:root{color-scheme:dark;--bg:#171a19;--panel:#1e2220;--line:#343a35;--muted:#939d93;--text:#eef1e8;--lime:#d4ec91;--mono:"Cascadia Code","SFMono-Regular",Consolas,monospace;--sans:Inter,"Segoe UI",Arial,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.6 var(--sans)}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer}a{color:inherit;text-decoration:none}button:disabled{cursor:default;opacity:.4}button:focus-visible,a:focus-visible,canvas:focus-visible{outline:2px solid var(--lime);outline-offset:5px}button{transition:background .16s,border-color .16s,transform .16s}button:hover:not(:disabled){filter:brightness(1.08)}button:active:not(:disabled){transform:translateY(1px)}.wrap{width:min(1192px,calc(100% - 72px));margin:auto}.site-header{height:100px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:32px}.brand{display:grid;grid-template-columns:32px auto;column-gap:12px;line-height:1;font-size:22px;font-weight:850;letter-spacing:-.8px}.brand svg{width:32px;grid-row:span 2;color:var(--lime)}.brand span{font:8px var(--mono);letter-spacing:1.5px;margin-top:8px}.site-header nav{display:flex;gap:30px;font-size:13px}.site-header nav a{color:#b5beb4}.site-header nav a:hover{color:var(--lime)}.header-note{font:10px var(--mono);color:#adb6aa;white-space:nowrap}.header-note i,.session-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--lime);margin-right:8px}.intro{display:flex;align-items:center;justify-content:space-between;padding:43px 0 38px;gap:30px}.eyebrow,.label{font:10px/1.4 var(--mono);letter-spacing:1.55px;color:var(--muted);margin:0}.intro .eyebrow{color:var(--lime);margin-bottom:12px}.intro h1{font-size:clamp(32px,4vw,52px);line-height:1.15;letter-spacing:-2px;margin:0;font-weight:580}.intro h1 span{color:var(--lime)}.intro>p{font-size:13px;color:#a6afa4;line-height:1.8;margin:0}.arcade{display:grid;grid-template-columns:minmax(200px,1fr) 302px minmax(160px,.8fr);gap:56px;padding:32px 54px 26px;background:var(--panel);border:1px solid var(--line);border-radius:18px;position:relative}.section-top{display:flex;align-items:center;justify-content:space-between}.section-top .session-dot{background:#7d897c;margin:0}.session-dot.active{background:var(--lime)}.score{margin-top:25px}.score .label,.stat-pair .label{display:block}.score strong{display:block;font:46px/1.3 var(--mono);letter-spacing:-3px;margin-top:2px}.stat-pair{display:grid;grid-template-columns:1.4fr 1fr;gap:12px;border-bottom:1px solid var(--line);padding:15px 0 20px}.stat-pair strong{display:block;font:22px/1.3 var(--mono);margin-top:6px}.tiny{font-size:7px;letter-spacing:1px;color:#738070}.level-row{display:flex;justify-content:space-between;margin-top:20px;font:9px var(--mono);color:var(--muted)}.level-row b{color:var(--text);font-weight:400}.progress{height:3px;background:#343c32;margin-top:10px;overflow:hidden}.progress div{height:100%;width:0;background:var(--lime);transition:width .2s}.difficulty{margin-top:29px}.difficulty-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}.difficulty-grid button{position:relative;text-align:left;border:1px solid #3a4239;background:transparent;border-radius:7px;padding:10px 8px 10px 12px;font-size:12px;line-height:1.5}.difficulty-grid button>span{font:8px var(--mono);color:#7a8976;position:absolute;right:8px;top:9px}.difficulty-grid small{display:block;font-size:8px;color:#879480;margin-top:1px;white-space:nowrap}.difficulty-grid button[aria-pressed=true]{background:var(--lime);border-color:var(--lime);color:#20291a}.difficulty-grid