/* Book chrome layered on top of editorial.css — nav, TOC, code blocks.
   Scoped under .doc so it inherits the design tokens. */

.doc { --brand: #ea4b71; }

/* top bar: book title (right) + chapter marker (left) */
.book-top {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem; padding-bottom: 1.1rem; margin-bottom: 2.2rem;
  border-bottom: 1px solid var(--line);
}
.book-top .brand {
  font-weight: 700; font-size: 1rem; letter-spacing: .02em;
  color: var(--fg); text-decoration: none;
}
.book-top .brand:hover { color: var(--accent); }
.book-top .brand .dot { color: var(--brand); }
.book-top .marker {
  font-size: .82rem; color: var(--fg-dim, #9fb0c9);
  letter-spacing: .04em; white-space: nowrap;
}

/* bottom prev / index / next */
.book-nav {
  display: flex; align-items: stretch; gap: .75rem;
  margin-top: 3rem; padding-top: 1.4rem; border-top: 1px solid var(--line);
}
.book-nav a, .book-nav span {
  flex: 1; display: flex; flex-direction: column; gap: .25rem;
  padding: .85rem 1rem; border: 1px solid var(--line); border-radius: 12px;
  text-decoration: none; color: var(--fg); transition: border-color .15s, background .15s;
  background: var(--ink-2);
}
.book-nav a:hover { border-color: var(--accent); background: var(--surface); }
.book-nav .dir { font-size: .72rem; color: var(--eyebrow); letter-spacing: .08em; }
.book-nav .ttl { font-size: .9rem; font-weight: 600; }
.book-nav .to-index { flex: 0 0 auto; align-items: center; justify-content: center; text-align: center; }
.book-nav .disabled { opacity: .35; pointer-events: none; }
.book-nav .next { text-align: left; }

/* code blocks */
.doc pre {
  background: #0a1120; border: 1px solid var(--line); border-radius: 12px;
  padding: 1rem 1.15rem; overflow-x: auto; margin: 1.3rem 0;
  direction: ltr; text-align: left;
}
.doc pre code {
  background: none; padding: 0; border: 0; color: #cdd7ea;
  font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: .84rem; line-height: 1.75;
}
.doc pre .c { color: #6b7a94; }   /* comment */
.doc pre .k { color: var(--brand); } /* keyword */
.doc pre .s { color: #7fd0a8; }   /* string */

/* index / TOC */
.toc { list-style: none; padding: 0; margin: 2rem 0 0; counter-reset: ch; }
.toc li { margin: 0 0 .7rem; }
.toc a {
  display: flex; align-items: baseline; gap: .9rem;
  padding: 1rem 1.15rem; border: 1px solid var(--line); border-radius: 12px;
  text-decoration: none; color: var(--fg); background: var(--ink-2);
  transition: border-color .15s, background .15s;
}
.toc a:hover { border-color: var(--accent); background: var(--surface); }
.toc .n {
  flex: 0 0 auto; font-variant-numeric: tabular-nums; font-weight: 700;
  color: var(--brand); min-width: 1.8rem;
}
.toc .meta { display: flex; flex-direction: column; gap: .2rem; }
.toc .t { font-weight: 600; font-size: 1rem; }
.toc .d { font-size: .82rem; color: var(--fg-dim, #9fb0c9); line-height: 1.6; }