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components{.logo{width:var(--logo-width);height:auto;display:block;overflow:visible}.logo--crest{width:var(--space-12)}.logo__navy{fill:var(--logo-navy)}.logo__orange{fill:var(--logo-orange)}.logo-sprite{width:0;height:0;position:absolute;overflow:hidden}.eyebrow,.subject-label{font-family:var(--font-display);font-size:var(--text-eyebrow);font-weight:var(--weight-extrabold);line-height:var(--leading-snug);letter-spacing:var(--tracking-caps);text-transform:var(--case-label);color:var(--text-heading);margin:0}.eyebrow--accent{color:var(--accent-strong)}.eyebrow--lg,.subject-label--lg{font-size:var(--text-eyebrow-lg)}.subject-label--dot:before{content:"";width:var(--bullet-dot);height:var(--bullet-dot);border-radius:var(--radius-full);background:var(--subject-accent);margin-inline-end:var(--space-2);display:inline-block}a.subject-label{min-height:var(--tap-min);align-items:center;text-decoration-line:none;display:inline-flex}a.subject-label:hover{color:var(--text-heading);text-decoration-line:underline}.grade-pill{height:var(--pill-height);padding-inline:var(--pill-pad);border-radius:var(--pill-radius);background:var(--subject-accent-strong);color:var(--subject-on-accent);font-family:var(--font-display);font-size:var(--text-pill);font-weight:var(--weight-bold);line-height:var(--leading-flat);white-space:nowrap;align-items:center;text-decoration-line:none;display:inline-flex;position:relative}.grade-pill--sm{font-size:var(--text-small)}.grade-pill--lg{font-size:var(--text-pill-lg)}a.grade-pill:hover{color:var(--subject-on-accent);text-decoration-line:underline}a.grade-pill:after{content:"";inset-inline:0;inset-block:calc((100% 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(forced-colors:active){.level__bar{background:graytext}.level__bar--on{background:canvastext}}.steps-block__heading{margin-block-end:var(--space-4)}.steps{gap:var(--space-4);margin:0;padding:0;list-style:none;display:grid}.steps__item{align-items:center;column-gap:var(--step-gap);grid-template-columns:auto 1fr;display:grid}.steps__num{width:var(--step-circle);height:var(--step-circle);border-radius:var(--radius-full);background:var(--subject-accent-strong);color:var(--subject-on-accent);font-family:var(--font-display);font-size:calc(var(--step-circle) * var(--step-numeral));font-weight:var(--weight-bold);line-height:var(--leading-flat);place-items:center;display:inline-grid}.steps__name{font-family:var(--font-display);font-size:var(--text-small);font-weight:var(--weight-semibold);line-height:var(--leading-snug);color:var(--text)}.steps__desc{color:var(--text);grid-column:2;margin-block-start:var(--space-1)}.steps--row{gap:var(--space-3) var(--space-5);flex-wrap:wrap;display:flex}.steps--list{gap:0}.steps--list .steps__item{align-items:start;column-gap:var(--space-4);padding-block:var(--space-4);border-block-start:var(--border-width) solid var(--border)}.steps--list .steps__item:last-child{border-block-end:var(--border-width) solid var(--border)}.steps--list .steps__num{width:var(--step-circle-lg);height:var(--step-circle-lg);font-size:calc(var(--step-circle-lg) * var(--step-numeral));font-weight:var(--weight-extrabold)}.steps--list .steps__name{font-size:var(--text-h4);font-weight:var(--weight-bold);color:var(--text-heading);align-self:center}.steps--grid{grid-template-columns:repeat(auto-fit, minmax(min(var(--card-min-wide), 100%), 1fr));gap:var(--space-4)}.steps--grid .steps__item{align-content:start;align-items:center;row-gap:var(--space-2);padding:var(--space-4);border:var(--border-width) solid var(--border);border-radius:var(--radius-box);background:var(--surface)}.steps--grid .steps__name{font-size:var(--text-body);font-weight:var(--weight-bold);color:var(--text-heading)}.steps--grid .steps__desc{font-size:var(--text-small);grid-column:1/-1;margin-block-start:0}.steps--ink .steps__num{background:var(--text);color:var(--bg)}@media (forced-colors:active){.steps__num{border:var(--border-width) solid CanvasText}}.btn{justify-content:center;align-items:center;gap:var(--space-2);min-height:var(--tap-min);padding:var(--space-2) var(--space-5);border:var(--border-width-strong) solid