.sn-choice-fieldset{min-width:0;margin:0;padding:0;border:0}.sn-choice-heading{display:flex;align-items:center;gap:.6rem;margin-bottom:.65rem;padding:0;color:var(--sn-ink);font-size:1.1rem;font-weight:800;line-height:1.4}.sn-choice-heading>span{display:grid;flex:none;width:1.55rem;height:1.55rem;place-items:center;border:1px solid var(--sn-border);border-radius:50%;background:var(--sn-surface);color:var(--sn-text-muted);font-size:.8rem}.sn-choice-grid{position:relative;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.35rem;padding:.35rem;border:1px solid var(--sn-border);border-radius:var(--sn-radius-lg);background:color-mix(in srgb,var(--sn-ink) 3%,var(--sn-paper))}.sn-activity-card{position:relative;z-index:1;display:grid;grid-template-rows:minmax(1.4em,max-content) 3.8rem 1fr;gap:.45rem;min-width:0;padding:.8rem .9rem;border:1px solid transparent;border-radius:var(--sn-radius-md);background:transparent;color:var(--sn-ink);text-align:left;font:inherit;cursor:pointer;text-decoration:none}.sn-activity-card[aria-checked=true]{border-color:var(--sn-border);background:var(--sn-surface-raised);box-shadow:var(--sn-shadow-card)}.sn-choice-grid[data-marker-ready] .sn-activity-card[aria-checked=true]{border-color:transparent;background:transparent;box-shadow:none}.sn-activity-card:hover:not([aria-checked=true]):not(:disabled){background:color-mix(in srgb,var(--sn-surface-raised) 65%,transparent)}.sn-activity-card:focus-visible{outline:2px solid var(--sn-action);outline-offset:1px}.sn-activity-card:disabled{opacity:.48;cursor:default}.sn-activity-card__title strong{font-weight:inherit}.sn-activity-card__title{display:flex;align-items:center;justify-content:space-between;gap:.3rem;min-width:0;font-size:1.05rem;font-weight:800;line-height:1.3}.sn-activity-card__check{display:grid;flex:none;width:1.15rem;height:1.15rem;place-items:center;border-radius:50%;background:var(--sn-action);color:#fff;font-size:.8rem;visibility:hidden}[aria-checked=true] .sn-activity-card__check{visibility:visible}.sn-activity-card__example{display:flex;align-items:center;gap:.18em;font-size:clamp(1.45rem,2.6cqi,2rem);font-weight:800;font-variant-numeric:tabular-nums;line-height:1.15;white-space:nowrap}.sn-activity-card__example em{display:inline-grid;flex:none;width:1.3em;height:1.3em;place-items:center;border-radius:50%;background:var(--sn-focus-soft);color:var(--sn-action-text);font-style:normal}.sn-activity-card__example .sn-fraction{font-size:.85em}.sn-activity-card__example--art{justify-content:flex-start}.sn-activity-card__example--art img{width:3.8rem;height:3.8rem;object-fit:contain}.sn-activity-card__description{color:var(--sn-text-muted);font-size:.875rem;line-height:1.4}.sn-choice-marker{position:absolute;z-index:0;top:0;left:0;display:none;border:1px solid var(--sn-border);border-radius:var(--sn-radius-md);background:var(--sn-surface-raised);box-shadow:var(--sn-shadow-card);pointer-events:none;transform-origin:top left;transition-property:none}[data-marker-ready] .sn-choice-marker{display:block}.sn-card-family{container-type:inline-size}.sn-card-links{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.75rem}.sn-card-links .sn-activity-card{border-color:var(--sn-border);background:var(--sn-surface-raised);box-shadow:var(--sn-shadow-card)}.sn-activity-card__chevron{width:1rem;height:1rem;flex:none;color:var(--sn-text-muted)}@container (max-width: 48rem){.sn-choice-grid,.sn-card-links{grid-template-columns:repeat(2,minmax(0,1fr))}.sn-activity-card{grid-template-columns:minmax(0,1fr) auto;grid-template-rows:auto auto;gap:.3rem .5rem;padding:.75rem}.sn-activity-card__title{font-size:1rem}.sn-activity-card__example{grid-column:2;grid-row:1 / 3;font-size:1.3rem}.sn-activity-card__description{grid-column:1}.sn-activity-card__example--art img{width:3rem;height:3rem}}@container (max-width: 34rem){.sn-choice-heading{font-size:1rem}.sn-choice-grid{gap:.25rem;padding:.25rem}.sn-choice-grid,.sn-card-links{grid-template-columns:repeat(2,minmax(0,1fr))}.sn-activity-card{grid-template-columns:minmax(0,1fr);grid-template-rows:auto 3rem;min-height:6.1rem;gap:.35rem;padding:.65rem}.sn-activity-card__title{grid-column:1 / -1;font-size:.9375rem}.sn-activity-card__title strong{min-width:0}.sn-activity-card__check{width:1rem;height:1rem;font-size:.7rem}.sn-activity-card__example{grid-column:1;grid-row:2;justify-content:center;font-size:clamp(1rem,5.8cqi,1.35rem)}[data-choice-kind=area] .sn-activity-card__description{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap}[data-choice-kind=mode]{grid-template-columns:2.5rem minmax(0,1fr);grid-template-rows:auto minmax(3rem,auto)}[data-choice-kind=mode] .sn-activity-card__example{grid-column:1;justify-content:flex-start}[data-choice-kind=mode] .sn-activity-card__example img{width:2.5rem;height:2.5rem}[data-choice-kind=mode] .sn-activity-card__description{grid-column:2;grid-row:2;align-self:center}}@media(max-width:359px){.sn-activity-card{padding:.55rem}.sn-activity-card__title{font-size:.875rem}[data-choice-kind=mode]{grid-template-columns:2rem minmax(0,1fr);gap:.35rem .25rem}[data-choice-kind=mode] .sn-activity-card__example img{width:2rem;height:2rem}}@media(prefers-reduced-motion:reduce){.sn-activity-card{transition:none}}.sn-choice-grid[data-choice-group=area]{grid-auto-rows:1fr;grid-template-columns:repeat(3,minmax(0,1fr))}.sn-activity-card__example .sn-column-vector{font-size:.9em}@container (max-width:48rem){.sn-choice-grid[data-choice-group=area]{grid-template-columns:repeat(2,minmax(0,1fr))}}@container (max-width:34rem){[data-choice-kind=mode] .sn-activity-card__description{font-size:1rem}[data-choice-kind=mode]{grid-template-rows:auto auto;min-height:8rem}}.sn-card-answer{display:inline-grid;align-items:center;justify-items:center;flex:none}.sn-card-question,.sn-card-solution{grid-area:1 / 1}.sn-card-solution{opacity:0;color:var(--sn-action-text)}[data-answer-solved] .sn-card-question{opacity:0}[data-answer-solved] .sn-card-solution{opacity:1}