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var(--sf-border);box-shadow:var(--sf-shadow-lg);border-radius:20px;flex-direction:column;align-items:center;gap:18px;width:min(340px,92vw);padding:24px;display:flex}.path{flex-direction:column;flex:1;display:flex}.path-title{color:var(--sf-text-strong);font-size:16px;font-weight:800}.path-summary{background:var(--sf-surface-inset);border-radius:999px;align-self:flex-start;align-items:baseline;gap:4px;margin:4px 0;padding:8px 16px;display:flex}.path-summary-n{color:var(--sf-text-strong);font-size:18px;font-weight:900}.path-summary-total{color:var(--sf-text-body);font-size:14px;font-weight:700}.path-summary-lbl{color:var(--sf-text-muted);margin-left:2px;font-size:13px;font-weight:700}.path-band{border-top:1px solid var(--sf-border);flex-direction:column;gap:10px;padding:14px 4px 6px;display:flex}.path-band:first-of-type{border-top:none;padding-top:4px}.path-band-head{align-items:center;gap:8px;display:flex}.path-band-label{color:var(--sf-text-body);text-transform:uppercase;letter-spacing:.03em;font-size:13px;font-weight:800}.path-nodes{flex-wrap:wrap;align-content:flex-start;align-items:center;gap:14px;display:flex}.path-node{border:1px solid var(--sf-border);background:var(--sf-surface);width:52px;height:52px;color:var(--sf-text-muted);cursor:pointer;box-shadow:var(--sf-shadow-sm);border-radius:50%;justify-content:center;align-items:center;font-size:16px;font-weight:800;display:flex}.node-done{border-color:var(--sf-reward);background:var(--sf-reward);color:var(--sf-neutral-0);font-size:20px}.node-next{border:3px solid var(--sf-interactive);width:62px;height:62px;color:var(--sf-interactive);font-size:22px}.node-locked{border:1.5px dashed var(--sf-neutral-300);background:var(--sf-surface-inset);color:var(--sf-text-muted);cursor:default;box-shadow:none}.parent-panel{align-items:stretch;max-height:86vh;overflow-y:auto}.parent-row{justify-content:space-between;align-items:center;gap:12px;font-size:15px;display:flex}.parent-head{color:var(--sf-text-strong);font-size:17px;font-weight:800}.segmented{border:1px solid var(--sf-border);border-radius:10px;display:flex;overflow:hidden}.segmented button{background:var(--sf-surface);font:inherit;cursor:pointer;color:var(--sf-text-body);border:none;padding:8px 18px}.segmented .seg-on{background:var(--sf-text-strong);color:var(--sf-neutral-0)}.loading{color:var(--sf-text-muted);flex:1;justify-content:center;align-items:center;font-size:28px;display:flex}.parent-workbook-note{background:var(--sf-surface-inset);color:var(--sf-text-body);border-radius:12px;margin:4px 0 0;padding:12px;font-size:13px;line-height:1.45}.hub{gap:var(--sf-space-3);display:grid}.hub-bar{align-items:center;gap:var(--sf-space-3);padding:var(--sf-space-2) 0;grid-template-columns:auto 1fr auto auto;display:grid}.hub-wordmark{width:auto;height:46px;filter:drop-shadow(0 2px 3px color-mix(in srgb, var(--sf-neutral-0) 90%, transparent))}.hub-greeting{color:var(--sf-text-strong);font:var(--sf-type-h1);text-align:center;text-wrap:balance;margin:0}.hub-stats{align-items:center;gap:var(--sf-space-2);display:flex}.hub-stats>*{border:1px solid var(--sf-border);box-shadow:var(--sf-shadow-sm)}.hub-streak{align-items:center;gap:var(--sf-space-1);min-height:36px;padding:var(--sf-space-1) var(--sf-space-2);border-radius:var(--sf-radius-pill);background:var(--sf-retry-bg);color:var(--sf-retry);font:var(--sf-type-meta);display:inline-flex}.hub-streak strong{font-size:1.05rem;font-weight:var(--sf-weight-extrabold)}.hub-hero{align-items:end;gap:var(--sf-space-3);padding:var(--sf-space-2) 0 0;grid-template-columns:auto 1fr;display:grid;position:relative}.hub-scene{z-index:0;pointer-events:none;width:100%;height:100%;position:fixed;inset:0}.hub>:not(.hub-scene){z-index:1;position:relative}.hub-mascot-stage{padding:0 var(--sf-space-3);background:radial-gradient(66% 14% at 50% 96%,#c6ee86 0 42%,#0000 76%);align-self:end;display:block}.hub-mascot{width:auto;height:clamp(120px,26vw,300px);filter:drop-shadow(0 6px 10px color-mix(in srgb, var(--sf-text-strong) 22%, transparent));display:block}.hub-modes{gap:var(--sf-space-3);grid-template-columns:repeat(3,minmax(0,1fr));min-width:0;display:grid;position:relative}.hub-panels{gap:var(--sf-space-3);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.hub-continue{padding:var(--sf-space-3);border:1px solid var(--sf-border);border-radius:var(--sf-radius-lg);background:var(--sf-surface);box-shadow:var(--sf-shadow-sm)}.hub-panel-head{margin:0 0 var(--sf-space-2);color:var(--sf-text-body);font:var(--sf-type-label)}.hub-continue__body{gap:var(--sf-space-2);display:grid}.hub-continue__title{color:var(--sf-text-strong);font:var(--sf-type-h3);margin:0}.hub-daily__body{color:var(--sf-text-body);font:var(--sf-type-body);margin:0}@media (width<=700px){.hub-bar{row-gap:var(--sf-space-2);grid-template-columns:auto 1fr