.guided-shell,.lessons-app-shell{--gl-bg:#fff7ec;--gl-paper:#fff;--gl-panel:#fff0da;--gl-ink:#2c241c;--gl-text:#493a2e;--gl-muted:#76604a;--gl-line:#ead8c2;--gl-accent:#b83b0b;--gl-cta:#ff8a1f;--gl-on-cta:#2b180d;--gl-on-accent:#fff;--gl-soft:#ffe2bc;--gl-good:#23714e;--gl-good-bg:#edf8f2;--gl-wrong:#914629;--gl-wrong-bg:#fff3ec;--gl-size:19px;background:var(--gl-bg);color:var(--gl-ink);font-family:var(--font-mission-geist),var(--font-inter),system-ui,sans-serif;line-height:1.5;color-scheme:light}.dark .guided-shell:not([data-theme=light]):not([data-theme=system]),.dark .lessons-app-shell,.guided-shell[data-theme=dark]{--gl-bg:#191410;--gl-paper:#241b17;--gl-panel:#33271f;--gl-ink:#fff5e8;--gl-text:#eee0d2;--gl-muted:#c5b19f;--gl-line:#534034;--gl-accent:#ffad66;--gl-cta:#ff9e45;--gl-on-cta:#2b180d;--gl-on-accent:#261608;--gl-soft:#4a2e19;--gl-good:#88d5ac;--gl-good-bg:#1c392e;--gl-wrong:#f0b798;--gl-wrong-bg:#402e29;color-scheme:dark}@media(prefers-color-scheme:dark){.guided-shell[data-theme=system]{--gl-bg:#191410;--gl-paper:#241b17;--gl-panel:#33271f;--gl-ink:#fff5e8;--gl-text:#eee0d2;--gl-muted:#c5b19f;--gl-line:#534034;--gl-accent:#ffad66;--gl-cta:#ff9e45;--gl-on-cta:#2b180d;--gl-on-accent:#261608;--gl-soft:#4a2e19;--gl-good:#88d5ac;--gl-good-bg:#1c392e;--gl-wrong:#f0b798;--gl-wrong-bg:#402e29;color-scheme:dark}}.guided-shell *{box-sizing:border-box}.guided-shell a,.guided-shell button{-webkit-tap-highlight-color:transparent}.guided-shell button{font:inherit;cursor:pointer}.guided-shell button:disabled{opacity:.48;cursor:default}.guided-shell a{color:inherit;text-decoration:none}.guided-shell :focus-visible{outline:3px solid var(--gl-accent);outline-offset:4px}.guided-shell h1:focus{outline:none}.guided-shell h1,.guided-shell h2,.guided-shell h3{font-family:inherit;color:var(--gl-ink);text-wrap:pretty}.guided-shell h1{font-weight:650;letter-spacing:-.035em;line-height:1.13}.guided-shell h2{font-weight:620;letter-spacing:-.02em;line-height:1.3}.guided-shell svg{width:20px;height:20px;stroke-width:1.8;flex-shrink:0}.guided-shell [hidden]{display:none!important}.gl-icon-button{border:0;background:transparent;color:var(--gl-text);min-width:44px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:12px;padding:10px;gap:8px}.gl-icon-button:hover{background:var(--gl-panel);color:var(--gl-ink)}.gl-icon-button svg{width:21px;height:21px}.gl-button{min-height:52px;padding:13px 22px;border-radius:13px;border:1px solid var(--gl-line);display:inline-flex;align-items:center;justify-content:center;gap:10px;font-size:15px!important;font-weight:600!important;text-align:center;transition:background .15s,box-shadow .15s}.gl-primary{background:var(--gl-cta);color:var(--gl-on-cta)!important;border-color:transparent;box-shadow:0 3px 9px #c947101a}.gl-primary:hover:not(:disabled){box-shadow:0 5px 16px #c9471029}.gl-secondary{background:var(--gl-paper);color:var(--gl-text)}.gl-secondary:hover{background:var(--gl-panel)}.gl-full{width:100%}.gl-text-button{background:none;border:0;color:var(--gl-accent)!important;font-weight:550;min-height:44px;padding:8px 0;text-align:left;display:inline-flex;align-items:center;gap:8px;font-size:14px}.gl-eyebrow{font-size:11px;font-weight:650;letter-spacing:.08em;text-transform:uppercase;color:var(--gl-accent);margin:0 0 12px;display:flex;align-items:center;gap:7px}.gl-eyebrow svg{width:16px;height:16px}.gl-save-note{font-size:12px!important;color:var(--gl-muted);line-height:1.6}.gl-book-symbol,.gl-identity-mark{width:56px;height:56px;border-radius:18px;background:var(--gl-soft);color:var(--gl-accent);display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}.gl-book-symbol svg,.gl-identity-mark svg{width:27px;height:27px}.gl-sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.lessons-app-shell .app-shell-column{max-width:1160px;background:var(--gl-bg);box-shadow:none}.lessons-app-shell .app-shell-main{padding-bottom:86px}.lessons-app-shell .app-shell-bottom-nav{max-width:760px}.lessons-app-shell .bottom-nav-contrast-scope{--surface:var(--gl-paper);--border:var(--gl-line);--small-muted-aa:var(--gl-muted);--small-accent-aa:var(--gl-accent);background:var(--gl-paper);border-color:var(--gl-line);font-family:var(--font-mission-geist),system-ui,sans-serif}.lessons-app-shell .bottom-nav-contrast-scope [aria-current=page]{background:var(--gl-soft)}.lessons-app-shell .bottom-nav-contrast-scope a{margin:5px 2px;padding:6px 3px}.lessons-app-shell .bottom-nav-contrast-scope span{font-size:10px}.gl-navigation{position:sticky;top:0;z-index:40;background:var(--gl-bg)}.gl-library-bar{height:72px;padding:10px 26px;display:grid;grid-template-columns:44px 1fr 44px;align-items:center}.gl-library-brand{display:inline-flex;justify-content:center;align-items:center;gap:9px;font-size:18px;font-weight:650;letter-spacing:-.03em}.gl-library-brand svg{color:var(--gl-accent);width:23px;height:23px}.gl-library-menu header .gl-eyebrow{margin:0 0 8px}.gl-library-menu header h2{font-size:23px}.gl-menu-link{display:flex;align-items:center;gap:14px;padding:17px 0;border-bottom:1px solid var(--gl-line)}.gl-menu-link>svg:first-child{color:var(--gl-accent)}.gl-menu-link>svg:last-child{margin-left:auto;width:17px;color:var(--gl-muted)}.gl-menu-link span{font-size:16px;font-weight:570}.gl-menu-link small{display:block;color:var(--gl-muted);font-size:12px;font-weight:400;margin-top:3px}.gl-menu-classes{padding:18px 0}.gl-menu-classes p{font-size:12px;color:var(--gl-muted);margin:0 0 10px}.gl-menu-classes>div{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.gl-menu-classes a{border:1px solid var(--gl-line);border-radius:10px;min-height:44px;display:grid;place-items:center;font-size:13px}.gl-menu-classes a:hover{background:var(--gl-soft);color:var(--gl-accent)}.gl-menu-secondary{border-top:1px