:root{--c-bg: #f3f8fc;--c-surface: #ffffff;--c-surface-sunk: #eaf3fa;--c-line: #d7e6ef;--c-line-strong: #acc8da;--c-ink: #102536;--c-ink-soft: #496173;--c-ink-faint: #6b8495;--c-accent: #056fc6;--c-accent-strong: #07579a;--c-accent-ink: #ffffff;--c-accent-wash: #e3f4ff;--c-lime: #d2f640;--c-lime-ink: #182400;--c-good: #146c43;--c-good-wash: #e4f2ea;--c-bad: #a4262c;--c-bad-wash: #fbe9e9;--c-warn: #8a5a00;--c-warn-wash: #fbf0dc;--font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono: ui-monospace, "Cascadia Mono", "Roboto Mono", Menlo, Consolas, monospace;--t-xs: .8125rem;--t-sm: .9375rem;--t-base: 1rem;--t-body: 1.0625rem;--t-lg: 1.25rem;--t-xl: 1.5rem;--t-2xl: 1.875rem;--t-3xl: 2.25rem;--leading-tight: 1.2;--leading-body: 1.55;--s-1: .25rem;--s-2: .5rem;--s-3: .75rem;--s-4: 1rem;--s-5: 1.5rem;--s-6: 2rem;--s-7: 3rem;--r-sm: 8px;--r-md: 14px;--r-lg: 24px;--r-pill: 999px;--shadow-1: 0 1px 2px rgb(11 84 129 / .05), 0 8px 20px rgb(11 84 129 / .08);--shadow-2: 0 12px 40px rgb(11 84 129 / .16);--w-content: 46rem;--w-wide: 72rem;--tap: 48px;--ease: cubic-bezier(.2, 0, .13, 1);--dur-fast: .12s;--dur: .2s}@media(prefers-reduced-motion:reduce){:root{--dur-fast: 0ms;--dur: 0ms}}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body,h1,h2,h3,p,ol,ul,figure{margin:0}ol,ul{padding:0;list-style:none}img,svg,canvas{display:block;max-width:100%}button,input,select,textarea{font:inherit;color:inherit}body{background:var(--c-bg);color:var(--c-ink);font-family:var(--font-sans);font-size:var(--t-base);line-height:var(--leading-body);padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}:focus-visible{outline:3px solid var(--c-accent);outline-offset:2px;border-radius:var(--r-sm)}code{font-family:var(--font-mono);font-size:.95em}.app{min-height:100dvh;display:flex;flex-direction:column}.app__bar{display:flex;align-items:baseline;gap:var(--s-3);padding:var(--s-4);border-bottom:1px solid var(--c-line);background:var(--c-surface)}.app__mark{font-size:var(--t-lg);font-weight:700;letter-spacing:.12em}.app__tag{color:var(--c-ink-faint);font-size:var(--t-sm)}.app__main{flex:1;width:100%;max-width:var(--w-content);margin-inline:auto;padding:var(--s-5) var(--s-4) var(--s-7);display:flex;flex-direction:column;gap:var(--s-5)}.app__foot{padding:var(--s-4);border-top:1px solid var(--c-line);color:var(--c-ink-faint);font-size:var(--t-xs);text-align:center}.panel{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-lg);box-shadow:var(--shadow-1);overflow:hidden}.panel__head{display:flex;align-items:center;justify-content:space-between;gap:var(--s-3);padding:var(--s-4);border-bottom:1px solid var(--c-line)}.panel__title{font-size:var(--t-lg);line-height:var(--leading-tight)}.panel__body{padding:var(--s-4);display:flex;flex-direction:column;gap:var(--s-3)}.panel__body p{color:var(--c-ink-soft)}.curriculum-path{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--s-3)}.field{display:flex;flex-direction:column;gap:var(--s-1)}.field--wide{grid-column:1 / -1}.field__label{color:var(--c-ink-soft);font-size:var(--t-sm);font-weight:700}.field select{min-height:var(--tap);width:100%;padding:var(--s-2) var(--s-3);border:1px solid var(--c-line-strong);border-radius:var(--r-md);background:var(--c-surface)}.curriculum-selection{padding:var(--s-4);border:1px solid var(--c-line);border-radius:var(--r-md);background:var(--c-surface-sunk)}.curriculum-selection__path{margin-bottom:var(--s-2);color:var(--c-ink-soft);font-size:var(--t-sm);font-weight:700}.curriculum-selection__path span{padding-inline:var(--s-1)}.curriculum-selection h2{font-size:var(--t-xl);line-height:var(--leading-tight)}.curriculum-selection h2+p{margin-top:var(--s-2)}.curriculum-selection__action{display:flex;flex-wrap:wrap;align-items:center;gap:var(--s-3);margin-top:var(--s-4)}.btn{min-height:var(--tap);padding:var(--s-2) var(--s-5);border-radius:var(--r-pill);border:1px solid transparent;font-weight:600;cursor:pointer;transition:background var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn--solid{background:var(--c-accent);color:var(--c-accent-ink)}.btn--solid:hover:not(:disabled){background:var(--c-accent-strong)}.btn--quiet{background:transparent;border-color:var(--c-line-strong);color:var(--c-ink)}.btn--quiet:hover:not(:disabled){background:var(--c-surface-sunk)}.chip{display:inline-flex;align-items:center;gap:var(--s-2);padding:var(--s-1) var(--s-3);border:1px solid