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.pdf-stage{overflow-y:scroll;scrollbar-gutter:stable}
@keyframes spin{to{transform:rotate(360deg)}}@keyframes shimmer{to{background-position:-200% 0}}@media(min-width:1600px){.main{padding-right:60px;padding-left:60px}.audio-dock{left:calc(var(--sidebar) + 60px);right:60px}.pdf-stage{height:calc(100vh - 320px)}}
@media(max-width:1200px){:root{--sidebar:248px}.site-header{padding:0 25px}.brand{min-width:220px}.brand-name{font-size:23px}.brand-name>span{font-size:13px}.nav-button{padding:10px 17px}.header-meta{font-size:10px}.main{padding:28px}.heading-note{display:none}.reader-toolbar{padding:9px 14px}.reader-location{gap:7px}.reader-location #reader-book-title{max-width:130px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.reader-tools{gap:6px}.pdf-stage{padding:20px}.basics-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.vocab-row,.vocab-table-head{grid-template-columns:minmax(190px,.9fr) minmax(200px,1.2fr);gap:18px;padding-left:18px;padding-right:18px}.sentence-cell{padding-left:15px}.audio-dock{left:calc(var(--sidebar) + 28px);right:28px;gap:10px}.audio-info{max-width:170px}.audio-cover{display:none}}
@media(max-width:960px){:root{--sidebar:222px;--header:80px}.site-header{padding:0 20px}.brand{min-width:190px;gap:9px}.brand-icon{width:35px;height:39px}.brand-name{font-size:22px}.brand-name>span{font-size:11px;letter-spacing:.5px}.brand-name small{font-size:6px;letter-spacing:1.5px}.header-meta{display:none}.main-nav{left:auto;right:20px;transform:none}.nav-button{padding:9px 18px}.nav-button svg{width:15px;height:15px}.main{padding:24px}.sidebar{padding-left:10px;padding-right:10px}.sidebar-subtitle{padding-left:5px;padding-right:5px}.toc-title{font-size:11px}.toc-section{padding-left:23px}.toc-section .toc-title{font-size:10px}.toc-number{min-width:15px}.toc-audio{width:23px}.content-heading h1{font-size:21px}.pdf-stage{min-height:400px;padding:16px}.page-controls{padding:10px 14px}.page-jump{gap:6px}.page-jump label{display:none}.reader-location #reader-book-title{max-width:90px}.reader-location-divider{display:none}.reader-location>svg{display:none}.vocab-row,.vocab-table-head{grid-template-columns:minmax(160px,.9fr) minmax(170px,1.1fr);gap:13px;padding:18px 15px}.word-spelling{font-size:23px}.word-topline{gap:7px}.difficulty{display:none}.sentence{font-size:14px}.sentence-cell{padding-left:13px}.word-toolbar{gap:12px}.sort-label>span{display:none}.sort-label select{padding-left:6px;padding-right:6px}.basics-intro{gap:16px;padding:23px}.basics-mark{width:50px;font-size:65px}.audio-dock{left:calc(var(--sidebar) + 24px);right:24px}.audio-info{min-width:80px;max-width:135px}.audio-dock{gap:8px}.audio-time{font-size:8px;min-width:23px}}
@media(max-width:720px){:root{--header:119px;--sidebar:270px}.site-header{height:119px;padding:16px 19px 61px;align-items:center}.brand{min-width:0}.brand-icon{width:31px;height:35px;border-radius:8px 8px 11px 3px}.brand-icon svg{width:21px;height:21px}.brand-name{font-size:21px}.brand-name>span{font-size:12px}.brand-name small{display:none}.header-meta{display:flex;font-size:9px;gap:6px}.header-divider{margin:0}.main-nav{top:66px;left:18px;right:18px;bottom:12px;padding:3px;gap:3px}.nav-button{flex:1;justify-content:center;font-size:12px;padding:7px 12px;gap:7px}.nav-button svg{width:16px;height:16px}.workspace{min-height:calc(100vh - 119px)}.sidebar{position:fixed;left:0;top:0;bottom:0;z-index:80;height:100dvh;transform:translateX(-100%);transition:transform .22s ease;box-shadow:8px 0 30px #223f2520;padding:24px 16px}.sidebar.open{transform:translateX(0)}.sidebar-shade:not([hidden]){display:block;position:fixed;inset:0;background:#273e3545;z-index:70;backdrop-filter:blur(2px)}.sidebar-heading{margin-bottom:13px}.mobile-only{display:flex}.main{width:100%;padding:24px 18px 20px}.menu-button{display:flex;border:1px