solid var(--gl-line);padding-top:12px;display:grid}.gl-menu-secondary a{display:flex;align-items:center;gap:12px;padding:12px 0;min-height:44px;font-size:14px;color:var(--gl-muted)}.gl-menu-secondary svg{width:18px}.gl-catalogue{padding:12px 32px 30px;min-height:calc(100dvh - 160px)}.gl-library{max-width:1060px;margin:auto}.gl-library-header{text-align:center;max-width:650px;margin:14px auto 24px}.gl-library-header .gl-eyebrow{justify-content:center}.gl-library-header h1{font-size:clamp(29px,4vw,43px);margin:0 0 12px}.gl-library-header>p:last-child{margin:0;color:var(--gl-muted);font-size:16px}.gl-discovery{max-width:660px;margin:0 auto 30px}.gl-search{display:flex;align-items:center;gap:12px;padding:0 16px;background:var(--gl-paper);border:1px solid var(--gl-line);border-radius:16px;box-shadow:0 4px 14px #63300d04}.gl-search>svg{color:var(--gl-muted)}.gl-search:focus-within{border-color:var(--gl-accent);box-shadow:0 0 0 3px var(--gl-soft)}.gl-search input{width:100%;min-width:0;min-height:54px;border:0;outline:none!important;background:transparent;color:var(--gl-ink);font:inherit;font-size:15px;box-shadow:none}.gl-search input::-webkit-search-cancel-button{display:none}.gl-search button{display:flex;align-items:center;justify-content:center;min-height:40px;min-width:32px;background:none;border:0;color:var(--gl-muted)}.gl-search input::placeholder{color:var(--gl-muted)}.gl-class-tabs{display:flex;align-items:center;justify-content:center;gap:6px;margin-top:14px}.gl-class-tabs>span{font-size:12px;color:var(--gl-muted);margin-right:8px}.gl-class-tabs a{border-radius:10px;min-width:44px;min-height:40px;display:flex;align-items:center;justify-content:center;padding:8px 13px;color:var(--gl-muted);font-size:14px;font-weight:550}.gl-class-tabs a[aria-current=page]{background:var(--gl-ink);color:var(--gl-paper)}.gl-class-tabs a:hover:not([aria-current]){background:var(--gl-panel)}.gl-section-heading{display:flex;gap:12px;justify-content:space-between;align-items:center;margin:0 0 14px}.gl-section-heading h2{font-size:19px;margin:0}.gl-section-heading>span{font-size:12px;color:var(--gl-muted)}.gl-book-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.gl-book-card{display:flex;align-items:center;gap:18px;position:relative;min-height:144px;padding:22px;background:var(--gl-paper);border:1px solid var(--gl-line);border-radius:20px;transition:border-color .15s,box-shadow .15s}.gl-book-card:hover{border-color:var(--gl-accent);box-shadow:0 6px 22px #63300d0a}.gl-book-card>div{flex:1;min-width:0}.gl-book-card .gl-eyebrow{color:var(--gl-muted);font-size:11px;letter-spacing:.055em;margin:0 0 7px}.gl-book-card h2{font-size:20px;margin:0 0 8px}.gl-book-card p:last-child{font-size:12px;color:var(--gl-muted);margin:0}.gl-card-chevron{width:17px!important;color:var(--gl-muted)}.gl-continue-card{display:flex;align-items:center;gap:18px;border:1px solid var(--gl-line);background:var(--gl-soft);border-radius:18px;padding:20px 24px;margin-bottom:28px}.gl-continue-icon{display:grid;place-items:center;width:42px;height:42px;background:var(--gl-paper);border-radius:12px;color:var(--gl-accent);flex-shrink:0}.gl-continue-card>div{flex:1;min-width:0}.gl-continue-card .gl-eyebrow{margin:0 0 4px;font-size:10px}.gl-continue-card h2{font-size:19px;margin:0 0 4px}.gl-continue-card p:last-child{margin:0;font-size:12px;color:var(--gl-muted)}.gl-continue-action{font-size:14px;font-weight:600;color:var(--gl-accent)}.gl-continue-action,.gl-library-legacy{display:flex;gap:10px;align-items:center}.gl-library-legacy{justify-content:center;border-top:1px solid var(--gl-line);padding:24px 0 0;margin-top:28px;font-size:12px;color:var(--gl-muted);flex-wrap:wrap}.gl-library-legacy>svg{width:16px;height:16px}.gl-library-legacy a{display:flex;align-items:center;gap:7px;color:var(--gl-accent);font-weight:550;min-height:36px}.gl-library-legacy a svg{width:15px}.gl-search-results{margin-top:28px}.gl-empty{text-align:center;padding:40px 20px}.gl-empty>svg{width:34px;height:34px;color:var(--gl-muted);margin:0 auto 14px}.gl-empty h1,.gl-empty h2{font-size:24px;margin:0 0 12px}.gl-empty p{color:var(--gl-muted);font-size:15px;max-width:400px;margin:0 auto 18px}.gl-empty>div{display:flex;justify-content:center;gap:12px}.gl-legacy{padding:20px;min-height:100dvh}.gl-breadcrumb{display:flex;align-items:center;gap:8px;min-height:44px;margin:0 0 26px;font-size:13px;color:var(--gl-muted);flex-wrap:wrap}.gl-breadcrumb a:hover{color:var(--gl-accent)}.gl-breadcrumb>svg{width:13px;height:13px}.gl-book-layout{display:grid;grid-template-columns:minmax(220px,.85fr) minmax(0,1.55fr);gap:44px;align-items:start}.gl-book-identity{padding:12px 12px 28px 0}.gl-book-identity .gl-book-symbol{width:72px;height:72px;border-radius:22px;margin-bottom:24px}.gl-book-identity .gl-book-symbol svg{width:32px;height:32px}.gl-book-identity h1{font-size:clamp(29px,3.6vw,39px);margin:0 0 18px}.gl-book-intro{font-size:16px;color:var(--gl-muted);line-height:1.65;margin:0 0 20px}.gl-book-meta{display:flex;gap:14px;flex-wrap:wrap;color:var(--gl-muted);font-size:12px;margin-bottom:22px}.gl-book-meta span{display:flex;gap:6px;align-items:center}.gl-book-meta svg{width:15px;height:15px}.gl-book-identity>.gl-text-button{font-size:12px}.gl-chapter-list{padding-top:12px}.gl-chapters{border:1px solid var(--gl-line);border-radius:20px;background:var(--gl-paper);overflow:hidden}.gl-chapter{display:flex;gap:16px;align-items:center;padding:22px;min-height:98px;border-bottom:1px solid var(--gl-line);transition:background .15s}.gl-chapter:last-child{border-bottom:0}.gl-chapter:hover{background:var(--gl-panel)}.gl-chapter-number{width:38px;height:38px;flex:0 0 