/*! tailwindcss v4.3.3 | MIT License | https://tailwindcss.com */
@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,:before,:after,::backdrop{--tw-rotate-x:initial;--tw-rotate-y:initial;--tw-rotate-z:initial;--tw-skew-x:initial;--tw-skew-y:initial;--tw-outline-style:solid}}}@layer theme{:root,:host{--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.invisible{visibility:hidden}.visible{visibility:visible}.sr-only{clip-path:inset(50%);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.fixed{position:fixed}.static{position:static}.grid{display:grid}.hidden{display:none}.transform{transform:var(--tw-rotate-x,) var(--tw-rotate-y,) var(--tw-rotate-z,) var(--tw-skew-x,) var(--tw-skew-y,)}.lowercase{text-transform:lowercase}.outline{outline-style:var(--tw-outline-style);outline-width:1px}}:root{color-scheme:light;--ink:#172033;--muted:#667085;--line:#c8cfda;--line-strong:#24324a;--surface:#fff;--surface-soft:#f5f7fb;--surface-selected:#dce8ff;--surface-peer:#edf3ff;--brand:#2457d6;--brand-strong:#173d9d;--danger:#c53b3b;--success:#177245;--shadow:0 18px 48px #1d2d521f;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}:root[data-font-scale=large]{font-size:112.5%}:root[data-font-scale=extra-large]{font-size:125%}:root[data-high-contrast=true]{--ink:#000;--muted:#303030;--line:#747474;--line-strong:#000;--brand:#003fbd;--surface-peer:#e1e9f8;--surface-selected:#bcd2ff}:root[data-reduced-motion=true] *,:root[data-reduced-motion=true] :before,:root[data-reduced-motion=true] :after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}*{box-sizing:border-box}html{scroll-behavior:smooth;background:#f0f3f8}body{min-height:100vh;color:var(--ink);background:radial-gradient(circle at 0 0,#4870df17,#0000 28rem),linear-gradient(#fafbfe 0%,#f1f4f9 100%);margin:0}a{color:inherit}button,select,input{font:inherit}button{touch-action:manipulation}:focus-visible{outline-offset:3px;outline:3px solid #2457d66b}.sr-only{clip:rect(0, 0, 0, 0)!important;white-space:nowrap!important;border:0!important;width:1px!important;height:1px!important;margin:-1px!important;padding:0!important;position:absolute!important;overflow:hidden!important}.skip-link{z-index:100;color:#fff;background:var(--brand-strong);border-radius:.7rem;padding:.7rem .95rem;font-weight:780;text-decoration:none;transition:transform .16s;position:fixed;inset:.6rem auto auto .6rem;transform:translateY(-180%)}.skip-link:focus{transform:translateY(0)}.site-header{z-index:30;backdrop-filter:blur(16px);background:#ffffffdb;border-bottom:1px solid #24324a1a;position:sticky;top:0}.header-inner,.page-shell,.footer-inner{width:min(1180px,100% - 2rem);margin-inline:auto}.header-inner{justify-content:space-between;align-items:center;gap:1rem;min-height:4.25rem;display:flex}.brand{flex:none;align-items:center;text-decoration:none;display:inline-flex}.brand-logo{width:clamp(9.6rem,22vw,14rem);height:auto;display:block}.site-nav{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:.15rem;display:flex}.site-nav a{color:var(--muted);border-radius:.65rem;padding:.6rem .75rem;font-size:.92rem;font-weight:650;text-decoration:none}.site-nav a:hover{color:var(--ink);background:var(--surface-soft)}.page-shell{padding-block:2rem 4rem}.hero{text-align:center;padding:clamp(2.25rem,6vw,5.5rem) 0 2.5rem}.eyebrow{color:var(--brand-strong);background:#dce8ff8c;border:1px solid #2457d62e;border-radius:999px;align-items:center;gap:.4rem;padding:.4rem .7rem;font-size:.84rem;font-weight:750;display:inline-flex}.hero h1{letter-spacing:-.065em;max-width:820px;margin:1rem auto .9rem;font-size:clamp(2.6rem,8vw,5.6rem);line-height:.98}.hero p{max-width:680px;color:var(--muted);margin:0 auto;font-size:clamp(1rem,2vw,1.22rem);line-height:1.75}.hero-actions{flex-wrap:wrap;justify-content:center;gap:.75rem;margin-top:1.6rem;display:flex}.button{cursor:pointer;border:1px solid #0000;border-radius:.8rem;justify-content:center;align-items:center;gap:.45rem;min-height:2.8rem;padding:.72rem 1rem;font-weight:760;text-decoration:none;transition:transform .16s,background .16s,border-color .16s;display:inline-flex}.button:hover{transform:translateY(-1px)}.button-primary{color:#fff;background:var(--brand);box-shadow:0 8px 24px #2457d63d}.button-primary:hover{background:var(--brand-strong)}.button-secondary{background:var(--surface);color:var(--ink);border-color:#24324a29}.button-quiet{color:var(--muted);background:0 