solid #e0e6d6;background:#fdfef7;width:31px;height:31px;color:#8da17a}.heading-left{gap:10px}.content-heading{margin-bottom:19px}.content-heading h1{font-size:19px}.eyebrow{font-size:7px;letter-spacing:1.4px;margin-bottom:3px}.reader-toolbar{min-height:52px;padding:9px 12px;gap:10px}.reader-location{font-size:10px;gap:6px}.reader-location #reader-book-title{max-width:80px}.reader-location #reader-section-title{max-width:150px}.reader-tools{gap:6px}.zoom-control select{font-size:9px;width:83px;padding-left:0}.reader-tools .icon-button{width:22px;height:25px;padding:3px}.reader-tools .icon-button svg{width:16px;height:16px}.pdf-stage{height:calc(100dvh - 359px);min-height:390px;padding:12px}.page-controls{min-height:56px;padding:8px 12px;gap:8px}.page-button{font-size:9px;gap:3px}.page-jump{font-size:9px;gap:5px}.page-jump input{width:34px;font-size:10px}.page-jump .text-button{font-size:9px;padding:3px}.lesson-materials{margin-top:15px}.lesson-materials>summary{padding:12px 13px;font-size:10px}.reader-tip{font-size:8px;line-height:1.8}.main-footer{margin-top:22px;letter-spacing:.2px;font-size:8px}.main-footer>span:first-child{font-size:7px;letter-spacing:1px}.footer-dot{margin:0 4px}.vocabulary-intro{padding:17px 18px;margin-bottom:18px}.vocabulary-intro p:not(.section-kicker){font-size:11px}.section-kicker{font-size:8px;letter-spacing:1.3px}.word-total{gap:5px}.word-total strong{font-size:28px}.word-total span{font-size:9px}.word-toolbar{gap:8px;align-items:center}.search-field{padding:0 10px;gap:7px;min-height:39px}.search-field input{font-size:10px;height:36px}.search-field input::placeholder{font-size:10px}.sort-label select{font-size:9px;width:89px;height:39px}.pronunciation-note{font-size:9px;margin-bottom:15px}.vocab-table-head{grid-template-columns:1fr;gap:0;padding:11px 16px;font-size:9px}.vocab-table-head>span:last-child{display:none}.vocab-row{grid-template-columns:1fr;gap:14px;padding:19px 16px}.word-spelling{font-size:26px}.difficulty{display:inline-block}.word-meaning{margin:8px 0 5px}.word-phonetics{font-size:10px}.sentence-cell{padding:12px 0 0;border-left:0;border-top:1px dashed #e7ecdd}.sentence{font-size:16px;margin-bottom:7px}.sentence-ref{font-size:9px}.word-topline .word-pronounce{width:28px;height:28px;margin-left:1px}.basics-intro{gap:14px;padding:22px 18px;margin-bottom:17px}.basics-mark{width:40px;font-size:59px}.basics-intro h2{font-size:19px}.basics-intro #basics-description{font-size:10px}.basics-search{margin-bottom:17px}.basics-grid{gap:10px}.basic-card{padding:18px 13px;min-height:165px}.basic-card .word-spelling{font-size:25px}.basic-card .word-pronounce{width:24px;height:24px;padding:4px;margin-left:0}.basic-card .word-pronounce svg{width:13px;height:13px}.basic-card .word-topline{gap:7px}.basic-card .word-meaning{font-size:10px}.basic-card .word-phonetics{font-size:9px;gap:3px;flex-direction:column}.basic-note{font-size:9px}.basic-example{font-size:12px}.audio-dock{left:12px;right:12px;bottom:12px;min-height:100px;display:grid;grid-template-columns:34px 1fr 31px 40px 23px;grid-template-rows:auto auto;gap:9px 10px;padding:13px 13px}.audio-cover{display:grid;grid-column:1;grid-row:1;width:31px;height:31px;border-radius:6px}.audio-cover svg{width:17px;height:17px}.audio-info{max-width:none;grid-column:2/4;grid-row:1}.audio-info strong{font-size:10px}.audio-info>span{font-size:7px}.audio-play{grid-column:1;grid-row:2;width:27px;height:27px;padding:6px}.audio-dock input[type=range]{grid-column:2/4;grid-row:2;width:100%;margin:0}.audio-dock #audio-current{grid-column:4;grid-row:2;font-size:9px;justify-self:end}.audio-dock #audio-duration{display:none}.audio-dock #audio-speed{grid-column:4;grid-row:1;padding:5px;font-size:8px;width:40px}.audio-dock #audio-close{grid-column:5;grid-row:1;width:23px;height:23px}.toast{font-size:11px;padding:12px 17px}.sidebar-footer{font-size:10px}.toc-title{font-size:12px}.toc-section .toc-title{font-size:11px}.toc-section{padding-left:31px}.toc-number{min-width:18px}.toc-audio{width:28px}.view{min-height:calc(100dvh - 290px)}}
