.epub-reader{display:flex;flex-direction:column;height:600px;border:1px solid var(--border-color, #ddd);border-radius:8px;overflow:hidden}.loading-state,.error-state{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1rem;padding:3rem}.loading-state .spinner{font-size:3rem;animation:spin 2s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.error-message{color:var(--error, #ef4444)}.reader-header{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem;background:var(--bg-secondary, #f5f5f5);border-bottom:1px solid var(--border-color, #ddd)}.book-info{display:flex;flex-direction:column}.book-title{margin:0;font-size:1rem;font-weight:600}.book-author{font-size:.8125rem;color:var(--text-secondary, #666)}.reader-controls{display:flex;align-items:center;gap:.5rem}.reader-controls button{padding:.25rem .5rem;border:1px solid var(--border-color, #ddd);background:#fff;border-radius:4px;cursor:pointer}.reader-controls span{font-size:.75rem;color:var(--text-secondary, #666);min-width:40px;text-align:center}.btn-close{margin-left:.5rem}.reader-body{display:flex;flex:1;overflow:hidden}.toc-sidebar{width:220px;background:var(--bg-secondary, #f5f5f5);border-right:1px solid var(--border-color, #ddd);overflow-y:auto;flex-shrink:0}.toc-sidebar h4{margin:0;padding:.75rem 1rem;font-size:.875rem;border-bottom:1px solid var(--border-color, #ddd)}.toc-sidebar ul{list-style:none;margin:0;padding:0}.toc-sidebar li{padding:.5rem 1rem;font-size:.8125rem;cursor:pointer;border-bottom:1px solid rgba(0,0,0,.05);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.toc-sidebar li:hover{background:#0000000d}.toc-sidebar li.active{background:var(--primary, #4361ee);color:#fff}.chapter-content{flex:1;overflow-y:auto;padding:2rem;background:#fff}.content-inner{max-width:700px;margin:0 auto;line-height:1.8}.content-inner img{max-width:100%;height:auto}.content-inner h1,.content-inner h2,.content-inner h3{margin-top:1.5em;margin-bottom:.5em}.content-inner p{margin:0 0 1em}.reader-footer{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem;background:var(--bg-secondary, #f5f5f5);border-top:1px solid var(--border-color, #ddd)}.chapter-indicator{font-size:.875rem;color:var(--text-secondary, #666)}.privacy-note{text-align:center;padding:.75rem;background:#4caf501a;color:var(--success, #4caf50);border-radius:8px;font-size:.875rem;margin-top:1rem}@media(max-width:768px){.epub-reader{height:500px}.toc-sidebar{display:none}.chapter-content{padding:1rem}}