*,*:before,*:after{box-sizing:border-box}:root{--eq-ink: #172033;--eq-sky: #e8f8ff;--eq-brick: #c94908;--eq-brick-dark: #9b3304;--eq-gold: #ffc84a;--eq-danger: #ff5d2f;--eq-green: #2eb67d}body{margin:0;min-height:100dvh;color:var(--eq-ink);background:var(--eq-sky);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}[hidden]{display:none!important}.equation-builder-shell{--game-shell-pad-top: 0;--game-shell-pad-bottom: max(6px, calc(env(safe-area-inset-bottom, 0px) + 6px) );--game-shell-pad-inline: 0;--game-shell-gap: 0}.eq-top{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;width:100%;padding:8px 10px;background:#fff;border-bottom:2px solid rgba(23,32,51,.1)}.eq-home,.eq-stat,.eq-primary,.eq-pad{min-height:38px;display:inline-flex;align-items:center;justify-content:center;border-radius:10px;border:2px solid rgba(23,32,51,.14);padding:0 14px;font:inherit;font-weight:900;text-decoration:none}.eq-home,.eq-stat{color:var(--eq-ink);background:#f6fbff}.eq-primary,.eq-pad{color:#fff;background:var(--eq-green);box-shadow:0 4px #178052;cursor:pointer}.eq-secondary-action{margin:0 auto 10px;color:var(--eq-ink);background:#fff4d2;box-shadow:0 4px #d29a23}.eq-scene{position:relative;height:100%;min-height:0;overflow:hidden;background:radial-gradient(circle at 16% 18%,#fff 0 4%,transparent 4.3%),radial-gradient(circle at 20% 15%,#fff 0 5%,transparent 5.3%),radial-gradient(circle at 88% 20%,#fff 0 4%,transparent 4.3%),linear-gradient(180deg,#eefcff,#faffff 42%,#fff2ca)}.eq-start{position:relative;z-index:5;height:100%;display:grid;align-content:center;justify-items:center;gap:16px;padding:24px;text-align:center}.eq-start h1{margin:0;max-width:760px;font-size:clamp(2.4rem,8vw,5.4rem);line-height:.92}.eq-start p{max-width:560px;margin:0;font-size:clamp(1rem,2.7vw,1.35rem);font-weight:800}.eq-character-card{width:min(860px,100%);padding:clamp(14px,2.4vw,22px);border:3px solid rgba(23,32,51,.12);border-radius:24px;background:#ffffffe0;box-shadow:0 18px 42px #1720331f}.eq-character-card h2{margin:0;font-size:clamp(1.35rem,4vw,2.15rem);line-height:1}.eq-character-card p{max-width:none;margin-top:6px;color:#546179;font-size:clamp(.82rem,2vw,1rem)}.eq-character-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(92px,1fr));gap:10px;margin-top:14px}.eq-character-option{display:grid;justify-items:center;gap:6px;min-height:118px;padding:8px;border:2px solid rgba(23,32,51,.12);border-radius:18px;color:var(--eq-ink);background:#fffdf4;box-shadow:0 5px #17203314;font:inherit;font-weight:1000;cursor:pointer}.eq-character-option img{width:52px;height:78px;object-fit:contain;object-position:center bottom}.eq-character-option span{font-size:.82rem;line-height:1.05}.eq-character-option--selected{border-color:var(--eq-green);background:#e9fff4;box-shadow:0 5px #178052}.eq-character-option:disabled{color:#68758e;background:#eef2f7;box-shadow:none;cursor:not-allowed}.eq-character-option:disabled img{filter:grayscale(1);opacity:.42}.eq-game{height:100%;min-height:0;display:grid;grid-template-rows:auto auto minmax(0,1fr) auto;gap:8px;padding:8px clamp(8px,2vw,18px) 10px}.eq-problem,.eq-equation-tray{width:min(980px,100%);margin:0 auto;border:2px solid rgba(23,32,51,.1);border-radius:14px;background:#fffffff0;box-shadow:0 10px 24px #17203314;text-align:center}.eq-problem{padding:clamp(10px,1.8vw,18px);font-size:clamp(1rem,2.3vw,1.6rem);font-weight:900;line-height:1.28}.eq-problem p{margin:0}.eq-choice-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 18px;margin:8px 0 