:root{--font:ui-rounded, "SF Pro Rounded", "Nunito", "Baloo 2", "Segoe UI", system-ui, -apple-system, sans-serif;--ink:#1b2a4a;--ink-soft:#3f4f73;--paper:#fff;--sky-top:#bfe6ff;--sky-bottom:#eaf7ff;--primary:#2f6be0;--primary-ink:#fff;--accent:#ffc233;--accent-ink:#1b2a4a;--good-bg:#d9f7e5;--good-ink:#12502b;--good-line:#2e9e5b;--try-bg:#fff1dc;--try-ink:#6e3a00;--try-line:#e8a03a;--radius-lg:28px;--radius-md:20px;--shadow-card:0 8px 0 #1b2a4a1f, 0 14px 30px #1b2a4a1a;--shadow-btn:0 6px 0 #1b2a4a40;--tap:64px;--space:16px;--dur-fast:.15s;--dur:.35s;--dur-slow:.7s}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{min-height:100dvh;font-family:var(--font);color:var(--ink);background:linear-gradient(180deg, var(--sky-top) 0%, var(--sky-bottom) 70%);-webkit-tap-highlight-color:transparent;background-attachment:fixed;margin:0;font-size:1.125rem;line-height:1.4}h1,h2,p,ol,ul{margin:0}ol,ul{padding:0;list-style:none}button,select{font:inherit;color:inherit}:focus-visible{outline:4px solid var(--ink);outline-offset:3px;box-shadow:0 0 0 7px #fff}.sr-only{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.app{flex-direction:column;min-height:100dvh;display:flex;position:relative}.screen{z-index:1;width:min(100%,960px);padding:var(--space) var(--space) 140px;gap:var(--space);flex-direction:column;flex:1;margin:0 auto;display:flex;position:relative}.screen:focus,h1:focus{outline:none}.topbar{justify-content:space-between;align-items:center;gap:var(--space);display:flex}.points{background:var(--paper);box-shadow:var(--shadow-card);border-radius:999px;padding:8px 20px;font-size:1.5rem;font-weight:800}.backdrop{z-index:0;pointer-events:none;position:fixed;inset:0;overflow:hidden}.backdrop__mountains{width:100%;height:26vh;min-height:140px;position:absolute;bottom:0;left:0}.cloud{opacity:.9;font-size:4rem;animation:60s linear infinite drift;position:absolute}.cloud--a{top:6%;left:-10%}.cloud--b{font-size:3rem;animation-duration:90s;top:20%;left:30%}.cloud--c{font-size:5rem;animation-duration:120s;top:12%;left:70%}.btn{min-height:var(--tap);background:var(--primary);color:var(--primary-ink);cursor:pointer;box-shadow:var(--shadow-btn);transition:transform var(--dur-fast), box-shadow var(--dur-fast);border:0;border-radius:999px;padding:0 28px;font-size:1.35rem;font-weight:800}.btn:hover{transform:translateY(-2px)}.btn:active{transform:translateY(4px);box-shadow:0 2px #1b2a4a40}.btn--ghost{background:var(--paper);color:var(--ink)}.btn--accent{background:var(--accent);color:var(--accent-ink)}.btn--small{min-height:48px;padding:0 20px;font-size:1.05rem}.btn--round{width:var(--tap);padding:0;font-size:1.6rem}.mascot{transform-origin:50% 90%;font-size:4.5rem;line-height:1;display:inline-block}.mascot--cheer{animation:.8s ease-in-out 2 bounce}.mascot--think{animation:.6s ease-in-out tilt}.bubble{background:var(--paper);border-radius:var(--radius-md);box-shadow:var(--shadow-card);padding:14px 20px;font-size:1.3rem;font-weight:700;position:relative}.bubble:before{content:"";background:inherit;border-radius:4px;width:22px;height:22px;position:absolute;top:50%;left:-10px;transform:translateY(-50%)rotate(45deg)}.bubble--happy{background:var(--good-bg);color:var(--good-ink)}.hero{align-items:center;gap:var(--space);text-align:center;flex-direction:column;padding:8px 0;display:flex}.logo{letter-spacing:-.02em;color:var(--primary);text-shadow:0 