transparent;border-radius:var(--radius-box);font-family:var(--font-display);font-size:var(--text-body);font-weight:var(--weight-bold);line-height:var(--leading-snug);text-align:center;cursor:pointer;transition:background-color var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease), color var(--duration-fast) var(--ease);margin:0;text-decoration-line:none;display:inline-flex}.btn--primary{border-color:var(--primary);background:var(--primary);color:var(--on-primary)}.btn--primary:hover{border-color:var(--primary-hover);background:var(--primary-hover);color:var(--on-primary)}.btn--secondary{border-color:var(--primary);background:var(--surface);color:var(--text-heading)}.btn--secondary:hover{background:var(--hover-wash);color:var(--text-heading)}.btn--accent{border-color:var(--accent);background:var(--accent);color:var(--on-accent)}.btn--accent:hover{border-color:var(--accent-hover);background:var(--accent-hover);color:var(--on-accent)}.btn--quiet{color:var(--link);text-decoration-line:underline;text-decoration-thickness:var(--underline-thickness);text-underline-offset:var(--underline-offset);background:0 0;border-color:#0000;padding-inline:0}.btn--quiet:hover{color:var(--link-hover)}.btn--lg{padding:var(--space-3) var(--space-6);font-size:var(--text-lead)}.btn--block{width:100%;display:flex}.btn:active{transform:translateY(var(--border-width))}.btn:disabled,.btn[aria-disabled=true]{border-color:var(--border);background:var(--surface-sunken);color:var(--text-muted);cursor:not-allowed}.btn__arrow{width:var(--icon-sm);height:var(--icon-sm);flex:none}.tag{min-height:var(--pill-height);padding-inline:var(--pill-pad);border:var(--border-width) solid var(--border-strong);border-radius:var(--radius-full);background:var(--surface);color:var(--text);font-family:var(--font-display);font-size:var(--text-caption);font-weight:var(--weight-semibold);line-height:var(--leading-snug);align-items:center;display:inline-flex}.tag--subject{background:var(--subject-tint-1);border-color:#0000}.tag--strong{background:var(--subject-accent-strong);color:var(--subject-on-accent);border-color:#0000}.tag--quiet{background:var(--surface-sunken);border-color:#0000}.callout{padding:var(--space-5) var(--space-6);border:var(--border-width) solid var(--border);border-radius:var(--radius-box);background:var(--surface);color:var(--text)}.callout__label{font-family:var(--font-display);font-size:var(--text-eyebrow);font-weight:var(--weight-extrabold);line-height:var(--leading-snug);letter-spacing:var(--tracking-caps);text-transform:var(--case-label);color:var(--text-heading);margin-block-end:var(--space-2)}.callout__body>*+*{margin-block-start:var(--space-3)}.callout__source{color:var(--text-muted);font-size:var(--text-small);margin-block-start:var(--space-3)}.callout--quote{border-inline-start:var(--rule-width) solid var(--subject-accent-strong)}.callout--quote .callout__body{font-weight:var(--weight-semibold)}.callout--notice{border-color:var(--border-strong);background:var(--surface-muted)}.prose{max-width:var(--measure);line-height:var(--leading-prose)}.prose--wide{max-width:var(--measure-wide)}.prose>*+*{margin-block-start:var(--space-4)}.prose>h2{margin-block-start:var(--space-10)}.prose>h3,.prose>h4{margin-block-start:var(--space-8)}.prose>:first-child{margin-block-start:0}.prose ul,.prose ol{padding-inline-start:var(--space-6)}.prose li+li{margin-block-start:var(--list-row)}.prose ul{padding-inline-start:0;list-style:none}.prose ul>li,.dot-list>li{padding-inline-start:calc(var(--bullet-dot) + var(--bullet-gap));position:relative}.prose ul>li:before,.dot-list>li:before{content:"";width:var(--bullet-dot);height:var(--bullet-dot);border-radius:var(--radius-full);background:var(--subject-accent);position:absolute;inset-block-start:calc((1em * var(--leading-body) - var(--bullet-dot)) / 2);inset-inline-start:0}.prose blockquote{border-inline-start:var(--rule-width) solid var(--border);padding-inline-start:var(--space-5)}.prose .lead,.lead{font-size:var(--text-lead);line-height:var(--leading-prose)}.dot-list{gap:var(--list-row);font-weight:var(--weight-semibold);margin:0;padding:0;list-style:none;display:grid}.tile-row{align-items:center;gap:calc(var(--tile-size) * var(--tile-gap));flex-wrap:wrap;margin:0;padding-block-end:calc(var(--tile-size) * var(--tile-shade-y));display:flex}.tile{min-width:var(--tile-size);height:var(--tile-size);padding-inline:calc(var(--tile-size) * var(--tile-pad));border-radius:calc(var(--tile-size) * var(--tile-radius));background:var(--tile-face,var(--tile-navy));box-shadow:calc(var(--tile-size) * var(--tile-shade-x)) calc(var(--tile-size) * var(--tile-shade-y)) 0 var(--tile-shade,var(--tile-navy-shade));color:var(--tile-text-light);font-family:var(--font-display);font-size:calc(var(--tile-size) * var(--tile-numeral));font-weight:var(--weight-black);line-height:var(--leading-flat);rotate:var(--tile-tilt-left);place-items:center;display:inline-grid}.tile--tilt-right{rotate:var(--tile-tilt-right)}.tile--teal{--tile-face:var(--tile-teal);--tile-shade:var(--tile-teal-shade)}.tile--red{--tile-face:var(--tile-red);--tile-shade:var(--tile-red-shade)}.tile--orange{--tile-face:var(--tile-orange);--tile-shade:var(--tile-orange-shade)}.tile--yellow{--tile-face:var(--tile-yellow);--tile-shade:var(--tile-yellow-shade);color:var(--tile-text-dark)}.tile--navy{--tile-face:var(--tile-navy);--tile-shade:var(--tile-navy-shade)}.tile-chip{width:calc(var(--tile-size) * var(--tile-chip));height:calc(var(--tile-size) * var(--tile-chip));border-radius:var(--radius-full);background:var(--tile-white);box-shadow:calc(var(--tile-size) * var(--tile-shade-x)) calc(var(--tile-size) * var(--tile-shade-y)) 0 var(--tile-white-shade);color:var(--tile-text-dark);font-family:var(--font-display);font-size:calc(var(--tile-size) * var(--tile-chip) * var(--tile-chip-symbol));font-weight:var(--weight-black);line-height:var(--leading-flat);place-items:center;display:inline-grid}.tile-chip--navy{background:var(--tile-navy);box-shadow:calc(var(--tile-size) * var(--tile-shade-x)) calc(var(--tile-size) * var(--tile-shade-y)) 0 var(--tile-navy-shade);color:var(--tile-text-light)}@media (forced-colors:active){.tile,.tile-chip{border:var(--border-width-strong) solid CanvasText}}.book-cover{aspect-ratio:var(--cover-aspect);border:var(--border-width) solid var(--border-subtle);border-radius:var(--radius-sm);background:var(--cover-ground);box-shadow:var(--shadow-cover);display:block;overflow:hidden}.book-cover img{object-fit:cover;width:100%;height:100%;display:block}.book-cover--flat{box-shadow:none}.sample-page{gap:var(--space-3);margin:0;display:grid}.sample-page__frame{aspect-ratio:var(--cover-aspect);border:var(--border-width) solid var(--border);border-radius:var(--radius-sm);background:var(--paper);box-shadow:var(--shadow-raised);display:block;overflow:hidden}.sample-page__frame img{object-fit:contain;width:100%;height:100%;display:block}.sample-page__caption{color:var(--text-muted);font-size:var(--text-small)}.sample-page__caption strong{color:var(--text);font-weight:var(--weight-semibold)}.book-grid{grid-template-columns:repeat(auto-fill, minmax(min(var(--card-min), 100%), 1fr));gap:var(--space-8) var(--space-4);margin:0;padding:0;list-style:none;display:grid}.book-grid__item{display:flex}.book-card{line-height:var(--leading-body);gap:var(--space-3);flex-direction:column;width:100%;display:flex;position:relative}.book-card__cover{transition:transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease)}.book-card__body{gap:var(--space-2);flex-direction:column;flex:1;display:flex}.book-card__subject{font-size:var(--text-micro)}.book-card__title{font-size:var(--text-small);font-weight:var(--weight-extrabold);line-height:var(--leading-snug);text-transform:none;text-wrap:pretty}.book-card__link{color:var(--text-heading);text-decoration-line:none}.book-card__link:after{content:"";inset:calc(var(--space-2) * -1);border-radius:var(--radius-card);position:absolute}.book-card__link:hover{color:var(--text-heading)}.book-card:hover .book-card__link{text-decoration-line:underline}.book-card:hover .book-card__cover{transform:translate(calc(var(--shade-offset-x) * -1), calc(var(--shade-offset-y) * -1));box-shadow:var(--shade-offset-x) var(--shade-offset-y) 0 var(--subject-tint-2)}.book-card__link:focus-visible{outline:none}.book-card__link:focus-visible:after{outline:var(--focus-ring-width) solid