:root{--not-seen:var(--vq-ink-subtle);--not-seen-soft:var(--vq-surface-muted);--learning:var(--vq-ink);--learning-copy:var(--vq-ink);--learning-soft:var(--vq-accent-soft);--mastered:var(--vq-ink);--mastered-soft:var(--vq-ink)}
.app-shell.welcome-shell{display:block;overflow:hidden;background:transparent}
.welcome-shell .onboarding{position:relative;display:grid;width:100%;height:100%;min-height:0;grid-template-rows:auto minmax(0,1fr) 58px;border:0;border-radius:0;background:transparent;box-shadow:none;overflow:hidden;text-align:center}
.learning-watermark{position:absolute;inset:0;z-index:1;overflow:hidden;pointer-events:none;transition:opacity .3s ease}
.onboarding.is-final-slide .learning-watermark{opacity:0}
.learning-watermark span{position:absolute;max-width:42vw;overflow:hidden;border:var(--vq-border-width) solid var(--vq-line);border-radius:999px;padding:7px 12px;background:var(--vq-paper);color:var(--vq-ink-subtle);opacity:.55;font:800 clamp(.58rem,2.4vw,.76rem)/1 var(--font-ui);text-overflow:ellipsis;white-space:nowrap}
.learning-watermark span:nth-child(1){top:7%;left:-3%;transform:rotate(-8deg)}.learning-watermark span:nth-child(2){top:19%;right:-4%;transform:rotate(7deg)}.learning-watermark span:nth-child(3){top:34%;left:5%;transform:rotate(5deg)}.learning-watermark span:nth-child(4){top:47%;right:3%;transform:rotate(-7deg)}.learning-watermark span:nth-child(5){top:60%;left:-2%;transform:rotate(-5deg)}.learning-watermark span:nth-child(6){top:72%;right:-3%;transform:rotate(8deg)}.learning-watermark span:nth-child(7){top:84%;left:9%;transform:rotate(4deg)}.learning-watermark span:nth-child(8){top:91%;right:8%;transform:rotate(-4deg)}
.knowledge-flow,.onboarding-viewport,.onboarding-controls{position:relative;z-index:2}
.knowledge-flow{display:grid;gap:13px;padding:calc(20px + 10vh) 18px 8px;background:transparent;text-align:center}.knowledge-flow>strong{color:var(--app-ink);font:900 1rem/1.1 var(--font-ui);letter-spacing:-.025em}
.onboarding[data-knowledge-state="0"] .knowledge-flow>strong{color:var(--not-seen)}.onboarding[data-knowledge-state="1"] .knowledge-flow>strong{color:var(--learning)}.onboarding[data-knowledge-state="2"] .knowledge-flow>strong{color:var(--mastered)}
.knowledge-flow ol{position:relative;display:grid;grid-template-columns:repeat(3,1fr);margin:0;padding:0;list-style:none}.knowledge-flow ol::before,.knowledge-flow ol::after{content:"";position:absolute;top:2px;left:16.666%;height:3px;border-radius:999px}.knowledge-flow ol::before{width:66.668%;background:var(--vq-line)}.knowledge-flow ol::after{width:0;background:var(--not-seen);transition:width .35s ease,background-color .25s ease}.onboarding[data-knowledge-state="1"] .knowledge-flow ol::after{width:33.334%;background:var(--learning)}.onboarding[data-knowledge-state="2"] .knowledge-flow ol::after{width:66.668%;background:var(--mastered)}.knowledge-flow li{--state-color:var(--not-seen);--state-soft:var(--not-seen-soft);position:relative;padding-top:20px;color:var(--vq-ink-subtle);font:var(--vq-weight-bold) .65rem/1 var(--font-ui);text-align:center}.knowledge-flow li:nth-child(2){--state-color:var(--learning);--state-soft:var(--learning-soft)}.knowledge-flow li:nth-child(3){--state-color:var(--mastered);--state-soft:var(--mastered-soft)}
.knowledge-flow li::after{content:"";position:absolute;z-index:1;top:-1px;left:50%;width:9px;height:9px;border:var(--vq-border-width) solid var(--vq-ink-subtle);border-radius:50%;background:var(--vq-paper);transform:translateX(-50%)}