var(--c-line-strong);border-radius:var(--r-pill);background:var(--c-surface-sunk);font-size:var(--t-xs)}.chip__label{color:var(--c-ink-soft)}.chip__code{font-weight:700;letter-spacing:.02em}.virtual-lab{display:flex;flex-direction:column;gap:var(--s-5)}.virtual-lab__head{display:flex;flex-direction:column;gap:var(--s-4)}.virtual-lab__meta{display:flex;align-items:center;justify-content:space-between;gap:var(--s-3)}.virtual-lab__meta .btn{min-height:2.75rem;padding-inline:var(--s-4);font-size:var(--t-sm)}.btn--back span{margin-right:.15rem}.virtual-lab__title{display:flex;flex-direction:column;align-items:flex-start;gap:var(--s-2)}.lab-zone__eyebrow{color:var(--c-accent-strong);font-size:var(--t-xs);font-weight:800;letter-spacing:.1em;text-transform:uppercase}.virtual-lab h1{font-size:clamp(1.75rem,1.2rem + 2.4vw,2.75rem);letter-spacing:-.03em;line-height:1.08}.virtual-lab__intro{max-width:44rem;color:var(--c-ink-soft);font-size:var(--t-body)}.virtual-lab__alignment{color:var(--c-ink-faint);font-size:var(--t-sm)}.lab-zone{display:flex;flex-direction:column;gap:var(--s-3)}.lab-zone>header{padding-inline:var(--s-1)}.lab-zone__eyebrow{margin-top:0}.lab-zone h2{margin-top:var(--s-1);font-size:var(--t-xl);line-height:var(--leading-tight)}.lab-zone>header>p:last-child{max-width:46rem;margin-top:var(--s-1);color:var(--c-ink-soft)}.lab-zone__content{display:flex;flex-direction:column;gap:var(--s-3)}.lab-zone--orientation .treatment{max-width:48rem}.lab-zone--observation{padding:var(--s-4);border:1px solid var(--c-line);border-radius:var(--r-lg);background:var(--c-surface-sunk)}.teacher-panel{display:grid;grid-template-columns:minmax(12rem,.9fr) minmax(15rem,1.1fr) minmax(12rem,.8fr);align-items:center;gap:var(--s-4);padding:var(--s-4);border:1px solid var(--c-accent);border-radius:var(--r-lg);background:linear-gradient(110deg,var(--c-accent-wash),var(--c-surface))}.teacher-panel__eyebrow{color:var(--c-ink-soft);font-size:var(--t-xs);font-weight:800;letter-spacing:.08em;text-transform:uppercase}.teacher-panel h2{margin-top:var(--s-1);font-size:var(--t-lg)}.teacher-panel>p{color:var(--c-ink-soft)}.teacher-panel>span{padding:var(--s-2) var(--s-3);border-left:2px solid var(--c-accent);color:var(--c-ink-soft);font-size:var(--t-sm)}.treatment{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-lg);padding:var(--s-4)}.treatment--placeholder{border-style:dashed;color:var(--c-ink-faint)}.treatment__missing code{color:var(--c-ink);font-weight:700}.treatment__hint{margin-top:var(--s-2);font-size:var(--t-sm)}.treatment h3{font-size:var(--t-lg);line-height:var(--leading-tight)}.treatment--explainer p{margin-top:var(--s-2);color:var(--c-ink-soft)}.station{--stage-h: clamp(20rem, 60vh, 34rem);display:grid;grid-template-columns:minmax(0,1fr);overflow:hidden;border:1px solid var(--c-line);border-radius:var(--r-lg);background:var(--c-surface);box-shadow:var(--shadow-1)}@supports (height: 1svh){.station{--stage-h: clamp(20rem, 60svh, 34rem)}}.station__stage{position:relative;isolation:isolate;height:var(--stage-h);overflow:hidden;container-type:size;background:radial-gradient(70% 55% at 50% 38%,rgb(255 255 255 / .95),transparent 70%),linear-gradient(180deg,#f4f9fd,#e2eef7 72%,#d5e6f1)}.station__canvas{position:absolute;inset:0;touch-action:none;cursor:grab}.station__canvas:active{cursor:grabbing}.station__canvas canvas{width:100%;height:100%;outline:none}.callouts{position:absolute;inset:0;z-index:1;pointer-events:none}.callouts__lines{position:absolute;inset:0;width:100%;height:100%;overflow:visible}.callouts__lines polyline{fill:none;stroke:var(--c-ink);stroke-width:1.25;opacity:.55}.callouts__lines circle{fill:var(--c-surface);stroke:var(--c-ink);stroke-width:1.5}.callouts__lines g[data-active=true] polyline{stroke:var(--c-accent);stroke-width:2;opacity:1}.callouts__lines g[data-active=true] circle{fill:var(--c-accent);stroke:#fff;stroke-width:2}.callouts__lines [data-behind=true]{opacity:.25}.callout{position:absolute;top:0;left:0;min-height:2rem;padding:.3rem .75rem;border:1px solid rgb(16 37 54 / .12);border-radius:var(--r-pill);background:#fffffff0;box-shadow:0 4px 14px #1025361f;color:var(--c-ink);cursor:pointer;font-size:var(--t-sm);font-weight:700;white-space:nowrap;opacity:0;pointer-events:auto;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);will-change:transform}.callout[data-placed=true]{opacity:1;transition:opacity