0;border-color:#24324a1f}.button:disabled{opacity:.42;cursor:not-allowed;transform:none}.section-title{letter-spacing:-.035em;margin:0 0 .4rem;font-size:clamp(1.55rem,3vw,2.15rem)}.section-copy{color:var(--muted);margin:0 0 1.4rem;line-height:1.7}.difficulty-grid{grid-template-columns:repeat(4,1fr);gap:1rem;display:grid}.difficulty-card{background:var(--surface);border:1px solid #24324a1a;border-radius:1.2rem;min-height:13rem;padding:1.35rem;text-decoration:none;transition:transform .18s,box-shadow .18s;display:block;position:relative;overflow:hidden;box-shadow:0 10px 30px #1d2d5212}.difficulty-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}.difficulty-card:after{content:"";aspect-ratio:1;background:#2457d614;border-radius:50%;width:7rem;position:absolute;bottom:-2rem;right:-2rem}.difficulty-card strong{margin-bottom:.45rem;font-size:1.25rem;display:block}.difficulty-card p{color:var(--muted);margin:0;line-height:1.6}.card-number{color:var(--brand);letter-spacing:.12em;margin-bottom:1.4rem;font-size:.78rem;font-weight:850;display:block}.feature-grid{grid-template-columns:1.2fr 1fr 1fr;gap:1rem;margin-top:3.5rem;display:grid}.feature-card{background:#ffffffb8;border:1px solid #24324a17;border-radius:1.15rem;padding:1.4rem}.feature-card h3{margin:0 0 .45rem;font-size:1.08rem}.feature-card p{color:var(--muted);margin:0;line-height:1.65}.daily-card{color:#fff;background:linear-gradient(135deg,#173d9d,#2f6be8)}.daily-card p{color:#ffffffc2}.daily-card .button{color:#173d9d;background:#fff;margin-top:1rem}.game-page{width:min(1080px,100% - 1rem);margin-inline:auto;padding:1.25rem 0 4rem}.game-topbar{justify-content:space-between;align-items:center;gap:1rem;margin-bottom:1rem;display:flex}.game-title-group h1{letter-spacing:-.04em;margin:0;font-size:clamp(1.45rem,4vw,2.1rem)}.game-title-group p{color:var(--muted);margin:.25rem 0 0}.game-meta{align-items:center;gap:.6rem;display:flex}.meta-pill{background:var(--surface);text-align:center;border:1px solid #24324a1f;border-radius:.8rem;min-width:5.4rem;padding:.55rem .75rem}.meta-pill small{color:var(--muted);text-transform:uppercase;letter-spacing:.08em;font-size:.68rem;font-weight:800;display:block}.meta-pill strong{font-variant-numeric:tabular-nums;margin-top:.1rem;display:block}.game-layout{grid-template-columns:minmax(0,1fr) 18rem;align-items:start;gap:1.4rem;display:grid}.board-panel{background:var(--surface);box-shadow:var(--shadow);border:1px solid #24324a1f;border-radius:1.25rem;padding:clamp(.45rem,2vw,1rem);position:relative}.sudoku-board{border:3px solid var(--line-strong);background:var(--line);-webkit-user-select:none;user-select:none;grid-template-columns:repeat(9,1fr);width:100%;max-width:36rem;margin-inline:auto;display:grid}.sudoku-cell{aspect-ratio:1;border:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);min-width:0;color:var(--brand-strong);background:var(--surface);cursor:pointer;font-variant-numeric:tabular-nums;place-items:center;padding:0;font-size:clamp(1.15rem,4.5vw,2rem);font-weight:620;display:grid;position:relative}.sudoku-cell:nth-child(9n){border-right:0}.sudoku-cell:nth-last-child(-n+9){border-bottom:0}.sudoku-cell:nth-child(9n+3),.sudoku-cell:nth-child(9n+6){border-right:3px solid var(--line-strong)}.sudoku-cell:nth-child(n+19):nth-child(-n+27),.sudoku-cell:nth-child(n+46):nth-child(-n+54){border-bottom:3px solid var(--line-strong)}.sudoku-cell.is-given{color:var(--ink);cursor:default;font-weight:820}.sudoku-cell.is-peer{background:var(--surface-peer)}.sudoku-cell.is-same{background:#e1ecff}.sudoku-cell.is-selected{z-index:1;background:var(--surface-selected);box-shadow:inset 0 0 0 3px var(--brand)}.sudoku-cell.is-wrong{color:var(--danger);background:#fff0f0}.sudoku-cell.is-hint-related{background:#fff7d6}.sudoku-cell.is-hint-target{z-index:2;background:#ffefad;animation:1.2s hint-pulse;box-shadow:inset 0 0 0 4px #b36a00}@keyframes hint-pulse{0%,to{box-shadow:inset 0 0 0 4px #b36a00}50%{box-shadow:inset 0 0 0 6px #e0a11b}}.cell-value:empty{display:none}.notes-grid{color:var(--muted);grid-template-rows:repeat(3,1fr);grid-template-columns:repeat(3,1fr);place-items:center;font-size:clamp(.46rem,1.6vw,.72rem);font-weight:680;display:grid;position:absolute;inset:3px}.notes-grid