4px #ffffffe6;font-size:clamp(2.6rem,9vw,4.5rem);font-weight:900}.logo__peaks{font-size:.8em;display:block}.hero__pip{align-items:center;gap:18px;max-width:100%;display:flex}.section-title{text-align:center;margin-bottom:12px;font-size:1.6rem}.grade-cards{gap:var(--space);grid-template-columns:repeat(auto-fit,minmax(240px,1fr));display:grid}.grade-card{border-radius:var(--radius-lg);background:var(--paper);width:100%;min-height:220px;box-shadow:var(--shadow-card);cursor:pointer;transition:transform var(--dur-fast);border:0;flex-direction:column;justify-content:center;align-items:center;gap:6px;padding:20px;display:flex;position:relative}.grade-card:hover{transform:translateY(-4px)}.grade-card:active{transform:translateY(2px)}.grade-card__emoji{font-size:4.5rem;line-height:1}.grade-card__label{font-size:1.9rem;font-weight:900}.grade-card__blurb{color:var(--ink-soft);font-weight:600}.grade-card__tag{background:var(--accent);color:var(--accent-ink);border-radius:999px;padding:4px 12px;font-size:.95rem;font-weight:800;position:absolute;top:12px;right:12px}.map-title{text-align:center;font-size:clamp(1.8rem,6vw,2.6rem);font-weight:900}.summit{background:var(--paper);box-shadow:var(--shadow-card);border-radius:999px;align-self:center;align-items:center;gap:12px;padding:10px 22px;font-weight:800;display:flex}.summit span{font-size:2rem}.summit[data-reached=true]{background:var(--accent);color:var(--accent-ink)}.trail{flex-direction:column;gap:22px;padding:8px 0;display:flex}.stop{background:var(--paper);border-radius:var(--radius-lg);width:min(100%,560px);box-shadow:var(--shadow-card);flex-direction:column;gap:14px;padding:18px;display:flex}.stop:nth-child(odd){align-self:flex-end}.stop:nth-child(2n){align-self:flex-start}.stop--locked{color:var(--ink-soft);background:#e9eef7}.stop__head{align-items:center;gap:14px;display:flex}.stop__emoji{background:var(--sky-bottom);border-radius:50%;flex:none;place-items:center;width:72px;height:72px;font-size:2.6rem;display:grid}.stop__title{font-size:1.6rem;font-weight:900}.stop__desc{color:var(--ink-soft);font-weight:600}.levels{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.level{border-radius:var(--radius-md);background:var(--primary);width:100%;min-height:76px;color:var(--primary-ink);cursor:pointer;box-shadow:var(--shadow-btn);border:0;flex-direction:column;justify-content:center;align-items:center;gap:2px;font-weight:800;display:flex}.level:active:not(:disabled){transform:translateY(4px);box-shadow:0 2px #1b2a4a40}.level--done{background:var(--accent);color:var(--accent-ink)}.level:disabled{color:#4a5a7a;box-shadow:none;cursor:not-allowed;background:#cfd8e8}.level__name{font-size:1.1rem}.level__stars{letter-spacing:2px;font-size:1.3rem}.basecamp{align-items:center;gap:16px;margin-top:8px;display:flex}.play-top{align-items:center;gap:var(--space);grid-template-columns:auto 1fr auto;display:grid}.progress{flex-direction:column;align-items:center;gap:4px;display:flex}.progress__track{justify-content:center;align-items:flex-end;gap:clamp(4px,1.4vw,12px);display:flex}.progress__pip{border:3px solid