.flip-book-container{position:relative;width:100%;height:70vh;display:flex;justify-content:center;align-items:center;background-color:#f8f9fa;overflow:hidden;margin-bottom:20px;border:1px solid #ddd;border-radius:4px}.stf__wrapper{box-shadow:0 0 20px #0000001a}.page{background-color:#fff;color:#333;overflow:hidden;box-shadow:inset -1px 0 5px #0000000d}.page-content{width:100%;height:100%;display:flex;justify-content:center;align-items:center}.flip-controls{display:flex;justify-content:center;align-items:center;gap:15px;padding:10px;background:#f1f1f1;border-radius:30px;width:-moz-fit-content;width:fit-content;margin:15px auto 20px}.flip-btn{background:#fff;color:#333;border:1px solid #ddd;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .3s ease;box-shadow:0 2px 5px #0000001a}.flip-btn-fullscreen{width:auto;padding:0 14px;border-radius:20px;font-size:.9rem;gap:6px}.flip-btn:hover:not(:disabled){background:#8b5e3c;color:#fff;border-color:#8b5e3c;transform:translateY(-2px)}.flip-btn:disabled{opacity:.5;cursor:not-allowed;background:#f9f9f9}#pageInfo{font-family:Cinzel,serif;font-weight:600;color:#555;min-width:65px;text-align:center}.flip-loader{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:1.2rem;color:#8b5e3c;display:flex;flex-direction:column;align-items:center;gap:10px}@media(max-width:360px){.flip-book-container{height:65vh}.page-content{display:block;width:100%;height:100%}#pageInfo{min-width:65px}}@media(max-width:320px){.flip-book-container{height:60vh}.page-content{display:block;width:100%;height:100%}#pageInfo{min-width:65px}}.spinner{width:40px;height:40px;border:4px solid #f3f3f3;border-top:4px solid #8b5e3c;border-radius:50%;animation:spin 1s linear infinite}.spinner.small{width:20px;height:20px;border-width:2px}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}#epub-viewer{background:#fff;width:100%;height:100%}.fullscreen-toolbar{position:absolute;top:10px;right:10px;display:none;gap:8px;background:#ffffffe6;border:1px solid #ddd;border-radius:24px;padding:6px 8px;box-shadow:0 4px 12px #00000026;z-index:20}.fullscreen-toolbar .flip-btn{box-shadow:none;border-color:#ccc}.presentation-container{width:100%;height:100%;background:#000;display:none;align-items:center;justify-content:center;position:relative}.presentation-stage{width:90%;max-width:1600px;aspect-ratio:16 / 9;background:#111;border:1px solid #222;box-shadow:0 8px 24px #0006;position:relative;overflow:hidden}.presentation-stage canvas{width:100%;height:100%;-o-object-fit:contain;object-fit:contain;display:block;background:#111}.hidden{display:none!important}.document-preview-container{position:relative}.document-preview-iframe{width:100%;height:600px;border:none}.error-text{color:red}