:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;-webkit-tap-highlight-color:transparent;--paper:#f4f3ef;--ink:#22392f;--muted:#78847c;--green:#285743;--soft:#e7ede6;--line:#d9ded5;--red:#bc5650;--board-size:504px;--grid-line:#cbd3c8;--grid-line-width:1.5px;--box-line-width:3px;--digit-font:"Microsoft YaHei UI", serif}*{box-sizing:border-box}body{background:var(--paper);color:var(--ink);margin:0;font-family:Inter,Segoe UI,Microsoft YaHei,sans-serif;font-size:14px}button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}button:focus-visible,input:focus-visible,textarea:focus-visible{outline-offset:3px;outline:3px solid #9ebcad}button{touch-action:manipulation}.shell{max-width:1100px;margin:0 auto;padding:35px 42px 28px}.header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding-bottom:26px;display:flex}.site-actions{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:8px;margin-left:auto;display:flex}.site-action{color:#2d638c;white-space:nowrap;background:#edf5fb;border:1px solid #cbdfea;border-radius:8px;justify-content:center;align-items:center;gap:6px;min-height:38px;padding:9px 10px;font-size:13px;display:inline-flex}.site-action:hover:enabled{background:#dfedf7;border-color:#a8c7de}.site-action svg{fill:none;stroke:currentColor;stroke-width:1.6px;stroke-linecap:round;stroke-linejoin:round;flex:none;width:17px;height:17px}.header{flex-wrap:wrap;gap:16px}@media (width<=560px){.site-actions{gap:5px}.site-action{gap:4px;padding:8px 6px;font-size:12px}.site-action svg{width:15px;height:15px}}.brand{flex:none;align-items:center;gap:12px;display:flex}.brand-icon{object-fit:contain;flex-shrink:0;width:80px;height:auto;display:block;transform:translateY(3px)}.brand-name{width:180px;height:auto;display:block}.workspace{grid-template-columns:minmax(0,564px) minmax(280px,352px);justify-content:space-between;gap:32px;margin-top:24px;display:grid}.board-card{background:#fff;border:1px solid #e6e8e0;border-radius:18px;padding:16px 28px 22px;box-shadow:0 5px 24px #22392f06}.board-top{grid-template-columns:max-content minmax(0,1fr) max-content;align-items:center;gap:8px;margin-bottom:12px;display:grid}.timer{cursor:pointer;font-variant-numeric:tabular-nums;color:#55738e;text-align:center;white-space:nowrap;background:0 0;border:0;border-radius:6px;justify-self:center;padding:6px 4px;font:15px ui-monospace,Consolas,monospace}.rating-toggle,.analysis-button{color:#2d638c;white-space:nowrap;font-variant-numeric:tabular-nums;background:#edf5fb;border:1px solid #cbdfea;border-radius:8px;justify-content:center;align-items:center;gap:7px;min-height:36px;padding:7px 10px;font-size:12px;line-height:1;display:inline-flex}.rating-toggle{justify-self:start}.rating-toggle:hover,.rating-toggle[aria-expanded=true]{background:#dfedf7}.rating-toggle:focus-visible,.analysis-button:focus-visible{outline-color:#89b9db}.rating-separator{color:#aac5d9;font-weight:400}.rating-toggle strong{font-size:inherit;font-weight:600}.rating-points{align-items:center;gap:4px;display:inline-flex}.board-top svg{fill:none;stroke:currentColor;stroke-width:1.7px;stroke-linecap:round;stroke-linejoin:round;flex:none;width:15px;height:15px}.analysis-button{color:#fff;background:#387aaf;border-color:#387aaf;justify-self:end}.analysis-button:hover{background:#2d699a;border-color:#2d699a}.rating-card{color:var(--muted);background:#f4f6f1;border-radius:7px;margin:0 0 12px;padding:10px 12px;font-size:11px;line-height:1.7}.rating-card p{margin:9px 0 0}.rating-section{border-top:1px solid var(--line);margin-top:14px;padding-top:12px}.rating-section h3{color:var(--ink);margin:0 0 7px;font-size:12px}.rating-usage{grid-template-columns:1fr 1fr;gap:6px 12px;display:grid}.rating-usage div{background:#fff9;border-radius:4px;padding:6px 8px}.rating-score-parts{color:var(--green);font-variant-numeric:tabular-nums}#retry-rating{border:1px solid var(--line);color:var(--green);background:#fff;border-radius:5px;margin:0 0 12px;padding:4px 8px;font-size:12px}#board-stage{scroll-margin-top:24px;position:relative}#board-stage:after,.sudoku-board-stage:after{content:"";z-index:6;pointer-events:none;border:var(--box-line-width) solid #4e6356;background:linear-gradient(to right, transparent calc(100% / 3 - var(--box-line-width)), #4e6356 calc(100% / 3 - var(--box-line-width)), #4e6356 calc(100% / 3), transparent calc(100% / 3), transparent calc(200% / 3 - var(--box-line-width)), #4e6356 calc(200% / 3 - var(--box-line-width)), #4e6356 calc(200% / 3), transparent calc(200% / 3)), linear-gradient(to bottom, transparent calc(100% / 3 - var(--box-line-width)), #4e6356 calc(100% / 3 - var(--box-line-width)), #4e6356 calc(100% / 3), transparent calc(100% / 3), transparent calc(200% / 3 - var(--box-line-width)), #4e6356 calc(200% / 3 - var(--box-line-width)), #4e6356 calc(200% / 3), transparent calc(200% / 3));border-radius:4px;position:absolute;inset:0}#human-preview{z-index:4;pointer-events:none;background:#fff;border-radius:4px;position:absolute;inset:0;overflow:hidden}.human-grid{height:100%}.human-marks span{border-radius:50%}.human-source{color:#285c82;background:#dceeff;font-weight:700}.human-remove{color:#9c321f;background:#ffe4ce;font-weight:700;text-decoration:line-through}.human-place{background:#cce7f5;outline:1px solid #2c7196}.human-lines{width:100%;height:100%;position:absolute;inset:0}.human-panel{border:1px solid var(--line);background:#f4f6f1;border-radius:8px;margin-top:24px;padding:13px;font-size:12px;line-height:1.65}.human-panel>summary{cursor:pointer;color:var(--green);font-weight:600}#human-count{color:var(--muted);padding-left:15px;font-size:10px;font-weight:400;display:block}.human-panel p{margin:10px 0}.human-controls{flex-wrap:wrap;gap:6px;margin:10px 0;display:flex}.human-controls button,.human-controls select{border:1px solid var(--line);color:var(--green);font:inherit;background:#fff;border-radius:5px;padding:5px 8px}#human-steps{overscroll-behavior:contain;gap:4px;max-height:320px;display:grid;overflow-y:auto}.human-step{text-align:left;color:var(--ink);font:inherit;background:#ffffffb8;border:1px solid #0000;border-radius:5px;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:8px;padding:8px;display:grid}.human-step.active{background:#e3eddf;border-color:#628c6e}.human-step-content{overflow-wrap:anywhere;min-width:0}.human-step-label{display:block}.human-step small{color:var(--muted);font-size:10px}.human-step-complexity{text-align:right;white-space:nowrap;color:var(--green);font-variant-numeric:tabular-nums;font-weight:600}.human-step-complexity small{font-weight:400;display:block}#human-step-detail{border-top:1px solid var(--line);margin-top:12px;padding-top:12px}#human-step-title{color:var(--green);font-size:12px}#human-step-reason,#human-step-effects{overflow-wrap:anywhere}.human-branch{background:#ffffff80;border:1px solid #cedfeb;border-radius:7px;min-width:0;margin:8px 0}.human-branch>summary{cursor:pointer;overflow-wrap:anywhere;color:#315875;padding:7px 8px}.human-branch-level{color:#406382;background:#deebf7;border-radius:4px;margin-right:6px;padding:0 5px;font-size:10px;display:inline-block}.human-branch-assumption{font-weight:600}.human-branch-meta{color:var(--muted);margin-top:2px;font-size:10px;display:block}.human-branch-body{border-left:2px solid #accbe4;min-width:0;margin:0 6px 7px;padding-left:clamp(6px,1vw,10px)}.human-branch ol{overflow-wrap:anywhere;margin:5px 0;padding-left:18px}.human-branch-children{min-width:0}.human-branch-conclusion{color:#78545d;overflow-wrap:anywhere}#human-branches{overscroll-behavior:contain;max-height:460px;overflow-y:auto}.human-legend{color:var(--muted);font-size:10px}.workspace{isolation:isolate;position:relative}.workspace.replaying:before{content:"";z-index:-1;inset:var(--replay-top,0px) 0 0;background:#edf6ff;border:1px solid #cddfee;border-radius:18px;position:absolute}.replaying .board-card{box-shadow:none;background:0 0;border-color:#0000}.replaying .input-controls,.replaying #seed,.replaying #game-message{display:none}.replaying .sidebar{padding:calc(var(--replay-top,0px) + 16px) 16px 18px 0}.replaying .human-panel{background:0 0;border:0;margin:0;padding:0}.replaying .human-controls{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:0 0 12px;display:grid}.replaying .human-controls button{color:#36688e;white-space:nowrap;border-color:#c9dcea;padding:9px 8px}.replaying #human-update{grid-column:1/-1}.replaying #human-continue{color:#fff;background:#397bae;border-color:#397bae}.replaying .human-controls button:disabled{opacity:.4;cursor:default}.replaying .human-step.active{background:#dceeff;border-color:#76a8ce}.replaying #human-step-title,.replaying .human-step-complexity{color:#36688e}.human-grid .human-cell.human-error{color:#a32c2c;background:#ffe2e2;box-shadow:inset 0 0 0 2px #d16464}.replaying .human-step-correction{color:#932e2e;background:#fff0f0;border-color:#e4a3a3}.replaying .human-step-correction small{color:#a44747}.replaying .human-step-correction.active{background:#fdd;border-color:#c95656}@media (hover:hover){.replaying .human-step{cursor:pointer;transition:border-color .12s}.replaying .human-step:hover:not(.active){border-color:#76a8ce}.replaying .human-step-correction:hover:not(.active){border-color:#c95656}}.human-cell.human-filled-source{box-shadow:inset 0 0 0 2px #76a8ce}.timer:hover,.timer[aria-expanded=true]{color:#735393;background:#ebe5fa}#history-preview{z-index:4;pointer-events:none;background:#fff;border-radius:4px;position:absolute;inset:0;overflow:hidden}.workspace.history-mode:before{background:#f3effb;border-color:#ddd1ee}.history-panel{font-size:12px;line-height:1.65}.history-controls{grid-template-columns:repeat(3,minmax(0,1fr));align-items:stretch;gap:8px;margin-bottom:12px;display:grid}.history-controls button{color:#765496;font:inherit;white-space:nowrap;cursor:pointer;background:#fff;border:1px