:root{--bg:#FFFCF6;--surface:#FFFFFF;--ink:#241B43;--muted:#6E6690;--line:#EEE8FB;--brand:#6D28D9;--brand-700:#5B21B6;--brand-50:#F1ECFF;--brand-100:#E7DDFF;--coral:#FB6F92;--coral-50:#FFE9EF;--sunny:#FBBF24;--sunny-50:#FFF4D6;--sky:#38BDF8;--sky-50:#E3F5FF;--green:#22C55E;--green-50:#DCFCE7;--sky-btn:#0578B0;--sky-btn-sh:#045d86;--green-btn:#15803D;--green-btn-sh:#0f5f2d;--coral-btn:#D6346A;--coral-btn-sh:#a52850;--green-ink:#15803D;--coral-ink:#C81E5A;--r:24px;--r-sm:16px;--shadow:0 22px 48px -20px rgba(76,29,149,.35);--shadow-sm:0 10px 24px -12px rgba(76,29,149,.3);--pad:clamp(28px,5.5vw,80px);--maxw:1240px}:root[data-theme=dark]{--bg:#161126;--surface:#1E1735;--ink:#F4EFFF;--muted:#B9AEDC;--line:#2E2550;--brand:#B197FC;--brand-700:#9B7DF7;--brand-50:#241B45;--brand-100:#2D2350;--coral:#FB6F92;--coral-50:#3A2030;--sunny:#FBBF24;--sunny-50:#3A2E12;--sky:#38BDF8;--sky-50:#10293A;--green:#34D399;--green-50:#10362A;--green-ink:#34D399;--coral-ink:#FB6F92;--shadow:0 22px 50px -18px rgba(0,0,0,.6);--shadow-sm:0 10px 24px -12px rgba(0,0,0,.55)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Nunito,Trebuchet MS,system-ui,sans-serif;font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}h1,h2,h3,.disp{font-family:Fredoka,Trebuchet MS,system-ui,sans-serif;line-height:1.02;letter-spacing:-.015em;margin:0}p{margin:0}a{color:inherit;text-decoration:none}.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}section{padding:88px 0}.center{text-align:center}.eyebrow{display:inline-flex;align-items:center;gap:.45rem;font-family:Fredoka,sans-serif;font-weight:600;font-size:14px;color:var(--brand);background:var(--brand-50);padding:.4rem .85rem;border-radius:999px}.lead{font-size:19px;color:var(--muted);max-width:58ch}h2.big{font-size:clamp(30px,4.4vw,50px);font-weight:700}.btn{display:inline-flex;align-items:center;gap:.5rem;font-family:Fredoka,sans-serif;font-weight:600;border-radius:999px;padding:.9rem 1.6rem;font-size:18px;cursor:pointer;border:0;white-space:nowrap;transition:transform .15s ease,box-shadow .2s,background .2s}.btn-primary{background:var(--brand);color:#fff;box-shadow:0 10px 0 -2px var(--brand-700)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 0 -2px var(--brand-700)}.btn-primary:active{transform:translateY(3px);box-shadow:0 6px 0 -2px var(--brand-700)}.btn-ghost{background:var(--surface);color:var(--brand);border:2px solid var(--brand-100)}.btn-ghost:hover{border-color:var(--brand);transform:translateY(-2px)}.btn-lg{padding:1.05rem 1.9rem;font-size:20px}header.nav{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(10px) saturate(160%);border-bottom:1px solid var(--line)}.nav-row{display:flex;align-items:center;justify-content:space-between;height:80px}.nav-right .btn-primary{box-shadow:0 5px 0 -1px var(--brand-700)}.nav-right .btn-primary:hover{box-shadow:0 7px 0 -1px var(--brand-700);transform:translateY(-1px)}.nav-right .btn-primary:active{box-shadow:0 3px 0 -1px var(--brand-700);transform:translateY(2px)}.brand{display:flex;align-items:center;gap:.55rem;font-family:Fredoka,sans-serif;font-weight:700;font-size:23px}.brand .mark{width:40px;height:40px;border-radius:13px;background:var(--brand-50);display:grid;place-items:center}.nav-links{display:flex;gap:1.7rem;font-weight:700;color:var(--muted);font-size:16px}.nav-links a:hover{color:var(--ink)}.nav-links a.active{color:var(--brand);font-weight:800;text-decoration:underline;text-decoration-thickness:3px;text-underline-offset:8px}.nav-right{display:flex;align-items:center;gap:12px}.theme-toggle{cursor:pointer;background:var(--surface);border:2px solid var(--line);border-radius:999px;width:42px;height:42px;font-size:18px;line-height:1;display:grid;place-items:center;padding:0}.theme-toggle:hover{border-color:var(--brand)}.lang{position:relative}.lang>summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:.45rem;font-family:Fredoka,sans-serif;font-weight:600;font-size:15px;color:var(--ink);background:var(--surface);border:2px solid var(--line);border-radius:999px;padding:.5rem .9rem}.lang>summary::-webkit-details-marker{display:none}.lang>summary:after{content:"▾";color:var(--muted);font-size:12px;margin-left:.1rem}.lang[open]>summary{border-color:var(--brand);color:var(--brand)}.lang-menu{position:absolute;right:0;top:calc(100% + 8px);width:min(520px,calc(100vw - 24px));max-height:min(70vh,560px);overflow-y:auto;overscroll-behavior:contain;background:var(--surface);border:1px solid 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.35em;margin-left:.15em}.gc-pad{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.key{font-family:Fredoka,sans-serif;font-weight:600;font-size:22px;color:#fff;background:var(--sky-btn);border-radius:14px;padding:14px 0;text-align:center;box-shadow:0 5px 0 -1px var(--sky-btn-sh)}.float{position:absolute;filter:drop-shadow(var(--shadow-sm));z-index:3}.float.fox{width:150px;left:-26px;bottom:-18px;z-index:4;animation:bob 5s ease-in-out infinite}.float.f1{width:84px;left:-10px;top:-6px;animation:bob 6.5s ease-in-out .3s infinite}.float.f2{width:78px;right:-22px;top:30%;animation:bob 5.5s ease-in-out .5s infinite}.float.f3{width:78px;right:6px;bottom:-14px;animation:bob 6.2s ease-in-out .2s infinite}.float.f4{width:70px;left:34%;top:-30px;animation:bob 6.8s ease-in-out .4s infinite}@keyframes mpAfterimage{0%{transform:translate(-50%,-50%) scale(1) rotate(var(--rot,0deg));opacity:.34}to{transform:translate(calc(-50% + var(--dx,0px)),calc(-50% + var(--dy,0px))) scale(.74) 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.sample{position:absolute;right:34px;top:54px;background:#fff;color:var(--ink);border-radius:16px;padding:9px 15px;font-family:Fredoka,sans-serif;font-weight:700;font-size:25px;box-shadow:var(--shadow-sm);rotate:7deg;z-index:1;animation:bob 6s ease-in-out .4s infinite}.tile.big .sample b{color:var(--coral)}.tile.big .sample .g{color:var(--green)}.tile.big .bub{position:absolute;z-index:1;background:#ffffff2e;color:#fff;font-family:Fredoka,sans-serif;font-weight:700;font-size:18px;padding:.3rem .7rem;border-radius:999px}.tile.big .bub.b1{left:30px;top:108px;rotate:-6deg;animation:bob 6.5s ease-in-out .2s infinite}.tile.big .bub.b2{left:150px;top:188px;rotate:5deg;animation:bob 7s ease-in-out .5s infinite}.tile.big .tstar{position:absolute;z-index:1;color:var(--sunny);font-size:22px;animation:tw 3.5s ease-in-out infinite}@media(max-width:880px){.bento{grid-template-columns:1fr 1fr;grid-auto-rows:148px}.tile.big,.tile.w3,.tile.w2{grid-column:span 2;grid-row:span 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.ck{color:var(--green);font-weight:800}@media(max-width:880px){.twoup{grid-template-columns:1fr}}.cta-band{position:relative;overflow:hidden;background:linear-gradient(135deg,#7c3aed,#c026d3 