auto}.hub-greeting{font:var(--sf-type-h3)}.hub-stats{order:3;grid-column:1/-1}.hub-hero{padding-inline:var(--sf-space-2);grid-template-columns:1fr;align-items:center}.hub-modes{gap:var(--sf-space-2)}.hub-mascot-stage{justify-self:center}.hub-panels{grid-template-columns:1fr}}@media (width<=460px){.hub-wordmark{height:26px}.hub-mascot{height:104px}}.play-run .sf-activity__body{max-width:620px}@media (width<=520px){.ex-run .studio-bottom-action-bar__inner{gap:var(--sf-space-2);grid-template-columns:1fr 1fr;display:grid}.ex-run .studio-bottom-action-bar__inner>*{width:100%}.ex-run .ex-run-submit,.ex-run .play-check,.ex-run .play-retry,.ex-run .play-next{grid-column:1/-1}}[data-route-content] h1:focus,[data-route-content] h1:focus-visible{outline:none}.sf-activity,.sf-accent--sky{--activity-accent:var(--sf-interactive)}.sf-accent--meadow{--activity-accent:var(--sf-action)}.sf-accent--sunshine{--activity-accent:var(--sf-reward-glyph)}.sf-accent--coral{--activity-accent:var(--sf-life-glyph)}.sf-accent--lavender{--activity-accent:var(--sf-premium)}.sf-activity{gap:var(--sf-space-3);width:100%;display:grid}.sf-activity__bar{align-items:center;gap:var(--sf-space-3);grid-template-columns:auto auto 1fr;display:grid}.sf-activity__brand{width:auto;height:30px}.sf-activity__back .studio-button,.sf-activity__back .sf-button{border-radius:50%;width:56px;min-width:56px;height:56px;font-size:1.5rem}.sf-activity__status{justify-content:center;align-items:center;gap:var(--sf-space-3);min-height:56px;padding:var(--sf-space-2) var(--sf-space-4);border:1px solid var(--sf-border);border-radius:var(--sf-radius-pill);background:var(--sf-surface);box-shadow:var(--sf-shadow-sm);flex-wrap:wrap;display:flex}.sf-activity__title{color:var(--sf-text-strong);font:var(--sf-type-h3);margin:0}.sf-activity__position{color:var(--sf-text-body);font:var(--sf-type-label);white-space:nowrap}.sf-activity__stage{align-items:stretch;gap:var(--sf-space-3);grid-template-columns:minmax(0,1fr) minmax(200px,300px);display:grid}.sf-activity__panel{align-content:center;justify-items:stretch;gap:var(--sf-space-3);padding:var(--sf-space-4);border:1px solid var(--sf-border);border-radius:var(--sf-radius-xl);background:var(--sf-surface-warm);box-shadow:var(--sf-shadow-sm);display:grid}.sf-activity__panel .ex-card{box-shadow:none;background:0 0;border:none;border-radius:0;padding:0}.sf-activity__panel .ex-body{align-items:stretch;width:100%}.sf-activity__chip{padding:var(--sf-space-1) var(--sf-space-3);border-radius:var(--sf-radius-pill);background:var(--sf-premium-bg);color:var(--sf-premium-ink);font:var(--sf-type-label);justify-self:center;margin:0}.sf-activity__coach{align-items:center;gap:var(--sf-space-2);flex-direction:column;order:2;display:flex}.sf-speech{padding:var(--sf-space-3) var(--sf-space-4);border:1px solid var(--sf-border);border-radius:var(--sf-radius-xl) var(--sf-radius-xl) var(--sf-radius-sm);background:var(--sf-surface);box-shadow:var(--sf-shadow-sm);color:var(--sf-text-strong);font:var(--sf-type-body-lg);font-weight:var(--sf-weight-extrabold);text-align:center;margin:0;position:relative}.sf-rule-card{gap:var(--sf-space-2);padding:var(--sf-space-4);border:2px solid var(--sf-reward-border);border-radius:var(--sf-radius-lg);background:var(--sf-reward-bg);color:var(--sf-text-strong);font:var(--sf-type-body);text-align:center;margin:auto 0 0;display:grid}.sf-rule-card__glyph{color:var(--sf-reward-glyph);font-size:25px;line-height:1}.sf-activity__coach-stage{padding:0 var(--sf-space-4);background:radial-gradient(62% 16% at 50% 96%,#c6ee86 0 40%,#0000 74%);display:block}.sf-activity__coach-art{width:auto;height:clamp(140px,24vw,320px);filter:drop-shadow(0 6px 10px color-mix(in srgb, var(--sf-text-strong) 20%, transparent));display:block}.sf-activity__actions{align-items:center;gap:var(--sf-space-3);grid-template-columns:auto minmax(260px,1fr) auto;display:grid}.sf-activity__secondary{gap:var(--sf-space-2);flex-wrap:wrap;display:flex}.sf-activity__reward{min-height:44px;padding:var(--sf-space-2) var(--sf-space-3);border:1px solid var(--sf-border);background:var(--sf-surface);font:var(--sf-type-label);justify-self:end}.sf-activity__primary{justify-self:stretch}.sf-activity__primary .sf-button{width:100%;min-height:56px;font-size:1.2rem}@media (width<=760px){.sf-activity__bar{grid-template-columns:auto 1fr}.sf-activity__back .studio-button,.sf-activity__back .sf-button{border-radius:50%;width:56px;min-width:56px;height:56px;font-size:1.5rem}.sf-activity__status{border-radius:var(--sf-radius-lg);grid-column:1/-1;justify-content:flex-start}.sf-activity__stage{grid-template-columns:1fr}.sf-activity__coach{order:0;grid-template-columns:auto minmax(0,1fr);place-items:end stretch}.sf-activity__coach .sf-speech{text-align:left;order:2}.sf-rule-card{order:3;grid-column:1/-1}.sf-activity__coach-stage{background:0 0;padding:0}.sf-activity__coach-art{object-fit:cover;object-position:50% 6%;order:1;width:104px;height:116px}.sf-activity__actions{grid-template-columns:1fr