span[hidden]{visibility:hidden;display:block}.pause-cover{z-index:8;backdrop-filter:blur(10px);background:#ffffffeb;border-radius:.9rem;place-items:center;display:grid;position:absolute;inset:.45rem}.pause-cover[hidden]{display:none}.pause-card{text-align:center}.pause-card strong{margin-bottom:.75rem;font-size:1.4rem;display:block}.game-controls{gap:.9rem;display:grid}.control-card{background:var(--surface);border:1px solid #24324a1a;border-radius:1rem;padding:1rem}.number-pad{grid-template-columns:repeat(3,1fr);gap:.45rem;display:grid}.number-button{min-height:3.4rem;color:var(--brand-strong);cursor:pointer;background:#f4f7ff;border:1px solid #2457d624;border-radius:.75rem;font-size:1.25rem;font-weight:820}.number-button:hover{background:#e7efff}.number-button.is-complete{opacity:.28}.tool-grid{grid-template-columns:repeat(2,1fr);gap:.45rem;display:grid}.tool-button{background:var(--surface-soft);min-height:2.8rem;color:var(--ink);cursor:pointer;border:1px solid #24324a1f;border-radius:.72rem;padding:.55rem;font-size:.84rem;font-weight:720}.tool-button[aria-pressed=true]{color:#fff;background:var(--brand);border-color:var(--brand)}.coach-card{align-self:start}.hint-box{color:#5d4607;background:#fff8df;border:1px solid #ead28a;border-radius:.8rem;min-height:5.5rem;padding:.9rem;font-size:.88rem;line-height:1.55}.hint-box[data-empty=true]{background:var(--surface-soft);color:var(--muted)}.hint-kicker{color:var(--brand-strong);letter-spacing:.09em;text-transform:uppercase;margin-bottom:.25rem;font-size:.68rem;font-weight:850;display:block}.hint-box strong{color:var(--ink);font-size:1rem;display:block}.hint-box p{margin:.35rem 0 0}.hint-box ul{margin:.65rem 0 0;padding-left:1.15rem}.hint-box li+li{margin-top:.35rem}.hint-candidates{color:#6f591a;font-size:.8rem}.hint-actions{flex-wrap:wrap;gap:.45rem;margin-top:.8rem;display:flex}.hint-actions[hidden]{display:none}.hint-actions .button{min-height:2.35rem;padding:.5rem .7rem;font-size:.8rem}.hint-box[data-applied=true]{color:#315b45;background:#edfff5;border-color:#17724547}.status-line{min-height:1.4rem;color:var(--muted);text-align:center;font-size:.82rem}.completion-panel{background:#edfff5;border:1px solid #17724533;border-radius:1rem;margin-top:1rem;padding:1.15rem}.completion-panel[hidden]{display:none}.completion-panel h2{color:var(--success);margin:0 0 .35rem}.completion-panel p{color:#315b45;margin:0 0 .9rem}.completion-actions{flex-wrap:wrap;gap:.55rem;display:flex}.content-page{max-width:820px;margin-inline:auto;padding:3rem 0 5rem}.content-page h1{letter-spacing:-.055em;margin:0 0 1rem;font-size:clamp(2rem,6vw,3.8rem);line-height:1.05}.content-page h2{letter-spacing:-.025em;margin:2.2rem 0 .7rem}.content-page p,.content-page li{color:#4e5a70;line-height:1.8}.content-page .lead{font-size:1.15rem}.content-card{background:var(--surface);border:1px solid #24324a1a;border-radius:1rem;margin:1.25rem 0;padding:1.25rem}.inline-actions{flex-wrap:wrap;align-items:center;gap:.7rem;margin-top:1.2rem;display:flex}.resource-section{border-top:1px solid #24324a1f;margin-top:4.5rem;padding:2.4rem 0 1rem}.resource-heading{max-width:720px}.resource-heading h2{letter-spacing:-.045em;margin:0 0 .55rem;font-size:clamp(1.7rem,4vw,2.7rem);line-height:1.08}.resource-heading p{color:var(--muted);margin:0;line-height:1.75}.resource-links{grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;margin-top:1.5rem;display:grid}.resource-links a{border-top:3px solid var(--brand);min-height:12rem;color:var(--ink);background:#ffffffb3;border-radius:0 0 1rem 1rem;padding:1.4rem;text-decoration:none;transition:background .16s,transform .16s;display:block}.resource-links a:hover{background:var(--surface);transform:translateY(-2px)}.resource-links span{color:var(--brand-strong);letter-spacing:.12em;font-size:.72rem;font-weight:850;display:block}.resource-links strong{letter-spacing:-.025em;margin-top:1rem;font-size:1.2rem;display:block}.resource-links p{color:var(--muted);margin:.5rem 0 1.1rem;line-height:1.65}.resource-links small{color:var(--brand-strong);font-weight:760}.game-support-copy{border-top:1px solid #24324a1f;grid-template-columns:minmax(0,1fr) minmax(16rem,.55fr);gap:2rem;width:min(1080px,100% - 1rem);margin:-1.5rem auto 4rem;padding:1.45rem;display:grid}.game-support-copy