.book-chapter-reading{--book-chapter-sticky-offset:calc(var(--book-reading-header-block-size,var(--site-header-compact-block-size)) + var(--space-4));align-items:start;gap:var(--space-8);grid-template-columns:minmax(180px,230px) minmax(0,1fr);inline-size:100%;min-inline-size:0;display:grid}.book-chapter-reading__body{min-inline-size:0}.book-chapter-reading__body:only-child{grid-column:1/-1}.book-chapter-contents{max-block-size:calc(100dvh - var(--book-chapter-sticky-offset) - var(--space-4));border-inline-end:var(--border-surface);scrollbar-width:thin;padding-inline-end:var(--space-4);position:sticky;inset-block-start:var(--book-chapter-sticky-offset);overflow:auto}.book-chapter-contents__desktop-title{margin:0 0 var(--space-4);font-size:var(--font-size-lg)}.book-chapter-contents ol{gap:var(--space-1);margin:0;padding:0;list-style:none;display:grid}.book-chapter-contents li{margin:0}.book-chapter-contents a{padding:var(--space-2);color:var(--color-text);font-family:var(--font-body);font-size:var(--font-size-base);overflow-wrap:break-word;border-inline-start:3px solid #0000;border-radius:6px;font-weight:600;line-height:1.85;text-decoration:none;display:block}.book-chapter-contents__child{border-inline-start:var(--border-surface);padding-inline-start:var(--space-2);margin-inline-start:var(--space-2)!important}.book-chapter-contents__child a{color:var(--ink-soft);font-weight:400;line-height:1.9}.book-chapter-contents a:hover{background:var(--color-surface-elevated);color:var(--brand-blue)}.book-chapter-contents a:focus-visible{outline:2px solid var(--brand-blue);outline-offset:2px}.book-chapter-contents a[aria-current=location]{border-inline-start-color:var(--brand-teal);background:var(--color-surface-elevated);font-weight:600}.book-chapter-contents__toggle{display:none}.book-takeaway{text-align:center;border:1px solid #c1c1c1;border-radius:.5rem;inline-size:auto;padding:.6rem;font-size:1.3rem;font-weight:600}.book-chapter-reading [id]{scroll-margin-block-start:var(--book-chapter-sticky-offset)}@media (max-width:1199px){.book-reading-page:has(.book-reading-controls) .book-chapter-reading{--book-chapter-sticky-offset:calc(var(--book-reading-header-block-size,var(--site-header-compact-block-size)) + var(--book-reading-controls-block-size,44px) + var(--space-4))}}.book-chapter-reading [data-book-citation]{white-space:nowrap;text-underline-offset:.25em;unicode-bidi:isolate}.book-chapter-reading [data-book-reference]:focus{outline:2px solid var(--brand-teal);outline-offset:var(--space-2)}.book-chapter-reading [data-book-reference-back]{font-size:var(--font-size-sm);margin-block-end:var(--space-6);display:block}@media (min-width:851px){.book-chapter-contents__panel[hidden]{display:block}}@media (max-width:850px){.book-chapter-reading{gap:var(--space-6);grid-template-columns:minmax(0,1fr)}.book-chapter-contents{border:var(--border-surface);border-radius:8px;max-block-size:none;padding:0;position:static;overflow:visible}.book-chapter-contents__desktop-title{display:none}.book-chapter-contents__toggle{align-items:center;gap:var(--space-3);min-block-size:56px;inline-size:100%;padding:var(--space-4);color:inherit;font:inherit;text-align:start;cursor:pointer;background:0 0;border:0;border-radius:8px;display:flex}.book-chapter-contents__toggle span:first-child{font-family:var(--font-heading);font-weight:650;font-size:var(--font-size-md)}.book-chapter-contents__toggle span:nth-child(2){font-size:var(--font-size-sm);color:var(--brand-blue);margin-inline-start:auto}.book-chapter-contents__panel{padding:var(--space-3);border-block-start:var(--border-surface)}.book-chapter-contents__panel[hidden]{display:none}.book-chapter-contents a{min-block-size:44px}}