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.boundary{gap:var(--space-1)}.outcome-diagram{width:100%;max-width:100%;margin:0 auto}.example-shell{grid-template-columns:.82fr 1.18fr;align-items:start;gap:48px;display:grid}.example-shell .token{min-width:48px;padding-left:12px;padding-right:12px}.control-row{gap:var(--space-2);margin:var(--space-3) 0 var(--space-4);flex-wrap:wrap;display:flex}.control-row button{appearance:none;border:2px solid var(--rule);color:var(--ink);font:inherit;font-family:Config Variable,system-ui,sans-serif;font-size:var(--type-meta);font-variation-settings:var(--axis-strong);cursor:pointer;background:0 0;border-radius:6px;padding:9px 16px}.control-row button[aria-pressed=true],.control-row button.primary{border-color:var(--structure);color:var(--structure);background:var(--structure-soft)}.control-row button:disabled{cursor:default;border-color:var(--rule);color:var(--muted);opacity:.58;background:0 0}.interactive-note{border-top:3px solid var(--rule);padding-top:var(--space-2);min-height:118px}.bp-calculator{gap:var(--space-4);grid-template-rows:1fr auto;width:100%;min-height:468px;display:grid}.bp-display{align-content:center;display:grid}.bp-buffer{min-height:190px;padding:var(--space-4) 48px;border-bottom:3px solid var(--rule);background:var(--wash);justify-content:flex-start;align-items:center;gap:4px;display:flex;overflow:hidden}.bp-buffer-empty{color:var(--muted);font-size:var(--type-title);line-height:1}.bp-token{min-width:58px;min-height:112px;color:var(--ink);font-size:var(--type-title);letter-spacing:0;justify-content:center;align-items:center;line-height:1;display:grid;position:relative}.bp-token.operand{min-width:64px;padding:12px 4px}.bp-token.operator{min-width:60px;color:var(--structure);font-variation-settings:var(--axis-code-block-strong)}.bp-operand-stack{grid-template-rows:28px 44px 22px;place-items:center;min-height:94px;display:grid}.bp-operand-value{text-align:center;grid-row:2;min-width:1ch;line-height:1;display:block}.bp-operator-group{grid-template-rows:28px 44px 22px;grid-template-columns:1fr auto 1fr;place-items:center;width:62px;min-height:94px;display:grid}.bp-operator-symbol{text-align:center;min-width:.7em;font-size:var(--type-title);grid-area:2/2;line-height:1;display:block}.bp-power{min-width:1em;color:var(--muted);font-family:Config Mono Var,ui-monospace,SFMono-Regular,Menlo,monospace;font-size:var(--type-footer);font-variation-settings:var(--axis-code-block-strong);align-self:end;line-height:1}.bp-power.left{text-align:right;grid-area:1/1;justify-self:end;margin-right:-2px}.bp-power.right{text-align:left;grid-area:1/3;justify-self:start;margin-left:-2px}.bp-bind-arrow{color:var(--payoff);font-variation-settings:var(--axis-label);grid-row:3;margin-top:-3px;font-family:Config Variable,system-ui,sans-serif;font-size:24px;line-height:1}.bp-bind-arrow.left{justify-self:start}.bp-bind-arrow.right{justify-self:end}.bp-bind-arrow.tie{color:var(--problem)}.bp-keypad{gap:var(--space-2);grid-template-columns:repeat(4,minmax(0,1fr));display:grid}.bp-key-row{display:contents}.bp-keypad button{appearance:none;border:2px solid var(--rule);color:var(--ink);min-height:50px;font-family:Config Variable,system-ui,sans-serif;font-size:var(--type-meta);font-variation-settings:var(--axis-strong);cursor:pointer;background:0 0;border-radius:6px;padding:8px 16px}.bp-keypad button:hover,.bp-keypad button:focus-visible{border-color:var(--structure);background:var(--structure-soft);color:var(--structure)}.trace-board{gap:var(--space-3);display:grid}.trace-code{--code-font-size:var(--type-meta);--code-line-height:1.4}.trace-controls{margin-bottom:0}.trace-line{width:max-content}.trace-line.active{background:var(--structure-soft)}.trace-line.active