/* Bounded reader styles. Shared theme/navigation remain owned by the site. */
#dsf-book{--dsfb-paper:#f7fafc;--dsfb-accent:#296e74;--dsfb-shadow:#1c2b3420;width:min(1320px,calc(100% - 80px));margin:0 auto;padding:0 0 60px;color:var(--ink,#1c2b34);font-family:var(--sans,Arial,sans-serif)}
#dsf-book *{box-sizing:border-box}
#dsf-book [hidden]{display:none!important}
#dsf-book button,#dsf-book input,#dsf-book a,#dsf-book summary{touch-action:manipulation;-webkit-tap-highlight-color:transparent}
#dsf-book button{color:inherit;font:inherit;cursor:pointer;border-radius:0;background:transparent}
#dsf-book button:disabled{cursor:default;opacity:.4}
#dsf-book button:focus-visible,#dsf-book a:focus-visible,#dsf-book input:focus-visible,#dsf-book summary:focus-visible,#dsf-book [tabindex]:focus-visible{outline:3px solid var(--dsfb-accent);outline-offset:4px}
#dsf-book .dsfb-intro{position:relative;padding:38px 0 32px;isolation:isolate}
#dsf-book .dsfb-intro:after{content:'';position:absolute;right:35px;top:60px;width:150px;height:150px;background:url('/brand/icons/emblem.svg') center/contain no-repeat;opacity:.045;z-index:-1;pointer-events:none}
#dsf-book .dsfb-crumbs{display:flex;gap:10px;align-items:center;font-size:13px;color:var(--muted);margin-bottom:24px}
#dsf-book .dsfb-crumbs a{text-decoration:underline;text-underline-offset:3px}
#dsf-book .dsfb-kicker{font-size:13px;letter-spacing:.13em;text-transform:uppercase;font-weight:700;color:var(--muted);margin:0 0 12px}
#dsf-book h1{font:700 clamp(2.8rem,4.6vw,4.9rem)/1.05 Arial,sans-serif;letter-spacing:-.025em;text-transform:none;max-width:900px;margin:0 0 18px;color:var(--ink)}
#dsf-book .dsfb-lede{font-size:17px;color:var(--muted);margin:0}
#dsf-book .dsfb-fallback-note{font-size:14px;margin:19px 0 0;color:var(--muted)}
#dsf-book.dsfb-enhanced .dsfb-fallback-note{display:none}
#dsf-book .dsfb-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 0 13px}
#dsf-book .dsfb-toolbar p{font-size:13px;color:var(--muted);margin:0}
#dsf-book .dsfb-toolbar>div{display:flex;gap:22px}
#dsf-book .dsfb-toolbar button{border:0;min-height:44px;font-size:13px;padding:8px 0;display:flex;gap:12px;align-items:center}
#dsf-book .dsfb-toolbar button:hover{text-decoration:underline;text-underline-offset:5px}
#dsf-book .dsfb-chapters{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:4px;padding:0 12px;align-items:end}
#dsf-book .dsfb-chapters button{border:1px solid var(--line);border-bottom:0;min-height:57px;line-height:1.3;font-size:13px;padding:10px 7px;background:var(--surface,#e9edf0);color:var(--muted);position:relative}
#dsf-book .dsfb-chapters button[aria-current="true"]{min-height:64px;color:var(--ink);background:var(--dsfb-paper);box-shadow:inset 0 3px var(--dsfb-accent);font-weight:700}
#dsf-book .dsfb-chapters button[aria-current="true"]:after{content:'';position:absolute;bottom:-3px;left:0;right:0;height:4px;background:var(--dsfb-paper);z-index:2}
#dsf-book .dsfb-reader{border:1px solid var(--line);background:var(--dsfb-paper);box-shadow:3px 5px 0 var(--dsfb-shadow),0 18px 0 -10px var(--line);scroll-margin-top:190px}
#dsf-book .dsfb-spread{position:relative;display:grid;grid-template-columns:1fr 1fr;min-height:475px;isolation:isolate}
