@layer appbooks-reset{*,:before,:after{box-sizing:border-box}html{min-width:20rem;color:var(--ab-color-text-primary);background:var(--ab-color-background);font-family:var(--ab-font-body);line-height:var(--ab-leading-body);scrollbar-gutter:stable}body{overflow-wrap:anywhere;margin:0}body[data-scroll-locked=true]{overflow:hidden}img,svg{max-width:100%}button,input,select,textarea{font:inherit}:where(a,button,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--ab-color-focus);outline-offset:3px;box-shadow:var(--ab-focus-ring)}[hidden]{display:none!important}}@layer appbooks-foundations{:root{--ab-color-background:#f7f8fa;--ab-color-surface:#fff;--ab-color-surface-muted:#eef1f5;--ab-color-text-primary:#172033;--ab-color-text-secondary:#556176;--ab-color-border:#cfd5df;--ab-color-accent:#315fa8;--ab-color-accent-strong:#24477f;--ab-color-on-accent:#fff;--ab-color-success:#286846;--ab-color-warning:#805600;--ab-color-danger:#a33131;--ab-color-info:#315fa8;--ab-color-focus:#0a65cc;--ab-space-1:.25rem;--ab-space-2:.5rem;--ab-space-3:.75rem;--ab-space-4:1rem;--ab-space-6:1.5rem;--ab-space-8:2rem;--ab-space-12:3rem;--ab-space-16:4rem;--ab-font-body:ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--ab-font-editorial:var(--ab-font-body);--ab-font-functional:var(--ab-font-body);--ab-text-display:clamp(2rem, 6vw, 3.75rem);--ab-text-title:clamp(1.5rem, 3vw, 2.25rem);--ab-text-body:1rem;--ab-text-small:.875rem;--ab-leading-tight:1.15;--ab-leading-body:1.6;--ab-content-reading:68ch;--ab-content-wide:76rem;--ab-content-gutter:var(--ab-space-4);--ab-radius-small:.25rem;--ab-radius-medium:.5rem;--ab-border-width:1px;--ab-shadow-overlay:0 1rem 3rem #17203333;--ab-focus-ring:0 0 0 3px color-mix(in srgb, var(--ab-color-focus) 35%, transparent);--ab-touch-target:2.75rem;--ab-header-height:4rem;--ab-bottom-nav-height:4.25rem}@media (width>=48rem){:root{--ab-content-gutter:var(--ab-space-8)}}}@layer appbooks-components{.ab-container{width:min(100% - (2 * var(--ab-content-gutter)), var(--ab-content-wide));margin-inline:auto}.ab-container[data-width=reading]{max-width:var(--ab-content-reading)}.ab-stack{gap:var(--ab-stack-space,var(--ab-space-4));flex-direction:column;min-width:0;display:flex}.ab-stack[data-space=small]{--ab-stack-space:var(--ab-space-2)}.ab-stack[data-space=large]{--ab-stack-space:var(--ab-space-8)}.ab-surface{min-width:0;padding:var(--ab-space-6);border:var(--ab-border-width) solid var(--ab-color-border);border-radius:var(--ab-radius-medium);background:var(--ab-color-surface)}.ab-surface[data-tone=muted]{background:var(--ab-color-surface-muted)}.ab-button,.ab-icon-button{min-height:var(--ab-touch-target);justify-content:center;align-items:center;gap:var(--ab-space-2);border:var(--ab-border-width) solid transparent;border-radius:var(--ab-radius-small);font-family:var(--ab-font-functional);cursor:pointer;font-weight:700;line-height:1;text-decoration:none;display:inline-flex}.ab-button{width:fit-content;padding:var(--ab-space-3) var(--ab-space-4)}.ab-button[data-hierarchy=primary]{color:var(--ab-color-on-accent);background:var(--ab-color-accent)}.ab-button[data-hierarchy=primary]:hover{background:var(--ab-color-accent-strong)}.ab-button[data-hierarchy=secondary]{color:var(--ab-color-text-primary);border-color:var(--ab-color-border);background:var(--ab-color-surface)}.ab-button[data-hierarchy=quiet]{color:var(--ab-color-accent-strong);background:0 