/* The same live mathematical objects, invited into Aligned's reading rhythm. */
.aligned-math [data-problem-explorer]{--pe-surface:color-mix(in srgb,var(--pe-accent) 4%,var(--flagship-page));box-sizing:border-box;max-width:72rem;margin:3.5rem auto 4rem;padding:32px;border:1px solid var(--flagship-rule);background:var(--pe-surface);color:var(--flagship-ink);font-family:var(--flagship-ui);transition:border-color .2s ease-out}
[data-problem-explorer] *,[data-problem-explorer] *::before,[data-problem-explorer] *::after{box-sizing:border-box}
.aligned-math [data-problem-explorer] [hidden]{display:none!important}
.aligned-math [data-pe-highlight=true]{border-color:var(--pe-accent)}
.pe-header{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:24px}
.aligned-math .pe-header .pe-title{font:650 clamp(26px,3.1vw,36px)/1.12 var(--flagship-ui);letter-spacing:-.03em;margin:0;text-wrap:balance;max-width:26ch}
.aligned-math .pe-meta{font:400 12px/1.6 var(--flagship-ui);color:var(--flagship-secondary);margin:10px 0 0}
.pe-timeline-link{display:flex;align-items:center;gap:10px;flex:none;color:var(--flagship-secondary);font:400 11px/1.4 var(--flagship-ui);text-decoration:none;min-height:44px}
.pe-timeline-link img{display:block;width:61px;height:40px;object-fit:contain}.pe-timeline-link span{max-width:6ch}.pe-timeline-link:hover span{text-decoration:underline;text-underline-offset:4px}
.pe-layout{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);align-items:center;gap:36px}
.pe-media{min-width:0;align-self:center}.pe-stage{min-width:0;display:grid;align-items:center;min-height:280px}
.pe-stage[inert]{user-select:none}.pe-stage[inert] :is(svg,canvas){cursor:default}
.aligned-math .pe-media-note{font:400 12px/1.55 var(--flagship-ui);color:var(--flagship-secondary);margin:14px 0 0;max-width:58ch;text-align:center}
.pe-copy{min-width:0}.pe-teaser{max-width:34ch;padding:16px 0}.aligned-math .pe-prompt{font:500 clamp(24px,2.5vw,30px)/1.25 MathNewsreader,Georgia,serif;letter-spacing:-.015em;color:var(--flagship-ink);margin:0 0 24px;text-wrap:balance}
[data-problem-explorer] :is(.pe-explore,.pe-next,.pe-back,.pe-close){font:500 13px/1.4 var(--flagship-ui);min-height:44px;padding:12px 16px;border:1px solid var(--flagship-rule);color:var(--flagship-ink);background:transparent;cursor:pointer;touch-action:manipulation}
[data-problem-explorer] :is(.pe-explore,.pe-next){display:inline-flex;justify-content:center;align-items:center;gap:16px;background:var(--flagship-ink);border-color:var(--flagship-ink);color:var(--flagship-page)}
[data-problem-explorer] :is(.pe-explore,.pe-next):hover{background:var(--flagship-secondary);border-color:var(--flagship-secondary)}
[data-problem-explorer] :is(.pe-explore,.pe-next) svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round}
.aligned-math .pe-invitation{font:400 12px/1.65 var(--flagship-ui);color:var(--flagship-secondary);margin:14px 0 0;max-width:30ch}
.pe-steps{display:flex;gap:20px;border-bottom:1px solid var(--flagship-rule);margin:0 0 24px}
.pe-step{position:relative;flex:1;background:none;border:0;border-bottom:2px solid transparent;margin-bottom:-1px;min-height:46px;padding:10px 0;color:var(--flagship-secondary);font:500 12px/1.4 var(--flagship-ui);cursor:pointer;text-align:left}
.pe-step[aria-current=step]{color:var(--flagship-ink);border-bottom-color:var(--pe-accent)}.pe-step:hover{color:var(--flagship-ink)}
[data-pe-state=open] .pe-layout{align-items:start;min-height:430px}
.pe-panel{min-width:0;outline:none}.pe-panel:focus-visible{outline:2px solid var(--pe-accent);outline-offset:8px}
