@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&family=Manrope:wght@500;600;650;700;750;800&display=swap');
:root{--bg:#fff;--sidebar:#f7f7f5;--paper:#fff;--soft:#f7f7f5;--ink:#292927;--muted:#777773;--line:#e9e9e5;--accent:#6253a4;--accent-bg:#f1eef9;--green:#34735b;--green-bg:#edf5ef;--amber:#93672a;--amber-bg:#fbf3e7;--blue:#3c6e99;--blue-bg:#edf3f9;--red:#aa4d4d;--red-bg:#fbefef;--shadow:0 12px 50px #28251e12;color-scheme:light}
:root[data-theme=dark]{--bg:#191919;--sidebar:#151515;--paper:#202020;--soft:#252525;--ink:#eeede9;--muted:#a7a6a0;--line:#33332f;--accent:#b5a2f2;--accent-bg:#2a2638;--green:#9ac7aa;--green-bg:#233127;--amber:#d6b883;--amber-bg:#332e24;--blue:#9ebddd;--blue-bg:#242e38;--red:#efaaaa;--red-bg:#392929;--shadow:0 12px 50px #0005;color-scheme:dark}
*{box-sizing:border-box}body{margin:0;font-family:'DM Sans',system-ui,sans-serif;background:var(--bg);color:var(--ink);font-size:14px;-webkit-font-smoothing:antialiased}button,input,textarea,select{font:inherit;color:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.55;cursor:wait}a{color:inherit;text-decoration:none}button{background:none;border:0}h1,h2,h3,h4,p{margin:0}h1,h2,h3{font-family:'Manrope',system-ui,sans-serif}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px}input:focus,textarea:focus,select:focus{outline:2px solid var(--accent);outline-offset:2px}svg{width:18px;height:18px;flex-shrink:0;vertical-align:middle;stroke:currentColor;fill:none;stroke-width:1.65;stroke-linecap:round;stroke-linejoin:round}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}[hidden]{display:none!important}.skip{position:fixed;top:-70px;left:20px;padding:12px;background:var(--paper);z-index:120}.skip:focus{top:10px}.loading{padding:80px;color:var(--muted)}.eyebrow{font-size:10px;letter-spacing:1.6px;color:var(--muted);font-weight:600}.muted{color:var(--muted);line-height:1.8}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:39px;border:1px solid var(--line);border-radius:7px;padding:9px 13px;background:var(--paper);font-size:12px;font-weight:500;white-space:nowrap}.button:hover{background:var(--soft)}.button.primary{background:var(--ink);color:var(--bg);border-color:var(--ink)}.button.quiet{background:transparent;border-color:transparent;color:var(--muted)}.icon-button{display:inline-flex;justify-content:center;align-items:center;min-width:36px;min-height:36px;border-radius:6px;font-size:23px;color:var(--muted)}.icon-button:hover{background:var(--soft);color:var(--ink)}.actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.page-top{margin-bottom:28px}.page-top h1{font-size:35px;letter-spacing:-1.3px;line-height:1.3;margin:15px 0}.page-top>p{color:var(--muted);line-height:1.9;max-width:650px}.tag{font-size:10px;padding:4px 7px;border-radius:4px;background:var(--soft);color:var(--muted);display:inline-block}.tag.book{background:var(--blue-bg);color:var(--blue)}.tag.original{background:var(--accent-bg);color:var(--accent)}
.sidebar{width:240px;position:fixed;inset:0 auto 0 0;background:var(--sidebar);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:23px 14px 16px;z-index:40}.brand{display:flex;align-items:center;gap:10px;padding:4px 9px 23px;font-weight:650;font-size:13px}.brand-symbol{display:grid;place-items:center;width:30px;height:32px;background:var(--paper);border:1px solid var(--line);border-radius:7px;font-family:Georgia,serif;font-size:23px;font-weight:bold}.brand small{display:block;font-size:10px;font-weight:400;color:var(--muted);margin-top:4px}.sidebar-search{border:1px solid var(--line);background:var(--paper);border-radius:6px;display:flex;align-items:center;gap:8px;padding:10px 11px;font-size:12px;color:var(--muted);margin-bottom:22px}.sidebar-search kbd{margin-left:auto;font-family:inherit;font-size:9px;border:1px solid var(--line);padding:1px 3px;border-radius:3px}.nav-group{margin-bottom:22px}.nav-label{font-size:10px;color:var(--muted);display:block;margin:0 10px 9px;letter-spacing:.4px}.side-link{display:flex;align-items:center;gap:9px;padding:9px 10px;border-radius:6px;font-size:12px;color:var(--muted);line-height:1.4;margin:2px 0}.side-link:hover{background:var(--line);color:var(--ink)}.side-link.active{background:var(--line);color:var(--ink);font-weight:550}.side-link .mini-unit{min-width:24px;width:24px;height:25px;display:grid;place-items:center;border-radius:5px;font-size:10px;font-weight:650;background:var(--tone-bg);color:var(--tone)}.side-link>span:last-child{max-width:160px}.sidebar-bottom{margin-top:auto;padding:14px 9px 0;border-top:1px solid var(--line);font-size:10px;color:var(--muted);line-height:1.8}.sidebar-bottom>span{display:flex;align-items:center;gap:7px;margin-bottom:4px}.status-dot{width:6px;height:6px;border-radius:50%;background:var(--green)}.layout{margin-left:240px}.topbar{height:68px;border-bottom:1px solid var(--line);padding:0 34px;display:flex;align-items:center;justify-content:space-between;gap:15px;position:sticky;top:0;background:color-mix(in srgb,var(--bg) 96%,transparent);backdrop-filter:blur(12px);z-index:25}.breadcrumb{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:10px}.breadcrumb strong{font-weight:500;color:var(--ink)}.breadcrumb>span{color:var(--line)}.top-actions{display:flex;align-items:center;gap:8px}.top-actions .button{min-height:33px;padding:6px 10px;font-size:11px}.top-actions .icon-button{min-height:33px;min-width:33px}.mobile-menu{display:none}.content{padding:51px 52px 90px;max-width:1260px;margin:auto;min-height:calc(100vh - 68px)}.footer{font-size:10px;color:var(--muted);line-height:1.9;max-width:1100px;padding:0 52px 28px;margin:auto;border-top:1px solid var(--line)}.footer p{padding-top:19px}.tone-violet{--tone:var(--accent);--tone-bg:var(--accent-bg)}.tone-blue{--tone:var(--blue);--tone-bg:var(--blue-bg)}.tone-amber{--tone:var(--amber);--tone-bg:var(--amber-bg)}.tone-green{--tone:var(--green);--tone-bg:var(--green-bg)}
