:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;--primary:#4f5b92;--on-primary:#fff;--primary-container:#dde1ff;--on-primary-container:#374379;--secondary:#5a5d72;--on-secondary:#fff;--secondary-container:#dfe1f9;--on-secondary-container:#424659;--tertiary:#76546e;--on-tertiary:#fff;--tertiary-container:#ffd7f3;--on-tertiary-container:#5c3d56;--error:#ba1a1a;--on-error:#fff;--surface:#fbf8ff;--on-surface:#1b1b21;--on-surface-variant:#45464f;--surface-container-lowest:#fff;--surface-container-low:#f5f2fa;--surface-container:#efedf4;--surface-container-high:#e9e7ef;--surface-container-highest:#e3e1e9;--outline:#767680;--outline-variant:#c6c5d0;--inverse-surface:#303036;--on-inverse-surface:#f2f0f7;--board-background:#fbf8ff;--board-thin-line:#c6c5d0;--board-thick-line:#1b1b21;--board-given:#1b1b21;--board-entry:#4f5b92;--board-mistake:#ba1a1a;--board-note:#45464f;--board-selected:#dde1ff;--board-related:#e3e1e9;--board-same-digit:#dfe1f9;--board-hint-area:#ffd7f399;--board-hint-target:#76546e59;--board-cage:#45464f}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}:root:not([data-theme=light]){--primary:#b8c3ff;--on-primary:#202c61;--primary-container:#374379;--on-primary-container:#dde1ff;--secondary:#c3c5dd;--on-secondary:#2c2f42;--secondary-container:#424659;--on-secondary-container:#dfe1f9;--tertiary:#e4bad9;--on-tertiary:#44273e;--tertiary-container:#5c3d56;--on-tertiary-container:#ffd7f3;--error:#ffb4ab;--on-error:#690005;--surface:#121318;--on-surface:#e3e1e9;--on-surface-variant:#c6c5d0;--surface-container-lowest:#0d0e13;--surface-container-low:#1b1b21;--surface-container:#1f1f25;--surface-container-high:#292a2f;--surface-container-highest:#34343a;--outline:#90909a;--outline-variant:#45464f;--inverse-surface:#e3e1e9;--on-inverse-surface:#303036;--board-background:#121318;--board-thin-line:#45464f;--board-thick-line:#e3e1e9;--board-given:#e3e1e9;--board-entry:#b8c3ff;--board-mistake:#ffb4ab;--board-note:#c6c5d0;--board-selected:#374379;--board-related:#34343a;--board-same-digit:#424659;--board-hint-area:#5c3d5699;--board-hint-target:#e4bad959;--board-cage:#c6c5d0}}:root[data-theme=light]{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--primary:#b8c3ff;--on-primary:#202c61;--primary-container:#374379;--on-primary-container:#dde1ff;--secondary:#c3c5dd;--on-secondary:#2c2f42;--secondary-container:#424659;--on-secondary-container:#dfe1f9;--tertiary:#e4bad9;--on-tertiary:#44273e;--tertiary-container:#5c3d56;--on-tertiary-container:#ffd7f3;--error:#ffb4ab;--on-error:#690005;--surface:#121318;--on-surface:#e3e1e9;--on-surface-variant:#c6c5d0;--surface-container-lowest:#0d0e13;--surface-container-low:#1b1b21;--surface-container:#1f1f25;--surface-container-high:#292a2f;--surface-container-highest:#34343a;--outline:#90909a;--outline-variant:#45464f;--inverse-surface:#e3e1e9;--on-inverse-surface:#303036;--board-background:#121318;--board-thin-line:#45464f;--board-thick-line:#e3e1e9;--board-given:#e3e1e9;--board-entry:#b8c3ff;--board-mistake:#ffb4ab;--board-note:#c6c5d0;--board-selected:#374379;--board-related:#34343a;--board-same-digit:#424659;--board-hint-area:#5c3d5699;--board-hint-target:#e4bad959;--board-cage:#c6c5d0}
:root{--radius-card:12px;--radius-large:20px;--radius-pill:999px;--page-max:1080px;--gutter:16px;--font:system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--surface);color:var(--on-surface);font-family:var(--font);-webkit-font-smoothing:antialiased;margin:0;font-size:1rem;line-height:1.55}a{color:var(--primary)}h1,h2,h3{text-wrap:balance;margin:0 0 .5em;line-height:1.2}h1{letter-spacing:-.02em;font-size:clamp(2rem,5vw,3rem);font-weight:700}h2{font-size:clamp(1.4rem,3vw,1.75rem);font-weight:650}h3{font-size:1.05rem;font-weight:600}p{margin:0 0 1em}:focus-visible{outline:3px solid