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var(--space-5);flex:1;display:flex}.level-toggle{align-items:center;gap:var(--space-3);font-weight:700;display:flex}.level-toggle-track{border:var(--border) solid var(--color-line);display:flex}.level-toggle-track button{min-height:var(--control-min);padding:0 var(--space-4);color:var(--color-muted);cursor:pointer;background:0 0;border:0;align-items:center;gap:.375rem;font-weight:700;display:inline-flex}.level-toggle-track button+button{border-left:var(--border) solid var(--color-line)}.level-toggle-track button:hover{background:var(--color-surface)}.level-toggle-track button[aria-pressed=true]{background:var(--color-selected);color:var(--color-on-selected)}.level-toggle-track button[aria-pressed=true]:before{content:"✓"}.theme-toggle{align-items:center;gap:var(--space-2);min-height:calc(var(--control-min) + 2 * var(--border));padding:0 var(--space-4);border:var(--border) solid var(--color-line);cursor:pointer;background:0 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var(--space-4);font-size:1.125rem}.app-nav a,.app-header-controls{padding:0 var(--space-3)}}.menu-button{align-items:center;gap:var(--space-2);min-width:var(--control-min);padding:0 var(--space-4);cursor:pointer;background:0 0;border:0;margin-left:auto;font-weight:700;display:flex}.menu-button svg{width:1.25rem;height:1.25rem}.menu-button[aria-expanded=true]{background:var(--color-surface)}.menu-button:focus-visible{outline-offset:-6px}.site-menu{z-index:20;max-height:calc(100dvh - var(--app-header-h));padding-bottom:env(safe-area-inset-bottom,0px);border-top:var(--border-thick) solid var(--color-line);border-bottom:var(--border-thick) solid var(--color-line);background:var(--color-bg);position:absolute;top:100%;left:0;right:0;overflow:auto}.site-menu-settings{justify-content:space-between;align-items:center;gap:var(--space-3);padding:var(--space-4);border-bottom:var(--border-thick) solid var(--color-line);flex-wrap:wrap;display:flex}.site-menu .sidebar{border:0}.site-menu .level-toggle-label,.site-menu .theme-toggle-text{clip:auto;white-space:normal;width:auto;height:auto;position:static;overflow:visible}.level-picker{max-width:60rem;padding:var(--space-8) var(--space-7) var(--space-8);margin:0 auto}.level-picker:focus{outline:none}.level-picker h1{margin:0 0 var(--space-2);font-family:var(--font-display);font-size:var(--text-3xl);font-stretch:var(--display-stretch);font-weight:var(--display-weight);line-height:var(--leading-tight)}.level-picker-lede{margin:0 0 var(--space-6);font-size:var(--text-lg);color:var(--color-muted)}.level-picker-choices{gap:var(--space-6);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.level-choice{align-items:stretch;gap:var(--space-3);min-height:18rem;padding:0 0 var(--space-6);border:var(--border-thick) solid 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var(--color-line);flex-direction:column;display:flex}.level-preview-explorer{background:var(--cat-sorting);color:var(--cat-on-sorting);justify-content:flex-start}.level-preview-stripes{grid-template-columns:repeat(4,1fr);height:1.25rem;display:grid}.level-preview-words{padding:var(--space-3) var(--space-6) var(--space-4);font-size:var(--text-xl);font-weight:700}.level-preview-engineer{padding:var(--space-4) var(--space-6);background-color:var(--color-stage);background-image:linear-gradient(var(--color-stage-grid) 1px, transparent 1px), linear-gradient(90deg, var(--color-stage-grid) 1px, transparent 1px);background-size:20px 20px}.level-preview-engineer code{font-size:var(--text-md)}.level-preview-line{padding:var(--space-1) var(--space-2);background:var(--role-comparing);color:var(--role-on-comparing);font-weight:700}.level-preview-bigo{font-weight:700}.level-preview-circled{padding:1px var(--space-3);border:2.5px solid var(--color-note);font-family:var(--font-mono);border-radius:50%;display:inline-block}.level-picker-note{margin:var(--space-6) 0 0;font-size:var(--text-sm);color:var(--color-muted)}@media (width<=720px){.level-picker{padding:var(--space-6) var(--space-4)}.level-picker h1{font-size:var(--text-2xl)}.level-picker-choices{gap:var(--space-4);grid-template-columns:minmax(0,1fr)}.level-choice{min-height:0}.level-choice-current{margin:0 var(--space-6);align-self:flex-start;position:static}}.category-layout{min-height:calc(100vh - var(--header-height));grid-template-columns:14.75rem