.home-hero{padding:12px 0 30px;max-width:710px}.home-hero h1{font-size:48px;letter-spacing:-2.1px;line-height:1.18;margin:24px 0 21px}.home-hero h1>span{color:var(--muted);font-weight:500}.home-hero p{font-size:14px;color:var(--muted);line-height:1.9;max-width:590px}.home-hero .actions{margin-top:25px}.home-hero .eyebrow{display:flex;gap:8px;align-items:center}.little-dot{width:6px;height:6px;border-radius:50%;background:var(--accent)}.overview-stats{border:1px solid var(--line);border-radius:10px;display:grid;grid-template-columns:repeat(3,1fr);padding:20px 0;margin:11px 0 40px;max-width:760px}.overview-stats>div{padding:0 24px;border-right:1px solid var(--line)}.overview-stats>div:last-child{border:0}.overview-stats strong{display:block;font-size:22px;letter-spacing:-.6px;margin-bottom:6px;font-family:Manrope,sans-serif}.overview-stats span{font-size:10px;color:var(--muted)}.section-title{display:flex;align-items:center;justify-content:space-between;margin:30px 0 18px;gap:10px}.section-title h2{font-size:19px;letter-spacing:-.5px}.section-title>span{font-size:11px;color:var(--muted)}.unit-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.unit-card{border:1px solid var(--line);border-radius:10px;padding:25px;transition:background .2s,border-color .2s;display:flex;flex-direction:column}.unit-card:hover{border-color:var(--tone);background:color-mix(in srgb,var(--tone-bg) 30%,var(--bg))}.unit-card-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}.unit-glyph{width:39px;height:39px;display:grid;place-items:center;border-radius:8px;background:var(--tone-bg);color:var(--tone)}.unit-card-head>span{font-size:10px;color:var(--muted)}.unit-card h3{font-size:19px;letter-spacing:-.55px;line-height:1.45;margin-bottom:10px}.unit-card p{font-size:12px;color:var(--muted);line-height:1.8;margin-bottom:24px}.unit-meta{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:10px;color:var(--muted);margin-top:auto}.progress{height:3px;background:var(--line);border-radius:5px;overflow:hidden;margin-top:14px}.progress>i{display:block;height:100%;background:var(--tone,var(--accent));border-radius:5px}.getting-started{border:1px solid var(--line);background:var(--soft);border-radius:8px;padding:18px 20px;margin-top:26px}.getting-started>summary{cursor:pointer;font-size:12px;font-weight:550}.getting-started ol{padding:14px 0 0 18px;margin:0;color:var(--muted);font-size:12px;line-height:2.1}.scope-note{font-size:11px;color:var(--muted);line-height:1.9;margin-top:27px}
.unit-heading{margin-bottom:24px;max-width:790px}.unit-heading .unit-glyph{width:49px;height:49px;margin-bottom:23px}.unit-heading h1{font-size:37px;letter-spacing:-1.4px;line-height:1.3;margin:13px 0}.unit-heading>p{font-size:14px;line-height:1.95;color:var(--muted)}.unit-tools{display:flex;justify-content:space-between;align-items:center;gap:14px;margin:25px 0 28px;flex-wrap:wrap}.unit-tools .muted{font-size:11px}.tabs{display:flex;border-bottom:1px solid var(--line);gap:24px;margin:0 0 30px}.tabs a{font-size:12px;padding:11px 1px;color:var(--muted);border-bottom:2px solid transparent;display:flex;align-items:center;gap:7px}.tabs a.active{color:var(--ink);border-color:var(--ink)}.reader-layout{display:grid;grid-template-columns:minmax(0,1fr) 190px;gap:40px}.reader-body{min-width:0;max-width:760px}.on-this-page{position:sticky;top:95px;align-self:start;max-height:calc(100dvh - 140px);overflow:auto;border-left:1px solid var(--line);padding:3px 0 0 17px}.on-this-page h2{font-size:10px;font-family:inherit;margin-bottom:15px;color:var(--muted);font-weight:500}.on-this-page a{display:block;font-size:10px;color:var(--muted);line-height:1.7;padding:6px 0}.on-this-page a.sub{padding-left:9px;font-size:9px}.on-this-page a:hover{color:var(--accent)}.objectives{background:var(--soft);border-radius:8px;padding:20px 23px;margin-bottom:20px;font-size:12px}.objectives>summary{cursor:pointer;font-weight:550}.objectives ul{margin:12px 0 0;padding-left:18px;line-height:1.9;color:var(--muted)}.lesson-section{padding:29px 0;border-bottom:1px solid var(--line);scroll-margin-top:90px}.lesson-section.subsection{padding:25px 0}.lesson-section h2{font-size:24px;letter-spacing:-.7px;line-height:1.5;margin:8px 0 18px}.lesson-section h3{font-size:19px;letter-spacing:-.4px;line-height:1.5;margin:8px 0 