:root{--cell-bg:#fff;--ink:#16283b;--line:#6b7785;--related:#edf3f9;--same:#d4e9f9;--selected:#acd4f3} [data-bs-theme=dark]{--cell-bg:#192735;--ink:#eef4fb;--line:#a5b3c2;--related:#253b50;--same:#315675;--selected:#416f96}body{color:var(--ink);background:var(--bs-body-bg);font-family:system-ui,sans-serif}main{min-height:75vh}a{color:var(--bs-link-color)}.hero{padding:2rem 0}.hero h1{font-size:clamp(2rem,6vw,3.5rem);font-weight:800;max-width:760px}.lead{max-width:700px}.game-layout{display:grid;gap:1.5rem;grid-template-columns:minmax(0,520px) minmax(220px,1fr);max-width:920px;margin:auto}.board-wrap{position:relative}.sudoku-grid{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));width:100%;aspect-ratio:1;border:3px solid var(--ink);background:var(--ink)}.cell{border:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);border-radius:0;padding:0;min-width:0;aspect-ratio:1;background:var(--cell-bg);color:var(--bs-link-color);font-size:clamp(1.2rem,5vw,2rem);display:grid;place-items:center;cursor:pointer}.cell:nth-child(3n){border-right:3px 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:3px solid var(--ink)}.cell:nth-child(n+73){border-bottom:0}.given{font-weight:800;color:var(--ink)}.related{background:var(--related)}.same{background:var(--same)}.selected{background:var(--selected);box-shadow:inset 0 0 0 2px var(--bs-primary)}.error{color:#bc1231;background:#ffe0e5}[data-bs-theme=dark] .error{color:#ffb4c3;background:#532333}.hint{box-shadow:inset 0 0 0 3px #b07800}.notes{display:grid;grid-template-columns:repeat(3,1fr);width:100%;height:100%;font-size:clamp(.55rem,1.8vw,.85rem);color:var(--ink)}.notes span{display:grid;place-items:center}.number-pad{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:3px;margin-top:12px}.number-pad .btn{padding:0;min-height:48px;font-size:1.15rem}.tools{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;margin-top:10px}.tools .btn{min-height:44px;padding:6px}.btn[aria-pressed=true]{background:var(--bs-primary);color:#fff}:focus-visible{outline:3px solid #d58b00!important;outline-offset:2px}.paused{visibility:hidden}#pause-mask{position:absolute;inset:0;display:grid;place-items:center;background:var(--related);font-size:1.5rem} [hidden]{display:none!important}.status{min-height:3rem;margin-top:1rem}.content{max-width:800px}.content h2{margin-top:2rem}.site-nav{display:flex;flex-wrap:wrap;gap:1rem}.theme-control{max-width:130px}dialog{max-width:calc(100% - 24px);width:450px;padding:2rem;border:1px solid var(--line);border-radius:16px;color:var(--ink);background:var(--cell-bg)}dialog::backdrop{background:#0009}.print-sheet{padding:1rem;margin:1rem auto;max-width:800px;border:1px solid var(--line)}.print-group{display:grid;gap:1rem}.per-2 .print-group,.per-4 .print-group{grid-template-columns:repeat(2,minmax(0,1fr))}.print-grid{display:grid;grid-template-columns:repeat(9,1fr);aspect-ratio:1;border:2px solid #111;max-width:450px;margin:auto;background:#fff;color:#111}.print-grid span{display:grid;place-items:center;border-right:1px solid #888;border-bottom:1px solid #888;font-size:clamp(1rem,3vw,1.7rem)}.print-grid span:nth-child(3n){border-right:2px solid #111}.print-grid span:nth-child(9n){border-right:0}.print-grid span:nth-child(n+19):nth-child(-n+27),.print-grid span:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid #111}.print-grid span:nth-child(n+73){border-bottom:0}.print-sheet h3{font-size:.85rem;text-align:center;margin-top:1rem}@media(max-width:700px){.game-layout{grid-template-columns:minmax(0,1fr)}.container{padding-left:12px;padding-right:12px}.site-nav{gap:.65rem}.hero{padding:1rem 0}.per-2 .print-group{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}@page{size:A4;margin:12mm}@media print{body{background:#fff!important;color:#000!important}header,footer,main>h1,main>.intro,.no-print{display:none!important}.container{max-width:none;padding:0}.print-sheet{break-after:page;page-break-after:always;border:0;padding:0;margin:0;height:270mm}.print-sheet:last-child{break-after:auto}.print-group{grid-template-columns:1fr!important}.per-2 .print-grid{width:108mm}.per-4 .print-group{grid-template-columns:repeat(2,1fr)!important}.per-4 .print-grid{width:80mm}.per-1 .print-grid{width:170mm}.print-sheet h2{font-size:16pt}.print-grid span{font-size:16pt}.per-4 .print-grid span{font-size:12pt}a{text-decoration:none}}