:root{color-scheme:light;--sun: #ffcc29;--sun-soft: #fff4c7;--sky: #45a5ff;--sky-soft: #e3f1ff;--grass: #33c46e;--grass-soft: #dcf6e6;--coral: #ff705e;--coral-soft: #ffe4df;--primary: #1457cc;--primary-hover: #1049b0;--primary-soft: #e3f1ff;--primary-tint: #0f3f99;--primary-ink: #0b2f73;--on-primary: #ffffff;--accent: #ffcc29;--accent-soft: #fff4c7;--accent-ink: #1a1d3a;--accent-shadow: #1a1d3a;--surface-0: #ffffff;--surface-1: #ffffff;--surface-2: #f5f7ff;--surface-3: #e9edfc;--surface-hover: rgba(26, 29, 58, .05);--surface-hover-strong: rgba(26, 29, 58, .09);--surface-tint: #f0f3fd;--backdrop: rgba(26, 29, 58, .55);--scrim: rgba(26, 29, 58, .35);--veil: rgba(255, 255, 255, .6);--surface-light: #ffffff;--surface-light-2: #f5f7ff;--surface-light-3: #e9edfc;--paper: #fffdf7;--paper-2: #f7f2e6;--paper-3: #efe7d3;--paper-border: #e4dac2;--ink: #1a1d3a;--ink-2: #474b6b;--ink-muted: #5d6182;--ink-highlight: #ffe58a;--ink-link: #1457cc;--line: #1a1d3a;--border: #dfe3f3;--border-strong: #767b9e;--border-light: #dfe3f3;--text-primary: #1a1d3a;--text-secondary: #474b6b;--text-muted: #5d6182;--text-on-light: #1a1d3a;--text-on-light-2: #474b6b;--text-on-dark: #ffffff;--text-on-dark-2: #dfe2f5;--success: #33c46e;--success-soft: #dcf6e6;--success-tint: #146c3a;--success-ink: #0f4f2b;--success-border: #33c46e;--danger: #c62828;--danger-fill: #ff705e;--danger-soft: #ffe4df;--danger-tint: #a61f1f;--danger-border: #e4574a;--locked: #5d6182;--locked-bg: #eceef7;--star: #ffcc29;--streak: #ff705e;--font-display: "Baloo 2", system-ui, sans-serif;--font-body: "Nunito", system-ui, -apple-system, "Segoe UI", sans-serif;--font-reading: "Nunito", system-ui, -apple-system, "Segoe UI", sans-serif;--fw-display: 800;--fs-display: clamp(30px, 3.6vw, 42px);--fs-heading: 22px;--fs-lead: 18px;--fs-body: 16px;--fs-caption: 14px;--fs-overline: 12px;--fs-reading: clamp(22px, 2.3vw, 30px);--lh-body: 1.55;--lh-reading: 1.75;--tracking-overline: .08em;--tracking-reading: .01em;--radius-sm: 10px;--radius-md: 16px;--radius-lg: 20px;--radius-xl: 28px;--radius-pill: 999px;--cover-ratio: 9 / 16;--cover-bg: #ffffff;--outline-w: 2px;--outline: var(--outline-w) solid var(--line);--press-sm: 0 3px 0 var(--line);--press: 0 5px 0 var(--line);--press-lg: 0 8px 0 var(--line);--elev-1: var(--press);--elev-2: 0 8px 0 var(--line), 0 24px 60px rgba(26, 29, 58, .25);--elev-paper: 0 6px 0 var(--line);--chunky-primary: var(--press);--chunky-accent: var(--press);--focus: #c2185b;--focus-ring: 3px solid var(--focus);--focus-offset: 3px;--z-base: 1;--z-hud: 100;--z-nav: 200;--z-overlay: 300;--z-modal: 400;--z-modal-2: 450;--z-toast: 500;--shell-top: 0px;--shell-bottom: 0px;--shell-max: 1200px;--header-h: var(--shell-top, 0px);--tabbar-h: var(--shell-bottom, 0px);--modal-gutter: 24px;--page-gutter: 16px;--tap-min: 44px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--space-6: 32px;--space-7: 48px}@media (min-width: 769px){:root{--page-gutter: 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var(--font-body)}.nf-input::placeholder{color:var(--text-muted)}.nf-input:hover{border-color:var(--line)}.nf-input:focus-visible{outline:var(--focus-ring);outline-offset:1px;border-color:var(--line)}.nf-field__error{font-size:var(--fs-caption);font-weight:700;color:var(--danger)}.nf-modal{position:fixed;top:0;right:0;bottom:0;left:0;z-index:var(--z-modal);display:grid;place-items:center;padding:var(--modal-gutter)}.nf-modal--layer-2{z-index:var(--z-modal-2)}.nf-modal__backdrop{position:absolute;top:0;right:0;bottom:0;left:0;background:var(--backdrop);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);animation:nfFade .16s ease-out}.nf-modal__card{position:relative;z-index:1;width:100%;max-width:520px;max-height:calc(100dvh - 2 * var(--modal-gutter) - 8px);display:flex;flex-direction:column;border-radius:var(--radius-xl);border:var(--outline);box-shadow:var(--elev-2);background:var(--surface-1);color:var(--text-primary);animation:nfPop .22s 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24px);border-bottom:none;border-radius:var(--radius-xl) var(--radius-xl) 0 0;animation:nfSheet .24s cubic-bezier(.2,.9,.3,1)}.nf-modal.nf-modal--sheet .nf-modal__foot{padding:var(--space-3) 20px calc(var(--space-4) + env(safe-area-inset-bottom,0px));border-top:1px solid var(--border)}@keyframes nfSheet{0%{transform:translateY(100%)}to{transform:none}}@keyframes nfFade{0%{opacity:0}to{opacity:1}}@keyframes nfPop{0%{opacity:0;transform:translateY(16px) scale(.96)}to{opacity:1;transform:none}}@media (max-width: 480px){.nf-modal{padding:var(--space-3);--modal-gutter: 12px}.nf-modal__title{font-size:23px}}.nf-seg{display:inline-flex;gap:var(--space-1);padding:var(--space-1);max-width:100%;min-width:0;border-radius:var(--radius-pill);background:var(--surface-tint);border:var(--outline)}.nf-seg--fill{display:flex;width:100%}.nf-seg--fill .nf-seg__btn{flex:1}.nf-seg__btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:0;min-height:var(--tap-min);padding:0 14px;border:var(--outline-w) solid transparent;border-radius:var(--radius-pill);background:transparent;color:var(--text-secondary);font-family:var(--font-display);font-weight:var(--fw-display);font-size:16px;cursor:pointer}@media (prefers-reduced-motion: no-preference){.nf-seg__btn{transition:background .12s ease,color .12s ease}}@media (hover: hover) and (pointer: fine){.nf-seg__btn:hover{color:var(--text-primary);background:var(--surface-hover-strong)}}.nf-seg__btn.is-active{background:var(--primary);color:var(--on-primary);border-color:var(--line)}.nf-seg__btn:disabled{opacity:.5;cursor:not-allowed}.nf-seg__btn:focus-visible{outline:var(--focus-ring);outline-offset:1px}.nf-seg--sm .nf-seg__btn{min-height:38px;font-size:15px;padding:0 12px}.nf-seg__item{display:flex;align-items:center;gap:2px;border-radius:var(--radius-pill);border:var(--outline-w) solid transparent}.nf-seg__item 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fine){.nf-stat[type=button]:hover{background:var(--sun-soft)}}.nf-stat[type=button]:active{transform:translateY(3px);box-shadow:none}.nf-stat--sm{min-height:32px;font-size:15px;padding:0 10px 0 3px;gap:6px}.nf-stat--sm .nf-stat__icon{width:24px;height:24px}.nf-stat__icon{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;border:var(--outline);background:var(--sky);color:var(--ink)}.nf-stat__icon img{width:20px;height:20px;object-fit:contain}.nf-stat--stars .nf-stat__icon,.nf-stat--reward .nf-stat__icon{background:var(--sun)}.nf-stat--streak .nf-stat__icon{background:var(--coral)}.nf-stat--books .nf-stat__icon{background:var(--grass)}.nf-stat--words .nf-stat__icon{background:var(--sky)}.nf-stat__suffix{font-family:var(--font-body);font-size:var(--fs-overline);font-weight:800;color:var(--text-muted);padding-left:var(--space-2);border-left:1px solid var(--border)}.nf-pill{display:inline-flex;align-items:center;gap:6px;min-height:26px;padding:0 10px;border-radius:var(--radius-pill);border:var(--outline-w) solid transparent;font-family:var(--font-body);font-size:var(--fs-caption);font-weight:800;line-height:1;white-space:nowrap}.nf-pill--sm{min-height:22px;padding:0 8px;font-size:var(--fs-overline)}.nf-pill--neutral{background:var(--surface-tint);color:var(--text-secondary)}.nf-pill--primary{background:var(--primary-soft);color:var(--primary-tint)}.nf-pill--accent{background:var(--sun);color:var(--ink);border-color:var(--line)}.nf-pill--success{background:var(--grass-soft);color:var(--success-tint)}.nf-pill--danger{background:var(--danger-soft);color:var(--danger-tint)}.nf-pill--locked{background:var(--locked-bg);color:var(--locked)}.nf-pill__icon{display:inline-grid;place-items:center}.nf-popover{position:fixed;z-index:var(--z-overlay);width:min(300px,100vw - 24px);padding:14px var(--space-4);border-radius:var(--radius-md);border:var(--outline);background:var(--surface-1);color:var(--text-primary);box-shadow:var(--press);font-family:var(--font-body);font-size:var(--fs-body);line-height:1.45;animation:nfPop .16s ease-out}.nf-popover__arrow{position:absolute;width:14px;height:14px;background:var(--surface-1);border:var(--outline);transform:translate(-50%) rotate(45deg)}.nf-popover--bottom .nf-popover__arrow{top:-9px;border-right:none;border-bottom:none}.nf-popover--top .nf-popover__arrow{bottom:-9px;border-left:none;border-top:none}.nf-popover__title{font-family:var(--font-display);font-weight:var(--fw-display);font-size:18px;margin:0 0 var(--space-1)}.nf-toast-host{position:fixed;top:calc(var(--shell-top) + var(--space-3) + env(safe-area-inset-top,0px));right:var(--space-4);z-index:var(--z-toast);display:flex;flex-direction:column;gap:var(--space-3);width:min(360px,100vw - 32px);pointer-events:none}@media (max-width: 520px){.nf-toast-host{left:var(--space-4);right:var(--space-4);width:auto}}.nf-toast{pointer-events:auto;display:flex;align-items:flex-start;gap:10px;padding:var(--space-3) var(--space-3) var(--space-3) 14px;border-radius:var(--radius-md);background:var(--surface-1);color:var(--text-primary);border:var(--outline);box-shadow:var(--press);font-family:var(--font-body)}@media (prefers-reduced-motion: no-preference){.nf-toast{animation:nfToastIn .26s cubic-bezier(.3,1.3,.5,1)}}.nf-toast--error{background:var(--danger-soft)}.nf-toast--success{background:var(--grass-soft)}.nf-toast__icon{flex:0 0 28px;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;border:var(--outline);background:var(--sky);color:var(--ink)}.nf-toast--error .nf-toast__icon{background:var(--coral)}.nf-toast--success 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var(--space-5)}.nf-empty__badge{width:88px;height:88px;border-radius:28px;display:grid;place-items:center;background:var(--sun);color:var(--ink);border:var(--outline);box-shadow:var(--press);transform:rotate(-5deg)}.nf-empty__actions{display:flex;gap:var(--space-3);flex-wrap:wrap;justify-content:center;margin-top:var(--space-2)}.nf-notfound{min-height:calc(100vh - var(--shell-top) - var(--shell-bottom));display:grid;place-items:center;padding:var(--space-6) var(--page-gutter)}.nf-notfound__card{width:100%;max-width:520px}.nf-notfound__code{display:inline-block;padding:0 16px;border-radius:var(--radius-md);border:var(--outline);box-shadow:var(--press);background:var(--sun);font-family:var(--font-display);font-weight:var(--fw-display);font-size:64px;line-height:1.1;color:var(--ink);transform:rotate(-3deg)}@media (max-width: 480px){.nf-notfound__code{font-size:52px}}.nf-tone--sun{--tile: var(--sun);--tile-soft: var(--sun-soft)}.nf-tone--sky{--tile: var(--sky);--tile-soft: 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env(safe-area-inset-bottom,0px))}}@media (min-width: 1025px){.reader-stage{min-height:0;display:flex;padding:var(--space-5) var(--space-5) var(--space-4)}.reader--aloud .reader-stage{padding-bottom:var(--space-3)}}.reader-stage--message{display:grid;place-items:center}.reader-stage--end{padding-top:var(--space-5);padding-bottom:calc(var(--reader-bar-h) + var(--space-6))}@media (min-width: 1025px){.reader-stage--end{display:block}}.reader-book{position:relative;width:100%;max-width:720px;margin:0 auto;overflow:hidden;border-radius:var(--radius-xl)}@media (min-width: 