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ul{margin:0;padding-left:1.25rem}.info-section li{margin:3px 0}.info-section li.is-highlighted{border-radius:var(--radius);background:var(--highlight-fill);box-shadow:inset 3px 0 0 var(--accent);margin-left:-.25rem;padding:3px 5px}.case-caption-link{width:auto;height:auto;color:inherit;font:inherit;text-decoration:underline;-webkit-text-decoration-color:var(--accent);text-decoration-color:var(--accent);text-underline-offset:2px;background:0 0;border:0;border-radius:0;padding:0;text-decoration-thickness:1px}.case-caption-link:hover,.case-caption-link:focus-visible{color:var(--accent)}.stage{touch-action:pan-y;flex-direction:column;padding:12px 16px 16px;display:flex}.stage-viewport{flex:1;min-height:0;overflow:hidden}.stage-track{width:300%;min-height:100%;transition:none;display:flex;transform:translate(-33.3333%)}.stage-track.is-next,.stage-track.is-prev{transition:transform .22s 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circle{fill:var(--rb-black);stroke:var(--rb-black-stroke)}svg .node.is-red .key,svg .node.is-red .rb-letter{fill:var(--rb-red-ink)}svg .node.is-black .key,svg .node.is-black .rb-letter{fill:var(--rb-black-ink)}svg .node .halo,svg .node.is-red .halo,svg .node.is-black .halo,svg .node.is-hi .halo,svg .node.is-rot .halo,svg .rot-detached .node .halo{fill:none;stroke:var(--highlight);stroke-width:2.25px}svg .btree-halo{fill:none;stroke:var(--highlight);stroke-width:2.25px;pointer-events:none}svg .rb-letter{font-family:var(--mono);text-anchor:middle;dominant-baseline:central;letter-spacing:.04em;font-size:8px;font-weight:600}svg .nil rect{fill:var(--rb-black);stroke:var(--rb-black-stroke);stroke-width:1.25px}svg .nil.is-double-black rect{stroke:var(--highlight);stroke-width:2.5px}svg .nil-mark{fill:var(--rb-black-ink);font-family:var(--mono);text-anchor:middle;dominant-baseline:central;font-size:9px;font-weight:700}svg .nil-label{fill:var(--muted);font-family:var(--mono);text-anchor:middle;font-size:9px;font-weight:600}svg .nil-edge{stroke-dasharray:3 2}svg .node.is-rot circle:not(.halo){stroke:var(--highlight);stroke-width:2.25px}svg .node.is-red.is-rot circle:not(.halo),svg .node.is-red.is-hi circle:not(.halo){fill:var(--rb-red);stroke:var(--rb-red-stroke);stroke-width:1.25px}svg .node.is-black.is-rot circle:not(.halo),svg .node.is-black.is-hi circle:not(.halo){fill:var(--rb-black);stroke:var(--rb-black-stroke);stroke-width:1.25px}svg .note{fill:var(--danger);font-family:var(--font);font-size:12px;font-weight:500}svg .note-arrow{fill:none;stroke:var(--danger);stroke-width:1.5px}svg .note-arrow-head{fill:var(--danger)}svg .note.note-recolor{fill:var(--accent);font-family:var(--mono);letter-spacing:.02em;font-size:11px;font-weight:600}svg .recolor-transition{fill:none;stroke:var(--accent);stroke-width:1px;stroke-linejoin:round}svg .note-arrow.note-recolor{stroke:var(--accent)}svg .note-arrow-head.note-recolor{fill:var(--accent)}svg .rot-turn-arrow,svg .rot-promotion-arrow,svg .rot-transfer-arrow,svg .delete-move-arrow{fill:none;stroke:var(--rot-arrow);stroke-width:2.25px;stroke-linecap:round;stroke-linejoin:round}svg .rot-promotion-arrow,svg .delete-move-arrow{stroke-width:2.75px}svg .rot-arrow-head{fill:var(--rot-arrow)}svg .rot-detached .node circle:not(.halo){fill:var(--node-fill);stroke:var(--node-stroke);stroke-width:2.25px}svg .rot-detached .node.is-hi circle:not(.halo){fill:var(--highlight-fill)}svg .rot-detached .node.is-red circle:not(.halo){fill:var(--rb-red);stroke:var(--rb-red-stroke)}svg .rot-detached .node.is-black circle:not(.halo){fill:var(--rb-black);stroke:var(--rb-black-stroke)}svg .rot-label{fill:var(--rot-arrow);font-family:var(--mono);letter-spacing:.04em;paint-order:stroke;stroke:var(--paper);stroke-width:3px;font-size:11px;font-weight:700}svg .node.is-delete-target circle,svg .btree-cell.is-delete-target rect{stroke:var(--danger);stroke-width:2.25px;stroke-dasharray:4 3}svg .btree-move-arrow{fill:none;stroke:var(--rot-arrow);stroke-width:2.25px;stroke-linecap:round}svg .btree-move-arrow-head,svg .delete-arrow-head,svg .delete-label{fill:var(--rot-arrow)}svg .key{fill:var(--ink);font-family:var(--mono);text-anchor:middle;dominant-baseline:central;font-size:12px;font-weight:500}svg .bf{fill:var(--muted);font-family:var(--mono);text-anchor:start;font-size:10px}svg .bf.bf-left{text-anchor:end}svg .ht{fill:var(--muted);font-family:var(--mono);text-anchor:middle;font-size:10px}svg .empty-tree{fill:var(--muted);font-family:var(--mono);text-anchor:middle;dominant-baseline:central;font-size:18px}.stage-empty{width:min(100%,42rem);color:var(--muted);margin:auto}.stage-empty-primary{color:var(--ink);margin:0;font-size:16px;font-weight:500}.stage-empty-deletion{margin:8px 