var(--dur) var(--ease)}.callout[data-behind=true]{opacity:.55}.callout[aria-pressed=true]{border-color:var(--c-accent);background:var(--c-accent);color:#fff}.station__status{position:absolute;inset:0;z-index:3;display:flex;align-items:center;justify-content:center;gap:var(--s-3);padding:var(--s-5);color:var(--c-ink-soft);font-weight:700;text-align:center}.spinner{width:1.4rem;height:1.4rem;flex:none;border:3px solid var(--c-line-strong);border-top-color:var(--c-accent);border-radius:50%;animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.station__hint{position:absolute;top:var(--s-3);left:50%;z-index:2;max-width:calc(100% - 2rem);padding:.35rem .8rem;transform:translate(-50%);border-radius:var(--r-pill);background:#102536c7;color:#fff;font-size:var(--t-xs);font-weight:700;text-align:center;white-space:nowrap;pointer-events:none}.station__tools{position:absolute;right:var(--s-3);bottom:var(--s-3);left:var(--s-3);z-index:2;display:flex;justify-content:flex-end;gap:var(--s-2);pointer-events:none}.tool{display:inline-flex;flex:none;align-items:center;justify-content:center;gap:var(--s-2);min-width:2.75rem;height:2.75rem;padding:0 .6rem;border:1px solid var(--c-line-strong);border-radius:.85rem;background:#ffffffeb;box-shadow:0 2px 10px #1025361f;color:var(--c-ink);cursor:pointer;font-size:var(--t-sm);font-weight:700;pointer-events:auto;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);transition:background var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease)}.tool:hover:not(:disabled){border-color:var(--c-accent)}.tool:disabled{opacity:.5;cursor:not-allowed}.tool[aria-pressed=true]{border-color:var(--c-accent);background:var(--c-accent-wash);color:var(--c-accent-strong)}.tool--primary{padding-inline:.9rem;border-color:var(--c-accent);background:var(--c-accent);color:#fff}.tool--primary:hover:not(:disabled){background:var(--c-accent-strong)}.tool--wide{flex:1}.optical{position:absolute;inset:0;z-index:5;display:grid;grid-template-rows:auto minmax(0,1fr) auto;gap:var(--s-2);padding:var(--s-3);background:radial-gradient(circle at 50% 45%,#26333b,#0e151a 65%,#05080a);color:#f3f8fa;animation:optical-in .26s var(--ease)}@keyframes optical-in{0%{opacity:0}}.optical__head{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--s-3)}.optical__head span{display:block;color:#9fb6bf;font-size:var(--t-xs);font-weight:800;letter-spacing:.08em;text-transform:uppercase}.optical__head strong{display:block;font-size:var(--t-base)}.optical__well{display:grid;place-items:center;min-height:0;container-type:size}.optical__field{width:min(100%,16rem);width:min(100cqw,100cqh,40rem);aspect-ratio:1;overflow:hidden;border:.5rem solid #070b0e;border-radius:50%;background:#05090b;box-shadow:0 0 0 2px #5f7f86,0 0 3rem #0009}.optical__field img{width:100%;height:100%;object-fit:cover;-webkit-user-select:none;user-select:none;transition:transform .26s var(--ease),filter .12s linear}.optical__controls{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:var(--s-2) var(--s-4)}.segmented{display:inline-flex;overflow:hidden;border:1px solid #5f7f86;border-radius:.85rem}.segmented button{min-width:3.25rem;min-height:2.75rem;border:0;background:#ffffff14;color:#e6f0f2;cursor:pointer;font-weight:800}.segmented button+button{border-left:1px solid #5f7f86}.segmented button[aria-pressed=true]{background:#6ed1c6;color:#072326}.optical__focus{display:inline-flex;flex:1 1 7rem;align-items:center;gap:var(--s-2);max-width:18rem;min-height:2.75rem;font-size:var(--t-sm);font-weight:700}.optical__focus input{flex:1;min-width:0;height:2.75rem;accent-color:#6ed1c6}.optical__controls p{width:100%;color:#b9cbd0;font-size:var(--t-sm);text-align:center}.optical__controls strong{color:#fff}.optical__controls .optical__nudge{margin-top:calc(var(--s-2) * -1);color:#8fe3d9}.station__panel{display:flex;flex-direction:column;min-width:0;border-top:1px solid var(--c-line)}.parts{display:flex;gap:var(--s-2);overflow-x:auto;padding:var(--s-3);scroll-snap-type:x proximity;scrollbar-width:none}.parts::-webkit-scrollbar{display:none}.parts li{flex:none;scroll-snap-align:start}.parts button{display:flex;align-items:center;gap:var(--s-2);width:100%;min-height:2.75rem;padding:0 .85rem 0 .4rem;border:1px solid var(--c-line);border-radius:var(--r-pill);background:var(--c-surface);color:var(--c-ink);cursor:pointer;font-size:var(--t-sm);font-weight:700;text-align:left;white-space:nowrap}.parts button:hover{border-color:var(--c-line-strong)}.parts__num{display:grid;flex:none;place-items:center;width:1.75rem;height:1.75rem;border-radius:50%;background:var(--c-surface-sunk);color:var(--c-accent-strong);font-size:var(--t-xs);font-weight:800}.parts