:root{color-scheme:light;--bg:#f2f5fa;--paper:#fff;--ink:#172c44;--muted:#51647a;--border:#cbd5e2;--accent:#125ea4;--accent-soft:#e5f0ff;--button:#fff;--nav:#132b49;--read-size:1.5rem;--read-font:Arial,sans-serif;--leading:1.85;--tracking:0em;--measure:65ch;--focus:#b75500}
:root[data-theme=dark]{color-scheme:dark;--bg:#0c1421;--paper:#172337;--ink:#f1f5fb;--muted:#b8c8dd;--border:#465b77;--accent:#90c6ff;--accent-soft:#233e60;--button:#1e304a;--nav:#0a111e;--focus:#ffcc75}
:root[data-theme=contrast]{color-scheme:dark;--bg:#000;--paper:#000;--ink:#fff;--muted:#fff;--border:#fff;--accent:#ffef70;--accent-soft:#222;--button:#000;--nav:#000;--focus:#ffef70}
*{box-sizing:border-box}html{scroll-behavior:auto;scrollbar-gutter:stable}html.dialog-open{overflow:hidden}body{margin:0;background:var(--bg);color:var(--ink);font:1.0625rem/1.5 Arial,sans-serif}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button,input,select{border:1px solid var(--border);border-radius:9px;background:var(--button);color:var(--ink);min-height:48px}button{padding:.55rem 1rem;cursor:pointer;font-weight:600;line-height:1.4}button:hover{border-color:var(--accent);background:var(--accent-soft)}button:disabled{opacity:.5;cursor:default}input,select{padding:.6rem .8rem;max-width:100%}select{width:100%}a{color:var(--accent);text-underline-offset:.2em}a:hover{text-decoration-thickness:2px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--focus);outline-offset:4px}p{margin:.65em 0 1em}h1,h2,h3{line-height:1.3;overflow-wrap:anywhere}h1{font-size:1.9rem;margin:.5rem 0 1.3rem;max-width:45ch}h2{font-size:1.5rem}h3{font-size:1.15rem}strong{font-weight:700}[hidden]{display:none!important}.skip{position:fixed;z-index:20;top:-100px;left:1rem;padding:1rem;background:var(--paper)}.skip:focus{top:1rem}.topbar{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1rem 2rem;background:var(--paper);border-bottom:1px solid var(--border);position:static}.brand{display:flex;align-items:center;gap:.85rem;text-decoration:none;color:var(--ink);font-weight:700;font-size:1.15rem;line-height:1.35}.brand small{display:block;font-weight:400;color:var(--muted);font-size:.875rem;margin-top:.1rem}.book-icon{display:grid;place-items:center;width:44px;height:48px;background:var(--nav);color:white;border-radius:10px;font-size:2rem}.top-controls{display:flex;align-items:center;gap:.6rem;flex-wrap:wrap}.size-group{display:flex;align-items:center;border:1px solid var(--border);border-radius:9px;background:var(--button)}.size-group button{border:0;background:transparent;font-size:1.2rem;min-width:52px}.size-group output{font-size:.9rem;min-width:2.3rem;text-align:center;color:var(--muted);font-variant-numeric:tabular-nums}.workspace{display:grid;grid-template-columns:304px minmax(0,1fr);max-width:1800px;margin:auto}.sidebar{border-right:1px solid var(--border);padding:2rem 1.15rem;background:var(--paper)}.sidebar-heading{padding:0 .6rem 1rem}.eyebrow{font-size:.82rem;font-weight:700;letter-spacing:.11em;color:var(--accent);margin:0 0 .5rem}.muted{color:var(--muted)}.small{font-size:.9rem}.sidebar nav h2,#mobileToc h2{font-size:.85rem;text-transform:uppercase;letter-spacing:.1em;margin:1.6rem .6rem .65rem;color:var(--muted)}.toc-link{display:flex;width:100%;gap:.7rem;align-items:flex-start;text-align:left;border:0;background:transparent;font-size:.99rem;font-weight:400;padding:.85rem .6rem;margin:.2rem 0;line-height:1.45}.toc-link[aria-current=page]{background:var(--accent-soft);color:var(--accent);font-weight:700;box-shadow:inset 3px 0 var(--accent)}.topic-number{flex:0 0 25px;font-variant-numeric:tabular-nums;font-weight:700}.toc-link small{display:block;color:var(--muted);font-size:.8rem;margin-top:.3rem;font-weight:400}.sidebar-footer{border-top:1px