*,:before,:after{--tw-border-spacing-x: 0;--tw-border-spacing-y: 0;--tw-translate-x: 0;--tw-translate-y: 0;--tw-rotate: 0;--tw-skew-x: 0;--tw-skew-y: 0;--tw-scale-x: 1;--tw-scale-y: 1;--tw-pan-x: ;--tw-pan-y: ;--tw-pinch-zoom: ;--tw-scroll-snap-strictness: proximity;--tw-gradient-from-position: ;--tw-gradient-via-position: ;--tw-gradient-to-position: ;--tw-ordinal: ;--tw-slashed-zero: ;--tw-numeric-figure: ;--tw-numeric-spacing: ;--tw-numeric-fraction: ;--tw-ring-inset: ;--tw-ring-offset-width: 0px;--tw-ring-offset-color: #fff;--tw-ring-color: rgb(59 130 246 / .5);--tw-ring-offset-shadow: 0 0 #0000;--tw-ring-shadow: 0 0 #0000;--tw-shadow: 0 0 #0000;--tw-shadow-colored: 0 0 #0000;--tw-blur: ;--tw-brightness: ;--tw-contrast: ;--tw-grayscale: ;--tw-hue-rotate: ;--tw-invert: ;--tw-saturate: ;--tw-sepia: ;--tw-drop-shadow: ;--tw-backdrop-blur: ;--tw-backdrop-brightness: ;--tw-backdrop-contrast: ;--tw-backdrop-grayscale: ;--tw-backdrop-hue-rotate: ;--tw-backdrop-invert: ;--tw-backdrop-opacity: ;--tw-backdrop-saturate: ;--tw-backdrop-sepia: ;--tw-contain-size: ;--tw-contain-layout: ;--tw-contain-paint: ;--tw-contain-style: }::backdrop{--tw-border-spacing-x: 0;--tw-border-spacing-y: 0;--tw-translate-x: 0;--tw-translate-y: 0;--tw-rotate: 0;--tw-skew-x: 0;--tw-skew-y: 0;--tw-scale-x: 1;--tw-scale-y: 1;--tw-pan-x: ;--tw-pan-y: ;--tw-pinch-zoom: ;--tw-scroll-snap-strictness: proximity;--tw-gradient-from-position: ;--tw-gradient-via-position: ;--tw-gradient-to-position: ;--tw-ordinal: ;--tw-slashed-zero: ;--tw-numeric-figure: ;--tw-numeric-spacing: ;--tw-numeric-fraction: ;--tw-ring-inset: ;--tw-ring-offset-width: 0px;--tw-ring-offset-color: #fff;--tw-ring-color: rgb(59 130 246 / .5);--tw-ring-offset-shadow: 0 0 #0000;--tw-ring-shadow: 0 0 #0000;--tw-shadow: 0 0 #0000;--tw-shadow-colored: 0 0 #0000;--tw-blur: ;--tw-brightness: ;--tw-contrast: ;--tw-grayscale: ;--tw-hue-rotate: ;--tw-invert: ;--tw-saturate: ;--tw-sepia: ;--tw-drop-shadow: ;--tw-backdrop-blur: ;--tw-backdrop-brightness: ;--tw-backdrop-contrast: ;--tw-backdrop-grayscale: ;--tw-backdrop-hue-rotate: ;--tw-backdrop-invert: ;--tw-backdrop-opacity: ;--tw-backdrop-saturate: ;--tw-backdrop-sepia: ;--tw-contain-size: ;--tw-contain-layout: ;--tw-contain-paint: ;--tw-contain-style: }*,:before,:after{box-sizing:border-box;border-width:0;border-style:solid;border-color:#e5e7eb}:before,:after{--tw-content: ""}html,:host{line-height:1.5;-webkit-text-size-adjust:100%;-moz-tab-size:4;-o-tab-size:4;tab-size:4;font-family:ui-sans-serif,system-ui,sans-serif,"Apple Color Emoji","Segoe UI Emoji",Segoe UI Symbol,"Noto Color Emoji";font-feature-settings:normal;font-variation-settings:normal;-webkit-tap-highlight-color:transparent}body{margin:0;line-height:inherit}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace;font-feature-settings:normal;font-variation-settings:normal;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}button,input,optgroup,select,textarea{font-family:inherit;font-feature-settings:inherit;font-variation-settings:inherit;font-size:100%;font-weight:inherit;line-height:inherit;letter-spacing:inherit;color:inherit;margin:0;padding:0}button,select{text-transform:none}button,input:where([type=button]),input:where([type=reset]),input:where([type=submit]){-webkit-appearance:button;background-color:transparent;background-image:none}:-moz-focusring{outline:auto}:-moz-ui-invalid{box-shadow:none}progress{vertical-align:baseline}::-webkit-inner-spin-button,::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}summary{display:list-item}blockquote,dl,dd,h1,h2,h3,h4,h5,h6,hr,figure,p,pre{margin:0}fieldset{margin:0;padding:0}legend{padding:0}ol,ul,menu{list-style:none;margin:0;padding:0}dialog{padding:0}textarea{resize:vertical}input::-moz-placeholder,textarea::-moz-placeholder{opacity:1;color:#9ca3af}input::placeholder,textarea::placeholder{opacity:1;color:#9ca3af}button,[role=button]{cursor:pointer}:disabled{cursor:default}img,svg,video,canvas,audio,iframe,embed,object{display:block;vertical-align:middle}img,video{max-width:100%;height:auto}[hidden]:where(:not([hidden=until-found])){display:none}.container{width:100%}@media(min-width:640px){.container{max-width:640px}}@media(min-width:768px){.container{max-width:768px}}@media(min-width:1024px){.container{max-width:1024px}}@media(min-width:1280px){.container{max-width:1280px}}@media(min-width:1536px){.container{max-width:1536px}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.\!visible{visibility:visible!important}.visible{visibility:visible}.static{position:static}.absolute{position:absolute}.relative{position:relative}.block{display:block}.grid{display:grid}.hidden{display:none}.rotate-180{--tw-rotate: 180deg;transform:translate(var(--tw-translate-x),var(--tw-translate-y)) rotate(var(--tw-rotate)) skew(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}.rotate-90{--tw-rotate: 90deg;transform:translate(var(--tw-translate-x),var(--tw-translate-y)) rotate(var(--tw-rotate)) skew(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}.transform{transform:translate(var(--tw-translate-x),var(--tw-translate-y)) rotate(var(--tw-rotate)) skew(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}.border{border-width:1px}.outline{outline-style:solid}.filter{filter:var(--tw-blur) var(--tw-brightness) var(--tw-contrast) var(--tw-grayscale) var(--tw-hue-rotate) var(--tw-invert) var(--tw-saturate) var(--tw-sepia) var(--tw-drop-shadow)}:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#102a43;background:#f5f0e6;font-synthesis:none;text-rendering:optimizeLegibility;--ink: #102a43;--ink-soft: #29455f;--ivory: #f7f3ea;--paper: #fffdf8;--sage: #dce8d7;--sage-dark: #3f684f;--saffron: #efa91e;--saffron-ink: #7a5200;--coral: #c85a4e;--blue-wash: #e8eff5;--line: #d8d2c7;--muted: #596870;--serif: Georgia, "Times New Roman", serif;--shadow: 0 18px 50px rgba(16, 42, 67, .08);--ease-out-ui: cubic-bezier(.23, 1, .32, 1);--ease-drawer: cubic-bezier(.32, .72, 0, 1)}*{box-sizing:border-box}html{background:var(--ivory)}body{margin:0;min-width:320px;min-height:100vh;background:var(--ivory)}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:var(--serif);font-weight:500;letter-spacing:-.025em}h1{font-size:clamp(2.35rem,4vw,4.4rem);line-height:.98}h2{font-size:clamp(1.4rem,2vw,2rem)}p{line-height:1.65;color:var(--ink-soft)}button:focus-visible,a:focus-visible{outline:3px solid rgba(239,169,30,.65);outline-offset:3px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.mobile-only{display:none!important}.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--serif);font-size:1.15rem;font-weight:600;color:var(--ink);white-space:nowrap}.brand-mark{display:block;width:36px;height:36px;border:1px solid var(--ink);border-radius:50%;background:var(--ivory);-o-object-fit:cover;object-fit:cover;box-shadow:3px 3px 0 var(--ink)}.mascot{-o-object-fit:contain;object-fit:contain}.asset-fallback{display:grid;place-items:center;min-width:80px;min-height:80px;border:1px solid var(--line);border-radius:50%;background:var(--sage);color:var(--ink);font-family:var(--serif);font-size:1.25rem}.offline-banner{position:fixed;z-index:1000;right:16px;bottom:16px;width:min(390px,calc(100% - 32px));padding:12px 15px;border:1px solid #b98417;border-radius:5px;background:#fff6df;color:var(--ink);box-shadow:var(--shadow);font-size:.78rem;line-height:1.5}.fatal-error{width:min(620px,calc(100% - 40px));min-height:100vh;margin:0 auto;display:flex;align-items:flex-start;justify-content:center;flex-direction:column}.fatal-error-mark{width:90px;height:90px;margin-bottom:28px}.fatal-error h1{max-width:540px;margin:8px 0 15px;font-size:clamp(2.4rem,7vw,4.5rem)}.fatal-error p{max-width:520px;margin:0 0 28px;line-height:1.7}.fatal-error>div:last-child{display:flex;flex-wrap:wrap;gap:10px}.public-legal-links{padding:24px;display:flex;justify-content:center;gap:24px;color:var(--muted);font-size:.72rem}.public-legal-links a:hover,.legal-footer a:hover{color:var(--ink)}.public-legal-links .domain-signature{color:var(--ink-soft);font-family:var(--serif);letter-spacing:.04em}.legal-page{min-height:100vh;background:var(--paper)}.legal-content{width:min(760px,calc(100% - 40px));margin:0 auto;padding:70px 0 90px}.legal-content h1{max-width:700px;margin:10px 0 24px;font-size:clamp(2.7rem,7vw,5rem)}.legal-content h2{margin:42px 0 10px;font-size:1.45rem}.legal-content p{margin:0 0 16px;color:var(--ink-soft);font-size:.96rem;line-height:1.8}.legal-content .legal-lead{max-width:680px;color:var(--ink);font-family:var(--serif);font-size:1.25rem;line-height:1.65}.legal-footer{padding:28px 40px;display:flex;justify-content:center;gap:24px;border-top:1px solid var(--line);color:var(--muted);font-size:.75rem}.public-header{height:82px;max-width:1320px;margin:0 auto;padding:0 44px;display:flex;align-items:center;justify-content:space-between}.text-link,.text-button{display:inline-flex;align-items:center;gap:7px;border:0;padding:0;color:var(--ink);background:transparent;font-weight:650;font-size:.87rem;cursor:pointer}.text-link:hover,.text-button:hover{color:var(--sage-dark)}.eyebrow{display:block;margin-bottom:9px;text-transform:uppercase;letter-spacing:.13em;font-size:.68rem;font-weight:800;color:var(--sage-dark)}.button{min-height:47px;padding:0 21px;border:1px solid transparent;border-radius:4px;display:inline-flex;align-items:center;justify-content:center;gap:9px;font-weight:720;font-size:.9rem;cursor:pointer;transition:transform .15s var(--ease-out-ui),background-color .18s ease,color .18s ease}.button:active:not(:disabled){transform:scale(.97)}.button-primary{background:var(--ink);color:#fff;box-shadow:0 8px 20px #102a4329}.button-outline{border-color:var(--ink);color:var(--ink);background:transparent}.button-ghost{color:var(--ink);background:transparent}.button-saffron{background:var(--saffron);border-color:#d89511;color:#382606;box-shadow:0 8px 20px #efa91e38}.wide{width:100%}.icon-button{width:40px;height:40px;display:grid;place-items:center;border:0;border-radius:50%;background:transparent;cursor:pointer;transition:transform .15s var(--ease-out-ui),background-color .15s ease}.icon-button:active:not(:disabled){transform:scale(.95)}@media(hover:hover)and (pointer:fine){.button:hover{transform:translateY(-2px)}.button:hover:active:not(:disabled){transform:scale(.97)}.button-primary:hover{background:#1a3b58;box-shadow:0 11px 24px #102a4333}.button-outline:hover{background:var(--ink);color:#fff}.icon-button:hover{background:#102a4312}}.welcome-page{min-height:100vh;position:relative;overflow:hidden;background:radial-gradient(circle