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80px;background-color:var(--workspace)}.book{counter-reset:folio;display:grid;grid-template-columns:repeat(2,var(--screen-page-width));grid-auto-rows:var(--screen-page-height);width:max-content;min-width:100%;margin:0 auto;align-items:start;justify-content:center;gap:32px var(--spread-gap);zoom:var(--reader-zoom, 1)}.book-page{counter-increment:folio;position:relative;isolation:isolate;width:var(--page-width);height:var(--page-height);min-width:var(--page-width);min-height:var(--page-height);overflow:hidden;margin:0;background:var(--pi-paper);color:var(--pi-graphite-500);font-family:var(--font-sans);font-size:var(--body-size);font-weight:400;line-height:var(--body-leading);text-align:left;word-break:keep-all;overflow-wrap:break-word;line-break:strict;transform:scale(var(--reader-scale));transform-origin:top left;box-shadow:var(--shadow-page)}:where(.cover-copy h1,.unit-divider-page h1,.unit-warmup-page h2,.unit-heading h2,.page-heading h1,.page-heading h2,.section-identity 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var(--page-bottom) var(--page-outside)}.book-page.active,.book-page[aria-current=page],.book-page.is-search-hit{outline:2px solid var(--pi-ink-700);outline-offset:4px}.page-inner{display:grid;grid-template-rows:var(--baseline) minmax(0,1fr) var(--baseline);row-gap:6mm;width:100%;height:100%;min-width:0;min-height:0}.running-head{grid-row:1;display:flex;min-width:0;align-items:flex-start;justify-content:space-between;gap:var(--space-4);padding-bottom:1.4mm;border-bottom:var(--hairline) solid var(--pi-rule-strong);color:var(--pi-graphite-400);font-family:var(--font-sans);font-size:7.9pt;line-height:1.15;letter-spacing:.035em}.running-mark{color:var(--unit-accent, var(--pi-ink-700));font-family:var(--font-math);font-size:10pt;line-height:.8}.running-unit{min-width:7mm;padding-bottom:1mm;border-bottom:.5mm solid var(--unit-accent, var(--pi-ink-700));color:var(--unit-accent, var(--pi-ink-700));font-weight:700;text-align:center}.book-page:nth-child(odd) .running-head,.book-page.right-page .running-head,.book-page[data-side=right] .running-head{text-align:right}.page-content{grid-row:2;min-width:0;min-height:0;align-self:stretch}.page-footer{grid-row:3;display:flex;min-width:0;align-items:flex-end;justify-content:space-between;gap:var(--space-4);padding-top:1.4mm;border-top:var(--hairline) solid var(--pi-rule);color:var(--pi-graphite-400);font-family:var(--font-sans);font-size:7.9pt;line-height:1.1;letter-spacing:.035em}.book-page:nth-child(odd) .page-footer,.book-page.recto .page-footer,.book-page.right-page .page-footer,.book-page[data-side=right] .page-footer,.book-page:nth-child(2n) .page-footer,.book-page.verso .page-footer,.book-page.left-page .page-footer,.book-page[data-side=left] .page-footer{justify-content:space-between}.book-page:nth-child(2n) .page-number,.book-page.verso .page-number,.book-page.left-page .page-number,.book-page[data-side=left] .page-number{order:-1}.page-number{display:inline-flex;min-width:5mm;color:var(--pi-graphite-500);font-family:var(--font-sans);font-variant-numeric:lining-nums tabular-nums;font-weight:700}.page-number:empty:before{content:counter(folio)}.book-page :where(h1,h2,h3,h4,p,ul,ol,dl,blockquote,figure,table){margin-top:0}.book-page :where(h1,h2,h3,h4){color:var(--pi-graphite-600);text-wrap:pretty}.book-page h1{margin-bottom:var(--space-8);font-size:25pt;font-weight:600;line-height:1.13;letter-spacing:-.025em}.book-page h2{margin-block:var(--space-8) var(--space-4);font-size:17.5pt;font-weight:600;line-height:1.22;letter-spacing:-.02em}.book-page h3{margin-block:var(--space-6) var(--space-3);font-size:13.2pt;font-weight:600;line-height:1.28;letter-spacing:-.015em}.book-page h4{margin-block:var(--space-4) var(--space-2);font-size:10.8pt;font-weight:600;line-height:1.4}.book-page p{margin-bottom:var(--space-4);max-width:none}.book-page :where(ul,ol){margin-bottom:var(--space-4);padding-inline-start:1.4em}.book-page li+li{margin-top:var(--space-1)}.book-page strong{color:var(--pi-graphite-600);font-weight:600}.book-page code{padding:.08em .34em;border-radius:var(--radius-1);background:var(--pi-paper-3);color:var(--pi-graphite-700);font-family:var(--font-sans);font-size:.92em;word-break:break-all}.eyebrow{display:block;margin:0 0 