38px;border-radius:12px;display:grid;place-items:center;background:var(--gl-panel);color:var(--gl-muted);font-size:13px;font-weight:550}.gl-chapter-number.is-done{background:var(--gl-good-bg);color:var(--gl-good)}.gl-chapter-body{min-width:0;flex:1}.gl-chapter h2{font-size:17px;margin:0 0 6px;line-height:1.35}.gl-chapter p{margin:0}.gl-chapter p,.gl-chapter-status{font-size:12px;color:var(--gl-muted)}.gl-chapter-status{display:flex;align-items:center;gap:6px}.gl-chapter-status svg{width:16px;height:16px}.gl-chapter.has-progress .gl-chapter-status{color:var(--gl-accent);font-weight:600}.gl-chapter-meter{height:3px;border-radius:9px;overflow:hidden;max-width:140px;margin-top:10px;background:var(--gl-line)}.gl-chapter-meter i{display:block;height:100%;background:var(--gl-accent)}.gl-reader{min-height:100dvh;--gl-header-height:108px}.gl-reader[data-screen=end],.gl-reader[data-screen=start]{--gl-header-height:72px}.gl-reader[data-size=large]{--gl-size:22px}.gl-reader[data-size=larger]{--gl-size:25px}.gl-reader-header{position:sticky;top:0;z-index:20;background:var(--gl-bg);padding-top:env(safe-area-inset-top)}.gl-header-inner{max-width:1000px;margin:auto;display:flex;align-items:center;gap:12px;padding:14px 20px}.gl-reader-identity{flex:1;min-width:0}.gl-reader-identity>span{display:block;font-size:10px;color:var(--gl-muted);margin-bottom:3px;letter-spacing:.02em}.gl-reader-identity>strong{display:block;white-space:nowrap;text-overflow:ellipsis;overflow:hidden;font-size:14px;font-weight:570}.gl-header-tool>span{font-size:12px;font-weight:550}.gl-reader-progress{max-width:748px;margin:0 auto;padding:0 0 12px}.gl-reader-progress>div:first-child{display:flex;justify-content:space-between;gap:12px;font-size:11px;color:var(--gl-muted);margin-bottom:7px}.gl-reader-progress>div:first-child>span:first-child{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.gl-reader-progress [role=progressbar]{height:4px;background:var(--gl-line);border-radius:4px;overflow:hidden}.gl-reader-progress i{display:block;height:100%;background:var(--gl-accent);border-radius:4px;transition:width .15s}.gl-page-number{font-variant-numeric:tabular-nums;white-space:nowrap}.gl-reader-main{width:100%;max-width:800px;margin:auto;min-height:calc(100dvh - var(--gl-header-height));padding:28px 24px calc(var(--gl-footer-height,88px) + 30px);display:flex;flex-direction:column;justify-content:center}.gl-reader[data-screen=end] .gl-reader-main,.gl-reader[data-screen=start] .gl-reader-main{padding-bottom:40px}.gl-reader[data-screen=review] .gl-reader-main{justify-content:flex-start}.gl-page{background:var(--gl-paper);border:1px solid var(--gl-line);border-radius:24px;padding:36px 40px;box-shadow:0 4px 20px #63300d04;min-height:330px}.gl-page>.gl-eyebrow{margin-bottom:18px;font-size:10px}.gl-page h1{font-size:clamp(25px,3vw,32px);margin:0 0 25px;letter-spacing:-.025em}.gl-paragraphs{display:grid;gap:24px}.gl-paragraphs p,.gl-question legend,.gl-review-feedback p{font-size:var(--gl-size);font-weight:400;line-height:1.72;color:var(--gl-text);margin:0;overflow-wrap:anywhere}.gl-paragraphs strong{color:var(--gl-ink);font-weight:650}.gl-definition h2,.gl-paragraph h2{font-size:17px;margin:0 0 10px}.gl-definition{padding:20px;background:var(--gl-soft);border-radius:14px}.gl-block-count{font-size:11px;color:var(--gl-muted);margin:24px 0 0}.gl-definition,.gl-paragraph{scroll-margin-top:130px}.gl-reader-footer{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);width:calc(100% - 48px);max-width:752px;z-index:25;padding:14px;background:var(--gl-paper);border:1px solid var(--gl-line);border-radius:20px;box-shadow:0 6px 28px #17213d0a;max-height:50dvh;overflow:auto}.gl-footer-actions{display:flex;gap:12px;align-items:center}.gl-footer-actions>.gl-primary{flex:1}.gl-footer-actions>.gl-secondary{border-color:transparent;background:var(--gl-panel)}.gl-skip{border:0;background:none;color:var(--gl-muted);min-width:44px;min-height:44px;font-size:13px!important}.gl-sync-alert{margin:12px 4px 0;font-size:12px;display:flex;gap:10px;color:var(--gl-muted)}.gl-sync-alert button{border:0;background:none;text-decoration:underline;white-space:nowrap;color:var(--gl-accent)}.gl-overview{text-align:center;max-width:610px;margin:auto;width:100%}.gl-overview>.gl-eyebrow{justify-content:center;margin:22px 0 12px}.gl-overview h1{font-size:clamp(32px,4.5vw,46px);margin:0 0 18px}.gl-lede{font-size:16px;color:var(--gl-muted);line-height:1.6;margin:0 0 20px}.gl-chapter-meta{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;color:var(--gl-muted);font-size:12px}.gl-chapter-meta span+span:before{content:"·";margin-right:10px}.gl-start-context{display:grid;gap:4px;background:var(--gl-paper);border:1px solid var(--gl-line);border-radius:16px;padding:18px;margin:26px auto 20px;max-width:400px}.gl-start-context>span{font-size:11px;color:var(--gl-muted)}.gl-start-context strong{font-size:15px;font-weight:550}.gl-start-context small{font-size:11px;color:var(--gl-muted)}.gl-start-button{width:100%;max-width:320px;min-height:54px}.gl-start>.gl-text-button{display:flex;justify-content:center;margin:8px auto 14px;width:max-content}.gl-start .gl-save-note{margin:0}.gl-question{border:0;padding:0;margin:0}.gl-question legend{width:100%;margin-bottom:24px}.gl-options{display:grid;gap:12px}.gl-option{display:flex;gap:13px;align-items:flex-start;text-align:left;padding:17px;border-radius:14px;border:1.5px solid var(--gl-line);background:var(--gl-paper);color:var(--gl-text);font-size:calc(var(--gl-size) - 2px)!important;line-height:1.55;transition:border-color .12s,background .12s}.gl-option:hover:not([aria-disabled=true]){border-color:var(--gl-accent)}.gl-option-key{flex:0 0 26px;width:26px;height:26px;display:grid;place-items:center;border:1px solid var(--gl-line);border-radius:50%;color:var(--gl-muted);font-size:11px;margin-top:1px}.gl-option-key