minmax(0,1fr);display:grid}.sidebar{border-right:var(--border-thick) solid var(--color-line)}.sidebar ol,.sidebar ul{margin:0;padding:0;list-style:none}.sidebar-category{min-height:var(--control-min);border-bottom:var(--border-thin) solid var(--color-rule);color:inherit;align-items:center;gap:.625rem;padding:0 .875rem;font-weight:700;text-decoration:none;display:flex}.sidebar-category:hover{background:var(--color-surface)}.sidebar-number{background:var(--c);width:1.5rem;height:1.5rem;color:var(--on);font-family:var(--font-mono);font-size:var(--text-xs);flex:none;place-items:center;font-weight:700;display:grid}.sidebar-category.open{box-shadow:inset 6px 0 0 var(--c);border-bottom:0}:root[data-level=explorer] .sidebar-category.open{background:var(--c);color:var(--on);box-shadow:none}:root[data-level=explorer] .sidebar-category.open .sidebar-number{background:var(--on);color:var(--c)}.sidebar-category:focus-visible{outline-offset:-4px}.sidebar-algorithms{border-bottom:var(--border-thick) solid var(--color-line);padding:var(--space-1) 0 var(--space-2)!important}.sidebar-algorithms a{color:var(--color-muted);padding:.375rem .875rem .375rem 3rem;text-decoration:none;display:block}.sidebar-algorithms a:hover{color:var(--color-ink);text-decoration:underline}.sidebar-algorithms a:focus-visible{outline-offset:-4px}.sidebar-algorithms a[aria-current=page]{color:var(--color-ink);font-weight:700}.sidebar-algorithms a[aria-current=page]:after{content:" ←" / "";color:var(--color-note)}.category-main{flex-direction:column;min-width:0;display:flex}.category-main:focus{outline:none}.band{align-items:center;gap:var(--space-3) 1.375rem;padding:.875rem var(--space-6);border-bottom:var(--border-thick) solid var(--color-line);background:var(--c);color:var(--on);flex-wrap:wrap;display:flex}.band h1{font-family:var(--font-display);font-size:var(--level-band-title);font-stretch:var(--display-stretch);font-weight:var(--display-weight);margin:0;line-height:1}.band-title{flex:1 1 0;min-width:min(100%,16rem)}.band-title:has(.band-subtitle) h1{font-size:var(--text-3xl)}.band-subtitle{margin:var(--space-1) 0 0;font-size:var(--text-md);font-weight:700}.band-description{font-size:var(--text-lg);margin:0;font-weight:700}@media (width<=900px){.category-layout{grid-template-columns:minmax(0,1fr);min-height:0}.sidebar{border-right:0;border-bottom:var(--border-thick) solid var(--color-line)}.sidebar>ol{grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.sidebar>ol>li:has(.open){grid-column:1/-1}.band h1{font-size:var(--text-2xl)}}.category-page-heading{margin:var(--space-6) var(--space-6) var(--space-3);font-size:var(--text-base);color:var(--color-muted);font-weight:700}.category-page-list{max-width:44rem;margin:0 var(--space-6) var(--space-8);border:var(--border) solid var(--color-line);counter-reset:algorithm;padding:0;list-style:none}.category-page-list li+li{border-top:var(--border-thin) solid var(--color-rule)}.category-page-list a{align-items:center;gap:var(--space-4);min-height:3.5rem;padding:var(--space-2) var(--space-5);color:inherit;font-size:var(--text-lg);counter-increment:algorithm;font-weight:700;text-decoration:none;display:flex}.category-page-list a:before{content:counter(algorithm) / "";border:var(--border-thin) solid var(--color-line);width:1.75rem;height:1.75rem;font-family:var(--font-mono);font-size:var(--text-sm);flex:none;place-items:center;display:grid}.category-page-list a:hover{background:var(--color-surface)}.category-page-list a:focus-visible{outline-offset:-4px}.category-page-names{flex-direction:column;display:flex}.category-page-real-name{font-size:var(--text-sm);color:var(--color-muted);font-weight:400}:root[data-level=explorer] .category-page-list a{min-height:4.25rem;font-size:var(--text-xl)}@media (width<=600px){.category-page-heading,.category-page-list{margin-inline:var(--space-4)}}.simple-page{max-width:48rem;padding:var(--space-8) var(--space-7)}.simple-page:focus{outline:none}.simple-page h1{margin:0 0 var(--space-4);font-family:var(--font-display);font-size:var(--text-3xl);font-weight:850;font-stretch:115%;line-height:1.05}.simple-page p,.simple-page li{font-size:var(--text-lg)}.simple-page a{color:inherit;text-underline-offset:3px;font-weight:700;text-decoration-thickness:2px}@media (width<=600px){.simple-page{padding:var(--space-6) var(--space-4)}.simple-page h1{font-size:var(--text-2xl)}}.home{padding:1.625rem