var(--space-3);color:var(--pi-graphite-400);font-family:var(--font-sans);font-size:8.2pt;font-weight:400;line-height:1.35;letter-spacing:.055em}.deck{max-width:none;margin:0 0 var(--space-6);color:var(--pi-graphite-500);font-family:var(--font-serif);font-size:13pt;line-height:1.56;letter-spacing:-.01em}.deck>:last-child{margin-bottom:0}.page-heading{margin-bottom:var(--space-4);padding-bottom:var(--space-2);border-bottom:var(--hairline) solid var(--pi-rule-strong)}.book-page[data-unit] .page-heading{border-bottom-color:var(--unit-accent)}.page-heading h2{max-width:18em;margin:0 0 var(--space-3);font-size:21pt;line-height:1.16}.page-heading .deck{margin-bottom:var(--space-4);font-size:var(--body-size)}.standards{display:flex;min-width:0;flex-wrap:wrap;gap:var(--space-2);margin-top:var(--space-4)}.cover-page .running-head,.cover-page .page-footer,.unit-divider-page .running-head,.unit-divider-page .page-footer{display:none}.cover-page .page-inner,.unit-divider-page .page-inner{grid-template-rows:minmax(0,1fr);row-gap:0}.cover-page .page-content,.unit-divider-page .page-content{grid-row:1}.cover-page .page-content{display:flex;position:relative;isolation:isolate;height:100%;flex-direction:column;justify-content:flex-start;overflow:hidden;padding-block:var(--space-12);border-block:var(--hairline) solid var(--pi-rule-strong)}.cover-page .eyebrow{color:var(--pi-ink-700)}.cover-page h1{max-width:9em;margin-bottom:var(--space-8);font-size:37pt;font-weight:600;line-height:1.08;letter-spacing:-.035em}.cover-page .deck{max-width:25em;font-size:15pt}.cover-geometry{position:absolute;z-index:-1;inset:4mm -8mm 4mm 24mm;overflow:hidden;color:var(--pi-ink-700);opacity:.72;pointer-events:none}.cover-geometry .orbit{position:absolute;border:var(--hairline) solid var(--pi-ink-300);border-radius:50%}.cover-geometry .orbit-a{width:128mm;height:128mm;inset-block-start:16mm;inset-inline-end:-34mm}.cover-geometry .orbit-b{width:82mm;height:82mm;inset-block-end:12mm;inset-inline-end:3mm}.cover-geometry .axis{position:absolute;background:var(--pi-ink-200)}.cover-geometry .axis-x{width:148mm;height:var(--hairline);inset-block-start:51%;inset-inline-end:-12mm}.cover-geometry .axis-y{width:var(--hairline);height:196mm;inset-block-start:2mm;inset-inline-end:42mm}.cover-point{position:absolute;width:3.2mm;height:3.2mm;border:var(--hairline) solid var(--pi-white);border-radius:50%;background:var(--pi-ink-700);box-shadow:0 0 0 1mm var(--pi-ink-100)}.cover-point.point-a{inset-block-start:31%;inset-inline-end:39mm}.cover-point.point-b{inset-block-end:23%;inset-inline-end:71mm}.cover-copy{position:relative;z-index:1;width:min(115mm,78%);margin-block:auto}.cover-copy h1{max-width:none}.cover-subtitle{max-width:24em;margin:0 0 var(--space-12);color:var(--pi-ink-900);font-family:var(--font-serif);font-size:15pt;line-height:1.5}.cover-question{max-width:27em;margin:0;color:var(--pi-graphite-500);font-size:10.8pt;line-height:1.75}.cover-meta{position:relative;z-index:1;display:flex;align-items:flex-end;justify-content:space-between;gap:var(--space-4);padding-top:var(--space-4);border-top:var(--hairline) solid var(--pi-rule-strong);color:var(--pi-graphite-400);font-family:var(--font-sans);font-size:8.2pt}.cover-pi{color:var(--pi-ink-700);font-family:var(--font-math);font-size:24pt;line-height:.8}#title-page .page-content{display:grid;height:100%;grid-template-rows:minmax(0,1fr) auto;align-items:end}.title-page-lockup{align-self:center;padding-block:var(--space-12)}.title-page-lockup h1{margin-bottom:var(--space-4);font-size:34pt}.title-rule{width:44mm;height:.8mm;margin-block:var(--space-12) var(--space-8);background:var(--pi-ink-700)}.title-meta{display:grid;max-width:104mm;gap:var(--space-3);margin:0}.title-meta>div{display:grid;grid-template-columns:18mm minmax(0,1fr);gap:var(--space-4);padding-bottom:var(--space-2);border-bottom:var(--hairline) solid var(--pi-rule)}.title-meta :where(dt,dd){margin:0}.title-meta dt{color:var(--pi-graphite-400);font-family:var(--font-sans);font-size:8.2pt}.title-meta dd{color:var(--pi-graphite-600)}.unit-divider-page{background:linear-gradient(180deg,var(--pi-paper) 0 62%,var(--unit-soft) 62% 100%)}.unit-divider-page .page-content{position:relative;isolation:isolate;display:grid;height:100%;grid-template-rows:minmax(102mm,1fr) auto auto;align-content:stretch;overflow:hidden;padding-block:0 6mm;border-top:.5mm solid 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