0 0;line-height:1.5}.stage-empty-convention{background:var(--node-fill);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:var(--radius);margin:18px 0;padding:12px 14px}.stage-empty-convention h2{color:var(--accent);text-transform:uppercase;letter-spacing:.05em;margin:0 0 6px;font-size:12px;font-weight:600}.stage-empty-convention p{color:var(--ink);margin:0;font-size:13.5px;line-height:1.5}.stage-empty-actions{border-top:1px solid var(--border);margin-top:20px;padding-top:12px}.stage-empty-actions h2{color:var(--ink);margin:0 0 8px;font-size:14px;font-weight:500}.stage-empty-actions ul{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 24px;margin:0;padding-left:1.25rem;line-height:1.4;display:grid}.stage-empty-actions li::marker{color:var(--accent)}.steps{border-left:1px solid var(--border);flex-direction:column;display:flex;overflow:auto}.steps h2{color:var(--muted);border-bottom:1px solid var(--border);margin:0;padding:8px 10px;font-size:12px;font-weight:500}.step{border:0;border-bottom:1px solid var(--border);text-align:left;background:0 0;border-radius:0;grid-template-columns:1.5rem 72px 1fr;align-items:center;gap:6px;width:100%;height:auto;padding:6px 8px;display:grid}.step.is-on{background:var(--highlight-fill)}.step .n{font-family:var(--mono);color:var(--muted);font-size:11px}.step .cap{color:var(--ink);font-size:11px;line-height:1.3}.thumb{width:72px;height:48px;overflow:hidden}.thumb svg{width:72px;height:48px}.print-only{display:none}@media (width<=860px){.workspace{grid-template-columns:1fr;height:auto}.stage{align-self:start;height:auto;padding:10px 12px 12px}.stage-viewport{height:var(--stage-page-height,auto);flex:none;transition:height .16s ease-out}.stage-track{align-items:flex-start;min-height:0}.rail,.steps{border:0}.rail{border-bottom:1px solid var(--border);gap:6px;padding:10px 12px;position:relative}.options-button{border-radius:var(--radius);width:auto;min-width:0;color:var(--ink);align-items:center;gap:6px;margin-left:auto;padding:0 8px;font-size:13px;font-weight:500;display:inline-flex}.options-button span:first-child{font-size:16px}.options-backdrop{z-index:9;background:color-mix(in srgb, var(--ink) 18%, transparent);border:0;border-radius:0;width:100%;height:100%;padding:0;display:block;position:fixed;inset:0}.options-popover{z-index:10;border:1px solid var(--border);border-radius:var(--radius);background:var(--paper);width:min(100% - 24px,18rem);box-shadow:0 12px 32px color-mix(in srgb, var(--ink) 20%, transparent);padding:12px;display:none;position:fixed;top:48px;right:12px}.options-popover.is-open{display:block}.options-popover-heading{align-items:center;margin:-2px 0 10px;display:flex}.options-close{margin-left:auto;display:inline-grid}.options-popover .random-opts{margin-bottom:8px;padding-bottom:8px}.steps{border-top:1px solid var(--border);max-height:40vh}.topbar{flex-wrap:wrap;gap:8px;height:auto;padding:6px 10px}}@media (width<=680px){.options-popover{top:84px}.stage-empty-actions ul{grid-template-columns:1fr}}@media print{.stage>.stage-viewport,.stage>.stage-empty,.info-layer{display:none}.topbar,.rail,.steps{display:none!important}.print-only{display:block}.shell,.page,.workspace,.stage{height:auto;display:block;overflow:visible}.print-sheet{padding:0}.print-sheet header{margin-bottom:12px;font-size:12px}.print-figure{break-inside:avoid;page-break-inside:avoid;margin:0 0 20px}.print-figure figcaption{margin:4px 0 8px;font-size:12px}.print-figure svg{max-width:100%;height:auto}.print-rotation-help{border-top:0;margin-top:4px;padding-top:4px}body.is-workbook-print{color:#000;background:#fff}body.is-workbook-print #app{display:none!important}body.is-workbook-print .workbook-print{display:block}.workbook-page{break-before:page;page-break-before:always}.workbook-print>.workbook-page:first-child{break-before:auto;page-break-before:auto}.workbook-page.is-recto{break-before:right;page-break-before:right}.workbook-prompt{break-inside:avoid;page-break-inside:avoid}.workbook-kicker{margin:0 0 6px;font-size:14px;font-weight:600}.workbook-seq{font-family:var(--mono);margin:0 0 8px;font-size:14px}.workbook-prompt p,.workbook-degree,.workbook-legend{margin:0 0 8px;font-size:12px}.workbook-prompt+.workbook-prompt{border-top:1px solid #888;margin-top:16px;padding-top:12px}.workbook-figure{margin:8px 0 16px}.workbook-figure svg{width:auto;max-width:100%;height:auto;max-height:200mm;display:block}.workbook-page.is-steps .workbook-figure svg{max-height:85mm}}@page{margin:14mm 16mm}