var(--space-7) var(--space-7)}.home:focus{outline:none}.home h1{font-family:var(--font-display);font-size:var(--text-3xl);margin:0 0 .375rem;font-weight:850;font-stretch:115%;line-height:1.05}.home-lede{max-width:66ch;color:var(--color-muted);margin:0 0 1.375rem;font-size:1.125rem}.home-cards{grid-template-columns:repeat(4,minmax(0,1fr));grid-auto-rows:minmax(19.75rem,auto);gap:1.125rem;margin:0;padding:0;list-style:none;display:grid}.home-cards>li{display:flex}.home-card{padding:var(--space-4) 1.125rem;border:var(--border) solid var(--color-line);border-top:var(--border-strip) solid var(--c);background:var(--color-bg);color:inherit;flex-direction:column;flex:1;text-decoration:none;display:flex}.home-card:hover{background:var(--color-surface)}.home-card-head{align-items:center;gap:.625rem;display:flex}.home-card-number{background:var(--c);width:1.875rem;height:1.875rem;color:var(--on);font-family:var(--font-mono);flex:none;place-items:center;font-weight:700;display:grid}.home-card h2{font-family:var(--font-display);font-size:var(--level-card-title);font-weight:800;font-stretch:112%;line-height:var(--leading-tight);margin:0}.home-card-diagram{width:62%;height:5.25rem;margin:.875rem 0 var(--space-3)}.home-card-description{margin:0}.home-card-algorithms{padding-top:var(--space-2);border-top:var(--border-thin) dashed var(--color-rule);font-size:var(--text-sm);color:var(--color-muted);margin:auto 0 0}.home-explorer .home-cards{border-top:var(--border-thick) solid var(--color-line);border-left:var(--border-thick) solid var(--color-line);grid-auto-rows:minmax(20.875rem,auto);gap:0}.home-explorer .home-card{padding:var(--space-5) 1.375rem;border:0;border-right:var(--border-thick) solid var(--color-line);border-bottom:var(--border-thick) solid var(--color-line);background:var(--c);color:var(--on)}.home-explorer .home-card:hover{background:var(--c);box-shadow:inset 0 0 0 var(--border-thick) var(--on)}.home-explorer .home-card:focus-visible{outline:5px solid var(--on);outline-offset:-11px}.home-explorer .home-card-number{background:var(--on);color:var(--c)}.home-explorer .home-card h2{font-stretch:var(--display-stretch);font-weight:var(--display-weight)}.home-explorer .home-card-diagram{height:6rem;margin:auto 0 0 auto}.home-explorer .home-card-description{font-size:1.125rem;font-weight:700}.home-explorer .home-card-algorithms{font-family:var(--font-mono);color:inherit;border:0;margin:0;padding:0;font-size:.9375rem;font-weight:700}@media (width<=1100px){.home-cards{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=600px){.home{padding:var(--space-5) var(--space-4)}.home h1{font-size:var(--text-2xl)}.home-cards{grid-template-columns:minmax(0,1fr);grid-auto-rows:auto}.home-explorer .home-cards{grid-auto-rows:auto}.home-card-diagram,.home-explorer .home-card-diagram{height:4rem}}.code-scroll{min-height:0;overflow:auto}.code-lines{font-family:var(--font-mono);margin:0;padding:0;font-size:.84375rem;line-height:1.6;list-style:none}.code-line{min-height:1.6em;display:flex}.code-number{text-align:right;width:2.75rem;color:var(--color-muted);flex:none;padding-right:.875rem}.code-text{white-space:pre}.code-line.is-active .code-text{background:var(--role-comparing);color:var(--role-on-comparing);font-weight:700}.code-line.is-active:after{content:"← here" / "";color:var(--color-note);font-family:var(--font-text);margin-left:.875rem;font-style:italic;font-weight:700}.stage-view{--gap:clamp(.25rem, 6rem / var(--count), .875rem);flex-direction:column;flex:1;min-height:0;display:flex}.stage-bars,.stage-axis{grid-template-columns:repeat(var(--count), minmax(0, 1fr));gap:var(--gap);display:grid}.stage-bars{min-height:0;padding-top:var(--space-2);border-bottom:var(--border-thick) solid var(--color-line);flex:1;align-items:end}.stage-slot{flex-direction:column;justify-content:flex-end;min-width:0;height:100%;display:flex}.stage-bar{height:calc(2.5rem + (100% - 2.5rem) * var(--h));background:var(--color-bar);color:var(--color-on-bar);font-family:var(--font-mono);font-size:var(--level-bar-label);place-items:start center;padding-top:.375rem;font-weight:700;line-height:1.1;display:grid;overflow:hidden}.stage-bar.is-comparing{background:var(--role-comparing);color:var(--role-on-comparing);outline:var(--border-thick) solid var(--color-line);outline-offset:calc(-1 * var(--border-thick))}.stage-bar.is-swapping{background:var(--role-swapping);color:var(--role-on-swapping);outline:var(--border-thick) solid