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var(--z)))}}.bbm-field.is-live .bbm{translate:calc(var(--px, 0) * -18px * var(--z)) calc(var(--py, 0) * -14px * var(--z));transition:translate var(--dur-slower) var(--ease-standard)}.bb-pattern__marks{position:absolute;inset-block-end:0;inset-inline-end:0;inset-block-start:auto;inset-inline-start:auto;height:92%;width:auto;aspect-ratio:1017 / 1254;max-width:70%}.bb-pattern__marks .bb-marks{width:100%;height:100%}.bb-pattern--bottom-start .bb-pattern__marks{inset-inline-end:auto;inset-inline-start:0}.bb-pattern--bottom-end .bb-pattern__marks .bb-marks{transform:scaleX(-1)}[dir=rtl] .bb-pattern--bottom-end .bb-pattern__marks .bb-marks,[dir=rtl].bb-pattern--bottom-end .bb-pattern__marks .bb-marks{transform:none}[dir=rtl] .bb-pattern--bottom-start .bb-pattern__marks .bb-marks,[dir=rtl].bb-pattern--bottom-start .bb-pattern__marks .bb-marks{transform:scaleX(-1)}.bb-pattern--marks .bb-pattern__art.bb-pattern__marks{inset:auto;inset-block-end:0;inset-inline-end:0}.bb-pattern--bottom-start 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var(--brand-indigo);--loader-b: var(--brand-blue)}.bb-loader--white{--loader-a: var(--on-brand);--loader-b: var(--on-brand)}.bb-loader svg{overflow:visible}.bb-loader__track{fill:none;stroke:var(--border);stroke-width:7;stroke-linejoin:miter}.bb-loader--white .bb-loader__track{stroke:#ffffff40}.bb-loader__run{fill:none;stroke-width:7;stroke-linecap:butt;stroke-linejoin:miter;stroke-dasharray:26 74}.bb-loader__run--outer{animation:bb-trace 1.6s linear infinite}.bb-loader__run--inner{animation:bb-trace 1.6s linear infinite reverse;stroke-dasharray:34 66}.bb-loader svg{animation:bb-breathe-loader 3.2s var(--ease-ambient) infinite alternate}@keyframes bb-trace{to{stroke-dashoffset:-100}}@keyframes bb-breathe-loader{0%{transform:scale(.96)}to{transform:scale(1.04)}}.bb-intro{display:block;overflow:visible}.bb-intro__mark{stroke-width:16;stroke-dasharray:1;stroke-dashoffset:0;fill-opacity:1}.bb-intro.is-playing .bb-intro__mark{animation:bb-draw 1.1s var(--ease-standard) both,bb-fill .6s var(--ease-standard) .9s both;animation-delay:calc(var(--i) * .12s),calc(.9s + var(--i) * .12s)}@keyframes bb-draw{0%{stroke-dashoffset:1}to{stroke-dashoffset:0}}@keyframes bb-fill{0%{fill-opacity:0}to{fill-opacity:1}}.bb-intro__letter{transform-box:fill-box;transform-origin:50% 100%}.bb-intro.is-playing .bb-intro__letter{animation:bb-letter var(--dur-slow) var(--ease-spring) both;animation-delay:calc(1.3s + var(--i) * var(--stagger-step))}@keyframes bb-letter{0%{opacity:0;transform:translateY(60%) scaleY(.6)}to{opacity:1;transform:none}}.bb-screens{position:relative;overflow:hidden;height:100%}.bb-screen{height:100%;animation:bb-screen-forward var(--dur-slow) var(--ease-enter) both}.bb-screen--back{animation-name:bb-screen-back}@keyframes bb-screen-forward{0%{opacity:0;transform:translate(-32px)}}@keyframes bb-screen-back{0%{opacity:0;transform:translate(32px)}}[dir=ltr] .bb-screen--forward{animation-name:bb-screen-forward-ltr}[dir=ltr] .bb-screen--back{animation-name:bb-screen-back-ltr}@keyframes bb-screen-forward-ltr{0%{opacity:0;transform:translate(32px)}}@keyframes bb-screen-back-ltr{0%{opacity:0;transform:translate(-32px)}}@media (prefers-reduced-motion: reduce){.bb-root *,.bb-root *:before,.bb-root *:after{animation-duration:1ms!important;animation-iteration-count:1!important;animation-delay:0ms!important;transition-duration:var(--dur-instant)!important;transition-delay:0ms!important;scroll-behavior:auto!important}.bb-reveal:not(.bb-reveal--stagger),.bb-reveal--stagger>.bb-reveal__item{transform:none;filter:none}.bb-course.is-interactive:hover,.bb-lecture:hover{transform:none}.bbh-field .bbh-s,.bbh-field .bbh-h,.bbd