:root{--paper:#f6f5ef;--ink:#263c31;--green:#315b47;--muted:#797d70;--line:#e5e5dc;--soft:#edf1e9;--gold:#d4a35d;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;color:inherit}a{color:inherit}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--gold);outline-offset:3px}.header{max-width:1120px;margin:auto;height:105px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:0 25px}.wordmark{text-decoration:none;font-size:30px;font-weight:750;letter-spacing:-1.5px;display:block;line-height:1}.brand-name{display:block}.brand-tagline{display:block;font-size:11px;font-weight:400;letter-spacing:.2px;line-height:1.2;margin-top:7px;color:var(--muted)}.header-note{font-size:13px;color:var(--muted)}main{max-width:1000px;margin:auto;padding:0 25px}.intro{text-align:center;padding:46px 0 34px}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2px;display:flex;align-items:center;justify-content:center;gap:8px}.eyebrow span{height:6px;width:6px;background:var(--gold);border-radius:100%}h1{font:normal 44px/1.15 Georgia,'Times New Roman',serif;letter-spacing:-1.5px;margin:16px 0 13px}.intro p{color:var(--muted);font-size:14px;margin:0}.layout{display:grid;grid-template-columns:minmax(0,548px) minmax(0,300px);gap:42px;justify-content:center;align-items:start}.puzzle-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px;box-shadow:0 5px 20px #2b342507}.puzzle-top{display:flex;justify-content:space-between;gap:12px;align-items:center}.puzzle-top h2{font-size:16px;font-weight:600;margin:0 0 7px}.puzzle-top time{font-size:12px;color:var(--muted)}.level{font-size:10px;font-weight:600;background:var(--soft);color:var(--green);padding:7px 10px;border-radius:20px;white-space:nowrap}.game-meta{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin:24px 0 12px}.timer{font-variant-numeric:tabular-nums}.board{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));grid-template-rows:repeat(9,minmax(0,1fr));aspect-ratio:1;border:2px solid var(--ink);background:var(--ink);gap:0;overflow:visible;border-radius:3px}.cell{padding:0;border:0;border-right:1px solid #d9ddd5;border-bottom:1px solid #d9ddd5;background:#fff;display:flex;align-items:center;justify-content:center;position:relative;font-size:clamp(19px,3vw,27px);font-weight:400;min-width:0;min-height:0;color:#46755f;touch-action:manipulation}.cell:nth-child(3n){border-right:2px solid var(--ink)}.cell:nth-child(9n){border-right:0}.cell:nth-child(n+19):nth-child(-n+27),.cell:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid var(--ink)}.cell:nth-child(n+73){border-bottom:0}.cell.given{color:var(--ink);font-weight:600;background:#fafbf7}.cell.related{background:#f0f3ed}.cell.match{background:#e4ecdf}.cell.selected{background:#dce8d3;z-index:1}.cell.conflict{color:#b24839;background:#faeae5}.cell:focus-visible{outline:none;z-index:1}.cell .pencil{position:absolute;inset:3px;padding:0;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);font-size:10px;color:#75816b;align-items:center}.print-value{display:none}.game-status{min-height:42px;padding:13px 0 8px;text-align:center;font-size:11px;color:var(--muted)}.keypad{display:grid;grid-template-columns:repeat(9,1fr);gap:6px}.keypad button{border:1px solid var(--line);border-radius:7px;background:var(--paper);height:43px;font-size:21px;color:var(--green)}.keypad button:hover{background:#e6ecdf}.game-tools{display:grid;grid-template-columns:repeat(4,1fr);padding:18px 0 17px;gap:4px}.tool{border:0;background:none;font-size:20px;border-radius:6px;padding:6px 0;display:flex;flex-direction:column;align-items:center;gap:7px}.tool span{font-size:10px;color:var(--muted)}.tool:hover,.tool[aria-pressed=true]{background:var(--soft)}button:disabled{opacity:.35;cursor:default}.puzzle-bottom{border-top:1px solid var(--line);padding-top:16px;display:flex;justify-content:space-between;gap:8px;font-size:9px;color:var(--muted);align-items:center}.puzzle-bottom button{border:0;background:none;font-size:10px;color:var(--muted);text-decoration:underline;padding:2px}.saved-dot{display:inline-block;width:5px;height:5px;background:#8ca881;border-radius:50%;margin-right:4px}.sidebar{padding-top:20px}.small-label{font-size:9px;letter-spacing:1.8px;color:var(--muted);font-weight:600}.welcome h2{font:normal 37px/1.16 Georgia,serif;letter-spacing:-1px;margin:17px 0}.welcome p,.how-to p{font-size:13px;line-height:1.8;color:var(--muted)}.side-actions{display:flex;flex-direction:column;gap:10px;margin-top:24px}.side-actions button{border-radius:7px;display:flex;justify-content:center;align-items:center;gap:9px;font-size:12px;height:44px}.side-actions svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}.primary{background:var(--green);color:#fff;border:1px solid var(--green)}.primary:hover{background:#254735}.secondary{background:transparent;border:1px solid #d7dace}.secondary:hover{background:var(--soft)}.welcome .next-puzzle{font-size:10px;text-align:center;margin-top:14px}.how-to{border-top:1px solid var(--line);padding-top:22px;margin-top:30px}.how-to h3{font-size:13px;margin:0}.how-to p{font-size:12px;margin:10px 0}.how-to summary{font-size:11px;cursor:pointer;color:var(--green);padding:6px 0}.advertisement{margin-top:29px;border:1px solid #dedfd2;border-radius:9px;background:#edeee4;padding:19px}.ad-label{font-size:8px;color:#8a8e7e;letter-spacing:1.8px}.ad-title{font:normal 23px/1.2 Georgia,serif;margin:17px 0 9px}.ad-copy{font-size:11px;line-height:1.7;color:var(--muted);margin-bottom:0}.ad-link{display:inline-block;margin-top:14px;font-size:11px;color:var(--green)}.closing{font-size:12px;color:var(--muted);display:flex;align-items:center;justify-content:center;gap:10px;margin:35px 0 40px}.closing span{color:var(--gold);font-size:22px}footer{max-width:1070px;margin:0 auto;padding:23px 0 28px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:15px;align-items:center;font-size:10px;color:var(--muted)}.footer-brand{font-weight:700;font-size:15px;text-decoration:none;color:var(--green);letter-spacing:-.5px}noscript{display:block;text-align:center;padding:30px}@media(min-width:1400px){.intro{padding-top:60px;padding-bottom:42px}}@media(max-width:800px){.layout{gap:24px;grid-template-columns:minmax(0,500px) minmax(0,240px)}.puzzle-card{padding:18px}.sidebar{padding-top:15px}footer{margin:0 25px}.welcome h2{font-size:32px}}@media(max-width:660px){.header{height:77px;margin:0 20px;padding:0}.wordmark{font-size:26px}.header-note{font-size:10px}main{padding:0 16px}.intro{padding:30px 0 25px}h1{font-size:34px}.intro p{font-size:12px}.eyebrow{font-size:8px;letter-spacing:1.6px}.layout{grid-template-columns:minmax(0,460px);gap:25px}.puzzle-card{padding:17px}.puzzle-top h2{font-size:14px}.cell{font-size:25px}.keypad{gap:4px}.keypad button{height:42px;font-size:21px}.sidebar{padding:0 7px}.welcome h2,.welcome>.small-label,.welcome>p:not(.next-puzzle){display:none}.side-actions{margin-top:0;display:grid;grid-template-columns:1fr 1fr;gap:8px}.side-actions button{font-size:11px;gap:6px}.how-to{margin-top:22px}.advertisement{margin-top:20px}.closing{font-size:11px;margin:28px 0}footer{margin:0 23px;flex-wrap:wrap;font-size:9px}footer>span:last-child{display:none}}@media(prefers-reduced-motion:no-preference){button{transition:background .12s}}@media print{@page{size:A4;margin:20mm}:root,body{background:#fff;color:#000}.header{height:auto;border:0;padding:0;margin:0 0 20px;max-width:none}.header-note,.intro,.sidebar,.game-meta,.game-status,.keypad,.game-tools,.puzzle-bottom,.closing,footer,noscript{display:none!important}main{padding:0;max-width:none}.layout{display:block}.puzzle-card{padding:0;border:0;box-shadow:none;max-width:160mm;margin:auto}.puzzle-top{margin-bottom:20px}.puzzle-top h2{font-size:20px}.puzzle-top time{color:#000}.level{background:none;border:1px solid #aaa}.board{width:160mm;height:160mm;border-color:#000}.cell,.cell.given,.cell.related,.cell.selected,.cell.conflict,.cell.match{background:#fff!important;box-shadow:none!important;outline:none!important;color:#000!important;border-color:#777;border-radius:0}.cell:nth-child(3n),.cell:nth-child(n+19):nth-child(-n+27),.cell:nth-child(n+46):nth-child(-n+54){border-color:#000}.screen-value,.pencil{display:none!important}.print-value{display:block;font-size:25px}.puzzle-card:after{content:'Vul elke rij, kolom en elk blok met 1 tot en met 9. Veel puzzelplezier!   •   sudokutje.nl';display:block;margin-top:20px;font-size:11px;text-align:center}}

