/* Expandable book navigation; page text and photos remain the original book content. */
.c101-nav-branch{display:inline-flex;align-items:center}
.c101-dropdown-toggle{display:inline-flex;align-items:center;justify-content:center;border:0;background:transparent;width:32px;min-height:44px;padding:0;color:inherit}
.c101-nav-chevron{width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:translateY(-2px) rotate(45deg);transition:transform .15s}
.is-open>.c101-dropdown-toggle .c101-nav-chevron{transform:translateY(2px) rotate(225deg)}
.is-open>.c101-nav-root,.is-open>.c101-dropdown-toggle{color:var(--red)}
.c101-dropdown{position:absolute;top:100%;left:50%;transform:translateX(-50%);width:min(1200px,calc(100vw - 48px));max-height:var(--dropdown-height,80dvh);overflow-y:auto;overscroll-behavior:contain;padding:24px 30px 28px;background:white;color:var(--ink);border:1px solid var(--line);border-top:3px solid var(--red);box-shadow:0 18px 35px #0002;font-weight:400;scrollbar-gutter:stable}
.c101-dropdown--knots{width:min(760px,calc(100vw - 48px))}
.c101-dropdown-intro{display:grid;grid-template-columns:1fr auto;align-items:center;gap:6px 25px;padding-bottom:19px;margin-bottom:20px;border-bottom:1px solid var(--line)}
.c101-dropdown-intro>.eyebrow{grid-column:1;font-size:10px}
.c101-dropdown-title{font:700 25px/1.2 var(--heading);letter-spacing:-.035em;grid-column:1}
.desktop-nav .c101-dropdown .c101-nav-overview{grid-column:2;grid-row:1/3;font-size:12px;font-weight:700;padding:10px 0;white-space:nowrap;border-bottom:1px solid var(--red)}
.c101-module-columns{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px}
.c101-nav-unit h2{margin-bottom:14px;padding-top:12px;border-top:3px solid var(--accent);min-height:64px;display:flex;flex-direction:column;gap:5px;font-size:20px;letter-spacing:-.025em}
.c101-nav-unit h2>.eyebrow{font-size:10px;letter-spacing:.12em;color:var(--accent)}
.c101-dropdown ul{margin:0;padding:0;list-style:none}
.desktop-nav .c101-dropdown li>a,.mobile-nav .c101-dropdown li>a{display:flex;gap:10px;align-items:baseline;padding:7px 8px;margin:0 -8px;font-size:12px;line-height:1.4;font-weight:500;border-radius:2px;text-wrap:pretty}
.c101-nav-number{font-size:10px;font-variant-numeric:tabular-nums;color:#777;min-width:19px}
.desktop-nav .c101-dropdown li>a:hover,.desktop-nav .c101-dropdown li>a:focus-visible,.mobile-nav .c101-dropdown li>a:hover,.mobile-nav .c101-dropdown li>a:focus-visible{background:var(--soft);color:var(--red)}
.desktop-nav .c101-dropdown a[aria-current]:after{display:none}
.c101-knot-columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 38px}
.c101-nav-references{display:flex;gap:30px;border-top:1px solid var(--line);margin-top:22px!important;padding-top:14px!important}
.c101-nav-references a{font-weight:700!important}
.c101-hero-slide{opacity:0;transition:opacity .6s ease;pointer-events:none;user-select:none}
.c101-hero-slide.is-current{opacity:1}
.hero-photo:after{pointer-events:none}
.c101-slideshow-toggle{position:absolute;left:22px;bottom:20px;z-index:2;background:#141414b8;color:#fff;border:1px solid #ffffff7a;border-radius:2px;padding:8px 11px;min-height:40px;font-size:11px;letter-spacing:.02em}
.c101-slideshow-toggle:hover{background:#141414ed}
.c101-slideshow-toggle:focus-visible{outline-color:white}
.hero-photo[data-slideshow] figcaption{bottom:75px;left:24px;right:auto;max-width:calc(100% - 48px)}