15px}.section-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:9px;color:var(--muted)}.read-toggle{display:flex;align-items:center;gap:6px;color:var(--muted);min-height:30px;font-size:10px;padding:4px 0 4px 8px}.read-toggle[aria-pressed=true]{color:var(--green)}.read-toggle svg{width:14px;height:14px}.lesson-copy{font-size:14px;line-height:1.95}.lesson-copy p{margin:0 0 15px}.lesson-copy ul{padding-left:20px;margin:12px 0 20px}.lesson-copy li{margin:6px 0;padding-left:3px}.lesson-copy mark{background:#f6e7a9;color:inherit;border-radius:2px;padding:1px 0}:root[data-theme=dark] .lesson-copy mark{background:#594b28}.lesson-copy code{background:var(--soft);border:1px solid var(--line);padding:2px 4px;border-radius:4px;font-size:12px}.lesson-copy table{width:100%;border-collapse:collapse;font-size:12px;line-height:1.8;min-width:350px}.table-wrap{overflow-x:auto;margin:20px 0;border:1px solid var(--line);border-radius:6px}.lesson-copy th,.lesson-copy td{border-bottom:1px solid var(--line);border-right:1px solid var(--line);padding:11px 13px;text-align:left;vertical-align:top}.lesson-copy th{background:var(--soft);font-weight:600}.example{border-left:3px solid var(--tone,var(--accent));background:var(--tone-bg,var(--accent-bg));padding:17px 19px;margin:21px 0;border-radius:0 7px 7px 0;font-size:12px;line-height:1.9}.example strong{display:block;font-size:10px;color:var(--tone,var(--accent));margin-bottom:6px}.takeaway{display:flex;align-items:start;gap:9px;font-size:12px;line-height:1.9;padding:13px 0}.takeaway svg{color:var(--amber);margin-top:3px;width:15px;height:15px}.pitfall{color:var(--muted);font-size:12px;line-height:1.9;margin:8px 0}.pitfall b{font-weight:550;color:var(--ink)}.source-note{font-size:11px;background:var(--amber-bg);padding:12px 15px;border-radius:5px;line-height:1.8;color:var(--amber);margin:15px 0}.section-actions{display:flex;gap:10px;margin-top:20px}.section-actions button{font-size:10px;color:var(--muted);display:flex;align-items:center;gap:5px;padding:5px 0;min-height:31px}.section-actions svg{width:13px;height:13px}.section-notes{margin-top:10px}.inline-note{font-size:12px;padding:12px 14px;background:var(--amber-bg);border-radius:6px;margin:7px 0;line-height:1.8;white-space:pre-wrap}.inline-note small{font-size:9px;display:block;color:var(--muted)}.coverage{margin-top:30px;border:1px solid var(--line);border-radius:8px;padding:17px 20px;font-size:11px;line-height:1.9}.coverage summary{cursor:pointer;font-weight:550}.coverage ul{padding-left:18px;color:var(--muted)}.vocab-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.vocab-card{padding:20px;border:1px solid var(--line);border-radius:8px}.vocab-card h2{font-size:15px;margin-bottom:9px}.vocab-card p{color:var(--muted);font-size:12px;line-height:1.9}.mobile-toc{display:none}.print-heading{display:none}
.practice-tools{display:flex;gap:9px;align-items:center;flex-wrap:wrap;padding-bottom:22px;border-bottom:1px solid var(--line);margin-bottom:23px}.practice-tools label{font-size:10px;color:var(--muted);display:flex;flex-direction:column;gap:6px}.practice-tools select{background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:8px 10px;min-height:36px;font-size:11px;max-width:100%}.practice-count{font-size:11px;color:var(--muted);margin-left:auto}.quiz-question{border:1px solid var(--line);border-radius:9px;padding:25px;margin:15px 0;scroll-margin-top:90px}.question-meta{display:flex;align-items:center;gap:7px;margin-bottom:16px;font-size:10px;color:var(--muted);flex-wrap:wrap}.question-meta .question-number{margin-left:auto}.quiz-question h2{font-size:15px;line-height:1.85;letter-spacing:-.2px;margin-bottom:20px;font-family:inherit;white-space:pre-line}.options{display:grid;gap:8px}.option{display:flex;align-items:center;gap:12px;text-align:left;border:1px solid var(--line);border-radius:6px;padding:12px 14px;font-size:12px;line-height:1.7;width:100%}.option>span{font-size:10px;color:var(--muted);border:1px solid var(--line);border-radius:4px;width:23px;height:23px;display:grid;place-items:center;flex-shrink:0}.option:hover{background:var(--soft)}.option.selected{border-color:var(--accent);background:var(--accent-bg)}.option.correct{border-color:var(--green);background:var(--green-bg)}.option.wrong{border-color:var(--red);background:var(--red-bg)}.answer-feedback{background:var(--green-bg);padding:17px 20px;border-radius:6px;margin-top:17px;font-size:12px;line-height:1.9}.answer-feedback.wrong{background:var(--red-bg)}.answer-feedback strong{display:block;margin-bottom:6px}.answer-feedback p{white-space:pre-line}.answer-feedback ul{padding-left:18px}.question-actions{display:flex;align-items:center;gap:8px;margin-top:17px;flex-wrap:wrap}.question-actions .button{font-size:11px}.written-draft{width:100%;resize:vertical;min-height:105px;border:1px solid var(--line);border-radius:6px;background:var(--paper);padding:13px;font-size:13px;line-height:1.8}.draft-label{display:flex;justify-content:space-between;gap:12px;font-size:10px;color:var(--muted);margin-bottom:9px}.empty{padding:40px 20px;text-align:center;border:1px dashed var(--line);border-radius:8px;color:var(--muted);font-size:13px;line-height:2}.notes-grid{display:grid;gap:14px}.note-card{border:1px solid var(--line);border-radius:8px;padding:23px}.note-card>header{display:flex;align-items:center;gap:10px;justify-content:space-between;margin-bottom:14px;font-size:10px;color:var(--muted)}.note-card blockquote{font-size:12px;border-left:2px solid var(--amber);padding-left:12px;color:var(--muted);margin:0 0 17px;line-height:1.9}.note-card>p{white-space:pre-wrap;line-height:1.9;font-size:13px}.note-card .actions{margin-top:17px}.note-card .button{font-size:10px}.notes-notice{font-size:12px;line-height:1.9;background:var(--soft);padding:19px 22px;border-radius:8px;margin-bottom:25px}