at 68% 45%,rgba(220,232,215,.62),transparent 27%),var(--ivory)}.welcome-hero{min-height:calc(100vh - 190px);max-width:1260px;margin:0 auto;padding:35px 64px 60px;display:grid;grid-template-columns:.95fr 1.05fr;align-items:center;gap:70px}.welcome-copy{position:relative;z-index:2;animation:rise .65s ease both}.welcome-copy h1{margin:0 0 26px;max-width:680px;color:var(--ink)}.welcome-copy>p{max-width:540px;margin-bottom:32px;font-size:1.08rem}.hero-actions{display:flex;flex-wrap:wrap;gap:8px}.welcome-proof{margin-top:25px;display:flex;gap:24px;font-size:.77rem;color:var(--muted)}.welcome-proof span{display:flex;align-items:center;gap:6px}.welcome-proof svg{width:15px;color:var(--sage-dark)}.welcome-visual{align-self:stretch;min-height:600px;position:relative;display:grid;place-items:center;animation:reveal .8s .1s ease both}.welcome-visual .sun-disc{position:absolute;width:420px;height:420px;border-radius:50%;background:#e4ead7;box-shadow:inset 0 0 0 1px #47725a14}.welcome-visual .mascot{width:min(510px,92%);max-height:590px;position:relative;z-index:1;filter:drop-shadow(0 24px 28px rgba(16,42,67,.14))}.coach-quote{position:absolute;right:3%;bottom:15%;z-index:2;display:flex;align-items:center;gap:10px;padding:14px 16px;background:var(--paper);border:1px solid var(--line);border-radius:6px;box-shadow:var(--shadow);font-family:var(--serif);animation:float 4s ease-in-out infinite}.coach-quote svg{color:var(--saffron)}.welcome-features{max-width:1260px;margin:0 auto;padding:24px 64px 30px;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(3,1fr)}.welcome-features>div{display:flex;align-items:center;gap:15px;padding:0 25px;border-right:1px solid var(--line)}.welcome-features>div:first-child{padding-left:0}.welcome-features>div:last-child{border-right:0}.welcome-features p,.sidebar-note p{margin:0;display:flex;flex-direction:column}.welcome-features strong{font-family:var(--serif);font-size:.98rem}.welcome-features p span{color:var(--muted);font-size:.72rem;margin-top:3px}.welcome-learning{width:min(1132px,calc(100% - 128px));margin:42px auto 18px;padding:62px 0 44px;border-top:1px solid var(--line);display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:72px}.welcome-learning-intro h2{max-width:480px;margin:12px 0 18px;font-size:clamp(2rem,3.3vw,3.4rem)}.welcome-learning-intro p{max-width:540px;margin-bottom:26px}.welcome-learning-grid{display:grid;gap:0}.welcome-learning-grid article{padding:19px 0 21px;border-top:1px solid var(--line)}.welcome-learning-grid article:last-child{border-bottom:1px solid var(--line)}.welcome-learning-grid h3{margin:0 0 7px;font-size:1.12rem}.welcome-learning-grid p{max-width:620px;margin:0;font-size:.88rem}.feature-icon{width:40px;color:var(--ink)}.onboarding-page{min-height:100vh;display:flex;flex-direction:column}.onboarding-main{width:min(780px,calc(100% - 40px));margin:auto;padding:55px 0 25px}.onboarding-intro{text-align:center;max-width:600px;margin:0 auto 34px}.onboarding-intro h1{font-size:clamp(2.5rem,5vw,4rem);margin-bottom:15px}.onboarding-intro p{max-width:480px;margin:0 auto}.level-options{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.level-options button{min-height:196px;position:relative;padding:24px;border:1px solid var(--line);border-radius:8px;background:#ffffff73;text-align:left;cursor:pointer;transition:transform .18s var(--ease-out-ui),border-color .18s ease,background-color .18s ease}.level-options button:active{transform:scale(.985)}@media(hover:hover)and (pointer:fine){.level-options button:hover{border-color:#91a28e;transform:translateY(-3px)}.level-options button:hover:active{transform:scale(.985)}}.level-options button.selected{border-color:var(--sage-dark);background:#f0f5ed;box-shadow:0 10px 30px #47725a1f}.level-options button>span:nth-child(2){display:flex;flex-direction:column;gap:9px}.level-options strong{margin-top:26px;font-family:var(--serif);font-size:1.18rem}.level-options small{line-height:1.5;color:var(--muted)}.level-options button i{position:absolute;top:20px;right:20px;color:var(--sage-dark)}.level-number{color:var(--saffron-ink);font-family:var(--serif);font-size:.84rem}.onboarding-action{display:flex;flex-direction:column;align-items:center;gap:12px;margin-top:28px}.onboarding-action>span{color:var(--muted);font-size:.75rem}.onboarding-coach{width:min(620px,calc(100% - 40px));margin:20px auto 35px;display:flex;align-items:center;justify-content:center;gap:16px}.onboarding-coach .mascot{width:74px;height:74px}.onboarding-coach>div{display:flex;flex-direction:column;gap:4px}.onboarding-coach strong{font-family:var(--serif)}.onboarding-coach span{color:var(--muted);font-size:.8rem}.app-shell{min-height:100vh;display:grid;grid-template-columns:220px 1fr;background:var(--paper)}.sidebar{position:sticky;top:0;height:100vh;padding:28px 20px 20px;border-right:1px solid var(--line);background:var(--ivory);display:flex;flex-direction:column;z-index:30}.sidebar-head{padding:0 8px 35px;display:flex;align-items:center;justify-content:space-between}.sidebar nav{display:flex;flex-direction:column;gap:4px}.nav-link{height:44px;padding:0 12px;display:flex;align-items:center;gap:12px;border-radius:4px;color:#5c6b76;font-size:.84rem;font-weight:600}.nav-link:hover{background:#102a430d}.nav-link.active{background:var(--ink);color:#fff;box-shadow:0 5px 12px #102a4324}.sidebar-note{margin-top:auto;padding:18px 7px;display:flex;align-items:center;gap:9px;border-top:1px solid var(--line)}.sidebar-note .mascot{width:50px;height:58px}.sidebar-note strong{font-family:var(--serif);font-size:.8rem}.sidebar-note span{color:var(--muted);font-size:.62rem;line-height:1.4}.sidebar-upgrade{min-height:40px;display:flex;align-items:center;justify-content:center;gap:7px;border:1px solid #d1b66a;border-radius:4px;color:#75560c;font-size:.75rem;font-weight:700}.app-main{min-width:0}.mobile-header,.scrim{display:none}.page{width:min(1180px,calc(100% - 64px));margin:0 auto;padding:55px 0 80px}.page-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;margin-bottom:36px}.page-heading h1{margin-bottom:12px;font-size:clamp(2.5rem,4vw,3.7rem)}.page-heading p{margin:0}.section-title{display:flex;justify-content:space-between;align-items:flex-start;gap:25px}.section-title h2{margin:0}.difficulty{padding:6px 9px;border-radius:3px;background:var(--sage);color:var(--sage-dark);text-transform:uppercase;letter-spacing:.08em;font-size:.61rem;font-weight:800;white-space:nowrap}.streak{display:flex;align-items:center;gap:5px;padding-bottom:8px;font-size:.75rem;color:var(--muted)}.streak svg{color:var(--saffron)}.streak strong{color:var(--ink)}.home-primary{display:grid;grid-template-columns:1fr 285px;gap:16px}.today-panel,.progress-panel,.learning-path{border:1px solid var(--line);border-radius:8px;background:var(--paper)}.today-panel{padding:26px}.today-body{display:grid;grid-template-columns:210px 1fr;gap:26px;margin-top:24px;align-items:center}.today-copy>p{margin-bottom:16px;font-size:.85rem}.today-copy dl{margin:0 0 18px}.today-copy dl div{display:flex;justify-content:space-between;gap:15px;padding:7px 0;border-bottom:1px solid #ebe6dc;font-size:.72rem}.today-copy dt{color:var(--muted)}.today-copy dd{margin:0;font-weight:700}.mini-board{aspect-ratio:1;display:grid;grid-template-columns:repeat(9,1fr);border:1.5px solid var(--ink);background:#fff}.mini-board span{display:grid;place-items:center;min-width:0;border-right:1px solid #d8dde0;border-bottom:1px solid #d8dde0;font-family:var(--serif);font-size:clamp(.45rem,1vw,.72rem)}.mini-board .box-r{border-right:1.5px solid var(--ink)}.mini-board .box-b{border-bottom:1.5px solid var(--ink)}.progress-panel{padding:26px;display:flex;flex-direction:column;align-items:center}.progress-panel>.eyebrow{align-self:flex-start}.progress-ring{--progress: 0deg;width:160px;height:160px;border-radius:50%;margin:13px 0 20px;display:grid;place-items:center;background:conic-gradient(var(--saffron) var(--progress),#e8e6df 0);position:relative}.progress-ring:after{content:"";position:absolute;top:12px;right:12px;bottom:12px;left:12px;border-radius:50%;background:var(--paper)}.progress-ring>div{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center}.progress-ring strong{font-family:var(--serif);font-size:2rem;font-weight:500}.progress-ring span{color:var(--muted);font-size:.6rem}.progress-ring.small{width:105px;height:105px;margin:0}.progress-ring.small:after{top:8px;right:8px;bottom:8px;left:8px}.progress-ring.small strong{font-size:1.35rem}.progress-stats{width:100%;display:flex;flex-direction:column;gap:9px}.progress-stats span{display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:.67rem}.progress-stats strong{color:var(--ink);font-size:.78rem}.progress-stats .recent-mastery{margin-top:3px;padding-top:9px;align-items:flex-start;flex-direction:column;gap:2px;border-top:1px solid var(--line)}.recent-mastery strong{text-transform:capitalize}.recent-mastery i{color:var(--muted);font-style:normal;font-size:.61rem}.learning-path{margin-top:16px;padding:26px}.path-line{margin-top:32px;display:grid;grid-template-columns:repeat(3,1fr);position:relative}.path-line:before{content:"";height:1px;position:absolute;left:9%;right:9%;top:16px;background:var(--line)}.path-step{position:relative;display:flex;flex-direction:column;align-items:center;gap:4px;text-align:center}.path-step i{width:33px;height:33px;z-index:1;display:grid;place-items:center;border-radius:50%;border:1px solid var(--line);background:var(--paper);font-style:normal;font-size:.75rem}.path-step i svg{width:15px}.path-step strong{margin-top:6px;font-family:var(--serif);font-size:.86rem}.path-step span{color:var(--muted);font-size:.61rem}.path-step.done i{background:var(--sage-dark);color:#fff;border-color:var(--sage-dark)}.path-step.active i{background:var(--saffron);color:var(--ink);border-color:#d79612;box-shadow:0 0 0 5px #efa91e21}.continue-lesson{margin-top:16px;padding:22px 28px 22px 20px;display:grid;grid-template-columns:170px 1fr 125px;gap:28px;align-items:center;background:#eef3e9;border-radius:8px}.lesson-art{height:160px;display:grid;place-items:center;overflow:hidden}.lesson-art img{width:100%;height:100%;-o-object-fit:contain;object-fit:contain}.continue-lesson h2{margin-bottom:8px}.continue-lesson p{font-size:.82rem}.mastery{padding-left:24px;border-left:1px solid #cfdac9;display:flex;flex-direction:column}.mastery span,.mastery small{color:var(--muted);font-size:.66rem}.mastery strong{margin:5px 