solid #d9cce9;border-radius:6px;padding:9px 5px}.history-switches{grid-column:1/-1;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.history-controls button:disabled{opacity:.4;cursor:default}.history-switches button[aria-pressed=true]{background:#e6daf7;border-color:#bba1d8}#history-continue{color:#fff;background:#8963af;border-color:#8963af}#history-steps{overscroll-behavior:contain;gap:4px;max-height:320px;display:grid;overflow-y:auto}.history-step{text-align:left;color:#634f76;font:inherit;cursor:pointer;background:#ffffffb8;border:1px solid #0000;border-radius:5px;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:8px;padding:8px;display:grid}.history-step small{color:#8b7a9b;font-size:10px}.history-step time{color:#765496;font-variant-numeric:tabular-nums}.history-step.active{background:#e8ddf7;border-color:#b395d2}.history-grid{height:100%}.history-values{justify-content:center;align-items:center;gap:.08em;display:flex}.history-values:has(>span+span){font-size:.75em}.history-grid .history-remove,.history-diff .history-remove{color:#b43e44;background:0 0;font-weight:600;text-decoration:line-through;text-decoration-thickness:1.5px}.history-grid .history-add,.history-diff .history-add{color:#288455;font-weight:600}.history-grid :is(.history-add,.history-remove),.history-diff :is(.history-add,.history-remove){isolation:isolate;position:relative}.history-grid :is(.history-add,.history-remove):before,.history-diff :is(.history-add,.history-remove):before{content:"";z-index:-1;pointer-events:none;border-radius:50%;width:1.15em;height:1.15em;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.history-grid .history-add:before,.history-diff .history-add:before{background:#dcefdc}.history-grid .history-remove:before,.history-diff .history-remove:before{background:#fbe0e0}.history-diff{flex-wrap:wrap;align-items:center;gap:2px 8px;display:flex}.history-diff-cell{align-items:center;gap:3px;display:inline-flex}@media (hover:hover){.history-step:hover:not(.active){border-color:#b395d2}}@media (width<=699px),(orientation:portrait){.workspace.replaying{row-gap:0}.replaying .sidebar{padding:0 22px 22px}}#game{align-self:start;min-width:0}.board{aspect-ratio:1;border:var(--box-line-width) solid #4e6356;background:#fff;border-radius:4px;grid-template-rows:repeat(9,minmax(0,1fr));grid-template-columns:repeat(9,minmax(0,1fr));width:100%;display:grid;overflow:hidden}.cell{border:0;border-right:var(--grid-line-width) solid var(--grid-line);border-bottom:var(--grid-line-width) solid var(--grid-line);color:#38765b;min-width:0;min-height:0;font-family:var(--digit-font);font-variant-numeric:lining-nums tabular-nums;background:#fff;border-radius:0;justify-content:center;align-items:center;padding:0;font-size:clamp(20px,2.6vw,29px);font-weight:400;line-height:normal;transition:background .1s;display:flex;position:relative}.cell.box-right{border-right:var(--box-line-width) solid #4e6356}.cell.box-bottom{border-bottom:var(--box-line-width) solid #4e6356}.cell.last-col{border-right:0}.cell.last-row{border-bottom:0}.cell.given{color:var(--ink);font-weight:600}.cell.peer{background:#f1f4ef}.cell.same{background:#e1eae0}.cell.selected{z-index:1;background:#cbdece;box-shadow:inset 0 0 0 2px #6d937c}.cell.error{color:var(--red);background:#faebe8}.cell.hinted{color:#926d28}.cell:focus-visible{outline:none;box-shadow:inset 0 0 0 3px #50755d}.notes{color:#7b887e;width:100%;height:100%;font:11px var(--digit-font);font-variant-numeric:lining-nums tabular-nums;grid-template-rows:repeat(3,minmax(0,1fr));grid-template-columns:repeat(3,minmax(0,1fr));padding:3px;display:grid}.notes span{justify-content:center;align-items:center;min-width:0;min-height:0;display:flex}.sidebar{min-width:0;padding-top:3px}#board.hint-return .cell,.human-grid .cell{transition:none}@media (width>=700px) and (orientation:landscape){.workspace{grid-template-rows:auto minmax(0,1fr);grid-template-areas:"game challenge""game sidebar";row-gap:16px}.workspace>#game{grid-area:game}.workspace>.challenge-bar{grid-area:challenge;margin-bottom:0}.workspace>.sidebar{grid-area:sidebar}.workspace.replaying>.challenge-bar{visibility:hidden;pointer-events:none}.workspace.replaying>.sidebar{grid-row:1/-1}.workspace:not(.replaying) .sidebar{margin-top:var(--replay-top,0px);align-self:center;padding-top:0}}.challenge-bar{margin-bottom:10px}.challenge-controls{grid-template-columns:minmax(0,1fr);align-items:center;gap:10px;display:grid}.puzzle-actions{grid-template-columns:repeat(2,minmax(0,1fr));align-items:center;gap:10px;margin-top:8px;display:grid}#new-game,#previous-game{white-space:nowrap;letter-spacing:0;border-radius:6px;height:40px;padding:0 10px;font-size:12px}#new-game.searching{isolation:isolate;opacity:1;cursor:default;position:relative;overflow:hidden}#new-game.searching:before{content:"";z-index:-1;background:linear-gradient(90deg,#0000,#b8ddff99,#0000);animation:1.6s ease-in-out infinite new-puzzle-search;position:absolute;inset:0}@keyframes new-puzzle-search{0%{transform:translate(-100%)}to{transform:translate(100%)}}@media (prefers-reduced-motion:reduce){#new-game.searching:before{opacity:.45;animation:none;transform:none}}.help-button{border:1px solid var(--line);width:30px;height:30px;color:var(--green);background:0 0;border-radius:50%;flex:none;place-items:center;padding:0;font-size:15px;font-weight:600;display:grid}.help-button:hover{background:var(--soft)}.difficulty{background:#e9ece5;border-radius:9px;grid-template-columns:repeat(7,minmax(0,1fr));gap:4px;padding:4px;display:grid}.difficulty button{color:#758174;white-space:nowrap;background:0 0;border:0;border-radius:6px;min-width:0;padding:9px 0;font-size:12px}.difficulty button.active{color:var(--green);background:#fff;font-weight:600;box-shadow:0 1px 4px #22392f0c}.primary{background:var(--green);color:#fff;letter-spacing:1px;border:0;border-radius:9px;width:100%;padding:13px;font-size:13px}.primary:hover{background:#204835}.divider{background:var(--line);height:1px;margin:24px 0}.tools{grid-auto-columns:minmax(0,1fr);grid-auto-flow:column;gap:8px;margin-top:12px;display:grid}.tool{color:#5b6d5f;background:0 0;border:1px solid #dbe0d7;border-radius:9px;flex-direction:column;align-items:center;gap:7px;padding:12px 3px 10px;font-size:11px;display:flex}.tool:hover,.tool.active{background:var(--soft);border-color:#a6b7a8}.tool svg{stroke:currentColor;stroke-width:1.6px;fill:none;stroke-linecap:round;stroke-linejoin:round;width:18px;height:18px}.tool.active{color:var(--green);background:#e5eee1;border-color:#9eb397}:is(#notes,#clear){isolation:isolate;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;position:relative;overflow:hidden}:is(#notes,#clear):before{content:"";z-index:-1;pointer-events:none;transform-origin:bottom;background:#abc59b80;position:absolute;inset:0;transform:scaleY(0)}:is(#notes,#clear).long-press-pending:before{animation:note-hold-fill var(--long-press-duration) linear forwards}:is(#notes,#clear).long-press-fired:before{animation:none;transform:scaleY(1)}:is(#notes,#clear).long-press-fired{box-shadow:inset 0 0 0 2px #71906b}@keyframes note-hold-fill{0%{transform:scaleY(0)}to{transform:scaleY(1)}}.input-controls{width:100%;max-width:504px;margin:0 auto}.keypads{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;max-width:352px;margin:0 auto;display:grid}.number-pad{aspect-ratio:1;background:#fff;border:1px solid #e0e5dc;border-radius:12px;grid-template-rows:repeat(3,minmax(0,1fr));grid-template-columns:repeat(3,minmax(0,1fr));gap:4px;padding:7px;display:grid}.number-pad button{min-width:0;min-height:0;color:var(--green);font-size:24px;font-family:var(--digit-font);font-variant-numeric:lining-nums tabular-nums;background:0 0;border:0;border-radius:6px;place-items:center;padding:0;display:grid;position:relative}.number-pad button:hover:enabled{background:var(--soft)}.note-indicator{border:1.5px solid #92a396;border-radius:50%;width:7px;height:7px;position:absolute;top:4px;right:4px}.note-pad button[aria-pressed=true] .note-indicator{background:var(--green);border-color:var(--green)}.note-pad button[aria-pressed=true]{background:#edf3ea}.number-pad button:disabled,.input-controls button:disabled{cursor:default}.shortcuts{color:var(--muted);margin-top:13px;font-size:10px;line-height:1.9}.game-message{color:var(--green);overflow-wrap:anywhere;margin:12px 2px 0;font-size:12px;line-height:1.8}.game-message.error-status{color:var(--red)}.seed{color:var(--muted);overflow-wrap:anywhere;margin-top:17px;font-size:10px;line-height:1.7}.seed button{font:inherit;color:inherit;text-align:left;text-underline-offset:3px;background:0 0;border:0;padding:0;text-decoration:underline}.footer{border-top:1px solid var(--line);color:#8b948a;justify-content:space-between;gap:20px;margin-top:32px;padding-top:19px;font-size:10px;line-height:1.8;display:flex}.footer strong{color:#687767;font-weight:500}.loading-dot{animation:.8s infinite alternate pulse}@keyframes pulse{to{opacity:.3}}.win .board{border-color:#7b9a68}.win .below-board{color:#54764b}dialog{border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:16px;width:min(460px,100vw - 32px);padding:28px;box-shadow:0 24px 100px #1d342b25}dialog::backdrop{-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);background:#20382f66}dialog h2{margin:0 0 12px;font-size:21px;font-weight:500}dialog p{color:var(--muted);font-size:12px;line-height:1.9}dialog textarea{resize:vertical;border:1px solid var(--line);width:100%;min-height:145px;color:var(--ink);background:#fff;border-radius:8px;padding:12px;font:13px/1.7 ui-monospace,Consolas,monospace}dialog .dialog-actions{gap:10px;margin-top:18px;display:flex}dialog .dialog-actions button{flex:1}dialog .secondary{border:1px solid var(--line);color:var(--ink);background:0 0;border-radius:8px;padding:11px}.difficulty-guide-heading{justify-content:space-between;align-items:center;gap:16px;display:flex}.difficulty-guide-heading