dialog{position:fixed;inset:0;margin:auto;background:var(--paper);color:var(--ink);border:1px solid var(--line);border-radius:13px;padding:27px;width:min(540px,calc(100vw - 28px));max-height:calc(100dvh - 36px);overflow:auto;box-shadow:var(--shadow)}dialog::backdrop{background:#0006;backdrop-filter:blur(3px)}.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:13px}.dialog-head h2{font-size:21px;letter-spacing:-.6px}dialog>.muted,dialog form>.muted{font-size:11px}.field{display:block;font-size:12px;margin:22px 0 18px}.field textarea{display:block;width:100%;padding:12px;background:var(--bg);border:1px solid var(--line);border-radius:6px;margin-top:9px;resize:vertical;font-size:13px;line-height:1.9}#note-quote{margin:20px 0;font-size:12px;line-height:1.8;border-left:2px solid var(--amber);padding-left:13px;color:var(--muted);max-height:180px;overflow:auto}#search-dialog{width:min(650px,calc(100vw - 28px))}#global-search{width:100%;font-size:15px;padding:12px 0;border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent;margin:0 0 15px}#global-search:focus{outline:none;border-color:var(--accent)}.search-hit{display:block;padding:14px 10px;border-bottom:1px solid var(--line);font-size:12px}.search-hit:hover{background:var(--soft)}.search-hit strong{display:block;margin-bottom:6px}.search-hit small{color:var(--muted);line-height:1.8}.search-status{font-size:11px;color:var(--muted);padding:15px 0}#selection-tools{position:fixed;z-index:60;display:flex;padding:4px;border-radius:7px;background:var(--ink);color:var(--bg);box-shadow:var(--shadow);gap:2px}#selection-tools button{font-size:10px;padding:9px;color:inherit;border-radius:4px}#selection-tools button:hover{background:#ffffff20}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:12px 18px;border-radius:7px;font-size:12px;z-index:150;max-width:90vw;box-shadow:var(--shadow);display:none}#toast.show{display:block}
#assistant{position:fixed;right:20px;bottom:20px;top:88px;width:410px;border:1px solid var(--line);border-radius:13px;background:var(--paper);box-shadow:var(--shadow);z-index:65;display:flex;flex-direction:column;overflow:hidden}#assistant>header{padding:20px 20px 16px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}#assistant h2{font-size:18px;margin-top:6px}#assistant .eyebrow{font-size:8px}.ai-context{font-size:11px;color:var(--accent);background:var(--accent-bg);padding:10px 20px;line-height:1.7}.ai-log{flex:1;min-height:0;overflow:auto;padding:20px}.ai-welcome{font-size:13px;line-height:1.95;color:var(--muted)}.ai-starters{display:grid;gap:8px;margin-top:20px}.ai-starters button{font-size:11px;border:1px solid var(--line);border-radius:6px;padding:11px;text-align:left;line-height:1.7}.ai-starters button:hover{background:var(--soft)}.ai-msg{font-size:12px;line-height:1.95;white-space:pre-wrap;overflow-wrap:anywhere;margin-bottom:22px}.ai-msg>small{font-size:9px;display:block;font-weight:600;color:var(--accent);margin-bottom:7px}.ai-msg.user{background:var(--soft);padding:13px;border-radius:8px}.ai-wait{font-size:11px;color:var(--muted)}#ai-form{padding:16px;border-top:1px solid var(--line)}#ai-input{background:var(--bg);border:1px solid var(--line);border-radius:7px;padding:11px;width:100%;resize:none;font-size:12px;line-height:1.8}.ai-bottom{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:10px}.ai-bottom small{font-size:8px;color:var(--muted);line-height:1.7}#ai-error{font-size:11px;color:var(--red);line-height:1.8;margin-top:7px}#speech-player{position:fixed;bottom:20px;left:calc(50% + 120px);transform:translateX(-50%);z-index:50;display:flex;align-items:center;gap:13px;border:1px solid var(--line);background:var(--paper);box-shadow:var(--shadow);padding:9px 10px 9px 17px;border-radius:10px;max-width:calc(100vw - 28px)}#speech-label{font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:210px}#speech-player .button{font-size:10px;min-height:30px;padding:6px 9px}
@media(min-width:1450px){.content{padding-top:65px}.home-hero{padding-top:20px}}
@media(max-width:1250px){.reader-layout{grid-template-columns:1fr}.on-this-page{display:none}.mobile-toc{display:block;border:1px solid var(--line);padding:15px 18px;border-radius:7px;margin-bottom:22px;font-size:12px}.mobile-toc summary{cursor:pointer}.mobile-toc a{display:block;font-size:11px;color:var(--muted);padding:7px 0;line-height:1.6}.mobile-toc a.sub{padding-left:12px}.reader-body{max-width:800px}.content{padding-left:38px;padding-right:38px}}
