:root{color-scheme:light dark;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.5;font-weight:400;color:#1f2933;background-color:#f8fafc}*{box-sizing:border-box}body{margin:0;min-height:100vh}#root{display:flex;min-height:100vh}button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;border-radius:.75rem;background:linear-gradient(135deg,#2563eb,#7c3aed);color:#f8fafc;font-weight:600;padding:.75rem 1.25rem;cursor:pointer;transition:transform .1s ease,box-shadow .1s ease}button:hover{transform:translateY(-1px);box-shadow:0 8px 16px #2563eb4d}button:disabled{cursor:not-allowed;opacity:.7;box-shadow:none}label{display:flex;flex-direction:column;gap:.25rem;font-size:.875rem;font-weight:600;color:#0f172a}select,input[type=date]{padding:.5rem .75rem;border-radius:.5rem;border:1px solid #cbd5f5;background:#fff}.sudoku-grid{display:grid;gap:2px;border:2px solid #1f2933;border-radius:.75rem;overflow:hidden;background:#1f2933}.sudoku-cell{width:100%;aspect-ratio:1 / 1;border:none;text-align:center;font-size:clamp(1rem,2vw,1.5rem);font-weight:600;color:#0f172a;background:#fff;transition:background .15s ease,box-shadow .15s ease}.sudoku-cell.striped{background:#f1f5f9}.sudoku-cell:focus{outline:none;box-shadow:inset 0 0 0 2px #2563eb}.sudoku-cell.fixed{background:#0f172a;color:#f8fafc;cursor:default}.sudoku-cell.conflict{background:#fee2e2;color:#991b1b}