.kfb{--kfb-ink:#23352f;box-sizing:border-box;background:#f0eee8;color:var(--kfb-ink);border:1px solid #deddd5;border-radius:14px;overflow:hidden;font:14px/1.5 system-ui,sans-serif;margin:24px 0;width:100%}.kfb *{box-sizing:border-box}.kfb-header{display:flex;justify-content:space-between;gap:16px;padding:18px 24px;border-bottom:1px solid #dcdcd3}.kfb-header strong{font-size:18px}.kfb-header span{font-size:10px;letter-spacing:2px;align-self:center}.kfb-stage{height:var(--kfb-height);max-height:75vh;overflow:auto;padding:28px 20px;display:flex;align-items:flex-start;perspective:1800px;background:radial-gradient(ellipse at center,#faf9f5,#e6e3da);touch-action:pan-x pan-y}.kfb-book{display:flex;margin:auto;flex-shrink:0;box-shadow:0 16px 36px #23352f30;transform-style:preserve-3d}.kfb-sheet{position:relative;flex-shrink:0;background:white}.kfb-sheet canvas{display:block;max-width:none!important}.kfb-sheet+.kfb-sheet{border-left:1px solid #bbb}.kfb-sheet+.kfb-sheet:after{content:"";position:absolute;inset:0 auto 0 0;width:18px;background:linear-gradient(90deg,#0002,transparent);pointer-events:none}.kfb-toolbar{display:flex;justify-content:center;align-items:center;gap:8px;flex-wrap:wrap;padding:12px 16px}.kfb-toolbar button,.kfb-toolbar a{font:inherit;color:var(--kfb-ink);background:#fff;border:1px solid #cccfc7;border-radius:7px;min-height:40px;min-width:40px;padding:7px 12px;text-decoration:none;cursor:pointer}.kfb-toolbar button:hover,.kfb-toolbar a:hover{background:#e0e8dd}.kfb-toolbar button:disabled{opacity:.4;cursor:default}.kfb :focus-visible{outline:3px solid #377a64;outline-offset:2px}.kfb-toolbar label{display:flex;gap:6px;align-items:center}.kfb-page{width:64px!important;padding:7px!important;background:white!important;color:#23352f!important;border:1px solid #cccfc7!important;border-radius:6px!important;font:inherit!important;min-height:40px}.kfb-status{font-size:12px;text-align:center;margin:0!important;padding:5px 12px;min-height:28px}.kfb:fullscreen{width:100%;height:100%;border-radius:0;display:flex;flex-direction:column;margin:0}.kfb:fullscreen .kfb-stage{flex:1;height:auto;max-height:none}.kfb:fullscreen .kfb-toolbar{flex-shrink:0}@media(max-width:600px){.kfb-header{padding:12px}.kfb-header span{display:none}.kfb-stage{padding:16px 8px;max-height:65vh}.kfb-toolbar{gap:5px;padding:10px 5px}.kfb-toolbar button,.kfb-toolbar a{padding:6px 9px}}@media(prefers-reduced-motion:reduce){.kfb *{animation:none!important;transition:none!important}}