.sudoku-workspace{max-width:1040px;margin:auto}.sudoku-workspace .panel-body{padding:28px}
.sudoku-tabs{display:inline-flex;gap:5px;padding:5px;background:#edf2fa;border-radius:11px;margin-bottom:25px}
.sudoku-tabs button{background:transparent;border:0;border-radius:8px;color:var(--muted);padding:9px 20px;min-width:130px}
.sudoku-tabs button.active{background:white;color:var(--ink);font-weight:700;box-shadow:0 2px 8px #102b4d12}
.sudoku-upload{margin-bottom:24px}.sudoku-upload label{display:block;font-weight:700;margin-bottom:8px}
.sudoku-upload input[type=file]{display:block;width:100%;max-width:600px;padding:13px;border:1px dashed #aebed2;border-radius:10px;background:#f8fafc;cursor:pointer}
.sudoku-upload p{margin:8px 0 14px}.sudoku-preview{display:block;max-width:min(100%,420px);max-height:300px;object-fit:contain;border:1px solid var(--line);border-radius:10px;margin:15px 0}
.sudoku-board-wrap{width:min(100%,580px);margin:8px auto 25px;overflow:hidden}.sudoku-grid{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));width:100%;direction:ltr;border:3px solid #24324a;border-radius:5px;overflow:hidden;background:white}
.sudoku-cell{min-width:0;width:100%;aspect-ratio:1;display:flex;align-items:center;justify-content:center;text-align:center;border:0;border-right:1px solid #d0d8e5;border-bottom:1px solid #d0d8e5;background:white;color:var(--ink);font-family:Vazirmatn,Arial,sans-serif;font-size:clamp(17px,3vw,31px);font-weight:700;line-height:1;padding:0;outline-offset:-4px}
input.sudoku-cell{appearance:none;border-radius:0}.sudoku-cell:nth-child(9n){border-right:0}.sudoku-cell:nth-last-child(-n+9){border-bottom:0}
.sudoku-cell.sudoku-block-right{border-right:3px solid #24324a}.sudoku-cell.sudoku-block-bottom{border-bottom:3px solid #24324a}
.sudoku-cell.sudoku-low{background:#fff4dc;box-shadow:inset 0 0 0 2px #e8aa41}.sudoku-cell.sudoku-filled{color:var(--blue);background:#f4f7ff}.sudoku-cell.sudoku-given{color:var(--ink);background:#fbfcfe}
.sudoku-actions{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px;margin-top:14px}.sudoku-review-note,.sudoku-warning,.sudoku-error{padding:11px 15px;border-radius:9px;line-height:1.9}
.sudoku-review-note{background:#eef4ff;color:#35527a}.sudoku-warning{background:#fff5e8;color:#82520f}.sudoku-error{background:#fff0f1;color:#a62c40}
.sudoku-answer{max-width:1040px;margin:22px auto 0}.sudoku-answer .panel-body{padding:24px}.sudoku-answer .sudoku-board-wrap{margin-top:22px}
@media(max-width:640px){.sudoku-workspace .panel-body,.sudoku-answer .panel-body{padding:16px}.sudoku-tabs{display:flex;width:100%}.sudoku-tabs button{flex:1;min-width:0;padding:9px 8px}.sudoku-board-wrap{width:100%}.sudoku-cell{font-size:clamp(15px,5vw,25px)}.sudoku-actions .button{flex:1;min-width:125px}}
@media(max-width:640px){.sidebar nav{overflow-x:auto;justify-content:flex-start;gap:2px;scrollbar-width:none}.sidebar nav::-webkit-scrollbar{display:none}.sidebar .nav-item{flex:0 0 auto}}