svg{width:15px;height:15px}.gl-option.is-selected{border-color:var(--gl-accent);background:var(--gl-soft);color:var(--gl-ink)}.gl-option.is-selected .gl-option-key{border-color:var(--gl-accent);color:var(--gl-accent)}.gl-option.is-correct{border-color:var(--gl-good);background:var(--gl-good-bg)}.gl-option.is-wrong{border-color:var(--gl-wrong);background:var(--gl-wrong-bg)}.gl-option.is-dim{opacity:.75}.gl-answer-label{display:block;font-size:11px;font-weight:550;margin-top:5px}.gl-feedback{padding:18px;border-radius:14px;margin-top:20px;background:var(--gl-panel);color:var(--gl-text)}.gl-feedback.is-correct{background:var(--gl-good-bg)}.gl-feedback strong{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:600;color:var(--gl-ink)}.gl-feedback.is-correct strong{color:var(--gl-good)}.gl-feedback p{font-size:calc(var(--gl-size) - 2px);line-height:1.65;margin:10px 0 0}.gl-retry-answer{font-size:12px;margin-top:6px}.gl-retry-answer svg{width:14px}.gl-review-feedback{margin-top:22px;padding:20px;border-radius:14px;background:var(--gl-panel)}.gl-review-feedback h2{font-size:17px;margin:0 0 12px}.gl-browse{padding:10px 20px;font-size:12px;color:var(--gl-muted);display:flex;justify-content:center;gap:12px;align-items:center;flex-wrap:wrap}.gl-browse button{border:0;background:var(--gl-soft);border-radius:8px;padding:6px 10px;color:var(--gl-accent);font-size:12px;min-height:34px}.gl-completion-mark{width:68px;height:68px;border-radius:22px;display:inline-grid;place-items:center;background:var(--gl-good-bg);color:var(--gl-good)}.gl-completion-mark svg{width:32px;height:32px}.gl-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:22px 0;margin:22px 0;border-top:1px solid var(--gl-line);border-bottom:1px solid var(--gl-line)}.gl-stats span{font-size:11px;color:var(--gl-muted)}.gl-stats strong{font-size:25px;font-weight:650;color:var(--gl-ink);display:block;margin-bottom:3px}.gl-stats strong small{font-size:13px;font-weight:400;color:var(--gl-muted)}.gl-next-chapter{display:flex;gap:20px;align-items:center;text-align:left;padding:24px;background:var(--gl-soft);border:1px solid var(--gl-line);border-radius:18px;margin:20px 0}.gl-next-chapter>span{flex:1}.gl-next-chapter .gl-eyebrow{display:block;margin:0 0 7px;font-size:10px}.gl-next-chapter strong{display:block;font-size:21px;font-weight:600}.gl-next-chapter>svg{color:var(--gl-accent)}.gl-summary-actions{display:flex;gap:12px;margin:18px 0}.gl-summary-actions>*{flex:1}.gl-revisit{margin:24px 0;text-align:left;border:1px solid var(--gl-line);border-radius:16px;background:var(--gl-paper);padding:0 18px}.gl-revisit summary{display:flex;align-items:center;gap:10px;list-style:none;cursor:pointer;padding:17px 0;font-size:15px;font-weight:550}.gl-revisit summary>span{flex:1}.gl-revisit summary small{display:block;color:var(--gl-muted);font-size:12px;margin-top:3px;font-weight:400}.gl-revisit button{display:flex;width:100%;gap:16px;justify-content:space-between;text-align:left;border:0;border-top:1px solid var(--gl-line);padding:15px 0;background:none;color:var(--gl-text);font-size:14px}.gl-revisit svg{width:16px}.gl-end .gl-save-note{margin-top:24px}.gl-dialog{position:fixed;inset:0;margin:auto;width:calc(100% - 40px);max-width:500px;max-height:85dvh;padding:28px;border:1px solid var(--gl-line);border-radius:24px;background:var(--gl-paper);color:var(--gl-ink);overflow-y:auto;overscroll-behavior:contain;box-shadow:0 24px 90px #28170b33}.gl-dialog::backdrop{background:#28170b66;backdrop-filter:blur(2px)}.gl-dialog>header{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:22px}.gl-dialog>header h2{font-size:23px;margin:8px 0 0}.gl-dialog>header .gl-icon-button{margin-right:-9px}.gl-dialog-contents{max-width:470px;margin:18px 18px 18px auto;height:calc(100dvh - 36px);max-height:none;inset:0}.gl-contents-bookmark{width:100%;display:flex;gap:12px;align-items:center;border:1px solid var(--gl-line);border-radius:14px;background:var(--gl-soft);color:var(--gl-accent);text-align:left;padding:16px;margin:18px 0}.gl-contents-bookmark>span{flex:1}.gl-contents-bookmark small{font-size:10px;display:block;color:var(--gl-muted);margin-bottom:5px}.gl-contents-bookmark strong{font-size:14px;font-weight:550;display:block;color:var(--gl-ink)}.gl-contents-bookmark>svg{width:18px}.gl-contents details{border-bottom:1px solid var(--gl-line);padding:8px 0}.gl-contents summary{display:flex;align-items:center;gap:12px;font-size:14px;font-weight:550;padding:12px 0;cursor:pointer;min-height:48px;list-style:none}.gl-contents summary::-webkit-details-marker,.gl-revisit summary::-webkit-details-marker{display:none}.gl-section-number{font-size:11px;color:var(--gl-muted);min-width:26px}.gl-contents summary>span:nth-child(2){flex:1}.gl-contents summary small{display:block;font-size:10px;color:var(--gl-muted);font-weight:400;margin-top:4px}.gl-contents summary>svg{width:15px;color:var(--gl-muted)}.gl-contents details[open]>summary>svg,.gl-revisit[open]>summary>svg{transform:rotate(180deg)}.gl-contents button{display:flex;gap:12px;width:100%;padding:12px 10px;text-align:left;color:var(--gl-text);border:0;background:none;border-radius:10px;font-size:13px;align-items:center;margin:2px 0}.gl-contents button[aria-current=page]{background:var(--gl-soft);color:var(--gl-accent)}.gl-contents button>span:nth-child(2){flex:1}.gl-contents button>span:first-child{width:20px;font-size:10px;color:var(--gl-muted)}.gl-contents button small{display:block;font-size:10px;color:var(--gl-muted);margin-top:4px}.gl-contents button svg{width:15px;height:15px}.gl-dialog-links{display:flex;flex-direction:column;margin-top:16px;align-items:flex-start}.gl-settings-group{border:0;padding:0;margin:26px 0}.gl-settings-group