button[aria-pressed=true]{border-color:var(--c-accent);background:var(--c-accent-wash)}.parts button[aria-pressed=true] .parts__num{background:var(--c-accent);color:#fff}.part-card{display:flex;flex-direction:column;gap:var(--s-2);padding:var(--s-2) var(--s-4) var(--s-4)}.part-card__count{color:var(--c-ink-faint);font-size:var(--t-xs);font-weight:800;letter-spacing:.08em;text-transform:uppercase}.part-card h3{font-size:var(--t-xl);letter-spacing:-.02em;line-height:var(--leading-tight)}.part-card>p:not([class]){color:var(--c-ink-soft);font-size:var(--t-body)}.part-card__care{padding:var(--s-3);border-left:3px solid var(--c-warn);border-radius:var(--r-sm);background:var(--c-warn-wash);color:var(--c-ink);font-size:var(--t-sm)}.part-card__care strong{display:block;color:var(--c-warn);font-size:var(--t-xs);letter-spacing:.06em;text-transform:uppercase}.part-card__nav{display:flex;align-items:center;justify-content:space-between;gap:var(--s-2);margin-top:var(--s-2)}.part-card__nav .tool:not(.tool--primary){box-shadow:none}.part-card__dots{display:flex;flex-wrap:wrap;justify-content:center;gap:.35rem}.part-card__dots i{width:.45rem;height:.45rem;border-radius:50%;background:var(--c-line-strong)}.part-card__dots i[data-on=true]{width:1.1rem;border-radius:var(--r-pill);background:var(--c-accent)}body.is-locked{overflow:hidden}.station:fullscreen,.station--immersive{position:fixed;inset:0;z-index:100;grid-template-rows:minmax(0,1fr) auto;width:100%;height:100%;border:0;border-radius:0;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}.station:fullscreen .station__stage,.station--immersive .station__stage{height:100%}.station:fullscreen .part-card>p:not([class]),.station--immersive .part-card>p:not([class]){font-size:var(--t-base)}.station:fullscreen .part-card__care,.station--immersive .part-card__care{display:none}@media(min-width:56rem){.station{--stage-h: clamp(28rem, 72vh, 46rem);grid-template-columns:minmax(0,1fr) clamp(18rem,26vw,24rem)}.station__panel{border-top:0;border-left:1px solid var(--c-line);max-height:var(--stage-h)}.parts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-content:start;flex:1;gap:.2rem;overflow-x:visible;overflow-y:auto;padding:var(--s-3)}.parts button{padding-right:.4rem;border-color:transparent;border-radius:var(--r-md);background:transparent;white-space:normal;line-height:1.15}.parts button:hover{background:var(--c-surface-sunk)}.part-card{padding:var(--s-4);border-top:1px solid var(--c-line);background:var(--c-surface-sunk)}.station:fullscreen,.station--immersive{grid-template-rows:1fr}.station:fullscreen .station__panel,.station--immersive .station__panel{max-height:none}.station:fullscreen .part-card__care,.station--immersive .part-card__care{display:block}}@media(orientation:landscape)and (max-height:32rem){.station{--stage-h: calc(100vh - 6rem) ;grid-template-columns:minmax(0,1fr) 16rem}@supports (height: 1svh){.station{--stage-h: calc(100svh - 6rem) }}.station__panel{max-height:var(--stage-h);overflow-y:auto;border-top:0;border-left:1px solid var(--c-line)}.parts{flex-wrap:wrap;overflow:visible}.parts button{min-height:2.5rem}.part-card__care{display:none}.station:fullscreen,.station--immersive{grid-template-rows:1fr}.station:fullscreen .station__panel,.station--immersive .station__panel{max-height:100%}}@media(max-width:30rem){.tool--primary span{display:none}.station__tools .tool--primary{padding-inline:.6rem}.part-card__nav .tool--primary span{display:inline}}@media(prefers-reduced-motion:reduce){.spinner{animation-duration:3s}.optical{animation:none}.optical__field img{transition:none}}.stack{display:flex;flex-direction:column;gap:var(--s-3)}.muted{color:var(--c-ink-soft)}.empty{color:var(--c-ink-faint)}@media(min-width:60rem){.app__main{max-width:var(--w-wide)}}@media(min-width:42rem){.curriculum-path{grid-template-columns:repeat(4,minmax(0,1fr))}.field--wide{grid-column:span 2}}@media(max-width:48rem){.teacher-panel{grid-template-columns:1fr}.teacher-panel>span{border-top:2px solid var(--c-accent);border-left:0}}.app__bar{position:sticky;top:0;z-index:20;justify-content:space-between;min-height:4.5rem;padding-inline:clamp(1rem,4vw,4rem);background:#fffffff0;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.app__brand,.app__nav button{border:0;background:transparent;cursor:pointer}.app__brand{display:inline-flex;align-items:baseline;gap:var(--s-3);padding:0;color:var(--c-ink);text-align:left}.app__mark{font-size:1.05rem;letter-spacing:.18em}.app__tag{font-size:var(--t-xs);font-weight:700}.app__nav