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button{background:var(--accent);color:#fff;border:0;border-radius:9px;min-height:36px;padding:0 13px;font-weight:700}.quick-pdf-preview{border:1px solid var(--border-strong);background:#dfe2dd;border-radius:10px;grid-template-rows:auto minmax(0,1fr);height:100%;min-height:0;display:grid;overflow:hidden;box-shadow:0 12px 30px #181e1a1a}.quick-pdf-toolbar{border-bottom:1px solid var(--border);background:#fffffff7;justify-content:center;align-items:center;gap:7px;min-height:45px;padding:6px 10px;display:flex}.quick-page-control{border:1px solid var(--border);background:var(--surface);min-height:32px;color:var(--muted);border-radius:8px;align-items:center;gap:6px;padding:0 9px;font-size:11px;display:flex}.quick-page-control input{background:var(--surface-muted);width:38px;height:24px;color:var(--text);text-align:center;border:0;border-radius:5px;outline:none;padding:0 4px}.quick-pdf-canvas{background-color:#dfe2dd;background-image:linear-gradient(45deg,#ffffff1a 25%,#0000 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var(--border);background:var(--surface);border-radius:8px;place-items:center;width:30px;height:30px;font-size:21px;line-height:1;display:grid}.collapsed-panel-rail small{writing-mode:vertical-rl;letter-spacing:.08em;text-transform:uppercase;font-size:10px;font-weight:750;transform:rotate(180deg)}.title-panel-heading-actions{color:var(--muted);flex:none;align-items:center;gap:8px;font-size:11px;display:flex}.title-list-panel.collapsed{border-right:1px solid var(--border);background:#fafaf8}.compact-book-row{min-height:64px;padding:4px;display:block}.compact-book-title{width:100%;min-height:56px}.compact-book-title[aria-pressed=true] .compact-book-copy strong{color:var(--accent)}.book-preview-panel{min-width:0;min-height:0;overflow:hidden}.book-preview-body{min-width:0;min-height:0;padding:0;position:relative;overflow:hidden}.book-preview-body>.react-pdf-viewer{height:100%;box-shadow:none;border:0;border-radius:0}.pdf-document-scroll{overscroll-behavior:contain;scroll-behavior:smooth;min-width:0;min-height:0;position:relative;overflow:auto}.pdf-continuous-pages{flex-direction:column;align-items:center;gap:24px;width:max-content;min-width:100%;display:flex}.pdf-continuous-page{flex:none}.pdf-continuous-page .react-pdf__Page{position:relative}.pdf-continuous-page .react-pdf__Page__canvas,.pdf-continuous-page .react-pdf__Page__textContent,.pdf-continuous-page .react-pdf__Page__annotations{display:block}@media (max-width:900px){.app-shell{height:auto;min-height:100vh;padding:calc(var(--topbar-height) + 8px) 8px 8px;overflow:visible}.library-browser-workspace{grid-template-columns:1fr!important}.panel-resizer{display:none}.library-side-panel.collapsed{min-height:44px}.collapsed-panel-rail{flex-direction:row;justify-content:flex-start;min-height:44px;padding:6px 10px}.collapsed-panel-rail small{writing-mode:horizontal-tb;transform:none}.book-preview-panel{min-height:78vh}}.pdf-skeleton-overlay{opacity:1;pointer-events:none;z-index:5;background:var(--surface);place-items:start center;padding:24px 16px;transition:opacity .2s;display:grid;position:absolute;inset:0}.pdf-loading-stage{flex-direction:column;align-items:center;gap:16px;width:100%;display:flex}.pdf-page-skeleton{width:var(--pdf-page-width,min(100%, 860px));aspect-ratio:8.5/11;background:color-mix(in srgb, var(--muted) 8%, #fff);border:1px solid var(--border);max-width:100%;padding:clamp(24px,5vw,64px);position:relative;overflow:hidden;box-shadow:0 1px 2px #0000000d,0 8px 28px #00000012}.pdf-skeleton-shimmer{background:linear-gradient(90deg,#0000,#ffffff8c,#0000);animation:1.6s ease-in-out infinite pdf-skeleton-shimmer;position:absolute;inset:0;transform:translate(-100%)}@keyframes pdf-skeleton-shimmer{to{transform:translate(100%)}}.pdf-loading-message{color:var(--muted);text-align:center;font-size:13px}.pdf-continuous-pages{transition:opacity .22s}.pdf-skeleton-overlay.is-hidden{opacity:0}@media (prefers-reduced-motion:reduce){.pdf-skeleton-shimmer{animation:none}.pdf-skeleton-overlay,.pdf-continuous-pages,.library-browser-workspace{transition:none}}