#dsf-book .dsfb-spread:after{content:'';position:absolute;left:calc(50% - 10px);width:26px;top:0;bottom:0;background:linear-gradient(90deg,transparent,#7b786313,#fff4,#57645016,transparent);pointer-events:none}
#dsf-book .dsfb-visual-page{padding:28px 32px 30px;min-width:0}
#dsf-book .dsfb-chapter-label{font:700 13px/1.4 Arial,sans-serif;letter-spacing:.09em;text-transform:uppercase;border-left:4px solid var(--dsfb-accent);padding-left:10px;margin:0 0 22px;color:var(--ink)}
#dsf-book .dsfb-chapter-art{height:205px;position:relative;border:1px solid var(--line);background:radial-gradient(#1e394f20 .7px,transparent .8px),linear-gradient(115deg,#cbd9de,#eff4f3 55%,#b9cdd4);background-size:6px 6px,auto;display:grid;place-items:center;overflow:hidden}
#dsf-book .dsfb-brand-mark{width:85px;height:85px;position:relative;z-index:1;opacity:.75;filter:none}
#dsf-book .dsfb-orbit{width:310px;height:310px;position:absolute;border:1px solid #5b7a8780;transform:rotate(-28deg) skewX(-15deg);border-radius:50%}
#dsf-book .dsfb-orbit-a{width:360px;height:140px}
#dsf-book .dsfb-orbit-b{width:200px;height:340px;transform:rotate(28deg)}
#dsf-book .dsfb-art-label{position:absolute;left:15px;bottom:12px;font-size:13px;letter-spacing:.08em;text-transform:uppercase;max-width:80%;color:#274553}
#dsf-book .dsfb-art-note{font-size:13px;line-height:1.5;color:var(--muted);margin:9px 0 0}
#dsf-book .dsfb-visual{margin:0}
#dsf-book .dsfb-visual img{display:block;width:100%;height:auto;object-fit:contain;border:1px solid var(--line)}
#dsf-book .dsfb-visual figcaption{font-size:13px;line-height:1.6;color:var(--muted);margin-top:9px}
#dsf-book #dsfb-story-title{font:700 clamp(1.8rem,2.7vw,2.7rem)/1.1 Arial,sans-serif;letter-spacing:-.02em;text-transform:none;color:var(--ink);margin:24px 0 0;max-width:560px}
#dsf-book .dsfb-spread[data-dsfb-tone="quiet"] #dsfb-story-title{font-family:var(--serif,Georgia,serif);font-weight:400;font-style:normal;text-transform:none;line-height:1.14}
#dsf-book .dsfb-story-page{padding:27px 40px 32px;min-width:0;display:flex;align-items:flex-start;flex-direction:column}
#dsf-book .dsfb-story-meta{display:flex;align-items:center;justify-content:space-between;gap:20px;width:100%;border-bottom:1px solid var(--line);padding-bottom:13px;margin-bottom:26px}
#dsf-book .dsfb-story-meta>span{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--dsfb-accent);font-weight:700}
#dsf-book .dsfb-save{display:flex;align-items:center;gap:7px;border:0;padding:5px;min-height:44px;font-size:13px}
#dsf-book .dsfb-save svg{width:15px;height:19px}
#dsf-book .dsfb-save[aria-pressed="true"]{color:var(--dsfb-accent);font-weight:700}
#dsf-book .dsfb-save[aria-pressed="true"] svg{fill:var(--surface2)}
#dsf-book .dsfb-hook{font:22px/1.65 var(--serif,Georgia,serif);color:var(--ink);margin:0 0 30px}
#dsf-book .dsfb-read-link{display:inline-flex;gap:27px;align-items:center;background:var(--ink);color:var(--dsfb-paper);font:700 13px/1.5 Arial,sans-serif;letter-spacing:.02em;padding:14px 19px;min-height:47px;box-shadow:3px 3px 0 var(--dsfb-accent);text-decoration:none}
#dsf-book .dsfb-read-link:hover{filter:brightness(1.1);text-decoration:underline;text-underline-offset:4px}
#dsf-book .dsfb-sources{margin-top:26px;width:100%;border-top:1px solid var(--line)}