h2{letter-spacing:-.035em;margin:0 0 .55rem;font-size:clamp(1.35rem,3vw,1.9rem)}.game-support-copy p{max-width:720px;color:var(--muted);margin:0;line-height:1.75}.game-support-copy nav{align-content:start;gap:.6rem;display:grid}.game-support-copy nav a{color:var(--brand-strong);border-bottom:1px solid #24324a1f;padding:.7rem 0;font-weight:720;text-decoration:none}.game-support-copy nav a:hover{color:var(--ink)}.breadcrumbs{color:var(--muted);margin-bottom:1.35rem;font-size:.82rem}.breadcrumbs li+li:before{content:"/";color:var(--line-strong);opacity:.55}.breadcrumbs a{color:var(--brand-strong);text-underline-offset:.2em}.learning-hub{max-width:1040px;padding-block:2rem 5rem}.learning-hero{max-width:780px;padding:1.3rem 0 2.7rem}.learning-hero h1{letter-spacing:-.06em;margin:0 0 1rem;font-size:clamp(2.25rem,6vw,4.65rem);line-height:1}.learning-hero .lead{color:var(--muted);margin:0;font-size:clamp(1.05rem,2vw,1.22rem);line-height:1.8}.learning-actions{flex-wrap:wrap;gap:.7rem;margin-top:1.45rem;display:flex}.learning-level{border-top:1px solid #24324a1f;padding:2rem 0 2.5rem}.learning-level-heading{grid-template-columns:12rem minmax(0,1fr);gap:1.4rem;margin-bottom:1.2rem;display:grid}.learning-level-heading h2{letter-spacing:-.035em;margin:0;font-size:1.45rem}.learning-level-heading p{max-width:620px;color:var(--muted);margin:0;line-height:1.65}.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;display:grid}.lesson-card{background:var(--surface);border:1px solid #24324a1c;border-radius:1rem;flex-direction:column;min-height:14rem;padding:1.25rem;text-decoration:none;transition:border-color .16s,transform .16s,box-shadow .16s;display:flex;box-shadow:0 10px 28px #1d2d520d}.lesson-card:hover{border-color:#2457d652;transform:translateY(-2px);box-shadow:0 16px 34px #1d2d5217}.lesson-card>span{color:var(--brand-strong);letter-spacing:.08em;text-transform:uppercase;font-size:.72rem;font-weight:820}.lesson-card strong{letter-spacing:-.025em;margin-top:.9rem;font-size:1.16rem}.lesson-card p{color:var(--muted);margin:.55rem 0 1rem;line-height:1.65}.lesson-card small{color:var(--brand-strong);margin-top:auto;font-weight:760}.learning-practice,.article-practice{color:#fff;background:linear-gradient(135deg,#173d9d,#2f6be8);border-radius:1rem;justify-content:space-between;align-items:center;gap:1.5rem;margin-top:2.2rem;padding:1.45rem;display:flex}.learning-practice h2,.article-practice h2{margin:0 0 .4rem;font-size:1.35rem}.learning-practice p,.article-practice p{color:#ffffffc9;max-width:680px;margin:0;line-height:1.65}.learning-practice .button,.article-practice .button{color:var(--brand-strong);box-shadow:none;background:#fff;flex:none}.learning-article{max-width:900px;padding-block:2rem 5rem}.article-header{max-width:800px;padding:1.2rem 0 2rem}.article-meta{color:var(--brand-strong);letter-spacing:.05em;text-transform:uppercase;gap:.55rem;font-size:.78rem;font-weight:780;display:flex}.article-meta span+span:before{content:"·";color:var(--muted);margin-right:.55rem}.article-header h1{letter-spacing:-.058em;margin:.8rem 0 .9rem;font-size:clamp(2.35rem,6vw,4.5rem);line-height:1.02}.article-header .lead{max-width:720px;color:var(--muted);margin:0;font-size:clamp(1.05rem,2vw,1.24rem);line-height:1.78}.article-body{max-width:760px}.article-section{border-top:1px solid #24324a1c;padding:1.9rem 0}.article-section h2{letter-spacing:-.035em;margin:0 0 .8rem;font-size:clamp(1.45rem,3vw,2rem)}.article-section p,.article-section li{color:#445168;font-size:1.02rem;line-height:1.9}.article-section p{margin:0}.article-section p+p{margin-top:1rem}.article-section ul{margin:1rem 0 0;padding-left:1.25rem}.article-practice{max-width:820px;margin:2rem 0 3rem}.faq-section{max-width:760px;padding-top:.5rem}.faq-section>h2,.related-guides>h2{letter-spacing:-.035em;margin:0 0 1rem;font-size:1.55rem}.faq-list{border-top:1px solid #24324a21}.faq-list details{border-bottom:1px solid #24324a21}.faq-list summary{cursor:pointer;padding:1rem 0;font-weight:760}.faq-list details p{color:var(--muted);margin:0;padding:0 0 1.1rem;line-height:1.75}.related-guide-list a{background:var(--surface);border:1px solid #24324a1a;border-radius:.9rem;flex-direction:column;min-height:9.5rem;padding:1rem;text-decoration:none;display:flex}.related-guide-list