h2{margin:0}#difficulty-guide h3{margin:18px 0 8px;font-size:13px}#difficulty-guide-tiers{margin:16px 0}.difficulty-guide-tier{border-bottom:1px solid var(--line);grid-template-columns:40px minmax(0,1fr);gap:12px;padding:10px 0;font-size:12px;line-height:1.8;display:grid}.difficulty-guide-tier dt{color:var(--green);font-weight:600}.difficulty-guide-tier dd{color:var(--muted);margin:0}.dialog-error{min-height:18px;color:var(--red)!important}.file-label{color:var(--green);cursor:pointer;margin-top:12px;font-size:12px;text-decoration:underline;display:inline-block}.file-label input{display:none}[hidden]{display:none!important}.image-workspace{align-items:start;display:grid}.image-source-section,.image-review-section{min-width:0}.image-drop{text-align:center;background:#edf4fa;border:1px dashed #a1b7c9;border-radius:12px;padding:22px 16px}.image-drop.drag-over{background:#dceeff;border-color:#4b8dbd}.image-drop p{margin:10px 0 0}.image-actions{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.image-actions .primary{width:auto}.image-stage{background:#eaf0f4;border-radius:10px;justify-content:center;margin:10px 0;padding:10px;display:flex}#image-source{touch-action:none;width:auto;max-width:100%;height:auto;max-height:min(46dvh,430px);margin:auto;display:block}#image-name{overflow-wrap:anywhere;margin:12px 0 4px;font-size:12px}#image-status{min-height:24px;color:var(--green);margin:12px 0}.image-help{margin:10px 0;font-size:12px}.image-recognition-actions{margin-top:12px}.image-options{align-items:center;gap:7px;font-size:12px;display:flex}#image-summary{font-size:14px}.sudoku-board-stage{position:relative}.board{touch-action:manipulation}.board .cell{-webkit-user-select:none;user-select:none}.image-review-grid .cell.note-cell{background:#e6f1f8}.image-review-grid .cell.uncertain{background:#fff2cb}.image-review-grid .cell.selected{background:#cbdece}.image-review-grid .cell.error{background:#faebe8}.image-review-grid .cell:disabled{opacity:1;cursor:default}#image-note-mode[aria-pressed=true]{color:var(--green);background:#e5eee1;border-color:#9eb397}.image-cell-popup{z-index:30;width:226px;max-width:calc(100vw - 24px);color:var(--ink);pointer-events:none;background:#f5faff;border:1px solid #bbcfdd;border-radius:10px;margin:0;padding:9px;position:fixed;inset:auto;box-shadow:0 6px 20px #264f6f26}.image-cell-comparison{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.image-cell-comparison figure{min-width:0;margin:0}.image-cell-comparison canvas{aspect-ratio:1;background:#fff;border:1px solid #d4dfe7;border-radius:5px;width:100%;display:block}@media (width<=700px){#image-source{max-height:38dvh}.image-review-grid .cell{font-size:clamp(20px,6vw,29px)}}@media (width>=700px) and (width<=950px) and (orientation:landscape){.shell{padding:24px}.workspace{grid-template-columns:minmax(0,1fr) minmax(260px,300px);gap:24px}.board-card{padding:16px 22px 22px}.tools{gap:5px}}@media (width<=699px),(orientation:portrait){.shell{max-width:720px;padding:24px}.workspace{grid-template-columns:minmax(0,1fr);gap:0}.workspace>.challenge-bar{width:100%}.workspace>.sidebar{margin-top:24px}.workspace.replaying>.sidebar{margin-top:0}.board-card{width:100%;max-width:564px;margin:0 auto;padding:16px 22px 22px}.challenge-bar{max-width:564px;margin:0 auto 10px}.sidebar{width:100%;max-width:564px;margin:0 auto}.cell{font-size:29px}.divider{margin:19px 0}.footer{margin-top:27px}}@media (width<=430px){.puzzle-actions{gap:6px}.help-button{width:28px;height:28px}.difficulty{border-radius:6px;gap:1px;padding:3px}.difficulty button{font-size:11px}#new-game,#previous-game{height:38px;padding:0 7px;font-size:11px}.shell{padding:20px 15px}.header{padding-bottom:20px}.workspace{margin-top:20px}.board-card{border-radius:12px;padding:12px}.board-top{gap:6px;margin-bottom:10px}.rating-toggle,.analysis-button{gap:5px;min-height:34px;padding:7px;font-size:11px}.board-top svg{width:13px;height:13px}.timer{font-size:13px}.cell{font-size:25px}.notes{padding:1px;font-size:9px}.tools{gap:5px}.tool{padding:10px 2px;font-size:10px}.footer{font-size:9px}.keypads{gap:12px;max-width:312px}.number-pad{gap:2px;padding:5px}.number-pad button{font-size:23px}}@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}.import-header{grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;display:grid}.import-header h2{text-align:center;margin:0;font-size:20px}.import-nav{color:#356c97;background:0 0;border:0;border-radius:6px;justify-self:start;padding:10px 6px;font-size:15px}.import-submit{justify-self:end;font-weight:600}.import-submit:disabled{color:#94a3af;opacity:.6}#import-error{min-height:0;margin:6px 0}#import-error:empty{display:none}#import-dialog .image-drop{flex-direction:column;justify-content:center;min-height:290px;margin-top:20px;padding:38px 24px;display:flex}.import-entry-actions{grid-template-columns:repeat(3,minmax(0,1fr));align-items:stretch;gap:18px;display:grid}.import-entry-actions>button,.import-entry-actions>label{text-align:center;justify-content:center;align-items:center;width:100%;min-height:60px;font-size:15px;display:flex}.import-file-label{cursor:pointer}.import-file-label:focus-visible{outline-offset:3px;outline:3px solid #9ebcad}.import-drop-help{justify-content:center;align-items:flex-start;gap:9px;display:flex;margin-top:24px!important}.import-drop-help svg{fill:none;stroke:#668ba7;stroke-width:1.5px;stroke-linecap:round;stroke-linejoin:round;flex:none;width:22px;height:22px}.import-drop-help span{max-width:660px}.import-header-middle{justify-content:center;align-items:center;min-width:0;display:flex}#import-dialog:not([data-import-view=entry]) #import-title{display:none}.import-edit-toolbar{justify-content:center;align-items:center;gap:12px;margin:0;display:flex}#import-dialog[data-import-view=image] .import-edit-toolbar{justify-content:space-between}.import-clear-wrap{position:relative}.import-clear-menu{z-index:12;background:#fff;border:1px solid #c8d9e5;border-radius:8px;min-width:150px;padding:5px;display:grid;position:absolute;top:calc(100% + 5px);right:0;box-shadow:0 6px 18px #254c6d20}.import-clear-menu button{color:var(--ink);text-align:left;white-space:nowrap;background:0 0;border:0;border-radius:5px;padding:11px 13px}.import-clear-menu button:hover,.import-clear-menu button:focus-visible{background:#e8f2fa}.import-content{isolation:isolate;display:flow-root;position:relative}.image-adjust-panel{z-index:10;overscroll-behavior:contain;background:#eaf4fc;border:1px solid #c8e0f1;border-radius:10px;margin:0;padding:16px;position:absolute;inset:0;overflow:auto}#image-import-pane[inert]{pointer-events:none}.image-adjust-panel #image-name{margin-top:0}#image-adjust-status{color:var(--green);margin:12px 0 0}#image-adjust-status:empty{display:none}.image-adjust-panel .image-stage{background:#dfedf7}.image-adjust-columns{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;gap:20px;display:grid}.image-adjust-columns>div{min-width:0}.image-adjust-columns .image-stage{align-items:center;height:min(46dvh,430px)}.image-adjust-columns #image-source,#image-selection-preview{width:auto;max-width:100%;height:auto;max-height:100%;display:block}#image-selection-preview{margin:auto}@media (width<=760px){.image-adjust-columns{grid-template-columns:minmax(0,1fr);gap:12px}}#image-import-pane{grid-template-columns:minmax(0,.9fr) minmax(0,1.4fr);gap:24px;margin-top:18px}#import-dialog[data-import-view=manual] #image-import-pane{max-width:720px;margin:8px auto 0;display:block}.image-display-stage{border:var(--box-line-width) solid #4e6356;background:#e9f0f5;border-radius:4px;padding:0;position:relative;overflow:hidden}.image-display-stage:after{content:"";pointer-events:none;background:linear-gradient(to right, transparent calc(3 * 100% / 9 - var(--box-line-width)), #4e6356 calc(3 * 100% / 9 - var(--box-line-width)), #4e6356 calc(3 * 100% / 9), transparent calc(3 * 100% / 9)), linear-gradient(to bottom, transparent calc(3 * 100% / 9 - var(--box-line-width)), #4e6356 calc(3 * 100% / 9 - var(--box-line-width)), #4e6356 calc(3 * 100% / 9), transparent calc(3 * 100% / 9)), linear-gradient(to right, transparent calc(6 * 100% / 9 - var(--box-line-width)), #4e6356 calc(6 * 100% / 9 - var(--box-line-width)), #4e6356 calc(6 * 100% / 9), transparent calc(6 * 100% / 9)), linear-gradient(to bottom, transparent calc(6 * 100% / 9 - var(--box-line-width)), #4e6356 calc(6 * 100% / 9 - var(--box-line-width)), #4e6356 calc(6 * 100% / 9), transparent calc(6 * 100% / 9)), linear-gradient(to right, transparent calc(1 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(1 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(1 * 100% / 9), transparent calc(1 * 100% / 9)), linear-gradient(to bottom, transparent calc(1 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(1 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(1 * 100% / 9), transparent calc(1 * 100% / 9)), linear-gradient(to right, transparent calc(2 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(2 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(2 * 100% / 9), transparent calc(2 * 100% / 9)), linear-gradient(to bottom, transparent calc(2 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(2 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(2 * 100% / 9), transparent calc(2 * 100% / 9)), linear-gradient(to right, transparent calc(4 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(4 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(4 * 100% / 9), transparent calc(4 * 100% / 9)), linear-gradient(to bottom, transparent calc(4 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(4 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(4 * 100% / 9), transparent calc(4 * 100% / 9)), linear-gradient(to right, transparent calc(5 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(5 