0}.ab-button:disabled,.ab-icon-button:disabled{opacity:.55;cursor:not-allowed}.ab-text-link{color:var(--ab-color-accent-strong);text-underline-offset:.2em;font-weight:650}.ab-icon-button{width:var(--ab-touch-target);color:var(--ab-color-text-primary);border-color:var(--ab-color-border);background:var(--ab-color-surface);padding:0}.ab-badge{width:fit-content;min-height:1.75rem;padding-inline:var(--ab-space-2);border:var(--ab-border-width) solid var(--ab-color-border);border-radius:var(--ab-radius-small);color:var(--ab-color-text-secondary);background:var(--ab-color-surface-muted);font-family:var(--ab-font-functional);font-size:var(--ab-text-small);align-items:center;font-weight:700;display:inline-flex}.ab-callout{gap:var(--ab-space-3);padding:var(--ab-space-4);border:var(--ab-border-width) solid var(--ab-callout-color,var(--ab-color-info));border-radius:var(--ab-radius-small);background:var(--ab-color-surface);border-inline-start-width:.25rem;grid-template-columns:auto minmax(0,1fr);display:grid}.ab-callout[data-tone=success]{--ab-callout-color:var(--ab-color-success)}.ab-callout[data-tone=warning]{--ab-callout-color:var(--ab-color-warning)}.ab-callout[data-tone=danger]{--ab-callout-color:var(--ab-color-danger)}.ab-web-header{min-height:var(--ab-header-height);border-bottom:var(--ab-border-width) solid var(--ab-color-border);background:var(--ab-color-surface)}.ab-web-header__inner{min-height:var(--ab-header-height);justify-content:space-between;align-items:center;gap:var(--ab-space-4);display:flex}.ab-brand-mark{color:var(--ab-color-text-primary);font-family:var(--ab-font-functional);font-weight:800;text-decoration:none}.ab-web-header__desktop{display:none}.ab-web-header__nav-list,.ab-footer__list,.ab-bottom-nav__list{margin:0;padding:0;list-style:none}.ab-web-header__nav-list{align-items:center;gap:var(--ab-space-6);display:flex}.ab-web-header__nav-list a{color:var(--ab-color-text-primary);font-family:var(--ab-font-functional);text-decoration:none}.ab-mobile-drawer__layer{z-index:50;position:fixed;inset:0}.ab-mobile-drawer__backdrop{background:#17203394;border:0;position:absolute;inset:0}.ab-mobile-drawer__panel{width:min(90vw,24rem);padding:max(var(--ab-space-4), env(safe-area-inset-top)) var(--ab-space-6) max(var(--ab-space-6), env(safe-area-inset-bottom));background:var(--ab-color-surface);box-shadow:var(--ab-shadow-overlay);position:absolute;inset:0 0 0 auto;overflow-y:auto}.ab-mobile-drawer__top{justify-content:space-between;align-items:center;gap:var(--ab-space-4);display:flex}.ab-mobile-drawer__nav{margin-block:var(--ab-space-8)}.ab-mobile-drawer__nav a{min-height:var(--ab-touch-target);color:var(--ab-color-text-primary);font-family:var(--ab-font-functional);align-items:center;font-weight:700;text-decoration:none;display:flex}.ab-web-main{min-height:55vh}.ab-section{padding-block:var(--ab-space-12)}.ab-section+.ab-section{border-top:var(--ab-border-width) solid var(--ab-color-border)}.ab-footer{padding-block:var(--ab-space-8);border-top:var(--ab-border-width) solid var(--ab-color-border);color:var(--ab-color-text-secondary);background:var(--ab-color-surface-muted)}.ab-footer__grid{gap:var(--ab-space-6);display:grid}.ab-footer__list{gap:var(--ab-space-2);display:grid}.ab-app-shell{background:var(--ab-color-background);min-height:100dvh}.ab-app-header{z-index:10;border-bottom:var(--ab-border-width) solid