circle,.bbm{animation:none!important;translate:none!important;scale:none!important}.bb-skeleton:after{animation:none!important;opacity:0}}@property --bbS{syntax: "<number>"; inherits: true; initial-value: 0;}.bb-cont{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.bb-cont__art{display:block;width:100%;height:100%;overflow:hidden}.bb-cont.is-flipped .bb-cont__art{transform:scaleX(-1)}.bb-cont__lat{transform:translateY(calc((var(--base) + var(--bbS)) * 1px))}.bb-cont__art.is-timeline .bb-cont__lat{animation:bb-cont-y linear both;animation-timeline:scroll(nearest block)}.bb-cont__art.is-timeline{animation:bb-cont-s linear both;animation-timeline:scroll(nearest block)}@keyframes bb-cont-y{0%{transform:translateY(calc(var(--base) * 1px))}to{transform:translateY(calc((var(--base) + var(--smaxk)) * 1px))}}@keyframes bb-cont-s{0%{--bbS: 0}to{--bbS: var(--smaxk)}}.bb-cont .bbh{--rise: clamp(0, calc((var(--h) - var(--cy) - var(--base) - var(--bbS)) / (var(--h) * .66)), 1);--s2: min(1, calc(var(--s) * (.35 + .65 * var(--rise)) + .25 * var(--rise)))}.bb-cont .bbh-s{transform:translate(calc(5.4px * var(--s2)),calc(18px * var(--s2)));opacity:calc(.25 + .75 * var(--s2))}.bb-cont .bbh-h{opacity:calc((.25 + .75 * var(--d)) * (.4 + .6 * var(--rise)))}.bb-hero .bb-cont{-webkit-mask-image:linear-gradient(to right,#000 0%,#000 30%,transparent 88%);mask-image:linear-gradient(to right,#000 0%,#000 30%,transparent 88%)}[dir=ltr] .bb-hero .bb-cont{-webkit-mask-image:linear-gradient(to left,#000 0%,#000 30%,transparent 88%);mask-image:linear-gradient(to left,#000 0%,#000 30%,transparent 88%)}@media (prefers-reduced-motion: reduce){.bb-cont__art.is-timeline,.bb-cont__art.is-timeline .bb-cont__lat{animation-duration:auto!important;animation-iteration-count:1!important}}.bb-window{display:flex;flex-direction:column;overflow:hidden;background:var(--surface-page);border:1px solid var(--border);border-radius:8px;box-shadow:var(--shadow-lg);color:var(--ink);font-family:var(--font-sans)}.bb-window__titlebar{position:relative;z-index:3;display:flex;align-items:center;gap:var(--space-4);block-size:40px;padding-inline-start:var(--space-4);background:var(--surface-page);border-block-end:1px solid var(--border);-webkit-user-select:none;user-select:none;-webkit-app-region:drag}.bb-window.is-inactive .bb-window__titlebar{opacity:.7}.bb-window__app{display:inline-flex;align-items:center;gap:var(--space-2);flex:none}.bb-window__app .bb-logo{direction:ltr}.bb-window__title{font:500 12px/16px var(--font-sans);color:var(--ink-strong)}.bb-window__sub{font:400 12px/16px var(--font-sans);color:var(--ink-muted)}.bb-window__sub:before{content:"·";margin-inline-end:var(--space-2)}.bb-window__search{flex:1;max-inline-size:420px;margin-inline:auto;display:flex;align-items:center;gap:var(--space-2);block-size:30px;padding-inline:var(--space-3);border-radius:6px;background:var(--surface-card);border:1px solid var(--border);color:var(--ink-muted);-webkit-app-region:no-drag;transition:border-color var(--dur-fast) var(--ease-standard),box-shadow var(--dur-fast) var(--ease-standard)}.bb-window__search:focus-within{border-color:var(--focus-ring);box-shadow:0 0 0 3px var(--primary-soft)}.bb-window__search input{flex:1;min-inline-size:0;border:0;outline:0;background:transparent;font:400 12px/16px var(--font-sans);color:var(--ink-strong)}.bb-window__search input::placeholder{color:var(--ink-muted)}.bb-window__search kbd{font:500 10px/14px var(--font-sans);padding:1px 6px;border-radius:4px;border:1px solid var(--border);color:var(--ink-muted);background:var(--surface-tint)}.bb-window__caption{display:flex;margin-inline-start:auto;-webkit-app-region:no-drag}.bb-window__search+.bb-window__caption{margin-inline-start:0}.bb-window__btn{display:grid;place-items:center;inline-size:46px;block-size:40px;border:0;background:transparent;color:var(--ink-strong);cursor:default;transition:background-color