#dsf-book .dsfb-sources summary{cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:15px;min-height:46px;font-size:13px;list-style:none}
#dsf-book .dsfb-sources summary::-webkit-details-marker{display:none}
#dsf-book .dsfb-sources[open] summary span{transform:rotate(45deg)}
#dsf-book .dsfb-sources p,#dsf-book .dsfb-sources li{font-size:13px;line-height:1.7;color:var(--muted)}
#dsf-book .dsfb-sources p{margin:8px 0 15px}
#dsf-book .dsfb-sources ul{list-style:none;padding:0;margin:0}
#dsf-book .dsfb-sources li{border-top:1px solid var(--line);padding:10px 0;margin:0}
#dsf-book .dsfb-sources a{text-decoration:underline;text-underline-offset:3px;color:var(--ink);overflow-wrap:anywhere}
#dsf-book .dsfb-pager{border-top:1px solid var(--line);display:grid;grid-template-columns:1fr minmax(0,1fr) 1fr;align-items:center;padding:17px 27px;gap:20px}
#dsf-book .dsfb-pager button{border:0;font-size:13px;min-height:44px;display:flex;align-items:center;gap:14px;padding:5px 0}
#dsf-book .dsfb-pager button:last-child{justify-content:flex-end}
#dsf-book .dsfb-pager>span{text-align:center;font:italic 13px/1.4 var(--serif,Georgia,serif);color:var(--muted)}
#dsf-book .dsfb-chapter-note{font-size:13px;line-height:1.7;color:var(--muted);margin:29px 0 10px;max-width:840px}
#dsf-book .dsfb-storage{font-size:13px;line-height:1.7;color:var(--muted);margin:0 0 31px}
#dsf-book .dsfb-storage button{border:0;text-decoration:underline;text-underline-offset:3px;font-size:13px;min-height:44px;padding:7px 0;margin-left:6px}
#dsf-book .dsfb-index{margin:12px 0 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
#dsf-book .dsfb-index>summary{font:30px/1.2 var(--serif,Georgia,serif);letter-spacing:-.03em;cursor:pointer;padding:24px 0;min-height:72px}
#dsf-book .dsfb-index-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px 50px;padding:5px 0 30px}
#dsf-book .dsfb-index-group h3{font:22px/1.3 var(--serif,Georgia,serif);letter-spacing:-.02em;margin:10px 0 15px;color:var(--ink)}
#dsf-book .dsfb-index-group ul{list-style:none;padding:0;margin:0}
#dsf-book .dsfb-index-group li{border-top:1px solid var(--line);padding:0;margin:0}
#dsf-book .dsfb-index-group a{display:block;padding:12px 0;font-size:14px;line-height:1.5;text-decoration:underline;text-underline-offset:3px;color:var(--ink);min-height:44px}
#dsf-book .dsfb-edition-note{font-size:13px;color:var(--muted);margin:24px 0 0;max-width:780px}
#dsf-book .dsfb-dialog{position:fixed;background:var(--dsfb-paper);color:var(--ink);border:1px solid var(--line);padding:0;width:min(760px,calc(100% - 30px));max-height:88vh;box-shadow:0 30px 90px #10232e55}
#dsf-book .dsfb-dialog::backdrop{background:#142a36b5;backdrop-filter:blur(4px)}
#dsf-book .dsfb-dialog-top{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:26px 28px 17px;border-bottom:1px solid var(--line)}
#dsf-book .dsfb-dialog-top h2{font:32px/1.15 var(--serif,Georgia,serif);letter-spacing:-.03em;margin:0}
#dsf-book .dsfb-dialog-top button{border:1px solid var(--line);border-radius:50%;width:44px;height:44px;min-width:44px;font-size:26px;display:grid;place-items:center;line-height:1}
#dsf-book .dsfb-search-label{display:block;margin:20px 28px 7px;font-size:13px}
#dsf-book .dsfb-search{display:block;width:calc(100% - 56px);margin:0 28px 14px;min-height:48px;background:transparent;color:var(--ink);border:1px solid var(--line);padding:12px 14px;font:16px Arial,sans-serif}
