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var(--hb-line);border-radius:12px;background:#fff;color:var(--hb-ink)!important;font-size:15px;font-weight:700;text-decoration:none!important;white-space:nowrap;cursor:pointer;transition:border-color .15s,background .15s}.bk-btn:hover{border-color:#c9c1ea;background:#faf8ff}.bk-btn.is-dark{border-color:var(--hb-ink);background:var(--hb-ink);color:#fff!important}.bk-btn.is-dark:hover{background:#2a2650}.bk-btn.is-small{min-height:38px;padding:0 14px;border-radius:11px;font-size:14px}.bk-btn .icon{font-size:15px}.bk-icon{display:grid;place-items:center;width:36px;height:36px;border:0;border-radius:10px;background:none;color:var(--hb-muted);cursor:pointer}.bk-icon:hover{background:#f3f1fa;color:var(--hb-ink)}.bk-tags{display:flex;flex-wrap:wrap;gap:6px}.bk-tags span{padding:3px 10px;border-radius:99px;background:#f3f1fa;color:var(--hb-text);font-size:12.5px;font-weight:650}.bk-tags span.is-lang{background:#e6f6f0;color:#0a5c46}.bk-tags 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0}.bk-fan-book.f0{rotate:-17deg;translate:-126% 8px;z-index:1}.bk-fan-book.f1{rotate:-8.5deg;translate:-89% 0;z-index:2}.bk-fan-book.f2{width:166px;z-index:5}.bk-fan-book.f3{rotate:8.5deg;translate:-11% 0;z-index:2}.bk-fan-book.f4{rotate:17deg;translate:26% 8px;z-index:1}@media (prefers-reduced-motion: no-preference){.bk-hero:not(.is-calm) .bk-fan-book{animation:bk-deal .8s cubic-bezier(.2,.7,.2,1) both}.bk-hero:not(.is-calm) .bk-fan-book.f1,.bk-hero:not(.is-calm) .bk-fan-book.f3{animation-delay:.08s}.bk-hero:not(.is-calm) .bk-fan-book.f0,.bk-hero:not(.is-calm) .bk-fan-book.f4{animation-delay:.16s}@keyframes bk-deal{0%{opacity:0;rotate:0deg;translate:-50% 30px}}}.bk-strip{display:none}.bk-main{position:relative}.bk-bar{position:sticky;top:var(--bk-top);z-index:30;margin-top:-1px;padding:11px 0 10px;background:#fbfafff5;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);transition:box-shadow .2s}.bk-bar.is-stuck:before{content:"";position:absolute;left:-100vmax;right:-100vmax;bottom:100%;height:16px;background:#fbfaff}.bk-bar,.bk-topics{box-shadow:0 0 0 100vmax #fbfafff5;clip-path:inset(-16px -100vmax 0)}.bk-tabs{display:inline-flex;gap:4px;max-width:100%;padding:5px;border:1px solid var(--hb-line);border-radius:16px;background:#fff;box-shadow:var(--hb-shadow)}.bk-tabs [role=tab]{text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 16px;border:0;border-radius:12px;background:none;color:var(--hb-muted);font-size:15px;font-weight:700;white-space:nowrap;cursor:pointer;transition:background .15s,color .15s}.bk-tabs [role=tab]:hover{background:#f6f4fc;color:var(--hb-ink)}.bk-tabs [role=tab][aria-selected=true]{background:var(--hb-ink);color:#fff}.bk-tabs .icon{font-size:16px}.bk-short{display:none}.bk-n{min-width:22px;padding:2px 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button:hover{border-color:#c9c1ea}.bk-shelves button[aria-pressed=true]{border-color:var(--hb-violet);background:var(--hb-tint);color:var(--hb-violet-dark)}.bk-shelves .icon{font-size:14px;color:var(--hb-violet)}.bk-panels{padding:18px 0 88px}.bk-panel-head{margin-bottom:22px}.bk-panel-head h2{font-size:clamp(22px,2.6vw,28px);font-weight:800}.bk-panel-head p{max-width:640px;margin-top:6px;color:var(--hb-muted);font-size:15.5px;line-height:1.55}.bk-none{padding:48px 0;color:var(--hb-muted);text-align:center}.bk-section+.bk-section{margin-top:56px;padding-top:40px;border-top:1px solid var(--hb-line)}.bk-section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:12px 24px;margin-bottom:24px}.bk-section-head h2{font-size:clamp(22px,2.6vw,28px);font-weight:800}.bk-section-head p{max-width:640px;margin-top:6px;color:var(--hb-muted);font-size:15.5px;line-height:1.55}.bk-filter-chip{display:inline-flex;align-items:center;gap:4px;margin-bottom:22px;padding:4px 4px 4px 14px;border-radius:99px;background:var(--hb-tint);color:var(--hb-violet-dark);font-weight:700;font-size:14.5px}.bk-filter-chip a{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;color:inherit}.bk-filter-chip