:root{--color-bg:#fff;--color-surface:#f4f6f8;--color-text:#111;--color-text-muted:#333;--color-primary:#0047ab;--color-primary-hover:#003380;--color-border:#1a1a1a;--color-error:#8b0000;--color-success:#1e7e34;--font-family:system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-size-base:1.25rem;--font-size-lg:1.5rem;--font-size-xl:2rem;--font-size-2xl:2.5rem;--space-xs:.5rem;--space-sm:1rem;--space-md:1.5rem;--space-lg:2rem;--space-xl:3rem;--touch-min:3.25rem;--radius:.5rem;--focus-ring:0 0 0 4px #ffbf47}*,:before,:after{box-sizing:border-box}html{font-size:100%}body{min-height:100vh;font-family:var(--font-family);font-size:var(--font-size-base);color:var(--color-text);background:var(--color-bg);margin:0;line-height:1.6}#root{min-height:100vh}:focus-visible{outline:3px solid var(--color-border);outline-offset:3px;box-shadow:var(--focus-ring)}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}.app{flex-direction:column;min-height:100vh;display:flex}.app-root{min-height:100vh}.skip-link{left:var(--space-sm);z-index:100;padding:var(--space-sm) var(--space-md);background:var(--color-primary);color:#fff;font-size:var(--font-size-base);border-radius:var(--radius);font-weight:700;text-decoration:none;position:absolute;top:-100%}.skip-link:focus{top:var(--space-sm)}.app-header{padding:var(--space-md) var(--space-lg);background:var(--color-text);color:#fff;border-bottom:4px solid var(--color-primary)}.app-header__content{justify-content:space-between;align-items:center;gap:var(--space-md);flex-wrap:wrap;display:flex}.app-header__user{align-items:center;gap:var(--space-sm);flex-wrap:wrap;display:flex}.app-header__score{font-size:var(--font-size-lg);margin:0;font-weight:700}.btn--header{min-height:2.75rem;padding:var(--space-xs) var(--space-md);font-size:var(--font-size-base);color:#fff;background:0 0;border-color:#fff}.btn--header:hover{background:#ffffff1f}.app-header__brand{font-size:var(--font-size-2xl);letter-spacing:.02em;margin:0;font-weight:800}.app-header__tagline{margin:var(--space-xs) 0 0;font-size:var(--font-size-lg)}.app-main{width:min(48rem,100%);padding:var(--space-xl) var(--space-lg);flex:1;margin:0 auto}.app-main--wide{width:min(90rem,100%)}.app-footer{padding:var(--space-md) var(--space-lg);background:var(--color-surface);border-top:2px solid var(--color-border);text-align:center;font-size:var(--font-size-base)}.app-footer p{margin:0}.app-footer__dev{margin-top:var(--space-xs)}.app-footer__dev-link{color:var(--color-text-muted);cursor:pointer;background:0 0;border:none;padding:0;font-family:inherit;font-size:.95rem;font-weight:600;text-decoration:underline}.app-footer__dev-link:hover{color:var(--color-primary)}.btn{min-height:var(--touch-min);min-width:var(--touch-min);padding:var(--space-sm) var(--space-lg);font-family:inherit;font-size:var(--font-size-lg);text-align:center;cursor:pointer;border:3px solid var(--color-border);border-radius:var(--radius);color:var(--color-text);background:#fff;justify-content:center;align-items:center;font-weight:700;line-height:1.2;display:inline-flex}.btn--primary{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.btn--primary:hover{background:var(--color-primary-hover);border-color:var(--color-primary-hover)}.btn--secondary{margin-bottom:var(--space-md)}.btn--option{width:100%}.btn--option:hover{background:var(--color-surface)}.home__signed-in{align-items:center;gap:var(--space-md);flex-direction:column;display:flex}.home__greeting{font-size:var(--font-size-lg);margin:0;font-weight:700}.login-form{max-width:28rem;padding:var(--space-lg);text-align:left;background:var(--color-surface);border:3px solid var(--color-border);border-radius:var(--radius);margin:0 