legend{font-size:12px;font-weight:550;margin-bottom:12px;color:var(--gl-muted)}.gl-settings-group>div{display:flex;gap:10px}.gl-settings-group button{flex:1;min-width:0;border:1px solid var(--gl-line);padding:15px 8px;border-radius:13px;background:var(--gl-paper);color:var(--gl-text);font-size:12px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:9px;min-height:80px}.gl-settings-group button[aria-pressed=true]{border-color:var(--gl-accent);color:var(--gl-accent);background:var(--gl-soft)}.gl-type-preview{font-size:22px;line-height:1;height:28px;display:flex;align-items:center}.gl-type-large{font-size:25px}.gl-type-larger{font-size:29px}.gl-sources section{padding:18px 0;border-top:1px solid var(--gl-line);font-size:14px}.gl-sources a{color:var(--gl-accent);font-weight:550;text-decoration:underline}.gl-sources p{margin:10px 0;color:var(--gl-text)}.gl-state{min-height:70dvh;display:grid;place-items:center;padding:32px}.gl-state-card{text-align:center;max-width:450px;margin:auto}.gl-state-card>.gl-eyebrow{justify-content:center;margin-top:24px}.gl-state-card h1{font-size:32px;margin:0 0 16px}.gl-state-card>p:not(.gl-eyebrow){font-size:15px;color:var(--gl-muted);margin:0 0 24px}.gl-state-card>.gl-text-button{display:flex;justify-content:center;margin:8px auto}.gl-skeleton{min-height:calc(100dvh - 150px);padding:28px 32px}.gl-skeleton-inner{max-width:1060px;margin:auto}.gl-skeleton-heading{max-width:650px;margin:0 auto 24px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:14px}.gl-skeleton i,.gl-skeleton-books>div>span,.gl-skeleton-search{display:block;background:var(--gl-line);border-radius:7px;animation:gl-pulse 1.4s ease-in-out infinite}.gl-skeleton-heading>i:first-of-type{width:70%;height:34px}.gl-skeleton-heading>i:last-child{width:80%;height:15px}.gl-skeleton-library .gl-identity-mark{width:28px;height:28px;background:transparent}.gl-skeleton-library .gl-identity-mark svg{width:22px;height:22px}.gl-skeleton-search{max-width:660px;height:54px;margin:0 auto 16px;opacity:.55}.gl-skeleton-filters{display:flex;justify-content:center;gap:10px;margin:0 0 38px}.gl-skeleton-filters i{height:32px;width:45px}.gl-skeleton-books{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.gl-skeleton-books>div{display:flex;gap:18px;padding:24px;min-height:144px;background:var(--gl-paper);border:1px solid var(--gl-line);border-radius:20px;align-items:center}.gl-skeleton-books>div>span{width:56px;height:56px;border-radius:18px}.gl-skeleton-books>div>div{flex:1}.gl-skeleton-books i{height:13px;margin-bottom:11px}.gl-skeleton-books i:nth-child(2){width:85%;height:20px}.gl-skeleton-books i:last-child{width:40%;margin:0}.gl-skeleton-reader{min-height:100dvh}.gl-skeleton-reader .gl-skeleton-inner{max-width:752px}.gl-skeleton-toolbar{display:flex;gap:14px;margin:0 0 70px}.gl-skeleton-toolbar i{width:36px;height:36px}.gl-skeleton-toolbar i:nth-child(2){flex:1;max-width:400px;margin-right:auto}.gl-skeleton-paper{padding:40px;border:1px solid var(--gl-line);background:var(--gl-paper);border-radius:24px;margin:30px 0}.gl-skeleton-paper i{height:16px;margin-bottom:22px}.gl-skeleton-paper i:first-child{height:28px;width:65%;margin-bottom:35px}.gl-skeleton-paper i:last-child{width:68%}.gl-skeleton-actions{display:flex;gap:12px;margin:24px 0}.gl-skeleton-actions i{height:52px;width:80px}.gl-skeleton-actions i:last-child{flex:1}@keyframes gl-pulse{50%{opacity:.4}}@media(min-width:801px){.lessons-app-shell .app-shell-bottom-nav{bottom:14px;max-width:660px;box-shadow:0 6px 26px #63300d12;border-radius:20px;overflow:hidden;border:1px solid var(--gl-line)}.lessons-app-shell .bottom-nav-contrast-scope{border-top:0}.gl-library-header{margin-top:24px}.gl-book-grid .gl-book-card:last-child:nth-child(odd),.gl-skeleton-books>div:last-child:nth-child(odd){grid-column:1/-1;min-height:116px}.gl-book-layout{margin-top:10px}}@media(max-width:800px){.gl-catalogue{padding:12px 24px 24px}.gl-book-layout{grid-template-columns:1fr;gap:22px}.gl-book-identity{padding:0;display:grid;grid-template-columns:64px 1fr;column-gap:18px;align-items:start}.gl-book-identity .gl-book-symbol{grid-row:1/4;width:64px;height:64px;margin:0}.gl-book-identity>.gl-eyebrow{margin:0 0 9px}.gl-book-identity h1{font-size:29px;margin:0 0 10px}.gl-book-intro{display:none}.gl-book-meta{grid-column:2;margin:0}.gl-book-identity>.gl-text-button{display:none}.gl-chapter-list{padding:0}.gl-breadcrumb{margin-bottom:22px}.gl-reader-progress{margin:0 24px}.gl-header-tool>span{display:none}.gl-reader-main{padding-top:20px;padding-bottom:calc(var(--gl-footer-height,88px) + 24px)}.gl-page{padding:30px;min-height:340px}.gl-dialog-contents{margin:auto;width:calc(100% - 32px);height:auto;max-height:88dvh}}@media(max-width:600px){.gl-library-bar{height:60px;padding:8px 16px}.gl-catalogue{padding:10px 20px 20px}.gl-library-header{margin:12px auto 22px}.gl-library-header h1{font-size:31px;margin-bottom:10px}.gl-library-header>p:last-child{font-size:14px;max-width:290px;margin:0 auto}.gl-library-header .gl-eyebrow{font-size:10px;margin-bottom:10px}.gl-discovery{margin-bottom:26px}.gl-search{border-radius:14px;padding:0 14px;gap:10px}.gl-search input{min-height:50px;font-size:14px}.gl-class-tabs{margin-top:10px;gap:4px}.gl-class-tabs a{min-height:38px;padding:8px 11px;min-width:42px}.gl-book-grid{grid-template-columns:1fr;gap:11px}.gl-book-card{padding:17px;gap:14px;min-height:115px;border-radius:17px}.gl-book-card .gl-book-symbol{width:48px;height:56px;border-radius:14px}.gl-book-card .gl-book-symbol svg{width:23px;height:23px}.gl-book-card h2{font-size:17px;line-height:1.35;margin-bottom:6px}.gl-book-card .gl-eyebrow{font-size:10px;margin-bottom:5px;letter-spacing:.04em}.gl-book-card p:last-child{font-size:11px}.gl-card-chevron{width:14px!important}.gl-section-heading