:root{--bg:#f2f4f7;--surface:#fff;--text:#1a1f26;--muted:#5c6773;--line:#d5dbe3;--accent:#2f5d50;--reader-font-size:18px;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;font-family:Iowan Old Style,Palatino Linotype,Palatino,Book Antiqua,Georgia,serif;line-height:1.55}:root[data-theme=dark]{--bg:#12151a;--surface:#1c2128;--text:#e8ecf1;--muted:#9aa5b1;--line:#2c3440;--accent:#7eb8a4}:root[data-theme=sepia]{--bg:#e8dfc8;--surface:#f3ead4;--text:#3b2f1e;--muted:#6e5c42;--line:#d2c4a4;--accent:#6b4f2c}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}body{min-width:320px}button{font:inherit;cursor:pointer}button:disabled{opacity:.35;cursor:default}.library{max-width:880px;margin:0 auto;padding:48px 24px 64px}.library-header{margin-bottom:40px}.library-brand{letter-spacing:-.03em;color:var(--accent);margin:0;font-size:2.75rem;font-weight:600}.library-sub{color:var(--muted);margin:8px 0 0;font-size:1.05rem}.library-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:28px;margin:0;padding:0;list-style:none;display:grid}.library-error{color:#a33}.library-book{text-align:left;width:100%;color:inherit;background:0 0;border:none;flex-direction:column;align-items:stretch;gap:14px;padding:0;display:flex}.library-book-cover-wrap{aspect-ratio:2/3;background:var(--surface);border-radius:2px 6px 6px 2px;width:100%;max-width:220px;margin:0 auto;transition:transform .2s,box-shadow .2s;display:block;position:relative;overflow:hidden;box-shadow:0 1px 1px #0000000f,4px 8px 20px #0000002e,inset -1px 0 #ffffff40}.library-book:hover .library-book-cover-wrap{transform:translateY(-3px);box-shadow:0 2px 2px #0000000f,6px 14px 28px #00000038,inset -1px 0 #ffffff40}.library-book-cover{object-fit:contain;object-position:center;width:100%;height:100%;display:block}.library-book-cover-empty{background:linear-gradient(160deg,#d7dde5,#b7c0cb)}.library-book-meta{flex-direction:column;gap:4px;width:100%;max-width:220px;margin:0 auto;padding:0 4px;display:flex}.library-card-title{font-size:1.05rem;font-weight:600;line-height:1.3}.library-card-en{color:var(--muted);font-size:.88rem;line-height:1.35}.library-card-author{color:var(--muted);margin-top:2px;font-size:.85rem}.library-card-action{color:var(--accent);margin-top:8px;font-family:Avenir Next,Segoe UI,sans-serif;font-size:.92rem;font-weight:600}.player{background:var(--surface);justify-content:center;align-items:center;gap:8px;padding:8px 12px 4px;display:flex}.player-view,.player-transport{flex-wrap:wrap;justify-content:center;align-items:center;gap:4px;display:flex}.player-transport button{min-width:2.1rem;padding:6px 8px}.player button{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:4px;padding:6px 12px;font-family:Avenir Next,Segoe UI,sans-serif;font-size:.9rem}.player-main{min-width:44px;font-size:1.05rem}.toc{z-index:40;justify-content:flex-end;display:flex;position:fixed;inset:0}.toc-backdrop{cursor:pointer;background:#14181e59;border:none;position:absolute;inset:0}.toc-panel{background:var(--surface);border-left:1px solid var(--line);flex-direction:column;width:min(320px,88vw);height:100%;display:flex;position:relative;box-shadow:-8px 0 24px #0000001f}.toc-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:flex-start;gap:8px;padding:12px 12px 10px;display:flex}.toc-tabs{flex-wrap:wrap;flex:1;gap:4px;min-width:0;display:flex}.toc-tab{border:1px solid var(--line);background:var(--surface);color:var(--text);font:inherit;cursor:pointer;border-radius:4px;padding:5px 8px;font-family:Avenir Next,Segoe UI,sans-serif;font-size:.78rem}.toc-tab.is-active{border-color:var(--accent);color:var(--accent);font-weight:600}.toc-close{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:4px;padding:4px 