/* Optional teaching laboratory; all rules are scoped to the added components. */
.animation-panel {
  --anim-tint:#eef5f2;--anim-blue:#27638e;--anim-orange:#aa4a22;--anim-gold:#b57729;
  --anim-focus:#b05717;--anim-steel:#83a8ba;--anim-dark:#244754;--anim-grid:#e0e8e6;
  --anim-s1:4px;--anim-s2:8px;--anim-s3:12px;--anim-s4:16px;--anim-s5:20px;--anim-s6:24px;--anim-s8:32px;
  --anim-radius:8px;--anim-control-radius:4px;--anim-touch:44px;--anim-fast:180ms;
  margin:var(--anim-s6) 0;padding:0;border:1px solid var(--line);border-radius:var(--anim-radius);
  background:var(--paper);color:var(--ink);container-type:inline-size;isolation:isolate;overflow:clip;
}
.animation-panel>summary{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:var(--anim-s1) var(--anim-s3);padding:var(--anim-s4) var(--anim-s5);list-style:none;background:var(--anim-tint);line-height:1.6;min-height:var(--anim-touch);position:relative}
.animation-panel>summary::-webkit-details-marker{display:none}
.animation-panel>summary::after{content:'+';grid-column:2;grid-row:1/4;align-self:center;font:400 1.5rem/1 sans-serif;color:var(--accent)}
.animation-panel[open]>summary::after{content:'−'}
.animation-panel>summary:hover{background:var(--wash)}
.animation-panel>summary:focus-visible{outline-offset:-4px;outline:3px solid var(--anim-focus)}
.anim-kicker{grid-column:1;font-size:.78rem;color:var(--accent);font-weight:700;letter-spacing:.02em}
.anim-summary-title{grid-column:1;font-size:1rem;font-weight:650;overflow-wrap:anywhere}
.anim-title-term{display:block;font-size:.85rem;font-weight:500;white-space:nowrap;overflow-wrap:normal}
.anim-note-chunk{display:inline-block;white-space:nowrap;margin-right:.3em}
.animation-panel .anim-word{white-space:nowrap}
.animation-panel .anim-math-group{display:inline-flex;align-items:center;max-width:100%;white-space:nowrap;vertical-align:middle}
.anim-summary-meta{grid-column:1;font-size:.78rem;font-weight:400;color:var(--muted)}
.anim-availability{font-size:.85rem;color:var(--muted);border-left:2px solid var(--accent);padding-left:12px}
.anim-fallback,.anim-body{padding:var(--anim-s5);font-size:1rem;line-height:1.75}
.animation-panel p{margin:0 0 var(--anim-s3);overflow-wrap:break-word;line-break:strict;text-wrap:pretty}
.animation-panel p:last-child{margin-bottom:0}
.animation-panel button,.animation-panel select{font:inherit;font-size:.85rem;line-height:1.4;min-height:var(--anim-touch);padding:var(--anim-s2) var(--anim-s3);border:1px solid var(--line);border-radius:var(--anim-control-radius);background:var(--paper);color:var(--ink);max-width:100%}
.animation-panel button:hover{border-color:var(--accent);background:var(--anim-tint)}
.animation-panel button:active{transform:translateY(1px)}
.animation-panel button:disabled{opacity:.5;cursor:default;transform:none}
.animation-panel button[aria-pressed=true],.animation-panel .anim-play{background:var(--accent);border-color:var(--accent);color:var(--paper)}
.animation-panel :is(button,select,input,a):focus-visible{outline:3px solid var(--anim-focus);outline-offset:3px}
.anim-modebar,.anim-controls,.anim-camera{display:flex;flex-wrap:wrap;gap:var(--anim-s2);align-items:center}
.anim-modebar{margin-bottom:var(--anim-s4)}
.anim-select-label{display:grid;gap:var(--anim-s1);font-size:.85rem;font-weight:600;min-width:0;margin-bottom:var(--anim-s4)}
.anim-select-label select{width:100%;text-overflow:ellipsis}
.anim-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--anim-s5);align-items:start}
.anim-visual{min-width:0}
.anim-stage{position:relative;background:linear-gradient(145deg,var(--paper),var(--anim-tint));border:1px solid var(--line);border-radius:var(--anim-control-radius);aspect-ratio:8/5;overflow:hidden}