var(--ab-color-border);background:color-mix(in srgb, var(--ab-color-surface) 94%, transparent);-webkit-backdrop-filter:blur(.75rem);backdrop-filter:blur(.75rem);position:sticky;top:0}.ab-app-header__inner{min-height:var(--ab-header-height);grid-template-columns:minmax(var(--ab-touch-target), auto) minmax(0, 1fr) minmax(var(--ab-touch-target), auto);align-items:center;gap:var(--ab-space-3);display:grid}.ab-app-header__title{font-family:var(--ab-font-functional);text-overflow:ellipsis;white-space:nowrap;margin:0;font-size:1rem;line-height:1.3;overflow:hidden}.ab-app-header__brand{color:var(--ab-color-text-primary);font-family:var(--ab-font-functional);font-size:var(--ab-text-small);font-weight:800;line-height:1.2;text-decoration:none;display:inline-flex}.ab-app-header__context{color:var(--ab-color-text-secondary);font-size:var(--ab-text-small);margin:0}.ab-app-content{padding-block:var(--ab-space-8) calc(var(--ab-space-8) + var(--ab-app-bottom-offset,0px))}.ab-app-shell[data-has-bottom-nav=true]{--ab-app-bottom-offset:calc(var(--ab-bottom-nav-height) + env(safe-area-inset-bottom))}.ab-bottom-nav{z-index:20;min-height:calc(var(--ab-bottom-nav-height) + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);border-top:var(--ab-border-width) solid var(--ab-color-border);background:var(--ab-color-surface);position:fixed;bottom:0;left:0;right:0}.ab-bottom-nav__list{min-height:var(--ab-bottom-nav-height);grid-template-columns:repeat(var(--ab-bottom-nav-count), minmax(0, 1fr));display:grid}.ab-bottom-nav a{min-width:var(--ab-touch-target);min-height:var(--ab-touch-target);padding:var(--ab-space-2);color:var(--ab-color-text-secondary);font-family:var(--ab-font-functional);font-size:var(--ab-text-small);text-align:center;justify-content:center;align-items:center;font-weight:700;text-decoration:none;display:flex}.ab-bottom-nav a[aria-current=page]{color:var(--ab-color-accent-strong);box-shadow:inset 0 3px 0 var(--ab-color-accent)}.ab-state{max-width:var(--ab-content-reading);padding:var(--ab-space-6);border:var(--ab-border-width) solid var(--ab-color-border);border-radius:var(--ab-radius-medium);background:var(--ab-color-surface)}.ab-state__symbol{color:var(--ab-state-color,var(--ab-color-info));font-size:1.25rem;font-weight:900}.ab-state[data-state=error]{--ab-state-color:var(--ab-color-danger)}.ab-state[data-state=empty]{--ab-state-color:var(--ab-color-text-secondary)}.ab-loading-indicator{border:3px solid var(--ab-color-border);border-top-color:var(--ab-color-info);border-radius:50%;width:1.25rem;height:1.25rem;animation:.8s linear infinite ab-spin}.ab-validation-message{gap:var(--ab-space-2);margin-block:var(--ab-space-1);color:var(--ab-color-danger);font-size:var(--ab-text-small);font-weight:650;display:flex}@media (width>=48rem){.ab-web-header__desktop{align-items:center;gap:var(--ab-space-6);display:flex}.ab-mobile-drawer{display:none}.ab-footer__grid{grid-template-columns:minmax(0,2fr) minmax(0,1fr)}.ab-section{padding-block:var(--ab-space-16)}.ab-bottom-nav{right:var(--ab-space-4);bottom:var(--ab-space-4);width:min(32rem, calc(100% - (2 * var(--ab-space-4))));border:var(--ab-border-width) solid