@media(max-width:380px){.main{padding-left:13px;padding-right:13px}.header-meta{display:none}.reader-location #reader-section-title{max-width:110px}.reader-location #reader-book-title{max-width:65px}.reader-tools{gap:1px}.reader-toolbar{padding-left:10px;padding-right:8px}.page-controls{padding-left:9px;padding-right:9px}.main-footer>span:last-child{font-size:7px}.basics-grid{grid-template-columns:1fr}.basic-card .word-pronounce{margin-left:auto}.basic-card .word-phonetics{flex-direction:row;gap:12px}.basic-card{min-height:0;padding:20px}.basic-card .word-spelling{font-size:28px}.basic-card .word-meaning{font-size:11px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* Keep the learning content comfortable to read on a long study session. */
:root{--muted:#687667}
.toc-title,.toc-section .toc-title,.toc-basic{font-size:13px;color:#52674b}
.toc-number{font-size:11px;color:#6f8064}.toc-section .toc-number{font-size:10px}.toc-page{font-size:11px;color:#78876d}
.sidebar-subtitle{font-size:12px;color:#78866c}.sidebar-footer{font-size:11px;color:#78866c}.sidebar-footer small{color:#78866c}
.toc-basic .category-count{font-size:11px;color:#78876d}.toc-divider{color:#78876d}
.word-meaning{font-size:14px;color:#52664d}.word-phonetics{font-size:14px;line-height:1.8;gap:12px}.word-phonetics .syllables{color:#5d7651}.word-phonetics .ipa{color:#5f6c60}
.sentence{font-size:18px;color:#4d6844}.sentence-ref,.sentence-ref button{font-size:11px;color:#677d59}.difficulty{font-size:10px;color:#6b7b5b;border-color:#d4dec8}
.vocab-table-head{font-size:12px;color:#667b57}.pronunciation-note{font-size:12px;color:#6f7e65;line-height:1.9;margin-bottom:21px}
.vocabulary-intro p:not(.section-kicker){font-size:14px;color:#526f43}.word-total span{font-size:12px;color:#667e54}
.search-field input,.search-field input::placeholder{font-size:13px}.search-field input::placeholder{color:#7d8b71}.sort-label,.sort-label select{font-size:12px;color:#607653}
.basic-card .word-meaning{font-size:14px;color:#52664d}.basic-card .word-phonetics{font-size:14px}.basic-note{font-size:12px;color:#697d5d}.basic-example{font-size:15px;color:#5c7650}
.basics-intro #basics-description{font-size:13px;color:#637b55}.basics-sources{font-size:11px;color:#6b7d5f}.basics-sources a{color:#536f43}.pronunciation-guide{font-size:12px;line-height:1.9;color:#64785a;padding:15px 0;border-top:1px solid var(--line)}
.reader-location{font-size:12px;color:#677b5c}.reader-tip{font-size:11px;color:#77866a}.zoom-control select{font-size:12px;color:#627754}.page-button,.page-jump,.text-button{font-size:11px;color:#647b54}
.lesson-materials>summary{font-size:13px;color:#5b7350}.lesson-item-heading{font-size:14px}.lesson-download,.lesson-slide-details>summary{font-size:12px;color:#5b774a}.lesson-slide{font-size:14px;color:#5a724f}.lesson-slide strong{color:#395d2f}
.empty-state{font-size:14px;color:#687e5b}.empty-state small{font-size:12px;color:#7b8b6d}.audio-info strong{font-size:13px;color:#526f43}.audio-info>span{font-size:10px;color:#748863}.audio-time{font-size:11px;color:#657b56}.audio-dock select{font-size:11px;color:#627a52}
@media(max-width:960px){.vocab-row,.vocab-table-head{grid-template-columns:minmax(175px,.95fr) minmax(175px,1.1fr)}.word-phonetics{gap:4px 10px}.reader-location{font-size:11px}.zoom-control select{font-size:11px}}
@media(max-width:720px){
 .toc-title,.toc-section .toc-title,.toc-basic{font-size:13px}.toc-number{font-size:11px}.toc-section .toc-number{font-size:10px}.toc-page{font-size:11px}
 .vocab-row,.vocab-table-head{grid-template-columns:1fr}.word-meaning,.basic-card .word-meaning{font-size:14px}.word-phonetics,.basic-card .word-phonetics{font-size:13px;line-height:1.8}.sentence{font-size:18px}.sentence-ref,.sentence-ref button{font-size:11px}