60%,#fb6f92);color:#fff;border-radius:34px;padding:60px 28px;text-align:center;box-shadow:var(--shadow)}.cta-band h2{font-size:clamp(32px,4.6vw,52px);font-weight:700}.cta-band p{margin:14px auto 0;max-width:46ch;color:#ffffffeb;font-size:19px}.cta-band .btn-primary{background:#fff;color:var(--brand);box-shadow:0 10px 0 -2px #0000002e}.cta-band .row{margin-top:26px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}.cta-band .btn-primary{animation:pulse 2.4s ease-in-out infinite}@keyframes pulse{0%,to{transform:translateY(0) scale(1)}50%{transform:translateY(-2px) scale(1.04)}}.cta-band .cpet{position:absolute;width:120px;bottom:-12px}.cta-band .cpet.l{left:4%;animation:peekL 3.4s ease-in-out infinite}.cta-band .cpet.r{right:4%;animation:peekR 3.4s ease-in-out .6s infinite}@keyframes 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1rem;font-family:Fredoka,sans-serif;font-weight:600;font-size:15px;cursor:pointer}.hud{display:flex;gap:8px;align-items:center}.hud .chip{background:var(--brand-50);color:var(--brand);border-radius:999px;padding:.25rem .7rem;font-size:14px;font-weight:700}.progressbar{height:10px;border-radius:999px;background:var(--line);overflow:hidden;margin-bottom:18px}.progressbar>span{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--coral));transition:width .3s ease}.timerbar{height:8px;border-radius:999px;background:var(--line);overflow:hidden;margin-bottom:18px}.timerbar>span{display:block;height:100%;background:var(--green);transition:width .2s linear}.timerbar.low>span{background:var(--coral)}.play-companion{position:absolute;right:18px;top:112px;width:66px;z-index:1;filter:drop-shadow(var(--shadow-sm));pointer-events:none;animation:bob 5.5s ease-in-out infinite}.play-companion.cheer{animation:petBounce .62s cubic-bezier(.2,1.35,.4,1)}@keyframes 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button{width:44px;height:44px;border-radius:12px;border:0;background:var(--brand);color:#fff;font-size:22px;cursor:pointer}.arr-grid{display:grid;gap:5px;justify-content:center;margin:8px auto 0}.arr-grid i{width:26px;height:26px;border-radius:6px;background:var(--green);display:block}.arr-eq{text-align:center;font-family:Fredoka,sans-serif;font-weight:700;font-size:28px;margin-top:14px;color:var(--brand)}.tri{text-align:center;font-family:Fredoka,sans-serif;font-weight:700;color:var(--ink);margin:6px 0 16px}.tri .top{font-size:36px;color:var(--coral)}.tri .bot{font-size:26px;letter-spacing:8px}.lesson-preview{margin:4px auto 16px}.lesson-preview.skip{display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.lesson-preview.skip span{min-width:44px;height:44px;border-radius:14px;background:var(--sky-btn);color:#fff;display:grid;place-items:center;font-family:Fredoka,sans-serif;font-weight:700;font-size:20px;box-shadow:0 4px 0 -1px var(--sky-btn-sh)}.lesson-preview.area{display:grid;grid-template-columns:repeat(4,18px);gap:4px;justify-content:center}.lesson-preview.area i{width:18px;height:18px;border-radius:5px;background:var(--green);display:block}.lesson-preview.family{width:116px;text-align:center;font-family:Fredoka,sans-serif;font-weight:700;color:var(--ink);position:relative;padding-top:2px}.lesson-preview.family:before{content:"";position:absolute;left:10px;right:10px;top:12px;height:78px;background:var(--sunny-50);clip-path:polygon(50% 0,100% 100%,0 100%);z-index:0}.lesson-preview.family .top,.lesson-preview.family .bot{position:relative;z-index:1}.lesson-preview.family .top{font-size:31px;color:var(--coral);margin-bottom:10px}.lesson-preview.family .bot{display:flex;justify-content:space-around;font-size:23px;color:var(--brand)}.lesson-preview.small{float:right;margin:0 0 8px 12px;transform:scale(.82);transform-origin:top right}.lesson-preview.skip.small{gap:4px}.lesson-preview.skip.small 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.15s}.finger.bent{height:22px;background:var(--coral-btn)}.finger.tens{background:var(--brand)}.finger.ones{background:var(--green-btn,var(--green))}.lhub{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:30px}.lcard{display:block;text-decoration:none;color:inherit;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--shadow-sm);transition:transform .15s;cursor:pointer;text-align:left;width:100%}.lcard:hover{transform:translateY(-4px)}.lcard .ico{font-size:34px}.lcard h3{font-family:Fredoka,sans-serif;font-weight:600;font-size:20px;margin:8px 0 4px}.lcard p{color:var(--muted);font-size:15px}@media(max-width:560px){.lhub{grid-template-columns:1fr}}@media(max-width:430px){.lesson-actions{flex-direction:column}.lesson-actions .btn{justify-content:center}.lesson-listen-row{grid-template-columns:1fr}.listen-btn{margin:0 auto 8px;order:-1}.lesson-preview.small{float:none;margin:0 auto 10px;transform:none}}:root{--band-learn:#ede9fe;--band-learn-ink:#5b21b6;--band-fam:#bbf7d0;--band-fam-ink:#166534;--band-mast:#15803d;--band-mast-ink:#fff}[data-theme=dark]{--band-learn:#3b2f6b;--band-learn-ink:#ddd6fe;--band-fam:#14532d;--band-fam-ink:#bbf7d0;--band-mast:#15803d;--band-mast-ink:#fff}.prog-wrap{max-width:680px;margin:0 auto;padding:24px var(--pad) 64px}.prog-top{display:flex;align-items:center;justify-content:center;gap:14px;margin:18px 0 8px}.prog-pet{width:84px;height:92px;transition:transform .3s ease}.prog-pet.stage-0{transform:scale(.66)}.prog-pet.stage-1{transform:scale(.78)}.prog-pet.stage-2{transform:scale(.9)}.prog-pet.stage-3{transform:scale(1)}.prog-pet.stage-4{transform:scale(1.12)}.prog-count{font-family:Fredoka,sans-serif;font-weight:700;color:var(--ink);font-size:30px;display:flex;align-items:center;gap:8px}.prog-count .star{color:#f5b53d;font-size:25px}.prog-count .of{font-size:18px;color:var(--muted);font-weight:600}.prog-legend{display:flex;align-items:center;justify-content:center;gap:8px;color:var(--muted);font-size:14px;margin-bottom:14px}.prog-legend .sw{width:18px;height:18px;border-radius:5px;display:inline-block}.prog-grid{position:relative;display:grid;grid-template-columns:repeat(var(--cols),1fr);gap:5px;max-width:520px;margin:0 auto;aspect-ratio:1}.prog-grid:after{content:"";position:absolute;inset:0;pointer-events:none;z-index:0;background:linear-gradient(to bottom right,transparent calc(50% - .75px),var(--brand-100) 50%,transparent calc(50% + .75px));opacity:.5}.gcell{position:relative;z-index:1;aspect-ratio:1;border-radius:7px;border:1px solid transparent;cursor:pointer;padding:0;display:grid;place-items:center;font-family:Fredoka,sans-serif;font-weight:700;font-size:13px;transition:transform .12s ease,box-shadow .12s ease}.gcell .prod{opacity:0}.gcell.active{z-index:3;transform:scale(1.14);box-shadow:0 0 0 3px var(--brand)}.gcell.active .prod{opacity:1}.b-unseen{background:var(--surface);border:1.5px dashed