10px;font-size:.9rem}.toc-nav{flex-direction:column;gap:2px;padding:10px;display:flex;overflow:auto}.toc-item{text-align:left;color:var(--text);font:inherit;cursor:pointer;background:0 0;border:none;border-radius:4px;padding:12px;font-size:.98rem}.toc-item:hover{background:color-mix(in srgb, var(--accent) 10%, transparent)}.toc-item.is-current{color:var(--accent);background:color-mix(in srgb, var(--accent) 12%, transparent);font-weight:600}.toc-empty{color:var(--muted);margin:12px;font-size:.92rem;line-height:1.45}.toc-mark{flex-direction:column;flex:1;align-items:flex-start;gap:4px;min-width:0;display:flex}.toc-mark-row{align-items:flex-start;gap:2px;display:flex}.toc-mark-remove{color:var(--muted);font:inherit;cursor:pointer;background:0 0;border:none;border-radius:4px;flex-shrink:0;margin-top:8px;padding:6px 10px;font-size:.9rem}.toc-mark-remove:hover{color:var(--text);background:color-mix(in srgb, var(--accent) 10%, transparent)}.toc-mark-section{color:var(--muted);letter-spacing:.02em;font-size:.78rem}.toc-mark-preview{font-size:.92rem;line-height:1.4}.toc-note-body{color:var(--text);padding:4px 12px 24px;font-size:.95rem;line-height:1.5}.toc-note-body p{white-space:pre-line;margin:0 0 .9em}.settings-title{margin:0;font-size:1.1rem;font-weight:600}.settings-body{flex-direction:column;gap:18px;padding:16px 14px 28px;display:flex;overflow:auto}.settings-row{flex-direction:column;align-items:flex-start;gap:8px;display:flex}.settings-label{color:var(--muted);letter-spacing:.04em;text-transform:uppercase;font-family:Avenir Next,Segoe UI,sans-serif;font-size:.78rem}.settings-controls{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.settings-body button{border:1px solid 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12px;font-size:.9rem}.reader-controls{align-items:center;gap:6px;display:flex}.reader-font-size{text-align:center;min-width:1.5rem;color:var(--muted);font-variant-numeric:tabular-nums;font-family:Avenir Next,Segoe UI,sans-serif;font-size:.85rem}.reader-dock{border-top:1px solid var(--line);background:var(--surface);flex-shrink:0}.reader-nav-bottom{justify-content:space-between;align-items:center;gap:12px;padding:8px 12px 10px;display:flex}.reader-progress{color:var(--muted);font-variant-numeric:tabular-nums;text-align:center;font-family:Avenir Next,Segoe UI,sans-serif;font-size:.85rem}.reader-loading,.reader-error{text-align:center;padding:48px 24px}.reader-spread{flex:1;grid-template-columns:1fr 1fr;gap:0;width:100%;max-width:1200px;min-height:0;margin:0 auto;padding:0 12px 8px;display:grid;overflow:hidden}.reader-spread.is-single{grid-template-columns:1fr;max-width:720px}.reader-spread.is-single .reader-col-en{border-right:none}.reader-col{min-width:0;min-height:0;padding:8px 20px 16px;overflow:hidden}.reader-col-en{border-right:1px solid var(--line)}.reader-col-label{letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 16px;font-family:Avenir Next,Segoe UI,sans-serif;font-size:.75rem;font-weight:600}.reader-body{font-size:var(--reader-font-size);line-height:1.7}.reader-body p{border-radius:4px;margin:0 0 1.1em;transition:background-color .2s}.reader-body p.is-markable{cursor:pointer}.reader-body p.is-marked{background:color-mix(in srgb, var(--accent) 9%, transparent);box-shadow:inset 3px 0 0 var(--accent);margin-left:-.45em;padding-left:.45em}.reader-body p.is-speaking{background:color-mix(in srgb, var(--accent) 14%, transparent);-webkit-box-decoration-break:clone;box-decoration-break:clone;margin-left:-.35em;margin-right:-.35em;padding:.15em .35em}.reader-body p.is-marked.is-speaking{box-shadow:inset 3px 0 0 var(--accent)}.reader-image{border:1px solid var(--line);max-width:100%;height:auto;margin:1em 0;display:block}@media 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