auto}.login-form h2{margin:0 0 var(--space-sm);font-size:var(--font-size-xl);text-align:center}.login-form__intro{margin:0 0 var(--space-md);font-size:var(--font-size-lg);color:var(--color-text-muted);text-align:center}.login-form__free{margin:0 0 var(--space-sm);font-size:var(--font-size-lg);text-align:center;font-weight:700}.login-form__google{min-height:3.5rem;margin-top:var(--space-md);flex-direction:column;justify-content:center;align-items:center;display:flex}.login-form__google.is-busy{pointer-events:none;opacity:.65}.login-form__google-button{justify-content:center;width:100%;min-height:2.75rem;display:flex}.login-form__loading{margin:0 0 var(--space-sm);font-size:var(--font-size-base);color:var(--color-text-muted)}.home{text-align:center}.home__lead{margin:0 auto var(--space-xl);max-width:36rem;font-size:var(--font-size-lg);color:var(--color-text-muted)}.home__catalog-link{margin:var(--space-xl) 0 0}.home__catalog-button{font-family:inherit;font-size:var(--font-size-base);color:var(--color-primary);cursor:pointer;background:0 0;border:none;padding:0;font-weight:600;text-decoration:underline}.home__catalog-button:hover{color:var(--color-primary-hover)}.exercises__header h1{margin:0 0 var(--space-sm);font-size:var(--font-size-xl)}.exercises__intro{margin:0 0 var(--space-lg);font-size:var(--font-size-lg);color:var(--color-text-muted)}.exercises__list{gap:var(--space-lg);flex-direction:column;display:flex}.status{font-size:var(--font-size-lg);padding:var(--space-md);background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius)}.status--error{color:var(--color-error);border-color:var(--color-error)}.status--ok{color:var(--color-success,#0b6b3a);border-color:var(--color-success,#0b6b3a)}.exercise-card{padding:var(--space-lg);background:var(--color-surface);border:3px solid var(--color-border);border-radius:var(--radius)}.exercise-card__meta{margin:0 0 var(--space-xs);font-size:var(--font-size-base);text-transform:uppercase;letter-spacing:.04em;font-weight:700}.exercise-card__prompt{margin:0 0 var(--space-md);font-size:var(--font-size-xl);line-height:1.3}.exercise-card__figure{margin:0 0 var(--space-md)}.exercise-card__image{border:3px solid var(--color-border);border-radius:var(--radius);max-width:100%;height:auto;display:block}.exercise-card__options{gap:var(--space-sm);flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.btn--option-correct{background:#e6f4ea;border-color:#1e7e34}.btn--option-incorrect{border-color:var(--color-error);background:#fdecea}.btn--option-muted{opacity:.65}.exercise-card__feedback{margin:var(--space-md) 0 0;padding:var(--space-sm) var(--space-md);font-size:var(--font-size-lg);border-radius:var(--radius);font-weight:700}.exercise-card__feedback--correct{background:#e6f4ea;border:2px solid #1e7e34}.exercise-card__feedback--incorrect{border:2px solid var(--color-error);background:#fdecea}.home__activities{width:100%;max-width:28rem;margin-top:var(--space-lg);text-align:left}.home__activities h2{margin:0 0 var(--space-sm);font-size:var(--font-size-xl);text-align:center}.home__activity-list{gap:var(--space-sm);flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.btn--activity{align-items:flex-start;gap:var(--space-xs);width:100%;padding:var(--space-md);text-align:left;background:var(--color-surface);flex-direction:column}.btn--activity:hover{background:#e8ecf0}.home__activity-name{font-size:var(--font-size-lg)}.home__activity-desc{font-size:var(--font-size-base);color:var(--color-text-muted);font-weight:400}.activity-shell{z-index:1000;background:var(--color-bg);padding:var(--space-xl);padding-top:calc(var(--space-xl) + var(--touch-min));-webkit-overflow-scrolling:touch;overscroll-behavior:contain;flex-direction:column;justify-content:safe