var(--dur-fast) var(--ease-standard),color var(--dur-fast) var(--ease-standard)}.bb-window__btn svg{inline-size:10px;block-size:10px;fill:none;stroke:currentColor;stroke-width:1}.bb-window__btn:hover{background:var(--surface-sunken)}.bb-window__btn:active{background:var(--border)}.bb-window__btn--close:hover{background:var(--danger);color:var(--on-danger)}.bb-window__btn:focus-visible{outline:2px solid var(--focus-ring);outline-offset:-2px}.bb-window__body{position:relative;flex:1;min-block-size:0;display:flex}.bb-window__body>.bb-sidebar{block-size:auto}.bb-hexspin{flex:none;overflow:visible}.bb-hexspin polygon{fill:none;stroke:currentColor;stroke-width:2.5;stroke-linejoin:miter;stroke-miterlimit:4;stroke-linecap:butt}.bb-hexspin__track{opacity:.3}.bb-hexspin__run{stroke-dasharray:34 66;animation:bb-trace 1.1s linear infinite}.bb-dd{position:relative}.bb-dd__trigger{inline-size:100%;cursor:pointer;text-align:start;font:400 14px/22px var(--font-sans);color:var(--ink-strong)}.bb-dd__trigger:disabled{cursor:not-allowed;opacity:.5}.bb-dd__trigger.is-placeholder{color:var(--ink-muted)}.bb-dd__value{flex:1;min-inline-size:0;display:flex;align-items:center;gap:var(--space-2);overflow:hidden;white-space:nowrap}.bb-dd__value .bb-menu__desc{display:none}.bb-dd__value .bb-icon{color:var(--primary-ink)}.bb-dd__chev{transition:transform var(--dur-base) var(--ease-standard);color:var(--ink-muted)}.bb-dd.is-open .bb-dd__chev{transform:rotate(180deg)}.bb-dd.is-open .bb-dd__trigger{border-color:var(--focus-ring);box-shadow:0 0 0 4px var(--primary-soft)}.bb-menu{position:absolute;z-index:40;min-inline-size:100%;inset-block-start:calc(100% + 6px);inset-inline-start:0;padding:var(--space-1);background:var(--surface-raised);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);transform-origin:top;animation:bb-menu-in var(--dur-base) var(--ease-enter) both}@keyframes bb-menu-in{0%{opacity:0;transform:translateY(-6px) scale(.97)}}@keyframes bb-item-in{0%{opacity:0;transform:translateY(6px)}}.bb-menu__list{list-style:none;margin:0;padding:0;max-block-size:280px;overflow:auto}.bb-menu__item{display:flex;align-items:center;gap:var(--space-3);inline-size:100%;min-block-size:40px;padding:8px var(--space-3);border:0;border-radius:var(--radius-sm);background:transparent;color:var(--ink);cursor:pointer;text-align:start;font:400 14px/20px var(--font-sans);animation:bb-item-in var(--dur-base) var(--ease-enter) backwards;animation-delay:calc(var(--i, 0) * 18ms);transition:background-color var(--dur-fast) var(--ease-standard),color var(--dur-fast) var(--ease-standard)}.bb-menu__item .bb-icon{color:var(--ink-muted);flex:none}.bb-menu__item[data-active=true]{background:var(--surface-tint);color:var(--ink-strong)}.bb-menu__item.is-selected{color:var(--primary-ink);font-weight:500}.bb-menu__item.is-selected .bb-icon{color:var(--primary-ink)}.bb-menu__item.is-disabled,.bb-menu__item:disabled{opacity:.45;cursor:not-allowed}.bb-menu__text{flex:1;min-inline-size:0;display:flex;flex-direction:column}.bb-menu__label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.bb-menu__desc{font-size:12px;line-height:16px;color:var(--ink-muted)}.bb-menu__check{opacity:0;transform:scale(.6);transition:opacity var(--dur-fast) var(--ease-standard),transform var(--dur-base) var(--ease-spring)}.bb-menu__item.is-selected .bb-menu__check{opacity:1;transform:none}.bb-menu__search{display:flex;align-items:center;gap:var(--space-2);margin:0 0 var(--space-1);padding:0 var(--space-3);block-size:38px;border-block-end:1px solid var(--border);color:var(--ink-muted)}.bb-menu__search input{flex:1;border:0;outline:0;background:transparent;font:400 14px/20px