:var(--color-text-primary);font-size:1.2rem}.compact-q-number{font-size:var(--font-size-sm);color:var(--color-text-muted);background:var(--color-surface);border-radius:var(--radius-sm);text-align:center;flex-shrink:0;min-width:2rem;padding:4px 8px;font-weight:700}.compact-answer-inline{color:#ef4444;white-space:nowrap;font-size:1.2rem;font-weight:700}.compact-info-tags{flex-wrap:wrap;gap:4px;margin-top:0;display:flex}.compact-tag{border-radius:var(--radius-sm);padding:1px 6px;font-size:10px;font-weight:500}.compact-tag.tag-year{color:var(--color-accent);background:#4ade8026}.compact-tag.tag-freq-always{color:#a855f7;background:#a855f726}.compact-tag.tag-freq-often{color:var(--color-success);background:#22c55e26}.compact-tag.tag-freq-sometimes{color:var(--color-warning);background:#f59e0b26}.compact-tag.tag-code{background:var(--color-surface);color:var(--color-text-muted)}.compact-marks{font-size:var(--font-size-xs);color:var(--color-text-muted);flex-shrink:0}.compact-question-meta{align-items:flex-end;gap:var(--spacing-2);flex-direction:column;flex-shrink:0;margin-left:auto;display:flex}.arith-question-qr{border-radius:var(--radius-sm);background:#fff;border:1px solid #6b728059;display:block}.arith-question-qr-link{text-decoration:none;display:inline-flex}.arith-question-qr--compact{width:64px;height:64px;padding:4px}.worksheet-compact-grid{align-content:start}.worksheet-page .compact-question{border-bottom:1px solid #e5e7eb}.worksheet-page .compact-q-text{color:#111827}.worksheet-page .compact-q-number{color:#374151;background:#f3f4f6}.worksheet-page .compact-answer-inline,.worksheet-page .reasoning-answer{color:#b91c1c}.worksheet-page .compact-marks{color:#6b7280}.worksheet-page .compact-tag.tag-code{color:#4b5563;background:#f3f4f6}.sats-paper{--sats-square-size:22px;gap:var(--spacing-3);flex-direction:column;display:flex}.sats-question-row{grid-template-columns:calc(var(--sats-square-size)*3)calc(var(--sats-square-size)*21)calc(var(--sats-square-size)*3);background:#fff;border:1px solid #6b7280;display:grid}.sats-question-row.one-mark{min-height:calc(var(--sats-square-size)*8)}.sats-question-row.two-mark{min-height:calc(var(--sats-square-size)*12)}.sats-col{min-width:0}.sats-col-meta{padding-top:var(--spacing-3);background:#f3f4f6;border-right:1px solid #6b7280;flex-direction:column;justify-content:flex-start;align-items:center;display:flex}.sats-q-number{font-size:2rem;font-weight:var(--font-weight-bold);color:var(--color-brand-blue-dark);line-height:1}.sats-method-label{margin-top:auto;margin-bottom:var(--spacing-4);padding:0 var(--spacing-2);text-align:center;font-size:1.9rem;line-height:1.2;font-weight:var(--font-weight-semibold);color:#1f2937}.sats-col-work{flex-direction:column;display:flex;position:relative}.sats-q-prompt{min-height:calc(var(--sats-square-size)*3);padding:var(--spacing-2)var(--spacing-4);color:#111827;background:#fff;border-bottom:1px solid #d1d5db;align-items:center;font-family:Lexend,Inter,sans-serif;font-size:1.6rem;display:flex}.sats-q-prompt sup{vertical-align:super;font-size:.75em;line-height:0}.sats-question-row.two-mark .sats-q-prompt{background-image:linear-gradient(#d1d5db 1px,#0000 1px),linear-gradient(90deg,#d1d5db 1px,#0000 1px);background-size:var(--sats-square-size)var(--sats-square-size)}.sats-inline-tags{top:var(--spacing-2);right:var(--spacing-2);z-index:4;flex-wrap:wrap;justify-content:flex-end;gap:4px;display:flex;position:absolute}.tag-facility-easy{color:#16a34a!important;background:#22c55e26!important}.tag-facility-medium{color:#d97706!important;background:#f59e0b26!important}.tag-facility-hard{color:#dc2626!important;background:#ef444426!important}.sats-working-grid{width:100%;min-height:calc(var(--sats-square-size)*5);background-color:#fff;background-image:linear-gradient(#d1d5db 1px,#0000 1px),linear-gradient(90deg,#d1d5db 1px,#0000 1px);background-size:var(--sats-square-size)var(--sats-square-size);padding:var(--spacing-2);flex:1;position:relative}.sats-question-row.two-mark .sats-working-grid{min-height:calc(var(--sats-square-size)*9)}.sats-answer-box{right:var(--sats-square-size);bottom:var(--sats-square-size);width:calc(var(--sats-square-size)*5);height:calc(var(--sats-square-size)*2);border:2px solid var(--color-brand-blue-dark);font-family:Lexend,Inter,sans-serif;font-weight:var(--font-weight-bold);color:#1f2937;background:#fff;justify-content:center;align-items:center;font-size:1.1rem;display:flex;position:absolute}.sats-inline-answer-reveal{left:var(--spacing-3);bottom:var(--spacing-3);border-radius:var(--radius-sm);padding:2px var(--spacing-2);font-size:var(--font-size-xs);color:#7f1d1d;background:#fff;border:1px solid #d1d5db;position:absolute}.sats-question-row.inline-answer .missing-box{width:calc(var(--sats-square-size)*5);height:calc(var(--sats-square-size)*2);border:2px solid var(--color-brand-blue-dark);background:#fff;border-radius:0}.sats-col-marks{background:var(--color-brand-blue-lightest);border-left:1px solid #6b7280;justify-content:center;align-items:flex-end;display:flex}.sats-mark-panel{margin-bottom:var(--spacing-3);align-items:center;gap:var(--spacing-1);flex-direction:column;display:flex}.sats-mark-box{width:calc(var(--sats-square-size)*1.6);height:calc(var(--sats-square-size)*1.6);background:#fff;border:2px solid #6b7280}.sats-mark-text{font-size:1.2rem;font-weight:var(--font-weight-semibold);color:#1f2937}.sats-question-row .frac-line{border-top-color:#111827}.sats-question-row .frac-stack{color:#111827}.sats-question-row .missing-box{border-color:var(--color-brand-blue-dark);background:#fff}.arith-sats-paper{--arith-sats-square-size:23px;--arith-sats-line:#6b7280;--arith-sats-grid-line:#c8ced9;--arith-sats-blue:var(--color-brand-blue-dark);gap:var(--spacing-5)}.arith-sats-paper .arith-sats-row{box-sizing:border-box;width:calc(var(--arith-sats-square-size)*27);border:1px solid var(--arith-sats-line);grid-template-columns:calc(var(--arith-sats-square-size)*3)calc(var(--arith-sats-square-size)*21)calc(var(--arith-sats-square-size)*3);background:#fff;max-width:100%;margin:0 auto;display:grid}.arith-sats-paper .arith-sats-row.one-mark,.arith-sats-paper .arith-sats-row.two-mark{min-height:0;height:calc(var(--arith-sats-square-size)*12)}.arith-sats-paper .arith-sats-col-meta{border-right:1px solid var(--arith-sats-line);background:#f3f4f6;flex-direction:column;padding-top:0;display:flex}.arith-sats-paper .arith-sats-meta-top{height:calc(var(--arith-sats-square-size)*3);justify-content:center;align-items:center;display:flex}.arith-sats-paper .arith-sats-meta-bottom{padding:calc(var(--arith-sats-square-size)*.45)calc(var(--arith-sats-square-size)*.3);flex:1;justify-content:center;align-items:flex-end;display:flex}.arith-sats-paper .arith-sats-q-number{color:var(--arith-sats-blue);font-size:1.55rem}.arith-sats-paper .arith-sats-method-label{text-align:center;color:#1f2937;margin:0;padding:0;font-size:.86rem;line-height:1.2}.arith-sats-paper .arith-sats-col-work{border-right:1px solid var(--arith-sats-line)}.arith-sats-paper .arith-sats-q-prompt{box-sizing:border-box;min-height:0;height:calc(var(--arith-sats-square-size)*3);border-bottom:1px solid var(--arith-sats-line);padding:0 calc(var(--arith-sats-square-size)*.55);font-size:1.55rem;line-height:1.05}.arith-sats-paper .arith-sats-prompt-inner{align-items:center;gap:calc(var(--arith-sats-square-size)*.45);width:100%;min-width:0;height:100%;display:flex}.arith-sats-paper .arith-sats-prompt-text{flex:1;align-items:center;min-width:0;display:flex}.arith-sats-paper .arith-sats-inline-tags{top:calc(var(--arith-sats-square-size)*3 + 2px);right:2px}.arith-sats-paper .arith-sats-working-grid{box-sizing:border-box;min-height:0;height:calc(var(--arith-sats-square-size)*9);background-color:#fff;background-image:linear-gradient(var(--arith-sats-grid-line)1px,transparent 1px),linear-gradient(90deg,var(--arith-sats-grid-line)1px,transparent 1px);background-size:var(--arith-sats-square-size)var(--arith-sats-square-size);padding:0}.arith-sats-paper .arith-sats-row.two-mark .arith-sats-q-prompt,.arith-sats-paper .arith-sats-row.two-mark .arith-sats-working-grid{background-image:linear-gradient(var(--arith-sats-grid-line)1px,transparent 1px),linear-gradient(90deg,var(--arith-sats-grid-line)1px,transparent 1px);background-size:var(--arith-sats-square-size)var(--arith-sats-square-size)}.arith-sats-paper .arith-sats-row.two-mark .arith-sats-working-grid{height:calc(var(--arith-sats-square-size)*9)}.arith-sats-paper .arith-sats-answer-box{right:calc(var(--arith-sats-square-size)*1);bottom:calc(var(--arith-sats-square-size)*1);width:calc(var(--arith-sats-square-size)*5);height:calc(var(--arith-sats-square-size)*2);border-color:var(--arith-sats-blue);background:#fff;font-size:1.2rem}.arith-sats-paper .arith-sats-inline-answer-reveal{left:calc(var(--arith-sats-square-size)*.5);bottom:calc(var(--arith-sats-square-size)*.5)}.arith-sats-paper .arith-sats-row.inline-answer .missing-box{width:calc(var(--arith-sats-square-size)*5);height:calc(var(--arith-sats-square-size)*2);border:2px solid var(--arith-sats-blue);background:#fff;border-radius:0}.arith-sats-paper .arith-sats-col-marks{background:var(--color-brand-blue-lightest);box-shadow:inset -1px 0 0 var(--arith-sats-line);border-left:0;flex-direction:column;align-items:stretch;display:flex}.arith-sats-paper 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