var(--color-line);outline-offset:calc(-1 * var(--border-thick));z-index:1;position:relative}.stage-bar.is-sorted{background:var(--role-sorted);color:var(--role-on-sorted)}.stage-bar.is-pivot{background:var(--role-pivot);color:var(--role-on-pivot)}.stage-bar.is-zero{height:.375rem;padding-top:0;position:relative;overflow:visible}.stage-bar.is-zero.is-comparing,.stage-bar.is-zero.is-swapping{outline:none}.stage-bar.is-zero .stage-bar-label{color:var(--color-ink);position:absolute;bottom:calc(100% + .25rem);left:50%;transform:translate(-50%)}.stage-caption{min-height:1.4em;font-family:var(--font-mono);font-size:var(--text-sm);color:var(--color-muted);margin:0}.stage-axis{min-height:5.5rem;padding-top:var(--space-1)}.stage-marks{text-align:center;flex-direction:column;align-items:center;gap:.375rem;min-width:0;display:flex}.stage-index{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-muted)}.stage-pointer{margin-top:var(--space-2);padding:2px var(--space-2);background:var(--color-ink);color:var(--color-bg);font-family:var(--font-mono);white-space:nowrap;font-size:.9375rem;font-weight:700;position:relative}.stage-pointer:before{content:"";border:8px solid #0000;border-top:0;border-bottom-color:var(--color-ink);margin-left:-8px;position:absolute;top:-8px;left:50%}:root[data-level=explorer] .stage-pointer{font-family:var(--font-text);font-size:var(--text-md)}.stage-role{padding:1px var(--space-2);font-size:var(--text-xs);white-space:nowrap;font-weight:700}.stage-role.is-comparing{background:var(--role-comparing);color:var(--role-on-comparing)}.stage-role.is-swapping{background:var(--role-swapping);color:var(--role-on-swapping)}.stage-role.is-sorted{background:var(--role-sorted);color:var(--role-on-sorted)}.stage-role.is-pivot{background:var(--role-pivot);color:var(--role-on-pivot)}:root[data-level=explorer] .stage-role{font-size:var(--text-sm)}.trace-scroll{border:var(--border) solid var(--color-line);flex:1;min-height:0;overflow:auto}.trace-table{border-collapse:collapse;width:100%;font-family:var(--font-mono);font-size:var(--level-trace)}.trace-table thead th{z-index:1;padding:.375rem var(--space-2);border-bottom:var(--border) solid var(--color-line);background:var(--color-bg);font-size:var(--text-sm);text-align:center;position:sticky;top:0}.trace-table td{padding:.1875rem var(--space-2);border-top:1px solid var(--color-rule);text-align:center;line-height:1.4}.trace-table th+th,.trace-table td+td{border-left:1.5px solid var(--color-line)}.trace-table tr.starts-group td{border-top:var(--border-thin) dashed var(--color-line)}.trace-table td[data-value=yes] span{background:var(--role-swapping);color:var(--role-on-swapping);padding:0 .375rem;font-weight:700}.trace-table tr.is-current td{background:var(--role-comparing);color:var(--role-on-comparing);font-weight:700}.band-summary{min-width:14rem;font-size:var(--text-sm);flex:0 25rem;font-weight:700;line-height:1.5}.band-summary p{margin:0}:root[data-level=explorer] .band-summary{font-size:var(--text-md);flex-basis:100%;order:3;line-height:1.35}.band-summary .circled{font-family:var(--font-mono);border:2.5px solid;border-radius:50%;padding:0 .5rem;display:inline-block}.numbers-form{justify-content:flex-end;align-items:center;gap:var(--space-2) var(--space-6);flex-wrap:wrap;flex:100%;order:4;font-weight:700;display:flex}.numbers-row,.numbers-presets{justify-content:flex-end;align-items:center;gap:var(--space-2);flex-wrap:wrap;display:flex}.numbers-row label{margin-right:.125rem}.numbers-row input{width:13.5rem;min-height:var(--control-min);padding:0 var(--space-3);border:var(--border) solid var(--color-on-field);background:var(--color-field);color:var(--color-on-field);font-family:var(--font-mono);font-size:var(--text-md);font-weight:700}.numbers-row input[aria-invalid=true]{border-width:var(--border-thick)}.numbers-run,.numbers-presets button{min-height:var(--control-min);padding:0 var(--space-4);border:var(--border) solid var(--color-on-field);cursor:pointer;font-weight:700}.numbers-run{background:var(--color-on-field);color:var(--color-field)}.numbers-presets{font-size:var(--text-sm)}.numbers-presets button{padding:0 var(--space-3);background:var(--color-field);color:var(--color-on-field);font-size:var(--text-sm)}.numbers-run:hover,.numbers-presets button:hover{text-decoration:underline;text-decoration-thickness:2px}.numbers-message{max-width:34rem;font-size:var(--text-sm);text-align:right;flex:100%;margin:0 