:root{--bg:#f4f5f7;--surface:#fff;--surface-2:#eceef1;--text:#1f2328;--text-muted:#6b7280;--border:#e2e5ea;--accent:#2563eb;--accent-contrast:#fff;--reader-bg:#fff;--shadow:0 8px 30px #0f172a1f;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=sepia]{--bg:#ece0c8;--surface:#fbf5e6;--surface-2:#f1e5cc;--text:#5b4636;--text-muted:#8a7a63;--border:#e0d2b4;--accent:#9a5b13;--accent-contrast:#fff;--reader-bg:#f6ecd6;--shadow:0 8px 30px #5b46362e;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=dark]{--bg:#0f1114;--surface:#1a1d21;--surface-2:#23272c;--text:#e6e8eb;--text-muted:#9aa0a8;--border:#2a2e34;--accent:#6ea8fe;--accent-contrast:#0f1114;--reader-bg:#121417;--shadow:0 8px 30px #00000080;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}html,body,#root{height:100%}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}button{font:inherit;color:inherit}.app{flex-direction:column;height:100%;display:flex}.primary-btn{background:var(--accent);color:var(--accent-contrast);cursor:pointer;border:none;border-radius:10px;padding:10px 18px;font-weight:600;transition:filter .15s}.primary-btn:hover:not(:disabled){filter:brightness(1.08)}.primary-btn:disabled{opacity:.6;cursor:default}.ghost-btn{border:1px solid var(--border);width:100%;color:var(--text);cursor:pointer;background:0 0;border-radius:10px;margin-top:8px;padding:10px}.ghost-btn:hover{background:var(--surface-2)}.icon-btn{cursor:pointer;width:38px;height:38px;color:var(--text);background:0 0;border:none;border-radius:10px;place-items:center;font-size:18px;display:grid}.icon-btn:hover,.icon-btn.active{background:var(--surface-2)}.library{flex:1;width:100%;max-width:1100px;margin:0 auto;padding:32px 24px 64px;overflow-y:auto}.library-top{justify-content:space-between;align-items:center;gap:16px;margin-bottom:28px;display:flex}.library-actions{flex-shrink:0;align-items:center;gap:8px;display:flex}.library-title{margin:0;font-size:26px}.library-subtitle{color:var(--text-muted);margin:4px 0 0;font-size:14px}.book-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:24px 20px;margin:0;padding:0;list-style:none;display:grid}.book-card{flex-direction:column;gap:10px;display:flex;position:relative}.book-cover{aspect-ratio:2/3;border:1px solid var(--border);background:var(--surface-2);cursor:pointer;width:100%;box-shadow:var(--shadow);border-radius:12px;place-items:center;padding:0;transition:transform .15s;display:grid;overflow:hidden}.book-cover:hover{transform:translateY(-3px)}.book-cover img{object-fit:cover;width:100%;height:100%;display:block}.book-cover-fallback{color:var(--text-muted);font-size:48px;font-weight:700}.book-info{min-width:0}.book-open{text-align:left;cursor:pointer;background:0 0;border:none;flex-direction:column;gap:2px;width:100%;padding:0;display:flex}.book-title{-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:15px;font-weight:600;line-height:1.3;display:-webkit-box;overflow:hidden}.book-author{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:13px;overflow:hidden}.book-meta{color:var(--text-muted);justify-content:space-between;gap:8px;margin-top:8px;font-size:12px;display:flex}.book-progress{background:var(--surface-2);border-radius:999px;height:4px;margin-top:6px;overflow:hidden}.book-progress-fill{background:var(--accent);height:100%;transition:width .2s}.delete-btn{color:#fff;cursor:pointer;opacity:0;background:#0009;border:none;border-radius:50%;width:28px;height:28px;transition:opacity .15s;position:absolute;top:8px;right:8px}.book-card:hover .delete-btn,.delete-btn:focus-visible{opacity:1}.empty-state{text-align:center;border:2px dashed var(--border);border-radius:18px;padding:80px 24px}.empty-icon{font-size:52px}.empty-state h2{margin:16px 0 6px;font-size:20px}.empty-state p{color:var(--text-muted);margin:0 0 22px}.empty-actions{flex-direction:column;gap:10px;max-width:260px;margin:0 auto;display:flex}.empty-actions .ghost-btn{margin-top:0}.reader{background:var(--reader-bg);flex-direction:column;height:100%;display:flex;position:relative}.reader-top{border-bottom:1px solid var(--border);background:var(--surface);z-index:20;align-items:center;gap:10px;padding:8px 12px;transition:opacity .2s;display:flex;position:relative}.reader-heading{flex-direction:column;flex:1;min-width:0;line-height:1.25;display:flex}.reader-title{white-space:nowrap;text-overflow:ellipsis;font-size:15px;font-weight:600;overflow:hidden}.reader-author{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:12px;overflow:hidden}.reader-actions{gap:4px;display:flex}.reader-body{background:var(--reader-bg);flex:1;min-height:0;display:flex;position:relative}.reader-stage{flex:1;width:100%;min-width:0;margin:0 auto;position:relative}.reader-viewer{background:var(--reader-bg);width:100%;height:100%}.reader-grain{z-index:5;pointer-events:none;mix-blend-mode:multiply;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");background-repeat:repeat;background-size:180px 