 .basic-note,.pronunciation-note,.reader-tip{font-size:12px}.basics-intro #basics-description{font-size:12px}.basic-example{font-size:14px}.basics-sources{font-size:11px}.pronunciation-guide{font-size:12px}
 .basic-card .word-phonetics{gap:3px}.basic-card .word-meaning{margin-top:11px}.basics-grid{gap:12px}.basic-card{padding:19px 14px}.basic-card .word-spelling{font-size:26px}
 .search-field input,.search-field input::placeholder{font-size:12px}.sort-label select{font-size:11px;width:99px}.vocabulary-intro p:not(.section-kicker){font-size:12px}.word-total span{font-size:11px}
 .reader-location{font-size:10px}.reader-location #reader-book-title{max-width:70px}.reader-tools{gap:3px}.zoom-control select{font-size:10px;width:80px}.page-jump,.text-button,.page-button{font-size:11px}.page-jump .text-button{font-size:11px}.reader-tip{line-height:1.9}
 .audio-info strong{font-size:12px}.audio-info>span{font-size:9px}.audio-dock #audio-current{font-size:11px}.audio-dock #audio-speed{font-size:10px;width:45px}.audio-dock{grid-template-columns:34px 1fr 31px 45px 23px}
}
@media(max-width:380px){.basic-card .word-phonetics{flex-direction:row;gap:10px}.basic-card .word-meaning{font-size:14px}.reader-location #reader-book-title{max-width:55px}.zoom-control select{width:75px}}
.toc-audio-note{display:block;font-size:12px;line-height:1.7;color:#976039;margin-top:3px}
.reader-audio-note{border:1px solid #e3d9c3;border-bottom:0;background:#fbf2df;color:#805c33;padding:12px 18px;font-size:13px;line-height:1.8}
@media(max-width:720px){.reader-audio-note{padding:11px 12px;font-size:12px}}
/* The reader uses the available screen height; zoomed pages can still be panned. */
body[data-view=reading] .workspace{height:calc(100dvh - var(--header));min-height:0}
body[data-view=reading] .main{height:100%;display:flex;flex-direction:column;padding:16px 28px 10px;overflow:hidden}
body[data-view=reading] .content-heading{margin-bottom:12px;flex-shrink:0}
body[data-view=reading] .main-footer{display:none}
#reading-view:not([hidden]){display:flex;flex-direction:column;flex:1;min-height:0}
#reading-view .reader-toolbar{min-height:48px;padding:7px 14px;flex-shrink:0;gap:10px}
#reading-view .reader-location{flex:1;overflow:hidden}
#reading-view .reader-tools{gap:5px;flex-shrink:0}
#reading-view .reader-tools .icon-button{width:28px;height:28px}
#reading-view .zoom-control select{max-width:108px}
#reading-view .pdf-stage{flex:1;height:auto;min-height:0;max-height:none;overflow:auto;scrollbar-gutter:auto;padding:10px;overscroll-behavior:contain}
#reading-view .pdf-stage canvas{flex-shrink:0;margin:0}
#reading-view .page-controls{min-height:43px;padding:5px 15px;flex-shrink:0}
#reading-view .lesson-materials{margin-top:7px;flex-shrink:0;max-height:160px;overflow:auto}
#reading-view .lesson-materials>summary{padding:7px 14px}
#reading-view .reader-tip{margin:5px 0 0;font-size:10px;line-height:1.5;flex-shrink:0}
#reading-view .reader-audio-note{padding:6px 14px;font-size:12px;flex-shrink:0;max-height:72px;overflow:auto}
body[data-view=reading].audio-open .main{padding-bottom:103px}
#reading-view:fullscreen{height:100dvh;max-width:none;background:var(--paper);padding:12px;display:flex;flex-direction:column}
#reading-view:fullscreen .pdf-stage{min-height:0}
#reading-view:fullscreen .reader-tip,#reading-view:fullscreen .lesson-materials,#reading-view:fullscreen .reader-audio-note{display:none}
body.reader-focus[data-view=reading] .site-header,body.reader-focus[data-view=reading] .sidebar,body.reader-focus[data-view=reading] .content-heading{display:none}
body.reader-focus[data-view=reading] .workspace{height:100dvh}
body.reader-focus[data-view=reading] .main{width:100%;max-width:none;padding:8px}
.category-level{display:block;font-weight:400;color:#859276;font-size:10px;margin-top:2px}