var(--paper);background:#ffffffbf;border-radius:50%;place-items:center;width:clamp(22px,5vw,36px);height:clamp(22px,5vw,36px);font-size:.9rem;font-weight:900;display:grid}.progress__pip--done{background:var(--good-line);color:#fff;border-color:var(--good-line)}.progress__pip--current{background:var(--accent);border-color:var(--accent);width:clamp(34px,7vw,52px);height:clamp(34px,7vw,52px)}.progress__climber{font-size:clamp(1.2rem,4vw,1.9rem);line-height:1}.progress__label{color:var(--ink-soft);font-size:1rem;font-weight:800}.stage{background:var(--paper);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);flex-direction:column;align-items:center;gap:20px;padding:clamp(16px,4vw,32px);display:flex;container-type:inline-size}.prompt{text-align:center;font-size:clamp(1.9rem,5.5vw,3rem);font-weight:900;line-height:1.15}.visual{justify-content:center;align-items:center;width:100%;min-height:120px;display:flex}.visual--numeral{color:var(--primary);font-size:clamp(6rem,22vw,10rem);font-weight:900;line-height:1}.counting{flex-direction:column;gap:12px}.objects--rows{grid-template-columns:repeat(var(--cols,5), minmax(0, 76px));justify-content:center;gap:8px;width:100%;max-width:560px;display:grid}.objects--scatter{width:min(100%,560px);height:260px;position:relative}.objects--scatter .object{position:absolute;transform:translate(-50%,-50%)}.object{cursor:pointer;width:76px;height:76px;transition:background var(--dur-fast);background:0 0;border:3px dashed #0000;border-radius:18px;place-items:center;padding:0;font-size:3rem;line-height:1;display:grid;position:relative}.objects--rows .object{aspect-ratio:1;width:100%;height:auto;font-size:clamp(2rem,9vw,3rem)}.object:hover{background:var(--sky-bottom)}.object--static{cursor:default;pointer-events:none}.object--counted{border-color:var(--primary);background:#dff1ff;border-style:solid}.object__badge{background:var(--primary);color:#fff;min-width:32px;height:32px;animation:pop var(--dur) ease-out;border-radius:999px;place-items:center;padding:0 6px;font-size:1.1rem;font-weight:900;display:grid;position:absolute;bottom:-6px;right:-4px}.equation-groups{flex-wrap:nowrap;gap:16px}.operator{color:var(--primary);font-size:3.5rem;font-weight:900}.emoji-group{grid-template-columns:repeat(var(--cols,5), auto);justify-content:center;gap:4px;font-size:clamp(2rem,8vw,2.6rem);line-height:1.1;display:grid}.emoji-group__item{display:inline-block;position:relative}.emoji-group__item--gone .emoji-group__emoji{opacity:.35;filter:grayscale()}.emoji-group__item--gone:after{content:"✕";color:#c2410c;text-shadow:0 0 #fff,0 2px #fff,0 -2px #fff,2px 0 #fff,-2px 0 #fff;place-items:center;font-size:2.2rem;font-weight:900;display:grid;position:absolute;inset:0}.equation{flex-wrap:nowrap;gap:clamp(6px,2vw,18px)}.equation__num,.equation__op{font-size:clamp(3.5rem,12vw,6rem);font-weight:900;line-height:1}.equation__op{color:var(--primary)}.equation__blank{width:clamp(64px,14vw,100px);height:clamp(72px,16vw,112px);color:var(--primary);border:5px dashed var(--primary);background:#eef4ff;border-radius:18px;place-items:center;font-size:clamp(2.6rem,9vw,4rem);font-weight:900;display:grid}.sequence{grid-template-columns:repeat(var(--cols,6), var(--item,56px));place-content:center;gap:10px;display:grid}.sequence__item{width:var(--item,56px);height:var(--item,56px);font-size:calc(var(--item,56px) * .62);background:#f3f7ff;border-radius:16px;place-items:center;line-height:1;display:grid}.sequence__item--blank{border:4px dashed