/* ===============================
   BOOK MODE — DESKTOP (CLEAN)
   =============================== */

header.site-header {
  position: relative;
  z-index: 100;
}

.open-story-page.book-mode {
  overflow: visible; /* background can breathe */
}

/* Hide cover in book mode */
.open-story-page.book-mode .story-cover {
  display: none;
}

/* ===============================
   BOOK PAGE
   =============================== */

.open-story-page.book-mode .book-page {
  max-width: 52ch;
  height: 72vh;

  margin: 3rem auto;
  padding: 2.25rem 2.25rem 1.75rem;

  background: #111;
  border: 1px solid #333;

  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,0.03),
    0 8px 24px rgba(0,0,0,0.6);

  display: flex;
  flex-direction: column;

  overflow: hidden; /* no scroll */
}

.book-page .chapter-heading {
  margin-top: 0;
}

/* ===============================
   FOOTER NAV (INSIDE PAGE)
   =============================== */

.page-footer {
  margin-top: auto;           /* pin to bottom */
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;

  font-size: 0.8rem;
  opacity: 0.65;
}

.page-footer button {
  background: none;
  border: none;
  color: #aaa;
  cursor: pointer;
  padding: 0;
}

.page-footer button:hover {
  color: #fff;
  text-decoration: underline;
}

/* ===============================
   PAGE TURN UI
   =============================== */

/* hide by default */
.page-zones,
.page-arrows {
  display: none;
}

/* show only in book mode */
.open-story-page.book-mode .page-zones,
.open-story-page.book-mode .page-arrows {
  display: flex;
}

/* Arrows: visual only */
.open-story-page.book-mode .page-arrows {
  position: fixed;
  top: 50%;
  left: 0;
  right: 0;

  justify-content: space-between;
  padding: 0 1.5rem;

  pointer-events: none;
  transform: translateY(-50%);
  z-index: 20;
}

.open-story-page.book-mode .page-arrows .arrow {
  font-size: 2.2rem;
  color: rgba(255,255,255,0.65);
  font-family: serif;
}

/* Click zones: these are what actually turn pages */
.open-story-page.book-mode .page-zones {
  position: fixed;
  top: var(--header-offset, 64px);
  left: 0;
  right: 0;
  bottom: 0;

  z-index: 15;
  pointer-events: none; /* children handle clicks */
}

.open-story-page.book-mode .page-zones .zone {
  position: absolute;
  top: 0;
  width: 33.333%;
  height: 100%;
  pointer-events: auto;
}

.open-story-page.book-mode .page-zones .zone.left { left: 0; }
.open-story-page.book-mode .page-zones .zone.right { right: 0; }

/* Ensure page turn zones sit ABOVE the book page */
.open-story-page.book-mode .page-zones {
  z-index: 50;          /* higher than book-page */
  pointer-events: auto;
}

.open-story-page.book-mode .book-page {
  position: relative;
  z-index: 10;          /* below zones */
}