@font-face{font-family:Figtree;src:url('./assets/fonts/Figtree-Latin.woff2') format('woff2');font-weight:300 900;font-style:normal;font-display:swap}
:root{--page:#f3f3ef;--field:#fff;--ink:#20211f;--muted:#62645e;--line:#d6d8cf;--accent:#cb452e;--green:#2f7150;font-family:Figtree,system-ui,sans-serif;color:var(--ink);background:var(--page);font-synthesis:none;scroll-behavior:smooth;scrollbar-color:#acafa4 var(--page)}
*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button{cursor:pointer;color:inherit}a{color:inherit;text-underline-offset:4px}button:disabled{cursor:default;opacity:.4}button:focus-visible,a:focus-visible,summary:focus-visible,canvas:focus-visible{outline:2px solid var(--accent);outline-offset:5px}::selection{background:#dddccf;color:#171814}button{touch-action:manipulation}svg{display:block;width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}[hidden]{display:none!important}.shell{max-width:1180px;margin:auto;padding:0 32px}.skip{position:fixed;top:-100px;left:16px;z-index:10;background:var(--ink);color:white;padding:12px}.skip:focus{top:12px}.site-header{height:84px;display:flex;align-items:center;gap:52px;border-bottom:1px solid var(--line)}.brand{font-size:26px;font-weight:800;letter-spacing:-.035em;text-decoration:none;display:inline-flex;align-items:center;gap:12px}.brand svg{width:29px;height:29px;fill:currentColor;stroke-width:1}.site-header nav{display:flex;gap:26px;font-size:13px}.site-header nav a{text-decoration:none}.site-header nav a:hover{text-decoration:underline}.header-note{margin-left:auto;font-size:13px;color:var(--muted)}.intro{display:flex;align-items:center;justify-content:space-between;padding:29px 0 25px}.intro h1{font-size:clamp(36px,4.1vw,50px);font-weight:750;letter-spacing:-.04em;line-height:1.05;margin:0 0 11px}.title-dot{color:var(--accent)}.intro p{margin:0;font-size:15px;color:var(--muted)}.intro .edition{font-size:13px;line-height:1.65;text-align:right}.edition strong{color:var(--ink);font-weight:700}.edition span{font-size:12px}.game-field{background:var(--field);border:1px solid var(--line);border-radius:14px;overflow:hidden}.game-toolbar{height:63px;padding:0 27px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e8e9e2}.level-info{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:650;font-variant-numeric:tabular-nums}.divider,.level-total{font-size:13px;color:var(--muted);font-weight:400}.toolbar-actions{display:flex;align-items:center;gap:13px}.quiet,.icon-button{border:0;background:transparent;font-size:12px;padding:9px 10px;display:inline-flex;align-items:center;justify-content:center;gap:6px;border-radius:6px;min-height:36px}.quiet:hover,.icon-button:hover{background:#efefe9}.quiet svg{width:13px;height:13px}.icon-button{min-width:36px}.toolbar-actions .sound{border-left:1px solid var(--line);border-radius:0;padding-left:20px}.practice-label{color:var(--green);background:#eaf3ed;font-size:11px;padding:4px 7px;border-radius:4px;margin-left:5px}.arena-wrap{position:relative}.board-note{position:absolute;z-index:1;inset:20px 28px auto;display:flex;justify-content:space-between;align-items:center;pointer-events:none;font-size:12px;color:var(--muted)}#timer{font-size:18px;letter-spacing:-.02em;color:var(--ink);font-variant-numeric:tabular-nums}#timer span{font-size:12px;margin-left:2px;color:var(--muted)}#board{display:block;width:100%;height:clamp(410px,56vh,535px);touch-action:manipulation;cursor:crosshair}.result{position:absolute;left:50%;bottom:18px;transform:translateX(-50%);width:max-content;max-width:90%;background:white;text-align:center;padding:14px 22px 4px}.result>p:first-child{font-size:20px;font-weight:650;margin:0 0 4px;letter-spacing:-.02em}.result-text{font-size:12px;color:var(--muted);margin:0 0 12px}.primary{border:1px solid var(--ink);background:var(--ink);color:white;padding:11px 22px;border-radius:7px;font-size:13px;font-weight:600;min-height:42px;display:inline-flex;align-items:center;gap:28px;justify-content:center}.primary:hover{background:#3c3e37}.primary