.aligned-math [data-problem-explorer] .problem-question,.aligned-math [data-problem-explorer] .problem-answer{max-width:none;margin:0;padding:0;border:0}
.aligned-math [data-problem-explorer] :is(.problem-question h2,.problem-answer h3,.problem-play-heading){font:600 23px/1.2 var(--flagship-ui);letter-spacing:-.025em;max-width:30ch;margin:0 0 16px;text-wrap:balance}
.aligned-math [data-problem-explorer] :is(.problem-question p,.problem-answer p,.problem-challenge){font:400 14px/1.65 var(--flagship-ui);color:var(--flagship-secondary);max-width:70ch;margin:12px 0}
.aligned-math [data-problem-explorer] .problem-answer strong{font-weight:600;color:var(--flagship-ink)}
.aligned-math [data-problem-explorer] .problem-credit{font:400 15px/1.8 var(--flagship-ui);color:var(--flagship-secondary)}
.pe-credit .problem-credit>strong:first-child{display:none}
.aligned-math [data-problem-explorer] .problem-answer summary{font-size:13px;line-height:1.5;min-height:44px;padding:8px 0}
.aligned-math [data-problem-explorer] figcaption{font:400 12px/1.7 var(--flagship-ui);color:var(--flagship-secondary);margin-top:24px}
.pe-footer{display:flex;align-items:center;gap:12px;margin-top:24px;padding-top:20px;border-top:1px solid var(--flagship-rule)}
.aligned-math .pe-progress{font:400 12px/1.5 var(--flagship-ui);color:var(--flagship-secondary);margin:0 8px;font-variant-numeric:tabular-nums}.pe-next{margin-left:auto}
[data-problem-explorer] .pe-close{border:0;font-weight:400;text-decoration:underline;text-underline-offset:4px;padding-inline:4px;margin-left:8px}
[data-problem-explorer] .pe-back:disabled{opacity:.4;cursor:default}
/* Fit the incumbent controls to the short guided stage without changing their geometry. */
.pe-media .ud-drawing{width:100%;max-width:560px}.pe-media .ud-measurement{margin-top:0}
.pe-panel .ud-observation{min-height:0;margin:18px 0}.pe-panel .ud-drag-help{text-align:left;margin:14px 0}.pe-panel .ud-position{grid-template-columns:6rem minmax(0,1fr)}
.pe-panel .ud-controls{display:flex;flex-wrap:wrap;gap:12px}.pe-panel .ud-position{display:grid;width:100%}.pe-panel .ud-control-note{font-size:11px}.pe-panel .ud-presets{gap:12px}.pe-panel .ud-presets button{font-size:11px}
.pe-stage .cycle-object{width:100%}.pe-panel .cycle-lesson{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 10px;padding:10px 0}.pe-panel .cycle-lesson p{order:3;width:100%;font-size:12px}.pe-panel .cycle-lesson button{font-size:12px;padding:10px 12px}.pe-panel .cycle-loops{display:grid;grid-template-columns:1fr 1fr;gap:0 12px}.pe-panel .cycle-loops button{gap:5px;font-size:10px;min-height:54px}.pe-panel .cycle-loops button>svg{width:23px}.pe-panel .cycle-progress{min-height:0;margin:14px 0;font-size:12px}.pe-panel .cycle-insight{margin-top:18px;padding-top:14px}.pe-panel .cycle-insight p{font-size:14px}.pe-panel .cycle-reveal{font-size:12px;padding:12px;min-width:0}
.pe-media .es-network{width:100%}.pe-media .es-graph{max-width:360px}.pe-panel .es-controls{display:block}.pe-panel .es-targets{gap:12px}.pe-panel .es-target-description{max-width:none;font-size:13px}.pe-panel .es-feedback{min-height:4.5em;font-size:14px}.pe-panel .es-takeaway{font-size:12px}
.pe-media .fm-scene{max-height:350px}.pe-media .fm-equation{font-size:32px;margin:4px 0 0}.pe-panel .fm-power{justify-content:start;margin:20px 0 12px}.pe-panel .fm-power button{padding:10px 12px;font-size:12px}.pe-panel .fm-view-controls{gap:8px}.pe-panel .fm-number-grid{gap:12px}.pe-panel .fm-number input{width:100%;max-width:90px}.pe-panel .fm-number{font-size:11px}.pe-panel .fm-form-footer{gap:12px;align-items:start}.pe-panel .fm-form-footer p{font-size:11px}.pe-panel .fm-form-footer button{white-space:normal;font-size:11px;max-width:90px}.pe-panel .fm-result{font-size:14px;text-align:left}.pe-panel .fm-unit-note{font-size:12px}
