:root{--page:#f6f8fb;--surface:#fff;--surface-raised:#fbfcfe;--ink:#182231;--ink-soft:#324155;--muted:#697386;--line:#d7dfeb;--line-soft:#e7edf5;--line-strong:#1d2a3d;--blue:#2f6fde;--blue-dark:#2459b9;--blue-soft:#e6efff;--green:#188b6f;--green-soft:#def4ee;--amber:#b77912;--amber-soft:#fff0c9;--red:#c33838;--red-soft:#ffe2e2;--cell:#fff;--cell-fixed:#eef3f9;--shadow-sm:0 1px 2px #1822310f;--shadow-md:0 16px 38px #1822311a;--radius:8px;color:var(--ink);background:var(--page);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--page);min-width:320px;margin:0}button,a{font:inherit}button{cursor:pointer}.site-header{z-index:20;border-bottom:1px solid var(--line-soft);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#f6f8fbf0;justify-content:space-between;align-items:center;gap:24px;padding:14px 36px;display:flex;position:sticky;top:0}.brand{color:var(--ink);letter-spacing:0;white-space:nowrap;align-items:center;gap:10px;font-size:1.05rem;font-weight:850;text-decoration:none;display:inline-flex}.brand-mark{border-radius:var(--radius);width:36px;height:36px;color:var(--blue);box-shadow:var(--shadow-sm);background:#edf4ff;border:1px solid #cad8ed;place-items:center;display:grid}.brand-mark svg,.icon-button svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:2px;width:22px;height:22px}.top-nav{align-items:center;gap:20px;padding-bottom:2px;display:flex;overflow-x:auto}.top-nav a{color:var(--muted);letter-spacing:0;white-space:nowrap;font-size:.95rem;font-weight:750;text-decoration:none}.top-nav a:hover{color:var(--blue-dark)}main{width:100%}.game-shell{width:min(1240px,100% - 40px);margin:26px auto 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16px;font-weight:800}.difficulty-button.is-active,.primary-button{border-color:var(--blue);color:#fff;background:var(--blue)}.difficulty-button:hover,.secondary-button:hover{border-color:var(--blue);color:var(--blue-dark)}.primary-button:hover{background:var(--blue-dark)}.play-layout{grid-template-columns:minmax(440px,1fr) minmax(270px,318px) minmax(220px,272px);align-items:start;gap:18px;display:grid}.board-panel,.control-panel,.side-panel>section{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-md)}.board-panel{padding:16px}.status-strip{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-bottom:14px;display:grid}.status-strip>div{border:1px solid var(--line-soft);border-radius:var(--radius);background:var(--surface-raised);min-width:0;padding:10px 12px}.status-label{color:var(--muted);letter-spacing:0;margin-bottom:4px;font-size:.75rem;font-weight:800;display:block}.status-strip strong{color:var(--ink);font-size:1.05rem}.sudoku-board{aspect-ratio:1;border:3px solid var(--line-strong);background:var(--line-strong);width:min(100%,604px);box-shadow:inset 0 0 0 1px var(--line-strong);grid-template-columns:repeat(9,1fr);margin:0 auto;display:grid}.cell{border:1px solid var(--line);min-width:0;min-height:0;color:var(--blue);background:var(--cell);border-radius:0;place-items:center;font-size:2.25rem;font-weight:780;line-height:1;display:grid;position:relative}.cell:nth-child(3n){border-right-color:var(--line-strong)}.cell:nth-child(9n){border-right-color:var(--line)}.cell:nth-child(n+19):nth-child(-n+27),.cell:nth-child(n+46):nth-child(-n+54){border-bottom-color:var(--line-strong)}.cell.is-fixed{color:var(--ink);background:var(--cell-fixed)}.cell.is-selected{background:var(--amber-soft);outline:3px solid var(--amber);outline-offset:-3px}.cell.is-peer{background:var(--blue-soft)}.cell.is-same{background:var(--green-soft)}.cell.is-invalid{color:var(--red);background:var(--red-soft)}.notes{color:#4b6da7;grid-template-columns:repeat(3,1fr);width:100%;height:100%;padding:4px;font-size:.78rem;font-weight:800;display:grid}.notes span{place-items:center;display:grid}.board-message{min-height:24px;color:var(--muted);text-align:center;margin-top:12px;font-weight:750}.control-panel{padding:14px}.tool-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-bottom:12px;display:grid}.icon-button{border:1px solid 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h2{font-size:1.55rem}.mini-board{border:2px solid var(--line-strong);background:var(--line-strong);grid-template-columns:repeat(3,1fr);width:74px;height:74px;display:grid}.mini-board span{border:1px solid var(--line);color:var(--blue);background:#fff;place-items:center;font-size:.95rem;font-weight:900;display:grid}.compact-copy{color:var(--muted);margin:8px 0 0;font-size:.95rem;line-height:1.4}.stat-card,.ad-card{padding:16px}.stat-card strong{color:var(--ink-soft);letter-spacing:0;font-size:1.9rem;display:block}.ad-card{min-height:178px;color:var(--muted);text-align:center;background:var(--surface-raised);place-items:center;display:grid}.ad-card