@media(max-width:900px){.sidebar{width:215px;padding-left:10px;padding-right:10px}.layout{margin-left:215px}.content{padding:35px 28px 70px}.topbar{padding:0 25px}.breadcrumb>.desktop-crumb{display:none}.unit-grid{gap:12px}.unit-card{padding:20px}.unit-card h3{font-size:17px}.home-hero h1{font-size:42px}.overview-stats>div{padding:0 16px}.footer{padding:0 28px 25px}.unit-heading h1{font-size:32px}#speech-player{left:calc(50% + 107px)}}
@media(max-width:700px){.sidebar{transform:translateX(-100%);width:260px;transition:transform .18s}.sidebar.open{transform:none;box-shadow:0 0 0 100vmax #0006}.layout{margin-left:0}.topbar{height:60px;padding:0 13px;gap:6px}.mobile-menu{display:inline-flex}.breadcrumb{gap:7px;font-size:10px;min-width:0}.breadcrumb strong{max-width:165px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.top-actions{gap:3px}.top-actions .button{font-size:10px;gap:5px;padding:7px}.top-actions .button svg{width:14px;height:14px}.content{padding:31px 22px 70px}.home-hero{padding-top:6px}.home-hero h1{font-size:38px;letter-spacing:-1.6px;margin-top:22px}.home-hero p{font-size:13px}.home-hero .eyebrow{font-size:8px;letter-spacing:1px}.overview-stats{padding:17px 0;margin-bottom:32px}.overview-stats>div{padding:0 13px}.overview-stats strong{font-size:20px}.overview-stats span{font-size:9px}.unit-grid{grid-template-columns:1fr}.unit-card{padding:23px}.unit-card-head{margin-bottom:17px}.unit-card h3{font-size:19px}.unit-card p{margin-bottom:22px}.section-title h2{font-size:18px}.footer{padding:0 22px 24px}.unit-heading h1{font-size:29px;letter-spacing:-1px}.unit-heading>p{font-size:13px}.unit-heading .eyebrow{font-size:9px}.unit-tools{gap:10px}.unit-tools .button{font-size:10px;min-height:35px;padding:8px 10px}.unit-tools .muted{font-size:10px}.tabs{gap:19px;margin-bottom:22px}.tabs a{font-size:11px}.lesson-copy{font-size:14px;line-height:2}.lesson-section h2{font-size:22px}.lesson-section h3{font-size:18px}.lesson-section{padding:25px 0}.section-meta{font-size:8px}.read-toggle{font-size:10px}.section-actions{gap:17px}.section-actions button{font-size:11px}.example{padding:15px 16px}.vocab-grid{grid-template-columns:1fr}.quiz-question{padding:20px 17px}.quiz-question h2{font-size:14px}.option{padding:11px 10px;font-size:12px;gap:9px}.practice-tools{gap:8px}.practice-tools label{flex:1;min-width:100px}.practice-tools select{width:100%;font-size:10px;padding:8px}.practice-count{width:100%;margin-top:5px}.page-top h1{font-size:29px}.question-meta{font-size:9px}.question-actions .button{font-size:10px;padding:8px 10px}.note-card{padding:20px}.note-card>header{line-height:1.8}.notes-notice{font-size:11px;padding:17px}.notes-actions .button{font-size:10px}#assistant{inset:0;width:100%;height:100dvh;border:0;border-radius:0;z-index:100}#assistant>header{padding-top:max(16px,env(safe-area-inset-top))}#ai-form{padding-bottom:max(16px,env(safe-area-inset-bottom))}#speech-player{left:50%;bottom:max(12px,env(safe-area-inset-bottom))}#speech-label{max-width:130px}dialog{padding:22px}.dialog-head h2{font-size:19px}.top-actions .button .ai-button-label{display:none}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
@media print{.sidebar,.topbar,.footer,.tabs,.unit-tools,.on-this-page,.mobile-toc,.section-actions,.read-toggle,.coverage,.skip,#assistant,#speech-player,#toast,#selection-tools{display:none!important}.layout{margin:0}.content{padding:0;max-width:none}.reader-layout{display:block}.reader-body{max-width:none}.lesson-section{break-inside:avoid;scroll-margin:0}.unit-heading h1{font-size:26px}.lesson-copy{font-size:11px;line-height:1.7}.example{background:#f5f5f5}.print-heading{display:block}.quiz-question{break-inside:avoid}body{background:#fff;color:#111}}

/* Reading workspace, accessible text and focused practice — v3 */
:root{--reader-font:18px;--note-yellow:#f5e6ae;--note-purple:#e4d9f9;--note-blue:#d4e7f7;--note-green:#d9ebde}
.content{max-width:1480px}.reader-layout{grid-template-columns:minmax(0,1fr) 255px;gap:38px}.on-this-page{padding:18px 0 18px 20px;top:92px;background:var(--bg)}.on-this-page h2{font-size:12px;letter-spacing:1.2px;margin-bottom:17px;font-weight:650;color:var(--ink)}.on-this-page a{font-size:15px;line-height:1.75;padding:9px 10px;margin-left:-10px;border-radius:6px;color:var(--muted);overflow-wrap:anywhere}.on-this-page a.sub{font-size:14px;padding-left:20px;line-height:1.8}.on-this-page a.is-current{color:var(--accent);background:var(--accent-bg);font-weight:600}.on-this-page a:hover{background:var(--soft)}.lesson-copy{font-size:var(--reader-font);line-height:1.95}.lesson-section h2{font-size:calc(var(--reader-font) + 7px)}.lesson-section h3{font-size:calc(var(--reader-font) + 3px)}.lesson-copy p{margin-bottom:20px}.lesson-copy li{margin:9px 0}.lesson-copy table{font-size:calc(var(--reader-font) - 2px)}.example{font-size:calc(var(--reader-font) - 2px);line-height:1.9;padding:20px 22px}.example p{margin:0}.example>strong{font-size:11px;margin-bottom:8px}.takeaway,.pitfall{font-size:calc(var(--reader-font) - 2px);line-height:1.9}.unit-heading>p{font-size:16px;line-height:1.9}.section-meta{font-size:11px}.read-toggle{font-size:12px;min-height:38px}.section-actions{gap:24px}.section-actions