0;font-family:var(--serif);font-size:1.65rem}.mastery .evidence-status-text{text-transform:capitalize;font-size:1.05rem}.puzzle-page{min-height:100vh;background:var(--paper)}.puzzle-header{height:70px;padding:0 28px;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr auto 1fr;align-items:center}.puzzle-header>:last-child{justify-self:end}.puzzle-meta{display:flex;align-items:center;gap:16px}.timer{min-height:44px;padding:0 6px;display:flex;align-items:center;gap:6px;border:0;background:transparent;cursor:pointer;font-variant-numeric:tabular-nums}.mistake-count{color:var(--muted);font-size:.72rem}.puzzle-layout{width:min(1260px,calc(100% - 48px));margin:0 auto;padding:32px 0;display:grid;grid-template-columns:minmax(520px,740px) minmax(280px,355px);justify-content:center;gap:36px}.board-workspace{min-width:0;--puzzle-board-size: min(100%, max(440px, calc(100dvh - 244px) ))}.puzzle-goal,.exploration-banner{width:var(--puzzle-board-size);margin:0 auto 12px;padding:11px 14px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:11px;border:1px solid var(--line);border-radius:6px;background:#fffdf8bf}.puzzle-goal div,.exploration-banner div{display:flex;flex-direction:column;gap:2px}.puzzle-goal span,.exploration-banner span{color:var(--muted);font-size:.65rem}.puzzle-goal strong,.exploration-banner strong{font-family:var(--serif);font-size:.78rem}.puzzle-goal small{color:var(--muted);font-variant-numeric:tabular-nums}.puzzle-goal>svg{color:var(--sage-dark)}.puzzle-goal.complete{border-color:#9eb89f;background:#edf5e9}.puzzle-goal.just-completed{animation:goal-success-arrive .7s var(--ease-out-ui) both}.puzzle-goal.just-completed>svg{animation:goal-success-check .56s var(--ease-out-ui) both}.exploration-banner{border-color:#aabed0;background:var(--blue-wash)}.exploration-banner>svg{color:#2d6793}.board-wrap{position:relative;width:var(--puzzle-board-size);margin:0 auto}.sudoku-board{aspect-ratio:1;display:grid;grid-template-columns:repeat(9,minmax(0,1fr));grid-template-rows:repeat(9,minmax(0,1fr));border:2px solid var(--ink);background:#fff;box-shadow:0 15px 34px #102a4317}.sudoku-row{display:contents}.sudoku-cell{min-width:0;min-height:0;position:relative;display:grid;place-items:center;padding:0;border:0;border-right:1px solid #cfd6da;border-bottom:1px solid #cfd6da;background:#fff;cursor:pointer}.sudoku-cell.box-right{border-right:2px solid var(--ink)}.sudoku-cell.box-bottom{border-bottom:2px solid var(--ink)}.sudoku-cell.edge-right{border-right:0}.sudoku-cell.edge-bottom{border-bottom:0}.sudoku-cell.related{background:#f2f4ef}.sudoku-cell.same-value{background:#e4ede0}.sudoku-cell.selected{z-index:2;background:#dce9f4;box-shadow:inset 0 0 0 3px #2d6793}.sudoku-cell.hinted:after{content:"";position:absolute;top:6px;right:6px;bottom:6px;left:6px;border:2px solid var(--saffron);border-radius:50%;pointer-events:none;animation:pulse 1.6s ease infinite}.sudoku-cell.guide-related{background:#fff8e5}.sudoku-cell.guide-target{z-index:3;background:#ffe8a8;box-shadow:inset 0 0 0 3px var(--saffron),0 0 0 3px #e5a72d33}.sudoku-cell.conflict{background:#f8e6e2;box-shadow:inset 0 0 0 2px var(--coral)}.sudoku-cell.conflict:before{content:"!";position:absolute;right:4px;top:2px;color:var(--coral);font:800 10px sans-serif}.sudoku-cell.placement-success:before{content:"";position:absolute;z-index:4;top:3px;right:3px;bottom:3px;left:3px;border:2px solid var(--sage-dark);border-radius:4px;box-shadow:0 0 0 5px color-mix(in srgb,var(--sage-dark) 16%,transparent);pointer-events:none;animation:placement-success-ring .62s var(--ease-out-ui) both}.cell-success-mark{position:absolute;z-index:5;top:4px;right:4px;padding:2px 5px;border-radius:999px;background:var(--paper);color:var(--sage-dark);box-shadow:0 1px 4px color-mix(in srgb,var(--ink) 16%,transparent);font-family:Inter,ui-sans-serif,system-ui,sans-serif;font-size:clamp(.42rem,.7vw,.58rem);font-weight:700;line-height:1.2;pointer-events:none;animation:placement-success-label .7s var(--ease-out-ui) both}.sudoku-cell.placement-success .cell-value{color:var(--sage-dark)}.cell-value{font-family:var(--serif);font-size:clamp(1.25rem,3.3vw,2.15rem);color:#1f669a}.sudoku-cell.given .cell-value{color:var(--ink);font-weight:600}.candidate-grid{width:100%;height:100%;padding:4px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-template-rows:repeat(3,minmax(0,1fr))}.candidate-grid i{display:grid;place-items:center;font-style:normal;color:#587184;font-size:clamp(.44rem,.9vw,.7rem)}@keyframes placement-success-ring{0%{opacity:0;transform:scale(.82)}48%{opacity:1;transform:scale(1.035)}to{opacity:.82;transform:scale(1)}}@keyframes placement-success-label{0%{opacity:0;transform:translateY(4px) scale(.92)}}@keyframes goal-success-arrive{0%{box-shadow:0 0 color-mix(in srgb,var(--sage-dark) 24%,transparent)}55%{box-shadow:0 0 0 6px color-mix(in srgb,var(--sage-dark) 12%,transparent)}to{box-shadow:0 0 0 0 transparent}}@keyframes goal-success-check{0%{opacity:0;transform:scale(.72) rotate(-12deg)}}.rule-grid-example{margin-top:18px}.rule-example-grid{width:min(100%,370px);aspect-ratio:1;display:grid;grid-template-columns:repeat(9,1fr);border:2px solid var(--ink);background:#fff}.rule-example-grid>span{display:grid;place-items:center;border-right:1px solid #cfd6da;border-bottom:1px solid #cfd6da;color:var(--ink);font-family:var(--serif);font-size:clamp(.68rem,1.4vw,.9rem)}.rule-example-grid>span.box-right{border-right:2px solid var(--ink)}.rule-example-grid>span.box-bottom{border-bottom:2px solid var(--ink)}.rule-example-grid>span.example-row{background:#fff3cf}.rule-example-grid>span.example-column{background:#e4eee4}.rule-example-grid>span.example-box{box-shadow:inset 0 0 0 2px #2d679347}.rule-example-grid>span.example-target{position:relative;z-index:2;background:var(--saffron);box-shadow:inset 0 0 0 3px var(--ink);color:var(--ink)}.rule-grid-key{margin-top:12px;display:flex;flex-wrap:wrap;gap:8px 14px;color:var(--muted);font-size:.68rem}.rule-grid-key span{display:inline-flex;align-items:center;gap:6px}.rule-grid-key i{width:13px;height:13px;border:1px solid var(--line)}.rule-grid-key .row-key{background:#fff3cf}.rule-grid-key .column-key{background:#e4eee4}.rule-grid-key .box-key{box-shadow:inset 0 0 0 2px #2d679373}.rule-grid-key .target-key{background:var(--saffron);border-color:var(--ink)}.pause-overlay{position:absolute;top:0;right:0;bottom:0;left:0;z-index:10;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#f7f3eaf7;text-align:center}.pause-overlay .mascot{width:125px;height:130px}.pause-overlay h2{margin:5px 0}.pause-overlay p{margin-bottom:20px;font-size:.83rem}.board-tools{width:var(--puzzle-board-size);margin:18px auto 0}.edit-tools{display:flex;justify-content:center;gap:6px}.tool-button-wrap{position:relative;display:flex;border-radius:6px}.edit-tools button{min-width:67px;padding:8px;display:flex;align-items:center;justify-content:center;gap:5px;border:0;border-radius:4px;background:transparent;color:#5f6f7a;font-size:.68rem;cursor:pointer}.edit-tools button:hover,.edit-tools button.active{background:var(--blue-wash);color:var(--ink)}.edit-tools button:disabled{opacity:.35;cursor:default}.edit-tools svg{width:15px}.tool-button-wrap:focus-visible{outline:3px solid rgba(45,103,147,.22);outline-offset:2px}.tool-tooltip{position:absolute;z-index:30;left:50%;bottom:calc(100% + 9px);width:-moz-max-content;width:max-content;max-width:min(230px,72vw);padding:7px 9px;border-radius:5px;background:var(--ink);color:#fff;box-shadow:0 7px 20px #102a432e;font-size:.62rem;font-weight:600;line-height:1.35;text-align:center;opacity:0;visibility:hidden;pointer-events:none;transform:translate(-50%,4px);transform-origin:50% 100%;transition:opacity 125ms var(--ease-out-ui),transform 125ms var(--ease-out-ui)}.tool-tooltip:after{content:"";position:absolute;top:100%;left:50%;border:5px solid transparent;border-top-color:var(--ink);transform:translate(-50%)}.tool-button-wrap:focus-within .tool-tooltip,.tool-button-wrap:focus-visible .tool-tooltip{opacity:1;visibility:visible;transform:translate(-50%);transition-delay:0ms;transition-duration:0ms}@media(hover:hover)and (pointer:fine){.tool-button-wrap:hover .tool-tooltip{opacity:1;visibility:visible;transform:translate(-50%);transition-delay:.35s}.tool-button-wrap[data-instant]:hover .tool-tooltip{transition-delay:0ms;transition-duration:0ms}}.tool-button-wrap[data-tooltip-hidden] .tool-tooltip{opacity:0;visibility:hidden;transform:translate(-50%,4px)}.notes-symbol{font-family:var(--serif);font-size:1rem}.number-pad{margin-top:12px;display:grid;grid-template-columns:repeat(9,1fr);gap:5px}.number-pad button{min-width:0;min-height:48px;aspect-ratio:1.12;display:flex;flex-direction:column;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:4px;background:#fff;font-family:var(--serif);font-size:1.25rem;cursor:pointer}.number-pad button:hover{border-color:var(--ink);background:var(--blue-wash)}.puzzle-number-pad button:disabled{opacity:.45;cursor:default}.puzzle-number-pad button.digit-complete{opacity:.52;background:#ffffff94}.puzzle-number-pad[data-mode=notes] .number-key{border-color:#aebfcd;background:var(--blue-wash)}.puzzle-number-pad[data-mode=notes] .number-key>span{font-size:.9em}.number-pad button.selected-answer{border-color:var(--ink);background:var(--blue-wash);box-shadow:inset 0 0 0 1px var(--ink)}.number-pad small{margin-top:1px;color:var(--muted);font-family:sans-serif;font-size:.47rem}.number-pad .mobile-input-mode{display:none}.coach-panel.coach-chat{position:sticky;top:16px;height:min(790px,calc(100dvh - 134px));min-height:min(560px,calc(100dvh - 134px));padding:0;align-self:start;display:flex;flex-direction:column;overflow:hidden;border:1px solid #cec8bc;border-radius:10px;background:var(--paper);box-shadow:0 14px 38px #102a4314}.guided-practice-complete{position:sticky;top:16px;min-height:420px;padding:38px 30px;align-self:start;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;border:1px solid #c8d5c3;border-radius:10px;background:var(--paper);box-shadow:0 14px 38px #102a4314}.guided-practice-complete>svg{width:42px;height:42px;margin-bottom:24px;color:#4f8a63}.guided-practice-complete h2{margin:8px 0 14px;font-size:1.65rem;line-height:1.08}.guided-practice-complete p{margin:0 0 28px;color:var(--muted);line-height:1.6}.guided-practice-actions{width:100%;display:flex;flex-direction:column;align-items:stretch;gap:8px}.guided-practice-actions .button{width:100%;justify-content:center;text-align:center}.coach-chat-header{flex:0 