:root{--game-accent:#2563eb;--game-accent-dark:#1e40af;--game-accent-soft:#dbeafe;--ink:#1f2430;--ink-soft:#4b5563;--paper:#fffdf7;--panel:#fff;--panel-border:#e5e0d5;--good:#1a9e54;--good-soft:#dcf5e6;--try-again:#e07b00;--try-again-soft:#fdeed3;--star:#f5b301;--radius:18px;--radius-small:12px;--shadow:0 4px 18px #1f24301a;--font:"Baloo 2", "Comic Sans MS", ui-rounded, system-ui, sans-serif;--tap-min:56px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:var(--font);background:var(--paper);color:var(--ink);-webkit-font-smoothing:antialiased}button{cursor:pointer;font-family:inherit}button:focus-visible,a:focus-visible{outline:3px solid var(--game-accent);outline-offset:2px}.topbar{justify-content:space-between;align-items:center;gap:8px;max-width:960px;margin:0 auto;padding:12px 16px;display:flex}.topbar-left{align-items:center;gap:10px;min-width:0;display:flex}.back-button{width:var(--tap-min);height:var(--tap-min);border:2px solid var(--panel-border);background:var(--panel);color:var(--game-accent-dark);box-shadow:var(--shadow);border-radius:50%;flex:none;justify-content:center;align-items:center;display:inline-flex}.back-button svg{width:26px;height:26px}.brand{color:var(--game-accent-dark);white-space:nowrap;min-width:0;font-size:1.5rem;font-weight:800}@media (width<=560px){.topbar{padding:10px 12px}.brand{font-size:1.08rem}}.settings-button{width:var(--tap-min);height:var(--tap-min);border:2px solid var(--panel-border);background:var(--panel);color:var(--game-accent-dark);box-shadow:var(--shadow);border-radius:50%;justify-content:center;align-items:center;display:inline-flex}.settings-button svg{width:28px;height:28px}.stars-svg{width:100%;max-width:8.25rem;height:auto;margin-inline:auto;display:block}.stars-svg--big{max-width:13.5rem}.stage{flex-direction:column;align-items:center;gap:16px;max-width:960px;margin:0 auto;padding:8px 16px 24px;display:flex}.panel{background:var(--panel);border:2px solid var(--panel-border);border-radius:var(--radius);box-shadow:var(--shadow);width:100%;padding:20px}.big-button{min-height:var(--tap-min);background:var(--game-accent);color:#fff;box-shadow:var(--shadow);border:none;border-radius:999px;padding:12px 28px;font-size:1.25rem;font-weight:800}.big-button.secondary{background:var(--panel);color:var(--game-accent-dark);border:2px solid var(--game-accent)}.choice-button{border:3px solid var(--game-accent);border-radius:var(--radius-small);background:var(--panel);min-width:72px;min-height:64px;color:var(--ink);padding:10px 18px;font-size:1.75rem;font-weight:800}.choice-button.correct{background:var(--good-soft);border-color:var(--good)}.choice-button.wrong{background:var(--try-again-soft);border-color:var(--try-again);animation:.3s shake}@keyframes shake{25%{transform:translate(-5px)}75%{transform:translate(5px)}}.feedback{text-align:center;min-height:2rem;font-size:1.25rem;font-weight:700}.feedback.good{color:var(--good)}.feedback.try{color:var(--try-again)}.settings-overlay{z-index:50;background:#1f243073;justify-content:flex-end;align-items:flex-start;display:none;position:fixed;inset:0}.settings-overlay.open{display:flex}.settings-panel{background:var(--panel);width:min(360px,92vw);height:100%;padding:20px;overflow-y:auto}.setting-row{border-bottom:1px solid var(--panel-border);justify-content:space-between;align-items:center;gap:12px;padding:14px 0;font-size:1.125rem;font-weight:700;display:flex}.toggle{flex:none;width:60px;height:34px;position:relative}.toggle input{opacity:0;cursor:pointer;width:100%;height:100%;margin:0;position:absolute}.toggle .track{pointer-events:none;background:#cbd5e1;border-radius:999px;transition:background .15s;position:absolute;inset:0}.toggle .track:after{content:"";background:#fff;border-radius:50%;width:28px;height:28px;transition:transform .15s;position:absolute;top:3px;left:3px}.toggle input:checked+.track{background:var(--good)}.toggle input:checked+.track:after{transform:translate(26px)}.toggle input:focus-visible+.track{outline:3px solid var(--game-accent);outline-offset:2px}.footer a{color:inherit}.footer{text-align:center;color:var(--ink-soft);padding:16px;font-size:.85rem}@media (prefers-reduced-motion:reduce){.choice-button.wrong{animation:none}}:root{--game-accent:#ea580c;--game-accent-dark:#9a3412;--game-accent-soft:#ffedd5;--block:#fb923c;--block-line:#9a3412;--block-one:#fdba74}.game-title{text-align:center;color:var(--game-accent-dark);white-space:nowrap;margin:0 0 8px;font-size:2rem}.intro-panel{text-align:center}.intro-text{margin:6px 0;font-size:1.15rem}.panel-title{color:var(--game-accent-dark);margin:0 0 12px;font-size:1.3rem}.rung-button{border:3px solid var(--game-accent);border-radius:var(--radius-small);background:var(--panel);width:100%;min-height:72px;color:var(--ink);text-align:left;justify-content:space-between;align-items:center;gap:12px;margin:8px 0;padding:12px 16px;display:flex}.rung-button:disabled{border-color:var(--panel-border);color:var(--ink-soft);cursor:default;opacity:.65}.rung-text{flex-direction:column;gap:2px;display:flex}.rung-name{font-size:1.2rem;font-weight:800}.rung-blurb{color:var(--ink-soft);font-size:.95rem;font-weight:600}.rung-button{min-width:0;overflow:visible}.rung-stars{flex:0 8.25rem;min-width:0;display:block}.rung-stars .stars-svg{width:100%;min-width:0;max-width:8.25rem;display:block}.sum-panel{text-align:center}.sum-meta{color:var(--ink-soft);font-size:.95rem;font-weight:700}.sum-equation{white-space:nowrap;margin:4px 0;font-size:2.6rem;font-weight:800}.hint{background:var(--game-accent-soft);border-radius:999px;margin:4px 0;padding:4px 16px;font-weight:700;display:inline-block}.instruction{margin:6px 0 0;font-size:1.2rem;font-weight:700}.trays{flex-wrap:wrap;gap:16px;display:flex}.tray{border:2px solid var(--panel-border);border-radius:var(--radius-small);background:#fffaf2;flex:300px;padding:12px}.tray-done{border-color:var(--good);background:var(--good-soft)}.tray-head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:8px;margin-bottom:8px;display:flex}.tray-title{font-size:1.05rem;font-weight:800}.tray-value{color:var(--ink-soft);font-weight:700}.blocks{border:2px dashed var(--game-accent);border-radius:var(--radius-small);background:var(--panel);flex-wrap:wrap;align-content:flex-start;gap:6px;min-height:148px;padding:10px;display:flex}.blocks-empty{color:var(--ink-soft);align-self:center;margin:0 auto;font-weight:700}.block{border:2px solid var(--block-line);flex:none;padding:0}button.block{cursor:pointer}.block-ten{background:repeating-linear-gradient(to bottom, var(--block) 0, var(--block) 8.6px, var(--block-line) 8.6px, var(--block-line) 10px);border-radius:6px;width:30px;height:100px}.block-one{background:var(--block-one);border-radius:6px;width:30px;height:30px}.tray-controls{gap:12px;margin-top:12px;display:flex}.add-button{flex:1}.big-button:disabled{opacity:.45;cursor:default}.action-row{flex-wrap:wrap;justify-content:center;gap:12px;margin-top:16px;display:flex}.combine-blocks{justify-content:center;display:flex}.combine-blocks svg{max-width:100%;height:auto}.combine-blocks.bundling{animation:.6s bundle-pulse}@keyframes bundle-pulse{0%{transform:scale(1)}40%{transform:scale(1.1)rotate(1.5deg)}to{transform:scale(1)}}.combine-text{text-align:center;margin:8px 0;font-size:1.15rem;font-weight:700}.combine-blocks+.combine-text{margin-top:12px}.panel .big-button{margin:10px auto 0;display:block}.panel .action-row .big-button{margin:0;display:inline-block}.hops{flex-wrap:wrap;justify-content:center;align-items:center;gap:4px;margin-top:14px;font-weight:800;display:flex}.hops-label{color:var(--game-accent-dark);margin-right:4px}.hop-num{background:var(--game-accent-soft);border-radius:8px;padding:2px 8px}.hop-step{color:var(--game-accent-dark);font-size:.9rem}.muted{color:var(--ink-soft);text-align:center;margin:8px 0;font-weight:600}.choices{flex-wrap:wrap;justify-content:center;gap:14px;display:flex}.answer-total{text-align:center;white-space:nowrap;font-size:1.8rem;font-weight:800}.round-done{text-align:center;position:relative}.big-stars{width:100%}#stage{position:relative;overflow-x:clip}.burst-bit{pointer-events:none;z-index:5;border-radius:3px;width:12px;height:12px;animation:.9s ease-out forwards burst-fly;position:absolute;top:120px;left:50%}@keyframes burst-fly{to{transform:translate(var(--dx), var(--dy)) rotate(220deg);opacity:0}}@media (prefers-reduced-motion:reduce){.combine-blocks.bundling,.burst-bit{animation:none}}@media (width<=480px){.sum-equation{font-size:2.1rem}.game-title{font-size:1.6rem}}