var(--line)}.b-learning{background:var(--band-learn);color:var(--band-learn-ink)}.b-familiar{background:var(--band-fam);color:var(--band-fam-ink)}.b-mastered{background:var(--band-mast);color:var(--band-mast-ink)}.b-learning:after{content:"";position:absolute;bottom:3px;left:50%;transform:translate(-50%);width:5px;height:5px;border-radius:50%;background:var(--brand)}.b-familiar:after{content:"";position:absolute;bottom:3px;left:50%;transform:translate(-50%);width:8px;height:8px;border-radius:50%;background:#16a34a}.b-mastered:after{content:"★";position:absolute;top:0;right:3px;font-size:9px;color:#ffffffeb}.prog-actions{display:flex;gap:12px;justify-content:center;margin-top:26px}@media(prefers-reduced-motion:reduce){.gcell,.prog-pet{transition:none}.gcell.active{transform:none}}@media(max-width:480px){.prog-grid{gap:3px}.gcell{border-radius:5px;font-size:11px}.prog-actions{flex-direction:column}.prog-actions .btn{justify-content:center}}.quiz-wrap{max-width:560px;margin:0 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i{transition:none}}.match-wrap{max-width:650px;min-height:680px;margin:0 auto;padding:24px var(--pad) 72px;text-align:center}.match-intro h1{font-family:Fredoka,sans-serif;font-size:clamp(32px,6vw,46px);line-height:1;letter-spacing:-.03em;margin:8px 0 10px;color:var(--ink);text-wrap:balance}.match-intro p{max-width:34rem;margin:0 auto;color:var(--muted);font-size:17px;line-height:1.45;text-wrap:balance}.match-example{display:inline-flex;align-items:center;gap:10px;margin-top:14px;padding:7px 12px;border-radius:12px;background:var(--brand-50);color:var(--ink);font-family:Fredoka,sans-serif;font-size:17px;font-weight:700}.match-example span:last-child{color:var(--brand)}.match-example b{color:var(--muted)}.match-head{max-width:520px;margin:14px auto 8px}.match-pips{display:flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:var(--surface);border:1.5px solid var(--line)}.match-pips i{width:12px;height:12px;border-radius:50%;border:2px solid var(--brand-100);background:transparent}.match-pips i.on{border-color:var(--green);background:var(--green)}.match-pet-shell{width:54px;height:60px;display:grid;place-items:center;transition:transform .3s ease}.match-pet-shell.stage-0{transform:scale(.7)}.match-pet-shell.stage-1{transform:scale(.82)}.match-pet-shell.stage-2{transform:scale(.92)}.match-pet-shell.stage-3{transform:scale(1)}.match-pet-shell.stage-4{transform:scale(1.12)}.match-pet-shell .quiz-pet{width:54px;height:60px}.match-board{display:grid;grid-template-columns:minmax(0,1fr) 30px minmax(0,1fr);gap:12px;align-items:center;max-width:520px;margin:12px auto 0}.match-column{min-width:0}.match-column-key{display:flex;align-items:center;justify-content:center;gap:8px;min-height:36px;margin-bottom:9px;color:var(--muted);font-family:Fredoka,sans-serif;font-size:16px;font-weight:700}.match-column-key b{width:26px;height:26px;display:grid;place-items:center;border-radius:50%;background:var(--brand-50);color:var(--brand)}.match-list{display:grid;gap:10px}.match-flow{color:var(--brand-100);font-size:28px;font-weight:800;transform:translateY(20px)}.match-choice{min-height:68px;width:100%;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 14px;border:2px solid var(--line);border-radius:16px;background:var(--surface);color:var(--ink);font-family:Fredoka,sans-serif;font-size:clamp(20px,4vw,26px);font-weight:700;box-shadow:0 4px 0 -1px var(--line);cursor:pointer;transition:transform .14s ease,opacity .14s ease}.match-choice i{width:30px;height:30px;display:grid;place-items:center;border-radius:9px;background:var(--brand-50);color:var(--brand);font-size:16px;font-style:normal}.match-choice.fact{border-left:5px solid var(--brand)}.match-choice.answer{border-right:5px solid var(--brand-100)}.match-choice:hover:not(:disabled):not([aria-disabled=true]){transform:translateY(-2px)}.match-choice:active:not(:disabled):not([aria-disabled=true]){transform:translateY(2px)}.match-choice:focus-visible{outline:3px solid var(--coral);outline-offset:3px}.match-choice.selected{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-50),0 4px 0 -1px var(--brand)}.match-choice:disabled{cursor:not-allowed;opacity:.48}.match-choice.matched{border-color:var(--green);background:var(--band-fam);color:var(--band-fam-ink);box-shadow:0 4px 0 -1px var(--green);cursor:default;opacity:1;animation:pop .3s ease}.match-choice.matched i{background:var(--green);color:#fff}.match-choice.wrong{border-style:dashed;border-color:#c58b16;box-shadow:0 0 0 4px #c58b1621}.match-choice.wrong i{background:#fff3c4;color:#76520b}.match-status{min-height:34px;margin:18px 0 0;color:var(--ink);font-family:Fredoka,sans-serif;font-size:22px;font-weight:700;font-variant-numeric:tabular-nums}.match-done{padding-top:28px}.match-seal{width:112px;height:112px;display:grid;place-items:center;margin:0 auto 18px;border-radius:38% 62% 58% 42%;background:var(--band-fam);color:var(--band-fam-ink);box-shadow:inset 0 0 0 3px var(--green),0 10px 0 -4px #16a34a33;font-family:Fredoka,sans-serif;font-size:58px;font-weight:700;animation:pop .35s ease}.match-complete{margin:0;font-family:Fredoka,sans-serif;font-size:32px;font-weight:700;color:var(--ink)}@keyframes pop{0%{transform:scale(1)}50%{transform:scale(1.12)}to{transform:scale(1)}}@keyframes petbump{0%,to{transform:scale(1)}45%{transform:scale(1.2)}}.quiz-pet.bump{animation:petbump .42s ease}@media(max-width:430px){.match-wrap{min-height:620px;padding-left:16px;padding-right:16px}.match-board{grid-template-columns:minmax(0,1fr) 18px minmax(0,1fr);gap:6px}.match-flow{font-size:20px}.match-choice{min-height:62px;padding:8px 9px;border-radius:13px;font-size:18px}.match-choice i{width:25px;height:25px;font-size:14px}.match-column-key{font-size:14px}.match-head{margin-top:10px}}@media(prefers-reduced-motion:reduce){.match-pet-shell,.match-choice{transition:none}.match-choice.matched,.match-seal,.quiz-pet.bump{animation:none}}.arr-game-wrap{--agcell:clamp(20px,4.5vw,28px);--agcell-gap:4px;max-width:560px;margin:0 auto;padding:18px var(--pad) 56px;text-align:center}.arr-game-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;min-height:56px}.arr-game-count{font-family:Fredoka,sans-serif;font-weight:700;font-size:22px;color:var(--ink);display:flex;align-items:center;gap:6px}.arr-grid-outer{display:flex;justify-content:center}.arr-grid-wrap{position:relative;display:inline-block}.arr-game-grid{display:grid;gap:var(--agcell-gap)}.agcell{width:var(--agcell);height:var(--agcell);border-radius:5px;background:var(--line);border:1.5px dashed var(--brand-100);transition:background .18s ease,border-color .18s ease}.agcell.ag-filled,.agcell.ag-left{background:var(--brand);border-color:transparent}.agcell.ag-right{background:var(--coral);border-color:transparent}.agcell.ag-done{background:var(--green);border-color:transparent}.agcell.ag-new{animation:ag-wave-in .22s ease backwards;animation-delay:calc(var(--ci,0) * 18ms)}@keyframes ag-wave-in{0%{transform:scale(0) rotate(-6deg);opacity:0}to{transform:scale(1) rotate(0);opacity:1}}.arr-split-line{position:absolute;top:-4px;bottom:-4px;width:3px;background:var(--ink);opacity:.75;border-radius:2px;pointer-events:none;transform:translate(-50%);animation:split-pulse .45s ease}@keyframes split-pulse{0%{width:3px}40%{width:7px;opacity:1}to{width:3px}}.arr-btn-zone{min-height:86px;display:flex;flex-direction:column;align-items:center;justify-content:center}.arr-btn-placeholder{height:62px}.arr-add-btn{display:block;margin:0 auto 2px;width:62px;height:62px;border-radius:50%;background:var(--brand);color:#fff;font-size:32px;font-weight:700;border:0;cursor:pointer;line-height:1;box-shadow:0 7px 0 -1px var(--brand-700);font-family:Fredoka,sans-serif;transition:transform .12s,box-shadow .12s}.arr-add-btn:active{transform:translateY(4px);box-shadow:0 2px 0 -1px var(--brand-700)}.arr-add-btn:disabled{opacity:.25;cursor:default;transform:none;box-shadow:none}.arr-add-btn.tapped{animation:btn-spring .18s ease}@keyframes btn-spring{0%{transform:scale(1)}40%{transform:scale(1.18)}to{transform:scale(1)}}.arr-row-hint{font-family:Fredoka,sans-serif;font-size:14px;color:var(--muted);margin-top:2px}.arr-eq{font-family:Fredoka,sans-serif;font-size:20px;font-weight:700;color:var(--ink);min-height:28px;margin-top:10px}.arr-sub-eq{font-family:Fredoka,sans-serif;font-size:15px;color:var(--muted);margin-top:4px;line-height:1.5}.arr-sub-eq .eq-solved{color:var(--green-ink);font-weight:700}.arr-sub-eq .eq-q{color:var(--brand);font-weight:700}.arr-done-facts{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:16px 0}.arr-done-chip{background:var(--green-50);color:var(--green-ink);border-radius:999px;padding:.3rem .85rem;font-family:Fredoka,sans-serif;font-weight:700;font-size:18px}.arr-done-chip--gold{background:var(--sunny-50,#fef9c3);color:var(--sunny-ink,#854d0e);border:2px solid var(--sunny,#EAB308)}@media(max-width:400px){.arr-game-wrap{--agcell:clamp(16px,3.5vw,22px);--agcell-gap:3px}}@media(prefers-reduced-motion:reduce){.agcell{transition:none}.agcell.ag-new,.arr-split-line,.arr-add-btn.tapped{animation:none}}.maze-wrap{max-width:620px;min-height:680px;margin:0 auto;padding:20px var(--pad) 64px;text-align:center}.maze-head{min-height:54px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;margin-bottom:2px}.maze-head .play-back{justify-self:start}.maze-head strong{font-family:Fredoka,sans-serif;font-size:19px;color:var(--brand);font-variant-numeric:tabular-nums}.maze-head>span{justify-self:end;font-size:28px}.maze-intro{display:grid;justify-items:center;align-content:start;padding-top:38px}.maze-intro>.play-back{justify-self:start;width:100%;text-align:left}.maze-intro h1,.maze-finish h1{font-size:clamp(34px,7vw,48px);color:var(--ink);margin:24px 0 10px;text-wrap:balance}.maze-intro>p{max-width:29rem;color:var(--muted);font-size:18px;line-height:1.45;text-wrap:balance}.maze-demo{width:min(100%,420px);margin:26px auto 28px;padding:20px;border:2px solid var(--brand-100);border-radius:28px;background:var(--brand-50)}.maze-demo-sum{font-family:Fredoka,sans-serif;font-size:32px;font-weight:700;color:var(--ink)}.maze-demo-gates{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:16px}.maze-demo-gates span{position:relative;min-height:64px;display:grid;place-items:center;border:2px solid var(--line);border-radius:18px;background:var(--surface);font-family:Fredoka,sans-serif;font-size:25px;font-weight:700;color:var(--ink)}.maze-demo-gates span.right{border-color:var(--green);background:var(--green-50);color:var(--green-ink);box-shadow:0 5px 0 -2px color-mix(in srgb,var(--green) 70%,transparent)}.maze-demo-gates b{position:absolute;right:5px;top:-18px;font-size:20px;transform:rotate(12deg)}.maze-board{position:relative;isolation:isolate;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);width:min(100%,390px);aspect-ratio:1.18;margin:0 auto 4px;border-radius:36px;background:linear-gradient(145deg,var(--green-50),var(--sky-50));box-shadow:inset 0 0 0 2px color-mix(in srgb,var(--green) 20%,transparent)}.maze-corridor{position:absolute;z-index:-1;display:block;border-radius:999px;background:var(--surface);box-shadow:inset 0 0 0 2px var(--line);transition:background .2s ease,box-shadow .2s ease}.maze-corridor.horizontal{height:12px;transform:translateY(-50%)}.maze-corridor.vertical{width:12px;transform:translate(-50%)}.maze-corridor.open{background:var(--green-50);box-shadow:inset 0 0 0 2px var(--green)}.maze-room{z-index:1;place-self:center;width:clamp(56px,16vw,72px);height:clamp(56px,16vw,72px);display:grid;place-items:center;border-radius:24px;border:3px dashed var(--brand-100);background:var(--surface);color:var(--muted);box-shadow:var(--shadow-sm);transition:transform .2s cubic-bezier(.23,1,.32,1),background .2s ease,border-color .2s ease}.maze-room.complete{border-style:solid;border-color:var(--green);background:var(--green-50);color:var(--green-ink)}.maze-room.current{border-style:solid;border-color:var(--brand);background:var(--brand-50);transform:scale(1.06);box-shadow:0 0 0 5px color-mix(in srgb,var(--brand) 15%,transparent),var(--shadow-sm)}.maze-room.goal:not(.current){border-style:solid;border-color:var(--sunny);background:var(--sunny-50)}.maze-pet{width:58px;height:64px;animation:maze-arrive .28s cubic-bezier(.23,1,.32,1)}.maze-bloom{font-size:28px;color:var(--green-ink);line-height:1}.maze-treasure{font-size:31px}.maze-dot{font-size:28px;color:var(--brand-100)}@keyframes maze-arrive{0%{opacity:.5;transform:translateY(10px) scale(.92)}to{opacity:1;transform:translateY(0) scale(1)}}.maze-question{max-width:520px;margin:6px auto 0}.maze-equation{font-family:Fredoka,sans-serif;font-size:clamp(34px,8vw,48px);font-weight:700;line-height:1;color:var(--ink);font-variant-numeric:tabular-nums}.maze-feedback{min-height:34px;margin:8px 0 10px;color:var(--ink);font-family:Fredoka,sans-serif;font-size:19px;font-weight:700}.maze-gates{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.maze-gate{min-height:82px;display:grid;grid-template-columns:1fr auto;align-items:center;padding:10px 14px;border:3px solid var(--brand-100);border-radius:22px;background:var(--surface);color:var(--ink);box-shadow:0 6px 0 -2px var(--brand-100);cursor:pointer;transition:transform .14s cubic-bezier(.23,1,.32,1),box-shadow .14s ease,border-color .14s ease,background .14s ease}.maze-gate span{font-family:Fredoka,sans-serif;font-size:clamp(25px,6vw,34px);font-weight:700;font-variant-numeric:tabular-nums}.maze-gate