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(5 * 100% / 9), transparent calc(5 * 100% / 9)), linear-gradient(to bottom, transparent calc(5 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(5 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(5 * 100% / 9), transparent calc(5 * 100% / 9)), linear-gradient(to right, transparent calc(7 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(7 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(7 * 100% / 9), transparent calc(7 * 100% / 9)), linear-gradient(to bottom, transparent calc(7 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(7 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(7 * 100% / 9), transparent calc(7 * 100% / 9)), linear-gradient(to right, transparent calc(8 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(8 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(8 * 100% / 9), transparent calc(8 * 100% / 9)), linear-gradient(to bottom, transparent calc(8 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(8 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(8 * 100% / 9), transparent calc(8 * 100% / 9));position:absolute;inset:0}#image-display{aspect-ratio:1;width:100%;height:auto;display:block}.image-display-tabs{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;margin:0 0 10px;display:grid}.image-display-toggle{grid-column:2}.image-recognition-option{white-space:nowrap;grid-column:1;justify-self:start;gap:5px}.image-recognition-option input{width:14px;height:14px;margin:0}@media (width<=900px){.image-recognition-option{gap:4px;font-size:11px}}.image-display-toggle{color:#668399;background:#edf4fa;border:1px solid #c7dbe9;border-radius:7px;align-items:center;gap:2px;padding:2px;display:inline-flex}.image-display-toggle span{border-radius:5px;padding:5px 10px;font-size:12px;line-height:1}.image-display-toggle span.active{color:#245e88;background:#d5e8f7;box-shadow:0 1px 3px #245e8814}#image-summary{min-height:20px;margin:0 0 8px}#image-results{grid-template-columns:minmax(0,1fr) 114px;align-items:start;gap:16px;display:grid}.image-review-controls{flex-direction:column;align-self:center;gap:10px;min-width:0;margin-top:0;display:flex}#image-note-buttons,#image-candidate-buttons{flex:none;gap:3px;width:114px;padding:6px}#image-note-buttons button,#image-candidate-buttons button{min-height:0;font-size:21px}.image-review-controls>.tool{flex-direction:row;width:100%;min-height:42px;padding:6px}#image-candidate-buttons button{color:#557e9d;font-size:18px;position:relative}#image-candidate-buttons button:after{content:"";border:1px solid;border-radius:50%;width:5px;height:5px;position:absolute;top:4px;right:4px}#image-candidate-buttons button[aria-pressed=true]:after{background:currentColor}.import-shake{animation:.36s ease-in-out import-shake}@keyframes import-shake{0%,to{transform:translate(0)}20%,60%{transform:translate(-5px)}40%,80%{transform:translate(5px)}}@media (prefers-reduced-motion:reduce){.import-shake{animation-duration:.01ms}}@media (width>=761px){#import-dialog[data-import-view=image] #image-import-pane{grid-template-rows:auto auto;grid-template-columns:minmax(0,1fr) minmax(0,1fr) 114px;gap:10px 24px}#import-dialog[data-import-view=image] .image-source-section,#import-dialog[data-import-view=image] #image-review-section,#import-dialog[data-import-view=image] #image-results{display:contents}#import-dialog[data-import-view=image] #image-summary{grid-area:1/2;margin:0}#import-dialog[data-import-view=image] .image-display-stage{grid-area:2/1;align-self:center}#import-dialog[data-import-view=image] .image-review-board-stage{grid-area:2/2;align-self:center}#import-dialog[data-import-view=image] .image-review-controls{grid-area:2/3;align-self:center}#import-dialog[data-import-view=image] .image-display-tabs{grid-area:1/1;align-self:center;margin:0}}@media (width<=760px){.import-header h2{font-size:18px}.import-entry-actions{grid-template-columns:1fr;gap:12px}#import-dialog .image-drop{min-height:330px;padding:24px 16px}.import-entry-actions>button,.import-entry-actions>label{min-height:48px;font-size:14px}#image-import-pane{grid-template-columns:minmax(0,1fr);gap:16px}.image-source-section{width:100%;margin:0 auto}#image-results{grid-template-columns:minmax(0,1fr)}.image-review-controls{grid-template-columns:auto 1fr 1fr auto;align-items:center;gap:8px;display:grid}#image-note-buttons,#image-candidate-buttons{width:100%}.image-review-controls>.tool{flex-direction:column;width:36px;font-size:11px}}.share-heading{justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px;display:flex}.share-heading h2{margin:0}.share-layout{grid-template-columns:minmax(0,1fr) 220px;align-items:center;gap:28px;display:grid}.share-preview-wrap{background:#f4f3ef;border:1px solid #e0e4dc;border-radius:10px;justify-self:center;width:100%;min-width:0;max-width:min(440px,85.7143dvh - 128.571px);overflow:hidden}#share-preview{width:100%;height:auto;display:block}.share-controls{min-width:0}.share-options{border:0;gap:16px;margin:0 0 24px;padding:0;display:grid}.share-options legend{margin-bottom:18px;font-size:14px;font-weight:600}.share-options label{cursor:pointer;align-items:center;gap:10px;display:flex}.share-options input{width:17px;height:17px;accent-color:var(--green);margin:0}.share-buttons{gap:10px;display:grid}.share-buttons button{min-height:42px}#share-status{min-height:24px;color:var(--green);margin-bottom:0}#share-status.error{color:var(--red)}@media (width<=650px){.share-layout{grid-template-columns:minmax(0,1fr);gap:18px}.share-preview-wrap{width:min(100%,300px);margin:auto}.share-options{grid-template-columns:1fr 1fr;gap:12px;margin-bottom:18px}.share-options legend{margin-bottom:12px}.share-buttons{grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.share-buttons button{letter-spacing:0;padding:10px 4px;font-size:12px}}.language-switch{justify-content:center;font-family:inherit;text-decoration:none}html[lang=en] .difficulty button{padding-inline:3px;font-size:10px}.geo-attribution{color:inherit}html[lang=en] .image-recognition-option{white-space:normal;min-width:0}.sudoku-studio{background:var(--paper);color:var(--ink);-webkit-font-smoothing:antialiased;font-family:Inter,Segoe UI,Microsoft YaHei,sans-serif}.sudoku-studio [hidden]{display:none!important}.sudoku-studio svg{fill:none;stroke:currentColor;stroke-width:1.6px;stroke-linecap:round;stroke-linejoin:round}.sudoku-studio .shell{max-width:1180px;padding:25px 48px 24px}.sudoku-studio .header{border-color:#e5e2d9;gap:20px;min-height:75px;padding-bottom:21px}.sudoku-studio .brand{gap:12px}.sudoku-studio .brand-icon{width:74px;transform:translateY(3px)rotate(-3deg)}.sudoku-studio .brand-name{width:158px}.studio-brand-copy{gap:3px;display:grid}.sudoku-studio .site-actions{flex-wrap:nowrap;gap:8px}.studio-nav-button,.sudoku-studio .site-action{color:#626e63;white-space:nowrap;background:0 0;border:1px solid #0000;border-radius:10px;justify-content:center;align-items:center;gap:7px;min-height:40px;padding:9px 11px;font-size:12px;text-decoration:none;display:inline-flex}.studio-nav-button svg,.sudoku-studio .site-action svg{flex:none;width:17px;height:17px}.studio-nav-button:hover{background:#eeeae3}.studio-nav-button[aria-pressed=true]{color:#3d6049;background:#e7ede4}.sudoku-studio #import{color:#4a584e;background:#fffdfa;border-color:#e2dfd4}.sudoku-studio #import:hover{border-color:#b7bfae}.sudoku-studio #export{color:#3d6353;box-shadow:none;background:#ffffff80;border-color:#cbdacf}.sudoku-studio #export:hover{background:#ffffffd9;border-color:#a7c3b4}.studio-text-link{color:#8f573e;background:0 0;border:0;align-items:center;gap:7px;padding:3px 0;font-size:12px;line-height:1.6;text-decoration:none;display:inline-flex}.studio-text-link svg{width:15px;height:15px}.studio-text-link:hover{color:#603b2a;text-underline-offset:4px;text-decoration:underline}.sudoku-studio .workspace{grid-template-columns:minmax(0,640px) minmax(300px,380px);align-items:start;gap:20px 32px;margin-top:18px}.sudoku-studio{background-repeat:no-repeat;min-height:100dvh}.sudoku-studio :is(.board-card,.challenge-bar,.input-controls){border:1px solid #ffffffe6}.sudoku-studio .board-card{border-radius:24px;padding:23px 25px 25px}.sudoku-studio #board-stage{--grid-line-width:1.5px}.sudoku-studio #board,.sudoku-studio #human-preview,.sudoku-studio #history-preview,.sudoku-studio #board-stage .board{border-radius:11px}.sudoku-studio #board .cell{background:0 0}.sudoku-studio #board-stage .board{border-color:var(--studio-box-color)}.sudoku-studio #board-stage .cell.box-right{border-right-color:var(--studio-box-color)}.sudoku-studio #board-stage .cell.box-bottom{border-bottom-color:var(--studio-box-color)}.sudoku-studio .board-top{gap:10px;min-height:38px;margin-bottom:18px}.sudoku-studio .rating-toggle{color:#49634c;background:#f3f6ee;border-color:#e0e6db;border-radius:9px;min-height:36px;padding:8px 10px;font-size:12px}.sudoku-studio .rating-separator{color:#b7c1ae}.sudoku-studio .rating-toggle:hover{background:#eaf0e2}.sudoku-studio .timer{color:#747c72;font-variant-numeric:tabular-nums;letter-spacing:.05em;padding:8px 5px;font-family:Segoe UI,sans-serif;font-size:13px}.sudoku-studio .timer:hover,.sudoku-studio .timer[aria-expanded=true]{color:#79509a;background:#f1eaf8}.sudoku-studio .analysis-button{color:#406781;background:#f2f7fa;border-color:#d9e4e9;border-radius:9px;min-height:36px;padding:8px 11px;font-size:12px}.sudoku-studio .analysis-button:hover,.sudoku-studio .analysis-button[aria-expanded=true]{background:#e2eef6;border-color:#b6cedc}.sudoku-studio #board,.sudoku-studio .human-grid,.sudoku-studio .history-grid{border-color:#456052}.sudoku-studio #board .cell:not(.given){color:#38778b}.sudoku-studio .challenge-bar{border-radius:20px;padding:18px}.studio-challenge-head{justify-content:space-between;align-items:center;gap:12px;margin-bottom:11px;display:flex}.studio-challenge-head