solid var(--border);margin:2rem .6rem 0;padding-top:1.3rem;display:grid;gap:1rem;font-size:.93rem}main{min-width:0;padding:1.5rem clamp(1rem,3vw,3rem) 2rem}.reader-actions{display:flex;gap:.6rem;flex-wrap:wrap;margin-bottom:1.7rem}.mobile-menu{display:none}.reading-header{max-width:1120px;margin:auto}.page-toolbar{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:.85rem;flex-wrap:wrap}.page-toolbar strong{font-size:1rem}.page-toolbar span{display:block}#pageForm{display:flex;align-items:center;gap:.5rem;font-size:.9rem}#pageInput{width:5.1rem}progress{appearance:none;-webkit-appearance:none;height:5px;width:100%;border:0;background:var(--border);display:block;margin-bottom:1.5rem;border-radius:5px}progress::-webkit-progress-bar{background:var(--border);border-radius:5px}progress::-webkit-progress-value{background:var(--accent);border-radius:5px}progress::-moz-progress-bar{background:var(--accent)}#reading{max-width:1120px;min-height:20rem;margin:auto;padding:clamp(1.1rem,4vw,3.2rem);background:var(--paper);border:1px solid var(--border);border-radius:14px;font-family:var(--read-font);font-size:var(--read-size);line-height:var(--leading);letter-spacing:var(--tracking);overflow-wrap:anywhere;scroll-margin-top:1rem}#reading>:not(figure){max-width:var(--measure);margin-left:auto;margin-right:auto}#reading p{margin-top:0;margin-bottom:1.25em}#reading h2{font-size:1.22em;line-height:1.45;margin-top:1.3em;margin-bottom:1em}#reading h2:first-child{margin-top:0}#reading h3{font-size:1.04em;line-height:1.5;margin:1.4em auto .8em}#reading .inset{border-left:3px solid var(--border);padding-left:1em}#reading figure{max-width:100%;margin:1.5rem auto 2rem;text-align:center}#reading figure img{max-height:620px;object-fit:contain;display:block;max-width:100%;width:auto;height:auto;margin:auto}figcaption{font: .875rem/1.5 Arial,sans-serif;color:var(--muted);margin-top:.6rem;letter-spacing:0}.figure-button{padding:0;border:1px solid var(--border);background:#fff;display:block;max-width:100%;margin:auto;border-radius:4px;overflow:hidden}.figure-button img{display:block;max-width:100%;height:auto}.original-details{margin:1.5rem auto;max-width:1120px;background:var(--paper);border:1px solid var(--border);border-radius:10px;padding:1rem 1.25rem}.original-details summary{cursor:pointer;font-weight:600;min-height:32px;display:list-item}.original-details img{max-height:850px;width:auto;object-fit:contain}.page-navigation{display:flex;align-items:center;justify-content:space-between;gap:.65rem;max-width:1120px;margin:1.5rem auto}.primary{background:var(--accent);border-color:var(--accent);color:var(--paper)}.primary:hover{background:var(--ink);color:var(--paper)}.completion{display:flex;gap:1rem;align-items:center;flex-wrap:wrap;padding-top:1.5rem;border-top:1px solid var(--border);max-width:1120px;margin:auto}.completion [aria-pressed=true]{background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}.reader-footer{max-width:1120px;margin:2rem auto 0;color:var(--muted);font-size:.875rem;line-height:1.65}.reader-footer p{margin:.25rem 0}.text-button{border:0;padding:.5rem 0;background:transparent;color:var(--accent);text-decoration:underline;font-size:inherit}.status{font-size:1rem;overflow-wrap:anywhere}.status:not(:empty){padding:.8rem 1rem;margin:0 0 1rem;border:1px solid var(--border);border-radius:8px;background:var(--accent-soft);color:var(--ink)}
dialog{color:var(--ink);background:var(--paper);border:1px solid var(--border);border-radius:16px;width:min(740px,calc(100% - 2rem));max-width:calc(100% - 1rem);max-height:calc(100vh - 2rem);max-height:calc(100dvh - 2rem);padding:0;overflow:hidden;overscroll-behavior:contain}