var(--primary);outline-offset:2px}.skip-link{inset-inline-start:var(--gutter);border-radius:var(--radius-pill);background:var(--primary);color:var(--on-primary);z-index:10;padding:8px 16px;position:absolute;top:-100px}.skip-link:focus{top:8px}.container{width:100%;max-width:var(--page-max);padding-inline:var(--gutter);margin-inline:auto}.site-header{z-index:5;background:color-mix(in srgb, var(--surface) 88%, transparent);-webkit-backdrop-filter:saturate(1.4)blur(12px);backdrop-filter:saturate(1.4)blur(12px);border-bottom:1px solid var(--outline-variant);position:sticky;top:0}.site-header .container{justify-content:space-between;align-items:center;gap:16px;min-height:60px;display:flex}.brand{color:var(--on-surface);align-items:center;gap:10px;font-size:1.15rem;font-weight:700;text-decoration:none;display:inline-flex}.brand svg{flex:none}.site-nav{align-items:center;gap:4px;display:flex}.site-nav a{border-radius:var(--radius-pill);color:var(--on-surface-variant);padding:8px 12px;font-weight:500;text-decoration:none}.site-nav a:hover{background:var(--surface-container-high);color:var(--on-surface)}.site-nav a.cta{background:var(--primary);color:var(--on-primary)}@media (max-width:520px){.site-nav a:not(.cta){display:none}}main{padding-block:32px 64px;display:block}section{margin-block:56px}[id]{scroll-margin-top:76px}.lead{color:var(--on-surface-variant);max-width:62ch;font-size:1.15rem}.hero{align-items:center;gap:32px;margin-top:16px;display:grid}@media (min-width:860px){.hero{grid-template-columns:1.2fr 1fr}}.hero-art{justify-self:center;width:min(100%,360px)}.card{background:var(--surface-container-low);border:1px solid var(--outline-variant);border-radius:var(--radius-card);padding:16px}.family{margin-top:28px}.family h3{color:var(--on-surface-variant);letter-spacing:.06em;text-transform:uppercase;margin-bottom:12px;font-size:.85rem}.puzzle-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,240px),1fr));gap:12px;margin:0;padding:0;list-style:none;display:grid}.puzzle-card{align-items:flex-start;gap:14px;height:100%;display:flex}.puzzle-card .icon{background:var(--primary-container);width:44px;height:44px;color:var(--on-primary-container);border-radius:12px;flex:none;place-items:center;display:grid}.puzzle-card h4{margin:2px 0 4px;font-size:1rem}.puzzle-card p{color:var(--on-surface-variant);margin:0;font-size:.9rem}.feature-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr));gap:12px;display:grid}.feature-grid .card h3{margin-bottom:6px}.feature-grid .card p{color:var(--on-surface-variant);margin:0;font-size:.95rem}.panel{background:var(--primary-container);color:var(--on-primary-container);border-radius:var(--radius-large);padding:clamp(20px,4vw,36px)}.panel p{max-width:62ch}.badges{flex-wrap:wrap;gap:10px;margin-top:8px;display:flex}.badge{border-radius:var(--radius-pill);background:var(--on-primary-container);color:var(--primary-container);align-items:center;gap:8px;padding:10px 18px;font-weight:600;text-decoration:none;display:inline-flex}.badge[aria-disabled=true]{opacity:.75}.badge small{opacity:.85;font-weight:500}.faq details{border-bottom:1px solid var(--outline-variant);padding-block:14px}.faq summary{cursor:pointer;font-weight:600}.faq details p{color:var(--on-surface-variant);margin:10px 0 0}.prose{max-width:70ch}.prose h2{margin-top:1.8em;font-size:1.3rem}.prose ul{padding-inline-start:1.2em}.prose .meta{color:var(--on-surface-variant);font-size:.9rem}.site-footer{border-top:1px solid var(--outline-variant);background:var(--surface-container-low);color:var(--on-surface-variant);padding-block:32px;font-size:.92rem}.site-footer .container{flex-wrap:wrap;justify-content:space-between;gap:16px 32px;display:flex}.site-footer nav{flex-wrap:wrap;gap:8px 20px;display:flex}.site-footer a{color:var(--on-surface-variant)}