center;align-items:center;display:flex;position:fixed;inset:0;overflow:hidden auto}.activity-shell__actions{top:var(--space-md);right:var(--space-md);z-index:1001;align-items:center;gap:var(--space-sm);display:flex;position:fixed}.activity-shell__exit{min-width:auto;padding-inline:var(--space-md);background:#fff}.letter-hunt{justify-content:center;align-items:center;gap:var(--space-lg);text-align:center;flex-direction:column;display:flex}.letter-hunt__setup{align-items:center;gap:var(--space-lg);flex-direction:column;width:100%;max-width:36rem;display:flex}.letter-hunt__setup-title{font-size:var(--font-size-2xl);color:var(--color-text);margin:0;font-weight:800}.letter-hunt__setup-lead{font-size:var(--font-size-lg);color:var(--color-text-muted);margin:0;font-weight:600}.letter-hunt__mode{min-inline-size:0;border:none;width:100%;margin:0;padding:0}.letter-hunt__setup .letter-hunt__mode,.letter-hunt__setup .letter-hunt__count,.letter-hunt__setup .letter-hunt__cases{min-inline-size:0;padding:var(--space-sm) var(--space-md) var(--space-md);border:2px solid var(--color-border);border-radius:var(--radius);margin:0;display:block}.letter-hunt__setup .letter-hunt__cases-legend,.letter-hunt__setup .letter-hunt__count-label{background:var(--color-bg);margin-inline:auto;padding-inline:.5rem}.letter-hunt__setup .letter-hunt__count-input{margin-inline:auto;display:block}.letter-hunt__mode-options--stacked{gap:var(--space-sm);flex-direction:row;width:100%;display:flex}.letter-hunt__mode-choice{min-width:0;min-height:4.5rem;padding:var(--space-sm) var(--space-md);text-align:left;cursor:pointer;color:var(--color-text);background:var(--color-surface);border:3px solid var(--color-border);border-radius:var(--radius);flex-direction:column;flex:1 1 0;align-items:flex-start;gap:.25rem;font-family:inherit;display:flex}.letter-hunt__mode-choice--active{border-color:var(--color-primary);box-shadow:inset 0 0 0 2px var(--color-primary)}.letter-hunt__mode-choice-title{font-size:var(--font-size-lg);font-weight:800}.letter-hunt__mode-choice-desc{font-size:var(--font-size-base);color:var(--color-text-muted);font-weight:500}.letter-hunt__count{flex-direction:column;align-items:center;gap:.35rem;width:100%;display:flex}.letter-hunt__count-label{font-size:var(--font-size-lg);color:var(--color-text);font-weight:800}.letter-hunt__count-input{width:6.5rem;min-height:3rem;padding:var(--space-xs) var(--space-sm);font-family:inherit;font-size:var(--font-size-xl);text-align:center;color:var(--color-text);background:var(--color-surface);border:3px solid var(--color-border);border-radius:var(--radius);font-weight:800}.letter-hunt__count-input:focus{border-color:var(--color-primary);outline:none}.letter-hunt__count-hint{font-size:var(--font-size-base);color:var(--color-text-muted);font-weight:500}.letter-hunt__cases{min-inline-size:0;border:none;flex-direction:column;align-items:center;gap:.5rem;width:100%;margin:0;padding:0;display:flex}.letter-hunt__cases-legend{font-size:var(--font-size-lg);color:var(--color-text);padding:0;font-weight:800}.letter-hunt__cases-options{justify-content:center;gap:var(--space-sm);flex-wrap:wrap;width:100%;display:flex}.letter-hunt__case-option{min-width:0;min-height:var(--touch-min);font-size:var(--font-size-base);color:var(--color-text);background:var(--color-surface);border:3px solid var(--color-border);border-radius:var(--radius);cursor:pointer;flex:7.5rem;justify-content:center;align-items:center;gap:.6rem;padding:.65rem 