.pe-media .ns-stage{width:100%;height:350px}.pe-media-tools{display:flex;justify-content:flex-end;margin-top:8px}.pe-media-tools button{background:transparent;border:1px solid var(--flagship-rule);color:var(--flagship-ink);min-height:44px;padding:10px 14px;font:400 12px var(--flagship-ui);cursor:pointer}
.pe-panel .ns-chart-panel{display:grid;grid-template-columns:100px minmax(0,1fr);gap:12px;margin-top:18px}.pe-panel .ns-speed-line{align-content:start;padding-top:12px}.pe-panel .ns-speed-line output{font-size:30px}.pe-panel .ns-plot{max-height:210px}.pe-panel .ns-above{grid-column:1/-1;min-height:0;margin:0;font-size:11px}.pe-panel .ns-state-readout{padding:12px 0;gap:12px}.pe-panel .ns-state-readout output{font-size:20px}.pe-panel .ns-progression{margin-top:14px}.pe-panel .ns-progression button{font-size:12px;padding:12px}.pe-panel .ns-progress-help,.pe-panel .ns-clock-note{font-size:11px}.pe-panel .ns-comparison{font-size:12px}.pe-panel .ns-flow-tools{gap:8px;flex-wrap:wrap}.pe-panel .ns-flow-tools button{font-size:11px;min-height:44px}.pe-panel .ns-color-key{font-size:10px}
html[data-aligned-feature-theme=night] [data-problem-explorer]{--pe-surface:color-mix(in srgb,var(--pe-accent) 8%,var(--flagship-page))}
@media(max-width:900px){.aligned-math [data-problem-explorer]{padding:24px}.pe-layout{gap:24px;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.pe-footer{flex-wrap:wrap}.pe-close{margin-left:auto!important}}
@media(max-width:650px){.aligned-math [data-problem-explorer]{padding:20px 16px;margin:40px 0;border-inline:0}.pe-header{gap:14px;margin-bottom:18px}.aligned-math .pe-header .pe-title{font-size:25px}.aligned-math .pe-meta{font-size:11px}.pe-timeline-link{flex-direction:column;gap:4px;font-size:9px}.pe-timeline-link img{width:49px;height:32px}.pe-timeline-link span{max-width:none}.pe-layout{grid-template-columns:1fr;gap:22px}.pe-stage{min-height:0}.pe-teaser{max-width:none;padding:0 0 6px}.aligned-math .pe-prompt{font-size:26px;max-width:24ch;margin-bottom:18px}.aligned-math .pe-invitation{max-width:none}.pe-media-note{font-size:11px!important}.pe-steps{gap:12px;margin-bottom:18px}.pe-step{font-size:11px}.pe-panel{margin-top:0}.aligned-math [data-problem-explorer] :is(.problem-question h2,.problem-answer h3,.problem-play-heading){font-size:22px}.pe-footer{gap:8px;margin-top:20px;padding-top:16px}.pe-footer .pe-close{flex-basis:100%;margin:0!important;text-align:right}.pe-footer .pe-progress{margin:0;font-size:11px}.pe-footer .pe-next{font-size:12px;padding-inline:12px;gap:8px}.pe-media .fm-scene{max-height:280px}.pe-media .fm-equation{font-size:27px}.pe-media .ns-stage{height:260px}.pe-stage .cycle-svg{max-height:290px}.pe-media .ud-drawing{max-width:380px}.pe-media .ud-board{max-height:290px}.pe-media .es-graph{max-width:290px}.pe-panel .cycle-loops button{font-size:11px}.pe-panel .ns-chart-panel{grid-template-columns:95px minmax(0,1fr)}}
@media(prefers-reduced-motion:no-preference){[data-pe-state=open] .pe-panel:not([hidden]){animation:pe-step-reveal 180ms cubic-bezier(.16,1,.3,1)}@keyframes pe-step-reveal{from{opacity:.65;transform:translateY(4px)}to{opacity:1;transform:none}}}