auto}.sf-activity__reward{grid-area:1/2}.sf-activity__primary{grid-area:2/1/auto/-1}}.sf-button{justify-content:center;align-items:center;gap:var(--sf-space-2);min-height:var(--sf-tap-min);min-width:var(--sf-tap-min);padding:0 var(--sf-space-5);border-radius:var(--sf-radius-md);color:var(--sf-text-strong);font:var(--sf-type-label);cursor:pointer;transition:transform var(--sf-duration-fast) var(--sf-ease), box-shadow var(--sf-duration-fast) var(--sf-ease);border:2px solid #0000;display:inline-flex}.sf-button:hover:not(:disabled){transform:translateY(-2px)}.sf-button:active:not(:disabled){box-shadow:none;transform:translateY(1px)}.sf-button:disabled{cursor:not-allowed;opacity:.5;transform:none}.sf-button--primary{border-color:var(--sf-action-pressed);background:linear-gradient(var(--sf-action-soft), var(--sf-action-hover));color:var(--sf-text-on-fill);box-shadow:inset 0 2px 0 color-mix(in srgb, var(--sf-text-on-fill) 34%, transparent), 0 4px 0 var(--sf-action-pressed)}.sf-button--secondary{border-color:var(--sf-interactive);background:var(--sf-surface);box-shadow:0 3px 0 color-mix(in srgb, var(--sf-interactive) 15%, transparent)}.sf-button--ghost{color:var(--sf-interactive-hover);background:0 0}.sf-button--destructive{border-color:var(--sf-error-ink);background:var(--sf-error);color:var(--sf-text-on-fill);box-shadow:0 4px 0 var(--sf-error-ink)}.sf-button--icon{width:var(--sf-tap-min);padding:0;font-size:1.4rem}.sf-button--compact{min-height:40px;padding-inline:var(--sf-space-4);font:var(--sf-type-meta);font-weight:var(--sf-weight-bold)}.sf-button__spinner{border:2px solid color-mix(in srgb, currentcolor 25%, transparent);border-top-color:currentColor;border-radius:50%;flex:none;width:16px;height:16px;animation:.7s linear infinite sf-spin}.sf-answer{align-items:center;gap:var(--sf-space-3);min-height:62px;padding:var(--sf-space-3);border:2px solid var(--sf-border);border-radius:var(--sf-radius-lg);background:var(--sf-surface);box-shadow:var(--sf-shadow-sm);color:var(--sf-text-strong);font:var(--sf-type-label);text-align:left;cursor:pointer;transition:border-color var(--sf-duration-fast) var(--sf-ease), background var(--sf-duration-fast) var(--sf-ease), transform var(--sf-duration-fast) var(--sf-ease);display:flex;position:relative}.sf-answer:hover:not(:disabled){border-color:var(--activity-accent,var(--sf-interactive));transform:translateY(-1px)}.sf-answer__shortcut{border-radius:var(--sf-radius-sm);background:var(--sf-surface-inset);width:30px;height:30px;color:var(--sf-text-body);font:var(--sf-type-meta);font-weight:var(--sf-weight-extrabold);flex:0 0 30px;place-items:center;display:grid}.sf-answer__state{width:28px;height:28px;color:var(--sf-text-on-fill);font-weight:var(--sf-weight-extrabold);border-radius:50%;place-items:center;margin-left:auto;display:grid}.sf-answer--selected{border-color:var(--sf-interactive);background:linear-gradient(145deg, var(--sf-surface), var(--sf-interactive-bg));box-shadow:0 3px 0 color-mix(in srgb, var(--sf-interactive) 22%, transparent)}.sf-answer--selected .sf-answer__shortcut{background:var(--sf-interactive);color:var(--sf-text-on-fill)}.sf-answer--correct{border-color:var(--sf-correct);background:var(--sf-correct-bg)}.sf-answer--correct .sf-answer__state{background:var(--sf-correct)}.sf-answer--retry{border-color:var(--sf-retry);background:var(--sf-retry-bg)}.sf-answer--retry .sf-answer__state{background:var(--sf-retry)}.sf-answer:disabled,.sf-answer--disabled{cursor:not-allowed;opacity:.48;transform:none}.sf-visual-answer{place-items:center;gap:var(--sf-space-2);min-height:145px;padding:var(--sf-space-3);border:2px solid var(--sf-border);border-radius:var(--sf-radius-lg);background:var(--sf-surface-warm);box-shadow:var(--sf-shadow-sm);color:var(--sf-text-strong);font:var(--sf-type-label);cursor:pointer;transition:border-color var(--sf-duration-fast) var(--sf-ease), transform var(--sf-duration-fast) var(--sf-ease);display:grid;position:relative}.sf-visual-answer:hover:not(:disabled){border-color:var(--activity-accent,var(--sf-interactive));transform:translateY(-2px)}.sf-visual-answer__art{place-items:center;min-height:86px;display:grid}.sf-visual-answer__check{top:var(--sf-space-2);right:var(--sf-space-2);border:2px solid var(--sf-surface);background:var(--sf-interactive);width:28px;height:28px;box-shadow:var(--sf-shadow-sm);color:var(--sf-text-on-fill);border-radius:50%;place-items:center;display:grid;position:absolute}.sf-visual-answer.sf-answer--selected{border-color:var(--sf-interactive);background:linear-gradient(145deg, var(--sf-surface), var(--sf-interactive-bg))}.sf-visual-answer.sf-answer--correct .sf-visual-answer__check{background:var(--sf-correct)}.sf-visual-answer.sf-answer--retry .sf-visual-answer__check{background:var(--sf-retry)}.sf-segments{min-width:170px;color:var(--sf-text-strong);font:var(--sf-type-meta);font-weight:var(--sf-weight-extrabold)}.sf-segments__track{margin-top:var(--sf-space-1);gap:3px;display:flex}.sf-segments__track