h2{color:#4a564b;margin:0;font-size:13px;font-weight:600}.sudoku-studio .help-button{color:#7a846f;background:#ffffff80;border-color:#d7d9cc;width:27px;height:27px;font-size:14px}.sudoku-studio .difficulty{border-radius:10px;gap:2px;padding:4px;box-shadow:inset 0 1px 3px #55716212,0 1px #ffffffb3}.sudoku-studio .difficulty button{color:#68725e;min-height:38px;padding:10px 0;font-size:12px}.sudoku-studio .difficulty button:hover:not(.active){background:#eeeee5}.sudoku-studio .difficulty button.active{color:#315e4a;outline-offset:-1px;background:#ffffffd9;outline:1px solid #b3cfc1;font-weight:600;box-shadow:0 1px 3px #315f5014}.sudoku-studio .puzzle-actions{grid-template-columns:.85fr 1.15fr;gap:9px;margin-top:12px}.sudoku-studio #new-game,.sudoku-studio #previous-game{border-radius:10px;height:43px;font-size:12px}.sudoku-studio #previous-game{color:#66705f;box-shadow:none;background:#ffffff70;border:1px solid #d5d7c9}.sudoku-studio #previous-game:disabled{opacity:.45}.sudoku-studio #new-game{color:#fffaf6;box-shadow:none;background:#a7674d}.sudoku-studio #new-game:hover:enabled{background:#92503a}.sudoku-studio .workspace:not(.replaying) .sidebar{align-self:start;margin-top:0;padding-top:0}.sudoku-studio .input-controls{border-radius:20px;max-width:none;padding:18px}.sudoku-studio .keypads{gap:12px;max-width:none}.sudoku-studio .number-pad{border-color:#ffffffc9;border-radius:13px;gap:3px;padding:6px;box-shadow:inset 0 1px #fff,inset 0 -1px #a4bbac26,0 2px 6px #4762530a}.sudoku-studio .number-pad button{color:#405d47;box-shadow:none;background:0 0;border-radius:9px;font-size:23px}.sudoku-studio .number-pad button:hover:enabled{box-shadow:none;background:#e5efe5b3}.sudoku-studio .number-pad button:disabled{opacity:.42}.sudoku-studio .note-pad{border-color:#ffffffbf}.sudoku-studio .note-pad button{color:#517d87}.sudoku-studio .note-pad button:hover:enabled{box-shadow:none;background:#dbeef4b3}.sudoku-studio .input-controls .tools{grid-template-columns:repeat(3,minmax(0,1fr));grid-auto-flow:row;gap:7px;margin-top:15px}.sudoku-studio .input-controls .tool{color:#687464;min-height:42px;box-shadow:none;background:#ffffff80;border-color:#dce5dd;border-radius:9px;flex-direction:row;justify-content:center;gap:7px;padding:9px 5px;font-size:11px}.sudoku-studio .input-controls .tool svg{width:17px;height:17px}.sudoku-studio #hint{color:#54798b;background:#edf6fa99;border-color:#dce7ec}.sudoku-studio #notes[aria-pressed=true]{color:#396e87;background:#e6f0f5;border-color:#b9cfdb}.sudoku-studio .footer{color:#6d7368;border-color:#e3e1d6;margin-top:28px;padding-top:19px;font-size:10px;line-height:1.6}.sudoku-studio .footer strong{color:#7e866f;font-weight:500}.sudoku-studio .workspace.replaying:before{border-radius:22px}.sudoku-studio .replaying .board-card{box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;background:0 0;border-color:#0000}.sudoku-studio .replaying .sidebar{padding:20px 20px 20px 0}.sudoku-studio .human-panel,.sudoku-studio .history-panel{color:#304b5b;font-size:16px;line-height:1.8}.sudoku-studio .human-controls button,.sudoku-studio .history-controls button{border-radius:9px;min-height:46px;padding-inline:6px;font-size:14px}.sudoku-studio .human-step,.sudoku-studio .history-step{border-radius:9px;margin-bottom:3px;padding:12px 11px;line-height:1.7}.sudoku-studio .human-steps,.sudoku-studio #history-steps{scrollbar-width:thin}.studio-guide-head{justify-content:space-between;align-items:center;gap:18px;margin-bottom:24px;display:flex}.studio-guide-head h2{color:#40533f;margin:7px 0 0;font-size:23px;font-weight:550}.studio-eyebrow{color:#aa765a;letter-spacing:.07em;font-size:11px}.studio-guide-layout{grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:30px;display:grid}.studio-mini-board{aspect-ratio:1;background:#fffefb;border-top:2px solid #63725a;border-left:2px solid #63725a;grid-template-columns:repeat(9,1fr);display:grid}.studio-mini-board span{color:#b9bfb0;border-bottom:1px solid #dde1d5;border-right:1px solid #dde1d5;place-items:center;font-size:14px;display:grid}.studio-mini-board span:nth-child(3n){border-right:2px solid #63725a}.studio-mini-board span:nth-child(n+19):nth-child(-n+27),.studio-mini-board span:nth-child(n+46):nth-child(-n+54),.studio-mini-board span:nth-child(n+73){border-bottom:2px solid #63725a}.studio-mini-board span.example-row{color:#52684a;background:#f1f3e7;font-weight:600}.studio-mini-board span.example-hole{color:#aa6849;background:#f8e7d8;box-shadow:inset 0 0 0 2px #c78e67}.studio-mini-board span.example-solved{color:#3e6f81;background:#e3f0f3;box-shadow:inset 0 0 0 2px #96bfca}.sudoku-studio .studio-example-label{color:#79775f;margin:12px 0 8px;font-size:11px}.studio-demo-choices{gap:8px;display:flex}.studio-demo-choices button{color:#687458;background:#fff;border:1px solid #dfe4d3;border-radius:9px;flex:1;min-height:42px;font-size:19px}.studio-demo-choices button:hover,.studio-demo-choices button[aria-pressed=true]{background:#edf2e4;border-color:#9da98a}.sudoku-studio .studio-demo-feedback{color:#96765b;min-height:43px;margin-bottom:0;font-size:11px}.sudoku-studio .studio-demo-feedback.correct{color:#517b62}.studio-rule{gap:12px;margin-bottom:24px;display:flex}.studio-rule>span{color:#b5a48b;letter-spacing:.06em;padding-top:2px;font-size:11px}.studio-rule h3{color:#4d5d48;margin:0 0 7px;font-size:13px;font-weight:600}.sudoku-studio .studio-rule p{color:#6f7768;margin:0;font-size:12px;line-height:1.9}.studio-guide-lessons .primary{background:#a65e45;border-radius:10px;justify-content:center;align-items:center;gap:10px;min-height:45px;font-size:12px;display:flex}.studio-guide-lessons .primary svg{width:17px;height:17px}.studio-guide-lessons>.studio-text-link{justify-content:center;width:100%;margin-top:13px}@media (width<=1000px) and (orientation:landscape){.sudoku-studio .shell{padding:22px 26px}.sudoku-studio .workspace{grid-template-columns:minmax(0,1fr) 322px;gap:16px 24px}.sudoku-studio .board-card{padding:18px}.sudoku-studio .brand-icon{width:62px}.sudoku-studio .brand-name{width:137px}.sudoku-studio .site-actions{gap:3px}.studio-nav-button,.sudoku-studio .site-action{gap:5px;padding:8px;font-size:11px}}@media (width<=699px),(orientation:portrait){.sudoku-studio .shell{max-width:660px;padding:18px 20px 25px}.sudoku-studio .header{flex-wrap:wrap;gap:16px;padding-bottom:16px;display:flex}.sudoku-studio .brand-icon{width:65px}.sudoku-studio .brand-name{width:145px}.sudoku-studio .site-actions{justify-content:space-between;gap:5px;width:100%;margin:0}.studio-nav-button,.sudoku-studio .site-action{gap:5px;padding:8px 10px;font-size:12px}.sudoku-studio .workspace{grid-template-columns:minmax(0,1fr);gap:0}.sudoku-studio .challenge-bar{width:100%;max-width:564px;margin-bottom:16px;padding:13px}.studio-challenge-head{margin-bottom:8px}.studio-challenge-head h2{font-size:11px}.sudoku-studio .difficulty button{min-height:38px;padding:9px 0}.sudoku-studio .puzzle-actions{margin-top:8px}.sudoku-studio #new-game,.sudoku-studio #previous-game{height:41px}.sudoku-studio .board-card{border-radius:18px;max-width:564px;padding:17px}.sudoku-studio .board-top{gap:5px;margin-bottom:13px}.sudoku-studio .rating-toggle,.sudoku-studio .analysis-button{padding:7px 8px;font-size:11px}.sudoku-studio .workspace>.sidebar{margin-top:17px}.sudoku-studio .input-controls{padding:16px}.sudoku-studio .keypads{max-width:none}.sudoku-studio .number-pad button{font-size:25px}.sudoku-studio .input-controls .tools{grid-template-columns:repeat(3,minmax(0,1fr))}.sudoku-studio .input-controls .tool{min-height:43px;font-size:11px}.sudoku-studio .replaying .sidebar{margin-top:0;padding:0 17px 17px}.studio-guide-layout{gap:23px}.studio-guide-head h2{font-size:20px}}@media (width<=460px){.sudoku-studio .shell{padding:15px 15px 22px}.studio-challenge-head{display:none}.sudoku-studio .challenge-bar{margin-bottom:14px}.sudoku-studio .board-card{padding:12px}.sudoku-studio .rating-toggle,.sudoku-studio .analysis-button{gap:4px;padding-inline:6px;font-size:10px}.sudoku-studio .timer{font-size:12px}.sudoku-studio .rating-toggle svg,.sudoku-studio .analysis-button svg{width:13px;height:13px}.sudoku-studio .board-top{margin-bottom:11px}.sudoku-studio .input-controls{padding:13px}.sudoku-studio .number-pad button{font-size:23px}.sudoku-studio .footer{gap:12px;font-size:9px}.studio-guide-layout{grid-template-columns:minmax(0,1fr)}.studio-mini-board{max-width:265px;margin:auto}.studio-rule{margin-bottom:18px}.studio-guide-head h2{font-size:19px}}@media (prefers-reduced-motion:no-preference){.sudoku-studio .site-action,.sudoku-studio .input-controls .tool,.studio-nav-button{transition:background .15s,border-color .15s,color .15s}}@media (width<=699px),(orientation:portrait){.sudoku-studio .workspace:not(.replaying)>.sidebar{margin-top:17px}}@media (width<=460px){.sudoku-studio .site-actions{gap:4px}.sudoku-studio .site-actions>.studio-nav-button{gap:4px;padding-inline:6px;font-size:11px}.sudoku-studio .site-actions>.site-action{gap:4px;padding-inline:8px;font-size:11px}}@media (width<=699px),(orientation:portrait){.sudoku-studio .workspace{margin-top:14px}}.sudoku-studio #board-stage:after{content:"";z-index:6;pointer-events:none;border:var(--box-line-width) solid var(--studio-box-color);background:linear-gradient(to right, transparent calc(100% / 3 - var(--box-line-width)), var(--studio-box-color) calc(100% / 3 - var(--box-line-width)), var(--studio-box-color) calc(100% / 3), transparent calc(100% / 3), transparent calc(200% / 3 - var(--box-line-width)), var(--studio-box-color) calc(200% / 3 - var(--box-line-width)), var(--studio-box-color) calc(200% / 3), transparent calc(200% / 3)), linear-gradient(to bottom, transparent calc(100% / 3 - var(--box-line-width)), var(--studio-box-color) calc(100% / 