span{width:42px;height:42px;color:var(--amber);background:var(--amber-soft);border:1px solid #efd18d;border-radius:50%;place-items:center;font-weight:900;display:grid}.ad-card p{margin:0;font-weight:800}.content-band{border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft);background:#fff}.content-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:22px;width:min(1240px,100% - 40px);margin:0 auto;padding:42px 0;display:grid}.content-grid article{min-width:0;padding-top:2px}.content-grid p,.seo-copy p{color:var(--muted);font-size:1rem;line-height:1.7}.seo-section{width:min(940px,100% - 40px);margin:0 auto;padding:50px 0 66px}.keyword-cloud{flex-wrap:wrap;gap:10px;margin-top:22px;display:flex}.keyword-cloud a{border:1px solid var(--line);border-radius:var(--radius);color:var(--ink);background:var(--surface);box-shadow:var(--shadow-sm);padding:9px 12px;font-weight:800;text-decoration:none}.keyword-cloud a:hover{border-color:var(--green);color:var(--green)}.site-footer{border-top:1px solid var(--line-soft);flex-wrap:wrap;justify-content:center;gap:18px;padding:28px 16px 42px;display:flex}.site-footer a{color:var(--muted);font-weight:800;text-decoration:none}.site-footer a:hover{color:var(--blue-dark)}.article-shell{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);width:min(920px,100% - 40px);box-shadow:var(--shadow-md);margin:34px auto 64px;padding:42px}.article-shell h1{margin-bottom:18px}.article-shell h2{margin-top:32px;font-size:1.75rem}.article-shell p,.article-shell li{color:var(--muted);line-height:1.75}.article-shell ul,.article-shell ol{padding-left:20px}.breadcrumbs{color:var(--muted);flex-wrap:wrap;gap:8px;margin-bottom:22px;font-size:.88rem;font-weight:800;display:flex}.breadcrumbs a{color:var(--blue-dark);text-decoration:none}.breadcrumbs a:hover{text-decoration:underline}.article-links{flex-wrap:wrap;gap:10px;margin-top:24px;display:flex}.feature-strip{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:22px 0 6px;display:grid}.feature-strip strong,.contact-panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-raised);min-width:0;box-shadow:var(--shadow-sm);padding:13px 14px}.feature-strip strong{color:var(--ink-soft);font-size:.92rem}.faq-list{gap:10px;margin-top:16px;display:grid}.faq-list details{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-raised);padding:14px 16px}.faq-list summary{color:var(--ink);cursor:pointer;font-weight:850}.faq-list p{margin-bottom:0}.contact-panel{gap:6px;margin:22px 0 8px;display:grid}.contact-panel span{color:var(--muted);text-transform:uppercase;font-size:.78rem;font-weight:850}.contact-panel a{color:var(--blue-dark);overflow-wrap:anywhere;font-size:1.2rem;font-weight:850;text-decoration:none}.rule-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:24px 0 6px;display:grid}.rule-grid article{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-raised);padding:16px}.rule-grid h2{margin-top:0;font-size:1.2rem}.growth-table{border:1px solid var(--line);border-radius:var(--radius);margin:24px 0 8px;display:grid;overflow:hidden}.growth-table>div{border-top:1px solid var(--line-soft);grid-template-columns:1.05fr 1fr 1.4fr .7fr;gap:0;display:grid}.growth-table>div:first-child{background:var(--cell-fixed);border-top:0}.growth-table span,.growth-table strong{overflow-wrap:anywhere;min-width:0;padding:12px}.daily-hero{border-radius:var(--radius);background:#fffaf0;border:1px solid #e8d4a8;justify-content:space-between;align-items:center;gap:20px;margin:28px 0 34px;padding:22px;display:flex}.daily-hero h2{margin-top:0}.puzzle-meta{text-transform:capitalize;margin:8px 0 0;font-weight:800}.archive-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:18px;display:grid}.archive-item{border:1px solid var(--line);border-radius:var(--radius);min-width:0;color:var(--ink);background:var(--surface-raised);box-shadow:var(--shadow-sm);gap:4px;padding:14px;text-decoration:none;display:grid}.archive-item:hover{border-color:var(--blue);color:var(--blue-dark)}.archive-item span,.archive-item small{color:var(--muted);text-transform:capitalize;font-weight:800}.archive-item strong{overflow-wrap:anywhere}.archive-month h2{margin-top:34px}.solver-tool{grid-template-columns:minmax(320px,460px) minmax(260px,1fr);gap:18px;margin:28px 0 10px;display:grid}.solver-grid,.solution-grid,.print-grid{border:3px solid var(--line-strong);background:var(--line-strong);grid-template-columns:repeat(9,1fr);display:grid}.solver-grid{aspect-ratio:1;width:min(100%,460px)}.solver-cell,.solution-grid span{border:1px solid