span{font-size:20px;font-weight:400}.play-controls{height:61px;margin:0 27px;border-top:1px solid #e8e9e2;display:flex;align-items:center;justify-content:space-between;gap:10px}.remaining{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:6px;min-width:92px}.remaining strong{font-size:19px;font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums}.launch{display:flex;gap:12px;align-items:center;justify-content:center;font-size:13px;border:0;background:none;min-height:44px;padding:8px 14px;border-radius:6px;font-weight:600}.launch:hover{background:#f0f1eb}kbd{font:10px Figtree,sans-serif;letter-spacing:.03em;border:1px solid var(--line);border-radius:4px;padding:4px 6px;color:var(--muted);background:#fafaf7}.text-button{border:0;background:transparent;padding:6px 0;font-size:12px;display:inline-flex;gap:7px;align-items:center;min-height:32px;text-decoration:underline;text-decoration-color:#bcc0b4;text-underline-offset:4px}.text-button:hover{text-decoration-color:currentColor}.text-button svg{width:16px;height:16px}.records{display:flex;gap:34px;padding:17px 27px;background:#f8f9f5;border-top:1px solid #e8e9e2;font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}.records strong{font-size:12px;font-weight:600;color:var(--ink);margin-left:8px}.records .cleared{display:flex;gap:5px;margin-left:auto}.records .cleared strong{margin:0}.below-game{display:flex;align-items:center;justify-content:space-between;padding:17px 2px 0;font-size:11px;color:var(--muted)}.below-game p{margin:0;font-size:13px}.between{margin:0 9px;color:#b2b6a9}.how,.faq{display:grid;grid-template-columns:1fr 1.5fr;gap:60px;padding:54px 0;border-bottom:1px solid var(--line)}.how{margin-top:33px;border-top:1px solid var(--line)}h2{font-size:27px;line-height:1.2;letter-spacing:-.03em;font-weight:650;margin:0}.how p{font-size:15px;line-height:1.75;margin:0 0 16px;color:#52554d;max-width:70ch}.article-link{display:inline-flex;gap:24px;margin-top:6px;font-size:13px;font-weight:600}.faq details{border-bottom:1px solid var(--line);padding:16px 0}.faq details:first-child{padding-top:0}.faq details:last-child{border:0}.faq summary{font-size:14px;cursor:pointer;line-height:1.5}.faq details p{font-size:13px;line-height:1.8;color:var(--muted);max-width:70ch}.site-footer{display:flex;align-items:center;gap:24px;padding:30px 0;font-size:11px;color:var(--muted)}.brand.small{font-size:20px;color:var(--ink)}.site-footer>span{margin-right:auto}.privacy{padding:12px 0 40px;max-width:760px}.privacy h2{font-size:14px;letter-spacing:0}.privacy p{font-size:11px;line-height:1.9;color:var(--muted)}.privacy .text-button{font-size:11px}dialog{border:1px solid var(--line);border-radius:14px;padding:28px;max-width:min(640px,calc(100% - 28px));max-height:85dvh;color:var(--ink);background:#fff;overflow:auto}dialog::backdrop{background:#20211f70}dialog h2{font-size:24px}dialog p{font-size:13px;line-height:1.6;color:var(--muted)}.dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:25px}.mode-options{display:flex;gap:8px;margin:24px 0 15px}.mode-options button{border:1px solid var(--line);background:white;min-height:42px;padding:9px 16px;border-radius:6px;font-size:13px}.mode-options button[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:white}.mode-options button span{font-size:11px;margin-left:6px}.level-legend{font-size:11px}.level-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:6px;margin-top:18px}.level-grid button{position:relative;border:1px solid var(--line);background:#f9faf6;min-width:38px;min-height:42px;border-radius:5px;font-variant-numeric:tabular-nums;font-size:12px}.level-grid button:hover{background:#eceee5}.level-grid button[aria-pressed=true]{background:var(--ink);color:white;border-color:var(--ink)}.level-grid button.done:after{content:'';position:absolute;width:3px;height:3px;border-radius:50%;bottom:4px;left:calc(50% - 1.5px);background:var(--green)}.level-grid button.done[aria-pressed=true]:after{background:white}.legacy-note{border-top:1px