a:hover{background:#6a4cf01f}.bk-picks{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,360px),1fr));gap:18px}.bk-pick{position:relative;display:grid;grid-template-columns:100px minmax(0,1fr);gap:18px;align-items:start;padding:18px;border:1px solid var(--hb-line);border-radius:20px;background:#fff;box-shadow:var(--hb-shadow);transition:transform .2s,box-shadow .2s,border-color 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#e3dcff;color:var(--hb-text);font-size:14.5px;line-height:1.5}.bk-pick-by{display:flex;align-items:center;gap:9px;margin-top:6px;color:var(--hb-text);font-size:13.5px;font-weight:650}.bk-faces{display:flex}.bk-faces>*{display:grid;place-items:center;width:28px;height:28px;margin-left:-8px;border:2px solid #fff;border-radius:50%;background:#e9e4ff;color:#3d2a9e;font-size:11px;font-weight:800;object-fit:cover}.bk-faces>:first-child{margin-left:0}.bk-more{margin-left:6px;padding:1px 7px;border-radius:99px;background:#f1eefb;color:var(--hb-violet-dark);font-size:12px;font-weight:800}.bk-pick>.bk-save{position:absolute;top:14px;right:14px}.bk-shelf{display:grid;grid-template-columns:repeat(auto-fill,minmax(128px,1fr));gap:32px 22px}.bk-book{position:relative;display:grid;align-content:start;gap:6px}.bk-book-open{display:grid;gap:3px;padding:0;border:0;background:none;text-align:left;cursor:pointer}.bk-book-open .bk-cover{margin-bottom:10px;transition:transform .25s 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cubic-bezier(.2,.8,.2,1)}.bk-dialog:focus{outline:none}.bk-dialog::backdrop{background:#15132e73;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}@keyframes bk-pop{0%{opacity:0;transform:translateY(12px) scale(.98)}}.bk-d-head{position:relative;display:flex;flex:none;gap:20px;align-items:flex-end;padding:24px 24px 20px;background:var(--bk-paper);border-bottom:1px solid #f1e6d4}.bk-d-cover{flex:none;width:112px}.bk-d-title{display:grid;grid-template-columns:minmax(0,1fr);gap:8px;min-width:0;padding-right:32px}.bk-d-title h2{font-size:22px;font-weight:800;line-height:1.2;overflow-wrap:anywhere}.bk-d-author{color:var(--hb-muted);font-size:15px}.bk-d-close{position:absolute;top:12px;right:12px;display:grid;place-items:center;width:40px;height:40px;border:0;border-radius:12px;background:#fffc;color:var(--hb-muted);cursor:pointer}.bk-d-close:hover{background:#fff;color:var(--hb-ink)}.bk-d-close:focus-visible{outline:2px solid var(--hb-violet);outline-offset:2px}.bk-d-body{flex:1 1 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.bk-d-profile .icon{translate:2px 0}.bk-d-tutors blockquote{margin-left:54px;padding:12px 16px;border-radius:4px 14px 14px;background:#f6f4fd;color:var(--hb-text);font-size:15px;line-height:1.55;overflow-wrap:anywhere}.bk-d-why{margin-top:8px;color:var(--hb-text);font-size:16px;line-height:1.6}.bk-d-fine{display:flex;align-items:center;gap:10px;margin:16px 0 10px!important;color:var(--hb-muted);font-size:13.5px;line-height:1.45}.bk-edufy-mark{display:grid;place-items:center;flex:none;width:24px;height:24px;border-radius:7px;background:var(--hb-ink);color:#fff;font:800 12px/1 Plus Jakarta Sans,Inter,sans-serif}.bk-d-page{display:inline-flex;align-items:center;gap:5px;width:max-content;margin-top:2px;color:var(--hb-violet-dark);font-size:14px;font-weight:700;text-decoration:none}.bk-d-page .icon{transition:translate .15s}.bk-d-page:hover .icon{translate:2px 0}.bk-d-actions{display:flex;flex:none;flex-wrap:wrap;gap:8px;padding:14px 24px 18px;border-top:1px solid #f1eff7;background:#fff}.bk-d-actions .bk-btn{flex:1 1 0}.bk-world{margin-top:40px;padding-top:30px;border-top:1px solid var(--hb-line)}.bk-world[aria-busy=true] .bk-world-list{opacity:.55}.bk-world-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,330px),1fr));gap:14px}.bk-world-item{display:grid;grid-template-columns:74px minmax(0,1fr);gap:14px;padding:14px;border:1px solid var(--hb-line);border-radius:18px;background:#fff;box-shadow:var(--hb-shadow)}.bk-world-item .bk-cover{width:74px}.bk-world-body{display:grid;align-content:start;gap:3px;min-width:0}.bk-world-title{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;color:var(--hb-ink);font:750 16px/1.3 Plus Jakarta 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