/* Reader geometry; plain navigation typography follows the actual NavBar source.
   Contents uses the shared ModalContainer and Select option primitives. */
:root{--book-header-height:80px}
.book-header{position:relative;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:32px;max-width:1600px;min-height:80px;margin:0 auto;padding:20px 32px}
.book-brand{display:inline-flex;align-items:center;gap:6px;min-width:0;color:var(--ah-white);text-decoration:none;font-size:16px;font-weight:500;line-height:20px;white-space:nowrap}
.book-brand img{display:block;flex:none;width:36px;height:36px;object-fit:contain}
.book-sections{display:flex;align-items:center;justify-content:flex-end;gap:20px;margin-left:auto;min-width:0}
.book-sections a{display:block;padding:8px 0;color:rgba(255,255,255,.6);text-decoration:none;font-size:16px;line-height:20px;white-space:nowrap;transition:color .3s}
.book-sections a:hover,.book-sections a[aria-current]{color:var(--ah-white)}
.book-header a:focus-visible,.book-page-navigation a:focus-visible,.book-contents summary:focus-visible,.book-contents a:focus-visible{outline:2px solid var(--ah-blue);outline-offset:5px}
.book-page-toolbar{display:flex;align-items:center;justify-content:flex-end;min-height:44px;margin:0 0 14px;position:relative;z-index:25}
.book-contents{position:relative;max-width:100%;font-size:14px;line-height:20px}
.book-contents>summary{display:block;min-height:44px;padding:12px 0;cursor:pointer;list-style:none;color:rgba(255,255,255,.6)}
.book-contents>summary::-webkit-details-marker{display:none}
.book-contents[open]>summary{color:var(--ah-white)}
.book-contents>nav{position:absolute;right:0;top:calc(100% + 4px);display:block;width:min(340px,calc(100vw - 36px));max-height:min(64svh,520px);overflow:auto;overscroll-behavior:contain;scrollbar-width:thin}
.book-contents ol{margin:0;padding:0;list-style:none}
.book-contents li{margin:0;padding:0}
.book-contents a{display:block;min-height:44px;text-decoration:none;overflow-wrap:anywhere}
.book-contents a:hover{color:var(--ah-white)}
.book-page-navigation{position:relative;display:flex;flex-direction:row;align-items:flex-end;justify-content:space-between;gap:24px;width:100%;margin:28px 0 0;padding:15px 0 max(8px,env(safe-area-inset-bottom))}
.book-page-navigation>a{display:flex;flex-direction:column;justify-content:center;gap:4px;min-width:0;min-height:44px;max-width:46%;padding:6px 0;color:rgba(255,255,255,.6);text-decoration:none;font-size:14px;line-height:20px}
.book-page-navigation>a:hover{color:var(--ah-white)}
.book-page-navigation>.book-page-next{margin-left:auto;text-align:right;align-items:flex-end}
.book-page-navigation>.book-page-previous{text-align:left;align-items:flex-start}
.book-neighbor-title{color:rgba(255,255,255,.5);font-size:11px;line-height:1.4;overflow-wrap:anywhere}
.book-page-empty{flex:0 0 1px}
.book-main{width:100%;max-width:1100px;min-width:0;min-height:calc(100svh - var(--book-header-height));margin:0 auto;padding:28px 32px 24px}
.book-main[data-page-type="skill"],.book-main[data-page-type="film"],.book-main[data-page-type="workflow"]{display:flex;flex-direction:column;align-items:stretch}
.book-main[data-page-type="skill"]>.book-page-navigation,.book-main[data-page-type="film"]>.book-page-navigation,.book-main[data-page-type="workflow"]>.book-page-navigation{margin-top:auto}
.book-main>.book-page-toolbar{flex:none}
.book-main>.book-page-navigation{flex:none}
.book-main>h1{overflow-wrap:anywhere}
@media(max-width:720px){:root{--book-header-height:calc(119px + max(0px,env(safe-area-inset-top) - 17px))}.book-header{display:grid;grid-template-columns:minmax(0,1fr);gap:14px;min-height:0;padding:max(17px,env(safe-area-inset-top)) 18px 10px}.book-sections{width:100%;margin:0;justify-content:space-between;gap:12px}.book-sections a{padding:9px 0;min-height:40px}.book-page-toolbar{margin-bottom:8px}.book-contents>summary{padding:12px 0}.book-page-navigation{margin-top:22px;gap:18px;padding-top:12px}.book-main{padding:8px 18px max(16px,env(safe-area-inset-bottom))}.book-main[data-page-type="skill"]>.book-page-navigation,.book-main[data-page-type="film"]>.book-page-navigation,.book-main[data-page-type="workflow"]>.book-page-navigation{padding-top:16px}.book-main>h1{font-size:34px;margin-bottom:15px}.book-main>.lead{font-size:16px;margin-bottom:20px}.book-main>.eyebrow{font-size:10px;margin-bottom:10px}}
@media(max-width:350px){.book-header{padding-left:16px;padding-right:16px}.book-sections{gap:8px}}