button{font-size:13px;min-height:40px}.section-actions svg{width:16px;height:16px}.unit-tools>.muted{font-size:12px;line-height:1.8}.reader-size-button{font-family:Georgia,serif;font-size:20px;min-width:39px;min-height:38px;border-radius:7px}.reader-size-button:hover{background:var(--soft)}.settings-label{font-size:13px;margin:27px 0 13px}.font-choices{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.font-choices button{display:grid;gap:10px;place-items:center;border:1px solid var(--line);border-radius:9px;min-height:86px;padding:13px 6px}.font-choices button span{font-size:11px;color:var(--muted)}.font-choices button[aria-pressed=true]{background:var(--accent-bg);border-color:var(--accent);color:var(--accent)}.setting-toggle{display:flex;align-items:center;gap:20px;justify-content:space-between;margin:25px 0;padding:21px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.setting-toggle strong{display:block;font-size:13px;margin-bottom:7px}.setting-toggle small{display:block;color:var(--muted);font-size:11px;line-height:1.8}.setting-toggle input{width:20px;height:20px;accent-color:var(--accent);flex-shrink:0}
::highlight(reading){background:#ffe272;color:#222;text-decoration:underline;text-decoration-color:#d3a83b;text-decoration-thickness:2px}.speech-active{background:#ffe272!important;color:#222!important;border-radius:4px;box-shadow:0 0 0 4px #ffe272}#speech-player{display:block;left:calc(50% + 120px);width:min(750px,calc(100vw - 290px));max-width:none;border-radius:15px;padding:0;background:var(--paper);z-index:55;overflow:visible}#speech-player .speech-track{height:3px;background:var(--line);overflow:hidden;border-radius:15px 15px 0 0}#speech-progress-bar{height:3px;background:var(--accent);display:block;transition:width .15s}.speech-main{display:flex;align-items:center;gap:12px;padding:13px 15px}.speech-now{display:flex;align-items:center;gap:11px;min-width:0;flex:1}.speech-live-dot{width:8px;height:8px;border-radius:50%;background:var(--accent);flex-shrink:0}.speech-now>div{min-width:0}.speech-now small{display:block;font-size:8px;letter-spacing:1.2px;color:var(--muted);margin-bottom:5px}#speech-label{display:block;font-size:12px;font-weight:550;max-width:300px;white-space:nowrap;text-overflow:ellipsis;overflow:hidden}#speech-progress{font-size:10px;color:var(--muted);white-space:nowrap}#speech-player .button{min-height:38px;font-size:12px;padding:8px 12px}#speech-settings{position:relative}#speech-settings>summary{list-style:none;cursor:pointer;min-height:38px;display:flex;align-items:center;padding:8px 10px;border-radius:7px;font-size:12px}#speech-settings>summary:hover{background:var(--soft)}#speech-settings>summary::-webkit-details-marker{display:none}.speech-settings-panel{position:absolute;bottom:calc(100% + 22px);right:0;width:310px;padding:22px;background:var(--paper);border:1px solid var(--line);border-radius:13px;box-shadow:var(--shadow);max-height:65dvh;overflow:auto}.speech-settings-panel>label{display:block;font-size:12px;font-weight:550;margin-bottom:18px}.speech-settings-panel select{display:block;max-width:100%;width:100%;min-height:40px;border:1px solid var(--line);border-radius:6px;background:var(--bg);font-size:12px;padding:8px;margin-top:9px}.speech-settings-panel input[type=range]{display:block;width:100%;accent-color:var(--accent);margin-top:10px}.speech-settings-panel .follow-setting{display:flex;gap:9px;align-items:center;font-weight:400}.follow-setting input{width:18px;height:18px;accent-color:var(--accent)}.speech-settings-panel>small{display:block;font-size:10px;color:var(--muted);line-height:1.8}#speech-rate-output{float:right;color:var(--accent);font-size:11px}
#note-dialog.note-editor{width:min(640px,calc(100vw - 28px));padding:0;overflow:auto;border-radius:19px;max-height:calc(var(--visible-height,100dvh) - 30px);position:fixed;inset:auto;left:50%;top:calc(var(--visual-top,0px) + var(--visible-height,100dvh)/2);transform:translate(-50%,-50%);margin:0}.note-editor-head{display:flex;align-items:start;justify-content:space-between;gap:15px;padding:29px 29px 15px}.note-editor-head h2{font-size:24px;letter-spacing:-.9px;margin-top:10px}.note-source{margin:0 29px;color:var(--muted);font-size:11px;line-height:1.8}#note-dialog #note-quote{margin:20px 29px 0;padding:14px 17px;background:var(--amber-bg);border-left:3px solid var(--amber);border-radius:0 8px 8px 0;color:var(--ink);font-size:14px;line-height:1.8;max-height:155px}.note-title-input{display:block;width:calc(100% - 58px);border:0;background:transparent;font-family:Manrope,sans-serif;font-size:21px;font-weight:600;letter-spacing:-.5px;margin:25px 29px 0;padding:8px 0}.note-title-input::placeholder{color:var(--muted);font-weight:500}#note-text{display:block;width:calc(100% - 58px);border:0;background:transparent;margin:8px 29px 0;padding:8px 0;min-height:180px;font-size:17px;line-height:1.9;resize:vertical;color:var(--ink)}#note-text::placeholder{color:var(--muted)}#note-dialog input:focus,#note-text:focus{outline:none}#note-dialog:focus-within{border-color:var(--accent)}.note-editor-options{display:flex;align-items:center;justify-content:space-between;margin:16px 