0;padding-left:1.5em;font-size:clamp(.9rem,1.8vw,1.1rem);line-height:1.15;text-align:left}.eq-equation-tray{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:start;gap:10px;padding:8px 12px}.eq-equation-label{color:#546179;font-size:.78rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}.eq-equation-tray strong{min-height:1.4em;font-size:clamp(1.05rem,2.7vw,1.7rem)}.eq-equation-main{display:grid;gap:2px}.eq-equation-main p{margin:0;color:#546179;font-size:clamp(.75rem,1.7vw,.95rem);font-weight:850}.eq-built-token{min-width:1.2em;margin:0 1px;padding:0 3px;border:0;border-radius:6px;color:var(--eq-ink);background:transparent;box-shadow:none;font:inherit;font-weight:1000;cursor:pointer}.eq-built-token:hover,.eq-built-token:focus-visible{background:#fff4d2;outline:none}.eq-built-token--selected{color:#123d2c;background:#fff4d2;box-shadow:inset 0 -2px #16885847}.eq-built-token-controls{display:inline-flex;gap:2px;margin:0 5px 0 2px;vertical-align:middle}.eq-built-token-action{min-width:1.55em;min-height:1.55em;padding:0 4px;border:1px solid rgba(22,136,88,.32);border-radius:999px;color:var(--eq-ink);background:#fffdf4;font:inherit;font-size:.72em;font-weight:1000;line-height:1;cursor:pointer}.eq-built-token-action:hover,.eq-built-token-action:focus-visible{border-color:var(--eq-green);outline:none}.eq-stage{position:relative;width:min(1120px,100%,calc((100dvh - 230px)*2.6));aspect-ratio:13 / 5;height:auto;min-height:280px;max-height:min(700px,calc(100dvh - 230px));margin:0 auto;overflow:hidden;border:3px solid rgba(23,32,51,.12);border-radius:18px;background:linear-gradient(180deg,rgba(255,255,255,.55),transparent 38%),linear-gradient(180deg,#c9f3ff,#eafff5 58%,#ffe29b);box-shadow:inset 0 -12px #ffffff61,0 18px 36px #1720331f}.eq-world{--eq-camera-x: 0%;--eq-world-width: 184.615%;--eq-frame-count: 2;position:absolute;inset:0 auto 0 0;width:var(--eq-world-width);height:100%;transform:translate(calc(var(--eq-camera-x) * -1));transition:transform .12s linear}.eq-chunk-art{position:absolute;inset:0;z-index:0;display:grid;grid-template-columns:repeat(var(--eq-frame-count),1fr)}.eq-chunk-art img{display:block;width:100%;height:100%;object-fit:fill}.eq-world--chunk-art .eq-cloud{display:none}.eq-cloud{position:absolute;width:13%;height:6%;border-radius:999px;background:#fff;opacity:.9;box-shadow:22px -10px 0 4px #fff,50px 1px 0 -2px #fff,0 7px #54b7d352}.eq-cloud--one{left:6%;top:10%}.eq-cloud--two{left:64%;top:16%}.eq-cloud--three{left:42%;top:7%}.eq-platform-layer,.eq-hazard-layer,.eq-coin-layer,.eq-token-layer{position:absolute;inset:0}.eq-hazard-layer,.eq-platform-layer{z-index:1}.eq-coin-layer{z-index:2}.eq-token-layer{z-index:3}.eq-ground,.eq-platform{position:absolute;border:2px solid #a73304;background:linear-gradient(135deg,rgba(255,255,255,.18) 0 18%,transparent 18%),repeating-linear-gradient(90deg,transparent 0 8%,rgba(95,26,3,.42) 8% 10%),var(--eq-brick);box-shadow:inset 0 -7px 0 var(--eq-brick-dark)}.eq-world--chunk-art .eq-ground,.eq-world--chunk-art .eq-platform{opacity:0}.eq-ground{border-radius:8px 8px 0 0}.eq-platform{border-radius:9px}.eq-token{position:absolute;z-index:3;display:grid;place-items:center;overflow:visible;border:2px solid #b43a05;border-radius:8px;color:#fff;background:linear-gradient(135deg,rgba(255,255,255,.18) 0 24%,transparent 24%),linear-gradient(315deg,rgba(0,0,0,.14) 0 28%,transparent 28%),#d94f09;font-size:clamp(1.1rem,3vw,2.2rem);font-weight:1000;line-height:1;box-shadow:inset 0 -5px #5f1a035c,0 7px #5f1a0347}.eq-world--chunk-art .eq-token{border:0;color:#1f2937;background:transparent;box-shadow:none;font-size:clamp(1.6rem,4vw,3.3rem);text-shadow:0 