span{color:var(--muted);text-transform:uppercase;font-size:.72rem;font-weight:760}.related-guide-list strong{letter-spacing:-.02em;margin-top:.65rem}.related-guide-list small{color:var(--brand-strong);margin-top:auto;font-weight:720}.stats-grid{grid-template-columns:repeat(4,1fr);gap:.8rem;margin:1.5rem 0;display:grid}.stat-card{background:var(--surface);border:1px solid #24324a1a;border-radius:1rem;padding:1.1rem}.stat-card small{color:var(--muted);font-weight:700}.stat-card strong{font-variant-numeric:tabular-nums;margin-top:.35rem;font-size:1.7rem;display:block}.history-list{gap:.65rem;display:grid}.history-row{background:var(--surface);border:1px solid #24324a1a;border-radius:.85rem;grid-template-columns:1fr auto auto;align-items:center;gap:1rem;padding:.9rem 1rem;display:grid}.history-row small{color:var(--muted)}.empty-state{border:1px dashed var(--line);color:var(--muted);text-align:center;border-radius:1rem;padding:2rem}.settings-form{gap:1rem;display:grid}.setting-row{background:var(--surface);border:1px solid #24324a1a;border-radius:.9rem;justify-content:space-between;align-items:center;gap:1.5rem;padding:1rem;display:flex}.setting-row span{display:block}.setting-row small{color:var(--muted);margin-top:.25rem;display:block}.setting-row select,.setting-row input[type=checkbox]{accent-color:var(--brand)}.setting-row select{border:1px solid var(--line);background:#fff;border-radius:.65rem;padding:.55rem .7rem}.site-footer{background:#fff9;border-top:1px solid #24324a1a}.footer-inner{min-height:7rem;color:var(--muted);justify-content:space-between;align-items:center;gap:1rem;font-size:.86rem;display:flex}.footer-links{flex-wrap:wrap;gap:1rem;display:flex}.footer-links a{text-decoration:none}@media (width<=900px){.difficulty-grid{grid-template-columns:repeat(2,1fr)}.feature-grid{grid-template-columns:1fr 1fr}.daily-card{grid-column:1/-1}.game-layout{grid-template-columns:1fr}.game-controls{grid-template-columns:1fr 1fr;width:min(36rem,100%);margin-inline:auto}.control-card:first-child{grid-row:span 2}.stats-grid{grid-template-columns:repeat(2,1fr)}.game-support-copy{grid-template-columns:1fr;gap:1rem}.related-guide-list{grid-template-columns:1fr 1fr}}@media (width<=620px){.header-inner,.page-shell,.footer-inner{width:min(100% - 1rem,1180px)}.header-inner{flex-direction:column;align-items:flex-start;min-height:auto;padding-block:.55rem}.site-nav{scrollbar-width:thin;width:100%;padding-bottom:.1rem;overflow-x:auto}.site-nav a{flex:none;padding:.5rem .58rem;font-size:.82rem}.hero{padding-top:2.4rem}.difficulty-grid,.feature-grid{grid-template-columns:1fr}.daily-card{grid-column:auto}.difficulty-card{min-height:10.5rem}.game-page{padding-top:.75rem}.game-topbar{align-items:flex-start}.game-meta{gap:.35rem}.meta-pill{min-width:4.4rem;padding:.45rem;font-size:.85rem}.game-layout{gap:.75rem}.board-panel{border-radius:.8rem;padding:.35rem}.game-controls{grid-template-columns:1fr;gap:.6rem}.control-card:first-child{grid-row:auto}.number-pad{grid-template-columns:repeat(9,1fr);gap:.22rem}.number-button{border-radius:.5rem;min-height:2.75rem;font-size:1rem}.tool-grid{grid-template-columns:repeat(4,1fr)}.tool-button{min-height:2.55rem;padding:.35rem .2rem;font-size:.74rem}.hint-box{min-height:auto}.history-row{grid-template-columns:1fr auto}.history-row>:last-child{grid-column:1/-1}.footer-inner{flex-direction:column;justify-content:center;align-items:flex-start;padding-block:1rem}.resource-links,.lesson-grid,.related-guide-list{grid-template-columns:1fr}.resource-links a{min-height:0}.learning-level-heading{grid-template-columns:1fr;gap:.45rem}.learning-practice,.article-practice{flex-direction:column;align-items:flex-start}.learning-practice .button,.article-practice .button{width:100%}.game-support-copy{width:min(100% - 1rem,1080px);padding-inline:.5rem}}:root[data-font-scale=extra-large] .site-nav{flex-wrap:wrap}:root[data-font-scale=extra-large] .tool-grid{grid-template-columns:repeat(2,1fr)}@media (forced-colors:active){.site-header,.board-panel,.control-card,.meta-pill,.hint-box,.completion-panel{border:1px solid canvastext}.sudoku-board{background:canvastext;border-color:canvastext}.sudoku-cell{forced-color-adjust:none;color:canvastext;background:canvas;border-color:canvastext}.sudoku-cell.is-selected,.sudoku-cell.is-hint-target{outline-offset:-4px;outline:3px