.word-grammar{font-size:12px;color:#607752;line-height:1.8;margin:6px 0 0;overflow-wrap:anywhere}
.word-source{font-size:11px;color:#76876a;margin-top:5px}
@media(min-width:961px) and (max-width:1250px){.site-header .header-meta{display:none}.main-nav{left:auto;right:24px;transform:none}.nav-button{padding:10px 17px}}
@media(max-width:960px){.nav-button{padding:9px 13px}body[data-view=reading] .main{padding:12px 16px 9px}}
@media(max-width:720px){
 .nav-button{padding:7px 5px;font-size:11px;gap:5px}.nav-button svg{width:14px;height:14px}
 body[data-view=reading] .main{padding:10px 10px 7px}.content-heading .eyebrow{font-size:7px}
 body[data-view=reading] .content-heading{margin-bottom:8px}.content-heading h1{font-size:19px}
 #reading-view .reader-toolbar{flex-wrap:wrap;padding:5px 8px;gap:2px;min-height:44px}
 #reading-view .reader-location{min-width:70px;font-size:10px}
 #reading-view .reader-location #reader-book-title{display:none}
 #reading-view .reader-tools{gap:2px}
 #reading-view .reader-tools .icon-button{width:24px;height:26px;padding:4px}
 #reading-view .reader-tools .icon-button svg{width:16px;height:16px}
 #reading-view .zoom-control select{width:83px;font-size:11px;max-width:83px}
 #reading-view .pdf-stage{padding:6px;min-height:0}
 #reading-view .page-controls{padding:4px 8px;min-height:40px}
 #reading-view .lesson-materials{max-height:120px;margin-top:5px}
 #reading-view .lesson-materials>summary{padding:5px 9px;font-size:11px}
 #reading-view .reader-tip{font-size:9px;margin-top:4px}
 body[data-view=reading].audio-open .main{padding-bottom:125px}
 #reading-view:fullscreen{padding:6px}
}
@media(max-width:360px){#reading-view .reader-location{flex-basis:100%}#reading-view .reader-tools{margin-left:auto}}
.word-spelling{overflow-wrap:anywhere}.sentence-ref{flex-wrap:wrap}.word-cell{min-width:0}
.example-label{display:block;font:11px var(--sans);color:#849276;margin-bottom:5px;letter-spacing:.4px}
.word-rate-control{display:inline-flex;align-items:center;gap:7px;font-size:12px;color:var(--muted);white-space:nowrap}
.word-rate-control select{font:inherit;color:var(--ink);border:1px solid var(--line);border-radius:7px;background:var(--paper);padding:6px 7px;min-height:32px;cursor:pointer}
.word-rate-control.compact{margin-right:3px}
.word-rate-control.compact select{font-size:11px;min-height:28px;padding:3px 2px;max-width:68px}
.word-rate-control select:focus-visible{outline:2px solid var(--green);outline-offset:2px}

/* Keep the directory and its footer anchored while the lesson scrolls. */
.site-header{position:sticky;top:0}
.sidebar{overflow:hidden;align-self:flex-start}
.sidebar-heading,.book-switch,.sidebar-subtitle,.sidebar-footer{flex-shrink:0}
.toc{min-height:0;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#cbd4c0 transparent}
@media(min-width:721px){.sidebar{top:var(--header);height:calc(100dvh - var(--header))}}
.compare-launch{display:inline-flex;align-items:center;gap:5px;padding:6px 9px;border:1px solid #d8e2cd;border-radius:6px;font-size:12px;white-space:nowrap;background:#eef3e7;color:var(--green)}
.compare-launch svg{width:15px;height:15px}
.compare-launch:hover{background:#dfead5}
body[data-view=compare] .workspace{height:calc(100dvh - var(--header));min-height:0}
body[data-view=compare] #sidebar,body[data-view=compare] .content-heading,body[data-view=compare] .main-footer{display:none}
body[data-view=compare] .main{width:100%;max-width:none;height:100%;padding:10px 16px;overflow:hidden;display:flex;flex-direction:column}
body[data-view=compare] .audio-dock{left:20px;right:20px}
@media(max-width:720px){
 .sidebar{padding-bottom:calc(24px + env(safe-area-inset-bottom))}
 .compare-launch{padding:5px 6px;font-size:10px;gap:3px}.compare-launch svg{display:none}
 body[data-view=compare] .main{padding:7px}
 body[data-view=compare] .audio-dock{left:12px;right:12px}
}