:root{color-scheme:light;--paper:#faf8ef;--ink:#3e3934;--muted:#8b8177;--line:#d8d0c5;--panel:#f1eee7;--cyan:#4f9294;--orange:#dc795d;--blue:#dce9e8;--red:#d85f5f}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--paper);color:var(--ink);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}body{display:flex;justify-content:center}.page{width:min(720px,100%);padding:20px 16px 18px}header{height:44px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;border-bottom:1px solid var(--line);margin-bottom:14px}header h1{margin:0;font-size:24px;letter-spacing:.16em}header a,header button{border:0;background:none;color:var(--muted);text-decoration:none;font:10px inherit;letter-spacing:.1em;padding:12px 0;cursor:pointer}header button{text-align:right}.toolbar{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:7px;margin-bottom:10px}.toolbar>*{border:1px solid var(--line);background:var(--panel);padding:8px;display:flex;flex-direction:column;gap:4px;color:var(--muted);font-size:8px;letter-spacing:.07em}.toolbar b{font-size:12px;color:var(--ink)}select{border:0;background:transparent;color:var(--ink);font:700 11px inherit;padding:0}.game-layout{display:flex;justify-content:center;align-items:flex-start;gap:16px}.board-wrap{position:relative;width:min(100%,486px);background:#aba296;padding:4px;box-shadow:5px 5px #ddd5c9}.board{display:grid;grid-template-columns:repeat(9,1fr);background:#82796f;border:2px solid #82796f;touch-action:manipulation;user-select:none}.cell{position:relative;aspect-ratio:1;border:0;border-right:1px solid #cbc3b7;border-bottom:1px solid #cbc3b7;background:#f7f3eb;color:var(--cyan);font:700 clamp(18px,5vw,28px) inherit;display:grid;place-items:center;padding:0;cursor:pointer;touch-action:manipulation}.cell:nth-child(3n){border-right:2px solid #82796f}.cell:nth-child(n+19):nth-child(-n+27),.cell:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid #82796f}.cell.given{color:var(--ink);background:#eee9df}.cell.peer{background:#edf2ef}.cell.same{background:#dcebea}.cell.selected{background:#cde1df;box-shadow:inset 0 0 0 2px var(--cyan)}.cell.error{color:var(--red);background:#f6dada}.notes{position:absolute;inset:2px;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);font-size:clamp(6px,1.8vw,10px);font-weight:600;color:#718086}.notes span{display:grid;place-items:center}.overlay{position:absolute;inset:4px;background:#faf8eff2;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:12px}.overlay.hide{display:none}.overlay b{font-size:27px;letter-spacing:.12em}.overlay span{font-size:9px;color:var(--muted);letter-spacing:.08em}.overlay button{border:0;background:var(--cyan);color:#fff;padding:12px 20px;min-height:44px;font:700 10px inherit;letter-spacing:.1em;box-shadow:3px 3px #397475}.game-layout aside{width:150px}.actions{display:grid;grid-template-columns:1fr 1fr;gap:7px}.actions button{height:70px;border:1px solid var(--line);background:var(--panel);color:var(--ink);font:700 20px inherit;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;touch-action:manipulation}.actions button span{font-size:8px;color:var(--muted);letter-spacing:.06em}.actions button.active{background:var(--blue);border-color:var(--cyan);color:var(--cyan)}aside p{color:var(--muted);font-size:8px;line-height:1.8;margin:12px 0}.number-pad{display:grid;grid-template-columns:repeat(9,1fr);gap:6px;margin:14px auto 0;max-width:486px}.number-pad button{height:48px;border:1px solid var(--line);background:var(--panel);color:var(--cyan);font:700 19px inherit;touch-action:manipulation}.number-pad button:active,.actions button:active{background:#dde7e3}footer{text-align:center;border-top:1px solid var(--line);margin-top:18px;padding-top:12px;color:var(--muted);font-size:8px;letter-spacing:.06em}@media(max-width:620px){.page{padding:8px 10px 14px}header{margin-bottom:7px}.toolbar{grid-template-columns:repeat(4,1fr);gap:4px;margin-bottom:6px}.toolbar>*{padding:6px 4px}.toolbar label{min-width:0}.game-layout{display:block}.board-wrap{width:100%;max-width:min(486px,calc(100svh - 260px));margin:auto;padding:3px}.game-layout aside{width:100%;margin-top:8px}.actions{grid-template-columns:repeat(4,1fr)}.actions button{height:46px;font-size:15px}.actions button span{font-size:7px}aside p{display:none}.number-pad{gap:3px;margin-top:8px}.number-pad button{height:44px;font-size:17px}footer{margin-top:10px}.overlay{inset:3px}}@media(max-width:370px){header h1{font-size:19px}.toolbar>*{font-size:6px}.toolbar b,select{font-size:9px}.cell{font-size:17px}.number-pad button{height:40px;padding:0}}