#dsf-book .dsfb-filters{display:flex;gap:10px;padding:0 28px}
#dsf-book .dsfb-filters button{border:1px solid var(--line);min-height:44px;padding:8px 15px;font-size:13px;border-radius:24px}
#dsf-book .dsfb-filters button[aria-pressed="true"]{background:var(--ink);color:var(--dsfb-paper)}
#dsf-book .dsfb-result-count{font-size:13px;color:var(--muted);margin:16px 28px 8px}
#dsf-book .dsfb-results{padding:0 28px 25px;max-height:45vh;overflow-y:auto;overscroll-behavior:contain}
#dsf-book .dsfb-result-group h3{font:700 13px/1.4 Arial,sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:25px 0 10px}
#dsf-book .dsfb-result{border-top:1px solid var(--line);padding:10px 0}
#dsf-book .dsfb-result button{display:flex;align-items:center;justify-content:space-between;gap:20px;text-align:left;width:100%;border:0;min-height:44px;font:18px/1.35 var(--serif,Georgia,serif);padding:0}
#dsf-book .dsfb-result button[aria-current="true"]{color:var(--dsfb-accent)}
#dsf-book .dsfb-result>a{font-size:13px;text-decoration:underline;text-underline-offset:3px;display:inline-flex;align-items:center;min-height:44px;color:var(--muted)}
#dsf-book .dsfb-empty{font-size:14px;color:var(--muted);margin:24px 0}
#dsf-book .dsfb-live{font-size:13px;color:var(--dsfb-accent);min-height:0;margin:0}
#dsf-book .dsfb-live:not(:empty){margin:10px 0 20px}
html[data-theme="dark"] #dsf-book{--dsfb-paper:#192a35;--dsfb-accent:#a8d2da;--dsfb-shadow:#0005}
html[data-theme="dark"] #dsf-book .dsfb-chapter-art{background:radial-gradient(#d5ecf115 .7px,transparent .8px),linear-gradient(115deg,#213e4e,#385866 55%,#243d50);background-size:6px 6px,auto}
html[data-theme="dark"] #dsf-book .dsfb-brand-mark{filter:brightness(0) invert(1);opacity:.7}
html[data-theme="dark"] #dsf-book .dsfb-art-label{color:#d0e1e9}
html[data-theme="dark"] #dsf-book .dsfb-orbit{border-color:#aac9d45c}
html[data-theme="dark"] #dsf-book .dsfb-spread:after{background:linear-gradient(90deg,transparent,#0002,#fff1,#0002,transparent)}
html[data-theme="dark"] #dsf-book .dsfb-intro:after{filter:brightness(0) invert(1);opacity:.05}
@media(max-width:1100px){#dsf-book{width:calc(100% - 48px)}#dsf-book .dsfb-chapters button{font-size:13px;padding-inline:5px}#dsf-book .dsfb-visual-page{padding:25px 25px 28px}#dsf-book .dsfb-story-page{padding:24px 29px 28px}#dsf-book .dsfb-hook{font-size:20px}#dsf-book .dsfb-chapter-art{height:190px}#dsf-book .dsfb-reader{scroll-margin-top:140px}}
@media(max-width:800px){#dsf-book .dsfb-intro{padding-top:30px}#dsf-book .dsfb-intro:after{width:110px;height:110px;right:0;top:75px}#dsf-book .dsfb-chapters{display:flex;overflow-x:auto;overflow-y:hidden;padding:3px 4px 0;scrollbar-width:thin}#dsf-book .dsfb-chapters button{min-width:120px;min-height:52px}#dsf-book .dsfb-chapters button[aria-current="true"]{min-height:59px}#dsf-book .dsfb-visual-page{padding:22px}#dsf-book .dsfb-story-page{padding:21px 25px 25px}#dsf-book .dsfb-hook{font-size:18px}#dsf-book .dsfb-chapter-art{height:175px}#dsf-book #dsfb-story-title{font-size:28px}#dsf-book .dsfb-story-meta{margin-bottom:20px}#dsf-book .dsfb-pager{padding:12px 21px;gap:12px}#dsf-book .dsfb-pager button{font-size:13px;gap:9px}#dsf-book .dsfb-pager>span{font-size:13px}}