h2{font-size:17px}.gl-section-heading>span{font-size:11px}.gl-continue-card{padding:17px;gap:12px;margin-bottom:25px}.gl-continue-card h2{font-size:16px}.gl-continue-card .gl-eyebrow{font-size:9px}.gl-continue-action{font-size:0;gap:0}.gl-continue-icon{width:35px;height:40px}.gl-library-legacy{font-size:11px;gap:6px}.gl-chapter{padding:18px 16px;gap:12px;min-height:94px}.gl-chapter h2{font-size:16px}.gl-chapter-number{width:32px;height:32px;flex-basis:32px;font-size:11px}.gl-chapter-status{font-size:11px;gap:2px}.gl-chapter-status>span{display:none}.gl-chapter.has-progress .gl-chapter-status>span{display:inline}.gl-chapter p{font-size:11px}.gl-book-identity h1{font-size:26px}.gl-breadcrumb{font-size:12px;margin-bottom:20px}.gl-reader{--gl-header-height:106px}.gl-reader[data-screen=end],.gl-reader[data-screen=start]{--gl-header-height:62px}.gl-header-inner{gap:4px;padding:9px 12px}.gl-reader-identity{padding:0 5px}.gl-reader-identity>strong{font-size:12px}.gl-reader-identity>span{font-size:9px}.gl-reader-progress{margin:0 20px;padding-bottom:12px}.gl-reader-progress>div:first-child{font-size:10px}.gl-section-name{display:none}.gl-reader-main{padding:18px 16px calc(var(--gl-footer-height,80px) + 24px)}.gl-page{padding:27px 24px;min-height:365px;border-radius:21px}.gl-page h1{font-size:26px;margin-bottom:22px}.gl-page>.gl-eyebrow{margin-bottom:15px;font-size:9px}.gl-paragraphs p,.gl-question legend{line-height:1.7}.gl-overview h1{font-size:34px}.gl-overview{padding:6px 8px}.gl-overview>.gl-eyebrow{font-size:10px}.gl-overview .gl-lede{font-size:15px;max-width:300px;margin:0 auto 18px}.gl-chapter-meta{font-size:11px;gap:7px}.gl-chapter-meta span+span:before{margin-right:7px}.gl-start-context{margin-top:24px}.gl-reader-footer{bottom:0;left:0;transform:none;width:100%;max-width:none;border-radius:0;border-left:0;border-right:0;border-bottom:0;padding:12px 20px calc(12px + env(safe-area-inset-bottom));box-shadow:none}.gl-footer-actions{gap:9px}.gl-button{padding:12px 16px;font-size:14px!important;min-height:50px}.gl-footer-actions>.gl-secondary{padding:12px}.gl-footer-actions>.gl-secondary>span{display:none}.gl-option{padding:15px;gap:11px}.gl-feedback{padding:16px}.gl-browse{gap:6px;padding:8px 16px}.gl-browse,.gl-browse button{font-size:11px}.gl-stats{gap:6px}.gl-stats strong{font-size:23px}.gl-stats span{font-size:10px}.gl-summary-actions{gap:10px;flex-wrap:wrap}.gl-summary-actions .gl-button{font-size:12px!important;padding:12px}.gl-next-chapter{padding:20px}.gl-next-chapter strong{font-size:19px}.gl-dialog,.gl-dialog-contents{margin:auto 0 0;width:100%;max-width:none;max-height:88dvh;inset:auto 0 0;border-radius:24px 24px 0 0;padding:24px 24px calc(24px + env(safe-area-inset-bottom));height:auto}.gl-dialog:before{content:"";display:block;background:var(--gl-line);width:34px;height:4px;border-radius:6px;margin:-10px auto 18px}.gl-dialog>header h2,.gl-library-menu header h2{font-size:22px}.gl-dialog>header{margin-bottom:18px}.gl-skeleton{padding:24px 20px}.gl-skeleton-heading{gap:13px}.gl-skeleton-heading>i:first-of-type{height:28px;width:85%}.gl-skeleton-heading>i:last-child{width:90%}.gl-skeleton-books{grid-template-columns:1fr;gap:11px}.gl-skeleton-books>div{padding:18px;min-height:115px;border-radius:17px}.gl-skeleton-toolbar{margin-bottom:50px}.gl-skeleton-paper,.gl-state{padding:28px 24px}.gl-state{min-height:65dvh}.gl-state-card h1{font-size:29px}}@media(max-width:360px){.gl-catalogue{padding-left:16px;padding-right:16px}.gl-library-header h1{font-size:28px}.gl-class-tabs a{min-width:38px;padding:7px 10px}.gl-book-card{gap:11px;padding:15px}.gl-book-card .gl-book-symbol{width:40px;height:48px}.gl-book-card h2{font-size:16px}.gl-card-chevron{display:none}.gl-page{padding:24px 20px}.gl-page h1{font-size:24px}.gl-chapter{padding:17px 13px;gap:10px}.gl-overview h1{font-size:30px}.gl-settings-group>div{gap:7px}}@media(prefers-reduced-motion:reduce){.guided-shell *{animation:none!important;transition:none!important;scroll-behavior:auto!important}}.gl-feedback,.gl-review-feedback{scroll-margin-bottom:calc(var(--gl-footer-height,88px) + 24px);scroll-margin-top:calc(var(--gl-header-height,100px) + 24px)}.gl-start{max-width:630px;margin:0 auto}.gl-start .gl-identity-mark{background:var(--gl-cta);color:var(--gl-on-cta);border-radius:20px;box-shadow:0 4px 0 color-mix(in srgb,var(--gl-cta) 65%,#a83e00)}.gl-orientation-context{font-size:16px;line-height:1.65;color:var(--gl-text);margin:0 0 18px;text-wrap:pretty}.gl-return-context{text-align:left;max-width:560px;margin:0 auto 24px}.gl-start>.gl-identity-mark{margin-bottom:20px}.gl-start h1{font-size:38px;margin-bottom:24px}.gl-catalogue-scope{font-size:13px;color:var(--gl-muted);margin:12px auto}.gl-introduction{border:1px solid var(--gl-line);background:var(--gl-paper);border-radius:20px;padding:24px;text-align:left;margin:24px 0}.gl-intro-lead{font-size:17px;line-height:1.65;color:var(--gl-text);margin:0 0 22px}.gl-introduction h2{font-size:16px;line-height:1.4;margin:0 0 15px}.gl-introduction ul{list-style:none;padding:0;margin:0;display:grid;gap:13px}.gl-introduction li{position:relative;padding-left:20px;font-size:15px;line-height:1.55;color:var(--gl-text)}.gl-introduction li:before{content:"";position:absolute;width:7px;height:7px;border-radius:50%;left:0;top:.55em;background:var(--gl-accent)}.gl-return-intro{padding:0 24px;margin-top:22px}.gl-return-intro summary{display:flex;align-items:center;justify-content:space-between;list-style:none;cursor:pointer;min-height:58px;font-size:15px;font-weight:550;color:var(--gl-ink);gap:12px}.gl-return-intro summary::-webkit-details-marker{display:none}.gl-return-intro[open]{padding-bottom:24px}.gl-return-intro[open] summary{margin-bottom:12px}.gl-return-intro[open] summary