0 auto;min-height:82px;padding:13px 15px;display:flex;align-items:center;gap:11px;border-bottom:1px solid var(--line);background:#fffdf8f5}.coach-status{flex:0 0 auto}.coach-status .puzzle-goal,.coach-status .exploration-banner{width:100%;margin:0;padding:9px 14px;border:0;border-bottom:1px solid var(--line);border-radius:0}.coach-status .puzzle-goal{background:#fffdf8b8}.coach-status .puzzle-goal.complete{background:#edf5e9}.coach-chat-avatar{position:relative;width:52px;height:52px;flex:0 0 52px;overflow:hidden;border:1px solid #c8d5c3;border-radius:50%;background:var(--sage)}.coach-chat-avatar .mascot{width:62px;height:67px;max-width:none;transform:translate(-5px,2px)}.coach-chat-header .eyebrow{font-size:.51rem}.coach-chat-header h2{margin:1px 0 2px;font-size:1.08rem;line-height:1.05}.coach-chat-header small{display:flex;align-items:center;gap:5px;color:var(--muted);font-size:.59rem}.coach-chat-header small i{width:7px;height:7px;border-radius:50%;background:#4f8a63;box-shadow:0 0 0 3px #4f8a631f}.coach-panel[aria-disabled=true] .coach-chat-header small i{background:#9b988f;box-shadow:none}.coach-thread-shell{position:relative;min-height:0;flex:1}.coach-thread{height:100%;overflow-y:auto;padding:18px 13px 22px;background:linear-gradient(#f7f3eae8,#f7f3eae8),radial-gradient(circle at 1px 1px,rgba(63,104,79,.2) 1px,transparent 1.2px);background-size:auto,18px 18px;scrollbar-color:#bbb7ad transparent;scrollbar-width:thin}.coach-new-turn{position:absolute;left:50%;bottom:12px;min-height:34px;padding:7px 11px;display:flex;align-items:center;gap:6px;border:1px solid #9eb49f;border-radius:999px;background:var(--paper);box-shadow:0 5px 16px #102a4324;color:var(--sage-dark);font-size:.61rem;font-weight:750;cursor:pointer;transform:translate(-50%)}.coach-new-turn:hover{background:#f3f7ef}.coach-turn{margin:0 0 12px;display:flex;align-items:flex-end;gap:7px}.coach-turn.coach{animation:coach-turn-in .26s cubic-bezier(.22,1,.36,1) both}.coach-turn.learner{justify-content:flex-end}.coach-turn-avatar{width:30px;height:30px;flex:0 0 30px;overflow:hidden;border:1px solid #ccd5c7;border-radius:50%;background:var(--sage)}.coach-turn-avatar .mascot{width:38px;height:42px;max-width:none;transform:translate(-4px,1px)}.coach-bubble{position:relative;max-width:88%;padding:11px 13px;border:1px solid rgba(16,42,67,.1);border-radius:13px 13px 13px 4px;background:#fff;box-shadow:0 2px 7px #102a430f}.coach-turn.learner .coach-bubble{border-color:#cad8e4;border-radius:13px 13px 4px;background:#e8f0f6}.coach-bubble p{margin:0;color:var(--ink);font-size:.82rem;line-height:1.45;white-space:pre-wrap}.coach-turn.coach .coach-bubble p{font-family:var(--serif);font-size:.88rem;line-height:1.4}.coach-clue-label{display:block;margin-bottom:5px;color:var(--sage-dark);font-size:.49rem;font-weight:800;letter-spacing:.11em;text-transform:uppercase}.coach-next-action{display:block;margin-top:8px;padding-top:8px;border-top:1px solid #ece8df;color:var(--ink-soft);font-size:.78rem;line-height:1.5}.coach-turn-speak{width:25px;height:25px;margin:7px -3px -4px auto;display:grid;place-items:center;border:0;border-radius:50%;background:transparent;color:var(--sage-dark);cursor:pointer}.coach-turn-speak:hover{background:var(--sage)}.coach-turn.pending .coach-bubble{min-width:54px}.coach-typing{min-height:18px;display:flex;align-items:center;justify-content:center;gap:4px}.coach-typing i{width:6px;height:6px;border-radius:50%;background:#718078;animation:coach-typing 1.1s ease-in-out infinite}.coach-typing i:nth-child(2){animation-delay:.12s}.coach-typing i:nth-child(3){animation-delay:.24s}.coach-chat-controls{flex:0 0 auto;padding:11px 12px 10px;border-top:1px solid var(--line);background:var(--paper)}.coach-quick-action{width:100%;min-height:38px;padding:8px 10px;display:flex;align-items:center;justify-content:center;gap:7px;border:1px solid #9eb49f;border-radius:999px;background:#f3f7ef;color:#31563f;font-size:.67rem;font-weight:750;cursor:pointer;transition:background-color .15s ease,transform .15s var(--ease-out-ui)}@media(hover:hover)and (pointer:fine){.coach-quick-action:hover:not(:disabled){background:#e5efdf;transform:translateY(-1px)}}.coach-quick-action small{padding-left:7px;border-left:1px solid #b9c9b6;color:var(--sage-dark);font-size:.55rem}.coach-quick-action:disabled{opacity:.46;cursor:not-allowed}.coach-composer{margin-top:8px;display:grid;grid-template-columns:minmax(0,1fr) 38px;align-items:end;gap:7px}.coach-composer textarea{width:100%;min-height:40px;max-height:88px;padding:10px 11px;resize:vertical;border:1px solid #cfc9bd;border-radius:17px;background:#fff;color:var(--ink);font:inherit;font-size:.68rem;line-height:1.35}.coach-composer textarea:focus{border-color:var(--sage-dark);outline:3px solid rgba(63,104,79,.12)}.coach-composer button{width:38px;height:38px;display:grid;place-items:center;border:0;border-radius:50%;background:var(--ink);color:#fff;cursor:pointer}.coach-composer button:hover:not(:disabled){background:#214660}.coach-composer button:disabled{background:#d6d3cb;color:#85847f;cursor:default}.coach-composer-note{margin:5px 45px 0 8px;color:var(--muted);font-size:.57rem;text-align:right}@keyframes coach-turn-in{0%{opacity:0;transform:translateY(7px) scale(.985)}}@keyframes coach-typing{0%,60%,to{opacity:.38;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}.library-count{padding-bottom:8px;color:var(--muted);font-size:.75rem}.lesson-list{border-top:1px solid var(--ink)}.lesson-row{min-height:128px;padding:18px 16px;display:grid;grid-template-columns:55px 1fr 160px;align-items:center;border-bottom:1px solid var(--line);transition:background-color .16s ease}@media(hover:hover)and (pointer:fine){.lesson-row:hover{background:#f4f6f1}}.lesson-index{align-self:start;padding-top:6px;color:var(--saffron-ink);font-family:var(--serif);font-size:.78rem}.lesson-row-copy>span{color:var(--sage-dark);text-transform:uppercase;letter-spacing:.1em;font-size:.58rem;font-weight:800}.lesson-row-copy h2{margin:5px 0;font-size:1.45rem}.lesson-row-copy p{max-width:600px;margin:0;color:var(--muted);font-size:.75rem}.lesson-row-meta{display:grid;grid-template-columns:1fr 1fr auto;align-items:center;gap:12px;color:var(--muted);font-size:.65rem}.lesson-row-meta svg{width:18px;color:var(--sage-dark)}.lesson-row.locked{background:#f4f1e9}.lesson-row.completed{background:#f1f5ed}.review-queue{margin-bottom:28px;padding:22px 24px;display:flex;align-items:center;justify-content:space-between;gap:24px;border:1px solid #dfc786;background:#fff8e5}.review-queue h2{margin:4px 0;font-size:1.35rem}.review-queue p{margin:0;font-size:.7rem}.review-queue>div:last-child{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:7px}.advanced-preview{margin-top:44px;padding:34px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:30px}.advanced-preview h2{margin-bottom:8px}.advanced-preview p{max-width:720px;margin:0;font-size:.82rem}.lesson-header{display:flex;justify-content:space-between;margin-bottom:25px;color:var(--muted);font-size:.72rem}.lesson-layout{display:grid;grid-template-columns:180px 1fr;gap:40px}.lesson-steps{align-self:start;position:sticky;top:35px}.lesson-steps>button{width:100%;min-height:42px;padding:0;display:flex;align-items:center;gap:10px;border:0;background:transparent;color:var(--muted);font-size:.75rem;text-align:left;cursor:pointer}.lesson-steps>button i{width:23px;height:23px;flex:0 0 23px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;font-style:normal;font-size:.62rem}.lesson-steps>button.active{color:var(--ink);font-weight:700}.lesson-steps>button.active i{background:var(--ink);border-color:var(--ink);color:#fff}.lesson-steps>button:disabled{opacity:.35;cursor:not-allowed}.lesson-outcome{margin-top:30px;padding:17px;display:flex;align-items:flex-start;gap:10px;border:1px solid var(--line);border-radius:5px}.lesson-outcome svg{flex:0 0 auto;width:16px;color:var(--saffron)}.lesson-outcome p{margin:0;display:flex;flex-direction:column;gap:5px}.lesson-outcome strong{font-family:var(--serif);font-size:.78rem}.lesson-outcome span{color:var(--muted);font-size:.62rem;line-height:1.5}.lesson-content{min-height:650px;padding:44px;border:1px solid var(--line);border-radius:8px;overflow:hidden}.lesson-content>h1{margin:0 0 34px;font-size:3.3rem}.lesson-stage{display:grid;grid-template-columns:1fr 320px;gap:40px;align-items:center}.lesson-prose .lead{color:var(--ink);font-family:var(--serif);font-size:1.1rem;line-height:1.65}.lesson-prose h2{margin:25px 0 20px;line-height:1.08}.lesson-prose p:not(.lead){font-size:.83rem}.lesson-prose>p:not(.lead){margin-bottom:0}.lesson-prose .button{margin-top:15px}.lesson-illustration{width:100%;max-height:410px;-o-object-fit:contain;object-fit:contain}.worked-example{display:grid;grid-template-columns:1.2fr .8fr;gap:40px}.worked-example .mini-board{max-width:430px}.example-label{color:var(--sage-dark);text-transform:uppercase;letter-spacing:.11em;font-size:.62rem;font-weight:800}.worked-example h2,.try-stage h2{margin:8px 0}.worked-example p,.try-stage p{font-size:.8rem}.proof-steps{align-self:center;padding:26px;background:#f3f5ef;border-radius:6px}.proof-steps p{display:flex;align-items:flex-start;gap:10px}.proof-steps p span{flex:0 0 auto;width:21px;height:21px;display:grid;place-items:center;border-radius:50%;background:var(--sage-dark);color:#fff;font-size:.63rem}.proof-steps .button{margin-top:10px}.try-stage{display:grid;grid-template-columns:1.2fr .8fr;gap:35px}.try-board{padding-top:20px}.try-row{margin-top:28px;display:grid;grid-template-columns:repeat(9,1fr);border:2px solid var(--ink)}.try-row button{aspect-ratio:1;min-width:0;padding:0;border:0;border-right:1px solid #b8c1c6;background:#fff;font-family:var(--serif);font-size:1.25rem;cursor:pointer}.try-row button:nth-child(3n){border-right:2px solid var(--ink)}.try-row button:disabled{color:var(--ink);cursor:default}.try-row button:not(:disabled){background:#edf2ea}.try-row button span{font-size:.62rem;color:var(--sage-dark)}.try-row button.correct{background:var(--sage);box-shadow:inset 0 0 0 3px var(--sage-dark)}.try-row button.wrong{background:#f7e5e1;box-shadow:inset 0 0 0 3px var(--coral)}.lesson-choice-grid{margin-top:26px;display:flex;flex-direction:column;gap:9px}.lesson-choice-grid button{min-height:56px;padding:11px 14px;display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:5px;background:#fff;text-align:left;cursor:pointer}.lesson-choice-grid button>span{flex:0 0 