span{border:1px solid var(--sf-border-recessed);background:var(--sf-surface-recessed);border-radius:6px;flex:1;min-width:18px;height:18px}.sf-segments__track span.is-complete{border-color:var(--sf-action-pressed);background:linear-gradient(var(--sf-action-soft), var(--sf-action-hover))}.sf-segments__track span.is-current{border-color:var(--sf-interactive);background:var(--sf-interactive-bg)}.sf-progress__meta{margin-bottom:var(--sf-space-2);color:var(--sf-text-body);font:var(--sf-type-meta);justify-content:space-between;display:flex}.sf-progress__meta strong{color:var(--sf-text-strong)}.sf-progress__track{border:1px solid var(--sf-border-recessed);border-radius:var(--sf-radius-pill);background:var(--sf-surface-recessed);height:10px;overflow:hidden}.sf-progress__track span{border-radius:inherit;background:var(--activity-accent,var(--sf-interactive));height:100%;transition:width var(--sf-duration-base) var(--sf-ease);display:block}.sf-progress--quiz .sf-progress__track span{background:var(--sf-action)}.sf-progress--game .sf-progress__track span{background:var(--sf-reward-glyph)}.sf-reward,.sf-lives,.sf-timer{align-items:center;gap:var(--sf-space-1);min-height:36px;padding:var(--sf-space-1) var(--sf-space-2);border-radius:var(--sf-radius-pill);font:var(--sf-type-meta);font-weight:var(--sf-weight-extrabold);display:inline-flex}.sf-reward{background:var(--sf-reward-bg);color:var(--sf-reward)}.sf-reward__icon{color:var(--sf-reward-glyph);font-size:1.05rem}.sf-timer{background:var(--sf-interactive-bg);color:var(--sf-interactive-hover)}.sf-lives{background:var(--sf-retry-bg);color:var(--sf-text-disabled);letter-spacing:2px}.sf-lives__heart--full{color:var(--sf-life-glyph)}.sf-feedback{align-items:flex-start;gap:var(--sf-space-3);min-height:88px;padding:var(--sf-space-4);border-radius:var(--sf-radius-lg);border:1px solid #0000;display:flex}.sf-feedback__icon{width:34px;height:34px;color:var(--sf-text-on-fill);font-weight:var(--sf-weight-extrabold);border-radius:50%;flex:0 0 34px;place-items:center;display:grid}.sf-feedback__title{color:var(--sf-text-strong);font:var(--sf-type-label)}.sf-feedback__body{margin:var(--sf-space-1) 0 0;color:var(--sf-text-body);font:var(--sf-type-body)}.sf-feedback--correct{border-color:var(--sf-correct-border);background:var(--sf-correct-bg)}.sf-feedback--correct .sf-feedback__icon{background:var(--sf-correct)}.sf-feedback--retry{border-color:var(--sf-retry-border);background:var(--sf-retry-bg)}.sf-feedback--retry .sf-feedback__icon{background:var(--sf-retry)}.sf-feedback--hint{border-color:var(--sf-reward-border);background:var(--sf-reward-bg)}.sf-feedback--hint .sf-feedback__icon{background:var(--sf-reward-glyph);color:var(--sf-text-strong)}.sf-feedback--tutor{border-color:var(--sf-border-strong);background:var(--sf-interactive-bg)}.sf-feedback--tutor .sf-feedback__icon{border-radius:var(--sf-radius-lg);background:var(--sf-surface);flex-basis:52px;width:52px;height:52px}.sf-mode-card{aspect-ratio:1/1.05;border:4px solid var(--sf-surface);border-radius:var(--sf-radius-xl);min-height:150px;box-shadow:0 6px 0 color-mix(in srgb, var(--sf-text-strong) 12%, transparent), 0 10px 20px color-mix(in srgb, var(--sf-text-strong) 12%, transparent);color:var(--sf-text-on-fill);text-align:center;cursor:pointer;transition:transform var(--sf-duration-fast) var(--sf-ease);flex-direction:column;justify-content:flex-end;text-decoration:none;display:flex;position:relative;overflow:hidden}.sf-mode-card:hover:not([aria-disabled=true]){transform:translateY(-3px)}.sf-mode-card__art{height:76%;display:block;position:absolute;inset:0 0 auto}.sf-mode-card__art img{object-fit:cover;object-position:center center;width:100%;height:100%}.sf-mode-card__label{padding:var(--sf-space-2) var(--sf-space-2) var(--sf-space-3);background:var(--mode-bar);display:block;position:relative}.sf-mode-card--learn{--mode-bar:var(--sf-mode-learn)}.sf-mode-card--play{--mode-bar:var(--sf-mode-play)}.sf-mode-card--quiz{--mode-bar:var(--sf-mode-quiz)}.sf-mode-card__title{font-size:clamp(1.1rem,3.4vw,1.5rem);font-weight:var(--sf-weight-extrabold);text-shadow:0 2px 0 color-mix(in srgb, var(--sf-text-strong) 32%, transparent);line-height:1.15;display:block}.sf-mode-card__subtitle{font:var(--sf-type-meta);font-weight:var(--sf-weight-bold);margin-top:2px;display:block}.sf-mode-card[aria-disabled=true]{cursor:not-allowed}.sf-mode-card[aria-disabled=true] .sf-mode-card__art img{filter:saturate(.72)}.sf-mode-card__lock{top:var(--sf-space-2);right:var(--sf-space-2);z-index:1;min-height:26px;padding:0 var(--sf-space-2);border-radius:var(--sf-radius-pill);background:var(--sf-surface);box-shadow:var(--sf-shadow-sm);color:var(--sf-text-body);font:var(--sf-type-meta);font-weight:var(--sf-weight-extrabold);align-items:center;display:inline-flex;position:absolute}@media (width<=700px){.sf-mode-card{aspect-ratio:1/1.2;border-width:3px;min-height:0}.sf-mode-card__label{padding:var(--sf-space-1) var(--sf-space-1) var(--sf-space-2)}.sf-mode-card__title{font-size:clamp(.9rem,3.8vw,1.15rem)}.sf-mode-card__subtitle{display:none}.sf-mode-card__lock{min-height:22px;padding:0 var(--sf-space-1);font-size:.7rem}}.sf-level-path{justify-content:space-between;align-items:center;gap:var(--sf-space-2);padding:var(--sf-space-4) var(--sf-space-3);display:flex;position:relative;overflow-x:auto}.sf-level-path:before{content:"";border-top:3px dotted var(--sf-action-soft);position:absolute;top:50%;left:28px;right:28px}.sf-level-path__node{border:3px solid var(--sf-surface);background:var(--sf-surface-recessed);width:42px;height:42px;box-shadow:0 0 0 1px var(--sf-border);color:var(--sf-text-muted);font:var(--sf-type-meta);font-weight:var(--sf-weight-extrabold);border-radius:50%;flex:none;place-items:center;display:grid;position:relative}.sf-level-path__node--done{background:var(--sf-action);color:var(--sf-text-on-fill)}.sf-level-path__node--current{background:var(--sf-reward-glyph);box-shadow:0 0 0 4px var(--sf-reward-bg);color:var(--sf-text-strong)}@media (width<=700px){.sf-level-path{padding-inline:var(--sf-space-1)}.sf-level-path__node{border-width:2px;width:34px;height:34px}}.sf-daily{padding:var(--sf-space-3);border:1px solid var(--sf-border);border-radius:var(--sf-radius-lg);background:var(--sf-surface-warm);box-shadow:var(--sf-shadow-sm)}.sf-daily__head{align-items:center;gap:var(--sf-space-2);margin-bottom:var(--sf-space-2);color:var(--sf-text-strong);font:var(--sf-type-label);display:flex}.sf-daily__head .sf-reward{margin-left:auto}.sf-bottom-nav{border:1px solid var(--sf-border);border-radius:var(--sf-radius-lg);background:var(--sf-surface-warm);min-height:60px;box-shadow:var(--sf-shadow-sm);grid-template-columns:repeat(4,1fr);display:grid;overflow:hidden}.sf-bottom-nav__item{text-align:center;overflow-wrap:anywhere;min-width:0;padding-inline:2px;padding:var(--sf-space-2) 0;color:var(--sf-text-strong);font:var(--sf-type-meta);font-weight:var(--sf-weight-extrabold);cursor:pointer;background:0 0;border:0;align-content:center;place-items:center;gap:2px;text-decoration:none;display:grid;position:relative}.sf-bottom-nav__item span{color:var(--sf-interactive);font-size:1.25rem;line-height:1}.sf-bottom-nav__item[aria-current=page]:before{content:"";background:var(--sf-interactive);border-radius:0 0 4px 4px;width:70%;height:3px;position:absolute;top:0}.sf-bottom-nav__item[aria-disabled=true]{color:var(--sf-text-muted);cursor:not-allowed;opacity:.65}.sf-bottom-nav__item[aria-disabled=true] span{color:var(--sf-text-disabled)}.sf-pattern{justify-content:center;align-items:center;gap:clamp(var(--sf-space-2), 2vw, var(--sf-space-5));min-height:108px;padding:var(--sf-space-4);border:1px solid var(--sf-border);border-radius:var(--sf-radius-lg);background:var(--sf-surface-warm);box-shadow:inset 0 2px 8px color-mix(in srgb, var(--sf-text-strong) 5%, transparent);display:flex}.sf-pattern__missing{border:2px dashed var(--sf-border-recessed);border-radius:var(--sf-radius-md);background:var(--sf-surface-recessed);width:58px;height:58px;color:var(--sf-text-muted);font-size:1.75rem;font-weight:var(--sf-weight-extrabold);place-items:center;display:grid}.sf-answer:focus-visible,.sf-button:focus-visible,.sf-visual-answer:focus-visible,.sf-mode-card:focus-visible{outline:3px solid var(--sf-focus);outline-offset:3px}@keyframes sf-spin{to{transform:rotate(360deg)}}@media (prefers-reduced-motion:reduce){.sf-answer,.sf-button,.sf-visual-answer,.sf-mode-card,.sf-progress__track span{transition:none}.sf-answer:hover:not(:disabled),.sf-button:hover:not(:disabled),.sf-visual-answer:hover:not(:disabled){justify-content:flex-end}.sf-mode-card:has(.sf-mode-card__art){justify-content:flex-end}.sf-mode-card:hover:not([aria-disabled=true]){transform:none}.sf-button__spinner{animation-duration:2.4s}}.sf-sr-only{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.studio-button{min-width:var(--sf-tap-min);text-align:center}.studio-button--icon{width:var(--sf-tap-min);padding:var(--sf-space-1)}.studio-button__label--loading{opacity:.85}.studio-button__spinner{border:2px solid;border-right-color:#0000;border-radius:50%;flex:none;width:18px;height:18px;animation:.8s linear infinite studio-spin}.studio-card{padding:var(--sf-space-4);border:1px solid var(--sf-border);border-radius:var(--sf-radius-lg);background:var(--sf-surface);box-shadow:var(--sf-shadow-sm)}.studio-section{gap:var(--sf-space-3);display:grid}.studio-section__header,.studio-page-header,.studio-offering-card__main,.studio-dialog__header{justify-content:space-between;align-items:flex-start;gap:var(--sf-space-3);display:flex}.studio-section__title,.studio-page-header__title,.studio-dialog__title,.studio-offering-card__title{color:var(--sf-text-strong);font-family:var(--sf-font);font-weight:var(--sf-weight-extrabold);margin:0;line-height:1.2}.studio-section__title{font:var(--sf-type-h3)}.studio-section__description,.studio-page-header__description,.studio-offering-card__description,.studio-offering-card__locked-copy{margin:var(--sf-space-1) 