var(--ab-color-border);border-radius:var(--ab-radius-medium);box-shadow:var(--ab-shadow-overlay);padding-bottom:0;left:auto}}.ab-web-header[data-sticky=true]{z-index:40;position:sticky;top:0}.ab-footer__groups{gap:var(--ab-space-2);display:grid}.ab-footer__group{min-width:0}.ab-footer__group--desktop{display:none}.ab-footer__group--mobile{border-bottom:var(--ab-border-width) solid var(--ab-color-border)}.ab-footer__group--mobile summary{min-height:var(--ab-touch-target);padding-block:var(--ab-space-3);color:var(--ab-color-text-primary);font-family:var(--ab-font-functional);cursor:pointer;font-weight:750}.ab-footer__group--mobile nav{padding-block:0 var(--ab-space-4)}.ab-footer__group h2{margin:0 0 var(--ab-space-3);color:var(--ab-color-text-primary);font-family:var(--ab-font-functional);font-size:var(--ab-text-body)}.ab-responsive-media{margin:0}.ab-responsive-media img{object-fit:var(--ab-media-object-fit,cover);object-position:var(--ab-media-object-position,50% 50%);width:100%;height:auto;display:block}.ab-responsive-media figcaption{color:var(--ab-color-text-secondary);font-size:var(--ab-text-small);margin-block-start:var(--ab-space-2)}.ab-faq{border-top:var(--ab-border-width) solid var(--ab-color-border)}.ab-faq__item{border-bottom:var(--ab-border-width) solid var(--ab-color-border)}.ab-faq__item summary{min-height:var(--ab-touch-target);padding-block:var(--ab-space-3);color:var(--ab-color-text-primary);font-family:var(--ab-font-functional);cursor:pointer;font-weight:750}.ab-faq__answer{max-width:var(--ab-content-reading);padding-block:0 var(--ab-space-4);color:var(--ab-color-text-secondary)}.ab-faq__answer>:last-child{margin-block-end:0}.ab-back-to-top{z-index:30;right:max(var(--ab-space-4), env(safe-area-inset-right));bottom:max(var(--ab-space-4), env(safe-area-inset-bottom));width:var(--ab-touch-target);min-width:var(--ab-touch-target);height:var(--ab-touch-target);min-height:var(--ab-touch-target);border:var(--ab-border-width) solid transparent;border-radius:var(--ab-radius-medium);color:var(--ab-color-on-accent);background:var(--ab-color-accent);box-shadow:var(--ab-shadow-overlay);cursor:pointer;place-items:center;padding:0;display:inline-grid;position:fixed}.ab-back-to-top:hover{background:var(--ab-color-accent-strong)}@media (width>=48rem){.ab-footer__grid[data-has-groups=true]{grid-template-columns:minmax(14rem,1fr) minmax(0,2fr)}.ab-footer__groups{gap:var(--ab-space-6);grid-template-columns:repeat(auto-fit,minmax(9rem,1fr))}.ab-footer__group--desktop{display:block}.ab-footer__group--mobile{display:none}.ab-footer__secondary{grid-column:2}}}@layer appbooks-utilities{.ab-skip-link{z-index:100;top:var(--ab-space-2);left:var(--ab-space-2);padding:var(--ab-space-3) var(--ab-space-4);color:var(--ab-color-on-accent);background:var(--ab-color-accent-strong);position:fixed;transform:translateY(-150%)}.ab-skip-link:focus{transform:translateY(0)}.ab-visually-hidden{clip:rect(0 0 0 0)!important;white-space:nowrap!important;border:0!important;width:1px!important;height:1px!important;margin:-1px!important;padding:0!important;position:absolute!important;overflow:hidden!important}.ab-reading-width{max-width:var(--ab-content-reading)}.ab-functional-text{font-family:var(--ab-font-functional)}.ab-editorial-text{font-family:var(--ab-font-editorial)}}@keyframes ab-spin{to{transform:rotate(1turn)}}@media 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