.bfb-reader{width:100%;height:var(--bfb-height,78vh);min-height:520px;background:#000;color:#fff;border-radius:12px;overflow:hidden;display:flex;flex-direction:column;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;position:relative}
.bfb-toolbar{height:54px;flex:0 0 54px;display:flex;align-items:center;gap:4px;padding:0 10px;background:#000;border-bottom:1px solid rgba(255,255,255,.08);z-index:50}.bfb-btn{appearance:none;border:0;background:transparent;color:#fff;min-width:36px;height:36px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;font-size:21px;cursor:pointer;text-decoration:none;line-height:1;transition:background .15s ease,opacity .15s ease}.bfb-btn:hover{background:rgba(255,255,255,.09)}.bfb-btn:disabled{opacity:.3;cursor:not-allowed}.bfb-page-count{font-size:13px;min-width:72px;text-align:center;opacity:.92}.bfb-sep{opacity:.45;padding:0 4px}.bfb-spacer{flex:1}.bfb-zoom-label{font-size:12px;min-width:46px;text-align:center;opacity:.85}
.bfb-search-wrap{position:relative;display:flex;align-items:center}.bfb-search-box{display:flex;align-items:center;background:#fff;border-radius:9px;padding:0 4px;margin-right:4px;box-shadow:0 8px 24px rgba(0,0,0,.25)}.bfb-search-box[hidden]{display:none}.bfb-search-input{border:0;outline:0;width:210px;height:34px;padding:0 8px;background:transparent;color:#222;font-size:13px}.bfb-search-clear{border:0;background:transparent;width:28px;height:30px;cursor:pointer;color:#555;font-size:18px}.bfb-search-results{position:absolute;top:58px;right:10px;width:min(390px,calc(100% - 20px));max-height:min(60vh,520px);overflow:auto;background:#fff;color:#222;border-radius:12px;box-shadow:0 12px 35px rgba(0,0,0,.34);z-index:100}.bfb-search-results[hidden]{display:none}.bfb-search-results-head{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:12px 14px;border-bottom:1px solid #e8e8e8;position:sticky;top:0;background:#fff;z-index:2;font-size:12px}.bfb-search-close{border:0;background:transparent;color:#666;font-size:20px;cursor:pointer}.bfb-search-result-list{padding:6px}.bfb-search-result{display:block;width:100%;text-align:left;border:0;background:transparent;padding:10px;border-radius:8px;cursor:pointer}.bfb-search-result:hover{background:#f3f3f3}.bfb-result-page{display:block;font-size:11px;font-weight:700;opacity:.7;margin-bottom:3px}.bfb-result-snippet{display:block;font-size:12px;line-height:1.45}
.bfb-body{position:relative;flex:1;min-height:0;display:flex}.bfb-stage-wrap{position:relative;flex:1;min-width:0;min-height:0;display:flex;align-items:center;justify-content:center;overflow:hidden;background:#000}.bfb-flip-root{position:relative;display:flex;align-items:center;justify-content:center;width:100%;height:100%;background:#000;overflow:hidden}.bfb-pages-host{display:block;width:1px;height:1px;position:absolute;left:-10000px;top:-10000px;overflow:hidden}.bfb-page{background:#fff;overflow:hidden}.bfb-page-content{position:relative;width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:#fff;overflow:hidden}.bfb-page-canvas{display:block;width:100%;height:100%;object-fit:contain;background:#fff;visibility:hidden}.bfb-page-cover .bfb-page-canvas{object-fit:contain}
.bfb-thumbnails-panel{width:0;overflow:hidden;background:#050505;transition:width .18s ease;z-index:15}.bfb-reader.thumbs-open .bfb-thumbnails-panel{width:118px;overflow:auto}.bfb-thumbnails{display:flex;flex-direction:column;gap:8px;padding:10px}.bfb-thumb{border:2px solid transparent;border-radius:6px;padding:0;background:rgba(255,255,255,.06);cursor:pointer;overflow:hidden}.bfb-thumb.active{border-color:#fff}.bfb-thumb canvas{display:block;width:100%;height:auto;background:#fff}.bfb-thumb span{display:block;font-size:10px;padding:4px 0;color:rgba(255,255,255,.75)}
.bfb-loading{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;gap:12px;z-index:40;background:#000;font-size:14px;padding:24px;text-align:center}.bfb-loading[hidden]{display:none}.bfb-spinner{width:22px;height:22px;border:2px solid rgba(255,255,255,.25);border-top-color:#fff;border-radius:50%;animation:bfb-spin .7s linear infinite}@keyframes bfb-spin{to{transform:rotate(360deg)}}.bfb-error{position:absolute;left:20px;right:20px;top:50%;transform:translateY(-50%);padding:20px;border-radius:10px;background:#fff;color:#222;text-align:center;z-index:45;line-height:1.5}.bfb-error[hidden]{display:none}.bfb-error-help{font-size:12px;color:#666;margin-top:8px}
.bfb-footer{height:46px;flex:0 0 46px;display:flex;align-items:center;gap:12px;padding:0 12px;background:#000;font-size:11px}.bfb-progress-wrap{flex:1;min-width:80px}.bfb-progress{position:relative;height:8px;border-radius:99px;background:rgba(255,255,255,.16);cursor:pointer;outline:none}.bfb-progress:focus-visible{box-shadow:0 0 0 2px #fff,0 0 0 4px rgba(255,255,255,.18)}.bfb-progress>span{display:block;height:100%;width:0;background:#fff;border-radius:99px;transition:width .12s linear}.bfb-progress-preview{position:absolute;bottom:18px;transform:translateX(-50%);width:108px;padding:5px;border-radius:8px;background:#fff;color:#111;box-shadow:0 10px 30px rgba(0,0,0,.45);pointer-events:none;z-index:200}.bfb-progress-preview[hidden]{display:none}.bfb-progress-preview canvas{display:block;width:100%;height:auto;background:#fff;border-radius:4px}.bfb-progress-preview-label{display:block;text-align:center;font-size:10px;font-weight:700;margin-top:4px;white-space:nowrap}.bfb-doc-title{max-width:32%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;opacity:.72}
.bfb-reader.is-fullscreen{position:fixed;inset:0;width:100vw;height:100vh;max-width:none;min-height:0;border-radius:0;z-index:999999}.bfb-notice{padding:16px;border-radius:8px;background:#f4f4f4;color:#222}
/* StPageFlip HTML renderer normally injects its own positioning. Keep its page canvas crisp and suppress shadows. */.stf__block,.stf__item,.stf__outerShadow,.stf__innerShadow{box-shadow:none!important}.stf__parent{background:#000!important}.stf__block{background:#fff!important}.stf__canvas{background:#000!important}
@media(max-width:700px){.bfb-reader{min-height:420px;border-radius:0}.bfb-toolbar{height:48px;flex-basis:48px;padding:0 5px}.bfb-btn{min-width:32px;height:32px}.bfb-zoom-label{min-width:40px;font-size:11px}.bfb-page-count{min-width:58px;font-size:12px}.bfb-doc-title{display:none}.bfb-reader.thumbs-open .bfb-thumbnails-panel{width:92px}.bfb-thumbnails{padding:7px;gap:6px}.bfb-footer{height:38px;flex-basis:38px;padding:0 8px}.bfb-search-input{width:150px}.bfb-search-results{top:52px;right:6px;width:calc(100% - 12px)}.bfb-progress-preview{width:92px;bottom:16px}}