0 0 auto;line-height:1.4}.numbers-message:not(:empty){padding:var(--space-2) var(--space-3);border:var(--border) solid var(--color-on-field);background:var(--color-field);color:var(--color-on-field);text-align:left}.numbers-message.is-error{border-width:var(--border-thick)}.numbers-message.is-error:before{content:"✗ " / ""}.workspace-grid{flex:1;grid-template-rows:minmax(0,1fr) auto;grid-template-columns:minmax(0,1fr) 29.375rem;min-height:0;display:grid}:root[data-level=explorer] .workspace-grid{grid-template-columns:minmax(0,1fr) 28.125rem}.empty-note{color:var(--color-muted);margin:0;font-style:italic}.empty-note a{color:var(--color-ink);text-underline-offset:3px;font-weight:700;text-decoration-thickness:2px}.workspace-left{border-right:var(--border-thick) solid var(--color-line);flex-direction:column;min-height:0;display:flex}.stage{background-color:var(--color-stage);background-image:linear-gradient(var(--color-stage-grid-major) 1px, transparent 1px), linear-gradient(90deg, var(--color-stage-grid-major) 1px, transparent 1px), linear-gradient(var(--color-stage-grid) 1px, transparent 1px), linear-gradient(90deg, var(--color-stage-grid) 1px, transparent 1px);background-size:100px 100px,100px 100px,20px 20px,20px 20px;flex-direction:column;flex:1;min-height:18rem;padding:1.125rem 1.625rem .375rem;display:flex}.stage>.empty-note{padding:var(--space-2) var(--space-4);background:var(--color-bg);border:var(--border-thin) solid var(--color-line);margin:auto}.panel-head{margin-bottom:var(--space-2);justify-content:space-between;align-items:baseline;display:flex}.panel-head h2{margin:0;font-size:.9375rem;font-weight:700}.panel-head span{font-size:var(--text-sm);color:var(--color-muted);font-style:italic}.code-panel{min-height:15.5rem;padding:var(--space-2) var(--space-5) var(--space-3);border-top:var(--border-thick) solid var(--color-line);flex-direction:column;display:flex}.color-key{gap:var(--space-3) var(--space-7);padding:var(--space-4) var(--space-6);border-top:var(--border-thick) solid var(--color-line);font-size:var(--text-lg);flex-wrap:wrap;margin:0;font-weight:700;list-style:none;display:flex}.color-key li{align-items:center;gap:.625rem;display:flex}.swatch{border:var(--border) solid var(--color-line);flex:none;width:1.625rem;height:1.625rem}.workspace-rail{flex-direction:column;min-height:0;display:flex}.explain{padding:.875rem var(--space-5);border-bottom:var(--border-thick) solid var(--color-line);box-shadow:inset 6px 0 0 var(--c);font-size:var(--level-explain)}.explain-text{margin:0}.explain h2{margin:0 0 var(--space-1);font-size:var(--text-sm);color:var(--color-muted);font-weight:700}.stats{border-bottom:var(--border-thick) solid var(--color-line);grid-template-columns:1fr 1fr;margin:0;display:grid}.stat{padding:.625rem var(--space-5)}.stat+.stat{border-left:var(--border-thick) solid var(--color-line)}.stat dt{font-size:var(--text-sm);color:var(--color-muted);font-weight:700}.stat dd{font-family:var(--font-mono);font-size:var(--level-stat);margin:0;font-weight:700;line-height:1.05}.trace{min-height:12rem;padding:.625rem var(--space-4) var(--space-3);flex-direction:column;flex:1;display:flex}@media (width<=1099px),(height<=699px){.trace .trace-scroll{max-height:22rem}}:root[data-level=explorer] .explain{background:var(--role-comparing);color:var(--role-on-comparing);box-shadow:none;font-weight:700}:root[data-level=explorer] .explain h2,:root[data-level=explorer] .explain .empty-note{color:var(--role-on-comparing)}:root[data-level=explorer] .stat:first-child{background:var(--cat-searching);color:var(--cat-on-searching)}:root[data-level=explorer] .stat:last-child{background:var(--role-swapping);color:var(--role-on-swapping)}:root[data-level=explorer] .stat dt{color:inherit}.controls{border-top:var(--border-thick) solid var(--color-line);grid-column:1/-1;align-items:stretch;min-height:5rem;display:flex}.control{min-width:var(--level-control-width);border:0;border-right:var(--border-thick) solid var(--color-line);background:var(--color-bg);cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:2px;font-weight:700;display:flex}.control svg{width:1.625rem;height:1.625rem}.control kbd{font-size:var(--text-xs)}.control-play{min-width:calc(var(--level-control-width) + 3.75rem);background:var(--c);color:var(--on)}.speed{padding:0 