0 0;color:var(--sf-text-body);font:var(--sf-type-body)}.studio-section__action,.studio-page-header__actions{flex:none}.studio-page-header{align-items:center}.studio-page-header__leading{align-items:flex-start;gap:var(--sf-space-3);display:flex}.studio-page-header__eyebrow{margin:0 0 var(--sf-space-1);color:var(--sf-interactive);font:var(--sf-type-meta);font-weight:var(--sf-weight-extrabold);letter-spacing:.08em;text-transform:uppercase}.studio-page-header__title{font-size:clamp(1.5rem,4vw,2rem)}.studio-notice{align-items:flex-start;gap:var(--sf-space-2);padding:var(--sf-space-3);border:1px solid var(--studio-notice-border);border-radius:var(--sf-radius-lg);background:var(--studio-notice-bg);color:var(--studio-notice-ink);font:var(--sf-type-body);display:flex}.studio-notice--info{--studio-notice-bg:var(--sf-interactive-bg);--studio-notice-border:var(--sf-interactive-border);--studio-notice-ink:var(--sf-text-strong)}.studio-notice--success{--studio-notice-bg:var(--sf-correct-bg);--studio-notice-border:var(--sf-action-soft);--studio-notice-ink:var(--sf-correct)}.studio-notice--warning{--studio-notice-bg:var(--sf-reward-bg);--studio-notice-border:var(--sf-reward-border);--studio-notice-ink:var(--sf-reward)}.studio-notice--error{--studio-notice-bg:var(--sf-error-bg);--studio-notice-border:var(--sf-error);--studio-notice-ink:var(--sf-error-ink)}.studio-notice__icon{width:24px;height:24px;font-weight:var(--sf-weight-extrabold);border:2px solid;border-radius:50%;flex:none;justify-content:center;align-items:center;display:inline-flex}.studio-notice__title{color:inherit;display:block}.studio-notice__body{color:inherit}.studio-dialog-backdrop{z-index:50;padding:var(--sf-space-5);background:color-mix(in srgb, var(--sf-text-strong) 38%, transparent);place-items:center;display:grid;position:fixed;inset:0}.studio-dialog{width:min(100%,460px);max-height:min(720px,100dvh - 40px);padding:var(--sf-space-4);border:1px solid var(--sf-border);border-radius:var(--sf-radius-xl);background:var(--sf-surface);box-shadow:var(--sf-shadow-lg);overflow:auto}.studio-dialog__title{font:var(--sf-type-h2)}.studio-dialog__body{margin-top:var(--sf-space-3);color:var(--sf-text-body);font:var(--sf-type-body)}.studio-dialog__actions{justify-content:flex-end;gap:var(--sf-space-2);margin-top:var(--sf-space-5);flex-wrap:wrap;display:flex}.studio-bottom-action-bar{z-index:10;margin:0 calc(-1 * var(--sf-space-4));padding:var(--sf-space-3) var(--sf-space-4) calc(var(--sf-space-3) + env(safe-area-inset-bottom));border-top:1px solid var(--sf-border);background:color-mix(in srgb, var(--sf-canvas) 92%, transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);position:sticky;bottom:0}.studio-bottom-action-bar__inner{justify-content:flex-end;gap:var(--sf-space-2);flex-wrap:wrap;max-width:760px;margin:0 auto;display:flex}.studio-offering-card{gap:var(--sf-space-4);padding:var(--sf-space-4);border:1px solid var(--sf-border);border-radius:var(--sf-radius-lg);background:var(--sf-surface);box-shadow:var(--sf-shadow-sm);grid-template-columns:minmax(0,1fr) auto;align-items:center;display:grid}.studio-offering-card--interactive{width:100%;color:inherit;font:inherit;text-align:left;cursor:pointer;transition:transform var(--sf-duration-fast) var(--sf-ease), box-shadow var(--sf-duration-fast) var(--sf-ease);text-decoration:none}.studio-offering-card--interactive:hover{box-shadow:var(--sf-shadow-md);transform:translateY(-2px)}.studio-offering-card--interactive:focus-visible{outline:3px solid var(--sf-focus);outline-offset:3px}.studio-offering-card--disabled,.studio-offering-card--disabled:hover{background:var(--sf-surface-muted);box-shadow:none;cursor:not-allowed;opacity:.78;border-style:dashed;transform:none}.studio-offering-card--disabled .studio-offering-card__action{color:var(--sf-text-muted)}.studio-offering-card__action{align-items:center;gap:var(--sf-space-1);min-height:var(--sf-tap-min);padding:var(--sf-space-1) 2px;color:var(--sf-interactive);font:var(--sf-type-label);display:inline-flex}.studio-offering-card__action:after{content:"→"}.studio-offering-card--premium .studio-offering-card__action{color:var(--sf-premium-ink)}.studio-offering-card--premium{border-color:var(--sf-premium-border);background:linear-gradient(135deg, var(--sf-surface), var(--sf-premium-bg))}.studio-offering-card__main{justify-content:flex-start}.studio-offering-card__icon{border-radius:var(--sf-radius-lg);background:var(--sf-surface-muted);width:52px;height:52px;color:var(--sf-text-strong);flex:none;justify-content:center;align-items:center;display:inline-flex}.studio-offering-card--catalog .studio-offering-card__icon{border-radius:var(--sf-radius-xl);width:76px;height:76px}.studio-offering-card--catalog{grid-template-columns:1fr}.studio-offering-card--catalog .studio-offering-card__action{justify-self:end}.studio-offering-card--catalog .studio-offering-card__title{text-wrap:balance}.studio-offering-card--track-comparison .studio-offering-card__icon{background:var(--track-comparison)}.studio-offering-card--track-ordering .studio-offering-card__icon{background:var(--track-ordering)}.studio-offering-card--track-patterns .studio-offering-card__icon{background:var(--track-patterns)}.studio-offering-card--track-logic-puzzles .studio-offering-card__icon{background:var(--track-logic-puzzles)}.studio-offering-card--track-scales .studio-offering-card__icon{background:var(--track-scales)}.studio-offering-card--track-counting .studio-offering-card__icon{background:var(--track-counting)}.studio-offering-card--track-arithmetic .studio-offering-card__icon{background:var(--track-arithmetic)}.studio-offering-card--track-shapes-space .studio-offering-card__icon{background:var(--track-shapes-space)}.studio-offering-card__badge{min-height:24px;padding:2px var(--sf-space-2);border-radius:var(--sf-radius-pill);background:var(--sf-surface-muted);color:var(--sf-text-strong);font:var(--sf-type-meta);font-weight:var(--sf-weight-extrabold);align-items:center;display:inline-flex}.studio-offering-card--premium .studio-offering-card__badge{background:var(--sf-premium);color:var(--sf-text-on-fill)}.studio-offering-card__title{margin-top:var(--sf-space-1);font:var(--sf-type-h3)}.studio-offering-card__locked-copy{color:var(--sf-premium-ink);font-weight:var(--sf-weight-extrabold)}@keyframes studio-spin{to{transform:rotate(360deg)}}@media (width<=520px){.studio-page-header,.studio-offering-card{flex-direction:column;grid-template-columns:1fr;align-items:stretch}.studio-page-header__actions>*,.studio-offering-card__action,.studio-bottom-action-bar__inner>*{width:100%}.studio-section__header{flex-direction:column}}@media (prefers-reduced-motion:reduce){.studio-offering-card--interactive,.studio-button__spinner{transition:none;animation:none}}.am{flex-direction:column;align-items:center;gap:16px;display:flex}.am-equation{flex-wrap:wrap;justify-content:center;align-items:center;gap:10px;display:flex}.am-group{border:2px solid var(--sf-border);background:var(--sf-surface-inset);border-radius:12px;flex-wrap:wrap;justify-content:center;gap:2px;max-width:140px;padding:6px 8px;display:flex}.am-item{font-size:1.3rem;line-height:1}.am-op{color:var(--sf-text-strong);font-size:1.5rem;font-weight:800}.am-number{text-align:center;min-width:34px;color:var(--sf-text-strong);font-size:1.5rem;font-weight:800}.am-blank{border:2px dashed var(--sf-interactive);width:44px;height:44px;color:var(--sf-interactive);border-radius:12px;justify-content:center;align-items:center;font-size:1.4rem;font-weight:800;display:inline-flex}.bm-scales{flex-wrap:wrap;justify-content:center;align-items:flex-end;gap:20px;margin-bottom:16px;display:flex}.bm-scale{flex-direction:column;align-items:center;display:flex}.bm-beam{border-bottom:4px solid var(--sf-text-strong);align-items:flex-end;gap:10px;padding:0 6px 6px;display:flex}.bm-stand{border-left:12px solid #0000;border-right:12px solid #0000;border-bottom:18px solid var(--sf-text-strong);width:0;height:0}.bm-plate{border:2px solid var(--sf-border);background:var(--sf-surface-inset);border-radius:10px;flex-wrap:wrap;justify-content:center;align-items:center;gap:2px;min-width:64px;max-width:130px;min-height:40px;padding:6px;display:flex}.bm-item{font-size:1.3rem;line-height:1}.bm-question{color:var(--sf-interactive);font-size:1.6rem;font-weight:800}.cp-number{text-align:center;min-width:40px;color:var(--sf-text-strong);font-size:1.6rem;font-weight:800}.cm{flex-direction:column;align-items:center;gap:16px;display:flex}.cm-row{flex-wrap:wrap;justify-content:center;gap:6px;max-width:140px;display:flex}.cm-item{font-size:1.4rem;line-height:1}.cm-number{color:var(--sf-text-strong);font-size:1.5rem;font-weight:700}.cc{flex-direction:column;align-items:center;gap:16px;display:flex}.cc-figure{justify-content:center;padding:4px 0;display:flex}.cc-figure svg{max-width:min(100%,300px);height:auto}.cc-number{font-size:1.4rem;font-weight:800;line-height:1}.dt{flex-direction:column;align-items:center;gap:16px;display:flex}.dt-clues{justify-content:center;gap:10px;display:flex}.dt-clue{border:2px solid var(--sf-border);background:var(--sf-surface-inset);border-radius:999px;align-items:center;gap:6px;padding:6px 12px;font-size:1.2rem;line-height:1;display:inline-flex}.dt-mark{font-weight:800}.dt-yes .dt-mark{color:var(--sf-correct)}.dt-no .dt-mark{color:var(--sf-retry)}.dt-suspect{flex-direction:column;align-items:center;gap:4px;display:flex}.dt-animal{font-size:1.7rem;line-height:1}.dt-badges{gap:3px;min-height:18px;font-size:.95rem;line-height:1;display:flex}.dt-option{align-items:flex-start}.vm{flex-direction:column;align-items:center;gap:18px;display:flex}.vm-figure{justify-content:center;display:flex}.vm-option{align-items:center;padding:12px 