29px 22px}.note-colors{display:flex;gap:11px;align-items:center}.note-colors button{width:25px;height:25px;border-radius:50%;border:2px solid var(--paper);outline:1px solid var(--line)}[data-note-color=yellow]{background:var(--note-yellow)}[data-note-color=purple]{background:var(--note-purple)}[data-note-color=blue]{background:var(--note-blue)}[data-note-color=green]{background:var(--note-green)}.note-colors button[aria-pressed=true]{outline:2px solid var(--ink);outline-offset:2px}#note-count{font-size:10px;color:var(--muted)}.note-editor-footer{border-top:1px solid var(--line);background:var(--soft);padding:18px 29px;display:flex;align-items:center;justify-content:space-between;gap:15px}.note-editor-footer small{font-size:10px;color:var(--muted);line-height:1.8}.note-editor-footer .button{min-height:42px;font-size:12px}.note-card{border-radius:13px;border-left:4px solid var(--note-color,var(--note-yellow));box-shadow:0 3px 18px #00000003}.note-card h2{font-size:19px;margin:14px 0;letter-spacing:-.5px}.note-card>p{font-size:16px;line-height:1.9}.note-card blockquote{font-size:14px;border-left:2px solid var(--note-color,var(--note-yellow));padding:12px 16px;background:var(--soft);border-radius:0 6px 6px 0}.note-yellow{--note-color:var(--note-yellow)}.note-purple{--note-color:var(--note-purple)}.note-blue{--note-color:var(--note-blue)}.note-green{--note-color:var(--note-green)}.inline-note{background:var(--soft);border:1px solid var(--line);border-left:4px solid var(--note-color,var(--note-yellow));padding:17px 19px;font-size:16px;line-height:1.9;border-radius:8px}.inline-note b{display:block;margin:5px 0;font-size:16px}.inline-note small{font-size:10px}
.practice-heading{margin:5px 0 25px}.practice-heading h1{font-size:34px;letter-spacing:-1px;margin:13px 0}.practice-heading>p{font-size:14px;color:var(--muted);line-height:1.8}.quiz-top-tools{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:24px}.quiz-top-tools>span{font-size:12px;color:var(--muted)}.quiz-filter-menu>summary{font-size:13px;cursor:pointer;padding:10px 0}.quiz-filter-menu>summary>span{font-size:11px;color:var(--muted);margin-left:8px}.quiz-filter-menu .practice-tools{margin:12px 0 0;padding:16px;background:var(--soft);border:1px solid var(--line);border-radius:9px;position:absolute;z-index:21;box-shadow:var(--shadow);max-width:calc(100vw - 40px)}.practice-tools label{font-size:12px}.practice-tools select{font-size:13px;min-height:43px}.quiz-stage{max-width:860px;padding-bottom:130px;scroll-margin-top:86px}.quiz-progress-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:13px}.quiz-progress-head>strong{font-size:15px}.quiz-progress-head>strong>span{color:var(--muted);font-weight:400;font-size:12px}.quiz-progress-track{height:4px;background:var(--line);border-radius:9px;overflow:hidden;margin-bottom:22px}.quiz-progress-track i{display:block;height:100%;background:var(--accent);border-radius:9px}.question-map{position:relative}.question-map>summary{font-size:12px;cursor:pointer;color:var(--muted);padding:10px}.question-map>div{position:absolute;right:0;top:calc(100% + 7px);width:min(420px,calc(100vw - 50px));max-height:55dvh;overflow:auto;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:20px;box-shadow:var(--shadow);z-index:22}.question-map p{font-size:11px;line-height:1.8;color:var(--muted);margin-bottom:16px}.question-map-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:7px}.question-map-grid button{min-height:42px;border:1px solid var(--line);border-radius:7px;font-size:12px}.question-map-grid .current{outline:2px solid var(--accent);outline-offset:1px}.question-map-grid .correct{background:var(--green-bg);color:var(--green)}.question-map-grid .wrong{background:var(--red-bg);color:var(--red)}.question-map-grid .reviewed{background:var(--accent-bg);color:var(--accent)}.quiz-question{border-radius:15px;padding:31px;margin:0;background:var(--paper)}.quiz-question .question-prompt{font-size:var(--reader-font);line-height:1.8;font-weight:600;margin-bottom:24px}.question-prompt:focus{outline:none}.question-meta{font-size:11px;gap:10px;margin-bottom:20px}.question-meta .tag{font-size:10px;padding:5px 8px}.options{gap:11px}.option{font-size:calc(var(--reader-font) - 1px);min-height:57px;padding:14px 17px;border-radius:9px;gap:14px;line-height:1.7}.option>span{width:29px;height:29px;font-size:12px;border-radius:7px}.answer-feedback{font-size:calc(var(--reader-font) - 2px);line-height:1.9;padding:21px 23px;border-radius:10px;margin-top:23px}.answer-feedback strong{font-size:calc(var(--reader-font) - 1px)}.question-actions{gap:10px;margin-top:25px}.question-actions .button{font-size:13px;min-height:42px}.draft-label{font-size:12px;line-height:1.7}.written-draft{font-size:var(--reader-font);line-height:1.9;min-height:170px;padding:17px}.quiz-nav{position:fixed;bottom:17px;left:calc(50% + 120px);transform:translateX(-50%);display:flex;align-items:center;justify-content:space-between;gap:18px;width:min(730px,calc(100vw - 330px));background:var(--paper);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:13px;padding:11px 13px;z-index:30}.quiz-nav .button{min-height:43px;font-size:13px;border-radius:8px}.quiz-nav>span{font-size:12px;color:var(--muted)}.quiz-nav .button:disabled{cursor:default}.quiz-summary{padding:35px;border:1px solid var(--line);border-radius:15px;max-width:860px}.quiz-summary h2{font-size:29px;margin:17px 0 12px;letter-spacing:-.8px}.quiz-summary>p{color:var(--muted);font-size:14px;line-height:1.9}.quiz-results{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:30px 0}.quiz-results>div{background:var(--soft);padding:19px 15px;border-radius:8px}.quiz-results strong{display:block;font-size:26px;margin-bottom:9px}.quiz-results span{font-size:11px;line-height:1.7;color:var(--muted)}