button[aria-pressed=true] small,.difficulty-grid button[aria-pressed=true]>span{color:#53673b}.demo-button{margin-top:26px;background:transparent;border:0;border-top:1px solid var(--line);width:100%;padding:17px 0 0;display:flex;text-align:left;align-items:center;gap:10px;font-size:11px}.play-icon{font-size:24px;color:var(--lime)}.demo-button>span:last-child{margin-left:auto;color:var(--lime);font-size:17px}.demo-button small{display:block;font-size:8px;color:var(--muted);margin-top:3px}.local-note{font-size:9px;color:#7f8c7c;margin:16px 0 0}.board-toolbar{height:25px;display:flex;align-items:flex-start;justify-content:space-between;font:8px var(--mono);letter-spacing:1.25px;color:#c6d5bb}.board-toolbar #status{display:flex;align-items:center;gap:7px;padding-top:2px}.board-toolbar #status i{width:5px;height:5px;background:var(--lime);border-radius:50%}.icon-button{padding:0 2px;line-height:1;font:17px var(--mono);background:none;border:0;color:var(--lime)}.board-frame{position:relative;border:1px solid #455041;border-radius:7px;overflow:hidden;background:#111613;box-shadow:0 12px 30px #080e0b35}#board{width:300px;height:600px;max-width:100%;display:block;touch-action:manipulation}.board-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;background:#121813be;backdrop-filter:blur(3px);text-align:center}.board-overlay[hidden]{display:none}.board-overlay .eyebrow{color:var(--lime);font-size:8px;letter-spacing:2px}.board-overlay h2{font-size:42px;font-weight:520;letter-spacing:-1.5px;line-height:1.08;margin:18px 0 12px}.board-overlay p{font-size:12px;color:#a2af9c;margin:0 16px 24px}.primary{display:flex;justify-content:space-between;align-items:center;gap:22px;background:var(--lime);color:#20291a;border:1px solid var(--lime);border-radius:6px;padding:12px 20px;font-size:12px;font-weight:650;min-width:176px}.primary>span{font-size:20px;font-weight:400;line-height:1}#overlay-hint{margin-top:20px;font:7px var(--mono);letter-spacing:1.1px;color:#85907e}.board-footer{display:flex;justify-content:space-between;align-items:center;gap:8px;padding-top:10px;color:#8d9a86;font-size:8px}.board-footer>span{display:flex;align-items:center;gap:5px}.ghost-swatch{width:7px;height:7px;border:1px solid #7d8c72}.board-footer button{font-size:10px;padding:0;background:transparent;border:0;color:#adbca3}.board-footer button span{font-size:8px}.clear-toast{position:absolute;left:50%;top:42%;transform:translate(-50%,10px);background:var(--lime);color:#1a2714;border-radius:5px;font:12px var(--mono);padding:10px 16px;opacity:0;transition:.25s;pointer-events:none;white-space:nowrap}.clear-toast.visible{opacity:1;transform:translate(-50%,-8px)}.right-panel{padding-top:0}.right-panel .label{display:flex;align-items:center;justify-content:space-between}.right-panel .label span{font-size:8px;color:#677662}.next-list{border:1px solid var(--line);border-radius:7px;margin-top:14px;overflow:hidden}.next-list 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6px;font-size:7px}.touch-controls{display:none}.how-to{padding:72px 0 62px;border-bottom:1px solid var(--line)}.section-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:24px}.section-heading .eyebrow{padding-top:9px;font-size:9px}.section-heading h2{font-weight:450;font-size:28px;line-height:1.3;letter-spacing:-.7px;margin:0}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;margin-top:34px}.steps article{position:relative;border-top:1px solid var(--line);padding-top:22px}.step-number{font:10px