3 - var(--box-line-width)), var(--studio-box-color) calc(100% / 3), transparent calc(100% / 3), transparent calc(200% / 3 - var(--box-line-width)), var(--studio-box-color) calc(200% / 3 - var(--box-line-width)), var(--studio-box-color) calc(200% / 3), transparent calc(200% / 3));border-radius:11px;position:absolute;inset:0}.sudoku-studio .human-step small,.sudoku-studio .history-step small,.sudoku-studio .human-branch-meta,.sudoku-studio .human-branch-level,.sudoku-studio .human-legend,.sudoku-studio #human-count{color:#4e6979;font-size:13px;line-height:1.65}.sudoku-studio #human-step-title{font-size:16px;line-height:1.7}.sudoku-studio #human-step-reason,.sudoku-studio #human-step-effects,.sudoku-studio #human-branches,.sudoku-studio #human-step-detail{font-size:16px;line-height:1.85}.sudoku-studio .human-step-complexity{font-size:15px}.sudoku-studio .human-branch>summary{padding:10px}.sudoku-studio .human-branch-body{padding-left:10px}.sudoku-studio .history-step small{color:#736081}.sudoku-studio .board-card{border-radius:24px}.sudoku-studio :is(.rating-toggle,.analysis-button,.input-controls .tool){box-shadow:none}@media (prefers-reduced-motion:no-preference){.sudoku-studio :is(.input-controls .tool,#new-game,#previous-game,.difficulty button){transition:transform .11s ease-out,background .14s ease-out}.sudoku-studio :is(.number-pad button,.input-controls .tool,#new-game,#previous-game,.difficulty button):active:enabled{transform:scale(.97)}}:root{--paper:#f5f7f8;--ink:#263c46;--muted:#667b85;--green:#28766c;--soft:#ecf3f4;--line:#dce5e8;--digit-font:"Segoe UI",system-ui,sans-serif;--red:#b24c47}.sudoku-workbench{color:var(--ink);background:#f5f7f8}.sudoku-workbench .shell{padding-top:20px}.sudoku-workbench .header{border-color:#dce5e8;min-height:70px;padding-bottom:17px}.sudoku-workbench .brand-icon{width:66px}.sudoku-workbench .brand-name{width:148px}.sudoku-workbench .site-action,.sudoku-workbench .studio-nav-button{color:#425e69;min-height:42px;font-size:13px}.sudoku-workbench #import,.sudoku-workbench #export{color:#365d6c;box-shadow:none;background:#fff;border:1px solid #d9e3e7}.sudoku-workbench :is(#import,#export){background:#eff7f8;border-color:#bcd6dc}.sudoku-workbench :is(#import,#export):hover{background:#e9f2f5;border-color:#a8c6d0}.sudoku-workbench .workspace{gap:18px 28px;margin-top:16px}.sudoku-workbench :is(.board-card,.challenge-bar,.input-controls){box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;background:#fff;border:1px solid #dde6ea}.sudoku-workbench .board-card{border-radius:16px;padding:20px}.sudoku-workbench .board-top{margin-bottom:16px}.sudoku-workbench #board-stage{--studio-box-color:#252c30;--grid-line:#8c979a;--box-line-width:3.5px;box-shadow:none;border-radius:14px}.sudoku-workbench :is(#board,#human-preview,#history-preview),.sudoku-workbench #board-stage .board,.sudoku-workbench #board-stage:after{border-radius:14px}.sudoku-workbench #board{box-shadow:none;background:#fff}.sudoku-workbench :is(#board,#image-review-grid) .cell{color:#234b61}.sudoku-workbench :is(#board,#image-review-grid) .cell.given{color:#171b1e;font-weight:600}.sudoku-workbench :is(#board,#image-review-grid) .cell.peer{box-shadow:none;background-color:#f6e2ec}.sudoku-workbench :is(#board,#image-review-grid) .cell.same{box-shadow:none;background-color:#edc3d7}.sudoku-workbench :is(#board,#image-review-grid) .cell.selected{color:#171b1e;box-shadow:none;z-index:1;background-color:#e6afca}.sudoku-workbench :is(#board,#image-review-grid) .cell.selected:before,.sudoku-workbench :is(#board,#image-review-grid) .cell.selected:after{content:none;animation:none}.sudoku-workbench :is(#board,#image-review-grid) .cell.error{color:#b3454a;background-color:#fff0f1}.sudoku-workbench :is(#board,#image-review-grid) .notes{color:#293236}.sudoku-workbench :is(#board,#image-review-grid) .cell.selected .notes{color:#20262a}.sudoku-workbench :is(#board,#image-review-grid) .cell:is(:focus,:focus-visible){box-shadow:none;outline:none}.sudoku-workbench .rating-toggle{color:#3b656b;background:#f2f7f7;border-color:#dce8e8}.sudoku-workbench .analysis-button{color:#2e7093;background:#edf6fb;border-color:#cbdfe9}.sudoku-workbench .timer{color:#526c79;font-size:14px}.sudoku-workbench .challenge-bar{border-radius:14px;padding:16px}.sudoku-workbench .difficulty{box-shadow:none;background:#eef3f5}.sudoku-workbench .difficulty button{color:#5b7380;font-size:12px}.sudoku-workbench .difficulty button.active{color:#246b72;background:#fff;outline:1px solid #bad5d9;box-shadow:0 1px 3px #2348550d}.sudoku-workbench #new-game{color:#fff;box-shadow:none;background:#287a70;font-size:13px}.sudoku-workbench #new-game:hover:enabled{background:#20685f}.sudoku-workbench #previous-game{color:#59727d;background:#fff;border-color:#dce5e8;font-size:13px}.sudoku-workbench .input-controls{border-radius:14px;padding:16px}.sudoku-workbench .number-pad{box-shadow:none;background:#f5f8fa;border:1px solid #e1e8ec;border-radius:12px;padding:5px}.sudoku-workbench .note-pad{background:#f0f7fb;border-color:#deebf1}.sudoku-workbench .number-pad button{box-shadow:none;color:#365969;background:0 0;font-size:27px;transition:transform .11s ease-out}.sudoku-workbench .note-pad button{color:#39738d}.sudoku-workbench .number-pad button:not([aria-pressed=true]):hover:enabled{box-shadow:none;background:0 0}.sudoku-workbench .number-pad button[aria-pressed=true],.sudoku-workbench .number-pad button[aria-pressed=true]:hover{background:#d8eaf4;box-shadow:inset 0 0 0 1px #9cc3d5}.sudoku-workbench .input-controls .tool{color:#4e6977;min-height:44px;box-shadow:none;background:#fff;border-color:#dce5e9;font-size:13px}.sudoku-workbench #hint{color:#2e779b;background:#f1f8fc;border-color:#d5e6ef}.sudoku-workbench .input-controls .tool:hover:enabled{background:#edf4f7}.sudoku-workbench .footer{color:#6a7d86;border-color:#dce5e8;font-size:11px}.sudoku-workbench .workspace.replaying:before{background:#edf5fc;border-color:#d4e3ee;border-radius:16px}.sudoku-workbench .workspace.history-mode:before{background:#f3effa;border-color:#ded5ee}.sudoku-workbench .replaying .board-card{box-shadow:none;background:0 0;border-color:#0000}.sudoku-workbench .replaying .sidebar{padding:16px 16px 16px 0}.sudoku-workbench :is(.human-panel,.history-panel){background:#ffffffc9;border:1px solid #d9e5ee;border-radius:12px;margin:0;padding:16px;font-size:15px;line-height:1.75}.sudoku-workbench .history-panel{color:#51415f;border-color:#e0d7eb}.sudoku-workbench :is(.human-controls,.history-controls) button{background:#fff;min-height:44px;font-size:13px}.sudoku-workbench .human-step{background:#fff;border-color:#e3edf4}.sudoku-workbench .human-step.active{background:#e4f2fc;border-color:#9ac3dd}.sudoku-workbench .history-step{background:#fff;border-color:#e9e2f1}.sudoku-workbench .history-step.active{background:#eee5f9;border-color:#c2a9db}.sudoku-workbench :is(#human-steps,#history-steps){max-height:clamp(210px,29vh,320px)}.sudoku-workbench #human-step-detail{border-color:#dce8f0}.sudoku-workbench .human-branch{background:#fff;border-color:#d7e5f0}.sudoku-workbench .human-branch-body{border-left-color:#b3d1e6}.sudoku-workbench .share-layout{grid-template-columns:minmax(0,1fr) 290px;align-items:start;gap:26px}.sudoku-workbench .share-preview-wrap{border-color:#d9e3e7;max-width:380px;margin-top:4px}.sudoku-workbench .share-options{gap:14px;margin:0 0 18px}.sudoku-workbench .share-options legend{margin-bottom:14px}.wb-share-text{color:#526e7d;margin-bottom:15px;font-size:13px;display:block}.wb-share-text>span{margin-bottom:8px;display:block}.sudoku-workbench .wb-share-text textarea{resize:none;color:#456674;background:#f5f8fa;border-color:#dce6eb;width:100%;min-height:80px;font:13px/1.7 ui-monospace,monospace}.sudoku-workbench .share-buttons button{min-height:45px}.sudoku-workbench .import-header{grid-template-columns:auto minmax(0,1fr) auto}.wb-import-right{justify-content:flex-end;align-items:center;gap:8px;display:flex}.sudoku-workbench .import-nav{color:#42697c;border-radius:9px;min-height:42px;padding:9px 12px}.sudoku-workbench #import-confirm{color:#fff;background:#287a70;min-width:68px}.sudoku-workbench #import-confirm:disabled{color:#9aaab2;background:#edf2f4}.sudoku-workbench #import-cancel{background:#f3f7f9}.sudoku-workbench #import-dialog:not([data-import-view=entry]) #import-cancel:before{content:"←";margin-right:6px}.sudoku-workbench .image-drop{background:#f6f9fc;border-color:#b6cbd7;padding:28px 22px}.sudoku-workbench .import-entry-actions{gap:14px}.sudoku-workbench .import-entry-actions>:is(button,label){color:#436576;text-align:left;background:#fff;border:1px solid #d9e5ec;border-radius:12px;flex-direction:column;justify-content:center;align-items:flex-start;gap:17px;min-height:158px;padding:22px;display:flex}.sudoku-workbench .import-entry-actions>:is(button,label):hover{background:#eff7fc;border-color:#7aadc6}.sudoku-workbench .import-entry-actions svg{color:#427e99;width:28px;height:28px}.sudoku-workbench .import-entry-actions strong{font-size:16px;font-weight:600;display:block}.sudoku-workbench .import-entry-actions small{color:#7b909c;margin-top:6px;font-size:13px;line-height:1.5;display:block}.sudoku-workbench .import-drop-help{margin-bottom:0;font-size:13px}.sudoku-workbench .import-clear-menu{background:#fff;border-color:#d5e3eb;border-radius:11px;min-width:190px;padding:6px;box-shadow:0 12px 30px #1e44571c}.sudoku-workbench .import-clear-menu button{text-align:left;width:100%;min-height:44px;font-size:14px}.sudoku-workbench .import-clear-menu button[data-clear=all]{color:#ae4a50}.sudoku-workbench .image-adjust-panel{background:#f0f7fc;border-color:#cbdfed;border-radius:12px}.sudoku-workbench #image-editor:not([hidden]){flex-direction:column;display:flex;overflow:hidden}.sudoku-workbench .image-adjust-columns{overscroll-behavior:contain;flex:1;min-height:0;padding-bottom:4px;overflow:auto}.sudoku-workbench .image-recognition-actions{border-top:1px solid #d5e5f0;flex:none;justify-content:flex-end;gap:10px;margin:8px 0 0;padding:10px 0 0;display:flex}.sudoku-workbench .wb-entry-icon{display:flex}@media (width<=699px),(orientation:portrait){.sudoku-workbench .header{gap:12px}.sudoku-workbench .board-card{padding:15px}.sudoku-workbench .challenge-bar{padding:12px}.sudoku-workbench .replaying .sidebar{padding:0 15px 15px}.sudoku-workbench .replaying :is(.human-panel,.history-panel){padding:13px}.sudoku-workbench .share-layout{grid-template-columns:minmax(0,1fr);gap:18px}.sudoku-workbench .share-preview-wrap{max-width:230px}.sudoku-workbench .share-options{grid-template-columns:1fr 1fr}.sudoku-workbench .share-buttons{grid-template-columns:repeat(3,minmax(0,1fr))}.sudoku-workbench .share-buttons button{font-size:13px}.sudoku-workbench #import-dialog:not([data-import-view=entry]) .import-header-middle{grid-area:2/1/auto/-1}.sudoku-workbench .image-drop{padding:18px 14px}.sudoku-workbench .import-entry-actions{grid-template-columns:1fr;gap:10px}.sudoku-workbench .import-entry-actions>:is(button,label){flex-direction:row;justify-content:flex-start;align-items:center;gap:16px;min-height:84px;padding:17px}.sudoku-workbench .import-entry-actions small{margin-top:4px}.sudoku-workbench .import-entry-actions svg{flex:0 0 27px}}@media (width<=460px){.sudoku-workbench .board-card{padding:12px}.sudoku-workbench .site-actions{gap:4px}.sudoku-workbench .site-actions>.site-action{padding-inline:8px;font-size:12px}.sudoku-workbench .number-pad button{font-size:25px}.sudoku-workbench .rating-toggle,.sudoku-workbench .analysis-button{font-size:11px}.sudoku-workbench :is(.human-controls,.history-controls) button{padding-inline:3px;font-size:13px}.sudoku-workbench .import-header{gap:7px}.sudoku-workbench .import-header h2{font-size:18px}.sudoku-workbench .wb-import-right{gap:5px}.sudoku-workbench .import-nav{padding:8px 9px;font-size:13px}}@media (prefers-reduced-motion:no-preference){.sudoku-workbench details[open]>:not(summary){animation:.14s ease-out wb-details-in}@keyframes wb-details-in{0%{opacity:.4;translate:0 -3px}to{opacity:1;translate:0}}}.sudoku-workbench .board{container-type:inline-size}.sudoku-workbench .board .cell{font-size:5.74324cqi;font-weight:500}.sudoku-workbench .board .cell.given{font-weight:600}.sudoku-workbench .board .notes{padding:.506757cqi;font-size:2.36486cqi;font-weight:600}.sudoku-workbench #board-stage :is(.human-grid,.history-grid) .cell.given{color:#171b1e}.sudoku-workbench #board-stage .notes{color:#293236}.sudoku-workbench .site-actions{flex-wrap:wrap}.sudoku-workbench :is(#human-step-title,#human-step-reason,#human-step-effects,#human-branches,#human-step-detail){font-size:15px}.sudoku-workbench :is(.human-step small,.history-step small,.human-branch-meta,.human-branch-level,.human-legend,#human-count){font-size:12px}.sudoku-workbench .human-step-complexity{font-size:14px}.sudoku-workbench :is(.image-review-board-stage,.image-display-stage){--studio-box-color:#252c30;--grid-line:#8c979a;--grid-line-width:1.5px;--box-line-width:3.5px;border-radius:14px}.sudoku-workbench :is(#image-review-grid,.image-display-stage){border-color:var(--studio-box-color);background:#fff;border-radius:14px}.sudoku-workbench #image-review-grid .cell{border-radius:0;min-width:0;min-height:0}.sudoku-workbench #image-review-grid .cell.box-right{border-right-color:var(--studio-box-color)}.sudoku-workbench #image-review-grid .cell.box-bottom{border-bottom-color:var(--studio-box-color)}.sudoku-workbench #image-review-grid .cell.note-cell:not(.selected):not(.error):not(.uncertain){background:#fff}.sudoku-workbench #image-review-grid .notes{color:#293236}.sudoku-workbench .image-review-board-stage:after{content:"";z-index:6;pointer-events:none;border:var(--box-line-width) solid var(--studio-box-color);background:linear-gradient(to right, transparent calc(100% / 3 - var(--box-line-width)), var(--studio-box-color) calc(100% / 3 - var(--box-line-width)), var(--studio-box-color) calc(100% / 3), transparent calc(100% / 3), transparent calc(200% / 3 - var(--box-line-width)), var(--studio-box-color) calc(200% / 3 - var(--box-line-width)), var(--studio-box-color) calc(200% / 3), transparent calc(200% / 3)), linear-gradient(to bottom, transparent calc(100% / 3 - var(--box-line-width)), var(--studio-box-color) calc(100% / 3 - var(--box-line-width)), var(--studio-box-color) calc(100% / 3), transparent calc(100% / 3), transparent calc(200% / 3 - var(--box-line-width)), var(--studio-box-color) calc(200% / 3 - var(--box-line-width)), var(--studio-box-color) calc(200% / 3), transparent calc(200% / 3));border-radius:14px;position:absolute;inset:0}.sudoku-workbench .image-display-stage:after{content:"";pointer-events:none;background:linear-gradient(to right, transparent calc(3 * 100% / 9 - var(--box-line-width)), var(--studio-box-color) calc(3 * 100% / 9 - var(--box-line-width)), var(--studio-box-color) calc(3 * 100% / 9), transparent calc(3 * 100% / 9)), linear-gradient(to bottom, transparent calc(3 * 100% / 9 - var(--box-line-width)), var(--studio-box-color) calc(3 * 100% / 9 - var(--box-line-width)), var(--studio-box-color) calc(3 * 100% / 9), transparent calc(3 * 100% / 9)), linear-gradient(to right, transparent calc(6 * 100% / 9 - var(--box-line-width)), var(--studio-box-color) calc(6 * 100% / 9 - var(--box-line-width)), var(--studio-box-color) calc(6 * 100% / 9), transparent calc(6 * 100% / 9)), linear-gradient(to bottom, transparent calc(6 * 100% / 9 - var(--box-line-width)), var(--studio-box-color) calc(6 * 100% / 9 - var(--box-line-width)), var(--studio-box-color) calc(6 * 100% / 9), transparent calc(6 * 100% / 9)), linear-gradient(to right, transparent calc(1 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(1 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(1 * 100% / 9), transparent calc(1 * 100% / 9)), linear-gradient(to bottom, transparent calc(1 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(1 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(1 * 100% / 9), transparent calc(1 * 100% / 9)), linear-gradient(to right, transparent calc(2 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(2 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(2 * 100% / 9), transparent calc(2 * 100% / 9)), linear-gradient(to bottom, transparent calc(2 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(2 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(2 * 100% / 9), transparent calc(2 * 100% / 9)), linear-gradient(to right, transparent calc(4 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(4 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(4 * 100% / 9), transparent calc(4 * 100% / 9)), linear-gradient(to bottom, transparent calc(4 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(4 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(4 * 100% / 9), transparent calc(4 * 100% / 9)), linear-gradient(to right, transparent calc(5 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(5 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(5 * 100% / 9), transparent calc(5 * 100% / 9)), linear-gradient(to bottom, transparent calc(5 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(5 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(5 * 100% / 9), transparent calc(5 * 100% / 9)), linear-gradient(to right, transparent calc(7 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(7 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(7 * 100% / 9), transparent calc(7 * 100% / 9)), linear-gradient(to bottom, transparent calc(7 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(7 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(7 * 100% / 9), transparent calc(7 * 100% / 9)), linear-gradient(to right, transparent calc(8 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(8 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(8 * 100% / 9), transparent calc(8 * 100% / 9)), linear-gradient(to bottom, transparent calc(8 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(8 * 100% / 9 - var(--grid-line-width)), var(--grid-line) calc(8 * 100% / 9), transparent calc(8 * 100% / 9));position:absolute;inset:0}.sudoku-workbench:lang(en) .difficulty-guide-tier{grid-template-columns:76px minmax(0,1fr)}@media (width>=700px) and (orientation:landscape){.sudoku-workbench .workspace:not(.replaying)>#game{align-self:end}.sudoku-workbench .workspace:not(.replaying)>.sidebar{align-self:end;margin-bottom:0}}.sudoku-workbench #studio-learn[hidden]{display:none}.sudoku-workbench #image-adjust[aria-expanded=true]{color:#28698e;background:#dceefa;border-color:#8bb7d2}.sudoku-workbench .footer{flex-wrap:wrap;align-items:center;gap:10px 20px}.sudoku-workbench .feedback-email{color:inherit;font-size:inherit;text-decoration:none}.sudoku-workbench .feedback-email:hover{text-underline-offset:3px;text-decoration:underline}.sudoku-workbench .image-display-tabs{row-gap:6px;container-type:inline-size}.sudoku-workbench #image-display-toggle{isolation:isolate;color:#617a89;width:156px;height:40px;min-height:40px;box-shadow:none;background:#edf3f7;border:1px solid #cddfe9;border-radius:11px;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;padding:3px;line-height:1;display:grid;position:relative}.sudoku-workbench #image-display-toggle:before{content:"";z-index:-1;pointer-events:none;background:#dceefa;border:1px solid #accde3;border-radius:8px;width:calc(50% - 3px);transition:transform .14s;position:absolute;inset:3px auto 3px 3px}.sudoku-workbench #image-display-toggle[aria-checked=false]:before{transform:translate(100%)}.sudoku-workbench #image-display-toggle span{min-width:0;box-shadow:none;color:#617a89;pointer-events:none;background:0 