i{font-size:22px;font-style:normal;color:var(--brand)}.maze-gate:active:not(:disabled){transform:scale(.97) translateY(2px);box-shadow:0 3px 0 -2px var(--brand-100)}.maze-gate:focus-visible{outline:3px solid var(--coral);outline-offset:3px}.maze-gate.blocked{border-style:dotted;border-color:var(--sunny);background:var(--sunny-50);box-shadow:none;color:var(--muted);opacity:1;cursor:default}.maze-gate.blocked i{color:#8a6508}.maze-gate.opened{border-color:var(--green);background:var(--green-50);color:var(--green-ink);box-shadow:0 6px 0 -2px var(--green)}.maze-gate.opened i{color:var(--green-ink)}.maze-gate.hint{border-color:var(--brand);box-shadow:0 0 0 5px color-mix(in srgb,var(--brand) 14%,transparent),0 6px 0 -2px var(--brand-100)}.maze-finish{margin-top:8px}.maze-finish h1{margin-top:10px}@media(hover:hover)and (pointer:fine){.maze-gate:hover:not(:disabled){transform:translateY(-2px);border-color:var(--brand);box-shadow:0 8px 0 -2px var(--brand-100)}}@media(max-width:430px){.maze-wrap{min-height:610px;padding-left:16px;padding-right:16px}.maze-board{width:min(100%,330px);border-radius:28px}.maze-room{width:56px;height:56px;border-radius:19px}.maze-pet{width:49px;height:54px}.maze-gates{gap:8px}.maze-gate{min-height:72px;padding:8px 9px;border-radius:18px}.maze-feedback{margin-top:6px;margin-bottom:6px}.maze-intro{padding-top:20px}}@media(prefers-reduced-motion:reduce){.maze-corridor,.maze-room,.maze-gate{transition:none}.maze-room.current{transform:none}.maze-pet{animation:none}.maze-demo-gates b{transform:none}}.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}.trail-wrap{max-width:680px;min-height:700px;margin:0 auto;padding:18px var(--pad) 68px;text-align:center}.trail-head{min-height:54px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;margin-bottom:2px}.trail-head .play-back{justify-self:start}.trail-head strong{font-family:Fredoka,sans-serif;font-size:19px;color:var(--brand);font-variant-numeric:tabular-nums}.trail-head>span{justify-self:end;min-width:52px;padding:6px 10px;border-radius:999px;background:var(--brand-50);color:var(--brand);font-family:Fredoka,sans-serif;font-size:18px;font-weight:700}.trail-intro{display:grid;justify-items:center;align-content:start;padding-top:30px}.trail-intro>.play-back{justify-self:start;width:100%;text-align:left}.trail-kicker{margin:10px 0 -2px!important;color:var(--green);font-family:Fredoka,sans-serif;font-size:25px!important;font-weight:700;letter-spacing:.25em}.trail-intro h1,.trail-finish h1{margin:6px 0 10px;color:var(--ink);font-size:clamp(36px,7vw,52px);line-height:1;text-wrap:balance}.trail-intro>p:not(.trail-kicker):not(.trail-pick-label){max-width:32rem;margin:0 auto;color:var(--muted);font-size:18px;line-height:1.45;text-wrap:balance}.trail-demo{position:relative;display:flex;align-items:center;justify-content:center;gap:9px;width:min(100%,430px);margin:22px auto 18px;padding:20px 24px;border-radius:30px;background:linear-gradient(145deg,var(--green-50),var(--sky-50));box-shadow:inset 0 0 0 2px color-mix(in srgb,var(--green) 22%,transparent)}.trail-demo span{width:64px;height:64px;display:grid;place-items:center;border:2px solid var(--green);border-radius:22px;background:var(--surface);color:var(--ink);font-family:Fredoka,sans-serif;font-size:26px;font-weight:700;box-shadow:0 5px 0 -2px color-mix(in srgb,var(--green) 70%,transparent)}.trail-demo span.mystery{border-style:dashed;border-color:var(--brand);color:var(--brand)}.trail-demo i{color:var(--brand);font-family:Fredoka,sans-serif;font-size:15px;font-weight:700;font-style:normal}.trail-demo b{position:absolute;right:12%;top:5px;font-size:22px;transform:rotate(12deg)}.trail-pick-label{margin:2px 0 9px;color:var(--ink);font-family:Fredoka,sans-serif;font-size:17px;font-weight:700}.trail-pick{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;max-width:520px;margin:0 auto 20px}.trail-pick button{min-width:49px;height:49px;padding:0 10px;border:2px solid var(--line);border-radius:15px;background:var(--surface);color:var(--ink);font-family:Fredoka,sans-serif;font-size:18px;font-weight:700;cursor:pointer;transition:transform .14s cubic-bezier(.23,1,.32,1),border-color .14s ease,background .14s ease}.trail-pick button.selected{border-color:var(--brand);background:var(--brand);color:#fff;box-shadow:0 4px 0 -1px var(--brand-700)}.trail-pick button:active{transform:scale(.97)}.trail-landscape{position:relative;isolation:isolate;width:min(100%,600px);height:360px;margin:0 auto 2px;overflow:hidden;border-radius:38px;background:linear-gradient(165deg,var(--sky-50) 0 50%,var(--green-50) 50%);box-shadow:inset 0 0 0 2px color-mix(in srgb,var(--green) 20%,transparent)}.trail-landscape.theme-1{background:linear-gradient(165deg,#ede9fe 0 50%,#ddd6fe 50%)}.trail-landscape.theme-2{background:linear-gradient(165deg,#e0f2fe 0 50%,#cffafe 50%)}[data-theme=dark] .trail-landscape{background:linear-gradient(165deg,#12354b 0 50%,#173c2b 50%)}[data-theme=dark] .trail-landscape.theme-1{background:linear-gradient(165deg,#201c42 0 50%,#35255d 50%)}[data-theme=dark] .trail-landscape.theme-2{background:linear-gradient(165deg,#12354b 0 50%,#164e63 50%)}.trail-line{position:absolute;z-index:-1;inset:0;width:100%;height:100%;overflow:visible}.trail-line polyline{fill:none;stroke:var(--surface);stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:1.2 3}.trail-line polyline.grown{stroke:var(--green);stroke-width:4.5;stroke-dasharray:100;transition:stroke-dashoffset .24s cubic-bezier(.23,1,.32,1)}.trail-sky-mark{position:absolute;right:8%;top:8%;color:var(--sunny);font-size:42px;line-height:1}.theme-1 .trail-sky-mark{color:var(--brand)}.theme-2 .trail-sky-mark{color:#fff}.trail-goal{position:absolute;right:1.5%;top:4%;font-size:34px;transform:rotate(4deg)}.trail-stone{position:absolute;width:clamp(54px,10vw,68px);height:clamp(54px,10vw,68px);display:grid;place-items:center;border:3px dashed var(--brand-100);border-radius:42% 58% 48% 52%;background:var(--surface);color:var(--brand-100);box-shadow:0 6px 0 -2px color-mix(in srgb,var(--ink) 12%,transparent);transform:translate(-50%,-50%);transition:background .18s ease,border-color .18s ease,color .18s ease,box-shadow .18s ease}.trail-stone b{font-family:Fredoka,sans-serif;font-size:clamp(17px,3.4vw,22px);font-weight:700;font-variant-numeric:tabular-nums}.trail-stone.reached{border-style:solid;border-color:var(--green);background:var(--green-50);color:var(--green-ink);box-shadow:0 6px 0 -2px color-mix(in srgb,var(--green) 65%,transparent)}.trail-stone.current{z-index:2;border-color:var(--brand);background:var(--brand-50);color:var(--brand);box-shadow:0 0 0 6px color-mix(in srgb,var(--brand) 14%,transparent),0 6px 0 -2px var(--brand-100)}.trail-stone i{position:absolute;right:-6px;top:-12px;color:var(--green-ink);font-size:19px;font-style:normal;animation:trail-bloom .22s cubic-bezier(.23,1,.32,1)}@keyframes trail-bloom{0%{opacity:0;transform:translateY(6px) scale(.85)}to{opacity:1;transform:translateY(0) scale(1)}}.trail-pet{position:absolute;z-index:3;width:56px;height:62px;left:50%;bottom:24px;transform:translate(-50%)}.trail-pet.hop{animation:trail-hop .26s cubic-bezier(.23,1,.32,1)}@keyframes trail-hop{0%{opacity:.6;transform:translate(-50%,10px) scale(.94)}70%{transform:translate(-50%,-5px) scale(1.03)}to{opacity:1;transform:translate(-50%) scale(1)}}.trail-friend{position:absolute;z-index:2;right:1%;top:8%;width:48px;height:53px;transform:rotate(5deg)}.trail-question{max-width:540px;margin:4px auto 0}.trail-question h2{margin:0;color:var(--ink);font-family:Fredoka,sans-serif;font-size:clamp(30px,7vw,42px);line-height:1.05;font-variant-numeric:tabular-nums;letter-spacing:.03em}.trail-question h2:focus-visible,.trail-finish h1:focus-visible{outline:3px solid var(--coral);outline-offset:4px;border-radius:8px}.trail-jump-hint{height:22px;display:flex;align-items:center;justify-content:center;gap:3px;margin-top:3px;opacity:0;color:var(--brand);transition:opacity .14s ease}.trail-jump-hint.visible{opacity:1}.trail-jump-hint span{font-size:7px}.trail-jump-hint b{margin-left:5px;font-family:Fredoka,sans-serif;font-size:14px}.trail-last-fact{min-height:21px;margin:0;color:var(--green-ink);font-family:Fredoka,sans-serif;font-size:16px;font-weight:700}.trail-feedback{min-height:30px;margin:2px 0 8px;color:var(--ink);font-family:Fredoka,sans-serif;font-size:17px;font-weight:700}.trail-choices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.trail-choices button{min-height:78px;display:grid;grid-template-columns:1fr auto;align-items:center;padding:10px 14px;border:3px solid var(--brand-100);border-radius:24px;background:var(--surface);color:var(--ink);box-shadow:0 6px 0 -2px var(--brand-100);cursor:pointer;transition:transform .14s cubic-bezier(.23,1,.32,1),box-shadow .14s ease,border-color .14s ease,background .14s ease}.trail-choices button span{font-family:Fredoka,sans-serif;font-size:clamp(25px,6vw,34px);font-weight:700;font-variant-numeric:tabular-nums}.trail-choices button i{color:var(--brand);font-size:21px;font-style:normal}.trail-choices button:active:not([aria-disabled=true]){transform:scale(.97);box-shadow:0 3px 0 -2px var(--brand-100)}.trail-choices button:focus-visible,.trail-pick button:focus-visible,.trail-themes button:focus-visible{outline:3px solid var(--coral);outline-offset:3px}.trail-choices button.blocked{border-style:dotted;border-color:var(--sunny);background:var(--sunny-50);color:var(--muted);box-shadow:none;cursor:default;opacity:1}.trail-choices button.blocked i{color:#8a6508}.trail-choices button[aria-disabled=true]{cursor:default}.trail-choices button.landed{border-color:var(--green);background:var(--green-50);color:var(--green-ink);box-shadow:0 6px 0 -2px var(--green)}.trail-choices button.hint{border-color:var(--brand);box-shadow:0 0 0 5px color-mix(in srgb,var(--brand) 14%,transparent),0 6px 0 -2px var(--brand-100)}.trail-finish{margin-top:10px}.trail-finish h1{margin-bottom:14px}.trail-themes{display:flex;justify-content:center;gap:9px;margin:0 auto 12px}.trail-themes button{width:50px;height:44px;border:2px solid var(--line);border-radius:15px;background:var(--surface);font-size:20px;cursor:pointer;transition:transform .14s cubic-bezier(.23,1,.32,1),border-color .14s ease}.trail-themes button.selected{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-50)}.trail-themes button:active{transform:scale(.97)}.trail-finish .trail-pick{margin-bottom:14px}.trail-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:10px}@media(hover:hover)and (pointer:fine){.trail-pick button:hover,.trail-themes button:hover{transform:translateY(-2px);border-color:var(--brand)}.trail-choices button:hover:not([aria-disabled=true]){transform:translateY(-2px);border-color:var(--brand);box-shadow:0 8px 0 -2px var(--brand-100)}}@media(max-width:480px){.trail-wrap{min-height:640px;padding-left:14px;padding-right:14px}.trail-landscape{height:330px;border-radius:28px}.trail-stone{width:52px;height:52px}.trail-pet{width:48px;height:53px;bottom:20px}.trail-choices{gap:8px}.trail-choices button{min-height:72px;padding:8px 9px;border-radius:19px}.trail-actions{flex-direction:column}.trail-actions .btn{justify-content:center}.trail-demo{padding-left:12px;padding-right:12px}.trail-demo span{width:56px;height:56px;border-radius:19px}}@media(max-height:760px){.trail-wrap:not(.trail-intro){min-height:0;padding-top:8px;padding-bottom:36px}.trail-landscape{height:250px}.trail-head{min-height:44px}.trail-question h2{font-size:30px}.trail-jump-hint{height:18px}.trail-feedback{min-height:24px;margin-bottom:5px}.trail-last-fact{min-height:18px;font-size:14px}.trail-choices button{min-height:66px}}@media(prefers-reduced-motion:reduce){.trail-line polyline.grown,.trail-stone,.trail-jump-hint,.trail-choices button,.trail-pick button,.trail-themes button{transition:none}.trail-stone i,.trail-pet.hop{animation:none}.trail-demo b,.trail-goal,.trail-friend{transform:none}}.trail-wrap.reduce-motion .trail-line polyline.grown,.trail-wrap.reduce-motion .trail-stone,.trail-wrap.reduce-motion .trail-jump-hint,.trail-wrap.reduce-motion .trail-choices button,.trail-wrap.reduce-motion .trail-pick button,.trail-wrap.reduce-motion .trail-themes button{transition:none}.trail-wrap.reduce-motion .trail-stone i,.trail-wrap.reduce-motion .trail-pet.hop{animation:none}.bridge-wrap{max-width:720px;min-height:720px;margin:0 auto;padding:18px var(--pad) 68px;text-align:center}.bridge-head{min-height:54px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;margin-bottom:2px}.bridge-head .play-back{justify-self:start}.bridge-head-actions{justify-self:end;display:flex;align-items:center;gap:7px}.bridge-current{min-width:62px;padding:6px 10px;border-radius:999px;background:var(--brand-50);color:var(--brand);font-family:Fredoka,sans-serif;font-size:18px;font-weight:700}.bridge-history-toggle{min-width:45px;min-height:38px;padding:5px 9px;border:2px solid var(--green);border-radius:999px;background:var(--green-50);color:var(--green-ink);font-family:Fredoka,sans-serif;font-size:16px;font-weight:700;cursor:pointer;transition:transform .14s cubic-bezier(.23,1,.32,1),background .14s ease}.bridge-history-toggle:focus-visible,.bridge-hint-button:focus-visible,.bridge-factor-picks button:focus-visible,.bridge-factor-entry input:focus-visible,.bridge-factor-entry button:focus-visible{outline:3px solid var(--coral);outline-offset:3px}.bridge-pips{display:flex;align-items:center;gap:7px;padding:8px 12px;border:1.5px solid var(--line);border-radius:999px;background:var(--surface)}.bridge-pips i{width:12px;height:12px;border:2px