auto;width:27px;height:27px;display:grid;place-items:center;border-radius:50%;background:var(--blue-wash);font-size:.68rem;font-weight:800}.lesson-choice-grid button:hover{border-color:var(--ink)}.lesson-choice-grid button.correct{border-color:var(--sage-dark);background:var(--sage)}.lesson-choice-grid button.wrong{border-color:var(--coral);background:#f7e5e1}.lesson-concept-mark{max-width:430px;min-height:260px;display:grid;place-items:center;align-content:center;gap:14px;border:1px solid var(--line);background:#f3f5ef}.lesson-concept-mark>span{width:85px;height:85px;display:grid;place-items:center;border-radius:50%;background:var(--saffron);font-family:var(--serif);font-size:2.4rem}.lesson-concept-mark p{margin:0;font-family:var(--serif);color:var(--ink)}.advanced-list{margin-top:0}.try-feedback{align-self:center;min-height:270px;padding:22px;display:flex;flex-direction:column;justify-content:center;align-items:center;background:#f8f5ed;border:1px solid var(--line);border-radius:6px;text-align:center}.try-feedback .mascot{width:125px;height:130px}.try-feedback p{display:flex;flex-direction:column}.try-feedback strong{color:var(--ink);font-family:var(--serif);font-size:1rem}.try-feedback span{font-size:.7rem}.lesson-complete{max-width:600px;margin:-10px auto 0;text-align:center}.lesson-complete img{height:250px;margin:0 auto 10px}.lesson-complete h2{font-size:2rem}.evidence-complete h2{margin:0 0 24px;line-height:1.08;text-wrap:balance}.evidence-complete>.eyebrow{display:block;margin-bottom:24px}.lesson-complete.evidence-complete>p{margin-bottom:40px}.evidence-complete>div:last-child{margin-top:32px}.lesson-complete p{max-width:480px;margin:0 auto 24px}.lesson-complete>div{display:flex;justify-content:center;gap:8px}.pedagogy-content{min-width:0}.lesson-content-header{margin-bottom:30px;display:flex;align-items:flex-start;justify-content:space-between;gap:24px}.lesson-content-header h1{margin:4px 0 0;font-size:clamp(2.4rem,5vw,3.3rem)}.evidence-badge{flex:0 0 auto;min-width:132px;padding:11px 13px;display:flex;flex-direction:column;border-left:3px solid var(--sage-dark);background:#f1f5ed}.evidence-badge span,.evidence-badge small{color:var(--muted);font-size:.58rem}.evidence-badge strong{margin-top:3px;text-transform:capitalize;font-family:var(--serif);font-size:.9rem}.evidence-badge.expanded{max-width:390px;margin:0 auto;padding:11px 13px;border-left:0;border-top:3px solid var(--sage-dark);text-align:left}.evidence-badge.expanded strong{margin-top:3px}.evidence-badge.expanded small{margin-top:8px}.pedagogy-overview{display:grid;grid-template-columns:minmax(0,1fr);max-width:820px;align-items:start}.prerequisite-note{margin:22px 0 0;padding-top:15px;border-top:1px solid var(--line);color:var(--muted)}.prerequisite-note strong{color:var(--ink)}.prerequisite-callout{margin-top:14px;padding:12px;display:grid;grid-template-columns:20px 1fr auto;gap:9px;align-items:center;border:1px solid #e1cd96;background:#fff8e7}.prerequisite-callout>svg{width:17px;color:var(--saffron-ink)}.prerequisite-callout p{margin:0;display:flex;flex-direction:column}.prerequisite-callout p strong{font-family:var(--serif);font-size:.72rem}.prerequisite-callout p span,.prerequisite-callout .text-link{font-size:.58rem}.overview-actions{margin-top:32px;display:flex;flex-wrap:wrap;gap:7px}.overview-actions .button{margin-top:0}.model-stage,.practice-workspace{display:grid;grid-template-columns:minmax(320px,1.08fr) minmax(250px,.92fr);gap:36px;align-items:start}.model-stage h2,.practice-heading h2{margin:7px 0 14px;line-height:1.08}.proof-narration{align-self:center;padding:28px;border-left:3px solid var(--saffron);background:#fff8e7}.proof-narration>span{color:var(--saffron-ink);text-transform:uppercase;letter-spacing:.1em;font-size:.58rem;font-weight:800}.proof-narration h3{margin:8px 0;font-family:var(--serif);font-size:1.3rem;line-height:1.35}.proof-narration p{font-size:.75rem}.proof-narration>.button{margin-top:18px}.lesson-board-figure{margin:15px 0 0}.lesson-board-frame{--lesson-axis-size: 20px;width:min(100%,520px);display:grid;grid-template-columns:var(--lesson-axis-size) minmax(0,1fr);grid-template-rows:var(--lesson-axis-size) minmax(0,1fr)}.lesson-board-column-labels,.lesson-board-row-labels{color:var(--muted);font:700 .55rem/1 sans-serif;font-variant-numeric:tabular-nums;-webkit-user-select:none;-moz-user-select:none;user-select:none}.lesson-board-column-labels{grid-column:2;display:grid;grid-template-columns:repeat(9,1fr)}.lesson-board-row-labels{grid-row:2;display:grid;grid-template-rows:repeat(9,1fr)}.lesson-board-column-labels span,.lesson-board-row-labels span{display:grid;place-items:center}.lesson-board{grid-column:2;grid-row:2;width:100%;aspect-ratio:1;display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,minmax(0,1fr));border:2px solid var(--ink);background:#fff;box-shadow:0 12px 30px #102a4314}.lesson-board-cell{min-width:0;min-height:0;position:relative;display:grid;place-items:center;padding:0;border:0;border-right:1px solid #cfd6da;border-bottom:1px solid #cfd6da;background:#fff;color:#1f669a;font-family:var(--serif);font-size:clamp(.85rem,2vw,1.35rem)}.lesson-board-cell:disabled{opacity:1}.lesson-board.selectable .lesson-board-cell{cursor:pointer}.lesson-board.selectable .lesson-board-cell:hover,.lesson-board.selectable .lesson-board-cell:focus-visible{z-index:5;background:#fff2c8;outline:3px solid var(--saffron);outline-offset:-3px}.lesson-board-cell.box-right{border-right:2px solid var(--ink)}.lesson-board-cell.box-bottom{border-bottom:2px solid var(--ink)}.lesson-board-cell.given{color:var(--ink);font-weight:700}.lesson-board-cell.related{background:#f3f5f0}.lesson-board-cell.pattern{background:#fff4d3}.lesson-board-cell.conclusion{box-shadow:inset 0 0 0 2px #2d6793}.lesson-board-cell.highlighted{z-index:2;background:linear-gradient(145deg,#fff1bd,#ffe29a);box-shadow:inset 0 0 0 1.5px #7a5200b8,inset 0 1px #ffffffb8,inset 0 -3px 8px #7a52000f}.lesson-board-cell.conclusion{z-index:3;box-shadow:inset 0 0 0 3px #2d6793}.lesson-candidates i.candidate-sage,.lesson-candidates i.candidate-saffron{width:1.15em;height:1.15em;margin:auto;border-radius:50%;display:grid;place-items:center;color:var(--ink);font-weight:800}.lesson-candidates i.candidate-sage{background:#b9cfad}.lesson-candidates i.candidate-saffron{background:#f4c65e}.lesson-board-cell.selected{z-index:4;background:#dce9f4;box-shadow:inset 0 0 0 3px #2d6793}.lesson-board-cell.selected.correct{background:var(--sage);box-shadow:inset 0 0 0 3px var(--sage-dark)}.lesson-board-cell.selected.wrong{background:#f7e5e1;box-shadow:inset 0 0 0 3px var(--coral)}.lesson-candidates{width:100%;height:100%;padding:2px;display:grid;grid-template-columns:repeat(3,1fr)}.lesson-candidates i{display:grid;place-items:center;color:#4e6d82;font:normal clamp(.35rem,.8vw,.56rem) sans-serif}.lesson-board-figure figcaption{max-width:500px;margin:9px 0 0 20px;color:var(--muted);font-size:.65rem;line-height:1.5}.rules-primer>header{margin-bottom:24px;display:flex;align-items:flex-start;justify-content:space-between;gap:24px}.rules-primer>header>div:first-child{max-width:660px}.rules-primer-kicker{margin:17px 0 4px;display:block;color:var(--sage-dark);font-size:.67rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.rules-primer h2{margin-bottom:8px;font-size:clamp(1.7rem,3vw,2.55rem);line-height:1.08}.rules-primer header p{max-width:620px;margin:0;font-size:.78rem;line-height:1.65}.rules-primer-progress{padding-top:8px;display:flex;gap:5px}.rules-primer-progress i{width:20px;height:4px;background:#ddd9d0}.rules-primer-progress i.filled{background:var(--saffron)}.rules-primer-workspace{min-height:500px;display:grid;grid-template-columns:minmax(0,1.25fr) minmax(240px,.75fr);border-top:1px solid var(--line);animation:rules-primer-enter .26s ease-out both}.rules-visual{min-height:500px;display:grid;place-content:center;background:#f7f5ee;overflow:hidden}.rules-primer-action{padding:42px 30px;display:flex;flex-direction:column;justify-content:center;border-left:1px solid var(--line);background:#fffdf8}.rules-primer-action>strong{font-family:var(--serif);font-size:1.15rem;line-height:1.35}.rules-primer-action>.button{align-self:flex-start;margin-top:20px}.rules-primer-note{margin:0;color:var(--muted);font-size:.72rem;line-height:1.6}.rules-binary-choice{margin-top:18px;display:grid;grid-template-columns:1fr 1fr;gap:8px}.rules-binary-choice button{min-height:52px;border:1px solid #cfd6da;border-radius:4px;background:#fff;color:var(--ink);font-weight:800;cursor:pointer}.rules-binary-choice button:hover,.rules-binary-choice button:focus-visible{border-color:var(--ink);outline:2px solid var(--saffron);outline-offset:2px}.rules-binary-choice button.correct{border-color:var(--sage-dark);background:var(--sage)}.rules-binary-choice button.wrong{border-color:var(--coral);background:#fbece8}.rules-primer-action>p.correct,.rules-primer-action>p.wrong{margin:16px 0 0;padding:13px 14px;display:flex;align-items:flex-start;gap:9px;border:1px solid;border-left-width:4px;border-radius:4px;font-size:.76rem;font-weight:700;line-height:1.5}.rules-primer-action>p.correct{border-color:#9eb89f;background:#edf5e9;color:#315d3f}.rules-primer-action>p.wrong{border-color:#d6a19a;background:#fbece8;color:#984a3f}.rules-primer-action>p svg{width:18px;margin-top:1px;flex:0 0 auto}.rules-target-square,.rules-line>div,.rules-box>div,.rules-overlap>div,.rules-full-grid>div{position:relative;display:grid;place-items:center;border-right:1px solid #cbd2d5;border-bottom:1px solid #cbd2d5;background:#fff;color:var(--ink);font-family:var(--serif);font-size:1.4rem;font-weight:700}.rules-target-square,.rules-line>div.target,.rules-box>div.target,.rules-overlap>div.target,.rules-full-grid>div.target{z-index:2;background:#fff4d3;box-shadow:inset 0 0 0 4px var(--saffron-ink)}.rules-target-square:after,.rules-line>div.target:after,.rules-box>div.target:after,.rules-overlap>div.target:after,.rules-full-grid>div.target:after{content:"?";color:#92701f;font-family:var(--sans);font-size:.85rem;font-weight:800}.rules-visual-square{grid-template-columns:1fr;justify-items:center;gap:30px}.rules-target-square{width:170px;height:170px;border:1px solid var(--ink)}.rules-number-range{display:flex;gap:6px}.rules-number-range span{width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:#fff;color:var(--muted);font-size:.65rem;font-weight:700}.rules-line{border-top:2px solid var(--ink);border-left:2px solid