180px;position:absolute;inset:0}:root[data-theme=dark] .reader-grain{mix-blend-mode:screen}.reader-overlay{z-index:20;background:var(--reader-bg);color:var(--text-muted);place-items:center;display:grid;position:absolute;inset:0}.reader-overlay.error{color:#dc2626}.word-popup{z-index:60;background:var(--surface);width:max-content;max-width:min(320px,100vw - 24px);color:var(--text);border:1px solid var(--border);box-shadow:var(--shadow);text-align:left;border-radius:12px;padding:12px 14px;font-size:13px;line-height:1.45;position:fixed;transform:translate(-50%,calc(-100% - 10px))}.word-popup.below{transform:translate(-50%,10px)}.word-popup-head{align-items:baseline;gap:8px;margin-bottom:6px;display:flex}.word-popup-word{font-size:15px;font-weight:700}.word-popup-phonetic{color:var(--text-muted);font-size:12px}.word-popup-close{color:var(--text-muted);cursor:pointer;background:0 0;border:none;margin-left:auto;padding:0 2px;font-size:16px;line-height:1}.word-popup-close:hover{color:var(--text)}.word-popup-note{color:var(--text-muted);margin:0}.word-popup-skeleton{flex-direction:column;gap:8px;padding:2px 0;display:flex}.skeleton-line{background:linear-gradient(90deg, var(--surface-2) 25%, var(--border) 37%, var(--surface-2) 63%);background-size:400% 100%;border-radius:999px;height:10px;animation:1.4s infinite skeleton-shimmer;display:block}.skeleton-line.short{width:60%}@keyframes skeleton-shimmer{0%{background-position:100% 0}to{background-position:0 0}}.word-popup-list{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.word-popup-list li{flex-direction:column;gap:2px;display:flex}.word-popup-pos{color:var(--text-muted);text-transform:lowercase;font-size:11px}.word-popup-example{color:var(--text-muted);font-size:12px;font-style:italic}.reader-sidebar{background:var(--surface);border-right:1px solid var(--border);z-index:30;flex-shrink:0;width:300px;padding:18px 16px 40px;position:relative;overflow-y:auto}.settings-sidebar{border-right:none;border-left:1px solid var(--border);width:280px}.sidebar-title{text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin:0 0 14px;font-size:13px}.reader-bottom{border-top:1px solid var(--border);background:var(--surface);z-index:20;align-items:center;gap:12px;padding:8px 16px;transition:opacity .2s;display:flex;position:relative}.reader.chrome-hidden .reader-top,.reader.chrome-hidden .reader-bottom{opacity:0;pointer-events:none}.nav-btn{border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:10px;place-items:center;width:38px;height:38px;font-size:20px;line-height:1;display:grid}.nav-btn:hover{background:var(--surface-2)}.progress-track{background:var(--surface-2);border-radius:999px;flex:1;height:6px;overflow:hidden}.progress-fill{background:var(--accent);height:100%;transition:width .2s}.progress-label{color:var(--text-muted);text-align:right;min-width:38px;font-size:12px}.toc-list{margin:0;padding:0;list-style:none}.toc-list[data-depth="1"],.toc-list[data-depth="2"],.toc-list[data-depth="3"]{padding-left:14px}.toc-item{text-align:left;cursor:pointer;width:100%;color:var(--text);background:0 0;border:none;border-radius:8px;padding:8px 10px;font-size:14px;line-height:1.4;display:block}.toc-item:hover{background:var(--surface-2)}.toc-item.active{background:var(--surface-2);color:var(--accent);font-weight:600}.toc-empty{color:var(--text-muted);font-size:14px}.settings{flex-direction:column;gap:20px;display:flex}.setting-group{flex-direction:column;gap:8px;display:flex}.setting-row{justify-content:space-between;align-items:baseline;display:flex}.setting-label{font-size:14px;font-weight:500}.setting-value{color:var(--text-muted);font-size:13px}.setting-group input[type=range]{width:100%;accent-color:var(--accent)}.setting-group select{border:1px solid var(--border);background:var(--surface);width:100%;color:var(--text);border-radius:8px;padding:8px 10px}.segmented{border:1px solid var(--border);border-radius:10px;display:flex;overflow:hidden}.segmented button{cursor:pointer;background:0 0;border:none;flex:1;padding:8px 4px;font-size:13px}.segmented button+button{border-left:1px solid var(--border)}.segmented button.active{background:var(--accent);color:var(--accent-contrast)}.drop-overlay{z-index:100;background:color-mix(in srgb, var(--accent) 14%, transparent);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);place-items:center;display:grid;position:fixed;inset:0}.drop-box{border:2px dashed var(--accent);background:var(--surface);box-shadow:var(--shadow);border-radius:18px;flex-direction:column;align-items:center;gap:12px;padding:48px 64px;display:flex}.drop-icon{font-size:40px}.toast{z-index:200;color:#fff;box-shadow:var(--shadow);background:#111827;border-radius:10px;max-width:90vw;padding:12px 18px;font-size:14px;position:fixed;bottom:24px;left:50%;transform:translate(-50%)}@media (width<=760px){.library{padding:20px 16px 48px}.library-top{flex-direction:column;align-items:stretch}.library-actions .primary-btn{flex:1}.book-grid{grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:18px 14px}.reader-sidebar{z-index:30;width:min(85vw,320px);box-shadow:var(--shadow);position:absolute;top:0;bottom:0;left:0}.settings-sidebar{left:auto;right:0}}