svg{transform:rotate(180deg)}.gl-return-intro summary svg{width:17px}.gl-start .gl-start-context{margin:18px auto 16px;padding:14px 18px;background:var(--gl-panel);border:0}.gl-start .gl-start-button{max-width:400px;box-shadow:0 4px 0 color-mix(in srgb,var(--gl-cta) 65%,#a83e00)}.gl-start .gl-chapter-meta{margin:24px 0 8px}.gl-start .gl-save-note{margin-top:13px}.gl-primary{box-shadow:0 3px 0 color-mix(in srgb,var(--gl-cta) 65%,#a83e00)}.gl-primary:hover:not(:disabled){background:color-mix(in srgb,var(--gl-cta) 90%,#fff);box-shadow:0 3px 0 color-mix(in srgb,var(--gl-cta) 60%,#a83e00)}.gl-book-card{border-top:3px solid var(--gl-soft)}.gl-book-symbol{color:var(--gl-accent)}.gl-book-symbol,.gl-reader-progress [role=progressbar]{background:var(--gl-soft)}@media(max-width:600px){.gl-start{padding:4px}.gl-start h1{font-size:30px;margin-bottom:20px}.gl-orientation-context{font-size:15px}.gl-start .gl-identity-mark{width:48px;height:48px;border-radius:16px;margin-bottom:20px}.gl-introduction{padding:21px 20px;margin:21px 0}.gl-intro-lead{font-size:16px;margin-bottom:19px}.gl-introduction h2,.gl-introduction li{font-size:15px}.gl-return-intro{padding:0 20px}.gl-return-intro[open]{padding-bottom:20px}.gl-start .gl-chapter-meta{font-size:11px;flex-wrap:wrap}.gl-start .gl-start-button{width:100%}}.gl-inline-activity{margin-top:30px;padding:22px;border:1px solid var(--gl-line);border-radius:18px;background:var(--gl-panel);text-align:left}.gl-activity-label{font-size:12px!important;font-weight:650;color:var(--gl-accent);margin:0 0 12px!important;line-height:1.4!important}.gl-inline-activity h2{font-size:calc(var(--gl-size) - 1px);font-weight:550;line-height:1.6;margin:0 0 18px}.gl-activity-options{display:grid;gap:10px}.gl-activity-binary{grid-template-columns:1fr 1fr}.gl-activity-options button{display:flex;flex-direction:column;align-items:flex-start;gap:6px;text-align:left;min-height:50px;background:var(--gl-paper);color:var(--gl-text);border:1.5px solid var(--gl-line);border-radius:12px;padding:13px 15px;font-size:calc(var(--gl-size) - 2px);line-height:1.5}.gl-activity-binary button{align-items:center;text-align:center}.gl-activity-options button:hover:not([aria-disabled=true]),.gl-match-grid button:hover:not(:disabled){border-color:var(--gl-accent)}.gl-activity-options button.is-correct{border-color:var(--gl-good);background:var(--gl-good-bg)}.gl-activity-options button.is-wrong{border-color:var(--gl-wrong);background:var(--gl-wrong-bg)}.gl-activity-options small{font-size:12px;font-weight:600}.gl-activity-feedback{border-top:1px solid var(--gl-line);padding-top:17px;margin-top:19px}.gl-activity-feedback strong{font-size:15px;line-height:1.5}.gl-activity-feedback p{font-size:calc(var(--gl-size) - 2px);line-height:1.65;margin:8px 0 0}.gl-activity-reveal{margin-top:12px!important;font-size:14px!important}.gl-activity-reveal svg{width:16px;height:16px}.gl-match-instruction,.gl-match-message{font-size:13px!important;line-height:1.5!important;color:var(--gl-muted);margin:8px 0 15px!important}.gl-match-message{min-height:20px;margin:12px 0 0!important}.gl-match-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.gl-match-grid>div{display:grid;gap:10px;align-content:start}.gl-match-grid button{background:var(--gl-paper);color:var(--gl-text);border:1.5px solid var(--gl-line);padding:12px;min-height:64px;border-radius:12px;text-align:left;line-height:1.45;font-size:calc(var(--gl-size) - 3px);overflow-wrap:anywhere}.gl-match-grid button.is-selected{border-color:var(--gl-accent);outline:2px solid var(--gl-accent);outline-offset:1px}.gl-match-grid button.is-matched{border-color:var(--gl-good);background:var(--gl-good-bg);opacity:1}.gl-match-grid button span{display:flex;gap:4px;align-items:center;font-size:11px;font-weight:600;margin-top:8px}.gl-match-grid button svg{width:14px;height:14px}.gl-matched-pairs{display:grid;gap:12px;margin:0}.gl-matched-pairs>div{background:var(--gl-paper);border:1px solid var(--gl-line);border-radius:12px;padding:13px}.gl-matched-pairs dt{font-size:calc(var(--gl-size) - 2px);font-weight:600;line-height:1.5}.gl-matched-pairs dd{font-size:calc(var(--gl-size) - 2px);line-height:1.55;margin:5px 0 0;color:var(--gl-text)}@media(max-width:600px){.gl-inline-activity{margin-top:24px;padding:18px 14px}.gl-match-grid{gap:10px}.gl-match-grid button{padding:10px;font-size:calc(var(--gl-size) - 3px)}.gl-activity-options button{padding:12px}}.gl-match-group-label{display:none;font-size:13px!important;font-weight:600;line-height:1.5!important;margin:0 0 3px!important;color:var(--gl-muted)}@media(max-width:600px){.gl-reader[data-size=large] .gl-match-grid,.gl-reader[data-size=larger] .gl-match-grid{grid-template-columns:1fr;gap:22px}.gl-reader[data-size=large] .gl-match-group-label,.gl-reader[data-size=larger] .gl-match-group-label{display:block}.gl-reader[data-size=large] .gl-match-grid button,.gl-reader[data-size=larger] .gl-match-grid button{overflow-wrap:break-word}}@media(max-width:360px){.gl-match-grid{grid-template-columns:1fr;gap:22px}.gl-match-group-label{display:block}.gl-match-grid button{overflow-wrap:break-word}}html[data-lessons-surface=shelf],html[data-lessons-surface=shelf] body{background:#24150b}html[data-lessons-surface=book],html[data-lessons-surface=book] body,html[data-lessons-surface=reader],html[data-lessons-surface=reader] body{background:#f1f4f9}html.dark[data-lessons-surface=book],html.dark[data-lessons-surface=book] body,html[data-lessons-surface=reader]:has(.gl-reader[data-theme=dark]),html[data-lessons-surface=reader]:has(.gl-reader[data-theme=dark]) body{background:#10181c}html[data-lessons-surface=shelf] .lessons-app-shell{background:#24150b;isolation:isolate}html[data-lessons-surface=shelf] .lessons-app-shell:before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(130% 