:root{--primary: #3b82f6;--primary-hover: #2563eb;--primary-light: #eff6ff;--accent: #f59e0b;--accent-light: #fef3c7;--success: #10b981;--bg-app: #f1f5f9;--bg-card: #ffffff;--text-main: #1e293b;--text-muted: #64748b;--border-color: #e2e8f0;--header-height: 56px;--footer-height: 64px;--page-max-width: 640px}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html,body{width:100%;min-height:100%;background-color:var(--bg-app);color:var(--text-main);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;user-select:none;-webkit-user-select:none;overflow-x:hidden}.app-layout{display:flex;flex-direction:column;min-height:100vh;position:relative}.app-header{position:sticky;top:0;z-index:50;height:var(--header-height);background:#fffffff2;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 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rgba(0,0,0,.06)}.page-image{width:100%;height:100%;display:block;object-fit:contain;opacity:0;transition:opacity .2s ease-in}.page-image-loaded{opacity:1}.page-skeleton{position:absolute;top:0;right:0;bottom:0;left:0;background:#f8fafc;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px}.skeleton-pulse{width:60px;height:60px;border-radius:50%;background:#e2e8f0;animation:pulse 1.5s infinite ease-in-out}.skeleton-text{font-size:14px;color:var(--text-muted)}.overlay-layer{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.text-hotspot{position:absolute;pointer-events:auto;cursor:pointer;border-radius:6px;border:1.5px dashed transparent;transition:all .15s ease;z-index:10}.text-hotspot:hover{background:#3b82f614;border-color:#3b82f666}.text-hotspot.hotspot-active{border:2px solid #f59e0b;background:#fef08a66;box-shadow:0 0 14px #f59e0bb3;animation:pulseBorder 1.5s infinite alternate;z-index:25}@keyframes 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slideDrawer{0%{transform:translate(-100%)}to{transform:translate(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.toc-header{padding:16px 20px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between}.toc-title-group{display:flex;align-items:center;gap:10px}.toc-header-icon{color:var(--primary)}.toc-title{font-size:17px;font-weight:700;color:#0f172a}.toc-close-btn{border:none;background:#f1f5f9;border-radius:50%;width:32px;height:32px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-muted)}.toc-close-btn:hover{background:#e2e8f0;color:var(--text-main)}.toc-tabs{display:flex;border-bottom:1px solid var(--border-color);background:#f8fafc}.toc-tab-btn{flex:1;padding:12px 10px;border:none;background:transparent;display:flex;align-items:center;justify-content:center;gap:6px;font-size:13px;font-weight:600;color:var(--text-muted);cursor:pointer;border-bottom:2px solid transparent;transition:all .15s 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var(--border-color);display:inline-flex;align-items:center;gap:6px}.retry-btn.back-btn-secondary:hover{background:var(--bg-app)}.bookshelf-wrapper{width:100%;max-width:1080px;margin:0 auto;padding:36px 24px 48px;min-height:100vh;display:flex;flex-direction:column}.bookshelf-header{background:#fff;border:1px solid var(--border-color);border-radius:16px;padding:22px 28px;box-shadow:0 2px 10px #00000008;margin-bottom:32px}.bookshelf-header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px}.bookshelf-brand{display:flex;align-items:center;gap:16px}.bookshelf-logo-icon{width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,#3b82f6,#1d4ed8);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:0 4px 10px #2563eb40}.bookshelf-title-row{display:flex;align-items:center;gap:10px}.bookshelf-title{font-size:20px;font-weight:700;color:#0f172a;letter-spacing:-.01em}.bookshelf-badge{display:inline-flex;align-items:center;gap:4px;background:#ecfdf5;color:#059669;border:1px solid #a7f3d0;font-size:11px;font-weight:600;padding:2px 