*{box-sizing:border-box}body{margin:0;background:#f7f8f2;color:#25372d;font-family:system-ui,sans-serif}main{max-width:500px;margin:auto;padding:14px 10px}button,select{font:inherit;touch-action:manipulation}button{cursor:pointer;background:#fff;color:inherit;border:1px solid #c9d3c0;border-radius:9px;min-height:46px}button:focus-visible,select:focus-visible{outline:3px solid #638342;outline-offset:-3px}.top{display:flex;align-items:center;justify-content:space-between;gap:12px}.top strong{font-size:23px}.top button{padding:0 14px}#timer{font-variant-numeric:tabular-nums}.level{display:flex;align-items:center;gap:10px;margin-top:12px;font-size:14px}select{min-height:44px;border:1px solid #c9d3c0;border-radius:8px;padding:6px 14px;background:white;color:inherit}#status{font-size:13px;min-height:38px;line-height:1.5;margin:12px 0 6px}#board{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));border:2px solid #40573d;border-radius:4px;overflow:hidden;width:100%;aspect-ratio:1}.cell{min-height:0;aspect-ratio:1;border:0;border-right:1px solid #c6d0bf;border-bottom:1px solid #c6d0bf;border-radius:0;font-size:clamp(18px,5vw,27px);padding:0;color:#315e9b;background:#fff}.cell.given{font-weight:750;color:#26352a;background:#e9eee2}.cell:nth-child(3n){border-right:2px solid #40573d}.cell:nth-child(9n){border-right:0}.cell:nth-child(n+19):nth-child(-n+27),.cell:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid #40573d}.cell.selected{background:#d4e8af;box-shadow:inset 0 0 0 2px #638342}.cell.error{color:#b32b3e;background:#ffe0df}.cell small{display:grid;grid-template-columns:repeat(3,1fr);font-size:clamp(8px,2.1vw,11px);line-height:1.2;color:#5c7054}.tools{display:flex;gap:7px;margin:14px 0 10px}.tools button{flex:1;font-size:13px}.tools button[aria-pressed=true]{background:#354e32;color:white}#keys{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}#keys button{font-size:22px;background:#e9eedf;min-height:48px}.hint{font-size:12px;line-height:1.8;color:#65735c}.credit{text-align:center;font-size:10px;color:#75806e;line-height:1.6}.credit a{color:inherit}