.knowledge-flow li button{width:100%;border:0;padding:0;background:transparent;color:inherit;font:inherit;cursor:pointer}.knowledge-flow li.is-complete,.knowledge-flow li.is-active{color:var(--state-color)}.knowledge-flow li.is-complete::after{border-color:var(--state-color);background:var(--state-color)}.knowledge-flow li.is-active{font-weight:900}.knowledge-flow li.is-active::after{border-color:var(--state-color);background:var(--state-color);box-shadow:0 0 0 4px var(--state-soft)}
.onboarding.is-final-slide{grid-template-rows:0 minmax(0,1fr) 58px}.onboarding.is-final-slide .knowledge-flow{visibility:hidden;overflow:hidden;padding:0;border:0}
.onboarding-viewport{min-width:0;min-height:0;overflow:hidden;touch-action:pan-y;background:transparent}.onboarding-track{display:flex;width:100%;height:100%;transition:transform .42s cubic-bezier(.2,.8,.2,1);will-change:transform}
.onboarding-slide{display:flex;min-width:100%;height:100%;min-height:0;padding:clamp(26px,6vh,54px) 20px 22px;flex-direction:column;align-items:center;justify-content:center;gap:clamp(24px,5vh,42px);overflow-y:auto;overscroll-behavior:contain;background:transparent}.onboarding-slide.state-slide{justify-content:flex-start;padding-top:clamp(42px,6vh,58px)}
.slide-copy{width:100%;max-width:520px;min-height:0}.onboarding-slide h1{margin:0;color:var(--app-ink);font:900 clamp(2.75rem,14vw,4.6rem)/.95 var(--font-ui);letter-spacing:-.065em}.onboarding-slide .slide-copy>p:last-child{max-width:430px;margin:20px auto 0;color:var(--vq-ink-muted);font:650 clamp(.94rem,4vw,1.08rem)/1.5 var(--font-ui)}
.state-visual{display:grid;width:clamp(112px,35vw,150px);height:clamp(112px,35vw,150px);flex:0 0 auto;place-items:center;border:var(--vq-border);border-radius:var(--vq-radius-lg);background:var(--vq-surface);color:var(--vq-ink)}.state-visual span{font:900 clamp(3.4rem,14vw,5.8rem)/1 var(--font-ui)}.learning-progress-icon{display:block;width:clamp(52px,15vw,68px);height:clamp(52px,15vw,68px);border:clamp(7px,2vw,10px) solid color-mix(in srgb,currentColor 22%,transparent);border-top-color:currentColor;border-right-color:currentColor;border-radius:50%;transform:rotate(18deg)}.mastered-trophy{width:clamp(58px,17vw,76px);height:clamp(58px,17vw,76px);stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.is-not-seen .state-visual{border-color:var(--vq-ink-subtle);color:var(--vq-ink-subtle)}.is-learning .state-visual{border-style:dashed;color:var(--vq-ink)}.is-mastered .state-visual{background:var(--vq-ink);color:var(--vq-on-ink)}.is-not-seen h1{color:var(--vq-ink-muted)}.is-learning h1{color:var(--learning)}.is-learning .slide-copy>p:last-child{color:var(--learning-copy)}.is-mastered h1{color:var(--mastered)}
.final-slide{justify-content:space-between;padding-top:clamp(34px,7vh,60px);padding-bottom:24px}.final-slide .slide-copy{margin:auto 0}.final-slide .audience-label{margin:0 0 var(--vq-space-4);color:var(--vq-accent);font:var(--vq-weight-bold) var(--vq-text-sm)/1.2 var(--font-ui);letter-spacing:.08em}.final-slide h1{font-family:var(--font-editorial);font-size:clamp(2.5rem,12vw,4.25rem);line-height:.96}.final-slide h1 em,.final-slide h2 em{color:var(--vq-accent);font-style:normal}.final-slide h2{max-width:440px;margin:24px auto 0;color:var(--app-ink);font:850 clamp(1.22rem,5vw,1.75rem)/1.15 var(--font-ui);letter-spacing:-.035em}