.anim-stage canvas{display:block;width:100%;height:100%;touch-action:pan-y;cursor:grab}
.anim-stage canvas:active{cursor:grabbing}
.anim-camera{padding-top:var(--anim-s2)}
.anim-camera button{font-size:.78rem;padding:var(--anim-s1) var(--anim-s2);flex:1 1 auto}
.anim-model-note{font-size:.78rem;color:var(--muted);margin-top:var(--anim-s2)!important}
.anim-story{min-width:0}
.anim-step-number{font-size:.78rem;letter-spacing:.03em;color:var(--accent);font-weight:700}
.anim-story h3{font-size:1.12rem;margin:var(--anim-s2) 0;line-height:1.5;text-wrap:balance}
.anim-caption{font-size:.9rem;min-height:5em;overflow-wrap:anywhere}
.anim-metric{background:var(--anim-tint);border-left:3px solid var(--accent);padding:var(--anim-s3);margin:var(--anim-s4) 0;font-size:1rem;font-weight:600;font-variant-numeric:tabular-nums;overflow-wrap:break-word;text-wrap:balance}
.anim-parameter{display:grid;gap:var(--anim-s2);font-size:.85rem;padding:var(--anim-s3) 0}
.anim-parameter-label{display:flex;flex-wrap:wrap;justify-content:space-between;gap:var(--anim-s2)}
.anim-parameter output{font-weight:700;color:var(--accent);font-variant-numeric:tabular-nums}
.animation-panel input[type=range]{width:100%;min-width:0;min-height:var(--anim-touch);padding:0;margin:0;accent-color:var(--accent);cursor:pointer}
.anim-transport{margin-top:var(--anim-s5);padding-top:var(--anim-s4);border-top:1px solid var(--line)}
.anim-controls>button{flex:1 1 auto}
.anim-seek-label{display:block;font-size:.78rem;color:var(--muted);margin-top:var(--anim-s3)}
.anim-timeline{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:var(--anim-s1);margin-bottom:var(--anim-s4)}
.animation-panel .anim-step-button{padding:var(--anim-s1);font-size:.85rem;border-radius:var(--anim-control-radius);min-width:0}
.anim-disclaimer{font-size:.78rem;color:var(--muted);margin-top:var(--anim-s3)!important}
.anim-equation{min-width:0;overflow:auto;background:var(--anim-tint);padding:var(--anim-s4);border-left:3px solid var(--accent);font-size:1.08rem;line-height:2;min-height:6rem;margin:var(--anim-s4) 0}
.anim-equation math{max-width:none}
.anim-equation .anim-term-pending{opacity:.78}
.anim-equation .anim-term-active{color:var(--anim-orange);background:var(--warm)}
.anim-equation .anim-formula-active{outline:2px solid var(--anim-gold);outline-offset:3px}
.anim-equation :is(.source-reference,[data-reading-wrapper]){display:inline}
.anim-source-caption{font-size:.9rem}
.animation-panel [hidden]{display:none!important}
.anim-reduced-note{font-size:.85rem;color:var(--muted);padding:var(--anim-s3);background:var(--wash)}
.anim-source-link{display:inline-block;margin-bottom:var(--anim-s3);font-size:.85rem}
.anim-sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
@container (min-width:660px){.anim-grid{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr)}.anim-caption{min-height:7em}}
@container (max-width:390px){.anim-body,.anim-fallback{padding:var(--anim-s3)}.animation-panel>summary{padding:var(--anim-s3)}.anim-controls{display:grid;grid-template-columns:1fr 1fr}.anim-controls>button{width:100%}.anim-caption{min-height:0}.anim-camera{display:grid;grid-template-columns:1fr 1fr}.anim-camera button{width:100%}}
@media(prefers-reduced-motion:reduce){.animation-panel *{animation:none!important;transition:none!important;scroll-behavior:auto!important}.animation-panel button:active{transform:none}}
@media print{.animation-panel:not([open]){display:none}.animation-panel[open]{break-inside:auto;border:1px solid #aaa}.animation-panel .anim-fallback{display:block!important}.animation-panel .anim-body{display:none!important}.animation-panel>summary{background:white}.anim-availability{display:none}}