button{min-height:2.75rem;padding-inline:var(--s-2);color:var(--c-ink-soft);font-size:var(--t-sm);font-weight:750}.app__nav button:hover{color:var(--c-accent-strong)}.app__main--home{max-width:86rem;gap:clamp(2.5rem,7vw,6rem);padding:clamp(1rem,3vw,2.5rem) clamp(1rem,4vw,4rem) clamp(3rem,8vw,7rem)}.app__main--lab{max-width:var(--w-wide)}.home-hero{position:relative;min-height:42rem;overflow:hidden;border-radius:clamp(1.5rem,3vw,2.5rem);background-color:#078de2;background-image:url(/images/praxis-lab-sky-v1.png);background-position:center;background-size:cover;box-shadow:var(--shadow-2)}.home-hero__copy{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;max-width:50rem;margin-inline:auto;padding:clamp(2.8rem,5vw,4.8rem) clamp(1.25rem,4vw,3rem) 1rem;color:#fff;text-align:center}.home-hero__eyebrow,.section-heading>p,.curriculum-finder__intro>p{color:inherit;font-size:var(--t-xs);font-weight:800;letter-spacing:.12em;text-transform:uppercase}.home-hero h1{max-width:15ch;margin-top:var(--s-4);font-size:clamp(2.45rem,5vw,4.6rem);letter-spacing:-.065em;line-height:.98}.home-hero h1 em{color:var(--c-lime);font-style:normal}.home-hero__intro{max-width:39rem;margin-top:var(--s-4);color:#fffffff0;font-size:clamp(1rem,1.5vw,1.15rem)}.home-hero__actions{display:flex;flex-wrap:wrap;gap:var(--s-3);justify-content:center;margin-top:var(--s-4)}.home-hero .btn--solid{border-color:var(--c-lime);background:var(--c-lime);color:var(--c-lime-ink)}.home-hero .btn--solid:hover:not(:disabled){background:#e3ff79}.home-hero .btn--quiet{border-color:#fffc;background:#ffffff1f;color:#fff}.home-hero__note{margin-top:var(--s-4);color:#ffffffd6;font-size:var(--t-sm);font-weight:650}.lab-carousel{position:absolute;right:0;bottom:2rem;left:0;z-index:3;display:flex;justify-content:center;align-items:center;gap:clamp(.5rem,1.3vw,1.25rem);padding-inline:1rem;perspective:85rem}.image-card{position:relative;flex:0 1 12.2rem;height:clamp(8rem,13vw,10.2rem);overflow:hidden;border:2px solid rgb(255 255 255 / .9);border-radius:.75rem;box-shadow:0 1rem 2.2rem 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2.4vw,2.75rem);font-weight:500;letter-spacing:-.05em}@media(min-width:52rem){.facts{grid-template-columns:1fr 1fr 1fr}.fact--photo,.fact--grey{min-height:24rem}}@media(max-width:52rem){.sky-nav{grid-template-columns:1fr auto}.sky-nav__links,.sky-nav__signin{display:none}}@media(max-width:34rem){.arc{gap:.35rem}.arc-card{width:5.6rem;height:5.4rem;font-size:.55rem}.arc-card--edge{display:none}.sky-hero__actions .pill{padding-inline:1rem}}@media(prefers-reduced-motion:reduce){.arc-card,.marquee__track{animation:none}}.app--auth{min-height:100dvh;background:#fff}.auth{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s-4);min-height:100dvh;padding:clamp(.5rem,1.2vw,.9rem)}.auth__sky{display:flex;flex-direction:column;align-items:flex-start;gap:var(--s-4);padding:clamp(1.25rem,4vw,3rem);border-radius:clamp(1.25rem,2.5vw,1.75rem);background:linear-gradient(180deg,#0a6edc99,#1482e633),#1a8fe6 var(--sky) center / cover;color:#fff}.auth__back{min-height:2.75rem;padding:0 1rem;border:1px solid rgb(255 255 255 / .3);border-radius:var(--r-pill);background:#0d2a4a66;color:#fff;cursor:pointer;font-family:var(--font-ui-mono);font-size:.75rem;letter-spacing:.1em;text-transform:uppercase}.auth__sky h1{margin-top:auto;font-size:clamp(2.2rem,1.3rem + 3.5vw,4rem);font-weight:500;letter-spacing:-.06em;line-height:1}.auth__sky h1 span{color:#e2f0ffd1}.auth__sky>p{max-width:28rem;color:#ffffffe6}.auth__card{display:flex;flex-direction:column;gap:var(--s-4);width:100%;max-width:28rem;margin:0 auto;padding:clamp(1.25rem,4vw,2.5rem) clamp(.5rem,3vw,1.5rem);align-self:center}.auth__tabs{display:grid;grid-template-columns:1fr 1fr;padding:.25rem;border-radius:var(--r-pill);background:#f0f2f4}.auth__tabs button{min-height:2.75rem;border:0;border-radius:var(--r-pill);background:none;color:var(--c-ink-soft);cursor:pointer;font-family:var(--font-ui-mono);font-size:.75rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase}.auth__tabs button[aria-selected=true]{background:#fff;color:var(--c-ink);box-shadow:0 2px 8px #1025361a}.field input,.auth .field select{width:100%;min-height:3rem;padding:0 .95rem;border:1px solid var(--c-line-strong);border-radius:.9rem;background:#fff;font-size:var(--t-base)}.field input:focus,.field select:focus{border-color:var(--c-accent);outline:3px