/* Contents — the table-of-contents overlay: the dimmed backdrop, the part
   accordion boxes (with their chevrons and descriptions), and the chapter
   items inside each part. Markup built by js/reader.js (buildToc). */

.overlay {
  position: fixed; inset: 0; z-index: 50;
  background: rgba(7,5,4,0.86); backdrop-filter: blur(6px);
  display: flex; justify-content: center; align-items: flex-start;
  padding: clamp(2rem, 8vh, 6rem) 1.2rem; overflow-y: auto;
  opacity: 0; pointer-events: none; transition: opacity .35s;
}
.overlay.open { opacity: 1; pointer-events: auto; }
.toc { width: 100%; max-width: 44rem; }
.toc-head {
  display: flex; justify-content: space-between; align-items: baseline;
  border-bottom: 1px solid var(--line); padding-bottom: 1rem; margin-bottom: 2rem;
}
.toc-head h2 { font-family: var(--display); font-weight: 500; font-size: 2rem; color: var(--ink); }
/* reading progress, sitting in the panel header between the title and close
   (the .toc-head flex with space-between centres it between the two) */
.toc-progress {
  font-family: var(--display); font-size: 1rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ash);
}
.toc-close { font-size: 1.6rem; color: var(--ash); background: none; border: 0; cursor: pointer; line-height: 1; }
.toc-close:hover { color: var(--ember); }
.toc-part-box {
  border: 1px solid var(--line); border-radius: 4px; overflow: hidden;
  margin-bottom: 0.9rem; background: rgba(255,255,255,0.015);
  transition: border-color .2s;
}
.toc-part-box.open { border-color: rgba(226,86,43,0.35); }
.toc-part-toggle {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  width: 100%; text-align: left; background: none; border: 0; cursor: pointer;
  padding: 1rem 1.1rem;
}
.toc-chapter-label {
  font-family: var(--display); color: var(--ember); font-weight: 600;
  letter-spacing: 0.28em; text-transform: uppercase; font-size: 0.78rem;
}
.toc-chev { color: var(--ash); font-size: 0.85rem; transition: transform .25s, color .2s; }
.toc-part-toggle:hover .toc-chev { color: var(--ember); }
.toc-part-box.open .toc-chev { transform: rotate(180deg); color: var(--ember); }
.toc-part-desc {
  padding: 0 1.2rem 1.1rem; color: var(--ink-soft); cursor: pointer;
  font-family: var(--body); font-style: italic; font-size: 1rem; line-height: 1.7;
}
.toc-part-list { display: none; padding: 0.2rem 0.7rem 0.7rem; }
.toc-part-box.open .toc-part-desc { display: none; }
.toc-part-box.open .toc-part-list { display: block; }
.toc-item {
  display: grid; grid-template-columns: 2.6rem 1fr; align-items: baseline;
  gap: 0.6rem; width: 100%; text-align: left; background: none; border: 0;
  color: var(--ink-soft); font-family: var(--body); font-size: 1.08rem;
  padding: 0.5rem 0.4rem; cursor: pointer; border-radius: 2px;
  transition: color .2s, background .2s;
}
.toc-item:hover { color: var(--ink); background: rgba(255,255,255,0.03); }
.toc-item.current { color: var(--ember); }
.toc-item .ix { font-family: var(--display); font-variant-numeric: tabular-nums; color: var(--ash); }
.toc-item.current .ix { color: var(--ember); }