3px 0 #fff,0 -3px 0 #fff,3px 0 0 #fff,-3px 0 0 #fff,0 8px 18px rgba(23,32,51,.22)}.eq-world--choice-mode.eq-world--chunk-art .eq-token{border:0;color:#1f2937;background:transparent;font-size:clamp(1.8rem,5vw,3.8rem);box-shadow:none;text-shadow:0 3px 0 #fff,0 -3px 0 #fff,3px 0 0 #fff,-3px 0 0 #fff,0 8px 18px rgba(23,32,51,.22)}.eq-world--chunk-art .eq-token--bumped{color:#b3311d;background:#ffc84a38}.eq-token--hit{color:#7b4e09;background:var(--eq-gold);box-shadow:inset 0 -4px #c98712;opacity:.82}.eq-token--bumped{animation:eq-token-bump .65s ease-out;background:linear-gradient(135deg,rgba(255,255,255,.38) 0 24%,transparent 24%),linear-gradient(315deg,rgba(0,0,0,.12) 0 28%,transparent 28%),#ff8a1d;box-shadow:0 0 0 8px #ffc84a7a,0 0 24px #ff8a1dbf,inset 0 -5px #5f1a034d,0 9px #5f1a0338}.eq-token--wrong-choice:after{content:"×";position:absolute;inset:-18%;z-index:5;display:grid;place-items:center;color:#ef4444;font-size:2.2em;font-weight:1000;line-height:1;text-shadow:0 3px 0 #fff,0 -3px 0 #fff,3px 0 0 #fff,-3px 0 0 #fff,3px 3px 0 #fff,-3px -3px 0 #fff,0 0 18px rgba(239,68,68,.8);pointer-events:none}.eq-world--choice-mode .eq-token--wrong-choice:after{font-size:clamp(3.4rem,9vw,6.4rem)}.eq-token--correct-choice{animation:eq-correct-choice-glow .8s ease-in-out infinite alternate}.eq-coin{position:absolute;z-index:2;display:grid;place-items:center;border:3px solid #c98712;border-radius:999px;color:#fff8bf;background:radial-gradient(circle at 34% 28%,#fff9b4 0 15%,transparent 16%),linear-gradient(90deg,#f6ad2f 0 18%,#ffd84d 18% 82%,#c98616 82% 100%);box-shadow:inset 0 0 0 3px #fff9b480,0 0 0 3px #ffffffa6,0 6px 14px #5f1a0342;font-size:0;animation:eq-coin-spin 1.1s ease-in-out infinite alternate}.eq-coin:after{content:"";width:34%;height:56%;border-radius:999px;background:#ffffff80}.eq-coin--collected{display:none}.eq-player,.eq-enemy,.eq-door,.eq-fire{position:absolute;z-index:4;display:grid;place-items:center;-webkit-user-select:none;user-select:none;pointer-events:none}.eq-player,.eq-enemy{grid-template-rows:auto 1fr;align-items:end}.eq-sprite-label{align-self:start;padding:2px 7px;border-radius:999px;color:#fff;background:#172033c7;font-size:clamp(.58rem,1.25vw,.78rem);font-weight:1000;line-height:1.1;text-transform:uppercase;transform:translateY(-65%)}.eq-player .eq-sprite-label{background:#168858}.eq-enemy .eq-sprite-label{background:#b3311d}.eq-player{display:block;filter:drop-shadow(0 6px 0 rgba(23,32,51,.16));transition:transform .08s linear}.eq-player .eq-sprite-label{position:absolute;z-index:1;top:0;left:50%;transform:translate(-50%,-65%)}.eq-player-sprite{position:absolute;right:0;bottom:-16%;left:0;width:100%;height:118%;object-fit:contain;object-position:center bottom}.eq-player-sprite--left,.eq-player--left .eq-player-sprite--right{display:none}.eq-player--left .eq-player-sprite--left{display:block}.eq-player--hurt{animation:eq-blink .22s steps(2,start) infinite}.eq-enemy{display:block;filter:drop-shadow(0 6px 0 rgba(23,32,51,.16))}.eq-enemy-sprite{position:absolute;right:-18%;bottom:-18%;left:-18%;width:136%;height:136%;object-fit:contain;object-position:center bottom}.eq-enemy-sprite--left,.eq-enemy--left .eq-enemy-sprite--right{display:none}.eq-enemy--left .eq-enemy-sprite--left{display:block}.eq-door{z-index:3;align-items:end;filter:drop-shadow(0 8px 0 rgba(23,32,51,.18)) drop-shadow(0 0 18px rgba(255,200,74,.75));animation:eq-door-glow 1.1s ease-in-out infinite alternate}.eq-door img{position:absolute;inset:-18%;width:136%;height:136%;object-fit:contain;object-position:center