.sudoku-play-area{display:grid;gap:18px}.game-timer{width:min(100%,560px);display:flex;align-items:center;justify-content:space-between;min-height:44px;padding:10px 14px;border:2px solid #20242a;border-radius:8px;background:#fffdfa;color:#20242a}.game-timer-label{font-size:.82rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.game-timer-value{font-variant-numeric:tabular-nums;font-size:1.25rem;font-weight:900;line-height:1}.sudoku-board{width:min(100%,560px);aspect-ratio:1;display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);border:3px solid #20242a;background:#20242a;box-shadow:0 18px 48px #1f24282e}.sudoku-cell{appearance:none;display:grid;place-items:center;min-width:0;min-height:0;padding:0;border:1px solid #9ea7a3;background:#fffdfa;color:#20242a;cursor:pointer;font-size:clamp(1.2rem,7vw,2.8rem);font-weight:700;line-height:1;transition:background-color .14s ease,box-shadow .14s ease,color .14s ease}.sudoku-cell:hover{background:#edf8f3}.sudoku-cell:focus-visible{outline:3px solid #ca5c4f;outline-offset:-5px}.sudoku-cell-selected{background:#d9f0e8;box-shadow:inset 0 0 0 3px #1d7c6f;color:#144d46}.sudoku-cell-locked{background:#ece8df;color:#20242a;cursor:default;font-weight:900}.sudoku-cell-locked:hover{background:#ece8df}.sudoku-cell-locked.sudoku-cell-selected{background:#e0ddd5;box-shadow:inset 0 0 0 3px #8a8175}.sudoku-cell:nth-child(3n){border-right-color:#20242a;border-right-width:3px}.sudoku-cell:nth-child(9n){border-right-width:1px}.sudoku-cell:nth-child(n+19):nth-child(-n+27),.sudoku-cell:nth-child(n+46):nth-child(-n+54){border-bottom-color:#20242a;border-bottom-width:3px}.sudoku-cell:nth-child(n+73):nth-child(-n+81){border-bottom-width:1px}.number-pad{width:min(100%,560px);display:grid;grid-template-columns:repeat(9,1fr);gap:8px}.number-pad-button{appearance:none;min-width:0;min-height:48px;border:2px solid #20242a;border-radius:8px;background:#fffdfa;color:#20242a;cursor:pointer;font-size:1.25rem;font-weight:800;line-height:1}.number-pad-button:hover,.number-pad-button:focus-visible{background:#20242a;color:#fffdfa}.number-pad-button:disabled{border-color:#c7cfcc;background:#ece8df;color:#8b918f;cursor:not-allowed}.number-pad-button:disabled:hover{border-color:#c7cfcc;background:#ece8df;color:#8b918f}.number-pad-button:focus-visible{outline:3px solid #ca5c4f;outline-offset:2px}.check-panel{width:min(100%,560px);display:grid;gap:10px}.game-actions{display:grid;grid-template-columns:minmax(128px,1fr) minmax(86px,.7fr) minmax(150px,1.2fr);gap:10px}.check-solution-button,.hint-button,.restart-button{appearance:none;min-height:52px;border-radius:8px;cursor:pointer;font-size:1rem;font-weight:800}.restart-button{border:2px solid #20242a;background:#20242a;color:#fffdfa}.restart-button:hover,.restart-button:focus-visible{background:#3a4046;border-color:#3a4046}.check-solution-button{border:2px solid #1d7c6f;background:#1d7c6f;color:#fffdfa}.check-solution-button:hover,.check-solution-button:focus-visible{background:#144d46;border-color:#144d46}.hint-button{border:2px solid #20242a;background:#fffdfa;color:#20242a}.hint-button:hover,.hint-button:focus-visible{background:#20242a;color:#fffdfa}.hint-button:disabled{border-color:#c7cfcc;background:#ece8df;color:#8b918f;cursor:not-allowed}.hint-button:disabled:hover{border-color:#c7cfcc;background:#ece8df;color:#8b918f}.check-solution-button:focus-visible,.hint-button:focus-visible,.restart-button:focus-visible{outline:3px solid #ca5c4f;outline-offset:2px}.check-message{margin:0;min-height:24px;font-weight:800}.check-message-success{color:#1d7c6f}.check-message-error{color:#a23f35}@media(max-width:560px){.game-timer,.sudoku-board,.number-pad,.check-panel{width:100%}.number-pad{gap:6px}.number-pad-button{min-height:42px;border-radius:6px;font-size:1rem}.game-actions{grid-template-columns:1fr}}.app-shell{min-height:100vh;display:grid;place-items:center;padding:32px 18px;background:linear-gradient(135deg,rgba(29,124,111,.12),transparent 34%),linear-gradient(315deg,rgba(202,92,79,.12),transparent 38%),#f7f4ef;color:#1f2428}.game-surface{width:min(100%,620px);display:grid;gap:18px}.game-header{display:grid;gap:4px}.game-kicker{margin:0;color:#1d7c6f;font-size:.82rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.game-header h1{margin:0;color:#20242a;font-size:clamp(2rem,8vw,4.75rem);line-height:.95;letter-spacing:0}@media(max-width:560px){.app-shell{align-items:start;padding-top:24px}.game-surface{gap:16px}}*{box-sizing:border-box}html{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f7f4ef}body{margin:0}button,input,textarea,select{font:inherit}