var(--focus-ring);outline-offset:0}.book-card__subtitle{color:var(--text);font-size:var(--text-caption);line-height:var(--leading-snug)}.book-card__meta{align-items:center;gap:var(--space-2) var(--space-3);flex-wrap:wrap;margin-block-start:auto;padding-block-start:var(--space-1);display:flex}@media (width>=40rem){.book-grid{grid-template-columns:repeat(auto-fill, minmax(var(--card-min-wide), 1fr));gap:var(--space-10) var(--space-6)}.book-card__title{font-size:var(--text-h4)}.book-card__subtitle{font-size:var(--text-small)}}.availability{gap:var(--space-2);max-width:var(--measure);padding:var(--space-4) var(--space-5);border:var(--border-width) solid var(--border-strong);border-radius:var(--radius-box);background:var(--surface);display:grid}.availability__status{align-items:center;gap:var(--space-2);font-family:var(--font-display);font-size:var(--text-h4);font-weight:var(--weight-extrabold);line-height:var(--leading-snug);color:var(--text-heading);display:flex}.availability__mark{width:var(--bullet-dot);height:var(--bullet-dot);border:var(--border-width-strong) solid var(--text-heading);border-radius:var(--radius-full);flex:none}.availability--available .availability__mark{background:var(--text-heading)}.availability__text{color:var(--text)}.availability__action{margin-block-start:var(--space-2)}.breadcrumbs__list{align-items:center;gap:0 var(--space-2);color:var(--text-muted);font-size:var(--text-small);flex-wrap:wrap;margin:0;padding:0;list-style:none;display:flex}.breadcrumbs__item{align-items:center;gap:var(--space-2);min-height:var(--tap-min);display:inline-flex}.breadcrumbs__link{min-height:var(--tap-min);align-items:center;display:inline-flex}.breadcrumbs__current{color:var(--text);font-weight:var(--weight-semibold)}.wave-band{width:100%;height:var(--wave-height);line-height:0;display:block}.wave-band svg{width:100%;height:100%;display:block}.wave-band--flip svg{transform:scaleX(-1)}.wave-band--sm{height:calc(var(--wave-height) / 2)}.wave-band__1{fill:var(--subject-wave-1)}.wave-band__2{fill:var(--subject-wave-2)}.wave-band__3{fill:var(--subject-wave-3)}.wave-band__4{fill:var(--subject-wave-4)}.u-flow>*+*{margin-block-start:var(--flow,var(--space-4))}.u-stack{align-content:start;gap:var(--stack);display:grid}.u-cluster{align-items:center;gap:var(--space-3) var(--space-4);flex-wrap:wrap;display:flex}.u-measure{max-width:var(--measure)}.u-muted{color:var(--text-muted)}.u-small{font-size:var(--text-small)}.u-display{font-size:var(--text-display);font-weight:var(--weight-black);line-height:var(--leading-display);text-transform:var(--case-display)}.u-h2{font-size:var(--text-h2);font-weight:var(--weight-extrabold);line-height:var(--leading-heading);text-transform:none}.u-h3{font-size:var(--text-h3);font-weight:var(--weight-bold);line-height:var(--leading-heading);text-transform:none}.facts{border-block-start:var(--border-width) solid var(--border);margin:0;display:grid}.facts__row{gap:var(--space-4);padding-block:var(--space-3);border-block-end:var(--border-width) solid var(--border);grid-template-columns:minmax(0,2fr) minmax(0,3fr);align-items:baseline;display:grid}.facts__term{color:var(--text-muted);font-family:var(--font-display);font-size:var(--text-small);font-weight:var(--weight-bold);line-height:var(--leading-snug)}.facts__value{color:var(--text);font-weight:var(--weight-semibold);line-height:var(--leading-body);margin:0}.facts--inline{gap:var(--space-2) var(--space-8);border:0;flex-wrap:wrap;display:flex}.facts--inline .facts__row{border:0;grid-template-columns:none;gap:0;padding:0;display:grid}.modules{gap:var(--space-3);margin:0;padding:0;list-style:none;display:grid}.modules__item{align-items:center;gap:var(--space-4);padding:var(--space-3) var(--space-4);border:var(--border-width) solid var(--border);border-radius:var(--radius-box);background:var(--surface);display:flex}.modules__num{width:var(--module-num);height:var(--module-num);border-radius:var(--pill-radius);background:var(--subject-accent-strong);color:var(--subject-on-accent);font-family:var(--font-display);font-size:var(--text-h4);font-weight:var(--weight-black);line-height:var(--leading-flat);flex:none;place-items:center;display:inline-grid}.modules__text{gap:var(--space-1);min-width:0;display:grid}.modules__title{color:var(--text-heading);font-family:var(--font-display);font-weight:var(--weight-bold);line-height:var(--leading-snug)}.modules__pages{color:var(--text-muted);font-size:var(--text-small);line-height:var(--leading-snug)}.contents{margin:0;padding:0;list-style:none;display:grid}.contents__item{gap:var(--space-1);padding-block:var(--space-3);border-block-end:var(--border-width) solid