solid var(--brand-100);border-radius:50%;background:transparent}.bridge-pips i.on{border-color:var(--green);background:var(--green)}.bridge-intro{display:grid;justify-items:center;align-content:start;padding-top:30px}.bridge-intro>.play-back{justify-self:start;width:100%;text-align:left}.bridge-eyebrow{width:66px;height:66px;display:grid;place-items:center;margin:8px auto;border-radius:22px;background:var(--brand-50);font-size:34px;transform:rotate(-3deg)}.bridge-intro h1,.bridge-done h1{margin:12px 0 10px;color:var(--ink);font-size:clamp(36px,7vw,52px);line-height:1;text-wrap:balance}.bridge-intro>p{max-width:34rem;margin:0 auto;color:var(--muted);font-size:18px;line-height:1.45;text-wrap:balance}.bridge-demo{width:min(100%,450px);margin:24px auto 16px;padding:18px 22px;border:2px solid var(--brand-100);border-radius:30px;background:linear-gradient(150deg,var(--brand-50),var(--sky-50));box-shadow:var(--shadow-sm)}.bridge-demo>strong{display:block;color:var(--ink);font-family:Fredoka,sans-serif;font-size:32px}.bridge-demo>div{display:flex;align-items:center;justify-content:center;gap:10px;margin:12px 0}.bridge-demo span{padding:9px 13px;border-radius:13px;background:var(--surface);color:var(--brand);font-family:Fredoka,sans-serif;font-size:19px;font-weight:700;box-shadow:0 3px 0 -1px var(--brand-100)}.bridge-demo b{color:var(--coral);font-size:23px}.bridge-demo>i{color:var(--green-ink);font-family:Fredoka,sans-serif;font-size:20px;font-weight:700;font-style:normal}.bridge-config{width:min(100%,520px);margin:0 auto 18px;padding:15px 16px 10px;border:2px solid var(--brand-100);border-radius:24px;background:var(--surface);box-shadow:var(--shadow-sm)}.bridge-config.compact{margin-top:12px;margin-bottom:14px;box-shadow:none}.bridge-config>h2{margin:0 0 11px;color:var(--ink);font-size:19px;line-height:1.2}.bridge-factor-picks{display:grid;justify-items:center;gap:9px}.bridge-factor-grid{display:grid;grid-template-columns:repeat(6,46px);justify-content:center;gap:8px}.bridge-factor-picks button{min-width:46px;height:46px;display:inline-flex;align-items:center;justify-content:center;gap:5px;padding:0 11px;border:2px solid var(--brand-100);border-radius:15px;background:var(--surface);color:var(--ink);font-family:Fredoka,sans-serif;font-size:19px;font-weight:700;cursor:pointer;transition:transform .14s cubic-bezier(.23,1,.32,1),border-color .14s ease,background .14s ease,color .14s ease}.bridge-factor-picks button.bridge-smart{padding-inline:14px;font-size:16px}.bridge-factor-picks button.selected{border-color:var(--brand);background:var(--brand);color:#fff;box-shadow:0 4px 0 -2px var(--brand-100)}.bridge-factor-picks button i{min-width:11px;font-size:13px;font-style:normal}.bridge-factor-entry{width:min(100%,352px);margin:12px auto 0;text-align:left}.bridge-factor-entry label{display:block;margin:0 0 5px;color:var(--muted);font-size:14px;font-weight:700}.bridge-factor-entry>div{display:grid;grid-template-columns:1fr 46px;gap:7px}.bridge-factor-entry input{width:100%;min-width:0;height:46px;padding:8px 12px;border:2px solid var(--line);border-radius:14px;background:var(--bg);color:var(--ink);font:700 17px Fredoka,sans-serif;letter-spacing:.04em}.bridge-factor-entry input[aria-invalid=true]{border-color:#b47b00;background:var(--sunny-50)}.bridge-factor-entry button{width:46px;height:46px;border:0;border-radius:14px;background:var(--brand);color:#fff;font:700 25px Fredoka,sans-serif;cursor:pointer;transition:transform .14s cubic-bezier(.23,1,.32,1),filter .14s ease}.bridge-factor-status{min-height:19px;margin:4px 0 0;color:var(--green-ink);font-size:13px;font-weight:700}.bridge-factor-status.invalid{color:#765400}.bridge-scene{position:relative;isolation:isolate;width:min(100%,640px);height:330px;margin:0 auto 4px;overflow:hidden;border-radius:38px;background:linear-gradient(180deg,var(--sky-50) 0 64%,#bde8f5 64%);box-shadow:inset 0 0 0 2px color-mix(in srgb,var(--brand) 14%,transparent)}.bridge-scene.round-1{background:linear-gradient(180deg,#f5e9ff 0 64%,#c4b5fd 64%)}.bridge-scene.round-2{background:linear-gradient(180deg,#fff7d6 0 64%,#9bdcf0 64%)}[data-theme=dark] .bridge-scene{background:linear-gradient(180deg,#152f49 0 64%,#164e63 64%)}[data-theme=dark] .bridge-scene.round-1{background:linear-gradient(180deg,#28204f 0 64%,#44366f 64%)}[data-theme=dark] .bridge-scene.round-2{background:linear-gradient(180deg,#47381d 0 64%,#164e63 64%)}.bridge-cloud{position:absolute;color:#fff;font-size:34px;opacity:.8}.bridge-cloud.c1{left:10%;top:8%}.bridge-cloud.c2{right:14%;top:17%;font-size:26px}.bridge-cliff{position:absolute;z-index:1;bottom:0;width:27%;height:55%;background:var(--green-50);border-top:9px solid var(--green);box-shadow:inset 0 9px #ffffff47}.bridge-cliff.left{left:0;border-radius:0 58px 0 0}.bridge-cliff.right{right:0;border-radius:58px 0 0}.bridge-cliff>span:first-child{position:absolute;top:-30px;color:var(--green-ink);font-size:25px}.bridge-cliff.left>span:first-child{left:28%}.bridge-cliff.right>span:first-child{right:42%}.bridge-cliff.right>span:last-child{position:absolute;right:8%;top:-48px;font-size:35px;transform:rotate(4deg)}.bridge-river{position:absolute;z-index:0;left:25%;right:25%;bottom:0;height:42%;display:flex;justify-content:space-around;padding-top:38px;background:linear-gradient(180deg,#93d8ef,#58b9df);clip-path:polygon(0 16%,100% 0,100% 100%,0 100%)}.bridge-river i{width:46px;height:8px;border-radius:50%;background:#ffffff8c;transform:rotate(-4deg)}.bridge-span{position:absolute;z-index:3;top:48%;width:30%;height:68px;display:grid;place-items:center;padding:8px 12px;border:3px dashed var(--brand-100);border-radius:18px;background:color-mix(in srgb,var(--surface) 82%,transparent);color:var(--muted);box-shadow:0 7px 0 -3px color-mix(in srgb,var(--ink) 16%,transparent);transform-origin:center}.bridge-span.left{left:21%;transform:rotate(-3deg)}.bridge-span.right{right:21%;transform:rotate(3deg)}.bridge-span:before,.bridge-span:after{content:"";position:absolute;left:9px;right:9px;height:5px;border-radius:999px;background:currentColor;opacity:.22}.bridge-span:before{top:13px}.bridge-span:after{bottom:13px}.bridge-span b{z-index:1;font-family:Fredoka,sans-serif;font-size:clamp(16px,3vw,21px);font-weight:700}.bridge-span i{position:absolute;z-index:2;top:-16px;min-width:32px;height:32px;display:grid;place-items:center;padding:0 6px;border:2px solid currentColor;border-radius:10px;background:var(--surface);font-family:Fredoka,sans-serif;font-size:16px;font-weight:700;font-style:normal;box-shadow:0 3px color-mix(in srgb,currentColor 18%,transparent)}.bridge-span.left i{left:12px}.bridge-span.right i{right:12px}.bridge-span.built{border-style:solid;border-color:var(--green);background:#bff3cd;color:var(--green-ink);box-shadow:0 