60% at 50% 0,rgb(255 210 140/.12),transparent 62%),linear-gradient(rgb(28 14 5/.6),rgb(28 14 5/.44) 45%,rgb(28 14 5/.64)),url(/images/lesson-library/walnut.webp) 50%/cover #4a2d18}html[data-lessons-surface=shelf] .lessons-app-shell .app-shell-column{background:transparent;box-shadow:none}html[data-lessons-surface=shelf] .gl-navigation{background:rgb(32 18 8/.9);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);box-shadow:inset 0 -1px rgb(233 190 125/.3),0 10px 20px -14px rgb(0 0 0/.7)}html[data-lessons-surface=shelf] .gl-navigation .gl-icon-button{color:#f3dcb6}html[data-lessons-surface=shelf] .gl-navigation .gl-icon-button:hover{background:rgb(255 232 196/.13);color:#fff3dc}html[data-lessons-surface=shelf] .gl-navigation :focus-visible{outline-color:#f3d08e}html[data-lessons-surface=shelf] .gl-library-brand{color:#fbecd4;text-shadow:0 1px 2px rgb(0 0 0/.45)}html[data-lessons-surface=shelf] .gl-library-brand svg{color:#e7bf7d}html[data-lessons-surface=shelf] .lessons-app-shell .bottom-nav-contrast-scope{--small-muted-aa:#e8d2ad;--small-accent-aa:#3a2415;background:rgb(34 20 10/.96);border-color:rgb(233 190 125/.3);box-shadow:0 -10px 22px -14px rgb(0 0 0/.7)}html[data-lessons-surface=shelf] .lessons-app-shell .bottom-nav-contrast-scope [aria-current=page]{background:linear-gradient(115deg,#d3ad67,#edd6a1 45%,#bd934e);box-shadow:0 2px 4px rgb(10 4 0/.45),inset 0 0 0 1px rgb(134 97 55/.55)}html[data-lessons-surface=shelf] .lessons-app-shell .app-shell-bottom-nav{border-color:rgb(233 190 125/.3);box-shadow:0 12px 30px rgb(0 0 0/.45)}html[data-lessons-surface=shelf] .gl-skeleton-library{background:transparent}html[data-lessons-surface=shelf] .gl-skeleton-library .gl-identity-mark{color:#e7bf7d}html[data-lessons-surface=shelf] .gl-skeleton-books>div>span,html[data-lessons-surface=shelf] .gl-skeleton-library i,html[data-lessons-surface=shelf] .gl-skeleton-search{background:rgb(247 231 201/.16)}html[data-lessons-surface=shelf] .gl-skeleton-books>div{background:rgb(22 11 4/.35);border-color:rgb(233 190 125/.22)}html[data-lessons-surface=shelf] .gl-state{background:transparent;--gl-ink:#fbecd4;--gl-muted:#e8d2ad;--gl-accent:#f0c987;--gl-soft:rgb(22 11 4/.4)}html[data-lessons-surface=book] .lessons-app-shell{background:linear-gradient(rgb(241 244 249/0) 72px,rgb(241 244 249/.45) 300px,rgb(241 244 249/.88) 440px,#f1f4f9 540px),linear-gradient(90deg,#ccede8,#d8ebd8 50%,#e3e9c2);background-color:#f1f4f9}html.dark[data-lessons-surface=book] .lessons-app-shell{background:linear-gradient(rgb(16 24 28/0) 72px,rgb(16 24 28/.45) 300px,rgb(16 24 28/.88) 440px,#10181c 540px),linear-gradient(90deg,#0c3130,#123029 50%,#212f17);background-color:#10181c}html[data-lessons-surface=book] .lessons-app-shell .app-shell-column,html[data-lessons-surface=book] [data-view=book]{background:transparent;box-shadow:none}html[data-lessons-surface=book] .gl-navigation.guided-shell{background:linear-gradient(90deg,#ccede8,#d8ebd8 50%,#e3e9c2) fixed;--gl-ink:#16232a;--gl-text:#2b373d;--gl-accent:#377808;--gl-panel:rgb(255 255 255/.55)}html.dark[data-lessons-surface=book] .gl-navigation.guided-shell{background:linear-gradient(90deg,#0c3130,#123029 50%,#212f17) fixed;--gl-ink:#eef4f6;--gl-text:#d2dde1;--gl-accent:#a8dc72;--gl-panel:rgb(255 255 255/.08)}html[data-lessons-surface=book] .gl-library-brand{font-family:var(--font-inter),system-ui,sans-serif}html[data-lessons-surface=book] .lessons-app-shell .bottom-nav-contrast-scope{--small-muted-aa:#56666e;--small-accent-aa:#2f6b06;background:#fff;border-color:#d5dee4}html[data-lessons-surface=book] .lessons-app-shell .bottom-nav-contrast-scope [aria-current=page]{background:#e3f3d2}html[data-lessons-surface=book] .lessons-app-shell .app-shell-bottom-nav{border-color:#d5dee4;box-shadow:0 8px 26px rgb(22 35 42/.12)}html.dark[data-lessons-surface=book] .lessons-app-shell .bottom-nav-contrast-scope{--small-muted-aa:#9daeb5;--small-accent-aa:#a8dc72;background:#1a252b;border-color:#31424b}html.dark[data-lessons-surface=book] .lessons-app-shell .bottom-nav-contrast-scope [aria-current=page]{background:#23391c}html.dark[data-lessons-surface=book] .lessons-app-shell .app-shell-bottom-nav{border-color:#31424b}html[data-lessons-surface=book] .gl-skeleton-library{background:transparent;--gl-line:rgb(22 35 42/.09);--gl-paper:#fff;--gl-accent:#377808}html.dark[data-lessons-surface=book] .gl-skeleton-library{--gl-line:rgb(238 244 246/.1);--gl-paper:#1a252b;--gl-accent:#a8dc72}.gl-skeleton-reader{--gl-line:rgb(22 35 42/.09);--gl-paper:#fff;background:linear-gradient(rgb(241 244 249/0),#f1f4f9 420px),linear-gradient(90deg,#ccede8,#d8ebd8 50%,#e3e9c2);background-color:#f1f4f9;font-family:var(--font-inter),system-ui,sans-serif}.dark .gl-skeleton-reader{--gl-line:rgb(238 244 246/.1);--gl-paper:#1a252b;background:linear-gradient(rgb(16 24 28/0),#10181c 420px),linear-gradient(90deg,#0c3130,#123029 50%,#212f17);background-color:#10181c}.gl-skeleton-reader .gl-skeleton-inner{max-width:688px}.gl-skeleton-reader .gl-skeleton-heading{align-items:flex-start;text-align:left}.gl-skeleton-reader .gl-skeleton-heading .gl-identity-mark{display:none}.gl-skeleton-reader .gl-skeleton-toolbar{margin-bottom:36px}.gl-skeleton-reader .gl-skeleton-paper{padding:0;border:0;background:transparent;margin:18px 0}.gl-skeleton-reader .gl-skeleton-actions i:first-child{display:none}.gl-skeleton-reader .gl-skeleton-actions i{border-radius:16px}@property --wash-a{syntax:"<color>";inherits:true;initial-value:#ccede8}@property --wash-b{syntax:"<color>";inherits:true;initial-value:#d8ebd8}@property --wash-c{syntax:"<color>";inherits:true;initial-value:#e3e9c2}@property --wash-d{syntax:"<color>";inherits:true;initial-value:#d7e7f4}