@media(max-width:1250px) and (min-width:1001px){.desktop-nav,.desktop-nav .c101-menu{gap:14px!important}.c101-dropdown-toggle{width:24px}.c101-dropdown{padding:20px 24px}.c101-module-columns{gap:24px}}
@media(max-width:1000px){
 .desktop-nav{display:none}.menu-trigger{display:block}.search-trigger span{display:none}
 .mobile-nav{max-height:calc(100dvh - 110px);overflow-y:auto;overscroll-behavior:contain}
 .mobile-nav .c101-nav-branch{display:flex;flex-wrap:wrap;width:100%}
 .mobile-nav .c101-nav-root{flex:1}.mobile-nav .c101-dropdown-toggle{width:48px;min-height:48px}
 .mobile-nav .c101-dropdown{position:static;transform:none;width:100%;max-height:none;overflow:visible;padding:18px 20px 24px;background:var(--soft);border:0;border-top:2px solid var(--red);box-shadow:none;margin-bottom:8px;scrollbar-gutter:auto}
 .mobile-nav .c101-dropdown-intro{display:block;padding-bottom:16px;margin-bottom:20px}
 .mobile-nav .c101-dropdown-title{font-size:23px;margin-top:6px}
 .mobile-nav .c101-nav-overview{padding:8px 0;font-size:13px;color:var(--red)}
 .mobile-nav .c101-module-columns{grid-template-columns:1fr;gap:26px}
 .mobile-nav .c101-nav-unit h2{min-height:0;margin-bottom:9px}
 .mobile-nav .c101-dropdown li>a{font-size:14px;padding:10px 8px;min-height:42px}
 .mobile-nav .c101-knot-columns{grid-template-columns:1fr}
 .mobile-nav .c101-nav-references{display:block}
}
@media(prefers-reduced-motion:reduce){.c101-hero-slide,.c101-nav-chevron{transition:none}}
@media print{.c101-slideshow-toggle{display:none}}
/* Module 18: ordinary links work with JavaScript disabled, too. */
.book-content .c101-gear-link{display:inline-block;padding:4px 0;text-indent:0;text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}
.book-content .c101-gear-link:hover{text-decoration-thickness:2px}
.book-content .c101-gear-link:focus-visible{outline:2px solid currentColor;outline-offset:4px}
.c101-gear-target{display:block;scroll-margin-top:24px;outline:none}
.book-content p:has(>.c101-gear-target:target){background:var(--soft,#f6f6f6);box-shadow:-4px 0 var(--red,#d4210e)}
/* Reserve image space during long jumps; intrinsic sizes are in the book HTML. */
.book-content:has(.c101-gear-link) .book-image-link{width:100%}
.book-content:has(.c101-gear-link) .book-image-link img{width:100%}
.book-content p:has(>.c101-gear-target){font-size:clamp(26px,2.2vw,34px);font-weight:700;line-height:1.2;margin-bottom:14px}
.book-layout>.layout-row:has(>.layout-cell>p>.c101-gear-target)>.layout-cell:first-child{flex:0 0 185px;background:#f6f5f2;display:flex;align-items:center}
.book-layout>.layout-row:has(>.layout-cell>p>.c101-gear-target)>.layout-cell:first-child>.minor-heading{font-size:19px;line-height:1.5;letter-spacing:.06em;margin:0}
.book-layout>.layout-row:has(>.layout-cell>p>.c101-gear-target)>.layout-cell:first-child>.minor-heading strong:last-child{font-size:34px;letter-spacing:-.025em}
@media(max-width:700px){.book-layout>.layout-row:has(>.layout-cell>p>.c101-gear-target)>.layout-cell:first-child{flex-basis:100%}.book-layout>.layout-row:has(>.layout-cell>p>.c101-gear-target)>.layout-cell:first-child>.minor-heading{font-size:17px}.book-layout>.layout-row:has(>.layout-cell>p>.c101-gear-target)>.layout-cell:first-child>.minor-heading strong:last-child{font-size:30px}}
@media(max-width:700px){.c101-gear-target{scroll-margin-top:148px}}