solid var(--line);padding-top:12px}dialog form{display:flex;justify-content:flex-end;gap:12px;margin-top:24px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.guide{max-width:820px;margin:38px auto 65px}.back-link{font-size:12px}.guide h1{font-size:clamp(30px,4vw,45px);line-height:1.13;letter-spacing:-.035em;margin:25px 0}.guide-intro{font-size:18px!important}.guide section{margin-top:40px}.guide h2{font-size:25px;margin-bottom:17px}.guide p,.guide li{font-size:15px;line-height:1.8;color:#52554d;max-width:72ch}.guide li{margin:8px 0}.guide .primary{color:white;text-decoration:none;margin-top:24px}.guide-table{overflow:auto;border:1px solid var(--line);border-radius:8px;margin-top:22px;max-height:650px}.guide table{border-collapse:collapse;width:100%;text-align:left;font-size:12px;min-width:490px;font-variant-numeric:tabular-nums}.guide th,.guide td{padding:12px 15px;border-bottom:1px solid var(--line)}.guide thead th{position:sticky;top:0;background:#eaece3;font-weight:600}.guide tbody th{font-weight:600}.guide tbody tr:nth-child(even){background:#f9faf5}
@media(min-width:701px){#board{height:clamp(360px,50vh,470px)}}
@media(max-width:700px){.shell{padding:0 18px}.site-header{height:66px;gap:20px}.brand{font-size:23px;gap:9px}.brand svg{width:24px;height:24px}.site-header nav{gap:17px;margin-left:auto;font-size:12px}.site-header nav a:first-child,.header-note{display:none}.intro{padding:23px 0 21px;gap:15px}.intro h1{font-size:39px;margin-bottom:8px}.intro p{font-size:12px}.intro .edition{font-size:12px}.edition span{display:none}.game-toolbar{height:55px;padding:0 14px}.level-info{font-size:15px;gap:7px}.level-total,.divider{font-size:11px}.toolbar-actions{gap:3px}.quiet{font-size:11px;padding:7px}.toolbar-actions .sound{padding-left:9px;margin-left:2px}.icon-button{padding:7px;min-width:34px}.board-note{inset:17px 17px auto;font-size:10px}#timer{font-size:15px}#board{height:clamp(350px,51dvh,440px)}.play-controls{margin:0 15px;height:57px}.remaining{font-size:11px;min-width:75px;gap:4px}.remaining strong{font-size:17px}.launch{font-size:12px;padding:8px 4px}.launch kbd{display:none}.text-button{font-size:11px}.records{padding:14px 15px;gap:16px;flex-wrap:wrap;font-size:10px}.records strong{font-size:11px;margin-left:4px}.records .cleared{gap:4px}.below-game{padding-top:14px}.below-game p{font-size:11px}.below-game>span{display:none}.how,.faq{display:block;padding:30px 0}.how{margin-top:28px}h2{font-size:24px;margin-bottom:20px}.how p{font-size:14px}.faq summary{font-size:13px}.site-footer{gap:14px;flex-wrap:wrap;padding:26px 0 16px}.site-footer>span{display:none}.site-footer a:nth-last-child(2){margin-left:auto}.privacy{padding-bottom:24px}.privacy h2{margin-bottom:10px}.level-grid{grid-template-columns:repeat(6,1fr)}.levels-dialog{width:calc(100% - 24px);padding:20px}.dialog-heading h2{font-size:21px;margin:0}.level-grid button{min-width:35px}.result{bottom:14px;padding:12px 16px 0}.result>p:first-child{font-size:18px}.result-text{font-size:11px}.primary{min-height:42px;padding:10px 20px}}
@media(max-width:360px){.shell{padding:0 12px}.records{gap:10px}.records>span:nth-child(2){margin-left:auto}.records .cleared{width:100%;justify-content:flex-end}.level-info{gap:4px}.toolbar-actions .sound{border:0;padding-left:5px}.game-toolbar{padding:0 10px}.intro .edition{max-width:73px}.practice-label{font-size:9px;padding:3px}#board{height:350px}}
@media(max-height:540px) and (orientation:landscape){.intro{padding:15px 0}.site-header{height:54px}#board{height:350px}.game-toolbar{height:50px}}
/* Functional labels retain a legible floor on narrow screens. */
kbd{font-size:11px}.level-info,.toolbar-actions .sound{white-space:nowrap}.pattern-group{display:flex;align-items:center;gap:5px}.board-note .practice-label{margin:0}
@media(max-width:700px){.board-note,.records,.practice-label{font-size:11px}.toolbar-actions button{min-height:40px}.level-grid button{min-height:44px}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}