@media(max-width:580px){#dsf-book{width:calc(100% - 32px);padding-bottom:38px}#dsf-book .dsfb-intro{padding:25px 0}#dsf-book .dsfb-crumbs{font-size:13px;margin-bottom:24px}#dsf-book .dsfb-kicker{font-size:13px}#dsf-book h1{font-size:43px;line-height:1;max-width:330px;margin-bottom:17px}#dsf-book .dsfb-lede{font-size:14px;max-width:270px}#dsf-book .dsfb-toolbar{flex-wrap:wrap;gap:1px}#dsf-book .dsfb-toolbar p{font-size:13px}#dsf-book .dsfb-toolbar>div{gap:18px}#dsf-book .dsfb-toolbar button{font-size:13px}#dsf-book .dsfb-spread{display:block;min-height:0}#dsf-book .dsfb-spread:after{display:none}#dsf-book .dsfb-visual-page{padding:23px 21px 22px}#dsf-book .dsfb-chapter-art{height:185px}#dsf-book #dsfb-story-title{font-size:32px}#dsf-book .dsfb-story-page{padding:0 22px 24px}#dsf-book .dsfb-story-meta{border-top:1px solid var(--line);padding:8px 0;margin-bottom:19px}#dsf-book .dsfb-hook{font-size:20px;line-height:1.65}#dsf-book .dsfb-pager{grid-template-columns:1fr 1fr;padding:12px 18px}#dsf-book .dsfb-pager>span{display:none}#dsf-book .dsfb-reader{scroll-margin-top:110px}#dsf-book .dsfb-chapter-note{font-size:13px;margin-top:25px}#dsf-book .dsfb-storage{font-size:13px;margin-bottom:24px}#dsf-book .dsfb-storage button{font-size:13px;margin-left:0}#dsf-book .dsfb-index>summary{font-size:26px;padding:22px 0}#dsf-book .dsfb-index-grid{grid-template-columns:1fr;gap:15px}#dsf-book .dsfb-index-group h3{font-size:21px}#dsf-book .dsfb-index-group a{font-size:14px}#dsf-book .dsfb-edition-note{font-size:13px}#dsf-book .dsfb-dialog-top{padding:22px 21px 16px}#dsf-book .dsfb-dialog-top h2{font-size:27px}#dsf-book .dsfb-search-label{margin-inline:21px}#dsf-book .dsfb-search{width:calc(100% - 42px);margin-inline:21px}#dsf-book .dsfb-filters{padding-inline:21px}#dsf-book .dsfb-result-count{margin-inline:21px}#dsf-book .dsfb-results{padding-inline:21px}#dsf-book .dsfb-result button{font-size:17px}}
html[data-effects="off"] #dsf-book *,html[data-effects="off"] #dsf-book *:before,html[data-effects="off"] #dsf-book *:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
@media(prefers-reduced-motion:reduce){#dsf-book *,#dsf-book *:before,#dsf-book *:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media(forced-colors:active){#dsf-book .dsfb-intro:after,#dsf-book .dsfb-orbit,#dsf-book .dsfb-spread:after{display:none}#dsf-book .dsfb-chapter-art{background:Canvas}#dsf-book .dsfb-brand-mark{filter:none}#dsf-book .dsfb-read-link{border:1px solid CanvasText;box-shadow:none}#dsf-book .dsfb-chapters button[aria-current="true"]{border-top:4px solid Highlight}}

#dsf-book .dsfb-save-mark{display:block;width:18px;height:21px;flex-shrink:0;background:currentColor;mask:url("/brand/icons/editorial-save.svg") center/contain no-repeat}

/* Fine diagram labels remain available at full size on small screens. */
#dsf-book .dsfb-visual figcaption a{display:inline-block;color:inherit;text-decoration:underline;text-underline-offset:.18em;font-weight:650;padding:.3em 0}
#dsf-book .dsfb-visual figcaption a:focus-visible{outline:3px solid var(--dsfb-accent);outline-offset:3px}

/* Name the discovery before asking the reader to interpret its image. */
#dsf-book .dsfb-visual-page #dsfb-story-title{margin-top:12px;margin-bottom:24px}