.welcome-actions{display:grid;width:100%;max-width:none;grid-template-columns:1fr;gap:10px}.welcome-actions>strong{margin:0 0 4px;color:var(--app-ink);font:900 1.05rem/1 var(--font-ui)}.welcome-actions .primary-action,.secondary-action{width:100%;min-height:52px;border:var(--vq-border);border-radius:var(--vq-radius-sm)}.secondary-action{display:inline-flex;align-items:center;justify-content:center;background:var(--vq-surface);color:var(--vq-ink);font:var(--vq-weight-bold) .95rem/1 var(--font-ui);text-decoration:none}
.onboarding-controls{display:grid;height:58px;grid-template-columns:44px auto 44px;align-items:center;justify-content:space-between;padding:5px 14px max(5px,env(safe-area-inset-bottom));border-top:var(--vq-border);background:var(--vq-paper)}.onboarding-controls>button{display:grid;width:40px;height:40px;place-items:center;border:var(--vq-border);border-radius:50%;background:var(--vq-surface);color:var(--vq-ink);cursor:pointer}.onboarding-controls>button:last-child{justify-self:end;background:var(--app-ink);color:var(--vq-on-ink)}.onboarding-controls>button:disabled{opacity:.25}.onboarding-controls>button[hidden]{visibility:hidden;display:grid!important}/* New visitors jump straight to the sign-up choices without paging through the explainer. */.onboarding-controls>.slide-skip{width:auto;min-width:0;padding:0 var(--vq-space-4);border-radius:var(--vq-radius-pill);background:var(--vq-surface);font:var(--vq-weight-bold) var(--vq-text-sm)/1 var(--vq-font)}.onboarding-controls>button span{font:800 1.25rem/1 var(--font-ui)}
@media(min-width:681px){.onboarding-slide{padding-inline:40px}}
@media(max-height:560px){.knowledge-flow{padding-top:18px}.onboarding-slide,.onboarding-slide.state-slide{padding:16px 20px;gap:14px}.state-visual{width:86px;height:86px;flex-basis:86px;border-radius:24px}.state-visual span{font-size:3rem}.final-slide{padding:18px 20px;gap:12px}.final-slide h1{font-size:2.2rem}.final-slide h2{margin-top:12px;font-size:1.1rem}.welcome-actions{grid-template-columns:1fr}.welcome-actions>strong{grid-column:1/-1}}
@media(prefers-reduced-motion:reduce){.onboarding-track,.learning-watermark{transition:none}}

/* Install the app (app-shell.js); hidden inside the installed app. */
.welcome-install{grid-column:1/-1;min-height:var(--vq-tap);border:0;background:transparent;color:var(--vq-accent);font:var(--vq-weight-bold) var(--vq-text-sm)/1 var(--vq-font);text-decoration:underline;text-underline-offset:4px;cursor:pointer}
.welcome-install:focus-visible{outline:3px solid var(--vq-focus);outline-offset:2px;border-radius:var(--vq-radius-sm)}
/* Parents-only welcome: a salutation above the headline, and a quiet link for a child who has a code. */
.final-slide .welcome-salutation{margin:0 0 var(--vq-space-3);color:var(--app-ink);font:var(--vq-weight-bold) var(--vq-text-lg)/1.2 var(--vq-font)}
.final-slide h2 em{white-space:nowrap}
.welcome-link{display:inline-flex;min-height:var(--vq-tap);align-items:center;justify-content:center;color:var(--vq-accent);font:var(--vq-weight-bold) var(--vq-text-sm)/1 var(--vq-font);text-decoration:underline;text-underline-offset:4px}
.welcome-link:focus-visible{outline:3px solid var(--vq-focus);outline-offset:2px;border-radius:var(--vq-radius-sm)}
.welcome-note{grid-column:1/-1;margin:0;color:var(--vq-ink-muted);font:var(--vq-weight-medium) var(--vq-text-xs)/1.35 var(--vq-font);text-align:center}
.welcome-note[hidden]{display:none}

/* The welcome is one screen: no explainer slides, stepper or slide controls. */
.onboarding.welcome-single{grid-template-rows:minmax(0,1fr)}
.welcome-fineprint{grid-column:1/-1;margin:0;color:var(--vq-ink-muted);font:var(--vq-weight-medium) var(--vq-text-xs)/1.35 var(--vq-font);text-align:center}
.welcome-fineprint a{color:inherit;text-decoration:underline}