solid highlight}.sudoku-cell.is-hint-related{outline-offset:-3px;outline:1px dashed highlight}.sudoku-cell.is-wrong{color:linktext}.brand-mark{background:canvastext;border:1px solid canvastext}.brand-logo{filter:contrast(115%)}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}.breadcrumbs{color:var(--muted);margin:0 0 1.35rem;font-size:.82rem}.breadcrumbs ol{flex-wrap:wrap;align-items:center;gap:.45rem;margin:0;padding:0;list-style:none;display:flex}.breadcrumbs li{align-items:center;gap:.45rem;display:inline-flex}.breadcrumbs li+li:before{content:"/";color:#98a2b3}.breadcrumbs a{text-decoration:none}.breadcrumbs a:hover{color:var(--brand-strong);text-underline-offset:.18em;text-decoration:underline}.breadcrumbs [aria-current=page]{color:var(--ink);font-weight:720}.game-context-nav{width:min(1080px,100% - 1rem);margin:1rem auto -.2rem}.game-context-nav .breadcrumbs{margin-bottom:0}.text-link{color:var(--brand-strong);text-underline-offset:.22em;margin-top:.75rem;font-weight:760;text-decoration-thickness:.08em;display:inline-flex}.content-actions{flex-wrap:wrap;gap:.75rem;margin-top:1.5rem;display:flex}.feature-grid-expanded{grid-template-columns:repeat(3,minmax(0,1fr))}.feature-grid-expanded .daily-card{flex-direction:column;grid-row:span 2;justify-content:center;display:flex}.game-support{padding-top:0}.game-support-intro{max-width:760px;margin-bottom:1.35rem}.game-support-intro h2{letter-spacing:-.04em;margin:0 0 .45rem;font-size:clamp(1.55rem,3vw,2.25rem)}.game-support-intro p{color:var(--muted);margin:0;font-size:1.03rem;line-height:1.75}.game-support-grid{border-top:1px solid #24324a1f;border-left:1px solid #24324a1f;grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.game-support-grid article{background:#ffffffa3;border-bottom:1px solid #24324a1f;border-right:1px solid #24324a1f;min-width:0;padding:1.35rem}.game-support-grid h3{margin:0 0 .45rem;font-size:1rem}.game-support-grid p{color:var(--muted);margin:0;line-height:1.7}.learn-hub{max-width:1020px}.learn-hero{max-width:850px;padding:1.25rem 0 3.4rem}.learn-hero h1{letter-spacing:-.06em;margin:0 0 1rem;font-size:clamp(2.45rem,7vw,5rem);line-height:1}.learn-hero p{max-width:760px;color:var(--muted);margin:0;font-size:clamp(1.03rem,2vw,1.2rem);line-height:1.75}.learn-hero-actions{flex-wrap:wrap;gap:.75rem;margin-top:1.5rem;display:flex}.guide-level+.guide-level{margin-top:3.25rem}.guide-level-heading{grid-template-columns:12rem 1fr;align-items:baseline;gap:1rem;margin-bottom:.9rem;display:grid}.guide-level-heading h2{letter-spacing:-.035em;margin:0;font-size:1.45rem}.guide-level-heading p{color:var(--muted);margin:0;line-height:1.6}.guide-list{border-top:1px solid #24324a24}.guide-row{border-bottom:1px solid #24324a24;grid-template-columns:3rem minmax(0,1fr) auto;align-items:start;gap:1rem;padding:1.2rem .25rem;text-decoration:none;transition:padding .16s,background .16s;display:grid}.guide-row:hover{background:#ffffff94;padding-inline:.75rem}.guide-index{color:var(--brand);letter-spacing:.1em;font-size:.76rem;font-weight:850}.guide-row-copy{min-width:0}.guide-row-copy strong{margin-bottom:.35rem;font-size:1.05rem;display:block}.guide-row-copy>span{color:var(--muted);line-height:1.6;display:block}.guide-time{color:var(--muted);white-space:nowrap;font-size:.78rem;font-weight:720}.learn-practice-callout{color:#fff;background:#173d9d;border-radius:1.2rem;justify-content:space-between;align-items:center;gap:2rem;margin-top:4rem;padding:2rem;display:flex}.learn-practice-callout h2{margin:0 0 .45rem;font-size:1.5rem}.learn-practice-callout p{color:#ffffffc7;max-width:680px;margin:0;line-height:1.7}.learn-practice-callout .button{color:#173d9d;box-shadow:none;background:#fff;flex:none}.lesson-page{max-width:1080px}.lesson-header{max-width:880px;padding:.8rem 0 2.8rem}.lesson-meta{color:var(--brand-strong);letter-spacing:.04em;text-transform:uppercase;gap:.75rem;margin-bottom:.85rem;font-size:.78rem;font-weight:820;display:flex}.lesson-meta span+span:before{content:"·";color:var(--line-strong);margin-right:.75rem}.lesson-header h1{letter-spacing:-.055em;margin:0 0 1.1rem;font-size:clamp(2.35rem,6vw,4.7rem);line-height:1.02}.lesson-header p{color:var(--muted);margin:0;font-size:clamp(1.05rem,2vw,1.22rem);line-height:1.8}.lesson-layout{grid-template-columns:14rem