dialog[open]{display:flex;flex-direction:column}dialog::backdrop{background:#081628b8}
.dialog-head{display:flex;flex:none;align-items:center;justify-content:space-between;gap:1rem;margin:0;padding:1rem 1.25rem;border-bottom:1px solid var(--border);background:var(--paper)}
.dialog-body{min-height:0;min-width:0;overflow:auto;overscroll-behavior:contain;padding:1.25rem;scroll-padding-block:1rem;overflow-wrap:anywhere}.dialog-body:focus-visible{outline-offset:-4px}
.dialog-head h2{min-width:0;margin:0;line-height:1.3;font-size:1.4rem}.dialog-head button{flex-shrink:0}.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem 1rem}label{display:block;font-size:1rem;font-weight:600}label input,label select{margin-top:.5rem}label output{float:right;color:var(--muted);font-size:.9rem}input[type=range]{width:100%;accent-color:var(--accent);padding:0;border:0}.settings-grid+p{margin:1.5rem 0}.search-field{display:flex;gap:.5rem;margin-top:.5rem}.search-field input{flex:1;min-width:0}#searchResults{display:grid;gap:.75rem}.search-result{text-align:left;font-weight:400;width:100%;padding:1rem}.search-result strong{display:block;color:var(--accent);margin-bottom:.4rem}.search-result span{display:block;line-height:1.6}mark{background:#ffe184;color:#182536}#mediaTopic{margin-top:.5rem;font-size:1rem}.media-item{border-top:1px solid var(--border);padding:1rem 0}.media-item h3{font-size:1.1rem}.media-item .media-links{display:flex;align-items:center;flex-wrap:wrap;gap:1rem}.media-frame{width:100%;aspect-ratio:16/9;border:0;border-radius:8px;margin-top:1rem;background:#111}.podcast-frame{aspect-ratio:auto;height:170px;background:var(--paper)}.image-dialog{width:min(1200px,calc(100% - 1rem))}.image-controls{display:flex;align-items:center;gap:1rem}.image-controls output{min-width:3rem}#imageScroller{width:100%;max-height:65dvh;overflow:auto;background:#e8e8e8;border:1px solid var(--border);margin-top:1rem}#zoomImage{display:block;width:100%;max-width:none;height:auto}.speaking-block{outline:3px solid var(--accent);outline-offset:8px;background:var(--accent-soft)}.noscript{padding:2rem}.no-content{font:1rem/1.7 Arial,sans-serif;color:var(--muted)}
#topicLabel{scroll-margin-top:1rem}
.media-frame:not(.podcast-frame){min-height:200px}.local-media-hint{padding:1rem;border:1px solid var(--border);border-radius:10px;background:var(--accent-soft);font-size:1rem}.local-media-hint input{width:100%;margin:.5rem 0}.local-media-hint button{margin-top:.5rem}.local-media-hint p{margin:.65rem 0}
.download-bar{display:flex;gap:1rem;align-items:center;justify-content:space-between;padding:1rem 2rem;background:var(--accent-soft);border-bottom:1px solid var(--border)}.download-bar small{display:block;color:var(--muted);font-size:.9rem;margin-top:.2rem}.download-button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:.65rem 1rem;background:var(--accent);border:1px solid var(--accent);color:var(--paper);border-radius:9px;text-decoration:none;font-weight:700;white-space:nowrap}.download-button:hover{background:var(--ink);color:var(--paper)}@media(max-width:570px){.download-bar{padding:1rem;align-items:stretch;flex-direction:column}}

@media(min-width:1450px){.workspace{grid-template-columns:330px minmax(0,1fr)}}
@media(max-width:1050px){.workspace{grid-template-columns:250px minmax(0,1fr)}.sidebar{padding:1.5rem .7rem}.topbar{padding:.8rem 1rem}.brand{font-size:1rem}.brand small{font-size:.85rem}.top-controls button{padding:.5rem .7rem}main{padding:1.3rem 1.2rem}h1{font-size:1.6rem}}
@media(max-width:850px){.workspace{display:block}.sidebar{display:none}.mobile-menu{display:block}.topbar{gap:.7rem;flex-wrap:wrap}.brand{flex:1}.top-controls{gap:.45rem}.top-controls button{font-size:.95rem}.size-group button{font-size:1.15rem}.reader-actions{gap:.5rem}#reading{padding:1.5rem}main{padding:1.25rem 1.2rem}.reading-header h1{font-size:1.5rem}.reader-actions button{font-size:.95rem}}