16px}.vm-grid{flex-direction:column;padding:2px;display:flex}.vm-row{display:flex}.vm-row+.vm-row{margin-top:-1.5px}.vm-cell{width:var(--vm-cell,24px);height:var(--vm-cell,24px);border:1.5px solid color-mix(in srgb, var(--sf-text-strong) 50%, transparent);box-sizing:border-box}.vm-cell+.vm-cell{margin-left:-1.5px}.vm-cell.vm-empty{background:0 0;border-color:#0000}.hl{flex-direction:column;align-items:center;gap:4px;display:flex}.hl-seesaw{align-items:center;gap:6px;transition:transform .3s;display:flex}.hl-left{transform:rotate(-8deg)}.hl-right{transform:rotate(8deg)}.hl-beam{background:var(--sf-text-strong);border-radius:3px;width:150px;height:6px}.hl-pan{border:2px solid var(--sf-border);background:var(--sf-surface-inset);border-radius:12px;justify-content:center;align-items:center;min-width:52px;min-height:52px;font-size:1.8rem;line-height:1;display:inline-flex}.hl-stand{border-left:16px solid #0000;border-right:16px solid #0000;border-bottom:26px solid var(--sf-text-strong);width:0;height:0;margin-bottom:12px}.hl-option{font-size:1.6rem}.me{flex-direction:column;align-items:center;gap:16px;display:flex}.me-groups{grid-template-columns:repeat(3,minmax(0,1fr));grid-auto-rows:1fr;gap:14px 16px;width:100%;max-width:480px;display:grid}.me-group{flex-direction:column;align-items:center;gap:8px;display:flex}.me-items{border:2px solid var(--sf-border);background:var(--sf-surface-inset);border-radius:12px;flex-wrap:wrap;flex:1;place-content:center;gap:2px;width:100%;min-height:40px;padding:8px;display:flex}.me-item{font-size:1.25rem;line-height:1}.me-mark{border:2px solid var(--sf-text-body);background:var(--sf-surface);width:34px;height:34px;font:inherit;color:var(--sf-interactive);cursor:pointer;border-radius:50%;font-weight:800}.me-mark:not(:disabled):hover,.me-marked{border-color:var(--sf-interactive)}.me-right{border-color:var(--sf-correct);color:var(--sf-correct)}.me-wrong{border-color:var(--sf-retry);color:var(--sf-retry)}.me-ghost{opacity:.45}.on{flex-direction:column;align-items:center;gap:16px;display:flex}.on-slots,.on-chips{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.on-slot{border:2px dashed var(--sf-border);width:46px;height:46px;color:var(--sf-text-strong);background:var(--sf-surface-inset);border-radius:12px;justify-content:center;align-items:center;font-family:inherit;font-size:1.2rem;font-weight:800;display:inline-flex}button.on-slot{cursor:default}button.on-slot.on-filled:not(:disabled){cursor:pointer}.on-filled{border-style:solid;border-color:var(--sf-interactive);background:var(--sf-surface)}.on-right{border-color:var(--sf-correct);background:var(--sf-correct-bg)}.on-wrong{border-color:var(--sf-retry);background:var(--sf-retry-bg)}.on-key{align-items:center}.on-key-mark{color:var(--sf-correct);font-weight:800}.on-chip{border:2px solid var(--sf-border);background:var(--sf-surface);width:46px;height:46px;font:inherit;color:var(--sf-text-strong);cursor:pointer;border-radius:12px;font-size:1.2rem;font-weight:800}.on-chip:not(:disabled):hover{border-color:var(--sf-interactive)}.on-used{opacity:.35;cursor:default}.om{flex-direction:column;align-items:center;gap:16px;display:flex}.om-container{flex-direction:column;align-items:center;gap:8px;display:flex}.om-row{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.om-tile{border:2px solid var(--sf-border);background:var(--sf-surface-inset);border-radius:12px;justify-content:center;align-items:center;width:48px;height:48px;font-size:1.5rem;line-height:1;display:inline-flex}.om-arrow{color:var(--sf-interactive);font-size:1.5rem;font-weight:800;line-height:1}.mae-board{flex-direction:column;align-items:center;gap:16px;margin:0 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.studio-offering-card__icon{border-radius:24px;width:84px;height:84px}.track-detail__unit-grid{gap:var(--sf-space-4);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.track-detail__unit-card{grid-template-columns:1fr;align-content:space-between;min-width:0}.track-detail__unit-card .studio-offering-card__action{justify-self:end}.track-detail__description,.track-detail__counts,.track-detail__unavailable-copy{display:block}.track-detail__counts{gap:var(--sf-space-2);margin-top:var(--sf-space-3);color:var(--sf-text-body);flex-wrap:wrap;font-size:.88rem;font-weight:800;display:flex}.track-detail__counts>span{border-radius:var(--sf-radius-pill);background:var(--sf-surface-inset);padding:4px 9px}.track-detail__unavailable-copy{margin-top:var(--sf-space-2);color:var(--sf-text-muted);font-size:.88rem;font-weight:700}@media (width<=560px){.track-detail__unit-grid{grid-template-columns:1fr}}.play-hub__blurb,.play-hub__unavailable{display:block}.play-hub__meta{margin-top:var(--sf-space-3);border-radius:var(--sf-radius-pill);background:var(--sf-surface-inset);color:var(--sf-text-body);padding:4px 9px;font-size:.88rem;font-weight:800;display:inline-block}.play-hub__unavailable{margin-top:var(--sf-space-2);color:var(--sf-text-muted);font-size:.88rem;font-weight:700}