var(--font-sans);color:var(--ink-strong)}.bb-menu__empty{padding:var(--space-4);text-align:center;color:var(--ink-muted);font-size:13px}.bb-menu__divider{block-size:1px;margin:var(--space-1) var(--space-2);background:var(--border)}.bb-menu__section{padding:8px var(--space-3) 4px;font:500 12px/16px var(--font-sans);color:var(--ink-muted)}.bb-menu__item kbd{font:500 11px/14px var(--font-sans);color:var(--ink-muted)}.bb-menu__item.is-danger,.bb-menu__item.is-danger .bb-icon{color:var(--danger)}.bb-menu__item.is-danger[data-active=true]{background:var(--danger-soft)}.bb-menuwrap{position:relative;display:inline-flex}.bb-menu--actions{min-inline-size:220px;inset-inline-start:auto;inset-inline-end:0}.bb-menuwrap--start .bb-menu--actions{inset-inline-end:auto;inset-inline-start:0}.bb-bitslive{display:block;inline-size:auto;flex:none}.bb-bitslive__mark{fill:var(--live)}.bb-bitslive__word{fill:var(--live-ink)}.bb-livecard__brand.bb-bitslive{direction:ltr}@property --hex-ga{syntax: "<angle>"; inherits: true; initial-value: 135deg;}.bb-course__hex,.bb-lecture__num{position:relative;isolation:isolate}.bb-course__hex:before,.bb-lecture__num:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:-1;clip-path:var(--hex-clip);background:var(--hex-fill);transform:rotate(0);transition:transform var(--dur-slow) var(--ease-standard),--hex-ga var(--dur-slow) var(--ease-standard)}.bb-course.is-interactive:hover .bb-course__hex:before,.bb-lecture:not(.is-locked):hover .bb-lecture__num:before{transform:rotate(-60deg);--hex-ga: 195deg;transition:transform var(--dur-slower) var(--ease-spring),--hex-ga var(--dur-slower) var(--ease-spring)}@media (prefers-reduced-motion: reduce){.bb-course__hex:before,.bb-lecture__num:before{transition:none!important}}.bb-btn,.bb-iconbtn{position:relative;isolation:isolate;--bw: 0px;--btn-edge: transparent;--btn-fill: transparent;--btn-light: none}.bb-btn__bg{position:absolute;top:0;right:0;bottom:0;left:0;z-index:-1;pointer-events:none;clip-path:polygon(var(--cut, 3.5px) 0,calc(100% - var(--cut, 3.5px)) 0,100% 25%,100% 75%,calc(100% - var(--cut, 3.5px)) 100%,var(--cut, 3.5px) 100%,0 75%,0 25%);background:var(--btn-edge)}.bb-iconbtn .bb-btn__bg{clip-path:var(--hex-clip)}.bb-btn__bg:before,.bb-btn__bg:after{content:"";position:absolute;inset:var(--bw);--ic: calc(var(--cut) - var(--bw) * .866);clip-path:polygon(var(--ic) 0,calc(100% - var(--ic)) 0,100% 25%,100% 75%,calc(100% - var(--ic)) 100%,var(--ic) 100%,0 75%,0 25%)}.bb-iconbtn .bb-btn__bg:before,.bb-iconbtn .bb-btn__bg:after{clip-path:var(--hex-clip)}.bb-btn__bg:before{background:var(--btn-fill)}.bb-btn__bg:after{background:var(--btn-light);opacity:0;transition:opacity var(--dur-fast) var(--ease-standard)}.bb-btn:hover:not(:disabled) .bb-btn__bg:after,.bb-iconbtn:hover:not(:disabled) .bb-btn__bg:after{opacity:1}.bb-btn:hover:not(:disabled) .bb-btn__bg,.bb-iconbtn:hover:not(:disabled) .bb-btn__bg{background:var(--btn-edge-hover, var(--btn-edge))}.bb-btn--primary,.bb-iconbtn--primary{color:var(--on-brand);--btn-fill: var(--primary);--btn-light: radial-gradient(160px circle at var(--bx, 50%) var(--by, 50%), var(--brand-indigo) 0%, var(--brand-blue) 100%)}.bb-btn--primary:active:not(:disabled),.bb-iconbtn--primary:active:not(:disabled){--btn-light: radial-gradient(220px circle at var(--bx, 50%) var(--by, 50%), var(--theory-deep) 0%, var(--brand-indigo) 45%, var(--brand-blue) 100%)}.bb-btn--primary:hover:not(:disabled),.bb-iconbtn--primary:hover:not(:disabled){filter:drop-shadow(0 6px 10px color-mix(in srgb,var(--brand-indigo) 30%,transparent))}.bb-btn--secondary,.bb-iconbtn--secondary{--bw: 1px;--btn-edge: var(--border-strong);--btn-fill: var(--surface-card);--btn-edge-hover: radial-gradient(70px circle at var(--bx, 50%) var(--by, 50%), var(--brand-blue), transparent 80%) var(--border-strong);--btn-light: 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