@media(max-width:570px){.topbar{position:static;padding:1rem;align-items:flex-start}.brand{flex-basis:100%}.top-controls{width:100%;justify-content:space-between}.top-controls button{padding:.5rem .65rem}.size-group button{min-width:44px}.size-group output{min-width:1.8rem}main{padding:1rem .75rem}#reading{padding:1.1rem;border-radius:10px}#reading .inset{padding-left:.6em}.reading-header h1{font-size:1.4rem}.eyebrow{font-size:.8rem}.reader-actions{display:grid;grid-template-columns:1fr 1fr}.reader-actions button{padding:.55rem .5rem}.page-toolbar{align-items:flex-start}#pageForm{width:100%;justify-content:flex-start}#pageForm label{font-size:.95rem}.page-navigation{flex-wrap:wrap}.page-navigation button{font-size:.95rem;padding:.6rem .7rem}#navPage{font-size:.8rem}.settings-grid{grid-template-columns:1fr}.dialog-head{gap:.7rem}.dialog-head h2{font-size:1.25rem}dialog{width:calc(100% - 1rem);max-height:calc(100dvh - 1rem);border-radius:12px}.dialog-head,.dialog-body{padding:1rem}.search-field{flex-wrap:wrap}.search-field input{flex-basis:100%}.completion{align-items:stretch;flex-direction:column}.completion button{width:100%}.original-details{padding:1rem}.image-controls{gap:.6rem}.image-controls button{padding:.5rem .7rem}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
@media print{.topbar,.sidebar,.reader-actions,.page-toolbar,progress,.original-details,.page-navigation,.completion,.reader-footer,dialog,.status{display:none!important}.workspace{display:block}body,main,#reading{background:#fff!important;color:#000!important;padding:0;border:0}#reading{font-size:14pt;max-width:none}h1{font-size:18pt}figure img{max-height:10cm!important}}

/* Controls reflow with browser zoom and large system text. Dialog headings occupy
   their own row; only the body scrolls, so no heading can cover a player. */
button,a,input,select,summary{touch-action:manipulation}
button{white-space:normal;overflow-wrap:anywhere}
.brand,.top-controls,.top-controls>*,.settings-grid>*,.page-toolbar>*{min-width:0}
.book-icon{flex-shrink:0}.topbar{flex-wrap:wrap}.top-controls{max-width:100%}
.toc-link>span:last-child{min-width:0;overflow-wrap:anywhere}
#pageForm{flex-wrap:wrap}#pageForm label{white-space:nowrap}
.page-navigation{scroll-margin-block:1rem}.image-controls{flex-wrap:wrap}
.download-button{white-space:normal;text-align:center}
.local-media-hint{margin:1rem 0}.local-media-hint summary{cursor:pointer;min-height:44px;align-content:center;font-weight:700}.local-media-hint[open] summary{margin-bottom:.75rem}
.media-frame{display:block;scroll-margin-block:1rem}.media-frame:not(.podcast-frame){max-height:max(200px,calc(100dvh - 9rem))}#mediaTopic{min-width:0;text-overflow:ellipsis}
.reader-footer a,.sidebar-footer a{display:inline-block;padding:.6rem 0;min-height:44px}
.original-details summary{min-height:44px}.image-controls output{font-variant-numeric:tabular-nums}
.media-links a{display:inline-flex;align-items:center;min-height:44px}
@media(max-width:570px){.page-navigation{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}#navPage{grid-row:1;grid-column:1/-1;text-align:center}.page-navigation button{min-width:0}.dialog-head{gap:.5rem}.dialog-head h2{font-size:1.15rem}.dialog-head button{padding:.5rem .75rem}.dialog-body{padding:1rem}.top-controls{justify-content:flex-start}}
@media(max-height:480px){dialog{max-height:calc(100dvh - 1rem)}.dialog-head{padding:.5rem .8rem}.dialog-head h2{font-size:1.1rem}.dialog-body{padding:.8rem}#imageScroller{max-height:50dvh}}
@media print{.download-bar,.skip,#backToTop{display:none!important}}