1025px){.reader-book{max-width:1240px;height:100%;max-height:780px;margin:auto}}.reader-page{display:flex;flex-direction:column}@media (min-width: 1025px){.reader-page{height:100%;display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr)}.reader-book--wide .reader-page{grid-template-columns:minmax(0,1fr);grid-template-rows:auto minmax(0,1fr)}}@media (prefers-reduced-motion: no-preference){.reader-page--next{animation:readerPageNext .28s cubic-bezier(.2,.8,.2,1)}.reader-page--prev{animation:readerPagePrev .28s cubic-bezier(.2,.8,.2,1)}}@keyframes readerPageNext{0%{opacity:0;transform:translate(32px)}to{opacity:1;transform:none}}@keyframes readerPagePrev{0%{opacity:0;transform:translate(-32px)}to{opacity:1;transform:none}}.reader-book__art{position:relative;display:grid;place-items:center;background:var(--paper-2);border-bottom:1px solid var(--paper-border)}.reader-book__art img{display:block;width:100%;height:auto;max-height:52vh;object-fit:contain}@media (min-width: 1025px){.reader-book__art{min-height:0;overflow:hidden;border-bottom:none;border-right:1px solid var(--paper-border);box-shadow:inset -18px 0 24px -22px color-mix(in srgb,var(--ink) 45%,transparent)}.reader-book__art img{position:absolute;top:var(--space-5);left:var(--space-5);width:calc(100% - 2 * var(--space-5));height:calc(100% - 2 * 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var(--line)}.read-aloud__mic:disabled{background:var(--surface-3);color:var(--text-muted);box-shadow:none;cursor:not-allowed}.read-aloud__mic.is-on{background:var(--coral);color:var(--ink);box-shadow:var(--press)}.read-aloud__mic.is-on:after{content:"";position:absolute;top:-6px;right:-6px;bottom:-6px;left:-6px;border-radius:50%;border:2px solid var(--danger-border)}@media (prefers-reduced-motion: no-preference){.read-aloud__mic.is-on:after{animation:readerMicPulse 1.4s ease-out infinite}}@keyframes readerMicPulse{0%{transform:scale(.9);opacity:1}to{transform:scale(1.35);opacity:0}}.star-meter{position:relative;flex:none;display:inline-flex;align-items:center;gap:4px;height:40px;padding:2px 12px 2px 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starCount{40%{transform:scale(1.35)}}@keyframes starPlus{0%{opacity:0;transform:translateY(4px) scale(.6)}25%{opacity:1;transform:translateY(-14px) scale(1.15)}to{opacity:0;transform:translateY(-30px) scale(1)}}.nf-popover.reader-popover{width:min(380px,100vw - 24px);padding:var(--space-4) 18px;background:var(--paper);color:var(--ink)}.nf-popover.reader-popover .nf-popover__arrow{background:var(--paper)}@media (max-width: 768px){.nf-modal.reader-sheet{place-items:end stretch;padding:0}.nf-modal.reader-sheet .nf-modal__card{max-width:none;border-radius:var(--radius-xl) var(--radius-xl) 0 0;border-bottom:none;box-shadow:none;padding-bottom:env(safe-area-inset-bottom,0px)}}@media (max-width: 768px) and (prefers-reduced-motion: no-preference){.nf-modal.reader-sheet .nf-modal__card{animation:readerSheetUp .26s cubic-bezier(.2,.8,.2,1)}}.nf-modal.reader-sheet .nf-modal__card{background:var(--paper);color:var(--ink)}.nf-modal.reader-sheet .nf-modal__head{padding:var(--space-3) var(--space-3) 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and (pointer: fine){.word-card__more:hover{text-decoration:underline}}.focus-card__body{display:flex;flex-direction:column;gap:var(--space-4)}.focus-card__label{margin:0 0 var(--space-2);font:800 var(--fs-overline)/1 var(--font-body);letter-spacing:var(--tracking-overline);text-transform:uppercase;color:var(--text-secondary)}.focus-card__chips{display:flex;flex-wrap:wrap;gap:var(--space-2)}.focus-card__label--gap{margin-top:var(--space-3)}.focus-card__step{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3);border-radius:var(--radius-md);border:var(--outline);background:var(--sun-soft)}.focus-card__step .focus-card__label{margin-bottom:4px}.focus-card__step-num{flex:none;display:grid;place-items:center;width:52px;height:52px;border-radius:var(--radius-md);border:var(--outline);background:var(--sun);color:var(--ink);font:var(--fw-display) 26px/1 var(--font-display);transform:rotate(-4deg)}.focus-card__spellings{margin:0;font:800 22px/1.2 var(--font-reading);color:var(--ink)}.focus-card__hearts{list-style:none;margin:0 0 var(--space-2);padding:0;display:flex;flex-wrap:wrap;gap:var(--space-2)}.focus-card__hearts li{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:0 12px;border-radius:var(--radius-pill);border:var(--outline);background:var(--coral-soft);color:var(--ink);font:700 18px/1 var(--font-reading)}.focus-card__note{margin:0;font-size:var(--fs-caption);color:var(--text-secondary);line-height:1.45}.focus-chip{display:inline-flex;flex-direction:column;align-items:center;gap:2px;min-width:64px;padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);border:var(--outline);background:var(--sky-soft)}.focus-chip__g{font:800 24px/1.1 var(--font-reading);color:var(--ink);white-space:pre}.focus-chip__ex{font-size:var(--fs-caption);color:var(--text-on-light-2)}.focus-card__examples{margin:0;font:600 var(--fs-lead)/1.5 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var(--space-4);border-radius:var(--radius-md);border:var(--outline);background:var(--surface-1);box-shadow:var(--press-sm)}.assignment-strip.is-recording{background:var(--coral-soft)}.assignment-strip__text{flex:1;min-width:180px;display:flex;flex-direction:column;gap:2px}.assignment-strip__msg{font-size:var(--fs-body);color:var(--text-secondary)}.assignment-strip__error{font-size:var(--fs-caption);color:var(--danger-tint)}.assignment-strip__audio{height:36px;max-width:260px}.assignment-strip__actions{display:flex;align-items:center;gap:var(--space-2)}.assignment-strip__bars{display:inline-flex;align-items:flex-end;gap:3px;height:22px}.assignment-strip__bars span{width:4px;height:100%;border-radius:2px;background:var(--danger);transform-origin:bottom}@media (prefers-reduced-motion: no-preference){.assignment-strip__bars span{animation:readerBars .9s ease-in-out infinite}}.assignment-strip__bars span:nth-child(2){animation-delay:.12s}.assignment-strip__bars 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var(--space-3) var(--space-3);border-radius:var(--radius-lg);border:var(--outline);background:var(--surface-1);box-shadow:var(--press-sm);color:var(--ink);font:700 clamp(18px,var(--reader-fs) * .78,26px)/1.3 var(--font-reading);text-align:left;cursor:pointer}@media (prefers-reduced-motion: no-preference){.quiz__option{transition:background .14s ease,transform .1s ease,box-shadow .1s ease}}@media (hover: hover) and (pointer: fine){.quiz__option:hover{background:var(--sun-soft)}}.quiz__option:active{transform:translateY(3px);box-shadow:none}.quiz__option.is-picked{background:var(--sky-soft)}.quiz__option.is-correct{background:var(--grass-soft)}.quiz__option.is-correct .quiz__letter{background:var(--grass);color:var(--ink)}@media (prefers-reduced-motion: no-preference){.quiz__option.is-correct{animation:quizRight .36s ease-out}}.quiz__option.is-wrong{background:var(--coral-soft)}.quiz__option.is-wrong .quiz__letter{background:var(--coral);color:var(--ink)}@media (prefers-reduced-motion: 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no-preference){.skeleton{animation:readerShimmer 1.4s linear infinite}}.skeleton--line{display:block;width:100%;height:22px;border-radius:var(--radius-sm)}.skeleton--short{width:60%}@keyframes readerShimmer{0%{background-position:100% 0}to{background-position:-100% 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