var(--space-6);align-items:center;gap:.875rem;font-weight:700;display:flex}.speed-steps{border:var(--border) solid var(--color-line);display:flex}.speed-steps button{align-items:center;gap:var(--space-1);min-width:3.5rem;min-height:var(--control-min);padding:0 var(--space-2);font-family:var(--font-mono);cursor:pointer;background:0 0;border:0;font-weight:700;display:inline-flex}.speed-steps button+button{border-left:var(--border) solid var(--color-line)}.speed-steps button[aria-pressed=true]{background:var(--color-selected);color:var(--color-on-selected)}.speed-steps button[aria-pressed=true]:before{content:"✓" / ""}.progress{padding:0 var(--space-6);font-family:var(--font-mono);color:var(--color-muted);align-items:center;margin:0 0 0 auto;font-weight:700;display:flex}.controls button:disabled{cursor:not-allowed}.controls .control:disabled:not(.control-play){color:var(--color-muted)}.controls .control[aria-disabled=true]{color:var(--color-muted);cursor:default}.controls .control:not(:disabled,[aria-disabled=true]):hover{background:var(--color-surface)}.controls .control-play:not(:disabled):hover{background:var(--c);box-shadow:inset 0 0 0 var(--border-thick) var(--on)}.controls .control:focus-visible,.speed-steps button:focus-visible{outline-offset:-6px}@media (width>=1100px) and (height>=700px){.category-layout:has(.workspace){height:calc(100vh - var(--header-height));min-height:0}.category-layout:has(.workspace) .sidebar{overflow-y:auto}.workspace{min-height:0}}@media (width<=1099px){.workspace-grid,:root[data-level=explorer] .workspace-grid{grid-template-columns:minmax(0,1fr)}.workspace-left{border-right:0;border-bottom:var(--border-thick) solid var(--color-line)}.controls{flex-wrap:wrap}.control{min-height:4.5rem}.speed,.progress{padding:var(--space-3) var(--space-4)}}@media (width<=600px){.numbers-form{flex:100%;align-items:stretch;margin-left:0}.numbers-row,.numbers-presets{justify-content:flex-start}.numbers-row input{flex:8rem;width:auto;min-width:0}.numbers-message{text-align:left;max-width:none}.control,.control-play{flex:30%;min-width:0}.control-play{border-right:var(--border-thick) solid var(--color-line)}.control:nth-child(3){border-right:0}.speed{border-top:var(--border-thick) solid var(--color-line);flex:100%}}.idea-open{min-height:var(--control-min);padding:0 var(--space-4);border:var(--border) solid var(--color-on-field);background:var(--color-field);color:var(--color-on-field);cursor:pointer;align-self:flex-start;font-weight:700}.idea-open:hover{text-decoration:underline;text-decoration-thickness:2px}.idea{min-height:0;padding:var(--space-3) var(--space-5) 0;border-left:6px solid var(--c);font-size:var(--text-md);flex:1;overflow:auto}.idea:focus{outline:none}.idea-title{margin:0 0 var(--space-1);font-family:var(--font-display);font-size:var(--text-xl);font-stretch:var(--display-stretch);font-weight:var(--display-weight);line-height:var(--leading-tight)}.idea-lead{margin:0 0 var(--space-2);font-weight:700;line-height:1.3}:root[data-level=explorer] .idea-lead{font-size:var(--text-lg)}.idea-points{margin:0}.idea-point{border-top:var(--border-thin) dashed var(--color-line);padding:.375rem 0}.idea-point dt{margin-bottom:.125rem;font-weight:700}.idea-point dd{margin:0;line-height:1.35}.idea-actions{padding:var(--space-2) 0;border-top:var(--border-thin) dashed var(--color-line);background:var(--color-bg);position:sticky;bottom:0}.idea-action{min-height:var(--control-min);padding:0 var(--space-5);border:var(--border-thick) solid var(--color-line);background:var(--color-selected);color:var(--color-on-selected);cursor:pointer;font-weight:700}.category-layout:has(.workspace-phone){height:calc(100dvh - var(--app-header-h));min-height:0;display:block}.workspace-phone{flex-direction:column;height:100%;display:flex;overflow:hidden}.workspace-phone .band{gap:var(--space-1) var(--space-3);padding:var(--space-2) var(--space-4) var(--space-3);flex:none}.workspace-phone .band h1{font-size:var(--text-xl);line-height:1.05}.workspace-phone .band-summary{min-width:0;font-size:var(--text-xs);flex-basis:100%}.workspace-phone .band-summary p+p{display:none}.phone-grid{flex-direction:column;flex:1;min-height:0;display:flex}.phone-grid .stage{min-height:0;padding:var(--space-2) var(--space-3) 0;flex:1}.phone-grid .explain{padding:var(--space-2) var(--space-4);border-top:var(--border-thick) solid var(--color-line);border-bottom:var(--border-thick) solid