minmax(0,1fr);align-items:start;gap:clamp(2rem,6vw,5rem);display:grid}.lesson-toc{padding-top:.25rem;position:sticky;top:6rem}.lesson-toc strong{letter-spacing:.08em;text-transform:uppercase;margin-bottom:.75rem;font-size:.78rem;display:block}.lesson-toc ol{color:var(--muted);margin:0;padding-left:1.15rem}.lesson-toc li+li{margin-top:.6rem}.lesson-toc a{line-height:1.45;text-decoration:none}.lesson-toc a:hover{color:var(--brand-strong);text-underline-offset:.18em;text-decoration:underline}.lesson-body{min-width:0;max-width:760px}.lesson-body section+section{margin-top:2.8rem}.lesson-body h2{letter-spacing:-.035em;margin:0 0 .9rem;scroll-margin-top:6rem;font-size:clamp(1.45rem,3vw,2rem)}.lesson-body p{color:#4e5a70;margin:0;font-size:1.02rem;line-height:1.85}.lesson-body p+p{margin-top:1rem}.lesson-steps{counter-reset:lesson-step;margin:1.25rem 0 0;padding:0;list-style:none}.lesson-steps li{color:#4e5a70;counter-increment:lesson-step;border-bottom:1px solid #24324a1a;min-height:2.4rem;padding:.55rem 0 .75rem 3rem;line-height:1.65;position:relative}.lesson-steps li:before{content:counter(lesson-step);aspect-ratio:1;color:#fff;background:var(--brand);border-radius:50%;place-items:center;width:2rem;font-size:.76rem;font-weight:820;display:grid;position:absolute;inset:.45rem auto auto 0}.lesson-faq details{border-bottom:1px solid #24324a21}.lesson-faq summary{cursor:pointer;color:var(--ink);padding:1rem 2rem 1rem 0;font-weight:760;line-height:1.5}.lesson-faq details p{padding:0 0 1.1rem}.related-guides{border-top:1px solid #24324a24;margin-top:4.5rem;padding-top:1.5rem}.related-guides-heading{justify-content:space-between;align-items:baseline;gap:1rem;margin-bottom:1rem;display:flex}.related-guides-heading h2{margin:0;font-size:1.45rem}.related-guides-heading a{color:var(--brand-strong);font-weight:720}.related-guide-list{grid-template-columns:repeat(3,minmax(0,1fr));gap:.75rem;display:grid}.related-guide-list a{background:var(--surface);border:1px solid #24324a1c;border-radius:.9rem;min-width:0;padding:1.1rem;text-decoration:none}.related-guide-list span{color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.45rem;font-size:.72rem;font-weight:720;display:block}.related-guide-list strong{line-height:1.4}.lesson-practice{background:#dce8ff61;border:1px solid #2457d629;border-radius:1rem;justify-content:space-between;align-items:center;gap:1.5rem;margin-top:3.5rem;padding:1.5rem;display:flex}.lesson-practice h2{margin:0 0 .35rem;font-size:1.25rem}.lesson-practice p{color:var(--muted);margin:0;line-height:1.6}:root[data-high-contrast=true] .guide-row,:root[data-high-contrast=true] .game-support-grid,:root[data-high-contrast=true] .game-support-grid article,:root[data-high-contrast=true] .related-guide-list a,:root[data-high-contrast=true] .lesson-practice{border-color:var(--line-strong)}@media (width<=900px){.feature-grid-expanded{grid-template-columns:1fr 1fr}.feature-grid-expanded .daily-card{grid-area:auto/1/auto/-1}.lesson-layout{grid-template-columns:1fr;gap:1.5rem}.lesson-toc{background:#ffffff94;border:1px solid #24324a1c;border-radius:.9rem;padding:1rem;position:static}.related-guide-list{grid-template-columns:1fr}}@media (width<=620px){.feature-grid-expanded,.game-support-grid{grid-template-columns:1fr}.feature-grid-expanded .daily-card{grid-column:auto}.guide-level-heading{grid-template-columns:1fr;gap:.3rem}.guide-row{grid-template-columns:2rem minmax(0,1fr);gap:.7rem}.guide-time{grid-column:2}.learn-practice-callout,.lesson-practice{flex-direction:column;align-items:flex-start}.learn-practice-callout .button,.lesson-practice .button{width:100%}.lesson-header{padding-bottom:2rem}.lesson-meta{flex-wrap:wrap}}.printable-hub{max-width:920px}.printable-level-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;margin:1.5rem 0 2.5rem;display:grid}.printable-level-card{background:var(--surface);border:1px solid #24324a1c;border-radius:1rem;padding:1.25rem;text-decoration:none;display:block;box-shadow:0 10px 28px #1d2d520f}.printable-level-card:hover{border-color:#2457d647;transform:translateY(-2px)}.printable-level-card strong{font-size:1.1rem;display:block}.printable-level-card p{margin:.55rem 0 .8rem}.printable-level-card span{color:var(--brand-strong);font-weight:760}.printable-page{width:min(1040px,100% - 