var(--primary);color:var(--primary);background:#eef4ff;font-weight:900}.choices{gap:14px;width:100%;display:grid}.choices--text{grid-template-columns:repeat(auto-fit,minmax(120px,1fr))}.choices--symbol{grid-template-columns:repeat(auto-fit,minmax(100px,1fr))}.choices--group{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}.choice{border-radius:var(--radius-md);cursor:pointer;min-height:96px;transition:transform var(--dur-fast), background var(--dur-fast);background:#f3f7ff;border:4px solid #cfdcf5;place-items:center;padding:10px;display:grid;position:relative;box-shadow:0 6px #1b2a4a1f}.choice:hover:not(:disabled){background:#e3edff;transform:translateY(-2px)}.choice:active:not(:disabled){transform:translateY(4px);box-shadow:0 2px #1b2a4a1f}.choices--text .choice__label{font-size:3.4rem;font-weight:900}.choices--symbol .choice__label{font-size:3.6rem;line-height:1}.choices--group .choice{min-height:120px}.choices--group .choice__label{word-break:break-all;text-wrap:balance;letter-spacing:2px;font-size:2rem;line-height:1.15}.choice:disabled{cursor:default}.choice--wrong{background:var(--try-bg);border-color:var(--try-line);color:var(--try-ink);opacity:.7;animation:.4s shake}.choice--right{background:var(--good-bg);border-color:var(--good-line);color:var(--good-ink);animation:pop var(--dur) ease-out}.choice__mark{color:#fff;background:var(--try-line);border-radius:50%;place-items:center;width:36px;height:36px;font-size:1.3rem;font-weight:900;display:grid;position:absolute;top:-12px;right:-8px}.choice--right .choice__mark{background:var(--good-line)}.coach{z-index:2;padding:12px var(--space) calc(12px + env(safe-area-inset-bottom));-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);background:#ffffffeb;align-items:center;gap:16px;display:flex;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -6px 20px #1b2a4a1f}.coach .bubble{flex:1;font-size:clamp(1.05rem,2.6vw,1.3rem)}.coach__actions{gap:12px;display:flex}.screen--done{text-align:center;justify-content:center;align-items:center;gap:20px}.done-title{font-size:clamp(1.8rem,5.5vw,2.6rem);font-weight:900}.star-row{gap:8px;display:flex}.star{font-size:clamp(4.5rem,18vw,7.5rem);line-height:1}.star--on{animation:pop-in var(--dur-slow) cubic-bezier(.2, 1.6, .4, 1) both}.star--off{filter:grayscale();opacity:.3}.points-earned{color:var(--primary);font-size:2rem;font-weight:900}.done-actions{flex-wrap:wrap;justify-content:center;gap:14px;display:flex}.dialog{border-radius:var(--radius-lg);width:min(92vw,480px);color:var(--ink);box-shadow:var(--shadow-card);border:0;padding:24px}.dialog::backdrop{background:#1b2a4a8c}.dialog h2{margin-bottom:16px;font-size:1.8rem}.setting{align-items:center;gap:14px;min-height:56px;padding:12px 0;font-weight:700;display:flex}.setting input[type=checkbox]{width:32px;height:32px;accent-color:var(--primary);flex:none}.setting--select{flex-wrap:wrap;justify-content:space-between}.setting select{background:#fff;border:3px solid #cfdcf5;border-radius:14px;min-height:48px;padding:0 12px}.setting__help{color:var(--ink-soft);padding-bottom:8px;font-size:.95rem}.setting__help .btn{margin-bottom:8px}.setting select{max-width:100%}.dialog{max-height:92dvh;overflow-y:auto}.dialog__actions{justify-content:space-between;align-items:center;gap:12px;margin-top:16px;display:flex}.dialog__note{color:var(--ink-soft);margin-top:16px;font-size:.95rem}@container (width<=520px){.equation-groups{flex-direction:column;gap:4px}}@media (width<=420px){.play-top{gap:10px}.play-top .btn--round{width:52px;height:52px;min-height:52px;font-size:1.3rem}.progress__track{gap:3px}.progress__pip{border-width:2px;width:18px;height:18px}.progress__pip--current{width:30px;height:30px}.progress__climber{font-size:1.1rem}.screen--play{padding-bottom:150px}.coach{padding-top:8px;padding-bottom:calc(8px + env(safe-area-inset-bottom));gap:10px}.coach .mascot{font-size:2.2rem}.coach .bubble{padding:8px 12px;font-size:1rem}.coach__actions .btn{min-height:52px;padding:0 16px;font-size:1.05rem}}@media (width<=600px){.stop,.stop:nth-child(odd),.stop:nth-child(2n){align-self:stretch;width:100%}.coach{flex-wrap:wrap}.coach .mascot{font-size:3rem}.mascot{font-size:3.5rem}}@keyframes drift{0%{transform:translate(-20vw)}to{transform:translate(120vw)}}@keyframes bounce{0%,to{transform:translateY(0)rotate(0)}30%{transform:translateY(-18px)rotate(-6deg)}60%{transform:translateY(0)rotate(4deg)}}@keyframes tilt{0%,to{transform:rotate(0)}50%{transform:rotate(-10deg)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}75%{transform:translate(6px)}}@keyframes pop{0%{transform:scale(.8)}60%{transform:scale(1.08)}to{transform:scale(1)}}@keyframes pop-in{0%{opacity:0;transform:scale(0)rotate(-30deg)}to{opacity:1;transform:scale(1)rotate(0)}}html[data-motion=reduced] *,html[data-motion=reduced] :before,html[data-motion=reduced] :after{transition:none!important;animation:none!important}@media (prefers-reduced-motion:reduce){html:not([data-motion=full]) *,html:not([data-motion=full]) :before,html:not([data-motion=full]) :after{transition:none!important;animation:none!important}}.tenframes{flex-wrap:wrap;gap:20px}.tenframe{grid-template-columns:repeat(5, var(--cell,48px));border:4px solid var(--primary);background:#e8f0ff;border-radius:14px;gap:4px;padding:6px;display:grid}.tenframe__cell{width:var(--cell,48px);height:var(--cell,48px);background:#fff;border:2px solid #b9cdf5;border-radius:8px;position:relative}.tenframe__cell--on:after{content:"";background:#e5484d;border:3px solid #a3262b;border-radius:50%;position:absolute;inset:12%}@container (width<=420px){.tenframes{--cell:38px}}@container (width<=330px){.tenframes{--cell:32px}}.visual--shape .shape-svg{width:clamp(120px,34vw,200px);height:auto}.shape-svg{width:100%;height:auto;display:block}.bar-track{width:100%;display:flex}.bar-track--h{justify-content:flex-start;align-items:center;height:38px}.bar-track--v{box-sizing:border-box;justify-content:center;align-items:flex-end;height:150px;padding-top:28px}.bar{box-sizing:border-box;display:flex;position:relative}.bar i{display:block}.bar--plain{background:var(--bar-color);border:3px solid #1b2a4a;border-radius:14px}.bar-track--h .bar--plain{height:28px}.bar-track--v .bar--plain{width:34px}.bar--ribbon{background:var(--bar-color);clip-path:polygon(0 0,100% 0,calc(100% - 16px) 50%,100% 100%,0 100%);height:30px;box-shadow:inset 0 6px #ffffff59,inset 0 -6px #0000002e}.bar--rope{background:repeating-linear-gradient(-55deg, var(--bar-color) 0 7px, #fff9 7px 11px);border:3px solid #1b2a4a;border-radius:11px;height:22px}.bar--scarf{background:repeating-linear-gradient(90deg, var(--bar-color) 0 16px, #ffffff8c 16px 22px);border:3px solid #1b2a4a;border-radius:6px;height:30px}.bar--scarf:before,.bar--scarf:after{content:"";background:repeating-linear-gradient(0deg,#1b2a4a 0 3px,#0000 3px 7px);width:9px;position:absolute;top:0;bottom:0}.bar--scarf:before{left:0}.bar--scarf:after{right:0}.bar--pencil{height:30px}.bar--pencil .bar__eraser{background:#f4a3b5;border:3px solid #1b2a4a;border-right:0;border-radius:8px 0 0 8px;width:16px}.bar--pencil .bar__body{background:linear-gradient(#ffffff59 0 7px, transparent 7px), var(--bar-color);border-top:3px solid #1b2a4a;border-bottom:3px solid #1b2a4a;flex:1}.bar--pencil .bar__tip{clip-path:polygon(0 0,100% 50%,0 100%);background:linear-gradient(90deg,#f1d3a0 0 55%,#2b2b2b 55% 100%);width:28px}.bar--crayon{height:28px}.bar--crayon .bar__body{background:linear-gradient(90deg, transparent 0 18%, #fff9 18% 70%, transparent 70%), var(--bar-color);border:3px solid #1b2a4a;border-right:0;border-radius:8px 0 0 8px;flex:1}.bar--crayon .bar__tip{background:var(--bar-color);clip-path:polygon(0 0,100% 50%,0 100%);width:22px}.bar--tower{background:repeating-linear-gradient(0deg, #0000004d 0 3px, transparent 3px 22px), var(--bar-color);border:3px solid #1b2a4a;border-radius:4px;width:46px}.bar--candle{background:linear-gradient(90deg, #fff6 0 25%, transparent 25%), var(--bar-color);border:3px solid #1b2a4a;border-radius:6px 6px 3px 3px;width:30px}.bar--candle:before{content:"🔥";font-size:1.5rem;line-height:1;position:absolute;bottom:100%;left:50%;transform:translate(-50%)}.bar--tree{flex-direction:column;align-items:center;width:56px}.bar--tree .bar__foliage{background:#3aa65b;border:3px solid #1b2a4a;border-radius:50% 50% 46% 46%;flex:0 0 58%;width:100%}.bar--tree .bar__trunk{background:#9b6a3c;border:3px solid #1b2a4a;border-top:0;flex:1;width:16px}.bar--plant{justify-content:center;width:40px}.bar--plant:before{content:"🌻";font-size:1.7rem;line-height:1;position:absolute;bottom:100%;left:50%;transform:translate(-50%)}.bar--plant .bar__stem{background:#3aa65b;border:3px solid #1b2a4a;border-radius:3px;width:12px}.choices--word{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}.choices--word .choice__label{text-align:center;font-size:1.7rem;font-weight:800}.choices--graphic{grid-template-columns:repeat(auto-fit,minmax(110px,1fr))}.choices--graphic .choice{min-height:120px;padding:12px 16px}.choices--graphic .choice__label{place-items:center;width:100%;display:grid}.choices--graphic .shape-svg{width:min(100%,96px)}.prompt--long{max-width:34ch;font-size:clamp(1.35rem,3.6vw,1.9rem);line-height:1.3}.sequence--numbers .sequence__item{font-size:calc(var(--item,56px) * .42);font-weight:900}.sequence--numbers .sequence__item--blank{font-size:calc(var(--item,56px) * .55)}.choices--text[data-count="2"],.choices--text[data-count="3"],.choices--symbol[data-count="2"],.choices--symbol[data-count="3"],.choices--graphic[data-count="2"],.choices--graphic[data-count="3"],.choices--graphic[data-count="4"]{grid-template-columns:repeat(var(--n), minmax(0, 1fr))}.choices--graphic.choices--bars-h{grid-template-columns:1fr}.choices--graphic.choices--bars-h .choice{min-height:72px}.choices--text[data-count="4"],.choices--symbol[data-count="4"],.choices--word[data-count="4"]{grid-template-columns:repeat(2,minmax(0,1fr))}@container (width>=420px){.choices--text[data-count="4"],.choices--symbol[data-count="4"]{grid-template-columns:repeat(4,minmax(0,1fr))}}@container (width>=680px){.choices--word[data-count="4"]{grid-template-columns:repeat(4,minmax(0,1fr))}}.choices--group[data-count="3"]{grid-template-columns:1fr}@container 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