var(--ink)}.rules-line-row{width:100%;grid-template-columns:repeat(9,1fr)}.rules-line-row>div{aspect-ratio:1}.rules-line-row>div:last-child{border-right:2px solid var(--ink)}.rules-line-row>div{border-bottom:2px solid var(--ink)}.rules-line-column{--rules-column-cell-size: 52px;width:100%;grid-template-columns:var(--rules-column-cell-size);grid-template-rows:repeat(9,var(--rules-column-cell-size));justify-content:center}.rules-line-column>div{border-right:2px solid var(--ink)}.rules-line-column>div:last-child{border-bottom:2px solid var(--ink)}.rules-box{width:min(80%,330px);display:grid;grid-template-columns:repeat(3,1fr);border-top:3px solid var(--ink);border-left:3px solid var(--ink)}.rules-box-stage{width:100%;grid-template-columns:100%;justify-items:center}.rules-box>div{aspect-ratio:1}.rules-box>div:nth-child(3n){border-right:3px solid var(--ink)}.rules-box>div:nth-child(n+7){border-bottom:3px solid var(--ink)}.rules-overlap{position:relative;width:min(85%,390px);display:grid;grid-template-columns:repeat(5,1fr);background:transparent;overflow:visible}.rules-overlap>div{aspect-ratio:1;opacity:0}.rules-overlap>div.visible{opacity:1}.rules-overlap>div:nth-child(7),.rules-overlap>div:nth-child(8),.rules-overlap>div:nth-child(9),.rules-overlap>div:nth-child(12),.rules-overlap>div:nth-child(13),.rules-overlap>div:nth-child(14),.rules-overlap>div:nth-child(17),.rules-overlap>div:nth-child(18),.rules-overlap>div:nth-child(19){background:#edf3e9}.rules-overlap>div:nth-child(7),.rules-overlap>div:nth-child(8),.rules-overlap>div:nth-child(9){border-top:3px solid var(--sage-dark)}.rules-overlap>div:nth-child(17),.rules-overlap>div:nth-child(18),.rules-overlap>div:nth-child(19){border-bottom:3px solid var(--sage-dark)}.rules-overlap>div:nth-child(7),.rules-overlap>div:nth-child(12),.rules-overlap>div:nth-child(17){border-left:3px solid var(--sage-dark)}.rules-overlap>div:nth-child(9),.rules-overlap>div:nth-child(14),.rules-overlap>div:nth-child(19){border-right:3px solid var(--sage-dark)}.rules-overlap>div:nth-child(5n+1).visible{border-left:2px solid var(--ink)}.rules-overlap>div:nth-child(-n+5).visible{border-top:2px solid var(--ink)}.rules-overlap .row-label,.rules-overlap .column-label,.rules-overlap .box-label{position:absolute;color:var(--muted);font-size:.57rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.rules-overlap .row-label{right:-38px;top:47%}.rules-overlap .column-label{top:-24px;left:42%}.rules-overlap .box-label{left:21%;bottom:-24px}.rules-full-grid{width:min(88%,440px);display:grid;grid-template-columns:repeat(9,1fr);border-top:2px solid var(--ink);border-left:2px solid var(--ink)}.rules-full-grid-stage{width:100%;grid-template-columns:100%;justify-items:center}.rules-full-grid>div{aspect-ratio:1;font-size:clamp(.75rem,2vw,1.15rem)}.rules-full-grid>div:nth-child(9n){border-right:2px solid var(--ink)}.rules-full-grid>div:nth-child(n+73){border-bottom:2px solid var(--ink)}.rules-full-grid>div.box-right{border-right:2px solid var(--ink)}.rules-full-grid>div.box-bottom{border-bottom:2px solid var(--ink)}@keyframes rules-primer-enter{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media(max-width:880px){.rules-primer-workspace{grid-template-columns:1fr}.rules-visual{min-height:390px}.rules-primer-action{padding:24px;border-top:1px solid var(--line);border-left:0}}@media(max-width:520px){.rules-primer>header{flex-direction:column}.rules-primer-workspace,.rules-visual{min-height:330px}.rules-target-square{width:135px;height:135px}.rules-number-range span{width:24px;height:24px;font-size:.55rem}.rules-line-row{width:100%}.rules-line-column{--rules-column-cell-size: 34px}.rules-box{width:260px}.rules-overlap{width:290px}}@media(prefers-reduced-motion:reduce){.rules-primer-workspace{animation:none}}.practice-heading{margin-bottom:22px;display:flex;justify-content:space-between;gap:20px}.practice-heading p{max-width:700px;margin:0;font-size:.76rem}.practice-progress{min-width:95px;padding-top:7px;display:flex;gap:4px}.practice-progress i{width:17px;height:4px;background:#ddd9d0}.practice-progress i.filled{background:var(--saffron)}.practice-response{min-width:0}.practice-response .lesson-choice-grid{margin-top:0}.practice-response .lesson-choice-grid button:disabled{color:inherit;cursor:default}.cell-task-callout{padding:20px;border:1px solid #d7e1d1;background:#f1f5ed}.cell-task-callout svg{width:20px;color:var(--sage-dark)}.cell-task-callout h3{margin:7px 0 4px}.cell-task-callout p{margin:0;font-size:.7rem}.process-feedback{min-height:112px;margin-top:16px;padding:15px;display:grid;grid-template-columns:58px 1fr;gap:12px;align-items:center;border:1px solid var(--line);background:#f8f5ed}.process-feedback.wrong{border-color:#e5b8af;background:#fcf0ed}.process-feedback.correct{border-color:#b9cdb4;background:#eef5ea}.process-feedback .mascot{width:58px;height:70px}.process-feedback p{margin:0;display:flex;flex-direction:column;gap:4px}.process-feedback strong{font-family:var(--serif);font-size:.84rem}.process-feedback span,.process-feedback em{color:var(--muted);font-size:.64rem;line-height:1.45}.process-feedback em{color:var(--ink);font-style:normal}.lesson-hint{margin-top:10px;padding:11px 12px;display:flex;align-items:center;gap:8px;border-left:3px solid var(--saffron);background:#fff8e7;font-size:.68rem;line-height:1.5}.lesson-hint svg,.hint-button svg{flex:0 0 auto;width:15px}.hint-button{margin-top:12px;display:inline-flex;align-items:center;gap:5px}.practice-next-action{margin-top:16px;padding-top:15px;border-top:1px solid var(--line)}.completion-celebration{position:relative;isolation:isolate;width:190px;height:160px;margin:-10px auto 20px;display:grid;place-items:center}.completion-glow{position:absolute;z-index:-2;width:170px;height:170px;border-radius:50%;background:radial-gradient(circle,rgba(138,171,132,.34) 0 34%,rgba(138,171,132,.12) 53%,transparent 72%);animation:completion-glow-arrive .9s cubic-bezier(.05,.7,.1,1) both}.completion-sparks{position:absolute;top:0;right:0;bottom:0;left:0;z-index:-1;pointer-events:none}.completion-sparks i{--spark-angle: 0deg;--spark-distance: -70px;position:absolute;top:50%;left:50%;width:5px;height:15px;border-radius:999px;background:var(--sage-dark);box-shadow:0 0 0 4px #8aab841f;opacity:0;transform-origin:50% 50%;animation:completion-spark-bloom 1.2s cubic-bezier(.05,.7,.1,1) both}.completion-sparks i:nth-child(1){--spark-angle: 0deg;--spark-distance: -72px}.completion-sparks i:nth-child(2){--spark-angle: 45deg;--spark-distance: -78px;animation-delay:45ms}.completion-sparks i:nth-child(3){--spark-angle: 90deg;--spark-distance: -68px;animation-delay:90ms}.completion-sparks i:nth-child(4){--spark-angle: 135deg;--spark-distance: -76px;animation-delay:30ms}.completion-sparks i:nth-child(5){--spark-angle: 180deg;--spark-distance: -72px;animation-delay:75ms}.completion-sparks i:nth-child(6){--spark-angle: 225deg;--spark-distance: -80px;animation-delay:15ms}.completion-sparks i:nth-child(7){--spark-angle: 270deg;--spark-distance: -69px;animation-delay:105ms}.completion-sparks i:nth-child(8){--spark-angle: 315deg;--spark-distance: -77px;animation-delay:60ms}.evidence-complete .completion-celebration .mascot{position:relative;z-index:1;width:135px;height:150px;margin:0 auto;filter:drop-shadow(0 10px 16px rgba(16,42,67,.12));animation:completion-mascot-arrive .7s 80ms cubic-bezier(.05,.7,.1,1) both}@keyframes completion-mascot-arrive{0%{opacity:0;transform:translateY(12px) scale(.92)}65%{opacity:1;transform:translateY(-2px) scale(1.025)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes completion-glow-arrive{0%{opacity:0;transform:scale(.62)}62%{opacity:1;transform:scale(1.08)}to{opacity:.78;transform:scale(1)}}@keyframes completion-spark-bloom{0%{opacity:0;transform:translate(-50%,-50%) rotate(var(--spark-angle)) translateY(-24px) scale(.3)}18%{opacity:.95}72%{opacity:.72;transform:translate(-50%,-50%) rotate(var(--spark-angle)) translateY(var(--spark-distance)) scale(1)}to{opacity:0;transform:translate(-50%,-50%) rotate(var(--spark-angle)) translateY(calc(var(--spark-distance) - 9px)) scale(.55)}}@media(prefers-reduced-motion:reduce){.completion-sparks{display:none}.completion-glow,.evidence-complete .completion-celebration .mascot{animation:none}.completion-glow{opacity:.6}}@media(max-width:980px){.pedagogy-layout{grid-template-columns:145px minmax(0,1fr);gap:20px}.pedagogy-content{padding:30px}.pedagogy-overview,.model-stage,.practice-workspace{grid-template-columns:1fr}.proof-narration{border-left:0;border-top:3px solid var(--saffron)}}@media(max-width:680px){.pedagogy-layout{display:block}.pedagogy-layout>.lesson-steps{position:static;margin-bottom:12px;display:grid;grid-template-columns:repeat(4,1fr);gap:4px}.pedagogy-layout>.lesson-steps>.eyebrow,.pedagogy-layout>.lesson-steps>.lesson-outcome{display:none}.pedagogy-layout>.lesson-steps>button{min-height:58px;flex-direction:column;justify-content:center;gap:4px;font-size:.55rem}.pedagogy-content{min-height:0;padding:20px 16px 26px;scroll-margin-top:66px}.lesson-content-header,.practice-heading{flex-direction:column}.lesson-content-header{margin-bottom:22px}.lesson-prose h2{margin-bottom:16px}.overview-actions{margin-top:24px}.evidence-complete .completion-celebration{margin-bottom:16px}.evidence-complete>.eyebrow{margin-bottom:20px}.evidence-complete h2{margin-bottom:20px}.lesson-complete.evidence-complete>p{margin-bottom:32px}.evidence-complete>div:last-child{margin-top:24px;flex-direction:column;gap:12px}.evidence-complete>div:last-child .button{width:100%}.evidence-badge,.lesson-board{width:100%}.lesson-board-cell>small{display:none}.lesson-candidates i{font-size:clamp(.31rem,1.9vw,.52rem)}.practice-progress{padding-top:0}.process-feedback{grid-template-columns:48px 1fr}.process-feedback .mascot{width:48px;height:58px}.practice-next-action .button{width:100%}.review-queue{align-items:stretch;flex-direction:column}.review-queue>div:last-child{justify-content:flex-start}}.review-heading{min-height:210px;padding:0 35px 0 40px;display:flex;align-items:center;justify-content:space-between;background:#eef3e9;border-radius:8px;overflow:hidden}.review-heading h1{max-width:760px;margin-bottom:10px;font-size:clamp(2.2rem,4vw,3.5rem)}.review-heading p{margin:0}.review-heading .mascot{width:180px;height:200px;align-self:flex-end}.review-summary{margin:16px 0;padding:22px 28px;display:grid;grid-template-columns:repeat(4,1fr) 125px;align-items:center;border:1px solid var(--line);border-radius:8px}.review-summary>div:not(.progress-ring){min-height:50px;padding-left:22px;border-left:1px