:root{color-scheme:light;--ink:#183b3b;--muted:#496363;--paper:#fffdf6;--ground:#e7efed;--line:#9cafaa;--accent:#bfeda6;--focus:#753d77;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--ground)}*{box-sizing:border-box}body{margin:0}button,input{font:inherit;color:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button{min-height:44px;border:1px solid var(--line);border-radius:7px;background:var(--paper);padding:.6rem .9rem;font-weight:650;cursor:pointer}button:hover:not(:disabled){border-color:var(--ink);background:#f0f8e9}button:disabled{cursor:default;color:#586b67;background:#e8eeea}a{color:var(--ink);text-underline-offset:4px}a:hover{color:var(--focus)}:focus-visible{outline:3px solid var(--focus);outline-offset:3px}.skip{position:absolute;top:-80px;left:16px;background:white;z-index:5;padding:12px}.skip:focus{top:10px}.site-header,main,footer{width:min(100% - 40px,1000px);margin-inline:auto}.site-header{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px 0}.brand{display:flex;align-items:center;gap:9px;font-size:1.24rem;font-weight:750;text-decoration:none;letter-spacing:-.04em}.brand svg{width:27px;height:27px;stroke:currentColor;stroke-width:2;fill:var(--accent)}.heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:20px 0 24px}h1{font-size:clamp(1.8rem,4vw,2.8rem);line-height:1.1;letter-spacing:-.045em;margin:0 0 9px}p{line-height:1.6}.heading p{margin:0;color:var(--muted)}.modes{display:flex;gap:4px;padding:4px;border:1px solid var(--line);border-radius:10px;flex:none}.modes button{border:0;background:transparent}.modes button[aria-pressed=true]{background:var(--ink);color:white}.play-area{display:grid;grid-template-columns:minmax(0,1fr) minmax(275px,.88fr);gap:clamp(24px,5vw,65px);align-items:start}.paper{background:var(--paper);padding:20px;border:1px solid var(--line);box-shadow:5px 6px 0 #ccdad4}.paper-heading{display:flex;justify-content:space-between;gap:8px;font-size:.85rem;margin-bottom:16px}.board{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border:2px solid var(--ink);background:var(--ink);gap:2px}.board [role=row]{display:contents}.cell{width:100%;border:0;border-radius:0;aspect-ratio:1;padding:0;min-height:44px;position:relative;background:white}.cell .number{position:absolute;top:4px;left:6px;font-family:ui-monospace,monospace;font-size:clamp(.68rem,1.4vw,.82rem);font-weight:500}.cell .value{font-size:clamp(1.4rem,4.5vw,2rem);font-weight:600;display:block;margin-top:8px;line-height:1.3}.cell[data-given=true] .value{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:4px}.cell[data-shared=true]{background:#e1f6d5}.cell[aria-current=true]{background:var(--accent);box-shadow:inset 0 0 0 3px var(--ink)}.cell:focus-visible{outline-offset:-5px;outline-width:3px;z-index:1}.block{background:var(--ink);aspect-ratio:1}.board-help{font-size:.84rem;color:var(--muted);margin:15px 0}.actions{display:flex;gap:8px}.actions button{flex:1}.selected{padding:4px 0 14px;border-bottom:1px solid var(--line);margin-bottom:15px}.selected h2{font-size:1.35rem;margin:0}.selected p{margin:4px 0 0;color:var(--muted);font-size:.9rem}label{display:block;font-size:.85rem;margin-bottom:7px}.entry{display:flex;gap:7px;margin-bottom:18px}.entry input{min-width:0;width:65px;min-height:44px;border:1px solid var(--line);background:white;border-radius:6px;text-align:center;font-size:1.3rem;text-transform:uppercase}.entry button{flex:1}.letter-pad{display:grid;grid-template-columns:repeat(auto-fit,minmax(44px,1fr));gap:6px}.letter-pad button{padding:.45rem 0;font-size:1.12rem;min-width:44px}.letter-pad button[data-used=true]{background:#d3dfda;border-color:#9badA5;text-decoration:underline;text-underline-offset:4px}.feedback{min-height:3.2em;font-size:.92rem;margin:16px 0}.finish{margin-top:12px}.finish button{background:var(--ink);color:white;border-color:var(--ink)}[hidden]{display:none!important}.text-button{background:transparent;border-color:var(--ink)}.notice{border:1px solid #9f7446;border-left:4px solid #9f7446;background:#fff4df;padding:12px 16px;margin:0 0 20px}.notice p{margin:0 0 10px}.notice pre{white-space:pre-wrap;overflow-wrap:anywhere}.notice details{margin-top:12px}.quick-rules{margin:45px 0 24px;border-top:1px solid var(--line);padding-top:24px;max-width:720px}.quick-rules h2{font-size:1.5rem;letter-spacing:-.02em;margin:0 0 12px}.quick-rules p{margin:10px 0}.collection-note{font-size:.86rem;color:var(--muted);max-width:720px}footer{padding:25px 0 35px;display:flex;gap:24px;border-top:1px solid var(--line);margin-top:30px;font-size:.85rem}dialog{border:1px solid var(--line);border-radius:12px;max-width:min(460px,calc(100vw - 32px));padding:24px;color:var(--ink);background:var(--paper)}dialog::backdrop{background:#183b3ba8}dialog h2{margin:0;font-size:1.5rem}.dialog-actions{display:flex;justify-content:flex-end;gap:10px;flex-wrap:wrap}.dialog-actions button:last-child{background:var(--ink);color:white}.guide{max-width:780px}.guide h1{margin-top:24px}.guide h2{margin-top:32px}.guide li{line-height:1.65;margin-bottom:10px}.example{display:flex;flex-wrap:wrap;gap:5px;padding:20px 0}.example span{min-width:50px;text-align:center;border:1px solid var(--ink);background:var(--paper);padding:7px;font-family:ui-monospace,monospace;font-size:1.4rem}.example small{display:block;font-size:.8rem}.word-list{font-family:ui-monospace,monospace;font-size:.9rem;line-height:1.85;overflow-wrap:anywhere}.play-link{display:inline-flex;align-items:center;min-height:44px;padding:10px 20px;background:var(--ink);color:white;border-radius:7px;text-decoration:none}.play-link:hover{color:white;background:#315952}@media(max-width:660px){.site-header,main,footer{width:calc(100% - 32px)}.site-header{padding:17px 0}.heading{display:block;margin:16px 0 20px}.modes{width:max-content;margin-top:18px}.play-area{grid-template-columns:1fr;gap:26px}.paper{max-width:440px;width:100%;margin-inline:auto;padding:14px}.decoder{max-width:440px;width:100%;margin-inline:auto}.letter-pad{gap:4px}.quick-rules{margin-top:30px}.paper-heading{font-size:.78rem}.cell .value{font-size:1.75rem}.cell .number{font-size:.72rem}.heading p{font-size:.94rem}footer{gap:19px}}@media(prefers-reduced-motion:no-preference){button{transition:background-color .12s ease}}@media(forced-colors:active){.cell[aria-current=true]{outline:3px solid Highlight;outline-offset:-4px}.block{background:CanvasText}.cell[data-given=true] .value{text-decoration:underline}}