/* Hallmark · pre-emit critique: P4 H5 E4 S5 R5 V4
 * genre: editorial · macrostructure: reader with chapter rail · design-system: DESIGN.md · designed-as-app */
body.book-view { --rail-width: 280px; }
#course-outline .book-track-switch { display: flex; gap: var(--space-sm); margin-bottom: var(--space-sm); }
#course-outline .book-track-switch a { flex: 1; justify-content: center; border: 1px solid var(--color-rule); background: var(--color-paper); color: var(--color-ink); white-space: nowrap; }
#course-outline .book-track-switch a[aria-current="true"] { background: var(--color-tint); color: var(--color-accent); border-color: var(--color-accent); }
#course-outline .book-overview-link { margin-block: var(--space-sm) var(--space-lg); }
.book-stage-label { display: block; color: var(--color-muted); font-size: 12px; margin: 0 var(--space-sm) var(--space-sm); }
#book-stage { width: 100%; min-height: 44px; border: 1px solid var(--color-rule); border-radius: var(--radius-sm); padding: var(--space-sm); background: var(--color-surface); color: var(--color-ink); font: 14px var(--font-body); }
#course-outline .book-stage-goal { font-size: 12px; line-height: 1.7; margin: var(--space-md) var(--space-sm); }
#course-outline .book-outline { max-height: none; overflow: visible; }
#course-outline .book-outline a { align-items: baseline; gap: var(--space-sm); }
.book-outline .outline-title { white-space: normal; overflow: visible; overflow-wrap: anywhere; }
.book-pagination { display: flex; align-items: center; justify-content: space-between; gap: var(--space-sm); margin-top: var(--space-sm); padding-top: var(--space-sm); border-top: 1px solid var(--color-rule); }
.book-pagination button { min-width: 44px; min-height: 44px; padding: var(--space-sm); border: 1px solid var(--color-rule); border-radius: var(--radius-sm); background: var(--color-paper); color: var(--color-ink); font: 22px var(--font-body); cursor: pointer; }
.book-pagination button:hover:not(:disabled), .book-locate:hover { background: var(--color-tint); }
.book-pagination button:active:not(:disabled) { background: var(--color-paper-2); }
.book-pagination button:disabled { color: var(--color-muted); opacity: .5; cursor: default; }
.book-pagination span { font-size: 12px; color: var(--color-muted); white-space: nowrap; }
.book-locate { width: 100%; min-height: 44px; margin-block: var(--space-sm); border: 1px solid var(--color-rule); border-radius: var(--radius-sm); background: var(--color-paper); color: var(--color-accent); cursor: pointer; font: 13px var(--font-body); }
.book-stage-project { padding-block: var(--space-md); border-block-end: 1px solid var(--color-rule); margin-bottom: var(--space-sm); }
.book-stage-project > span { font-size: 11px; color: var(--color-muted); padding-inline: var(--space-sm); }
.book-workbook { padding: 0; background: var(--color-transparent); border: 0; }
.book-workbook > summary { font-size: 12px; min-height: 44px; padding: var(--space-md) var(--space-sm); }
.book-start { max-width: 80ch; padding-bottom: var(--space-xl); border-bottom: 1px solid var(--color-rule); }
.book-start > p { font-size: 14px; color: var(--color-muted); margin-top: var(--space-lg); }
.book-overview { max-width: 80ch; }
.book-overview h2 { font-size: 21px; margin-block: var(--space-2xl) var(--space-lg); }
.book-overview dl { margin: 0; }
.book-overview dl > div { display: flex; gap: var(--space-xl); padding-block: var(--space-md); border-bottom: 1px solid var(--color-rule); }
.book-overview dt { color: var(--color-accent); min-width: 3em; }
.book-overview dd { margin: 0; min-width: 0; }
.book-page-toc { max-width: 80ch; margin-block: var(--space-xl); padding: 0; background: var(--color-transparent); border-block: 1px solid var(--color-rule); border-inline: 0; border-radius: 0; }
.book-page-toc summary { padding-block: var(--space-md); min-height: 44px; font-size: 13px; }
.book-page-toc nav { display: flex; flex-direction: column; align-items: start; padding-bottom: var(--space-md); }
.book-page-toc a { min-height: 44px; padding-block: var(--space-sm); font-size: 13px; max-width: 100%; overflow-wrap: anywhere; }
.book-project { margin-top: 20px; padding: 20px; background: var(--color-paper-2); border-left: 3px solid var(--color-accent); }
.book-project h3 { margin: 0 0 8px; font-size: 17px; }
.book-project a { display: inline-block; padding-block: 10px; min-height: 44px; }
.book-prose { max-width: 80ch; min-width: 0; font-size: 15px; line-height: 1.95; }
.book-prose h2 { font-size: 22px; margin-top: 36px; scroll-margin-top: 100px; }
.book-prose pre { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 13px; }
.book-prose table { table-layout: fixed; }
.book-prose td, .book-prose th { overflow-wrap: anywhere; }
.book-prose .book-code { margin-block: 20px; }
.book-code button { margin-bottom: 8px; }
.book-code pre { margin-top: 0; }
.book-answer { margin-block: 24px; padding: 12px; border: 1px solid var(--color-rule); }
.book-prerequisites { max-width: 80ch; margin-block: 20px; font-size: 14px; }
.book-prerequisites a { display: inline-block; margin-right: 18px; padding-block: 8px; }
.book-prerequisites h2 { font-size: 19px; }
.book-next { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; margin-block: 36px; padding-block: 20px; border-top: 1px solid var(--color-rule); max-width: 80ch; }
.book-next a { min-height: 44px; max-width: 100%; overflow-wrap: anywhere; display: flex; flex-direction: column; gap: var(--space-sm); }
.book-next small { color: var(--color-muted); font-size: 12px; }
.book-link-list { display: flex; flex-direction: column; align-items: start; gap: 8px; margin-block: 20px; }
.book-link-list a { min-height: 44px; padding-block: 8px; max-width: 100%; overflow-wrap: anywhere; }
.book-outline h3 { font-size: 12px; color: var(--color-muted); margin: 18px 8px 5px; }
.book-legacy { margin-top: 36px; }
.book-lesson { margin-bottom: 32px; }
.book-lesson > h2 { font-size: 20px; }
@media (max-width: 600px) { .book-prose h2 { font-size: 19px; }.book-prose td,.book-prose th { padding: 8px; font-size: 13px; } }
@media (max-width: 960px) {
 #course-outline .book-outline { max-height: 40dvh; overflow: auto; }
 .book-view #menu-toggle { width: auto; min-width: 54px; font-size: 13px; padding-inline: var(--space-sm); }
}