8px;border-radius:12px}.bookshelf-subtitle{font-size:13px;color:#64748b;margin-top:3px}.bookshelf-count-tag{background:#f1f5f9;color:#475569;padding:6px 14px;border-radius:20px;font-size:13px;font-weight:600;white-space:nowrap}.bookshelf-main{flex:1}.bookshelf-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:28px}.book-card{background:#fff;border:1px solid var(--border-color);border-radius:16px;overflow:hidden;box-shadow:0 4px 14px #0f172a0a;transition:transform .22s cubic-bezier(.4,0,.2,1),box-shadow .22s cubic-bezier(.4,0,.2,1),border-color .22s ease;cursor:pointer;display:flex;flex-direction:column}.book-card:hover{transform:translateY(-5px);box-shadow:0 16px 32px #0f172a14;border-color:#cbd5e1}.book-card-cover-wrap{position:relative;width:100%;aspect-ratio:1 / 1.414;background:#f8fafc;overflow:hidden;display:flex;align-items:center;justify-content:center;border-bottom:1px solid #f1f5f9}.book-card-cover{width:100%;height:100%;object-fit:cover;transition:transform .35s ease}.book-card:hover .book-card-cover{transform:scale(1.025)}.book-card-page-tag{position:absolute;top:10px;right:10px;background:#0f172ab8;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);color:#fff;font-size:11px;font-weight:600;padding:3px 8px;border-radius:10px;box-shadow:0 2px 6px #00000026}.book-card-cover-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#0f172a40;backdrop-filter:blur(2px);-webkit-backdrop-filter:blur(2px);display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .2s ease}.book-card:hover .book-card-cover-overlay{opacity:1}.overlay-cta{background:#fff;color:#0f172a;font-size:13px;font-weight:600;padding:8px 16px;border-radius:20px;display:inline-flex;align-items:center;gap:6px;box-shadow:0 4px 12px #00000026;transform:translateY(4px);transition:transform .2s ease}.book-card:hover .overlay-cta{transform:translateY(0)}.book-card-info{padding:16px 18px 18px;display:flex;flex-direction:column;gap:8px;flex:1}.book-card-title{font-size:16px;font-weight:700;color:#0f172a;line-height:1.35}.book-card-meta{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}.book-card-publisher{font-size:12px;color:#64748b}.book-card-action-btn{margin-top:auto;width:100%;display:flex;align-items:center;justify-content:center;gap:6px;background:#eff6ff;color:#2563eb;border:1px solid #bfdbfe;font-size:13px;font-weight:600;padding:8px 0;border-radius:10px;cursor:pointer;transition:all .15s ease}.book-card-action-btn:hover{background:#2563eb;color:#fff;border-color:#2563eb}.bookshelf-empty{text-align:center;padding:60px 20px;color:#94a3b8}.empty-icon{margin-bottom:12px;color:#cbd5e1}.empty-title{font-size:16px;font-weight:600;color:#475569;margin-bottom:4px}.empty-desc{font-size:13px;color:#94a3b8}.bookshelf-footer{text-align:center;padding:36px 0 12px;color:#94a3b8;font-size:12px}@media(max-width:640px){:root{--header-height: 52px;--footer-height: 60px}.bookshelf-wrapper{padding:16px 12px 32px}.bookshelf-header{padding:16px;margin-bottom:20px;border-radius:12px}.bookshelf-header-inner{flex-direction:column;align-items:flex-start;gap:12px}.bookshelf-grid{grid-template-columns:repeat(auto-fill,minmax(145px,1fr));gap:14px}.book-card{border-radius:12px}.book-card-info{padding:10px 12px 12px;gap:6px}.book-card-title{font-size:13.5px}.book-card-publisher{font-size:11px}.book-card-action-btn{font-size:12px;padding:6px 0}.main-content{padding:8px 4px;padding-bottom:calc(var(--footer-height) + 16px)}.page-container{border-radius:6px;box-shadow:0 2px 8px #00000014}.header-book-title{font-size:14px;max-width:140px;overflow:hidden;text-overflow:ellipsis}.btn-label{display:none}.header-btn{padding:0 8px;height:34px}.header-btn.icon-only-btn{width:34px}.nav-btn-text{display:none}.nav-btn{padding:0 10px;height:36px}.speaker-btn{width:clamp(20px,4.2cqw,24px);height:clamp(20px,4.2cqw,24px)}.toc-drawer{max-width:85vw}}