1rem;font-weight:700;display:flex}.letter-hunt__case-option:has(input:checked){border-color:var(--color-primary);box-shadow:inset 0 0 0 2px var(--color-primary)}.letter-hunt__case-option input{width:1.35rem;height:1.35rem;accent-color:var(--color-primary);cursor:pointer}.letter-hunt__case-sample{font-size:var(--font-size-xl);color:var(--color-text-muted);font-weight:800;line-height:1}.letter-hunt__start-btn{min-width:12rem;min-height:3.25rem;font-size:var(--font-size-lg)}.letter-hunt__progress{z-index:5;opacity:.55;pointer-events:none;background:#0000000f;border-radius:999px;flex-direction:column-reverse;width:5px;height:min(28vh,11rem);display:flex;position:fixed;top:50%;right:.6rem;overflow:hidden;transform:translateY(-50%)}.letter-hunt__progress-correct{background:var(--color-success);width:100%;min-height:0}.letter-hunt__progress-incorrect{background:var(--color-error);width:100%;min-height:0}.letter-hunt__progress-rest{background:0 0;width:100%;min-height:0}.letter-hunt__complete{align-items:center;gap:var(--space-lg);flex-direction:column;display:flex}.letter-hunt__complete--celebrate{animation:.55s ease-out letter-hunt-complete-pop}@keyframes letter-hunt-complete-pop{0%{opacity:0;transform:scale(.92)}60%{opacity:1;transform:scale(1.03)}to{opacity:1;transform:scale(1)}}.letter-hunt__complete-summary{justify-content:center;align-items:center;gap:var(--space-sm);font-size:var(--font-size-xl);flex-wrap:wrap;margin:0;font-weight:800;display:flex}.letter-hunt__complete-correct{color:var(--color-success)}.letter-hunt__complete-incorrect{color:var(--color-error)}.letter-hunt__complete-sep{color:var(--color-text-muted);font-weight:600}.letter-hunt__speak-btn{min-width:14rem;min-height:3.5rem;padding:var(--space-sm) var(--space-xl);font-family:inherit;font-size:var(--font-size-lg);cursor:pointer;color:var(--color-text);background:var(--color-surface);border:3px solid var(--color-border);border-radius:var(--radius);-webkit-user-select:none;user-select:none;font-weight:800}.letter-hunt__speak-btn--active{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.letter-hunt__letter{color:#000;margin:0;font-size:clamp(12rem,45vw,22rem);font-weight:800;line-height:1}.letter-hunt__status{font-size:var(--font-size-lg);color:var(--color-text-muted);margin:0;font-weight:700}.letter-hunt__status--listening{color:var(--color-primary)}.letter-hunt__status--hint{color:var(--color-text-muted);font-style:italic}.letter-hunt__status--error{color:var(--color-error);max-width:24rem}.letter-hunt__mic-btn{min-width:16rem}.letter-hunt__mic-issue{align-items:center;gap:var(--space-sm);flex-direction:column;display:flex}.letter-hunt__flash{z-index:1100;pointer-events:none;opacity:0;position:fixed;inset:0}.letter-hunt__flash--correct{background:var(--color-success);animation:.7s ease-out letter-hunt-flash}.letter-hunt__flash--incorrect{background:var(--color-error);animation:.7s ease-out letter-hunt-flash}@keyframes letter-hunt-flash{0%{opacity:.7}60%{opacity:.35}to{opacity:0}}.letter-hunt__banner{padding:var(--space-sm) var(--space-xl);font-size:var(--font-size-xl);color:#fff;border-radius:var(--radius);border:4px solid;margin:0;font-weight:800;animation:.25s ease-out letter-hunt-banner-pop}.letter-hunt__banner--correct{background:var(--color-success);border-color:var(--color-success)}.letter-hunt__banner--incorrect{background:var(--color-error);border-color:var(--color-error)}@keyframes letter-hunt-banner-pop{0%{opacity:0;transform:scale(.85)}to{opacity:1;transform:scale(1)}}.letter-hunt__streak{z-index:1200;pointer-events:none;place-items:center;animation:1.6s ease-out forwards