var(--mono);color:#87927f}.step-art{height:45px;position:relative;margin-top:17px}.step-art i{position:absolute;width:18px;height:18px;border:1px solid #a2b48f;border-radius:2px;background:#a2b48f22}.art-stack i:nth-child(1){left:0;top:20px}.art-stack i:nth-child(2){left:20px;top:20px}.art-stack i:nth-child(3){left:40px;top:20px}.art-stack i:nth-child(4){left:20px;top:0}.art-clear i{top:20px;background:#d4ec91;border-color:#d4ec91}.art-clear i:nth-child(2){left:20px}.art-clear i:nth-child(3){left:40px}.art-clear i:nth-child(4){left:60px}.art-clear i:nth-child(5){left:80px}.art-clear i:nth-child(6){left:100px;opacity:.25}.art-flow i{border-color:#ad9be8;background:#ad9be833}.art-flow i:nth-child(1){left:0;top:0}.art-flow i:nth-child(2){left:0;top:20px}.art-flow i:nth-child(3){left:20px;top:20px}.art-flow i:nth-child(4){left:40px;top:20px}.steps h3{font-weight:500;font-size:18px;letter-spacing:-.3px;margin:20px 0 8px}.steps p{color:var(--muted);font-size:12px;line-height:1.85;margin:0;max-width:295px}.about{padding:59px 0 64px;display:grid;grid-template-columns:1fr 1fr;gap:100px}.about h2{font-weight:450;font-size:39px;letter-spacing:-1.3px;line-height:1.2;margin:15px 0 0}.about>div>p:not(.eyebrow){font-size:14px;color:#b4bdb0;line-height:1.8;margin:0 0 17px}.about>div>.about-small{font-size:11px!important;color:#87927f!important}.about a{display:inline-flex;align-items:center;gap:48px;font-size:12px;margin-top:12px;border-bottom:1px solid var(--lime);color:var(--lime);padding-bottom:7px}footer{display:flex;justify-content:space-between;align-items:center;gap:20px;border-top:1px solid var(--line);padding:26px 0 32px!important;color:#75806e;font:8px var(--mono);letter-spacing:1px}.footer-brand{font:16px var(--sans);font-weight:800;letter-spacing:-.6px;color:#afbaa6}.footer-brand span{font-size:8px;vertical-align:top;margin-left:2px}dialog{background:#252d23;color:var(--text);border:1px solid #53614a;border-radius:14px;padding:30px;max-width:440px;width:calc(100% - 32px);box-shadow:0 20px 90px #0008}dialog::backdrop{background:#101710cc;backdrop-filter:blur(5px)}dialog h2{font-weight:500;letter-spacing:-.6px;font-size:28px;margin:17px 0 10px}dialog p{font-size:12px;color:#b0bea5;margin-bottom:28px}dialog form>div{display:flex;gap:10px}dialog button{font-size:11px;min-width:0;flex:1;padding:11px;justify-content:center}.secondary{border:1px solid #56654d;border-radius:6px;background:none}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.noscript{text-align:center;color:var(--lime)}
@media(min-width:1100px){.arcade{grid-template-columns:230px 302px 174px;justify-content:center;gap:65px}#board{height:540px}.board-frame{height:542px}}
@media(max-width:1000px){.wrap{width:calc(100% - 48px)}.header-note{display:none}.arcade{padding:26px;gap:26px;grid-template-columns:minmax(176px,1fr) 262px 150px}#board{width:260px;height:520px}.score strong{font-size:37px}.difficulty-grid button{padding-left:8px}.difficulty-grid small{font-size:7px}.difficulty-grid button>span{display:none}.intro h1{font-size:38px}.intro>p{font-size:11px}.next-list canvas{height:62px}.hold-section>canvas{height:62px}.how-to{padding-top:54px}.section-heading{flex-direction:column;gap:10px}}