var(--border-subtle);display:grid}.contents__line{align-items:baseline;gap:var(--space-2);display:flex}.contents__label{color:var(--text-heading);font-family:var(--font-display);font-weight:var(--weight-bold);line-height:var(--leading-snug)}.contents__leader{min-width:var(--space-4);border-block-end:var(--border-width-strong) dotted var(--border);transform:translateY(calc(var(--space-1) * -1));flex:1}.contents__where{color:var(--text);font-size:var(--text-small);font-weight:var(--weight-semibold);font-variant-numeric:tabular-nums;flex:none}.contents__note{max-width:var(--measure);color:var(--text-muted);font-size:var(--text-small);line-height:var(--leading-body)}.disclosure-group{border-block-start:var(--border-width) solid var(--border)}.disclosure{border-block-end:var(--border-width) solid var(--border)}.disclosure__summary{justify-content:space-between;align-items:center;gap:var(--space-4);min-height:var(--tap-min);padding-block:var(--space-4);color:var(--text-heading);font-family:var(--font-display);font-size:var(--text-h4);font-weight:var(--weight-bold);line-height:var(--leading-snug);cursor:pointer;list-style:none;display:flex}.disclosure__summary::-webkit-details-marker{display:none}.disclosure__summary:hover .disclosure__text{text-decoration-line:underline;text-decoration-thickness:var(--underline-thickness);text-underline-offset:var(--underline-offset)}.disclosure__icon{width:var(--step-circle);height:var(--step-circle);border:var(--border-width-strong) solid var(--primary);border-radius:var(--radius-full);transition:background-color var(--duration-fast) var(--ease);flex:none;position:relative}.disclosure__icon:before,.disclosure__icon:after{content:"";width:45%;height:var(--border-width-strong);border-radius:var(--radius-full);background:var(--primary);transition:transform var(--duration) var(--ease);position:absolute;inset:50% auto auto 50%;transform:translate(-50%,-50%)}.disclosure__icon:after{transform:translate(-50%,-50%)rotate(90deg)}.disclosure[open] .disclosure__icon{background:var(--primary)}.disclosure[open] .disclosure__icon:before,.disclosure[open] .disclosure__icon:after{background:var(--on-primary)}.disclosure[open] .disclosure__icon:after{transform:translate(-50%,-50%)rotate(0)}.disclosure__body{max-width:var(--measure);padding-block-end:var(--space-6)}.disclosure__body>*+*{margin-block-start:var(--space-3)}.u-has-circles{isolation:isolate;position:relative;overflow:hidden}.pale-circles{z-index:-1;pointer-events:none;position:absolute;inset:0}.pale-circles__one,.pale-circles__two{border-radius:var(--radius-full);position:absolute}.pale-circles__one{width:var(--circle-1);height:var(--circle-1);background:var(--subject-tint-2)}.pale-circles__two{width:var(--circle-2);height:var(--circle-2);background:var(--subject-tint-1)}.pale-circles--end .pale-circles__one{inset-block-start:8%;inset-inline-end:calc(var(--circle-1) * -.22)}.pale-circles--end .pale-circles__two{inset-block-end:4%;inset-inline-end:calc(var(--circle-1) * .55)}.pale-circles--start .pale-circles__one{inset-block-start:10%;inset-inline-start:calc(var(--circle-1) * -.3)}.pale-circles--start .pale-circles__two{inset-block-end:6%;inset-inline-start:calc(var(--circle-1) * .45)}.pale-circles--center .pale-circles__one{inset-block-start:50%;inset-inline-start:50%;transform:translate(-58%,-50%)}.pale-circles--center .pale-circles__two{inset-block-start:50%;inset-inline-start:50%;transform:translate(10%,-10%)}.link-card{align-content:start;gap:var(--space-3);padding:var(--space-6) var(--space-6) var(--space-12);border:var(--border-width) solid var(--border);border-radius:var(--radius-card);background:var(--surface);color:var(--text);line-height:var(--leading-body);transition:transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease), border-color var(--duration) 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