@media(max-width:1250px){.reader-layout{grid-template-columns:1fr}.mobile-toc{position:sticky;top:76px;z-index:18;background:var(--paper);padding:0;max-height:48dvh;overflow:auto;box-shadow:0 4px 12px #00000005}.mobile-toc>summary{font-size:15px;font-weight:550;padding:17px 20px}.mobile-toc a{font-size:15px;line-height:1.8;padding:9px 20px}.mobile-toc a.sub{font-size:14px;padding-left:32px}.mobile-toc a.is-current{color:var(--accent);background:var(--accent-bg)}}
@media(max-width:900px){.quiz-nav{left:calc(50% + 107px);width:calc(100vw - 270px)}#speech-player{left:calc(50% + 107px);width:calc(100vw - 250px)}}
@media(max-width:700px){.top-actions [data-action=search]{display:none}.top-actions{gap:3px}.reader-size-button{font-size:21px;min-width:34px;min-height:36px}.unit-heading>p{font-size:16px}.unit-heading h1{font-size:31px}.unit-tools .muted{font-size:12px}.mobile-toc{top:69px}.mobile-toc summary{font-size:15px;padding:16px}.lesson-section h2{font-size:calc(var(--reader-font) + 5px)}.lesson-section h3{font-size:calc(var(--reader-font) + 2px)}.lesson-copy{font-size:var(--reader-font)}.lesson-section{padding:25px 0}.section-meta{font-size:10px}.read-toggle{font-size:11px}.section-actions{gap:20px;flex-wrap:wrap}.section-actions button{font-size:12px}.example{font-size:calc(var(--reader-font) - 1px);padding:18px}.takeaway,.pitfall{font-size:calc(var(--reader-font) - 1px)}.content{padding-left:18px;padding-right:18px}.practice-heading h1{font-size:29px}.practice-heading>p{font-size:13px}.practice-heading{margin-bottom:20px}.quiz-top-tools{align-items:start;gap:8px}.quiz-top-tools>span{font-size:10px;margin-top:13px}.quiz-filter-menu>summary{font-size:12px;max-width:200px}.quiz-filter-menu>summary>span{font-size:10px;margin:5px 0 0;display:block}.quiz-filter-menu .practice-tools{left:18px;right:18px;max-width:none;gap:12px}.practice-tools select{font-size:13px}.quiz-question{padding:23px 18px;border-radius:12px}.quiz-question .question-prompt{font-size:var(--reader-font)}.option{font-size:calc(var(--reader-font) - 1px);padding:13px 11px;gap:10px;min-height:57px}.option>span{width:26px;height:26px}.question-meta{font-size:10px;gap:7px}.question-meta .question-number{margin-left:0;width:100%;margin-top:2px}.question-actions .button{font-size:12px;min-height:43px}.answer-feedback{padding:19px 16px;font-size:calc(var(--reader-font) - 1px)}.answer-feedback strong{font-size:var(--reader-font)}.quiz-nav{left:50%;width:calc(100vw - 24px);bottom:max(10px,env(safe-area-inset-bottom));padding:10px;gap:10px}.quiz-nav .button{font-size:12px;min-height:44px}.quiz-nav>span{font-size:11px}.quiz-stage{padding-bottom:120px}.quiz-summary{padding:25px 19px}.quiz-summary h2{font-size:25px}.quiz-results{grid-template-columns:1fr 1fr}.quiz-results strong{font-size:25px}.question-map>div{width:calc(100vw - 40px);right:-1px}.note-editor-head{padding:24px 22px 13px}.note-editor-head h2{font-size:22px}.note-source{margin-left:22px;margin-right:22px}#note-dialog #note-quote{margin-left:22px;margin-right:22px;font-size:14px;max-height:110px}.note-title-input{width:calc(100% - 44px);margin:19px 22px 0;font-size:21px}#note-text{width:calc(100% - 44px);margin:7px 22px 0;font-size:17px;min-height:150px}.note-editor-options{margin:18px 22px}.note-editor-footer{padding:16px 22px;display:block}.note-editor-footer .button{width:100%;margin-top:11px;font-size:13px;min-height:44px}.note-editor-footer small{font-size:10px}.note-card>p{font-size:16px}.note-colors button{width:28px;height:28px}.font-choices{gap:6px}.font-choices button span{font-size:10px}#speech-player{left:50%;width:calc(100vw - 20px);bottom:max(10px,env(safe-area-inset-bottom))}.speech-main{padding:12px 9px;gap:5px}.speech-now{gap:7px}.speech-live-dot{width:5px;height:5px}.speech-now small{font-size:7px;letter-spacing:.6px}#speech-label{font-size:11px;max-width:130px}#speech-progress{display:none}#speech-player .button{min-height:39px;font-size:11px;padding:8px 9px}#speech-settings>summary{font-size:11px;padding:8px;min-height:39px}#speech-stop{min-width:28px}.speech-settings-panel{position:fixed;left:0;right:0;bottom:calc(100% + 12px);width:auto;max-height:55dvh;padding:20px}.is-writing .quiz-nav{display:none}}
@media print{.quiz-nav,.reader-size-button,#speech-player,#reader-settings{display:none!important}.lesson-copy{font-size:12px}.reader-layout{display:block}}

#toast{bottom:105px}.mobile-toc[open]{padding-bottom:12px}.quiz-stage{max-width:860px}.note-editor-head .icon-button{font-size:25px}