/* Standalone book reader — used only by _layouts/book.html.
   Deliberately has none of the SDA site's header/topnav/sidebar chrome;
   loaded alongside main.css so it can reuse the .book-figure / .book-table /
   .book-exercises / .book-nav component styles and the site's color palette,
   but overrides page-level layout and typography for a "reading a book"
   feel instead of "browsing a website" feel. */

body.book-reader {
  background: #ddcfa8;
  font-family: Georgia, "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  color: #2b2419;
  line-height: 1.7;
}

/* Keep jumped-to headings (from the contents drawer, or any #anchor link)
   clear of the sticky top bar, which would otherwise cover them. Value
   matches the topbar's height plus a little breathing room; the mobile
   override in the media query below covers the topbar's taller wrapped
   state on narrow screens. */
html { scroll-padding-top: 90px; }

/* ============================================================
   Top bar — slim, book title + contents toggle, no site nav
   ============================================================ */
.book-topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  background: #3d2914;
  color: #f5ecd6;
  padding: 0.85rem 1.5rem;
  border-bottom: 3px solid #c9621e;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.book-topbar-title {
  color: #f5ecd6;
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.25;
}
.book-topbar-title:hover { color: #fff; text-decoration: none; }
.book-topbar-subtitle {
  display: block;
  font-weight: 400;
  font-size: 0.82rem;
  color: #d4b88a;
  max-width: 60vw;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.book-topbar-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.88rem;
}
.book-toc-toggle {
  background: #c9621e;
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 0.45rem 0.9rem;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
}
.book-toc-toggle:hover { background: #a84d12; }
.book-topbar-exit { color: #d4b88a; }
.book-topbar-exit:hover { color: #f5ecd6; }

/* ============================================================
   Contents drawer — off-canvas panel, toggled by the button above
   ============================================================ */
.book-toc-drawer {
  position: fixed;
  top: 0;
  left: -320px;
  width: 300px;
  height: 100%;
  overflow-y: auto;
  background: #fbf6e7;
  border-right: 1px solid #d9c9a3;
  box-shadow: 2px 0 12px rgba(0,0,0,0.15);
  z-index: 50;
  transition: left 0.2s ease;
  padding: 1.5rem 1rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.3;
}
.book-toc-drawer.is-open { left: 0; }
.book-toc-drawer ol {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}
.book-toc-drawer li {
  margin-bottom: 0.4rem;
}
.book-toc-drawer a, .book-toc-drawer .book-toc-placeholder {
  display: block;
  padding: 0.5rem 0.7rem;
  border-radius: 4px;
  font-size: 0.92rem;
  color: #2b2419;
}
.book-toc-drawer a:hover { background: #ede0bd; text-decoration: none; }
.book-toc-drawer li.is-current > .book-toc-row > a,
.book-toc-drawer li.is-current a { background: #ede0bd; border-left: 3px solid #c9621e; font-weight: 700; }
.book-toc-drawer .book-toc-placeholder { color: #9c8a68; }
.book-toc-drawer .book-toc-chnum { font-weight: 700; }

/* Per-chapter row: chapter link + expand/collapse toggle */
.book-toc-row {
  display: flex;
  align-items: stretch;
  gap: 0.25rem;
}
.book-toc-row a { flex: 1 1 auto; min-width: 0; }
.book-toc-expand {
  flex: 0 0 auto;
  background: none;
  border: none;
  color: #6b5a3f;
  font-size: 0.7rem;
  width: 2rem;
  cursor: pointer;
  border-radius: 4px;
  transition: transform 0.15s ease;
}
.book-toc-expand:hover { background: #ede0bd; color: #3d2914; }
.book-toc-expand[aria-expanded="true"] { transform: rotate(90deg); }

/* Nested section list, revealed per-chapter */
.book-toc-sections {
  list-style: none;
  margin: 0.15rem 0 0.5rem;
  padding: 0;
  border-left: 2px solid #d9c9a3;
  margin-left: 0.9rem;
}
.book-toc-sections li { margin-bottom: 0; }
.book-toc-sections a {
  display: block;
  padding: 0.15rem 0.6rem;
  font-size: 0.8rem;
  border-radius: 4px;
  color: #4a3c28;
}
.book-toc-sections a:hover { background: #ede0bd; text-decoration: none; }
.book-toc-sections li.book-toc-sub a { padding-left: 1.4rem; font-size: 0.76rem; color: #6b5a3f; }
.book-toc-sections li.book-toc-loading {
  padding: 0.15rem 0.6rem;
  font-size: 0.8rem;
  font-style: italic;
  color: #9c8a68;
}

/* ============================================================
   Reading column — styled as a paper page against the darker
   surrounding background, so it reads as a contained page rather
   than text floating in an open browser window.
   ============================================================ */
.book-page {
  max-width: 720px;
  margin: 2rem auto 2.5rem;
  background: #fbf6e7;
  border-left: 1px solid #c9b98a;
  border-right: 1px solid #c9b98a;
  box-shadow: 0 0 2px rgba(61,41,20,0.15), 0 12px 30px rgba(61,41,20,0.12);
  padding: 3rem 3.5rem 4rem;
}
.book-page-title {
  font-family: "Georgia", serif;
  font-size: 2.1rem;
  color: #3d2914;
  margin: 0 0 1.5rem;
  line-height: 1.25;
  border-bottom: 2px solid #c9621e;
  padding-bottom: 0.5rem;
}
.book-page h2, .book-page h3, .book-page h4 {
  font-family: "Georgia", serif;
  color: #3d2914;
  line-height: 1.3;
}
.book-page h2 { margin-top: 2.5rem; font-size: 1.5rem; }
.book-page h3 { margin-top: 2rem; font-size: 1.25rem; }
.book-page h4 { margin-top: 1.5rem; font-size: 1.08rem; }
.book-page p { margin: 0 0 1.15rem; }
.book-page ul, .book-page ol { padding-left: 1.6rem; margin-bottom: 1.15rem; }
.book-page li { margin-bottom: 0.35rem; }
.book-page a { color: #8a3a1a; }
.book-page blockquote {
  border-left: 4px solid #c9621e;
  margin: 1.25rem 0;
  padding: 0.5rem 1.25rem;
  color: #5a4a35;
  background: #f7efd8;
  font-style: italic;
}

.book-byline {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #6b5a3f;
  font-size: 0.92rem;
  margin: -1rem 0 2rem;
}

/* ============================================================
   Footer
   ============================================================ */
.book-footer {
  text-align: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 0.85rem;
  color: #6b5a3f;
  padding: 1.5rem 1rem 2.5rem;
}
.book-footer a { color: #8a3a1a; }

@media (max-width: 600px) {
  html { scroll-padding-top: 130px; }
  .book-topbar-exit { display: none; }
  .book-topbar-subtitle { max-width: 75vw; }
  .book-toc-drawer { width: 85vw; left: -85vw; }
  .book-page { margin: 0.75rem auto 1.5rem; padding: 1.75rem 1.25rem 3rem; }
  .book-page-title { font-size: 1.6rem; }
}