7px 0 -3px color-mix(in srgb,var(--green) 70%,transparent)}.bridge-span.preview{border-style:solid;border-color:var(--brand);background:var(--brand-50);color:var(--brand);box-shadow:0 7px 0 -3px var(--brand-100)}[data-theme=dark] .bridge-span.built{background:#14532d;color:#dcfce7}.bridge-keystone{position:absolute;z-index:5;left:50%;top:52%;width:48px;height:48px;display:grid;place-items:center;border:3px dashed var(--brand-100);border-radius:15px;background:var(--surface);color:var(--brand);font-family:Fredoka,sans-serif;font-size:18px;font-weight:700;transform:translate(-50%,-50%)}.bridge-keystone.built{border-style:solid;border-color:var(--brand);background:var(--brand);color:#fff;box-shadow:0 0 0 5px color-mix(in srgb,var(--brand) 14%,transparent)}.bridge-pet{position:absolute;z-index:6;left:8%;bottom:39%;width:66px;height:73px;transform:translate(0)}.bridge-pet.crossed{transform:translate(clamp(300px,66vw,455px))}.bridge-pet.moving{filter:drop-shadow(0 8px 8px rgba(42,36,64,.16));transition:transform .26s cubic-bezier(.77,0,.175,1)}.bridge-friend{position:absolute;z-index:5;right:5%;bottom:40%;width:58px;height:64px;transform:rotate(4deg)}.bridge-question{max-width:570px;margin:3px auto 0}.bridge-question h2{margin:0;color:var(--ink);font-family:Fredoka,sans-serif;font-size:clamp(31px,7vw,44px);line-height:1.08;font-variant-numeric:tabular-nums}.bridge-question h2:focus-visible,.bridge-done h1:focus-visible{outline:3px solid var(--coral);outline-offset:4px;border-radius:8px}.bridge-question>p:not(.bridge-feedback){margin:5px auto 12px;color:var(--muted);font-size:16px}.bridge-feedback{min-height:31px;margin:7px 0 8px;color:var(--ink);font-family:Fredoka,sans-serif;font-size:18px;font-weight:700}.bridge-hint-row{display:flex;justify-content:center;margin:-2px 0 10px}.bridge-hint-button{min-height:44px;display:flex;align-items:center;gap:10px;padding:7px 13px;border:2px solid var(--brand-100);border-radius:999px;background:var(--brand-50);color:var(--brand);font-family:Fredoka,sans-serif;font-size:15px;font-weight:700;cursor:pointer;transition:transform .14s cubic-bezier(.23,1,.32,1),border-color .14s ease,background .14s ease}.bridge-hint-button>i{display:flex;gap:4px}.bridge-hint-button>i b{width:8px;height:8px;border:1.5px solid currentColor;border-radius:50%;background:transparent}.bridge-hint-button>i b.on{background:currentColor}.bridge-hint-button:disabled{cursor:default;opacity:.68}.bridge-choices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.bridge-choices button{min-height:78px;display:grid;grid-template-columns:1fr auto;align-items:center;padding:10px 14px;border:3px solid var(--brand-100);border-radius:23px;background:var(--surface);color:var(--ink);box-shadow:0 6px 0 -2px var(--brand-100);cursor:pointer;transition:transform .14s cubic-bezier(.23,1,.32,1),box-shadow .14s ease,border-color .14s ease,background .14s ease}.bridge-choices button span{font-family:Fredoka,sans-serif;font-size:clamp(25px,6vw,34px);font-weight:700}.bridge-choices button i{color:var(--brand);font-size:21px;font-style:normal}.bridge-choices button[aria-disabled=true]{cursor:default}.bridge-choices button.blocked{border-style:dotted;border-color:var(--sunny);background:var(--sunny-50);color:var(--muted);box-shadow:none}.bridge-choices button.hint{border-color:var(--brand);box-shadow:0 0 0 5px color-mix(in srgb,var(--brand) 14%,transparent),0 6px 0 -2px var(--brand-100)}.bridge-choices button:focus-visible,.bridge-routes button:focus-visible{outline:3px solid var(--coral);outline-offset:3px}.bridge-routes{display:grid;grid-template-columns:1fr 1fr;gap:12px}.bridge-routes button{min-height:86px;display:grid;grid-template-columns:30px 1fr auto 1fr;align-items:center;gap:7px;padding:12px;border:2px solid var(--brand-100);border-radius:20px;background:var(--surface);color:var(--ink);box-shadow:0 5px 0 -2px var(--brand-100);cursor:pointer;transition:transform .14s cubic-bezier(.23,1,.32,1),border-color .14s ease,box-shadow .14s ease}.bridge-routes button>i{width:28px;height:28px;display:grid;place-items:center;border-radius:9px;background:var(--brand-50);color:var(--brand);font-family:Fredoka,sans-serif;font-weight:700;font-style:normal}.bridge-routes button>span{font-family:Fredoka,sans-serif;font-size:clamp(16px,3vw,20px);font-weight:700}.bridge-routes button>b{color:var(--coral);font-size:20px}.bridge-solved{padding-top:18px;color:var(--green-ink)!important}.bridge-solved-state>p{margin:7px 0 12px;color:var(--muted);font-family:Fredoka,sans-serif;font-size:19px;font-weight:700}.bridge-solved-state .btn{min-width:120px;justify-content:center}.bridge-history{max-width:640px;margin:0 auto 10px;padding:12px;border:2px solid var(--brand-100);border-radius:22px;background:var(--surface);box-shadow:var(--shadow-sm)}.bridge-history>h2{margin:0 0 9px;color:var(--ink);font-size:18px}.bridge-history-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:8px}.bridge-history article{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:5px;padding:9px;border-radius:14px;background:var(--brand-50);color:var(--ink);font-family:Fredoka,sans-serif;font-size:14px}.bridge-history article>strong{grid-column:1/-1;color:var(--green-ink);font-size:17px}.bridge-history article>span{white-space:nowrap}.bridge-history article>b{color:var(--coral)}.bridge-done{margin-top:10px}.bridge-done h1{margin-bottom:13px}.bridge-facts{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:0 auto 18px}.bridge-facts span{padding:7px 12px;border:2px solid var(--green);border-radius:999px;background:var(--green-50);color:var(--green-ink);font-family:Fredoka,sans-serif;font-size:17px;font-weight:700}.bridge-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:10px}@media(hover:hover)and (pointer:fine){.bridge-choices button:hover:not([aria-disabled=true]),.bridge-routes button:hover{transform:translateY(-2px);border-color:var(--brand);box-shadow:0 8px 0 -2px var(--brand-100)}.bridge-hint-button:hover:not(:disabled){border-color:var(--brand);background:var(--surface)}.bridge-history-toggle:hover{background:var(--surface)}.bridge-factor-picks button:hover{transform:translateY(-2px);border-color:var(--brand)}.bridge-factor-entry button:hover{filter:brightness(1.08)}}@media(hover:hover)and (pointer:fine){.bridge-choices button:active:not([aria-disabled=true]),.bridge-routes button:active,.bridge-hint-button:active:not(:disabled),.bridge-history-toggle:active,.bridge-factor-picks button:active,.bridge-factor-entry button:active{transform:scale(.97)}}@media(max-width:500px){.bridge-wrap{min-height:650px;padding-left:14px;padding-right:14px}.bridge-head-actions{gap:4px}.bridge-current{min-width:0;padding:5px 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