bottom}.eq-door-bubble{position:absolute;left:50%;bottom:108%;z-index:2;width:clamp(120px,28vw,210px);padding:7px 9px;border:2px solid rgba(23,32,51,.14);border-radius:14px;color:var(--eq-ink);background:#fffdf4f7;box-shadow:0 8px #1720331f,0 14px 28px #17203329;font-size:clamp(.68rem,1.35vw,.86rem);font-weight:950;line-height:1.12;text-align:center;transform:translate(-50%)}.eq-door-bubble:after{content:"";position:absolute;left:50%;top:100%;width:12px;height:12px;border-right:2px solid rgba(23,32,51,.14);border-bottom:2px solid rgba(23,32,51,.14);background:#fffdf4f7;transform:translate(-50%,-50%) rotate(45deg)}.eq-door-bubble[hidden],.eq-door[hidden]{display:none}.eq-fire{align-items:end;overflow:hidden;font-size:clamp(2rem,5vw,4.6rem);background:linear-gradient(180deg,transparent 0 40%,rgba(255,93,47,.18))}.eq-world--chunk-art .eq-fire{display:none}.eq-message{min-height:40px;margin:0 auto;width:min(980px,100%);padding:8px 12px;border-radius:12px;background:#fffffff0;font-weight:900;text-align:center}.eq-win-modal,.eq-reset-modal{position:fixed;inset:0;z-index:20;display:grid;place-items:center;padding:10px;background:#1720336b}.eq-win-modal[hidden],.eq-reset-modal[hidden]{display:none}.eq-win-card{width:min(780px,100%);max-height:calc(100dvh - 20px);padding:clamp(14px,2.4vw,24px);border:4px solid #b8d4a9;border-radius:28px;background:#fffdf4;box-shadow:0 24px 60px #17203347;text-align:center}.eq-win-kicker{margin:0 0 4px;color:var(--eq-green);font-size:.8rem;font-weight:1000;letter-spacing:.1em;text-transform:uppercase}.eq-win-card h2{margin:0;font-size:clamp(1.9rem,6vw,3.6rem);line-height:.95}.eq-win-card p:not(.eq-win-kicker){margin:8px 0 12px;font-size:1rem;font-weight:900}.eq-solve-panel{display:grid;gap:8px}.eq-solve-panel[hidden]{display:none}.eq-scratch-header{display:grid;grid-template-columns:1fr minmax(140px,.42fr);align-items:center;gap:10px;padding:6px 8px 8px}.eq-scratch-header strong{display:block;color:#1f2937;font-size:clamp(1.7rem,5.4vw,3rem);text-align:center}.eq-scratch-board{margin:0 0 8px;text-align:left}.eq-scratch-board .sz-scratch-body{grid-template-columns:minmax(4.25rem,.12fr) minmax(16rem,1fr);min-height:min(38vh,18rem)}.eq-scratch-board .sz-scratch-canvas-wrap,.eq-scratch-board .sz-scratch-canvas{min-height:min(32vh,15rem)}.eq-answer-label{display:grid;gap:4px;font-weight:1000;text-align:center}.eq-answer-label input{width:min(180px,100%);min-height:44px;justify-self:center;border:3px solid rgba(23,32,51,.2);border-radius:16px;color:var(--eq-ink);background:#fffdf4;font:inherit;font-size:1.65rem;font-weight:1000;text-align:center}.eq-answer-label input:focus{border-color:var(--eq-green);outline:4px solid rgba(46,182,125,.2)}.eq-win-card .eq-answer-feedback{min-height:1.4em;margin:0;color:#b3311d;text-align:center}@media(max-height:720px){.eq-top{gap:6px;padding:5px 8px}.eq-home,.eq-stat{min-height:30px;padding-inline:10px;font-size:.86rem}.eq-game{gap:5px;padding-block:5px 6px}.eq-problem{padding:7px 10px;font-size:clamp(.86rem,1.7vw,1.12rem);line-height:1.18}.eq-equation-tray{gap:6px;padding:5px 9px}.eq-equation-main p{display:none}.eq-stage{width:min(1120px,100%,calc((100dvh - 170px)*2.6));min-height:210px;max-height:min(700px,calc(100dvh - 170px))}.eq-message{min-height:32px;padding:6px 10px;font-size:.9rem}.eq-controls{padding:5px 8px}.eq-pad{min-height:44px}.eq-win-kicker{display:none}.eq-win-card h2{font-size:clamp(1.7rem,5vh,2.8rem)}.eq-scratch-board .sz-scratch-body{min-height:14rem}.eq-scratch-board .sz-scratch-canvas-wrap,.eq-scratch-board .sz-scratch-canvas{min-height:11.5rem}}.eq-inline-action{min-height:32px;margin-left:6px;padding-inline:12px}.eq-controls{display:flex;justify-content:center;gap:10px;padding:8px;background:#fffc}.eq-pad{width:clamp(62px,18vw,118px);min-height:54px;font-size:1.5rem;touch-action:none}.eq-pad--delete{color:var(--eq-ink);background:#fff4d2;box-shadow:0 4px #d29a23}@keyframes eq-blink{50%{opacity:.3}}@keyframes eq-door-glow{0%{transform:translateY(0) scale(1)}to{transform:translateY(-2%) scale(1.04)}}@keyframes eq-token-bump{0%{transform:translateY(0) scale(1)}35%{transform:translateY(-32%) scale(1.16)}62%{transform:translateY(10%) scale(1.06)}to{transform:translateY(0) scale(1)}}@keyframes eq-correct-choice-glow{0%{filter:drop-shadow(0 0 0 rgba(46,182,125,0))}to{filter:drop-shadow(0 0 14px rgba(46,182,125,.95)) drop-shadow(0 0 24px rgba(255,200,74,.8))}}@keyframes eq-coin-spin{0%{transform:translateY(0) scaleX(1)}to{transform:translateY(-8%) scaleX(.72)}}@media(max-width:720px){.eq-top{justify-content:flex-start}.eq-game{gap:6px;padding-inline:6px}.eq-stage{min-height:260px}.eq-equation-tray{grid-template-columns:1fr;gap:2px}}.sz-scratch-board{display:grid;gap:.55rem;width:100%}.sz-scratch-body{display:grid;grid-template-columns:minmax(4.5rem,.14fr) minmax(16rem,1fr);gap:.6rem;min-height:clamp(13rem,32vh,22rem)}.sz-scratch-tools{display:grid;align-content:start;gap:.45rem}.sz-scratch-tool{display:grid;place-items:center;min-height:3rem;border:0;border-radius:18px;padding:.42rem .32rem;color:#231305;background:#fffaf0e0;box-shadow:inset 0 0 0 2px #7c2d1229;font:inherit;font-weight:950;cursor:pointer}.sz-scratch-tool.is-selected{background:linear-gradient(135deg,#ffd166,#fb923c);box-shadow:inset 0 0 0 3px #7c2d122e,0 0 18px #ffd16657}.sz-scratch-shape-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.35rem}.sz-scratch-shape-tool{min-height:3rem;padding-inline:.25rem}.sz-scratch-shape-tool strong{font-size:1.35rem;line-height:1}.sz-scratch-canvas-wrap{position:relative;width:100%;min-height:13rem}.sz-scratch-canvas{width:100%;height:100%;min-height:13rem;border:0;border-radius:22px;background:#fffaf0;box-shadow:inset 0 0 0 3px #7c2d1224,0 12px 26px #23130524;cursor:crosshair;touch-action:none}.sz-scratch-shape-layer{position:absolute;inset:0;pointer-events:none}.sz-placed-shape{position:absolute;left:var(--shape-x);top:var(--shape-y);width:var(--shape-size);height:var(--shape-size);display:grid;place-items:center;border:0;padding:0;color:#241204;background:transparent;cursor:grab;pointer-events:auto;touch-action:none;transform:translate(-50%,-50%);will-change:transform,width,height}.sz-placed-shape:active{cursor:grabbing}.sz-placed-shape-icon{font-size:var(--shape-size);line-height:1;filter:drop-shadow(0 2px 0 rgba(255,209,102,.42))}.sz-placed-shape.is-rectangle .sz-placed-shape-icon{transform:scaleX(1.45)}.sz-shape-resize-handle{position:absolute;right:-.55rem;bottom:-.55rem;z-index:3;width:1.45rem;height:1.45rem;border-radius:.45rem 999px 999px;background:#ffd166;box-shadow:inset 0 0 0 3px #7c2d1247,0 4px 10px #00000038;cursor:nwse-resize;pointer-events:auto;touch-action:none}.sz-shape-resize-handle:before{content:"";position:absolute;right:.3rem;bottom:.3rem;width:.55rem;height:.55rem;border-right:3px solid rgba(36,18,4,.7);border-bottom:3px solid rgba(36,18,4,.7)}@media(max-width:720px){.sz-scratch-body{grid-template-columns:1fr;min-height:18rem}.sz-scratch-tools{grid-template-columns:repeat(4,minmax(0,1fr))}.sz-scratch-shape-grid{grid-column:1 / -1;grid-template-columns:repeat(5,minmax(0,1fr))}}