letter-hunt-streak-fade;display:grid;position:fixed;inset:0}.letter-hunt__streak-burst{width:min(18rem,70vw);height:min(18rem,70vw);position:absolute}.letter-hunt__streak-particle{--streak-i:0;background:var(--color-success);width:.85rem;height:.85rem;transform:rotate(calc(var(--streak-i) * 30deg)) translateY(0) scale(.4);opacity:0;animation:1.2s ease-out forwards letter-hunt-streak-burst;animation-delay:calc(var(--streak-i) * 18ms);border-radius:.2rem;margin:-.425rem;position:absolute;top:50%;left:50%}.letter-hunt__streak-particle:nth-child(3n){background:var(--color-primary);border-radius:50%}.letter-hunt__streak-particle:nth-child(3n+1){background:#e6a817;width:.65rem;height:.65rem}.letter-hunt__streak-text{z-index:1;padding:var(--space-sm) var(--space-xl);letter-spacing:.02em;color:#fff;background:var(--color-success);border-radius:var(--radius);border:4px solid #145a28;margin:0;font-size:clamp(1.75rem,6vw,2.75rem);font-weight:800;animation:1.6s ease-out letter-hunt-streak-text;position:relative;box-shadow:0 10px 28px #0000002e}@keyframes letter-hunt-streak-burst{0%{opacity:0;transform:rotate(calc(var(--streak-i) * 30deg)) translateY(0) scale(.35)}20%{opacity:1}to{opacity:0;transform:rotate(calc(var(--streak-i) * 30deg)) translateY(-7.5rem) scale(1)}}@keyframes letter-hunt-streak-fade{0%,70%{opacity:1}to{opacity:0}}@keyframes letter-hunt-streak-text{0%{opacity:0;transform:scale(.7)}18%{opacity:1;transform:scale(1.08)}35%{transform:scale(1)}80%{opacity:1;transform:scale(1)}to{opacity:0;transform:scale(.96)}}.word-builder__setup-note{max-width:24rem;font-size:var(--font-size-base);color:var(--color-text-muted);margin:0;font-weight:500}.word-builder__tiles{justify-content:center;gap:var(--space-sm);flex-wrap:wrap;display:flex}.word-builder__tile{width:clamp(2.75rem,12vw,4rem);height:clamp(2.75rem,12vw,4rem);color:var(--color-text);background:var(--color-surface);border:3px dashed var(--color-border);border-radius:var(--radius);place-items:center;font-size:clamp(1.5rem,6vw,2.25rem);font-weight:800;display:grid}.word-builder__tile--filled{color:#fff;background:#000;border-style:solid;border-color:#000}.word-builder__prompt{font-size:var(--font-size-lg);color:var(--color-text-muted);margin:0;font-weight:700}.word-builder__letter--word{font-size:clamp(6rem,24vw,12rem)}.word-builder__letter--word-long{font-size:clamp(3.75rem,16vw,8rem)}.letter-hunt__debug-toggle{top:var(--space-md);left:var(--space-md);min-height:2.5rem;padding:var(--space-xs) var(--space-sm);font-family:inherit;font-size:var(--font-size-base);cursor:pointer;background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius);color:var(--color-text);font-weight:700;position:absolute}.letter-hunt__debug{right:var(--space-md);bottom:var(--space-md);width:min(22rem, calc(100vw - 2 * var(--space-md)));gap:var(--space-xs);max-height:min(55vh,28rem);padding:var(--space-sm) var(--space-md);color:#f5f5f5;border-radius:var(--radius);text-align:left;background:#111111f0;flex-direction:column;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.8rem;display:flex;position:fixed;left:auto;overflow-y:auto}.letter-hunt__debug-heard{padding:var(--space-xs) var(--space-sm);border-radius:var(--radius);background:#7fd0ff1f;border:1px solid #7fd0ff66;flex-direction:column;gap:.15rem;display:flex}.letter-hunt__debug-heard-label{text-transform:uppercase;letter-spacing:.04em;color:#9fd8ff;font-size:.7rem}.letter-hunt__debug-heard-value{color:#7fd0ff;word-break:break-word;font-size:1.05rem;font-weight:700}.letter-hunt__debug-row{align-items:center;gap:var(--space-sm);flex-wrap:wrap;font-size:.78rem;display:flex}.letter-hunt__debug-checkbox{align-items:center;gap:var(--space-xs);color:#d0d0d0;font-size:.78rem;display:flex}.letter-hunt__debug-log-toggle{cursor:pointer;color:#f5f5f5;border-radius:var(--radius);background:#ffffff1a;border:1px