@media(max-width:760px){.wrap{width:calc(100% - 32px)}.site-header{height:76px;gap:12px}.brand{font-size:18px;column-gap:8px;grid-template-columns:25px auto}.brand svg{width:25px}.brand span{font-size:6px;letter-spacing:1.1px;margin-top:6px}.site-header nav{gap:17px;font-size:11px}.site-header nav a:last-child{display:none}.intro{padding:30px 0 25px;display:block}.intro h1{font-size:clamp(29px,6.4vw,43px);letter-spacing:-1.3px}.intro .eyebrow{font-size:8px}.intro>p{font-size:12px;margin-top:15px}.desktop-break{display:none}.arcade{grid-template-columns:minmax(0,1fr) 130px;padding:20px;gap:18px;max-width:480px;margin:auto}.left-panel{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.section-top{display:none}.score{margin-top:0}.score .label{font-size:8px}.score strong{font-size:32px;letter-spacing:-2px}.stat-pair{padding:0;border:0;gap:10px;align-items:center}.stat-pair .label{font-size:8px}.stat-pair strong{font-size:18px;margin-top:3px}.level-row,.progress{display:none}.difficulty{margin-top:18px;grid-column:1/-1}.difficulty h2{font-size:8px}.difficulty-grid{grid-template-columns:repeat(4,1fr);margin-top:8px;gap:6px}.difficulty-grid button{text-align:center;font-size:11px;padding:8px 0}.difficulty-grid small{display:none}.demo-button{grid-column:1/-1;margin-top:12px;padding-top:8px;font-size:10px}.demo-button small,.local-note{display:none}.play-icon{font-size:18px}.game-column{min-width:0}#board{width:100%;height:auto;aspect-ratio:1/2}.board-toolbar{font-size:6px;letter-spacing:.7px;height:23px}.board-overlay h2{font-size:32px}.board-overlay .eyebrow{font-size:6px}.board-overlay p{font-size:10px;margin-bottom:16px}.board-overlay .primary{min-width:135px;padding:10px 12px;font-size:10px}#overlay-hint{font-size:5px;margin-top:12px}.board-footer{font-size:6px}.board-footer>span{max-width:125px;line-height:1.5}.board-footer button span{display:none}.right-panel{padding-top:23px}.right-panel .label{font-size:8px;letter-spacing:1px}.next-list{margin-top:9px}.next-list canvas{height:58px}.hold-section{margin-top:18px}.hold-section>canvas{height:58px}.hold-section>p{font-size:8px}.keyboard-guide{display:none}.touch-controls{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-top:16px}.touch-controls button{touch-action:none;user-select:none;-webkit-user-select:none;background:#2c3529;border:1px solid #46553e;border-radius:5px;height:40px;font:15px var(--mono);color:#d6e6ca}.touch-controls button:nth-child(1),.touch-controls button:nth-child(3){font-size:8px;letter-spacing:.5px}.touch-controls button:nth-child(3){background:#d4ec91;color:#20291a}.how-to{padding:45px 0}.section-heading h2{font-size:25px}.section-heading .eyebrow{font-size:8px}.steps{grid-template-columns:1fr;gap:28px;margin-top:25px}.steps article{padding-left:56px;padding-top:18px}.step-number{position:absolute;left:0;top:25px}.step-art{display:none}.steps h3{margin:0 0 6px;font-size:17px}.steps p{max-width:none;font-size:12px}.about{grid-template-columns:1fr;gap:25px;padding:40px 0}.about h2{font-size:33px}.about>div>p:not(.eyebrow){font-size:12px}footer{flex-wrap:wrap;gap:16px;padding-bottom:24px!important}footer>span:last-child{display:none}.clear-toast{font-size:9px;padding:8px}}
@media(max-width:400px){.site-header nav{gap:11px;font-size:10px}.brand{font-size:16px}.arcade{padding:14px;gap:12px;grid-template-columns:minmax(0,1fr) 94px}.right-panel .label span{font-size:6px}.board-overlay h2{font-size:28px}.board-overlay .primary{min-width:116px}.next-list canvas,.hold-section>canvas{height:52px}.board-footer>span{max-width:115px}.score strong{font-size:29px}.tiny{font-size:6px}.intro h1{font-size:28px}.board-overlay p{margin-left:6px;margin-right:6px}.right-panel .label{font-size:7px}}
#board:focus-visible{outline-offset:-3px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}