solid rgb(5 111 198 / .18);outline-offset:0}.auth__row{display:grid;grid-template-columns:1fr 1fr;gap:var(--s-3)}.auth__error{padding:.7rem .9rem;border-radius:.8rem;background:var(--c-bad-wash);color:var(--c-bad);font-size:var(--t-sm);font-weight:600}.auth__switch{color:var(--c-ink-soft);font-size:var(--t-sm);text-align:center}.auth__switch button{min-height:2.75rem;border:0;background:none;color:var(--c-accent-strong);cursor:pointer;font-weight:700;text-decoration:underline}.auth__note{padding:.75rem .9rem;border-radius:.8rem;background:#f0f2f4;color:var(--c-ink-soft);font-size:var(--t-xs)}@media(min-width:56rem){.auth{grid-template-columns:1.1fr 1fr}}.app__brand{display:inline-flex;align-items:center;gap:.5rem;color:var(--c-ink);text-decoration:none}.app__nav{display:flex;align-items:center;gap:var(--s-4)}.app__nav a,.app__nav button{display:inline-flex;align-items:center;min-height:2.75rem;padding:0;border:0;background:none;color:var(--c-ink-soft);cursor:pointer;font-family:var(--font-ui-mono);font-size:.75rem;font-weight:600;letter-spacing:.1em;text-decoration:none;text-transform:uppercase}.app__nav a:hover,.app__nav button:hover{color:var(--c-accent-strong)}.app__user{max-width:10rem;overflow:hidden;color:var(--c-ink);font-weight:700;text-overflow:ellipsis;white-space:nowrap}@media(max-width:42rem){.app__nav{display:flex;gap:var(--s-3)}.app__user{display:none}}.app__main--labs{max-width:76rem;gap:clamp(1.5rem,4vw,3rem)}.labs-page{display:flex;flex-direction:column;gap:clamp(1.5rem,4vw,3rem)}.labs-hero{display:flex;flex-direction:column;gap:var(--s-3);padding:clamp(1.5rem,5vw,3.5rem);border-radius:clamp(1.25rem,2.5vw,1.75rem);background:linear-gradient(180deg,#0a6edc99,#1482e640),#1a8fe6 var(--sky) center / cover;color:#fff}.labs-hero h1{font-size:clamp(2rem,1.2rem + 3.2vw,3.5rem);font-weight:500;letter-spacing:-.055em;line-height:1.02}.labs-hero h1 span{color:#e2f0ffd1}.lab-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s-3)}.lab-tile{display:flex;flex-direction:column;overflow:hidden;border-radius:1.5rem;background:#f0f2f4}.lab-tile img{width:100%;aspect-ratio:16 / 10;object-fit:cover}.lab-tile__body{display:flex;flex:1;flex-direction:column;align-items:flex-start;gap:var(--s-2);padding:1.2rem}.lab-tile__route{color:var(--c-ink-faint);font-family:var(--font-ui-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase}.lab-tile h2{font-size:1.4rem;font-weight:500;letter-spacing:-.04em}.lab-tile__body>p:not(.lab-tile__route){color:var(--c-ink-soft);font-size:var(--t-sm)}.lab-tile__body .pill,.lab-tile__soon{margin-top:auto}.lab-tile__soon{padding:.4rem .8rem;border-radius:var(--r-pill);background:#fff;color:var(--c-ink-soft);font-family:var(--font-ui-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase}.lab-tile--live{background:var(--c-lime)}.lab-tile--live .lab-tile__route,.lab-tile--live .lab-tile__body>p{color:var(--c-lime-ink)}.lab-tile--live .pill--lime{border-color:#0b0f14;background:#0b0f14;color:#fff}.lab-tile--live .arrow-dot{background:var(--c-lime);color:var(--c-lime-ink)}@media(min-width:40rem){.lab-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:64rem){.lab-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}.skip-link{position:absolute;top:-4rem;left:1rem;z-index:100;padding:.6rem 1rem;border-radius:var(--r-pill);background:#0b0f14;color:#fff;font-weight:700}.skip-link:focus{top:1rem}.landing__main{display:flex;flex-direction:column;gap:clamp(4rem,10vw,7.5rem)}.section-head{display:flex;flex-direction:column;align-items:center;gap:var(--s-3);max-width:44rem;margin:0 auto clamp(1.75rem,4vw,3rem);padding-inline:var(--s-4);text-align:center}.section-head h2{font-size:clamp(2rem,1.2rem + 3vw,3.25rem);font-weight:500;letter-spacing:-.055em;line-height:1.04}.section-head>p:not(.eyebrow){color:var(--c-ink-soft);font-size:var(--t-body)}.landing .eyebrow{color:var(--c-ink)}.landing section>:is(.facts,.promises),.landing :is(.why,.promises,.loop__steps,.showcase__grid,.audiences,.devices__row,.plans__grid,.trust__grid,.faq__list){width:100%;max-width:72rem;margin-inline:auto;padding-inline:clamp(.5rem,2vw,1rem)}.sky-nav__menu{display:none;place-items:center;width:2.75rem;height:2.75rem;border:1px solid rgb(255 255 255 / .3);border-radius:50%;background:#0d2a4a66;color:#fff;cursor:pointer}.mobile-menu{position:absolute;top:4.5rem;right:1rem;left:1rem;z-index:30;display:flex;flex-direction:column;padding:.5rem;border-radius:1.25rem;background:#fffffff7;box-shadow:0 