solid #ffffff40;min-height:1.75rem;padding:.2rem .6rem;font-family:inherit;font-size:.75rem;font-weight:700}.letter-hunt__debug-log{max-height:10rem;padding:var(--space-xs) 0 0 1.25rem;border-top:1px solid #ffffff26;margin:0;list-style:decimal;overflow-y:auto}.letter-hunt__debug-log li{margin-bottom:.15rem;line-height:1.4}.letter-hunt__debug-warning{padding:var(--space-xs) var(--space-sm);border-radius:var(--radius);color:#ffbf47;background:#ffbf4726;border:1px solid #ffbf47;margin:0;font-size:.78rem}.letter-hunt__debug-time{min-width:6.5rem;margin-right:var(--space-xs);color:#999;display:inline-block}.picture-match{gap:var(--space-md);width:min(100%,36rem);max-width:36rem;margin-inline:auto}.picture-match__frame{aspect-ratio:4/3;cursor:pointer;width:100%;font:inherit;color:inherit;background:var(--color-surface);border:3px solid var(--color-border);border-radius:var(--radius);padding:0;display:block;overflow:hidden}.picture-match__frame:hover{border-color:var(--color-primary)}.picture-match__frame:focus-visible{outline:3px solid var(--color-primary);outline-offset:3px}.picture-match__image{object-fit:cover;width:100%;height:100%;display:block}.picture-match__image--illustration{object-fit:contain;padding:var(--space-md);background:#fff}.picture-match__image-fallback{letter-spacing:.06em;place-items:center;width:100%;height:100%;margin:0;font-size:clamp(2.5rem,12vw,4rem);font-weight:800;display:grid}.picture-match__choices{gap:var(--space-sm);grid-template-columns:1fr 1fr;width:100%;display:grid}.picture-match__choice{min-height:var(--touch-min);padding:var(--space-sm) var(--space-md);letter-spacing:.08em;cursor:pointer;color:var(--color-text);background:var(--color-surface);border:3px solid var(--color-border);border-radius:var(--radius);font-family:inherit;font-size:clamp(2.1rem,9.5vw,3rem);font-weight:800}.picture-match__choice:hover:not(:disabled){border-color:var(--color-primary);background:#e8f0ff}.picture-match__choice:disabled{cursor:default}.picture-match__choice--correct{color:#fff;background:var(--color-success);border-color:var(--color-success)}@media (width<=28rem){.picture-match__choices{grid-template-columns:1fr}}.picture-catalog{gap:var(--space-lg);flex-direction:column;width:100%;max-width:72rem;margin:0 auto;display:flex}.picture-catalog__header{justify-content:space-between;align-items:flex-start;gap:var(--space-md);flex-wrap:wrap;display:flex}.picture-catalog__header h1{margin:0 0 var(--space-xs);font-size:var(--font-size-2xl);font-weight:800}.picture-catalog__lead{max-width:40rem;color:var(--color-text-muted);margin:0;font-weight:500}.picture-catalog__lead code{word-break:break-all;font-size:.95em}.picture-catalog__grid{gap:var(--space-md);grid-template-columns:repeat(auto-fill,minmax(14rem,1fr));margin:0;padding:0;list-style:none;display:grid}.picture-catalog__card{padding:var(--space-sm);background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius);flex-direction:column;gap:.35rem;display:flex}.picture-catalog__frame{aspect-ratio:4/3;border:2px solid var(--color-border);border-radius:var(--radius);background:#fff;overflow:hidden}.picture-catalog__image{object-fit:cover;width:100%;height:100%;display:block}.picture-catalog__frame--illustration{background:#fff}.picture-catalog__image--illustration{object-fit:contain;padding:var(--space-sm)}.picture-catalog__broken{height:100%;color:var(--color-error);place-items:center;margin:0;font-weight:700;display:grid}.picture-catalog__word{margin:var(--space-xs) 0 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