@media print{.aligned-math [data-problem-explorer]{break-inside:auto;background:none}.pe-steps,.pe-footer,.pe-teaser,.pe-timeline-link{display:none!important}.aligned-math [data-problem-explorer] .pe-lessons,.aligned-math [data-problem-explorer] .pe-panel{display:block!important}.pe-layout{display:block}.pe-panel{margin:20px 0}}

/* Shared navigation must outrank the incumbent graph and flow button rules. */
.aligned-math [data-problem-explorer] .pe-step{flex:1;background:transparent;border:0;border-bottom:2px solid transparent;border-radius:0;color:var(--flagship-secondary);font:500 12px/1.4 var(--flagship-ui);padding:10px 0;margin-bottom:-1px;min-height:46px;box-shadow:none}
.aligned-math [data-problem-explorer] .pe-step[aria-current=step]{border-bottom-color:var(--pe-accent);color:var(--flagship-ink)}
.aligned-math [data-problem-explorer] .pe-step:hover{border-bottom-color:var(--pe-accent);color:var(--flagship-ink)}
.aligned-math [data-problem-explorer] .pe-timeline-link{color:var(--flagship-secondary)}
[data-pe-state=teaser] .cycle-object-hint,[data-problem-explorer]:not([data-pe-step="1"]) .cycle-object-hint{display:none}
.pe-challenge-details{margin:0;padding:0;border:0}.pe-challenge-details>summary{display:none}
@media(max-width:650px){
 .aligned-math [data-problem-explorer] .pe-step{font-size:11px}
 .aligned-math .pe-mobile-instruction{font:500 14px/1.55 var(--flagship-ui);color:var(--flagship-ink);margin:0 0 14px;max-width:36ch}
 .pe-mobile-primary{margin:12px 0 0}
 .pe-mobile-primary .fm-power{margin:8px 0 16px;justify-content:center}.pe-mobile-primary .fm-power button{padding:10px 12px;font-size:12px}
 .pe-mobile-primary .fm-number-form{margin-top:14px}.pe-mobile-primary .fm-number-grid{gap:12px}.pe-mobile-primary .fm-number{font-size:11px}.pe-mobile-primary .fm-number input{width:100%;max-width:85px;height:48px}.pe-mobile-primary .fm-form-footer p{font-size:11px}.pe-mobile-primary .fm-form-footer button{font-size:11px}.pe-mobile-primary .fm-view-controls>span{font-size:11px}.pe-mobile-primary .fm-view-controls{margin-top:8px;padding-bottom:10px}
 .pe-mobile-primary .ns-speed-line{display:flex;align-items:baseline;flex-wrap:wrap;gap:6px 12px;font-size:12px;padding:0}.pe-mobile-primary .ns-speed-line output{font-size:32px;white-space:nowrap}.pe-mobile-primary .ns-speed-line span:last-child{flex-basis:100%;font-size:11px}.pe-mobile-primary .ns-progression{margin:14px 0 0;gap:12px}.pe-mobile-primary .ns-progression button{font-size:12px;padding:12px}.pe-mobile-primary .ns-progress-help{font-size:11px}.pe-mobile-primary .ns-state-readout{gap:14px;padding:14px 0}.pe-mobile-primary .ns-state-readout output{font-size:21px}
 .pe-panel .ns-chart-panel{display:block}.pe-panel .ns-plot{max-height:230px}.pe-panel .ns-above{font-size:11px;margin-top:8px}
 .pe-mobile-primary .ud-presets{gap:12px}.pe-mobile-primary .ud-presets button{font-size:11px}.pe-mobile-primary .ud-observation{margin-top:16px;min-height:0}
 .pe-mobile-primary .cycle-actions{margin-top:20px}.pe-mobile-primary .cycle-loops{gap:0 12px}.pe-mobile-primary .cycle-progress{font-size:12px}.pe-mobile-primary .cycle-reveal{font-size:12px;min-width:0}
 .pe-mobile-primary .es-controls{display:block}.pe-mobile-primary .es-target-description{font-size:12px;max-width:none;margin-top:12px}.pe-mobile-primary .es-feedback{font-size:14px;min-height:0;margin:14px 0}.pe-mobile-primary .es-targets{gap:12px}
 .pe-challenge-details{border-top:1px solid var(--flagship-rule);padding-top:4px}.pe-challenge-details>summary{display:list-item;min-height:44px;padding:12px 0;cursor:pointer;font:500 13px/1.5 var(--flagship-ui)}
 .pe-challenge-details .problem-play-heading{margin-top:12px!important}
}