20px 50px #001e5040}.mobile-menu button{min-height:3rem;padding:0 1rem;border:0;border-radius:.8rem;background:none;color:var(--c-ink);cursor:pointer;font-size:var(--t-body);font-weight:600;text-align:left}.mobile-menu button:hover{background:#f0f2f4}@media(max-width:52rem){.sky-nav__menu{display:grid}}.marquee__tick{display:grid;place-items:center;width:1.5rem;height:1.5rem;border-radius:50%;background:#eef2f5;color:#6b7785}.marquee__tick svg{width:14px;height:14px}.mini-steps{display:flex;gap:.2rem;margin-top:.5rem}.mini-steps i{flex:1;height:.35rem;border-radius:1rem;background:var(--c-line)}.mini-steps i[data-on="1"]{background:#1b7fe0}.arc-card .mini-note{margin-top:.45rem;color:var(--c-ink);font-weight:600}.why{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(1.5rem,4vw,3rem);align-items:center}.why__copy{display:flex;flex-direction:column;gap:var(--s-4)}.why__copy h2{font-size:clamp(1.9rem,1.2rem + 2.6vw,3rem);font-weight:500;letter-spacing:-.05em;line-height:1.05}.why__copy>p:not(.eyebrow){color:var(--c-ink-soft);font-size:var(--t-body)}.why__quote{margin:0;padding:clamp(1.5rem,4vw,2.5rem);border-radius:1.75rem;background:linear-gradient(160deg,#0a6edccc,#198ceb8c),#1a8fe6 var(--sky) center / cover;color:#fff}.why__quote blockquote{margin:0;font-size:clamp(1.5rem,1.1rem + 1.6vw,2.25rem);font-weight:500;letter-spacing:-.035em;line-height:1.15}.why__quote figcaption{margin-top:var(--s-4);color:#ffffffd9;font-family:var(--font-ui-mono);font-size:.75rem;letter-spacing:.1em;text-transform:uppercase}@media(min-width:52rem){.why{grid-template-columns:1.1fr .9fr}}.promises,.devices__row,.trust__grid{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s-3)}.promise,.device,.trust__item{display:flex;flex-direction:column;gap:var(--s-3);padding:clamp(1.25rem,3vw,1.75rem);border-radius:1.5rem;background:#f0f2f4}.promise h3,.device h3,.trust__item h3{font-size:1.3rem;font-weight:600;letter-spacing:-.03em}.promise p,.device p,.trust__item p{color:var(--c-ink-soft)}.promise__icon{display:grid;place-items:center;width:3rem;height:3rem;border-radius:50%;background:#fff;color:#1b7fe0}.promise:nth-child(2){background:var(--c-lime)}.promise:nth-child(2) p{color:var(--c-lime-ink)}.promise:nth-child(3){background:#0b0f14;color:#fff}.promise:nth-child(3) p{color:#ffffffbf}.promise:nth-child(3) .promise__icon{background:#ffffff1a;color:var(--c-lime)}@media(min-width:48rem){.promises,.devices__row{grid-template-columns:repeat(3,minmax(0,1fr))}.trust__grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:72rem){.trust__grid{grid-template-columns:repeat(4,minmax(0,1fr))}}.loop__steps{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s-3);counter-reset:none}.loop__step{position:relative;display:flex;flex-direction:column;gap:var(--s-2);padding:1.4rem;border:1px solid var(--c-line);border-radius:1.5rem;background:#fff}.loop__num{color:#1b7fe0;font-family:var(--font-ui-mono);font-size:.8rem;font-weight:600;letter-spacing:.1em}.loop__step h3{font-size:1.35rem;font-weight:600;letter-spacing:-.03em}.loop__step p{color:var(--c-ink-soft);font-size:var(--t-sm)}.loop__step:nth-child(3){border-color:var(--c-lime);background:var(--c-lime)}.loop__step:nth-child(3) p,.loop__step:nth-child(3) .loop__num{color:var(--c-lime-ink)}@media(min-width:40rem){.loop__steps{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:64rem){.loop__steps{grid-template-columns:repeat(5,minmax(0,1fr))}}.showcase__grid{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s-3)}.practical{display:flex;flex-direction:column;overflow:hidden;border-radius:1.5rem;background:#f0f2f4}.practical img{width:100%;aspect-ratio:16 / 10;object-fit:cover}.practical__body{display:flex;flex:1;flex-direction:column;align-items:flex-start;gap:var(--s-2);padding:1.25rem}.practical__subject{color:var(--c-ink-faint);font-family:var(--font-ui-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase}.practical h3{font-size:1.4rem;font-weight:500;letter-spacing:-.04em;line-height:1.1}.practical__body>p:not(.practical__subject){color:var(--c-ink-soft);font-size:var(--t-sm)}.practical__body .pill{margin-top:auto}.practical--feature{background:#0b0f14;color:#fff}.practical--feature .practical__subject{color:var(--c-lime)}.practical--feature .practical__body>p:not(.practical__subject){color:#ffffffbf}@media(min-width:40rem){.showcase__grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:64rem){.showcase__grid{grid-template-columns:1.4fr 1fr 