.cell .pencil[hidden]{display:none}

/* Center the selection on the shared grid lines, including block boundaries. */
.cell{--edge-left:1px;--edge-top:1px;--edge-right:1px;--edge-bottom:1px}
.cell:nth-child(9n+1){--edge-left:2px}
.cell:nth-child(9n+4),.cell:nth-child(9n+7){--edge-left:2px}
.cell:nth-child(3n){--edge-right:2px}
.cell:nth-child(9n){--edge-right:2px}
.cell:nth-child(-n+9){--edge-top:2px}
.cell:nth-child(n+28):nth-child(-n+36),.cell:nth-child(n+55):nth-child(-n+63){--edge-top:2px}
.cell:nth-child(n+19):nth-child(-n+27),.cell:nth-child(n+46):nth-child(-n+54){--edge-bottom:2px}
.cell:nth-child(n+73){--edge-bottom:2px}
.cell.selected::after,.cell:focus-visible::after{content:"";position:absolute;pointer-events:none;left:calc(var(--edge-left) / -2);top:calc(var(--edge-top) / -2);right:calc(var(--edge-right) / -2);bottom:calc(var(--edge-bottom) / -2);outline:2px solid var(--green);outline-offset:-1px;z-index:2}
@media print{.cell::after{display:none!important}}

/* Edge cells have no own border: reach the center of the board border. */
.cell:nth-child(9n).selected::after,.cell:nth-child(9n):focus-visible::after{right:-1px}
.cell:nth-child(n+73).selected::after,.cell:nth-child(n+73):focus-visible::after{bottom:-1px}