:root{color-scheme:light;--ink:#33294f;--muted:#665976;--paper:#fffefb;--ground:#f1eff8;--line:#aaa1b9;--accent:#f4cd72;--focus:#7250a1;--danger:#a32135;font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--ground);color:var(--ink)}*{box-sizing:border-box}body{margin:0}button,input{font:inherit;color:inherit}button{min-height:44px;min-width:44px;border:1px solid var(--line);border-radius:10px;padding:.65rem .9rem;background:var(--paper);cursor:pointer;font-weight:650}button:hover:not(:disabled){background:#e8e0f4;border-color:var(--ink)}button:disabled{cursor:default;color:#746c80;background:#e7e3ed}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:10;padding:12px}.skip:focus{top:10px}header,main,footer{width:min(100% - 40px,930px);margin-inline:auto}header{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:23px 0}.brand{display:flex;align-items:center;gap:8px;text-decoration:none;font-size:1.25rem;letter-spacing:-.03em;font-weight:760}.brand svg{width:30px;fill:var(--accent);stroke:var(--ink);stroke-width:2}.brand .sprig{stroke-width:2}h1{font-size:clamp(1.9rem,4vw,2.8rem);letter-spacing:-.045em;margin:0;line-height:1.12}p{line-height:1.6}.title-row{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:30px 0}.title-row p{color:var(--muted);margin:9px 0 0}.mode{display:flex;gap:4px;flex:none}.mode button{background:transparent;border-color:transparent}.mode button[aria-pressed=true]{background:var(--ink);color:white}.game-layout{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(240px,.88fr);gap:clamp(25px,5vw,55px);align-items:start}.puzzle-meta{display:flex;justify-content:space-between;gap:10px;margin:0 0 12px;font-size:.84rem;font-variant-numeric:tabular-nums}.board{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:3px solid var(--ink);box-shadow:8px 8px 0 #ddd6e9;background:var(--paper)}.board [role=row]{display:contents}.board [role=gridcell]{min-width:0}.cell{width:100%;min-height:44px;aspect-ratio:1;border:0;border-right:1px solid #c1b9ca;border-bottom:1px solid #c1b9ca;border-radius:0;position:relative;padding:20px 5px 2px;background:var(--paper);font-size:clamp(1.8rem,5vw,2.5rem);font-weight:570;line-height:1;isolation:isolate}.cell[data-box-right=true]{border-right:3px solid var(--ink)}.cell[data-box-bottom=true]{border-bottom:3px solid var(--ink)}.cell[data-edge-right=true]{border-right:0}.cell[data-edge-bottom=true]{border-bottom:0}.cage-outline{position:absolute;pointer-events:none;border-color:#625279;border-style:dashed;z-index:-1}.cage-total{position:absolute;left:9px;top:7px;background:var(--paper);font-size:.77rem;line-height:1.05;font-weight:750;padding:0 2px;z-index:2}.cell[data-cage=true]{background:#efe7fa}.cell[data-cage=true] .cage-total{background:#efe7fa}.cell[aria-current=true]{background:var(--accent);box-shadow:inset 0 0 0 3px var(--ink)}.cell[aria-current=true] .cage-total{background:var(--accent)}.cell:focus-visible{outline-offset:-4px;z-index:2}.cell[aria-invalid=true] .value{text-decoration:underline wavy var(--danger);text-underline-offset:6px}.conflict-icon{font-size:13px;position:absolute;bottom:7px;right:8px;color:var(--danger);font-weight:850}.cell .value{display:inline-block}#board-help{font-size:.86rem;color:var(--muted);margin-top:18px}.controls{padding-top:30px}.cage-readout{border-left:4px solid var(--ink);padding-left:18px;margin-bottom:20px}#cage-label{font-size:.95rem;font-weight:650}.sum{font-size:2.7rem;letter-spacing:-.04em;line-height:1.1;margin:8px 0;font-variant-numeric:tabular-nums}.sum .of{font-weight:300;color:var(--muted)}#cage-detail{font-size:.9rem;color:var(--muted);margin:0}.pad{display:grid;grid-template-columns:repeat(4,minmax(44px,1fr));gap:8px}.pad button{font-size:1.6rem;min-height:56px;background:var(--ink);border-color:var(--ink);color:white}.pad button:hover:not(:disabled){background:#554270}.pad button:disabled{background:#d9d3e4;color:#6b6375;border-color:#aaa1b9}.clear{width:100%;margin:8px 0 17px;background:transparent}.actions{display:flex;gap:8px}.actions button{flex:1}.feedback{min-height:3.2em;font-size:.93rem;margin:15px 0}.finish{margin-top:12px}.finish h2{font-size:1.5rem;letter-spacing:-.02em;margin:0}.finish p{margin:5px 0 14px}.finish button{background:var(--accent);border-color:var(--ink);width:100%}.next-practice{background:transparent}.rules{margin:38px 0 24px;max-width:720px;border-top:1px solid var(--line);padding-top:23px}.rules h2{margin:0;font-size:1.45rem}.rules p{margin:10px 0}.collection{font-size:.86rem;color:var(--muted);max-width:720px}footer{display:flex;gap:24px;margin-top:30px;padding:25px 0 35px;border-top:1px solid var(--line);font-size:.86rem}.notice{background:#fff5d8;border:1px solid #8c7040;border-left:4px solid #8c7040;padding:13px 16px;margin-bottom:20px}.notice p{margin:0 0 10px}.notice details{margin-top:12px}.notice pre{white-space:pre-wrap;overflow-wrap:anywhere}[hidden]{display:none!important}dialog{max-width:min(460px,calc(100vw - 32px));border:1px solid var(--line);border-radius:14px;background:var(--paper);color:var(--ink);padding:24px}dialog::backdrop{background:#33294faa}dialog h2{font-size:1.5rem;margin:0}.dialog-actions{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}.dialog-actions button:last-child{background:var(--ink);color:white}.guide{max-width:730px}.guide h1{margin-top:25px}.guide h2{margin-top:30px}.guide li{line-height:1.65;margin:9px 0}.play-link{display:inline-flex;min-height:44px;align-items:center;background:var(--ink);color:white;text-decoration:none;padding:10px 20px;border-radius:10px}.play-link:hover{background:#554270;color:white}.example{width:200px;max-width:100%;margin:20px 0;overflow:visible}.example text{font-family:inherit;fill:var(--ink)}.combinations{border-collapse:collapse;width:100%;max-width:350px}.combinations th,.combinations td{padding:9px;border-bottom:1px solid var(--line);text-align:left}@media(max-width:620px){header,main,footer{width:calc(100% - 32px)}header{padding:18px 0}.title-row{display:block;margin:17px 0 22px}.mode{margin-top:16px}.game-layout{grid-template-columns:1fr;gap:8px}.puzzle-side,.controls{max-width:430px;width:100%;margin-inline:auto}.controls{padding-top:5px}.cage-readout{display:grid;grid-template-columns:1fr auto;column-gap:15px;margin-bottom:16px}.sum{grid-column:2;grid-row:1/3;font-size:2rem;align-self:center;margin:0}#cage-detail{margin-top:4px}.cell{font-size:2rem}.rules{margin-top:26px}.title-row p{font-size:.94rem}.actions{gap:6px}.actions button{padding:.6rem .5rem}footer{gap:18px}}@media(prefers-reduced-motion:no-preference){button{transition:background-color .12s ease}}@media(forced-colors:active){.cage-outline{border-color:CanvasText}.cell[aria-current=true]{outline:3px solid Highlight;outline-offset:-4px}.conflict-icon{color:CanvasText}}