code{color:var(--structure);font-variation-settings:var(--axis-code-block-strong)}.trace-state{gap:var(--space-2);grid-template-columns:repeat(3,1fr);margin-top:0;display:grid}.trace-side{align-content:start;gap:var(--space-4);display:grid}.trace-input,.trace-state-panel,.trace-stack-panel{gap:var(--space-2);display:grid}.trace-side .label-row{margin-bottom:0}.trace-input .token-flow{gap:var(--space-1);min-height:50px;margin-top:0}.trace-input .token{min-width:40px;font-size:var(--type-meta);padding:5px 10px}.trace-input .token.consumed{color:var(--muted);border-bottom-color:var(--muted);opacity:.55}.trace-input .token.pending{color:var(--ink-soft)}.trace-input .token.end{min-width:54px;color:var(--muted);border-bottom-style:dashed}.trace-input .token.end.current{color:var(--structure);border-bottom-style:solid}.trace-input .k-arrow{font-size:var(--type-meta)}.trace-prompt{min-height:calc(var(--type-footer) * 1.35);color:var(--muted)}.trace-stack{--code-font-size:var(--type-footer);--code-line-height:1.4;--code-line-padding-x:6px;width:min(100%,520px);min-height:calc(var(--code-font-size) * var(--code-line-height) * 3)}.stack-frame{width:max-content;max-width:100%;margin-left:calc(var(--stack-depth,0) * 18px)}.stack-frame code{border-bottom:2px solid var(--rule)}.stack-frame.is-top{background:var(--structure-soft)}.stack-frame.is-top code{color:var(--structure);font-variation-settings:var(--axis-code-block-strong)}.state-cell{border-top:2px solid var(--rule);padding-top:var(--space-1)}.state-cell strong{color:var(--structure);font-family:Config Variable,system-ui,sans-serif;font-size:var(--type-footer);font-variation-settings:var(--axis-label);text-transform:uppercase;margin-bottom:2px;display:block}.state-cell .k-code{font-size:var(--type-meta);line-height:1.2}.rule-playground{grid-template-columns:.82fr 1.18fr;align-items:start;gap:58px;display:grid}.rule-playground>*{min-width:0}.rule-fragment{display:none}.rule-fragment.active{display:grid}.takeaway-triangle{gap:var(--space-5);margin-top:var(--space-6);grid-template-columns:repeat(3,1fr);max-width:1050px;display:grid}.takeaway-node{border-top:4px solid var(--structure);padding-top:var(--space-2)}.title-grid{gap:var(--space-5);grid-template-columns:1fr .85fr;align-items:start;height:100%;display:grid}.title-grid:before{display:none}.title-flow{gap:var(--space-4);margin-top:88px;display:grid}.title-mark{color:var(--mark-color);font-variation-settings:"wdth" 96, "wght" 720, "slnt" 9;font-style:normal;display:inline-block;position:relative}.title-mark.simple{--mark-color:var(--payoff);--mark-tilt:-.6deg;--mark-offset:-.03em}.title-mark.decent{--mark-color:var(--structure);--mark-tilt:.45deg;--mark-offset:-.06em}.title-mark:after{--title-underline-mask:url("data:image/svg+xml,%3Csvg width='240' height='36' viewBox='0 0 240 36' 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1fr;align-items:baseline;display:grid}.spacer-2{height:var(--space-2)}.spacer-3{height:var(--space-3)}.spacer-4{height:var(--space-4)}.spacer-5{height:var(--space-5)}@media print{body{background:#fff;padding:0;overflow:visible}#stage{width:var(--slide-w);height:auto;box-shadow:none;position:static;transform:none!important}.slide{box-shadow:none;page-break-after:always;margin:0;display:block;position:relative}.slide-header{margin-bottom:var(--space-4);position:static}.slide-body{height:auto;display:block}@page{size:13.333in 7.5in;margin:0}}