.practice-space{max-width:1040px;margin:auto;padding:2.5rem 2.5rem 5rem;line-height:1.6}.pa-heading{display:flex;justify-content:space-between;gap:1rem;align-items:center;flex-wrap:wrap}.pa-heading h1{font-size:2rem;font-weight:500;margin:.25rem 0 1.25rem}.pa-heading .eyebrow{margin:0}.pa-tabs{display:flex;gap:.6rem;flex-wrap:wrap;padding-bottom:1.5rem;border-bottom:1px solid var(--line)}.pa-tabs button[aria-pressed=true]{border-color:var(--blue);color:var(--blue);box-shadow:inset 0 -2px var(--blue)}#pa-workspace{padding-top:1.5rem;max-width:56rem}.pa-stage{font-size:.875rem;color:var(--muted);margin:0 0 .35rem}.practice-space h2{font-size:1.5rem;font-weight:500;margin:0 0 1rem}.pa-task{font-size:1.125rem;margin:0 0 1.5rem}.pa-prediction{border:0;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.75rem}.pa-prediction legend{margin-bottom:.6rem}.pa-prediction button[aria-pressed=true],.pa-reasons button[aria-pressed=true]{border-color:var(--blue);color:var(--blue)}.pa-rectangles{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.5rem;margin:0 0 1.5rem}.pa-model{padding:1rem;border:1px solid var(--line);min-width:0}.pa-model h3{font-weight:500;margin:0;font-size:1rem}.pa-rectangle{width:100%;height:clamp(145px,24vw,235px);display:block;color:var(--blue)}.pa-rectangle text{font:20px Arial,sans-serif;fill:var(--ink)}.pa-model:nth-child(2) .pa-rectangle{color:var(--green)}.pa-measures{font-size:.9375rem;margin:0 0 1rem}.pa-stepper{margin:.75rem 0}.pa-stepper>span{font-size:.875rem}.pa-stepper>div{display:grid;grid-template-columns:44px minmax(0,1fr) 44px;gap:.5rem;margin-top:.2rem}.practice-space input,.practice-space select{font:inherit;min-height:44px;width:100%;min-width:0;background:#fff;color:var(--ink);border:1px solid #a8afb9;border-radius:4px;padding:.6rem}.pa-stepper input{text-align:center}.pa-stepper button{padding:0;font-size:1.35rem}.pa-feedback{border-left:3px solid var(--blue);padding:.75rem 1rem;margin:1rem 0;color:var(--ink);background:white}.pa-feedback.success{border-color:var(--green)}.pa-support{margin-top:1rem}.pa-reasons{display:grid;gap:.75rem;margin-bottom:1rem}.pa-reasons .button{text-align:left;padding:.8rem 1rem;line-height:1.5;white-space:normal}.pa-evidence{border-block:1px solid var(--line);padding:1rem 0;overflow-wrap:anywhere}.pa-bar{display:flex;gap:3px;min-height:104px;border:1px solid var(--ink);padding:3px}.pa-part{flex:1;min-width:44px;border:1px solid #a8afb9;color:var(--blue);font-size:1.5rem;background:white;min-height:80px}.pa-part.shaded{background:#dce7ff;border-color:var(--blue)}.pa-caption,.pa-original{color:var(--muted);font-size:.9375rem}.pa-equation{padding:2rem .75rem;border-block:1px solid var(--line);text-align:center;font-size:1.65rem;margin:1.5rem 0;overflow-x:auto}.pa-operation{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) auto;align-items:end;gap:1rem}.pa-operation label,.pa-answer{display:flex;flex-direction:column;gap:.4rem;font-size:.9375rem}.pa-answer{max-width:20rem;margin:1.5rem 0}.pa-actions{display:flex;gap:.75rem;flex-wrap:wrap;margin:1rem 0}.pa-history{margin:1rem 0}.pa-history summary{padding:.5rem 0;min-height:44px;cursor:pointer}.pa-history li{padding:.5rem 0}.pa-complete{border-top:2px solid var(--green);padding-top:1rem}.pa-complete h3{font-weight:500;font-size:1.4rem}.practice-entry{display:flex;justify-content:space-between;align-items:center;gap:1rem;border-top:1px solid var(--line);padding:1.25rem 0;margin-top:2rem}.practice-entry strong{font-size:1.25rem;font-weight:500}.practice-entry span{color:var(--muted);font-size:.9375rem}.practice-topic-link{margin-top:1.5rem;border-top:1px solid var(--line);padding:1rem 0;display:block;color:var(--blue);min-height:44px}.privacy-footer{display:flex;justify-content:center;gap:1.5rem;flex-wrap:wrap}.header-actions .practice-nav{font-size:.9375rem;min-height:44px;display:inline-flex;align-items:center}
@media(max-width:600px){.practice-space{padding:1.5rem 1rem 3rem}.pa-tabs{gap:.4rem}.pa-tabs button{flex:1 1 8rem;font-size:.875rem;padding:.65rem .6rem}.pa-rectangles{gap:1rem;grid-template-columns:1fr}.pa-model{padding:.65rem}.pa-stepper>div{gap:.25rem;grid-template-columns:44px minmax(0,1fr) 44px}.pa-stepper input{padding:.3rem;width:100%}.pa-measures{font-size:.875rem}.pa-operation{grid-template-columns:repeat(2,minmax(0,1fr));gap:.65rem}.pa-operation>.button{grid-column:1/-1}.pa-task{font-size:1rem}.practice-entry{align-items:flex-start;flex-direction:column}.pa-rectangle{height:220px}.pa-equation{font-size:1.3rem}}
@media(max-width:360px){.pa-rectangles{grid-template-columns:1fr}.pa-rectangle{height:220px}}
@media(forced-colors:active){.pa-part.shaded{outline:3px solid Highlight;outline-offset:-4px}.pa-feedback,.pa-complete{border-color:CanvasText}}

.apr-discovery{margin-top:2rem;border-top:1px solid var(--line);padding-top:1rem}.apr-discovery .lesson{display:flex;align-items:center;gap:1rem}.apr-picker{display:flex;flex-wrap:wrap;gap:1rem;align-items:end;margin:1.5rem 0}.apr-picker label,.apr-fields label{display:grid;gap:.5rem}.apr-picker select,.apr-fields input{min-height:44px;font-size:1rem}.apr-model{display:block;width:100%;max-width:38rem;height:auto}.apr-model text{font-size:18px}.apr-fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(12rem,1fr));gap:1rem;margin:1rem 0}.apr-fields output{font-variant-numeric:tabular-nums}.apr-reasons{display:grid;gap:1rem}.apr-reasons .button{text-align:left;white-space:normal;padding:1rem;line-height:1.5}.apr-space #apr-feedback{min-height:1.5rem;margin:1rem 0}.apr-space .al-buttons{margin:1.5rem 0}