0;border-radius:0;place-items:center;padding:0;font-size:13px;font-weight:500;line-height:1;display:grid}.sudoku-workbench #image-display-toggle span.active{box-shadow:none;color:#225e85;background:0 0;font-weight:600}.sudoku-workbench #image-display-toggle:hover:enabled{background:#e7f0f6;border-color:#a9c9dd}.sudoku-workbench #image-display-toggle:focus-visible{outline-offset:2px;outline:2px solid #7caecc}.sudoku-workbench .image-recognition-option{white-space:normal;min-width:0;padding-right:8px}.sudoku-workbench .image-recognition-option input{accent-color:#397fa8;flex:0 0 14px}@container (width<=360px){.sudoku-workbench .image-display-toggle{grid-area:1/2}.sudoku-workbench .image-recognition-option{grid-area:2/1/auto/-1;padding-right:0}}@media (prefers-reduced-motion:reduce){.sudoku-workbench #image-display-toggle:before{transition:none}}.sudoku-workbench .studio-challenge-head h2{color:#365460;font-size:14px}.sudoku-workbench .board .cell:not(:has(.notes)){padding:0 0 .1em}@media (width<=699px),(orientation:portrait){.sudoku-workbench .header{border-bottom:0;padding-bottom:8px}.sudoku-workbench .workspace{row-gap:0;margin-top:8px}.sudoku-workbench .workspace:not(.replaying) .board-card{border-bottom:0;border-radius:16px 16px 0 0}.sudoku-workbench .workspace:not(.replaying)>.sidebar{margin-top:0;padding-top:0}.sudoku-workbench .workspace:not(.replaying) .input-controls{border-top:0;border-radius:0 0 16px 16px;padding-top:8px}.sudoku-workbench .input-controls .keypads{gap:24px;width:100%;margin-inline:auto;padding-inline:8px}}.sudoku-workbench .site-info-open{min-height:0;color:inherit;font:inherit;text-align:left;background:0 0;border:0;padding:0}.sudoku-workbench #rating-dialog .rating-card{background:0 0;border:0;margin:0;padding:0;font-size:14px}.sudoku-workbench #rating-dialog .rating-section h3{font-size:14px}.sudoku-workbench #rating-dialog .rating-usage{flex-wrap:wrap;gap:8px;font-size:13px;display:flex}.sudoku-workbench #rating-dialog .rating-usage>div{color:#365d73;overflow-wrap:anywhere;background:#f2f7fb;border:1px solid #d6e4ec;border-radius:9px;max-width:100%;padding:8px 12px}.sudoku-workbench #rating-dialog .rating-analysis-note{margin-top:12px}.sudoku-workbench #rating-dialog h3{color:#365460;margin:18px 0 8px;font-size:15px}.sudoku-workbench .rating-overview{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;display:grid}.sudoku-workbench .rating-overview>div{background:#f3f8fb;border:1px solid #dce8ee;border-radius:10px;gap:6px;padding:12px;display:grid}.sudoku-workbench .rating-overview span{color:#667b87;font-size:12px}.sudoku-workbench .rating-overview strong{color:#286c87;font-variant-numeric:tabular-nums;font-size:18px}.sudoku-workbench .rating-level-guide{border:1px solid #dce8ee;border-radius:10px;margin-top:16px;padding:12px}.sudoku-workbench .rating-level-guide summary{cursor:pointer;color:#365d73;font-size:14px;font-weight:600}.sudoku-workbench #rating-guide-tiers{margin:12px 0 0}@media (width<=460px){.sudoku-workbench .rating-overview{gap:6px}.sudoku-workbench .rating-overview>div{padding:10px 8px}.sudoku-workbench .rating-overview strong{font-size:16px}}body.sudoku-workbench{flex-direction:column;display:flex}.sudoku-workbench>.shell{flex:1;width:100%}.sudoku-workbench .footer{color:#e5edf2;background:#20343f;border:0;margin:96px 0 0;padding:24px 0 20px;font-size:12px;display:block}.sudoku-workbench .footer-inner{width:100%;max-width:1180px;margin:0 auto;padding-inline:48px}.sudoku-workbench .footer-main{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 24px;display:flex}.sudoku-workbench .footer .site-info-open{align-items:center;gap:10px;font-size:15px;font-weight:600;display:inline-flex}.sudoku-workbench .footer-logo{object-fit:contain;width:46px;height:auto;display:block}.sudoku-workbench .footer .feedback-email{color:#c8d6df}.sudoku-workbench .footer-registration{color:#b6c7d2;text-align:center;width:fit-content;max-width:100%;margin:18px auto 0;font-size:12px;text-decoration:none;display:block}.sudoku-workbench .footer-registration:hover{color:#fff;text-underline-offset:3px;text-decoration:underline}@media (width<=1000px) and (orientation:landscape){.sudoku-workbench .footer-inner{padding-inline:26px}}@media (width<=699px),(orientation:portrait){.sudoku-workbench .footer-inner{max-width:660px;padding-inline:20px}}@media (width<=460px){.sudoku-workbench .footer-inner{padding-inline:15px}}@media (orientation:landscape){.sudoku-workbench .footer-main{flex-direction:column;align-items:flex-start;gap:12px}.sudoku-workbench .footer-registration{text-align:left;margin-left:0;margin-right:0}}.sudoku-workbench .learning-resources{margin-top:64px;container-type:inline-size}.sudoku-workbench .learning-resources>h2{color:#365460;margin:0 0 20px;font-size:20px;font-weight:600}.sudoku-workbench .resource-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;display:grid}.sudoku-workbench .resource-card{color:#365460;background:#edf3f6;border:1px solid #d5e2e9;border-radius:16px;min-width:0;height:248px;padding:0;text-decoration:none;display:block;position:relative;overflow:hidden}.sudoku-workbench .resource-media{position:absolute;inset:0;overflow:hidden}.sudoku-workbench .resource-media img{object-fit:contain;width:100%;height:100%;padding:36px 16px 106px;display:block}.sudoku-workbench .resource-media-photo img{object-fit:cover;padding:0}.sudoku-workbench .resource-card-top{z-index:1;position:absolute;top:12px;left:12px}.sudoku-workbench .resource-category{color:#416a80;background:#f0f6fa;border:1px solid #d6e5ed;border-radius:7px;padding:5px 9px;font-size:11px;line-height:1.4;display:block}.sudoku-workbench .resource-content{background:#eff6fa;border-top:1px solid #f8fcff;padding:12px 16px 13px;position:absolute;inset:auto 0 0}.sudoku-workbench .resource-card h3{-webkit-line-clamp:2;color:#2c4d60;-webkit-box-orient:vertical;margin:0;font-size:16px;font-weight:600;line-height:1.4;display:-webkit-box;overflow:hidden}.sudoku-workbench .resource-card p{color:#526e7d;white-space:nowrap;text-overflow:ellipsis;margin:5px 0;font-size:12px;line-height:1.5;overflow:hidden}.sudoku-workbench .resource-source{color:#6a8290;white-space:nowrap;text-overflow:ellipsis;font-size:11px;line-height:1.5;overflow:hidden}.sudoku-workbench .resource-card:focus-visible{outline-offset:3px;outline:2px solid #83afc5}@media (hover:hover){.sudoku-workbench .resource-card:hover{border-color:#8eb3c7}}@container (width<=719px){.sudoku-workbench .resource-grid{grid-template-columns:minmax(0,1fr)}}@media (orientation:portrait){.sudoku-workbench .resource-grid{grid-template-columns:minmax(0,1fr)}}@media (width<=699px),(orientation:portrait){.sudoku-workbench .learning-resources{margin-top:48px}.sudoku-workbench .learning-resources>h2{margin-bottom:16px;font-size:18px}.sudoku-workbench .resource-grid{gap:14px}.sudoku-workbench .resource-card{height:224px}.sudoku-workbench .resource-content{padding:11px 14px 12px}}.sudoku-workbench dialog.dialog-shell{--dialog-width:460px;width:min(var(--dialog-width),calc(100vw - 32px));overscroll-behavior:contain;max-height:calc(100dvh - 32px);color:var(--ink);background:#fff;border:1px solid #d8e3e8;border-radius:16px;padding:22px;overflow:auto;box-shadow:0 24px 70px #183b4b29}.sudoku-workbench .dialog-shell,.sudoku-workbench .dialog-shell *{scrollbar-width:none}.sudoku-workbench .dialog-shell::-webkit-scrollbar{width:0;height:0;display:none}.sudoku-workbench .dialog-shell ::-webkit-scrollbar{width:0;height:0;display:none}.sudoku-workbench dialog.dialog-shell::backdrop{-webkit-backdrop-filter:none;backdrop-filter:none;background:#21384566}.sudoku-workbench .dialog-shell .dialog-header{z-index:auto;background:0 0;border-bottom:1px solid #e2eaee;justify-content:space-between;align-items:center;gap:16px;margin:0 0 16px;padding:4px 0 14px;display:flex;position:static;inset:auto}.sudoku-workbench .dialog-shell .dialog-header h2{min-width:0;margin:0;font-size:20px}.sudoku-workbench .dialog-shell .dialog-header.import-header{gap:8px;display:grid}.sudoku-workbench .dialog-shell p{color:#667b87;font-size:14px;line-height:1.8}.sudoku-workbench :where(.dialog-shell) button,.sudoku-workbench :where(.dialog-shell) .secondary{border-radius:9px;min-height:44px;font-size:14px}.sudoku-workbench .dialog-shell .primary{color:#fff;background:#287a70;border:1px solid #287a70}.sudoku-workbench .dialog-shell .secondary{color:#446675;background:#fff;border-color:#d4e1e8}.sudoku-workbench .dialog-shell .wb-icon-close{color:#617b89;background:#f7fafb;border:1px solid #dce5e9;border-radius:10px;flex:0 0 42px;place-items:center;width:42px;min-width:42px;height:42px;min-height:42px;padding:0;display:grid}.sudoku-workbench .dialog-shell .wb-icon-close:hover{background:#eaf1f5;border-color:#c1d3dd}.wb-icon-close svg{width:18px;height:18px}#rating-dialog.dialog-shell,#studio-guide.dialog-shell{--dialog-width:760px}#difficulty-guide.dialog-shell{--dialog-width:780px}#share-dialog.dialog-shell{--dialog-width:900px}#import-dialog.dialog-shell{--dialog-width:1240px}@media (width<=760px){.sudoku-workbench dialog.dialog-shell{padding:16px}}@media (width<=460px){.sudoku-workbench .dialog-shell .dialog-header h2{font-size:18px}}@media (prefers-reduced-motion:no-preference){.sudoku-workbench dialog.dialog-shell{opacity:0;transition:opacity .16s ease,transform .16s ease,display .16s allow-discrete,overlay .16s allow-discrete;transform:translateY(10px)scale(.99)}.sudoku-workbench dialog.dialog-shell[open]{opacity:1;transform:none}.sudoku-workbench dialog.dialog-shell::backdrop{opacity:0;transition:opacity .16s ease,display .16s allow-discrete,overlay .16s allow-discrete}.sudoku-workbench dialog.dialog-shell[open]::backdrop{opacity:1}@starting-style{.sudoku-workbench dialog.dialog-shell[open]{opacity:0;transform:translateY(10px)scale(.99)}.sudoku-workbench dialog.dialog-shell[open]::backdrop{opacity:0}}}