solid var(--line);display:flex;flex-direction:column;gap:6px}.review-summary>div:first-child{border-left:0;padding-left:0}.review-summary span{color:var(--muted);font-size:.65rem}.review-summary strong{font-family:var(--serif);font-size:1.25rem}.review-grid{display:grid;grid-template-columns:1fr 330px;gap:16px}.review-mistakes,.technique-review{padding:26px;border:1px solid var(--line);border-radius:8px}.review-mistakes article{margin-top:18px;padding:18px;display:grid;grid-template-columns:27px 1fr 25px;gap:13px;background:#fbf1ee;border:1px solid #efd4cf;border-radius:5px}.review-mistakes article>i{width:24px;height:24px;display:grid;place-items:center;border-radius:50%;background:var(--coral);color:#fff;font-style:normal;font-size:.67rem}.review-mistakes h3{margin:0 0 5px;font-size:.96rem}.review-mistakes p{margin-bottom:10px;font-size:.69rem}.free-mistake-summary{margin:0 0 16px;padding:14px 16px;border-left:3px solid var(--saffron);background:#fff9e9;color:var(--ink);line-height:1.6}.review-mistakes .text-button{font-size:.66rem}.mistake-mark{color:var(--coral)}.mistake-mark svg{width:16px}.technique-review>.eyebrow{margin-bottom:16px}.technique-review>div:not(.coach-summary){padding:9px 0;display:grid;grid-template-columns:22px 1fr auto;align-items:center;border-bottom:1px solid #eee9df;font-size:.74rem}.technique-review>div svg{width:16px;color:#bcc1bd}.technique-review>div svg.complete{color:var(--sage-dark)}.technique-review small{color:var(--muted);font-size:.59rem}.coach-summary{margin-top:22px;display:flex;align-items:center;gap:10px}.coach-summary .mascot{width:70px;height:75px}.coach-summary p{margin:0;display:flex;flex-direction:column}.coach-summary strong{font-family:var(--serif);font-size:.82rem}.coach-summary span{color:var(--muted);font-size:.63rem;line-height:1.45}.review-next{margin-top:16px;padding:26px 30px;display:flex;align-items:center;justify-content:space-between;gap:30px;background:var(--ink);color:#fff;border-radius:8px}.review-next .eyebrow{color:#b9ceb9}.review-next h2{margin-bottom:6px}.review-next p{margin:0;color:#cad3da;font-size:.76rem}.review-next>div:last-child{display:flex;gap:8px}.review-next .button-outline{border-color:#fff;color:#fff}.empty-progress{min-height:330px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}.empty-progress img{width:170px;height:160px;-o-object-fit:contain;object-fit:contain}.empty-progress p{max-width:330px;font-size:.75rem}.history-gate{margin-top:18px;padding:16px;display:grid;grid-template-columns:25px 1fr auto;align-items:center;gap:12px;border:1px solid #d9c98d;background:#fff8e5;border-radius:5px}.history-gate>svg{width:17px;color:#8a6715}.history-gate p{margin:0;display:flex;flex-direction:column}.history-gate strong{color:var(--ink);font-family:var(--serif);font-size:.8rem}.history-gate span{color:var(--muted);font-size:.62rem}.upgrade-page{min-height:100vh;background:radial-gradient(circle at 50% 30%,#eef1e8,transparent 30%),var(--ivory)}.upgrade-main{width:min(940px,calc(100% - 40px));margin:0 auto;padding:40px 0 55px}.upgrade-heading{max-width:670px;margin:0 auto 38px;text-align:center}.upgrade-heading h1{margin-bottom:15px;font-size:clamp(2.7rem,5vw,4.2rem)}.upgrade-heading p{margin:0}.pricing-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.price-plan{min-height:560px;position:relative;padding:35px;display:flex;flex-direction:column;border:1px solid var(--line);border-radius:8px;background:#fffdf8e0}.price-plan.featured{border-color:#d99917;box-shadow:0 18px 45px #6a4c0b1a}.popular{position:absolute;top:-12px;left:28px;padding:5px 12px;border-radius:3px;background:var(--saffron);color:#5d4108;text-transform:uppercase;letter-spacing:.08em;font-size:.58rem;font-weight:800}.price-owl{position:absolute;right:25px;top:25px;width:100px;height:120px}.price-owl .mascot{width:100%;height:100%}.plan-name{font-family:var(--serif);font-size:1.25rem}.price-plan h2{margin:7px 0;font-size:2.4rem}.price-plan h2 small{font-family:sans-serif;color:var(--muted);font-size:.7rem;font-weight:500}.price-plan>p{margin-bottom:22px;font-size:.75rem}.price-plan ul{margin:0 0 28px;padding:0;list-style:none;display:flex;flex-direction:column;gap:12px}.price-plan li{display:flex;align-items:center;gap:9px;font-size:.76rem}.price-plan li svg{width:15px;color:var(--sage-dark);stroke-width:3}.price-plan>.button{margin-top:auto}.checkout-status{max-width:650px;margin:18px auto 0;padding:12px 15px;border:1px solid #dfcf9f;background:#fff8e5;border-radius:4px;text-align:center;font-size:.74rem}.checkout-trust{margin-top:25px;display:flex;justify-content:center;gap:35px;color:var(--muted);font-size:.65rem}.checkout-trust span{display:flex;align-items:center;gap:6px}.checkout-trust svg{width:16px}.settings-page{max-width:800px}.notebook-callout{margin-bottom:22px;padding:17px 20px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:15px;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}.notebook-callout>svg,.notebook-count svg{color:var(--sage-dark)}.notebook-callout .eyebrow{margin-bottom:3px}.notebook-callout strong{font-family:var(--serif);font-size:1rem}.practice-page{max-width:1060px}.notebook-heading{align-items:end}.notebook-heading h1{max-width:680px}.notebook-count{padding:10px 14px;display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);border-radius:99px;background:var(--paper);font-size:.76rem;font-weight:700}.practice-layout{display:grid;grid-template-columns:minmax(420px,590px) minmax(260px,340px);align-items:start;gap:42px}.practice-board .sudoku-board{width:100%}.practice-prompt,.notebook-gate{padding:28px;border:1px solid var(--line);border-radius:8px;background:var(--paper);box-shadow:var(--shadow)}.practice-prompt .mascot,.notebook-gate .mascot{width:105px;height:115px;margin:-14px auto 10px}.practice-prompt h2{margin-bottom:10px}.practice-prompt p{font-size:.84rem}.practice-prompt.correct{border-color:#9eb89f}.practice-prompt.wrong{border-color:#d19b94}.notebook-gate{max-width:650px;margin:55px auto;text-align:center}.notebook-gate h1{font-size:clamp(2.2rem,5vw,3.8rem)}.settings-section{margin-bottom:20px;padding:26px;border:1px solid var(--line);border-radius:8px}.settings-section>h2{margin-bottom:18px}.coach-preference{min-height:105px;padding:18px 0;display:grid;grid-template-columns:35px 1fr;align-items:start;border-top:1px solid #ebe6dd}.coach-preference>svg{width:18px;color:var(--sage-dark)}.coach-preference>div>strong,.coach-preference>div>span{display:block}.coach-preference>div>strong{font-family:var(--serif);font-size:.9rem}.coach-preference>div>span{margin-top:3px;color:var(--muted);font-size:.67rem}.segmented-control{margin-top:12px;display:inline-grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:5px;overflow:hidden}.segmented-control button{min-height:36px;padding:0 14px;border:0;border-right:1px solid var(--line);background:var(--paper);text-transform:capitalize;font-size:.72rem;cursor:pointer}.segmented-control button:last-child{border-right:0}.segmented-control button.active{background:var(--ink);color:#fff}.setting-row{min-height:76px;display:grid;grid-template-columns:35px 1fr auto;align-items:center;border-top:1px solid #ebe6dd}.setting-row>svg{width:18px;color:var(--sage-dark)}.setting-row p{margin:0;display:flex;flex-direction:column}.setting-row strong{color:var(--ink);font-family:var(--serif);font-size:.9rem}.setting-row span{color:var(--muted);font-size:.67rem}.toggle{width:42px;height:24px;padding:2px;border:0;border-radius:13px;background:#c9cbc8;cursor:pointer;transition:background .2s ease}.toggle i{display:block;width:20px;height:20px;border-radius:50%;background:#fff;transition:transform .2s ease;box-shadow:0 1px 3px #0000002e}.toggle.on{background:var(--sage-dark)}.toggle.on i{transform:translate(18px)}.account-section{display:grid;grid-template-columns:35px 1fr auto;align-items:center;gap:10px;background:#f1f5ee}.account-section>svg{color:var(--sage-dark)}.account-section h2{margin:0 0 4px}.account-section p{margin:0;font-size:.72rem}.account-profile{display:grid;grid-template-columns:42px 1fr;align-items:center;gap:14px;background:#f1f5ee}.account-profile>svg{color:var(--sage-dark)}.account-profile h2,.account-profile p{margin:0}.account-profile p{font-size:.74rem}.account-actions{display:flex;align-items:center;justify-content:space-between;gap:18px}.auth-panel{max-width:520px}.auth-tabs{display:grid;grid-template-columns:repeat(2,1fr);margin-bottom:28px;border-bottom:1px solid var(--line)}.auth-tabs button{padding:12px;border:0;border-bottom:2px solid transparent;background:transparent;color:var(--muted);cursor:pointer}.auth-tabs button.active{border-bottom-color:var(--ink);color:var(--ink);font-weight:700}.auth-panel form{display:flex;flex-direction:column;gap:18px}.auth-panel label{display:flex;flex-direction:column;gap:7px;color:var(--ink);font-size:.75rem;font-weight:700}.auth-panel input{width:100%;min-height:46px;padding:0 12px;border:1px solid var(--line);border-radius:4px;background:#fff;color:var(--ink);font:inherit}.auth-panel input:focus{border-color:var(--sage-dark);outline:3px solid rgba(71,114,90,.12)}.auth-panel small{color:var(--muted);font-weight:400}.password-panel{max-width:none}.password-panel form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:end}.password-panel form .button{justify-self:start}.danger-zone{border-color:#e0b7af}.danger-zone h2{color:var(--coral)}.danger-zone label{max-width:360px;display:flex;flex-direction:column;gap:7px;margin:16px 0;font-size:.72rem;font-weight:700}.danger-zone input{min-height:43px;padding:0 11px;border:1px solid var(--line);border-radius:4px}@keyframes rise{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}@keyframes reveal{0%{opacity:0;transform:scale(.97)}to{opacity:1;transform:scale(1)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-7px)}}@keyframes pulse{50%{transform:scale(.92);opacity:.65}}@media(max-width:1000px){.welcome-hero{padding-inline:40px;gap:25px}.welcome-visual{min-height:500px}.welcome-visual .sun-disc{width:330px;height:330px}.app-shell{grid-template-columns:190px 1fr}.page{width:min(100% - 40px,1080px)}.puzzle-layout{grid-template-columns:minmax(470px,620px) 290px;gap:20px}.lesson-stage{grid-template-columns:1fr 250px}.review-grid{grid-template-columns:1fr 280px}}@media(min-width:781px)and (max-height:850px){.puzzle-header{height:58px}.puzzle-layout{padding:10px 0}.board-workspace{--puzzle-board-size: min(100%, max(432px, calc(100dvh - 