/* Existing white-paper reader, with current chapter access in both viewports. */
@media(min-width:1000px){.history-book-layout{grid-template-columns:minmax(0,790px) minmax(224px,268px);gap:36px;max-width:1094px;margin-inline:auto}.book-toc{grid-column:2;grid-row:1}.book-body{grid-column:1;grid-row:1;min-width:0}}
.g5-chapter-bar{display:none}.book-chapter{scroll-margin-top:calc(var(--g5-topbar-height,40px) + 72px)}.book-toc a[aria-current="location"]{font-weight:700;text-decoration:underline}.g5-back-top{display:block;text-align:right;margin:24px 0;font-size:14px}
@media(max-width:999px){.g5-chapter-bar{display:flex;position:sticky;top:var(--g5-topbar-height,40px);z-index:12;gap:12px;align-items:center;padding:10px 16px;background:#fff;border-bottom:1px solid #d9dfe3}.g5-chapter-bar label{white-space:nowrap;font-size:14px}.g5-chapter-bar select{min-width:0;max-width:100%;font:inherit;flex:1}.book-toc{position:static}.evidence-drawer{max-width:100vw;box-sizing:border-box}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* M5 edition responsibility: a flat reading note, not a competing card. */
.edition-panel{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:28px;margin-top:30px;padding-top:18px;border-top:1px solid var(--line);color:#3f5055}
.edition-panel p{max-width:720px;margin:0;font:13px/1.72 var(--sans)}
.edition-panel .edition-panel-label{margin-bottom:5px;color:#68777c;font:700 10px/1.5 var(--mono)}
.edition-panel nav{display:flex;flex-direction:column;align-items:flex-end;justify-content:flex-end;gap:7px}
.edition-panel a{color:#184758;font:12px/1.5 var(--sans);text-decoration-thickness:1px}
.edition-panel a:focus-visible{outline:2px solid #0a6d8e;outline-offset:3px}
@media(max-width:720px){.edition-panel{grid-template-columns:1fr;gap:14px}.edition-panel nav{align-items:flex-start}}