1fr;grid-template-rows:auto auto}.practical--feature{grid-row:span 2}.practical--feature img{aspect-ratio:auto;flex:1;min-height:18rem}.practical--feature h3{font-size:2rem}}.audiences{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s-3)}.audience{display:flex;flex-direction:column;align-items:flex-start;gap:var(--s-4);padding:clamp(1.5rem,4vw,2.5rem);border-radius:1.75rem}.audience h2{font-size:clamp(1.8rem,1.2rem + 2vw,2.6rem);font-weight:500;letter-spacing:-.05em;line-height:1.05}.audience ul{display:grid;gap:var(--s-3)}.audience li{display:flex;align-items:flex-start;gap:var(--s-2);font-size:var(--t-body)}.audience li svg{flex:none;margin-top:.1rem}.audience--student{background:linear-gradient(160deg,#0a6edcd9,#198ceb99),#1a8fe6 var(--sky) center / cover;color:#fff}.audience--student .eyebrow{color:#fff}.audience--student li svg{color:var(--c-lime)}.audience--teacher{background:#f0f2f4}.audience--teacher li svg{color:#1b7fe0}.audience--teacher>p:not(.eyebrow){color:var(--c-ink-soft)}.audience__note{padding:var(--s-3) var(--s-4);border-left:3px solid var(--c-lime-ink);border-radius:.6rem;background:var(--c-lime);color:var(--c-lime-ink)!important;font-size:var(--t-sm)}@media(min-width:52rem){.audiences{grid-template-columns:1fr 1fr}}.plans__grid{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s-3)}.plan{display:flex;flex-direction:column;gap:var(--s-4);padding:clamp(1.5rem,3vw,2rem);border-radius:1.75rem}.plan__tag{font-family:var(--font-ui-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;opacity:.75}.plan h3{font-size:clamp(2rem,1.5rem + 1.5vw,2.6rem);font-weight:500;letter-spacing:-.05em}.plan ul{display:grid;flex:1;gap:var(--s-3)}.plan li{display:flex;align-items:flex-start;gap:var(--s-2)}.plan li svg{flex:none;margin-top:.1rem}.plan--soft{background:#f0f2f4}.plan--soft li svg{color:#1b7fe0}.plan--lime{background:var(--c-lime);color:var(--c-lime-ink)}.plan--dark{background:#0b0f14;color:#fff}.plan--dark li svg{color:var(--c-lime)}.pill--dark{border-color:#0b0f14;background:#0b0f14;color:#fff}.pill--dark:hover{background:#222a33}@media(min-width:52rem){.plans__grid{grid-template-columns:repeat(3,minmax(0,1fr))}}.faq__list{display:grid;gap:var(--s-2);max-width:52rem!important}.faq__item{border-radius:1.25rem;background:#f0f2f4}.faq__item summary{display:flex;align-items:center;justify-content:space-between;gap:var(--s-4);min-height:3.75rem;padding:.9rem 1.25rem;cursor:pointer;font-size:1.1rem;font-weight:600;letter-spacing:-.02em;list-style:none}.faq__item summary::-webkit-details-marker{display:none}.faq__item summary:after{display:grid;flex:none;place-items:center;width:2rem;height:2rem;border-radius:50%;background:#fff;content:"+";font-size:1.2rem;transition:transform var(--dur) var(--ease)}.faq__item[open] summary:after{transform:rotate(45deg)}.faq__item p{padding:0 1.25rem 1.25rem;color:var(--c-ink-soft);font-size:var(--t-body)}.final-cta{display:flex;flex-direction:column;align-items:center;gap:var(--s-4);width:100%;padding:clamp(3rem,8vw,5.5rem) var(--s-4);border-radius:clamp(1.25rem,2.5vw,1.75rem);background:linear-gradient(180deg,#0a6edc99,#1482e64d),#1a8fe6 var(--sky) center / cover;color:#fff;text-align:center}.final-cta h2{font-size:clamp(2.2rem,1.3rem + 3.5vw,4rem);font-weight:500;letter-spacing:-.06em;line-height:1}.final-cta h2 span{color:#e2f0ffd9}.final-cta p{color:#ffffffe6;font-size:var(--t-body)}.site-foot{display:flex;flex-direction:column;gap:var(--s-6);width:100%;max-width:72rem;margin:0 auto;padding:var(--s-6) clamp(.5rem,2vw,1rem) var(--s-5);border-top:1px solid var(--c-line)}.site-foot__top{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s-6)}.site-foot__brand{display:flex;flex-direction:column;gap:var(--s-3)}.site-foot__brand .sky-nav__brand{color:var(--c-ink)}.site-foot__brand p{color:var(--c-ink-soft)}.site-foot__cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--s-4)}.site-foot__cols h3{margin-bottom:var(--s-2);color:var(--c-ink-faint);font-family:var(--font-ui-mono);font-size:.72rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase}.site-foot__cols button{display:block;min-height:2.5rem;padding:0;border:0;background:none;color:var(--c-ink);cursor:pointer;font-weight:500;text-align:left}.site-foot__cols button:hover{color:var(--c-accent-strong)}.site-foot__bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:var(--s-2);color:var(--c-ink-faint);font-size:var(--t-xs)}@media(min-width:52rem){.site-foot__top{grid-template-columns:1fr 1.4fr}}