184px) ))}.board-tools{margin-top:8px}.number-pad{margin-top:7px;gap:4px}.number-pad button{min-height:44px}}@media(max-width:780px){.mobile-only{display:grid!important}.public-header{height:68px;padding:0 20px}.welcome-page{background:radial-gradient(circle at 50% 28%,rgba(220,232,215,.7),transparent 24%),var(--ivory)}.welcome-hero{min-height:auto;padding:30px 24px 45px;grid-template-columns:1fr;text-align:center;gap:10px}.welcome-copy{display:flex;flex-direction:column;align-items:center}.welcome-copy h1{font-size:clamp(2.8rem,13vw,4.1rem)}.welcome-copy>p{font-size:.96rem}.welcome-visual{grid-row:1;min-height:290px}.welcome-visual .sun-disc{width:260px;height:260px}.welcome-visual .mascot{width:270px;height:290px}.coach-quote{right:5%;bottom:8%;font-size:.78rem}.welcome-proof{flex-direction:column;align-items:center;gap:6px}.welcome-features{padding:22px 24px;grid-template-columns:1fr;gap:16px}.welcome-features>div{padding:0;border:0}.welcome-learning{width:calc(100% - 48px);margin-top:20px;padding:44px 0 30px;grid-template-columns:1fr;gap:36px}.welcome-learning-intro h2{font-size:clamp(2.15rem,10vw,3.2rem)}.level-options{grid-template-columns:1fr}.level-options button{min-height:115px}.level-options strong{margin-top:15px}.app-shell{display:block}.sidebar{position:fixed;left:0;width:250px;transform:translate(-105%);transition:transform .25s var(--ease-drawer);box-shadow:var(--shadow)}.sidebar.sidebar-open{transform:translate(0)}.scrim{display:block;position:fixed;top:0;right:0;bottom:0;left:0;z-index:20;border:0;background:#102a434d;opacity:0;pointer-events:none;transition:opacity .15s var(--ease-out-ui)}.scrim[data-open]{opacity:1;pointer-events:auto;transition-duration:.18s}.mobile-header{height:58px;padding:0 12px;position:sticky;top:0;z-index:15;display:grid;grid-template-columns:45px 36px minmax(0,1fr) auto;align-items:center;border-bottom:1px solid var(--line);background:#f7f3eaf2;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.header-title{min-width:0;overflow:hidden;font-family:var(--serif);font-size:.9rem;text-overflow:ellipsis;white-space:nowrap}.page{width:min(100% - 28px,680px);padding:35px 0 60px}.page-heading{align-items:flex-start;flex-direction:column;margin-bottom:26px}.page-heading h1{font-size:2.8rem}.home-primary{grid-template-columns:1fr}.today-body{grid-template-columns:170px 1fr}.progress-panel{display:grid;grid-template-columns:1fr 130px}.progress-panel>.eyebrow{grid-column:1 / -1}.progress-ring{width:120px;height:120px;grid-column:2;grid-row:2}.progress-stats{grid-column:1;grid-row:2}.path-line{grid-template-columns:1fr;gap:16px}.path-line:before{width:1px;height:auto;top:12px;bottom:12px;left:16px;right:auto}.path-step{min-height:42px;display:grid;grid-template-columns:36px 1fr;grid-template-rows:1fr 1fr;text-align:left}.path-step i{grid-row:1 / 3}.path-step strong,.path-step span{margin:0}.continue-lesson{grid-template-columns:105px 1fr}.mastery{display:none}.puzzle-header{padding:0 14px;grid-template-columns:1fr auto}.puzzle-header>.icon-button{display:none}.mistake-count{display:none}.puzzle-layout{width:min(100% - 20px,620px);padding:18px 0 40px;display:flex;flex-direction:column}.puzzle-goal,.exploration-banner{width:100%}.coach-status{display:none}.practice-layout{grid-template-columns:1fr;gap:22px}.notebook-callout{grid-template-columns:auto 1fr}.notebook-callout .button{grid-column:1 / -1}.board-wrap{width:100%}.coach-panel.coach-chat{position:static;width:100%;height:auto;min-height:510px}.guided-practice-complete{position:static;width:100%;min-height:0}.coach-thread-shell{min-height:300px;max-height:430px;flex-basis:430px}.lesson-list{border-top-color:var(--line)}.lesson-row{grid-template-columns:42px 1fr 24px}.lesson-row-meta>span{display:none}.advanced-preview{align-items:flex-start;flex-direction:column}.lesson-layout{grid-template-columns:1fr;gap:18px}.lesson-steps{position:static;display:grid;grid-template-columns:repeat(4,1fr)}.lesson-steps>.eyebrow,.lesson-outcome{display:none}.lesson-steps>button{justify-content:center;flex-direction:column;gap:5px}.lesson-content{padding:26px;min-height:590px}.lesson-content>h1{font-size:2.6rem}.lesson-stage,.worked-example,.try-stage{grid-template-columns:1fr}.lesson-illustration{max-height:250px;order:-1}.review-heading{min-height:250px;padding:25px}.review-heading .mascot{width:120px;height:145px}.review-summary{grid-template-columns:repeat(2,1fr);gap:14px}.review-summary>div:not(.progress-ring){border-left:0;padding-left:0}.review-summary .progress-ring{grid-column:1 / -1;justify-self:center}.review-grid{grid-template-columns:1fr}.review-next{align-items:flex-start;flex-direction:column}.pricing-grid{grid-template-columns:1fr}.checkout-trust{align-items:center;flex-direction:column;gap:9px}}@media(max-width:520px){.public-header .text-link{font-size:.72rem}.password-panel form{grid-template-columns:1fr}.hero-actions{width:100%;flex-direction:column}.hero-actions .button{width:100%}.onboarding-main{padding-top:30px}.onboarding-coach{align-items:flex-start}.today-body{grid-template-columns:1fr}.today-body .mini-board{width:185px}.today-panel,.learning-path{padding:20px}.continue-lesson{padding:18px;grid-template-columns:75px 1fr;gap:15px}.continue-lesson .button{width:100%;padding-inline:10px}.puzzle-header{height:58px}.puzzle-header>.text-link{font-size:.7rem}.puzzle-meta{gap:8px}.coach-chat-header{min-height:74px;padding:10px 12px}.segmented-control{width:100%}.segmented-control button{padding-inline:6px}.practice-prompt,.notebook-gate{padding:22px 18px}.cell-value{font-size:1.45rem}.sudoku-cell.hinted:after{top:3px;right:3px;bottom:3px;left:3px}.number-pad{grid-template-columns:repeat(10,1fr);gap:3px}.number-pad button{grid-column:span 2;min-height:52px;aspect-ratio:auto;padding:0;font-size:1rem}.number-pad button:nth-child(6){grid-column:2 / span 2}.board-tools{margin-top:12px;display:flex;flex-direction:column}.board-tools .puzzle-number-pad{order:-1;margin-top:0;grid-template-columns:repeat(5,minmax(0,1fr))}.board-tools .puzzle-number-pad button,.board-tools .puzzle-number-pad button:nth-child(6){grid-column:auto}.board-tools .mobile-input-mode{display:flex;gap:2px;border-color:#afbec9;background:#f1f5f7;color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,sans-serif}.board-tools .mobile-input-mode.active{border-color:#2d6793;background:var(--blue-wash);box-shadow:inset 0 0 0 1px #2d6793}.board-tools .mobile-input-mode small{max-width:100%;margin:0;color:inherit;font-size:.54rem;font-weight:750;line-height:1.1;text-wrap:balance}.board-tools .mobile-input-mode .notes-symbol{font-size:.92rem;line-height:1}.edit-tools{margin-top:8px}.edit-tools .desktop-note-tool-wrap{display:none}.edit-tools button{min-width:0;width:100%;flex:1;flex-direction:column}.edit-tools .tool-button-wrap{min-width:0;flex:1}.edit-tools .tool-button-wrap:first-child .tool-tooltip{left:0;transform:translateY(4px)}.edit-tools .tool-button-wrap:first-child:hover .tool-tooltip,.edit-tools .tool-button-wrap:first-child:focus-within .tool-tooltip,.edit-tools .tool-button-wrap:first-child:focus-visible .tool-tooltip{transform:translateY(0)}.edit-tools .tool-button-wrap:first-child .tool-tooltip:after{left:28px}.edit-tools .tool-button-wrap:last-child .tool-tooltip,.edit-tools .explore-tool-wrap .tool-tooltip{right:0;left:auto;transform:translateY(4px)}.edit-tools .tool-button-wrap:last-child:hover .tool-tooltip,.edit-tools .tool-button-wrap:last-child:focus-within .tool-tooltip,.edit-tools .tool-button-wrap:last-child:focus-visible .tool-tooltip,.edit-tools .explore-tool-wrap:hover .tool-tooltip,.edit-tools .explore-tool-wrap:focus-within .tool-tooltip,.edit-tools .explore-tool-wrap:focus-visible .tool-tooltip{transform:translateY(0)}.edit-tools .tool-button-wrap:last-child .tool-tooltip:after,.edit-tools .explore-tool-wrap .tool-tooltip:after{right:28px;left:auto;transform:none}.lesson-row{padding-inline:5px}.lesson-content{padding:22px 18px}.lesson-steps>button span{font-size:.6rem}.review-heading{align-items:flex-start;padding-bottom:0}.review-heading .mascot{align-self:flex-end;width:95px}.review-heading p{font-size:.75rem}.review-next>div:last-child,.lesson-complete>div{width:100%;flex-direction:column}.price-plan{padding:30px 24px}.account-section{grid-template-columns:30px 1fr}.account-section .button{grid-column:1 / -1}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-property:color,background-color,border-color,opacity!important;transition-duration:.12s!important}}.public-header-actions{display:flex;align-items:center;gap:1rem}.language-picker{display:flex;align-items:center;justify-content:space-between;gap:.75rem;color:var(--ink, #17324d);font-size:.76rem;font-weight:650}.sidebar>.language-picker{margin-top:10px;padding:2px 4px}.language-picker-label{display:inline-flex;align-items:center;gap:.45rem;color:var(--muted);letter-spacing:.01em}.language-picker.compact .language-picker-label{color:var(--ink-soft)}.language-toggle{position:relative;isolation:isolate;display:grid;grid-template-columns:repeat(2,1fr);width:94px;padding:3px;border:1px solid rgba(16,42,67,.14);border-radius:999px;background:#fffdf8b8;box-shadow:inset 0 1px 2px #102a430a,0 1px #fffc}.language-toggle:before{content:"";position:absolute;z-index:-1;top:3px;bottom:3px;left:3px;width:calc(50% - 3px);border-radius:inherit;background:var(--ink);box-shadow:0 2px 7px #102a432e;transition:transform .18s cubic-bezier(.22,1,.36,1),background-color .18s ease}.language-toggle[data-locale=fr]:before{transform:translate(100%)}.language-toggle button{min-width:0;min-height:30px;padding:0 9px;border:0;border-radius:999px;background:transparent;color:var(--muted);font-size:.7rem;font-weight:750;letter-spacing:.08em;cursor:pointer;transition:color .15s ease,transform .15s var(--ease-out-ui)}.language-toggle button:active{transform:scale(.97)}.language-toggle button.active{color:var(--paper)}.language-toggle button:focus-visible{outline:2px solid var(--saffron);outline-offset:1px}.language-picker.compact{gap:.5rem}.mobile-header>.language-picker.compact{min-width:0;justify-self:end}.language-picker.compact .language-toggle{width:86px}.language-picker.compact .language-toggle button{min-height:28px;padding-inline:7px}@media(hover:hover)and (pointer:fine){.language-toggle button:hover:not(.active){color:var(--ink)}}@media(max-width:640px){.public-header-actions .text-link{display:none}.language-picker.compact{gap:.35rem}.language-picker.compact .language-toggle button{min-height:36px}}