var(--color-line);font-size:var(--text-md);flex:none;line-height:1.3}.explain-head{justify-content:space-between;align-items:baseline;gap:var(--space-3);display:flex}.phone-grid .explain h2{margin:0}.explain-stats{font-family:var(--font-mono);font-size:var(--text-sm);font-weight:700}.sheet{border-bottom:var(--border-thick) solid var(--color-line);flex-direction:column;flex:1.6;min-height:0;display:flex}.sheet>.idea,.sheet-panel{flex:1;min-height:0}.sheet>.idea{border-left:0}.sheet-panel{flex-direction:column;display:flex}.sheet-panel:focus{outline:none}.sheet-head{justify-content:space-between;align-items:center;gap:var(--space-3);padding:var(--space-1) var(--space-2) var(--space-1) var(--space-4);border-bottom:var(--border-thin) solid var(--color-line);flex:none;display:flex}.sheet-head h2{font-size:var(--text-md);margin:0}.sheet-close{min-width:var(--control-min);min-height:var(--control-min);padding:0 var(--space-4);border:var(--border) solid var(--color-line);background:var(--color-bg);cursor:pointer;font-weight:700}.sheet-body{gap:var(--space-4);min-height:0;padding:var(--space-3) var(--space-4);flex-direction:column;flex:1;display:flex;overflow:auto}.sheet-body:has(.trace-scroll){overflow:hidden}.sheet-body .color-key{border-top:0;flex-direction:column;padding:0}.sheet-body .stats{border:var(--border-thick) solid var(--color-line)}.sheet-body .numbers-form{flex:none;place-content:flex-start;align-items:stretch;margin:0}.sheet-body .numbers-row,.sheet-body .numbers-presets{justify-content:flex-start}.sheet-body .numbers-row label{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.sheet-body .numbers-row input{flex:8rem;width:auto;min-width:0}.sheet-body .numbers-presets span{flex-basis:100%}.sheet-body .numbers-message{text-align:left;max-width:none;margin:0}.pills{padding:var(--space-2) var(--space-3);border-bottom:var(--border-thick) solid var(--color-line);scrollbar-width:none;flex:none;gap:.375rem;display:flex;overflow-x:auto}.pill{min-height:var(--control-min);border:var(--border) solid var(--color-line);background:var(--color-bg);font-size:var(--text-sm);cursor:pointer;flex:1 0 auto;padding:0 .625rem;font-weight:700}.pill[aria-expanded=true]{background:var(--color-selected);color:var(--color-on-selected)}.pill[aria-expanded=true]:before{content:"✓ " / ""}.controls-phone{min-height:0;padding-bottom:env(safe-area-inset-bottom,0px);border-top:0;flex:none;grid-template-columns:1fr 1.4fr 1fr 4rem;display:grid}.controls-phone .control,.controls-phone .control-play{min-width:0;min-height:3.75rem}.controls-phone .control:last-child{border-right:0}.controls-phone .control svg{width:1.375rem;height:1.375rem}.controls-phone .control-speed{font-family:var(--font-mono);font-size:var(--text-md)}.controls-phone .progress{padding:.125rem var(--space-3);border-bottom:var(--border-thin) solid var(--color-line);background:linear-gradient(to right, var(--color-surface) calc(var(--done) * 100%), transparent calc(var(--done) * 100%));font-size:var(--text-xs);grid-column:1/-1;justify-content:flex-end;margin:0;position:relative}@media (orientation:portrait){.phone-grid .stage.is-mini{padding-top:var(--space-1);flex:0 0 4.75rem}.stage.is-mini .stage-caption,.stage.is-mini .stage-axis{display:none}.stage.is-mini .stage-bars{--gap:.25rem;border-bottom-width:var(--border)}.stage.is-mini .stage-bar{height:calc(1.25rem + (100% - 1.25rem) * var(--h));font-size:var(--text-sm);padding-top:.0625rem}.stage.is-mini .stage-bar.is-zero{height:.25rem}}@media (orientation:landscape){.workspace-phone .band{padding:var(--space-1) var(--space-4);flex-wrap:nowrap}.workspace-phone .band h1{font-size:var(--text-lg);white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.workspace-phone .band-title{min-width:0}.workspace-phone .band-summary{flex:none}.phone-grid{grid-template:"stage controls"minmax(0,1fr)"explain controls""pills controls"/minmax(0,1fr) 5.5rem;display:grid}.phone-grid.has-sheet{grid-template-columns:minmax(0,1fr) minmax(0,42%) 5.5rem;grid-template-areas:"stage sheet controls""explain sheet controls""pills sheet controls"}.phone-grid .stage{padding-top:var(--space-1);grid-area:stage}.phone-grid .stage-axis{min-height:3.25rem;padding-top:.125rem}.phone-grid .stage-marks{gap:.125rem}.phone-grid .stage-bar{height:calc(1.875rem + (100% - 1.875rem) * var(--h));font-size:var(--text-lg);padding-top:.25rem}.phone-grid .explain-text{font-size:var(--text-base)}.phone-grid .explain{padding:var(--space-1) var(--space-4);font-size:var(--text-base);border-bottom:0;grid-area:explain}.phone-grid .pills{border-top:var(--border-thick) solid var(--color-line);border-bottom:0;grid-area:pills}.sheet{border-bottom:0;border-left:var(--border-thick) solid var(--color-line);grid-area:sheet}.controls-phone{padding-bottom:env(safe-area-inset-bottom,0px);border-left:var(--border-thick) solid var(--color-line);grid-area:controls;grid-template-rows:auto 1fr 1.3fr 1fr auto;grid-template-columns:1fr}.controls-phone .progress{padding:var(--space-1) 0;text-align:center;grid-column:auto;justify-content:center;font-size:.6875rem}.controls-phone .control,.controls-phone .control-play{min-height:var(--control-min);border-right:0;border-bottom:var(--border-thick) solid var(--color-line)}.controls-phone .control:last-child{border-bottom:0}}:root{--font-display:"Archivo Variable", "Archivo", sans-serif;--font-text:"Atkinson Hyperlegible Next", system-ui, sans-serif;--font-mono:"Atkinson Hyperlegible Mono", ui-monospace, monospace;--display-stretch:125%;--display-weight:900;--text-xs:.8125rem;--text-sm:.875rem;--text-base:1rem;--text-md:1.0625rem;--text-lg:1.1875rem;--text-xl:1.4375rem;--text-2xl:1.6875rem;--text-3xl:2.625rem;--text-4xl:3rem;--leading-tight:1.1;--leading-normal:1.45;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-7:1.75rem;--space-8:2rem;--border-thin:2px;--border:3px;--border-thick:4px;--border-strip:12px;--radius:0;--header-height:60px;--control-min:44px;--color-bg:#fff;--color-surface:#f1f2f4;--color-ink:#15171c;--color-muted:#555b66;--color-line:#15171c;--color-rule:#d9dce1;--color-on-bright:#15171c;--color-on-deep:#fff;--color-selected:#ffc21a;--color-on-selected:#15171c;--color-focus:#2e6bff;--color-note:#d23c2c;--color-field:#fff;--color-on-field:#15171c;--color-field-placeholder:#555b66;--color-stage:#edf3f9;--color-stage-grid:#d4e1ee;--color-stage-grid-major:#b7cbe0;--color-bar:#15171c;--color-on-bar:#fff;--role-comparing:#ffc21a;--role-on-comparing:#15171c;--role-swapping:#c41f74;--role-on-swapping:#fff;--role-sorted:#13a85a;--role-on-sorted:#15171c;--role-pivot:#2e6bff;--role-on-pivot:#fff;--cat-sorting:#ff5436;--cat-on-sorting:#15171c;--cat-searching:#2e6bff;--cat-on-searching:#fff;--cat-linked-lists:#ffc21a;--cat-on-linked-lists:#15171c;--cat-trees:#13a85a;--cat-on-trees:#15171c;--cat-graphs:#00a3b4;--cat-on-graphs:#15171c;--cat-hashing:#ff8a1f;--cat-on-hashing:#15171c;--cat-pattern-matching:#ee4f9b;--cat-on-pattern-matching:#15171c;--cat-dynamic-programming:#8c5a2b;--cat-on-dynamic-programming:#fff;--level-band-title:var(--text-3xl);--level-explain:var(--text-md);--level-stat:var(--text-3xl);--level-trace:var(--text-base);--level-bar-label:1.375rem;--level-control-width:110px;--level-card-title:1.375rem;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-level=explorer]{--level-band-title:var(--text-4xl);--level-explain:var(--text-xl);--level-stat:3.125rem;--level-trace:1.125rem;--level-bar-label:1.875rem;--level-control-width:130px;--level-card-title:var(--text-2xl)}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--color-bg:#1a1c22;--color-surface:#23262e;--color-ink:#f3f3ef;--color-muted:#a9afb9;--color-line:#f3f3ef;--color-rule:#343842;--color-focus:#ffc21a;--color-note:#ff7a6b;--color-stage:#113a5f;--color-stage-grid:#1a4a75;--color-stage-grid-major:#2a6194;--color-bar:#e4e6e1;--color-on-bar:#15171c;--role-swapping:#f06aac;--role-on-swapping:#15171c;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}:root[data-theme=dark]{--color-bg:#1a1c22;--color-surface:#23262e;--color-ink:#f3f3ef;--color-muted:#a9afb9;--color-line:#f3f3ef;--color-rule:#343842;--color-focus:#ffc21a;--color-note:#ff7a6b;--color-stage:#113a5f;--color-stage-grid:#1a4a75;--color-stage-grid-major:#2a6194;--color-bar:#e4e6e1;--color-on-bar:#15171c;--role-swapping:#f06aac;--role-on-swapping:#15171c;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*,:before,:after{box-sizing:border-box}body{background:var(--color-bg);color:var(--color-ink);font-family:var(--font-text);font-size:var(--text-base);line-height:var(--leading-normal);margin:0}button,input,select,textarea{font:inherit;color:inherit}:focus-visible{outline:var(--border-thick) solid var(--color-focus);outline-offset:2px}code,kbd,pre,samp,.mono{font-family:var(--font-mono)}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}