2rem);padding-block:2.25rem 4rem}.printable-heading{justify-content:space-between;align-items:flex-start;gap:1.5rem;margin-bottom:2rem;display:flex}.printable-heading h1{letter-spacing:-.05em;margin:.2rem 0 .4rem;font-size:clamp(2rem,5vw,3.6rem);line-height:1.05}.printable-heading p{color:var(--muted);margin:0}.printable-brand{letter-spacing:.08em;text-transform:uppercase;font-size:.78rem;font-weight:850;color:var(--brand-strong)!important}.printable-section+.printable-section{margin-top:3.5rem}.printable-section>h2{margin:0 0 1rem;font-size:1.4rem}.printable-sheet{grid-template-columns:repeat(2,minmax(0,1fr));gap:1.5rem;display:grid}.printable-item{break-inside:avoid;background:#fff;border:1px solid #24324a1c;border-radius:1rem;min-width:0;margin:0;padding:1rem}.printable-item figcaption{justify-content:space-between;align-items:baseline;gap:.7rem;margin-bottom:.6rem;display:flex}.printable-item figcaption strong{color:var(--ink);font-size:.95rem}.printable-item figcaption span{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;font-size:.66rem;overflow:hidden}.printable-grid{aspect-ratio:1;font-variant-numeric:tabular-nums;background:#111;border:3px solid #111;grid-template-columns:repeat(9,minmax(0,1fr));width:100%;font-family:Arial,Helvetica,sans-serif;display:grid}.printable-cell{color:#111;background:#fff;border-bottom:1px solid #777;border-right:1px solid #777;place-items:center;min-width:0;font-size:clamp(.72rem,2.6vw,1.35rem);font-weight:520;line-height:1;display:grid}.printable-cell:nth-child(9n){border-right:0}.printable-cell:nth-last-child(-n+9){border-bottom:0}.printable-cell:nth-child(9n+3),.printable-cell:nth-child(9n+6){border-right:3px solid #111}.printable-cell:nth-child(n+19):nth-child(-n+27),.printable-cell:nth-child(n+46):nth-child(-n+54){border-bottom:3px solid #111}.printable-cell.is-print-given{font-weight:760}.printable-cell.is-answer-entry{color:#40506a;font-weight:520}.printable-source-note{color:var(--muted);margin-top:1.5rem;font-size:.78rem;line-height:1.6}@media (width<=700px){.printable-level-grid,.printable-sheet{grid-template-columns:1fr}.printable-heading{display:grid}.print-button{width:100%}.printable-item{padding:.75rem}.printable-cell{font-size:clamp(.9rem,5.2vw,1.45rem)}}@page{size:A4 portrait;margin:9mm}@media print{html,body{color:#000;width:auto;min-height:auto;background:#fff!important}.site-header,.site-footer,.skip-link,.print-button{display:none!important}main{display:block}.printable-page{width:auto;max-width:none;padding:0}.printable-heading{margin:0 0 5mm}.printable-heading h1{letter-spacing:-.02em;margin:0 0 1mm;font-size:18pt}.printable-heading p{color:#222;font-size:8.5pt}.printable-brand{font-size:7pt!important}.printable-section>h2{margin:0 0 3mm;font-size:12pt}.printable-sheet{grid-template-columns:repeat(2,minmax(0,1fr));gap:7mm 9mm}.printable-item{box-shadow:none;border:0;border-radius:0;padding:0}.printable-item figcaption{margin-bottom:1.8mm}.printable-item figcaption strong{font-size:8pt}.printable-item figcaption span{color:#222;max-width:66%;font-size:5.8pt}.printable-grid{-webkit-print-color-adjust:exact;print-color-adjust:exact;border-width:1.5pt}.printable-cell{border-bottom-width:.35pt;border-right-width:.35pt;font-size:12pt}.printable-cell:nth-child(9n+3),.printable-cell:nth-child(9n+6){border-right-width:1.25pt}.printable-cell:nth-child(n+19):nth-child(-n+27),.printable-cell:nth-child(n+46):nth-child(-n+54){border-bottom-width:1.25pt}.answer-key{break-before:page;padding-top:0;margin-top:0!important}.printable-source-note{color:#222;margin-top:4mm;font-size:6.5pt}}.lesson-steps{margin:1rem 0 0;padding-left:1.35rem}.lesson-steps li+li{margin-top:.55rem}.screen-only{display:block}@media (forced-colors:active){.lesson-card,.related-guide-list a,.resource-links a,.printable-level-card,.game-support-copy{border:1px solid canvastext}}@media print{.screen-only{display:none!important}}.language-switch{color:var(--brand-strong);background:#ffffffb8;border:1px solid #24324a24;border-radius:.65rem;flex:none;padding:.48rem .66rem;font-size:.78rem;font-weight:760;text-decoration:none}.language-switch:hover{background:var(--surface)}@media (width<=760px){.header-inner{flex-wrap:wrap}.language-switch{order:2}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}
