/* Book View — per-book 3-panel canvas (navigator | manuscript | inspector). */

.book-body { overflow: hidden; background: var(--bg-primary); }

#book-app {
  display: grid;
  grid-template-columns: var(--nav-w, 300px) minmax(0, 1fr) var(--insp-w, 340px);
  height: 100vh;
  width: 100%;
}

/* Focus mode: collapse both side panels, center the manuscript. */
#book-app.focus { grid-template-columns: 0 minmax(0, 1fr) 0; }
#book-app.focus .book-nav,
#book-app.focus .book-inspector {
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
}

/* ---- Left: navigator ---- */
.book-nav {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.bn-header {
  padding: 14px 14px 10px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.back-link { color: var(--text-secondary); text-decoration: none; font-size: 0.76rem; }
.back-link:hover { color: var(--accent-hover); }

.book-picker,
#nav-search {
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: 7px;
  padding: 8px 10px;
  font-size: 0.84rem;
  font-family: inherit;
}
.book-picker { font-family: var(--font-serif); font-size: 0.95rem; }
.book-picker:focus, #nav-search:focus { outline: none; border-color: var(--accent); }

.bn-groups { flex: 1; overflow-y: auto; padding: 8px 6px 20px; }

.nav-group { margin-bottom: 4px; }

.nav-group-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: transparent;
  border: 0;
  color: var(--text-secondary);
  font-size: 0.68rem;
  letter-spacing: 1.3px;
  text-transform: uppercase;
  padding: 10px 10px 5px;
}
.nav-group-head:hover { color: var(--text-primary); }
.nav-group-head .count { opacity: 0.7; font-size: 0.66rem; }
.nav-group.collapsed .nav-group-items { display: none; }
.nav-group-head .chevron { transition: transform 0.15s; }
.nav-group.collapsed .nav-group-head .chevron { transform: rotate(-90deg); }

.nav-item {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.3;
  cursor: pointer;
}
.nav-item:hover { color: var(--text-primary); background: var(--bg-tertiary); }
.nav-item.active { color: var(--accent-hover); background: var(--accent-soft); font-weight: 500; }

.nav-item .ni-title { display: block; }
.nav-item .ni-chip {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0 6px;
  margin-left: 6px;
}
.nav-item .ni-chip.shared { color: var(--accent-hover); border-color: var(--accent); opacity: 0.85; }

.nav-empty { padding: 14px 12px; color: var(--text-secondary); font-size: 0.84rem; }

/* ---- Center: manuscript ---- */
.book-manuscript {
  display: grid;
  grid-template-rows: 46px minmax(0, 1fr);
  min-width: 0;
  background: var(--bg-primary);
}

.bm-bar {
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 18px;
}
.bm-bar-left { min-width: 0; display: flex; align-items: center; gap: 8px; overflow: hidden; }
.bm-book { font-family: var(--font-serif); font-size: 0.98rem; color: var(--text-primary); white-space: nowrap; }
.bm-sep { color: var(--text-secondary); }
.bm-chapter { color: var(--text-secondary); font-size: 0.86rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bm-bar-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.bm-words { font-size: 0.74rem; color: var(--text-secondary); white-space: nowrap; }

.bm-action {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 20px;
  padding: 5px 13px;
  font-size: 0.76rem;
  text-decoration: none;
  white-space: nowrap;
}
.bm-action:hover { color: var(--text-primary); border-color: var(--accent); }

/* Shared with the canvas: small ghost icon button. */
.icon-btn {
  width: 32px;
  height: 32px;
  display: inline-grid;
  place-items: center;
  background: transparent;
  border: 0;
  color: var(--text-secondary);
  border-radius: 6px;
  cursor: pointer;
}
.icon-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }

.bm-scroll { overflow-y: auto; padding: 26px 0 60vh; scroll-behavior: smooth; }
.bm-loading { color: var(--text-secondary); text-align: center; padding: 40px; }

.chapter { max-width: 760px; margin: 0 auto; padding: 0 40px 40px; }
.chapter + .chapter { border-top: 1px solid var(--border); padding-top: 34px; margin-top: 10px; }

.chapter-marker {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}
.chapter-marker h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--text-primary);
}
.chapter-marker .cm-meta { font-size: 0.74rem; color: var(--text-secondary); white-space: nowrap; }

/* Manuscript prose uses the serif reading face. */
.chapter .markdown-body {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  line-height: 1.85;
  max-width: none;
}
.chapter .markdown-body p { margin: 0 0 1em; }

/* ---- Right: inspector ---- */
.book-inspector {
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.bi-header {
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.bi-header h2 { font-family: var(--font-serif); font-size: 1.02rem; }
.bi-body { flex: 1; overflow-y: auto; padding: 16px; }

.bi-meta { list-style: none; margin: 0 0 14px; padding: 0; font-size: 0.82rem; }
.bi-meta li { display: flex; justify-content: space-between; gap: 10px; padding: 5px 0; border-bottom: 1px solid var(--border); }
.bi-meta .k { color: var(--text-secondary); }
.bi-meta .v { color: var(--text-primary); text-align: right; }
.bi-meta .v code { font-size: 0.78rem; }

.bi-edit {
  display: inline-block;
  margin-bottom: 14px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  color: var(--accent-hover);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: none;
}
.bi-edit:hover { background: var(--accent); color: #fff; }

.bi-entry .markdown-body { max-width: none; font-size: 0.9rem; line-height: 1.6; }
.bi-hint { color: var(--text-secondary); font-size: 0.84rem; line-height: 1.55; }

/* ---- Responsive ---- */
@media (max-width: 1080px) {
  #book-app { grid-template-columns: 260px minmax(0, 1fr) 300px; }
}
@media (max-width: 860px) {
  .book-body { overflow: auto; }
  #book-app { display: flex; flex-direction: column; height: auto; min-height: 100vh; }
  .book-nav { max-height: 40vh; border-right: 0; border-bottom: 1px solid var(--border); }
  .book-inspector { border-left: 0; border-top: 1px solid var(--border); min-height: 280px; }
  #book-app.focus { display: flex; }
}