var(--line);min-width:0;min-height:0;color:var(--blue);background:var(--cell);text-align:center;border-radius:0;place-items:center;font-size:1.5rem;font-weight:850;line-height:1;display:grid}.solver-cell{width:100%;height:100%}.solver-cell:focus{z-index:1;outline:3px solid var(--amber);outline-offset:-3px}.solver-cell:nth-child(3n),.solution-grid span:nth-child(3n){border-right-color:var(--line-strong)}.solver-cell:nth-child(9n),.solution-grid span:nth-child(9n){border-right-color:var(--line)}.solver-cell:nth-child(n+19):nth-child(-n+27),.solver-cell:nth-child(n+46):nth-child(-n+54),.solution-grid span:nth-child(n+19):nth-child(-n+27),.solution-grid span:nth-child(n+46):nth-child(-n+54){border-bottom-color:var(--line-strong)}.solver-panel,.print-page{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-raised);padding:16px}.solver-label{color:var(--ink-soft);margin-bottom:8px;font-weight:850;display:block}.solver-textarea{resize:vertical;border:1px solid var(--line);border-radius:var(--radius);width:100%;color:var(--ink);background:var(--surface);font:inherit;padding:12px;line-height:1.5}.solver-actions,.print-toolbar{flex-wrap:wrap;gap:10px;margin-top:12px;display:flex}.solver-status{min-height:28px;color:var(--ink-soft);margin:14px 0;font-weight:800}.solution-grid{aspect-ratio:1;width:min(100%,320px);margin:12px 0}.solution-grid span{font-size:1rem}.solution-grid .is-given{color:var(--ink);background:var(--cell-fixed)}.printable-pack{margin:28px 0 8px}.print-pages{gap:18px;margin-top:18px;display:grid}.print-page{break-inside:avoid}.print-page header{justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:14px;display:flex}.print-page header p:last-child{color:var(--muted);margin:0;font-weight:850}.print-grid{border-collapse:collapse;border:3px solid var(--line-strong);background:var(--surface);width:min(100%,520px);display:table}.print-grid td{aspect-ratio:1;border:1px solid var(--line);width:11.111%;color:var(--ink);text-align:center;vertical-align:middle;font-size:1.45rem;font-weight:850}.print-grid tr:nth-child(3n) td{border-bottom-color:var(--line-strong)}.print-grid tr:last-child td{border-bottom-color:var(--line)}.print-grid td:nth-child(3n){border-right-color:var(--line-strong)}.print-grid td:last-child{border-right-color:var(--line)}.answer-key{margin-top:18px}.answer-key h3{margin:0 0 10px}.print-grid.is-answer{width:min(100%,320px)}.print-grid.is-answer td{font-size:1rem}.result-dialog{border:1px solid var(--line);border-radius:var(--radius);width:min(420px,100% - 32px);box-shadow:var(--shadow-md);padding:24px}.result-dialog::backdrop{background:#0f172a73}.result-art{color:var(--green)}.result-art svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:4px;width:120px;height:80px}.result-dialog p{color:var(--muted);line-height:1.6}.dialog-actions{justify-content:end;gap:10px;display:flex}@media (max-width:1080px){.play-layout{grid-template-columns:minmax(360px,1fr) minmax(250px,320px)}.side-panel{grid-column:1/-1;grid-template-columns:repeat(3,minmax(0,1fr))}}@media (max-width:780px){.site-header,.game-topline{flex-direction:column;align-items:start}.site-header{gap:12px;padding:13px 16px}.top-nav{width:100%}h1{font-size:2.7rem}h2{font-size:1.45rem}.play-layout,.content-grid,.side-panel,.solver-tool,.feature-strip,.rule-grid{grid-template-columns:1fr}.game-shell{width:min(100% - 18px,620px);margin-top:16px}.board-panel,.control-panel{padding:12px}.status-strip{grid-template-columns:repeat(3,minmax(0,1fr))}.status-strip strong{font-size:.9rem}.sudoku-board{border-width:2px}.cell{font-size:1.75rem}.tool-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.icon-button{min-height:62px}.icon-button span{display:none}.number-button{min-height:58px;font-size:1.7rem}.content-grid{width:min(100% - 32px,620px);padding:34px 0}.seo-section{width:min(100% - 32px,620px)}}@media (max-width:430px){.brand{font-size:1rem}.status-strip{gap:6px}.status-strip>div{padding:8px}.status-label{font-size:.68rem}.cell{font-size:1.45rem}.notes{padding:2px;font-size:.5rem}.daily-card{grid-template-columns:66px minmax(0,1fr)}.mini-board{width:66px;height:66px}.action-row{grid-template-columns:1fr}.article-shell{width:min(100% - 24px,620px);padding:26px}.daily-hero,.archive-grid,.growth-table>div,.print-page header{grid-template-columns:1fr}.daily-hero,.print-page header{flex-direction:column;align-items:start}}@media print{.site-header,.site-footer,.print-toolbar,.article-links,.article-shell>p,.article-shell>h1,.article-shell>h2{display:none}body{background:#fff}.article-shell{width:100%;box-shadow:none;border:0;margin:0;padding:0}.print-page{page-break-after:always;border:0}}